EL PASO ENERGY PARTNERS LP
10-Q, 2000-05-12
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>   1

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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                             ---------------------

                                   FORM 10-Q

(MARK ONE)

[X]             QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)
                    OF THE SECURITIES EXCHANGE ACT OF 1934

                 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2000

                                       OR

[  ]            TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

                  FOR THE TRANSITION PERIOD FROM           TO

                          COMMISSION FILE NO. 1-11680

                         EL PASO ENERGY PARTNERS, L.P.
             (Exact Name of Registrant as Specified in its Charter)

<TABLE>
<S>                                            <C>
                   DELAWARE                                      76-0396023
         (State or Other Jurisdiction                         (I.R.S. Employer
      of Incorporation or Organization)                     Identification No.)

           EL PASO ENERGY BUILDING
            1001 LOUISIANA STREET
                HOUSTON, TEXAS                                     77002
   (Address of Principal Executive Offices)                      (Zip Code)
</TABLE>

       Registrant's Telephone Number, Including Area Code: (713) 420-2131

     Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.  Yes [X]  No [ ]

     The registrant had 26,739,065 common units and 289,699 preference units
outstanding as of May 10, 2000.

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<PAGE>   2

                        PART I -- FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

                         EL PASO ENERGY PARTNERS, L.P.

                  CONDENSED CONSOLIDATED STATEMENTS OF INCOME
                    (IN THOUSANDS, EXCEPT PER UNIT AMOUNTS)
                                  (UNAUDITED)

<TABLE>
<CAPTION>
                                                              FIRST QUARTER ENDED
                                                                   MARCH 31,
                                                              --------------------
                                                                2000       1999
                                                              --------   ---------
<S>                                                           <C>        <C>
Operating revenues
  Gathering, transportation, and platform services..........  $13,158    $  4,373
  Oil and natural gas sales.................................    5,792       6,805
  Equity investment earnings................................    3,850      10,701
                                                              -------    --------
                                                               22,800      21,879
                                                              -------    --------
Operating expenses
  Cost of sales.............................................    1,072         610
  Operation and maintenance, net............................    2,008       5,114
  Depreciation, depletion, and amortization.................    6,476       6,719
                                                              -------    --------
                                                                9,556      12,443
                                                              -------    --------
Operating income............................................   13,244       9,436
Other income, net...........................................       82         103
                                                              -------    --------
Income before interest, income taxes, and other charges.....   13,326       9,539
                                                              -------    --------
Interest and debt expense...................................   11,380       6,102
Income tax benefit..........................................       (3)        (99)
Minority interest...........................................       10          37
                                                              -------    --------
                                                               11,387       6,040
                                                              -------    --------
Net income..................................................    1,939       3,499
Net income allocated to general partner.....................    3,232       2,838
                                                              -------    --------
Net income (loss) allocated to limited partners before
  accounting change.........................................   (1,293)        661
Cumulative effect of accounting change......................       --     (15,427)
                                                              -------    --------
Net loss allocated to limited partners......................  $(1,293)   $(14,766)
                                                              =======    ========
Basic and diluted net income (loss) per unit before
  accounting change.........................................  $ (0.05)   $   0.03
Cumulative effect of accounting change......................       --       (0.60)
                                                              -------    --------
Basic and diluted net loss per unit.........................  $ (0.05)   $  (0.57)
                                                              =======    ========
Weighted average number of units outstanding................   27,029      24,367
                                                              =======    ========
</TABLE>

                            See accompanying notes.

                                        1
<PAGE>   3

                         EL PASO ENERGY PARTNERS, L.P.

                     CONDENSED CONSOLIDATED BALANCE SHEETS
                                 (IN THOUSANDS)
                                  (UNAUDITED)

                                     ASSETS

<TABLE>
<CAPTION>
                                                              MARCH 31,    DECEMBER 31,
                                                                 2000          1999
                                                              ----------   ------------
<S>                                                           <C>          <C>
Current assets
  Cash and cash equivalents.................................   $  8,146      $  4,202
  Accounts receivable.......................................      9,691         8,501
  Other current assets......................................         61           254
                                                               --------      --------
          Total current assets..............................     17,898        12,957
Property, plant, and equipment, net.........................    397,951       373,759
Investments in unconsolidated affiliates....................    183,891       185,766
Other noncurrent assets.....................................     10,948        11,103
                                                               --------      --------
          Total assets......................................   $610,688      $583,585
                                                               ========      ========

                           LIABILITIES AND PARTNERS' CAPITAL

Current liabilities
  Accounts payable..........................................   $ 15,849      $ 10,418

Notes payable...............................................    327,000       290,000
Long-term debt..............................................    175,000       175,000
Other noncurrent liabilities................................     12,539        12,164
                                                               --------      --------
          Total liabilities.................................    530,388       487,582
                                                               --------      --------
Commitments and contingencies
Minority interest...........................................       (654)         (486)
Partners' capital
  Limited partners
     Preference units; 289,699 units issued and
      outstanding...........................................      2,984         2,969
     Common units; 26,739,065 units issued and
      outstanding...........................................     77,851        93,277
  General partner...........................................        119           243
                                                               --------      --------
          Total partners' capital...........................     80,954        96,489
                                                               --------      --------
          Total liabilities and partners' capital...........   $610,688      $583,585
                                                               ========      ========
</TABLE>

                            See accompanying notes.

                                        2
<PAGE>   4

                         EL PASO ENERGY PARTNERS, L.P.

                CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (IN THOUSANDS)
                                  (UNAUDITED)

<TABLE>
<CAPTION>
                                                              FIRST QUARTER ENDED
                                                                   MARCH 31,
                                                              -------------------
                                                                2000       1999
                                                              --------   --------
<S>                                                           <C>        <C>
Cash flows from operating activities
  Net income................................................  $  1,939   $  3,499
  Adjustments to reconcile net income to net cash from
     operating activities
     Depreciation, depletion, and amortization..............     6,476      6,719
     Distributed earnings of equity investees
       Earnings from equity investments.....................    (3,850)   (10,701)
       Distributions from equity investments................     8,740     10,090
  Other noncash items.......................................       701        279
  Working capital changes, net of non-cash transactions.....     6,447        130
                                                              --------   --------
          Net cash provided by operating activities.........    20,453     10,016
                                                              --------   --------
Cash flows from investing activities
  Additions to property, plant, and equipment...............    (6,086)    (5,619)
  Additions to investments in unconsolidated affiliates.....    (3,015)      (873)
  Cash paid for acquisitions, net of cash acquired..........   (26,476)        --
  Other.....................................................      (280)      (365)
                                                              --------   --------
          Net cash used in investing activities.............   (35,857)    (6,857)
                                                              --------   --------
Cash flows from financing activities
  Revolving credit borrowings, less issue costs.............    43,000     20,732
  Revolving credit repayments...............................    (6,000)    (5,000)
  Distributions to partners.................................   (17,652)   (15,628)
                                                              --------   --------
          Net cash provided by financing activities.........    19,348        104
                                                              --------   --------
Increase in cash and cash equivalents.......................     3,944      3,263
Cash and cash equivalents
  Beginning of period.......................................     4,202      3,108
                                                              --------   --------
  End of period.............................................  $  8,146   $  6,371
                                                              ========   ========
</TABLE>

                            See accompanying notes.

                                        3
<PAGE>   5

                         EL PASO ENERGY PARTNERS, L.P.

              NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
                                  (UNAUDITED)

1. BASIS OF PRESENTATION

     Our 1999 Annual Report on Form 10-K includes a summary of our significant
accounting policies and other disclosures. You should read it in conjunction
with this Quarterly Report on Form 10-Q. The condensed consolidated financial
statements at March 31, 2000, and for the quarters ended March 31, 2000 and
1999, are unaudited. The condensed consolidated balance sheet at December 31,
1999, is derived from the audited financial statements. These financial
statements do not include all disclosures required by generally accepted
accounting principles, but have been prepared pursuant to the rules and
regulations of the U.S. Securities and Exchange Commission. In our opinion, all
material adjustments, all of which are of a normal, recurring nature, have been
made to fairly present our results of operations. Information for any interim
period may not necessarily indicate the results of operations for the entire
year due to the seasonal nature of our businesses. The prior period information
includes reclassifications which were made to conform to the current
presentation. These reclassifications have no effect on our reported net income,
cash flows or partners' capital.

  Cumulative Effect of Accounting Change

     In 1999, we changed our method of allocating net income to our partners'
capital accounts from a method where income was allocated based on percentage
ownership and proportionate share of cash distributions, to a method whereby
income is allocated to the partners based upon the change from period to period
in their respective claims on our book value capital. We believe that the new
income allocation method is preferable because it more accurately reflects the
income allocation provisions called for under the partnership agreement and the
resulting partners' capital accounts are more reflective of a partner's claim on
our book value capital at each period end. This change in accounting had no
impact on our consolidated net income (loss) or our consolidated total partners'
capital for any period presented. Furthermore, the change is not expected to
impact the declaration of future cash distributions or affect an individual
partner's tax basis in the partnership. The impact of this change in accounting
has been recorded as a cumulative effect of an accounting change in our income
allocation for the quarter ended March 31, 1999.

2. ACQUISITIONS

     In March 2000, we acquired the El Paso Intrastate-Alabama pipeline system,
or EPIA, from a subsidiary of El Paso Energy Corporation for $26.5 million. We
accounted for the acquisition as a purchase and assigned the purchase price to
the assets and liabilities acquired based upon the estimated fair value of those
assets and liabilities as of the acquisition date. The values assigned are
preliminary and may be revised. The following is summary information related to
the acquisition (in thousands):

<TABLE>
<S>                                                      <C>
Fair value of assets acquired..........................     $ 28,261
Fair value of liabilities assumed......................       (1,785)
                                                            --------
          Net cash paid................................     $ 26,476
                                                            ========
</TABLE>

                                        4
<PAGE>   6
                         EL PASO ENERGY PARTNERS, L.P.

      NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

     The following information represents our consolidated results of operations
on a pro forma basis for the three month periods ended March 31, 2000 and 1999,
as if we acquired EPIA on January 1, 1999:

<TABLE>
<CAPTION>
                                                               FIRST QUARTER ENDED
                                                                    MARCH 31,
                                                              ----------------------
                                                                2000          1999
                                                              --------      --------
                                                              (IN THOUSANDS, EXCEPT
                                                                PER UNIT AMOUNTS)
<S>                                                           <C>           <C>
Operating revenues..........................................  $31,283       $29,082
Operating income............................................  $14,188       $10,249
Net income..................................................  $ 2,322       $ 3,789
Basic and diluted net income (loss) per unit before
  accounting change.........................................  $ (0.03)      $  0.04
</TABLE>

3. PARTNERS' CAPITAL

  Cash distributions

     In February 2000, we paid cash distributions of $0.275 per preference unit
and $0.525 per common unit and our General Partner received incentive
distributions of $3.2 million. In April 2000, we declared a cash distribution of
$0.275 per preference unit and $0.5375 per common unit for the quarter ended
March 31, 2000, which we will pay on May 15, 2000, to holders of record as of
April 28, 2000. In addition, we will pay our General Partner $3.6 million in
incentive distributions. At the current distribution rates, our General Partner
receives approximately 20 percent of total cash distributions we pay.

4. PROPERTY, PLANT, AND EQUIPMENT

     Our property, plant, and equipment consisted of the following:

<TABLE>
<CAPTION>
                                                              MARCH 31,   DECEMBER 31,
                                                                2000          1999
                                                              ---------   ------------
                                                                   (IN THOUSANDS)
<S>                                                           <C>         <C>
Property, plant, and equipment, at cost
  Pipelines.................................................  $245,393      $220,816
  Platforms and facilities..................................   143,446       137,537
  Oil and natural gas properties............................   155,968       155,968
                                                              --------      --------
                                                               544,807       514,321
Less accumulated depreciation, depletion, and
  amortization..............................................   146,856       140,562
                                                              --------      --------
     Property, plant, and equipment, net....................  $397,951      $373,759
                                                              ========      ========
</TABLE>

5. DEBT AND OTHER CREDIT FACILITIES

  Partnership Credit Facility

     We have a revolving credit facility with a syndicate of commercial banks to
provide up to $375 million of available credit. As of March 31, 2000, we had
$327 million outstanding under this facility and $48 million available. The
average interest rate was 8.5 percent at March 31, 2000. We pay a commitment fee
of 0.25 percent per annum on the unused and unavailable portion of the credit
facility and 0.50 percent per annum on the unused and available portion.

                                        5
<PAGE>   7
                         EL PASO ENERGY PARTNERS, L.P.

      NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

 Other Credit Facilities

     Deepwater Holdings, L.L.C. and Poseidon Oil Pipeline Company, L.L.C. are
parties to credit agreements under which each has outstanding obligations that
may restrict their ability to pay distributions to their respective owners.

     Deepwater Holdings has a revolving credit facility with a syndicate of
commercial banks to provide up to $175 million. As of March 31, 2000, Deepwater
Holdings had $147 million outstanding under its credit facility at an average
floating interest rate of 7.2 percent and had no additional availability under
its borrowing base limitations.

     Poseidon has a revolving credit facility with a syndicate of commercial
banks to provide up to $150 million. As of March 31, 2000, Poseidon had $150
million outstanding under its facility at an average floating interest rate of
7.4 percent.

6. COMMITMENTS AND CONTINGENCIES

  Hedging Activities

     At March 31, 2000, we had three oil and natural gas sales swaps covering a
portion of our production for the calendar year 2000. For the three months ended
March 31, 2000 and 1999, we recorded a net loss of $1.0 million and $0.4
million, respectively, on these contracts. Had we settled our open hedging
positions as of March 31, 2000, based on the applicable settlement prices of the
NYMEX futures contracts, we would have recognized losses of approximately $0.1
million related to our oil swap and $6.6 million related to our natural gas
swaps.

  Legal Proceedings

     We are a named defendant in a lawsuit filed by Transcontinental Gas
Pipeline Company. Transco alleges that it had the right, under a platform lease
agreement with us, to expand its facilities and operations on the offshore
platform by connecting additional pipeline receiving and appurtenant facilities.
We denied Transco's request to expand its facilities and operations because we
do not believe the lease agreement provides for such expansion, and because
Transco's activities would have interfered with the Manta Ray Offshore system
and our existing and planned activities on that platform. The case went to trial
on April 3, 2000, and the jury found that we were not at fault and therefore
awarded no damages to Transco. The final order is pending before the judge in
the case.

     In January 2000, an anchor from a submersible drilling rig in tow damaged a
section of the Poseidon system north of our Ship Shoal 332 platform. The
accident resulted in the release of approximately 2,200 barrels of crude oil in
the waters surrounding the system, caused damage to our platform, and resulted
in initial shutdown of the system and certain surrounding facilities in which we
have ownership interests and substantially limited throughput for 68 days.
Poseidon estimates the cost to repair the damaged pipeline and clean up the
crude oil released into the Gulf is approximately $17 million, and has placed
the rig's owner on notice for liability and expenses due to the incident. The
pipeline has been repaired and throughput has returned to normal levels.

                                        6
<PAGE>   8
                         EL PASO ENERGY PARTNERS, L.P.

      NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

     We have been named as a defendant in actions brought by Jack Grynberg on
behalf of the U.S. Government under the False Claims Act. Generally, these
complaints allege an industry-wide conspiracy to underreport the heating value
as well as the volumes of the natural gas produced from federal and Indian
lands, which deprived the U.S. Government of royalties. We have also been named
as a defendant in a similar class action suit, Quinque Operating Company v. Gas
Pipelines. This complaint alleges that the defendants mismeasured natural gas
volumes and heating content of natural gas on non-federal and non-Native
American lands. The Quinque complaint was transferred to the same court handling
the Grynberg complaint. We believe both complaints are without merit.

     We are also a named defendant in numerous lawsuits and a named party in
numerous governmental proceedings arising in the ordinary course of our
business.

     While the outcome of the matters discussed above cannot be predicted with
certainty, we do not expect the ultimate resolution of these matters to have a
material adverse effect on our financial position, results of operations, or
cash flows.

  Environmental

     We are subject to extensive federal, state, and local laws and regulations
governing environmental quality and pollution control. These laws and
regulations require us to remove or remedy the effect on the environment of the
disposal or release of specified substances at current and former operating
sites.

     It is possible that new information or future developments could require us
to reassess our potential exposure to environmental matters. We may incur
significant costs and liabilities in order to comply with existing environmental
laws and regulations. It is also possible that other developments, such as
increasingly strict environmental laws, regulations and enforcement policies
thereunder, and claims for damages to property, employees, other persons and the
environment resulting from current or discontinued operations, could result in
substantial costs and liabilities in the future. As new information becomes
available, or other developments occur, we will make accruals accordingly.

                                        7
<PAGE>   9
                         EL PASO ENERGY PARTNERS, L.P.

      NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

7. SEGMENT INFORMATION

     We segregate our business activities into two segments: Gathering,
Transportation, and Platform Services and Oil and Natural Gas Production. These
segments are strategic business units that offer different services and
products. They are managed separately, as each requires different technology and
marketing strategies. We measure segment performance based on performance cash
flow, or an asset's or investment's ability to generate cash flow. We determine
performance cash flow by taking earnings before interest, taxes, and
depreciation, depletion, and amortization, and adding or subtracting as
appropriate, cash distributions from equity investments, earnings attributable
to equity investments, and other non-cash items. We use this measure as a
supplemental financial measurement in the evaluation of our business, and you
should not consider it an alternative to earnings before interest and taxes, or
EBIT, as an indicator of our operating performance or to cash flows from
operating activities as a measure of our liquidity. In addition, it may not be a
comparable measurement among different companies. Performance cash flows are
presented here to provide you with additional information about our assets and
investments. The accounting policies of the individual segments are the same as
ours. The following table summarizes certain financial information for our
business segments:

<TABLE>
<CAPTION>
                                                 GATHERING,
                                               TRANSPORTATION     OIL AND
                                                AND PLATFORM    NATURAL GAS   INTERSEGMENT
                                                  SERVICES      PRODUCTION    ELIMINATIONS   OTHER(1)    TOTAL
                                               --------------   -----------   ------------   --------   --------
                                                                   (IN THOUSANDS)
<S>                                            <C>              <C>           <C>            <C>        <C>
QUARTER ENDED MARCH 31, 2000:
  Revenue from external customers............     $ 13,158       $  5,792       $     --     $    --    $ 18,950
  Intersegment revenue.......................        3,166             --         (3,166)         --
  Earnings from equity investments...........        3,850             --             --          --       3,850
  Operation and maintenance expense, net.....        1,278          3,896         (3,166)         --       2,008
  Depreciation, depletion, and
    amortization.............................        3,361          3,060             --          55       6,476
  Operating income (loss)....................       14,593         (1,294)            --         (55)     13,244
  EBIT.......................................       14,594         (1,294)            --          26      13,326
  Performance cash flows.....................       22,844          1,402             --          82      24,328
  Assets.....................................      526,513         65,038             --      19,137     610,688
QUARTER ENDED MARCH 31, 1999:
  Revenue from external customers............     $  4,373       $  6,805       $     --     $    --    $ 11,178
  Intersegment revenue.......................        2,874             --         (2,874)         --          --
  Earnings from equity investments...........       10,701             --             --          --      10,701
  Operation and maintenance expense, net.....        3,726          4,262         (2,874)         --       5,114
  Depreciation, depletion, and
    amortization.............................        1,916          4,799             --           4       6,719
  Operating income (loss)....................       12,306         (2,866)            --          (4)      9,436
  EBIT.......................................       12,373         (2,866)            --          32       9,539
  Performance cash flows.....................       13,678          2,297             --          36      16,011
  Assets.....................................      351,275         81,349             --      10,616     443,240
</TABLE>

- ---------------------

(1) Other represents income or assets not associated with our segment
    activities.

                                        8
<PAGE>   10
                         EL PASO ENERGY PARTNERS, L.P.

      NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

8. INVESTMENTS IN UNCONSOLIDATED AFFILIATES

     We hold investments in various affiliates which we account for using the
equity method of accounting. Summarized financial information for these
investments is as follows:

                              FIRST QUARTER ENDED
                                 MARCH 31, 2000
                                 (IN THOUSANDS)

<TABLE>
<CAPTION>
                                              MANTA
                                               RAY                      DEEPWATER
                                           OFFSHORE(A)   NAUTILUS(A)   HOLDINGS(B)   POSEIDON   TOTAL
                                           -----------   -----------   -----------   --------   ------
<S>                                        <C>           <C>           <C>           <C>        <C>
OWNERSHIP INTEREST.......................     25.67%         25.67%           50%         36%
                                             ======        =======       =======     =======
OPERATING RESULTS DATA:
  Operating revenues.....................    $4,625        $ 2,702       $15,086     $11,130
  Other income (expense).................       707             (2)           87         195
  Operating expenses.....................      (852)          (603)       (8,354)     (1,678)
  Depreciation...........................      (800)        (1,475)       (4,039)     (1,941)
  Other expenses.........................       (18)           (90)       (1,494)     (2,827)
                                             ------        -------       -------     -------
  Net income.............................    $3,662        $   532       $ 1,286     $ 4,879
                                             ======        =======       =======     =======
OUR SHARE:
  Allocated income.......................    $  940        $   137       $   643     $ 1,756
  Adjustments(c).........................        57             --           903        (586)
                                             ------        -------       -------     -------
  Earnings from equity investments.......    $  997        $   137       $ 1,546     $ 1,170    $3,850
                                             ======        =======       =======     =======    ======
  Allocated distributions................    $1,562        $   638       $ 5,100     $ 1,440    $8,740
                                             ======        =======       =======     =======    ======
</TABLE>

- ---------------

(a) We own indirect investments in Manta Ray Offshore Gathering Company, L.L.C.
    and Nautilus Pipeline Company, L.L.C. However, because we believe separate
    data on each of these investees is more meaningful, results have been
    reflected separately.
(b) Deepwater Holdings was formed in September 1999 and owns 100 percent of High
    Island Offshore System, L.L.C., East Breaks Gathering Company, L.L.C., U-T
    Offshore System, L.L.C., Stingray Pipeline Company, L.L.C., and West Cameron
    Dehydration Company, L.L.C.
(c) We recorded adjustments primarily for differences from estimated year end
    1999 earnings reported in our Annual Report on Form 10-K and actual earnings
    reported in the 1999 audited annual reports of our unconsolidated
    affiliates, and for purchase price adjustments under Accounting Principles
    Board (APB) Opinion No. 16, "Business Combinations."

                                        9
<PAGE>   11
                         EL PASO ENERGY PARTNERS, L.P.

      NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

                              FIRST QUARTER ENDED
                                 MARCH 31, 1999
                                 (IN THOUSANDS)

<TABLE>
<CAPTION>
                                MANTA                                                               WEST
                                 RAY                     VIOSCA                                    CAMERON
                             OFFSHORE(A)   NAUTILUS(A)    KNOLL    STINGRAY     HIOS      UTOS      DEHY     POSEIDON     TOTAL
                             -----------   -----------   -------   --------   --------   -------   -------   ---------   -------
<S>                          <C>           <C>           <C>       <C>        <C>        <C>       <C>       <C>         <C>
OWNERSHIP INTEREST..........     25.67%        25.67%         50%        50%        40%     33.3%      50%          36%
                               =======       =======     =======   ========   ========   =======   ======    =========
OPERATING RESULTS DATA:
  Operating revenue.........   $ 3,446       $ 2,051     $ 7,361   $  4,432   $ 10,006   $   993   $  831    $  16,778
  Other income (expense)....       764          (234)         16        600         58        19        6          118
  Operating expenses........    (1,040)         (501)       (270)    (3,158)    (3,858)     (452)     (75)      (1,671)
  Depreciation..............    (1,221)       (1,479)       (950)    (1,901)    (1,091)     (140)      (4)      (1,911)
  Interest expense..........        --            --      (1,125)        --         --        --       (8)      (2,116)
                               -------       -------     -------   --------   --------   -------   ------    ---------
  Net income (loss).........   $ 1,949       $  (163)    $ 5,032   $    (27)  $  5,115   $   420   $  750    $  11,198
                               =======       =======     =======   ========   ========   =======   ======    =========
OUR SHARE:
  Allocated income (loss)...   $   500       $   (42)    $ 2,516   $    (14)  $  2,046   $   140   $  375    $   4,031
  Adjustments(b)............       (87)          (58)         --      1,112        185        27       --          (30)
                               -------       -------     -------   --------   --------   -------   ------    ---------
  Earnings (loss) from
    equity investments......   $   413       $  (100)    $ 2,516   $  1,098   $  2,231   $   167   $  375    $   4,001   $10,701
                               =======       =======     =======   ========   ========   =======   ======    =========   =======
  Allocated distributions...   $ 1,366       $   527     $ 3,350   $     --   $  1,600   $   333   $  275    $   2,639   $10,090
                               =======       =======     =======   ========   ========   =======   ======    =========   =======
</TABLE>

- ---------------

(a) We own indirect investments in these investees. However, because we believe
    separate data for each of these investees is more meaningful, results have
    been reflected separately.
(b) We recorded adjustments primarily for differences from estimated year end
    1998 earnings reported in our Annual Report on Form 10-K and actual earnings
    reported in the 1998 audited annual reports of our unconsolidated
    affiliates, and for purchase price adjustments under APB Opinion No. 16,
    except for Stingray which resulted from changes in estimates of reserves for
    uncollectible revenues.

9. RELATED PARTY TRANSACTIONS

     Our transactions with related parties and affiliates are as follows:

<TABLE>
<CAPTION>
                                                               FIRST QUARTER
                                                              ENDED MARCH 31,
                                                              ---------------
                                                               2000     1999
                                                              ------   ------
                                                              (IN THOUSANDS)
<S>                                                           <C>      <C>
Revenues received from related parties:
  Oil and natural gas sales.................................  $5,696   $6,769
  Gathering, transportation and platform services...........      --      595
                                                              ------   ------
                                                              $5,696   $7,364
                                                              ======   ======
Expenses paid to related parties:
  Operating expenses(1).....................................  $4,529   $3,586
                                                              ======   ======
Reimbursements received from related parties:
  Operating expenses........................................  $5,021   $  188
                                                              ======   ======
</TABLE>

- ---------------

(1) Included in these amounts are charges from El Paso Field Services of
    approximately $0.7 million and $0.5 million for other miscellaneous costs
    for the three month periods ended March 31, 2000 and March 31, 1999,
    respectively.

     There have been no changes to our related party relationships, except as
described below, from our 1999 Annual Report on Form 10-K.

                                       10
<PAGE>   12
                         EL PASO ENERGY PARTNERS, L.P.

      NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

     As a result of assuming the operations of Deepwater Holdings' assets, we
began receiving a reimbursement from Deepwater Holdings for the operation of
HIOS, UTOS, East Breaks, Stingray, and West Cameron Dehy. This reimbursement is
a fixed monthly amount covering normal operating activities and is recorded as a
reduction to our operation and maintenance expense. To the extent our costs are
more than the monthly reimbursement our operating expenses will be higher and to
the extent our costs are lower than the monthly reimbursement our operating
expense will be lower. In addition, due to the timing of actual costs, we may
recognize fluctuations in our results of operations throughout the year.

     In November 1999, we entered into an agreement with El Paso Field Services
whereby, for a fee approximating actual costs, Field Services began providing
field personnel to operate Stingray and West
Cameron Dehy and, in February 2000, began operating HIOS, UTOS and East Breaks.
On March 21, 2000, we entered into a similar agreement whereby Field Services
will operate EPIA for a fee representing historical cost levels.

     In October 1999, we farmed out our working interest in the Ewing Bank 958
Unit to El Paso Production Company, a subsidiary of El Paso Energy. Under the
terms of the farmout agreement, our overriding royalty interest in the Ewing
Bank 958 Unit increased to a weighted average of approximately 9 percent. If El
Paso Production recoups the costs associated with its drilling and completion
activities on the unit, we can convert our royalty interest into a 30 percent
undivided working interest. El Paso Production began drilling on the Ewing Bank
958 Unit in November 1999 and encountered over 200 feet of net hydrocarbon pay.
As a result, El Paso Production contracted with us to build the TLP described
below.

     In July 1999, we entered into a contract with MODEC International, L.L.C.
for the design, construction, fabrication and installation of the hull, tendons,
pilings and production risers for a tension-leg platform, or TLP, to be used as
part of the Ewing Bank 958 Unit development. Upon the farm out of the Ewing Bank
958 Unit to El Paso Production, we suspended the construction of the TLP. In May
2000, we entered into a letter of intent with El Paso Production to install and
own the TLP. The platform is anticipated to be delivered in April 2001 with
first production anticipated to commence in June 2001.

10. NEW ACCOUNTING PRONOUNCEMENTS NOT YET ADOPTED

  Accounting for Derivative Instruments and Hedging Activities

     In June 1998, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards No. 133, Accounting for Derivative Instruments
and Hedging Activities, to establish accounting and reporting standards for
derivative instruments, including derivative instruments embedded in other
contracts, and for hedging activities. This pronouncement requires us to
classify derivatives as either assets or liabilities on the balance sheet and
measure those instruments at fair value. If certain conditions are met, we may
specifically designate a derivative as a hedge of:

     - the exposure to changes in the fair value of a recognized asset or
       liability or an unrecognized firm commitment,

     - the exposure to variable cash flows of a forecasted transaction, or

     - the foreign currency exposure of a net investment in a foreign operation,
       an unrecognized firm commitment, an available-for-sale security, or a
       foreign-currency-denominated forecasted transaction.

     The accounting for the changes in the fair value of a derivative depends on
the intended use of the derivative and the resulting designation. Statement of
Financial Accounting Standards No. 137 amended the standard in June 1999. The
amendment defers the effective date to fiscal years beginning after June 15,
2000. We are currently evaluating the effects of this pronouncement.

                                       11
<PAGE>   13

ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
OF OPERATIONS

     The information contained in Item 2 updates, and you should read it in
conjunction with, information disclosed in Part II, Items 7, 7A and 8, in our
Annual Report on Form 10-K for the year ended December 31, 1999, in addition to
the interim financial statements and notes presented in Item 1 of this Quarterly
Report on Form 10-Q.

                              RECENT DEVELOPMENTS

     In May 2000, we notified the holders of our remaining 289,699 preference
units of the beginning of their final opportunity to convert their preference
units into common units in accordance with our partnership agreement. After this
third and final conversion opportunity expires, we have the right and intend to
redeem all remaining preference units for no more than $10.25 (subject to
certain downward adjustments) per unit. This redemption price is below the
closing price of preference units of $22.13 on May 5, 2000. Further, following
this final conversion period, the preference units may no longer meet New York
Stock Exchange minimum listing requirements and may be delisted.

     In March 2000, we acquired EPIA from a subsidiary of El Paso Energy for
$26.5 million. EPIA is a natural gas gathering system in the coal seam producing
regions of Alabama. This acquisition represents our first purchase of an onshore
system.

     In January 2000, an anchor from a submersible drilling rig in tow damaged a
section of the Poseidon system north of our Ship Shoal 332 platform. The
accident resulted in the release of approximately 2,200 barrels of crude oil in
the waters surrounding the system, caused damage to our platform, and resulted
in initial shutdown of the system and certain surrounding facilities in which we
have ownership interests for 68 days. Poseidon estimates the cost to repair the
damaged pipeline and clean up of the crude oil released into the Gulf is
approximately $17 million, and has placed the rig's owner on notice for
liability and expenses due to the incident. Our earnings relating to Poseidon
for the first quarter of 2000 were substantially lower than expected as a result
of this accident. The pipeline has been repaired and throughput has returned to
normal levels.

                             RESULTS OF OPERATIONS

     For the quarter ended March 31, 2000, our net income was $1.9 million
versus $3.5 million for the quarter ended March 31, 1999. First quarter 2000
results included earnings from the newly installed Allegheny oil pipeline,
higher contribution from the Viosca Knoll gathering system, and lower net
operating costs primarily attributed to lower operating costs incurred as a
result of consolidating and integrating pipeline operations in the western Gulf
region relative to cost recoveries under our operating agreement with Deepwater
Holdings, offset by lower earnings from Poseidon as a result of the pipeline
rupture. EBIT was $13.3 million for the first quarter of 2000 versus $9.5
million for the first quarter of 1999. A more detailed analysis of our segment
results and non-operating expenses is discussed below.

                                       12
<PAGE>   14

                                SEGMENT RESULTS

     The following table presents EBIT by segment and in total for each of the
three months ended March 31:

<TABLE>
<CAPTION>
                                                               2000         1999
                                                              -------      -------
                                                                 (IN THOUSANDS)
<S>                                                           <C>          <C>
EARNINGS BEFORE INTEREST EXPENSE AND INCOME TAXES
Gathering, transportation, and platform services............  $14,594      $12,373
Oil and natural gas production..............................   (1,294)      (2,866)
                                                              -------      -------
  Segment EBIT..............................................   13,300        9,507
Non-segment activity, net...................................       26           32
                                                              -------      -------
  Consolidated EBIT.........................................  $13,326      $ 9,539
                                                              =======      =======
</TABLE>

  EBIT variances are discussed in the segment results below.

GATHERING, TRANSPORTATION, AND PLATFORM SERVICES

<TABLE>
<CAPTION>
                                                              FIRST QUARTER ENDED
                                                                   MARCH 31,
                                                              --------------------
                                                               2000         1999
                                                              -------      -------
                                                                 (IN THOUSANDS)
<S>                                                           <C>          <C>
Gathering and transportation................................  $10,305      $ 1,262
Platform services...........................................    6,019        5,985
Equity investment earnings..................................    3,850       10,701
                                                              -------      -------
  Total operating revenues..................................   20,174       17,948
Operating expenses, net.....................................   (5,581)      (5,642)
Other income................................................        1           67
                                                              -------      -------
  EBIT......................................................  $14,594      $12,373
                                                              =======      =======
</TABLE>

     Operating revenues for the three months ended March 31, 2000, were $2.2
million higher than for the same period in 1999 primarily as a result of the
purchase of an additional 49 percent interest in Viosca Knoll in June 1999 and
the Allegheny oil pipeline being placed in service in the fourth quarter of
1999, partially offset by lower equity in earnings from Poseidon as a result of
the pipeline rupture in January 2000.

     Operating expenses for the three months ended March 31, 2000, were
approximately $0.1 million lower than in the same period in 1999 primarily as a
result of consolidating and integrating pipeline operations in the western Gulf
region relative to cost recoveries under our operating agreement with Deepwater
Holdings, partially offset by the consolidation of Viosca Knoll beginning in the
second quarter of 1999 and placing the Allegheny oil pipeline in service in the
fourth quarter of 1999.

                                       13
<PAGE>   15

OIL AND NATURAL GAS PRODUCTION

<TABLE>
<CAPTION>
                                                              FIRST QUARTER ENDED
                                                                   MARCH 31,
                                                              --------------------
                                                               2000         1999
                                                              -------      -------
                                                                 (IN THOUSANDS,
                                                                EXCEPT VOLUMES)
<S>                                                           <C>          <C>
Natural gas.................................................  $ 4,518      $ 5,767
Oil, condensate, and liquids................................    1,274        1,038
                                                              -------      -------
          Total operating revenues..........................    5,792        6,805
Operating expenses..........................................   (7,086)      (9,671)
Other income................................................       --           --
                                                              -------      -------
  EBIT......................................................  $(1,294)     $(2,866)
                                                              =======      =======
Volumes(1)
  Natural gas sales (MMcf)..................................    1,887        3,584
                                                              =======      =======
  Oil, condensate, and liquid sales (MBBls).................       59           99
                                                              =======      =======
Weighted average realized prices(1)
  Natural gas ($/Mcf).......................................  $  2.36      $  1.60
                                                              =======      =======
  Oil, condensate, and liquids ($/BBl)......................  $ 20.74      $ 10.46
                                                              =======      =======
</TABLE>

- ---------------

(1) As generally used in the energy industry and in this document, the following
    terms have the following meanings:

  MMcf = million cubic feet
  MBBls = thousand barrels
  Mcf   = thousand cubic feet
  BBl   = barrel

     Oil and natural gas sales for the three months ended March 31, 2000, were
$1.0 million lower when compared to the same period in 1999. The decrease is a
result of lower oil and natural gas production due to normal depletion of
existing reserves and the shut in of Garden Banks 72 and 117 as a result of the
Poseidon rupture, offset by higher realized prices of both oil and natural gas.

     Operating expenses for the three months ended March 31, 2000, were
approximately $2.6 million lower than in the same period in 1999 primarily as a
result of lower depletion due to lower oil and natural gas production.

INTEREST AND DEBT EXPENSE

     Interest and debt expense, net of capitalized interest, for the three
months ended March 31, 2000, was approximately $5.3 million higher than 1999,
due to higher average debt levels and interest rates in 2000.

                        LIQUIDITY AND CAPITAL RESOURCES

CASH FROM OPERATING ACTIVITIES

     Net cash provided by operating activities was approximately $20.5 million
for the three months ended March 31, 2000, compared to approximately $10.0
million for the same period in 1999. Cash from operations increased
approximately $5.5 million due to higher distributions from equity investments
in excess of equity earnings in the three months ended March 31, 2000 compared
to the same period of 1999, along with favorable working capital changes in the
2000 period.

                                       14
<PAGE>   16

CASH FROM INVESTING ACTIVITIES

     Net cash used in investing activities was approximately $35.9 million for
the three months ended March 31, 2000, due to our acquisition of EPIA and
additions to property, plant, and equipment along with additional expenditures
on equity investments.

     We expect that funding for capital expenditures, acquisitions, and other
investing expenditures will be provided by internally generated funds, available
capacity under existing credit facilities, and/or the issuance of other
long-term debt or equity.

CASH FROM FINANCING ACTIVITIES

     Net cash flows provided by financing activities totaled approximately $19.3
million for the three months ended March 31, 2000. During 2000, we increased the
amounts outstanding under our credit facility by $37.0 million and made
distributions to partners of $17.7 million.

     We expect that future funding for long-term debt retirements,
distributions, and other financing expenditures will be provided by internally
generated funds, available capacity under existing credit facilities, and/or the
issuance of other long-term debt or equity.

                         COMMITMENTS AND CONTINGENCIES

     See Note 6, which is incorporated herein by reference.

                                     OTHER

     In January 2000, El Paso Energy announced it had entered into an agreement
to merge with The Coastal Corporation. In May 2000, the shareholders of El Paso
Energy and Coastal approved the merger. Coastal is the parent Company of ANR
Pipeline Company, which is our joint venture partner in Deepwater Holdings. The
merger is subject to certain conditions, including receipt of certain required
government approvals. If the merger is completed, ANR will become our affiliate.

NEW ACCOUNTING PRONOUNCEMENTS NOT YET ADOPTED

     See Note 10, which is incorporated herein by reference.

                                       15
<PAGE>   17

                         CAUTIONARY STATEMENT REGARDING
                           FORWARD-LOOKING STATEMENTS

     We have made statements in this document that constitute forward-looking
statements, as that term is defined in the Private Securities Litigation Reform
Act of 1995. These statements are subject to risks and uncertainties.
Forward-looking statements include information concerning possible or assumed
future results of operations. These statements may relate to information or
assumptions about:

     - earnings per unit;

     - capital and other expenditures;

     - cash distributions;

     - financing plans;

     - capital structure;

     - cash flow;

     - pending legal proceedings and claims, including environmental matters;

     - future economic performance;

     - operating income;

     - cost savings;

     - management's plans; and

     - goals and objectives for future operations.

     Important factors that could cause actual results to differ materially from
estimates or projections contained in forward-looking statements include, among
others, the following:

     - the increasing competition within our industry;

     - the timing and extent of changes in commodity prices for natural gas and
       oil;

     - the uncertainties associated with customer contract expirations on our
       pipeline systems; and

     - the conditions of equity and other capital markets.

     These risk factors are more fully described in our other filings with the
Securities and Exchange Commission, including our Annual Report on Form 10-K for
the year ended December 31, 1999.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

     This information updates, and you should read it in conjunction with,
information disclosed in Part II, Item 7A in our Annual Report on Form 10-K for
the year ended December 31, 1999, in addition to the information presented in
Items 1 and 2 of this Quarterly Report on Form 10-Q.

     There are no material changes in market risks from those reported in our
Annual Report on Form 10-K for the year ended December 31, 1999.

                                       16
<PAGE>   18

                          PART II -- OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

     See Part I -- Financial Information, Note 6, which is incorporated herein
by reference.

ITEM 2. CHANGES IN SECURITIES AND USE OF PROCEEDS

     None.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

     None.

ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

     None.

ITEM 5. OTHER INFORMATION

     None.

ITEM 6. EXHIBITS AND REPORTS ON FORM 8-K

     (a) Exhibits

     Each exhibit identified below is filed as part of this quarterly report.

<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
          3.1            -- Certificate of Amendment to the Certificate of Limited
                            Partnership of El Paso Energy Partners, as filed with the
                            Delaware Secretary of State on
                            December 1, 1999.
          3.2            -- Amendment Number 3 to the Amended and Restated Agreement
                            of Limited Partnership of El Paso Energy Partners.
         10.14           -- Limited Liability Company Agreement for Poseidon Oil
                            Pipeline Company, L.L.C. dated February 14, 1996; First
                            Amendment to the Limited Liability Company Agreement for
                            Poseidon Oil Pipeline Company, L.L.C. dated February 14,
                            1996.
         10.15           -- Limited Liability Company Agreement of Neptune Pipeline
                            Company, L.L.C. dated January 17, 1997.
         10.16           -- Limited Liability Company Agreement of Ocean Breeze
                            Pipeline Company, L.L.C. dated January 17, 1997.
         10.17           -- Limited Liability Company Agreement of Nemo Gathering
                            Company, L.L.C. dated July 26, 1999.
         10.18           -- Limited Liability Company Agreement of Deepwater
                            Holdings, L.L.C. dated September 30, 1999.
         10.19           -- Purchase and Sale Agreement dated as of September 30,
                            1999 between Leviathan Deepwater, L.L.C. and ANR Western
                            Gulf Holdings, L.L.C.
         10.20           -- Fabrication Agreement dated as of July 16, 1999 by and
                            between Delos Offshore Company and MODEC International
                            LLC; Amendment No. 1 to the Fabrication Agreement dated
                            as of August 31, 1999 by and between Delos Offshore
                            Company and MODEC International LLC.
         27              -- Financial Data Schedule.
</TABLE>

     (b) Report on Form 8-K

     None.

                                       17
<PAGE>   19

                                   SIGNATURES

     Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.

                                          EL PASO ENERGY PARTNERS, L.P.

                                          By: EL PASO ENERGY PARTNERS COMPANY,
                                            its General Partner

Date: May 11, 2000                        By:      /s/ KEITH B. FORMAN
                                            ------------------------------------
                                                      Keith B. Forman
                                                  Chief Financial Officer

Date: May 11, 2000                        By:      /s/ D. MARK LELAND
                                            ------------------------------------
                                                       D. Mark Leland
                                               Vice President and Controller
                                               (Principal Accounting Officer)

                                       18
<PAGE>   20

                               INDEX TO EXHIBITS

<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
          3.1            -- Certificate of Amendment to the Certificate of Limited
                            Partnership of El Paso Energy Partners, as filed with the
                            Delaware Secretary of State on
                            December 1, 1999.
          3.2            -- Amendment Number 3 to the Amended and Restated Agreement
                            of Limited Partnership of El Paso Energy Partners.
         10.14           -- Limited Liability Company Agreement for Poseidon Oil
                            Pipeline Company, L.L.C. dated February 14, 1996; First
                            Amendment to the Limited Liability Company Agreement for
                            Poseidon Oil Pipeline Company, L.L.C. dated February 14,
                            1996.
         10.15           -- Limited Liability Company Agreement of Neptune Pipeline
                            Company, L.L.C. dated January 17, 1997.
         10.16           -- Limited Liability Company Agreement of Ocean Breeze
                            Pipeline Company, L.L.C. dated January 17, 1997.
         10.17           -- Limited Liability Company Agreement of Nemo Gathering
                            Company, L.L.C. dated July 26, 1999.
         10.18           -- Limited Liability Company Agreement of Deepwater
                            Holdings, L.L.C. dated September 30, 1999.
         10.19           -- Purchase and Sale Agreement dated as of September 30,
                            1999 between Leviathan Deepwater, L.L.C. and ANR Western
                            Gulf Holdings, L.L.C.
         10.20           -- Fabrication Agreement dated as of July 16, 1999 by and
                            between Delos Offshore Company and MODEC International
                            LLC; Amendment No. 1 to the Fabrication Agreement dated
                            as of August 31, 1999 by and between Delos Offshore
                            Company and MODEC International LLC.
         27              -- Financial Data Schedule.
</TABLE>

<PAGE>   1

                                                                     EXHIBIT 3.1


                            CERTIFICATE OF AMENDMENT

                                     TO THE

                       CERTIFICATE OF LIMITED PARTNERSHIP

                                       OF

                      LEVIATHAN GAS PIPELINE PARTNERS, L.P.



         The undersigned, desiring to amend the Certificate of Limited
Partnership of LEVIATHAN GAS PIPELINE PARTNERS, L.P., pursuant to the provisions
of Section 17-202 of the Revised Uniform Limited Partnership Act of the State of
Delaware, does hereby certify as follows:

         FIRST: The name of the Limited Partnership is:

                      Leviathan Gas Pipeline Partners, L.P.

         SECOND: Article I of the Certificate of Limited Partnership shall be
amended as follows:

                                   "ARTICLE I

                                      NAME

                  The name of the limited partnership shall be El Paso Energy
         Partners, L.P."

         THIRD: This amendment to the Certificate of Limited Partnership shall
be effective as of December 1, 1999.

         IN WITNESS WHEREOF, the undersigned executed this Amendment to the
Certificate of Limited Partnership on this 29th day of November 1999.


                                       LEVIATHAN GAS PIPELINE COMPANY
                                         the General Partner



                                       By:       /s/ C. DANA RICE
                                          --------------------------------------
                                                     C. Dana Rice
                                               Vice President and Treasurer


<PAGE>   1

                                                                     EXHIBIT 3.2


                                 AMENDMENT NO. 3
                                     TO THE
              AMENDED AND RESTATED AGREEMENT OF LIMITED PARTNERSHIP
                                       OF
                      LEVIATHAN GAS PIPELINE PARTNERS, L.P.


         This Amendment, dated as of November 30, 1999 (this "Amendment"), to
the Amended and Restated Agreement of Limited Partnership of Leviathan Gas
Pipeline Partners, L.P., a Delaware limited partnership (the "Partnership"),
dated as of February 19, 1993 (the "Partnership Agreement"), is entered into by
and among Leviathan Gas Pipeline Company, a Delaware corporation (the "General
Partner"), as the general partner of the Partnership, and the Limited Partners
(as defined in the Partnership Agreement).

                                    RECITALS

         WHEREAS, the names of both the General Partner and the Partnership are
being changed, effective as of December 1, 1999; and

         WHEREAS, the General Partner deems it to be in the Partnership's best
interests to amend the Partnership Agreement to reflect the current names of the
General Partner and the Partnership.

         NOW, THEREFORE, AND IN CONSIDERATION of the mutual covenants,
conditions and agreements contained in this Amendment, the parties hereto agree
as follows:

                                    AGREEMENT

         1. Undefined Terms. Undefined terms used herein shall have the meanings
ascribed such terms in the Partnership Agreement.

         2. Amendments.

                  All references to the General Partner contained in the
                  Partnership Agreement shall hereafter be deemed to mean "El
                  Paso Energy Partners Company" and all references to the
                  Partnership contained in the Partnership Agreement shall
                  hereafter be deemed to mean "El Paso Energy Partners, L.P."



<PAGE>   2

         IN WITNESS WHEREOF, the parties have executed this Agreement as of the
30th day of November 1999.

                                       EL PASO ENERGY PARTNERS COMPANY
                                       as General Partner


                                       By: /s/ ROBERT G. PHILLIPS
                                          --------------------------------------
                                                  Robert G. Phillips
                                                Chief Executive Officer


                                       EL PASO ENERGY PARTNERS COMPANY
                                       as Attorney-in-Fact for all Limited
                                       Partners


                                       By: /s/ ROBERT G. PHILLIPS
                                          --------------------------------------
                                                 Robert G. Phillips
                                               Chief Executive Officer


<PAGE>   1

                                                                   EXHIBIT 10.14


                      LIMITED LIABILITY COMPANY AGREEMENT

                                       OF

                     POSEIDON OIL PIPELINE COMPANY, L.L.C.

                     (A DELAWARE LIMITED LIABILITY COMPANY)

                        (DATED AS OF FEBRUARY 14, 1996)
<PAGE>   2
                               TABLE OF CONTENTS

<TABLE>
<S>                                                                        <C>
ARTICLE I. DEFINITIONS ...................................................... 1
     1.01      Specific Definitions ......................................... 1
     1.02      Other Terms ................................................. 11
     1.03      Construction ................................................ 11

ARTICLE II. ORGANIZATION ................................................... 12
     2.01      Formation ................................................... 12
     2.02      Name ........................................................ 12
     2.03      Principal Office in the United States; Other Offices ........ 12
     2.04      Purpose ..................................................... 12
     2.05      Foreign Qualification ....................................... 12
     2.06      Term ........................................................ 12
     2.07      Mergers and Exchanges ....................................... 12
     2.08      Business Opportunities--No Implied Duty or Obligation ....... 12

ARTICLE III. MEMBERSHIP INTERESTS AND TRANSFERS ............................ 13
     3.01      Initial Members ............................................. 13
     3.02      Number of Members ........................................... 13
     3.03      Membership Interest ......................................... 13
     3.04      Representation and Warranties ............................... 13
     3.05      Restrictions on the Transfer of a Membership Interest ....... 14
     3.06      Transfer .................................................... 15
     3.07      Documentation; Validity of Transfer ......................... 17
     3.08      [Intentionally Deleted.]  ................................... 18
     3.09      Possible Additional Restrictions on Transfer ................ 18
     3.10      Additional Membership Interests ............................. 18
     3.11      Interests in a Member ....................................... 18
     3.12      Information ................................................. 18
     3.13      Liability to Third Parties .................................. 19
     3.14      Withdrawal .................................................. 19
     3.15      Lack of Member Authority .................................... 20
     3.16      Security Interest of Members ................................ 20

ARTICLE IV. CAPITAL CONTRIBUTIONS .......................................... 20
     4.01      Initial Capital Contributions ............................... 20
     4.02      Subsequent Contributions .................................... 21
     4.03      Failure to Contribute ....................................... 21
     4.04      Return of Contributions ..................................... 23
     4.05      Advances by Members ......................................... 24
     4.06      Capital Accounts ............................................ 24
     4.07      Capitalization of Loans ..................................... 26
</TABLE>

                                       i

<PAGE>   3


<TABLE>
<S>                                                                  <C>
ARTICLE V. ALLOCATIONS AND DISTRIBUTIONS ............................ 27
     5.01    Allocations for Capital Account Purposes ............... 27
     5.02    Allocations for Tax Purposes ........................... 29
     5.03    Requirement of Distributions ........................... 30
     5.04    Pro Rata Distributions ................................. 30
     5.05    Reserves ............................................... 31
     5.06    Distribution Restrictions .............................. 31

ARTICLE VI. MANAGEMENT OF THE COMPANY ............................... 31
     6.01    Management by the Members and Delegation of Authority .. 31
     6.02    Committees ............................................. 31
     6.03    Authority of Members and Committees .................... 32
     6.04    Officers ............................................... 34
     6.05    Duties of Officers ..................................... 35
     6.06    No Duty to Consult ..................................... 35
     6.07    Reimbursement  ......................................... 36
     6.08    Members and Affiliates Dealing With the Company ........ 36
     6.09    Insurance .............................................. 36

ARTICLE VII. MEETINGS ............................................... 36
     7.01    Meetings ............................................... 36
     7.02    Special Actions ........................................ 38
     7.03    Voting List ............................................ 38
     7.04    Proxies ................................................ 39
     7.05    Votes .................................................. 39
     7.06    Conduct of Meetings .................................... 39
     7.07    Action by Written Consent .............................. 39
     7.08    Records ................................................ 40

ARTICLE VIII. INDEMNIFICATION ....................................... 40
     8.01    Right to Indemnification ............................... 40
     8.02    Indemnification of Officers, Employees and Agents ...... 41
     8.03    Advance Payment ........................................ 41
     8.04    Appearance as a Witness ................................ 41
     8.05    Nonexclusivity of Rights ............................... 42
     8.06    Insurance .............................................. 42
     8.07    Member Notification .................................... 42
     8.08    Savings Clause ......................................... 42
     8.09    Scope of Indemnity ..................................... 42

ARTICLE IX. TAXES ................................................... 42
     9.01    Tax Returns ............................................ 42
     9.02    Tax Elections .......................................... 43
     9.03    Tax Matters Member ..................................... 43
</TABLE>



                                       ii
<PAGE>   4

<TABLE>
<S>                                                                            <C>
ARTICLE X. BOOKS, RECORDS, REPORTS, AND BANK ACCOUNTS ......................... 43
     10.01   Maintenance of Books ............................................. 43
     10.02   Financial Statements ............................................. 44
     10.03   Tax Statements ................................................... 44
     10.04   Accounts ......................................................... 44

ARTICLE XI. BANKRUPTCY OF A MEMBER ............................................ 45
     11.01    Bankrupt Members ................................................ 45

ARTICLE XII. DISSOLUTION, LIQUIDATION, AND TERMINATION ........................ 45
     12.01    Dissolution ..................................................... 45
     12.02    Liquidation and Termination ..................................... 46
     12.03    Provision for Contingent Claims ................................. 48
     12.04    Deficit Capital Accounts ........................................ 48

ARTICLE XIII. AMENDMENT OF THE AGREEMENT ...................................... 49
     13.01    Amendments to be Adopted by the Company ......................... 49
     13.02    Amendment Procedures ............................................ 49

ARTICLE XIV. CERTIFICATED MEMBERSHIP INTERESTS ................................ 50
     14.01    Entitlement to Certificates ..................................... 50
     14.02    Multiple Classes of Interest .................................... 50
     14.03    Signatures ...................................................... 50
     14.04    Issuance and Payment ............................................ 50
     14.05    Restrictive Legend .............................................. 51
     14.06    Lost, Stolen or Destroyed Certificates .......................... 51
     14.07    Transfer of Membership Interest ................................. 51
     14.08    Registered Holders .............................................. 52

ARTICLE XV. OTHER MEMBER AGREEMENTS AND OBLIGATIONS ........................... 52
     15.01    Participation in Extensions and Expansions ...................... 52

ARTICLE XVI. GENERAL PROVISIONS ............................................... 53
     16.01    Offset .......................................................... 53
     16.02    Entire Agreement; Supersedure ................................... 53
     16.03    Waivers ......................................................... 53
     16.04    Binding Effect .................................................. 54
     16.05    Member and Committee Deadlocks; Negotiations, Mediation and
              Arbitration ..................................................... 54
     16.06    Governing Law; Severability ..................................... 56
     16.07    Further Assurances .............................................. 57
     16.08    Waiver of Certain Rights ........................................ 57
     16.09    Notice to Members of Provisions of this Agreement ............... 57
     16.10    Counterparts .................................................... 57
</TABLE>


                                      iii
<PAGE>   5

<TABLE>
<S>                                                                   <C>
16.11    Attendance via Communications Equipment ..................... 57
16.12    Reports to Members .......................................... 57
16.13    Checks, Notes and Contracts ................................. 58
16.14    Seal ........................................................ 58
16.15    Books and Records ........................................... 58
16.16    Surety Bonds ................................................ 58
16.17    Audit Rights of Members ..................................... 58
16.18    No Third Party Beneficiaries ................................ 58
16.19    Notices ..................................................... 59
</TABLE>


                                       iv
<PAGE>   6
                      LIMITED LIABILITY COMPANY AGREEMENT
                                       OF
                     POSEIDON OIL PIPELINE COMPANY, L.L.C.
                     (A DELAWARE LIMITED LIABILITY COMPANY)

         This Limited Liability Company Agreement of Poseidon Oil Pipeline
Company, L.L.C., dated as of February 14, 1996, is (a) adopted by the Members
(as defined below) and (b) executed and agreed to, for good and valuable
consideration, by the Members.

                                   ARTICLE I.
                                  DEFINITIONS

         1.01     SPECIFIC DEFINITIONS. As used in this Agreement, the
following terms have the following meanings:

                  "AAA" has the meaning given that term in Section 16.05(b)
         herein.

                  "Act" means the Delaware Limited Liability Company Act and
         any successor statute, as amended from time to time.

                  "Additional Capital Contribution" has the meaning given to
         that term in Section 4.05 herein.

                  "Adjusted Capital Account" means the Capital Account
         maintained for each Member as of the end of each taxable year of the
         Company, (a) increased by any amounts that such Member is obligated to
         restore under the standards set by Treasury Regulation section
         1.704-1(b)(2)(ii)(c) (or is deemed obligated to restore pursuant to
         the penultimate sentences of Treasury Regulation sections
         1.704-2(g)(1) and 1.704-2(i)(5)), and (b) decreased by (i) the amount
         of all losses and deductions that, as of the end of such taxable year,
         are reasonably expected to be allocated to such Member in subsequent
         years under sections 704(e)(2) and 706(d) of the Code and Treasury
         Regulation section 1.751-1(b)(2)(ii), and (ii) the amount of all
         distributions that, as of the end of such taxable year, are reasonably
         expected to be made to such Member in subsequent years in accordance
         with the terms of this Agreement or otherwise to the extent they
         exceed offsetting increases to such Member's Capital Account that are
         reasonably expected to occur during (or prior to) the year in which
         such distributions are reasonably expected to be made (other than
         increases as a result of a minimum chargeback pursuant to Section
         5.01(d) or 5.01(e)). The foregoing definition of Adjusted Capital
         Account is intended to comply with the provisions of Treasury
         Regulation section 1.704-1(b)(2)(ii)(d) and shall be interpreted
         consistently therewith.

                  "Adjusted Property" means any property, the Carrying Value of
         which has been adjusted pursuant to Section 4.06(d). Once an Adjusted
         Property is deemed distributed

                                       1
<PAGE>   7
         by, and recontributed to, the Company for federal income tax purposes
         upon a termination thereof pursuant to section 708 of the Code, such
         property shall thereafter constitute a Contributed Property until the
         Carrying Value of such property is further adjusted pursuant to Section
         4.06(d).

                  "Advancing Members" has the meaning given to that term in
         Section 4.05 herein.

                  "Affiliate" means, with respect to any relevant Person, any
         other Person that directly or indirectly controls, is controlled by,
         or is under common control with, such relevant Person in question. As
         used herein, the term "control" (including its derivatives and similar
         terms) means owning, directly or indirectly, more than 50% of the
         interest in any such relevant Person if such interest has, directly or
         indirectly, the power to direct or cause the direction of the
         management and policies of such relevant Person.

                  "Agreed Value" of any Contributed Property means the fair
         market value of such property or other consideration at the time of
         contribution as determined by the Company using such reasonable method
         of valuation as it may adopt. The Company shall, in its sole
         discretion, use such method as it deems reasonable and appropriate to
         allocate the aggregate Agreed Value of Contributed Properties in a
         single or integrated transaction among such properties on a basis
         proportional to their fair market value. In the event of a breach of
         a representation or warranty by a Member contained in a contribution
         agreement pertaining to a Contributed Property, the Agreed Value of
         such Contributed Property (and such Member's Capital Account) shall be
         reduced by (i) the diminution in value of the Contributed Property
         associated with such breach less (ii) the amount of any indemnity
         payments actually paid to the Company by such Member with respect to
         such breach.

                  "Agreement" means this Limited Liability Company Agreement
         (including any schedules, exhibits or attachments hereto) as amended,
         supplemented or modified from time to time.

                  "Available Cash" means unrestricted cash and cash equivalents
         of the Company less reasonable reserves, including, without
         limitation, those necessary for working capital and obligations or
         other contingencies of the Company. Available Cash shall not include
         any Initial Capital Contributions except to the extent that all of the
         Members agree that the applicable portion of any such Initial Capital
         Contribution is no longer needed to finance the construction of the
         Poseidon Pipeline or the operations of the Company.

                  "Bankrupt Member" means (except to the extent a Majority
         Interest consents otherwise) any Member:

                           (a) that (i) makes a general assignment for the
                  benefit of creditors; (ii) files a voluntary bankruptcy
                  petition; (iii) becomes the subject of an order


                                       2
<PAGE>   8
                  for relief or is declared insolvent in any federal or state
                  bankruptcy or insolvency proceeding; (iv) files a petition or
                  answer seeking for the Member a reorganization, arrangement,
                  composition, readjustment, liquidation, dissolution, or
                  similar relief under any law; (v) files an answer or other
                  pleading admitting or failing to contest the material
                  allegations of a petition filed against the Member in a
                  proceeding of the type described in subclauses (i) through
                  (iv) of this clause (a); or (vi) seeks, consents, or
                  acquiesces to the appointment of a trustee, receiver, or
                  liquidator of the Member or of all or any substantial part of
                  the Member's properties; or

                           (b) against which a proceeding seeking
                  reorganization, arrangement, composition, readjustment,
                  liquidation, dissolution, or similar relief under any law has
                  been commenced and 90 days have expired without dismissal
                  thereof or with respect to which, without the Member's
                  consent or acquiescence, a trustee, receiver, or liquidator of
                  the Member or of all or any substantial part of the Member's
                  properties has been appointed and 60 days have expired without
                  such appointments having been vacated or stayed, or 60 days
                  have expired after the date of expiration of a stay, if the
                  appointment has not previously been vacated.

                  In addition, Poseidon, and any of its Transferees or
         Substituted Members, shall be deemed to be a Bankrupt Member if any of
         the foregoing events occur with respect to the Guarantor.

                  "Book-Tax Disparity" means with respect to any item of
         Contributed Property or Adjusted Property, as of the date of any
         determination, the difference between the Carrying Value of such
         Contributed Property or Adjusted Property and the adjusted basis
         thereof for federal income tax purposes as of such date. A Member's
         share of the Company's Book-Tax Disparities in all of its Contributed
         Property and Adjusted Property will be reflected by the difference
         between such Member's Capital Account balance as maintained pursuant to
         Section 4.06 and the hypothetical balance of such Member's Capital
         Account computed as if it had been maintained strictly in accordance
         with federal income tax accounting principles. The determination of
         Book-Tax disparity and a Member's share thereof shall be determined
         consistently with Section 1.704-3(c) of the Treasury Regulations.

                  "Business Day" means Monday through Friday of each week,
         except that a legal holiday recognized as such by the government of the
         United States or the State of New York shall not be regarded as a
         Business Day.

                  "Business Development Committee" has the meaning given that
         term in Section 6.02.



                                       3

<PAGE>   9




                  "Capital Account" means the capital account maintained for
         each Member pursuant to Section 4.06 herein.

                  "Capital Contribution" means any contribution by a Member to
         the capital of the Company, as contemplated by Section 4.06(a).

                  "Carrying Value" means (a) with respect to Contributed
         Property, the Agreed Value of such property reduced (but not below
         zero) by all depreciation, amortization and cost recovery deductions
         relating to such property charged to the Members' Capital Accounts, and
         (b) with respect to any other Company property, the adjusted basis of
         such property for federal income tax purposes, all as of the time of
         determination. The Carrying Value of any property shall be adjusted
         from time to time in accordance with Sections 4.06(d)(i) and
         4.06(d)(ii) and to reflect changes, additions or other adjustments to
         the Carrying Value for dispositions and acquisitions of Company
         properties, as deemed appropriate by the Company.

                  "Certificate" has the meaning given that term in Section 2.01.

                  "Code" means the Internal Revenue Code of 1986 and any
         successor statute, as amended from time to time.

                  "Company" means Poseidon Oil Pipeline Company, L.L.C., a
         Delaware limited liability company.

                  "Company Minimum Gain" means the amount determined pursuant
         to Treasury Regulation Section 1.704-2(d).

                  "Contributed Property" means each property or other asset, in
         such form as may be permitted by the Act, but excluding cash or cash
         equivalents, contributed to the Company (or deemed contributed to the
         Company on termination and reconstitution thereof pursuant to section
         708 of the Code). Once the Carrying Value of a Contributed Property is
         adjusted pursuant to Section 4.06(d), such property shall no longer
         constitute a Contributed Property for purposes of Section 5.02, but
         shall be deemed an Adjusted Property for such purposes.

                  "Costs" has the meaning given that term in Section
         4.03(a)(ii)(3).

                  "Declining Member" has the meaning given to that term in
         Section 4.05 herein.

                  "Default" means, in respect of any Member, upon the occurrence
         and during the continuation of any of the following events:

                           (a) the failure to remedy within five (5) Business
                  Days of receipt of written notice thereof from the Company or
                  any Member, the failure of a


                                       4

<PAGE>   10




                  Member to make any Initial Capital Contribution to the Company
                  as required pursuant to Section 4.01, on the date on which
                  such Initial Capital Contribution is due;

                           (b) the occurrence of any event that causes such
                  Member to become a Bankrupt Member; or

                           (c) the failure to remedy within ten (10) Business
                  Days of receipt of written notice thereof, the default in
                  performance of or failure to comply with any other material
                  agreements, obligations or undertakings of such Member (or, in
                  the case of Poseidon, or any of its Transferees or Substituted
                  Members, the Guarantor) contained in the Transaction
                  Documents.

                  "Default Interest Rate" means a rate per annum, compounded
         daily, equal to the lesser of (a) 4% plus a varying rate per annum that
         is equal to the interest rate publicly quoted or announced by Chase
         Manhattan Bank (New York, New York office), from time to time as its
         prime commercial or similar reference interest rate, with adjustments
         in that varying rate to be made on the same date as any change in that
         rate, and (b) the maximum rate permitted by applicable law.

                  "Delinquent Member" has the meaning given that term in Section
         4.03(a).

                  "Economic Risk of Loss" has the meaning set forth in Treasury
         Regulation section 1.752-2(a).

                  "Eligible Citizen" means a Person qualified to hold leases,
         rights-of-way, permits, licenses or other similar agreements or
         documents issued by or entered into with the United States government,
         and whose status as a Member or Transferee does not or would not
         subject the Company to a substantial risk of cancellation or forfeiture
         of any such lease, right-of-way, permit, license or other similar
         agreement or document issued by or entered into with the United States
         government. As of the date hereof, "Eligible Citizen" means (a) a
         citizen of the United States, (b) an association (including a
         partnership, joint tenancy in common) organized or existing under the
         Laws of the United States or any state or territory thereof, all of the
         members of which are citizens of the United States or (c) a corporation
         organized under the Laws of the United States or of any state or
         territory thereof, of which corporation, to the best of its knowledge,
         not more than five percent of the voting stock, or of all the stock, is
         owned or controlled by citizens of countries that deny to United States
         citizens privileges to own stock in corporations holding oil and gas
         leases similar to the privileges of non-United States citizens to own
         stock in corporations holding an interest in oil and gas leases on
         federal lands.

                  "Foreclosure Transfer" means any Transfer resulting from any
         judicial or non-judicial foreclosure by the holder of a Security
         Interest or Transfer from the holder of a Security Interest in
         connection with a workout or similar arrangement.



                                       5

<PAGE>   11

                  "GAAP" has the meaning given that term in Section 3.06(b)
         herein.

                  "General Interest Rate" means a rate per annum, compounded
         daily, equal to the lesser of (a) a varying rate per annum that is
         equal to the interest rate publicly quoted by Chase Manhattan Bank (New
         York, New York office), a national banking association, from time to
         time as its prime commercial or similar reference interest rate, with
         adjustments in that varying rate to be made on the same date as any
         change in that rate, plus one percent and (b) the maximum rate
         permitted by applicable law.

                  "Guarantor" means Leviathan Gas Pipeline Partners, L.P., a
         Delaware limited partnership.

                  "Initial Capital Contribution" shall have the meaning given
         that term in Section 4.01 herein.

                  "Lateral Opportunity" has the meaning given that term in
         Section 15.01.

                  "Lateral Opportunity Notice" has the meaning given that term
         in Section 15.01.

                  "Laws" means the laws, rules, regulations, decrees and orders
         of the United States of America and all other governmental authorities
         having jurisdiction, whether such Laws now exist or hereafter come into
         effect.

                  "Lending Member" has the meaning given that term in Section
         4.03(a)(ii).

                  "Liquidator" has the meaning given to that term in Section
         12.02.

                  "Majority Interest" means one or more Members having among
         them more than 50% of the Membership Interests of all Members.

                  "Management Committee" has the meaning given that term in
         Section 6.02.

                  "Member" means any Person executing this Agreement as of even
         date herewith as a Member or any Person hereafter admitted to the
         Company as an additional Member or Substituted Member as provided in
         this Agreement, but does not include any Person who has ceased to be a
         Member in the Company.

                  "Membership Interest" means the ownership interest (on a
         percentage basis) of a Member in the Company, including, without
         limitation, rights to distributions (liquidating or otherwise),
         allocations, information, and to consent or approve, which ownership
         interest is more particularly described and identified in Article III
         and Exhibit A.



                                       6

<PAGE>   12




                  "Minimum Gain Attributable to Member Nonrecourse Debt" means
         that amount determined in accordance with the principles of Treasury
         Regulation section 1.704-2(i)(3).

                  "Net Agreed Value" means (a) in the case of any Contributed
         Property, the fair market value of such property reduced by any
         liabilities either assumed by the Company upon such contribution or to
         which such property is subject when contributed, and (b) in the case of
         any property distributed to a Member or Transferee by the Company, the
         Company's Carrying Value of such property at the time such property is
         distributed, reduced by any indebtedness either assumed by such Member
         or Transferee upon such distribution or to which such property is
         subject at the time of distribution as determined under section 752 of
         the Code.

                  "Net Income" means, for any taxable period, the excess, if
         any, of the Company's items of income and gain for such taxable period
         over the Company's items of loss and deduction for such taxable period.
         The items included in the calculation of Net Income shall be determined
         in accordance with Section 4.06(b) and shall not include any items
         specifically allocated under Sections 5.01(d) through 5.01(i). For
         purposes of Sections 5.01(a) and (b), in determining whether Net Income
         has been allocated to any Member for any previous taxable period, any
         Unrealized Gain or Unrealized Loss allocated pursuant to Section
         4.06(d) shall be treated as an item of gain or loss in computing Net
         Income.

                  "Net Loss" means, for any taxable period, the excess, if any,
         of the Company's items of loss and deduction for such taxable period
         over the Company's items of income and gain for such taxable period.
         The items included in the calculation of Net Loss shall be determined
         in accordance with Section 4.06(b) and shall not include any items
         specifically allocated under Sections 5.01(d) through 5.01(i). For
         purposes of Sections 5.01(a) and (b), in determining whether Net Loss
         has been allocated to any Member for any previous taxable period, any
         Unrealized Gain or Unrealized Loss allocated pursuant to Section
         4.06(d) shall be treated as an item of gain or loss in computing Net
         Loss.

                  "Nonrecourse Built-In Gain" means with respect to any
         Contributed Properties or Adjusted Properties that are subject to a
         mortgage or negative pledge securing a nonrecourse liability, the
         amount of any taxable gain that would be allocated to the Members
         pursuant to Section 5.02(b)(i)(A), 5.02(b)(ii)(A) or 5.02(b)(iii) if
         such properties were disposed of in a taxable transaction in full
         satisfaction of such liabilities and for no other consideration.

                  "Nonrecourse Debt" has the meaning set forth in Treasury
         Regulation section 1.704-2(b)(4).

                  "Nonrecourse Deductions" means any and all items of loss,
         deduction, or expenditure (described in section 705(a)(2)(B) of the
         Code) that, in accordance with the


                                       7

<PAGE>   13




         principles of Treasury Regulation section 1.704-2(b)(i), are
         attributable to a Nonrecourse Liability.

                  "Nonrecourse Liability" has the meaning assigned to such term
         in Treasury Regulation section 1.704-2(b)(3).

                  "Non-Selling Members" has the meaning given that term in
         Section 3.06(e) herein.

                  "Offer Notice" has the meaning given that term in Section
         3.06(e) herein.

                  "Oil Contract" means any contract, agreement or other
         obligation of the Company to buy, sell, transport, gather or otherwise
         handle oil or liquid condensate or to construct, maintain or operate
         any pipelines or facilities in connection therewith.

                  "Obligation" has the meaning given that term in Section
         4.03(a)(ii)(2).

                  "Onshore Segment" means either (i) the assets subject to that
         certain Purchase and Sale Agreement dated as of June 12, 1995, between
         Texaco Pipeline Inc. ("TPL") and Texas Eastern Transmission
         Corporation, as amended from time to time, if the Members decide to
         consummate the acquisition of such assets, or (ii) the assets described
         in the agreement referred to in clause (b)(vii) of the definition of
         "Transaction Documents," if the Members decide not to consummate the
         acquisition of the assets referred to in clause (i) above and to
         proceed under such agreement.

                  "Operating Committee" has the meaning given that term in
         Section 6.02(a).

                  "Option Period" has the meaning given that term in Section
         3.06(e) herein.

                  "Person" means any individual or entity, including, without
         limitation, any corporation, limited liability company, partnership
         (general or limited), joint venture, association, joint stock company,
         trust, unincorporated organization or government (including any board,
         agency, political subdivision or other body thereof).

                  "Phase I Line" means the pipeline and facilities to be
         installed pursuant to that certain (i) Construction Agreement of even
         date herewith between the Company and Poseidon and (ii) Offshore
         Pipeline Installation Agreement dated August 17, 1995 between Poseidon
         and J. Ray McDermott, Inc., which pipeline and facilities are more
         particularly described on "Exhibit B. "

                  "Phase II Line" means the pipeline and facilities to be
         installed pursuant to that certain (i) Construction Agreement of even
         date herewith between the Company and Texaco and (ii) offshore pipeline
         installation agreement entered into with an independent




                                       8

<PAGE>   14



         contractor in connection with such Construction Agreement, which
         pipeline and facilities are more particularly described on Exhibit B.

                  "Poseidon" means Poseidon Pipeline Company, L.L.C.

                  "Poseidon Pipeline" means that certain oil pipeline to be
         constructed and owned by Company and operated by Company or its
         designee and located offshore Louisiana, Outer Continental Shelf,
         comprised of (i) the Phase I Line, (ii) the Phase II Line, (iii) the
         Onshore Segment, (iv) any laterals constructed by Company pursuant to
         Section 15.01 or purchased by the Company, (v) any other facilities
         constructed by Company and (vi) the equipment, facilities and fixtures
         located on or connected to such pipelines and facilities described in
         (i) through (iv) above and owned by Company, but excluding any
         equipment, facilities or fixtures owned (wholly or partially) by any
         Person other than Company.

                  "Proceeding" has the meaning given that term in Section 8.01.

                  "Recapture Income" means any gain recognized by the Company
         (computed without regard to any adjustment required by section 734 or
         743 of the Code) upon the disposition of any property or asset of the
         Company, which gain is characterized as ordinary income because it
         represents the recapture of deductions previously taken with respect to
         such property or asset.

                  "Record Date" means the date established by the Company for
         determining (a) the identity of Members (or Transferees, if applicable)
         entitled to notice of, or to vote at any meeting of Members or entitled
         to vote by ballot or give approval of Company action in writing without
         a meeting or entitled to exercise rights in respect of any lawful
         action of Members, or (b) the identity of Record Holders entitled to
         receive any report or distribution.

                  "Record Holder" means the Person in whose name a Membership
         Interest is registered on the books of the Company as of the opening of
         business on a particular Business Day.

                  "Rejected Lateral Opportunity" has the meaning given that
         term in Section 15.01.

                  "Required Interest" means the applicable percentage of
         Membership Interests of all Members required to authorize or approve a
         relevant act of the Company, including, without limitation, a Majority
         Interest, a Super-Majority Interest or all Membership Interests, as
         applicable.

                  "Residual Gain" or "Residual Loss" means any item of gain or
         loss, as the case may be, of the Company recognized for federal income
         tax purposes resulting from a sale,



                                       9

<PAGE>   15




         exchange or other disposition of a Contributed Property or Adjusted
         Property, to the extent such item of gain or loss is not allocated
         pursuant to Section 5.02(b)(i)(A) or 5.02(b)(ii)(A), to eliminate
         Book-Tax Disparities.

                  "Security Interest" means any security interest, lien,
         mortgage, encumbrance, hypothecation, pledge, or other obligation,
         whether created by operation of law or otherwise, created by any Person
         in any of its property or rights.

                  "Selling Member" has the meaning given that term in Section
         3.06(e) herein.

                  "Service" means the Internal Revenue Service.

                  "Substituted Member" means a Person who is admitted as a
         Member to the Company pursuant to Section 3.05 in place of and with all
         the rights of a Member and who is shown as a Member on the books and
         records of the Company.

                  "Super-Majority Interest" means one or more Members having
         among them at least 66 2/3% of the Membership Interests of all Members.

                  "Tax Matters Member" has the meaning given that term in
         Section 9.03.

                  "Texaco" means Texaco Trading and Transportation Inc.

                  "Transaction Documents" means (a) this Agreement, (b) each of
         the following documents of even date herewith: (i) the Operation and
         Management Agreement between the Company and Texaco; (ii) the
         Construction Agreement between Poseidon and the Company; (iii) the
         Construction Agreement between the Company and Texaco; (iv) the
         Contribution Agreement between Poseidon and certain of its Affiliates
         and the Company; (v) the Contribution Agreement between Texaco and one
         of its Affiliates and the Company; (vi) the Letter Agreement among the
         Company, Manta Ray Gathering Systems, Inc., Poseidon and Texaco; (vii)
         the Letter Agreement among the Company, Poseidon, Texaco and Texaco
         Pipeline Inc.; (viii) the Agreement between Poseidon and Texaco
         regarding the letter of credit issued in favor of the Company and (ix)
         the Guaranty made by Leviathan Gas Pipeline Partners, L.P. and (c) the
         Platform Limited Right of Use Agreement and the Lease Agreement, each
         between the Company and Louisiana Offshore Gathering Systems, L.L.C.,
         and each as described in the Letter Agreement described in subsection
         (b)(vii), above.

                  "Transferee" means a Person who receives all or part of a
         Member's Membership Interest through a Transfer but who has not become
         a Substituted Member.

                  "Transferor" means a Member, Substituted Member or a
         predecessor Transferor who Transfers a Membership Interest.


                                       10

<PAGE>   16


                  "Transfer" or "Transferred" means, other than granting a
         Security Interest and making a Transfer in connection with any such
         Security Interest, (i) a voluntary or involuntary sale, assignment,
         transfer, conveyance, exchange, bequest, devise, gift or any other
         alienation (in each case, with or without consideration) of any rights,
         interest or obligations with respect to all or any portion of any
         Membership Interest including, without limitation, a Foreclosure
         Transfer, or (ii) (A) the sale of all or substantially all of a
         Member's assets, (B) a merger or consolidation involving a Member or
         (C) a transfer, directly or indirectly, in one or more transactions, of
         a majority of the equity interests in a Member to a Person that is not
         an Affiliate of such Member prior to such transfer; provided, however,
         that a transfer, directly or indirectly, of the equity ownership
         (including, without limitation, a merger, consolidation, share exchange
         or similar transaction) or of all or substantially all of the assets of
         the Guarantor or Texaco shall not be considered a Transfer
         hereunder.

                  "Treasury Regulation" shall have the meaning set forth in
         Section 3.09.

                  "Unrealized Gain" attributable to any item of Company property
         means, as of any date of determination, the excess, if any, of (a) the
         fair market value of such property as of such date over (b) the
         Carrying Value of such property as of such date (prior to any
         adjustment to be made pursuant to Section 4.06(d) as of such date). In
         determining such Unrealized Gain, the aggregate cash amount and fair
         market value of a Company asset (including cash or cash equivalents)
         shall be determined by the Company using such reasonable method of
         valuation as it may adopt.

                  "Unrealized Loss" attributable to any item of Company property
         means, as of any date of determination, the excess, if any, of (a) the
         Carrying Value of such property as of such date (prior to any
         adjustment to be made pursuant to Section 4.06(d) as of such date) over
         (b) the fair market value of such property as of such date. In
         determining such Unrealized Loss, the aggregate cash amount and fair
         market value of a Company asset (including cash or cash equivalents)
         shall be determined by the Company using such reasonable method of
         valuation as it may adopt.

                  "Withdrawing Member" shall have the meaning given that term in
         Section 12.02(d) herein.

         1.02 OTHER TERMS. Other terms may be defined elsewhere in the text of
this Agreement and shall have the meaning indicated throughout this Agreement.

         1.03 CONSTRUCTION. Whenever the context requires, the gender of all
words used in this Agreement includes the masculine, feminine, and neuter. All
references to Articles and Sections refer to articles and sections of this
Agreement, and all references to Exhibits are to exhibits attached hereto, each
of which is incorporated herein for all purposes.



                                       11

<PAGE>   17




                                   ARTICLE II.
                                  ORGANIZATION

         2.01 FORMATION. The Company has been organized as a Delaware limited
liability Company by the filing of a Certificate of Formation (the
"Certificate") with the Secretary of State of the State of Delaware pursuant to
the Act.

         2.02 NAME. The name of the Company is Poseidon Oil Pipeline Company,
L.L.C. and all Company business must be conducted in that name or such other
names that comply with applicable law as the Company may select from time to
time.

         2.03 PRINCIPAL OFFICE IN THE UNITED STATES; OTHER OFFICES. The
principal office of the Company in the United States shall be at 1670 Broadway,
Denver, Colorado 80202, or at such other place as the Company may designate from
time to time, which need not be in the State of Delaware. The Company may have
such other offices as the Members may designate from time to time.

         2.04 PURPOSE. The sole and exclusive purpose of the Company is to
design, construct, own and operate the Poseidon Pipeline, including entering
into Oil Contracts related to the operation thereof.

         2.05 FOREIGN QUALIFICATION. Prior to the Company's conducting business
in any jurisdiction other than Delaware, the Company shall comply, to the extent
procedures are available and those matters are reasonably within the control of
the Company, with all requirements necessary to qualify the Company as a foreign
limited liability company, and, if necessary, keep the Company in good standing,
in that jurisdiction.

         2.06 TERM. Subject to earlier termination pursuant to other provisions
of this Agreement (including those contained in Article V), the term of the
Company shall be from the date of this Agreement through and including December
31, 2046.

         2.07 MERGERS AND EXCHANGES. Except as otherwise provided in this
Agreement or by applicable Laws, the Company may be a party to any (i) merger,
(ii) consolidation, (iii) exchange or acquisition or (iv) any other type of
reorganization.

         2.08 BUSINESS OPPORTUNITIES--NO IMPLIED DUTY OR OBLIGATION. The Members
and their respective Affiliates may engage, directly or indirectly, without the
consent of the other Members or the Company, in other business opportunities,
transactions, ventures or other arrangements of any nature or description,
independently or with others, including without limitation, business of a nature
which may be competitive with or the same as or similar to the business of the
Company, regardless of the geographic location of such business, and without any
duty or obligation to account to the other Members or the Company in connection
therewith.



                                       12

<PAGE>   18




                                  ARTICLE III.
                       MEMBERSHIP INTERESTS AND TRANSFERS

         3.01 INITIAL MEMBERS. The initial Members of the Company are the
Persons executing this Agreement as of the date hereof in such capacity, each of
which is admitted to the Company as a Member effective contemporaneously with
the execution by such Person of this Agreement.

         3.02 NUMBER OF MEMBERS. The number of Members of the Company shall
never be fewer than two.

         3.03 MEMBERSHIP INTERESTS. The Members agree that each Member's
ownership in the Company shall be that which is set forth in Exhibit A, as
amended from time to time in accordance with the terms of this Agreement.

         3.04 REPRESENTATIONS AND WARRANTIES. Each Member hereby represents and
warrants to the Company and each other Member that (a) it is duly formed,
validly existing and (if applicable) in good standing under the Laws of the
state of its formation, and if required by Laws is duly qualified to do business
and (if applicable) in good standing in the jurisdiction of its principal place
of business (if not formed therein); (b) that Member has full corporate, limited
liability company, partnership, trust, or other applicable power and authority
to execute and agree to this Agreement and to perform its obligations hereunder
and all necessary actions by the board of directors, shareholders, managers,
members, partners, trustees, beneficiaries, or other Persons necessary for the
due authorization, execution, delivery, and performance of this Agreement by
that Member have been duly taken; (c) that Member has duly executed and
delivered this Agreement and it is enforceable against such Member in accordance
with its terms, subject to bankruptcy, moratorium, insolvency and other Laws
generally affecting creditors' rights and general principles of equity (whether
applied in a proceeding in a court of Laws or equity); (d) that Member's
authorization, execution, delivery, and performance of this Agreement does not
conflict with any other material agreement or arrangement to which that Member
is a party or by which it is bound; (e) that member is an Eligible Citizen and
will remain an Eligible Citizen for so long as such Member remains a Member of
the Company; and (f) it (i) has been furnished with or given adequate access to
such information about the Company and the Membership Interest as the Member has
requested, (ii) has made its own independent inquiry and investigation into, and
based thereon has formed an independent judgment concerning, the Company and
that Member's Membership Interest therein, (iii) has adequate means of providing
for its current needs and possible individual contingencies and is able to bear
the economic risks of this investment and has a sufficient net worth to sustain
a loss of its entire investment in the Company in the event such loss should
occur, (iv) has such knowledge and experience in financial and business matters
as to be capable of evaluating the merits and risks of an investment in the
Company, (v) is an "accredited investor" within the meaning of "accredited
investor" under Regulation D of the Securities Act of 1933, as amended, and (vi)
understands and agrees that its Membership Interest shall not be sold, pledged,
hypothecated or otherwise transferred except in accordance


                                       13


<PAGE>   19




with the terms of this Agreement and pursuant to an applicable exemption from
registration under the Securities Act of 1933 and other applicable securities
Laws.

         3.05 RESTRICTIONS ON THE TRANSFER OF A MEMBERSHIP INTEREST. A Member
may Transfer all or part of a Membership Interest only in accordance with
applicable Laws and the provisions of this Agreement, including the following
provisions of this Section. Any purported Transfer in breach of the terms of
this Agreement shall be null and void ab initio, and the Company shall not
recognize any such prohibited Transfer.

         (a) A Membership Interest shall not be Transferred except pursuant to
an applicable exemption from registration under the Securities Act of 1933 and
other applicable securities Laws;

         (b) Except as otherwise provided in this Agreement or by applicable
Laws, a Transfer of a Membership Interest shall be effective only to give the
Transferee the right to receive the share of allocations and distributions to
which the Transferor would otherwise be entitled, and no Transferee of a
Membership Interest shall have the right to become a Substituted Member;

         (c) Unless and until a Transferee is admitted as a Substituted Member,
(i) the Transferee shall have no right to exercise any of the powers, rights and
privileges of a Member hereunder other than to receive its share of allocations
and distributions pursuant to Section 3.05(b), and (ii) the Member who has
Transferred all or any part of its Membership Interest to such Transferee shall
cease to be a Member with respect to such Membership Interest upon Transfer of
such Membership Interest and thereafter shall have no further powers, rights and
privileges as a Member hereunder with respect to such Membership Interest (to
the extent so Transferred), but shall, unless otherwise relieved of such
obligations, remain liable for all obligations and duties as a Member with
respect to such Membership Interest;

         (d) Subject to compliance with the terms and conditions of Section
3.06, a Transferee may become a Substituted Member if the Transferee agrees in
writing to be bound by all the terms and conditions, as then in effect, of this
Agreement;

         (e) At the time all of the provisions of Sections 3.05, 3.06 and 3.07
are complied with, (i) a Substituted Member shall have all of the powers,
rights, privileges, duties, obligations and liabilities of a Member, as provided
in this Agreement and by applicable Laws to the extent of the Membership
Interest so Transferred and (ii) the Member who Transferred the Membership
Interest shall be relieved of all of the obligations and liabilities with
respect to such Membership Interest; provided that such Member shall remain
fully liable for all liabilities and obligations relating to such Membership
Interest that accrued prior to such Transfer;

         (f) The Company may, in its reasonable discretion, charge a Member a
reasonable fee to cover the additional administrative expenses incurred in
connection with or as a consequence of any Transfer of all or part of such
Member's Membership Interest;


                                       14


<PAGE>   20




         (g) In the absence of the substitution (as provided herein) of a Member
for a transferring Member, any payment to the transferring Member shall acquit
the Company and the Members of all liability to any other Persons who may be
interested in such payment by reason of a Transfer by such Member;

         (h) Notwithstanding any term or condition contained in Sections 3.05,
3.06 and 3.07, any Person shall have the right to grant a Security Interest in
any rights or obligations such Person may have arising from or related to this
Agreement, the Company or any interest therein and make a Transfer in connection
with any such Security Interest; provided that such Security Interest is not
created in violation of Sections 3.05(a) and (i) of this Agreement and any other
provisions contained in this Agreement and the Company is promptly notified in
writing of such Security Interest; and

         (i) Each Member or Transferee agrees not to Transfer all or any part
of its Membership Interest (or take or omit any action, filing, election, or
other action which could result in a deemed Transfer) if such Transfer (either
considered alone or in the aggregate with prior Transfers by the same Member or
any other Members or Transferees) would result in the termination of the Company
for federal income tax purposes. Such an attempted Transfer is void ab initio.

         Notwithstanding any contrary provision contained in this Agreement, no
Person shall Transfer to any other Person such Person's rights or obligations
arising from or related to this Agreement, the Company or any interest therein
if such Transfer (A) would result in violation of the Act or any local, state or
federal (including agencies thereof) rule, statute or Laws (including, without
limitation, those promulgated by the Minerals Management Service), (B) would
alter the non-jurisdictional status of the Company with respect to the
jurisdiction of the Federal Energy Regulatory Commission or any successor
thereto or (C) have a material adverse effect on the assets or operations of the
Company. Any such attempted Transfers are void ab initio.

         3.06 TRANSFER RESTRICTIONS.

         (a) Neither the Company nor any of the Members shall be bound or
otherwise affected by any Transfer of Membership Interest of which such Person
has not received notice.

         (b) Any Member's Membership Interest may be Transferred to any Person
that is directly or indirectly controlled (through the ownership of voting
interests) by such Member (or, in the case of Poseidon, directly or indirectly
owned or controlled (through the ownership of voting interests) by the
Guarantor) so long as the Transferee or Substituted Member has a net worth
calculated in accordance with General Accepted Accounting Principles ("GAAP") of
not less than the lesser of (i) $150 million or (ii) the greater of (A) the net
worth of Transferor on the date of this Agreement or (B) the net worth of
Transferor immediately prior to the date of the Transfer. If the Transferor's
Membership Interest is subject to a guaranty, the guaranty shall apply to the
Transferee and its Membership Interest.



                                       15
<PAGE>   21


     (c) Subject to the right of first refusal set forth in Section 3.06(e), a
Member may Transfer all or any portion of its Membership Interest to any Person
that has a net worth calculated in accordance with GAAP of not less than $150
million immediately prior to the Transfer; provided that such net worth
requirement shall not apply in the case of a Foreclosure Transfer. Prior to a
Transfer under this Section 3.06(c), the Transfer must be approved in writing by
all non-transferring Members. Such approval will not be unreasonably delayed or
withheld.

     (d) Except with respect to a Foreclosure Transfer, a Member in Default
shall not Transfer its Membership Interest.

     (e) Except with respect to a Foreclosure Transfer or Transfers according to
the terms of Section 3.06(b), any Member who desires to Transfer all or any
portion of its Membership Interest ("Selling Member") to a ready, willing and
able Person shall first offer to sell such Membership Interest to the other
Members (the "Non-Selling Members") as a group. Such offer shall be made by an
irrevocable written offer (the "Offer Notice") to sell all of the Membership
Interest which the Selling Member desires to Transfer and shall contain a
complete description of the transaction in which the Selling Member proposes to
Transfer the Membership Interest, including, without limitation, the name of the
ready, willing and able Person and the consideration specified. The Non-Selling
Members shall have forty-five (45) days (the "Option Period") after actual
receipt of the Offer Notice within which to advise the Selling Member whether or
not they will purchase all of such Membership Interest upon the terms and
conditions contained in the Offer Notice. If, within the Option Period, one or
more Non-Selling Members elect to purchase such Membership Interest, then such
Non-Selling Member or Members shall close such transaction in accordance with
Section 3.06(f) no later than the later to occur of (i) the closing date set
forth in the Notice Offer or (ii) sixty (60) days after the last day of the
Option Period. If any Non-Selling Member does not elect to purchase its
proportionate share of the Membership Interest being sold, the remaining
Non-Selling Members shall have the right to purchase the remaining Membership
Interest based on the relation of their Membership Interest to the Membership
Interest of all Non-Selling Members desiring to purchase a portion of such
Membership Interest. The right herein created in favor of the Non-Selling
Members as a group is an option to purchase all, or none, of the Membership
Interest offered for sale by the Selling Member. If the Non-Selling Members as a
group decline to purchase all of the Membership Interest of the Selling Member
in accordance with this Section, the Selling Member may Transfer such Membership
Interest to the Person named in the Offer Notice delivered to the Non-Selling
Members upon the terms described in such Offer Notice. If such Transfer does not
occur in accordance with the terms of such Offer Notice, the Selling Member
shall again be subject to the provisions of this Section. Upon consummation of
any such Transfer (whether to a Member or any other Person), such Person and its
Membership Interest shall automatically become a party to and be bound by this
Agreement and shall thereafter have all of the rights and obligations of a
Member hereunder. Notwithstanding the foregoing, all Transfers pursuant to this
Section must also comply with and be governed by this Agreement, including any
restrictions on Transfers therein and on any Transferee becoming a Substituted
Member.

                                       16


<PAGE>   22


     (f) At the closing of the Transfer of a Membership Interest pursuant to
this Agreement, the transferee shall deliver to the Transferor (A) the full
consideration agreed upon and (B) a release of all personal liability of the
Transferor as a guarantor of any indebtedness for borrowed money of the Company
to any Person or, if a release reasonably cannot be obtained, an agreement
which, by its terms and substance, fully indemnifies the Transferor for such
liability. Any Membership Interest Transfer or similar taxes involved in such
sale shall be paid by the Transferor, and the Transferor shall provide the
transferee with such evidence of the Transferor's authority to Transfer
hereunder and such tax lien waivers and similar instruments as the transferee
may reasonably request.

     (g) If any governmental consent or approval is required with respect to any
Transfer, the transferee shall have a reasonable amount of time (not to exceed
sixty (60) days from the date upon which such Transfer would have been otherwise
consummated in accordance with the terms of this Agreement) to obtain such
consent or approval. All Members shall use reasonable, good faith efforts to
cooperate with the transferee attempting to obtain, and to assist in timely
obtaining, such consent or approval; provided that no Member shall be required
to incur any out-of-pocket costs in connection with such cooperation and
assistance. After the expiration of such waiting period, such transferee shall
forfeit its rights to acquire the Membership Interest with respect to such
specific transaction; provided, however, that such forfeiture shall not limit or
otherwise affect the forfeiting transferee's rights with respect to any
subsequent proposed Transfer.

     3.07 DOCUMENTATION; VALIDITY OF TRANSFER. The Company may not recognize for
any purpose any purported Transfer of all or any part of a Membership Interest
unless and until the applicable provisions of Sections 3.05 and 3.06 have been
satisfied and the Company has received, on behalf of the Company, a document in
a form acceptable to the Company executed by both the Member effecting the
Transfer (or if the Transfer is on account of the death, incapacity, or
liquidation of the Member, its representative) and the transferee. Such document
shall (i) include the notice address of any Person to be admitted to the Company
as a Substituted Member and such Person's agreement to be bound by this
Agreement with respect to the Membership Interest or part thereof being
obtained, (ii) set forth the Membership Interest after the Transfer of the
Member effecting the Transfer and the Person to which the Membership Interest or
part thereof is Transferred (which together must total the Membership Interest
of the Member effecting the Transfer before the Transfer), (iii) contain a
representation and warranty that the Transfer was made in accordance with all
applicable Laws (including state and federal securities Laws) and the terms and
conditions of this Agreement, and (iv) if the Person to which the Membership
Interest or part thereof is Transferred is to be admitted to the Company as a
Substituted Member, its representation and warranty that the representations and
warranties in Section 3.04 are true and correct with respect to such Person.
Each Transfer and, if applicable, admission complying with the provisions of
this Section 3.07 and Sections 3.05 and 3.06 is effective against the Company as
of the first business day of the calendar month immediately succeeding the month
in which (y) the Company receives the document required by this Section 3.07
reflecting such Transfer, and (z) the other requirements of Sections 3.05 and
3.06 have been met.

                                       17



<PAGE>   23


     3.08 [Intentionally Deleted.]

     3.09 POSSIBLE ADDITIONAL RESTRICTIONS ON TRANSFER. Notwithstanding anything
to the contrary contained in this Agreement, in the event of (i) the enactment
(or imminent enactment) of any legislation, (ii) the publication of any
temporary or final regulation by the Treasury Department ("Treasury
Regulation"), (iii) any ruling by the Service or (iv) any judicial decision that
in any such case, in the opinion of counsel, would result in the taxation of the
Company for federal income tax purposes as a corporation or would otherwise
subject the Company to being taxed as an entity for federal income tax purposes,
this Agreement shall be deemed to impose such restrictions on the Transfer of a
Membership Interest as may be required, in the opinion of counsel to the
Company, to prevent the Company from being taxed as a corporation or otherwise
being taxed as an entity for federal income tax purposes, and the Members
thereafter shall amend this Agreement as necessary or appropriate to impose such
restrictions.

     3.10 ADDITIONAL MEMBERSHIP INTERESTS. Additional Persons may be admitted to
the Company as Members, and Membership Interests may be created and issued to
those Persons and to existing Members upon a unanimous vote by the Members and
subject to the terms and conditions of this Agreement. Such admission must
comply with any additional terms and conditions the Members may in their sole
discretion determine at the time of admission. A document, in a form acceptable
to the Company, shall specify the terms of admission or issuance and shall
include, among other things, the Membership Interest applicable thereto. Any
such admission of a new Member also must comply with the provisions of Section
3.05(d). The provisions of this Section 3.10 shall not apply to Transfers of
Membership Interests.

     3.11 INTERESTS IN A MEMBER.

     (a) A Member that is not a natural person may not cause or permit an
interest, direct or indirect, in itself to be Transferred such that, after the
Transfer, the Company would be considered to have terminated within the meaning
of section 708 of the Code.

     (b) On any breach of the provisions of Section 3.11 (a), the Company shall
have (i) the right to consent to such Transfer, or (ii) the option to buy, and,
on exercise of that option, the breaching Member shall sell, the breaching
Member's Membership Interest, all in accordance with Section 11.01, as if the
breaching Member were a Bankrupt Member.

     3.12 INFORMATION.

     (a) In addition to the other rights specifically set forth in this
Agreement, each Member is entitled to all information to which that Member is
entitled to have access pursuant to the Act under the circumstances and subject
to the conditions therein stated.

     (b) The Members acknowledge that, from time to time, they may receive
information from or regarding the Company or any other Member or its Affiliates
in the nature of trade secrets or secret or proprietary information or
information that is otherwise confidential,

                                       18



<PAGE>   24



the release of which may be damaging to the Company or the Member or its
Affiliates, as applicable, or Persons with which they do business. Each Member
shall hold in strict confidence any information it receives regarding the
Company and may not disclose such information to any Person other than another
Member, except for disclosures (i) to comply with any law, rule, regulation or
order, (ii) to Affiliates, advisers or representatives of the Member or Persons
to which that Member's Membership Interest may be Transferred as permitted by
this Agreement, but only if the recipients of such information have agreed to be
bound by the provisions of this Section 3.12(b), and (iii) of information that a
Member also has received from a source independent of the Company and that such
Member reasonably believes such source obtained such information without breach
of any obligation of confidentiality, (iv) of information obtained prior to the
formation of the Company, (v) to lenders, accountants and other representatives
of the disclosing Member with a need to know such information, provided that the
disclosing Member shall be responsible for such representatives' use and
disclosure of any such information, or (vi) of public information. The Members
acknowledge that a breach of the provisions of this Section 3.12(b) may cause
irreparable injury to the Company or another Member for which monetary damages
are inadequate, difficult to compute, or both. Accordingly, the Members agree
that the provisions of this Section 3.12(b) may be enforced by injunctive action
or specific performance.

     (c) The Members acknowledge that, from time to time, the Company may need
information from any or all of such Members for various reasons, including,
without limitation, for complying with various federal and state regulations.
Each Member shall provide to the Company all information reasonably requested by
the Company within a reasonable amount of time from the date such Member
receives such request; provided, however, that no Member shall be obligated to
provide such information to the Company to the extent such disclosure (i) would
result in the breach or violation of any contractual obligation (if a waiver of
such restriction cannot reasonably be obtained) or Law or (ii) involves secret,
confidential or proprietary information.

     3.13 LIABILITY TO THIRD PARTIES. Except as required by the Act, no Member
shall be liable to any Person (including any third party or to another Member)
(i) as the result of any act or omission of another Member or (ii) for Company
losses, liabilities or obligations (except as otherwise expressly agreed to in
writing by such Member).

     3.14 WITHDRAWAL. Each Member hereby covenants and agrees that it will not
withdraw from the Company as a Member without prior written consent from Members
holding at least a majority of the Membership Interest remaining after excluding
the Membership Interest of the withdrawing Member. A Member which attempts to
withdraw without such written consent shall (i) lose the right to exercise any
of the powers, rights and privileges of a Member would otherwise be entitled and
(ii) remain liable for all obligations and duties as a Member with respect to
such Membership Interest, unless otherwise relieved of such obligations by
unanimous written agreement of all of the other Members.


                                       19


<PAGE>   25


     3.15 LACK OF MEMBER AUTHORITY. No Member has the authority or power to act
for or on behalf of the Company, do any act that would be binding on the
Company, or incur any expenditures on behalf of the Company, unless authorized
to do so in writing by the Company.

     3.16 SECURITY INTEREST OF MEMBERS. Each Member grants to each other Member,
as security, equally and ratably, a Security Interest in such granting Member's
Membership Interest and the proceeds thereof, all under the Uniform Commercial
Code of the State of Texas. The Security Interest secures the performance of all
of the material obligations (including any costs or other expenses incurred in
enforcing same) of such granting Member pursuant to this Agreement. Upon such
granting Member's failure to perform any such obligation, the other Members
shall be entitled to all the rights and remedies of a secured party under the
Uniform Commercial Code of the State of Texas with respect to the Security
Interest granted in this Section; provided, however, that the Security Interest
granted in this Section is subordinate to any indebtedness (including principal
thereof and interest thereon) for borrowed money (including, without limitation,
guarantees thereof) evidenced by a note, credit agreement, indenture or similar
agreement. Each Member shall execute and deliver to the other Members all
financing statements and other instruments that such Members may request to
effectuate and carry out the preceding provisions of this Section. At the option
of any Member, this Agreement or a carbon, photographic, or other copy hereof
may serve as a financing statement. Each Member has the right, in addition to
the other rights and remedies granted to it pursuant to this Agreement or
available to it at law or in equity, to take any action (including, without
limitation, court proceedings and exercising the rights of a secured party under
the Uniform Commercial Code of the State of Texas) that the such Member may deem
appropriate to obtain performance by any other Member of such other Member's
obligations secured by this Section. For purposes of perfecting the Security
Interests granted in or permitted by this Agreement, the Membership Interest
shall be deemed to be a "security" governed by Chapter 8 of the Texas Uniform
Commercial Code and as such term is therein defined in sections 8.102(a)(15) and
8.103(c).

                                   ARTICLE IV.
                              CAPITAL CONTRIBUTIONS

     4.01 INITIAL CAPITAL CONTRIBUTIONS. Each Member shall make the following
Capital Contributions (the "Initial Capital Contributions"):

     (a)  Contributions of non-cash assets set forth in Exhibit A to be made
          contemporaneous with the execution of this Agreement;

     (b)  Contributions of cash by Texaco in an amount as set forth in Exhibit A
          to be made contemporaneous with the execution of this Agreement; and

     (c)  Proportionate contributions of cash by each Member in an amount
          necessary to (i) complete the construction of the Phase I Line and the
          Phase II Line of the Poseidon Pipeline and (ii) fund the purchase
          price or the construction costs


                                       20


<PAGE>   26


          of, as applicable, the Onshore Segment, in each case to be made as
          necessary to allow the Company to timely pay such obligations as they
          become due. Such contributions are currently projected to be needed on
          the dates and in the amounts set forth in Exhibit A, however, if any
          Member determines from time to time in good faith that any such
          Capital Contributions or additional Capital Contributions may be
          necessary and in the best interest of the Company to complete the
          construction or purchase price, as applicable, of the Phase I Line,
          the Phase II Line and the Onshore Segment of the Poseidon Pipeline and
          place same into operational service based on amounts the Company
          expects to be obligated to pay within such time frame, then the Member
          making such determination shall send written notice to the other
          Members specifying (i) the aggregate amount of the Capital
          Contributions reasonably and in good faith deemed necessary by such
          Member and each Member's allocable share thereof and (ii) the date by
          which such additional Capital Contributions shall be made to the
          Company by the Members (which date shall not be less than ten (10)
          Business Days from the date on which the notice is sent). Each Member
          shall thereafter contribute cash to the Company in an amount equal to
          such Member's allocable share of the amount of the Capital
          Contribution on or before the date specified in such notice. All
          Initial Capital Contributions consisting of cash shall be held in an
          account until such time as such funds are used to fund the
          construction costs or purchase price, as applicable, of the Phase I
          Line, the Phase II Line and the Onshore Segment of the Poseidon
          Pipeline except to the extent that all of the Members agree that the
          applicable portion of any such Initial Capital Contribution is no
          longer needed to finance such construction costs or the operations of
          the Company.

     4.02 SUBSEQUENT CONTRIBUTIONS. Unless unanimously agreed to in writing by
the Members, no Member shall be required to make any Capital Contributions other
than the Initial Capital Contributions as contemplated by Section 4.01.

     4.03 FAILURE TO CONTRIBUTE.

     (a) If a Member does not contribute by the time required all or any portion
of a Capital Contribution such Member ("Delinquent Member") is required to make
as provided in this Agreement, the Company (by vote of at least a majority of
the Membership Interest remaining after excluding the Membership Interest of
the Delinquent Member) may exercise, on written notice to such Delinquent
Members, one or more of the following remedies:

          (i) taking such action (including, without limitation, court
     proceedings) as the Company may deem appropriate to obtain payment by the
     Delinquent Member of the portion of the Delinquent Member's Capital
     Contribution that is in default, along with the costs and expenses
     associated with the collection of such Delinquent Member's Capital
     Contribution;

                                       21


<PAGE>   27


          (ii) permitting the other Members in proportion to their Membership
     Interest or in such other percentages as they may agree (the "Lending
     Member," whether one or more), to advance the portion of the Delinquent
     Member's Capital Contribution that is in default, with the following
     results:

               (1) the sum advanced constitutes a loan from the Lending Member
          to the Delinquent Member and a Capital Contribution of that sum to the
          Company by the Delinquent Member pursuant to the applicable provisions
          of this Agreement,

               (2) the principal balance of the loan and all accrued unpaid
          interest thereon (collectively, the "Obligation") is due and payable
          in whole on the tenth Business Day after the day written demand
          requesting payment of the Obligation is made by the Lending Member to
          the Delinquent Member,

               (3) the amount lent bears interest at the Default Interest Rate
          from the date on which the advance is deemed made until the date that
          the loan, together with all interest accrued thereon and all costs and
          expenses associated therewith ("Costs"), is repaid to the Lending
          Member,

               (4) all distributions from the Company that otherwise would be
          made to the Delinquent Member (whether before or after dissolution of
          the Company) instead shall be paid to the Lending Member until the
          Obligation and any Costs have been paid in full to the Lending Member
          (with payments being applied first to accrued and unpaid interest,
          second to Costs, and finally to principal),

               (5) the payment of the Obligation and Costs is secured by a
          Security Interest in the Delinquent Member's Membership Interest, as
          more fully set forth in Section 4.03(b), and

               (6) the Lending Member has the right, in addition to the other
          rights and remedies granted to it pursuant to this Agreement or
          available to it at law or in equity, to take any action (including,
          without limitation, court proceedings and exercising the rights of a
          secured party under the Uniform Commercial Code of the State of Texas)
          that the Lending Member may deem appropriate to obtain payment from
          the Delinquent Member of the Obligation and all Costs; or

          (iii) exercising any other rights and remedies available at law or in
     equity; or

          (iv) the other Members (by affirmative vote of at least a majority of
     the Membership Interests held by such other Members) may elect to make any
     such unpaid Capital Contributions to the Company and adjust the Membership
     Interest for each Member to equal the percentage obtained by dividing (A)
     the Capital Account of such


                                       22


<PAGE>   28


     Member (including any Capital Contribution made by such Member under this
     Section) by (B) the aggregate Capital Accounts of all Members (including
     all Capital Contributions made under this Section). Upon the adjustment of
     the Membership Interests in the manner set forth in the preceding
     sentence, Exhibit A shall be deemed to be amended to reflect such adjusted
     Membership Interests.

     (b) Each Member grants to the Company and to each Lending Member with
respect to any Obligation and Costs owed to such Lending Member by that Member
as Delinquent Member pursuant to Section 4.03(a)(ii), as security, equally and
ratably, a Security Interest its Membership Interest and the proceeds thereof,
all under the Uniform Commercial Code of the State of Texas. The Security
Interest secures the payment of all Capital Contributions such Member has agreed
to make and the payment of any Obligation and Costs owed to a Lending Member by
such Member as a Delinquent Member pursuant to Section 4.03(a)(ii). On any
default in the payment of a Capital Contribution or in the payment of any
Obligation or Costs, the Company or the Lending Member, as applicable, is
entitled to all the rights and remedies of a secured party under the Uniform
Commercial Code of the State of Texas with respect to the Security Interest
granted in this Section 4.03(b). Each Member shall execute and deliver to the
Company and the Lending Member, as applicable, all financing statements and
other instruments that the Company or the Lending Member, as applicable, may
request to effectuate and carry out the preceding provisions of this Section
4.03(b). At the option of the Company or Lending Member, as applicable, this
Agreement or a carbon, photographic, or other copy hereof may serve as a
financing statement.

     (c) In addition to the remedies set forth above in this Section 4.03, if
any Member is in Default with respect to the payment of any Initial Capital
Contribution, then the other Members (by affirmative vote of at least a majority
of the Membership Interests held by such other Members) may expel the Member in
Default from the Company and such other Members may purchase (in such
percentages as may be determined by such other Members), or cause the Company to
purchase, the Membership Interest of the Member in Default, as of the expulsion
date, at a price equal to the greater of $1.00 or the balance in the Capital
Account of the Member in Default as shown by the Company's books immediately
prior to the purchase less (A) all costs incurred or reasonably anticipated to
be incurred by the Company and the other Members to remedy the Default and (B)
all damages to the Company or the other Members resulting from such Default by
giving written notice specifying the expulsion date and purchase. It is the
intent of the parties to this Agreement that upon such expulsion and purchase,
the Company shall continue to exist and operate without interruption,
dissolution or termination, and without impairing or reducing in any way its
rights and obligations to third parties.

     4.04 RETURN OF CONTRIBUTIONS. A Member is not entitled (i) to the return of
any part of any Capital Contributions other than any preferential or
disproportionate distributions to the extent such distributions are expressly
provided for in this Agreement (including those set forth in Sections 5.04 and
12.02(c)(iii) or (ii) to be paid interest in respect of either its Capital
Account or its Capital Contributions. Except as provided in Section 4.03(a)(ii),
an unrepaid Capital Contribution is not a liability of the Company or of any
Member. A Member is not

                                       23



<PAGE>   29


required to contribute or to lend any cash or property to the Company to enable
the Company to return any other Member's Capital Contributions.

     4.05 ADVANCES BY MEMBERS. If any Member makes a determination in good faith
and it is reasonably necessary and in the best interest of the Company for the
continued viable operation of the Company because failure to obtain additional
funds would cause an imminent material default of a commercial loan or of a
material contract related to the construction and/or operation of the Poseidon
Pipeline, any Member may propose that the Members make additional Capital
Contributions to the Company by giving notice in writing to the other Members.
Each Member shall notify the Company within five (5) Business Days of the date
such notice is given as to whether such Member elects or declines to make any
additional Capital Contribution requested by a Member pursuant to this Section
4.05 (an "Additional Capital Contribution"). If any Member (a "Declining
Member") declines to make an Additional Capital Contribution or fails to give
timely notice to the Company in accordance with this Section 4.05, the Members
agreeing to make such Additional Capital Contributions (the "Advancing Members")
may elect one of the following:

          (i) The Advancing Members may advance the unpaid portion of the
     Additional Capital Contribution to the Company on behalf of the Declining
     Member with the results as described in Section 4.03(a)(ii); or

          (ii) The Advancing Members may advance the aggregate amount of the
     requested Additional Capital Contribution to or on behalf of the Company.
     An advance described in this Section 4.05(ii) constitutes a loan from the
     Advancing Member to the Company and shall bear interest at the Default
     Interest Rate and be repayable prior to any distributions to the Members.

     4.06 CAPITAL ACCOUNTS. A separate capital account ("Capital Account") shall
be established and maintained for each Member in accordance with the rules of
Treasury Regulation section 1.704-1(b)(2)(iv) and the following terms and
conditions:

     (a) Each Member's Capital Account shall be (i) increased by (A) the amount
of cash or cash equivalents contributed by that Member to the Company as capital
(B) the Net Agreed Value of property contributed by that Member to the Company
as capital, (C) the amount of any loans transferred by such Member to its
Capital Account pursuant to Section 4.07 (contributions contemplated by
subparagraphs (A), (B) and (C) shall be referred to as "Capital Contributions"),
and (D) allocations to that Member of Company income and gain (or items
thereof), including, without limitation, income and gain exempt from tax and
income and gain described in Treasury Regulation section 1.704-1(b)(2)(iv)(g),
but excluding income and gain described in Treasury Regulation section
1.704-1(b)(4)(i); and (ii) shall be decreased by (A) the amount of cash or cash
equivalents distributed to that Member by the Company, (B) the Net Agreed Value
of property distributed to that Member by the Company, and (C) allocations of
Company losses and deductions (or items thereof), including losses and
deductions described in

                                       24


<PAGE>   30


Treasury Regulation section 1.704-1(b)(2)(iv)(g) (but excluding losses or
deductions described in Treasury Regulation section 1.704-1(b)(4)(i) or (iii)),

     (b) For purposes of computing the amount of any item of income, gain,
loss or deduction to be reflected in the Members' Capital Accounts, the
determination, recognition and classification of any such item shall be the same
as its determination, recognition and classification for federal income tax
purposes (including, without limitation, any method of depreciation, cost
recovery or amortization used for that purpose), provided that:

          (i) All fees and other expenses incurred by the Company to promote the
     sale of (or to sell) any interest that can neither be deducted nor
     amortized under section 709 of the Code, if any, shall, for purposes of
     Capital Account maintenance, be treated as an item of deduction at the time
     such fees and other expenses are incurred and shall be allocated among the
     Members pursuant to Sections 5.01 and 5.02.

          (ii) Except as otherwise provided in Treasury Regulation section
     1.704-1(b)(2)(iv)(m), the computation of all items of income, gain, loss
     and deduction shall be made without regard to any election under section
     754 of the Code which may be made by the Company and, as to those items
     described in section 705(a)(1)(B) or 705(a)(2)(B) of the Code, without
     regard to the fact that such items are not includable in gross income or
     are neither currently deductible nor capitalized for federal income tax
     purposes.

          (iii) Any income, gain or loss attributable to the taxable disposition
     of any Company property shall be determined as if the adjusted basis of
     such property as of such date of disposition were equal in amount to the
     Company's Carrying Value with respect to such property as of such date.

          (iv) In accordance with the requirements of section 704(b) of the
     Code, any deductions for depreciation, cost recovery or amortization
     attributable to any Contributed Property shall be determined as if the
     adjusted basis of such property on the date it was acquired by the Company
     was equal to the Agreed Value of such property on the date it was acquired
     by the Company. Upon an adjustment pursuant to Section 4.06(d) to the
     Carrying Value of any Company property subject to depreciation, cost
     recovery or amortization, any further deductions for such depreciation,
     cost recovery or amortization attributable to such property shall be
     determined (A) as if the adjusted basis of such property were equal to the
     Carrying Value of such property immediately following such adjustment and
     (B) using a rate of depreciation, cost recovery or amortization derived
     from the same method and useful life (or, if applicable, the remaining
     useful life) as is applied for federal income tax purposes; provided,
     however, that if the asset has a zero adjusted basis for federal income tax
     purposes, depreciation, cost recovery or amortization deductions shall be
     determined using any reasonable method that the Company may adopt.

                                       25

<PAGE>   31


     (c) A transferee shall succeed to the Capital Account of the Transferor
relating to the Membership Interest so Transferred; provided, however, that if
the Transfer causes a termination of the Company under section 708(b)(1)(B) of
the Code, the Company's properties shall be deemed to have been distributed in
liquidation of the Company to the Members (including any transferee of a
Membership Interest that is a party to the Transfer causing such termination)
pursuant to Section 12.02 and recontributed by such Members in reconstitution of
the Company. Any such deemed distribution shall be treated as an actual
distribution for purposes of this Section 4.06. In such event the Carrying
Values of the Company properties shall be adjusted immediately prior to such
deemed distribution pursuant to Section 4.06(d)(ii) and such Carrying Values
shall then constitute the fair market values of such properties upon such deemed
contribution to the reconstituted Company for the purposes of determining the
Agreed Value and otherwise. The Capital Accounts of such reconstituted Company
shall be maintained in accordance with the principles of this Section 4.06.

     (d)(i) Consistent with the provisions of Treasury Regulation section
1.704-1(b)(2)(iv)(f), on an issuance of additional Membership Interests for cash
or Contributed Property, the Capital Accounts of all Members and the Carrying
Value of each Company property immediately prior to such issuance shall be
adjusted upward or downward to reflect any Unrealized Gain or Unrealized Loss
attributable to such Company property, as if such Unrealized Gain or Unrealized
Loss had been recognized on an actual sale of each such property immediately
prior to such issuance and had been allocated to the Members at such time
pursuant to Section 5.01.

          (ii) In accordance with Treasury Regulation section
1.704-1(b)(2)(iv)(f), immediately prior to any distribution to a Member of any
Company property (other than a distribution of cash or cash equivalents that are
not in redemption or retirement of a Membership Interest), the Capital Accounts
of all Members and the Carrying Value of each Company property shall be adjusted
upward or downward to reflect any Unrealized Gain or Unrealized Loss
attributable to such Company property, as if such Unrealized Gain or Unrealized
Loss had been recognized in a sale of such property immediately prior to such
distribution for an amount equal to its fair market value (which shall be
determined by the Company using any valuation method it deems reasonable under
the circumstances), and had been allocated to the Members at such time, pursuant
to Section 5.01.

     4.07 CAPITALIZATION OF LOANS. Initially, a loan by any Member to another
Member or the Company as contemplated by Section 4.03(a)(ii) or 4.05 shall not
be considered a Capital Contribution and shall not increase the Capital Account
balance of the Advancing Member. Notwithstanding the foregoing, in the event the
principal and interest of any such loan has not been repaid within one (1) year
from the date of the loan, the Advancing Member, at any time thereafter by
giving written notice to the Company, may elect to have the unpaid principal and
interest balance of such loan transferred to and increase such Member's Capital
Account Upon such transfer, the loan shall be treated as a Capital Contribution
and the Membership Interest for each Member shall be adjusted to equal the
percentage obtained by dividing (A) the Capital Account of such Member
(including any Capital Contribution made on behalf of another Member)


                                       26


<PAGE>   32

by (B) the aggregate Capital Accounts of all Members (including all Capital
Contributions made on behalf of other Members).

                                   ARTICLE V.
                          ALLOCATIONS AND DISTRIBUTIONS

     5.01 ALLOCATIONS FOR CAPITAL ACCOUNT PURPOSES. For purposes of maintaining
the Capital Accounts and in determining the rights of the Members among
themselves, the Company's items of income, gain, loss and deduction (computed in
accordance with Section 4.06(b)) shall be allocated among the Members in each
taxable year (or portion thereof) as provided herein below.

     (a) Net Income. All items of income, gain, loss and deduction taken into
account in computing Net Income for such taxable period shall be allocated to
each of the Members in accordance with its respective Membership Interests.

     (b) Net Losses. All items of income, gain, loss and deduction taken into
account in computing Net Losses for such taxable period shall be allocated to
each Member in accordance with its respective Membership Interests; provided,
however, that Net Losses shall not be allocated pursuant to this Section 5.01(b)
to the extent that such allocation would cause a Member to have a deficit
balance in its Adjusted Capital Account at the end of such taxable year (or
increase any existing deficit balance in its Adjusted Capital Account).

     (c) Nonrecourse Liabilities. For purposes of Treasury Regulation section
1.752-3(a)(3), the Members agree that Nonrecourse Liabilities of the Company in
excess of the sum of (A) the amount of Company Minimum Gain and (B) the total
amount of Nonrecourse Built-in Gain shall be allocated among the Members in
accordance with their respective Membership Interests.

     (d) Company Minimum Gain Chargeback. Notwithstanding the other provisions
of this Section 5.01, except as provided in Treasury Regulation section
1.704-2(f)(2) through (5), if there is a net decrease in Company Minimum Gain
during any Company taxable period, each Member shall be allocated items of
Company income and gain for such period (and, if necessary, subsequent periods)
in the manner and amounts provided in Treasury Regulation sections 1.704-2(f)(6)
and (g)(2) and section 1.704-2(j)(2)(i), or any successor provisions. For
purposes of this Section 5.01 (d), each Member's Adjusted Capital Account
balance shall be determined, and the allocation of income or gain required
hereunder shall be effected, prior to the application of any other allocations
pursuant to this Section 5.01 with respect to such taxable period (other than an
allocation pursuant to Section 5.01(h) or (i)).

     (e) Chargeback of Minimum Gain Attributable to Member Nonrecourse Debt.
Notwithstanding the other provisions of this Section 5.01 (other than Section
5.01(d), except as provided in Treasury Regulation section 1.704-2(i)(4)), if
there is a net decrease in Minimum

                                       27


<PAGE>   33


Gain Attributable to Member Nonrecourse Debt during any Company taxable period,
any Member with a share of Minimum Gain Attributable to Member Nonrecourse Debt
at the beginning of such taxable period shall be allocated items of Company
income and gain for such period (and, if necessary, subsequent periods) in the
manner and amounts provided in Treasury Regulation sections 1.704-2(i)(4) and
1.704-2(j)(2)(ii), or any successor provisions. For purposes of this Section
5.01, each Member's Adjusted Capital Account balance shall be determined and the
allocation of income or gain required hereunder shall be effected, prior to the
application of any other allocations pursuant to this Section 5.01, other than
Sections 5.01(d), (h) and (i), with respect to such taxable period.

     (f) Qualified Income Offset. In the event any Member unexpectedly receives
adjustments, allocations or distributions described in Treasury Regulation
section 1.704-1(b)(2)(ii)(d)(4) through (6) (or any successor provisions), items
of Company income and gain shall be specifically allocated to such Member in an
amount and manner sufficient to eliminate, to the extent required by the
Treasury Regulations promulgated under section 704(b) of the Code, the deficit
balance, if any, in its Adjusted Capital Account created by such adjustments,
allocations or distributions as quickly as possible unless such deficit balance
is otherwise eliminated pursuant to Section 5.01(d) or 5.01(e).

     (g) Gross Income Allocations. In the event any Member has a deficit balance
in its Adjusted Capital Account at the end of any Company taxable period which
is in excess of the sum of (i) the amount such Member is obligated to restore
pursuant to any provision of this Agreement and (ii) the amount such Member is
deemed obligated to restore pursuant to the penultimate sentences of Treasury
Regulations sections 1.704-2(g)(1) and 1.704-2(i)(5), such Member shall be
specifically allocated items of Company gross income and gain in the amount of
such excess as quickly as possible; provided that an allocation pursuant to this
Section 5.01(g) shall be made only if and to the extent that such Member would
have a deficit balance in its Adjusted Capital Account after all other
allocations provided in this Section 5.01 have been tentatively made as if this
Section 5.01(g) was not in the Agreement.

     (h) Nonrecourse Deductions. Nonrecourse Deductions for any taxable period
shall be allocated to the Members in accordance with their respective Membership
Interests. If the Company determines in its good faith discretion that the
Company's Nonrecourse Deductions must be allocated in a different ratio to
satisfy the safe harbor requirements of the Treasury Regulations promulgated
under section 704(b) of the Code, the Company is authorized, upon notice to the
Members, to revise the prescribed ratio to the numerically closest ratio which
does satisfy such requirements.

     (i) Member Nonrecourse Deductions. Member Nonrecourse Deductions for any
taxable period shall be allocated 100% to the Member that bears the Economic
Risk of Loss for such Member Nonrecourse Debt to which such Member Nonrecourse
Deductions are attributable in accordance with Treasury Regulation section
1.704-2(i) (or any successor provision). If more than one Member bears the
Economic Risk of Loss with respect to a Member Nonrecourse Debt,

                                       28


<PAGE>   34


such Member Nonrecourse Deductions attributable thereto shall be allocated
between or among such Members ratably in proportion to their respective shares
of such Economic Risk of Loss.

     5.02 ALLOCATIONS FOR TAX PURPOSES.

     (a) Except as otherwise provided herein, for federal income tax purposes,
each item of income, gain, loss and deduction which is recognized by the Company
for federal income tax purposes shall be allocated among the Members in the same
manner as its correlative item of "book" income, gain, loss or deduction is
allocated pursuant to Section 5.01 hereof.

     (b) In an attempt to eliminate Book-Tax Disparities attributable to a
Contributed Property or Adjusted Property, items of income, gain, loss,
depreciation, amortization and cost recovery deductions shall be allocated for
federal income tax purposes among the Members as follows:

          (i) (A) In the case of a Contributed Property, such items attributable
     thereto shall be allocated among the Members in the manner provided under
     section 704(c) of the Code and section 1.704-3(b) of the Treasury
     Regulations (i.e. the "traditional method") that takes into account the
     variation between the Agreed Value of such property and its adjusted basis
     at the time of contribution; and (B) except as otherwise provided in
     Section 5.02(b)(iii), any item of Residual Gain or Residual Loss
     attributable to a Contributed Property shall be allocated among the Members
     in the same manner as its correlative item of "book" gain or loss is
     allocated pursuant to Section 5.01.

          (ii) (A) In the case of an Adjusted Property, such items shall (1)
     first, be allocated among the Members in a manner consistent with the
     principles of section 704(c) of the Code and section 1.704-3(b) of the
     Treasury Regulations (i.e. the "traditional method") to take into account
     the Unrealized Gain or Unrealized Loss attributable to such property and
     the allocations thereof pursuant to Section 4.06(d)(i) or (ii), and (2)
     second, in the event such property was originally a Contributed Property,
     be allocated among the Members in a manner consistent with Section
     5.02(b)(i); and (B) except as otherwise provided in Section 5.02(b)(iii),
     any item of Residual Gain or Residual Loss attributable to an Adjusted
     Property shall be allocated among the Members in the same manner as its
     correlative item of "book" gain or loss is allocated pursuant to Section
     5.01.

          (iii) Any items of income, gain, loss or deduction otherwise allocable
     under Section 5.02(b)(i)(B) or 5.02(b)(ii)(B) shall be subject to
     allocation by the Company in a manner designed to eliminate, to the maximum
     extent possible, Book-Tax Disparities in a Contributed Property or Adjusted
     Property otherwise resulting from the application of the "ceiling"
     limitation (under section 704(c) of the Code or section 704(c) principles)
     to the allocations provided under Sections 5.02(b)(i)(A) and
     5.02(b)(ii)(A).

                                       29


<PAGE>   35


     (c) For the proper administration of the Company, the Company shall (i)
adopt such conventions as it deems appropriate in determining the amount of
depreciation, amortization and cost recovery deductions; (ii) make special
curative allocations for federal income tax purposes of income (including,
without limitation, gross income) or deductions pursuant to section 1.704 3(c)
of the Treasury Regulations to eliminate the impact of the "ceiling" limitation
(under section 704(c) of the Code as Section 704 principles) to the allocations
provided in Section 5.02(b); and (iii) amend the provisions of this Agreement as
appropriate to reflect the proposal or promulgation of Treasury Regulations
under section 704(b) or section 704(c) of the Code. The Company may adopt such
conventions, make such allocations and make such amendments to this Agreement as
provided in this Section 5.02(c) only if such conventions, allocations or
amendments are consistent with the principles of section 704 of the Code.

     (d) The Company may determine to depreciate the portion of an adjustment
under section 743(b) of the Code attributable to unrealized appreciation in any
Adjusted Property (to the extent of the unamortized Book-Tax Disparity) using a
predetermined rate derived from the depreciation method and useful life applied
to the Company's common basis of such property, despite the inconsistency of
such with Proposed Treasury Regulation section 1.168-2(n) and Treasury
Regulation section 1.167(c)-l(a)(6), or any successor provisions. If the Company
determines that such reporting position cannot reasonably be taken, the Company
may adopt any reasonable depreciation convention that would not have a material
adverse effect on the Members.

     (e) Any gain allocated to the Members upon the sale or other taxable
disposition of any Company asset shall, to the extent possible, after taking
into account other required allocations of gain pursuant to this Section 5.02
be characterized as Recapture Income in the same proportions and the same extent
as such Members (or their predecessors in interest) have been allocated any
deductions directly or indirectly giving rise to the treatment of such gains as
Recapture Income.

     (f) All items of income, gain, loss, deduction and credit recognized by the
Company for federal income tax purposes and allocated to the Members in
accordance with the provisions hereof shall be determined without regard to any
election under section 754 of the Code which may be made by the Company;
provided, however, that such allocations, once made, shall be adjusted as
necessary or appropriate to take into account those adjustments permitted or
required by sections 734 and 743 of the Code.

     5.03 REQUIREMENT OF DISTRIBUTIONS. Subject to the provisions of Sections
5.06 and 7.02, and after the establishment of any reserve set aside pursuant to
Section 5.05, the Company shall distribute (within 30 days following the end of
each calendar month) such amount of Available Cash as determined by the Members,
to the Members who were Record Holders as of the Record Date in accordance with
their respective Membership Interest.

     5.04 PRO RATA DISTRIBUTIONS. Except for preferential or disproportionate
distributions to the extent expressly provided for in this Agreement (including
those set forth in Section 12.02),

                                       30


<PAGE>   36


any distributions on the Membership Interest of the Company paid in cash,
property, or equity ownership of the Company shall be allocated pro rata
according to Membership Interest.

     5.05 RESERVES. Before payment of any Distributions, there may be set aside
out of any funds of the Company available for distributions such sum or sums as
the Company from time to time, in its absolute discretion, thinks proper as a
reserve or reserves to meet contingencies, for repairing or maintaining any
property of the Company, or for such other purpose as the Company shall
determine to be in the best interest of the Company; and the Company may modify
or abolish any such reserve in the manner in which it was created.

     5.06 DISTRIBUTION RESTRICTIONS. Unless unanimously agreed to in writing by
the Members, the Company shall not distribute (i) any of the Initial Capital
Contributions until the completion of the construction of the Phase I Line and
the Phase II Line of the Poseidon Pipeline, except to the extent that all of the
Members agree that the applicable portion of such Initial Capital Contributions
is no longer needed to finance such construction or the operations of the
Company, or (ii) any amounts that would cause the Company to materially breach,
or would create a material default under, any debt agreements or instruments to
which the Company is a party.

                                   ARTICLE VI.
                            MANAGEMENT OF THE COMPANY

     6.01 MANAGEMENT BY THE MEMBERS AND DELEGATION OF AUTHORITY. The Members
hereby unanimously agree that the business and affairs of the Company shall be
managed by or under the authority of the Members in accordance with the Act,
which Members may act through their directors, officers, employees,
representatives, agents and designees. Except for situations in which the
approval of the Members is required by this Agreement or by nonwaivable
provisions of applicable law, the Members shall have broad discretion to
authorize any committee constituted pursuant to Section 6.02 or any officer or
other agent to act on behalf of the Company.

     6.02 COMMITTEES.

     (a) For organizational purposes, the Members may form one or more
committees of the Members, including, without limitation, (i) a "Management
Committee" responsible for the planning and oversight of the policies and
strategies of the Company and any other actions not expressly delegated to
another committee, body, officer or other representative of the Company, (ii) a
"Business Development Committee" responsible for the planning and oversight of
specific business development projects as stated in Section 6.02(b), and (iii)
an "Operating Committee" responsible for the oversight and control of the
physical operations and maintenance of the Poseidon Pipeline, and (iv) such
other committees as the Members or the Management Committee may desire from time
to time. Each Member shall appoint one (or more) of its duly authorized agents
to act for the Member of any committee of the Members. One such agent of

                                       31


<PAGE>   37


each Member shall be given the authority by such Member to vote on behalf of the
Member on any issue within the committee's responsibility.

     (b) The Business Development Committee shall meet at least annually and at
such other regular or special meetings at times and locations reasonably
acceptable to its participating representatives. At each annual meeting, the
representatives of the Business Development Committee shall set the general
terms and conditions pursuant to which the Company would be willing to enter
into Oil Contracts during the immediately succeeding calendar year, which
general terms and conditions shall include, without limitation, minimum and
maximum purchase and resale differentials and other applicable rates applicable
to such calendar year, and shall continue to be effective until replaced by new
terms approved by the Business Development Committee. Any representative of the
Business Development Committee may request such committee to review the maximum
and minimum purchase and resale differentials and other applicable rates
applicable to the current calendar year if such representative has information
or data evidencing that market conditions have changed materially since such
rates were set or that such rates are materially inappropriate.

     (c) Under the oversight of the Business Development Committee, the
representatives of the Members jointly shall conduct the business development
activities of the Company, including, without limitation, identifying and
negotiating with potential customers. Each Member shall use all reasonable
efforts to ensure that its representatives cooperate with and keep informed the
representatives of the other Members with respect to any business development
activities conducted by such representative. Each such representative may
independently approach any potential customer or other Person and discuss such
potential arrangements; provided, however, that no such representative may
submit any formal proposal to a potential customer without consulting with
representatives of the other Members. The Business Development Committee shall
have the authority to reconsider the business development procedures and
arrangements on an annual calendar year basis beginning with the calendar year
commencing on January 1, 1998. The Company shall reimburse each Member
(including its officers, agents and other representatives) for reasonable costs
associated with business development services performed pursuant to this
Agreement.

     6.03 AUTHORITY OF MEMBERS AND COMMITTEES. (a) With respect to conflicts or
disagreements between and among any committees, the Management Committee shall
have ultimate decision making authority. The Members and the committees shall
act through the Company's officers, employees, representatives, agents and
designees. No Member shall have individual authority to bind the Company unless
such is expressly conferred upon them pursuant to this Agreement or by action of
the Members or a duly authorized committee, body, officer or other
representative. All action shall be taken subsequent to resolutions approved by
the Members in accordance with Article VII of this Agreement.

     (b) Unless otherwise expressly delegated in writing or provided by this
Agreement, the Members hereby reserve to the Members as a group the authority to
authorize and approve the following:

                                       32


<PAGE>   38


          (i) acquiring and disposing of, and utilizing for Company purposes,
     any material asset of the Company;

          (ii) borrowing money;

          (iii) determining the reserve applicable to distributions of Company
     cash and other property as provided in Section 5.03;

          (iv) authorizing transactions not in the ordinary course of business;

          (v) permitting the Company to merge, consolidate, participate in a
     share exchange or other statutory reorganization with, or sell all or
     substantially all of the assets of the Company to, any Person;

          (vi) permitting the Company to dissolve and liquidate;

          (vii) approving any operating and capital expenditures budgets for the
     Company;

          (viii) permitting a Member to withdraw from the Company;

          (ix) entering into contracts, agreements and other undertakings
     binding the Company to pay more than $500,000 in any year or $1,000,000 in
     the aggregate pursuant to any such individual contract, agreement or
     undertaking that may be necessary, appropriate, or advisable in furtherance
     of the purposes of the Company;

          (x) entering into Oil Contracts with a term of one year or more; and

          (xi) authorizing the Company to enter into a transaction involving a
     Lateral Opportunity in accordance with Article XI.

     With respect to each such matter described in (i) - (xi) above, exercise of
such authority shall occur only by the affirmative vote of the applicable
Membership Interest as required by the Agreement, including the Majority
Interest voting requirements set forth in Section 7.01(a), the Super-Majority
Interest voting requirements set forth in Section 7.02 and the unanimous
Membership Interest voting requirements otherwise set forth in this Agreement,
as applicable.

     (c) Member approval of or agreement to any matter specified in Section
6.03(b)(i), (ii), (iv), (v), (vi) or (viii) may be withheld by any Member for
any reason whatsoever. Approval of or agreement to any other matter will not be
withheld by any Member (whether acting directly through such Member or any
committee) without a reasonable basis.

                                       33


<PAGE>   39

     6.04 OFFICERS.

     (a) The Members or the Management Committee may designate one or more
Persons to one or more officer positions of the Company. Such officers may
include, without limitation, Chief Executive Officer, Chief Financial Officer,
President, Vice President, Treasurer, Assistant Treasurer, Secretary and
Assistant Secretary. No officer need be a resident of the State of Delaware. The
Members or the Management Committee may assign titles to particular officers.
Each officer shall hold office until his successor shall be duly designated and
shall qualify to hold such office, or until his death or until he shall resign
or shall have been removed in the manner hereinafter provided. Any number of
offices may be held by the same Person. The salaries or other compensation, if
any, of the officers and agents of the Company may be fixed from time to time by
the Members. Notwithstanding any other provisions of this Agreement, the
authority of any officers or agents of the Company shall be restricted to the
carrying on of the day-to-day affairs of the Company and any such authority
shall be subject to the supervisory control of the Members. Only Members or
their duly authorized agents shall have the authority to make policy decisions
for the Company. Unless the Members or the Management Committee decide
otherwise, the assignment of such title shall constitute the delegation to such
officer of the authority and duties set forth below and those that are normally
associated with that office:

          (i) Chief Executive Officer. The Chief Executive Officer shall
     generally and actively manage the business of the Company and shall see
     that all orders and resolutions of the Members and its Committees are
     carried into effect. The Chief Executive Officer shall only report to the
     Management Committee.

          (ii) President. Unless otherwise specified by the Members or the
     Management Committee, the President shall be the chief operating officer of
     the Company and have general executive powers to manage the operations of
     the Company, and such other powers and duties as this Agreement, the
     Members or the Management Committee may from time to time prescribe. In the
     absence of the Chief Executive Officer or in the event of his inability or
     refusal to act, the President shall perform the duties and exercise the
     powers of the Chief Executive Officer.

          (iii) Chief Financial Officer. The Chief Financial Officer shall be
     the principal financial officer of the Company and shall have such powers
     and perform such duties as this Agreement, the Members or the Management
     Committee may from time to time prescribe.

          (iv) Vice Presidents. In the absence of the President, or in the event
     of his inability or refusal to act, the Vice President (or in the event
     there be more than one Vice President, the Vice Presidents in the order
     designated by the Members or the Management Committee, or in the absence of
     any such designation, then in the order of their election or appointment)
     shall perform the duties of the President, and when so

                                       34

<PAGE>   40


     acting, shall have all the powers of and be subject to all the restrictions
     upon the President.

          (v) Secretary. The Secretary shall keep the minutes of the meetings of
     the Company and of the Management Committee, and shall exercise general
     supervision over the files of the Company. The Secretary shall give notice
     of meetings and shall perform other duties commonly incident to such
     office.

          (vi) Assistant Secretary. At the request of the Secretary or in the
     Secretary's absence or inability to act, the Assistant Secretary shall
     perform part or all of the Secretary's duties.

          (vii) Treasurer. The Treasurer shall have general supervision of the
     funds, securities, notes, drafts, acceptances, and other commercial paper
     and evidences of indebtedness of the Company and he shall determine that
     funds belonging to the Company are kept on deposit in such banking
     institutions as the Members or the Management Committee may from time to
     time direct. The Treasurer shall determine that accurate accounting records
     are kept, and the Treasurer shall render reports of the same and of the
     financial condition of the Company to the Members or the Management
     Committee at any time upon request. The Treasurer shall perform other
     duties commonly incident to such office, including, but not limited to, the
     execution of tax returns.

          (viii) Assistant Treasurer. At the request of the Treasurer or in the
     Treasurer's absence or inability to act, the Assistant Treasurer shall
     perform part or all of the Treasurer's duties.

     (b) Any officer may resign as such at any time. Such resignation shall be
made in writing and shall take effect at the time specified therein, or if no
time be specified, at the time of its receipt by the Company. The acceptance of
a resignation shall not be necessary to make it effective, unless expressly so
provided in the resignation. Any officer may be removed as such, either with or
without cause, by the Members; provided, however, that such removal shall be
without prejudice to the contract rights, if any, of the officer so removed.
Designation of an officer shall not of itself create contract rights. Any
vacancy occurring in any office of the Company may be filled by the applicable
Committee or the Members.

     6.05 DUTIES OF OFFICERS. Each officer shall devote such time, effort, and
skill to the Company's business affairs as he deems necessary and proper for the
Company's welfare and success. The Members expressly recognize that the officers
have substantial other business relationships and activities with Persons other
than the Company.

     6.06 NO DUTY TO CONSULT. Except as otherwise provided herein or by
applicable law, neither the Company nor its duly appointed agents, designees or
representatives or the officers of the Company shall have a duty or obligation
to consult with or seek the advice of the Members on any matter relating to the
day-to-day business affairs of the Company duly delegated to such


                                       35

<PAGE>   41
Persons; provided, however, that such Persons shall not be restricted from
consulting with or the seeking the advice of the Members.

     6.07 REIMBURSEMENT. All expenses incurred with respect to the organization,
operation and management of the Company shall be borne by the Company.

     6.08 MEMBERS AND AFFILIATES DEALING WITH THE COMPANY. Subject to obtaining
any consent expressly required hereunder, the Company may appoint, employ,
contract, or otherwise deal with any Person, including Affiliates of the
Members, individuals with whom the Members are otherwise related, and with
business entities which have a financial interest in a Member or in which a
Member has a financial interest, for transacting Company business, including any
acts or services for the Company as the members of any committee, officer or
other representative with the proper authority may approve.

     6.09 INSURANCE. The Members and the Company agree to maintain for the
benefit of the Company and the Members and at the their sole expense the
insurance coverage described on "Exhibit C" hereto and such other insurance as
may be required by Law and any commercial lender. Promptly upon request of the
Company or any Member, the Company and each Member agree to provide an insurance
certificate evidencing the coverage required by this Section. If a Member does
not maintain insurance or provide an insurance certificate as required by this
Agreement ("Delinquent Insurance Member"), then the other Members (the "Insuring
Members") may acquire or maintain insurance to satisfy the Delinquent Insurance
Member's obligation. The cost for the Insuring Members to acquire or maintain
insurance to satisfy the obligations of the Delinquent Insurance Member shall be
reimbursed by the payment by the Company of such amounts to the Insuring Members
out of any distributions payable to the Delinquent Insurance Member, and any
such Delinquent Insurance Member hereby directs the Company to make such
payments on its behalf. Each such person shall be named as an additional insured
on the policies carried by the other person. The costs of the insurance required
to be carried by the Company pursuant to this Section 6.09 shall automatically
be included in the applicable operating budget for the Company without the
necessity of approval by the Members.

                                   ARTICLE VII
                                    MEETINGS

     7.01 MEETINGS OF MEMBERS AND COMMITTEES.

     (a) A quorum shall be present at a meeting of Members or any committee of
the Company if the holders of at least 37.5% of all of the Membership Interests
of the Company are represented at the meeting in person or by proxy. At a
meeting of the Members at which a quorum is present with respect to any matter
(except for any matter requiring the affirmative vote of (i) a Super-Majority
Interest or all of the Membership Interest as required by this Agreement or (ii)
a Required Interest greater than a Majority Interest as required by this
Agreement or the Act), the affirmative vote of the Majority Interest shall be
the act of the Members.


                                       36

<PAGE>   42


     (b) All meetings of the Members or any committee of the Company shall be
held at the principal place of business of the Company or at such other place
within or without the State of Delaware as shall be specified or fixed in the
notices or waivers of notice thereof; provided that any or all Members or their
representatives may participate in any such meeting by means of conference
telephone or similar communications equipment pursuant to Section 16.10.

     (c) Notwithstanding the other provisions of this Agreement, the holders of
at least a Majority Interest of the Company shall have the power to adjourn such
meeting from time to time, without any notice other than an announcement at the
meeting of the time and place of the resumption of the adjourned meeting. The
time and place of such adjournment shall be determined by a vote of the holders
of at least a Majority Interest of the Company. Upon the resumption of such
adjourned meeting, any business may be transacted that might have been
transacted at the meeting as originally called.

     (d) Unless otherwise expressly provided in a written notice issued by the
Members, an annual meeting of the Members for the transaction of such business
as may properly come before such meeting shall be held at the principal office
of the Company at 10:00 a.m. on the first Tuesday which is a Business Day in the
month of April. Regularly scheduled, periodic meetings of the Members or any
committee of the Company may be held without notice to the Members or Member
representatives at such times and places as shall from time to time be
determined by resolution of the Members or such Member representatives and
communicated to all Members or their representatives. Each Member, or its
representatives in the case of committee meetings, shall use reasonable efforts
to inform the other Members or committee representatives of any business matters
that it intends to raise at any regular meeting of the Members or any committee
of the Company within a reasonable time prior to such meeting, provided that the
business matters to be acted upon at any such a meeting shall not be limited to
the matters disclosed by a Member or its representative(s) prior to such
meeting.

     (e) Special meetings of the Members or any committee of the Company, for
any purpose or purposes, unless otherwise prescribed by law, shall be called by
(i) President or Secretary (if any) (ii) Member representative(s) at the request
in writing by the President, (iii) Members holding at least twenty percent (20%)
or more of the Membership Interests of the Company or (iv) at least two Members.
Such request of the President, Secretary or Member representative(s) shall state
the purpose or purposes of the proposed meeting.

     (f) Except as provided otherwise by the Agreement or applicable law,
written or printed notice stating the place, day and hour of the meeting and, in
the case of a special meeting, the purpose or purposes for which such meeting is
called, shall be delivered not less than ten nor more than 60 (including
Saturdays, Sundays and holidays) days before the date of the proposed meeting,
either personally, by certified mail (return receipt requested) or by telecopy
(with a copy delivered via United States mail), by or at the direction of the
Person calling the meeting, to each Member or Member representative, as the case
may be, entitled to vote thereat. If mailed, any such notice shall be deemed to
be delivered when deposited in the United States


                                       37

<PAGE>   43


mail, addressed to the Member, or Member representative, at its address provided
for in Section 16.19, with postage thereon prepaid.

     (g) The date on which notice of a meeting of the Members or any committee
of the Company is mailed shall be the Record Date for the determination of the
Members or Member representatives entitled to notice of or to vote at such
meeting, including any adjournment thereof, or the Members or Member
representatives entitled to receive such distribution.

     7.02 SPECIAL ACTIONS. The approval of the holders of a Super-Majority
Interest of the Members shall be required to authorize and approve the
following:

          (i)    acquiring and disposing of, and utilizing for Company purposes,
     any material asset of the Company;

          (ii)   borrowing money;

          (iii)  determining the reserve applicable to distributions of Company
     cash and other property as provided in Section 5.03;

          (iv)   authorizing transactions not in the ordinary course of
     business;

          (v)    permitting the Company to merge, consolidate, participate in a
     share exchange or other statutory reorganization with, or sell all or
     substantially all of the assets of the Company to, any Person;

          (vi)   permitting the Company to dissolve and liquidate;

          (vii)  approving any operating and capital expenditures budgets for
     the Company;

          (viii) entering into contracts, agreements and other undertakings
     binding the Company to pay more than $500,000 in any year or $1,000,000 in
     the aggregate pursuant to any such individual contract, agreement or
     undertaking that may be necessary, appropriate, or advisable in furtherance
     of the purposes of the Company;

          (ix)   authorizing the Company to enter into a transaction involving a
     Lateral Opportunity in accordance with Article XV; and

          (x)    entering into Oil Contracts with a term of one year or more.

     7.03 VOTING LIST. The officer of the Company who is responsible for the
maintenance of the Company's records shall make, at least ten days before each
meeting of Members or the Management Committee, a complete list of the Members
or their representatives, as the case may


                                       38

<PAGE>   44

be, entitled to vote thereat or any adjournment thereof, arranged in
alphabetical order, with the address of and the Membership Interest held or
represented by each, which list, for a period of ten days prior to such meeting,
shall be kept on file at the registered office or principal place of business
of the Company and shall be subject to inspection by any Member or Member
representative at any time during usual business hours. Such list shall also be
produced and kept open at the time and place of the meeting and shall be subject
to the inspection of any Member or Member representative during the whole time
of the meeting. The original Company records shall be prima facie evidence as to
who are the Members or their representatives entitled to examine such list or
transfer records or to vote at any meeting of Members or the Management
Committee. Failure to comply with the requirements of this Section 7.03 shall
not affect the validity of any action taken at the meeting.

     7.04 PROXIES. A Member or Member representative may vote either in person
or by proxy executed in writing by the Member or Member representative. A
telegram, telex, cablegram or similar transmission by the Member or Member
representative or a photographic, photostatic, facsimile or similar reproduction
of writing executed by the Member or Member representative shall be treated as
an execution in writing for purposes of this Section 7.04. Proxies for use at
any meeting of the Members or committee of the Company or in connection with the
taking of any action by written consent shall be filed with the Company before
or at the time of the meeting or execution of the written consent, as the case
may be. All proxies shall be received and taken charge of and all ballots shall
be received and canvassed by an inspector or inspectors appointed by the
President or a Vice President of the Company who shall decide all questions
touching upon the qualification of voters, the validity of the proxies, and the
acceptance or rejection of votes.

     7.05 VOTES. Each Member or Member representative shall be entitled to one
vote (or a fraction thereof) per percent (or fraction thereof) of Membership
Interest held by such Member, as reflected in the transfer records of the
Company.

     7.06 CONDUCT OF MEETINGS. All meetings of the Members or committees of the
Company shall be presided over by the chairman of the meeting, who shall be
designated by the Chief Executive Officer, President, Vice President or other
appropriate officer of the Company. The chairman of any meeting of Members or
committee of the Company shall determine the order of business and the procedure
at the meeting, including regulation of the manner of voting and the conduct of
discussion.

     7.07 ACTION BY WRITTEN CONSENT.

     (a) Except as otherwise provided by law, any action required or permitted
to be taken at any meeting of Members or committee of the Company may be taken
without a meeting, without prior notice, and without a vote, if a consent or
consents in writing, setting forth the action so taken, shall be signed by the
holder or holders or representatives of not less than the minimum of Membership
Interests that would be necessary to take such action at a meeting at which the
holders of all Membership Interests entitled to vote on the action were present
and


                                       39

<PAGE>   45

voted. To the extent required by law, every written consent shall bear the date
of signature of each Member or Member representative who signs the consent. To
the extent required by law, no written consent shall be effective to take the
action that is the subject to such consent unless, within 60 days after the date
of the earliest dated consent delivered to the Company in the manner required by
this Section 7.07, a consent or consents signed by the holder or holders of not
less than the minimum Membership Interests that would be necessary to take the
action that is the subject of the consent are delivered to the Company by
delivery to its registered office or its principal place of business. Delivery
shall be by hand or certified or registered mail (return receipt requested) to
the Company's principal place of business and shall be addressed to the
Secretary of the Company. A telegram, telex, cablegram or similar transmission
by a Member or Member representative, or a photographic, photostatic, facsimile
or similar reproduction of a writing signed by a Member or Member
representative, shall be regarded as signed by the Member or Member
representative for purposes of this Section 7.07. Prompt written notice of the
taking of any action by the Members or committees of the Company without a
meeting by less than unanimous written consent shall be given to those Members
or Member representatives who did not consent in writing to the action.

     (b) The Record Date for determining Members or their representatives
entitled to consent to an action in writing without a meeting shall be the first
date on which a signed written consent setting forth the action taken or
proposed to be taken is delivered to the Company. Delivery shall be by hand or
by certified or registered mail (return receipt requested) to the Company's
principal place of business and shall be addressed to the Secretary of the
Company.

     7.08 RECORDS. An officer of the Company or a designated Member
representative shall be responsible for maintaining the records of the Company,
including keeping minutes at the meetings of the Members or committees of the
Company and the filing of consents in the records of the Company.

                                  ARTICLE VIII.
                                 INDEMNIFICATION

     8.01 RIGHT TO INDEMNIFICATION. Subject to the limitations and conditions
as provided herein or by applicable law, each Person who was or is made a party
or is threatened to be made a party to or is involved in any threatened, pending
or completed action, suit or proceeding, whether civil, criminal,
administrative, arbitrative or investigative (hereinafter a "Proceeding"), or
any appeal in such a Proceeding or any inquiry or investigation that could lead
to such a Proceeding, by reason of the fact that he or she, or a Person of whom
he or she is the legal representative, is or was a Member of the Company, a
member of a committee of the Company or an officer of the Company, or while such
a Person is or was serving at the request of the Company as a director, officer,
partner, venturer, proprietor, trustee, employee, agent, or similar functionary
of another foreign or domestic general partnership, corporation, partnership,
joint venture, sole proprietorship, trust, employee benefit plan or other
enterprise, shall be indemnified by the Company to the extent such Proceeding or
other above-described process relates to any


                                       40

<PAGE>   46

such above-described relationships with, status with respect to, or
representation of any such Person to the fullest extent permitted by the Act, as
the same exists or may hereafter be amended (but, in the case of any such
amendment, only to the extent that such amendment permits the Company to provide
broader indemnification rights than said law permitted the Company to provide
prior to such amendment) against judgments, penalties (including excise and
similar taxes and punitive damages), fines, settlements and reasonable expenses
(including, without limitation, attorneys' fees) actually incurred by such
Person in connection with such Proceeding, and indemnification under this
Article VIII shall continue as to a Person who has ceased to serve in the
capacity which initially entitled such Person to indemnity hereunder for any and
all liabilities and damages related to and arising from such Person's activities
while acting in such capacity; provided, however, that no Person shall be
entitled to indemnification under this Section 8.01 in the event the Proceeding
involves acts or omissions of such Person which constitute an intentional breach
of this Agreement or gross negligence or willful misconduct on the part of such
Person. The rights granted pursuant to this Article VIII shall be deemed
contract rights, and no amendment, modification or repeal of this Article VIII
shall have the effect of limiting or denying any such rights with respect to
actions taken or Proceedings arising prior to any such amendment, modification
or repeal. It is expressly acknowledged that the indemnification provided in
this Article VIII could involve indemnification for negligence or under theories
of strict liability.

     8.02 INDEMNIFICATION OF OFFICERS, EMPLOYEES AND AGENTS. The Company may
indemnify, and advance expenses to, Persons who are not or were not a Member,
including officers, employees or agents of the Company, and those Persons who
are or were serving at the request of the Company as a manager, director,
officer, partner, venturer, proprietor, trustee, employee, agent or similar
functionary of another foreign or domestic general partnership, corporation,
partnership, joint venture, sole proprietorship, trust, employee benefit plan or
other enterprise against any liability asserted against him and incurred by him
in such a capacity or arising out of his status as such a Person to the same
extent that it may indemnify and advance expenses to a Member under this Article
VIII.

     8.03 ADVANCE PAYMENT. The right to indemnification conferred in this
Article VIII shall include a limited right to be paid or reimbursed by the
Company for any and all reasonable expenses as they are incurred by a Person
entitled to be indemnified under Sections 8.01 and 8.02 who was, or is
threatened, to be made a named defendant or respondent in a Proceeding in
advance of the final disposition of the Proceeding and without any determination
as to such Person's ultimate entitlement to indemnification; provided, however,
that the payment of such expenses incurred by any such Person in advance of
final disposition of a Proceeding shall be made only upon delivery to the
Company of a written affirmation by such Person of his good faith belief that he
has met the requirements necessary for indemnification under this Article VIII
and a written undertaking, by or on behalf of such Person, to repay all amounts
so advanced if it shall ultimately be determined that such indemnified Person is
not entitled to be indemnified under this Article VIII or otherwise.

     8.04 APPEARANCE AS A WITNESS. Notwithstanding any other provision of this
Article VIII, the Company may pay or reimburse expenses incurred by any Person
entitled to be


                                       41

<PAGE>   47

indemnified pursuant to this Article VIII in connection with such Person's
appearance as a witness or other participation in a Proceeding at a time when he
is not a named defendant or respondent in the Proceeding.

     8.05 NONEXCLUSIVITY OF RIGHTS. The right to indemnification and the
advancement and payment of expenses conferred in this Article VIII shall not
be exclusive of any other right which a Person indemnified pursuant to Sections
8.01 and 8.02 may have or hereafter acquire under any law (common or statutory),
this Agreement, or any other agreement, vote of Members or otherwise.

     8.06 INSURANCE. The Company may purchase and maintain indemnification
insurance, at its expense, to protect itself and any Person from any expenses,
liabilities, or losses that may be indemnified under this Article VIII.

     8.07 MEMBER NOTIFICATION. Any indemnification of or advance of expenses to
any Person entitled to be indemnified under this Article VIII shall be reported
in writing to the Members with or before the notice or waiver of notice of the
next Members' meeting or with or before the next submission to Members of a
consent to action without a meeting and, in any case, within the 12-month period
immediately following the date the indemnification or advance was made.

     8.08 SAVINGS CLAUSE. If this Article VIII or any portion hereof shall be
invalidated on any ground by any court of competent jurisdiction, then the
Company shall nevertheless indemnify and hold harmless any Person entitled to be
indemnified pursuant to this Article VIII as to costs, charges and expenses
(including attorneys' fees), judgments, fines and amounts paid in settlement
with respect to any action, suit or proceeding, whether civil, criminal,
administrative or investigative to the full extent permitted by any applicable
portion of this Article VIII that shall not have been invalidated and to the
fullest extent permitted by applicable law.

     8.09 SCOPE OF INDEMNITY. For the purposes of this Article VIII, references
to the "Company" include all constituent entities, whether corporations or
otherwise, absorbed in a consolidation or merger as well as the resulting or
surviving entity. Thus, any Person entitled to be indemnified or receive
advances under this Article VIII shall stand in the same position under the
provisions of this Article VIII with respect to the resulting or surviving
entity as he would have if such merger, consolidation, or other reorganization
never occurred.

                                   ARTICLE IX.
                                      TAXES

     9.01. TAX RETURNS. The Company shall cause to be prepared and filed all
necessary federal and state income tax returns for the Company, including making
the elections described in Section 9.02. Upon written request by the Company,
each Member shall furnish to the


                                       42

<PAGE>   48

Company all pertinent information in its possession relating to Company
operations that is necessary to enable the Company's income tax returns to be
prepared and filed.

     9.02 TAX ELECTIONS. The Company shall make the following elections on the
appropriate tax returns:

     (a) to adopt the accrual method of accounting;

     (b) an election pursuant to section 754 of the Code;

     (c) to elect to amortize the organizational expenses of the Company and the
start-up expenditures of the Company under section 195 of the Code ratably over
a period of 60 months as permitted by section 709(b) of the Code; and

     (d) any other election that the Company may deem appropriate and in the
best interests of the Company or Members, as the case may be.

Neither the Company nor any Member may make an election for the Company to be
excluded from the application of the provisions of subchapter K of chapter 1 of
subtitle A of the Code or any similar provisions of applicable state law, and no
provision of this Agreement shall be construed to sanction or approve such an
election.

     9.03 TAX MATTERS MEMBER. The Company shall select one of the Members as
the "Tax Matters Member" of the Company pursuant to section 6231(a)(7) of the
Code. The Tax Matters Member shall take such action as may be necessary to cause
each Member to become a "notice partner" within the meaning of section 6223 of
the Code and shall inform each Member of all significant matters that may come
to its attention in its capacity as Tax Matters Member by giving notice thereof
on or before the fifth Business Day after becoming aware thereof and, within
that time, shall forward to each other Member copies of all significant written
communications it may receive in that capacity. The Tax Matters Member may not
take any action contemplated by sections 6222 through 6232 of the Code without
the consent of a Majority Interest, but this sentence does not authorize the Tax
Matters Member to take any action left to the determination of an individual
Member under sections 6222 through 6232 of the Code. The initial Tax Matters
Member shall be the Member so indicated on Exhibit A.

                                   ARTICLE X.
                   BOOKS, RECORDS, REPORTS, AND BANK ACCOUNTS

     10.01 MAINTENANCE OF BOOKS. The Company shall keep books and records of
accounts and shall keep minutes of the proceedings of its Members. The books of
account for the Company shall be maintained on an accrual basis in accordance
with the terms of this Agreement and generally accepted accounting principles,
except that the Capital Accounts of the Members



                                       43

<PAGE>   49

shall be maintained in accordance with Section 4.06. The accounting year of the
Company shall be determined by the Company.

     10.02 FINANCIAL STATEMENTS. On or before the last day of each calendar
month during the term of the Company, the Company shall cause each Member to be
furnished with a balance sheet, an income statement and a statement of cash
flows for, or as of the end of, the calendar month immediately preceding such
calendar month. On or before the last day of each April during the existence of
the Company, the Company shall cause each Member to be furnished with audited
financial statements, including, a balance sheet, an income statement, a
statement of cash flows, and a statement of changes in each Member's Capital
Account for, or as of the end of, the immediately preceding calendar year.
Annual financial statements must be prepared in accordance with generally
accepted accounting principles consistently applied (except as therein noted).
The Company also may cause to be prepared or delivered such other reports as it
may deem, in its sole judgment, appropriate. The Company shall bear the costs
of all such reports and financial statements.

     10.03 TAX STATEMENTS. On or before the last day of June during the
existence of the Company, the Company shall cause each Member to be furnished
with all information reasonably necessary or appropriate to file their
appropriate tax reports, including a schedule of Company book-tax differences
for, or as of the end of, the immediately preceding tax year.

     10.04 ACCOUNTS. The officers of the Company shall establish and maintain
one or more separate bank and investment accounts and arrangements for Company
funds in the Company's name with financial institutions and firms that officers
of the Company may determine. The Company may not commingle the Company's funds
with the funds of any other Person. All such accounts shall be and remain the
property of the Company and all funds shall be received, held and disbursed for
the purposes specified in this Agreement. The officers of the Company may invest
the Company funds only in (i) readily marketable securities issued by the United
States or any agency or instrumentality thereof and backed by the full faith and
credit of the United States maturing within three months or less from the date
of acquisition, (ii) readily marketable securities issued by any state or
municipality within the United States of America or any political subdivision,
agency or instrumentality thereof, maturing within three months or less from the
date of acquisition and rated "A" or better by any recognized rating agency,
(iii) readily marketable commercial paper rated "Prime-1" by Moody's or "A-1" by
Standard and Poor's (or comparably rated by such organizations or any successors
thereto if the rating system is changed or there are such successors) and
maturing in not more than three months after the date of acquisition or (iv)
certificates of deposit or time deposits issued by any incorporated bank
organized and doing business under the Laws of the United States of America
which is rated at least "A" or "A2" by Standard and Poors or Moody's, which is
not in excess of federally insured amounts, and which matures within three
months or less from the date of acquisition.


                                       44

<PAGE>   50

                                   ARTICLE XI.
                            BANKRUPTCY OF A MEMBER

     11.01 BANKRUPT MEMBERS. Subject to Section 12.01(c), if any Member becomes
a Bankrupt Member, the Company or, if the Company does not exercise the relevant
option, the remaining Members which desire to participate, shall have the
option, exercisable by notice from the Company or the Members, as the case may
be, to the Bankrupt Member (or its representative) at any time prior to the
180th day after receipt of notice of the occurrence of the event causing it to
become a Bankrupt Member, to buy, and, on the exercise of this option, the
Bankrupt Member or its representative shall sell, its Membership Interest. The
purchase price shall be an amount equal to the fair market value thereof
determined by agreement by the Bankrupt Member (or its representative) and the
purchasing Person; however, if those Persons do not agree on the fair market
value on or before the 30th day following the exercise of the option, either
such Person, by written notice to the other, may require the determination of
fair market value to be made by an independent appraiser specified in such
notice. If the Person receiving that notice objects on or before the tenth day
following receipt to the independent appraiser designated in that notice, and
those Persons otherwise fail to agree on an independent appraiser, either such
Person may petition the United States District Judge for the Southern District
of Texas then senior in active service to designate an independent appraiser,
whose determination of the independent appraiser, however designated, is final
and binding on all parties. The Bankrupt Member and the purchasing Person each
shall pay one-half of the costs of the appraisal and court costs in appointing
an appraiser (if any). The purchasing Person shall pay the fair market value as
so determined in cash on closing. The payment to be made to the Bankrupt Member
or its representative pursuant to this Section 11.01 is in complete liquidation
and satisfaction of all the rights and interest of the Bankrupt Member and its
representative (and of all Persons claiming by, through, or under the Bankrupt
Member and its representative) in and in respect of the Company, including,
without limitation, any Membership Interest, any rights in specific Company
property, and any rights against the Company and its officers, agents, and
representatives and (insofar as the affairs of the Company are concerned)
against the Members.

                                  ARTICLE XII.
                    DISSOLUTION, LIQUIDATION, AND TERMINATION

     12.01 DISSOLUTION. Subject to the provisions of Section 12.02, the Company
shall dissolve and its affairs shall be wound up on the first to occur of the
following:

     (a) the consent of holders of at least a Super-Majority Interest of the
Membership Interests pursuant to Section 7.02(vi);

     (b) the expiration of the period fixed for the duration of the Company as
set forth in this Agreement;


                                       45

<PAGE>   51

     (c) entry of a decree of judicial dissolution of the Company under section
18-802 of the Act; and

     (d) the bankruptcy or dissolution of a Member or other event described in
section 18-801 of the Act (other than a Transfer of Membership Interest in
accordance with the terms of this Agreement).

     12.02 LIQUIDATION AND TERMINATION. Subject to Section 12.02(d), upon
dissolution of the Company, a representative of the Company selected by a
Majority Interest (not including any member in Default at the time of
dissolution) shall act as a liquidator or may appoint one or more Members as
liquidator ("Liquidator"). The Liquidator shall proceed diligently to wind up
the affairs of the Company and make final distributions as provided herein and
in the Act. The costs of liquidation shall be borne as a Company expense. Until
final distribution, the Liquidator shall continue to operate the Company
properties for a reasonable period of time to allow for the sale of all or a
part of the assets thereof with all of the power and authority of the Members.
The steps to be accomplished by the Liquidator are as follows:

     (a) as promptly as possible after dissolution and again after final
liquidation, the Liquidator shall cause a proper accounting to be made of the
Company's assets, liabilities, and operations through the last day of the
calendar month in which the dissolution occurs or the final liquidation is
completed, as applicable;

     (b) the Liquidator shall cause any notices required by law to be mailed to
each known creditor of and claimant against the Company in the manner described
by such law;

     (c) subject to the terms and conditions of this Agreement and the Act
(especially section 18-803), the Liquidator shall distribute the assets of the
Company in the following order:

          (i) the Liquidator shall pay, satisfy or discharge from Company funds
     all of the debts, liabilities and obligations of the Company, including
     without limitation all expenses incurred in liquidation (but excluding any
     advances or Capital Contributions described in Section 4.05) or otherwise
     make adequate provision for payment and discharge thereof (including,
     without limitation, the establishment of a cash escrow fund for contingent
     liabilities in such amount and for such term as the Liquidator may
     reasonably determine);

          (ii) the Liquidator shall pay, satisfy or discharge from Company funds
     all of the advances and loans (but not Capital Contributions) made to the
     Company by Members, as described in Section 4.05; and

          (iii) all remaining assets of the Company shall be distributed to the
     Members as follows:



                                       46

<PAGE>   52

               (A) the Liquidator may sell any or all Company property,
          including to one or more of the Members (other than any Member in
          Default at the time of dissolution), and any resulting gain or loss
          from each sale shall be computed and allocated to the Capital Accounts
          of the Members on a pro rata basis in accordance with each of their
          respective Membership Interests;

               (B) with respect to all Company property that has not been sold,
          the fair market value of that property (as determined by the
          Liquidator using any method of valuation as it, using its best
          judgment, deems reasonable) shall be determined and the Capital
          Accounts of the Members shall be adjusted to reflect the manner in
          which the unrealized income, gain, loss, and deduction inherent in
          property that has not been reflected in the Capital Accounts
          previously would be allocated among the Members if there were a
          taxable disposition of that property for the fair market value of that
          property on the date of distribution; and

               (C) Company property shall be distributed among the Members
          ratably in proportion to each Member's Capital Account balances, as
          determined after taking into account all Capital Account adjustments
          for the taxable year of the Company during which the liquidation of
          the Company occurs (other than those made by reason of this clause
          (C); and in each case, those distributions shall be made by the end of
          the taxable year of the Company during which the liquidation of the
          Company occurs (or, if later, 90 days after the date of the
          liquidation).

All distributions in kind to the Members shall be made subject to the liability
of each distributee for costs, expenses, and liabilities theretofore incurred or
for which the Company has committed prior to the date of termination and those
costs, expenses, and liabilities shall be allocated to the distributee pursuant
to this Section 12.02. The distribution of cash and/or property to a Member in
accordance with the provisions of this Section 12.02 constitutes a complete
return to the Member of its Capital Contributions and a complete distribution to
the Member of its Membership Interest and all the Company's property. To the
extent that a Member returns funds to the Company, it has no claim against any
other Member for those funds.

     (d) Upon dissolution of the Company upon an event occurring to a Member
described in Section 12.01(d) (the "Withdrawing Member"), then within thirty
(30) days after the Company delivers notice of such event to the Members, at
least 50% of such other Members (by Membership Interest and excluding the
Membership Interest of the transferring or bankrupt Member) may elect to
reconstitute the Company and continue its business on the same terms and
conditions set forth in this Agreement by forming a new company on terms
identical to those set forth in this Agreement and, as necessary, admitting an
additional Member chosen by such other Members. Such other Members shall be
deemed to have voted for and consented to such reconstitution unless a written
statement objecting to the reconstitution shall have been received by the
Company within thirty (30) days after notice of dissolution was made to such
Member.


                                       47


<PAGE>   53

Upon any such election to reconstitute by at least 50% of such other Members (by
Membership Interest), all Members, Withdrawing Members, and successors shall be
bound thereby and shall be deemed to have approved thereof. Unless such an
election to reconstitute is made within the applicable time period as set forth
above, the Company shall conduct only activities necessary to wind up its
affairs. If such an election is so made, then:

          (i) the reconstituted Company shall continue until the end of the term
     set forth in Section 2.06 unless earlier dissolved in accordance with this
     Article XII;

          (ii) the interest of the Withdrawing Member shall be treated
     thenceforth as the interest of a Transferee that has not been admitted as a
     Substitute Member hereunder; and

          (iii) all necessary steps shall be taken to cancel this Agreement and
     to enter into and, as necessary, to file new organizational documents;
     provided that the right to reconstitute and to continue the business of the
     Company shall not exist and may not be exercised unless the Company has
     received an opinion of counsel that the Company would not become taxable as
     a corporation or otherwise be taxed as an entity for federal income tax
     purposes upon the exercise of such right to continue.

     12.03 PROVISION FOR CONTINGENT CLAIMS.

     (a) The Liquidator shall make a reasonable provision to pay all claims and
obligations, including all contingent, conditional or unmatured claims and
obligations, actually known to the Company but for which the identity of the
claimant is unknown; and

     (b) If there are insufficient assets to both pay the creditors pursuant to
Section 12.02(c)(i) and to establish the provision contemplated by Section
12.03(a), the claims shall be paid as provided for in accordance to their
priority, and, among claims of equal priority, ratably to the extent of assets
therefor.

     12.04 DEFICIT CAPITAL ACCOUNTS. Notwithstanding anything to the contrary
contained in this Agreement, and notwithstanding any custom or rule of law to
the contrary, to the extent that the deficit, if any, in the Capital Account of
any Member results from or is attributable to deductions and losses of the
Company (including non-cash items such as depreciation), or distributions of
money pursuant to this Agreement to all Members ratably in proportion to their
respective Membership Interest, upon dissolution of the Company such deficit
shall not be an asset of the Company and such Members shall not be obligated to
contribute any amounts to the Company to bring the balance of such Member's
capital account to zero.


                                       48
<PAGE>   54

                                  ARTICLE XIII.
                           AMENDMENT OF THE AGREEMENT

          13.01 AMENDMENTS TO BE ADOPTED BY THE COMPANY. Each Member agrees that
the appropriate officer of the Company, in accordance with and subject to the
limitations contained in Article VII, may amend the Company's certificate of
formation, and execute, swear to, acknowledge, deliver, file and record whatever
documents may be required to reflect:

         (a) a change in the name of the Company, the location of the principal
place of business of the Company or the registered agent or office of the
Company;

         (b) admission or substitution of Members effected in accordance with
this Agreement;

         (c) a change that the appropriate officer of the Company believes is
reasonable and necessary or appropriate to qualify or continue the qualification
of the Company as a limited liability company under the Laws of any state or
that is necessary or advisable in the opinion of the Company to ensure that the
Company will not be taxable as a corporation or otherwise taxed as an entity for
federal income tax purposes;

          (d) a change (i) that the appropriate officer of the Company believes
does not adversely affect the Members in any material respect, or (ii) that is
necessary or appropriate for the Company to satisfy any requirements,
conditions, guidelines or interpretations contained in any opinion,
interpretative release, directive, order, ruling or regulation of any federal or
state agency or judicial authority (including, without limitation, the Act);

         (e) an amendment that is necessary, in the opinion of counsel, to
prevent the Company or its officers from in any manner being subjected to the
provisions of the Investment Company Act of 1940, as amended, or "plan asset"
regulations adopted under the Employee Retirement Income Security Act of 1974,
as amended, whether or not substantially similar to plan asset regulations
currently applied or proposed by the United States Department of Labor;

         (f) subject to the terms of Section 3.09, an amendment that the Company
determines in its sole discretion to be necessary or appropriate in connection
with the authorization for issuance of any Membership Interest pursuant to
Section 3.09; and

         (g) any amendment expressly permitted in this Agreement to be made by
the Company.

         13.02 AMENDMENT PROCEDURES. Except as provided in Section 13.01, all
amendments to this Agreement shall be made in accordance with the following
requirements. Amendments to this Agreement may be proposed by any Member. Each
such proposal shall contain the text of the proposed amendment. If an amendment
is proposed, the Company shall seek the written approval of the holders of the
requisite percentage of Membership Interests or call a meeting of

                                       49

<PAGE>   55




the Members to consider and vote on such proposed amendment. A proposed
amendment shall be effective upon its approval by the holders of all of the
Membership Interests, unless a different percentage is required under this
Agreement. Any amendment that would materially and adversely affect the rights
of any type or class of Membership Interests in relation to other types or
classes of Membership Interests requires the approval of the holders of at least
a majority of the Membership Interests of such class or type of Membership
Interest. The Company shall notify all Record Holders upon final adoption of
any proposed amendment.

                                  ARTICLE XIV.
                        CERTIFICATED MEMBERSHIP INTERESTS

         14.01 ENTITLEMENT TO CERTIFICATES. Every owner of a Membership Interest
in the Company, unless and to the extent the Company elects otherwise, shall be
entitled to have a certificate, in such form as is approved by the Company and
conforms with applicable law, certifying the Membership Interest owned by it.

         14.02 MULTIPLE CLASSES OF INTEREST. If the Company shall be authorized
to issue more than one class of Membership Interest or more than one series of
any Membership Interest, a statement of the powers, designations, preferences
and relative, participating, optional or other special rights of each class of
membership interest or series thereof and the qualification, limitations or
restrictions of such preferences and/or rights shall, unless the Members shall
by resolution provide that such class or series of Membership Interest shall be
uncertificated, be set forth in full or summarized on the face or back of the
certificate which the Company shall issue to represent such class or series of
Membership Interest; provided that, to the extent allowed by law, in lieu of
such statement, the face or back of such certificate may state that the Company
will furnish a copy of such statement without charge to each requesting Member.

         14.03 SIGNATURES. Each certificate representing a Membership Interest
in the Company shall be signed by or in the name of the Company by (1) any of
the President or Vice President of the Company; and (2) any of the Treasurer, an
Assistant Treasurer, the Secretary or an Assistant Secretary of the Company. The
signature of the officers of the Company may be facsimiles. In case any officer
who has signed or whose facsimile signature has been placed upon a certificate
shall have ceased to hold such office before such certificate is issued, it may
be issued by the Company with the same effect as if he held such office on this
date of issue.

         14.04 ISSUANCE AND PAYMENT. Subject to the provisions of the Act and
this Agreement, Membership Interests may be issued for such consideration and to
such persons as the Company may determine from time to time. Membership
Interests may not be issued until the full amount of the consideration has been
paid, unless upon the face or back of each certificate issued to represent any
partly paid Membership Interest there shall have been set forth the total amount
of the consideration to be paid therefor and the amount paid thereon up to and
including the time said certificate is issued.

                                       50

<PAGE>   56




         14.05 RESTRICTIVE LEGEND. In the absence of a more restrictive legend,
all certificates which evidence Membership Interests shall be stamped or typed
in a conspicuous place with the following legend:

         THE INTEREST REPRESENTED BY THIS CERTIFICATE IS SUBJECT TO THE LIMITED
         LIABILITY AGREEMENT OF THE COMPANY DATED AS OF FEBRUARY 14,1996, WHICH
         RESTRICTS ANY SALE, ASSIGNMENT, TRANSFER, CONVEYANCE, ENCUMBRANCE,
         PLEDGE OR OTHER TRANSFER OR ALIENATION (WITH OR WITHOUT CONSIDERATION)
         OF SUCH INTEREST. THE COMPANY WILL FURNISH TO THE RECORD HOLDER OF THIS
         CERTIFICATE, WITHOUT CHARGE, UPON WRITTEN REQUEST TO THE COMPANY AT ITS
         PRINCIPAL PLACE OF BUSINESS, A COPY OF SUCH LIMITED LIABILITY
         AGREEMENT. THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE BEEN
         ACQUIRED FOR INVESTMENT AND HAVE NOT BEEN REGISTERED UNDER THE
         SECURITIES ACT OF 1933, AS AMENDED, OR THE SECURITIES LAWS OF ANY
         STATE. WITHOUT SUCH REGISTRATION, SUCH SECURITIES MAY NOT BE SOLD,
         ASSIGNED, TRANSFERRED, CONVEYED, PLEDGED, HYPOTHECATED, OR OTHERWISE
         TRANSFERRED, EXCEPT UPON DELIVERY TO THE COMPANY OF AN OPINION OF
         COUNSEL SATISFACTORY TO THE COMPANY THAT SUCH REGISTRATION IS NOT
         REQUIRED FOR SUCH TRANSFER.

Such legend shall also be placed on all Certificates which are hereafter issued
to any Member.

         14.06 LOST, STOLEN OR DESTROYED CERTIFICATES. The Company may direct a
new certificate or certificates to be issued in place of any certificate or
certificates theretofore issued by the Company alleged to have been lost, stolen
or destroyed upon the making of an affidavit of that fact by the Person claiming
the certificate of stock to be lost, stolen or destroyed. When authorizing such
issue of a new certificate or certificates, the Company may, in its discretion
and as a condition precedent to the issuance thereof, require the owner of such
lost, stolen or destroyed certificate or certificates, or his legal
representative, to advertise the same in such manner as it shall require and/or
to give the Company a bond in such sum as it may direct as indemnity against any
claim that may be made against the Company with respect to the certificate
alleged to have been lost, stolen or destroyed.

         14.07 TRANSFER OF MEMBERSHIP INTEREST. Upon surrender to the Company or
its transfer agent, if any, of a certificate representing Membership Interests
duly endorsed or accompanied by proper evidence of succession, assignation or
authority to transfer in accordance with this Agreement and of the payment of
all taxes applicable to the transfer of said Membership Interest, the Company
shall be obligated to issue a new certificate to the Person entitled thereto,
cancel the old certificate and record the transaction upon its books, provided,
however, that the Company shall not be so obligated unless such transfer was
made in compliance with the provisions of this Agreement and any applicable
state and federal securities Laws.

                                       51


<PAGE>   57

         14.08 REGISTERED HOLDERS. The Company shall be entitled to recognize
the exclusive right of a Person registered on its books as the owner of the
indicated Membership Interest and shall not be bound to recognize any equitable
or other claim to or interest in such Membership Interest on the part of any
Person other than such registered owner, whether or not it shall have express or
other notice thereof, except as otherwise provided by Law.

                                   ARTICLE XV.
                     OTHER MEMBER AGREEMENTS AND OBLIGATIONS

         15.01 PARTICIPATION IN EXTENSIONS AND EXPANSIONS. (a) Except as
otherwise provided in Section 15.01(b), each Member agrees that neither it nor
its Affiliates will, directly or indirectly, enter into any agreement to
construct or otherwise consummate transactions involving construction of any
pipeline laterals or extensions or related facilities (a "Lateral Opportunity")
to connect any oil or liquid condensate to the Poseidon Pipeline until
such Lateral Opportunity has been rejected or otherwise forfeited by the Company
and the Members, as applicable, pursuant to this Article; provided, however,
that this Article shall not apply to any exploration and production Affiliate
that intends to construct a pipeline lateral for the purpose of transporting
crude oil produced in whole or in part by such Affiliate. Any Member may propose
that the Company undertake a Lateral Opportunity by delivering written notice (a
"Lateral Opportunity Notice") to the Company and each of the other Members,
which Lateral Opportunity Notice would include the proposed terms and conditions
of such transactions and reasonably sufficient operational and financial
information and other details to allow such Members to make a reasonably
informed decision with respect to such Lateral Opportunity. If Members holding
at least a Super-Majority Interest do not agree and deliver notice thereof in
writing within thirty (30) days after the Company receives the Lateral
Opportunity Notice that the Company should undertake such project on the terms
and conditions set forth in the applicable Lateral Opportunity Notice, any
Member (including its Affiliates) voting in favor of such project shall have the
right to pursue such project (a "Rejected Lateral Opportunity") on the terms and
conditions set forth in the applicable Lateral Opportunity Notice and own any
assets related thereto in the proportion that such Member's Membership Interest
is to the Membership Interest of all Members electing to participate in the
Rejected Lateral Opportunity by giving written notice of such intent to the
Company within fifty (50) days after the Company receives the relevant Lateral
Opportunity Notice. In such event, the Members (or their Affiliates) desiring
to pursue such Rejected Lateral Opportunity shall be free for a period of sixty
(60) days after such fifty (50) day period to enter into definitive agreements,
if any, or otherwise consummate the transactions contemplated by the applicable
Lateral Opportunity Notice on the same terms and conditions set forth in the
applicable Lateral Opportunity Notice without further obligation to any Members
or the Company; provided that following such sixty (60) day period such Members
or their Affiliates may not enter into definitive agreements, if any, or
otherwise consummate the transactions with respect to a Rejected Lateral
Opportunity without again offering the same to the Company in accordance with
this Article. No Members shall have any obligation or duty to the Company or
the other Members with respect to any Rejected Lateral Opportunity to the
extent it is covered by definitive agreements entered into, or otherwise
consummated, by such Members or their Affiliates after

                                       52

<PAGE>   58




compliance with this Section 15.01 or with respect to any modification,
renewal or extension of the terms of such definitive agreements with respect to
any such Rejected Lateral Opportunity. The construction, operation, maintenance
and ownership of each such Rejected Lateral Opportunity project shall not be
governed or affected by this Agreement, but shall be governed by the contractual
and other arrangements established by the Members participating in such project.

         (b) Notwithstanding anything contained in this Agreement to the
contrary, Poseidon and any of its Affiliates shall have the right, at its sole
cost, expense and risk, to construct pipeline laterals or extensions or related
facilities to connect the Poseidon Pipeline to oil or liquid condensate produced
from Blocks 254, 297, 298 and 342 in the Green Canyon area, and Blocks 871, 914,
915, 916, 958, 959, 1002 and 1003 in the Ewing Bank Area Gulf of Mexico. Such
right shall be absolute and unconditional and shall be free and clear of any
obligation to offer the Company or any Member the right to participate therein.

         (c) Notwithstanding anything contained in this Agreement to the
contrary, Texaco and any of its Affiliates shall have the right, at its sole
cost, expense and risk, to construct pipeline laterals or extensions or related
facilities to connect the Poseidon Pipeline to oil or liquid condensate produced
from Blocks 331, 375, 419, 415, 416, 459, 460, 504, 505, 506, 507, 548, 549,
550, 551, 593, 594, 508, 509, 510, 552, 553 and 554 in the Green Canyon area,
Gulf of Mexico. Such right shall be absolute and unconditional and shall be free
and clear of any obligation to offer the Company or any Member the right to
participate therein.

         15.02 PROJECT FINANCINGS. Each Member shall be responsible for
arranging the financing of its share of Capital Contributions and advances or
loans to or other investments in the Company; provided, however, that the
Members agree to use commercially reasonable, good faith efforts to review and
pursue any project financing arrangement for the Company to the extent the terms
and conditions of such project financing are in the best interest of each of
the Members.

                                  ARTICLE XVI.
                               GENERAL PROVISIONS

         16.01 OFFSET. Whenever the Company is to pay any sum to any Member, any
amounts that a Member owes the Company may be deducted from that sum before
payment.

         16.02 ENTIRE AGREEMENT; SUPERSEDURE. This Agreement constitutes the
entire agreement and supersedes all prior (oral or written) or oral
contemporaneously proposals or agreements, all previous negotiations and all
other communications or understandings between the Parties with respect to the
subject matter hereof.

         16.03 WAIVERS. Neither action taken (including, without limitation, any
investigation by or on behalf of any Party) nor inaction pursuant to this
Agreement, shall be deemed to

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<PAGE>   59

constitute a waiver of compliance with any representation, warranty, covenant or
agreement contained herein by the Party not committing such action or inaction.
A waiver by any Party of a particular right, including, without limitation,
breach of any provision of this Agreement, shall not operate or be construed as
a subsequent waiver of that same right or a waiver of any other right.

         16.04 BINDING EFFECT. This Agreement shall be binding upon and inure to
the benefit of the Members and their respective heirs, legal representatives,
successors and assigns.

         16.05 MEMBER AND COMMITTEE DEADLOCKS; NEGOTIATIONS, MEDIATION AND
ARBITRATION.

               (a) Member and Committee Deadlocks. If any matter or proposal
(other than those matters specified in Section 6.03(b)(i), (ii), (iv), (v), (vi)
or (viii)) requiring the vote of less than all of the Membership Interest for
approval thereof is brought before the Members or the Management Committee and
(i) does not receive at least the Required Interest voting for such matter or
proposal or (ii) does not receive at least the Required Interest voting against
(not including abstentions or other non-votes) such matter or proposal, then any
Member by written notice to the other Members given within ten (10) days after
the initial vote on such matter or proposal, may call a meeting of the Members
or the Management Committee to reconsider such matter or proposal, such meeting
to be held when, where and as reasonably specified in said notice, but not less
than ten (10) days nor more than twenty-five (25) days after the date of such
vote. If such meeting is called and held as herein provided and the matter or
proposal at such meeting again and (i) does not receive at least the Required
Interest voting for such matter or proposal or (ii) does not receive at least
the Required Interest voting against (not including abstentions or other
non-votes) such matter or proposal, then any Member may within ten (10) days
thereafter submit the matter to arbitration in accordance with Section 16.05(b)
- - h. If no Member calls such a meeting within the first ten (10) day period
herein provided for or if arbitration is not requested within the ten (10) day
period after the second meeting, no Member shall thereafter have any right to
request arbitration regarding such matter or proposal. Member approval or
disapproval of the matters specified in Section 6.03(b)(i), (ii), (iv), (v),
(vi) or (viii) shall not be subject to arbitration under this Agreement.

               (b) Initiation of Proceedings. Any Member wishing to submit a
matter or proposal to arbitration as permitted by Section 16-05(a) shall do so
by giving written notice of arbitration to the other Members and the Company.
The Member initiating arbitration shall also simultaneously file duplicate
copies of its notice of arbitration with any regional office of the American
Arbitration Association ("AAA"), together with the appropriate fee as provided
in the AAA's administrative fee schedule. The initiating Member shall state in
its notice of arbitration the regional office of AAA it has selected and
thereafter all communications with the AAA regarding the arbitration
proceedings shall be directed to such office unless the AAA directs otherwise.
The notice of arbitration shall contain a brief description of the nature of the
dispute to be arbitrated and the remedy or resolution sought by the Member
initiating arbitration. Such notice may also contain a request that the dispute
be arbitrated by a panel of three arbitrators.

                                       54



<PAGE>   60




If no such request is contained in the notice, it shall be presumed that the
Member seeking arbitration desires the dispute to be determined by a single
arbitrator.

               (c) Responses. Each of the other Members shall, within twenty
(20) days from the date of mailing of the notice of arbitration, file with each
of the other Members, the Company and the AAA a response in which it states
its view regarding the dispute to be arbitrated and the remedy or resolution it
desires. Such response may also include a request that the dispute be determined
by a panel of three arbitrators. If any of the Members indicate, in accordance
with Section 16.05(b) or this Section 16.05(c), their desire to have the dispute
determined by a panel of three arbitrators, it shall be so determined.
Otherwise, the dispute shall be determined by a single arbitrator.

               (d) Selection of Arbitrators. As soon as practicable after the
expiration of the twenty (20) day period beginning upon the date of mailing of
the initiating Member's notice of arbitration, the AAA shall compile a list of
available arbitrators competent and qualified to determine the dispute as
described in the notice of arbitration and the responses thereto. If the Members
have elected, in accordance with Section 16.05(c), to have the dispute
determined by a panel of three arbitrators, the list shall be composed of eight
names and if the Members have elected to have the dispute determined by a
single arbitrator, the list shall be composed of six names. The AAA shall also,
at the same time, by lot, rank the Members in order, and shall thereupon
forthwith transmit the list simultaneously to the Members and inform them of the
order in which it has ranked them. Unless the Members shall beforehand agree to
a different time or place, or both, they shall meet at the principal office of
the Company at 10:00 a.m. local time on the Business Day after the date of
mailing the AAA's list of arbitrators and notice of ranking. At such time, they
shall each, one by one, in accordance with the ranking determined by the AAA,
strike a name from the list submitted by the AAA. The three or the one
remaining, as the case may be, when such process of striking has been completed,
shall be the arbitrators or arbitrator to arbitrate and determine the dispute.
If any of the arbitrators so selected declines or for any reason fails to serve,
the AAA shall forthwith furnish the Members a second list of additional
available arbitrators competent and qualified to determine the dispute, such
list to contain five names plus the names of as many individuals as there are
vacancies to fill because of the failure to serve of previously selected
arbitrators. The Members shall thereupon again, in accordance with the ranking
determined by the AAA, one by one, in turn, strike names from the list. The
individuals or individual whose names or name remain on the list upon the
completion of such striking shall, together with any arbitrators previously
chosen in the case of a dispute to be determined by a panel of three
arbitrators, be the arbitrators to arbitrate and determine the dispute. This
procedure shall be repeated until one or three arbitrators, as the case may be,
who are willing and able to serve have been selected. If any of the Members at
any point fails to participate in the procedure hereinabove established to
select arbitrators, the AAA shall forthwith eliminate one name from the list of
arbitrators for each Member not so participating.

                                       55

<PAGE>   61




               (e) Location. Unless otherwise agreed by the Members, the
arbitration proceedings shall be held in Houston, Texas at such location
selected by the arbitrator or panel of arbitrators.

               (f) Rules. Except as set forth in this Section 16.05, all
arbitration proceedings under this Section 16.05 shall be conducted in
accordance with the Commercial Arbitration Rules of the AAA, as then amended and
in effect; and such rules shall be interpreted and applied and questions
regarding the arbitration process not resolved under such rules shall be
determined in accordance with the Uniform Arbitration Act, as enacted in the
State of Delaware; provided, however, that the arbitrator or panel of
arbitrators shall resolve such dispute within sixty (60) days from the day a
member submitted its notice or arbitration to the other Members, the Company and
the AAA. In any such arbitration proceeding, the arbitrator shall determine
whether there is a reasonable basis for the withholding of agreement or approval
by one or more Members or committee members from the standpoint of the best
interests of the Company, in light of the purposes of the Company expressed
herein. A reasonable basis for withholding agreement or approval shall be found
if a reasonable business person would withhold agreement or approval under the
circumstances based soley upon what such reasonable business person believes is
in the best interest of the Company. In the event the arbitration proceeding
results in a decision that a Member's or committee member's agreement is being
or has been withheld without a reasonable basis, such Member's or committee
member's agreement will be deemed to have been given. During pendency of any
arbitration proceeding, the business of the Company shall continue to be
conducted in accordance with the most recently approved budgets until such time
as the arbitration is completed, agreement among the Members or any committee is
achieved, or the Company is dissolved in accordance with the provisions hereof.

               (g) Limitation on Arbitration. Except with respect to the matters
specified in Section 16.05(a) or 4.03(c), no Member shall have the right to
demand arbitration with respect to any dispute, difference or question arising
between any of the Members themselves or any Member and the Company as to the
meaning or interpretation of any provision of this Agreement or as to the
performance by any Member or the Company of its obligation hereunder, whether
before or after the termination of this Agreement, or as to any matter
whatsoever.

               (h) Effect of Award. The Arbitrator's decision with respect to
any matter referred to arbitration pursuant to the provisions of this Section
16.05 shall be final and binding upon the Company and the Members, as if the
Members had voted in favor of such resolution, and each Member and the Company
shall use its best efforts to take all such steps as may be within its power to
ensure that the matter determined by arbitration is carried out as if it had
received the approval of the Members of the Management Committee. The Members
agree that judgment on the arbitration award may be entered by any court of
competent jurisdiction.

         16.06 GOVERNING LAW: SEVERABILITY. (a) THIS AGREEMENT HAS BEEN EXECUTED
AND DELIVERED AND SHALL BE CONSTRUED, INTERPRETED AND GOVERNED PURSUANT TO AND
IN ACCORDANCE WITH THE LAWS OF THE STATE OF DELAWARE, WITHOUT REGARD TO ANY
CONFLICT OF LAWS PRINCIPLES

                                       56

<PAGE>   62




WHICH, IF APPLIED, MIGHT PERMIT OR REQUIRE THE APPLICATION OF THE LAWS OF
ANOTHER JURISDICTION.

         (b) In the event of a direct conflict between the provisions of this
Agreement and any mandatory provision of the Act or applicable law, the
applicable provision of the Act or other applicable law, as the case may be,
shall control. If any provision of this Agreement, or the application thereof to
any Person or circumstance, is held invalid or unenforceable to any extent, the
remainder of this Agreement and the application of that provision to other
Persons or circumstances shall not be affected thereby and that provision shall
be enforced to the greatest extent permitted by the Act or other applicable
law, as the case may be.

         16.07 FURTHER ASSURANCES. Subject to the terms and conditions set
forth in this Agreement, each of the Parties agrees to use all reasonable
efforts to take, or to cause to be taken, all actions, and to do, or to cause to
be done, all things necessary, proper or advisable under applicable Laws and
regulations to consummate and make effective the transactions contemplated by
this Agreement. In case, at any time after the execution of this Agreement, any
further action is necessary or desirable to carry out its purposes, the proper
officers or directors of the Parties shall take or cause to be taken all such
necessary action.

         16.08 WAIVER OF CERTAIN RIGHTS. Except as otherwise expressly provided
herein, each Member irrevocably waives any right it may have to maintain any
action for dissolution of the Company or for partition of the property of the
Company.

         16.09 NOTICE TO MEMBERS OF PROVISIONS OF THIS AGREEMENT. By executing
this Agreement, each Member acknowledges that it has actual notice of all of
the provisions of this Agreement. Each Member hereby agrees that this Agreement
constitute adequate notice of all such provisions.

         16.10 COUNTERPARTS. This Agreement may be executed in multiple of
counterparts, each of which, when executed, shall be deemed an original, and all
of which shall constitute but one and the same instrument.

         16.11 ATTENDANCE VIA COMMUNICATIONS EQUIPMENT. Unless otherwise
restricted by law or this Agreement, the Members or committees may hold a
meeting by means of conference telephone or other communications equipment by
means of which all persons participating in the meeting can effectively
communicate with each other. Such participation in a meeting shall constitute
presence in person at the meeting, except where a person participates in the
meeting for the express purpose of objecting to the transaction of any business
on the ground that the meeting is not lawfully called or convened.

         16.12 REPORTS TO MEMBERS. The officers of the Company shall present at
each annual meeting of Members, and at any special meeting of Members, a
statement of the business and condition of the Company.

                                       57

<PAGE>   63

         16.13 CHECKS, NOTES AND CONTRACTS. Checks and other orders for the
payment of money shall be signed by such person or persons as the Company shall
from time to time by resolution determine. Contracts and other instruments or
documents may be signed in the name of the Company by any other officer
authorized to sign such contract, instrument or document by the Company, and
such authority may be general or confined to specific instances. Checks and
other orders for the payment of money made payable to the Company may be
endorsed for deposit to the credit of the Company, with a depositary authorized
by resolution of the Company, by the Chief Financial Officer or Treasurer or
such other persons as the Company may from time to time by resolution determine.

         16.14 SEAL. The seal of the Company shall be in such form as shall from
time to time be adopted by the Company. The seal may be used by causing it or a
facsimile thereof to be impressed, affixed or otherwise reproduced.

         16.15 BOOKS AND RECORDS. The officers of the Company shall keep correct
and complete books and records of account and minutes of the proceedings of its
Members shall keep at its registered office or principal place of business, or
at the office of its transfer agent or registrar, a record of the Members,
giving the names and addresses of all Members and the number and class of the
shares held by each.

         16.16 SURETY BONDS. Such officers and agents of the Company (if any) as
the Company may direct, from time to time, shall be bonded for the faithful
performance of their duties and for the restoration to the Company, in case of
their death, resignation, retirement, disqualification or removal from office,
of all books, papers, vouchers, money and other property of whatever kind in
their possession or under their control belonging to the Company, in such
amounts and by such surety companies as the Company may determine. The premiums
on such bonds shall be paid by the Company and the bonds so furnished shall be
in the custody of the Secretary.

         16.17 AUDIT RIGHTS OF MEMBERS. Each Member shall have the right to
inspect and audit the books and records of the Company to the extent necessary
to determine the accuracy of the financial statements delivered to the Members
pursuant to Section 10.02 of the Agreement. The audit rights with respect to any
calendar year or any portion of such year shall terminate on and as of the last
day of the second calendar year immediately following the issuance of the
audited financial statements covering such calendar year. A Member may exercise
its audit rights hereunder by giving at least 30 days written notice to the
Company of the desire to perform such audit, which notice shall include the
estimated timing and other particulars related to such audit. The audit shall be
conducted at the sole cost of the Member requesting same and during normal
business hours of the Company. The audit shall not unreasonably interfere with
the operation for the Company.

         16.18 NO THIRD PARTY BENEFICIARIES. Except to the extent a third party
is expressly given rights herein, any agreement herein contained, expressed or
implied, shall be only for the benefit of the Parties and their respective legal
representatives, successors, and assigns, and such

                                       58

<PAGE>   64

agreements or assumption shall not inure to the benefit of any other Person
whomsoever, it being the intention of the parties hereto that no Person shall be
deemed a third party beneficiary of this Agreement except to the extent a third
party is expressly given rights herein.

         16.19 NOTICES. Except as otherwise expressly provided in this Agreement
to the contrary (including in the definition of the term Default), any notice
required or permitted to be given under this Agreement shall be in writing
(including telex, facsimile, telecopier or similar writing) and sent to the
address of the Party set forth below, or to such other more recent address of
which the sending Party actually has received written notice:

          (a)         if to the Company, to:

                      Poseidon Oil Pipeline Company, L.L.C.
                      Attn: President
                      1670 Broadway
                      Denver, Colorado 80202
                      Telephone           303/861-4475
                      Telecopy            303/860-3135

          (b)         if to the Members, to:

                      (1)        Poseidon Pipeline Company, L.L.C.
                                 Attn: Chief Operating Officer
                                 7200 Texas Commerce Tower
                                 600 Travis Street
                                 Houston, Texas 77002
                                 Telephone: (713) 224-7400
                                 Telecopy: (713) 547-5151

                      (2)        Texaco Trading and Transportation Inc.
                                 Attn: Senior Vice President - Southern Region
                                 4900 Fournace Place             P.O. Box 5080
                                 Bellaire, Texas 77401-2325      Bellaire, Texas
                                 Telephone 713/432-3800          77402-5080
                                 Telecopy 713/432-3592

Each such notice, demand or other communication shall be effective, if given by
registered or certified mail, return receipt requested, as of the third day
after the date indicated on the mailing certificate, or if given by any other
means, when delivered at the address specified in this Section.

                                       59

<PAGE>   65




         IN WITNESS WHEREOF, the Members have executed this Agreement as of the
date first set forth in this Agreement.

                                        MEMBERS:

                                        POSEIDON PIPELINE COMPANY, L.L.C.

                                        By: /s/ JAMES H. LYTAL
                                           ------------------------------------
                                        Printed Name: James H. Lytal
                                                      -------------------------
                                        Title: President
                                               --------------------------------

                                        TEXACO TRADING AND TRANSPORTATION INC.

                                        By: /S/ ARTHUR NICOLETTI
                                           ------------------------------------
                                           A.A. Nicoletti, President

EXHIBITS:

Exhibit A      -     Ownership Information
Exhibit B      -     Description of Phase I Line and Phase II Line
Exhibit C      -     Insurance







                                       60
<PAGE>   66

                             FIRST AMENDMENT TO THE
                       LIMITED LIABILITY COMPANY AGREEMENT
                                       OF
                      POSEIDON OIL PIPELINE COMPANY, L.L.C.
                     (A DELAWARE LIMITED LIABILITY COMPANY)

         THIS FIRST AMENDMENT dated as of July 1, 1996 (this "Amendment"), to
the Limited Liability Company Agreement (the "LLC Agreement") of Poseidon Oil
Pipeline Company, L.L.C. dated as of February 14, 1996, is entered into by the
Members (as defined below).

                              W I T N E S S E T H:

         WHEREAS, on February 14, 1996, TEXACO TRADING AND TRANSPORTATION INC.,
a Delaware corporation ("Texaco"), and POSEIDON PIPELINE COMPANY, L.L.C., a
Delaware limited liability company ("Poseidon"), formed the Delaware limited
liability company known as Poseidon Oil Pipeline Company, L.L.C. (the
"Company"), pursuant to its Certificate of Formation and the LLC Agreement; and

         WHEREAS, in connection with that certain Acknowledgment and Consent
Agreement dated as of even date herewith by and among the Company, Poseidon,
Texaco, Marathon Oil Company ("Marathon"), Texaco Pipeline Inc. ("TPLI"),
Marathon Pipeline Company ("MPLC") and Block 873 Pipeline Company ("Pipeline
Owner"), and certain other agreements, (i) Pipeline Owner contributed certain
assets to Company in exchange for a newly issued Membership Interest (defined
herein); (ii) Pipeline Owner distributed such Membership Interest to its owners,
TPLI and Marathon; and (iii) TPLI and MPLC transferred such Membership Interests
to Texaco and Marathon, respectively;

         WHEREAS, Poseidon, Texaco and Marathon are the current members of the
Company;

         WHEREAS, Poseidon, Texaco and Marathon (collectively, the "Members,"
and each a "Member") have agreed to amend the LLC Agreement.

         NOW, THEREFORE, in consideration of the premises contained herein and
for other good and valuable consideration, the sufficiency of which is hereby
acknowledged, the Members hereby stipulate and agree as follows:

         1. Definitions. Unless otherwise defined herein, terms defined in this
Amendment have the meanings specified herein, and capitalized terms not defined
herein, but defined in the LLC Agreement, are used herein as therein defined.



<PAGE>   67

         2. Amendments. The LLC Agreement shall be amended as of the date hereof
as follows:

                  (a) Section 1.01. Section 1.01 of the LLC Agreement is amended
         by adding the following definition in proper alphabetical order:

                           "Marathon" means Marathon Oil Company.

                  (b) Section 1.01. Section 1.01 of the LLC Agreement is further
         amended by deleting the definitions of the terms "Bankrupt Member,"
         "Default," "Majority Interest" and "Super-Majority Interest" in their
         entirety and replacing such terms with the following definitions, each
         in proper alphabetical order:

                           "Bankrupt Member" means any Member:

                           (a) that (i) makes a general assignment for the
                  benefit of creditors; (ii) files a voluntary bankruptcy
                  petition; (iii) becomes the subject of an order for relief or
                  is declared insolvent in any federal or state bankruptcy or
                  insolvency proceeding; (iv) files a petition or answer seeking
                  for the Member a reorganization, arrangement, composition,
                  readjustment, liquidation, dissolution, or similar relief
                  under any law; (v) files an answer or other pleading admitting
                  or failing to contest the material allegations of a petition
                  filed against the Member in a proceeding of the type described
                  in subclauses (i) through (iv) of this clause (a); or (vi)
                  seeks, consents, or acquiesces to the appointment of a
                  trustee, receiver, or liquidator of the Member or of all or
                  any substantial part of the Member's properties; or

                           (b) against which a proceeding seeking
                  reorganization, arrangement, composition, readjustment,
                  liquidation, dissolution, or similar relief under any law has
                  been commenced and 90 days have expired without dismissal
                  thereof or with respect to which, without the Member's consent
                  or acquiescence, a trustee, receiver, or liquidator of the
                  Member or of all or any substantial part of the Member's
                  properties has been appointed and 60 days have expired without
                  such appointments having been vacated or stayed, or 60 days
                  have expired after the date of expiration of a stay, if the
                  appointment has not previously been vacated.

                  In addition, Poseidon, and any of its Transferees or
                  Substituted Members, shall be deemed to be a Bankrupt Member
                  if any of the foregoing events occur with respect to the
                  Guarantor.

                           "Default" means, in respect of any Member, upon the
                  occurrence and during the continuation of any of the following
                  events:

                           (a) the failure to remedy within five (5) Business
                  Days of receipt of written notice thereof from the Company or
                  any Member, the failure of a Member to



                                       2
<PAGE>   68

                  make any Initial Capital Contribution to the Company as
                  required pursuant to Section 4.01, on the date on which such
                  Initial Capital Contribution is due;

                           (b) the occurrence of any event that causes such
                  Member to become a Bankrupt Member (except to the extent a
                  Majority Interest consents otherwise); or

                           (c) the failure to remedy within ten (10) Business
                  Days of receipt of written notice thereof, the default in
                  performance of or failure to comply with any other material
                  agreements, obligations or undertakings of such Member (or, in
                  the case of Poseidon, or any of its Transferees or Substituted
                  Members, the Guarantor) contained in the Transaction
                  Documents.

                           "Majority Interest" means two or more Members having
                  among them more than 50% of the Membership Interests of all
                  Members; provided, however that if at any time a single Member
                  shall own more than 50% of the Membership Interest of all
                  Members, then "Majority Interest" shall mean an amount which
                  is 1% greater than the Membership Interest held by such
                  Member.

                           "Super-Majority Interest" means one or more Members
                  having among them greater than 72% of the Membership Interests
                  of all Members.

                  (c) Section 1.03. Section 1.03 of the LLC Agreement shall be
         amended by adding the following sentence at the end of Section 1.03:

                           "Whenever the context requires, the singular shall
                  include the plural, and the plural, shall include the
                  singular."

                  (d) Section 5.06. Section 5.06 of the LLC Agreement is amended
         by deleting Section 5.06 in its entirety and replacing it with the
         following:

                           "5.06 Distribution Restrictions. Unless unanimously
                  agreed to in writing by the Members, and subject to the
                  provisions of Section 4.03, the Company shall not distribute
                  (i) any of the Initial Capital Contributions until the
                  completion of the construction of the Phase I Line, the Phase
                  II Line and the Onshore Segment of the Poseidon Pipeline,
                  except to the extent that all of the Members agree that the
                  applicable portion of such Initial Capital Contributions is no
                  longer needed to finance such construction or the operations
                  of the Company, or (ii) any amounts that would cause the
                  Company to materially breach, or would create a material
                  default under, any debt agreements or instruments to which the
                  Company is a party."

                  (e) Section 6.02. Subsection 6.02(c) of the LLC Agreement is
         amended by deleting Subsection 6.02(c) in its entirety and replacing it
         with the following:



                                       3
<PAGE>   69

                           "(c) Under the oversight of the Business Development
                  Committee, the representatives of the Members jointly shall
                  conduct the business development activities of the Company,
                  including, without limitation, identifying and negotiating
                  with potential customers. Each Member shall use all reasonable
                  efforts to ensure that its representatives cooperate with and
                  keep informed the representatives of the other Members with
                  respect to any business development activities conducted by
                  such representative on behalf of the Company. Each such
                  representative may independently approach any potential
                  customer or other Person and discuss such potential
                  arrangements; provided, however, that no such representative
                  may submit any formal proposal to a potential customer without
                  consulting with representatives of the other Members. The
                  Business Development Committee shall have the authority to
                  reconsider the business development procedures and
                  arrangements on an annual calendar year basis beginning with
                  the calendar year commencing on January 1, 1998. The Company
                  shall reimburse each Member (including its officers, agents
                  and other representatives) for reasonable costs associated
                  with business development services performed pursuant to this
                  Agreement.

                           (d) At least one year prior to any Day on which the
                  Company has a right to terminate any agreement with respect to
                  the operation and management of the Poseidon Pipeline, the
                  Operating Committee shall meet to consider the exercise of
                  such termination right. If the representatives of a Majority
                  Interest of the Members state at such meeting the desire of
                  such Members to bid, or to seek bids, with respect to such
                  operation and management activities, then the Operating
                  Committee shall establish procedures to govern such bidding
                  process and shall conduct such bidding process prior to the
                  time that the Company's right to terminate such agreement must
                  be exercised."

                  (f) Section 6.03. Section 6.03 of the LLC Agreement is amended
         by deleting Section 6.03 in its entirety and replacing it with the
         following:

                           "6.03 AUTHORITY OF MEMBERS AND COMMITTEES. (a) With
                  respect to conflicts or disagreements between and among any
                  committees, the Management Committee shall have ultimate
                  decision making authority. The Members and the committees
                  shall act through the Company's officers, employees,
                  representatives, agents and designees. No Member shall have
                  individual authority to bind the Company unless such is
                  expressly conferred upon them pursuant to this Agreement or by
                  action of the Members or a duly authorized committee, body,
                  officer or other representative. All action shall be taken
                  subsequent to resolutions approved by the Members in
                  accordance with Article VII of this Agreement.

                                    (b) Unless otherwise expressly delegated in
                           writing or provided by this Agreement, the Members
                           hereby reserve to the Members as a group the
                           authority to authorize and approve the following:



                                       4
<PAGE>   70

                                             (i) utilizing for other than
                                    Company purposes, acquiring, or disposing of
                                    any material asset of the Company;

                                             (ii) borrowing money;

                                             (iii) determining the reserve
                                    applicable to distributions of Company cash
                                    and other property as provided in Sections
                                    5.03, 5.05 and 5.06;

                                             (iv) authorizing transactions not
                                    in the ordinary course of business;

                                             (v) permitting the Company to
                                    merge, consolidate, participate in a share
                                    exchange or other statutory reorganization
                                    with, or sell all or substantially all of
                                    the assets of the Company to, any Person;

                                             (vi) permitting the Company to
                                    dissolve and liquidate;

                                             (vii) approving any operating and
                                    capital expenditures budgets for the
                                    Company;

                                             (viii) permitting a Member to
                                    withdraw from the Company;

                                             (ix) entering into contracts,
                                    agreements and other undertakings binding
                                    the Company to pay more than $500,000 in any
                                    year or $1,000,000 in the aggregate pursuant
                                    to any such individual contract, agreement
                                    or undertaking that may be necessary,
                                    appropriate, or advisable in furtherance of
                                    the purposes of the Company;

                                             (x) entering into Oil Contracts
                                    with a term of one year or more;

                                             (xi) authorizing the Company to
                                    enter into a transaction involving a Lateral
                                    Opportunity in accordance with Article XV;
                                    and

                                            (xii) entering into any transaction,
                                    including, without limitation, any purchase,
                                    sale, lease or exchange of property or the
                                    rendering of any service, with any Member or
                                    any Affiliate of any Member unless such
                                    transaction is upon fair and reasonable
                                    terms no less favorable to the Company than
                                    it would obtain in a comparable



                                       5
<PAGE>   71

                                    arm's length transaction with a Person which
                                    is not a Member or an Affiliate of a Member.

                                    With respect to each such matter described
                           in (i) - (xii) above, exercise of such authority
                           shall occur only by the affirmative vote of the
                           applicable Required Interest as required by the
                           Agreement, including the Majority Interest voting
                           requirements set forth in Section 7.01(a), the
                           Super-Majority Interest voting requirements set forth
                           in Section 7.02 and the unanimous Membership Interest
                           voting requirements otherwise set forth in this
                           Agreement, as applicable.

                                    (c) Member approval of or agreement to any
                           matter specified in Section 6.03(b)(ix) or (x), shall
                           be granted or withheld based only upon such Member's
                           good faith belief that such approval or agreement, or
                           the withholding of such approval or agreement, is in
                           the best interests of the Company.

                                    (d) Member approval of or agreement to any
                           matter specified in Section 6.03(b)(i), (v), (vi) or
                           (viii) or any borrowing which includes an interest
                           rate in excess of the prime interest rate charged by
                           Texas Commerce Bank, Houston, Texas office plus two
                           percent (2%), may be withheld by any Member for any
                           reason whatsoever.

                                    (e) Approval of or agreement to any other
                           matter will not be withheld by any Member (whether
                           acting directly through such Member or any committee)
                           without a reasonable basis."

                  (g) Section 7.01. Subsection 7.01(a) of the LLC Agreement is
         amended by deleting Subsection 7.01(a) in its entirety and replacing it
         with the following:

                           "(a) A quorum shall be present at a meeting of
                  Members or any committee of the Company if the holders of at
                  least 28.0% of all of the Membership Interests of the Company
                  are represented at the meeting in person or by proxy. At a
                  meeting of the Members at which a quorum is present with
                  respect to any matter (except for any matter requiring the
                  affirmative vote of (i) a Super-Majority Interest or all of
                  the Membership Interest as required by this Agreement or (ii)
                  a Required Interest greater than a Majority Interest as
                  required by this Agreement or the Act), the affirmative vote
                  of the Majority Interest shall be the act of the Members."

                  (h) Section 7.02. Section 7.02 of the LLC Agreement is amended
         by deleting Section 7.02 in its entirety and replacing it with the
         following:

                           "7.02 SPECIAL ACTIONS. The approval of the holders of
                  a Super-Majority Interest of the Members shall be required to
                  authorize and approve the following:



                                       6
<PAGE>   72

                                             (i) utilizing other than for
                                    Company purposes, acquiring, or disposing of
                                    any asset of the Company having a then
                                    existing fair market value or GAAP net book
                                    value (after deducting accumulated
                                    depreciation, depletion, amortization and
                                    impairment) of more than $5,000,000;

                                             (ii) borrowing money other than (x)
                                    pursuant to that certain Credit Agreement
                                    dated as of April 24, 1996, as amended,
                                    supplemented, restated or otherwise modified
                                    from time to time, among the Company, Texas
                                    Commerce Bank National Association, as the
                                    administrative agent and a lender, and the
                                    other lenders as a party thereto, (y)
                                    pursuant to any other credit agreement,
                                    indenture or similar agreement which has
                                    been authorized by a Super-Majority Interest
                                    (pursuant to this Section), and (z) in
                                    addition to the borrowing permitted pursuant
                                    to (x) and (y) above, an additional amount
                                    of money not to exceed $10,000,000.

                                             (iii) except with respect to
                                    reserves consistent with the historical
                                    practices of the Company, determining the
                                    reserve applicable to distributions of
                                    Company cash and other property as provided
                                    in Sections 5.03, 5.05 and 5.06;

                                             (iv) authorizing material
                                    transactions the nature of which are not in
                                    the ordinary course for the businesses in
                                    which the Company operates;

                                             (v) permitting the Company to
                                    merge, consolidate, participate in a share
                                    exchange or other statutory reorganization
                                    with, or sell all or substantially all of
                                    the assets of the Company to, any Person;

                                             (vi) permitting the Company to
                                    dissolve and liquidate; and

                                             (vii) entering into any
                                    transaction, including, without limitation,
                                    any purchase, sale, lease or exchange of
                                    property or the rendering of any service,
                                    with any Member or any Affiliate of any
                                    Member unless such transaction is upon fair
                                    and reasonable terms no less favorable to
                                    the Company than it would obtain in a
                                    comparable arm's length transaction with a
                                    Person which is not a Member or an Affiliate
                                    of a Member."



                                       7
<PAGE>   73

                  (i) Section 7.07. Subsection 7.07(a) of the LLC Agreement is
         amended by deleting Subsection 7.07(a) in its entirety and replacing it
         with the following:

                           "(a) Except as otherwise provided by law, any action
                  required or permitted to be taken at any meeting of Members or
                  committee of the Company may be taken without a meeting, and
                  without a vote, if a consent or consents in writing, setting
                  forth the action so taken, shall be signed by the holder or
                  holders or representatives of not less than the minimum of
                  Membership Interests that would be necessary to take such
                  action at a meeting at which the holders of all Membership
                  Interests entitled to vote on the action were present and
                  voted; provided, however, that no such written consent shall
                  be effective unless each Member has been provided with at
                  least 3 Business Days prior written notice of such consent to
                  be sought or has waived the requirement of such notice. To the
                  extent required by law, every written consent shall bear the
                  date of signature of each Member or Member representative who
                  signs the consent. To the extent required by law, no written
                  consent shall be effective to take the action that is the
                  subject to such consent unless, within 60 days after the date
                  of the earliest dated consent delivered to the Company in the
                  manner required by this Section 7.07, a consent or consents
                  signed by the holder or holders of not less than the minimum
                  Membership Interests that would be necessary to take the
                  action that is the subject of the consent are delivered to the
                  Company by delivery to its registered office or its principal
                  place of business. Delivery shall be by hand or certified or
                  registered mail (return receipt requested) to the Company's
                  principal place of business and shall be addressed to the
                  Secretary of the Company. A telegram, telex, cablegram or
                  similar transmission by a Member or Member representative, or
                  a photographic, photostatic, facsimile or similar reproduction
                  of a writing signed by a Member or Member representative,
                  shall be regarded as signed by the Member or Member
                  representative for purposes of this Section 7.07. In addition
                  to the prior written notice described above, prompt written
                  notice of the taking of any action by the Members or
                  committees of the Company without a meeting by less than
                  unanimous written consent shall be given to those Members or
                  Member representatives who did not consent in writing to the
                  action."

                  (j) Section 11.01. Section 11.01 of the LLC Agreement is
         amended by deleting Section 11.01 in its entirety and replacing it with
         the following:

                           "11.01. BANKRUPT MEMBERS. Subject to Section
                  12.01(c), if any Member becomes a Bankrupt Member (except to
                  the extent a Majority Interest consents otherwise), the
                  Company or, if the Company does not exercise the relevant
                  option, the remaining Members which desire to participate,
                  shall have the option, exercisable by notice from the Company
                  or the Members, as the case may be, to the Bankrupt Member (or
                  its representative) at any time prior to the 180th day after
                  receipt of notice of the occurrence of the event causing it to
                  become a Bankrupt Member, to buy, and, on the exercise of this
                  option, the Bankrupt Member or its representative shall sell,
                  its Membership Interest. The purchase price shall be an



                                       8
<PAGE>   74

                  amount equal to the fair market value thereof determined by
                  agreement by the Bankrupt Member (or its representative) and
                  the purchasing Person; however, if those Persons do not agree
                  on the fair market value on or before the 30th day following
                  the exercise of the option, either such Person, by written
                  notice to the other, may require the determination of fair
                  market value to be made by an independent appraiser specified
                  in such notice. If the Person receiving that notice objects on
                  or before the tenth day following receipt to the independent
                  appraiser designated in that notice, and those Persons
                  otherwise fail to agree on an independent appraiser, either
                  such Person may petition the United States District Judge for
                  the Southern District of Texas then senior in active service
                  to designate an independent appraiser, whose determination of
                  the independent appraiser, however designated, is final and
                  binding on all parties. The Bankrupt Member and the purchasing
                  Person each shall pay one-half of the costs of the appraisal
                  and court costs in appointing an appraiser (if any). The
                  purchasing Person shall pay the fair market value as so
                  determined in cash on closing. The payment to be made to the
                  Bankrupt Member or its representative pursuant to this Section
                  11.01 is in complete liquidation and satisfaction of all the
                  rights and interest of the Bankrupt Member and its
                  representative (and of all Persons claiming by, through, or
                  under the Bankrupt Member and its representative) in and in
                  respect of the Company, including, without limitation, any
                  Membership Interest, any rights in specific Company property,
                  and any rights against the Company and its officers, agents,
                  and representatives and (insofar as the affairs of the Company
                  are concerned) against the Members."

                  (k) Section 14.05. Section 14.05 of the LLC Agreement is
         amended by deleting Section 14.05 in its entirety and replacing it with
         the following:

                           "14.05 Restrictive Legend. In the absence of a more
                  restrictive legend, all certificates which evidence Membership
                  Interests shall be stamped or typed in a conspicuous place
                  with the following legend:

                           THE INTEREST REPRESENTED BY THIS CERTIFICATE IS
                           SUBJECT TO THE LIMITED LIABILITY AGREEMENT OF THE
                           COMPANY DATED AS OF FEBRUARY 14, 1996, AS IT EXISTS
                           FROM TIME TO TIME, WHICH RESTRICTS ANY SALE,
                           ASSIGNMENT, TRANSFER, CONVEYANCE, ENCUMBRANCE, PLEDGE
                           OR OTHER TRANSFER OR ALIENATION (WITH OR WITHOUT
                           CONSIDERATION) OF SUCH INTEREST. THE COMPANY WILL
                           FURNISH TO THE RECORD HOLDER OF THIS CERTIFICATE,
                           WITHOUT CHARGE, UPON WRITTEN REQUEST TO THE COMPANY
                           AT ITS PRINCIPAL PLACE OF BUSINESS, A COPY OF SUCH
                           LIMITED LIABILITY AGREEMENT. THE SECURITIES
                           REPRESENTED BY THIS CERTIFICATE HAVE BEEN ACQUIRED
                           FOR INVESTMENT AND HAVE NOT BEEN REGISTERED UNDER THE
                           SECURITIES ACT OF 1933, AS AMENDED, OR THE SECURITIES
                           LAWS OF ANY STATE.



                                       9
<PAGE>   75

                           WITHOUT SUCH REGISTRATION, SUCH SECURITIES MAY NOT BE
                           SOLD, ASSIGNED, TRANSFERRED, CONVEYED, PLEDGED,
                           HYPOTHECATED, OR OTHERWISE TRANSFERRED, EXCEPT UPON
                           DELIVERY TO THE COMPANY OF AN OPINION OF COUNSEL
                           SATISFACTORY TO THE COMPANY THAT SUCH REGISTRATION IS
                           NOT REQUIRED FOR SUCH TRANSFER.

                  Such legend shall also be placed on all Certificates which are
                  hereafter issued to any Member."

                  (l) Section 15.01. Subsection 15.01(a) of the LLC Agreement is
         amended by deleting Subsection 15.01(a) in its entirety and replacing
         it with the following:

                           "(a) Except as otherwise provided in Section 15.01(b)
                  and (c), each Member agrees that neither it nor its Affiliates
                  will, directly or indirectly, enter into any agreement to
                  construct or otherwise consummate transactions involving
                  construction of any pipeline laterals or extensions or related
                  facilities (a "Lateral Opportunity") to connect any oil or
                  liquid condensate to the Poseidon Pipeline until such Lateral
                  Opportunity has been rejected or otherwise forfeited by the
                  Company and the Members, as applicable, pursuant to this
                  Article. Notwithstanding the foregoing, this Article shall not
                  prevent any exploration and production Affiliate of a Member
                  (or, as to a Member that conducts its own exploration and
                  production, the exploration and production division of such
                  Member) from constructing a pipeline lateral solely for the
                  purpose of transporting crude oil produced in whole or in part
                  from a lease in which such Affiliate or division owns an
                  interest; provided that such interest in the crude oil to be
                  transported by such lateral was acquired by the relevant
                  Affiliate or division primarily for a purpose other than the
                  avoidance of the provisions of this Section. Any Member may
                  propose that the Company undertake a Lateral Opportunity by
                  delivering written notice (a "Lateral Opportunity Notice") to
                  the Company and each of the other Members, which Lateral
                  Opportunity Notice would include the proposed terms and
                  conditions of such transactions and reasonably sufficient
                  operational and financial information and other details to
                  allow such Members to make a reasonably informed decision with
                  respect to such Lateral Opportunity. If Members holding at
                  least a Majority Interest do not agree and deliver notice
                  thereof in writing within thirty (30) days after the Company
                  receives the Lateral Opportunity Notice that the Company
                  should undertake such project on the terms and conditions set
                  forth in the applicable Lateral Opportunity Notice, any Member
                  (including its Affiliates) voting in favor of such project
                  shall have the right to pursue such project (a "Rejected
                  Lateral Opportunity") on the terms and conditions set forth in
                  the applicable Lateral Opportunity Notice and own any assets
                  related thereto in the proportion that such Member's
                  Membership Interest is to the Membership Interest of all
                  Members electing to participate in the Rejected Lateral
                  Opportunity by giving written notice of such intent to the
                  Company within fifty (50) days after the Company receives the
                  relevant Lateral Opportunity Notice. In such



                                       10
<PAGE>   76

                  event, the Members (or their Affiliates) desiring to pursue
                  such Rejected Lateral Opportunity shall be free for a period
                  of sixty (60) days after such fifty (50) day period to enter
                  into definitive agreements, if any, or otherwise consummate
                  the transactions contemplated by the applicable Lateral
                  Opportunity Notice on the same terms and conditions set forth
                  in the applicable Lateral Opportunity Notice without further
                  obligation to any Members or the Company; provided that
                  following such sixty (60) day period such Members or their
                  Affiliates may not enter into definitive agreements, if any,
                  or otherwise consummate the transactions with respect to a
                  Rejected Lateral Opportunity without again offering the same
                  to the Company in accordance with this Article. No Member
                  shall have any obligation or duty to the Company or the other
                  Members with respect to any Rejected Lateral Opportunity to
                  the extent it is covered by definitive agreements entered
                  into, or otherwise consummated, by such Members or their
                  Affiliates after compliance with this Section 15.01 or with
                  respect to any modification, renewal or extension of the terms
                  of such definitive agreements with respect to any such
                  Rejected Lateral Opportunity. Except as set forth in this
                  Section, the construction, operation, maintenance and
                  ownership of each such Rejected Lateral Opportunity project
                  shall not be governed or affected by this Agreement, but shall
                  be governed by the contractual and other arrangements
                  established by the Members participating in such project. Any
                  Member which delivers a Lateral Opportunity Notice or elects
                  to participate in a Rejected Lateral Opportunity shall deliver
                  a certificate executed by an executive or similar officer of
                  such Member to each other Member certifying that: (i) such
                  Lateral Opportunity or Rejected Lateral Opportunity is not,
                  directly or indirectly, related in any way to any past,
                  current or future-contemplated transaction involving the
                  certifying Member not described in the Lateral Opportunity
                  Notice and (ii) taken as a whole and, in light of the
                  circumstances in which the same were made, the Lateral
                  Opportunity Notice does not and will not, to the best
                  knowledge of the certifying Member, as of the date when made,
                  contain any untrue statement of a material fact or omit to
                  state a material fact (other than omissions that pertain to
                  matters of a general economic nature, matters generally known
                  to each Member, or matters of public knowledge that generally
                  affect any of the industry segments included in the business
                  of the Company) necessary in order to make the statements
                  contained therein not misleading, and all financial
                  projections contained in any Lateral Opportunity Notice have
                  been prepared in good faith based upon assumptions believed by
                  the Member to be reasonable. Any breach of a representation or
                  warranty contained in such certificate shall be deemed to be a
                  breach of a representation or warranty contained in this
                  Agreement."

                  (m) Section 16.05. Subsection 16.05(a) of the LLC Agreement is
         amended by deleting Subsection 16.05(a) in its entirety and replacing
         it with the following:

                           "(a) Member and Committee Deadlocks. Member approval
                  or disapproval of the matters specified in Section 6.03(b)(i),
                  (v), (vi) or (viii), or of any borrowing which includes an
                  interest rate in excess of the prime interest rate



                                       11
<PAGE>   77

                  charged by Texas Commerce Bank, Houston, Texas office plus two
                  percent (2%), shall not be subject to arbitration under this
                  Agreement. If any matter or proposal (other than those matters
                  specified in Section 6.03(b)(i), (v), (vi) or (viii) or any
                  borrowing which includes an interest rate in excess of the
                  prime interest rate charged by Texas Commerce Bank, Houston,
                  Texas office plus two percent (2%)) requiring the vote of less
                  than all of the Membership Interest for approval thereof is
                  brought before the Members or the Management Committee and
                  receives neither (x) at least the Required Interest voting for
                  such matter or proposal nor (y) at least the Required Interest
                  voting against (not including abstentions or other non-votes)
                  such matter or proposal, then any Member, by written notice to
                  the other Members given within ten (10) days after the initial
                  vote on such matter or proposal, may call a meeting of the
                  Members or the Management Committee to reconsider such matter
                  or proposal, such meeting to be held when, where and as
                  reasonably specified in said notice, but not less than ten
                  (10) days nor more than twenty-five (25) days after the date
                  of such vote. If such meeting is called and held as herein
                  provided and the matter or proposal at such meeting again and
                  (x) does not receive at least the Required Interest voting for
                  such matter or proposal or (y) does not receive at least the
                  Required Interest voting against (not including abstentions or
                  other non-votes) such matter or proposal, then any Member may
                  within ten (10) days thereafter submit the matter to
                  arbitration in accordance with Section 16.05(b) - (h). If no
                  Member calls such a meeting within the first ten (10) day
                  period herein provided for or if arbitration is not requested
                  within the ten (10) day period after the second meeting, no
                  Member shall thereafter have any right to request arbitration
                  regarding such matter or proposal.

                  (n) Section 16.05. Subsection 16.05(b) of the LLC Agreement is
         amended by deleting Subsection 16.05(b) in its entirety and replacing
         it with the following:

                           "(b) Initiation of Proceedings, Costs. Any Member
                  wishing to submit a matter or proposal to arbitration as
                  permitted by Section 16.05(a) shall do so by giving written
                  notice of arbitration to the other Members and the Company.
                  The Member initiating arbitration shall also simultaneously
                  file duplicate copies of its notice of arbitration with any
                  regional office of the American Arbitration Association
                  ("AAA"), together with the appropriate fee as provided in the
                  AAA's administrative fee schedule. The initiating Member shall
                  state in its notice of arbitration the regional office of AAA
                  it has selected and thereafter all communications with the AAA
                  regarding the arbitration proceedings shall be directed to
                  such office unless the AAA directs otherwise. The notice of
                  arbitration shall contain a brief description of the nature of
                  the dispute to be arbitrated and the remedy or resolution
                  sought by the Member initiating arbitration. Such notice may
                  also contain a request that the dispute be arbitrated by a
                  panel of three arbitrators. If no such request is contained in
                  the notice, it shall be presumed that the Member seeking
                  arbitration desires the dispute to be determined by a single
                  arbitrator. Each Member shall bear its own costs incurred



                                       12
<PAGE>   78

                  in connection with preparing responses and proposals for
                  arbitration and retaining separate counsel to represent such
                  Member. The Company shall pay the fees of the arbitrators and
                  any other costs related to the arbitration."

                  (o) Exhibit A2. The LLC Agreement is amended by adding Exhibit
         A2 attached hereto which sets forth the initial capital contributions
         to be made by Marathon and additional initial capital contributions to
         be made by Texaco in connection with the admission of Marathon as a
         Member.

                  (p) Exhibit C. Exhibit C to the LLC Agreement is amended by
         deleting Exhibit C in its entirety and replacing it with Exhibit C
         attached hereto.

         3. Representations and Warranties. Each Member hereby represents and
warrants to each other Member that, after giving effect to the amendments
provided for herein, the representations and warranties contained in the LLC
Agreement will be true and correct in all material respects as if made on and as
of the date hereof (unless such representations or warranties are stated to
refer to a specific earlier date, in which case such representations and
warranties shall be true and correct in all material respects as of such earlier
date) and that no Default or Event of Default will have occurred and be
continuing.

         4. No Other Waivers or Amendments. Except as expressly waived or
amended hereby, the LLC Agreement shall remain in full force and effect in
accordance with its terms, without any waiver, amendment or modification of any
provision thereof.

         5. Counterparts. This Amendment may be executed by one or more of the
parties hereto on any number of separate counterparts and all of said
counterparts taken together shall be deemed to constitute one and the same
instrument.



                                       13
<PAGE>   79

         IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
duly executed and delivered as of the day and year first above written.


                                       POSEIDON PIPELINE COMPANY, L.L.C.


                                       By: /s/ JAMES H. LYTAL
                                          --------------------------------------
                                       Name:   James H. Lytal
                                            ------------------------------------
                                       Title:  President
                                             -----------------------------------


                                       TEXACO TRADING AND TRANSPORTATION INC.


                                       By: /s/ TERRY F. HUDGENS
                                          --------------------------------------
                                       Name:   Terry F. Hudgens
                                            ------------------------------------
                                       Title:  Vice President
                                             -----------------------------------


                                       MARATHON OIL COMPANY


                                       By: /s/ KEVIN M. HENNING
                                          --------------------------------------
                                       Name:   Kevin M. Henning
                                            ------------------------------------
                                       Title:  Vice President
                                             -----------------------------------


Exhibit A2: Ownership Information
Exhibit C: Insurance



<PAGE>   80

                                    EXHIBIT A2
                              OWNERSHIP INFORMATION

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------
          NAME AND INITIAL CAPITAL             ADDITIONAL INITIAL     MEMBERSHIP
         CONTRIBUTION OF EACH MEMBER                 CAPITAL           INTEREST
                                                  CONTRIBUTIONS
- --------------------------------------------------------------------------------
<S>                                            <C>                   <C>
1)   Poseidon Pipeline Company, L.L.C.                                   36.0%
- --------------------------------------------------------------------------------
2)   Texaco Trading and Transportation Inc.(3)          (1)              36.0%
- --------------------------------------------------------------------------------
3)   Marathon Oil Company                               (2)              28.0%
- --------------------------------------------------------------------------------
</TABLE>


(1)      Texaco shall make additional Initial Capital Contributions by causing
         Block 873 Pipeline Company to contribute the Block 873 Pipeline to the
         Company at an agreed value, net to the interest of Texaco and its
         Affiliates, of $10.0 million.

(2)      Marathon shall make Initial Capital Contributions equal to:

         (a)      Contribution of $5.2 million via wire transfer of immediately
                  available federal funds on the date of execution of this
                  Agreement.

         (b)      Causing Block 873 Pipeline Company to contribute the Block 873
                  Pipeline to the Company at an agreed value, net to the
                  interest of Marathon and its Affiliates, of $20.0 million.

(3)      Initial Tax Matters Member.



                                      A2-1
<PAGE>   81

                                    EXHIBIT C
                                    INSURANCE

         Coverage                   Limit of Liability            Deductible(1)
         --------                   ------------------            -------------

I.    EACH MEMBER WILL CARRY FOR ITS OWN BENEFIT AND THE BENEFIT OF THE COMPANY
      ITS PROPORTIONATE SHARE EQUAL TO ITS MEMBERSHIP INTEREST OF EACH OF THE
      FOLLOWING:

<TABLE>
      <S>                                         <C>                               <C>
      A.  Property:(2)

          1.  Pipelines                           $20,000,000                       $250,000
          2.  Line Pack                           $2,000,000                        $250,000
          3.  Equipment                           $2,000,000.                       $250,000.
          4.  Cargo                               $4,000,000 a.o.a.o                $25,000 a.o.a.o

      B.  Excess Liability including              $200,000,000 a.o.a.o. and in      Excess of Primary
          pollution Liability                     the aggregate annually as         Insurance as below
                                                  respects Products Liability
</TABLE>

II.   TO BE CARRIED BY THE COMPANY:

<TABLE>
      <S>                                         <C>                               <C>
      A.   Liabilities:

          1.   General Liability to include        $1,000,000 a.o.a.o. and in       $50,000
               Marine Liability, Pollution         the aggregate annually as
               Liability, Contractual Liability    respects Products Liability
               and Action-Over Indemnity,
               Non-Owned Watercraft
          2.   W.C./EL/Maritime Employees          Per Statute/$1,000,000            N/A
               Liability
          3.   Automobile Liability                $2,000,000 a.o.a.o.               N/A
          4.   Non-Owned Aviation Liability        $10,000,000 a.o.a.o.              N/A
</TABLE>



- --------
(1) Texaco shall have the right to self-insure for an amount equal to the
retention under Texaco's corporate insurance program, subject to a limit of $10
million. Marathon shall have the right to self-insure for an amount equal to the
retention under Marathon's corporate insurance program, subject to a limit of
$15,000,000 for environmental loss and $50,000,000 for other types of coverage.

(2) All deductible amounts in Section I are stated in total deductible amounts,
to be apportioned among the Members pro rata in accordance with their Membership
Interests.



                                      C-1
<PAGE>   82

III.  IF OPERATIONS INVOLVED OWNED OR BAREBOAT CHARTERED WATERCRAFT THESE
      COVERAGES WILL BE CARRIED BY THE COMPANY:

<TABLE>
      <S>                             <C>                              <C>
      A.   Hull/Machinery,            $10,000,000 a.o.a.o.             $10,000
           including Collision
           Liability to hull value.

      B.   Protection & Indemnity,    $1,000,000 a.o.a.o.              $25,000
           including crew coverage
           and Excess Collision
           Liability
</TABLE>


                                      C-2

<PAGE>   1

                                                                   EXHIBIT 10.15


                       LIMITED LIABILITY COMPANY AGREEMENT


                                       OF


                        NEPTUNE PIPELINE COMPANY, L.L.C.


                     (a Delaware limited liability company)


                         (Dated as of January 17, 1997)






<PAGE>   2


                                TABLE OF CONTENTS

<TABLE>
<S>                                                                                                            <C>
ARTICLE I. DEFINITIONS............................................................................................1
   1.1     Specific Definitions...................................................................................1
   1.2     Other Terms...........................................................................................17
   1.3     Construction..........................................................................................17

ARTICLE II. ORGANIZATION.........................................................................................18
   2.1     Formation.............................................................................................18
   2.2     Name..................................................................................................18
   2.3     Principal Office in the United States; Other Offices..................................................18
   2.4     Purpose...............................................................................................18
   2.5     Foreign Qualification.................................................................................18
   2.6     Term..................................................................................................18
   2.7     Mergers and Exchanges.................................................................................18
   2.8     Business Opportunities--No Implied Duty or Obligation.................................................18

ARTICLE III. MEMBERSHIP INTERESTS AND TRANSFERS..................................................................19
   3.1     Initial Members.......................................................................................19
   3.2     Number of Members.....................................................................................19
   3.3     Membership Interests..................................................................................19
   3.4     Representations and Warranties........................................................................20
   3.5     Restrictions on the Transfer of a Membership Interest.................................................21
   3.6     Transfer Restrictions.................................................................................22
   3.7     Documentation; Validity of Transfer...................................................................25
   3.8     [Reserved.............................................................................................26
   3.9     Possible Additional Restrictions on Transfer..........................................................26
   3.10    Additional Membership Interests.......................................................................26
   3.11    Code Section 708 Transfers............................................................................26
   3.12    Information...........................................................................................27
   3.13    Liability to Third Parties............................................................................28
   3.14    Resignation...........................................................................................28
   3.15    Lack of Member Authority..............................................................................28
   3.16    [Reserved.............................................................................................28
   3.17    Failure to Accept Nautilus Construction Certificate...................................................28
   3.18    Other Contingencies...................................................................................30

ARTICLE IV. CAPITAL CONTRIBUTIONS................................................................................32
   4.1     Initial Capital Contributions.........................................................................32
   4.2     Subsequent Contributions..............................................................................34
   4.3     Failure to Contribute.................................................................................34
   4.4     Return of Contributions...............................................................................37
   4.5     Capital Accounts......................................................................................37

ARTICLE V. ALLOCATIONS AND DISTRIBUTIONS.........................................................................40
   5.1     Allocations for Capital Account Purposes..............................................................40
   5.2     Allocations for Tax Purposes..........................................................................43
   5.3     Requirement of Distributions..........................................................................45
   5.4     Pro Rata Distributions................................................................................45
   5.5     Reserves..............................................................................................45
   5.6     Distribution Restrictions.............................................................................45
   5.7     Special Distributions and Contributions...............................................................46
</TABLE>

                                       ii

<PAGE>   3


<TABLE>
<S>                                                                                                            <C>
ARTICLE VI. MANAGEMENT OF THE COMPANY............................................................................46
   6.1     Management by the Members and Delegation of Authority.................................................46
   6.2     Committees............................................................................................46
   6.3     Authority of Members and Committees...................................................................47
   6.4     Officers..............................................................................................49
   6.5     Duties of Officers....................................................................................51
   6.6     No Duty to Consult....................................................................................51
   6.7     Reimbursement.........................................................................................51
   6.8     Members and Affiliates Dealing With the Company.......................................................51
   6.9     Insurance.............................................................................................51

ARTICLE VII. MEETINGS............................................................................................52
   7.1     Meetings of Members and Committees....................................................................52
   7.2     Special Actions.......................................................................................53
   7.3     Voting List...........................................................................................57
   7.4     Proxies...............................................................................................57
   7.5     Votes.................................................................................................58
   7.6     Conduct of Meetings...................................................................................58
   7.7     Action by Written Consent.............................................................................58
   7.8     Records...............................................................................................59

ARTICLE VIII. INDEMNIFICATION....................................................................................59
   8.1     Right to Indemnification..............................................................................59
   8.2     Indemnification of Officers, Employees and Agents.....................................................60
   8.3     Advance Payment.......................................................................................60
   8.4     Appearance as a Witness...............................................................................61
   8.5     Nonexclusivity of Rights..............................................................................61
   8.6     Insurance.............................................................................................61
   8.7     Member Notification...................................................................................61
   8.8     Savings Clause........................................................................................61
   8.9     Scope of Indemnity....................................................................................61

ARTICLE IX. TAXES................................................................................................61
   9.1     Tax Returns...........................................................................................61
   9.2     Tax Elections.........................................................................................62
   9.3     Tax Matters Member....................................................................................62

ARTICLE X. BOOKS, RECORDS, REPORTS, AND BANK ACCOUNTS............................................................62
   10.1    Maintenance of Books..................................................................................62
   10.2    Financial Statements..................................................................................63
   10.3    Tax Statements........................................................................................63
   10.4    Accounts..............................................................................................63

ARTICLE XI. BANKRUPTCY OF A MEMBER...............................................................................64
   11.1    Bankrupt Members......................................................................................64

ARTICLE XII. DISSOLUTION, LIQUIDATION, AND TERMINATION...........................................................65
   12.1    Dissolution...........................................................................................65
   12.2    Liquidation and Termination...........................................................................65
   12.3    Provision for Contingent Claims.......................................................................67
   12.4    Deficit Capital Accounts..............................................................................68

ARTICLE XIII. AMENDMENT OF THE AGREEMENT.........................................................................68
   13.1    Amendments to be Adopted by the Company...............................................................68
   13.2    Amendment Procedures..................................................................................69
</TABLE>

                                      iii


<PAGE>   4


<TABLE>
<S>                                                                                                            <C>
ARTICLE XIV. CERTIFICATED MEMBERSHIP INTERESTS...................................................................69
   14.1    Entitlement to Certificates...........................................................................69
   14.2    Multiple Classes of Interest..........................................................................69
   14.3    Signatures............................................................................................69
   14.4    Issuance and Payment..................................................................................70
   14.5    Restrictive Legend....................................................................................70
   14.6    Lost, Stolen or Destroyed Certificates................................................................70
   14.7    Transfer of Membership Interest.......................................................................71
   14.8    Registered Holders....................................................................................71

ARTICLE XV. OTHER MEMBER AGREEMENTS AND OBLIGATIONS..............................................................71
   15.1    Lateral Opportunities.................................................................................71
   15.2    Expansions............................................................................................73
   15.3    Certain Properties....................................................................................76

ARTICLE XVI. GENERAL PROVISIONS..................................................................................76
   16.1    Offset................................................................................................76
   16.2    Entire Agreement; Supersedure.........................................................................76
   16.3    Waivers...............................................................................................76
   16.4    Binding Effect........................................................................................76
   16.5    Member Deadlocks; Negotiations and Mediation..........................................................76
   16.6    Governing Law; Severability...........................................................................78
   16.7    Further Assurances....................................................................................78
   16.8    Exercise of Certain Rights............................................................................79
   16.9    Notice to Members of Provisions of this Agreement.....................................................79
   16.10   Counterparts..........................................................................................79
   16.11   Attendance via Communications Equipment...............................................................79
   16.12   Reports to Members....................................................................................80
   16.13   Checks, Notes and Contracts...........................................................................80
   16.14   Seal..................................................................................................80
   16.15   Books and Records.....................................................................................80
   16.16   Surety Bonds..........................................................................................80
   16.17   Audit Rights of Members...............................................................................80
   16.18   No Third Party Beneficiaries..........................................................................81
   16.19   Notices...............................................................................................81
   16.20   Remedies..............................................................................................82
   16.21   Disputes..............................................................................................82
   16.22   No Shop...............................................................................................86
   16.23   Member Trademarks.....................................................................................86
   16.24   Holding-Out...........................................................................................87
</TABLE>

                                       iv

<PAGE>   5


                       LIMITED LIABILITY COMPANY AGREEMENT


                                       OF

                        NEPTUNE PIPELINE COMPANY, L.L.C.
                     (A DELAWARE LIMITED LIABILITY COMPANY)


         This Limited Liability Company Agreement of Neptune Pipeline Company,
L.L.C., dated as of January 17, 1997 (the "Formation Date"), is (a) adopted by
the Members (as defined below) and (b) executed and agreed to, for good and
valuable consideration, by the Members.

         WHEREAS, the Members desire to form the Company (defined below) in
connection with the acquisition, construction, ownership and operation of
certain pipelines;

         WHEREAS, the Company will own interests in Manta Ray Offshore Gathering
Company, L.L.C. ("Manta Ray") and Nautilus Pipeline Company, L.L.C.
("Nautilus"); and


         WHEREAS, Manta Ray and Nautilus will acquire, construct, own and
operate the Manta Ray System and the Nautilus System (each defined below),
respectively.

         NOW, THEREFORE, for and in consideration of the premises and the mutual
covenants and agreements contained herein and other good and valuable
consideration (the receipt and sufficiency of which are hereby confirmed and
acknowledged), the parties hereto hereby stipulate and agree as follows:

                                   ARTICLE I.
                                   DEFINITIONS

         1.1 SPECIFIC DEFINITIONS. As used in this Agreement, the following
terms have the following meanings:

                  "Accelerated Volumes" means the increment of natural gas
volumes produced from existing, flowing Dedicated Leases which require a Major
Expansion Project pursuant to Section 15.2, provided that such volumes, for the
purposes of this definition, shall be limited to Dedicated Leases from which the
increases in volume are attributable to an acceleration of reserves production,
and not an increase in overall reserves.

                  "Accessible Capacity" means that portion of the Base Capacity
which is commercially useable for gas gathering or transportation taking into
consideration hydraulics, geographic proximity and other similar factors to
transport relevant Expansion Property Production.

<PAGE>   6


                  "Act" means the Delaware Limited Liability Company Act and any
successor statute, as amended from time to time.

                  "Adjusted Capital Account" means the Capital Account
maintained for each Member as of the end of each taxable year of the Company,
(a) increased by any amounts that such Member is obligated to restore under the
standards set by Treasury Regulation section 1.704-1(b)(2)(ii)(c) (or is deemed
obligated to restore pursuant to the penultimate sentences of Treasury
Regulation sections 1.704-2(g)(1) and 1.704-2(i)(5)), and (b) decreased by (i)
the amount of all losses and deductions that, as of the end of such taxable
year, are reasonably expected to be allocated to such Member in subsequent years
under sections 704(e)(2) and 706(d) of the Code and Treasury Regulation section
1.751-1(b)(2)(ii), and (ii) the amount of all distributions that, as of the end
of such taxable year, are reasonably expected to be made to such Member in
subsequent years in accordance with the terms of this Agreement or otherwise to
the extent they exceed offsetting increases to such Member's Capital Account
that are reasonably expected to occur during (or prior to) the year in which
such distributions are reasonably expected to be made (other than increases as a
result of a minimum chargeback pursuant to Section 5.1(d) or 5.1(e)). The
foregoing definition of Adjusted Capital Account is intended to comply with the
provisions of Treasury Regulation section 1.704-1(b)(2)(ii)(d) and shall be
interpreted consistently therewith.

                  "Adjusted Property" means any property, the Carrying Value of
which has been adjusted pursuant to Section 4.5(a) and (d). Once an Adjusted
Property is deemed distributed by, and recontributed to, the Company for federal
income tax purposes upon a termination thereof pursuant to section 708 of the
Code, such property shall thereafter constitute a Contributed Property until the
Carrying Value of such property is further adjusted pursuant to Section 4.5.

                  "Affiliate" means, with respect to any relevant Person, any
other Person that directly or indirectly controls, is controlled by, or is under
common control with, such relevant Person in question. As used herein, the term
"control" (including its derivatives and similar terms) means owning, directly
or indirectly, the power (i) to vote ten percent (10%) or more of the Voting
Stock of any such relevant Person or (ii) to direct or cause the direction of
the management and policies of any such relevant Person.

                  "Agreement" means this Limited Liability Company Agreement
(including any schedules, exhibits or attachments hereto), as amended,
supplemented or modified from time to time.

                  "Arbitrator" has the meaning given that term in Section 16.21.

                  "Arbitration Notice" has the meaning given that term in
Section 16.21.

                  "Asset Value" of any Contributed Property means the fair
market value of such property or other consideration at the time of contribution
as determined by the

                                       2

<PAGE>   7

Company using such reasonable method of valuation as it may adopt. The Company
shall, in its sole discretion, use such method as it deems reasonable and
appropriate to allocate the aggregate Asset Value of Contributed Properties in a
single or integrated transaction among such properties on a basis proportional
to their fair market value. The fair market value of the Contributed Properties
described on Exhibit A shall be deemed to be the Asset Value of such Contributed
Properties set forth therein.

                  "Available Cash" means unrestricted cash and cash equivalents
of the Company less reasonable cash reserves, including, without limitation,
those necessary for working capital and obligations or other contingencies of
the Company. Available Cash shall not include any Initial Capital Contributions
except to the extent that all of the Members agree that the applicable portion
of any such Initial Capital Contribution is no longer needed to finance the
construction of the Manta Ray Initial Facilities and the Nautilus Initial
Facilities.

                  "Bankrupt Member" means any Member:

                  (a) that (i) makes a general assignment for the benefit of
creditors; (ii) files a voluntary bankruptcy petition; (iii) becomes the subject
of an order for relief or is declared insolvent in any federal or state
bankruptcy or insolvency proceeding; (iv) files a petition or answer seeking for
the Member a reorganization, arrangement, composition, readjustment,
liquidation, dissolution, or similar relief under any law; (v) files an answer
or other pleading admitting or failing to contest the material allegations of a
petition filed against the Member in a proceeding of the type described in
subclauses (i) through (iv) of this clause (a); or (vi) seeks, consents, or
acquiesces to the appointment of a trustee, receiver, or liquidator of the
Member or of all or any substantial part of the Member's properties; or

                  (b) against which a proceeding seeking reorganization,
arrangement, composition, readjustment, liquidation, dissolution, or similar
relief under any law has been commenced and 90 days have expired without
dismissal thereof or with respect to which, without the Member's consent or
acquiescence, a trustee, receiver, or liquidator of the Member or of all or any
substantial part of the Member's properties has been appointed and 60 days have
expired without such appointments having been vacated or stayed, or 60 days have
expired after the date of expiration of a stay, if the appointment has not
previously been vacated.

                  "Base Capacity" means the maximum throughput capacity on the
Manta Ray System or the Nautilus System, as applicable, immediately before the
commencement of the relevant Major Expansion Project and any additional capacity
thereafter created by any succeeding Major Expansion Project approved by Members
holding at least the applicable Required Interest or, pursuant to Section 15.2,
for which payout has occurred.

                  "Book-Tax Disparity" means with respect to any item of
Contributed Property or Adjusted Property, as of the date of any determination,
the difference


                                       3
<PAGE>   8

between the Carrying Value of such Contributed Property or Adjusted Property and
the adjusted basis thereof for federal income tax purposes as of such date. A
Member's share of the Company's Book-Tax Disparities in all of its Contributed
Property and Adjusted Property will be reflected by the difference between such
Member's Capital Account balance as maintained pursuant to Section 4.5 and the
hypothetical balance of such Member's Capital Account computed as if it had been
maintained strictly in accordance with federal income tax accounting principles.
The determination of Book-Tax disparity and a Member's share thereof shall be
determined consistently with section 1.704-3(c) of the Treasury Regulations.

                  "Boxer Line" means a 12 inch pipeline owned by Shell Holding
or its Affiliate running approximately eight miles from Green Canyon Block 65 to
Green Canyon Block 19, and all related facilities, including, but not limited
to, platform risers.

                  "Boxer Line Special Condition" means any condition, occurrence
or event which is (i) caused by the gross negligence or willful misconduct of
the Company, Ocean Breeze, Manta Ray or any Persons selected to operate the
Boxer Line or (ii) covered by Manta Ray's insurance.

                  "Boxer Line Stub Period Income" means, with respect to the
period beginning on the date hereof and ending on the Reconciliation Date, all
Boxer Line Stub Period Revenues less all Boxer Line Stub Period Expenses.

                  "Boxer Line Stub Period Revenues" means, with respect to the
period beginning on the date hereof and ending on the Reconciliation Date and
without duplication, 100% of all operating revenues, gains and income from all
operations attributable to the Boxer Line to the extent derived from any
contract, agreement or similar arrangement in existence prior to the Formation
Date.

                  "Boxer Line Stub Period Expenses" means, with respect to the
period beginning on the date hereof and ending on the Reconciliation Date and
without duplication, 100% of all cash operating expenses (including, without
limitation, the cost of insurance), non-cash expenses, such as depreciation and
amortization and the cost of repairs (including Shell Major Repairs) from all
operations attributable to the Boxer Line except to the extent attributable to a
Boxer Line Special Condition.

                  "Business Day" means Monday through Friday of each week,
except that a legal holiday recognized as such by the government of the United
States or the State of Texas shall not be regarded as a Business Day.

                  "Capacity Request" has the meaning given that term in Section
15.2.

                  "Capital Account" means the capital account maintained for
each Member pursuant to Section 4.5 herein.


                                       4
<PAGE>   9


                  "Capital Contribution" means any contribution by a Member to
the capital of the Company, as contemplated by Section 4.5(a).

                  "Carrying Value" means (a) with respect to Contributed
Property, the Asset Value of such property reduced (but not below zero) by all
depreciation, amortization and cost recovery deductions relating to such
property charged to the Members' Capital Accounts, and (b) with respect to any
other Company property, the adjusted basis of such property for federal income
tax purposes, all as of the time of determination. The Carrying Value of any
property shall be adjusted from time to time in accordance with Sections
4.5(d)(i), (d)(ii), and (d)(iii) and to reflect changes, additions or other
adjustments to the Carrying Value for dispositions and acquisitions of Company
properties, as deemed appropriate by the Company.

                  "Certificate" has the meaning given that term in Section 2.1.

                  "Code" means the Internal Revenue Code of 1986 and any
successor statute, as amended from time to time.

                  "Company" means Neptune Pipeline Company, L.L.C., a Delaware
limited liability company.

                  "Company Minimum Gain" means the amount determined pursuant to
Treasury Regulation section 1.704-2(d).

                  "Construction Agreements" means (i) the Construction
Management Agreement between Shell Holding and Manta Ray, (ii) the Construction
Management Agreement between Marathon Holding and Manta Ray, and (iii) the
Construction Management Agreement between Marathon Holding, and Nautilus.

                  "Construction Certificate" has the meaning given that term in
Section 3.17.

                  "Contribution Agreement" means each Contribution Agreement of
even date herewith between the Company, on the one hand, and the Members or
their Affiliates, on the other hand.

                  "Contributed Property" means each property or other asset, in
such form as may be permitted by the Act, but excluding cash or cash
equivalents, contributed to the Company (or deemed contributed to the Company on
termination and reconstitution thereof pursuant to section 708 of the Code).
Once the Carrying Value of a Contributed Property is adjusted pursuant to
Section 4.5(d), such property shall no longer constitute a Contributed Property
for purposes of Section 5.2, but shall be deemed an Adjusted Property for such
purposes.

                  "Costs" has the meaning given that term in Section
4.3(a)(ii)(3).

                  "CPR Institute" has the meaning given that term in Section
3.6(e).


                                       5
<PAGE>   10

                  "Dedication Agreements" means, collectively, (a) the Gas
Gathering Agreements between (i) Shell Offshore Inc., Shell Deepwater
Development Inc., and Shell Deepwater Production Inc., and Manta Ray and (ii)
Marathon Oil Company and Manta Ray, (b) the Precedent Agreements relating to the
Dedicated Leases, each dated as of even date herewith, between (i) Shell
Offshore Inc., Shell Deepwater Development Inc., and Shell Deepwater Production
Inc. and Nautilus, (ii) Marathon Oil Company and Nautilus, (c) the Service
Agreements for Firm Transportation Service Under Rate Schedule FT-2 related to
the Precedent Agreements described in (b) above, and (d) the Reserve Dedication
and Discount Rate Agreements, each dated as of even date herewith, between (i)
Shell Offshore Inc., Shell Deepwater Development Inc., Shell Deepwater
Production Inc. and Nautilus and (ii) Marathon Oil Company and Nautilus , each
individually a "Dedication Agreement."

                  "Dedicated Leases" means all oil, gas and mineral leases
certain of the production from which is dedicated pursuant to any Dedication
Agreement.

                  "Default" means, in respect of any Member, upon the occurrence
and during the continuation of any of the following events:

                  (a) the failure to remedy, within seven Business Days of such
Member's receipt of written notice thereof from the Company or any other Member,
a Member's delinquency in making any Capital Contribution to the Company as
required pursuant to Section 4.1 or 4.2;

                  (b) the occurrence of any event that causes such Member to
become a Bankrupt Member; or

                  (c) the failure to remedy, within ten Business Days of receipt
of written notice thereof from the Company or any other Member, the
non-performance of or non-compliance with any other material agreements,
obligations or undertakings of such Member contained in this Agreement or of
such Member or any of its Affiliates contained in any Contribution Agreement if
such non-performance or non-compliance with such Contribution Agreement could
reasonably be expected to result in Losses to the Company of at least
$1,000,000, in the aggregate.

                  "Default Interest Rate" means a rate per annum, compounded
monthly equal to the lesser of (a) 4% plus the one year LIBOR rate quoted in the
Wall Street Journal (or, in its absence, a similar publication) on the first day
of the applicable month and (b) the maximum rate permitted by applicable laws.

                  "Delinquent Member" has the meaning given that term in Section
4.3(a).

                  "Dispute" has the meaning given that term in Section 16.21.

                  "Disputing Party" has the meaning given that term in Section
16.21.


                                       6
<PAGE>   11

                  "Economic Risk of Loss" has the meaning set forth in Treasury
Regulation section 1.752-2(a).

                  "Eligible Citizen" means a Person qualified to hold leases,
rights-of-way, permits, licenses or other similar agreements or documents issued
by or entered into with the United States government, and whose status as a
Member or Transferee does not or would not subject the Company to a substantial
risk of cancellation or forfeiture of any such lease, right-of-way, permit,
license or other similar agreement or document issued by or entered into with
the United States government. As of the date hereof, "Eligible Citizen" means
(a) a citizen of the United States, (b) an association (including a partnership,
joint tenancy in common) organized or existing under the Laws of the United
States or any state or territory thereof, all of the members of which are
citizens of the United States, (c) a corporation organized under the Laws of the
United States or of any state or territory thereof, or (d) a limited liability
company organized under the Laws of the United States or any state or territory
thereof, not more than five percent of the voting stock, or of all the stock, of
which corporation, to the best of its knowledge, is owned or controlled by
citizens of countries that deny to United States citizens privileges to own
stock in corporations holding oil and gas leases similar to the privileges of
non-United States citizens to own stock in corporations holding an interest in
oil and gas leases on federal lands.

                  "Exercising Member" has the meaning given that term in Section
15.2.

                  "Expanded Capacity" means, with respect to a relevant Major
Expansion Project, the additional throughput capacity created on the Manta Ray
System or the Nautilus System, as applicable, as a result of such relevant Major
Expansion Project built pursuant to Section 15.2.

                  "Expanded Capacity Revenues" means revenues from gathering
services, if such expansion relates to the Manta Ray System, or from
transportation services, if such expansion relates to the Nautilus System, and
from any other services provided by the relevant Subsidiary of the Company
attributable to the Expanded Capacity Volumes.

                  "Expanded Capacity Volumes" means, for the relevant month, the
lesser of (i) the Expanded Capacity or (ii) the sum of Expansion Property
Production and Incremental Volumes.

                  "Expansion Liquidation Value" has the meaning given that term
in Section 12.2(c).

                  "Expansion Option" has the meaning given that term in Section
15.2.

                  "Expansion Option Notice" has the meaning given that term in
Section 15.2.


                                       7
<PAGE>   12


                  "Expansion Option Period" has the meaning given that term in
Section 15.2.

                  "Expansion Property" has the meaning given that term in
Section 15.2.

                  "Expansion Property Production" has the meaning given that
term in Section 15.2.

                  "FERC" means the Federal Energy Regulatory Commission or any
successor or replacement Person.

                  "FERC Certificate" means the initial Certificate of Public
Convenience and Necessity authorizing Nautilus to provide transportation
services on the Nautilus System and approving the initial rates, terms and
conditions of service.

                  "Foreclosure Transfer" means any Transfer resulting from any
judicial or non-judicial foreclosure by the holder of a Security Interest or any
Transfer to the holder of a Security Interest in connection with a workout or
similar arrangement or any transfer from the holder of a Security Interest.

                  "Formation Date" has the meaning given that term in the
preamble.

                  "GAAP" means generally accepted accounting principles,
consistently applied.

                  "Gas Contract" means any contract, agreement or other
obligation of any of the Company, Manta Ray or Nautilus to purchase fuel gas,
buy or sell linepack gas or transport, exchange, gather, process or otherwise
handle natural gas.

                  "General Interest Rate" means a rate per annum, compounded
monthly, equal to the lesser of (a) the sum of the one year LIBOR rate quoted in
the Wall Street Journal (or, in its absence, a similar publication) on the first
day of the applicable month, plus one percent and (b) the maximum rate permitted
by applicable laws.

                  "Incremental Volumes" means, with respect to a relevant month,
the aggregate volumes gathered or transported by the Manta Ray System or the
Nautilus System, as applicable, in excess of the Base Capacity, plus the
relevant Expansion Property Production; provided, however, that the Incremental
Volumes shall be applied to Major Expansion Projects which have not paid out
pursuant to Section 15.2 in chronological order of completion.

                  "Initial Capital Contribution" has the meaning given that term
in Section 4.1 herein.

                  "Lateral" means any newly constructed natural gas pipeline,
lateral, segment or extension that directly connects or is proposed to directly
connect to the


                                       8
<PAGE>   13

Company's (or any of its Subsidiaries') then existing natural gas pipelines,
laterals, segments or extensions.

                  "Lateral Connection Point" means, (i) with respect to any
proposed natural gas pipeline, lateral, segment or extension that is proposed to
connect one or more wells to the Company's (or its Subsidiary's) existing
pipelines, laterals, segments or extensions, the closest and most practical
connection point or points, taking into account the location of the relevant
well or wells and the Company's (or its Subsidiaries') existing pipelines,
laterals or segments, where sufficient capacity for gas to be produced from
wells connected to such proposed pipeline, lateral or segment is available (or
could be made available by acquiring, constructing or otherwise obtaining
additional facilities in accordance with the terms of Section 7.2 or Section
15.2) or (ii) any other mutually agreeable interconnection point.

                  "Lateral Opportunity" has the meaning given that term in
Section 15.1.

                  "Lateral Opportunity Notice" has the meaning given that term
in Section 15.1.

                  "Laws" means the laws, rules, regulations, decrees and orders
of the United States of America and all other governmental authorities having
jurisdiction, whether such Laws now exist or hereafter come into effect.

                  "Leviathan Gas Pipeline Companies" means Leviathan Gas
Pipeline Partners, L.P. and any direct or indirect Subsidiary thereof.

                  "Leviathan Holding" means Sailfish Pipeline Company, L.L.C.

                  "Leviathan Major Repairs" means all repairs resulting from
Losses to the Manta Ray Phase I Facilities prior to the Reconciliation Date,
except to the extent such Losses result from or constitute a Manta Ray Special
Condition.

                  "Leviathan Reconciliation Date Income" has the meaning given
that term in Section 4.5(c)(iii).

                  "Lending Member" has the meaning given that term in Section
4.3(a)(ii).

                  "Liquidator" has the meaning given that term in Section 12.2.

                  "Loss" or "Losses" means, subject to the limitations set forth
in Section 16.20, any actions, claims, settlements, judgments, demands, liens,
losses, damages, fines, penalties, interest, costs, expenses (including, without
limitation, expenses attributable to the defense of any actions or claims),
attorneys' fees and liabilities.

                  "Major Expansion Project" means, other than a Lateral which
connects at a Lateral Connection Point, any physical enhancement or series of
physical enhancements which would increase the Base Capacity of any then
existing pipeline,


                                       9
<PAGE>   14

lateral, segment, extension or other significant natural gas handling facility
owned, leased or otherwise controlled by the Company, Nautilus or Manta Ray,
including, without limitation, adding compression to one or more existing
pipelines, laterals, segments or extensions or constructing a new pipeline,
lateral, segment or extension (which does not constitute a Lateral which
connects at a Lateral Connection Point).

                  "Majority Interest" means, subject to and in accordance with
Section 7.5, any Member (together with its Affiliated Members) and at least one
other non-Affiliated Member having among them more than 50% of the Membership
Interests of all Members; provided, however, any single Member (together with
its Affiliated Members) shall constitute a "Majority Interest" only if such
Member (together with its Affiliated Members) owns at least 76% of the
Membership Interest of all of the Members.

                  "Manta Ray" means Manta Ray Offshore Gathering Company, L.L.C.

                  "Manta Ray Initial Facilities" means the Manta Ray Phase I
Facilities, the Manta Ray Phase II Facilities and the Boxer Line.

                  "Manta Ray Phase I Facilities" means those assets, other than
cash, contributed as of even date herewith by Poseidon Pipeline Company, L.L.C.
and Manta Ray Gathering Company, L.L.C., as more particularly described in part
I.A. of "Exhibit B."

                  "Manta Ray Phase II Facilities" means the natural gas
pipelines and related facilities described in Part I.B. of Exhibit B and to be
constructed pursuant to that certain Construction Agreement dated as of even
date herewith between Manta Ray and Shell Holding and the Construction Agreement
between Marathon Holding and Manta Ray.

                  "Manta Ray Special Condition" means any condition, occurrence
or event which is (i) caused by the gross negligence or willful misconduct of
the Company, Ocean Breeze, Manta Ray or any Person selected to operate the Manta
Ray Phase I Facilities or (ii) covered by Manta Ray's insurance.

                  "Manta Ray Stub Period Income" means, with respect to the
period beginning on the date hereof and ending on the Reconciliation Date, all
Manta Ray Stub Period Revenues less all Manta Ray Stub Period Expenses.

                  "Manta Ray Stub Period Revenues" means, with respect to the
period beginning on the date hereof and ending on the Reconciliation Date and
without duplication, 100% of all operating revenues, gains and income from all
operations attributable to the Manta Ray Phase I Facilities except to the extent
related to New Business.

                  "Manta Ray Stub Period Expenses" means, with respect to the
period beginning on the date hereof and ending on the Reconciliation Date and
without


                                       10
<PAGE>   15

duplication, 100% of all cash operating expenses (including, without limitation,
the cost of insurance), non-cash expenses, such as depreciation and amortization
and the cost of repairs (including Leviathan Major Repairs) from all operations
attributable to the Manta Ray Phase I Facilities except to the extent
attributable to (i) New Business or (ii) a Manta Ray Special Condition.

                  "Manta Ray System" means the Manta Ray Initial Facilities and
any other natural gas pipelines and related facilities constructed, purchased or
otherwise acquired by Manta Ray in accordance with the terms and conditions of
this Agreement and Manta Ray's Limited Liability Company Agreement.

                  "Marathon Gas Pipeline Companies" means (i) Marathon Pipe Line
Company, (ii) Marathon Holding and (ii) any direct or indirect Subsidiaries of
(i) and (ii).

                  "Marathon Holding" means Marathon Gas Transmission Inc.

                  "Member" means any Person executing this Agreement as of even
date herewith as a Member or any Person hereafter admitted to the Company as an
additional Member or Substituted Member as provided in this Agreement, but does
not include any Person who has ceased to be a Member in the Company.

                  "Membership Interest" means, subject to and in accordance with
Section 7.5, the ownership interest (on a percentage basis) of a Member in the
Company, including, without limitation, rights to distributions (liquidating or
otherwise), allocations, information, and to consent or approve, which ownership
interest is more particularly described and identified in Article III and
Exhibit A.

                  "Minimum Gain Attributable to Member Nonrecourse Debt" means
that amount determined in accordance with the principles of Treasury Regulation
section 1.704 2(i)(3).

                  "NGA" means the Natural Gas Act of 1938, as amended from time
to time.

                  "Nautilus" means Nautilus Pipeline Company, L.L.C.

                  "Nautilus Initial Facilities" means the natural gas pipelines
and related facilities as more particularly described in Part II of Exhibit B
and to be constructed pursuant to that certain Construction Agreement dated as
of even date herewith between Nautilus and Marathon Holding.

                  "Nautilus System" means the Nautilus Initial Facilities, and
any other natural gas pipelines and related facilities constructed, purchased or
otherwise acquired by Nautilus in accordance with the terms and conditions of
this Agreement and Nautilus' Limited Liability Company Agreement.


                                       11
<PAGE>   16

                  "Net Asset Value" means (a) in the case of any Contributed
Property, the fair market value of such property reduced by any liabilities
either assumed by the Company upon such contribution or to which such property
is subject when contributed; provided, however, the fair market value of the
Contributed Property described on Exhibit A shall be deemed to be the Asset
Value of such Contributed Property set forth therein, and (b) in the case of any
property distributed to a Member or Transferee by the Company, the Company's
Carrying Value of such property at the time such property is distributed,
reduced by any indebtedness either assumed by such Member or Transferee upon
such distribution or to which such property is subject at the time of
distribution as determined under section 752 of the Code.

                  "Net Income" means, for any taxable period, the excess, if
any, of the Company's items of income and gain for such taxable period over the
Company's items of loss and deduction for such taxable period. The items
included in the calculation of Net Income shall be determined in accordance with
Section 4.5(b) and shall not include any items specifically allocated under
Sections 5.1(c) through 5.1(j). For purposes of Sections 5.1(a) and (b), in
determining whether Net Income has been allocated to any Member for any previous
taxable period, any Unrealized Gain or Unrealized Loss allocated pursuant to
Section 4.5(d)(i), (d)(ii) and (d)(iii) shall be treated as an item of gain or
loss in computing Net Income.

                  "Net Loss" means, for any taxable period, the excess, if any,
of the Company's items of loss and deduction for such taxable period over the
Company's items of income and gain for such taxable period. The items included
in the calculation of Net Loss shall be determined in accordance with Section
4.5(b) and shall not include any items specifically allocated under Sections
5.1(c) through 5.1(j). For purposes of Sections 5.1(a) and (b), in determining
whether Net Loss has been allocated to any Member for any previous taxable
period, any Unrealized Gain or Unrealized Loss allocated pursuant to Section
4.5(d)(i), (d)(ii) and (d)(iii) shall be treated as an item of gain or loss in
computing Net Loss.

                  "New Business" means, without duplication, (a) all revenues,
expenses, repair costs and net cash flows resulting from gas volumes produced
from the Dedicated Leases that flow on the Manta Ray Phase I Facilities pursuant
to the Dedication Agreements, (b) all revenues, expenses, repair costs and net
cash flows resulting from gas volumes flowing into the Manta Ray Phase II
Facilities and then into the Manta Ray Phase I Facilities, (c) all revenues,
expenses, repair costs and net cash flows resulting from gas volumes flowing
solely on the Manta Ray Phase II Facilities and/or the Nautilus System, but not
flowing on the Manta Ray Phase I Facilities, and (d) all revenues, expenses,
repair costs and net cash flows relating to gas processing contracts or any
operations other than gathering or transporting natural gas.

                  "Non-Cash Consideration" has the meaning given that term in
Section 3.6(e) herein.


                                       12
<PAGE>   17

                  "Nonrecourse Built-in Gain" means with respect to any
Contributed Properties or Adjusted Properties that are subject to a mortgage or
negative pledge securing a Nonrecourse Liability, the amount of any taxable gain
that would be allocated to the Members pursuant to Section 5.2(b)(i)(A),
5.2(b)(ii)(A) or 5.2(b)(iii) if such properties were disposed of in a taxable
transaction in full satisfaction of such liabilities and for no other
consideration.

                  "Nonrecourse Debt" has the meaning set forth in Treasury
Regulation section 1.704-2(b)(4).

                  "Nonrecourse Deductions" means any and all items of loss,
deduction, or expenditure (described in section 705(a)(2)(B) of the Code) that,
in accordance with the principles of Treasury Regulation section 1.704-2(b)(1),
are attributable to a Nonrecourse Liability.

                  "Nonrecourse Liability" has the meaning assigned to such term
in Treasury Regulation section 1.704-2(b)(3).

                  "Non-Transferring Members" has the meaning given that term in
Section 3.6(e) herein.

                  "Obligation" has the meaning given that term in Section
4.3(a)(ii)(2).

                  "Ocean Breeze" means Ocean Breeze Pipeline Company, L.L.C.

                  "Offer Notice" has the meaning given that term in Section
3.6(e).

                  "Operating Agreements" means collectively the Operating
Agreement between Shell Holding and Manta Ray, the Operating Agreement between
Manta Ray Gathering Company, L.L.C. and Manta Ray, the Operating Agreement
between Marathon Holding and Manta Ray, the Operating Agreement between Marathon
Holding and Nautilus, and the Operating Agreement between Shell Holding and
Nautilus, and the Operating Agreement between the Company and Shell Holding.

                  "Option Period" has the meaning given that term in Section
3.6(e) herein.

                  "Payout Amount" means an amount of money equal to 150% of the
amount of the actual out-of-pocket capital cost of the relevant Major Expansion
Project; provided, however that to the extent the Company, Ocean Breeze,
Nautilus or Manta Ray, as applicable, elects to prepay all or any portion of the
unamortized portion of the principal amount of the Payout Balance in accordance
with Section 15.2, such Payout Amount shall be reduced as described in Section
15.2(c).

                  "Person" means any individual or entity, including, without
limitation, any corporation, limited liability company, partnership (general or
limited), joint


                                       13
<PAGE>   18

venture, association, joint stock company, trust, unincorporated organization or
government (including any board, agency, political subdivision or other body
thereof).

                  "Proceeding" has the meaning given that term in Section 8.1.

                  "PUHCA" means the Public Utility Holding Company Act of 1935,
as amended, and the rules and regulations promulgated thereunder.

                  "Recapture Income" means any gain recognized by the Company
(computed without regard to any adjustment required by section 734 or 743 of the
Code) upon the disposition of any property or asset of the Company, which gain
is characterized as ordinary income because it represents the recapture of
deductions previously taken with respect to such property or asset.

                  "Reconciliation Adjustment" means, with respect to each
relevant Capital Contribution, an additional amount to be credited to the
contributing Member's Capital Account as of the Reconciliation Date in an amount
equal to a carrying charge on such Capital Contribution calculated from the
first day of the calendar month in which the Company actually spends the
contributed capital to the Reconciliation Date at a rate per annum, compounded
monthly, equal to 8.28%.

                  "Reconciliation Date" means the first day of the calendar
month immediately following the calendar month in which any of the following
events first occurs: (i) production from the Troika Field (Green Canyon Blocks
244 et al.) first flows on the Manta Ray System and the Nautilus System, (ii)
the Nautilus System and Manta Ray System are each transporting from the
Dedicated Leases an average of at least 140,000,000 cubic feet of natural gas
per day pursuant to the Dedication Agreements during any consecutive 60 day
period or (iii) December 1, 1999.

                  "Record Date" means the date established by the Company for
determining (a) the identity of Members (or Transferees, if applicable) entitled
to notice of, or to vote at, any meeting of Members or entitled to vote by
ballot or give approval of Company action in writing without a meeting or
entitled to exercise rights in respect of any lawful action of Members or (b)
the identity of Record Holders entitled to receive any report or distribution.

                  "Record Holder" means the Person in whose name a Membership
Interest is registered on the books of the Company as of the opening of business
on a particular Business Day.

                  "Rejected Lateral Opportunity" has the meaning given that term
in Section 15.1.

                  "Relevant Area" means the Eugene Island, Rabbit Island, Ship
Shoal, South Timbalier, Grand Isle, Ewing Bank, Green Canyon areas of the Gulf
of Mexico, offshore state waters adjacent to St. Mary Parish, Louisiana and
onshore St. Mary Parish, Louisiana from the coast to Garden City and such other
offshore areas of the


                                       14
<PAGE>   19

Gulf of Mexico or onshore area into which the Nautilus System or Manta Ray
System expands.

                  "Required Interest" means, subject to and in accordance with
Section 7.5, the applicable percentage of Membership Interests of all Members
required to authorize or approve a relevant act of the Company, including,
without limitation, a Majority Interest, a Super-Majority Interest or all
Membership Interests, as applicable.

                  "Residual Gain" or "Residual Loss" means any item of gain or
loss, as the case may be, of the Company recognized for federal income tax
purposes resulting from a sale, exchange or other disposition of a Contributed
Property or Adjusted Property, to the extent such item of gain or loss is not
allocated pursuant to Section 5.2(b)(i)(A) or 5.2(b)(ii)(A), to eliminate Book
Tax Disparities.

                  "Security Interest" means any security interest, lien,
mortgage, encumbrance, hypothecation, pledge, or other obligation, whether
created by operation of law or otherwise, created by any Person in any of its
property or rights as part of a bona fide arms-length securitization
transaction.

                  "Service" means the Internal Revenue Service.

                  "Shell Gas Pipeline Companies" means (i) Shell Gas Pipeline
Company, (ii) Shell Holding and (iii) any direct or indirect Subsidiary of
either (i) or (ii).

                  "Shell Holding" means Shell Seahorse Company.

                  "Shell Major Repairs" means all repairs resulting from Losses
to the Boxer Line prior to the Reconciliation Date, except to the extent such
Losses result from or constitute a Boxer Line Special Condition.

                  "Shell Reconciliation Date Income" has the meaning given that
term in Section 4.5(c)(iii).

                  "Subject Interest" has the meaning given that term in
Section 3.6(e).

                  "Subsidiary" means, with respect to any relevant Person, any
other Person that is controlled (directly or indirectly) and more than 50%-owned
(directly or indirectly) by the relevant Person. For purposes of this
definition, the term control means the ability to direct the management or
policies of such Person by ownership of voting interest, contract or otherwise.

                  "Substituted Member" means a Person who is admitted as a
Member of the Company at such time as such Person has complied with the
requirements of Section 3.5, in place of and with all the rights of a Transferor
and who is shown as a Member on the books and records of the Company.


                                       15
<PAGE>   20

                  "Super-Majority Interest" means, subject to and in accordance
with Section 7.5, any Member (together with its Affiliated Members) and at least
one other non-Affiliated Member having among them more than 74% of the
Membership Interests of all Members.

                  "Tax Matters Member" has the meaning given that term in
Section 9.3.

                  "Termination Right" has the meaning given that term in Section
3.17.

                  "Termination Time" has the meaning given that term in Section
3.17.

                  "Transfer" or "Transferred" means, other than granting a
Security Interest, (i) a voluntary or involuntary sale, assignment, transfer,
conveyance, exchange, bequest, devise, gift or any other alienation (in each
case, with or without consideration) of any rights, interests or obligations
with respect to all or any portion of any Membership Interest including, without
limitation, a Foreclosure Transfer, or (ii) (A) the sale of all or substantially
all of a Member's assets to a Person that is not an Affiliate of such Member
prior to such sale, (B) a merger or consolidation involving a Member and a
Person that is not an Affiliate of such Member prior to such merger or
consolidation, or (C) a transfer, directly or indirectly, in one or more
transactions, of a majority of the equity interests in a Member to a Person that
is not an Affiliate of such Member prior to such transfer; provided, however,
that a transfer, directly or indirectly, of the equity ownership (including,
without limitation, a merger, consolidation, share exchange or similar
transaction) or of all or substantially all of the assets of the direct or
indirect parent of any Member shall not be considered a Transfer hereunder.

                  "Transferee" means a Person who receives all or part of a
Member's Membership Interest through a Transfer but who has not become a
Substituted Member.

                  "Transferor" means a Member, Substituted Member or a
predecessor Transferor who Transfers a Membership Interest.

                  "Transferring Member" has the meaning given that term in
Section 3.6(e) herein.


                                       16
<PAGE>   21

                  "Treasury Regulation" shall have the meaning set forth in
Section 3.9.

                  "Unrealized Gain" attributable to any item of Company property
means, as of any date of determination, the excess, if any, of (a) the fair
market value of such property as of such date over (b) the Carrying Value of
such property as of such date (prior to any adjustment to be made pursuant to
Section 4.5(d) as of such date). In determining such Unrealized Gain, the
aggregate cash amount and fair market value of a Company asset (including cash
or cash equivalents) shall be determined by the Company using such reasonable
method of valuation as it may adopt.

                  "Unrealized Loss" attributable to any item of Company property
means, as of any date of determination, the excess, if any, of (a) the Carrying
Value of such property as of such date (prior to any adjustment to be made
pursuant to Section 4.5(d) as of such date) over (b) the fair market value of
such property as of such date. In determining such Unrealized Loss, the
aggregate cash amount and fair market value of a Company asset (including cash
or cash equivalents) shall be determined by the Company using such reasonable
method of valuation as it may adopt.

                  "Voting Stock" means capital stock issued by a corporation, or
equivalent interests in any other Person, the holders of which are ordinarily,
in the absence of contingencies, entitled to vote for the election of directors
(or Persons with management authority performing similar functions) of such
Person.

                  "Withdrawing Member" shall have the meaning given that term in
Section 12.2(d).

         1.2 OTHER TERMS. Other terms may be defined elsewhere in the text of
this Agreement and shall have the meaning so given. Whenever the context
requires, the singular shall include the plural, and the plural, shall include
the singular.

         1.3 CONSTRUCTION. Whenever the context requires, the gender of all
words used in this Agreement includes the masculine, feminine, and neuter. All
references to Articles and Sections refer to articles and sections of this
Agreement, and all references to Exhibits are to exhibits attached hereto, each
of which is incorporated herein for all purposes. Articles and other titles or
headings are for convenience only and neither limit nor amplify the provisions
of the Agreement itself, and all references herein to articles, sections or
subdivisions thereof shall refer to the corresponding article, section or
subdivision thereof of this Agreement unless specific reference is made to such
articles, sections or subdivisions of another document or instrument.


                                       17
<PAGE>   22


                                  ARTICLE II.

                                  ORGANIZATION

         2.1 FORMATION. The Company has been organized as a Delaware limited
liability Company by the filing of a Certificate of Formation (the
"Certificate") with the Secretary of State of the State of Delaware pursuant to
the Act.

         2.2 NAME. The name of the Company is Neptune Pipeline Company, L.L.C.
and all Company business must be conducted in that name or such other names that
comply with applicable law as the Company may select from time to time.

         2.3 PRINCIPAL OFFICE IN THE UNITED STATES; OTHER OFFICES. The principal
office of the Company in the United States shall be at 200 N. Dairy Ashford,
Houston, Texas 77079, or at such other place as the Company may designate from
time to time, which need not be in the State of Delaware. The Company may have
such other offices as the Members may designate from time to time.

         2.4 PURPOSE. The sole purpose of the Company is to own interests in
Manta Ray and Nautilus, which shall acquire, construct, own and operate the
Manta Ray System and the Nautilus System, respectively. Except for activities
related to such purposes, there are no other authorized business purposes of the
Company. The Company shall not engage in any activity or conduct inconsistent
with such purposes, including, without limitation, entering into any hedging,
futures, derivatives or similar transaction.

         2.5 FOREIGN QUALIFICATION. Prior to the Company's conducting business
in any jurisdiction other than Delaware, the Company shall comply, to the extent
procedures are available and those matters are reasonably within the control of
the Company, with all requirements necessary to qualify the Company as a foreign
limited liability company, and, if necessary, keep the Company in good standing,
in that jurisdiction.

         2.6 TERM. Subject to earlier termination pursuant to other provisions
of this Agreement (including those contained in Article XII), the term of the
Company shall be from the date of this Agreement through and including December
31, 2046.

         2.7 MERGERS AND EXCHANGES. Except as otherwise provided in this
Agreement or by applicable Laws, the Company may be a party to any (i) merger,
(ii) consolidation, (iii) exchange or acquisition or (iv) any other type of
reorganization.

         2.8 BUSINESS OPPORTUNITIES--NO IMPLIED DUTY OR OBLIGATION. Except to
the extent expressly provided in this Section 2.8 or Article XV, the Members and
their respective Affiliates may engage, directly or indirectly, without the
consent of the other Members or the Company, in other business opportunities,
transactions, ventures or other arrangements of any nature or description,
independently or with others, including


                                       18
<PAGE>   23

without limitation, business of a nature which may be competitive with or the
same as or similar to the business of the Company, regardless of the geographic
location of such business, and without any duty or obligation to account to the
other Members or the Company in connection therewith; provided, however, that
each Member (or any Affiliate thereof) shall jointly solicit on behalf of, and
offer to, Manta Ray any opportunity to acquire or otherwise obtain the gas
processing rights of Persons who are not Members (or Affiliates of Members) with
respect to the gas shipped by such Person on the Nautilus System for delivery to
the Garden City Gas Plant for processing, if capacity exists or can be obtained
under the Processing Agreement, before such Member (or applicable Affiliate)
shall be entitled to acquire or otherwise obtain such gas processing rights and
no Member (or any Affiliate thereof) shall compete with Manta Ray or otherwise
participate in processing arrangements with respect to such gas; provided,
however, that if any Member or any Affiliate thereof has purchased the Garden
City Gas Plant and subsequently expands such plant's capacity in excess of that
contemplated by the processing agreement, any obligation of such Member
(including its Affiliates created by this Section 2.8 shall be waived and
extinguished to the extent such obligation relates to capacity created by such
expansion; and provided, further, that if any Member or any Affiliates thereof
have acquired interests which sum to less than 100% of the interests in the
Garden City Gas Plant, any obligation of such Members (including their
Affiliates) created by this Section 2.8 shall be waived and extinguished to the
extent inconsistent with the duties and obligations of such Members (including
their Affiliates) to the other interest owners in the Garden City Gas Plant.
Nothing herein is intended to create a partnership, joint venture, agency or
other relationship creating fiduciary or quasi-fiduciary duties or similar
duties and obligations or subject the Members to joint and several or vicarious
liability or to impose any duty, obligation or liability that would arise
therefrom with respect to any or all of the Members of the Company.

                                  ARTICLE III.
                       MEMBERSHIP INTERESTS AND TRANSFERS

         3.1 INITIAL MEMBERS. The initial Members of the Company are the Persons
executing this Agreement as of the date hereof in such capacity, each of which
is admitted to the Company as a Member effective contemporaneously with the
execution by such Person of this Agreement.

         3.2 NUMBER OF MEMBERS. The number of Members of the Company shall never
be fewer than two.

         3.3 MEMBERSHIP INTERESTS. The Members agree that each Member's
ownership in the Company shall be that which is set forth in Exhibit A, as
amended from time to time in accordance with the terms of this Agreement.


                                       19

<PAGE>   24

         3.4 REPRESENTATIONS AND WARRANTIES. Each Member hereby represents and
warrants to the Company and each other Member that (a) it is duly formed,
validly existing and (if applicable) in good standing under the Laws of the
state of its formation, and if required by Laws is duly qualified to do business
and (if applicable) is in good standing in the jurisdiction of its principal
place of business (if not formed therein); (b) that Member has full corporate,
limited liability company, partnership, trust, or other applicable power and
authority to execute and agree to this Agreement and to perform its obligations
hereunder and all necessary actions by the board of directors, shareholders,
managers, members, partners, trustees, beneficiaries, or other Persons necessary
for the due authorization, execution, delivery, and performance of this
Agreement by that Member have been duly taken; (c) that Member has duly executed
and delivered this Agreement and it is enforceable against such Member in
accordance with its terms, subject to bankruptcy, moratorium, insolvency and
other Laws generally affecting creditors' rights and general principles of
equity (whether applied in a proceeding in a court of law or equity); (d) that
Member's authorization, execution, delivery, and performance of this Agreement
does not conflict with any material obligation under any other material
agreement or arrangement to which that Member is a party or by which it is
bound; (e) that Member is an Eligible Citizen and will remain an Eligible
Citizen for so long as such Member remains a Member of the Company; (f) neither
that Member nor any of its Affiliates or Subsidiaries nor any Person in which it
owns an equity interest is a "holding company," a "subsidiary company" of a
"holding company" or of a "subsidiary company" of a "holding company," or a
"public utility" as each of such terms is defined in PUHCA (unless such Member,
Affiliate, Subsidiary, or Person has received an exemption from registering
under the PUHCA), and the ownership of a Membership Interest by such Member does
not, and, for so long as such Member owns a Membership Interest, will not, cause
the Company, its Subsidiaries or the other Members to be subject to or adversely
affected by PUHCA (including any approval requirements arising under Section
9(a)(2) of PUHCA); and (g) it (i) has been furnished with or given adequate
access to such information about the Company and the Membership Interest as the
Member has requested, (ii) has made its own independent inquiry and
investigation into, and based thereon has formed an independent judgment
concerning, the Company and that Member's Membership Interest therein, (iii) has
adequate means of providing for its current needs and possible individual
contingencies and is able to bear the economic risks of this investment and has
a sufficient net worth to sustain a loss of its entire investment in the Company
in the event such loss should occur, (iv) has such knowledge and experience in
financial and business matters as to be capable of evaluating the merits and
risks of an investment in the Company, (v) is an "accredited investor" within
the meaning of "accredited investor" under Regulation D of the Securities Act of
1933, as amended, and (vi) understands and agrees that its Membership Interest
shall not be sold, pledged, hypothecated or otherwise transferred except in
accordance with the terms of this Agreement and pursuant to an applicable
exemption from registration under the Securities Act of 1933 and other
applicable securities Laws. Upon the occurrence and during the continuation of
any event or condition which would cause a Member to be in breach of a
representation or warranty


                                       20
<PAGE>   25

contained in Section 3.4(e) or (f), the breaching Person shall be treated as a
Transferee who has not become a Substituted Member in accordance with the terms
of Section 3.5(c).

         3.5 RESTRICTIONS ON THE TRANSFER OF A MEMBERSHIP INTEREST. A Member may
Transfer all or part of a Membership Interest only in accordance with applicable
Laws and the provisions of this Agreement, including the following provisions of
this Section. Any purported Transfer in breach of the terms of this Agreement
shall be null and void ab initio, and the Company shall not recognize any such
prohibited Transfer.

                  (a) A Membership Interest shall not be Transferred except
         pursuant to an applicable exemption from registration under the
         Securities Act of 1933 and other applicable securities Laws;

                  (b) Except as otherwise provided in this Agreement or by
         applicable Laws, a Transfer of a Membership Interest shall be effective
         only to give the Transferee the right to receive the share of
         allocations and distributions to which the Transferor would otherwise
         be entitled, and no Transferee of a Membership Interest shall have the
         right to become a Substituted Member;

                  (c) Unless and until a Transferee is admitted as a Substituted
         Member, (i) the Transferee shall have no right to exercise any of the
         powers, rights and privileges of a Member hereunder other than to
         receive its share of allocations and distributions pursuant to Section
         3.5 (b), and (ii) the Member who has Transferred all or any part of its
         Membership Interest to such Transferee shall cease to be a Member with
         respect to such Membership Interest upon Transfer of such Membership
         Interest and thereafter shall have no further powers, rights and
         privileges as a Member hereunder with respect to such Membership
         Interest (to the extent so Transferred), but shall, unless otherwise
         relieved of such obligations, remain liable for all obligations and
         duties as a Member with respect to such Membership Interest; provided,
         however, that if the Transferee reconveys such Membership Interest to
         the Transferor within ten days after the Transferor becomes aware that
         the Transferee will not become a Substituted Member, the Transferor
         shall once again be entitled to all of the powers, rights and
         privileges of a Member hereunder;

                  (d) Subject to compliance with the terms and conditions of
         Section 3.6, a Transferee may become a Substituted Member if the
         Transferee agrees in writing to be bound by all the terms and
         conditions, as then in effect, of this Agreement;

                  (e) At the time all of the provisions of Sections 3.5, 3.6 and
         3.7 are complied with, (i) a Substituted Member shall have all of the
         powers, rights, privileges, duties, obligations and liabilities of a
         Member, as provided in this Agreement and by applicable Laws to the
         extent of the Membership Interest so Transferred and (ii) the Member
         who Transferred the Membership Interest shall


                                       21
<PAGE>   26

         be relieved of all of the obligations and liabilities with respect to
         such Membership Interest; provided that such Member shall remain fully
         liable for all liabilities and obligations relating to such Membership
         Interest that accrued prior to such Transfer;

                  (f) The Company may, in its reasonable discretion, charge a
         Member a reasonable fee to cover administrative expenses necessary to
         effect the Transfer of all or part of such Member's Membership
         Interest;

                  (g) In the absence of the substitution (as provided herein) of
         a Transferee for a Transferor, any payment by the Company to the
         Transferor shall acquit the Company and the Members of all liability to
         any other Persons who may be interested in such payment by reason of a
         Transfer by such Member;

                  (h) Notwithstanding any term or condition contained in
         Sections 3.5, 3.6 and 3.7, any Person shall have the right to grant a
         Security Interest in any rights or obligations such Person may have
         arising from or related to this Agreement, the Company or any interest
         therein and make a Transfer in connection with any such Security
         Interest; provided that such Security Interest is not created in
         violation of Sections 3.5(a) and (i) of this Agreement and any other
         provisions contained in this Agreement and the Company is promptly
         notified in writing of such Security Interest; and

                  (i) Each Member or Transferee agrees not to Transfer all or
         any part of its Membership Interest (or take or omit any action,
         filing, election, or other action which could result in a deemed
         Transfer) if such Transfer (either considered alone or in the aggregate
         with prior Transfers by the same Member or any other Members or
         Transferees) would result in the termination of the Company for federal
         income tax purposes. Such an attempted Transfer is void ab initio.

                  (j) Notwithstanding any contrary provision contained in this
         Agreement, no Person shall Transfer to any other Person such Person's
         rights or obligations arising from or related to this Agreement, the
         Company or any interest therein if such Transfer would result in
         violation of the Act or any other Laws. Any such attempted Transfers
         are void ab initio.

         3.6 TRANSFER RESTRICTIONS.

                  (a) Neither the Company nor any of the Members shall be bound
         or otherwise affected by any Transfer of Membership Interest of which
         such Person has not received notice pursuant to Section 3.7.

                  (b) Any Member's Membership Interest may be Transferred to an
         Affiliate of such Member; provided, that, if the Transferor's
         Membership


                                       22
<PAGE>   27

         Interest is subject to a guaranty, the guaranty shall apply to the
         Transferee and its Membership Interest. Notwithstanding the foregoing,
         any such Transfer shall be void and have no effect unless such Transfer
         is made simultaneously with an equal and proportionate transfer of
         membership interest in Ocean Breeze Pipeline Company, L.L.C.

                  (c) Subject to the right of first refusal set forth in Section
         3.6(e), a Member may Transfer all or any portion of its Membership
         Interest to any Person that has a net worth calculated in accordance
         with GAAP of not less than $150,000,000 immediately prior to the
         Transfer; provided that such net worth requirement shall not apply in
         the case of a Foreclosure Transfer. Notwithstanding the foregoing, any
         such Transfer shall be void and have no effect unless such Transfer is
         made simultaneously with an equal and proportionate transfer of
         membership interest in Ocean Breeze Pipeline Company, L.L.C.

                  (d) Except with respect to a Foreclosure Transfer, a Member in
         Default shall not Transfer its Membership Interest.

                  (e) Except with respect to Transfers according to the terms of
         Section 3.6(b), any Member who desires to Transfer all or any portion
         of its Membership Interest ("Transferring Member") to a ready, willing
         and able Transferee shall first offer to transfer such Membership
         Interest and the related membership interest in Ocean Breeze Pipeline
         Company, L.L.C. (collectively, the "Subject Interest") to the other
         Members (the "Non-Transferring-Members") as a group. Such offer shall
         be made by an irrevocable written offer (the "Offer Notice") to
         transfer all of the Subject Interest which the Transferring Member
         desires to Transfer and shall contain a complete description of the
         transaction in which the Transferring Member proposes to Transfer the
         Subject Interest, including, without limitation, the name of the ready,
         willing and able Transferee and the consideration specified. The
         Non-Transferring Members shall have 45 days (the "Option Period") after
         actual receipt of the Offer Notice within which to advise the
         Transferring Member whether or not they will acquire all of such
         Subject Interest upon the terms and conditions contained in the Offer
         Notice. If, within the Option Period, one or more Non-Transferring
         Members elect to acquire such Subject Interest, then such
         Non-Transferring Member or Members shall close such transaction in
         accordance with Section 3.6(f) no later than the later to occur of (i)
         the closing date set forth in the Notice Offer or (ii) 60 days after
         the last day of the Option Period.

                  If any Non-Transferring Member does not elect to acquire its
proportionate share of the Subject Interest being transferred, the remaining
Non-Transferring Members shall have the right to acquire an equal and undivided
portion of the remaining Subject Interest based on the relation of their
Membership Interest to the Membership Interest of all Non-Transferring Members
desiring to acquire a portion of such Membership Interest. The right herein
created in favor of the Non-Transferring

                                       23
<PAGE>   28

Members as a group is an option to acquire all, or none, of the Subject Interest
offered for sale by the Transferring Member. If the Non-Transferring Members as
a group decline to acquire all of the Subject Interest of the Transferring
Member in accordance with this Section 3.6(e), the Transferring Member may
Transfer such Subject Interest to the Transferee named in the Offer Notice
delivered to the Non-Transferring Members upon the terms described in such Offer
Notice. If such Transfer does not occur in accordance with the terms of such
Offer Notice, the Transferring Member shall again be subject to the provisions
of this Section 3.6(e).

                  Upon consummation of any such Transfer (whether to a Member or
any other Person), such Transferee and its Membership Interest shall
automatically become a party to and be bound by this Agreement and shall
thereafter have all of the rights and obligations of a Member hereunder.
Notwithstanding the foregoing, all Transfers pursuant to this Section 3.6(e)
must also comply with and be governed by this Agreement, including any
restrictions on Transfers therein and on any Transferee becoming a Substituted
Member.

                  If any portion of the consideration set forth in the Offer
Notice is to be paid in a form other than cash or cash equivalents (including
real or personal property, promissory notes, securities, contractual benefits,
assumption of liabilities or anything else of value) ("Non-Cash Consideration"),
the Transferring Member shall state in its Offer Notice its determination of the
aggregate fair market value of such Non-Cash Consideration (which, in the case
of marketable securities, shall be the market price of such securities). If a
majority in interest of the Non-Transferring Members (calculated without
reference to the Membership Interest of the Transferring Member) disagree with
such determination, they shall notify the Transferring Member of such
disagreement within 5 Business Days of receiving the Offer Notice. If such
dispute is not resolved within 5 Business Days after such notice, any Member may
submit such dispute to binding arbitration by delivering an arbitration notice
to the other Members and the Company. The Member initiating arbitration shall
also simultaneously file duplicate copies of its notice of arbitration with the
regional office of the CPR Institute for Dispute Resolution (the "CPR
Institute") covering Houston, Texas, together with the appropriate fee as
provided in the CPR Institute's administrative fee schedule. The notice of
arbitration shall contain a brief description of the nature of the dispute to be
arbitrated. With respect to any such arbitration, the Members hereby agree that:
(i) the single arbitrator shall be an appraiser or investment banking firm
having expertise in the valuation of the types of assets represented by the
Non-Cash Consideration; (ii) the arbitration proceedings shall be held in
Houston, Texas at such location selected by the arbitrator; (iii) all
arbitration proceedings under this Section shall be conducted in accordance with
the Commercial Arbitration Rules of the CPR Institute, as then amended and in
effect; and such rules shall be interpreted and applied and questions regarding
the arbitration process not resolved under such rules shall be determined in
accordance with the Uniform Arbitration Act, as enacted in the State of
Delaware; provided, however, that the arbitrator shall resolve such dispute with
respect to the application and/or interpretation of such rule or rules within
ten days from the day a Member submitted its notice of arbitration to the other
Members, the Company and the


                                       24
<PAGE>   29

CPR Institute; (iv) within 5 Business Days following the receipt of the initial
arbitration notice by the Company, the Transferring Member and a designee of the
majority in interest of the Non-Transferring Members shall each submit to each
of the other Members, the Company and the CPR Institute a response in which it
proposes a single determination of the fair market value; and (v) the arbitrator
shall be required to select either the determination of the Transferring Member
or the determination of the designee of such majority in interest. The
consideration shall then be an amount of money, payable in cash, equal to the
total consideration stated in the Offer Notice, including the Fair Market Value
of any Non-Cash Consideration as determined in accordance with this Section.

                  (f) At the closing of the Transfer of a Membership Interest
         pursuant to this Agreement, the Transferee shall deliver to the
         Transferor the full consideration agreed upon. Any membership interest
         transfer or similar taxes involved in such sale shall be paid by the
         Transferor, and the Transferor shall provide the Transferee with such
         evidence of the Transferor's authority to Transfer hereunder and such
         tax lien waivers and similar instruments as the Transferee may
         reasonably request.

                  (g) If any governmental consent or approval is required with
         respect to any Transfer, the Transferee shall have a reasonable amount
         of time (not to exceed 60 days from the date upon which such Transfer
         would have been otherwise consummated in accordance with the terms of
         this Agreement) to obtain such consent or approval. All Members shall
         use reasonable, good faith efforts to cooperate with the Transferee
         attempting to obtain, and to assist in timely obtaining, such consent
         or approval; provided that no Member shall be required to incur any
         out-of-pocket costs in connection with such cooperation and assistance.
         After the expiration of such waiting period, such Transferee shall
         forfeit its rights to acquire the Subject Interest with respect to such
         specific transaction; provided, however, that such forfeiture shall not
         limit or otherwise affect the forfeiting Transferee's rights with
         respect to any subsequent proposed Transfer.

                  (h) No Transfer of a Membership Interest shall effect a
         release of the Transferor from any liabilities or obligations to the
         Company or the other Members that accrued prior to the Transfer.

         3.7 DOCUMENTATION; VALIDITY OF TRANSFER. The Company may not recognize
for any purpose any purported Transfer of all or any part of a Membership
Interest unless and until the applicable provisions of Sections 3.5 and 3.6 have
been satisfied and the Company has received, on behalf of the Company, a
document in a form acceptable to the Company executed by both the Transferor (or
if the Transfer is on account of the death, incapacity, or liquidation of the
Member, its representative) and the Transferee. Such document shall (i) include
the notice address of any Person to be admitted to the Company as a Substituted
Member and such Person's agreement to be bound by this Agreement with respect to
the Membership Interest or part thereof


                                       25
<PAGE>   30

being obtained, (ii) set forth the Membership Interest after the Transfer of the
Transferor and the Person to which the Membership Interest or part thereof is
Transferred (which together must total the Membership Interest of the Transferor
before the Transfer), (iii) contain a representation and warranty that the
Transfer was made in accordance with all applicable Laws (including state and
federal securities Laws) and the terms and conditions of this Agreement, and
(iv) if the Person to which the Membership Interest or part thereof is
Transferred is to be admitted to the Company as a Substituted Member, its
representation and warranty that the representations and warranties in Section
3.4 are true and correct with respect to such Person. Each Transfer and, if
applicable, admission complying with the provisions of this Section 3.7 and
Sections 3.5 and 3.6 is effective against the Company as of the first business
day of the calendar month immediately succeeding the month in which (y) the
Company receives the document required by this Section 3.7 reflecting such
Transfer, and (z) the other requirements of Sections 3.5 and 3.6 have been met.

         3.8 [RESERVED.]

         3.9 POSSIBLE ADDITIONAL RESTRICTIONS ON TRANSFER. Notwithstanding
anything to the contrary contained in this Agreement, in the event of (i) the
enactment (or imminent enactment) of any legislation, (ii) the publication of
any temporary or final regulation by the Treasury Department ("Treasury
Regulation"), (iii) any ruling by the Service or (iv) any judicial decision that
in any such case, in the opinion of counsel to the Company, would result in the
taxation of the Company for federal income tax purposes as a corporation or
would otherwise subject the Company to being taxed as an entity for federal
income tax purposes, this Agreement shall be deemed to impose such restrictions
on the Transfer of a Membership Interest as may be required, in the opinion of
counsel to the Company, to prevent the Company from being taxed as a corporation
or otherwise being taxed as an entity for federal income tax purposes, and the
Members thereafter shall amend this Agreement as necessary or appropriate to
impose such restrictions.

         3.10 ADDITIONAL MEMBERSHIP INTERESTS. Additional Persons may be
admitted to the Company as Members, and Membership Interests may be created and
issued to those Persons and to existing Members upon a unanimous vote by the
Members and subject to the terms and conditions of this Agreement. Such
admission must comply with any additional terms and conditions the Members may
in their sole discretion determine at the time of admission. A document, in a
form acceptable to the Company, shall specify the terms of admission or issuance
and shall include, among other things, the Membership Interest applicable
thereto. Any such admission of a new Member also must comply with the provisions
of Section 3.5(d). The provisions of this Section 3.10 shall not apply to
Transfers of Membership Interests.

         3.11 CODE SECTION 708 TRANSFERS.

                  (a) A Member that is not a natural person may not cause or
         permit an interest, direct or indirect, in itself to be Transferred
         such that, after the


                                       26
<PAGE>   31

         Transfer, the Company would be considered to have terminated within the
         meaning of section 708 of the Code.

                  (b) On any breach of the provisions of Section 3.11(a), the
         Company shall have (i) the right to consent to such Transfer or (ii)
         the option to buy, and, on exercise of that option, the breaching
         Member shall sell, the breaching Member's Membership Interest, all in
         accordance with Section 11.1, as if the breaching Member were a
         Bankrupt Member.

         3.12 INFORMATION.

                  (a) In addition to the other rights specifically set forth in
         this Agreement, each Member is entitled to all information to which
         that Member is entitled to have access pursuant to the Act under the
         circumstances and subject to the conditions therein stated.

                  (b) The Members acknowledge that, from time to time, they may
         receive information from or regarding the Company, its customers or any
         other Member or its Affiliates in the nature of trade secrets or secret
         or proprietary information or information that is otherwise
         confidential, the release of which may be damaging to the Company or
         the Member or its Affiliates , as applicable, or Persons with which
         they do business. Each Member shall hold in strict confidence any such
         information it receives and may not disclose such information to any
         Person other than another Member, except for disclosures (i) to comply
         with any Laws, (ii) to Affiliates , advisers or representatives of the
         Member or Persons to which that Member's Membership Interest may be
         Transferred as permitted by this Agreement, but only if the recipients
         of such information have agreed to be bound by the provisions of this
         Section 3.12(b), (iii) of information that a Member also has received
         from a source independent of the Company and that such Member
         reasonably believes such source obtained such information without
         breach of any obligation of confidentiality, (iv) of information
         obtained prior to the formation of the Company, provided that this
         clause (iv) shall not relieve any Member or any of its Affiliates from
         any obligations it may have to any other Member or any of its
         Affiliates under any existing confidentiality agreement, (v) to
         lenders, accountants and other representatives of the disclosing Member
         with a need to know such information, provided that the disclosing
         Member shall be responsible for such representatives' use and
         disclosure of any such information, or (vi) of public information. The
         Members acknowledge that a breach of the provisions of this Section
         3.12(b) may cause irreparable injury to the Company or another Member
         for which monetary damages are inadequate, difficult to compute, or
         both. Accordingly, the Members agree that the provisions of this
         Section 3.12(b) may be enforced by injunctive action or specific
         performance.

                  (c) The Members acknowledge that, from time to time, the
         Company may need information from any or all of such Members for
         various reasons,


                                       27
<PAGE>   32

         including, without limitation, for complying with various federal and
         state regulations. Each Member shall provide to the Company all
         information reasonably requested by the Company within a reasonable
         amount of time from the date such Member receives such request;
         provided, however, that no Member shall be obligated to provide such
         information to the Company to the extent such disclosure (i) could
         reasonably be expected to result in the breach or violation of any
         contractual obligation (if a waiver of such restriction cannot
         reasonably be obtained) or Law or (ii) involves secret, confidential or
         proprietary information.

         3.13 LIABILITY TO THIRD PARTIES. Except as required by the Act, no
Member shall be liable to any Person (including any third party or to another
Member) (i) as the result of any act or omission of another Member or (ii) for
Company losses, liabilities or obligations (except as otherwise expressly agreed
to in writing by such Member).

         3.14 RESIGNATION. Except to the extent expressly permitted by Section
3.17, each Member hereby covenants and agrees that it will not resign from the
Company as a Member.

         3.15 LACK OF MEMBER AUTHORITY. No Member has the authority or power to
act for or on behalf of the Company, do any act that would be binding on the
Company, or incur any expenditures on behalf of the Company, unless expressly
authorized to do so in writing by the Company.

         3.16 [RESERVED.]

         3.17 FAILURE TO ACCEPT NAUTILUS CONSTRUCTION CERTIFICATE. Except for
Section 3.18, notwithstanding any provision of this Agreement to the contrary,
the Members hereby agree that, subject to the terms and conditions of this
Section, any Member shall have the right (the "Termination Right") to cause the
prompt dissolution and liquidation of the Company and its Subsidiaries if the
construction authorization requested by Nautilus in its Application for
Certificates of Public Convenience and Necessity and Request for Expedited
Action (FERC Docket No. CP96-790 et al.) (the "Construction Certificate") is not
acceptable to such Member for any reason. The Termination Right may be exercised
only by voting to reject the Construction Certificate at the meeting at which
such vote is considered, which meeting shall be held on the first Business Day
immediately following the 12th day after the date on which the Construction
Certificate is issued (the "Termination Time"). Each Member which either votes
to accept the Construction Certificate or abstains on such vote or fails to
attend such meeting shall be deemed to have voted in favor of acceptance of the
Construction Certificate and shall have waived its right to exercise the
Termination Right. At least five days prior to such meeting, the Members shall
convene to discuss issues and positions related to the Construction Certificate.
At such time as the Company has voted to accept the Construction Certificate,
the rights and obligations created by this Section shall automatically and
permanently terminate. If any Member exercises the Termination Right in
accordance with the terms and conditions of this


                                       28
<PAGE>   33
Section, and subject to the rights created by Section 3.17(d) to acquire Manta
Ray and/or Nautilus after all liabilities have been discharged or for which firm
arrangements have been made and all assets (other than rights of way and
regulatory certificates or approval(s)) have been distributed to the Members,
the Company and its Subsidiaries shall be dissolved and liquidated promptly
using the general procedures set forth in Article XII subject to the following:

                  (a) The intent of the dissolution and liquidation is, to the
         extent practicable, for each Member (including its affiliates) to be
         returned to substantially the same position which it held prior to the
         Formation Date, which intent includes (i) returning to each Member
         (including its affiliates) the assets and liabilities which it
         contributed, (ii) having Leviathan Holding own and control, and bear
         the risk and receive any gain or assume any loss associated with the
         Manta Ray Phase I Facilities (including the related compressor), (iii)
         having Shell Holding and Marathon Holding own and control the new pipe
         and related materials on terms and conditions substantially similar to
         those set forth in the August 15th, 1996 Letter Agreement between
         Marathon Oil Company and Shell Gas Pipeline Company, and bear the risk
         and receive any gain or assume any loss associated with the purchase
         and holding of new pipe and the related construction activities and
         (iv) having each Member share any other gains and losses from the sale
         of all remaining assets and all remaining liabilities of the Company
         and its Subsidiaries in proportion to its Membership Interest.

                  (b) All of the non-cash assets contributed to the Company or
         the applicable Subsidiary shall be reconveyed, free and clear of all
         liens and encumbrances (other than liens or encumbrances created prior
         to the conveyance of such assets to the Company or the applicable
         Subsidiary), to the Person which conveyed such non-cash assets to the
         Company or such Subsidiary in exchange for such assignee assuming any
         obligations related to such assets.

                  (c) [RESERVED]

                  (d) If any Member exercises the Termination Right, any one or
         more Members (including their Affiliates ) which (i) voted in favor of
         accepting the Construction Certificate and (ii) desire to proceed with
         all or any portion of the Manta Ray System and/or the Nautilus System,
         shall have the right, until 1:00 p.m. (Central Time) on the
         twenty-fifth day following issuance of the Construction Certificate to
         be conveyed, as soon as reasonably practicable, all of the membership
         interest in Nautilus and/or Manta Ray, as applicable, in lieu of
         dissolving Nautilus and/or Manta Ray, as applicable, free and clear of
         all liens or encumbrances, immediately following the liquidation of all
         of the other assets and liabilities pursuant to Section 3.17(a) and
         3.17(b)(or after other firm provisions have been made with respect to
         such liabilities). The conveyance will be made without payment of
         additional consideration, except that the proceeding Members shall be
         obligated to repay to the other Members any amounts expended to acquire
         any right of way or regulatory permit or approval


                                       29
<PAGE>   34

         retained by Nautilus or Manta Ray, as applicable. Any such right of way
         or regulatory permit or approval retained by Nautilus or Manta Ray, as
         applicable, shall be owned by such Company free and clear of all liens
         and encumbrances (other than liens or encumbrances created prior to the
         conveyance of such assets to the Company or the applicable Subsidiary).

         3.18 OTHER CONTINGENCIES. Notwithstanding any rights set forth in
Section 3.17, the Members shall have the following rights and obligations
created by, and for the periods set forth in, this Section 3.18.

                  (a) If the declaratory order respecting the non-jurisdictional
         status of the Manta Ray Phase II Facilities or, in the alternative, a
         certificate of public convenience and necessity under the NGA
         authorizing the construction of the Manta Ray Phase II Facilities has
         been issued on or before April 1, 1997 then the Members agree to
         promptly proceed with the construction of the Manta Ray Phase II
         Facilities. If such facilities are constructed as facilities not
         subject to the NGA, they will be owned by Manta Ray; otherwise they
         will be owned by Nautilus or such entity as the Members unanimously
         agree upon.

                  (b) If either the declaratory order or the certificate of
         public convenience and necessity referred to in (a) above has been
         issued on or before April 1, 1997 but the Construction Certificate has
         not been issued on or before April 1, 1997, any Member which reasonably
         believes that the Construction Certificate will not be issued by
         June 1, 1997 shall have the right, until April 10, 1997, to eliminate
         the obligations of the Members to proceed with the construction of the
         Nautilus Initial Facilities and to cause the Membership Interests to be
         adjusted in accordance with Section 3.18(e); however, no Membership
         Interest adjustment shall be made if two or more Members elect to
         promptly reconstitute Nautilus and proceed with the Nautilus Initial
         Facilities and such reconstituting Members have both (x) received a
         Construction Certificate and (y) begun Nautilus Initial Facilities
         construction, by December 1, 1998, otherwise by December 31, 1998 the
         Membership Interests shall be adjusted in accordance with Section
         3.18(e) and Leviathan Holding, if it is not one of the reconstituting
         Members, shall be reimbursed an amount equal to the value Leviathan
         Holding would have realized had the Reconciliation Adjustment under
         Section 3.18(e) been made on the Reconciliation Date plus a cost of
         capital adjustment equal to ten and one-half percent (10.5%). If the
         reconstituting Members construct the Nautilus Initial Facilities, such
         Members agree to use good faith reasonable efforts to maintain the
         transport rates on the Nautilus System agreed to in the Precedent
         Agreements between (i) Shell Offshore Inc., Shell Deepwater Development
         Inc., Shell Deepwater Production Inc., and Nautilus and (ii) Marathon
         Oil Company and Nautilus subject to the other terms and conditions of
         such Precedent Agreements.

                  (c) If neither the declaratory order nor the certificate of
         public convenience and necessity referred to in (a) above has been
         issued on or before


                                       30
<PAGE>   35

         April 1, 1997 but the Construction Certificate has been issued on or
         before April 1, 1997, then the Members shall use commercially
         reasonable good faith efforts to construct alternative facilities in
         lieu of the Manta Ray Phase II Facilities, which facilities would be
         designed to achieve, as nearly as possible, the same practical benefits
         anticipated to be derived from the Manta Ray Phase II Facilities and
         the decision as to the alternative facilities shall be made by a
         Majority Interest.

                  (d) If neither the declaratory order nor the certificate of
         public convenience and necessity referred to in (a) above has been
         issued on or before April 1, 1997 and the Construction Certificate has
         not been issued on or before April 1, 1997, then each Member shall have
         the right to elect, until April 10, 1997, to cause the prompt
         dissolution and liquidation of the Company, Nautilus and Manta Ray on
         terms and conditions substantially similar to those set forth in
         Section 3.17.

                  (e) If any Member properly exercises its rights to adjust the
         Membership Interests pursuant to this Section 3.18(e), such adjustment
         shall be made in accordance with the following general procedures:

                           (i) If only the Manta Ray Phase II Facilities are
                  built and such facilities are constructed pursuant to a
                  Certificate of Public Convenience and Necessity under the NGA,
                  such facilities will be owned by Nautilus, and the Members
                  agree they will promptly vote to cause Nautilus or Manta Ray,
                  as applicable to promptly reconvey any excess pipe and other
                  assets which were purchased for the Nautilus Initial
                  Facilities to Shell Holding and Marathon Holding free of any
                  liens or encumbrances (other than liens or encumbrances
                  created prior to the conveyance of such assets to the Company,
                  Ocean Breeze, or the applicable Subsidiary);

                           (ii) Subject to Section 3.18(e)(vii) if the Manta Ray
                  Phase II Facilities are not subject to regulation under the
                  NGA, such facilities will be owned by Manta Ray, and the
                  Members agree they will vote to cause Nautilus to be dissolved
                  pursuant to Section 3.17(a).

                           (iii) [RESERVED].

                           (iv) [RESERVED].

                           (v) Once the actions contemplated in Section
                  3.18(e)(i-iv) have been taken, all references in this
                  Agreement to the Manta Ray System and the Nautilus System
                  shall be amended accordingly;

                           (vi) On the Reconciliation Date, the Membership
                  Interests of the Members will be adjusted to equal the new
                  ownership interests of


                                       31
<PAGE>   36

                  Shell Holding equal to 45%, Leviathan Holding equal to 35%,
                  and Marathon Holding equal to 20%. Upon the adjustment of the
                  Membership Interests in the manner set forth in the preceding
                  sentence, (i) the definition of "Majority Interest" in Section
                  1.1 will be amended to replace each reference to "50%" with a
                  reference to "55%," (ii) the definition of "Super-Majority
                  Interest" in Section 1.1. shall be deemed to be amended to
                  replace each reference to "74%" with a reference to "64%" and
                  (iii) Exhibit A shall be deemed to be amended to reflect the
                  adjusted Membership Interests set forth above; and

                           (vii) In lieu of the Members causing the dissolution
                  and liquidation of Nautilus in accordance with this Section
                  3.18 and subject to Section 3.17(a)(iii), the Members which
                  desire to continue to seek the Construction Certificate shall
                  have the right to be conveyed, as soon as reasonably
                  practicable, all of the membership interest in Nautilus free
                  and clear of all liens and encumbrances immediately following
                  the liquidation of all of the other assets and liabilities
                  pursuant to Section 3.18 (or after firm provisions have been
                  made with respect to such liabilities). The conveyance will be
                  made without payment of additional consideration, except that
                  the proceeding Members shall be obligated to repay to the
                  other Members any amounts expended to acquire any right of way
                  or regulatory permit or approval retained by Nautilus. Any
                  such right of way or regulatory permit or approval retained by
                  Nautilus shall be owned free and clear of all liens or
                  encumbrances (other than liens and encumbrances created prior
                  to the conveyance of such assets to the Company or Nautilus,
                  as applicable).


                                  ARTICLE IV.
                              CAPITAL CONTRIBUTIONS

         4.1 INITIAL CAPITAL CONTRIBUTIONS. The Members shall make the following
Capital Contributions as further described in Exhibit A (the "Initial Capital
Contributions"):

                  (a) Contributions by each Member of amounts equal to the cash
         paid by such Member on behalf of the Company for certain costs and
         expenses related to the formation of the Company and incurred by such
         Member prior to the date hereof, which amounts are set forth on Exhibit
         A.

                  (b) Contributions by the applicable Members or their
         Affiliates on behalf of such Members of non-cash assets and such other
         assets as set forth in Exhibit A to be made contemporaneously with the
         execution of this Agreement. The Asset Value of each such contribution
         shall be credited to the contributing Member's Capital Account,
         together with a Reconciliation Adjustment thereon, with respect to (i)
         all such contributions made by or on behalf of Marathon


                                       32
<PAGE>   37

         Holding and (ii) all such contributions made by or on behalf of Shell
         Holding; provided, however, that no such Reconciliation Adjustment
         shall be applied to Shell Holding's Boxer Line or any other contributed
         assets, including the Manta Ray System except as provided in Section
         4.1(d) below;

                  (c) Contributions by Shell Holding and Marathon Holding of
         cash not previously covered in (a) above, in amounts equal to 67.27%
         and 32.73%, respectively, of 100% of all amounts incurred by the
         Company prior to the Reconciliation Date to design, construct, install
         and place in service the Manta Ray Phase II Facilities and the Nautilus
         Initial Facilities constructed prior to the Reconciliation Date. Such
         contributions shall be made as necessary to allow the Company to timely
         pay such obligations as they become due. If Shell Holding determines
         from time to time in good faith that any such Capital Contributions may
         be necessary and in the best interest of the Company to timely complete
         such work the Company expects to be obligated to pay on or about a
         certain date, then Shell Holding shall send written notice to the other
         Members specifying (i) the aggregate amount of such Capital
         Contributions reasonably and in good faith deemed necessary by such
         Member and each Member's allocable share thereof and (ii) the date by
         which such Capital Contributions shall be made to the Company by Shell
         Holding or Marathon Holding (which date shall not be less than ten
         Business Days from the date on which the notice is sent). Each of
         Marathon Holding and Shell Holding shall thereafter contribute cash to
         the Company in an amount equal to such Member's allocable share of the
         amount of Capital Contribution on or before the date specified in such
         notice. All Initial Capital Contributions consisting of cash shall be
         held in an account until such time as such funds are used to fund the
         construction costs except to the extent that all of the Members agree
         that the applicable portion of any such Initial Capital Contribution is
         no longer needed to finance such construction costs or the operations
         of the Company. All such contributions, together with a Reconciliation
         Adjustment thereon, shall be credited to the contributing Members'
         Capital Account;

                  (d) Contributions by Leviathan Holding of cash and assets in
         amounts equal to 100% of all amounts incurred to acquire, install and
         place in service a compression package, including a 7,000 +/- HP unit
         as well as any other compression-related equipment related thereto not
         already installed. Such contributions shall be made as necessary to
         allow the Company to timely pay such obligations as they become due.
         All such contributions, together with a Reconciliation Adjustment
         thereon shall be credited to Leviathan Holding's Capital Account;

                  (e) Reconciling contributions from or distributions to the
         applicable Member or Members paid within 15 Business Days following the
         Reconciliation Date to the extent necessary to adjust each Member's
         Capital Account balance as of the Reconciliation Date, after all other
         Reconciliation Date adjustments have been made, by an amount equal to
         the difference, if any,


                                       33
<PAGE>   38

         between (i) the product of (a) the aggregate Capital Accounts on the
         Reconciliation Date multiplied by (b) such Member's Membership Interest
         as set forth on Exhibit A, or if applicable in Section 3.18(e) minus
         (ii) such Member's Capital Account balance. Any such positive
         difference shall result in a contribution, and any such negative
         difference shall result in a distribution, such that, after all such
         contributions and distributions, the Capital Accounts in the aggregate,
         shall remain unchanged; and

                  (f) Other than the contributions set forth in Section
         4.1(a)-(e), contributions by each Member of cash in amounts equal to
         its proportionate Membership Interest (on the date such contribution
         accrues) share of 100% of all amounts incurred to design, construct,
         install and place in service the Manta Ray Phase II Facilities and the
         Nautilus Initial Facilities. Such contributions shall be made as
         necessary to allow the Company to timely pay such obligations as they
         become due. If Shell Holding determines from time to time in good faith
         that any such Capital Contributions may be necessary and in the best
         interest of the Company to timely complete such work the Company
         expects to be obligated to pay on or about a certain date, then Shell
         Holding shall send written notice to the other Members specifying (i)
         the aggregate amount of the Capital Contributions reasonably and in
         good faith deemed necessary by such Member and each Member's allocable
         share thereof and (ii) the date by which such additional Capital
         Contributions shall be made to the Company by each Member (which date
         shall not be less than ten Business Days from the date on which the
         notice is sent). Each Member shall thereafter contribute cash to the
         Company in an amount equal to such Member's Membership Interest share
         of the amount of the Capital Contribution on or before the date
         specified in such notice. All Initial Capital Contributions consisting
         of cash shall be held in an account until such time as such funds are
         used to fund the construction costs except to the extent that all of
         the Members agree that the applicable portion of any such Initial
         Capital Contribution is no longer needed to finance such construction
         costs or the operations of the Company.

         4.2 SUBSEQUENT CONTRIBUTIONS. Unless unanimously agreed to in writing
by the Members, no Member shall be required to make any Capital Contributions
other than the Initial Capital Contributions as contemplated by Section 4.1;
provided, that, notwithstanding any provisions in this Agreement to the
contrary, no Member shall be required to make any Capital Contribution, other
than an Initial Capital Contribution, if such Member did not vote to approve
such Capital Contribution.

         4.3 FAILURE TO CONTRIBUTE.

                  (a) If a Member does not contribute by the time required all
         or any portion of a Capital Contribution such Member ("Delinquent
         Member") is required to make as provided in this Agreement, any one or
         more non-Delinquent Members may advance the entire amount of the
         Delinquent


                                       34
<PAGE>   39

         Member's Capital Contribution that is in Default, with each
         non-Delinquent Member electing to participate making its share of such
         advance in proportion to its Membership Interest or in such other
         percentages as the participating Members may agree. Each non-Delinquent
         Member who makes such an advance on behalf of a Delinquent Member shall
         have the right to designate the extent to which such advance will (x)
         constitute a loan to the Delinquent Member and/or (y) result in an
         immediate adjustment of the Membership Interests of the Delinquent
         Member and the non-Delinquent Member making such election; provided,
         however, that if the advancing non-Delinquent Member does not notify
         the Company of its election to have all, or any portion of such advance
         treated as a loan to the Delinquent Member, in writing, at the time the
         advance is made then such advance shall automatically result in an
         immediate adjustment of the Membership Interests:

                           (i) To the extent one or more non-Delinquent Members
                  does not elect to have an advance pursuant to Section 4.3(a)
                  treated as a loan to the Delinquent Member, or affirmatively
                  elects to have such advance result in an adjustment of the
                  Membership Interests, the Company shall automatically adjust
                  the Membership Interest for each Member to equal the
                  percentage obtained by dividing (A) the Capital Account of
                  such Member (including any Capital Contribution made by such
                  Member under this Section by (B) the aggregate Capital
                  Accounts of all Members (including all Capital Contributions
                  made under this Section). Upon the adjustment of the
                  Membership Interests in the manner set forth in the preceding
                  sentence, Exhibit A shall be deemed to be amended to reflect
                  such adjusted Membership Interests. Notwithstanding the
                  foregoing, the Delinquent Member shall have the right to
                  re-acquire the interest in question from the advancing
                  non-Delinquent Member within 30 days following the date on
                  which such Membership Interest adjustment is made by paying
                  the entire amount advanced by such non-Delinquent Member in
                  return for such adjustment, plus 12 percent per annum.

                           (ii) To the extent one or more non-Delinquent Members
                  (the "Lending Member," whether one or more) does elect to have
                  an advance pursuant to Section 4.3(a) constitute a loan to the
                  Delinquent Member, such advance shall have the following
                  results:

                                    (1) the sum advanced shall constitute a loan
                           from the Lending Member to the Delinquent Member and
                           a Capital Contribution of that sum to the Company by
                           the Delinquent Member pursuant to the applicable
                           provisions of this Agreement,

                                    (2) the principal balance of the loan and
                           all accrued unpaid interest thereon (collectively,
                           the "Obligation") shall be due and payable in whole
                           on the tenth Business Day after the day written
                           demand requesting payment of the Obligation is made
                           by


                                       35
<PAGE>   40

                           the Lending Member to the Delinquent Member;
                           provided, however that the Delinquent Member may
                           prepay the Obligation in whole or in part at any time
                           prior to the date due.

                                    (3) the amount lent shall bear interest at
                           the Default Interest Rate from the date on which the
                           advance is deemed made until the date that the loan,
                           together with all interest accrued thereon and all
                           costs and expenses associated therewith ("Costs"), is
                           repaid to the Lending Member,

                                    (4) all distributions from the Company that
                           otherwise would be made to the Delinquent Member
                           (whether before or after dissolution of the Company)
                           instead shall be paid to the Lending Member until the
                           Obligation and any Costs have been paid in full to
                           the Lending Member (with payments being applied first
                           to accrued and unpaid interest, second to Costs, and
                           finally to principal),

                                    (5) [RESERVED.]

                                    (6) the Lending Member shall have the right,
                           in addition to the other rights and remedies granted
                           to it pursuant to this Agreement or available to it
                           at law or in equity, to take any action (including,
                           without limitation, court proceedings and exercising
                           the rights of a secured party under the Uniform
                           Commercial Code of the State of Texas) that the
                           Lending Member may deem appropriate to obtain payment
                           from the Delinquent Member of the Obligation and all
                           Costs; and

                                    (7) initially, a loan by any Member to
                           another Member as contemplated by this Section
                           4.3(a)(ii) shall not be considered a Capital
                           Contribution by the Lending Member and shall not
                           increase the Capital Account balance of the Lending
                           Member. Notwithstanding the foregoing, in the event
                           the principal and interest of any such loan have not
                           been repaid within one year from the date of the
                           loan, the Lending Member, at any time thereafter by
                           giving written notice to the Company, may elect to
                           have the unpaid principal and interest balance of
                           such loan transferred to and increase such Lending
                           Member's Capital Account with a corresponding
                           decrease in the Capital Account of the Member on
                           whose behalf such loan was made. Upon such transfer,
                           the loan shall be treated as a Capital Contribution
                           and the Membership Interest for each Member shall be
                           automatically adjusted to equal the percentage
                           obtained by dividing (A) the Capital Account of such
                           Member (including any Capital Contribution made on
                           behalf of another Member) by (B) the


                                       36
<PAGE>   41

                           aggregate Capital Accounts of all Members (including
                           all Capital Contributions made on behalf of other
                           Members). Upon the adjustment of the Membership
                           Interests in the manner set forth in the preceding
                           sentence, Exhibit A shall be deemed to be amended to
                           reflect such adjusted Membership Interests.

                  (b) If the non-Delinquent Members do not exercise the rights
         granted by Section 4.3(a) within 14 days after the Delinquent Member
         fails to make its Capital Contribution when due, then the Company, by a
         vote of a majority in interest of the non-Delinquent Members, shall
         have the right to exercise the following remedies:

                           (i) the Company may at any time take such action
                  (including, without limitation, court proceedings) as the
                  Company may deem appropriate to obtain payment by the
                  Delinquent Member of the portion of the Delinquent Member's
                  Capital Contribution that is in Default, along with all Costs
                  and expenses associated with the collection of such Delinquent
                  Member's Capital Contribution; and

                           (ii) the Company may at any time exercise any other
                  rights and remedies available at law or in equity.

         4.4 RETURN OF CONTRIBUTIONS. A Member is not entitled (i) to the return
of any part of any Capital Contributions other than any preferential or
disproportionate distributions to the extent such distributions are expressly
required to be returned by this Agreement or (ii) to be paid interest in respect
of either its Capital Account or its Capital Contributions. An unrepaid Capital
Contribution is not a liability of the Company or of any Member. A Member is not
required to contribute or to lend any cash or property to the Company to enable
the Company to return any other Member's Capital Contributions.

         4.5 CAPITAL ACCOUNTS. A separate capital account ("Capital Account")
shall be established and maintained for each Member in accordance with the rules
of Treasury Regulation section 1.704-1(b)(2)(iv) and the following terms and
conditions:


                  INCREASES AND DECREASES

                  (a) Each Member's Capital Account shall be (i) increased by
         (A) the amount of cash or cash equivalents contributed by that Member
         to the Company as capital, (B) the Net Asset Value of property
         contributed by that Member to the Company as capital, (C) the amount of
         any loans transferred by such Member to its Capital Account pursuant to
         Section 4.3(a)(ii)(7) (contributions contemplated by subparagraphs (A)
         and (B) shall be referred to as "Capital Contributions"), and (D)
         allocations to that Member of Company income and gain (or items
         thereof), including, without limitation, income and gain exempt from
         tax and income and gain described in Treasury Regulation


                                       37
<PAGE>   42

         section 1.704-1(b)(2)(iv)(g), but excluding income and gain described
         in Treasury Regulation section 1.704-1(b)(4)(i); and (ii) shall be
         decreased by (A) the amount of cash or cash equivalents distributed to
         that Member by the Company, (B) the Net Asset Value of property
         distributed to that Member by the Company, and (C) allocations of
         Company losses and deductions (or items thereof), including losses and
         deductions described in Treasury Regulation section
         1.704-1(b)(2)(iv)(g) (but excluding losses or deductions described in
         Treasury Regulation section 1.704-1(b)(4)(i) or (iii));


                  METHOD FOR DETERMINING INCOME, GAIN OR LOSS AND DEDUCTIONS

                  (b) For purposes of computing the amount of any item of
         income, gain, loss or deduction to be reflected in the Members' Capital
         Accounts, the determination, recognition and classification of any such
         item shall be the same as its determination, recognition and
         classification for federal income tax purposes (including, without
         limitation, any method of depreciation, cost recovery or amortization
         used for that purpose), provided that:

                           (i) All fees and other expenses incurred by the
                  Company to promote the sale of (or to sell) any interest that
                  can neither be deducted nor amortized under section 709 of the
                  Code, if any, shall, for purposes of Capital Account
                  maintenance, be treated as an item of deduction at the time
                  such fees and other expenses are incurred and shall be
                  allocated among the Members pursuant to Sections 5.1 and 5.2;

                           (ii) Except as otherwise provided in Treasury
                  Regulation section 1.704 1(b)(2)(iv)(m), the computation of
                  all items of income, gain, loss and deduction shall be made
                  without regard to any election under section 754 of the Code
                  which may be made by the Company and, as to those items
                  described in section 705(a)(1)(B) or 705(a)(2)(B) of the Code,
                  without regard to the fact that such items are not includable
                  in gross income or are neither currently deductible nor
                  capitalized for federal income tax purposes;

                           (iii) Any income, gain or loss attributable to the
                  taxable disposition of any Company property shall be
                  determined as if the adjusted basis of such property as of
                  such date of disposition were equal in amount to the Company's
                  Carrying Value with respect to such property as of such date;

                           (iv) In accordance with the requirements of section
                  704(b) of the Code, any deductions for depreciation, cost
                  recovery or amortization attributable to any Contributed
                  Property shall be determined as if the adjusted basis of such
                  property on the date it was acquired by the Company was equal
                  to the Asset Value of such property on the date it


                                       38
<PAGE>   43

                  was acquired by the Company. Upon an adjustment pursuant to
                  Section 4.5(d) to the Carrying Value of any Company property
                  subject to depreciation, cost recovery or amortization, any
                  further deductions for such depreciation, cost recovery or
                  amortization attributable to such property shall be determined
                  (A) as if the adjusted basis of such property were equal to
                  the Carrying Value of such property immediately following such
                  adjustment and (B) using a rate of depreciation, cost recovery
                  or amortization derived from the same method and useful life
                  (or, if applicable, the remaining useful life) as is applied
                  for federal income tax purposes; provided, however, that if
                  the asset has a zero adjusted basis for federal income tax
                  purposes, depreciation, cost recovery or amortization
                  deductions shall be determined using any reasonable method
                  that the Company may adopt; and

                           (v) any income of the Company that is exempt from
                  federal income tax and not otherwise taken into account in
                  computing Net Income or Net Loss shall be added to such
                  taxable income or loss.

                  IMPACT OF AND ADJUSTMENTS FOR SUCCESSION IN INTERESTS

                  (c) A Transferee shall succeed to the Capital Account of the
         Transferor relating to the Membership Interest so Transferred;
         provided, however, that if the Transfer causes a termination of the
         Company under section 708(b)(1)(B) of the Code, the Company's
         properties shall be deemed to have been distributed in liquidation of
         the Company to the Members (including any Transferee of a Membership
         Interest that is a party to the Transfer causing such termination)
         pursuant to Section 12.2 and recontributed by such Members in
         reconstitution of the Company. Any such deemed distribution shall be
         treated as an actual distribution for purposes of this Section 4.5. In
         such event the Carrying Values of the Company properties shall be
         adjusted immediately prior to such deemed distribution pursuant to
         Section 4.5(d)(ii) and such Carrying Values shall then constitute the
         fair market values of such properties upon such deemed contribution to
         the reconstituted Company for the purposes of determining the Asset
         Value and otherwise. The Capital Accounts of such reconstituted Company
         shall be maintained in accordance with the principles of this Section
         4.5.


                  ADDITIONAL MEMBERSHIP INTERESTS

                           (i) Consistent with the provisions of Treasury
                  Regulation section 1.704 1(b)(2)(iv)(f), on an issuance of
                  additional Membership Interests for cash or Contributed
                  Property, the Capital Accounts of all Members and the Carrying
                  Value of each Company property immediately prior to such
                  issuance shall be adjusted upward or downward to reflect any
                  Unrealized Gain or Unrealized Loss attributable


                                       39
<PAGE>   44

                  to such Company property, as if such Unrealized Gain or
                  Unrealized Loss had been recognized on an actual sale of each
                  such property immediately prior to such issuance and had been
                  allocated to the Members at such time pursuant to Section 5.1.


                  ADJUSTMENTS PRIOR TO A DISTRIBUTION

                           (ii) In accordance with Treasury Regulation section
                  1.704-1(b)(2)(iv)(f), immediately prior to any distribution to
                  a Member of any Company property (other than a distribution of
                  cash or cash equivalents that are not in redemption or
                  retirement of a Membership Interest), the Capital Accounts of
                  all Members and the Carrying Value of each Company property
                  shall be adjusted upward or downward to reflect any Unrealized
                  Gain or Unrealized Loss attributable to such Company property,
                  as if such Unrealized Gain or Unrealized Loss had been
                  recognized in a sale of such property immediately prior to
                  such distribution for an amount equal to its fair market value
                  (which shall be determined by the Company using any valuation
                  method it deems reasonable under the circumstances), and had
                  been allocated to the Members at such time, pursuant to
                  Section 5.1.

                           (iii) Upon the Reconciliation Date and in accordance
                  with Treasury Regulation Section 1.704-1(b)(2)(iv)(f), the
                  Carrying Value of the Manta Ray Phase I Facilities and the
                  Boxer Line shall be adjudged to equal $50.3 million and $4.1
                  million respectively. The excess of the Manta Ray Phase I
                  Facilities' adjudged value over the Carrying Value of the
                  Manta Ray Phase I Facilities immediately before the
                  Reconciliation Date (the "Leviathan Reconciliation Date
                  Income") and the excess of the Boxer Line's adjudged value
                  over the Carrying Value of the Boxer Line immediately before
                  the Reconciliation Date (the "Shell Reconciliation Date
                  Income") shall be allocated in accordance with Section 5.1(c).

                                   ARTICLE V.
                          ALLOCATIONS AND DISTRIBUTIONS

         5.1 ALLOCATIONS FOR CAPITAL ACCOUNT PURPOSES. In order to properly
reflect the business agreement by and among the Members, the intent of the
allocations in this Section 5.1 is to (i) treat each Member as if the Capital
Contributions of the Manta Ray Phase I Facilities and the Boxer Line were made
on the Reconciliation Date and (ii) solely for Capital Account maintenance and
federal income tax purposes income received from Manta Ray and Nautilus shall be
allocated as if derived from the operations of the Company. Therefore, for
purposes of maintaining the Capital Accounts and in determining the rights of
the Members among themselves, the Company's items of income, gain, loss and
deduction (computed in accordance with


                                       40
<PAGE>   45

Section 4.5(b)) shall be allocated among the Members in each taxable year (or
portion thereof) as provided herein below.

                  (a) Net Income. All items of income, gain, loss and deduction
         taken into account in computing Net Income for such taxable period
         shall be allocated to each of the Members in accordance with its
         respective Membership Interests; provided, however, that, during the
         period beginning on the date hereof and ending on the Reconciliation
         Date, (i) 100% of all income, gain, loss and deduction taken into
         account in computing that portion of Net Income attributable to Manta
         Ray Stub Period Income shall be specially allocated to Leviathan
         Holding and (ii) 100% of all income, gain, loss and deduction taken
         into account in computing that portion of Net Income attributable to
         Boxer Line Stub Period Income shall be specially allocated to Shell
         Holding.

                  (b) Net Losses. All items of income, gain, loss and deduction
         taken into account in computing Net Losses for such taxable period
         shall be allocated to each Member in accordance with its respective
         Membership Interests; provided, however that, during the period
         beginning on the date hereof and ending on the Reconciliation Date, (i)
         100% of all income, gain, loss and deduction taken into account in
         calculating Net Losses attributable to Manta Ray Stub Period Income
         shall be specially allocated to Leviathan Holding and (ii) 100% of all
         income, gain, loss and deduction taken into account in calculating Net
         Losses attributable to Boxer Line Stub Period Income shall be specially
         allocated to Shell Holding.

                  (c) Special Allocation of Income. Notwithstanding the other
         provisions of this Section 5.1,

                           (i) the Leviathan Reconciliation Date Income shall be
                  allocated solely to Leviathan Holding; and

                           (ii) the Shell Reconciliation Date Income shall be
                  allocated solely to Shell Holding.

                  (d) Nonrecourse Liabilities. For purposes of Treasury
         Regulation section 1.752-3(a)(3), the Members agree that Nonrecourse
         Liabilities of the Company in excess of the sum of (A) the amount of
         Company Minimum Gain and (B) the total amount of Nonrecourse Built-in
         Gain shall be allocated among the Members in accordance with their
         respective Membership Interests.

                  (e) Company Minimum Gain Chargeback. Notwithstanding the other
         provisions of this Section 5.1, except as provided in Treasury
         Regulation section 1.704-2(f)(2) through (5), if there is a net
         decrease in Company Minimum Gain during any Company taxable period,
         each Member shall be allocated items of Company income and gain for
         such period (and, if necessary, subsequent periods) in the manner and
         amounts provided in Treasury


                                       41
<PAGE>   46

         Regulation sections 1.704-2(f)(6) and (g)(2) and section
         1.704-2(j)(2)(i), or any successor provisions. For purposes of this
         Section 5.1(d), each Member's Adjusted Capital Account balance shall be
         determined, and the allocation of income or gain required hereunder
         shall be effected, prior to the application of any other allocations
         pursuant to this Section 5.1 with respect to such taxable period (other
         than an allocation pursuant to Section 5.1(h) or (i)).

                  (f) Chargeback of Minimum Gain Attributable to Member
         Nonrecourse Debt. Notwithstanding the other provisions of this Section
         5.1 (other than Section 5.1(d), except as provided in Treasury
         Regulation section 1.704-2(i)(4)), if there is a net decrease in
         Minimum Gain Attributable to Member Nonrecourse Debt during any Company
         taxable period, any Member with a share of Minimum Gain Attributable to
         Member Nonrecourse Debt at the beginning of such taxable period shall
         be allocated items of Company income and gain for such period (and, if
         necessary, subsequent periods) in the manner and amounts provided in
         Treasury Regulation sections 1.704-2(i)(4) and 1.704-2(j)(2)(ii), or
         any successor provisions. For purposes of this Section 5.1, each
         Member's Adjusted Capital Account balance shall be determined and the
         allocation of income or gain required hereunder shall be effected,
         prior to the application of any other allocations pursuant to this
         Section 5.1, other than Sections 5.1(d), (h) and (i), with respect to
         such taxable period.

                  (g) Qualified Income Offset. In the event any Member
         unexpectedly receives adjustments, allocations or distributions
         described in Treasury Regulation section 1.704-1(b)(2)(ii)(d)(4)
         through (6) (or any successor provisions), items of Company income and
         gain shall be specifically allocated to such Member in an amount and
         manner sufficient to eliminate, to the extent required by the Treasury
         Regulations promulgated under section 704(b) of the Code, the deficit
         balance, if any, in its Adjusted Capital Account created by such
         adjustments, allocations or distributions as quickly as possible unless
         such deficit balance is otherwise eliminated pursuant to Section 5.1(d)
         or 5.1(e).

                  (h) Gross Income Allocations. In the event any Member has a
         deficit balance in its Adjusted Capital Account at the end of any
         Company taxable period which is in excess of the sum of (i) the amount
         such Member is obligated to restore pursuant to any provision of this
         Agreement and (ii) the amount such Member is deemed obligated to
         restore pursuant to the penultimate sentences of Treasury Regulations
         sections 1.704-2(g)(1) and 1.704-2(i)(5), such Member shall be
         specifically allocated items of Company gross income and gain in the
         amount of such excess as quickly as possible; provided that an
         allocation pursuant to this Section 5.1(g) shall be made only if and to
         the extent that such Member would have a deficit balance in its
         Adjusted Capital Account after all other allocations provided in this
         Section 5.1 have been tentatively made as if this Section 5.1(g) was
         not in the Agreement.


                                       42
<PAGE>   47


                  (i) Nonrecourse Deductions. Nonrecourse Deductions for any
         taxable period shall be allocated to the Members in accordance with
         their respective Membership Interests. If the Company determines in its
         good faith discretion that the Company's Nonrecourse Deductions must be
         allocated in a different ratio to satisfy the safe harbor requirements
         of the Treasury Regulations promulgated under section 704(b) of the
         Code, the Company is authorized, upon notice to the Members, to revise
         the prescribed ratio to the numerically closest ratio which does
         satisfy such requirements.

                  (j) Member Nonrecourse Deductions. Member Nonrecourse
         Deductions for any taxable period shall be allocated 100% to the Member
         that bears the Economic Risk of Loss for such Member Nonrecourse Debt
         to which such Member Nonrecourse Deductions are attributable in
         accordance with Treasury Regulation section 1.704-2(i) (or any
         successor provision). If more than one Member bears the Economic Risk
         of Loss with respect to a Member Nonrecourse Debt, such Member
         Nonrecourse Deductions attributable thereto shall be allocated between
         or among such Members ratably in proportion to their respective shares
         of such Economic Risk of Loss.

         5.2 ALLOCATIONS FOR TAX PURPOSES.

                  (a) Except as otherwise provided herein, for federal income
         tax purposes, each item of income, gain, loss and deduction which is
         recognized by the Company for federal income tax purposes shall be
         allocated among the Members in the same manner as its correlative item
         of "book" income, gain, loss or deduction is allocated pursuant to
         Section 5.1 hereof.

                  (b) In an attempt to eliminate Book-Tax Disparities
         attributable to a Contributed Property or Adjusted Property, items of
         income, gain, loss, depreciation, amortization and cost recovery
         deductions shall be allocated for federal income tax purposes among the
         Members as follows:

                           (i) (A) In the case of a Contributed Property, such
                  items attributable thereto shall be allocated among the
                  Members in the manner provided under section 704(c) of the
                  Code and section 1.704-3(b) of the Treasury Regulations (i.e.
                  the "traditional method") that takes into account the
                  variation between the Asset Value of such property and its
                  adjusted basis at the time of contribution; and (B) except as
                  otherwise provided in Section 5.2(b)(iii), any item of
                  Residual Gain or Residual Loss attributable to a Contributed
                  Property shall be allocated among the Members in the same
                  manner as its correlative item of "book" gain or loss is
                  allocated pursuant to Section 5.1.

                           (ii) (A) In the case of an Adjusted Property, such
                  items shall (1) first, be allocated among the Members in a
                  manner consistent with the principles of section 704(c) of the
                  Code and section 1.704-3(b)


                                       43
<PAGE>   48


                  of the Treasury Regulations (i.e. the "traditional method") to
                  take into account the Unrealized Gain or Unrealized Loss
                  attributable to such property and the allocations thereof
                  pursuant to Section 4.5(d)(i), (ii), or (iii) and (2) second,
                  in the event such property was originally a Contributed
                  Property, be allocated among the Members in a manner
                  consistent with Section 5.2(b)(i); and (B) except as otherwise
                  provided in Section 5.2(b)(iii), any item of Residual Gain or
                  Residual Loss attributable to an Adjusted Property shall be
                  allocated among the Members in the same manner as its
                  correlative item of "book" gain or loss is allocated pursuant
                  to Section 5.1.

                           (iii) Any items of income, gain, loss or deduction
                  otherwise allocable under Section 5.2(b)(i)(B) or
                  5.2(b)(ii)(B) shall be subject to allocation by the Company in
                  a manner designed to eliminate, to the maximum extent
                  possible, Book-Tax Disparities in a Contributed Property or
                  Adjusted Property otherwise resulting from the application of
                  the "ceiling" limitation (under section 704(c) of the Code or
                  section 704(c) principles) to the allocations provided under
                  Sections 5.2(b)(i)(A) and 5.2(b)(ii)(A).

                  (c) For the proper administration of the Company, the Company
         shall (i) adopt such conventions as it deems appropriate in determining
         the amount of depreciation, amortization and cost recovery deductions;
         provided, that such depreciation, amortization and cost recovery
         methods shall be the most accelerated methods allowed under federal tax
         laws; (ii) make special curative allocations for federal income tax
         purposes of income (including, without limitation, gross income) or
         deductions pursuant to section 1.704-3(c) of the Treasury Regulations
         to eliminate the impact of the "ceiling" limitation (under section
         704(c) of the Code and section 704 principles) to the allocations
         provided in Section 5.2(b); and (iii) amend the provisions of this
         Agreement as appropriate to reflect the proposal or promulgation of
         Treasury Regulations under section 704(b) or section 704(c) of the
         Code. The Company may adopt such conventions, make such allocations and
         make such amendments to this Agreement as provided in this Section
         5.2(c) only if such conventions, allocations or amendments are
         consistent with the principles of section 704 of the Code.

                  (d) The Company may determine to depreciate the portion of an
         adjustment under section 743(b) of the Code attributable to unrealized
         appreciation in any Adjusted Property (to the extent of the unamortized
         Book-Tax Disparity) using a predetermined rate derived from the
         depreciation method and useful life applied to the Company's common
         basis of such property, despite the inconsistency of such with Proposed
         Treasury Regulation section 1.168-2(n) and Treasury Regulation section
         1.167(c)-1(a)(6), or any successor provisions. If the Company
         determines that such reporting position cannot reasonably be


                                       44
<PAGE>   49

         taken, the Company may adopt any reasonable depreciation convention
         that would not have a material adverse effect on the Members.

                  (e) Any gain allocated to the Members upon the sale or other
         taxable disposition of any Company asset shall, to the extent possible,
         after taking into account other required allocations of gain pursuant
         to this Section 5.2 be characterized as Recapture Income in the same
         proportions and the same extent as such Members (or their predecessors
         in interest) have been allocated any deductions directly or indirectly
         giving rise to the treatment of such gains as Recapture Income.

                  (f) All items of income, gain, loss, deduction and credit
         recognized by the Company for federal income tax purposes and allocated
         to the Members in accordance with the provisions hereof shall be
         determined without regard to any election under section 754 of the Code
         which may be made by the Company; provided, however, that such
         allocations, once made, shall be adjusted as necessary or appropriate
         to take into account those adjustments permitted or required by
         sections 734 and 743 of the Code.

         5.3 REQUIREMENT OF DISTRIBUTIONS. Subject to the provisions of Sections
5.6 and 7.2, and less the amount of the cash reserves, if any, set aside
pursuant to Section 5.5, the Company shall distribute (within 30 days following
the end of each calendar month) such amount of Available Cash, as determined by
the Members, to the Members who were Record Holders as of the Record Date in
accordance with their respective Membership Interests (except as otherwise
provided in Section 5.7).

         5.4 PRO RATA DISTRIBUTIONS. Except for preferential or disproportionate
distributions to the extent expressly provided for in this Agreement (including
those set forth in Section 12.2), any distributions attributable to the
Membership Interests of the Company paid in cash, property, or equity ownership
of the Company shall be allocated pro rata according to Membership Interest.

         5.5 RESERVES. Before payment of any Distributions, there may be set
aside out of any funds of the Company available for distributions such sum or
sums as the Members from time to time, in their absolute discretion, think
proper as a cash reserve or reserves to meet contingencies, for repairing or
maintaining any property of the Company, or for such other purpose as the
Members shall determine to be in the best interest of the Company; and the
Company may modify or abolish any such cash reserve in the manner in which it
was created. Any reserves established by Manta Ray or Nautilus shall be
considered in determining the appropriate reserve for the Company.

         5.6 DISTRIBUTION RESTRICTIONS. Unless unanimously agreed to in writing
by the Members, and subject to the provisions of Section 4.3, the Company shall
not distribute (i) any of the Initial Capital Contributions until the completion
of the construction of the Manta Ray Phase II Facilities and the Nautilus
Initial Facilities, except to the extent that all of the Members agree that the
applicable portion of such


                                       45
<PAGE>   50

Initial Capital Contributions is no longer needed to finance such construction
or the operations of the Company, or (ii) any amounts that would cause the
Company, Manta Ray or Nautilus to materially breach, or would create a material
default under, any debt agreements or instruments to which the Company, Manta
Ray or Nautilus is a party.

         5.7 SPECIAL DISTRIBUTIONS AND CONTRIBUTIONS. Notwithstanding anything
herein to the contrary, including the provisions of this Article V, on or before
the fifteenth Business Day of each calendar month, Company shall deliver to
Shell Holding and Leviathan Holding a statement setting forth in detail the
amounts specially allocated to Shell Holding or Leviathan Holding as Boxer Line
Stub Period Income or Manta Ray Stub Period Income, as the case may be, pursuant
to Section 5.1(a) and (b). If the Boxer Line Stub Period Income or the Manta Ray
Stub Period Income for the preceding calendar month (exclusive of non-cash items
such as depreciation and amortization) is a positive number, then the Company
will make a special distribution of such net amount to Shell Holding and/or
Leviathan Holding, as applicable, on or before the 25th day of the calendar
month in which the statement is delivered. If the Boxer Line Stub Period Income
or Manta Ray Stub Period Income for the preceding calendar month (exclusive of
non-cash items such as depreciation and amortization) is a negative number, then
Shell Holding or Leviathan Holding, as applicable, will make an additional
Capital Contribution to the Company of such net amount on or before the 25th day
of the calendar month in which the statement is delivered. Any such distribution
or contribution shall not prejudice the right of the paying party to an
adjustment of any statement. Shell Holding and Leviathan Holding and its
authorized representatives shall have the right to inspect any records of the
Company forming the basis for a statement delivered to it, and the Company
agrees to retain such records, for 36 months from the end of the calendar year
in which the applicable statement was delivered.

                                  ARTICLE VI.
                            MANAGEMENT OF THE COMPANY

         6.1 MANAGEMENT BY THE MEMBERS AND DELEGATION OF AUTHORITY. The Members
hereby unanimously agree that the business and affairs of the Company shall be
managed by or under the authority of the Members in accordance with the Act,
which Members may act through their directors, officers, employees,
representatives, agents and designees. Except for situations in which the
approval of the Members is required by this Agreement or by nonwaivable
provisions of applicable Laws, the Members shall have broad discretion to
authorize any committee constituted pursuant to Section 6.2 or any officer or
other agent to act on behalf of the Company.

         6.2 COMMITTEES. For organizational purposes, the Members may form one
or more committees of the Members. Each Member shall appoint one (or more) of
its duly authorized agents to act for the Member on any committee of the
Company. Such agents of each Member shall be given the authority by such Member
to vote on behalf of the Member on any issue within the committee's
responsibility and the agent(s) of


                                       46
<PAGE>   51

each Member shall have the right to vote on behalf of such Member in proportion
to such Member's Membership Interest.

         6.3 AUTHORITY OF MEMBERS AND COMMITTEES.

                  (a) With respect to conflicts or disagreements between and
         among any committees, the Members shall have ultimate decision making
         authority. The Members and the committees shall act through the
         Company's officers, employees, representatives, agents and designees to
         whom authority has been expressly delegated. All action of the Members
         shall be taken pursuant to resolutions approved by the Members in
         accordance with Article VII of this Agreement.

                  (b) Unless otherwise expressly delegated in writing or
         provided by this Agreement, the Members hereby reserve to the Members
         as a group the authority, with respect to the Company, to authorize and
         approve the following, or, with respect to matters to be authorized or
         approved by Subsidiaries of the Company, to determine how the Company
         will vote as a member of such Subsidiary, with respect to the
         following:

                           (i) authorizing Gas Contracts the term of which could
                  be longer than one year after the date of execution thereof;
                  provided, however, that, with respect to the Manta Ray System,
                  Leviathan Holding shall have the right to override and reverse
                  any vote by the Members made on or before the expiration of
                  the Termination Time so long as Leviathan Holding does not
                  obligate Manta Ray to incur any construction costs;

                           (ii) authorizing any contract, agreement or other
                  undertaking involving more than $500,000 in any year or
                  $1,000,000 in the aggregate;

                           (iii) authorizing a transaction involving the
                  acquisition or construction of any pipeline, lateral or
                  extension, including a Lateral in accordance with Article XV,
                  or any compression, expansion or other significant facilities;

                           (iv) authorizing a transaction involving a lease or
                  similar arrangement which either (A) involves an asset with a
                  fair market value of more than $500,000 or (B) could
                  reasonably be expected to result in payments in excess of
                  $500,000;

                           (v) approving any operating and capital expenditures
                  budgets;

                           (vi) authorizing any transaction, including, without
                  limitation, any purchase, sale, lease or exchange of property
                  or the rendering of any service, involving the Company or its
                  Subsidiaries and any Member or


                                       47
<PAGE>   52

                  any Affiliate of any Member (which transaction, once approved
                  by all of the Members, shall be presumed to be fair to the
                  Company or such Subsidiary, as the case may be);

                           (vii) authorizing borrowing money;

                           (viii) authorizing transactions not in the ordinary
                  course of business;

                           (ix) determining the cash reserve applicable to
                  distributions of cash and other property as provided in
                  Sections 5.3, 5.5 and 5.6;

                           (x) utilizing for other than company purposes,
                  acquiring, or disposing of any material asset of the Company
                  or its Subsidiaries;

                           (xi) permitting a member of the Company or any of its
                  Subsidiaries to resign;

                           (xii) permitting the merger, consolidation,
                  participation in a share exchange or other statutory
                  reorganization with, or sale of all or substantially all of
                  the assets of the Company or its Subsidiaries to, or the sale
                  or other transfer or alienation of any interest in Manta Ray
                  or Nautilus to, any Person;

                           (xiii) permitting dissolution and liquidation;

                           (xiv) approving the Construction Certificate, the
                  Nautilus FERC tariff, the applications for the Construction
                  Certificate, the FERC Certificate and any subsequent FERC
                  certificate, including any amendment or modifications of any
                  FERC certificate, approving any material amendments or other
                  material modifications to the Construction Certificate, the
                  Nautilus FERC tariff, the FERC Certificate or any subsequent
                  FERC certificate, including, without limitation, the general
                  terms and conditions and the rates and the basis upon which
                  such rates are calculated, or accepting the Construction
                  Certificate, the FERC Certificate or any subsequent FERC
                  certificate;

                           (xv) instituting litigation, arbitration, or similar
                  proceedings at a cost to the Company which could reasonably be
                  expected to exceed $250,000; provided, however, that if any
                  Member or any Affiliate of a Member is an adverse party
                  thereto, then all of the remaining Members which are not
                  Affiliates of the affected Member shall be entitled to cause
                  the Company to institute such action, but once action has been
                  instituted, all of such remaining Members must agree prior to
                  the settlement of any such action. Such non-Affiliate Members'
                  vote shall be sufficient to take such actions under this
                  Section even if such Membership Interest is less than a
                  Majority Interest;


                                       48
<PAGE>   53

                           (xvi) changing the name of the Company or its
                  Subsidiaries;

                           (xvii) approval, waiver, amendment or other
                  modification (other than termination) of any Operating
                  Agreement or any other operating agreement with respect to the
                  operation of the Manta Ray System or the Nautilus System or
                  any management or similar agreement with respect to the
                  operation of the Company or Ocean Breeze Pipeline Company,
                  L.L.C.; and

                           (xviii) termination (other than by expiration of the
                  term thereof) of any Operating Agreement or any other
                  operating agreement with respect to the operation of the Manta
                  Ray System or the Nautilus System or of the Company or Ocean
                  Breeze provided, however that for purposes of this Section
                  6.3(b)(xviii), if any Member or its Affiliate (as such term is
                  defined in the Operating Agreement or Construction Agreements
                  in question) which would be replaced as an operator as a
                  result of such termination, such Member shall not be entitled
                  to vote on such termination. The vote of such non-replaced
                  Members shall be sufficient to take such actions under this
                  Section even if such Membership Interest is less than a
                  Majority Interest;


         With respect to each matter described in (i) - (xviii) above, the
exercise of Member authority shall occur only by the affirmative vote of the
applicable Required Interest specified elsewhere in this Agreement, including,
without limitation, the unanimous voting requirements set forth in Section
7.2(b); the Super-Majority Interest voting requirements set forth in Section
7.2(a), and the Majority Interest voting requirements set forth in Section
7.1(a). Member approval or disapproval of any matter requiring Member approval
(including, without limitation, the matters set forth in this Section 6.3(b) and
Sections 7.2(a) and (b)) may be based on any reason whatsoever, in each Member's
sole and absolute discretion.

         6.4 OFFICERS.

                  (a) The Members may designate one or more Persons to fill one
         or more officer positions of the Company. Such officers may include,
         without limitation, Chief Executive Officer, Chief Financial Officer,
         President, Vice President, Treasurer, Assistant Treasurer, Secretary
         and Assistant Secretary. No officer need be a resident of the State of
         Delaware. The Members may assign titles to particular officers. Each
         officer shall hold office until his successor shall be duly designated
         and shall qualify to hold such office, or until his death or until he
         shall resign or shall have been removed in the manner hereinafter
         provided. Any number of offices may be held by the same Person. The
         salaries or other compensation, if any, of the officers and agents of
         the Company may be fixed from time to time by the Members.
         Notwithstanding any other provisions of this Agreement, the authority
         of any officers, employees or agents of the Company shall be restricted
         to the carrying on of the day-to-day affairs of the


                                       49
<PAGE>   54

         Company and any such authority shall be subject to the supervisory
         control of the Members. Only Members or their duly authorized agents
         shall have the authority to make policy decisions for the Company.
         Unless the Members decide otherwise, the assignment of such title shall
         constitute the delegation to such officer of the authority and duties
         set forth below:

                           (i) President. Unless otherwise specified by the
                  Members, the President shall be the chief operating officer of
                  the Company and have general executive powers to manage the
                  operations of the Company, and such other powers and duties
                  under this Agreement as the Members may from time to time
                  prescribe.

                           (ii) Vice Presidents. In the absence of the
                  President, or in the event of his inability to act, the Vice
                  President (or in the event there be more than one Vice
                  President, the Vice Presidents in the order designated by the
                  Members, or in the absence of any such designation, then in
                  the order of their election or appointment) shall perform the
                  duties of the President, and when so acting, shall have all
                  the powers of and be subject to all the restrictions upon the
                  President.

                           (iii) Secretary. The Secretary shall keep the minutes
                  of the meetings of the Company and shall exercise general
                  supervision over the files of the Company. The Secretary shall
                  give notice of meetings and shall perform other duties
                  commonly incident to such office.

                           (iv) Assistant Secretary. At the request of the
                  Secretary or in the Secretary's absence or inability to act,
                  the Assistant Secretary shall perform part or all of the
                  Secretary's duties.

                           (v) Treasurer. The Treasurer shall have general
                  supervision of the funds, securities, notes, drafts,
                  acceptances, and other commercial paper and evidences of
                  indebtedness of the Company and he shall determine that funds
                  belonging to the Company are kept on deposit in such banking
                  institutions as the Members may from time to time direct. The
                  Treasurer shall determine that accurate accounting records are
                  kept, and the Treasurer shall render reports of the same and
                  of the financial condition of the Company to the Members at
                  any time upon request. The Treasurer shall perform other
                  duties commonly incident to such office, including, but not
                  limited to, the execution of tax returns.

                           (vi) Assistant Treasurer. At the request of the
                  Treasurer or in the Treasurer's absence or inability to act,
                  the Assistant Treasurer shall perform part or all of the
                  Treasurer's duties.

                  (b) Any officer may resign as such at any time. Such
         resignation shall be made in writing and shall take effect at the time
         specified therein, or if


                                       50
<PAGE>   55

         no time be specified, at the time of its receipt by the Company. The
         acceptance of a resignation shall not be necessary to make it
         effective, unless expressly so provided in the resignation. Any officer
         may be removed as such, either with or without cause, by the Members;
         provided, however, that such removal shall be without prejudice to the
         contract rights, if any, of the officer so removed. Designation of an
         officer shall not of itself create contract rights. Any vacancy
         occurring in any office of the Company may be filled by the Members.

         6.5 DUTIES OF OFFICERS. Each officer shall devote such time, effort,
and skill to the Company's business affairs as he deems necessary and proper for
the Company's welfare and success. The Members expressly recognize that the
officers have substantial other business relationships and activities with
Persons other than the Company.

         6.6 NO DUTY TO CONSULT. Except as otherwise provided herein or by
applicable law, neither the Company nor its duly appointed agents, designees or
representatives or the officers of the Company shall have a duty or obligation
to consult with or seek advice of the Members on any matter relating to the
day-to-day business affairs of the Company duly delegated to such Persons;
provided, however, that such Persons shall not be restricted from consulting
with or seeking the advice of the Members.

         6.7 REIMBURSEMENT. Except for pre-formation expenses paid by each
respective Member and treated as a Capital Contribution pursuant to Section
4.1(a), all expenses incurred with respect to the organization, operation and
management of the Company shall be borne by the Company.

         6.8 MEMBERS AND AFFILIATES DEALING WITH THE COMPANY. Subject to
obtaining any consent expressly required hereunder, the Company may appoint,
employ, contract, or otherwise deal with any Person, including Affiliates of the
Members, individuals with whom the Members are otherwise related, and with
business entities which have a financial interest in a Member or in which a
Member has a financial interest, for transacting Company business, including any
acts or services for the Company as the members of any committee, officer or
other representative with the proper authority may approve.

         6.9 INSURANCE. Each Member, according to its proportionate share equal
to its Membership Interest, shall make available for its own benefit and the
benefit of the Company, Ocean Breeze, Manta Ray and Nautilus, the insurance
coverages described on "Exhibit C.I" hereto and such other insurance as may be
required by applicable Laws.

         The Company shall provide the applicable insurance coverages described
on "Exhibit C. II and III" for the benefit of the Company, Ocean Breeze, Manta
Ray, Nautilus, Leviathan Holding, Marathon Holding and Shell Holding. The costs
of the insurance coverages described on "Exhibit C.II and III" which are
obtained by the


                                       51
<PAGE>   56

Company (if any) shall automatically be included in the applicable operating
budget for the Company without the necessity of approval by the Members.

         All insurance policies shall provide that the insurers waive their
right of subrogation against the Company, Ocean Breeze, Manta Ray, Nautilus,
Leviathan Holding, Marathon Holding and Shell Holding, any of their Affiliates,
or any other party indemnified by Company.


         The Company shall make available to Ocean Breeze, Nautilus and Manta
Ray the full amount of the Company's insurance program described on "Exhibit
C.I.A." through "D" of this Agreement.


                                  ARTICLE VII.
                                    MEETINGS

         7.1 MEETINGS OF MEMBERS AND COMMITTEES.

                  (a) A quorum shall be present at a meeting of Members or any
         committee of the Company if the holders of at least a Majority Interest
         are represented at the meeting in person or by proxy. At a meeting of
         the Members at which a quorum is present with respect to any matter
         (except for any matter expressly requiring the affirmative vote of a
         Required Interest greater than a Majority Interest pursuant to this
         Agreement), the affirmative vote of the Majority Interest shall be the
         act of the Members.

                  (b) All meetings of the Members or any committee of the
         Company shall be held at the principal place of business of the Company
         or at such other place within or without the State of Delaware as shall
         be specified or fixed in the notices or waivers of notice thereof;
         provided that any or all Members or their representatives may
         participate in any such meeting by means of conference telephone or
         similar communications equipment pursuant to Section 16.11. No Member
         shall willfully be absent from any meeting of the Members or any
         committee of the Company.

                  (c) Notwithstanding the other provisions of this Agreement,
         the holders of at least a majority of the Membership Interest
         represented (in person or by proxy) at a meeting at which a quorum is
         present shall have the power to adjourn such meeting from time to time,
         without any notice other than an announcement at the meeting of the
         time and place of the resumption of the adjourned meeting. The time and
         place of such adjournment shall be determined by a vote of such
         Membership Interest. Upon the resumption of


                                       52
<PAGE>   57

         such adjourned meeting, any business may be transacted that might have
         been transacted at the meeting as originally called.

                  (d) Unless otherwise expressly provided in a written notice
         issued by the Members, an annual meeting of the Members for the
         transaction of such business as may properly come before such meeting
         shall be held at the principal office of the Company at 10:00 a.m. on
         the second Tuesday which is a Business Day in the month of April.
         Regularly scheduled, periodic meetings of the Members or any committee
         of the Company may be held without notice to the Members or Member
         representatives at such times and places as shall from time to time be
         determined by resolution of the Members or such Member representatives
         and communicated to all Members or their representatives. Each Member,
         or its representatives in the case of committee meetings, shall use
         reasonable efforts to inform the other Members or committee
         representatives of any business matters that it intends to raise at any
         regular meeting of the Members or any committee of the Company within a
         reasonable time prior to such meeting.

                  (e) Special meetings of the Members or any committee of the
         Company, for any purpose or purposes, unless otherwise prescribed by
         law, shall be called by (i) the President or Secretary (if any), (ii)
         any one or more Members holding at least 20% of the Membership
         Interests of the Company in the aggregate or (iii) any two or more
         non-Affiliated Members. Such request of the President, Secretary or
         Member(s) shall state the purpose or purposes of the proposed meeting.

                  (f) Except as provided otherwise by this Agreement or
         applicable law, written or printed notice stating the place, day and
         hour of the meeting and the purpose or purposes for which such meeting
         is called, shall be delivered not less than ten (10) nor more than
         sixty (60) days (including Saturdays, Sundays and holidays) before the
         date of the proposed meeting, either personally, by certified mail
         (return receipt requested) or by telecopy (with a copy delivered via
         United States mail), by or at the direction of the Person calling the
         meeting, to each Member or Member representative, as the case may be,
         entitled to vote thereat. If mailed, any such notice shall be deemed to
         be delivered when deposited in the United States mail, addressed to the
         Member, or Member representative, at its address provided for in
         Section 16.19, with postage thereon prepaid.

                  (g) The date on which notice of a meeting of the Members or
         any committee of the Company is mailed shall be the Record Date for the
         determination of the Members or Member representatives entitled to
         notice of or to vote at such meeting, including any adjournment
         thereof, or the Members or Member representatives entitled to receive
         such notice.


                                       53
<PAGE>   58

         7.2 SPECIAL ACTIONS.

                  (a) The approval of the holders of a Super-Majority Interest
         of the Members shall be required to authorize and approve the
         following, or, with respect to matters to be authorized or approved by
         Subsidiaries of the Company, to determine how the Company will vote as
         a member of such Subsidiary with respect to the following:

                           (i) except with respect to cash reserves consistent
                  with historical practices, determining the cash reserves
                  applicable to distributions of cash and other property as
                  provided in Sections 5.3, 5.5 and 5.6, other than (A) cash
                  reserves relating to acquiring, constructing or otherwise
                  obtaining (including, without limitation, pursuant to a lease
                  or similar arrangement approved in accordance with Section
                  7.2(a)(v)) any pipeline, lateral or extension, including any
                  Lateral or any compression, expansion or other significant
                  facilities if such reserve exceeds, at any one time, $500,000,
                  but is less than or equal to $5,000,000 (the authorization for
                  which requires at least a Majority Interest) or (B) cash
                  reserves described in Section 7.2(a)(ii) (requiring at least a
                  Super Majority Interest) or Section 7.2(b)(xv) (requiring
                  unanimity);

                           (ii) determining the cash reserves applicable to
                  distributions of cash and other property as provided in
                  Sections 5.3, 5.5 and 5.6, to the extent such cash reserves
                  (A) relate to acquiring, constructing, leasing or otherwise
                  obtaining any pipeline, lateral or extension, including any
                  Lateral or any compression, expansion or other significant
                  facilities and (B) exceed, at any one time, $5,000,000, but is
                  less than or equal to $15,000,000;

                           (iii) (A) entering into any credit agreement,
                  indenture or similar agreement or (B) borrowing money or
                  making draws under any such previously approved credit
                  agreement, indenture or similar agreement for the purpose of
                  funding authorized transactions with an approved cost to the
                  Company of more than $5,000,000, but less than or equal to
                  $15,000,000;

                           (iv) utilizing other than for Company purposes,
                  acquiring or disposing of any asset of the Company or its
                  Subsidiaries having a then existing fair market value or GAAP
                  net book value (after deducting accumulated depreciation,
                  depletion, amortization and impairment) of more than
                  $5,000,000 but less than or equal to $15,000,000;

                           (v) authorizing a transaction involving a lease or
                  similar arrangement which either (A) involves an asset with a
                  fair market value of more than $5,000,000 but less than or
                  equal to $15,000,000 or (B) could reasonably be expected to
                  result in payments of more than $5,000,000 but less than or
                  equal to $15,000,000;


                                       54
<PAGE>   59

                           (vi) authorizing a transaction which involves
                  acquiring, constructing or otherwise obtaining any pipeline,
                  lateral or extension, including any Lateral, or any
                  compression, expansion or other significant facilities, which
                  could reasonably be expected to have a cost to the Company or
                  any Subsidiary of more than $5,000,000 but less than or equal
                  to $15,000,000.

                  (b) The approval of the holders of all of the Membership
         Interest of the Members shall be required to authorize and approve the
         following, or, with respect to matters to be authorized or approved by
         Subsidiaries of the Company, to determine how the Company will vote as
         a member of such Subsidiary with respect to the following:

                           (i) approving the Nautilus FERC tariff, the
                  applications for the FERC Certificate or any subsequent FERC
                  certificate, including any amendment or modifications of any
                  FERC certificate and approving any material amendments or
                  other material modifications to the Nautilus FERC tariff, the
                  FERC Certificate or any subsequent FERC certificate,
                  including, without limitation, the general terms and
                  conditions and the rates and the basis upon which such rates
                  are calculated;

                           (ii) accepting the Construction Certificate (which
                  approval shall also be deemed to be an approval of the FERC
                  Certificate, unless, at the time Nautilus receives the FERC
                  Certificate, all of the Members agree that such FERC
                  Certificate should be rejected);

                           (iii) approval, waiver, amendment or other
                  modification (other than termination) of any Construction
                  Agreement or Operating Agreement or any other operating
                  agreement with respect to the operation of the Manta Ray
                  System or the Nautilus System;

                           (iv) termination (other than by expiration of the
                  term thereof) of any Construction Agreement or Operating
                  Agreement or any other operating agreement with respect to the
                  operation of the Manta Ray System or the Nautilus System or of
                  the Company or Ocean Breeze; provided, however that for
                  purposes of this Section 7.2(b)(iv), if any Member or its
                  Affiliate (as such term is defined in the Operating Agreement
                  or Construction Agreement in question) would be replaced as an
                  operator as a result of such termination, such Member shall
                  not be entitled to vote on such termination. The vote of such
                  Members not terminated shall be sufficient to take such
                  actions under this Section even if such Membership Interest is
                  less than a Majority Interest;

                           (v) changing the name of the Company or any of its
                  Subsidiaries;



                                       55
<PAGE>   60

                           (vi) instituting litigation, arbitration, or similar
                  proceedings against Persons other than any Member or any
                  Affiliate of any Member at a cost to the Company which could
                  reasonably be expected to exceed $250,000;

                           (vii) making draws under any credit agreement,
                  indenture or similar agreement approved in accordance with the
                  terms of Section 7.2(a)(iii)(A), for the purpose of funding
                  authorized transactions with an approved cost to the Company
                  of more than $15,000,000;

                           (viii) utilizing other than for company purposes,
                  acquiring or disposing of any asset of the Company or its
                  Subsidiaries, having a then existing fair market value or GAAP
                  net book value (after deducting accumulated depreciation,
                  depletion, amortization and impairment) of more than
                  $15,000,000;

                           (ix) authorizing a transaction which involves
                  acquiring, constructing or otherwise obtaining any pipeline,
                  lateral or extension, including any Lateral, or any
                  compression, expansion or other significant facilities, which
                  could reasonably be expected to have a cost to the Company or
                  any Subsidiary of more than $15,000,000;

                           (x) authorizing a transaction involving a lease or
                  similar arrangement which either (A) involves an asset with a
                  fair market value of more than $15,000,000 or (B) could
                  reasonably be expected to result in payments of more than
                  $15,000,000;

                           (xi) authorizing any transaction or any amendment
                  thereto, including, without limitation, any purchase, sale,
                  lease or exchange of property or the rendering of any service
                  involving the Company or any of its Subsidiaries and any
                  Member or any Affiliate of any Member (which transaction, once
                  approved by all of the Members, shall be presumed to be fair
                  to the Company); and

                           (xii) authorizing material transactions the nature of
                  which are not in the ordinary course of business;

                           (xiii) permitting the merger, consolidation, or
                  participation in a share exchange or other statutory
                  reorganization with, or sale of all or substantially all of
                  the assets of Manta Ray, Nautilus or the Company to, or the
                  sale or other transfer or alienation (other than granting a
                  lien or other Security Interests) of any interest in Manta Ray
                  or Nautilus to, any Person;


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<PAGE>   61

                           (xiv) approving the operating and capital expenditure
                  budgets of the Company or any of its Subsidiaries covering the
                  period from the date hereof until the first anniversary of
                  such date;

                           (xv) approving any cash reserve applicable to
                  distributions of cash and other property as provided in
                  Sections 5.3, 5.5 and 5.6, to the extent such cash reserve (A)
                  relates to acquiring, constructing or otherwise obtaining
                  (including, without limitation, pursuant to a lease or similar
                  arrangement approved in accordance with Section 7.2(b)(x)) any
                  pipeline, lateral or extension, including any Lateral, or any
                  compression, expansion or other significant facilities and (B)
                  exceeds, at any one time, $15,000,000;

                           (xvi) hiring any employees of the Company;

                           (xvii) admitting any new Member to any Subsidiary of
                  the Company; and

                           (xviii) actions for which this Agreement otherwise
                  expressly requires unanimous approval, including, without
                  limitation, any of the actions set forth in Sections 3.10
                  (creation of additional Membership Interests), 3.14
                  (Resignation), 4.2 (subsequent Capital Contributions), 5.6
                  (distribution of Initial Capital Contributions), 12.1(a)
                  (Dissolution and Liquidation) and 13.2 (Amendments).

         7.3 VOTING LIST. The officer of the Company or the designated Member
who is responsible for the maintenance of the Company's records shall make, at
least ten days before each meeting of Members, a complete list of the Members or
their representatives, as the case may be, entitled to vote thereat or any
adjournment thereof, arranged in alphabetical order, with the address of and the
Membership Interest held or represented by each, which list, for a period of ten
days prior to such meeting, shall be kept on file at the registered office or
principal place of business of the Company and shall be subject to inspection by
any Member or Member representative at any time during usual business hours.
Such list shall also be produced and kept open at the time and place of the
meeting and shall be subject to the inspection of any Member or Member
representative during the whole time of the meeting. The original Company
records shall be prima facie evidence as to who are the Members or their
representatives entitled to examine such list or transfer records or to vote at
any meeting of Members. Failure to comply with the requirements of this Section
shall not affect the validity of any action taken at the meeting.

         7.4 PROXIES. A Member or Member representative may vote either in
person or by proxy executed in writing by the Member or Member representative. A
telegram, telex, cablegram or similar transmission by the Member or Member
representative or a photographic, photostatic, facsimile or similar reproduction
of writing executed by the Member or Member representative shall be treated as
an execution in writing for


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<PAGE>   62

purposes of this Section. Proxies for use at any meeting of the Members or
committee of the Company or in connection with the taking of any action by
written consent shall be filed with the Company before or at the time of the
meeting or execution of the written consent, as the case may be. All proxies
shall be received and taken charge of and all ballots shall be received and
canvassed by an inspector or inspectors appointed by the President or a Vice
President of the Company who shall decide all questions touching upon the
qualification of voters, the validity of the proxies, and the acceptance or
rejection of votes.

         7.5 VOTES. Each Member or Member representative shall be entitled to
one vote (or a fraction thereof) per percent (or fraction thereof) of Membership
Interest held by such Member, as reflected in the transfer records of the
Company; provided, however, that for purposes of determining a quorum or a
Required Interest the Membership Interest of any Member shall not be counted and
such interest shall be apportioned by interest among the remaining Members as
applicable if the Member is not permitted to vote under this Agreement for any
reason, including, without limitation, the relevant Member is in Default, is not
deemed to be a Substituted Member or is in breach of certain representations and
warranties; provided, however, that no Member shall be required to make any
Capital Contribution, other than an Initial Capital Contribution, if such Member
did not vote to approve such Capital Contribution in accordance with Section
4.2.

         7.6 CONDUCT OF MEETINGS. All meetings of the Members or committees of
the Company shall be presided over by the chairman of the meeting, who shall be
designated by, in order of priority, the President, the Vice President or other
appropriate officer of the Company. The chairman of any meeting of Members or
committee of the Company shall determine the order of business and the procedure
at the meeting, including regulation of the manner of voting and the conduct of
discussion.

         7.7 ACTION BY WRITTEN CONSENT.

                  (a) Except as otherwise provided by applicable Laws, any
         action required or permitted to be taken at any meeting of Members or
         committee of the Company may be taken without a meeting, and without a
         vote, if a consent or consents in writing, setting forth the action so
         taken, shall be signed by the holder or holders or representatives of
         not less than the minimum of Membership Interests that would be
         necessary to take such action at a meeting at which the holders of all
         Membership Interests entitled to vote on the action were present and
         voted; provided, however, that no such written consent shall be
         effective unless each Member has been provided with at least 3 Business
         Days prior written notice of such consent to be sought or has waived
         the requirement of such notice. To the extent required by law, every
         written consent shall bear the date of signature of each Member or
         Member representative who signs the consent. To the extent required by
         law, no written consent shall be effective to take the action that is
         the subject of such consent unless, within 60 days after the date of
         the earliest dated consent delivered to the


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<PAGE>   63

         Company in the manner required by this Section 7.7, a consent or
         consents signed by the holder or holders of not less than the minimum
         Membership Interests that would be necessary to take the action that is
         the subject of the consent are delivered to the Company by delivery to
         its registered office or its principal place of business. Delivery
         shall be by hand or certified or registered mail (return receipt
         requested) to the Company's principal place of business and shall be
         addressed to the Secretary of the Company. A telegram, telex, cablegram
         or similar transmission by a Member or Member representative, or a
         photographic, photostatic, facsimile or similar reproduction of a
         writing signed by a Member or Member representative, shall be regarded
         as signed by the Member or Member representative for purposes of this
         Section 7.7. In addition to the prior written notice described above,
         prompt written notice of the taking of any action by the Members or
         committees of the Company without a meeting by less than unanimous
         written consent shall be given to those Members or Member
         representatives who did not consent in writing to the action.

                  (b) The Record Date for determining Members or their
         representatives entitled to consent to an action in writing without a
         meeting shall be the first date on which a signed written consent
         setting forth the action taken or proposed to be taken is delivered to
         the Company. Delivery of such written consent shall be by hand or by
         certified or registered mail (return receipt requested) to the
         Company's principal place of business and shall be addressed to the
         Secretary of the Company.

         7.8 RECORDS. An officer of the Company or a designated Member
representative shall be responsible for maintaining the records of the Company,
including keeping minutes at the meetings of the Members or committees of the
Company and the filing of consents in the records of the Company.

                                 ARTICLE VIII.

                                 INDEMNIFICATION

         8.1 RIGHT TO INDEMNIFICATION. Subject to the limitations and conditions
as provided herein or by applicable Laws, each Person who was or is made a party
or is threatened to be made a party to or is involved in any threatened, pending
or completed action, suit or proceeding, whether civil, criminal,
administrative, arbitrative or investigative (hereinafter a "Proceeding"), or
any appeal in such a Proceeding or any inquiry or investigation that could lead
to such a Proceeding, by reason of the fact that he or she, or a Person of whom
he or she is the legal representative, is or was a Member of the Company, a
member of a committee of the Company or an officer of the Company, or while such
a Person is or was serving at the request of the Company as a director, officer,
partner, venturer, member, trustee, employee, agent or similar functionary of
another foreign or domestic general partnership, corporation, limited
partnership, joint venture, limited liability company, trust, employee benefit
plan or other enterprise, shall be indemnified by the Company to the extent such
Proceeding or


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<PAGE>   64

other above-described process relates to any such above-described relationships
with, status with respect to, or representation of any such Person to the
fullest extent permitted by the Act, as the same exists or may hereafter be
amended (but, in the case of any such amendment, only to the extent that such
amendment permits the Company to provide broader indemnification rights than
said Laws permitted the Company to provide prior to such amendment) against
judgments, penalties (including excise and similar taxes and punitive damages),
fines, settlements and reasonable expenses (including, without limitation,
attorneys' fees) actually incurred by such Person in connection with such
Proceeding, and indemnification under this Article VIII shall continue as to a
Person who has ceased to serve in the capacity which initially entitled such
Person to indemnity hereunder for any and all liabilities and damages related to
and arising from such Person's activities while acting in such capacity;
provided, however, that no Person shall be entitled to indemnification under
this Section 8.1 in the event the Proceeding involves acts or omissions of such
Person which constitute an intentional breach of this Agreement or gross
negligence or willful misconduct on the part of such Person. The rights granted
pursuant to this Article VIII shall be deemed contract rights, and no amendment,
modification or repeal of this Article VIII shall have the effect of limiting or
denying any such rights with respect to actions taken or Proceedings arising
prior to any such amendment, modification or repeal. It is expressly
acknowledged that the indemnification provided in this Article VIII could
involve indemnification for negligence or under theories of strict liability.

         8.2 INDEMNIFICATION OF OFFICERS, EMPLOYEES AND AGENTS. The Company may
indemnify, and advance expenses to, Persons who are not or were not a Member,
including officers, employees or agents of the Company, and those Persons who
are or were serving at the request of the Company as a manager, director,
officer, partner, venturer, member, trustee, employee, agent or similar
functionary of another foreign or domestic general partnership, corporation,
limited partnership, joint venture, limited liability company, trust, employee
benefit plan or other enterprise against any liability asserted against such
Person and incurred by such Person in such a capacity or arising out of his
status as such a Person to the same extent that it may indemnify and advance
expenses to a Member under this Article VIII.

         8.3 ADVANCE PAYMENT. Any right to indemnification conferred in this
Article VIII shall include a limited right to be paid or reimbursed by the
Company for any and all reasonable expenses as they are incurred by a Person
entitled to be indemnified under Sections 8.1 and 8.2 who was, or is threatened,
to be made a named defendant or respondent in a Proceeding in advance of the
final disposition of the Proceeding and without any determination as to such
Person's ultimate entitlement to indemnification; provided, however, that the
payment of such expenses incurred by any such Person in advance of final
disposition of a Proceeding shall be made only upon delivery to the Company of a
written affirmation by such Person of his good faith belief that he has met the
requirements necessary for indemnification under this Article VIII and a written
undertaking, by or on behalf of such Person, to repay all amounts so advanced if
it shall ultimately be determined that such indemnified Person is not entitled
to be indemnified under this Article VIII or otherwise.


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<PAGE>   65

         8.4 APPEARANCE AS A WITNESS. Notwithstanding any other provision of
this Article VIII, the Company may pay or reimburse expenses incurred by any
Person entitled to be indemnified pursuant to this Article VIII in connection
with such Person's appearance as a witness or other participation in a
Proceeding at a time when he is not a named defendant or respondent in the
Proceeding.

         8.5 NONEXCLUSIVITY OF RIGHTS. The right to indemnification and the
advancement and payment of expenses conferred in this Article VIII shall not be
exclusive of any other right which a Person indemnified pursuant to Sections 8.1
and 8.2 may have or hereafter acquire under any Laws, this Agreement, or any
other agreement, vote of Members or otherwise.

         8.6 INSURANCE. The Company may purchase and maintain indemnification
insurance, at its expense, to protect itself and any Person from any expenses,
liabilities, or losses that may be indemnified under this Article VIII.

         8.7 MEMBER NOTIFICATION. Any indemnification of or advance of expenses
to any Person entitled to be indemnified under this Article VIII shall be
reported in writing to the Members with or before the notice or waiver of notice
of the next Members' meeting or with or before the next submission to Members of
a consent to action without a meeting and, in any case, within the 12 month
period immediately following the date the indemnification or advance was made.

         8.8 SAVINGS CLAUSE. If this Article VIII or any portion hereof shall be
invalidated on any ground by any court of competent jurisdiction, then the
Company shall nevertheless indemnify and hold harmless any Person entitled to be
indemnified pursuant to this Article VIII as to costs, charges and expenses
(including attorneys' fees), judgments, fines and amounts paid in settlement
with respect to any action, suit or proceeding, whether civil, criminal,
administrative or investigative to the full extent permitted by any applicable
portion of this Article VIII that shall not have been invalidated and to the
fullest extent permitted by applicable Laws.

         8.9 SCOPE OF INDEMNITY. For the purposes of this Article VIII,
references to the "Company" include all constituent entities, whether
corporations or otherwise, absorbed in a consolidation or merger as well as the
resulting or surviving entity. Thus, any Person entitled to be indemnified or
receive advances under this Article VIII shall stand in the same position under
the provisions of this Article VIII with respect to the resulting or surviving
entity as he would have if such merger, consolidation, or other reorganization
never occurred.

                                  ARTICLE IX.
                                      TAXES

         9.1 TAX RETURNS. The Company shall cause to be prepared and filed all
necessary federal and state income tax returns for the Company, including making
the elections described in Section 9.2. Upon written request by the Company,
each


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<PAGE>   66

Member shall furnish to the Company all pertinent information in its possession
relating to Company operations that is necessary to enable the Company's income
tax returns to be prepared and filed.

         9.2 TAX ELECTIONS. The Company shall make the following elections on
the appropriate tax returns:

                  (a) to adopt the accrual method of accounting;

                  (b) an election pursuant to section 754 of the Code;

                  (c) to elect to amortize the organizational expenses of the
         Company and the start-up expenditures of the Company under section 195
         of the Code ratably over a period of 60 months as permitted by section
         709(b) of the Code; and

                  (d) any other election that the Company may deem appropriate
         and in the best interests of the Company or Members, as the case may
         be.

         Neither the Company nor any Member may make an election for the Company
to be excluded from the application of the provisions of subchapter K of chapter
1 of subtitle A of the Code or any similar provisions of applicable state law,
and no provision of this Agreement shall be construed to sanction or approve
such an election.

         9.3 TAX MATTERS MEMBER. The Company shall select one of the Members as
the "Tax Matters Member" of the Company pursuant to section 6231(a)(7) of the
Code. The Tax Matters Member shall take such action as may be necessary to cause
each Member to become a "notice partner" within the meaning of section 6223 of
the Code and shall inform each Member of all significant matters that may come
to its attention in its capacity as Tax Matters Member by giving notice thereof
on or before the fifth Business Day after becoming aware thereof and, within
that time, shall forward to each other Member copies of all significant written
communications it may receive in that capacity. The Tax Matters Member may not
take any action contemplated by sections 6222 through 6232 of the Code without
the consent of a Majority Interest, but this sentence does not authorize the Tax
Matters Member to take any action left to the determination of an individual
Member under sections 6222 through 6232 of the Code. The initial Tax Matters
Member shall be the Member so indicated on Exhibit A.

                                   ARTICLE X.
                   BOOKS, RECORDS, REPORTS, AND BANK ACCOUNTS

         10.1 MAINTENANCE OF BOOKS. The Company shall keep books and records of
accounts and shall keep minutes of the proceedings of its Members. The books of
account for the Company shall be maintained on an accrual basis in accordance
with the terms of this Agreement and GAAP, except that the Capital Accounts of
the


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Members shall be maintained in accordance with Section 4.5. The accounting year
of the Company shall be determined by the Company. The initial custodian of the
company records shall be the Tax Matters Members.

         10.2 FINANCIAL STATEMENTS. On or before the last day of each calendar
month during the existence of the Company, the Company shall cause each Member
to be furnished with an income statement for the calendar month immediately
preceding such calendar month. On or before the last day of each January, April,
July and October during the existence of the Company, the Company shall cause
each Member to be furnished with a balance sheet and a statement of cash flows
for, or as of the end of, the fiscal quarter immediately preceding such calendar
month. On or before the last day of each April during the existence of the
Company, the Company shall cause each Member to be furnished with audited
financial statements, including, a balance sheet, an income statement, a
statement of cash flows, and a statement of changes in each Member's Capital
Account for the immediately preceding calendar year. Annual financial statements
must be prepared in accordance with GAAP. The Company also may cause to be
prepared or delivered such other reports as it may deem, in its sole judgment,
appropriate. The Company shall bear the costs of all such reports and financial
statements.

         10.3 TAX STATEMENTS. On or before the last day of July during the
existence of the Company, the Company shall cause each Member to be furnished
with all information reasonably necessary or appropriate to file their
appropriate tax reports, including a schedule of Company book-tax differences
for, or as of the end of, the immediately preceding tax year. In addition, to
the extent reasonably possible, the Company will cause each Member to be
provided with estimates of all such information on or before the first day of
February each year.

         10.4 ACCOUNTS. The officers or designated Members of the Company shall
establish and maintain one or more separate bank and investment accounts and
arrangements for Company funds in the Company's name with financial institutions
and firms that officers or designated Members of the Company may determine. The
Company may not commingle the Company's funds with the funds of any other
Person. All such accounts shall be and remain the property of the Company and
all funds shall be received, held and disbursed for the purposes specified in
this Agreement. The officers or designated Members of the Company may invest the
Company funds only in (i) readily marketable securities issued by the United
States or any agency or instrumentality thereof and backed by the full faith and
credit of the United States maturing within three months or less from the date
of acquisition, (ii) readily marketable securities issued by any state or
municipality within the United States of America or any political subdivision,
agency or instrumentality thereof, maturing within three months or less from the
date of acquisition and rated "A" or better by any recognized rating agency,
(iii) readily marketable commercial paper rated "Prime 1" by Moody's or "A 1" by
Standard and Poor's (or comparably rated by such organizations or any successors
thereto if the rating system is changed or there are such successors) and
maturing in not more than three months after the date of acquisition or (iv)
certificates


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of deposit or time deposits issued by any incorporated bank organized and doing
business under the Laws of the United States of America which is rated at least
"A" or "A2" by Standard and Poor's or Moody's, which is not in excess of
federally insured amounts, and which matures within three months or less from
the date of acquisition.

                                  ARTICLE XI.
                             BANKRUPTCY OF A MEMBER

         11.1 BANKRUPT MEMBERS. If any Member becomes a Bankrupt Member, the
Company, by approval of at least a majority in interest of the Members excluding
any Bankrupt Member or, if the Company does not exercise the relevant option,
the non-Bankrupt Members which desire to participate, shall have the option,
exercisable by notice from the Company or the Members, as the case may be, to
the Bankrupt Member (or its representative) at any time prior to the 180th day
after receipt of notice of the occurrence of the event causing it to become a
Bankrupt Member, to buy, and, on the exercise of this option, the Bankrupt
Member or its representative shall sell, its Membership Interest. The purchase
price shall be an amount equal to the fair market value thereof determined by
agreement by the Bankrupt Member (or its representative) and the potential
purchaser; however, if those Persons do not agree on the fair market value on or
before the 90th day following the date of receipt by such potential purchaser of
notice of the occurrence of the event causing the Member to become a Bankrupt
Member, either such Person, by written notice to the other, may require the
determination of fair market value to be made by an independent appraiser
specified in such notice. If the Person receiving that notice objects on or
before the tenth day following receipt to the independent appraiser designated
in that notice, and those Persons otherwise fail to agree on an independent
appraiser, either such Person may petition the United States District Judge for
the Southern District of Texas then senior in active service to designate an
independent appraiser, whose determination of the independent appraiser, however
designated, is final and binding on all parties. The Bankrupt Member and the
potential purchaser each shall pay one-half of the costs of the appraisal and
court costs in appointing an appraiser (if any). If the potential purchaser then
elects, within ten days after the fair market value has been decided by
agreement or by an independent appraiser, to exercise the purchase option, the
purchasing Person shall pay the fair market value as so determined in cash on
closing. The payment to be made to the Bankrupt Member or its representative
pursuant to this Section 11.1 is in complete liquidation and satisfaction of all
the rights and interest of the Bankrupt Member and its representative (and of
all Persons claiming by, through, or under the Bankrupt Member and its
representative) in and in respect of the Company, including, without limitation,
any Membership Interest, any rights in specific Company property, and any rights
against the Company and its officers, agents, and representatives and (insofar
as the affairs of the Company are concerned) against the Members.


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                                  ARTICLE XII.
                    DISSOLUTION, LIQUIDATION, AND TERMINATION

         12.1 DISSOLUTION. Subject to the provisions of Section 12.2 and any
applicable Laws, the Company shall dissolve and its affairs shall be wound up on
the first to occur of the following:

                  (a) the consent of all of the Membership Interests or as
         expressly provided in Section 3.17 and Section 3.18;

                  (b) the expiration of the period fixed for the duration of the
         Company as set forth in this Agreement;

                  (c) entry of a decree of judicial dissolution of the Company
         under section 18-802 of the Act in accordance with Section 16.8; and

                  (d) the bankruptcy or dissolution of a Member or other event
         described in section 18-801 of the Act (other than a Transfer of
         Membership Interest in accordance with the terms of this Agreement).

         12.2 LIQUIDATION AND TERMINATION. Subject to Section 7.5 and Section
12.2(d), and except as expressly provided for to the contrary in Section 3.17
and Section 3.18, upon dissolution of the Company, a representative of the
Company selected by a Majority Interest (not including any Member in Default at
the time of dissolution) shall act as a liquidator or may appoint one or more
Members as liquidator ("Liquidator"). The Liquidator shall proceed diligently to
wind up the affairs of the Company and make final distributions as provided
herein and in the Act. The costs of liquidation shall be borne as a Company
expense. Until final distribution, the Liquidator shall continue to operate the
Company properties for a reasonable period of time to allow for the sale of all
or a part of the assets thereof with all of the power and authority of the
Members. The steps to be accomplished by the Liquidator are as follows:

                  (a) as promptly as possible after dissolution and again after
         final liquidation, the Liquidator shall cause a proper accounting to be
         made of the Company's assets, liabilities, and operations through the
         last day of the calendar month in which the dissolution occurs or the
         final liquidation is completed, as applicable;

                  (b) the Liquidator shall cause any notices required by law to
         be mailed to each known creditor of and claimant against the Company in
         the manner described by such law;

                  (c) subject to the terms and conditions of this Agreement and
         the Act (especially section 18-803), the Liquidator shall distribute
         the assets of the Company in the following order:


                                       65
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                           (i) the Liquidator shall pay, satisfy or discharge
                  from Company funds all of the debts, liabilities and
                  obligations of the Company, including, without limitation, all
                  expenses incurred in liquidation or otherwise make adequate
                  provision for payment and discharge thereof (including,
                  without limitation, the establishment of a cash escrow fund
                  for contingent liabilities in such amount and for such term as
                  the Liquidator may reasonably determine); provided, however,
                  such payments shall not include any Capital Contributions
                  described in Article IV or any other obligations in favor of
                  the Members created by this Agreement other than a loan made
                  pursuant to any provision other than Section 15.2; and

                           (ii) all remaining assets of the Company shall be
                  distributed to the Members as follows:

                                    (A) the Liquidator may sell any or all
                           Company property, including to one or more of the
                           Members (other than any Member in Default at the time
                           of dissolution), provided (x) any such sale to a
                           Member is made on an arms length basis under terms
                           which are in the best interest of the Company and (y)
                           to the extent that any Member has participated in an
                           Expansion Option under Section 15.2(b), the
                           Liquidator shall hire an independent consultant to
                           attribute (on the basis of the then existing fair
                           market value) the proceeds from the sale of the
                           Company property between each respective Major
                           Expansion Project, and all other assets of the
                           Company (such value for each respective Major
                           Expansion Project the "Expansion Liquidation Value")
                           and the Liquidator shall repay any Members' Expansion
                           Option loan pursuant to Section 15.2(e), but only to
                           the extent that there is any Expansion Liquidation
                           Value allocated to the corresponding Major Expansion
                           Project;

                                    (B) with respect to all Company property
                           that has not been sold, the fair market value of that
                           property (as determined by the Liquidator using any
                           method of valuation as it, using its best judgment,
                           deems reasonable) shall be determined and the Capital
                           Accounts of the Members shall be adjusted to reflect
                           the manner in which the unrealized income, gain,
                           loss, and deduction inherent in property that has not
                           been reflected in the Capital Accounts previously
                           would be allocated among the Members if there were a
                           taxable disposition of that property for the fair
                           market value of that property on the date of
                           distribution; and

                                    (C) Company property shall be distributed
                           among the Members ratably in proportion to each
                           Member's Capital Account balances, as determined
                           after taking into account all Capital


                                       66
<PAGE>   71

                           Account adjustments for the taxable year of the
                           Company during which the liquidation of the Company
                           occurs (other than those made by reason of this
                           clause (C));

                  All distributions in kind to the Members shall be made subject
to the liability of each distributee for costs, expenses, and liabilities
theretofore incurred or for which the Company has committed prior to the date of
termination and those costs, expenses, and liabilities shall be allocated to the
distributee pursuant to this Section 12.2. The distribution of cash and/or
property to a Member in accordance with the provisions of this Section 12.2
constitutes a complete return to the Member of its Capital Contributions and a
complete distribution to the Member of its Membership Interest and all the
Company's property.

                  (d) Upon dissolution of the Company upon an event occurring to
         a Member (the "Withdrawing Member") described in Section 12.1(d), then
         within 30 days after the Company delivers notice of such event to the
         Members, at least 50% of such other Members (by Membership Interest and
         excluding the Membership Interest of the Withdrawing Member) may elect
         to reconstitute the Company and continue its business on the same terms
         and conditions set forth in this Agreement by forming a new company on
         terms identical to those set forth in this Agreement and, as necessary,
         admitting an additional Member chosen by such other Members. Such
         non-Withdrawing Members shall be deemed to have voted for and consented
         to such reconstitution unless a written statement objecting to the
         reconstitution shall have been received by the Company within 30 days
         after notice of dissolution was made to such Member. Upon any such
         election to reconstitute by at least 50% of such other Members (by
         Membership Interest), all Members and their successors shall be bound
         thereby and shall be deemed to have approved thereof. Unless such an
         election to reconstitute is made within the applicable time period as
         set forth above, the Company shall conduct only activities necessary to
         wind up its affairs. If such an election is so made, then:

                           (i) the reconstituted Company shall continue until
                  the end of the term set forth in Section 2.6 unless earlier
                  dissolved in accordance with this Article XII; and

                           (ii) the interest of the Withdrawing Member shall be
                  treated thenceforth as the interest of a Transferee that has
                  not been admitted as a Substitute Member hereunder.

         12.3 PROVISION FOR CONTINGENT CLAIMS.

                  (a) The Liquidator shall make a reasonable provision to pay
         all claims and obligations, including all contingent, conditional or
         unmatured claims and obligations, actually known to the Company but for
         which the identity of the claimant is unknown; and


                                       67
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                  (b) If there are insufficient assets to both pay the creditors
         pursuant to Section 12.2(c)(i) and to establish the provision
         contemplated by Section 12.3(a), the claims shall be paid as provided
         for in accordance to their priority, and, among claims of equal
         priority, ratably to the extent of assets therefor.

         12.4 DEFICIT CAPITAL ACCOUNTS. Notwithstanding anything to the contrary
contained in this Agreement, and notwithstanding any custom or rule of law to
the contrary, to the extent that the deficit, if any, in the Capital Account of
any Member results from or is attributable to deductions and losses of the
Company (including non-cash items such as depreciation), or distributions of
money pursuant to this Agreement to all Members ratably in proportion to their
respective Membership Interests, upon dissolution of the Company such deficit
shall not be an asset of the Company and such Members shall not be obligated to
contribute any amounts to the Company to bring the balance of such Member's
capital account to zero.

                                 ARTICLE XIII.
                           AMENDMENT OF THE AGREEMENT

         13.1 AMENDMENTS TO BE ADOPTED BY THE COMPANY. Each Member agrees that
the appropriate officer of the Company, in accordance with and subject to the
limitations contained in Article VII, may execute, swear to, acknowledge,
deliver, file and record whatever documents may be required to reflect:

                  (a) a change in the name of the Company, the location of the
         principal place of business of the Company or the registered agent or
         office of the Company;

                  (b) admission or substitution of Members effected in
         accordance with this Agreement;

                  (c) a change that the Members believe is reasonable and
         necessary or appropriate to qualify or continue the qualification of
         the Company as a limited liability company under the Laws of any state
         or that is necessary or advisable in the opinion of the Company to
         ensure that the Company will not be taxable as a corporation or
         otherwise taxed as an entity for federal income tax purposes;

                  (d) a change that is necessary or appropriate for the Company
         to satisfy any requirements, conditions, guidelines or interpretations
         contained in any opinion, interpretative release, directive, order,
         ruling or regulation of any federal or state agency or judicial
         authority (including, without limitation, the Act);

                  (e) an amendment that is necessary, in the opinion of counsel,
         to prevent the Company or its officers from in any manner being
         subjected to the provisions of the Investment Company Act of 1940, as
         amended, or "plan asset"


                                       68
<PAGE>   73

         regulations adopted under the Employee Retirement Income Security Act
         of 1974, as amended, whether or not substantially similar to plan asset
         regulations currently applied or proposed by the United States
         Department of Labor; and

                  (f) subject to the terms of Section 3.10, an amendment that
         the Company determines in its sole discretion to be necessary or
         appropriate in connection with the authorization for issuance of any
         Membership Interest pursuant to Section 3.10.

         13.2 AMENDMENT PROCEDURES. Except as provided in Section 13.1, all
amendments to this Agreement shall be made in accordance with the following
requirements. Amendments to this Agreement may be proposed by any Member. Each
such proposal shall contain the text of the proposed amendment. If an amendment
is proposed, the Company shall seek the written approval of the holders of the
requisite percentage of Membership Interests or call a meeting of the Members to
consider and vote on such proposed amendment. A proposed amendment shall be
effective upon its approval by the holders of all of the Membership Interests,
unless a different percentage is expressly required under this Agreement. Any
amendment that would materially and adversely affect the rights of any type or
class of Membership Interests in relation to other types or classes of
Membership Interests requires the approval of the holders of at least a majority
of the Membership Interests of such class or type of Membership Interest. The
Company shall notify all Record Holders upon final adoption of any proposed
amendment.

                                  ARTICLE XIV.
                        CERTIFICATED MEMBERSHIP INTERESTS

         14.1 ENTITLEMENT TO CERTIFICATES. Every owner of a Membership Interest
in the Company, unless and to the extent the Company elects otherwise, shall be
entitled to have a certificate, in such form as is approved by the Company and
conforms with applicable law, certifying the Membership Interest owned by it.

         14.2 MULTIPLE CLASSES OF INTEREST. If the Company shall be authorized
to issue more than one class of Membership Interest or more than one series of
any Membership Interest, a statement of the powers, designations, preferences
and relative, participating, optional or other special rights of each class of
membership interest or series thereof and the qualification, limitations or
restrictions of such preferences and/or rights shall, unless the Members shall
by resolution provide that such class or series of Membership Interest shall be
uncertificated, be set forth in full or summarized on the face or back of the
certificate which the Company shall issue to represent such class or series of
Membership Interest; provided that, to the extent allowed by law, in lieu of
such statement, the face or back of such certificate may state that the Company
will furnish a copy of such statement without charge to each requesting Member.

         14.3 SIGNATURES. Each certificate representing a Membership Interest in
the Company shall be signed by or in the name of the Company by (1) the
President or any

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<PAGE>   74

Vice President of the Company and (2) the Treasurer, any Assistant Treasurer,
the Secretary or any Assistant Secretary of the Company. The signature of the
officers of the Company may be facsimiles. In case any officer who has signed or
whose facsimile signature has been placed upon a certificate shall have ceased
to hold such office before such certificate is issued, it may be issued by the
Company with the same effect as if he held such office on the date of issue.

         14.4 ISSUANCE AND PAYMENT. Subject to the provisions of the Act and
this Agreement, including, without limitation, Section 3.10, Membership
Interests may be issued for such consideration and to such persons as the
Company may determine from time to time.

         14.5 RESTRICTIVE LEGEND. In the absence of a more restrictive legend,
all certificates which evidence Membership Interests shall be stamped or typed
in a conspicuous place with the following legend:

         THE INTEREST REPRESENTED BY THIS CERTIFICATE IS SUBJECT TO THE LIMITED
         LIABILITY AGREEMENT OF THE COMPANY DATED AS OF JANUARY 17, 1997, AS IT
         EXISTS FROM TIME TO TIME, WHICH RESTRICTS ANY SALE, ASSIGNMENT,
         TRANSFER, CONVEYANCE, ENCUMBRANCE, PLEDGE OR OTHER TRANSFER OR
         ALIENATION (WITH OR WITHOUT CONSIDERATION) OF SUCH INTEREST. THE
         COMPANY WILL FURNISH TO THE RECORD HOLDER OF THIS CERTIFICATE, WITHOUT
         CHARGE, UPON WRITTEN REQUEST TO THE COMPANY AT ITS PRINCIPAL PLACE OF
         BUSINESS, A COPY OF SUCH LIMITED LIABILITY AGREEMENT. THE SECURITIES
         REPRESENTED BY THIS CERTIFICATE HAVE BEEN ACQUIRED FOR INVESTMENT AND
         HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED,
         OR THE SECURITIES LAWS OF ANY STATE. WITHOUT SUCH REGISTRATION, SUCH
         SECURITIES MAY NOT BE SOLD, ASSIGNED, TRANSFERRED, CONVEYED, PLEDGED,
         HYPOTHECATED, OR OTHERWISE TRANSFERRED, EXCEPT UPON DELIVERY TO THE
         COMPANY OF AN OPINION OF COUNSEL SATISFACTORY TO THE COMPANY THAT SUCH
         REGISTRATION IS NOT REQUIRED FOR SUCH TRANSFER.

Such legend shall also be placed on all Certificates which are hereafter issued
to any Member.

         14.6 LOST, STOLEN OR DESTROYED CERTIFICATES. The Company may direct a
new certificate or certificates to be issued in place of any certificate or
certificates theretofore issued by the Company alleged to have been lost, stolen
or destroyed upon the making of an affidavit of that fact by the Person claiming
the certificate of stock to be lost, stolen or destroyed. When authorizing such
issue of a new certificate or


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<PAGE>   75

certificates, the Company may, in its discretion and as a condition precedent to
the issuance thereof, require the owner of such lost, stolen or destroyed
certificate or certificates, or his legal representative, to advertise the same
in such manner as it shall require and/or to give the Company a bond in such sum
as it may direct as indemnity against any claim that may be made against the
Company with respect to the certificate alleged to have been lost, stolen or
destroyed.

         14.7 TRANSFER OF MEMBERSHIP INTEREST. Upon surrender to the Company or
its transfer agent, if any, of a certificate representing Membership Interests
duly endorsed or accompanied by proper evidence of succession, assignation or
authority to Transfer in accordance with this Agreement and of the payment of
all taxes applicable to the Transfer of said Membership Interest, the Company
shall be obligated to issue a new certificate to the Person entitled thereto,
cancel the old certificate and record the transaction upon its books, provided,
however, that the Company shall not be so obligated unless such Transfer was
made in compliance with the provisions of this Agreement and any applicable
state and federal Laws.

         14.8 REGISTERED HOLDERS. The Company shall be entitled to recognize the
exclusive right of a Person registered on its books as the owner of the
indicated Membership Interest and shall not be bound to recognize any equitable
or other claim to or interest in such Membership Interest on the part of any
Person other than such registered owner, whether or not it shall have express or
other notice thereof, except as otherwise provided by Law.

                                  ARTICLE XV.
                     OTHER MEMBER AGREEMENTS AND OBLIGATIONS

         15.1 LATERAL OPPORTUNITIES.

                  (a) Limitation on Lateral Opportunities. Except as otherwise
         provided in this Section 15.1(a), no constituent of the Shell Gas
         Pipeline Companies, Marathon Gas Pipeline Companies or Leviathan Gas
         Pipeline Companies, will, directly or indirectly, enter into any
         agreement to construct or otherwise consummate transactions involving
         construction of any Lateral in which such constituent would own an
         interest (a "Lateral Opportunity") until such Lateral Opportunity has
         been rejected or otherwise forfeited by Manta Ray or Nautilus, as
         applicable. Any constituent of the Shell Gas Pipeline Companies,
         Marathon Gas Pipeline Companies, or Leviathan Gas Pipeline Companies
         may enter into an agreement, which may be amended from time to time,
         with their respective Affiliates involving a Lateral Opportunity and,
         if applicable, the terms and conditions of such agreement or agreements
         will be offered to Nautilus or Manta Ray as applicable pursuant to the
         terms and conditions of Section 15.1(b). Notwithstanding the foregoing,
         any constituent of the Shell Gas Pipeline Companies, Marathon Gas
         Pipeline Companies or Leviathan Gas Pipeline Companies may without
         complying with the provisions


                                       71
<PAGE>   76

         of this Section 15.1, construct a Lateral (i) designed solely for the
         purpose of gathering or transporting natural gas produced from a
         commercial property in which such constructing constituent of the Shell
         Gas Pipeline Companies, Marathon Gas Pipeline Companies or Leviathan
         Gas Pipeline Companies, as the case may be, or any Affiliate thereof,
         owns an interest; provided that (x) such interest in the natural gas to
         be gathered or transported by such Lateral was acquired by the relevant
         Person primarily for a purpose other than the avoidance of the
         provisions of this Section and (y) such exception shall not apply to
         any Lateral sized in such a manner that it would accommodate production
         from (a) any lease or commercial property in which Shell Holding,
         Marathon Holding or Leviathan Holding, or their Affiliate does not have
         an interest or (b) any lease owned by Shell Holding, Marathon Holding,
         or Leviathan Holding, or their Affiliate, which is not a commercial
         property; or (ii) in which any constituent of the Shell Gas Pipeline
         Companies, Marathon Gas Pipeline Companies, or Leviathan Gas Pipeline
         Companies would own an interest of less than 100% of the Lateral or of
         less than 100% of the entity owning the Lateral because an Affiliate
         does not own one hundred percent (100%) of the production.

                  (b) Delivery of Lateral Opportunity Notice. Any Member may
         propose that Manta Ray or Nautilus, as applicable, undertake a Lateral
         Opportunity by delivering written notice (a "Lateral Opportunity
         Notice") to Manta Ray or Nautilus, as applicable, and each of the
         Members. (A) A Lateral Opportunity Notice involving the connection
         solely of third party production shall include the proposed terms and
         conditions of such transactions, which terms shall, at minimum, (x)
         reflect an arms length transaction on reasonably fair terms,
         independent of any other transaction, and (y) be no less favorable to
         Nautilus or Manta Ray as applicable than the Lateral Opportunity
         offered to such Member. The Lateral Opportunity Notice shall also
         contain reasonably sufficient operational and financial information and
         other details to allow the Members to make a reasonably informed
         decision with respect to such Lateral Opportunity. Such Lateral
         Opportunity Notice shall (i) state whether such Lateral Opportunity is,
         directly or indirectly, related in any way to any past, current or
         contemplated transaction involving the Member delivering such notice
         (including its Affiliates), (ii) contain a statement, if true, that the
         Member is not aware of any undisclosed benefits expected to accrue to
         the Member or its Affiliates as a result of such Lateral Opportunity
         or, if the delivering Member is unable to make such statement, the
         notice shall disclose the existence, but not the details of such other
         benefits, and (iii) contain only financial projections prepared in good
         faith based upon assumptions relating to such Lateral Opportunity
         believed by the Member to be reasonable. (B) A Lateral Opportunity
         Notice involving the connection of any production of a Member or its
         Affiliates that must be offered to Nautilus or Manta Ray as applicable
         under the terms of Section 15.1(a) shall include the proposed terms and
         conditions of such transactions, which terms shall be no less favorable
         to the Company than the Lateral Opportunity offered to such Member. The
         Lateral Opportunity


                                       72
<PAGE>   77

         Notice shall also contain reasonably sufficient operational and
         financial information and other details to allow the Members to make a
         reasonably informed decision with respect to such Lateral Opportunity.

                  (c) Rejected Lateral Opportunities. If Nautilus or Manta Ray,
         as applicable, do not vote to accept the Lateral Opportunity and
         deliver notice accordingly in writing within 30 days after Manta Ray or
         Nautilus, as applicable, receives the Lateral Opportunity Notice that
         Manta Ray or Nautilus, as applicable, should undertake such project on
         the terms and conditions set forth in the applicable Lateral
         Opportunity Notice, then the Member (and/or its Affiliates) who
         provided and voted in favor of the Lateral Opportunity Notice shall
         have the right to pursue such project (a "Rejected Lateral
         Opportunity") on the terms and conditions set forth in the applicable
         Lateral Opportunity Notice and own any assets related thereto. In such
         event, the Member who provided the Lateral Opportunity Notice (and/or
         its Affiliates) shall be free for a period of 120 days to enter into
         definitive agreements, if any, or otherwise consummate the transactions
         contemplated by the applicable Lateral Opportunity Notice on the same
         terms and conditions set forth in the applicable Lateral Opportunity
         Notice without further obligation to any Members or Manta Ray or
         Nautilus, as applicable; provided that following such 120 day period
         such Member or its Affiliates may not enter into definitive agreements,
         if any, or otherwise consummate the transactions with respect to a
         Rejected Lateral Opportunity without again offering the same to Manta
         Ray or Nautilus, as applicable, in accordance with this Article. No
         Member shall have any obligation or duty to Manta Ray or Nautilus, as
         applicable, or the other Members with respect to any Rejected Lateral
         Opportunity to the extent it is covered by definitive agreements
         entered into, or otherwise consummated, by such Member or its
         Affiliates after compliance with this Section 15.1 or with respect to
         any modification, renewal or extension of the terms of such definitive
         agreements with respect to any such Rejected Lateral Opportunity.
         Except as set forth in this Section, the construction, acquisition,
         operation, maintenance and ownership of each such Rejected Lateral
         Opportunity project shall not be governed or affected by this
         Agreement.

         15.2 EXPANSIONS.

                  (a) Expansion Option. Any Member (the "Exercising Member")
         shall have the right to require the Company to cause Manta Ray or
         Nautilus, as applicable, to construct, own and operate a particular
         Major Expansion Project (the "Expansion Option") if (i) the Exercising
         Member or an Affiliate of the Exercising Member has delivered written
         notice (the "Capacity Request") to Manta Ray or Nautilus as applicable,
         requesting, pursuant to a Dedication Agreement, firm capacity on the
         Manta Ray System or the Nautilus System, whichever is applicable, to
         gather or transport gas (including gas which is not owned by the
         Exercising Member or its Affiliate) from one or more leases dedicated
         pursuant to the relevant Dedication Agreement (the "Expansion


                                       73
<PAGE>   78

         Property") to the extent the expected volume (including increases in
         volume from existing properties of which some or all of the volumes
         could be Accelerated Volumes) of the production from which (the
         "Expansion Property Production") at the time of such notice is not
         being delivered into the Manta Ray System or the Nautilus System,
         whichever is applicable, (ii) the Accessible Capacity is not sufficient
         to practically handle substantially all of the Expansion Property
         Production, (iii) the relevant Major Expansion Project is necessary to
         increase the Base Capacity to a level adequate to allow Manta Ray or
         Nautilus, as applicable, to handle the Expansion Property Production,
         (iv) within 60 days from the latest date on which Manta Ray or
         Nautilus, as applicable, has the right to respond to the Capacity
         Request (the "Expansion Option Period"), each of the Company and Manta
         Ray or Nautilus, as applicable, have held a meeting and voted against
         the relevant Major Expansion Project, (v) the Exercising Member voted
         in favor of the relevant Major Expansion Project at such meeting, and
         (vi) the Expansion Option is exercised in accordance with the
         requirements of Section 15.2(b) below.

                  (b) Exercise. The Exercising Member shall exercise the
         Expansion Option by delivering, at any time after such Major Expansion
         Project has been rejected by each of the Company and Manta Ray or
         Nautilus, as applicable, but before the end of the Expansion Option
         Period, written notice of such exercise (the "Expansion Option Notice")
         to the Company and each Member. Such notice shall include an
         irrevocable commitment to timely fund the relevant Major Expansion
         Project and, if appropriate, assurances reasonably satisfactory to the
         Company that such Member has the ability to fund such Major Expansion
         Project; provided, however, that no such additional assurances will be
         required of Shell Holding, Marathon Holding or Leviathan Holding as
         long as their respective funding obligations are subject to a relevant
         parent-company guaranty that provides the same practical benefits to
         the Company as the guaranty entered into as of the date hereof.
         Whenever an Exercising Member delivers an Expansion Option Notice,
         every other Member which voted in favor of the relevant Major Expansion
         Project at the last meeting during which such project was voted on
         (together with the Exercising Member, the "Expansion Participants")
         shall have the right to participate, proportionately (based on the
         relationship of its Membership Interest to the Membership Interests of
         all of the Expansion Participants), in such project on the same basis
         as the Exercising Member, including the right to receive the Payout
         Amount out of 80% of the Expanded Capacity Revenues and the obligation
         to fund such project. Any Member which desires to exercise its right to
         participate in such project must deliver a notice substantially similar
         to that delivered by the original Exercising Member in accordance with
         the terms of this subsection, within 30 days after it receives the
         Expansion Option Notice. If any Expansion Participant pays any amount
         to the Company in excess of the amount needed to fund the Expansion
         Project, the Company shall immediately return such excess amount to the
         Expansion Participant.


                                       74
<PAGE>   79

                  (c) Repayment. Until the Expansion Participants have (i)
         received payment with respect to 80% of the Expanded Capacity Revenues
         in an amount equal to the Payout Amount or (ii) the Company, by a
         unanimous vote of all Members other than the Expansion Participants,
         has otherwise paid the unamortized portion of the Payout Amount to the
         Expansion Participants as described below, the Expansion Participants
         shall be paid monthly amounts equal to 80% of the Expanded Capacity
         Revenues. Such amounts shall be allocated among the Expansion
         Participants in proportion to the Membership Interests of each such
         Expansion Participant to the Membership Interests of all such Expansion
         Participants. The remaining 20% of the Expanded Capacity Revenues shall
         be retained by the Company and allocated to all of the Members based on
         their respective Membership Interests. After recovery of the Payout
         Amount or payment by the Company of the unamortized portion of the
         Payout Amount to the Expansion Participants as described below, all of
         the Expansion Capacity Revenues shall be retained by the Company and
         allocated to all of the Members based on their respective Membership
         Interests. If, at any time the Company, by a unanimous vote of all
         Members other than the Expansion Participants, elects to pay off the
         unamortized amount of the Payout Amount, the Company shall promptly pay
         an amount equal to the then-remaining unpaid principal amount of the
         Payout Amount to the Expansion Participants, which remaining unpaid
         principal amount shall be calculated by treating as principal payments
         10/15 of all amounts received by the Expansion Participants prior to
         such time in satisfaction of the Payout Amount.

                  (d) Capacity. Prior to proceeding with any Major Expansion
         Project in accordance with this Section, all of the Members shall
         cooperate to establish (i) the Accessible Capacity, using the lesser of
         (x) the maximum approved operating pressure, (y) the then existing
         contractual operating pressure or (z) the maximum physical pressure at
         which the line can operate, in each case determined at the inlet of
         each relevant point of receipt and the pressure (averaged over the last
         three months) at the relevant points of delivery and (ii) an expansion
         design to handle the Expansion Property Production. If the Members
         cannot agree on any such matter, the Company shall engage an
         independent consultant (of national prominence with experience in the
         relevant geographical area) to resolve each such matter.

                  (e) Treatment as Loan. Any amount paid by one or more Members
         pursuant to Section 15.2(b) shall be considered to be a limited
         recourse, partially secured loan from the advancing Members to the
         Company, with such loan payable only from, and secured only by a
         security interest granted by the Company in, 80% of the Expanded
         Capacity Revenues until such loan is paid in full. Except for such
         security interest in 80% of the Expanded Capacity Revenues, such loan
         shall be without recourse against the Company. The Company shall have
         no obligation to repay such loan other than to the extent that 80% of
         the Expanded Capacity Revenues are available.


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<PAGE>   80

         15.3 CERTAIN PROPERTIES. Notwithstanding anything contained in this
Agreement to the contrary, Leviathan Holding and any of its Affiliates shall
have the right, at their sole cost, expense and risk, to construct pipeline
laterals or extensions or related facilities to connect the Manta Ray System to
gas produced from Blocks 871, 914, 915, 916, 958, 959, 1002 and 1003 in the
Ewing Bank Area, Gulf of Mexico pursuant to any agreement existing on the
Formation Date. Such right shall be absolute and unconditional and shall be free
and clear of any obligation to offer the Company or any Member the right to
participate therein.


                                  ARTICLE XVI.
                               GENERAL PROVISIONS

         16.1 OFFSET. Whenever the Company is to pay any sum to any Member, any
amounts that a Member owes the Company may be deducted from that sum before
payment.

         16.2 ENTIRE AGREEMENT; SUPERSEDURE. This Agreement constitutes the
entire agreement and supersedes (i) all prior oral or written proposals or
agreements (ii) all contemporaneous oral proposals or agreements and (iii) all
previous negotiations and all other communications or understandings between the
Parties with respect to the subject matter hereof, including, without
limitation, that certain Letter of Intent dated June 24, 1996 between Leviathan
Gas Pipeline Partners, L.P., Shell Offshore Inc., and Marathon Oil Company,
among others, and the related Letter of Intent dated September 10, 1996, but
excluding any confidentiality agreement between or among any Members or their
Affiliates and the letter agreement referred to in Section 3.17(a)(iii).

         16.3 WAIVERS. Neither action taken (including, without limitation, any
investigation by or on behalf of any Party) nor inaction pursuant to this
Agreement, shall be deemed to constitute a waiver of compliance with any
representation, warranty, covenant or agreement contained herein by the Party
not committing such action or inaction. A waiver by any Party of a particular
right, including, without limitation, breach of any provision of this Agreement,
shall not operate or be construed as a subsequent waiver of that same right or a
waiver of any other right.

         16.4 BINDING EFFECT. This Agreement shall be binding upon and inure to
the benefit of the Members and their respective heirs, legal representatives,
successors and assigns.

         16.5 MEMBER DEADLOCKS; NEGOTIATIONS AND MEDIATION.

                  (a) Member Deadlocks. Except for any matter or proposal
         covered by the immediately succeeding sentence, Member approval or
         disapproval of any matter shall not be subject to the provisions of
         this Section 16.5. If any matter or proposal covered by Sections
         6.3(b)(i)-(iv) or relating to an operating budget described in Section
         6.3(b)(v), requiring the vote of less than all of the Membership
         Interest for approval thereof is brought before the Members and


                                       76
<PAGE>   81

         receives neither (x) at least the Required Interest voting for such
         matter or proposal nor (y) at least the Required Interest voting
         against (not including abstentions or other non-votes) such matter or
         proposal, then any Member, by written notice to the other Members given
         within three Business Days after the initial vote on such matter or
         proposal, may call a meeting of the Members to reconsider such matter
         or proposal, such meeting to be held when, where and as reasonably
         specified in said notice, but not less than three Business Days nor
         more than seven Business Days after the date of such vote. If such
         meeting is called and held as herein provided and the matter or
         proposal is offered at such meeting again and (x) does not receive at
         least the Required Interest voting for such matter or proposal or (y)
         does not receive at least the Required Interest voting against (not
         including abstentions or other non-votes) such matter or proposal, then
         any Member may within three Business Days thereafter submit the matter
         to further negotiation, and, if applicable, non-binding mediation, in
         accordance with this Section. If no Member calls such a meeting within
         the first three Business Day period herein provided for or if further
         negotiation is not requested within the three Business Day period after
         the second meeting, no Member shall thereafter have any right to
         request further negotiation or non-binding mediation regarding such
         matter or proposal.

                  (b) Further Negotiation. Any Member wishing to submit a matter
         or proposal to further negotiation as permitted above or pursuant to
         Section 16.8 shall do so by giving written notice of further
         negotiation to the other Members containing a brief description of the
         nature of the dispute to be further negotiated and the position of the
         Member initiating further negotiation. Upon receipt of such notice,
         each Member shall appoint a representative for such further
         negotiations, which representative shall hold a position with the
         Person owning such Member of equal or superior status to the prior
         representative of such Member with respect to the proposal in question.
         The respective representatives shall meet at the principal office of
         the Company at 10:00 a.m. local time on the third Business Day after
         the date of receiving the notice of further negotiations.

                  (c) Non-Binding Mediation. If within ten Business Days
         following initial receipt by the Members of the notice of further
         negotiations neither (x) at least the Required Interest votes for such
         matter or proposal nor (y) at least the Required Interest votes against
         (not including abstentions or other non-votes) such matter or proposal,
         then any Member may subject the matter or proposal to non-binding
         mediation by giving written notice of mediation to the other Members
         within five Business Days thereafter. The notice of mediation shall
         state the identity of the single mediator selected by the Member
         initiating mediation and contain a detailed statement of the nature of
         the dispute to be mediated and the remedy or resolution sought by the
         Member initiating mediation. Neither the Members nor the mediator will
         have the right to conduct any further discovery relating to such
         mediation. The Member or Members initiating mediation shall pay the
         fees of the mediator; provided, however, that


                                       77
<PAGE>   82

         if the vote of the Members changes as a result of such mediation, then
         the Company shall pay all such fees and each of the Members' costs
         related to such mediation. Unless otherwise agreed by all of the
         Members, the mediation proceedings shall be held in Houston, Texas at
         such location selected by the mediator and shall begin as soon as
         practicable, but not less than five Business Days following the mailing
         of the initiating Member's notice of mediation. If within five Business
         Days following initiation of mediation proceedings neither (x) at least
         the Required Interest votes for such matter or proposal nor (y) at
         least the Required Interest votes against (not including abstentions or
         other non-votes) such matter or proposal, then such mediation shall
         terminate and such matter or proposal will no longer be subject to
         further negotiation or mediation. Except with respect to the matters
         expressly specified in Section 16.5(a) and Section 16.8, no Member
         shall have the right to demand mediation with respect to any dispute,
         difference or question arising between any of the Members themselves or
         any Member and the Company.

         16.6 GOVERNING LAW; SEVERABILITY.

                  (a) THIS AGREEMENT HAS BEEN EXECUTED AND DELIVERED AND SHALL
         BE CONSTRUED, INTERPRETED AND GOVERNED PURSUANT TO AND IN ACCORDANCE
         WITH THE LAWS OF THE STATE OF DELAWARE, WITHOUT REGARD TO ANY CONFLICT
         OF LAWS PRINCIPLES WHICH, IF APPLIED, MIGHT PERMIT OR REQUIRE THE
         APPLICATION OF THE LAWS OF ANOTHER JURISDICTION.

                  (b) In the event of a direct conflict between the provisions
         of this Agreement and any mandatory provision of the Act or applicable
         Laws, the applicable provision of the Act or other applicable Laws, as
         the case may be, shall control. If any provision of this Agreement, or
         the application thereof to any Person or circumstance, is held invalid
         or unenforceable to any extent, the remainder of this Agreement and the
         application of that provision to other Persons or circumstances shall
         not be affected thereby and that provision shall be enforced to the
         greatest extent permitted by the Act or other applicable Laws, as the
         case may be.

         16.7 FURTHER ASSURANCES. Subject to the terms and conditions set forth
in this Agreement, each of the Parties agrees to use all reasonable efforts to
take, or to cause to be taken, all actions, and to do, or to cause to be done,
all things necessary, proper or advisable under applicable Laws and regulations
to consummate and make effective the transactions contemplated by this
Agreement. In case, at any time after the execution of this Agreement, any
further action is necessary or desirable to carry out its purposes, the proper
officers or directors of the Parties shall take or cause to be taken all such
necessary action.


                                       78
<PAGE>   83

         16.8 EXERCISE OF CERTAIN RIGHTS. No Member may maintain any action for
partition of the property of the Company. No Member may maintain any action for
dissolution and liquidation of the Company unless such Member has submitted the
dispute giving rise to such possible action to further negotiation and
non-binding mediation, which further negotiation and mediation shall be
conducted in accordance with the time periods and procedures set forth in
Section 16.5(b) and (c), to the extent applicable. If such dispute is still
unresolved after the conclusion of such further negotiation and non-binding
mediation, such Member shall offer to sell its Membership Interest (free and
clear of all liens and encumbrances) to the other Members for an amount of cash
equal to the fair market value of the selling Member's Membership Interest,
determined by multiplying such selling Member's Membership Interest by the fair
market value of the Company, as a whole, without regard to any discounts or
premiums related to minority interest, controlling interest, liquidity or
related matters. If such Members do not agree on the fair market value thereof,
such value shall be determined by an arbitrator in accordance with the
arbitration procedures set forth in Section 3.6(e). If the non-selling Members
do not exercise the option to purchase such Membership Interest within 60 days
after the fair market value is determined, then the selling Member shall have
the right for a period of 30 days after such 60-day period to initiate an action
for such dissolution and liquidation pursuant to section 18-802 of the Act or
any similar applicable statutory or common law dissolution right. If no Member
has brought such action for dissolution within such 30 day period, then any
Member may maintain an action for dissolution and liquidation only after again
following the procedures set forth in this Section. Upon the institution of, and
during the pendency of, any such dissolution proceeding, the Members agree to
use commercially reasonable efforts to employ procedures and experts to ensure
that such dissolution process will result in the Company and/or its assets being
disposed of at fair market value; provided that such cooperative efforts shall
not constitute a waiver or limitation of any such Member's right to contest such
dissolution. Such procedures shall include soliciting likely potential
purchasers, establishing a data room and other information sharing procedures
and, if appropriate, engaging an investment banker, consultant or other expert
to facilitate and enhance the marketing efforts. The terms and conditions of
this Section 16.8 are intended to preserve any right to dissolution created by
statute or common law (such as by section 18-802 of the Act), but do not create
any contractual right to dissolution.

         16.9 NOTICE TO MEMBERS OF PROVISIONS OF THIS AGREEMENT. By executing
this Agreement, each Member acknowledges that it has actual notice of all of the
provisions of this Agreement. Each Member hereby agrees that this Agreement
constitutes adequate notice of all such provisions.

         16.10 COUNTERPARTS. This Agreement may be executed in multiple
counterparts, each of which, when executed, shall be deemed an original, and all
of which shall constitute but one and the same instrument.

         16.11 ATTENDANCE VIA COMMUNICATIONS EQUIPMENT. Unless otherwise
restricted by law or this Agreement, the Members or committees may hold meetings
by


                                       79
<PAGE>   84

means of telephone conference or other communications equipment by means of
which all Persons participating in the meeting can effectively communicate with
each other. Such participation in a meeting shall constitute presence in person
at the meeting, except where a Person participates in the meeting for the
express purpose of objecting to the transaction of any business on the ground
that the meeting is not lawfully called or convened.

         16.12 REPORTS TO MEMBERS. The officers of the Company shall present at
each annual meeting of Members, and at any special meeting of Members, a
statement of the business and condition of the Company.

         16.13 CHECKS, NOTES AND CONTRACTS. Checks and other orders for the
payment of money shall be signed by such Person or Persons as the Company shall
from time to time by resolution determine. Contracts and other instruments or
documents may be signed in the name of the Company by any Person or Persons as
the Company shall from time to time by resolution determine, authorized to sign
such contract, instrument or document by the Company, and such authority may be
general or confined to specific instances. Checks and other orders for the
payment of money made payable to the Company may be endorsed for deposit to the
credit of the Company, with a depositary authorized by resolution of the
Company, by the Chief Financial Officer or Treasurer or such other Persons as
the Company may from time to time by resolution determine.

         16.14 SEAL. The seal of the Company shall be in such form as shall from
time to time be adopted by the Company. The seal may be used by causing it or a
facsimile thereof to be impressed, affixed or otherwise reproduced.

         16.15 BOOKS AND RECORDS. The officers of the Company shall keep correct
and complete books and records of account, including the names and addresses of
all Members and the number and class of the interest held by each, and minutes
of the proceedings of the Members at its registered office or principal place of
business, or at the office of its transfer agent or registrar.

         16.16 SURETY BONDS. Such officers and agents of the Company (if any) as
the Company may direct, from time to time, shall be bonded for the faithful
performance of their duties and for the restoration to the Company, in case of
their death, resignation, retirement, disqualification or removal from office,
of all books, papers, vouchers, money and other property of whatever kind in
their possession or under their control belonging to the Company, in such
amounts and by such surety companies as the Company may determine. The premiums
on such bonds shall be paid by the Company and the bonds so furnished shall be
in the custody of the Secretary.

         16.17 AUDIT RIGHTS OF MEMBERS.

                  (a) Each Member shall have the right to inspect and audit the
         books and records of the Company to the extent necessary to determine
         the accuracy of

                                       80
<PAGE>   85

         the financial statements delivered to the Members pursuant to Section
         10.2 of this Agreement. Such audits shall be conducted at the cost of
         the Member(s) requesting same. The audit rights with respect to any
         calendar year or any portion of such year shall terminate on and as of
         the last day of the second calendar year immediately following the year
         in question. A Member may exercise its audit rights hereunder by giving
         at least 30 days written notice to the Company of the desire to perform
         such audit, which notice shall include the estimated timing and other
         particulars related to such audit. The audit shall be conducted during
         normal business hours of the Company. The audit shall not unreasonably
         interfere with the operation of the Company. If any financial statement
         is not challenged within 3 years, then it shall be presumed to be
         accurate.

                  (b) Any Member shall have the right to cause the Company or a
         Subsidiary of the Company to exercise its inspection and audit rights,
         if any, under any Construction Agreement or Operating Agreement. The
         costs related thereto shall be paid by the Member(s) requesting same.

         16.18 NO THIRD PARTY BENEFICIARIES. Except to the extent a third party
is expressly given rights herein, any agreement herein contained, expressed or
implied, shall be only for the benefit of the Parties and their respective legal
representatives, successors, and assigns, and such agreements shall not inure to
the benefit of any other Person whomsoever, it being the intention of the
parties hereto that no Person shall be deemed a third party beneficiary of this
Agreement except to the extent a third party is expressly given rights herein.

         16.19 NOTICES. Except as otherwise expressly provided in this Agreement
to the contrary (including in the definition of the term Default), any notice
required or permitted to be given under this Agreement shall be in writing
(including telex, facsimile, telecopier or similar writing) and sent to the
address of the Party set forth below, or to such other more recent address of
which the sending Party actually has received written notice:

         (a) if to the Company, to:

         Neptune Pipeline Company, L.L.C.
         Attn: Mr. Doug Krenz
         200 N. Dairy Ashford, Suite 3100
         Houston, Texas 77079
         Telephone(281) 544-2224
         Telecopy(281) 544-2201


         (b) if to the Members, to each of the Members listed on Exhibit A at
the address set forth therein.


                                       81
<PAGE>   86

         Each such notice, demand or other communication shall be effective, if
given by registered or certified mail, return receipt requested, as of the third
day after the date indicated on the mailing certificate, or if given by any
other means, when delivered at the address specified in this Section.

         16.20 REMEDIES. Except as expressly provided herein, the rights,
obligations and remedies created by this Agreement are cumulative and in
addition to any other rights, obligations or remedies otherwise available at law
or in equity. Other than the obligation to arbitrate pursuant to Section 16.21,
in lieu of seeking judicial remedies, nothing herein shall be considered an
election of remedies. In addition, any successful Party is entitled to costs
related to enforcing this Agreement, including, without limitation, attorneys'
fees, and arbitration expenses. NOTWITHSTANDING ANYTHING TO THE CONTRARY, THE
PARTIES WAIVE ANY AND ALL RIGHTS, CLAIMS OR CAUSES OF ACTION ARISING UNDER THIS
AGREEMENT FOR INCIDENTAL, CONSEQUENTIAL, PUNITIVE OR EXEMPLARY DAMAGES. A PARTY
MAY RECOVER FROM THE OTHER PARTY ALL COSTS, EXPENSES OR DAMAGES INCLUDING,
WITHOUT LIMITATION, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL, EXEMPLARY,
PUNITIVE AND DAMAGES PAID OR OWED TO ANY THIRD PARTY FOR WHICH SUCH PARTY HAS A
RIGHT TO RECOVER FROM THE OTHER PARTY.

         16.21 DISPUTES.

                  (a) Applicability. Any controversy or claim, whether based on
         contract, tort, statute or other legal or equitable theory (including
         but not limited to any claim of fraud, misrepresentation or fraudulent
         inducement or any question of validity or effect of this Agreement
         including this clause) arising out of or related to this Agreement
         (including any amendments or extensions), or the breach or termination
         thereof shall be settled by arbitration in accordance with the then
         current CPR Institute Rules for Non-Administered Arbitration of
         Business Disputes, and this provision. The arbitration shall be
         governed by the United States Arbitration Act, 9 U.S.C. Sections 1-16
         to the exclusion of any provision of Law inconsistent therewith or
         which would produce a different result, and judgment upon the award
         rendered by the arbitrator may be entered by any court having
         jurisdiction. Notwithstanding the foregoing, this Section shall not
         apply to (x) any matters that, pursuant to the provisions of this
         Agreement, are to be resolved by a vote of the Members or (y) any of
         the rights of non-defaulting Members set forth in Section 4.3. Any
         dispute to which this Section applies is referred to herein as a
         "Dispute." With respect to a particular Dispute, each Person that is a
         party to such Dispute is referred to herein as a "Disputing Party." The
         provisions of this Section shall be the exclusive method of resolving
         Disputes.


                                       82
<PAGE>   87

                  (b) Negotiation to Resolve Disputes. If a Dispute arises, the
         Disputing Parties shall attempt to resolve such Dispute through the
         following procedure:

                           (i) first, each of the Disputing Parties shall
                  promptly meet (whether by phone or in person) in a good faith
                  attempt to resolve the Dispute.

                           (ii) second, if the Dispute is still unresolved after
                  ten Business Days following the commencement of the
                  negotiations described in Section 16.21(b)(i), then the chief
                  executive officer (or his designee) of the direct parent of
                  each Disputing Party shall meet (whether by phone or in
                  person) in a good faith attempt to resolve the Dispute; and

                           (iii) third, if the Dispute is still unresolved after
                  ten Business Days following the commencement of the
                  negotiations described in Section 16.21(b)(ii), then any
                  Disputing Party may submit such Dispute to binding arbitration
                  under this Section by written notice to the other Disputing
                  Parties (an "Arbitration Notice") delivered within thirty
                  Business Days thereafter.

                           (iv) At the same time that the Disputing Member sends
                  an Arbitration Notice to the other Disputing Members, it shall
                  also send an Arbitration Notice to the regional office of the
                  CPR Institute covering Houston, Texas. The Arbitration Notice
                  shall contain a brief description of the nature of the dispute
                  and the name of an Arbitrator proposed by the Disputing
                  Member.

                  (c) Selection of Arbitrator.

                           (i) Any arbitration conducted under this Section
                  shall be heard by a sole arbitrator (the "Arbitrator")
                  qualified by his or her education, experience and training to
                  resolve the disputed matters and shall be selected in
                  accordance with this Section. Each Disputing Party and each
                  proposed Arbitrator shall disclose to the other Disputing
                  Parties any business, personal or other relationship or
                  affiliation that may exist between such Disputing Party and
                  such proposed Arbitrator within ten Business Days following
                  delivery of the Arbitration Notice.

                           (ii) The Disputing Party that submits a Dispute to
                  arbitration shall designate a proposed Arbitrator in its
                  Arbitration Notice. If any other Disputing Party objects for
                  any reason to such proposed Arbitrator, it may, on or before
                  the tenth Business Day following delivery of the Arbitration
                  Notice, notify all of the other Disputing Parties of such
                  objection. All of the Disputing Parties shall attempt to agree
                  upon a mutually acceptable Arbitrator. If they are unable to
                  do so within seven


                                       83
<PAGE>   88

                  Business Days following delivery of the notice described in
                  the immediately-preceding sentence, any Disputing Party may
                  request the regional office of the CPR Institute covering
                  Houston, Texas to designate the Arbitrator who shall be
                  qualified by his or her education, experience and training to
                  resolve the disputed matters. Failing designation by the
                  regional office of the CPR Institute covering Houston, Texas,
                  any Disputing Party may in writing request the judge of the
                  United States District Court for the Southern District of
                  Texas senior in term of service to appoint an Arbitrator
                  qualified by his or her education, experience and training to
                  resolve the disputed matters. If the Arbitrator so chosen
                  shall die, resign or otherwise fail or becomes unable to serve
                  as Arbitrator, a replacement Arbitrator shall be chosen in
                  accordance with this Section.

                  (d) Conduct of Arbitration.

                           (i) Any arbitration hearing shall be held in Houston,
                  Texas. The Arbitrator shall fix a reasonable time and place
                  for the hearing and shall determine the matters submitted to
                  it pursuant to the provisions of this Agreement in a timely
                  manner; provided, however, if the Arbitrator shall fail to
                  hold the hearing to determine the issue in dispute within
                  sixty (60) days after the selection of the Arbitrator, then
                  any Disputing Member shall have the right to require a new
                  Arbitrator be selected under this Section.

                           (ii) Except as expressly provided to the contrary in
                  this Agreement, the Arbitrator shall have the power (i) to
                  gather such materials, information, testimony and evidence as
                  it deems relevant to the dispute before it (and each member
                  will provide such materials, information, testimony and
                  evidence requested by the Arbitrator, except to the extent any
                  information so requested is, subject to an attorney-client or
                  other privilege); (ii) to grant injunctive relief and enforce
                  specific performance; and (iii) to issue or cause to be issued
                  subpoenas (including subpoenas directed to third-parties) for
                  the attendance of witnesses and for the production of books,
                  records, documents and other evidence. Subpoenas so issued
                  shall be served, and upon application to the Court by a party
                  or the Arbitrator, enforced, in the manner provided by law for
                  the service and enforcement of subpoenas in a civil action;
                  and (iv) to administer oaths.

                           (iii) In advance of the arbitration hearing, the
                  Disputing Members may conduct discovery in accordance with the
                  Texas Rules of Civil Procedure. Such discovery may include,
                  but is not limited to, 1) the taking of oral and videotaped
                  depositions and depositions on written questions; 2) serving
                  interrogatories, document requests and requests for admission;
                  and 3) any other form and/or method of discovery provided


                                       84
<PAGE>   89

                  for under the Texas Rules of Civil Procedure. The Arbitrator
                  shall order the parties to promptly exchange copies of all
                  exhibits and witness lists, and, if requested by a party, to
                  produce other relevant documents, to answer up to ten
                  interrogatories (including subparts), to respond to up to ten
                  requests for admissions (which shall be deemed admitted if not
                  denied) and to produce for deposition and, if requested, at
                  the hearing all witnesses that such party has listed and up to
                  four other persons within such party's control. Any additional
                  discovery shall only occur by agreement of the parties or as
                  ordered by the Arbitrator upon a finding of good cause. Any
                  objections and/or responses to such discovery shall be due on
                  or before fifteen (15) days after service. The Disputing
                  Members shall attempt in good faith to resolve any discovery
                  disputes that may arise. If the Disputing Members are unable
                  to resolve any such disputes, the Disputing Members may
                  present their objections to the Arbitrator who shall resolve
                  the objections in accordance with the Texas Rules of Civil
                  Procedure. The Arbitrator may, if requested by a party, order
                  that a trade secret or other confidential research,
                  development or commercial information not be revealed or be
                  revealed only in a designated way.

                           (iv) The Disputing Members may also retain, with the
                  consent of the arbitrator, one or more experts to assist the
                  Arbitrator in resolving the Dispute. The Disputing Members
                  shall identify and produce a report from any experts who will
                  give testimony and/or evidence at the arbitration hearing. Any
                  testifying experts identified shall be made available for
                  deposition in advance of any arbitration hearing.

                           (v) The Arbitrator shall render its decision in
                  writing within fifteen (15) days of the conclusion of the
                  hearing. The arbitrator shall have jurisdiction and authority
                  to interpret and apply the provisions of this Agreement only
                  insofar as shall be necessary in the determination of the
                  dispute before it, but it shall not have jurisdiction or
                  authority to add to or alter in any way the provisions of this
                  Agreement. The Arbitrator's decision shall govern and shall be
                  final, nonappealable (except to the extent provided in the
                  Federal Arbitration Act) and binding on the Disputing Members
                  hereto and its written decision may be entered in any court
                  having appropriate jurisdiction. Pending resolution of any
                  dispute hereunder, performance by Disputing Members shall
                  continue so as to maintain the status quo prior to notice of
                  such dispute and service of notice of arbitration by any
                  Disputing Member shall not divest a court of competent
                  jurisdiction of the right and power to grant a decree
                  compelling specific performance or injunctive relief in an
                  action brought by the Disputing Members. THE ARBITRATOR AND
                  ANY COURT ENFORCING THE AWARD OF THE ARBITRATOR SHALL NOT HAVE
                  THE RIGHT OR AUTHORITY TO AWARD CONSEQUENTIAL, INCIDENTAL,
                  INDIRECT, SPECIAL, PUNITIVE OR EXEMPLARY DAMAGES TO THE
                  COMPANY


                                       85
<PAGE>   90

                  OR ANY DISPUTING MEMBERS. PROVIDED, HOWEVER, THAT THE
                  ARBITRATOR MAY AWARD ALL COSTS, EXPENSES OR DAMAGES INCLUDING,
                  WITHOUT LIMITATION, INDIRECT, SPECIAL, CONSEQUENTIAL,
                  INCIDENTAL, EXEMPLARY, PUNITIVE AND OTHER DAMAGES PAID OR OWED
                  TO ANY THIRD PARTY FOR WHICH A PARTY HAS A RIGHT TO RECOVER
                  FROM THE OTHER PARTY.

                           (vi) The responsibility for paying the costs and
                  expenses of the arbitration, including compensation to the
                  Arbitrator, shall be allocated among the Disputing Members in
                  a manner determined by the Arbitrator to be fair and
                  reasonable under the circumstances. Each Disputing Member
                  shall be responsible for the fees and expenses of its
                  respective counsel, consultants and witnesses, unless the
                  Arbitrator determines that compelling reasons exist for
                  allocating all or a portion of such costs and expenses to one
                  or more other Disputing Members.

         16.22 NO SHOP. Prior to the date on which the Members vote to accept or
reject the Construction Certificate as contemplated by Section 3.17, no Member
(including its Affiliates ) shall directly or indirectly solicit, initiate or
encourage submission of or participate in negotiations or take any action with
respect to, proposals or offers (including any from any third party) to
participate jointly in constructing, operating or owning pipelines or related
facilities of the type described herein (or any similar facilities) to gather or
transport gas from the Dedicated Leases which was not committed pursuant to a
written gathering or transportation agreement executed prior to December 1,
1995, or engage in any other transaction contemplated by this Agreement. Each
Member hereto agrees to advise the other Members in writing with respect to any
solicitation, indications of interest or other inquiries (of the type described
in the immediately preceding sentence) initiated by any party hereto or any
third party pertaining to the subject matter of this Agreement. Notwithstanding
anything to the contrary contained in this paragraph, it shall not be a
violation of the exclusivity provisions of this Agreement if (i) due to the size
of its respective operations, a representative of a Member or its Affiliates ,
which representative is not aware of this Agreement, inadvertently violates the
exclusivity provisions of this Agreement and (ii) such violation is ceased and
notice thereof delivered to the other Members promptly upon discovery of same by
such Member, nor shall it be a violation to engage in such undertakings solely
as they pertain to gas excepted from the dedication provisions of the Dedication
Agreements.

         16.23 MEMBER TRADEMARKS. Neither the Company nor any Member shall be
permitted to use any trademark owned by any other Member or its Affiliates ,
including, without limitation, the Shell "Pecten" trademark, without the express
written consent of such Member or its Affiliate or as otherwise required by Law.


                                       86
<PAGE>   91

         16.24 HOLDING-OUT. Except as required by Law, the Company shall not
publicly indicate that it is affiliated with Shell Oil Company or any of its
Affiliates , without the express written consent of Shell Holding or an
Affiliate thereof.


[THE REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]



                                       87
<PAGE>   92



         IN WITNESS WHEREOF, the Members have executed this Agreement as of the
date first set forth in this Agreement.


                                       MEMBERS:


                                       SAILFISH PIPELINE COMPANY, L.L.C.




                                       By: /s/ JAMES H. LYTAL
                                          -------------------------------------
                                       Printed Name: James H. Lytal
                                                    ---------------------------
                                       Title: President
                                             ----------------------------------



                                       MARATHON GAS TRANSMISSION INC.




                                       By: /s/ R. G. BECKER
                                          -------------------------------------
                                       Printed Name: R. G. Becker
                                                    ---------------------------
                                       Title: President
                                             ----------------------------------






                                       SHELL SEAHORSE COMPANY




                                       By: /s/ D.V. KRENZ
                                          -------------------------------------
                                       Printed Name: D.V. Krenz
                                                    ---------------------------
                                       Title: President
                                             ----------------------------------

EXHIBITS:


Exhibit A:        Ownership Information


Exhibit B:        Description of Initial Facilities


Exhibit C:        Insurance




                                       88
<PAGE>   93


                                    EXHIBIT A
                              OWNERSHIP INFORMATION

<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------------
                  NAME AND INITIAL CAPITAL                         INITIAL CAPITAL         MEMBERSHIP
                 CONTRIBUTION OF EACH MEMBER                        CONTRIBUTIONS           INTEREST
- ----------------------------------------------------------------------------------------------------------
<S>      <C>                                                        <C>                   <C>
1)       Leviathan Holding:                                             (1)                  25.67%
         Sailfish Pipeline Company, L.L.C.
         Attention: Grant E. Sims
         7200 Texas Commerce Tower
         600 Travis
         Houston, Texas 77002
         Telephone: 713/224-7400
         Facsimile: 713/547-5151
- ----------------------------------------------------------------------------------------------------------
2)       Shell Holding: (4)                                             (2)                  50.00%
         Shell Seahorse Company
         Attention: Mr. Doug Krenz, President
         200 North Dairy Ashford, Suite 3100
         Houston, Texas 77079
         Telephone: (281) 544-2224
         Facsimile: (281) 544-2201
- ----------------------------------------------------------------------------------------------------------
3)       Marathon Holding:                                              (3)                  24.33%
         Marathon Gas Transmission Inc.
         Attention: Mr. William H. Hastings
         5555 San Felipe
         P.O. Box 3128
         Houston, Texas 77253-3128
         Telephone: (713) 296-3716
         Facsimile: (713) 296-4480
- ----------------------------------------------------------------------------------------------------------
</TABLE>


(1)      Leviathan Holding shall make or cause to be made Initial Capital
         Contributions equal to:

         (a)      Contribution of those Manta Ray System assets as provided in
                  the Contribution Agreements between the Company and each of
                  Leviathan Holding and Poseidon Pipeline Company, L.L.C., each
                  of even date herewith and at an aggregate Asset Value on the
                  date hereof and on the Reconciliation Date of $50,300,000.

         (b)      Contribution of a compression package as described in Section
                  4.1(d) of this Agreement.

         (c)      Contribution of amounts equal to the cash paid by Leviathan
                  Holding on behalf of the Company for certain costs and
                  expenses related to the formation of the Company and incurred
                  by Leviathan Holding prior to the date hereof at an Asset
                  Value of $380,000.

         (d)      Contributions of cash, if required, as described in Section
                  4.1(e) of this Agreement.


                                      A-1

<PAGE>   94

         (e)      Contributions, if required, of cash as described in Section
                  4.1(f) of this Agreement.

(2)      Shell Holding shall make or cause to be made Initial Capital
         Contributions equal to:

         (a)      Contribution of the Boxer Line and other assets as provided in
                  the Contribution Agreement between the Company and Shell
                  Holding of even date herewith and at an aggregate Asset Value
                  for the Boxer Line on the date hereof and on the
                  Reconciliation Date of $4,100,000; and with respect to the
                  other assets, an amount equal to the amounts expended as of
                  the Formation Date, and which amounts are currently estimated
                  to be $0.00.

         (b)      Contribution of amounts equal to the cash paid by Shell
                  Holding on behalf of the Company for certain costs and
                  expenses related to the formation of the Company and incurred
                  by Shell Holding prior to the date hereof at an Asset Value of
                  $70,000.

         (c)      Contribution of cash pursuant to Section 4.1(c) that are not
                  already covered under any other provisions of Section 4.1.

         (d)      Contributions of cash, if required, as described in Section
                  4.1(e) of this Agreement.

         (e)      Contributions of cash, if required, as described in Section
                  4.1(f) of this Agreement:

(3)      Marathon Holding shall make or cause to be made Initial Capital
         Contributions equal to:

         (a)      Contribution of certain assets pursuant to the Contribution
                  Agreement between the Company and Marathon Holding of even
                  date herewith and at an Asset Value which amounts are
                  currently estimated to be $0.00.

         (b)      Contribution of amounts equal to the cash paid by Marathon
                  Holding and its Affiliates on behalf of the Company for
                  certain costs and expenses related to the formation of the
                  Company and incurred by Marathon Holding and its Affiliates
                  prior to the date hereof at an Asset Value of $510,000.

         (c)      Contribution of cash pursuant to Section 4.1(c) that are not
                  already covered under any other provisions of Section 4.1.

         (d)      Contributions of cash, if required, as described in Section
                  4.1(e) of this Agreement.


                                      A-2
<PAGE>   95

         (e)      Contributions, of cash if required, as described in Section
                  4.1(f) of this Agreement:

(4)      Initial Tax Matters Member.





                                      A-3
<PAGE>   96


                                    EXHIBIT B
                    CERTAIN MANTA RAY AND NAUTILUS FACILITIES

I.   Manta Ray Initial Facilities

     A.   Manta Ray Phase I Facilities

          1.   Pipeline Segments

               a.   Approximately 51 miles of 16" pipeline from Green Canyon
                    Block 29 to Ship Shoal Block 207.

               b.   Approximately 32 miles of 14" pipeline from South Timbalier
                    Block 301 to Ship Shoal Block 207.

               c.   Approximately 1 mile of 10" pipeline within Ship Shoal Block
                    240.

               d.   Approximately 3 miles of 12" pipeline from Ship Shoal Block
                    259 to Ship Shoal Block 261.

               e.   Approximately 6 miles of 16" pipeline from Ship Shoal Block
                    207 to Ship Shoal Block 181, to be contributed to the
                    Company by Poseidon Pipeline Company, L.L.C.

               f.   Approximately 6 miles of 12" pipeline from South Timbalier
                    Block 277 to South Timbalier Block 292.

               g.   Approximately 4 miles of 12" pipeline from South Timbalier
                    Block 292 to South Timbalier Block 280.

               h.   Approximately 18 miles of 24" pipeline from South Timbalier
                    Block 292 to South Timbalier Block 300.

               i.   Approximately 7 miles of 14" pipeline from Ship Shoal Block
                    332 to South Timbalier Block 301.

               j.   Approximately 7 miles of 16" pipeline from Ship Shoal Block
                    332 to South Timbalier Block 301.

               k.   Approximately 17 miles of 16" pipeline from Green Canyon
                    Block 19 to Ship Shoal Block 332.


                                      B-1
<PAGE>   97

l.   Approximately 9 miles of 16" pipeline from Ship Shoal Block 349 to Ewing
     Bank Block 990.

2.   Pipeline Related Facilities shall include :

     a.   GREEN CANYON 19A

          (1)  24" x 0.688" Riser with a 24" - 900# SDV

          (2)  20" x 16" Pig Launcher

          (3)  Corrosion Inhibitor Injection Skid with Sidewinder pump

          (4)  Dual 6" Orifice Meter Skid Design 1,720 psig @ 130(Degree) F

          (5)  Standard Gas Metering Station EFM Equipment

     b.   GREEN CANYON 18A

          (1)  Standard Gas Metering Station EFM Equipment

     c.   GREEN CANYON 65A

          (1)  Standard Gas Metering Station EFM Equipment

     d.   EWING BANK 947A

          (1)  Standard Gas Metering Station EFM Equipment

     e.   SHIP SHOAL 349A

          (1)  16" x 0.688" Riser with a 16" - 900# SDV

          (2)  18" x 16" Pig Launcher

          (3)  Corrosion Inhibitor Injection Skid with Sidewinder pump

          (4)  Dual 10" Orifice Meter Skid
               Design 1,550 psig @ 250(Degree) F

          (5)  Standard Gas Metering System EFM Equipment

     f.   SHIP SHOAL 240A

          SS240 Lateral is owned 51% by Manta Ray Gathering Company, L.L.C. and
          49% by ANR.

          (1)  10.75" x 0.594" Riser with 10" - 900# SDV

          (2)  12" x 10" Pig Launcher

          (3)  Corrosion Inhibitor Injection Skid with Sidewinder pump

          (4)  Dual 8" Orifice Meter Skid
               Design = 2,220 psig @ 100(Degree)F

          (5)  Standard Gas Metering Station EFM Equipment

          Manta Ray Offshore ownership is everything downstream of 6" - 900#
          flange at inlet of Gas Meter Skid.


                                      B-2
<PAGE>   98

     g.   SHIP SHOAL 259JA

          (1)  12.75" x 0.688" Riser with 12" - 900# SDV

          (2)  Corrosion Inhibitor Injection with Sidewinder pump

          (3)  Dual 10" Orifice Meter Skid Design = 1,480 psig @ 120(Degree)F

          Manta Ray Offshore ownership is everything downstream of 10" - 600#
          flange at inlet of Gas Meter Skid.

          Note: No pig launcher.

          EFM equipment is owned by William Field Services, who provide a
          monthly calibration service for a fee ($1,000).

     h.   SOUTH TIMBALIER 295A

          Manta Ray Offshore presently owns nothing on this platform. The Riser
          and Meter Station are owned by Shell Offshore Inc. The EFM equipment
          is owned by Williams Field Services who provides monthly calibration
          services for a fee ($1,000). When the 24" pipeline which originates at
          ST 292 is extended to SS 332 in 1997, Manta Ray will install its EFM
          equipment and remove Williams'. This will eliminate the fee.

     i.   SOUTH TIMBALIER 277A

          (1)  12.75" x 0.500" Riser

          (2)  14" x 12" Pig Launcher

          (3)  Corrosion Inhibitor Injection Skid with Sidewinder pump

          (4)  Single 8" Orifice Meter

          (5)  Barton Model 202E Chart Recorder

          (6)  Welker Model GS-4 Composite Gas Sampler

     j.   SOUTH TIMBALIER 300A

          (1)  24" x 0.625" Riser (inbound) with 24" - 900# SDV

          (2)  30" x 24" Pig Receiver

          (3)  Miscellaneous valves and fittings

     k.   SOUTH TIMBALIER 292A

          (1)  24" x 0.625" Riser (outbound) with a 24" - 900# SDV

          (2)  30" x 24" Pig Launcher

          (3)  Corrosion Inhibitor Injection Skid with Sidewinder Pump

          (4)  Dual 8" Orifice Meter

          (5)  12.75" x 0.500' Riser (outbound) with 12" - 600# SDV

          (6)  Corrosion Inhibitor Injection Skid with Sidewinder Pump

          (7)  Dual 10" Orifice Meter

          (8)  Welker Model GS-4 Composite Gas Sampler

          (9)  12.75" x 0.500" Riser (incoming) with 12" - 600# SDV

          (10) 14" x 12" Pig Receiver


                                      B-3
<PAGE>   99

     l.   SHIP SHOAL 207 DWPF

          (1)  8 Pile Platform

          (2)  16" x 0.625" Riser (inbound gas) with 16" - 900# SDV

          (3)  18" x 16" Pig Receiver

          (4)  H.P. Relief Scrubber

          (5)  L.P. Relief Scrubber

          (6)  Platform Sump System

          (7)  14" - 600# Check Valve, 14" - 600# FCV and (2) 14" 600# Block
               Valves

          (8)  (2) Bad Oil Tanks. Capacity = 1,200 BBL each

          (9)  (2) Waukesha - Pearce Generators 550 KW each

          (10) 14" x 0.625" Riser (inbound) with 14" - 900# SDV

          (11) 16" x 14" Pig Receiver

          (12) 16" x 0.406" Riser (outbound) with 16" - 600# SDV

          (13) 18" x 16" Pig Launcher

          (14) PECO Instrument Fuel Gas Filter

          (15) EFM Equipment (SS 207)

          (16) 8" Oil line which crosses bridge to platform

          (17) Seaking Series 42 Model SK 1900 Crane

          (18) 15' x 15' Parts Building

          Note: Oil Metering Skid and Prover Loop are property of Poseidon
          Pipeline Company, L.L.C.

     m.   SHIP SHOAL 332A

          (1)  16" x 0.562" Riser (inbound) with 16" - 900# SDV

          (2)  18" x -16" Pig Receiver

          (3)  12" - 1500# FCV, (2) 12" - 1500# Block Valves and 12" - 1500#
               Check valve allocated on Sub-Cellar Deck; 12" - 900# FCV and
               12" - 600# Check valve located on Sub-Cellar Deck; (2) 12" - 600#
               FCVs located on Cellar deck.

          (4)  20" Pipeline Manifold

          (5)  8" - 900# FCV

          (6)  Dual 12" and 10" Orifice Meter (to TGPL)

          (7)  18" x 16" Pig Launcher

          (8)  16" x 0.625" Riser (outbound) with 16" - 900# SDV

          (9)  16" x 14" Pig Launcher

          (10) 14" x 0.438" Riser (outbound) with 14" - 900# SDV

          (11) EFM Equipment (SS 332)

          (12) Certain Dehydration Facilities (as described in the relevant
               contribution agreement)

     n.   PARTS LISTS FOR METERING STATIONS

          (1)  Typical Gas Metering Station Installation (See Attachment 1.)

          (2)  Platform SS 207 (See Attachment 2.)

          (3)  Platform SS 332 (See Attachment 3.)

B.   Manta Ray Phase II Facilities

     1.   Pipeline Segments

          a.   Approximately 47 miles of 24" pipeline from Green Canyon Block 65
               to Ship Shoal Block 207.



                                      B-4
<PAGE>   100

                    b.   Approximately 7 miles of 24" pipeline from South
                         Timbalier Block 300 to Ship Shoal Block 332.

          2.   Pipeline Related Facilities

                    a.   A 24" export riser located on Shell Offshore Inc.'s
                         platform in Green Canyon Block 65.

                    b.   A 24" import riser located on Manta Ray Offshore
                         Gathering Company L.L.C.'s Ship Shoal 207 platforms.

                    c.   A 24" import riser located on Manta Ray Gathering
                         Company, L.L.C.'s Ship Shoal 332 platforms ("SS332
                         platforms").

                    d.   A slug catcher and related facilities located on the
                         SS207 platforms.

                    e.   A slug catcher and related facilities located at the
                         inlet of Exxon U.S.A's Garden City Gas Plant.

II.       Nautilus Initial Facilities

     A.   Pipeline Segments

          A 30" Pipeline from SS207 to the inlet of the Garden City Gas Plant,
          including a lateral to the Burns Point Gas Plant, risers, and other
          appurtenant facilities.

     B.   Pipeline Related Facilities

          A 30" export riser located on the Ship Shoal 207 platform.



                                      B-5
<PAGE>   101


                                    EXHIBIT C

                                    INSURANCE


Coverage                           Per Occurrence              Per Occurrence
                                Limit of Liability(1)            Deductible

I.       Each Member shall carry its proportionate share of the insurance in
         I.A. through D, in amounts equal to its Membership Interst, for its own
         benefit and the benefit of the Company, Ocean Breeze, Manta Ray and
         Nautilus. All deductible amounts shall be paid by the Company:

<TABLE>
<S>               <C>                                      <C>                       <C>
         A.       Physical Damage:                                                       $250,000

                  1.       a.  Pipelines                    $  20,000,000

                           b.  Junction Platform            $  15,000,000
                               (Section 207)

                  2.       Line Pack                        $     500,000

                  3.       Equipment                        $  10,000,000

                  4.       Cargo                            $   1,000,000

         B.       Excess Liability including Pollution      $ 200,000,000                $250,000
                  liability

         C.       Non-Owned Aircraft Liability              $  10,000,000                None

         D.       Builder's Risk(2)

                  1.  Manta Ray Phase II Facilities         Project Value                $500,000

                  2.  Nautilus Initial Facilities           Project Value                $200,000

II.      To be carried by the Company, if applicable:

         1.       Workers' Compensation                     Per statute                  None
                  Employers Liability/                      $   1,000,000                None
                  Maritime E.L.

         2.       Automobile Liability                      $   1,000,000                $250,000

III.     If the Company owns or bareboat charters watercraft these coverages will be carried by the Company:

         A.       Hull/Machinery, Including Collision       $  10,000,000                 $250,000
                  Liability

         B.       Protection & Indemnity, including crew    $   1,000,000                $250,000
                  coverage and Excess Collision Liability
</TABLE>



- --------

(1) Shell Seahorse Company shall have the right to self-insure for an amount
equal to the retention under Shell's corporate insurance program, subject to a
limit of $20,000,000. Marathon Gas Transmission, Inc. shall have the right to
self-insure for an amount equal to the retention under Marathon's corporate
insurance program, subject to a limit of $15,000,000 for physical damage and
pollution liability and $50,000,000 for other types of coverages.

(2) Builders Risk insurance or self-insurance shall be provided by each Member
in the form as reflected in the attached Builders Risk Specimen Policy.

                                      C-1

<PAGE>   1

                                                                   EXHIBIT 10.16


                       LIMITED LIABILITY COMPANY AGREEMENT

                                       OF

                      OCEAN BREEZE PIPELINE COMPANY, L.L.C.

                     (A DELAWARE LIMITED LIABILITY COMPANY)

                         (DATED AS OF JANUARY 17, 1997)




<PAGE>   2


                                TABLE OF CONTENTS


<TABLE>
<S>                                                                                                           <C>
ARTICLE I. DEFINITIONS............................................................................................1
         1.1     SPECIFIC DEFINITIONS.............................................................................1
         1.2     OTHER TERMS.....................................................................................16
         1.3     CONSTRUCTION....................................................................................16

ARTICLE II. ORGANIZATION.........................................................................................17
         2.1     FORMATION.......................................................................................17
         2.2     NAME............................................................................................17
         2.3     PRINCIPAL OFFICE IN THE UNITED STATES; OTHER OFFICES............................................17
         2.4     PURPOSE.........................................................................................17
         2.5     FOREIGN QUALIFICATION...........................................................................17
         2.6     TERM............................................................................................17
         2.7     MERGERS AND EXCHANGES...........................................................................17
         2.8     BUSINESS OPPORTUNITIES--NO IMPLIED DUTY OR OBLIGATION...........................................17

ARTICLE III. MEMBERSHIP INTERESTS AND TRANSFERS..................................................................18
         3.1     INITIAL MEMBERS.................................................................................18
         3.2     NUMBER OF MEMBERS...............................................................................18
         3.3     MEMBERSHIP INTERESTS............................................................................18
         3.4     REPRESENTATIONS AND WARRANTIES..................................................................18
         3.5     RESTRICTIONS ON THE TRANSFER OF A MEMBERSHIP INTEREST...........................................19
         3.6     TRANSFER RESTRICTIONS...........................................................................21
         3.7     DOCUMENTATION; VALIDITY OF TRANSFER.............................................................24
         3.8     [RESERVED]......................................................................................24
         3.9     POSSIBLE ADDITIONAL RESTRICTIONS ON TRANSFER....................................................24
         3.10    ADDITIONAL MEMBERSHIP INTERESTS.................................................................24
         3.11    CODE SECTION 708 TRANSFERS......................................................................25
         3.12    INFORMATION.....................................................................................25
         3.13    LIABILITY TO THIRD PARTIES......................................................................26
         3.14    RESIGNATION.....................................................................................26
         3.15    LACK OF MEMBER AUTHORITY........................................................................26
         3.16    [RESERVED]......................................................................................26
         3.17    FAILURE TO ACCEPT NAUTILUS CONSTRUCTION CERTIFICATE.............................................26
         3.18    OTHER CONTINGENCIES.............................................................................27

ARTICLE IV. CAPITAL CONTRIBUTIONS................................................................................30
         4.1     INITIAL CAPITAL CONTRIBUTIONS...................................................................30
         4.2     SUBSEQUENT CONTRIBUTIONS........................................................................30
         4.3     FAILURE TO CONTRIBUTE...........................................................................30
         4.4     RETURN OF CONTRIBUTIONS.........................................................................33
         4.5     CAPITAL ACCOUNTS................................................................................33
</TABLE>

                                        i

<PAGE>   3


<TABLE>
<S>                                                                                                           <C>
ARTICLE V. ALLOCATIONS AND DISTRIBUTIONS.........................................................................36
         5.1     ALLOCATIONS FOR CAPITAL ACCOUNT PURPOSES........................................................36
         5.2     ALLOCATIONS FOR TAX PURPOSES....................................................................38
         5.3     REQUIREMENT OF DISTRIBUTIONS....................................................................40
         5.4     PRO RATA DISTRIBUTIONS..........................................................................40
         5.5     RESERVES........................................................................................40
         5.6     DISTRIBUTION RESTRICTIONS.......................................................................40
         5.7     SPECIAL DISTRIBUTIONS AND CONTRIBUTIONS.........................................................40


ARTICLE VI. MANAGEMENT OF THE COMPANY............................................................................41
         6.1     MANAGEMENT BY THE MEMBERS AND DELEGATION OF AUTHORITY...........................................41
         6.2     COMMITTEES......................................................................................41
         6.3     AUTHORITY OF MEMBERS AND COMMITTEES.............................................................41
         6.4     OFFICERS........................................................................................43
         6.5     DUTIES OF OFFICERS..............................................................................45
         6.6     NO DUTY TO CONSULT..............................................................................45
         6.7     REIMBURSEMENT...................................................................................45
         6.8     MEMBERS AND AFFILIATES DEALING WITH THE COMPANY.................................................45
         6.9     INSURANCE.......................................................................................45


ARTICLE VII. MEETINGS............................................................................................46
         7.1     MEETINGS OF MEMBERS AND COMMITTEES..............................................................46
         7.2     SPECIAL ACTIONS.................................................................................47
         7.3     VOTING LIST.....................................................................................50
         7.4     PROXIES.........................................................................................50
         7.5     VOTES...........................................................................................51
         7.6     CONDUCT OF MEETINGS.............................................................................51
         7.7     ACTION BY WRITTEN CONSENT.......................................................................51
         7.8     RECORDS.........................................................................................52


ARTICLE VIII. INDEMNIFICATION....................................................................................52
         8.1     RIGHT TO INDEMNIFICATION........................................................................52
         8.2     INDEMNIFICATION OF OFFICERS, EMPLOYEES AND AGENTS...............................................53
         8.3     ADVANCE PAYMENT.................................................................................53
         8.4     APPEARANCE AS A WITNESS.........................................................................53
         8.5     NONEXCLUSIVITY OF RIGHTS........................................................................53
         8.6     INSURANCE.......................................................................................53
         8.7     MEMBER NOTIFICATION.............................................................................53
         8.8     SAVINGS CLAUSE..................................................................................54
         8.9     SCOPE OF INDEMNITY..............................................................................54


ARTICLE IX. TAXES................................................................................................54
         9.1     TAX RETURNS.....................................................................................54
         9.2     TAX ELECTIONS...................................................................................54
         9.3     TAX MATTERS MEMBER..............................................................................54


ARTICLE X. BOOKS, RECORDS, REPORTS, AND BANK ACCOUNTS............................................................55
         10.1    MAINTENANCE OF BOOKS............................................................................55
         10.2    FINANCIAL STATEMENTS............................................................................55
</TABLE>

                                       ii

<PAGE>   4

<TABLE>
<S>                                                                                                           <C>
         10.3    TAX STATEMENTS..................................................................................55
         10.4    ACCOUNTS........................................................................................55


ARTICLE XI. BANKRUPTCY OF A MEMBER...............................................................................56
         11.1    BANKRUPT MEMBERS................................................................................56


ARTICLE XII. DISSOLUTION, LIQUIDATION, AND TERMINATION...........................................................57
         12.1    DISSOLUTION.....................................................................................57
         12.2    LIQUIDATION AND TERMINATION.....................................................................57
         12.3    PROVISION FOR CONTINGENT CLAIMS.................................................................59
         12.4    DEFICIT CAPITAL ACCOUNTS........................................................................59


ARTICLE XIII. AMENDMENT OF THE AGREEMENT.........................................................................60
         13.1    AMENDMENTS TO BE ADOPTED BY THE COMPANY.........................................................60
         13.2    AMENDMENT PROCEDURES............................................................................60


ARTICLE XIV. CERTIFICATED MEMBERSHIP INTERESTS...................................................................61
         14.1    ENTITLEMENT TO CERTIFICATES.....................................................................61
         14.2    MULTIPLE CLASSES OF INTEREST....................................................................61
         14.3    SIGNATURES......................................................................................61
         14.4    ISSUANCE AND PAYMENT............................................................................61
         14.5    RESTRICTIVE LEGEND..............................................................................61
         14.6    LOST, STOLEN OR DESTROYED CERTIFICATES..........................................................62
         14.7    TRANSFER OF MEMBERSHIP INTEREST.................................................................62
         14.8    REGISTERED HOLDERS..............................................................................62


ARTICLE XV. OTHER MEMBER AGREEMENTS AND OBLIGATIONS..............................................................62
         15.1    LATERAL OPPORTUNITIES...........................................................................62
         15.2    EXPANSIONS......................................................................................64
         15.3    CERTAIN PROPERTIES..............................................................................66


ARTICLE XVI. GENERAL PROVISIONS..................................................................................67
         16.1    OFFSET..........................................................................................67
         16.2    ENTIRE AGREEMENT; SUPERSEDURE...................................................................67
         16.3    WAIVERS.........................................................................................67
         16.4    BINDING EFFECT..................................................................................67
         16.5    MEMBER DEADLOCKS; NEGOTIATIONS AND MEDIATION....................................................67
         16.6    GOVERNING LAW; SEVERABILITY.....................................................................68
         16.7    FURTHER ASSURANCES..............................................................................69
         16.8    EXERCISE OF CERTAIN RIGHTS......................................................................69
         16.9    NOTICE TO MEMBERS OF PROVISIONS OF THIS AGREEMENT...............................................70
         16.10   COUNTERPARTS....................................................................................70
         16.11   ATTENDANCE VIA COMMUNICATIONS EQUIPMENT.........................................................70
         16.12   REPORTS TO MEMBERS..............................................................................70
         16.13   CHECKS, NOTES AND CONTRACTS.....................................................................70
         16.14   SEAL............................................................................................70
         16.15   BOOKS AND RECORDS...............................................................................70
         16.16   SURETY BONDS....................................................................................71
         16.17   AUDIT RIGHTS OF MEMBERS.........................................................................71
</TABLE>

                                      iii

<PAGE>   5

<TABLE>
<S>                                                                                                           <C>
         16.18   NO THIRD PARTY BENEFICIARIES....................................................................71
         16.19   NOTICES.........................................................................................71
         16.20   REMEDIES........................................................................................72
         16.21   DISPUTES........................................................................................72
         16.22   NO SHOP.........................................................................................75
         16.23   MEMBER TRADEMARKS...............................................................................76
         16.24   HOLDING-OUT.....................................................................................76
</TABLE>


                                       iv

<PAGE>   6


                       LIMITED LIABILITY COMPANY AGREEMENT


                                       OF

                      OCEAN BREEZE PIPELINE COMPANY, L.L.C.
                     (A DELAWARE LIMITED LIABILITY COMPANY)


         This Limited Liability Company Agreement of Ocean Breeze Pipeline
Company, L.L.C., dated as of January 17, 1997 (the "Formation Date"), is (a)
adopted by the Members (as defined below) and (b) executed and agreed to, for
good and valuable consideration, by the Members.

         WHEREAS, the Members desire to form the Company (defined below) in
connection with the acquisition, construction, ownership and operation of
certain pipelines;

         WHEREAS, the Company will own interests in Manta Ray Offshore Gathering
Company, L.L.C. ("Manta Ray") and Nautilus Pipeline Company, L.L.C.
("Nautilus"); and

         WHEREAS, Manta Ray and Nautilus will acquire, construct, own and
operate the Manta Ray System and the Nautilus System (each defined below),
respectively.

         NOW, THEREFORE, for and in consideration of the premises and the mutual
covenants and agreements contained herein and other good and valuable
consideration (the receipt and sufficiency of which are hereby confirmed and
acknowledged), the parties hereto hereby stipulate and agree as follows:


                                   ARTICLE I.
                                  DEFINITIONS

         1.1 SPECIFIC DEFINITIONS. As used in this Agreement, the following
terms have the following meanings:

                  "Accelerated Volumes" means the increment of natural gas
         volumes produced from existing, flowing Dedicated Leases which require
         a Major Expansion Project pursuant to Section 15.2, provided that such
         volumes, for the purposes of this definition, shall be limited to
         Dedicated Leases from which the increases in volume are attributable to
         an acceleration of reserves production, and not an increase in overall
         reserves.

                  "Accessible Capacity" means that portion of the Base Capacity
         which is commercially useable for gas gathering or transportation
         taking into consideration hydraulics, geographic proximity and other
         similar factors to transport relevant Expansion Property Production.

                  "Act" means the Delaware Limited Liability Company Act and any
         successor statute, as amended from time to time.

<PAGE>   7

                  "Adjusted Capital Account" means the Capital Account
         maintained for each Member as of the end of each taxable year of the
         Company, (a) increased by any amounts that such Member is obligated to
         restore under the standards set by Treasury Regulation section
         1.704-1(b)(2)(ii)(c) (or is deemed obligated to restore pursuant to the
         penultimate sentences of Treasury Regulation sections 1.704-2(g)(1) and
         1.704-2(i)(5)), and (b) decreased by (i) the amount of all losses and
         deductions that, as of the end of such taxable year, are reasonably
         expected to be allocated to such Member in subsequent years under
         sections 704(e)(2) and 706(d) of the Code and Treasury Regulation
         section 1.751-1(b)(2)(ii), and (ii) the amount of all distributions
         that, as of the end of such taxable year, are reasonably expected to be
         made to such Member in subsequent years in accordance with the terms of
         this Agreement or otherwise to the extent they exceed offsetting
         increases to such Member's Capital Account that are reasonably expected
         to occur during (or prior to) the year in which such distributions are
         reasonably expected to be made (other than increases as a result of a
         minimum chargeback pursuant to Section 5.1(d) or 5.1(e)). The foregoing
         definition of Adjusted Capital Account is intended to comply with the
         provisions of Treasury Regulation section 1.704-1(b)(2)(ii)(d) and
         shall be interpreted consistently therewith.

                  "Adjusted Property" means any property, the Carrying Value of
         which has been adjusted pursuant to Section 4.5(a) and (d). Once an
         Adjusted Property is deemed distributed by, and recontributed to, the
         Company for federal income tax purposes upon a termination thereof
         pursuant to section 708 of the Code, such property shall thereafter
         constitute a Contributed Property until the Carrying Value of such
         property is further adjusted pursuant to Section 4.5.

                  "Affiliate" means, with respect to any relevant Person, any
         other Person that directly or indirectly controls, is controlled by, or
         is under common control with, such relevant Person in question. As used
         herein, the term "control" (including its derivatives and similar
         terms) means owning, directly or indirectly, the power (i) to vote ten
         percent (10%) or more of the Voting Stock of any such relevant Person
         or (ii) to direct or cause the direction of the management and policies
         of any such relevant Person.

                  "Agreement" means this Limited Liability Company Agreement
         (including any schedules, exhibits or attachments hereto), as amended,
         supplemented or modified from time to time.

                  "Arbitrator" has the meaning given that term in Section 16.21.

                  "Arbitration Notice" has the meaning given that term in
         Section 16.21.

                  "Asset Value" of any Contributed Property means the fair
         market value of such property or other consideration at the time of
         contribution as determined by the Company using such reasonable method
         of valuation as it may adopt. The Company shall, in its sole
         discretion, use such method as it deems reasonable and appropriate to
         allocate the aggregate Asset Value of Contributed Properties in a
         single or integrated transaction among such properties on a basis
         proportional to their fair market value. The fair market


                                       2
<PAGE>   8

         value of the Contributed Properties described on Exhibit A shall be
         deemed to be the Asset Value of such Contributed Properties set forth
         therein.

                  "Available Cash" means unrestricted cash and cash equivalents
         of the Company less reasonable cash reserves, including, without
         limitation, those necessary for working capital and obligations or
         other contingencies of the Company. Available Cash shall not include
         any Initial Capital Contributions except to the extent that all of the
         Members agree that the applicable portion of any such Initial Capital
         Contribution is no longer needed to finance the construction of the
         Manta Ray Initial Facilities and the Nautilus Initial Facilities.

                  "Bankrupt Member" means any Member:

                  (a) that (i) makes a general assignment for the benefit of
         creditors; (ii) files a voluntary bankruptcy petition; (iii) becomes
         the subject of an order for relief or is declared insolvent in any
         federal or state bankruptcy or insolvency proceeding; (iv) files a
         petition or answer seeking for the Member a reorganization,
         arrangement, composition, readjustment, liquidation, dissolution, or
         similar relief under any law; (v) files an answer or other pleading
         admitting or failing to contest the material allegations of a petition
         filed against the Member in a proceeding of the type described in
         subclauses (i) through (iv) of this clause (a); or (vi) seeks,
         consents, or acquiesces to the appointment of a trustee, receiver, or
         liquidator of the Member or of all or any substantial part of the
         Member's properties; or

                  (b) against which a proceeding seeking reorganization,
         arrangement, composition, readjustment, liquidation, dissolution, or
         similar relief under any law has been commenced and 90 days have
         expired without dismissal thereof or with respect to which, without the
         Member's consent or acquiescence, a trustee, receiver, or liquidator of
         the Member or of all or any substantial part of the Member's properties
         has been appointed and 60 days have expired without such appointments
         having been vacated or stayed, or 60 days have expired after the date
         of expiration of a stay, if the appointment has not previously been
         vacated.

                  "Base Capacity" means the maximum throughput capacity on the
         Manta Ray System or the Nautilus System, as applicable, immediately
         before the commencement of the relevant Major Expansion Project and any
         additional capacity thereafter created by any succeeding Major
         Expansion Project approved by Members holding at least the applicable
         Required Interest or, pursuant to Section 15.2, for which payout has
         occurred.

                  "Book-Tax Disparity" means with respect to any item of
         Contributed Property or Adjusted Property, as of the date of any
         determination, the difference between the Carrying Value of such
         Contributed Property or Adjusted Property and the adjusted basis
         thereof for federal income tax purposes as of such date. A Member's
         share of the Company's Book-Tax Disparities in all of its Contributed
         Property and Adjusted Property will be reflected by the difference
         between such Member's Capital Account balance as


                                       3
<PAGE>   9

         maintained pursuant to Section 4.5 and the hypothetical balance of such
         Member's Capital Account computed as if it had been maintained strictly
         in accordance with federal income tax accounting principles. The
         determination of Book-Tax disparity and a Member's share thereof shall
         be determined consistently with section 1.704-3(c) of the Treasury
         Regulations.

                  "Boxer Line" means a 12 inch pipeline owned by Shell Holding
         or its Affiliate running approximately eight miles from Green Canyon
         Block 65 to Green Canyon Block 19, and all related facilities,
         including, but not limited to, platform risers.

                  "Boxer Line Special Condition" means any condition, occurrence
         or event which is (i) caused by the gross negligence or willful
         misconduct of the Company, Neptune, Manta Ray or any Persons selected
         to operate the Boxer Line or (ii) covered by Manta Ray's insurance.

                  "Boxer Line Stub Period Income" means, with respect to the
         period beginning on the date hereof and ending on the Reconciliation
         Date, all Boxer Line Stub Period Revenues less all Boxer Line Stub
         Period Expenses.

                  "Boxer Line Stub Period Revenues" means, with respect to the
         period beginning on the date hereof and ending on the Reconciliation
         Date and without duplication, 100% of all operating revenues, gains and
         income from all operations attributable to the Boxer Line to the extent
         derived from any contract, agreement or similar arrangement in
         existence prior to the Formation Date.

                  "Boxer Line Stub Period Expenses" means, with respect to the
         period beginning on the date hereof and ending on the Reconciliation
         Date and without duplication, 100% of all cash operating expenses
         (including, without limitation, the cost of insurance), non-cash
         expenses, such as depreciation and amortization and the cost of repairs
         (including Shell Major Repairs) from all operations attributable to the
         Boxer Line except to the extent attributable to a Boxer Line Special
         Condition.

                  "Business Day" means Monday through Friday of each week,
         except that a legal holiday recognized as such by the government of the
         United States or the State of Texas shall not be regarded as a Business
         Day.

                  "Capacity Request" has the meaning given that term in Section
         15.2.

                  "Capital Account" means the capital account maintained for
         each Member pursuant to Section 4.5 herein.

                  "Capital Contribution" means any contribution by a Member to
         the capital of the Company, as contemplated by Section 4.5(a).

                  "Carrying Value" means (a) with respect to Contributed
         Property, the Asset Value of such property reduced (but not below zero)
         by all depreciation, amortization and cost recovery deductions relating
         to such property charged to the Members' Capital Accounts,


                                       4
<PAGE>   10

         and (b) with respect to any other Company property, the adjusted basis
         of such property for federal income tax purposes, all as of the time of
         determination. The Carrying Value of any property shall be adjusted
         from time to time in accordance with Sections 4.5(d)(i), (d)(ii), and
         (d)(iii) and to reflect changes, additions or other adjustments to the
         Carrying Value for dispositions and acquisitions of Company properties,
         as deemed appropriate by the Company.

                  "Certificate" has the meaning given that term in Section 2.1.

                  "Code" means the Internal Revenue Code of 1986 and any
         successor statute, as amended from time to time.

                  "Company" means Ocean Breeze Pipeline Company, L.L.C., a
         Delaware limited liability company.

                  "Company Minimum Gain" means the amount determined pursuant to
         Treasury Regulation section 1.704-2(d).

                  "Construction Agreements" means (i) the Construction
         Management Agreement between Shell Holding and Manta Ray, (ii) the
         Construction Management Agreement between Marathon Holding and Manta
         Ray, and (iii) the Construction Management Agreement between Marathon
         Holding, and Nautilus.

                  "Construction Certificate" has the meaning given that term in
         Section 3.17.

                  "Contribution Agreement" means each Contribution Agreement of
         even date herewith between the Company, on the one hand, and the
         Members or their Affiliates, on the other hand.

                  "Contributed Property" means each property or other asset, in
         such form as may be permitted by the Act, but excluding cash or cash
         equivalents, contributed to the Company (or deemed contributed to the
         Company on termination and reconstitution thereof pursuant to section
         708 of the Code). Once the Carrying Value of a Contributed Property is
         adjusted pursuant to Section 4.5(d), such property shall no longer
         constitute a Contributed Property for purposes of Section 5.2, but
         shall be deemed an Adjusted Property for such purposes.

                  "Costs" has the meaning given that term in Section
         4.3(a)(ii)(3).

                  "CPR Institute" has the meaning given that term in Section
         3.6(e).

                  "Dedication Agreements" means, collectively, (a) the Gas
         Gathering Agreements between (i) Shell Offshore Inc., Shell Deepwater
         Development Inc., and Shell Deepwater Production Inc. and Manta Ray,
         (ii) Marathon Oil Company and Manta Ray, (b) the Precedent Agreements
         relating to the Dedicated Leases, each dated as of even date herewith,
         between (i) Shell Offshore Inc., Shell Deepwater Development Inc., and
         Shell Deepwater Production Inc. and Nautilus, (ii) Marathon Oil Company
         and


                                       5
<PAGE>   11

         Nautilus, (c) the Service Agreements for Firm Transportation Service
         Under Rate Schedule FT-2 related to the Precedent Agreements described
         in (b) above, and (d) the Reserve Dedication and Discount Rate
         Agreements, each dated as of even date herewith, between (i) Shell
         Offshore Inc., Shell Deepwater Development Inc., Shell Deepwater
         Production Inc. and Nautilus and (ii) Marathon Oil Company and Nautilus
         each individually a "Dedication Agreement."

                  "Dedicated Leases" means all oil, gas and mineral leases
         certain of the production from which is dedicated pursuant to any
         Dedication Agreement.

                  "Default" means, in respect of any Member, upon the occurrence
         and during the continuation of any of the following events:

                           (a) the failure to remedy, within seven Business Days
                  of such Member's receipt of written notice thereof from the
                  Company or any other Member, a Member's delinquency in making
                  any Capital Contribution to the Company as required pursuant
                  to Section 4.1 or 4.2;

                           (b) the occurrence of any event that causes such
                  Member to become a Bankrupt Member; or

                           (c) the failure to remedy, within ten Business Days
                  of receipt of written notice thereof from the Company or any
                  other Member, the non-performance of or non-compliance with
                  any other material agreements, obligations or undertakings of
                  such Member contained in this Agreement or of such Member or
                  any of its Affiliates contained in any Contribution Agreement
                  if such non-performance or non-compliance with such
                  Contribution Agreement could reasonably be expected to result
                  in Losses to the Company of at least $1,000,000, in the
                  aggregate.

                  "Default Interest Rate" means a rate per annum, compounded
         monthly, equal to the lesser of (a) 4% plus the one year LIBOR rate
         quoted in the Wall Street Journal (or, in its absence, a similar
         publication) on the first day of the applicable month, and (b) the
         maximum rate permitted by applicable laws.

                  "Delinquent Member" has the meaning given that term in Section
         4.3(a).

                  "Dispute" has the meaning given that term in Section 16.21.

                  "Disputing Party" has the meaning given that term in Section
         16.21.

                  "Economic Risk of Loss" has the meaning set forth in Treasury
         Regulation section 1.752-2(a).

                  "Eligible Citizen" means a Person qualified to hold leases,
         rights-of-way, permits, licenses or other similar agreements or
         documents issued by or entered into with the United States government,
         and whose status as a Member or Transferee does not or


                                       6
<PAGE>   12

         would not subject the Company to a substantial risk of cancellation or
         forfeiture of any such lease, right-of-way, permit, license or other
         similar agreement or document issued by or entered into with the United
         States government. As of the date hereof, "Eligible Citizen" means (a)
         a citizen of the United States, (b) an association (including a
         partnership, joint tenancy in common) organized or existing under the
         Laws of the United States or any state or territory thereof, all of the
         members of which are citizens of the United States (c) a corporation
         organized under the Laws of the United States or of any state or
         territory thereof, or (d) a limited liability company organized under
         the Laws of the United States or any state or territory thereof, not
         more than five percent of the voting stock, or of all the stock, of
         which corporation, to the best of its knowledge, is owned or controlled
         by citizens of countries that deny to United States citizens privileges
         to own stock in corporations holding oil and gas leases similar to the
         privileges of non-United States citizens to own stock in corporations
         holding an interest in oil and gas leases on federal lands.

                  "Exercising Member" has the meaning given that term in Section
         15.2.

                  "Expanded Capacity" means, with respect to a relevant Major
         Expansion Project, the additional throughput capacity created on the
         Manta Ray System or the Nautilus System, as applicable, as a result of
         such relevant Major Expansion Project built pursuant to Section 15.2.

                  "Expanded Capacity Revenues" means revenues from gathering
         services, if such expansion relates to the Manta Ray System, or from
         transportation services, if such expansion relates to the Nautilus
         System, and from any other services provided by the relevant Subsidiary
         of the Company attributable to the Expanded Capacity Volumes.

                  "Expanded Capacity Volumes" means, for the relevant month, the
         lesser of (i) the Expanded Capacity or (ii) the sum of Expansion
         Property Production and Incremental Volumes.

                  "Expansion Liquidation Value" has the meaning given that term
         in Section 12.2(c).

                  "Expansion Option" has the meaning given that term in Section
         15.2.

                  "Expansion Option Notice" has the meaning given that term in
         Section 15.2.

                  "Expansion Option Period" has the meaning given that term in
         Section 15.2.

                  "Expansion Property" has the meaning given that term in
         Section 15.2.

                  "Expansion Property Production" has the meaning given that
         term in Section 15.2.

                  "FERC" means the Federal Energy Regulatory Commission or any
         successor or replacement Person.


                                       7
<PAGE>   13


                  "FERC Certificate" means the initial Certificate of Public
         Convenience and Necessity authorizing Nautilus to provide
         transportation services on the Nautilus System and approving the
         initial rates, terms and conditions of service.

                  "Foreclosure Transfer" means any Transfer resulting from any
         judicial or non-judicial foreclosure by the holder of a Security
         Interest or any Transfer to the holder of a Security Interest in
         connection with a workout or similar arrangement or any transfer from
         the holder of a Security Interest.

                  "Formation Date" has the meaning given that term in the
         preamble.

                  "GAAP" means generally accepted accounting principles,
         consistently applied.

                  "Gas Contract" means any contract, agreement or other
         obligation of any of the Company, Manta Ray or Nautilus to purchase
         fuel gas, buy or sell linepack gas or transport, exchange, gather,
         process or otherwise handle natural gas.

                  "General Interest Rate" means a rate per annum, compounded
         monthly, equal to the lesser of (a) the sum of the one year LIBOR rate
         quoted in the Wall Street Journal (or, in its absence, a similar
         publication) on the first day of the applicable month plus one percent
         and (b) the maximum rate permitted by applicable laws.

                  "Incremental Volumes" means, with respect to a relevant month,
         the aggregate volumes gathered or transported by the Manta Ray System
         or the Nautilus System, as applicable, in excess of the Base Capacity,
         plus the relevant Expansion Property Production; provided, however,
         that the Incremental Volumes shall be applied to Major Expansion
         Projects which have not paid out pursuant to Section 15.2 in
         chronological order of completion.

                  "Initial Capital Contribution" has the meaning given that term
         in Section 4.1 herein.

                  "Lateral" means any newly constructed natural gas pipeline,
         lateral, segment or extension that directly connects or is proposed to
         directly connect to the Company's (or any of its Subsidiaries') then
         existing natural gas pipelines, laterals, segments or extensions.

                  "Lateral Connection Point" means, (i) with respect to any
         proposed natural gas pipeline, lateral, segment or extension that is
         proposed to connect one or more wells to the Company's (or its
         Subsidiary's) existing pipelines, laterals, segments or extensions, the
         closest and most practical connection point or points, taking into
         account the location of the relevant well or wells and the Company's
         (or its Subsidiaries') existing pipelines, laterals or segments, where
         sufficient capacity for gas to be produced from wells connected to such
         proposed pipeline, lateral or segment is available (or could be made
         available by acquiring, constructing or otherwise obtaining additional
         facilities in accordance with the terms of Section 7.2 or Section 15.2)
         or (ii) any other mutually agreeable interconnection point.


                                       8
<PAGE>   14

                  "Lateral Opportunity" has the meaning given that term in
         Section 15.1.

                  "Lateral Opportunity Notice" has the meaning given that term
         in Section 15.1.

                  "Laws" means the laws, rules, regulations, decrees and orders
         of the United States of America and all other governmental authorities
         having jurisdiction, whether such Laws now exist or hereafter come into
         effect.

                  "Leviathan Gas Pipeline Companies" means Leviathan Gas
         Pipeline Partners, L.P. and any direct or indirect Subsidiary thereof.

                  "Leviathan Holding" means Sailfish Pipeline Company, L.L.C.

                  "Leviathan Major Repairs" means all repairs resulting from
         Losses to the Manta Ray Phase I Facilities prior to the Reconciliation
         Date, except to the extent such Losses result from or constitute a
         Manta Ray Special Condition.

                  "Leviathan Reconciliation Date Income" has the meaning given
         that term in Section 4.5(c)(iii).

                  "Lending Member" has the meaning given that term in Section
         4.3(a)(ii).

                  "Liquidator" has the meaning given that term in Section 12.2.

                  "Loss" or "Losses" means, subject to the limitations set forth
         in Section 16.20, any actions, claims, settlements, judgments, demands,
         liens, losses, damages, fines, penalties, interest, costs, expenses
         (including, without limitation, expenses attributable to the defense of
         any actions or claims), attorneys' fees and liabilities.

                  "Major Expansion Project" means, other than a Lateral which
         connects at a Lateral Connection Point, any physical enhancement or
         series of physical enhancements which would increase the Base Capacity
         of any then existing pipeline, lateral, segment, extension or other
         significant natural gas handling facility owned, leased or otherwise
         controlled by the Company, Nautilus or Manta Ray, including, without
         limitation, adding compression to one or more existing pipelines,
         laterals, segments or extensions or constructing a new pipeline,
         lateral, segment or extension (which does not constitute a Lateral
         which connects at a Lateral Connection Point).

                  "Majority Interest" means, subject to and in accordance with
         Section 7.5, any Member (together with its Affiliated Members) and at
         least one other non-Affiliated Member having among them more than 50%
         of the Membership Interests of all Members; provided, however, any
         single Member (together with its Affiliated Members) shall constitute a
         "Majority Interest" only if such Member (together with its Affiliated
         Members) owns at least 76% of the Membership Interest of all of the
         Members.

                  "Manta Ray" means Manta Ray Offshore Gathering Company, L.L.C.


                                       9
<PAGE>   15

                  "Manta Ray Initial Facilities" means the Manta Ray Phase I
         Facilities, the Manta Ray Phase II Facilities and the Boxer Line.

                  "Manta Ray Phase I Facilities" means those assets, other than
         cash, contributed as of even date herewith by Poseidon Pipeline
         Company, L.L.C. and Manta Ray Gathering Company, L.L.C., as more
         particularly described in part I.A. of "Exhibit B."

                  "Manta Ray Phase II Facilities" means the natural gas
         pipelines and related facilities described in Part I.B. of Exhibit B
         and to be constructed pursuant to that certain Construction Agreement
         dated as of even date herewith between Manta Ray and Shell Holding and
         the Construction Agreement between Marathon Holding and Manta Ray.

                  "Manta Ray Special Condition" means any condition, occurrence
         or event which is (i) caused by the gross negligence or willful
         misconduct of the Company, Neptune, Manta Ray or any Person selected to
         operate the Manta Ray Phase I Facilities or (ii) covered by Manta Ray's
         insurance.

                  "Manta Ray Stub Period Income" means, with respect to the
         period beginning on the date hereof and ending on the Reconciliation
         Date, all Manta Ray Stub Period Revenues less all Manta Ray Stub Period
         Expenses.

                  "Manta Ray Stub Period Revenues" means, with respect to the
         period beginning on the date hereof and ending on the Reconciliation
         Date and without duplication, 100% of all operating revenues, gains and
         income from all operations attributable to the Manta Ray Phase I
         Facilities except to the extent related to New Business.

                  "Manta Ray Stub Period Expenses" means, with respect to the
         period beginning on the date hereof and ending on the Reconciliation
         Date and without duplication, 100% of all cash operating expenses
         (including, without limitation, the cost of insurance), non-cash
         expenses, such as depreciation and amortization and the cost of repairs
         (including Leviathan Major Repairs) from all operations attributable to
         the Manta Ray Phase I Facilities except to the extent attributable to
         (i) New Business or (ii) a Manta Ray Special Condition.

                  "Manta Ray System" means the Manta Ray Initial Facilities and
         any other natural gas pipelines and related facilities constructed,
         purchased or otherwise acquired by Manta Ray in accordance with the
         terms and conditions of this Agreement and Manta Ray's Limited
         Liability Company Agreement.

                  "Marathon Gas Pipeline Companies" means (i) Marathon Pipe Line
         Company, (ii) Marathon Holding and (iii) any direct or indirect
         Subsidiaries of (i) and (ii).

                  "Marathon Holding" means Marathon Gas Transmission Inc.

                  "Member" means any Person executing this Agreement as of even
         date herewith as a Member or any Person hereafter admitted to the
         Company as an additional Member


                                       10
<PAGE>   16

         or Substituted Member as provided in this Agreement, but does not
         include any Person who has ceased to be a Member in the Company.

                  "Membership Interest" means, subject to and in accordance with
         Section 7.5, the ownership interest (on a percentage basis) of a Member
         in the Company, including, without limitation, rights to distributions
         (liquidating or otherwise), allocations, information, and to consent or
         approve, which ownership interest is more particularly described and
         identified in Article III and Exhibit A.

                  "Minimum Gain Attributable to Member Nonrecourse Debt" means
         that amount determined in accordance with the principles of Treasury
         Regulation section 1.704 2(i)(3).

                  "NGA" means the Natural Gas Act of 1938, as amended from time
         to time.

                  "Nautilus" means Nautilus Pipeline Company, L.L.C.

                  "Nautilus Initial Facilities" means the natural gas pipelines
         and related facilities as more particularly described in Part II of
         Exhibit B and to be constructed pursuant to that certain Construction
         Agreement dated as of even date herewith between Nautilus and Marathon
         Holding.

                  "Nautilus System" means the Nautilus Initial Facilities, and
         any other natural gas pipelines and related facilities constructed,
         purchased or otherwise acquired by Nautilus in accordance with the
         terms and conditions of this Agreement and Nautilus' Limited Liability
         Company Agreement.

                  "Neptune" means Neptune Pipeline Company, L.L.C.

                  "Net Asset Value" means (a) in the case of any Contributed
         Property, the fair market value of such property reduced by any
         liabilities either assumed by the Company upon such contribution or to
         which such property is subject when contributed; provided, however, the
         fair market value of the Contributed Property described on Exhibit A
         shall be deemed to be the Asset Value of such Contributed Property set
         forth therein, and (b) in the case of any property distributed to a
         Member or Transferee by the Company, the Company's Carrying Value of
         such property at the time such property is distributed, reduced by any
         indebtedness either assumed by such Member or Transferee upon such
         distribution or to which such property is subject at the time of
         distribution as determined under section 752 of the Code.

                  "Net Income" means, for any taxable period, the excess, if
         any, of the Company's items of income and gain for such taxable period
         over the Company's items of loss and deduction for such taxable period.
         The items included in the calculation of Net Income shall be determined
         in accordance with Section 4.5(b) and shall not include any items
         specifically allocated under Sections 5.1(c) through 5.1(j). For
         purposes of Sections 5.1(a) and (b), in determining whether Net Income
         has been allocated to any Member for any previous taxable period, any
         Unrealized Gain or Unrealized Loss allocated pursuant


                                       11
<PAGE>   17

         to Section 4.5(d)(i), (d)(ii) and (d)(iii) shall be treated as an item
         of gain or loss in computing Net Income.

                  "Net Loss" means, for any taxable period, the excess, if any,
         of the Company's items of loss and deduction for such taxable period
         over the Company's items of income and gain for such taxable period.
         The items included in the calculation of Net Loss shall be determined
         in accordance with Section 4.5(b) and shall not include any items
         specifically allocated under Sections 5.1(c) through 5.1(j). For
         purposes of Sections 5.1(a) and (b), in determining whether Net Loss
         has been allocated to any Member for any previous taxable period, any
         Unrealized Gain or Unrealized Loss allocated pursuant to Section
         4.5(d)(i), (d)(ii) and (d)(iii) shall be treated as an item of gain or
         loss in computing Net Loss.

                  "New Business" means, without duplication, (a) all revenues,
         expenses, repair costs and net cash flows resulting from gas volumes
         produced from the Dedicated Leases that flow on the Manta Ray Phase I
         Facilities pursuant to the Dedication Agreements, (b) all revenues,
         expenses, repair costs and net cash flows resulting from gas volumes
         flowing into the Manta Ray Phase II Facilities and then into the Manta
         Ray Phase I Facilities, (c) all revenues, expenses, repair costs and
         net cash flows resulting from gas volumes flowing solely on the Manta
         Ray Phase II Facilities and/or the Nautilus System, but not flowing on
         the Manta Ray Phase I Facilities, and (d) all revenues, expenses,
         repair costs and net cash flows relating to gas processing contracts or
         any operations other than gathering or transporting natural gas.

                  "Non-Cash Consideration" has the meaning given that term in
         Section 3.6(e) herein.

                  "Nonrecourse Built-in Gain" means with respect to any
         Contributed Properties or Adjusted Properties that are subject to a
         mortgage or negative pledge securing a Nonrecourse Liability, the
         amount of any taxable gain that would be allocated to the Members
         pursuant to Section 5.2(b)(i)(A), 5.2(b)(ii)(A) or 5.2(b)(iii) if such
         properties were disposed of in a taxable transaction in full
         satisfaction of such liabilities and for no other consideration.

                  "Nonrecourse Debt" has the meaning set forth in Treasury
         Regulation section 1.704-2(b)(4).

                  "Nonrecourse Deductions" means any and all items of loss,
         deduction, or expenditure (described in section 705(a)(2)(B) of the
         Code) that, in accordance with the principles of Treasury Regulation
         section 1.704-2(b)(1), are attributable to a Nonrecourse Liability.

                  "Nonrecourse Liability" has the meaning assigned to such term
         in Treasury Regulation section 1.704-2(b)(3).


                                       12
<PAGE>   18

                  "Non-Transferring Members" has the meaning given that term in
         Section 3.6(e) herein.

                  "Obligation" has the meaning given that term in Section
         4.3(a)(ii)(2).

                  "Offer Notice" has the meaning given that term in Section
         3.6(e).

                  "Operating Agreements" means collectively the Operating
         Agreement between Shell Holding and Manta Ray, the Operating Agreement
         between Manta Ray Gathering Company, L.L.C. and Manta Ray, the
         Operating Agreement between Marathon Holding and Manta Ray, the
         Operating Agreement between Marathon Holding and Nautilus, the
         Operating Agreement between Nautilus and Shell Holding, the Operating
         Agreement between the Company and Shell Holding.

                  "Option Period" has the meaning given that term in Section
         3.6(e) herein.

                  "Payout Amount" means an amount of money equal to 150% of the
         amount of the actual out-of-pocket capital cost of the relevant Major
         Expansion Project; provided, however that to the extent the Company,
         Neptune, Nautilus or Manta Ray, as applicable, elects to prepay all or
         any portion of the unamortized portion of the principal amount of the
         Payout Balance in accordance with Section 15.2, such Payout Amount
         shall be reduced as described in Section 15.2(c).

                  "Person" means any individual or entity, including, without
         limitation, any corporation, limited liability company, partnership
         (general or limited), joint venture, association, joint stock company,
         trust, unincorporated organization or government (including any board,
         agency, political subdivision or other body thereof).

                  "Proceeding" has the meaning given that term in Section 8.1.

                  "PUHCA" means the Public Utility Holding Company Act of 1935,
         as amended, and the rules and regulations promulgated thereunder.

                  "Recapture Income" means any gain recognized by the Company
         (computed without regard to any adjustment required by section 734 or
         743 of the Code) upon the disposition of any property or asset of the
         Company, which gain is characterized as ordinary income because it
         represents the recapture of deductions previously taken with respect to
         such property or asset.

                  "Reconciliation Adjustment" means, with respect to each
         relevant Capital Contribution, an additional amount to be credited to
         the contributing Member's Capital Account as of the Reconciliation Date
         in an amount equal to a carrying charge on such Capital Contribution
         calculated from the first day of the calendar month in which the
         Company actually spends the contributed capital to the Reconciliation
         Date at a rate per annum, compounded monthly, equal to 8.28%.


                                       13
<PAGE>   19

                  "Reconciliation Date" means the first day of the calendar
         month immediately following the calendar month in which any of the
         following events first occurs: (i) production from the Troika Field
         (Green Canyon Blocks 244 et al.) first flows on the Manta Ray System
         and the Nautilus System, (ii) the Nautilus System and Manta Ray System
         are each transporting from the Dedicated Leases an average of at least
         140,000,000 cubic feet of natural gas per day pursuant to the
         Dedication Agreements during any consecutive 60 day period or (iii)
         December 1, 1999.

                  "Record Date" means the date established by the Company for
         determining (a) the identity of Members (or Transferees, if applicable)
         entitled to notice of, or to vote at, any meeting of Members or
         entitled to vote by ballot or give approval of Company action in
         writing without a meeting or entitled to exercise rights in respect of
         any lawful action of Members or (b) the identity of Record Holders
         entitled to receive any report or distribution.

                  "Record Holder" means the Person in whose name a Membership
         Interest is registered on the books of the Company as of the opening of
         business on a particular Business Day.

                  "Rejected Lateral Opportunity" has the meaning given that term
         in Section 15.1.

                  "Relevant Area" means the Eugene Island, Rabbit Island, Ship
         Shoal, South Timbalier, Grand Isle, Ewing Bank, Green Canyon areas of
         the Gulf of Mexico, offshore state waters adjacent to St. Mary Parish,
         Louisiana and onshore St. Mary Parish, Louisiana from the coast to
         Garden City and such other offshore areas of the Gulf of Mexico or
         onshore areas into which the Nautilus System or Manta Ray System
         expands.

                  "Required Interest" means, subject to and in accordance with
         Section 7.5, the applicable percentage of Membership Interests of all
         Members required to authorize or approve a relevant act of the Company,
         including, without limitation, a Majority Interest, a Super-Majority
         Interest or all Membership Interests, as applicable.

                  "Residual Gain" or "Residual Loss" means any item of gain or
         loss, as the case may be, of the Company recognized for federal income
         tax purposes resulting from a sale, exchange or other disposition of a
         Contributed Property or Adjusted Property, to the extent such item of
         gain or loss is not allocated pursuant to Section 5.2(b)(i)(A) or
         5.2(b)(ii)(A), to eliminate Book Tax Disparities.

                  "Security Interest" means any security interest, lien,
         mortgage, encumbrance, hypothecation, pledge, or other obligation,
         whether created by operation of law or otherwise, created by any Person
         in any of its property or rights as part of a bona fide arms-length
         securitization transaction.

                  "Service" means the Internal Revenue Service.

                  "Shell Gas Pipeline Companies" means (i) Shell Gas Pipeline
         Company, (ii) Shell Holding and (iii) any direct or indirect Subsidiary
         of either (i) or (ii).


                                       14
<PAGE>   20

                  "Shell Holding" means Shell Seahorse Company.

                  "Shell Major Repairs" means all repairs resulting from Losses
         to the Boxer Line prior to the Reconciliation Date, except to the
         extent such Losses result from or constitute a Boxer Line Special
         Condition.

                  "Shell Reconciliation Date Income" has the meaning given that
         term in Section 4.5(c)(iii).

                  "Subject Interest" has the meaning given that term in Section
         3.6(e).

                  "Subsidiary" means, with respect to any relevant Person, any
         other Person that is controlled (directly or indirectly) and more than
         50%-owned (directly or indirectly) by the relevant Person. For purposes
         of this definition, the term control means the ability to direct the
         management or policies of such Person by ownership of voting interest,
         contract or otherwise.

                  "Substituted Member" means a Person who is admitted as a
         Member of the Company at such time as such Person has complied with the
         requirements of Section 3.5, in place of and with all the rights of a
         Transferor and who is shown as a Member on the books and records of the
         Company.

                  "Super-Majority Interest" means , subject to and in accordance
         with Section 7.5, any Member (together with its Affiliated Members) and
         at least one other non-Affiliated Member having among them more than
         74% of the Membership Interests of all Members.

                  "Tax Matters Member" has the meaning given that term in
         Section 9.3.

                  "Termination Right" has the meaning given that term in Section
         3.17.

                  "Termination Time" has the meaning given that term in Section
         3.17.

                  "Transfer" or "Transferred" means, other than granting a
         Security Interest, (i) a voluntary or involuntary sale, assignment,
         transfer, conveyance, exchange, bequest, devise, gift or any other
         alienation (in each case, with or without consideration) of any rights,
         interests or obligations with respect to all or any portion of any
         Membership Interest including, without limitation, a Foreclosure
         Transfer, or (ii) (A) the sale of all or substantially all of a
         Member's assets to a Person that is not an Affiliate of such Member
         prior to such sale, (B) a merger or consolidation involving a Member
         and a Person that is not an Affiliate of such Member prior to such
         merger or consolidation, or (C) a transfer, directly or indirectly, in
         one or more transactions, of a majority of the equity interests in a
         Member to a Person that is not an Affiliate of such Member prior to
         such transfer; provided, however, that a transfer, directly or
         indirectly, of the equity ownership (including, without limitation, a
         merger, consolidation, share exchange or similar transaction) or of all
         or substantially all of the assets of the direct or indirect parent of
         any Member shall not be considered a Transfer hereunder.


                                       15
<PAGE>   21

                  "Transferee" means a Person who receives all or part of a
         Member's Membership Interest through a Transfer but who has not become
         a Substituted Member.

                  "Transferor" means a Member, Substituted Member or a
         predecessor Transferor who Transfers a Membership Interest.

                  "Transferring Member" has the meaning given that term in
         Section 3.6(e) herein.

                  "Treasury Regulation" shall have the meaning set forth in
         Section 3.9.

                  "Unrealized Gain" attributable to any item of Company property
         means, as of any date of determination, the excess, if any, of (a) the
         fair market value of such property as of such date over (b) the
         Carrying Value of such property as of such date (prior to any
         adjustment to be made pursuant to Section 4.5(d) as of such date). In
         determining such Unrealized Gain, the aggregate cash amount and fair
         market value of a Company asset (including cash or cash equivalents)
         shall be determined by the Company using such reasonable method of
         valuation as it may adopt.

                  "Unrealized Loss" attributable to any item of Company property
         means, as of any date of determination, the excess, if any, of (a) the
         Carrying Value of such property as of such date (prior to any
         adjustment to be made pursuant to Section 4.5(d) as of such date) over
         (b) the fair market value of such property as of such date. In
         determining such Unrealized Loss, the aggregate cash amount and fair
         market value of a Company asset (including cash or cash equivalents)
         shall be determined by the Company using such reasonable method of
         valuation as it may adopt.

                  "Voting Stock" means capital stock issued by a corporation, or
         equivalent interests in any other Person, the holders of which are
         ordinarily, in the absence of contingencies, entitled to vote for the
         election of directors (or Persons with management authority performing
         similar functions) of such Person.

                  "Withdrawing Member" shall have the meaning given that term in
         Section 12.2(d).

         1.2 OTHER TERMS. Other terms may be defined elsewhere in the text of
this Agreement and shall have the meaning so given. Whenever the context
requires, the singular shall include the plural, and the plural, shall include
the singular.

         1.3 CONSTRUCTION. Whenever the context requires, the gender of all
words used in this Agreement includes the masculine, feminine, and neuter. All
references to Articles and Sections refer to articles and sections of this
Agreement, and all references to Exhibits are to exhibits attached hereto, each
of which is incorporated herein for all purposes. Articles and other titles or
headings are for convenience only and neither limit nor amplify the provisions
of the Agreement itself, and all references herein to articles, sections or
subdivisions thereof shall refer to the corresponding article, section or
subdivision thereof of this Agreement unless specific reference is made to such
articles, sections or subdivisions of another document or instrument.


                                       16
<PAGE>   22


                                   ARTICLE II.
                                  ORGANIZATION

         2.1 FORMATION. The Company has been organized as a Delaware limited
liability Company by the filing of a Certificate of Formation (the
"Certificate") with the Secretary of State of the State of Delaware pursuant to
the Act.

         2.2 NAME. The name of the Company is Ocean Breeze Pipeline Company,
L.L.C. and all Company business must be conducted in that name or such other
names that comply with applicable law as the Company may select from time to
time.

         2.3 PRINCIPAL OFFICE IN THE UNITED STATES; OTHER OFFICES. The principal
office of the Company in the United States shall be at 200 N. Dairy Ashford,
Houston, Texas 77079, or at such other place as the Company may designate from
time to time, which need not be in the State of Delaware. The Company may have
such other offices as the Members may designate from time to time.

         2.4 PURPOSE. The sole purpose of the Company is to own interests in
Manta Ray and Nautilus, which shall acquire, construct, own and operate the
Manta Ray System and the Nautilus System, respectively. Except for activities
related to such purposes, there are no other authorized business purposes of the
Company. The Company shall not engage in any activity or conduct inconsistent
with such purposes, including, without limitation, entering into any hedging,
futures, derivatives or similar transaction.

         2.5 FOREIGN QUALIFICATION. Prior to the Company's conducting business
in any jurisdiction other than Delaware, the Company shall comply, to the extent
procedures are available and those matters are reasonably within the control of
the Company, with all requirements necessary to qualify the Company as a foreign
limited liability company, and, if necessary, keep the Company in good standing,
in that jurisdiction.

         2.6 TERM. Subject to earlier termination pursuant to other provisions
of this Agreement (including those contained in Article XII), the term of the
Company shall be from the date of this Agreement through and including December
31, 2046.

         2.7 MERGERS AND EXCHANGES. Except as otherwise provided in this
Agreement or by applicable Laws, the Company may be a party to any (i) merger,
(ii) consolidation, (iii) exchange or acquisition or (iv) any other type of
reorganization.

         2.8 BUSINESS OPPORTUNITIES--NO IMPLIED DUTY OR OBLIGATION. Except to
the extent expressly provided in this Section 2.8 or Article XV, the Members and
their respective Affiliates may engage, directly or indirectly, without the
consent of the other Members or the Company, in other business opportunities,
transactions, ventures or other arrangements of any nature or description,
independently or with others, including without limitation, business of a nature
which may be competitive with or the same as or similar to the business of the
Company, regardless of the geographic location of such business, and without any
duty or obligation to account to the other Members or the Company in connection
therewith; provided,


                                       17
<PAGE>   23

however, that each Member (or any Affiliate thereof) shall jointly solicit on
behalf of, and offer to, Manta Ray any opportunity to acquire or otherwise
obtain the gas processing rights of Persons who are not Members (or Affiliates
of Members) with respect to the gas shipped by such Person on the Nautilus
System for delivery to the Garden City Gas Plant for processing, if capacity
exists or can be obtained under the Processing Agreement, before such Member (or
applicable Affiliate) shall be entitled to acquire or otherwise obtain such gas
processing rights and no Member (or any Affiliate thereof) shall compete with
Manta Ray or otherwise participate in processing arrangements with respect to
such gas; provided, however, that if any Member or any Affiliate thereof has
purchased the Garden City Gas Plant and subsequently expands such plant's
capacity in excess of that contemplated by the Processing Agreement, any
obligation of such Member (including its Affiliates) created by this Section 2.8
shall be waived and extinguished to the extent such obligation relates to
capacity created by such expansion; and provided, further, that if any Members
or any Affiliates thereof have acquired interests which sum to less that 100% of
the interests in the Garden City Gas Plant, any obligation of such Members
(including its Affiliates) created by this Section 2.8 shall be waived and
extinguished to the extent inconsistent with the duties and obligations of such
Members (including its Affiliates) to the other interest owners in the Garden
City Gas Plant. Nothing herein is intended to create a partnership, joint
venture, agency or other relationship creating fiduciary or quasi-fiduciary
duties or similar duties and obligations or subject the Members to joint and
several or vicarious liability or to impose any duty, obligation or liability
that would arise therefrom with respect to any or all of the Members or the
Company.


                                  ARTICLE III.
                       MEMBERSHIP INTERESTS AND TRANSFERS

         3.1 INITIAL MEMBERS. The initial Members of the Company are the Persons
executing this Agreement as of the date hereof in such capacity, each of which
is admitted to the Company as a Member effective contemporaneously with the
execution by such Person of this Agreement.

         3.2 NUMBER OF MEMBERS. The number of Members of the Company shall never
be fewer than two.

         3.3 MEMBERSHIP INTERESTS. The Members agree that each Member's
ownership in the Company shall be that which is set forth in Exhibit A, as
amended from time to time in accordance with the terms of this Agreement.

         3.4 REPRESENTATIONS AND WARRANTIES. Each Member hereby represents and
warrants to the Company and each other Member that (a) it is duly formed,
validly existing and (if applicable) in good standing under the Laws of the
state of its formation, and if required by Laws is duly qualified to do business
and (if applicable) is in good standing in the jurisdiction of its principal
place of business (if not formed therein); (b) that Member has full corporate,
limited liability company, partnership, trust, or other applicable power and
authority to execute and agree to this Agreement and to perform its obligations
hereunder and all necessary actions by the board of directors, shareholders,
managers, members, partners, trustees, beneficiaries, or other Persons


                                       18
<PAGE>   24

necessary for the due authorization, execution, delivery, and performance of
this Agreement by that Member have been duly taken; (c) that Member has duly
executed and delivered this Agreement and it is enforceable against such Member
in accordance with its terms, subject to bankruptcy, moratorium, insolvency and
other Laws generally affecting creditors' rights and general principles of
equity (whether applied in a proceeding in a court of law or equity); (d) that
Member's authorization, execution, delivery, and performance of this Agreement
does not conflict with any material obligation under any other material
agreement or arrangement to which that Member is a party or by which it is
bound; (e) that Member is an Eligible Citizen and will remain an Eligible
Citizen for so long as such Member remains a Member of the Company; (f) neither
that Member nor any of its Affiliates or Subsidiaries nor any Person in which it
owns an equity interest is a "holding company," a "subsidiary company" of a
"holding company" or of a "subsidiary company" of a "holding company," or a
"public utility" as each of such terms is defined in PUHCA (unless such Member,
Affiliate, Subsidiary, or Person has received an exemption from registering
under the PUHCA), and the ownership of a Membership Interest by such Member does
not, and, for so long as such Member owns a Membership Interest, will not, cause
the Company, its Subsidiaries or the other Members to be subject to or adversely
affected by PUHCA (including any approval requirements arising under Section
9(a)(2) of PUHCA); and (g) it (i) has been furnished with or given adequate
access to such information about the Company and the Membership Interest as the
Member has requested, (ii) has made its own independent inquiry and
investigation into, and based thereon has formed an independent judgment
concerning, the Company and that Member's Membership Interest therein, (iii) has
adequate means of providing for its current needs and possible individual
contingencies and is able to bear the economic risks of this investment and has
a sufficient net worth to sustain a loss of its entire investment in the Company
in the event such loss should occur, (iv) has such knowledge and experience in
financial and business matters as to be capable of evaluating the merits and
risks of an investment in the Company, (v) is an "accredited investor" within
the meaning of "accredited investor" under Regulation D of the Securities Act of
1933, as amended, and (vi) understands and agrees that its Membership Interest
shall not be sold, pledged, hypothecated or otherwise transferred except in
accordance with the terms of this Agreement and pursuant to an applicable
exemption from registration under the Securities Act of 1933 and other
applicable securities Laws. Upon the occurrence and during the continuation of
any event or condition which would cause a Member to be in breach of a
representation or warranty contained in Section 3.4(e) or (f), the breaching
Person shall be treated as a Transferee who has not become a Substituted Member
in accordance with the terms of Section 3.5(c).

         3.5 RESTRICTIONS ON THE TRANSFER OF A MEMBERSHIP INTEREST. A Member may
Transfer all or part of a Membership Interest only in accordance with applicable
Laws and the provisions of this Agreement, including the following provisions of
this Section. Any purported Transfer in breach of the terms of this Agreement
shall be null and void ab initio, and the Company shall not recognize any such
prohibited Transfer.

         (a) A Membership Interest shall not be Transferred except pursuant to
an applicable exemption from registration under the Securities Act of 1933 and
other applicable securities Laws;

                                       19
<PAGE>   25

         (b) Except as otherwise provided in this Agreement or by applicable
Laws, a Transfer of a Membership Interest shall be effective only to give the
Transferee the right to receive the share of allocations and distributions to
which the Transferor would otherwise be entitled, and no Transferee of a
Membership Interest shall have the right to become a Substituted Member;

         (c) Unless and until a Transferee is admitted as a Substituted Member,
(i) the Transferee shall have no right to exercise any of the powers, rights and
privileges of a Member hereunder other than to receive its share of allocations
and distributions pursuant to Section 3.5(b), and (ii) the Member who has
Transferred all or any part of its Membership Interest to such Transferee shall
cease to be a Member with respect to such Membership Interest upon Transfer of
such Membership Interest and thereafter shall have no further powers, rights and
privileges as a Member hereunder with respect to such Membership Interest (to
the extent so Transferred), but shall, unless otherwise relieved of such
obligations, remain liable for all obligations and duties as a Member with
respect to such Membership Interest; provided, however, that if the Transferee
reconveys such Membership Interest to the Transferor within ten days after the
Transferor becomes aware that the Transferee will not become a Substituted
Member, the Transferor shall once again be entitled to all of the powers, rights
and privileges of a Member hereunder;

         (d) Subject to compliance with the terms and conditions of Section 3.6,
a Transferee may become a Substituted Member if the Transferee agrees in writing
to be bound by all the terms and conditions, as then in effect, of this
Agreement;

         (e) At the time all of the provisions of Sections 3.5, 3.6 and 3.7 are
complied with, (i) a Substituted Member shall have all of the powers, rights,
privileges, duties, obligations and liabilities of a Member, as provided in this
Agreement and by applicable Laws to the extent of the Membership Interest so
Transferred and (ii) the Member who Transferred the Membership Interest shall be
relieved of all of the obligations and liabilities with respect to such
Membership Interest; provided that such Member shall remain fully liable for all
liabilities and obligations relating to such Membership Interest that accrued
prior to such Transfer;

         (f) The Company may, in its reasonable discretion, charge a Member a
reasonable fee to cover administrative expenses necessary to effect the Transfer
of all or part of such Member's Membership Interest;

         (g) In the absence of the substitution (as provided herein) of a
Transferee for a Transferor, any payment by the Company to the Transferor shall
acquit the Company and the Members of all liability to any other Persons who may
be interested in such payment by reason of a Transfer by such Member;

         (h) Notwithstanding any term or condition contained in Sections 3.5,
3.6 and 3.7, any Person shall have the right to grant a Security Interest in any
rights or obligations such Person may have arising from or related to this
Agreement, the Company or any interest therein and make a Transfer in connection
with any such Security Interest; provided that such Security Interest is not
created in violation of Sections 3.5(a) and (i) of this Agreement and any other


                                       20
<PAGE>   26

provisions contained in this Agreement and the Company is promptly notified in
writing of such Security Interest; and

         (i) Each Member or Transferee agrees not to Transfer all or any part of
its Membership Interest (or take or omit any action, filing, election, or other
action which could result in a deemed Transfer) if such Transfer (either
considered alone or in the aggregate with prior Transfers by the same Member or
any other Members or Transferees) would result in the termination of the Company
for federal income tax purposes. Such an attempted Transfer is void ab initio.

         (j) Notwithstanding any contrary provision contained in this Agreement,
no Person shall Transfer to any other Person such Person's rights or obligations
arising from or related to this Agreement, the Company or any interest therein
if such Transfer would result in violation of the Act or any other Laws. Any
such attempted Transfers are void ab initio.

         3.6 TRANSFER RESTRICTIONS.

         (a) Neither the Company nor any of the Members shall be bound or
otherwise affected by any Transfer of Membership Interest of which such Person
has not received notice pursuant to Section 3.7.

         (b) Any Member's Membership Interest may be Transferred to an Affiliate
of such Member; provided, that, if the Transferor's Membership Interest is
subject to a guaranty, the guaranty shall apply to the Transferee and its
Membership Interest. Notwithstanding the foregoing, any such Transfer shall be
void and have no effect unless such Transfer is made simultaneously with an
equal and proportionate transfer of membership interest in Neptune Pipeline
Company, L.L.C.

         (c) Subject to the right of first refusal set forth in Section 3.6(e),
a Member may Transfer all or any portion of its Membership Interest to any
Person that has a net worth calculated in accordance with GAAP of not less than
$150,000,000 immediately prior to the Transfer; provided that such net worth
requirement shall not apply in the case of a Foreclosure Transfer.
Notwithstanding the foregoing, any such Transfer shall be void and have no
effect unless such Transfer is made simultaneously with an equal and
proportionate transfer of membership interest in Neptune.

         (d) Except with respect to a Foreclosure Transfer, a Member in Default
shall not Transfer its Membership Interest.

         (e) Except with respect to Transfers according to the terms of Section
3.6(b), any Member who desires to Transfer all or any portion of its Membership
Interest ("Transferring Member") to a ready, willing and able Transferee shall
first offer to transfer such Membership Interest and the related membership
interest in Neptune (collectively, the "Subject Interest") to the other Members
(the "Non-Transferring-Members") as a group. Such offer shall be made by an
irrevocable written offer (the "Offer Notice") to transfer all of the Subject
Interest which the Transferring Member desires to Transfer and shall contain a
complete description of the


                                       21
<PAGE>   27

transaction in which the Transferring Member proposes to Transfer the Subject
Interest, including, without limitation, the name of the ready, willing and able
Transferee and the consideration specified. The Non-Transferring Members shall
have 45 days (the "Option Period") after actual receipt of the Offer Notice
within which to advise the Transferring Member whether or not they will acquire
all of such Subject Interest upon the terms and conditions contained in the
Offer Notice. If, within the Option Period, one or more Non-Transferring Members
elect to acquire such Subject Interest, then such Non-Transferring Member or
Members shall close such transaction in accordance with Section 3.6(f) no later
than the later to occur of (i) the closing date set forth in the Notice Offer or
(ii) 60 days after the last day of the Option Period.

                  If any Non-Transferring Member does not elect to acquire its
proportionate share of the Subject Interest being transferred, the remaining
Non-Transferring Members shall have the right to acquire an equal and undivided
portion of the remaining Subject Interest based on the relation of their
Membership Interest to the Membership Interest of all Non-Transferring Members
desiring to acquire a portion of such Membership Interest. The right herein
created in favor of the Non-Transferring Members as a group is an option to
acquire all, or none, of the Subject Interest offered for sale by the
Transferring Member. If the Non-Transferring Members as a group decline to
acquire all of the Subject Interest of the Transferring Member in accordance
with this Section 3.6(e), the Transferring Member may Transfer such Subject
Interest to the Transferee named in the Offer Notice delivered to the
Non-Transferring Members upon the terms described in such Offer Notice. If such
Transfer does not occur in accordance with the terms of such Offer Notice, the
Transferring Member shall again be subject to the provisions of this Section
3.6(e).

                  Upon consummation of any such Transfer (whether to a Member or
any other Person), such Transferee and its Membership Interest shall
automatically become a party to and be bound by this Agreement and shall
thereafter have all of the rights and obligations of a Member hereunder.
Notwithstanding the foregoing, all Transfers pursuant to this Section 3.6(e)
must also comply with and be governed by this Agreement, including any
restrictions on Transfers therein and on any Transferee becoming a Substituted
Member.

                  If any portion of the consideration set forth in the Offer
Notice is to be paid in a form other than cash or cash equivalents (including
real or personal property, promissory notes, securities, contractual benefits,
assumption of liabilities or anything else of value) ("Non-Cash Consideration"),
the Transferring Member shall state in its Offer Notice its determination of the
aggregate fair market value of such Non-Cash Consideration (which, in the case
of marketable securities, shall be the market price of such securities). If a
majority in interest of the Non-Transferring Members (calculated without
reference to the Membership Interest of the Transferring Member) disagree with
such determination, they shall notify the Transferring Member of such
disagreement within 5 Business Days of receiving the Offer Notice. If such
dispute is not resolved within 5 Business Days after such notice, any Member may
submit such dispute to binding arbitration by delivering an arbitration notice
to the other Members and the Company. The Member initiating arbitration shall
also simultaneously file duplicate copies of its notice of arbitration with the
regional office of the CPR Institute for Dispute Resolution (the "CPR
Institute") covering Houston, Texas, together with the appropriate fee as
provided in the


                                       22
<PAGE>   28

CPR Institute's administrative fee schedule. The notice of arbitration shall
contain a brief description of the nature of the dispute to be arbitrated. With
respect to any such arbitration, the Members hereby agree that: (i) the single
arbitrator shall be an appraiser or investment banking firm having expertise in
the valuation of the types of assets represented by the Non-Cash Consideration;
(ii) the arbitration proceedings shall be held in Houston, Texas at such
location selected by the arbitrator; (iii) all arbitration proceedings under
this Section shall be conducted in accordance with the Commercial Arbitration
Rules of the CPR Institute, as then amended and in effect; and such rules shall
be interpreted and applied and questions regarding the arbitration process not
resolved under such rules shall be determined in accordance with the Uniform
Arbitration Act, as enacted in the State of Delaware; provided, however, that
the arbitrator shall resolve such dispute with respect to the application and/or
interpretation of such rule or rules within ten days from the day a Member
submitted its notice of arbitration to the other Members, the Company and the
CPR Institute; (iv) within 5 Business Days following the receipt of the initial
arbitration notice by the Company, the Transferring Member and a designee of the
majority in interest of the Non-Transferring Members shall each submit to each
of the other Members, the Company and the CPR Institute a response in which it
proposes a single determination of the fair market value; and (v) the arbitrator
shall be required to select either the determination of the Transferring Member
or the determination of the designee of such majority in interest. The
consideration shall then be an amount of money, payable in cash, equal to the
total consideration stated in the Offer Notice, including the Fair Market Value
of any Non-Cash Consideration as determined in accordance with this Section.

         (f) At the closing of the Transfer of a Membership Interest pursuant to
this Agreement, the Transferee shall deliver to the Transferor the full
consideration agreed upon. Any membership interest transfer or similar taxes
involved in such sale shall be paid by the Transferor, and the Transferor shall
provide the Transferee with such evidence of the Transferor's authority to
Transfer hereunder and such tax lien waivers and similar instruments as the
Transferee may reasonably request.

         (g) If any governmental consent or approval is required with respect to
any Transfer, the Transferee shall have a reasonable amount of time (not to
exceed 60 days from the date upon which such Transfer would have been otherwise
consummated in accordance with the terms of this Agreement) to obtain such
consent or approval. All Members shall use reasonable, good faith efforts to
cooperate with the Transferee attempting to obtain, and to assist in timely
obtaining, such consent or approval; provided that no Member shall be required
to incur any out-of-pocket costs in connection with such cooperation and
assistance. After the expiration of such waiting period, such Transferee shall
forfeit its rights to acquire the Subject Interest with respect to such specific
transaction; provided, however, that such forfeiture shall not limit or
otherwise affect the forfeiting Transferee's rights with respect to any
subsequent proposed Transfer.

         (h) No Transfer of a Membership Interest shall effect a release of the
Transferor from any liabilities or obligations to the Company or the other
Members that accrued prior to the Transfer.


                                       23
<PAGE>   29

         3.7 DOCUMENTATION; VALIDITY OF TRANSFER. The Company may not recognize
for any purpose any purported Transfer of all or any part of a Membership
Interest unless and until the applicable provisions of Sections 3.5 and 3.6 have
been satisfied and the Company has received, on behalf of the Company, a
document in a form acceptable to the Company executed by both the Transferor (or
if the Transfer is on account of the death, incapacity, or liquidation of the
Member, its representative) and the Transferee. Such document shall (i) include
the notice address of any Person to be admitted to the Company as a Substituted
Member and such Person's agreement to be bound by this Agreement with respect to
the Membership Interest or part thereof being obtained, (ii) set forth the
Membership Interest after the Transfer of the Transferor and the Person to which
the Membership Interest or part thereof is Transferred (which together must
total the Membership Interest of the Transferor before the Transfer), (iii)
contain a representation and warranty that the Transfer was made in accordance
with all applicable Laws (including state and federal securities Laws) and the
terms and conditions of this Agreement, and (iv) if the Person to which the
Membership Interest or part thereof is Transferred is to be admitted to the
Company as a Substituted Member, its representation and warranty that the
representations and warranties in Section 3.4 are true and correct with respect
to such Person. Each Transfer and, if applicable, admission complying with the
provisions of this Section 3.7 and Sections 3.5 and 3.6 is effective against the
Company as of the first business day of the calendar month immediately
succeeding the month in which (y) the Company receives the document required by
this Section 3.7 reflecting such Transfer, and (z) the other requirements of
Sections 3.5 and 3.6 have been met.

         3.8 [RESERVED].

         3.9 POSSIBLE ADDITIONAL RESTRICTIONS ON TRANSFER. Notwithstanding
anything to the contrary contained in this Agreement, in the event of (i) the
enactment (or imminent enactment) of any legislation, (ii) the publication of
any temporary or final regulation by the Treasury Department ("Treasury
Regulation"), (iii) any ruling by the Service or (iv) any judicial decision that
in any such case, in the opinion of counsel to the Company, would result in the
taxation of the Company for federal income tax purposes as a corporation or
would otherwise subject the Company to being taxed as an entity for federal
income tax purposes, this Agreement shall be deemed to impose such restrictions
on the Transfer of a Membership Interest as may be required, in the opinion of
counsel to the Company, to prevent the Company from being taxed as a corporation
or otherwise being taxed as an entity for federal income tax purposes, and the
Members thereafter shall amend this Agreement as necessary or appropriate to
impose such restrictions.

         3.10 ADDITIONAL MEMBERSHIP INTERESTS. Additional Persons may be
admitted to the Company as Members, and Membership Interests may be created and
issued to those Persons and to existing Members upon a unanimous vote by the
Members and subject to the terms and conditions of this Agreement. Such
admission must comply with any additional terms and conditions the Members may
in their sole discretion determine at the time of admission. A document, in a
form acceptable to the Company, shall specify the terms of admission or issuance
and shall include, among other things, the Membership Interest applicable
thereto. Any such admission of a new Member also must comply with the provisions
of Section 3.5(d). The provisions of this Section 3.10 shall not apply to
Transfers of Membership Interests.


                                       24
<PAGE>   30

         3.11 CODE SECTION 708 TRANSFERS.

         (a) A Member that is not a natural person may not cause or permit an
interest, direct or indirect, in itself to be Transferred such that, after the
Transfer, the Company would be considered to have terminated within the meaning
of section 708 of the Code.

         (b) On any breach of the provisions of Section 3.11(a), the Company
shall have (i) the right to consent to such Transfer or (ii) the option to buy,
and, on exercise of that option, the breaching Member shall sell, the breaching
Member's Membership Interest, all in accordance with Section 11.1, as if the
breaching Member were a Bankrupt Member.

         3.12 INFORMATION.

         (a) In addition to the other rights specifically set forth in this
Agreement, each Member is entitled to all information to which that Member is
entitled to have access pursuant to the Act under the circumstances and subject
to the conditions therein stated.

         (b) The Members acknowledge that, from time to time, they may receive
information from or regarding the Company, its customers or any other Member or
its Affiliates in the nature of trade secrets or secret or proprietary
information or information that is otherwise confidential, the release of which
may be damaging to the Company or the Member or its Affiliates, as applicable,
or Persons with which they do business. Each Member shall hold in strict
confidence any such information it receives and may not disclose such
information to any Person other than another Member, except for disclosures (i)
to comply with any Laws, (ii) to Affiliates, advisers or representatives of the
Member or Persons to which that Member's Membership Interest may be Transferred
as permitted by this Agreement, but only if the recipients of such information
have agreed to be bound by the provisions of this Section 3.12(b), (iii) of
information that a Member also has received from a source independent of the
Company and that such Member reasonably believes such source obtained such
information without breach of any obligation of confidentiality, (iv) of
information obtained prior to the formation of the Company, provided that this
clause (iv) shall not relieve any Member or any of its Affiliates from any
obligations it may have to any other Member or any of its Affiliates under any
existing confidentiality agreement, (v) to lenders, accountants and other
representatives of the disclosing Member with a need to know such information,
provided that the disclosing Member shall be responsible for such
representatives' use and disclosure of any such information, or (vi) of public
information. The Members acknowledge that a breach of the provisions of this
Section 3.12(b) may cause irreparable injury to the Company or another Member
for which monetary damages are inadequate, difficult to compute, or both.
Accordingly, the Members agree that the provisions of this Section 3.12(b) may
be enforced by injunctive action or specific performance.

         (c) The Members acknowledge that, from time to time, the Company may
need information from any or all of such Members for various reasons, including,
without limitation, for complying with various federal and state regulations.
Each Member shall provide to the Company all information reasonably requested by
the Company within a reasonable amount of time from the date such Member
receives such request; provided, however, that no Member shall be obligated to
provide such information to the Company to the extent such disclosure (i)


                                       25
<PAGE>   31

could reasonably be expected to result in the breach or violation of any
contractual obligation (if a waiver of such restriction cannot reasonably be
obtained) or Law or (ii) involves secret, confidential or proprietary
information.

         3.13 LIABILITY TO THIRD PARTIES. Except as required by the Act, no
Member shall be liable to any Person (including any third party or to another
Member) (i) as the result of any act or omission of another Member or (ii) for
Company losses, liabilities or obligations (except as otherwise expressly agreed
to in writing by such Member).

         3.14 RESIGNATION. Except to the extent expressly permitted by Section
3.17, each Member hereby covenants and agrees that it will not resign from the
Company as a Member.

         3.15 LACK OF MEMBER AUTHORITY. No Member has the authority or power to
act for or on behalf of the Company, do any act that would be binding on the
Company, or incur any expenditures on behalf of the Company, unless expressly
authorized to do so in writing by the Company.

         3.16 [RESERVED.]

         3.17 FAILURE TO ACCEPT NAUTILUS CONSTRUCTION CERTIFICATE. Except for
Section 3.18, notwithstanding any provision of this Agreement to the contrary,
the Members hereby agree that, subject to the terms and conditions of this
Section, any Member shall have the right (the "Termination Right") to cause the
prompt dissolution and liquidation of the Company and its Subsidiaries if the
construction authorization requested by Nautilus in its Application for
Certificates of Public Convenience and Necessity and Request for Expedited
Action (FERC Docket No. CP96-790 et al.) (the "Construction Certificate") is not
acceptable to such Member for any reason. The Termination Right may be exercised
only by voting to reject the Construction Certificate at the meeting at which
such vote is considered, which meeting shall be held on the first Business Day
immediately following the 12th day after the date on which the Construction
Certificate is issued (the "Termination Time"). Each Member which either votes
to accept the Construction Certificate or abstains on such vote or fails to
attend such meeting shall be deemed to have voted in favor of acceptance of the
Construction Certificate and shall have waived its right to exercise the
Termination Right. At least five days prior to such meeting, the Members shall
convene to discuss issues and positions related to the Construction Certificate.
At such time as the Company has voted to accept the Construction Certificate,
the rights and obligations created by this Section shall automatically and
permanently terminate. If any Member exercises the Termination Right in
accordance with the terms and conditions of this Section, and subject to the
rights created by Section 3.17(d) to acquire Manta Ray and/or Nautilus after all
liabilities have been discharged or for which firm arrangements have been made
and all assets (other than rights of way and regulatory certificates or
approval(s)) have been distributed to the Members, the Company and its
Subsidiaries shall be dissolved and liquidated promptly using the general
procedures set forth in Article XII subject to the following:

                  (a) The intent of the dissolution and liquidation is, to the
         extent practicable, for each Member (including its affiliates) to be
         returned to substantially the same


                                       26
<PAGE>   32

         position which it held prior to the Formation Date, which intent
         includes (i) returning to each Member (including its affiliates) the
         assets and liabilities which it contributed, (ii) having Leviathan
         Holding own and control, and bear the risk and receive any gain or
         assume any loss associated with the Manta Ray Phase I Facilities
         (including the related compressor), (iii) having Shell Holding and
         Marathon Holding own and control the new pipe and related materials on
         terms and conditions substantially similar to those set forth in the
         August 15th, 1996 Letter Agreement between Marathon Oil Company and
         Shell Gas Pipeline Company, and bear the risk and receive any gain or
         assume any loss associated with the purchase and holding of new pipe
         and the related construction activities and (iv) having each Member
         share any other gains and losses from the sale of all remaining assets
         and all remaining liabilities of the Company and its Subsidiaries in
         proportion to its Membership Interest.

                  (b) All of the non-cash assets contributed to the Company or
         the applicable Subsidiary shall be reconveyed, free and clear of all
         liens and encumbrances (other than liens or encumbrances created prior
         to the conveyance of such assets to the Company or the applicable
         Subsidiary), to the Person which conveyed such non-cash assets to the
         Company or such Subsidiary in exchange for such assignee assuming any
         obligations related to such assets.

                  (c) [RESERVED]

                  (d) If any Member exercises the Termination Right, any one or
         more Members (including their Affiliates) which (i) voted in favor of
         accepting the Construction Certificate and (ii) desire to proceed with
         all or any portion of the Manta Ray System and/or the Nautilus System,
         shall have the right, until 1:00 p.m. (Central Time) on the
         twenty-fifth day following issuance of the Construction Certificate to
         be conveyed, as soon as reasonably practicable, all of the membership
         interest in Nautilus and/or Manta Ray, as applicable, in lieu of
         dissolving Nautilus and/or Manta Ray, as applicable, free and clear of
         all liens or encumbrances, immediately following the liquidation of all
         of the other assets and liabilities pursuant to Section 3.17(a) and
         3.17(b)(or after other firm provisions have been made with respect to
         such liabilities). The conveyance will be made without payment of
         additional consideration, except that the proceeding Members shall be
         obligated to repay to the other Members any amounts expended to acquire
         any right of way or regulatory permit or approval retained by Nautilus
         or Manta Ray, as applicable. Any such right of way or regulatory permit
         or approval retained by Nautilus or Manta Ray, as applicable, shall be
         owned by such Company free and clear of all liens and encumbrances
         (other than liens or encumbrances created prior to the conveyance of
         such assets to the Company or the applicable Subsidiary).

         3.18 OTHER CONTINGENCIES. Notwithstanding any rights set forth in
Section 3.17, the Members shall have the following rights and obligations
created by, and for the periods set forth in, this Section 3.18.


                                       27
<PAGE>   33

                  (a) If the declaratory order respecting the non-jurisdictional
         status of the Manta Ray Phase II Facilities or, in the alternative, a
         certificate of public convenience and necessity under the NGA
         authorizing the construction of the Manta Ray Phase II Facilities has
         been issued on or before April 1, 1997 then the Members agree to
         promptly proceed with the construction of the Manta Ray Phase II
         Facilities. If such facilities are constructed as facilities not
         subject to the NGA, they will be owned by Manta Ray; otherwise they
         will be owned by Nautilus or such entity as the Members unanimously
         agree upon.

                  (b) If either the declaratory order or the certificate of
         public convenience and necessity referred to in (a) above has been
         issued on or before April 1, 1997 but the Construction Certificate has
         not been issued on or before April 1, 1997, any Member which reasonably
         believes that the Construction Certificate will not be issued by June
         1, 1997 shall have the right, until April 10, 1997, to eliminate the
         obligations of the Members to proceed with the construction of the
         Nautilus Initial Facilities and to cause the Membership Interests to be
         adjusted in accordance with Section 3.18(e); however, no Membership
         Interest adjustment shall be made if two or more Members elect to
         promptly reconstitute Nautilus and proceed with the Nautilus Initial
         Facilities and such reconstituting Members have both (x) received a
         Construction Certificate and (y) begun Nautilus Initial Facilities
         construction, by December 31, 1998, otherwise by December 31, 1998 the
         Membership Interests shall be adjusted in accordance with Section
         3.18(e) and Leviathan Holding, if it is not one of the reconstituting
         Members, shall be reimbursed an amount equal to the value Leviathan
         Holding would have realized had the Reconciliation Adjustment under
         Section 3.18(e) been made on the Reconciliation Date plus a cost of
         capital adjustment equal to ten and one-half percent (10.5%). If the
         reconstituting Members construct the Nautilus Initial Facilities, such
         Members agree to use good faith reasonable efforts to maintain the
         transport rates on the Nautilus System agreed to in the Precedent
         Agreements between (i) Shell Offshore Inc., Shell Deepwater Development
         Inc., Shell Deepwater Production Inc., and Nautilus, and (ii) Marathon
         Oil Company and Nautilus subject to the other terms and provisions of
         such Precedent Agreement.

                  (c) If neither the declaratory order nor the certificate of
         public convenience and necessity referred to in (a) above has been
         issued on or before April 1, 1997 but the Construction Certificate has
         been issued on or before April 1, 1997, then the Members shall use
         commercially reasonable good faith efforts to construct alternative
         facilities in lieu of the Manta Ray Phase II Facilities, which
         facilities would be designed to achieve, as nearly as possible, the
         same practical benefits anticipated to be derived from the Manta Ray
         Phase II Facilities and the decision as to the alternative facilities
         shall be made by a Majority Interest.

                  (d) If neither the declaratory order nor the certificate of
         public convenience and necessity referred to in (a) above has been
         issued on or before April 1, 1997 and the Construction Certificate has
         not been issued on or before April 1, 1997, then each Member shall have
         the right to elect, until April 10, 1997, to cause the prompt


                                       28
<PAGE>   34

         dissolution and liquidation of the Company, Nautilus and Manta Ray on
         terms and conditions substantially similar to those set forth in
         Section 3.17.

                  (e) If any Member properly exercises its rights to adjust the
         Membership Interests pursuant to this Section 3.18(e), such adjustment
         shall be made in accordance with the following general procedures:

                           (i) If only the Manta Ray Phase II Facilities are
                  built and such facilities are constructed pursuant to a
                  Certificate of Public Convenience and Necessity under the NGA,
                  such facilities will be owned by Nautilus, and the Members
                  agree they will promptly vote to cause Nautilus or Manta Ray,
                  as applicable, to promptly reconvey any excess pipe and other
                  assets which were purchased for the Nautilus Initial
                  Facilities to Shell Holding and Marathon Holding free of any
                  liens or encumbrances (other than liens or encumbrances
                  created prior to the conveyance of such assets to the Company,
                  Neptune, or the applicable Subsidiary);

                           (ii) Subject to Section 3.18(e)(vii) if the Manta Ray
                  Phase II Facilities are not subject to regulation under the
                  NGA, such facilities will be owned by Manta Ray, and the
                  Members agree they will vote to cause Nautilus to be dissolved
                  and its assets to be liquidated pursuant to Section 3.17(a);

                           (iii) [RESERVED]

                           (iv) [RESERVED]

                           (v) Once the actions contemplated in Section
                  3.18(e)(i-iv) have been taken, all references in this
                  Agreement to the Manta Ray System and the Nautilus System
                  shall be amended accordingly;

                           (vi) On the Reconciliation Date, the Membership
                  Interests of the Members will be adjusted to equal the new
                  ownership interests of Shell Holding equal to 45%, Leviathan
                  Holding equal to 35%, and Marathon Holding equal to 20%. Upon
                  the adjustment of the Membership Interests in the manner set
                  forth in the preceding sentence, (i) the definition of
                  "Majority Interest" in Section 1.1 will be amended to replace
                  each reference to "50%" with a reference to "55%," (ii) the
                  definition of "Super-Majority Interest" in Section 1.1. shall
                  be deemed to be amended to replace each reference to "74%"
                  with a reference to "64%" and (iii) Exhibit A shall be deemed
                  to be amended to reflect the adjusted Membership Interests set
                  forth above; and

                           (vii) In lieu of the Members causing the dissolution
                  and liquidation of Nautilus in accordance with this Section
                  3.18 and subject to Section 3.17(a)(iii), the Members which
                  desire to continue to seek the Construction Certificate shall
                  have the right to be conveyed, as soon as reasonably
                  practicable, all of the membership interest in Nautilus free
                  and clear of all liens and encumbrances immediately following
                  the liquidation of all of the other assets and liabilities
                  pursuant to Section 3.18 (or after firm provisions have been
                  made with respect to such liabilities). The conveyance will be
                  made without


                                       29
<PAGE>   35

                  payment of additional consideration, except that the
                  proceeding Members shall be obligated to repay to the other
                  Members any amounts expended to acquire any right of way or
                  regulatory permit or approval retained by Nautilus. Any such
                  right of way or regulatory permit or approval retained by
                  Nautilus shall be owned free and clear of all liens or
                  encumbrances (other than liens and encumbrances created prior
                  to the conveyance of such assets to Neptune or Nautilus, as
                  applicable).


                                   ARTICLE IV.
                              CAPITAL CONTRIBUTIONS


         4.1 INITIAL CAPITAL CONTRIBUTIONS. The Members shall make the following
Capital Contributions as further described in Exhibit A (the "Initial Capital
Contributions"):

         (a) Contributions by each Member of amounts equal to 1% of such
Member's membership interest in Nautilus and Manta Ray as set forth on Exhibit
A.

         (b) [Reserved].

         (c) [Reserved].

         (d) [Reserved].

         (e) Reconciling contributions from or distributions to the applicable
Member or Members paid within 15 Business Days following the Reconciliation Date
to the extent necessary to adjust each Member's Capital Account balance as of
the Reconciliation Date, after all other Reconciliation Date adjustments have
been made, by an amount equal to the difference, if any, between (i) the product
of (a) the aggregate Capital Accounts on the Reconciliation Date multiplied by
(b) such Member's Membership Interest as set forth on Exhibit A, or if
applicable in Section 3.18(e) minus (ii) such Member's Capital Account balance.
Any such positive difference shall result in a contribution, and any such
negative difference shall result in a distribution, such that, after all such
contributions and distributions, the Capital Accounts in the aggregate, shall
remain unchanged; and

         (f) [Reserved].

         4.2 SUBSEQUENT CONTRIBUTIONS. Unless unanimously agreed to in writing
by the Members, no Member shall be required to make any Capital Contributions
other than the Initial Capital Contributions as contemplated by Section 4.1;
provided, that, notwithstanding any provisions in this Agreement to the
contrary, no Member shall be required to make any Capital Contribution, other
than an Initial Capital Contribution, if such Member did not vote to approve
such Capital Contribution.

         4.3 FAILURE TO CONTRIBUTE.

         (a) If a Member does not contribute by the time required all or any
portion of a Capital Contribution such Member ("Delinquent Member") is required
to make as provided in this Agreement, any one or more non-Delinquent Members
may advance the entire amount of the


                                       30
<PAGE>   36

Delinquent Member's Capital Contribution that is in Default, with each
non-Delinquent Member electing to participate making its share of such advance
in proportion to its Membership Interest or in such other percentages as the
participating Members may agree. Each non-Delinquent Member who makes such an
advance on behalf of a Delinquent Member shall have the right to designate the
extent to which such advance will (x) constitute a loan to the Delinquent Member
and/or (y) result in an immediate adjustment of the Membership Interests of the
Delinquent Member and the non-Delinquent Member making such election; provided,
however, that if the advancing non-Delinquent Member does not notify the Company
of its election to have all, or any portion of such advance treated as a loan to
the Delinquent Member, in writing, at the time the advance is made then such
advance shall automatically result in an immediate adjustment of the Membership
Interests:

                  (i) To the extent one or more non-Delinquent Members does not
         elect to have an advance pursuant to Section 4.3(a) treated as a loan
         to the Delinquent Member, or affirmatively elects to have such advance
         result in an adjustment of the Membership Interests, the Company shall
         automatically adjust the Membership Interest for each Member to equal
         the percentage obtained by dividing (A) the Capital Account of such
         Member (including any Capital Contribution made by such Member under
         this Section by (B) the aggregate Capital Accounts of all Members
         (including all Capital Contributions made under this Section). Upon the
         adjustment of the Membership Interests in the manner set forth in the
         preceding sentence, Exhibit A shall be deemed to be amended to reflect
         such adjusted Membership Interests. Notwithstanding the foregoing, the
         Delinquent Member shall have the right to re-acquire the interest in
         question from the advancing non-Delinquent Member within 30 days
         following the date on which such Membership Interest adjustment is made
         by paying the entire amount advanced by such non-Delinquent Member in
         return for such adjustment, plus 12 percent per annum.

                  (ii) To the extent one or more non-Delinquent Members (the
         "Lending Member," whether one or more) does elect to have an advance
         pursuant to Section 4.3(a) constitute a loan to the Delinquent Member,
         such advance shall have the following results:

                           (1) the sum advanced shall constitute a loan from the
                  Lending Member to the Delinquent Member and a Capital
                  Contribution of that sum to the Company by the Delinquent
                  Member pursuant to the applicable provisions of this
                  Agreement,

                           (2) the principal balance of the loan and all accrued
                  unpaid interest thereon (collectively, the "Obligation") shall
                  be due and payable in whole on the tenth Business Day after
                  the day written demand requesting payment of the Obligation is
                  made by the Lending Member to the Delinquent Member; provided,
                  however that the Delinquent Member may prepay the Obligation
                  in whole or in part at any time prior to the date due.

                           (3) the amount lent shall bear interest at the
                  Default Interest Rate from the date on which the advance is
                  deemed made until the date that the loan,


                                       31
<PAGE>   37

                  together with all interest accrued thereon and all costs and
                  expenses associated therewith ("Costs"), is repaid to the
                  Lending Member,

                           (4) all distributions from the Company that otherwise
                  would be made to the Delinquent Member (whether before or
                  after dissolution of the Company) instead shall be paid to the
                  Lending Member until the Obligation and any Costs have been
                  paid in full to the Lending Member (with payments being
                  applied first to accrued and unpaid interest, second to Costs,
                  and finally to principal),

                           (5) [Reserved.]

                           (6) the Lending Member shall have the right, in
                  addition to the other rights and remedies granted to it
                  pursuant to this Agreement or available to it at law or in
                  equity, to take any action (including, without limitation,
                  court proceedings and exercising the rights of a secured party
                  under the Uniform Commercial Code of the State of Texas) that
                  the Lending Member may deem appropriate to obtain payment from
                  the Delinquent Member of the Obligation and all Costs; and

                           (7) initially, a loan by any Member to another Member
                  as contemplated by this Section 4.3(a)(ii) shall not be
                  considered a Capital Contribution by the Lending Member and
                  shall not increase the Capital Account balance of the Lending
                  Member. Notwithstanding the foregoing, in the event the
                  principal and interest of any such loan have not been repaid
                  within one year from the date of the loan, the Lending Member,
                  at any time thereafter by giving written notice to the
                  Company, may elect to have the unpaid principal and interest
                  balance of such loan transferred to and increase such Lending
                  Member's Capital Account with a corresponding decrease in the
                  Capital Account of the Member on whose behalf such loan was
                  made. Upon such transfer, the loan shall be treated as a
                  Capital Contribution and the Membership Interest for each
                  Member shall be automatically adjusted to equal the percentage
                  obtained by dividing (A) the Capital Account of such Member
                  (including any Capital Contribution made on behalf of another
                  Member) by (B) the aggregate Capital Accounts of all Members
                  (including all Capital Contributions made on behalf of other
                  Members). Upon the adjustment of the Membership Interests in
                  the manner set forth in the preceding sentence, Exhibit A
                  shall be deemed to be amended to reflect such adjusted
                  Membership Interests.

         (b) If the non-Delinquent Members do not exercise the rights granted by
Section 4.3(a) within 14 days after the Delinquent Member fails to make its
Capital Contribution when due, then the Company, by a vote of a majority in
interest of the non-Delinquent Members, shall have the right to exercise the
following remedies:

                  (i) the Company may at any time take such action (including,
         without limitation, court proceedings) as the Company may deem
         appropriate to obtain payment by the Delinquent Member of the portion
         of the Delinquent Member's Capital


                                       32
<PAGE>   38

         Contribution that is in Default, along with all Costs and expenses
         associated with the collection of such Delinquent Member's Capital
         Contribution; and

                  (ii) the Company may at any time exercise any other rights and
         remedies available at law or in equity.

         4.4 RETURN OF CONTRIBUTIONS. A Member is not entitled (i) to the return
of any part of any Capital Contributions other than any preferential or
disproportionate distributions to the extent such distributions are expressly
required to be returned by this Agreement or (ii) to be paid interest in respect
of either its Capital Account or its Capital Contributions. An unrepaid Capital
Contribution is not a liability of the Company or of any Member. A Member is not
required to contribute or to lend any cash or property to the Company to enable
the Company to return any other Member's Capital Contributions.

         4.5 CAPITAL ACCOUNTS. A separate capital account ("Capital Account")
shall be established and maintained for each Member in accordance with the rules
of Treasury Regulation section 1.704-1(b)(2)(iv) and the following terms and
conditions:

         INCREASES AND DECREASES

         (a) Each Member's Capital Account shall be (i) increased by (A) the
amount of cash or cash equivalents contributed by that Member to the Company as
capital, (B) the Net Asset Value of property contributed by that Member to the
Company as capital, (C) the amount of any loans transferred by such Member to
its Capital Account pursuant to Section 4.3(a)(ii)(7) (contributions
contemplated by subparagraphs (A) and (B) shall be referred to as "Capital
Contributions"), and (D) allocations to that Member of Company income and gain
(or items thereof), including, without limitation, income and gain exempt from
tax and income and gain described in Treasury Regulation section
1.704-1(b)(2)(iv)(g), but excluding income and gain described in Treasury
Regulation section 1.704-1(b)(4)(i); and (ii) shall be decreased by (A) the
amount of cash or cash equivalents distributed to that Member by the Company,
(B) the Net Asset Value of property distributed to that Member by the Company,
and (C) allocations of Company losses and deductions (or items thereof),
including losses and deductions described in Treasury Regulation section
1.704-1(b)(2)(iv)(g) (but excluding losses or deductions described in Treasury
Regulation section 1.704-1(b)(4)(i) or (iii));


         METHOD FOR DETERMINING INCOME, GAIN OR LOSS AND DEDUCTIONS

         (b) For purposes of computing the amount of any item of income, gain,
loss or deduction to be reflected in the Members' Capital Accounts, the
determination, recognition and classification of any such item shall be the same
as its determination, recognition and classification for federal income tax
purposes (including, without limitation, any method of depreciation, cost
recovery or amortization used for that purpose), provided that:

                  (i) All fees and other expenses incurred by the Company to
         promote the sale of (or to sell) any interest that can neither be
         deducted nor amortized under section 709 of


                                       33
<PAGE>   39

         the Code, if any, shall, for purposes of Capital Account maintenance,
         be treated as an item of deduction at the time such fees and other
         expenses are incurred and shall be allocated among the Members pursuant
         to Sections 5.1 and 5.2;

                  (ii) Except as otherwise provided in Treasury Regulation
         section 1.704 1(b)(2)(iv)(m), the computation of all items of income,
         gain, loss and deduction shall be made without regard to any election
         under section 754 of the Code which may be made by the Company and, as
         to those items described in section 705(a)(1)(B) or 705(a)(2)(B) of the
         Code, without regard to the fact that such items are not includable in
         gross income or are neither currently deductible nor capitalized for
         federal income tax purposes;

                  (iii) Any income, gain or loss attributable to the taxable
         disposition of any Company property shall be determined as if the
         adjusted basis of such property as of such date of disposition were
         equal in amount to the Company's Carrying Value with respect to such
         property as of such date;

                  (iv) In accordance with the requirements of section 704(b) of
         the Code, any deductions for depreciation, cost recovery or
         amortization attributable to any Contributed Property shall be
         determined as if the adjusted basis of such property on the date it was
         acquired by the Company was equal to the Asset Value of such property
         on the date it was acquired by the Company. Upon an adjustment pursuant
         to Section 4.5(d) to the Carrying Value of any Company property subject
         to depreciation, cost recovery or amortization, any further deductions
         for such depreciation, cost recovery or amortization attributable to
         such property shall be determined (A) as if the adjusted basis of such
         property were equal to the Carrying Value of such property immediately
         following such adjustment and (B) using a rate of depreciation, cost
         recovery or amortization derived from the same method and useful life
         (or, if applicable, the remaining useful life) as is applied for
         federal income tax purposes; provided, however, that if the asset has a
         zero adjusted basis for federal income tax purposes, depreciation, cost
         recovery or amortization deductions shall be determined using any
         reasonable method that the Company may adopt; and

                  (v) any income of the Company that is exempt from federal
         income tax and not otherwise taken into account in computing Net Income
         or Net Loss shall be added to such taxable income or loss.


         IMPACT OF AND ADJUSTMENTS FOR SUCCESSION IN INTERESTS

         (c) A Transferee shall succeed to the Capital Account of the Transferor
relating to the Membership Interest so Transferred; provided, however, that if
the Transfer causes a termination of the Company under section 708(b)(1)(B) of
the Code, the Company's properties shall be deemed to have been distributed in
liquidation of the Company to the Members (including any Transferee of a
Membership Interest that is a party to the Transfer causing such termination)
pursuant to Section 12.2 and recontributed by such Members in reconstitution of
the Company. Any such deemed distribution shall be treated as an actual
distribution for purposes of this Section 4.5. In such event the Carrying Values
of the Company properties shall be adjusted


                                       34
<PAGE>   40

immediately prior to such deemed distribution pursuant to Section 4.5(d)(ii) and
such Carrying Values shall then constitute the fair market values of such
properties upon such deemed contribution to the reconstituted Company for the
purposes of determining the Asset Value and otherwise. The Capital Accounts of
such reconstituted Company shall be maintained in accordance with the principles
of this Section 4.5.

         ADDITIONAL MEMBERSHIP INTERESTS

         (d) (i) Consistent with the provisions of Treasury Regulation section
1.7041(b)(2)(iv)(f), on an issuance of additional Membership Interests for cash
or Contributed Property, the Capital Accounts of all Members and the Carrying
Value of each Company property immediately prior to such issuance shall be
adjusted upward or downward to reflect any Unrealized Gain or Unrealized Loss
attributable to such Company property, as if such Unrealized Gain or Unrealized
Loss had been recognized on an actual sale of each such property immediately
prior to such issuance and had been allocated to the Members at such time
pursuant to Section 5.1.

         ADJUSTMENTS PRIOR TO A DISTRIBUTION

         (ii) In accordance with Treasury Regulation section
1.704-1(b)(2)(iv)(f), immediately prior to any distribution to a Member of any
Company property (other than a distribution of cash or cash equivalents that are
not in redemption or retirement of a Membership Interest), the Capital Accounts
of all Members and the Carrying Value of each Company property shall be adjusted
upward or downward to reflect any Unrealized Gain or Unrealized Loss
attributable to such Company property, as if such Unrealized Gain or Unrealized
Loss had been recognized in a sale of such property immediately prior to such
distribution for an amount equal to its fair market value (which shall be
determined by the Company using any valuation method it deems reasonable under
the circumstances), and had been allocated to the Members at such time, pursuant
to Section 5.1.

         (iii) Upon the Reconciliation Date and in accordance with Treasury
Regulation Section 1.704-1(b)(2)(iv)(f), the Carrying Value of the Manta Ray
Phase I Facilities and the Boxer Line shall be adjudged to equal $50.3 million
and $4.1 million respectively. The excess of the Manta Ray Phase I Facilities'
adjudged value over the Carrying Value of the Manta Ray Phase I Facilities
immediately before the Reconciliation Date (the "Leviathan Reconciliation Date
Income") and the excess of the Boxer Line's adjudged value over the Carrying
Value of the Boxer Line immediately before the Reconciliation Date (the "Shell
Reconciliation Date Income") shall be allocated in accordance with Section
5.1(c).


                                       35
<PAGE>   41


                                   ARTICLE V.
                          ALLOCATIONS AND DISTRIBUTIONS

         5.1 ALLOCATIONS FOR CAPITAL ACCOUNT PURPOSES. In order to properly
reflect the business agreement by and among the Members, the intent of the
allocations in this Section 5.1 is to (i) treat each Member as if the Capital
Contributions of the Manta Ray Phase I Facilities and the Boxer Line were made
on the Reconciliation Date and (ii) solely for Capital Account maintenance and
federal income tax purposes income received from Manta Ray and Nautilus shall be
allocated as if derived from the operations of the Company. Therefore, for
purposes of maintaining the Capital Accounts and in determining the rights of
the Members among themselves, the Company's items of income, gain, loss and
deduction (computed in accordance with Section 4.5(b)) shall be allocated among
the Members in each taxable year (or portion thereof) as provided herein below.

         (a) Net Income. All items of income, gain, loss and deduction taken
into account in computing Net Income for such taxable period shall be allocated
to each of the Members in accordance with its respective Membership Interests;
provided, however, that, during the period beginning on the date hereof and
ending on the Reconciliation Date, (i) 100% of all income, gain, loss and
deduction taken into account in computing that portion of Net Income
attributable to Manta Ray Stub Period Income shall be specially allocated to
Leviathan Holding and (ii) 100% of all income, gain, loss and deduction taken
into account in computing that portion of Net Income attributable to Boxer Line
Stub Period Income shall be specially allocated to Shell Holding.

         (b) Net Losses. All items of income, gain, loss and deduction taken
into account in computing Net Losses for such taxable period shall be allocated
to each Member in accordance with its respective Membership Interests; provided,
however that, during the period beginning on the date hereof and ending on the
Reconciliation Date, (i) 100% of all income, gain, loss and deduction taken into
account in calculating Net Losses attributable to Manta Ray Stub Period Income
shall be specially allocated to Leviathan Holding and (ii) 100% of all income,
gain, loss and deduction taken into account in calculating Net Losses
attributable to Boxer Line Stub Period Income shall be specially allocated to
Shell Holding.

         (c) Special Allocation of Income. Notwithstanding the other provisions
of this Section 5.1,

                  (i) the Leviathan Reconciliation Date Income shall be
                  allocated solely to Leviathan Holding; and

                  (ii) the Shell Reconciliation Date Income shall be allocated
                  solely to Shell Holding.

         (d) Nonrecourse Liabilities. For purposes of Treasury Regulation
section 1.752-3(a)(3), the Members agree that Nonrecourse Liabilities of the
Company in excess of the sum of (A) the amount of Company Minimum Gain and (B)
the total amount of Nonrecourse Built-in


                                       36
<PAGE>   42

Gain shall be allocated among the Members in accordance with their respective
Membership Interests.

         (e) Company Minimum Gain Chargeback. Notwithstanding the other
provisions of this Section 5.1, except as provided in Treasury Regulation
section 1.704-2(f)(2) through (5), if there is a net decrease in Company Minimum
Gain during any Company taxable period, each Member shall be allocated items of
Company income and gain for such period (and, if necessary, subsequent periods)
in the manner and amounts provided in Treasury Regulation sections 1.704-2(f)(6)
and (g)(2) and section 1.704-2(j)(2)(i), or any successor provisions. For
purposes of this Section 5.1(d), each Member's Adjusted Capital Account balance
shall be determined, and the allocation of income or gain required hereunder
shall be effected, prior to the application of any other allocations pursuant to
this Section 5.1 with respect to such taxable period (other than an allocation
pursuant to Section 5.1(h) or (i)).

         (f) Chargeback of Minimum Gain Attributable to Member Nonrecourse Debt.
Notwithstanding the other provisions of this Section 5.1 (other than Section
5.1(d), except as provided in Treasury Regulation section 1.704-2(i)(4)), if
there is a net decrease in Minimum Gain Attributable to Member Nonrecourse Debt
during any Company taxable period, any Member with a share of Minimum Gain
Attributable to Member Nonrecourse Debt at the beginning of such taxable period
shall be allocated items of Company income and gain for such period (and, if
necessary, subsequent periods) in the manner and amounts provided in Treasury
Regulation sections 1.704-2(i)(4) and 1.704-2(j)(2)(ii), or any successor
provisions. For purposes of this Section 5.1, each Member's Adjusted Capital
Account balance shall be determined and the allocation of income or gain
required hereunder shall be effected, prior to the application of any other
allocations pursuant to this Section 5.1, other than Sections 5.1(d), (h) and
(i), with respect to such taxable period.

         (g) Qualified Income Offset. In the event any Member unexpectedly
receives adjustments, allocations or distributions described in Treasury
Regulation section 1.704-1(b)(2)(ii)(d)(4) through (6) (or any successor
provisions), items of Company income and gain shall be specifically allocated to
such Member in an amount and manner sufficient to eliminate, to the extent
required by the Treasury Regulations promulgated under section 704(b) of the
Code, the deficit balance, if any, in its Adjusted Capital Account created by
such adjustments, allocations or distributions as quickly as possible unless
such deficit balance is otherwise eliminated pursuant to Section 5.1(d) or
5.1(e).

         (h) Gross Income Allocations. In the event any Member has a deficit
balance in its Adjusted Capital Account at the end of any Company taxable period
which is in excess of the sum of (i) the amount such Member is obligated to
restore pursuant to any provision of this Agreement and (ii) the amount such
Member is deemed obligated to restore pursuant to the penultimate sentences of
Treasury Regulations sections 1.704-2(g)(1) and 1.704-2(i)(5), such Member shall
be specifically allocated items of Company gross income and gain in the amount
of such excess as quickly as possible; provided that an allocation pursuant to
this Section 5.1(g) shall be made only if and to the extent that such Member
would have a deficit balance in its Adjusted Capital Account after all other
allocations provided in this Section 5.1 have been tentatively made as if this
Section 5.1(g) was not in the Agreement.


                                       37
<PAGE>   43

         (i) Nonrecourse Deductions. Nonrecourse Deductions for any taxable
period shall be allocated to the Members in accordance with their respective
Membership Interests. If the Company determines in its good faith discretion
that the Company's Nonrecourse Deductions must be allocated in a different ratio
to satisfy the safe harbor requirements of the Treasury Regulations promulgated
under section 704(b) of the Code, the Company is authorized, upon notice to the
Members, to revise the prescribed ratio to the numerically closest ratio which
does satisfy such requirements.

         (j) Member Nonrecourse Deductions. Member Nonrecourse Deductions for
any taxable period shall be allocated 100% to the Member that bears the Economic
Risk of Loss for such Member Nonrecourse Debt to which such Member Nonrecourse
Deductions are attributable in accordance with Treasury Regulation section
1.704-2(i) (or any successor provision). If more than one Member bears the
Economic Risk of Loss with respect to a Member Nonrecourse Debt, such Member
Nonrecourse Deductions attributable thereto shall be allocated between or among
such Members ratably in proportion to their respective shares of such Economic
Risk of Loss.

         5.2 ALLOCATIONS FOR TAX PURPOSES.

         (a) Except as otherwise provided herein, for federal income tax
purposes, each item of income, gain, loss and deduction which is recognized by
the Company for federal income tax purposes shall be allocated among the Members
in the same manner as its correlative item of "book" income, gain, loss or
deduction is allocated pursuant to Section 5.1 hereof.

         (b) In an attempt to eliminate Book-Tax Disparities attributable to a
Contributed Property or Adjusted Property, items of income, gain, loss,
depreciation, amortization and cost recovery deductions shall be allocated for
federal income tax purposes among the Members as follows:

                  (i) (A) In the case of a Contributed Property, such items
         attributable thereto shall be allocated among the Members in the manner
         provided under section 704(c) of the Code and section 1.704-3(b) of the
         Treasury Regulations (i.e. the "traditional method") that takes into
         account the variation between the Asset Value of such property and its
         adjusted basis at the time of contribution; and (B) except as otherwise
         provided in Section 5.2(b)(iii), any item of Residual Gain or Residual
         Loss attributable to a Contributed Property shall be allocated among
         the Members in the same manner as its correlative item of "book" gain
         or loss is allocated pursuant to Section 5.1.

                  (ii) (A) In the case of an Adjusted Property, such items shall
         (1) first, be allocated among the Members in a manner consistent with
         the principles of section 704(c) of the Code and section 1.704-3(b) of
         the Treasury Regulations (i.e. the "traditional method") to take into
         account the Unrealized Gain or Unrealized Loss attributable to such
         property and the allocations thereof pursuant to Section 4.5(d)(i),
         (ii), or (iii) and (2) second, in the event such property was
         originally a Contributed Property, be allocated among the Members in a
         manner consistent with Section 5.2(b)(i); and (B) except as otherwise
         provided in Section 5.2(b)(iii), any item of Residual Gain or Residual
         Loss


                                       38
<PAGE>   44

         attributable to an Adjusted Property shall be allocated among the
         Members in the same manner as its correlative item of "book" gain or
         loss is allocated pursuant to Section 5.1.

                  (iii) Any items of income, gain, loss or deduction otherwise
         allocable under Section 5.2(b)(i)(B) or 5.2(b)(ii)(B) shall be subject
         to allocation by the Company in a manner designed to eliminate, to the
         maximum extent possible, Book-Tax Disparities in a Contributed Property
         or Adjusted Property otherwise resulting from the application of the
         "ceiling" limitation (under section 704(c) of the Code or section
         704(c) principles) to the allocations provided under Sections
         5.2(b)(i)(A) and 5.2(b)(ii)(A).

         (c) For the proper administration of the Company, the Company shall (i)
adopt such conventions as it deems appropriate in determining the amount of
depreciation, amortization and cost recovery deductions; provided, that such
depreciation, amortization and cost recovery methods shall be the most
accelerated methods allowed under federal tax laws]; (ii) make special curative
allocations for federal income tax purposes of income (including, without
limitation, gross income) or deductions pursuant to section 1.704-3(c) of the
Treasury Regulations to eliminate the impact of the "ceiling" limitation (under
section 704(c) of the Code and section 704 principles) to the allocations
provided in Section 5.2(b); and (iii) amend the provisions of this Agreement as
appropriate to reflect the proposal or promulgation of Treasury Regulations
under section 704(b) or section 704(c) of the Code. The Company may adopt such
conventions, make such allocations and make such amendments to this Agreement as
provided in this Section 5.2(c) only if such conventions, allocations or
amendments are consistent with the principles of section 704 of the Code.

         (d) The Company may determine to depreciate the portion of an
adjustment under section 743(b) of the Code attributable to unrealized
appreciation in any Adjusted Property (to the extent of the unamortized Book-Tax
Disparity) using a predetermined rate derived from the depreciation method and
useful life applied to the Company's common basis of such property, despite the
inconsistency of such with Proposed Treasury Regulation section 1.168-2(n) and
Treasury Regulation section 1.167(c)-1(a)(6), or any successor provisions. If
the Company determines that such reporting position cannot reasonably be taken,
the Company may adopt any reasonable depreciation convention that would not have
a material adverse effect on the Members.

         (e) Any gain allocated to the Members upon the sale or other taxable
disposition of any Company asset shall, to the extent possible, after taking
into account other required allocations of gain pursuant to this Section 5.2 be
characterized as Recapture Income in the same proportions and the same extent as
such Members (or their predecessors in interest) have been allocated any
deductions directly or indirectly giving rise to the treatment of such gains as
Recapture Income.

         (f) All items of income, gain, loss, deduction and credit recognized by
the Company for federal income tax purposes and allocated to the Members in
accordance with the provisions hereof shall be determined without regard to any
election under section 754 of the Code which may be made by the Company;
provided, however, that such allocations, once made, shall be


                                       39

<PAGE>   45

adjusted as necessary or appropriate to take into account those adjustments
permitted or required by sections 734 and 743 of the Code.

         5.3 REQUIREMENT OF DISTRIBUTIONS. Subject to the provisions of Sections
5.6 and 7.2, and less the amount of the cash reserves, if any, set aside
pursuant to Section 5.5, the Company shall distribute (within 30 days following
the end of each calendar month) such amount of Available Cash, as determined by
the Members, to the Members who were Record Holders as of the Record Date in
accordance with their respective Membership Interests (except as otherwise
provided in Section 5.7).

         5.4 PRO RATA DISTRIBUTIONS. Except for preferential or disproportionate
distributions to the extent expressly provided for in this Agreement (including
those set forth in Section 12.2), any distributions attributable to the
Membership Interests of the Company paid in cash, property, or equity ownership
of the Company shall be allocated pro rata according to Membership Interest.

         5.5 RESERVES. Before payment of any Distributions, there may be set
aside out of any funds of the Company available for distributions such sum or
sums as the Members from time to time, in their absolute discretion, think
proper as a cash reserve or reserves to meet contingencies, for repairing or
maintaining any property of the Company, or for such other purpose as the
Members shall determine to be in the best interest of the Company; and the
Company may modify or abolish any such cash reserve in the manner in which it
was created. Any reserves established by Manta Ray or Nautilus shall be
considered in determining the appropriate reserve for the Company.

         5.6 DISTRIBUTION RESTRICTIONS. Unless unanimously agreed to in writing
by the Members, and subject to the provisions of Section 4.3, the Company shall
not distribute (i) any of the Initial Capital Contributions until the completion
of the construction of the Manta Ray Phase II Facilities and the Nautilus
Initial Facilities, except to the extent that all of the Members agree that the
applicable portion of such Initial Capital Contributions is no longer needed to
finance such construction or the operations of the Company, or (ii) any amounts
that would cause the Company, Manta Ray or Nautilus to materially breach, or
would create a material default under, any debt agreements or instruments to
which the Company, Manta Ray or Nautilus is a party.

         5.7 SPECIAL DISTRIBUTIONS AND CONTRIBUTIONS. Notwithstanding anything
herein to the contrary, including the provisions of this Article V, on or before
the fifteenth Business Day of each calendar month, Company shall deliver to
Shell Holding and Leviathan Holding a statement setting forth in detail the
amounts specially allocated to Shell Holding or Leviathan Holding as Boxer Line
Stub Period Income or Manta Ray Stub Period Income, as the case may be, pursuant
to Section 5.1(a) and (b). If the Boxer Line Stub Period Income or the Manta Ray
Stub Period Income for the preceding calendar month (exclusive of non-cash items
such as depreciation and amortization) is a positive number, then the Company
will make a special distribution of such net amount to Shell Holding and/or
Leviathan Holding, as applicable, on or before the 25th day of the calendar
month in which the statement is delivered. If the Boxer Line Stub Period Income
or Manta Ray Stub Period Income for the preceding calendar month (exclusive of
non-cash items such as depreciation and amortization) is a negative number, then
Shell Holding or Leviathan


                                       40
<PAGE>   46

Holding, as applicable, will make an additional Capital Contribution to the
Company of such net amount on or before the 25th day of the calendar month in
which the statement is delivered. Any such distribution or contribution shall
not prejudice the right of the paying party to an adjustment of any statement.
Shell Holding and Leviathan Holding and its authorized representatives shall
have the right to inspect any records of the Company forming the basis for a
statement delivered to it, and the Company agrees to retain such records, for 36
months from the end of the calendar year in which the applicable statement was
delivered.

                                  ARTICLE VI.
                            MANAGEMENT OF THE COMPANY

         6.1 MANAGEMENT BY THE MEMBERS AND DELEGATION OF AUTHORITY. The Members
hereby unanimously agree that the business and affairs of the Company shall be
managed by or under the authority of the Members in accordance with the Act,
which Members may act through their directors, officers, employees,
representatives, agents and designees. Except for situations in which the
approval of the Members is required by this Agreement or by nonwaivable
provisions of applicable Laws, the Members shall have broad discretion to
authorize any committee constituted pursuant to Section 6.2 or any officer or
other agent to act on behalf of the Company.

         6.2 COMMITTEES. For organizational purposes, the Members may form one
or more committees of the Members. Each Member shall appoint one (or more) of
its duly authorized agents to act for the Member on any committee of the
Company. Such agents of each Member shall be given the authority by such Member
to vote on behalf of the Member on any issue within the committee's
responsibility and the agent(s) of each Member shall have the right to vote on
behalf of such Member in proportion to such Member's Membership Interest.

         6.3 AUTHORITY OF MEMBERS AND COMMITTEES.

         (a) With respect to conflicts or disagreements between and among any
committees, the Members shall have ultimate decision making authority. The
Members and the committees shall act through the Company's officers, employees,
representatives, agents and designees to whom authority has been expressly
delegated. All action of the Members shall be taken pursuant to resolutions
approved by the Members in accordance with Article VII of this Agreement.

         (b) Unless otherwise expressly delegated in writing or provided by this
Agreement, the Members hereby reserve to the Members as a group the authority,
with respect to the Company, to authorize and approve the following, or, with
respect to matters to be authorized or approved by Subsidiaries of the Company,
to determine how the Company will vote as a member of such Subsidiary, with
respect to the following:

                  (i) authorizing Gas Contracts the term of which could be
         longer than one year after the date of execution thereof; provided,
         however, that, with respect to the Manta Ray System, Leviathan Holding
         shall have the right to override and reverse any vote by the Members
         made on or before the expiration of the Termination Time so long as
         Leviathan Holding does not obligate Manta Ray to incur any construction
         costs;


                                       41
<PAGE>   47

                  (ii) authorizing any contract, agreement or other undertaking
         involving more than $500,000 in any year or $1,000,000 in the
         aggregate;

                  (iii) authorizing a transaction involving the acquisition or
         construction of any pipeline, lateral or extension, including a Lateral
         in accordance with Article XV, or any compression, expansion or other
         significant facilities;

                  (iv) authorizing a transaction involving a lease or similar
         arrangement which either (A) involves an asset with a fair market value
         of more than $500,000 or (B) could reasonably be expected to result in
         payments in excess of $500,000;

                  (v) approving any operating and capital expenditures budgets;

                  (vi) authorizing any transaction, including, without
         limitation, any purchase, sale, lease or exchange of property or the
         rendering of any service, involving the Company or its Subsidiaries and
         any Member or any Affiliate of any Member (which transaction, once
         approved by all of the Members, shall be presumed to be fair to the
         Company or such Subsidiary, as the case may be);

                  (vii) authorizing borrowing money;

                  (viii) authorizing transactions not in the ordinary course of
         business;

                  (ix) determining the cash reserve applicable to distributions
         of cash and other property as provided in Sections 5.3, 5.5 and 5.6;

                  (x) utilizing for other than company purposes, acquiring, or
         disposing of any material asset of the Company or its Subsidiaries;

                  (xi) permitting a member of the Company or any of its
         Subsidiaries to resign;

                  (xii) permitting the merger, consolidation, participation in a
         share exchange or other statutory reorganization with, or sale of all
         or substantially all of the assets of the Company or its Subsidiaries
         to, or the sale or other transfer or alienation of any interest in
         Manta Ray or Nautilus to, any Person;

                  (xiii) permitting dissolution and liquidation;

                  (xiv) approving the Construction Certificate, the Nautilus
         FERC tariff, the applications for the Construction Certificate, the
         FERC Certificate and any subsequent FERC certificate, including any
         amendment or modifications of any FERC certificate, approving any
         material amendments or other material modifications to the Construction
         Certificate, the Nautilus FERC tariff, the FERC Certificate or any
         subsequent FERC certificate, including, without limitation, the general
         terms and conditions and the rates and the basis upon which such rates
         are calculated, or accepting the Construction Certificate, the FERC
         Certificate or any subsequent FERC certificate;


                                       42
<PAGE>   48

                  (xv) instituting litigation, arbitration, or similar
         proceedings at a cost to the Company which could reasonably be expected
         to exceed $250,000; provided, however, that if any Member or any
         Affiliate of a Member is an adverse party thereto, then all of the
         remaining Members which are not Affiliates of the affected Member shall
         be entitled to cause the Company to institute such action, but once
         such action has been instituted, all of such remaining Members must
         agree prior to the settlement of any such action. Such non-Affiliate
         Members' vote shall be sufficient to take such actions under this
         Section even if such Membership Interest is less than a Majority
         Interest;

                  (xvi) changing the name of the Company or its Subsidiaries;

                  (xvii) approval, waiver, amendment or other modification
         (other than termination) of any Operating Agreement or any other
         operating agreement with respect to the operation of the Manta Ray
         System or the Nautilus System or any management or similar agreement
         with respect to the operation of the Company; and

                  (xviii) termination (other than by expiration of the term
         thereof) of any Operating Agreement or any other operating agreement
         with respect to the operation of the Manta Ray System or the Nautilus
         System or of the Company; provided, however that for purposes of this
         Section 6.3(b)(xviii), if any Member or its Affiliate (as such term is
         defined in the Operating Agreements or Construction Agreements in
         question) which would be replaced as an operator as a result of such
         termination, such Member shall not be entitled to vote on such
         termination. The vote of such non-replaced Members shall be sufficient
         to take such actions under this Section even if such Membership
         Interest is less than a Majority Interest;

         With respect to each matter described in (i) - (xviii) above, the
exercise of Member authority shall occur only by the affirmative vote of the
applicable Required Interest specified elsewhere in this Agreement, including,
without limitation, the unanimous voting requirements set forth in Section
7.2(b); the Super-Majority Interest voting requirements set forth in Section
7.2(a), and the Majority Interest voting requirements set forth in Section
7.1(a). Member approval or disapproval of any matter requiring Member approval
(including, without limitation, the matters set forth in this Section 6.3(b) and
Sections 7.2(a) and (b)) may be based on any reason whatsoever, in each Member's
sole and absolute discretion.

         6.4 OFFICERS.

         (a) The Members may designate one or more Persons to fill one or more
officer positions of the Company. Such officers may include, without limitation,
Chief Executive Officer, Chief Financial Officer, President, Vice President,
Treasurer, Assistant Treasurer, Secretary and Assistant Secretary. No officer
need be a resident of the State of Delaware. The Members may assign titles to
particular officers. Each officer shall hold office until his successor shall be
duly designated and shall qualify to hold such office, or until his death or
until he shall resign or shall have been removed in the manner hereinafter
provided. Any number of offices may be held by the same Person. The salaries or
other compensation, if any, of the officers and agents of the Company may be
fixed from time to time by the Members. Notwithstanding any


                                       43
<PAGE>   49

other provisions of this Agreement, the authority of any officers, employees or
agents of the Company shall be restricted to the carrying on of the day-to-day
affairs of the Company and any such authority shall be subject to the
supervisory control of the Members. Only Members or their duly authorized agents
shall have the authority to make policy decisions for the Company. Unless the
Members decide otherwise, the assignment of such title shall constitute the
delegation to such officer of the authority and duties set forth below:

                  (i) President. Unless otherwise specified by the Members, the
         President shall be the chief operating officer of the Company and have
         general executive powers to manage the operations of the Company, and
         such other powers and duties under this Agreement as the Members may
         from time to time prescribe.

                  (ii) Vice Presidents. In the absence of the President, or in
         the event of his inability to act, the Vice President (or in the event
         there be more than one Vice President, the Vice Presidents in the order
         designated by the Members, or in the absence of any such designation,
         then in the order of their election or appointment) shall perform the
         duties of the President, and when so acting, shall have all the powers
         of and be subject to all the restrictions upon the President.

                  (iii) Secretary. The Secretary shall keep the minutes of the
         meetings of the Company and shall exercise general supervision over the
         files of the Company. The Secretary shall give notice of meetings and
         shall perform other duties commonly incident to such office.

                  (iv) Assistant Secretary. At the request of the Secretary or
         in the Secretary's absence or inability to act, the Assistant Secretary
         shall perform part or all of the Secretary's duties.

                  (v) Treasurer. The Treasurer shall have general supervision of
         the funds, securities, notes, drafts, acceptances, and other commercial
         paper and evidences of indebtedness of the Company and he shall
         determine that funds belonging to the Company are kept on deposit in
         such banking institutions as the Members may from time to time direct.
         The Treasurer shall determine that accurate accounting records are
         kept, and the Treasurer shall render reports of the same and of the
         financial condition of the Company to the Members at any time upon
         request. The Treasurer shall perform other duties commonly incident to
         such office, including, but not limited to, the execution of tax
         returns.

                  (vi) Assistant Treasurer. At the request of the Treasurer or
         in the Treasurer's absence or inability to act, the Assistant Treasurer
         shall perform part or all of the Treasurer's duties.

         (b) Any officer may resign as such at any time. Such resignation shall
be made in writing and shall take effect at the time specified therein, or if no
time be specified, at the time of its receipt by the Company. The acceptance of
a resignation shall not be necessary to make it effective, unless expressly so
provided in the resignation. Any officer may be removed as such,


                                       44

<PAGE>   50

either with or without cause, by the Members; provided, however, that such
removal shall be without prejudice to the contract rights, if any, of the
officer so removed. Designation of an officer shall not of itself create
contract rights. Any vacancy occurring in any office of the Company may be
filled by the Members.

         6.5 DUTIES OF OFFICERS. Each officer shall devote such time, effort,
and skill to the Company's business affairs as he deems necessary and proper for
the Company's welfare and success. The Members expressly recognize that the
officers have substantial other business relationships and activities with
Persons other than the Company.

         6.6 NO DUTY TO CONSULT. Except as otherwise provided herein or by
applicable law, neither the Company nor its duly appointed agents, designees or
representatives or the officers of the Company shall have a duty or obligation
to consult with or seek advice of the Members on any matter relating to the
day-to-day business affairs of the Company duly delegated to such Persons;
provided, however, that such Persons shall not be restricted from consulting
with or seeking the advice of the Members.

         6.7 REIMBURSEMENT. Except for pre-formation expenses paid by each
respective Member and treated as a Capital Contribution pursuant to Section
4.1(a), all expenses incurred with respect to the organization, operation and
management of the Company shall be borne by the Company.

         6.8 MEMBERS AND AFFILIATES DEALING WITH THE COMPANY. Subject to
obtaining any consent expressly required hereunder, the Company may appoint,
employ, contract, or otherwise deal with any Person, including Affiliates of the
Members, individuals with whom the Members are otherwise related, and with
business entities which have a financial interest in a Member or in which a
Member has a financial interest, for transacting Company business, including any
acts or services for the Company as the members of any committee, officer or
other representative with the proper authority may approve.

         6.9 INSURANCE. Neptune shall make available to the Company the full
amount of Neptune's insurance program described on "Exhibit C.I.A. through D" of
the Neptune Limited Liability Company Agreement as if the Company was an
additional insured.

         The Company shall provide the insurance coverage as outlined on
"Exhibit C" of this Agreement.

         All insurance policies shall provide that the insurers waive their
right of subrogation against the Company, Neptune, Manta Ray, Nautilus,
Leviathan Holding, Marathon Holding and Shell Holding, any of their Affiliates,
or any other party indemnified by Company.



                                       45
<PAGE>   51


                                  ARTICLE VII.
                                    MEETINGS

         7.1 MEETINGS OF MEMBERS AND COMMITTEES.

         (a) A quorum shall be present at a meeting of Members or any committee
of the Company if the holders of at least a Majority Interest are represented at
the meeting in person or by proxy. At a meeting of the Members at which a quorum
is present with respect to any matter (except for any matter expressly requiring
the affirmative vote of a Required Interest greater than a Majority Interest
pursuant to this Agreement), the affirmative vote of the Majority Interest shall
be the act of the Members.

         (b) All meetings of the Members or any committee of the Company shall
be held at the principal place of business of the Company or at such other place
within or without the State of Delaware as shall be specified or fixed in the
notices or waivers of notice thereof; provided that any or all Members or their
representatives may participate in any such meeting by means of conference
telephone or similar communications equipment pursuant to Section 16.11. No
Member shall willfully be absent from any meeting of the Members or any
committee of the Company.

         (c) Notwithstanding the other provisions of this Agreement, the holders
of at least a majority of the Membership Interest represented (in person or by
proxy) at a meeting at which a quorum is present shall have the power to adjourn
such meeting from time to time, without any notice other than an announcement at
the meeting of the time and place of the resumption of the adjourned meeting.
The time and place of such adjournment shall be determined by a vote of such
Membership Interest. Upon the resumption of such adjourned meeting, any business
may be transacted that might have been transacted at the meeting as originally
called.

         (d) Unless otherwise expressly provided in a written notice issued by
the Members, an annual meeting of the Members for the transaction of such
business as may properly come before such meeting shall be held at the principal
office of the Company at 10:00 a.m. on the second Tuesday which is a Business
Day in the month of April. Regularly scheduled, periodic meetings of the Members
or any committee of the Company may be held without notice to the Members or
Member representatives at such times and places as shall from time to time be
determined by resolution of the Members or such Member representatives and
communicated to all Members or their representatives. Each Member, or its
representatives in the case of committee meetings, shall use reasonable efforts
to inform the other Members or committee representatives of any business matters
that it intends to raise at any regular meeting of the Members or any committee
of the Company within a reasonable time prior to such meeting.

         (e) Special meetings of the Members or any committee of the Company,
for any purpose or purposes, unless otherwise prescribed by law, shall be called
by (i) the President or Secretary (if any), (ii) any one or more Members holding
at least 20% of the Membership Interests of the Company in the aggregate or
(iii) any two or more non-Affiliated Members. Such request of the President,
Secretary or Member(s) shall state the purpose or purposes of the proposed
meeting.


                                       46
<PAGE>   52

         (f) Except as provided otherwise by this Agreement or applicable law,
written or printed notice stating the place, day and hour of the meeting and the
purpose or purposes for which such meeting is called, shall be delivered not
less than ten (10) nor more than sixty (60) days (including Saturdays, Sundays
and holidays) before the date of the proposed meeting, either personally, by
certified mail (return receipt requested) or by telecopy (with a copy delivered
via United States mail), by or at the direction of the Person calling the
meeting, to each Member or Member representative, as the case may be, entitled
to vote thereat. If mailed, any such notice shall be deemed to be delivered when
deposited in the United States mail, addressed to the Member, or Member
representative, at its address provided for in Section 16.19, with postage
thereon prepaid.

         (g) The date on which notice of a meeting of the Members or any
committee of the Company is mailed shall be the Record Date for the
determination of the Members or Member representatives entitled to notice of or
to vote at such meeting, including any adjournment thereof, or the Members or
Member representatives entitled to receive such notice.

         7.2 SPECIAL ACTIONS.

         (a) The approval of the holders of a Super-Majority Interest of the
Members shall be required to authorize and approve the following, or, with
respect to matters to be authorized or approved by Subsidiaries of the Company,
to determine how the Company will vote as a member of such Subsidiary with
respect to the following:

                  (i) except with respect to cash reserves consistent with
         historical practices, determining the cash reserves applicable to
         distributions of cash and other property as provided in Sections 5.3,
         5.5 and 5.6, other than (A) cash reserves relating to acquiring,
         constructing or otherwise obtaining (including, without limitation,
         pursuant to a lease or similar arrangement approved in accordance with
         Section 7.2(a)(v)) any pipeline, lateral or extension, including any
         Lateral or any compression, expansion or other significant facilities
         if such reserve exceeds, at any one time $500,000, but is less than or
         equal to $5,000,000 (the authorization for which requires at least a
         Majority Interest) or (B) cash reserves described in Section 7.2(a)(ii)
         (requiring at least a Super Majority Interest) or Section 7.2(b)(xv)
         (requiring unanimity);

                  (ii) determining the cash reserves applicable to distributions
         of cash and other property as provided in Sections 5.3, 5.5 and 5.6, to
         the extent such cash reserves (A) relate to acquiring, constructing,
         leasing or otherwise obtaining any pipeline, lateral or extension,
         including any Lateral or any compression, expansion or other
         significant facilities and (B) exceed, at any one time, $5,000,000, but
         is less than or equal to $15,000,000;

                  (iii) (A)entering into any credit agreement, indenture or
         similar agreement or (B) borrowing money or making draws under any such
         previously approved credit agreement, indenture or similar agreement
         for the purpose of funding authorized transactions with an approved
         cost to the Company of more than $5,000,000, but less than or equal to
         $15,000,000;


                                       47
<PAGE>   53

                  (iv) utilizing other than for Company purposes, acquiring or
         disposing of any asset of the Company or its Subsidiaries having a then
         existing fair market value or GAAP net book value (after deducting
         accumulated depreciation, depletion, amortization and impairment) of
         more than $5,000,000 but less than or equal to $15,000,000;

                  (v) authorizing a transaction involving a lease or similar
         arrangement which either (A) involves an asset with a fair market value
         of more than $5,000,000 but less than or equal to $15,000,000 or (B)
         could reasonably be expected to result in payments of more than
         $5,000,000 but less than or equal to $15,000,000;

                  (vi) authorizing a transaction which involves acquiring,
         constructing or otherwise obtaining any pipeline, lateral or extension,
         including any Lateral, or any compression, expansion or other
         significant facilities, which could reasonably be expected to have a
         cost to the Company or any Subsidiary of more than $5,000,000 but less
         than or equal to $15,000,000.

         (b) The approval of the holders of all of the Membership Interest of
the Members shall be required to authorize and approve the following, or, with
respect to matters to be authorized or approved by Subsidiaries of the Company,
to determine how the Company will vote as a member of such Subsidiary with
respect to the following:

                  (i) approving the Nautilus FERC tariff, the applications for
         the FERC Certificate or any subsequent FERC certificate, including any
         amendment or modifications of any FERC certificate and approving any
         material amendments or other material modifications to the Nautilus
         FERC tariff, the FERC Certificate or any subsequent FERC certificate,
         including, without limitation, the general terms and conditions and the
         rates and the basis upon which such rates are calculated;

                  (ii) accepting the Construction Certificate (which approval
         shall also be deemed to be an approval of the FERC Certificate, unless,
         at the time Nautilus receives the FERC Certificate, all of the Members
         agree that such FERC Certificate should be rejected);

                  (iii) approval, waiver, amendment or other modification (other
         than termination) of any Construction Agreement or Operating Agreement
         or any other operating agreement with respect to the operation of the
         Manta Ray System or the Nautilus System;

                  (iv) termination (other than by expiration of the term
         thereof) of any Construction Agreement or Operating Agreement or any
         other operating agreement with respect to the operation of the Manta
         Ray System or the Nautilus System or of the Company; provided, however
         that for purposes of this Section 7.2(b)(iv), if any Member or its
         Affiliate (as such term is defined in the Operating Agreement or
         Construction Agreement in question) would be replaced as an operator as
         a result of such termination, such Member shall not be entitled to vote
         on such termination. The vote of such Members


                                       48
<PAGE>   54

         not terminated shall be sufficient to take such actions under this
         Section even if such Membership Interest is less than a Majority
         Interest;

                  (v) changing the name of the Company or any of its
         Subsidiaries;

                  (vi) instituting litigation, arbitration, or similar
         proceedings against Persons other than any Member or any Affiliate of
         any Member at a cost to the Company which could reasonably be expected
         to exceed $250,000;

                  (vii) making draws under any credit agreement, indenture or
         similar agreement approved in accordance with the terms of Section
         7.2(a)(iii)(A), for the purpose of funding authorized transactions with
         an approved cost to the Company of more than $15,000,000;

                  (viii) utilizing other than for company purposes, acquiring or
         disposing of any asset of the Company or its Subsidiaries, having a
         then existing fair market value or GAAP net book value (after deducting
         accumulated depreciation, depletion, amortization and impairment) of
         more than $15,000,000;

                  (ix) authorizing a transaction which involves acquiring,
         constructing or otherwise obtaining any pipeline, lateral or extension,
         including any Lateral, or any compression, expansion or other
         significant facilities, which could reasonably be expected to have a
         cost to the Company or any Subsidiary of more than $15,000,000;

                  (x) authorizing a transaction involving a lease or similar
         arrangement which either (A) involves an asset with a fair market value
         of more than $15,000,000 or (B) could reasonably be expected to result
         in payments of more than $15,000,000;

                  (xi) authorizing any transaction or any amendment thereto,
         including, without limitation, any purchase, sale, lease or exchange of
         property or the rendering of any service involving the Company or any
         of its Subsidiaries and any Member or any Affiliate of any Member
         (which transaction, once approved by all of the Members, shall be
         presumed to be fair to the Company); and

                  (xii) authorizing material transactions the nature of which
         are not in the ordinary course of business;

                  (xiii) permitting the merger, consolidation, or participation
         in a share exchange or other statutory reorganization with, or sale of
         all or substantially all of the assets of Manta Ray, Nautilus or the
         Company to, or the sale or other transfer or alienation (other than
         granting a lien or other Security Interest) of any interest in Manta
         Ray or Nautilus to, any Person;

                  (xiv) approving the operating and capital expenditure budgets
         of the Company or any of its Subsidiaries covering the period from the
         date hereof until the first anniversary of such date;


                                       49
<PAGE>   55

                  (xv) approving any cash reserve applicable to distributions of
         cash and other property as provided in Sections 5.3, 5.5 and 5.6, to
         the extent such cash reserve (A) relates to acquiring, constructing or
         otherwise obtaining (including, without limitation, pursuant to a lease
         or similar arrangement approved in accordance with Section 7.2(b)(x))
         any pipeline, lateral or extension, including any Lateral, or any
         compression, expansion or other significant facilities and (B) exceeds,
         at any one time, $15,000,000;

                  (xvi) hiring any employees of the Company;

                  (xvii) admitting any new Member to any Subsidiary of the
         Company; and

                  (xviii) actions for which this Agreement otherwise expressly
         requires unanimous approval, including, without limitation, any of the
         actions set forth in Sections 3.10 (creation of additional Membership
         Interests), 3.14 (Resignation), 4.2 (subsequent Capital Contributions),
         5.6 (distribution of Initial Capital Contributions), 12.1(a)
         (Dissolution and Liquidation) and 13.2 (Amendments).

         7.3 VOTING LIST. The officer of the Company or the designated Member
who is responsible for the maintenance of the Company's records shall make, at
least ten days before each meeting of Members, a complete list of the Members or
their representatives, as the case may be, entitled to vote thereat or any
adjournment thereof, arranged in alphabetical order, with the address of and the
Membership Interest held or represented by each, which list, for a period of ten
days prior to such meeting, shall be kept on file at the registered office or
principal place of business of the Company and shall be subject to inspection by
any Member or Member representative at any time during usual business hours.
Such list shall also be produced and kept open at the time and place of the
meeting and shall be subject to the inspection of any Member or Member
representative during the whole time of the meeting. The original Company
records shall be prima facie evidence as to who are the Members or their
representatives entitled to examine such list or transfer records or to vote at
any meeting of Members. Failure to comply with the requirements of this Section
shall not affect the validity of any action taken at the meeting.

         7.4 PROXIES. A Member or Member representative may vote either in
person or by proxy executed in writing by the Member or Member representative. A
telegram, telex, cablegram or similar transmission by the Member or Member
representative or a photographic, photostatic, facsimile or similar reproduction
of writing executed by the Member or Member representative shall be treated as
an execution in writing for purposes of this Section. Proxies for use at any
meeting of the Members or committee of the Company or in connection with the
taking of any action by written consent shall be filed with the Company before
or at the time of the meeting or execution of the written consent, as the case
may be. All proxies shall be received and taken charge of and all ballots shall
be received and canvassed by an inspector or inspectors appointed by the
President or a Vice President of the Company who shall decide all questions
touching upon the qualification of voters, the validity of the proxies, and the
acceptance or rejection of votes.


                                       50
<PAGE>   56

         7.5 VOTES. Each Member or Member representative shall be entitled to
one vote (or a fraction thereof) per percent (or fraction thereof) of Membership
Interest held by such Member, as reflected in the transfer records of the
Company; provided, however, that for purposes of determining a quorum or a
Required Interest the Membership Interest of any Member shall not be counted and
such interest shall be apportioned by interest among the remaining Members as
applicable if the Member is not permitted to vote under this Agreement for any
reason, including, without limitation, the relevant Member is in Default, is not
deemed to be a Substituted Member or is in breach of certain representations and
warranties; provided, however, that no Member shall be required to make any
Capital Contribution, other than an Initial Capital Contribution, if such Member
did not vote to approve such Capital Contribution in accordance with Section
4.2.

         7.6 CONDUCT OF MEETINGS. All meetings of the Members or committees of
the Company shall be presided over by the chairman of the meeting, who shall be
designated by, in order of priority, the President, the Vice President or other
appropriate officer of the Company. The chairman of any meeting of Members or
committee of the Company shall determine the order of business and the procedure
at the meeting, including regulation of the manner of voting and the conduct of
discussion.

         7.7 ACTION BY WRITTEN CONSENT.

         (a) Except as otherwise provided by applicable Laws, any action
required or permitted to be taken at any meeting of Members or committee of the
Company may be taken without a meeting, and without a vote, if a consent or
consents in writing, setting forth the action so taken, shall be signed by the
holder or holders or representatives of not less than the minimum of Membership
Interests that would be necessary to take such action at a meeting at which the
holders of all Membership Interests entitled to vote on the action were present
and voted; provided, however, that no such written consent shall be effective
unless each Member has been provided with at least 3 Business Days prior written
notice of such consent to be sought or has waived the requirement of such
notice. To the extent required by law, every written consent shall bear the date
of signature of each Member or Member representative who signs the consent. To
the extent required by law, no written consent shall be effective to take the
action that is the subject of such consent unless, within 60 days after the date
of the earliest dated consent delivered to the Company in the manner required by
this Section 7.7, a consent or consents signed by the holder or holders of not
less than the minimum Membership Interests that would be necessary to take the
action that is the subject of the consent are delivered to the Company by
delivery to its registered office or its principal place of business. Delivery
shall be by hand or certified or registered mail (return receipt requested) to
the Company's principal place of business and shall be addressed to the
Secretary of the Company. A telegram, telex, cablegram or similar transmission
by a Member or Member representative, or a photographic, photostatic, facsimile
or similar reproduction of a writing signed by a Member or Member
representative, shall be regarded as signed by the Member or Member
representative for purposes of this Section 7.7. In addition to the prior
written notice described above, prompt written notice of the taking of any
action by the Members or committees of the Company without a meeting by less
than unanimous written consent shall be given to those Members or Member
representatives who did not consent in writing to the action.


                                       51
<PAGE>   57


         (b) The Record Date for determining Members or their representatives
entitled to consent to an action in writing without a meeting shall be the first
date on which a signed written consent setting forth the action taken or
proposed to be taken is delivered to the Company. Delivery of such written
consent shall be by hand or by certified or registered mail (return receipt
requested) to the Company's principal place of business and shall be addressed
to the Secretary of the Company.

         7.8 RECORDS. An officer of the Company or a designated Member
representative shall be responsible for maintaining the records of the Company,
including keeping minutes at the meetings of the Members or committees of the
Company and the filing of consents in the records of the Company.


                                 ARTICLE VIII.
                                INDEMNIFICATION

         8.1 RIGHT TO INDEMNIFICATION. Subject to the limitations and conditions
as provided herein or by applicable Laws, each Person who was or is made a party
or is threatened to be made a party to or is involved in any threatened, pending
or completed action, suit or proceeding, whether civil, criminal,
administrative, arbitrative or investigative (hereinafter a "Proceeding"), or
any appeal in such a Proceeding or any inquiry or investigation that could lead
to such a Proceeding, by reason of the fact that he or she, or a Person of whom
he or she is the legal representative, is or was a Member of the Company, a
member of a committee of the Company or an officer of the Company, or while such
a Person is or was serving at the request of the Company as a director, officer,
partner, venturer, member, trustee, employee, agent or similar functionary of
another foreign or domestic general partnership, corporation, limited
partnership, joint venture, limited liability company, trust, employee benefit
plan or other enterprise, shall be indemnified by the Company to the extent such
Proceeding or other above-described process relates to any such above-described
relationships with, status with respect to, or representation of any such Person
to the fullest extent permitted by the Act, as the same exists or may hereafter
be amended (but, in the case of any such amendment, only to the extent that such
amendment permits the Company to provide broader indemnification rights than
said Laws permitted the Company to provide prior to such amendment) against
judgments, penalties (including excise and similar taxes and punitive damages),
fines, settlements and reasonable expenses (including, without limitation,
attorneys' fees) actually incurred by such Person in connection with such
Proceeding, and indemnification under this Article VIII shall continue as to a
Person who has ceased to serve in the capacity which initially entitled such
Person to indemnity hereunder for any and all liabilities and damages related to
and arising from such Person's activities while acting in such capacity;
provided, however, that no Person shall be entitled to indemnification under
this Section 8.1 in the event the Proceeding involves acts or omissions of such
Person which constitute an intentional breach of this Agreement or gross
negligence or willful misconduct on the part of such Person. The rights granted
pursuant to this Article VIII shall be deemed contract rights, and no amendment,
modification or repeal of this Article VIII shall have the effect of limiting or
denying any such rights with respect to actions taken or Proceedings arising
prior to any such amendment, modification or repeal. It is expressly
acknowledged that the indemnification provided in this Article VIII could
involve indemnification for negligence or under theories of strict liability.


                                       52
<PAGE>   58


         8.2 INDEMNIFICATION OF OFFICERS, EMPLOYEES AND AGENTS. The Company may
indemnify, and advance expenses to, Persons who are not or were not a Member,
including officers, employees or agents of the Company, and those Persons who
are or were serving at the request of the Company as a manager, director,
officer, partner, venturer, member, trustee, employee, agent or similar
functionary of another foreign or domestic general partnership, corporation,
limited partnership, joint venture, limited liability company, trust, employee
benefit plan or other enterprise against any liability asserted against such
Person and incurred by such Person in such a capacity or arising out of his
status as such a Person to the same extent that it may indemnify and advance
expenses to a Member under this Article VIII.

         8.3 ADVANCE PAYMENT. Any right to indemnification conferred in this
Article VIII shall include a limited right to be paid or reimbursed by the
Company for any and all reasonable expenses as they are incurred by a Person
entitled to be indemnified under Sections 8.1 and 8.2 who was, or is threatened,
to be made a named defendant or respondent in a Proceeding in advance of the
final disposition of the Proceeding and without any determination as to such
Person's ultimate entitlement to indemnification; provided, however, that the
payment of such expenses incurred by any such Person in advance of final
disposition of a Proceeding shall be made only upon delivery to the Company of a
written affirmation by such Person of his good faith belief that he has met the
requirements necessary for indemnification under this Article VIII and a written
undertaking, by or on behalf of such Person, to repay all amounts so advanced if
it shall ultimately be determined that such indemnified Person is not entitled
to be indemnified under this Article VIII or otherwise.

         8.4 APPEARANCE AS A WITNESS. Notwithstanding any other provision of
this Article VIII, the Company may pay or reimburse expenses incurred by any
Person entitled to be indemnified pursuant to this Article VIII in connection
with such Person's appearance as a witness or other participation in a
Proceeding at a time when he is not a named defendant or respondent in the
Proceeding.

         8.5 NONEXCLUSIVITY OF RIGHTS. The right to indemnification and the
advancement and payment of expenses conferred in this Article VIII shall not be
exclusive of any other right which a Person indemnified pursuant to Sections 8.1
and 8.2 may have or hereafter acquire under any Laws, this Agreement, or any
other agreement, vote of Members or otherwise.

         8.6 INSURANCE. The Company may purchase and maintain indemnification
insurance, at its expense, to protect itself and any Person from any expenses,
liabilities, or losses that may be indemnified under this Article VIII.

         8.7 MEMBER NOTIFICATION. Any indemnification of or advance of expenses
to any Person entitled to be indemnified under this Article VIII shall be
reported in writing to the Members with or before the notice or waiver of notice
of the next Members' meeting or with or before the next submission to Members of
a consent to action without a meeting and, in any case, within the 12 month
period immediately following the date the indemnification or advance was made.


                                       53
<PAGE>   59

         8.8 SAVINGS CLAUSE. If this Article VIII or any portion hereof shall be
invalidated on any ground by any court of competent jurisdiction, then the
Company shall nevertheless indemnify and hold harmless any Person entitled to be
indemnified pursuant to this Article VIII as to costs, charges and expenses
(including attorneys' fees), judgments, fines and amounts paid in settlement
with respect to any action, suit or proceeding, whether civil, criminal,
administrative or investigative to the full extent permitted by any applicable
portion of this Article VIII that shall not have been invalidated and to the
fullest extent permitted by applicable Laws.

         8.9 SCOPE OF INDEMNITY. For the purposes of this Article VIII,
references to the "Company" include all constituent entities, whether
corporations or otherwise, absorbed in a consolidation or merger as well as the
resulting or surviving entity. Thus, any Person entitled to be indemnified or
receive advances under this Article VIII shall stand in the same position under
the provisions of this Article VIII with respect to the resulting or surviving
entity as he would have if such merger, consolidation, or other reorganization
never occurred.

                                   ARTICLE IX.
                                      TAXES

         9.1 TAX RETURNS. The Company shall cause to be prepared and filed all
necessary federal and state income tax returns for the Company, including making
the elections described in Section 9.2. Upon written request by the Company,
each Member shall furnish to the Company all pertinent information in its
possession relating to Company operations that is necessary to enable the
Company's income tax returns to be prepared and filed.

         9.2 TAX ELECTIONS. The Company shall make the following elections on
the appropriate tax returns:

         (a) to adopt the accrual method of accounting;

         (b) an election pursuant to section 754 of the Code;

         (c) to elect to amortize the organizational expenses of the Company and
the start-up expenditures of the Company under section 195 of the Code ratably
over a period of 60 months as permitted by section 709(b) of the Code; and

         (d) any other election that the Company may deem appropriate and in the
best interests of the Company or Members, as the case may be.

                  Neither the Company nor any Member may make an election for
the Company to be excluded from the application of the provisions of subchapter
K of chapter 1 of subtitle A of the Code or any similar provisions of applicable
state law, and no provision of this Agreement shall be construed to sanction or
approve such an election.

         9.3 TAX MATTERS MEMBER. The Company shall select one of the Members as
the "Tax Matters Member" of the Company pursuant to section 6231(a)(7) of the
Code. The Tax Matters Member shall take such action as may be necessary to cause
each Member to become a


                                       54
<PAGE>   60

"notice partner" within the meaning of section 6223 of the Code and shall inform
each Member of all significant matters that may come to its attention in its
capacity as Tax Matters Member by giving notice thereof on or before the fifth
Business Day after becoming aware thereof and, within that time, shall forward
to each other Member copies of all significant written communications it may
receive in that capacity. The Tax Matters Member may not take any action
contemplated by sections 6222 through 6232 of the Code without the consent of a
Majority Interest, but this sentence does not authorize the Tax Matters Member
to take any action left to the determination of an individual Member under
sections 6222 through 6232 of the Code. The initial Tax Matters Member shall be
the Member so indicated on Exhibit A.

                                   ARTICLE X.
                   BOOKS, RECORDS, REPORTS, AND BANK ACCOUNTS

         10.1 MAINTENANCE OF BOOKS. The Company shall keep books and records of
accounts and shall keep minutes of the proceedings of its Members. The books of
account for the Company shall be maintained on an accrual basis in accordance
with the terms of this Agreement and GAAP, except that the Capital Accounts of
the Members shall be maintained in accordance with Section 4.5. The accounting
year of the Company shall be determined by the Company. The initial custodian of
the company records shall be the Tax Matters Member.

         10.2 FINANCIAL STATEMENTS. On or before the last day of each calendar
month during the existence of the Company, the Company shall cause each Member
to be furnished with an income statement for the calendar month immediately
preceding such calendar month. On or before the last day of each January, April,
July and October during the existence of the Company, the Company shall cause
each Member to be furnished with a balance sheet and a statement of cash flows
for, or as of the end of, the fiscal quarter immediately preceding such calendar
month. On or before the last day of each April during the existence of the
Company, the Company shall cause each Member to be furnished with audited
financial statements, including, a balance sheet, an income statement, a
statement of cash flows, and a statement of changes in each Member's Capital
Account for the immediately preceding calendar year. Annual financial statements
must be prepared in accordance with GAAP. The Company also may cause to be
prepared or delivered such other reports as it may deem, in its sole judgment,
appropriate. The Company shall bear the costs of all such reports and financial
statements.

         10.3 TAX STATEMENTS. On or before the last day of July during the
existence of the Company, the Company shall cause each Member to be furnished
with all information reasonably necessary or appropriate to file their
appropriate tax reports, including a schedule of Company book-tax differences
for, or as of the end of, the immediately preceding tax year. In addition, to
the extent reasonably possible, the Company will cause each Member to be
provided with estimates of all such information on or before the first day of
February each year.

         10.4 ACCOUNTS. The officers or designated Members of the Company shall
establish and maintain one or more separate bank and investment accounts and
arrangements for Company funds in the Company's name with financial institutions
and firms that officers or designated Members of the Company may determine. The
Company may not commingle the Company's funds with the funds of any other
Person. All such accounts shall be and remain the property of


                                       55
<PAGE>   61

the Company and all funds shall be received, held and disbursed for the purposes
specified in this Agreement. The officers or designated Members of the Company
may invest the Company funds only in (i) readily marketable securities issued by
the United States or any agency or instrumentality thereof and backed by the
full faith and credit of the United States maturing within three months or less
from the date of acquisition, (ii) readily marketable securities issued by any
state or municipality within the United States of America or any political
subdivision, agency or instrumentality thereof, maturing within three months or
less from the date of acquisition and rated "A" or better by any recognized
rating agency, (iii) readily marketable commercial paper rated "Prime 1" by
Moody's or "A 1" by Standard and Poor's (or comparably rated by such
organizations or any successors thereto if the rating system is changed or there
are such successors) and maturing in not more than three months after the date
of acquisition or (iv) certificates of deposit or time deposits issued by any
incorporated bank organized and doing business under the Laws of the United
States of America which is rated at least "A" or "A2" by Standard and Poor's or
Moody's, which is not in excess of federally insured amounts, and which matures
within three months or less from the date of acquisition.


                                  ARTICLE XI.
                             BANKRUPTCY OF A MEMBER

         11.1 BANKRUPT MEMBERS. If any Member becomes a Bankrupt Member, the
Company, by approval of at least a majority in interest of the Members excluding
any Bankrupt Member or, if the Company does not exercise the relevant option,
the non-Bankrupt Members which desire to participate, shall have the option,
exercisable by notice from the Company or the Members, as the case may be, to
the Bankrupt Member (or its representative) at any time prior to the 180th day
after receipt of notice of the occurrence of the event causing it to become a
Bankrupt Member, to buy, and, on the exercise of this option, the Bankrupt
Member or its representative shall sell, its Membership Interest. The purchase
price shall be an amount equal to the fair market value thereof determined by
agreement by the Bankrupt Member (or its representative) and the potential
purchaser; however, if those Persons do not agree on the fair market value on or
before the 90th day following the date of receipt by such potential purchaser of
notice of the occurrence of the event causing the Member to become a Bankrupt
Member, either such Person, by written notice to the other, may require the
determination of fair market value to be made by an independent appraiser
specified in such notice. If the Person receiving that notice objects on or
before the tenth day following receipt to the independent appraiser designated
in that notice, and those Persons otherwise fail to agree on an independent
appraiser, either such Person may petition the United States District Judge for
the Southern District of Texas then senior in active service to designate an
independent appraiser, whose determination of the independent appraiser, however
designated, is final and binding on all parties. The Bankrupt Member and the
potential purchaser each shall pay one-half of the costs of the appraisal and
court costs in appointing an appraiser (if any). If the potential purchaser then
elects, within ten days after the fair market value has been decided by
agreement or by an independent appraiser, to exercise the purchase option, the
purchasing Person shall pay the fair market value as so determined in cash on
closing. The payment to be made to the Bankrupt Member or its representative
pursuant to this Section 11.1 is in complete liquidation and satisfaction of all
the rights and interest of the Bankrupt Member and its representative (and of
all Persons claiming by, through, or under the Bankrupt Member and its
representative) in and in respect of the Company,


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<PAGE>   62

including, without limitation, any Membership Interest, any rights in specific
Company property, and any rights against the Company and its officers, agents,
and representatives and (insofar as the affairs of the Company are concerned)
against the Members.

                                  ARTICLE XII.
                    DISSOLUTION, LIQUIDATION, AND TERMINATION

         12.1 DISSOLUTION. Subject to the provisions of Section 12.2 and any
applicable Laws, the Company shall dissolve and its affairs shall be wound up on
the first to occur of the following:

         (a) the consent of all of the Membership Interests or as expressly
provided in Section 3.17 and Section 3.18;

         (b) the expiration of the period fixed for the duration of the Company
as set forth in this Agreement;

         (c) entry of a decree of judicial dissolution of the Company under
section 18-802 of the Act in accordance with Section 16.8; and

         (d) the bankruptcy or dissolution of a Member or other event described
in section 18-801 of the Act (other than a Transfer of Membership Interest in
accordance with the terms of this Agreement).

         12.2 LIQUIDATION AND TERMINATION. Subject to Section 7.5 and Section
12.2(d), and except as expressly provided for to the contrary in Section 3.17
and Section 3.18, upon dissolution of the Company, a representative of the
Company selected by a Majority Interest (not including any Member in Default at
the time of dissolution) shall act as a liquidator or may appoint one or more
Members as liquidator ("Liquidator"). The Liquidator shall proceed diligently to
wind up the affairs of the Company and make final distributions as provided
herein and in the Act. The costs of liquidation shall be borne as a Company
expense. Until final distribution, the Liquidator shall continue to operate the
Company properties for a reasonable period of time to allow for the sale of all
or a part of the assets thereof with all of the power and authority of the
Members. The steps to be accomplished by the Liquidator are as follows:

         (a) as promptly as possible after dissolution and again after final
liquidation, the Liquidator shall cause a proper accounting to be made of the
Company's assets, liabilities, and operations through the last day of the
calendar month in which the dissolution occurs or the final liquidation is
completed, as applicable;

         (b) the Liquidator shall cause any notices required by law to be mailed
to each known creditor of and claimant against the Company in the manner
described by such law;

         (c) subject to the terms and conditions of this Agreement and the Act
(especially section 18-803), the Liquidator shall distribute the assets of the
Company in the following order:


                                       57
<PAGE>   63

                  (i) the Liquidator shall pay, satisfy or discharge from
         Company funds all of the debts, liabilities and obligations of the
         Company, including, without limitation, all expenses incurred in
         liquidation or otherwise make adequate provision for payment and
         discharge thereof (including, without limitation, the establishment of
         a cash escrow fund for contingent liabilities in such amount and for
         such term as the Liquidator may reasonably determine); provided,
         however, such payments shall not include any Capital Contributions
         described in Article IV or any other obligations in favor of the
         Members created by this Agreement other than a loan made pursuant to
         any provision other than Section 15.2; and

                  (ii) all remaining assets of the Company shall be distributed
         to the Members as follows:

                           (A) the Liquidator may sell any or all Company
                  property, including to one or more of the Members (other than
                  any Member in Default at the time of dissolution), provided
                  (x) any such sale to a Member is made on an arms length basis
                  under terms which are in the best interest of the Company and
                  (y) to the extent that any Member has participated in an
                  Expansion Option under Section 15.2(b), the Liquidator shall
                  hire an independent consultant to attribute (on the basis of
                  the then existing fair market value) the proceeds from the
                  sale of the Company property between each respective Major
                  Expansion Project, and all other assets of the Company (such
                  value for each respective Major Expansion Project the
                  "Expansion Liquidation Value") and the Liquidator shall repay
                  any Members' Expansion Option loan pursuant to Section
                  15.2(e), but only to the extent that there is any Expansion
                  Liquidation Value allocated to the corresponding Major
                  Expansion Project;

                           (B) with respect to all Company property that has not
                  been sold, the fair market value of that property (as
                  determined by the Liquidator using any method of valuation as
                  it, using its best judgment, deems reasonable) shall be
                  determined and the Capital Accounts of the Members shall be
                  adjusted to reflect the manner in which the unrealized income,
                  gain, loss, and deduction inherent in property that has not
                  been reflected in the Capital Accounts previously would be
                  allocated among the Members if there were a taxable
                  disposition of that property for the fair market value of that
                  property on the date of distribution; and

                           (C) Company property shall be distributed among the
                  Members ratably in proportion to each Member's Capital Account
                  balances, as determined after taking into account all Capital
                  Account adjustments for the taxable year of the Company during
                  which the liquidation of the Company occurs (other than those
                  made by reason of this clause (C)).

                  All distributions in kind to the Members shall be made subject
to the liability of each distributee for costs, expenses, and liabilities
theretofore incurred or for which the Company has committed prior to the date of
termination and those costs, expenses, and liabilities shall be allocated to the
distributee pursuant to this Section 12.2. The distribution of cash and/or
property

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<PAGE>   64

to a Member in accordance with the provisions of this Section 12.2 constitutes a
complete return to the Member of its Capital Contributions and a complete
distribution to the Member of its Membership Interest and all the Company's
property.

         (d) Upon dissolution of the Company upon an event occurring to a Member
(the "Withdrawing Member") described in Section 12.1(d), then within 30 days
after the Company delivers notice of such event to the Members, at least 50% of
such other Members (by Membership Interest and excluding the Membership Interest
of the Withdrawing Member) may elect to reconstitute the Company and continue
its business on the same terms and conditions set forth in this Agreement by
forming a new company on terms identical to those set forth in this Agreement
and, as necessary, admitting an additional Member chosen by such other Members.
Such non-Withdrawing Members shall be deemed to have voted for and consented to
such reconstitution unless a written statement objecting to the reconstitution
shall have been received by the Company within 30 days after notice of
dissolution was made to such Member. Upon any such election to reconstitute by
at least 50% of such other Members (by Membership Interest), all Members and
their successors shall be bound thereby and shall be deemed to have approved
thereof. Unless such an election to reconstitute is made within the applicable
time period as set forth above, the Company shall conduct only activities
necessary to wind up its affairs. If such an election is so made, then:

                  (i) the reconstituted Company shall continue until the end of
         the term set forth in Section 2.6 unless earlier dissolved in
         accordance with this Article XII; and

                  (ii) the interest of the Withdrawing Member shall be treated
         thenceforth as the interest of a Transferee that has not been admitted
         as a Substitute Member hereunder.

         12.3 PROVISION FOR CONTINGENT CLAIMS.

         (a) The Liquidator shall make a reasonable provision to pay all claims
and obligations, including all contingent, conditional or unmatured claims and
obligations, actually known to the Company but for which the identity of the
claimant is unknown; and

         (b) If there are insufficient assets to both pay the creditors pursuant
to Section 12.2(c)(i) and to establish the provision contemplated by Section
12.3(a), the claims shall be paid as provided for in accordance to their
priority, and, among claims of equal priority, ratably to the extent of assets
therefor.

         12.4 DEFICIT CAPITAL ACCOUNTS. Notwithstanding anything to the contrary
contained in this Agreement, and notwithstanding any custom or rule of law to
the contrary, to the extent that the deficit, if any, in the Capital Account of
any Member results from or is attributable to deductions and losses of the
Company (including non-cash items such as depreciation), or distributions of
money pursuant to this Agreement to all Members ratably in proportion to their
respective Membership Interests, upon dissolution of the Company such deficit
shall not be an asset of the Company and such Members shall not be obligated to
contribute any amounts to the Company to bring the balance of such Member's
capital account to zero.

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<PAGE>   65


                                 ARTICLE XIII.
                           AMENDMENT OF THE AGREEMENT

         13.1 AMENDMENTS TO BE ADOPTED BY THE COMPANY. Each Member agrees that
the appropriate officer of the Company, in accordance with and subject to the
limitations contained in Article VII, may execute, swear to, acknowledge,
deliver, file and record whatever documents may be required to reflect:

         (a) a change in the name of the Company, the location of the principal
place of business of the Company or the registered agent or office of the
Company;

         (b) admission or substitution of Members effected in accordance with
this Agreement;

         (c) a change that the Members believe is reasonable and necessary or
appropriate to qualify or continue the qualification of the Company as a limited
liability company under the Laws of any state or that is necessary or advisable
in the opinion of the Company to ensure that the Company will not be taxable as
a corporation or otherwise taxed as an entity for federal income tax purposes;

         (d) a change that is necessary or appropriate for the Company to
satisfy any requirements, conditions, guidelines or interpretations contained in
any opinion, interpretative release, directive, order, ruling or regulation of
any federal or state agency or judicial authority (including, without
limitation, the Act);

         (e) an amendment that is necessary, in the opinion of counsel, to
prevent the Company or its officers from in any manner being subjected to the
provisions of the Investment Company Act of 1940, as amended, or "plan asset"
regulations adopted under the Employee Retirement Income Security Act of 1974,
as amended, whether or not substantially similar to plan asset regulations
currently applied or proposed by the United States Department of Labor; and

         (f) subject to the terms of Section 3.10, an amendment that the Company
determines in its sole discretion to be necessary or appropriate in connection
with the authorization for issuance of any Membership Interest pursuant to
Section 3.10.

         13.2 AMENDMENT PROCEDURES. Except as provided in Section 13.1, all
amendments to this Agreement shall be made in accordance with the following
requirements. Amendments to this Agreement may be proposed by any Member. Each
such proposal shall contain the text of the proposed amendment. If an amendment
is proposed, the Company shall seek the written approval of the holders of the
requisite percentage of Membership Interests or call a meeting of the Members to
consider and vote on such proposed amendment. A proposed amendment shall be
effective upon its approval by the holders of all of the Membership Interests,
unless a different percentage is expressly required under this Agreement. Any
amendment that would materially and adversely affect the rights of any type or
class of Membership Interests in relation to other types or classes of
Membership Interests requires the approval of the holders of at least a


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<PAGE>   66

majority of the Membership Interests of such class or type of Membership
Interest. The Company shall notify all Record Holders upon final adoption of any
proposed amendment.


                                  ARTICLE XIV.
                        CERTIFICATED MEMBERSHIP INTERESTS

         14.1 ENTITLEMENT TO CERTIFICATES. Every owner of a Membership Interest
in the Company, unless and to the extent the Company elects otherwise, shall be
entitled to have a certificate, in such form as is approved by the Company and
conforms with applicable law, certifying the Membership Interest owned by it.

         14.2 MULTIPLE CLASSES OF INTEREST. If the Company shall be authorized
to issue more than one class of Membership Interest or more than one series of
any Membership Interest, a statement of the powers, designations, preferences
and relative, participating, optional or other special rights of each class of
membership interest or series thereof and the qualification, limitations or
restrictions of such preferences and/or rights shall, unless the Members shall
by resolution provide that such class or series of Membership Interest shall be
uncertificated, be set forth in full or summarized on the face or back of the
certificate which the Company shall issue to represent such class or series of
Membership Interest; provided that, to the extent allowed by law, in lieu of
such statement, the face or back of such certificate may state that the Company
will furnish a copy of such statement without charge to each requesting Member.

         14.3 SIGNATURES. Each certificate representing a Membership Interest in
the Company shall be signed by or in the name of the Company by (1) the
President or any Vice President of the Company and (2) the Treasurer, any
Assistant Treasurer, the Secretary or any Assistant Secretary of the Company.
The signature of the officers of the Company may be facsimiles. In case any
officer who has signed or whose facsimile signature has been placed upon a
certificate shall have ceased to hold such office before such certificate is
issued, it may be issued by the Company with the same effect as if he held such
office on the date of issue.

         14.4 ISSUANCE AND PAYMENT. Subject to the provisions of the Act and
this Agreement, including, without limitation, Section 3.10, Membership
Interests may be issued for such consideration and to such persons as the
Company may determine from time to time.

         14.5 RESTRICTIVE LEGEND. In the absence of a more restrictive legend,
all certificates which evidence Membership Interests shall be stamped or typed
in a conspicuous place with the following legend:

         THE INTEREST REPRESENTED BY THIS CERTIFICATE IS SUBJECT TO THE LIMITED
         LIABILITY AGREEMENT OF THE COMPANY DATED AS OF JANUARY 17, 1997, AS IT
         EXISTS FROM TIME TO TIME, WHICH RESTRICTS ANY SALE, ASSIGNMENT,
         TRANSFER, CONVEYANCE, ENCUMBRANCE, PLEDGE OR OTHER TRANSFER OR
         ALIENATION (WITH OR WITHOUT CONSIDERATION) OF SUCH INTEREST. THE
         COMPANY WILL FURNISH TO THE RECORD HOLDER OF THIS CERTIFICATE, WITHOUT
         CHARGE, UPON WRITTEN REQUEST TO THE


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<PAGE>   67

         COMPANY AT ITS PRINCIPAL PLACE OF BUSINESS, A COPY OF SUCH LIMITED
         LIABILITY AGREEMENT. THE SECURITIES REPRESENTED BY THIS CERTIFICATE
         HAVE BEEN ACQUIRED FOR INVESTMENT AND HAVE NOT BEEN REGISTERED UNDER
         THE SECURITIES ACT OF 1933, AS AMENDED, OR THE SECURITIES LAWS OF ANY
         STATE. WITHOUT SUCH REGISTRATION, SUCH SECURITIES MAY NOT BE SOLD,
         ASSIGNED, TRANSFERRED, CONVEYED, PLEDGED, HYPOTHECATED, OR OTHERWISE
         TRANSFERRED, EXCEPT UPON DELIVERY TO THE COMPANY OF AN OPINION OF
         COUNSEL SATISFACTORY TO THE COMPANY THAT SUCH REGISTRATION IS NOT
         REQUIRED FOR SUCH TRANSFER.

Such legend shall also be placed on all Certificates which are hereafter issued
to any Member.

         14.6 LOST, STOLEN OR DESTROYED CERTIFICATES. The Company may direct a
new certificate or certificates to be issued in place of any certificate or
certificates theretofore issued by the Company alleged to have been lost, stolen
or destroyed upon the making of an affidavit of that fact by the Person claiming
the certificate of stock to be lost, stolen or destroyed. When authorizing such
issue of a new certificate or certificates, the Company may, in its discretion
and as a condition precedent to the issuance thereof, require the owner of such
lost, stolen or destroyed certificate or certificates, or his legal
representative, to advertise the same in such manner as it shall require and/or
to give the Company a bond in such sum as it may direct as indemnity against any
claim that may be made against the Company with respect to the certificate
alleged to have been lost, stolen or destroyed.

         14.7 TRANSFER OF MEMBERSHIP INTEREST. Upon surrender to the Company or
its transfer agent, if any, of a certificate representing Membership Interests
duly endorsed or accompanied by proper evidence of succession, assignation or
authority to Transfer in accordance with this Agreement and of the payment of
all taxes applicable to the Transfer of said Membership Interest, the Company
shall be obligated to issue a new certificate to the Person entitled thereto,
cancel the old certificate and record the transaction upon its books, provided,
however, that the Company shall not be so obligated unless such Transfer was
made in compliance with the provisions of this Agreement and any applicable
state and federal Laws.

         14.8 REGISTERED HOLDERS. The Company shall be entitled to recognize the
exclusive right of a Person registered on its books as the owner of the
indicated Membership Interest and shall not be bound to recognize any equitable
or other claim to or interest in such Membership Interest on the part of any
Person other than such registered owner, whether or not it shall have express or
other notice thereof, except as otherwise provided by Law.


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<PAGE>   68

                                  ARTICLE XV.
                     OTHER MEMBER AGREEMENTS AND OBLIGATIONS

         15.1 LATERAL OPPORTUNITIES.

         (a) Limitation on Lateral Opportunities. Except as otherwise provided
in this Section 15.1(a) no constituent of the Shell Gas Pipeline Companies,
Marathon Gas Pipeline Companies or Leviathan Gas Pipeline Companies, will,
directly or indirectly, enter into any agreement to construct or otherwise
consummate transactions involving construction of any Lateral in which such
constituent would own an interest (a "Lateral Opportunity") until such Lateral
Opportunity has been rejected or otherwise forfeited by Manta Ray or Nautilus,
as applicable. Any constituent of the Shell Gas Pipeline Companies, Marathon Gas
Pipeline Companies, or Leviathan Gas Pipeline Companies may enter into an
agreement, which may be amended from time to time, with their respective
Affiliates involving a Lateral Opportunity and, if applicable, the terms and
conditions of such agreement or agreements will be offered to Nautilus or Manta
Ray as applicable pursuant to the terms and conditions of Section 15.1(b).
Notwithstanding the foregoing, any constituent of the Shell Gas Pipeline
Companies, Marathon Gas Pipeline Companies or Leviathan Gas Pipeline Companies
may, without complying with the provisions of this Section 15.1, construct a
Lateral (i) designed solely for the purpose of gathering or transporting natural
gas produced from a commercial property in which such constructing constituent
of the Shell Gas Pipeline Companies, Marathon Gas Pipeline Companies or
Leviathan Gas Pipeline Companies, as the case may be, or any Affiliate thereof,
owns an interest; provided that (x) such interest in the natural gas to be
gathered or transported by such Lateral was acquired by the relevant Person
primarily for a purpose other than the avoidance of the provisions of this
Section and (y) such exception shall not apply to any Lateral sized in such a
manner that it would accommodate production from (a) any lease or commercial
property in which Shell Holding, Marathon Holding or Leviathan Holding, or their
Affiliate does not have an interest or (b) any lease owned by Shell Holding,
Marathon Holding, or Leviathan Holding, or their Affiliate, which is not a
commercial property; or (ii) in which any constituent of the Shell Gas Pipeline
Companies, Marathon Gas Pipeline Companies, or Leviathan Gas Pipeline Companies
would own an interest of less than 100% of the Lateral or of less than 100% of
the entity owning the Lateral because an Affiliate does not own one hundred
percent (100%) of the production.

         (b) Delivery of Lateral Opportunity Notice. Any Member may propose that
Manta Ray or Nautilus, as applicable, undertake a Lateral Opportunity by
delivering written notice (a "Lateral Opportunity Notice") to Manta Ray or
Nautilus, as applicable, and each of the Members. (A) A Lateral Opportunity
Notice involving the connection solely of third party production shall include
the proposed terms and conditions of such transactions, which terms shall, at
minimum, (x) reflect an arms length transaction on reasonably fair terms,
independent of any other transaction, and (y) be no less favorable to Nautilus
or Manta Ray as applicable than the Lateral Opportunity offered to such Member.
The Lateral Opportunity Notice shall also contain reasonably sufficient
operational and financial information and other details to allow the Members to
make a reasonably informed decision with respect to such Lateral Opportunity.
Such Lateral Opportunity Notice shall (i) state whether such Lateral Opportunity
is, directly or indirectly, related in any way to any past, current or
contemplated transaction involving the Member delivering such notice (including
its


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<PAGE>   69

Affiliates), (ii) contain a statement, if true, that the Member is not aware of
any undisclosed benefits expected to accrue to the Member or its Affiliates as a
result of such Lateral Opportunity or, if the delivering Member is unable to
make such statement, the notice shall disclose the existence, but not the
details of such other benefits, and (iii) contain only financial projections
prepared in good faith based upon assumptions relating to such Lateral
Opportunity believed by the Member to be reasonable. (B) A Lateral Opportunity
Notice involving the connection of any production of a Member or its Affiliates
that must be offered to Nautilus or Manta Ray, as applicable, under the terms of
Section 15.1(a) shall include the proposed terms and conditions of such
transactions, which terms shall be no less favorable to the Company than the
Lateral Opportunity offered to such Member. The Lateral Opportunity Notice shall
also contain reasonably sufficient operational and financial information and
other details to allow the Members to make a reasonably informed decision with
respect to such Lateral Opportunity.

         (c) Rejected Lateral Opportunities. If Nautilus or Manta Ray, as
applicable, do not vote to accept the Lateral Opportunity and deliver notice
accordingly in writing within 30 days after Manta Ray or Nautilus, as
applicable, receives the Lateral Opportunity Notice that Manta Ray or Nautilus,
as applicable, should undertake such project on the terms and conditions set
forth in the applicable Lateral Opportunity Notice, then the Member (and/or its
Affiliates) who provided and voted in favor of the Lateral Opportunity Notice
shall have the right to pursue such project (a "Rejected Lateral Opportunity")
on the terms and conditions set forth in the applicable Lateral Opportunity
Notice and own any assets related thereto. In such event, the Member who
provided the Lateral Opportunity Notice (and/or its Affiliates) shall be free
for a period of 120 days to enter into definitive agreements, if any, or
otherwise consummate the transactions contemplated by the applicable Lateral
Opportunity Notice on the same terms and conditions set forth in the applicable
Lateral Opportunity Notice without further obligation to any Members or Manta
Ray or Nautilus, as applicable; provided that following such 120 day period such
Member or its Affiliates may not enter into definitive agreements, if any, or
otherwise consummate the transactions with respect to a Rejected Lateral
Opportunity without again offering the same to Manta Ray or Nautilus, as
applicable, in accordance with this Article. No Member shall have any obligation
or duty to Manta Ray or Nautilus, as applicable, or the other Members with
respect to any Rejected Lateral Opportunity to the extent it is covered by
definitive agreements entered into, or otherwise consummated, by such Member or
its Affiliates after compliance with this Section 15.1 or with respect to any
modification, renewal or extension of the terms of such definitive agreements
with respect to any such Rejected Lateral Opportunity. Except as set forth in
this Section, the construction, acquisition, operation, maintenance and
ownership of each such Rejected Lateral Opportunity project shall not be
governed or affected by this Agreement.

         15.2 EXPANSIONS.

         (a) Expansion Option. Any Member (the "Exercising Member") shall have
the right to require the Company to cause Manta Ray or Nautilus, as applicable,
to construct, own and operate a particular Major Expansion Project (the
"Expansion Option") if (i) the Exercising Member or an Affiliate of the
Exercising Member has delivered written notice (the


                                       64
<PAGE>   70

"Capacity Request") to Manta Ray or Nautilus, as applicable, requesting,
pursuant to a Dedication Agreement, firm capacity on the Manta Ray System or the
Nautilus System, whichever is applicable, to gather or transport gas (including
gas which is not owned by the Exercising Member or its Affiliate) from one or
more leases dedicated pursuant to the relevant Dedication Agreement (the
"Expansion Property") to the extent the expected volume (including increases in
volume from existing properties of which some or all of the volumes could be
Accelerated Volumes) of the production from which (the "Expansion Property
Production") at the time of such notice is not being delivered into the Manta
Ray System or the Nautilus System, whichever is applicable, (ii) the Accessible
Capacity is not sufficient to practically handle substantially all of the
Expansion Property Production, (iii) the relevant Major Expansion Project is
necessary to increase the Base Capacity to a level adequate to allow Manta Ray
or Nautilus, as applicable, to handle the Expansion Property Production, (iv)
within 60 days from the latest date on which Manta Ray or Nautilus, as
applicable, has the right to respond to the Capacity Request (the "Expansion
Option Period"), each of the Company and Manta Ray or Nautilus, as applicable,
have held a meeting and voted against the relevant Major Expansion Project, (v)
the Exercising Member voted in favor of the relevant Major Expansion Project at
such meeting and (vi) the Expansion Option is exercised in accordance with the
requirements of Section 15.2(b) below.

         (b) Exercise. The Exercising Member shall exercise the Expansion Option
by delivering, at any time after such Major Expansion Project has been rejected
by each of the Company Manta Ray or Nautilus, as applicable, but before the end
of the Expansion Option Period, written notice of such exercise (the "Expansion
Option Notice") to the Company and each Member. Such notice shall include an
irrevocable commitment to timely fund the relevant Major Expansion Project and,
if appropriate, assurances reasonably satisfactory to the Company that such
Member has the ability to fund such Major Expansion Project; provided, however,
that no such additional assurances will be required of Shell Holding, Marathon
Holding or Leviathan Holding as long as their respective funding obligations are
subject to a relevant parent-company guaranty that provides the same practical
benefits to the Company as the guaranty entered into as of the date hereof.
Whenever an Exercising Member delivers an Expansion Option Notice, every other
Member which voted in favor of the relevant Major Expansion Project at the last
meeting during which such project was voted on (together with the Exercising
Member, the "Expansion Participants") shall have the right to participate,
proportionately (based on the relationship of its Membership Interest to the
Membership Interests of all of the Expansion Participants), in such project on
the same basis as the Exercising Member, including the right to receive the
Payout Amount out of 80% of the Expanded Capacity Revenues and the obligation to
fund such project. Any Member which desires to exercise its right to participate
in such project must deliver a notice substantially similar to that delivered by
the original Exercising Member in accordance with the terms of this subsection,
within 30 days after it receives the Expansion Option Notice. If any Expansion
Participant pays any amount to the Company in excess of the amount needed to
fund the Expansion Project, the Company shall immediately return such excess
amount to the Expansion Participant.

         (c) Repayment. Until the Expansion Participants have (i) received
payment with respect to 80% of the Expanded Capacity Revenues in an amount equal
to the Payout Amount


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<PAGE>   71

or (ii) the Company, by a unanimous vote of all Members other than the Expansion
Participants, has otherwise paid the unamortized portion of the Payout Amount to
the Expansion Participants as described below, the Expansion Participants shall
be paid monthly amounts equal to 80% of the Expanded Capacity Revenues. Such
amounts shall be allocated among the Expansion Participants in proportion to the
Membership Interests of each such Expansion Participant to the Membership
Interests of all such Expansion Participants. The remaining 20% of the Expanded
Capacity Revenues shall be retained by the Company and allocated to all of the
Members based on their respective Membership Interests. After recovery of the
Payout Amount or payment by the Company of the unamortized portion of the Payout
Amount to the Expansion Participants as described below, all of the Expansion
Capacity Revenues shall be retained by the Company and allocated to all of the
Members based on their respective Membership Interests. If, at any time the
Company, by a unanimous vote of all Members other than the Expansion
Participants, elects to pay off the unamortized amount of the Payout Amount, the
Company shall promptly pay an amount equal to the then-remaining unpaid
principal amount of the Payout Amount to the Expansion Participants, which
remaining unpaid principal amount shall be calculated by treating as principal
payments 10/15 of all amounts received by the Expansion Participants prior to
such time in satisfaction of the Payout Amount.

         (d) Capacity. Prior to proceeding with any Major Expansion Project in
accordance with this Section, all of the Members shall cooperate to establish
(i) the Accessible Capacity, using the lesser of (x) the maximum approved
operating pressure, (y) the then existing contractual operating pressure or (z)
the maximum physical pressure at which the line can operate, in each case
determined at the inlet of each relevant point of receipt and the pressure
(averaged over the last three months) at the relevant points of delivery and
(ii) an expansion design to handle the Expansion Property Production. If the
Members cannot agree on any such matter, the Company shall engage an independent
consultant (of national prominence with experience in the relevant geographical
area) to resolve each such matter.

         (e) Treatment as Loan. Any amount paid by one or more Members pursuant
to Section 15.2(b) shall be considered to be a limited recourse, partially
secured loan from the advancing Members to the Company, with such loan payable
only from, and secured only by a security interest granted by the Company in,
80% of the Expanded Capacity Revenues until such loan is paid in full. Except
for such security interest in 80% of the Expanded Capacity Revenues, such loan
shall be without recourse against the Company. The Company shall have no
obligation to repay such loan other than to the extent that 80% of the Expanded
Capacity Revenues are available.

         15.3 CERTAIN PROPERTIES. Notwithstanding anything contained in this
Agreement to the contrary, Leviathan Holding and any of its Affiliates shall
have the right, at their sole cost, expense and risk, to construct pipeline
laterals or extensions or related facilities to connect the Manta Ray System to
gas produced from Blocks 871, 914, 915, 916, 958, 959, 1002 and 1003 in the
Ewing Bank Area, Gulf of Mexico pursuant to any agreement existing on the
Formation Date. Such right shall be absolute and unconditional and shall be free
and clear of any obligation to offer the Company or any Member the right to
participate therein.


                                       66
<PAGE>   72

                                  ARTICLE XVI.
                               GENERAL PROVISIONS

         16.1. OFFSET. Whenever the Company is to pay any sum to any Member, any
amounts that a Member owes the Company may be deducted from that sum before
payment.

         16.2. ENTIRE AGREEMENT; SUPERSEDURE. This Agreement constitutes the
entire agreement and supersedes (i) all prior oral or written proposals or
agreements (ii) all contemporaneous oral proposals or agreements and (iii) all
previous negotiations and all other communications or understandings between the
Parties with respect to the subject matter hereof, including, without
limitation, that certain Letter of Intent dated June 24, 1996 between Leviathan
Gas Pipeline Partners, L.P., Shell Offshore Inc., and Marathon Oil Company,
among others, and the related Letter of Intent dated September 10, 1996, but
excluding any confidentiality agreement between or among any Members or their
Affiliates and the letter agreement referred in Section 3.17(a)(iii).

         16.3. WAIVERS. Neither action taken (including, without limitation, any
investigation by or on behalf of any Party) nor inaction pursuant to this
Agreement, shall be deemed to constitute a waiver of compliance with any
representation, warranty, covenant or agreement contained herein by the Party
not committing such action or inaction. A waiver by any Party of a particular
right, including, without limitation, breach of any provision of this Agreement,
shall not operate or be construed as a subsequent waiver of that same right or a
waiver of any other right.

         16.4. BINDING EFFECT. This Agreement shall be binding upon and inure to
the benefit of the Members and their respective heirs, legal representatives,
successors and assigns.

         16.5. MEMBER DEADLOCKS; NEGOTIATIONS AND MEDIATION.

         (a) Member Deadlocks. Except for any matter or proposal covered by the
immediately succeeding sentence, Member approval or disapproval of any matter
shall not be subject to the provisions of this Section 16.5. If any matter or
proposal covered by Sections 6.3(b)(i)-(iv) or relating to an operating budget
described in Section 6.3(b)(v), requiring the vote of less than all of the
Membership Interest for approval thereof is brought before the Members and
receives neither (x) at least the Required Interest voting for such matter or
proposal nor (y) at least the Required Interest voting against (not including
abstentions or other non-votes) such matter or proposal, then any Member, by
written notice to the other Members given within three Business Days after the
initial vote on such matter or proposal, may call a meeting of the Members to
reconsider such matter or proposal, such meeting to be held when, where and as
reasonably specified in said notice, but not less than three Business Days nor
more than seven Business Days after the date of such vote. If such meeting is
called and held as herein provided and the matter or proposal is offered at such
meeting again and (x) does not receive at least the Required Interest voting for
such matter or proposal or (y) does not receive at least the Required Interest
voting against (not including abstentions or other non-votes) such matter or
proposal, then any Member may within three Business Days thereafter submit the
matter to further negotiation, and, if applicable, non-binding mediation, in
accordance with this Section. If no Member calls such a meeting within the first
three Business Day period herein provided for or if


                                       67
<PAGE>   73

further negotiation is not requested within the three Business Day period after
the second meeting, no Member shall thereafter have any right to request further
negotiation or non-binding mediation regarding such matter or proposal.

         (b) Further Negotiation. Any Member wishing to submit a matter or
proposal to further negotiation as permitted above or pursuant to Section 16.8
shall do so by giving written notice of further negotiation to the other Members
containing a brief description of the nature of the dispute to be further
negotiated and the position of the Member initiating further negotiation. Upon
receipt of such notice, each Member shall appoint a representative for such
further negotiations, which representative shall hold a position with the Person
owning such Member of equal or superior status to the prior representative of
such Member with respect to the proposal in question. The respective
representatives shall meet at the principal office of the Company at 10:00 a.m.
local time on the third Business Day after the date of receiving the notice of
further negotiations.

         (c) Non-Binding Mediation. If within ten Business Days following
initial receipt by the Members of the notice of further negotiations neither (x)
at least the Required Interest votes for such matter or proposal nor (y) at
least the Required Interest votes against (not including abstentions or other
non-votes) such matter or proposal, then any Member may subject the matter or
proposal to non-binding mediation by giving written notice of mediation to the
other Members within five Business Days thereafter. The notice of mediation
shall state the identity of the single mediator selected by the Member
initiating mediation and contain a detailed statement of the nature of the
dispute to be mediated and the remedy or resolution sought by the Member
initiating mediation. Neither the Members nor the mediator will have the right
to conduct any further discovery relating to such mediation. The Member or
Members initiating mediation shall pay the fees of the mediator; provided,
however, that if the vote of the Members changes as a result of such mediation,
then the Company shall pay all such fees and each of the Members' costs related
to such mediation. Unless otherwise agreed by all of the Members, the mediation
proceedings shall be held in Houston, Texas at such location selected by the
mediator and shall begin as soon as practicable, but not less than five Business
Days following the mailing of the initiating Member's notice of mediation. If
within five Business Days following initiation of mediation proceedings neither
(x) at least the Required Interest votes for such matter or proposal nor (y) at
least the Required Interest votes against (not including abstentions or other
non-votes) such matter or proposal, then such mediation shall terminate and such
matter or proposal will no longer be subject to further negotiation or
mediation. Except with respect to the matters expressly specified in Section
16.5(a) and Section 16.8, no Member shall have the right to demand mediation
with respect to any dispute, difference or question arising between any of the
Members themselves or any Member and the Company.

         16.6. GOVERNING LAW; SEVERABILITY.

         (a) THIS AGREEMENT HAS BEEN EXECUTED AND DELIVERED AND SHALL BE
CONSTRUED, INTERPRETED AND GOVERNED PURSUANT TO AND IN ACCORDANCE WITH THE LAWS
OF THE STATE OF DELAWARE, WITHOUT REGARD TO ANY CONFLICT OF LAWS PRINCIPLES
WHICH, IF APPLIED, MIGHT PERMIT OR REQUIRE THE APPLICATION OF THE LAWS OF
ANOTHER JURISDICTION.


                                       68
<PAGE>   74


         (b) In the event of a direct conflict between the provisions of this
Agreement and any mandatory provision of the Act or applicable Laws, the
applicable provision of the Act or other applicable Laws, as the case may be,
shall control. If any provision of this Agreement, or the application thereof to
any Person or circumstance, is held invalid or unenforceable to any extent, the
remainder of this Agreement and the application of that provision to other
Persons or circumstances shall not be affected thereby and that provision shall
be enforced to the greatest extent permitted by the Act or other applicable
Laws, as the case may be.

         16.7. FURTHER ASSURANCES. Subject to the terms and conditions set forth
in this Agreement, each of the Parties agrees to use all reasonable efforts to
take, or to cause to be taken, all actions, and to do, or to cause to be done,
all things necessary, proper or advisable under applicable Laws and regulations
to consummate and make effective the transactions contemplated by this
Agreement. In case, at any time after the execution of this Agreement, any
further action is necessary or desirable to carry out its purposes, the proper
officers or directors of the Parties shall take or cause to be taken all such
necessary action.

         16.8. EXERCISE OF CERTAIN RIGHTS. No Member may maintain any action for
partition of the property of the Company. No Member may maintain any action for
dissolution and liquidation of the Company unless such Member has submitted the
dispute giving rise to such possible action to further negotiation and
non-binding mediation, which further negotiation and mediation shall be
conducted in accordance with the time periods and procedures set forth in
Section 16.5(b) and (c), to the extent applicable. If such dispute is still
unresolved after the conclusion of such further negotiation and non-binding
mediation, such Member shall offer to sell its Membership Interest (free and
clear of all liens and encumbrances) to the other Members for an amount of cash
equal to the fair market value of the selling Member's Membership Interest,
determined by multiplying such selling Member's Membership Interest by the fair
market value of the Company, as a whole, without regard to any discounts or
premiums related to minority interest, controlling interest, liquidity or
related matters. If such Members do not agree on the fair market value thereof,
such value shall be determined by an arbitrator in accordance with the
arbitration procedures set forth in Section 3.6(e). If the non-selling Members
do not exercise the option to purchase such Membership Interest within 60 days
after the fair market value is determined, then the selling Member shall have
the right for a period of 30 days after such 60-day period to initiate an action
for such dissolution and liquidation pursuant to section 18-802 of the Act or
any similar applicable statutory or common law dissolution right. If no Member
has brought such action for dissolution within such 30 day period, then any
Member may maintain an action for dissolution and liquidation only after again
following the procedures set forth in this Section. Upon the institution of, and
during the pendency of, any such dissolution proceeding, the Members agree to
use commercially reasonable efforts to employ procedures and experts to ensure
that such dissolution process will result in the Company and/or its assets being
disposed of at fair market value; provided that such cooperative efforts shall
not constitute a waiver or limitation of any such Member's right to contest such
dissolution. Such procedures shall include soliciting likely potential
purchasers, establishing a data room and other information sharing procedures
and, if appropriate, engaging an investment banker, consultant or


                                       69
<PAGE>   75

other expert to facilitate and enhance the marketing efforts. The terms and
conditions of this Section 16.8 are intended to preserve any right to
dissolution created by statute or common law (such as by section 18-802 of the
Act), but do not create any contractual right to dissolution.

         16.9. NOTICE TO MEMBERS OF PROVISIONS OF THIS AGREEMENT. By executing
this Agreement, each Member acknowledges that it has actual notice of all of the
provisions of this Agreement. Each Member hereby agrees that this Agreement
constitutes adequate notice of all such provisions.

         16.10. COUNTERPARTS. This Agreement may be executed in multiple
counterparts, each of which, when executed, shall be deemed an original, and all
of which shall constitute but one and the same instrument.

         16.11. ATTENDANCE VIA COMMUNICATIONS EQUIPMENT. Unless otherwise
restricted by law or this Agreement, the Members or committees may hold meetings
by means of telephone conference or other communications equipment by means of
which all Persons participating in the meeting can effectively communicate with
each other. Such participation in a meeting shall constitute presence in person
at the meeting, except where a Person participates in the meeting for the
express purpose of objecting to the transaction of any business on the ground
that the meeting is not lawfully called or convened.

         16.12. REPORTS TO MEMBERS. The officers of the Company shall present at
each annual meeting of Members, and at any special meeting of Members, a
statement of the business and condition of the Company.

         16.13. CHECKS, NOTES AND CONTRACTS. Checks and other orders for the
payment of money shall be signed by such Person or Persons as the Company shall
from time to time by resolution determine. Contracts and other instruments or
documents may be signed in the name of the Company by any Person or Persons as
the Company shall from time to time by resolution determine authorized to sign
such contract, instrument or document by the Company, and such authority may be
general or confined to specific instances. Checks and other orders for the
payment of money made payable to the Company may be endorsed for deposit to the
credit of the Company, with a depositary authorized by resolution of the
Company, by the Chief Financial Officer or Treasurer or such other Persons as
the Company may from time to time by resolution determine.

         16.14. SEAL. The seal of the Company shall be in such form as shall
from time to time be adopted by the Company. The seal may be used by causing it
or a facsimile thereof to be impressed, affixed or otherwise reproduced.

         16.15. BOOKS AND RECORDS. The officers of the Company shall keep
correct and complete books and records of account, including the names and
addresses of all Members and the number and class of the interest held by each,
and minutes of the proceedings of the Members at its registered office or
principal place of business, or at the office of its transfer agent or
registrar.


                                       70
<PAGE>   76

         16.16. SURETY BONDS. Such officers and agents of the Company (if any)
as the Company may direct, from time to time, shall be bonded for the faithful
performance of their duties and for the restoration to the Company, in case of
their death, resignation, retirement, disqualification or removal from office,
of all books, papers, vouchers, money and other property of whatever kind in
their possession or under their control belonging to the Company, in such
amounts and by such surety companies as the Company may determine. The premiums
on such bonds shall be paid by the Company and the bonds so furnished shall be
in the custody of the Secretary.

         16.17. AUDIT RIGHTS OF MEMBERS. (a) Each Member shall have the right to
inspect and audit the books and records of the Company to the extent necessary
to determine the accuracy of the financial statements delivered to the Members
pursuant to Section 10.2 of this Agreement. Such audits shall be conducted at
the cost of the Member(s) requesting same. The audit rights with respect to any
calendar year or any portion of such year shall terminate on and as of the last
day of the second calendar year immediately following the year in question. A
Member may exercise its audit rights hereunder by giving at least 30 days
written notice to the Company of the desire to perform such audit, which notice
shall include the estimated timing and other particulars related to such audit.
The audit shall be conducted during normal business hours of the Company. The
audit shall not unreasonably interfere with the operation of the Company. If any
financial statement is not challenged within 3 years, then it shall be presumed
to be accurate.

         (b) Any Member shall have the right to cause the Company or a
Subsidiary of the Company to exercise its inspection and audit rights, if any,
under any Construction Agreement or Operating Agreement. The costs related
thereto shall be paid by the Member(s) requesting same.

         16.18. NO THIRD PARTY BENEFICIARIES. Except to the extent a third party
is expressly given rights herein, any agreement herein contained, expressed or
implied, shall be only for the benefit of the Parties and their respective legal
representatives, successors, and assigns, and such agreements shall not inure to
the benefit of any other Person whomsoever, it being the intention of the
parties hereto that no Person shall be deemed a third party beneficiary of this
Agreement except to the extent a third party is expressly given rights herein.

         16.19. NOTICES. Except as otherwise expressly provided in this
Agreement to the contrary (including in the definition of the term Default), any
notice required or permitted to be given under this Agreement shall be in
writing (including telex, facsimile, telecopier or similar writing) and sent to
the address of the Party set forth below, or to such other more recent address
of which the sending Party actually has received written notice:

         (a) if to the Company, to:

             Ocean Breeze Pipeline Company, L.L.C.
             Attn: Mr. Doug Krenz
             200 N. Dairy Ashford, Suite 3100
             Houston, Texas 77079
             Telephone  (281) 544-2224
             Telecopy   (281) 544-2201


                                       71
<PAGE>   77

         (b) if to the Members, to each of the Members listed on Exhibit A at
the address set forth therein.

Each such notice, demand or other communication shall be effective, if given by
registered or certified mail, return receipt requested, as of the third day
after the date indicated on the mailing certificate, or if given by any other
means, when delivered at the address specified in this Section.

         16.20. REMEDIES. Except as expressly provided herein, the rights,
obligations and remedies created by this Agreement are cumulative and in
addition to any other rights, obligations or remedies otherwise available at law
or in equity. Other than the obligation to arbitrate pursuant to Section 16.21,
in lieu of seeking judicial remedies, nothing herein shall be considered an
election of remedies. In addition, any successful Party is entitled to costs
related to enforcing this Agreement, including, without limitation, attorneys'
fees, and arbitration expenses. NOTWITHSTANDING ANYTHING TO THE CONTRARY, THE
PARTIES WAIVE ANY AND ALL RIGHTS, CLAIMS OR CAUSES OF ACTION ARISING UNDER THIS
AGREEMENT FOR INCIDENTAL, CONSEQUENTIAL, PUNITIVE OR EXEMPLARY DAMAGES. A PARTY
MAY RECOVER FROM THE OTHER PARTY ALL COSTS, EXPENSES OR DAMAGES INCLUDING,
WITHOUT LIMITATION, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL, EXEMPLARY,
PUNITIVE AND OTHER DAMAGES PAID OR OWED TO ANY THIRD PARTY FOR WHICH SUCH PARTY
HAS A RIGHT TO RECOVER FROM THE OTHER PARTY.

         16.21. DISPUTES.

         (a) Applicability. Any controversy or claim, whether based on contract,
tort, statute or other legal or equitable theory (including but not limited to
any claim of fraud, misrepresentation or fraudulent inducement or any question
of validity or effect of this Agreement including this clause) arising out of or
related to this Agreement (including any amendments or extensions), or the
breach or termination thereof shall be settled by arbitration in accordance with
the then current CPR Institute Rules for Non-Administered Arbitration of
Business Disputes, and this provision. The arbitration shall be governed by the
United States Arbitration Act, 9 U.S.C. ss.ss. 1-16 to the exclusion of any
provision of Law inconsistent therewith or which would produce a different
result, and judgment upon the award rendered by the arbitrator may be entered by
any court having jurisdiction. Notwithstanding the foregoing, this Section shall
not apply to (x) any matters that, pursuant to the provisions of this Agreement,
are to be resolved by a vote of the Members or (y) any of the rights of
non-defaulting Members set forth in Section 4.3. Any dispute to which this
Section applies is referred to herein as a "Dispute." With respect to a
particular Dispute, each Person that is a party to such Dispute is referred to
herein as a "Disputing Party." The provisions of this Section shall be the
exclusive method of resolving Disputes.

         (b) Negotiation to Resolve Disputes. If a Dispute arises, the Disputing
Parties shall attempt to resolve such Dispute through the following procedure:


                                       72
<PAGE>   78

                  (i) first, each of the Disputing Parties shall promptly meet
         (whether by phone or in person) in a good faith attempt to resolve the
         Dispute.

                  (ii) second, if the Dispute is still unresolved after ten
         Business Days following the commencement of the negotiations described
         in Section 16.21(b)(i), then the chief executive officer (or his
         designee) of the direct parent of each Disputing Party shall meet
         (whether by phone or in person) in a good faith attempt to resolve the
         Dispute; and

                  (iii) third, if the Dispute is still unresolved after ten
         Business Days following the commencement of the negotiations described
         in Section 16.21(b)(ii), then any Disputing Party may submit such
         Dispute to binding arbitration under this Section by written notice to
         the other Disputing Parties (an "Arbitration Notice") delivered within
         thirty Business Days thereafter.

                  (iv) At the same time that the Disputing Member sends an
         Arbitration Notice to the other Disputing Members, it shall also send
         an Arbitration Notice to the regional office of the CPR Institute
         covering Houston, Texas. The Arbitration Notice shall contain a brief
         description of the nature of the dispute and the name of an Arbitrator
         proposed by the Disputing Member.

         (c) Selection of Arbitrator.

                  (i) Any arbitration conducted under this Section shall be
         heard by a sole arbitrator (the "Arbitrator") qualified by his or her
         education, experience and training to resolve the disputed matters and
         shall be selected in accordance with this Section. Each Disputing Party
         and each proposed Arbitrator shall disclose to the other Disputing
         Parties any business, personal or other relationship or affiliation
         that may exist between such Disputing Party and such proposed
         Arbitrator within ten Business Days following delivery of the
         Arbitration Notice.

                  (ii) The Disputing Party that submits a Dispute to arbitration
         shall designate a proposed Arbitrator in its Arbitration Notice. If any
         other Disputing Party objects for any reason to such proposed
         Arbitrator, it may, on or before the tenth Business Day following
         delivery of the Arbitration Notice, notify all of the other Disputing
         Parties of such objection. All of the Disputing Parties shall attempt
         to agree upon a mutually acceptable Arbitrator. If they are unable to
         do so within seven Business Days following delivery of the notice
         described in the immediately-preceding sentence, any Disputing Party
         may request the regional office of the CPR Institute covering Houston,
         Texas to designate the Arbitrator who shall be qualified by his or her
         education, experience and training to resolve the disputed matters.
         Failing designation by the regional office of the CPR Institute
         covering Houston, Texas, any Disputing Party may in writing request the
         judge of the United States District Court for the Southern District of
         Texas senior in term of service to appoint an Arbitrator qualified by
         his or her education, experience and training to resolve the disputed
         matters. If the Arbitrator so chosen shall die, resign or otherwise
         fail or becomes unable to serve as Arbitrator, a replacement Arbitrator
         shall be chosen in accordance with this Section.


                                       73
<PAGE>   79

         (d) Conduct of Arbitration.

                  (i) Any arbitration hearing shall be held in Houston, Texas.
         The Arbitrator shall fix a reasonable time and place for the hearing
         and shall determine the matters submitted to it pursuant to the
         provisions of this Agreement in a timely manner; provided, however, if
         the Arbitrator shall fail to hold the hearing to determine the issue in
         dispute within sixty (60) days after the selection of the Arbitrator,
         then any Disputing Member shall have the right to require a new
         Arbitrator be selected under this Section.

                  (ii) Except as expressly provided to the contrary in this
         Agreement, the Arbitrator shall have the power (i) to gather such
         materials, information, testimony and evidence as it deems relevant to
         the dispute before it (and each member will provide such materials,
         information, testimony and evidence requested by the Arbitrator, except
         to the extent any information so requested is, subject to an
         attorney-client or other privilege); (ii) to grant injunctive relief
         and enforce specific performance; and (iii) to issue or cause to be
         issued subpoenas (including subpoenas directed to third-parties) for
         the attendance of witnesses and for the production of books, records,
         documents and other evidence. Subpoenas so issued shall be served, and
         upon application to the Court by a party or the Arbitrator, enforced,
         in the manner provided by law for the service and enforcement of
         subpoenas in a civil action; and (iv) to administer oaths.

                  (iii) In advance of the arbitration hearing, the Disputing
         Members may conduct discovery in accordance with the Texas Rules of
         Civil Procedure. Such discovery may include, but is not limited to, 1)
         the taking of oral and videotaped depositions and depositions on
         written questions; 2) serving interrogatories, document requests and
         requests for admission; and 3) any other form and/or method of
         discovery provided for under the Texas Rules of Civil Procedure. The
         Arbitrator shall order the parties to promptly exchange copies of all
         exhibits and witness lists, and, if requested by a party, to produce
         other relevant documents, to answer up to ten interrogatories
         (including subparts), to respond to up to ten requests for admissions
         (which shall be deemed admitted if not denied) and to produce for
         deposition and, if requested, at the hearing all witnesses that such
         party has listed and up to four other persons within such party's
         control. Any additional discovery shall only occur by agreement of the
         parties or as ordered by the Arbitrator upon a finding of good cause.
         Any objections and/or responses to such discovery shall be due on or
         before fifteen (15) days after service. The Disputing Members shall
         attempt in good faith to resolve any discovery disputes that may arise.
         If the Disputing Members are unable to resolve any such disputes, the
         Disputing Members may present their objections to the Arbitrator who
         shall resolve the objections in accordance with the Texas Rules of
         Civil Procedure. The Arbitrator may, if requested by a party, order
         that a trade secret or other confidential research, development or
         commercial information not be revealed or be revealed only in a
         designated way.

                  (iv) The Disputing Members may also retain, with the consent
         of the arbitrator, one or more experts to assist the Arbitrator in
         resolving the Dispute. The Disputing Members shall identify and produce
         a report from any experts who will give testimony and/or evidence at
         the arbitration hearing. Any testifying experts identified shall be
         made available for deposition in advance of any arbitration hearing.


                                       74
<PAGE>   80

                  (v) The Arbitrator shall render its decision in writing within
         fifteen (15) days of the conclusion of the hearing. The arbitrator
         shall have jurisdiction and authority to interpret and apply the
         provisions of this Agreement only insofar as shall be necessary in the
         determination of the dispute before it, but it shall not have
         jurisdiction or authority to add to or alter in any way the provisions
         of this Agreement. The Arbitrator's decision shall govern and shall be
         final, nonappealable (except to the extent provided in the Federal
         Arbitration Act) and binding on the Disputing Members hereto and its
         written decision may be entered in any court having appropriate
         jurisdiction. Pending resolution of any dispute hereunder, performance
         by Disputing Members shall continue so as to maintain the status quo
         prior to notice of such dispute and service of notice of arbitration by
         any Disputing Member shall not divest a court of competent jurisdiction
         of the right and power to grant a decree compelling specific
         performance or injunctive relief in an action brought by the Disputing
         Members. THE ARBITRATOR AND ANY COURT ENFORCING THE AWARD OF THE
         ARBITRATOR SHALL NOT HAVE THE RIGHT OR AUTHORITY TO AWARD
         CONSEQUENTIAL, INCIDENTAL, INDIRECT, SPECIAL, PUNITIVE OR EXEMPLARY
         DAMAGES TO THE COMPANY OR ANY DISPUTING MEMBERS. PROVIDED, HOWEVER,
         THAT THE ARBITRATOR MAY AWARD ALL COSTS, EXPENSES OR DAMAGES INCLUDING,
         WITHOUT LIMITATION, INDIRECT, SPECIAL CONSEQUENTIAL, INCIDENTAL,
         EXEMPLARY, PUNITIVE AND OTHER DAMAGES PAID OR OWED TO ANY THIRD PARTY
         FOR WHICH A PARTY HAS A RIGHT TO RECOVER FROM THE OTHER PARTY.

                  (vi) The responsibility for paying the costs and expenses of
         the arbitration, including compensation to the Arbitrator, shall be
         allocated among the Disputing Members in a manner determined by the
         Arbitrator to be fair and reasonable under the circumstances. Each
         Disputing Member shall be responsible for the fees and expenses of its
         respective counsel, consultants and witnesses, unless the Arbitrator
         determines that compelling reasons exist for allocating all or a
         portion of such costs and expenses to one or more other Disputing
         Members.

         16.22. NO SHOP. Prior to the date on which the Members vote to accept
or reject the Construction Certificate as contemplated by Section 3.17, no
Member (including its Affiliates) shall directly or indirectly solicit, initiate
or encourage submission of or participate in negotiations or take any action
with respect to, proposals or offers (including any from any third party) to
participate jointly in constructing, operating or owning pipelines or related
facilities of the type described herein (or any similar facilities) to gather or
transport gas from the Dedicated Leases which was not committed pursuant to a
written gathering or transportation agreement executed prior to December 1,
1995, or engage in any other transaction contemplated by this Agreement. Each
Member hereto agrees to advise the other Members in writing with respect to any
solicitation, indications of interest or other inquiries (of the type described
in the immediately preceding sentence) initiated by any party hereto or any
third party pertaining to the subject matter of this Agreement. Notwithstanding
anything to the contrary contained in this paragraph, it shall not be a
violation of the exclusivity provisions of this Agreement if (i) due to the size
of its respective operations, a representative of a Member or its Affiliates,
which representative is not aware of this Agreement, inadvertently violates the
exclusivity provisions of


                                       75
<PAGE>   81

this Agreement and (ii) such violation is ceased and notice thereof delivered to
the other Members promptly upon discovery of same by such Member, nor shall it
be a violation to engage in such undertakings solely as they pertain to gas
excepted from the dedication provisions of the Dedication Agreements.

         16.23. MEMBER TRADEMARKS. Neither the Company nor any Member shall be
permitted to use any trademark owned by any other Member or its Affiliates,
including, without limitation, the Shell "Pecten" trademark, without the express
written consent of such Member or its Affiliate or as otherwise required by Law.

         16.24. HOLDING-OUT. Except as required by Law, the Company shall not
publicly indicate that it is affiliated with Shell Oil Company or any of its
Affiliates, without the express written consent of Shell Holding or an Affiliate
thereof.



              [THE REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]


                                       76
<PAGE>   82


         IN WITNESS WHEREOF, the Members have executed this Agreement as of the
date first set forth in this Agreement.


                                       MEMBERS:


                                       By: /s/ JAMES H. LYTAL
                                          -------------------------------------
                                       Printed Name: James H. Lytal
                                                    ---------------------------
                                       Title: President
                                             ----------------------------------



                                       MARATHON GAS TRANSMISSION INC.




                                       By: /s/ R. G. BECKER
                                          -------------------------------------
                                       Printed Name: R. G. Becker
                                                    ---------------------------
                                       Title: President
                                             ----------------------------------






                                       SHELL SEAHORSE COMPANY




                                       By: /s/ D.V. KRENZ
                                          -------------------------------------
                                       Printed Name: D.V. Krenz
                                                    ---------------------------
                                       Title: President
                                             ----------------------------------


EXHIBITS:
Exhibit A:        Ownership Information
Exhibit B:        Description of Initial Facilities
Exhibit C:        Insurance



                                       77
<PAGE>   83



                                    EXHIBIT A
                              OWNERSHIP INFORMATION

<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------------
                  NAME AND INITIAL CAPITAL                         INITIAL CAPITAL          MEMBERSHIP
                 CONTRIBUTION OF EACH MEMBER                        CONTRIBUTIONS            INTEREST
- ----------------------------------------------------------------------------------------------------------
<S>     <C>                                                       <C>                     <C>
1)       Leviathan Holding:                                              (1)                  25.67%
         Sailfish Pipeline Company, L.L.C.
         Attention:  Grant E. Sims
         7200 Texas Commerce Tower
         600 Travis
         Houston, Texas  77002
         Telephone: 713/224-7400
         Facsimile: 713/547-5151
- ----------------------------------------------------------------------------------------------------------
2)       Shell Holding:(4)                                               (2)                  50.00%
         Shell Seahorse Company
         Attention: Mr. Doug Krenz, President
         200 North Dairy Ashford, Suite 3100
         Houston, Texas 77079
         Telephone: (281) 544-2224
         Facsimile: (281) 544-2201
- ----------------------------------------------------------------------------------------------------------
3)       Marathon Holding:                                               (3)                  24.33%
         Marathon Gas Transmission Inc.
         Attention: Mr. William H. Hastings
         5555 San Felipe
         P.O. Box 3128
         Houston, Texas 77253-3128
         Telephone: (713) 296-3715
         Facsimile: (713) 296-4480
- ----------------------------------------------------------------------------------------------------------
</TABLE>

(1)  Leviathan Holding shall make or cause to be made Initial Capital
     Contributions equal to:

     (a)  Contribution of amounts equal to the cash paid by Leviathan Holding on
          behalf of the Company for certain costs and expenses related to the
          formation of the Company and incurred by Leviathan Holding prior to
          the date hereof.

     (b)  Contribution of 1% of Leviathan Holding's membership interest in
          Nautilus and Manta Ray of 25.67%;

(2)  Shell Holding shall make or cause to be made Initial Capital Contributions
     equal to:

     (a)  Contribution of amounts equal to the cash paid by Shell Holding on
          behalf of the Company for certain costs and expenses related to the
          formation of the Company and incurred by Shell Holding prior to the
          date hereof;


                                       A-1

<PAGE>   84

     (b)  Contribution of 1% of Shell Holding's membership interest in Nautilus
          and Manta Ray of 50.00%

(3)  Marathon Holding shall make or cause to be made Initial Capital
     Contributions equal to:

     (a)  Contribution of amounts equal to the cash paid by Marathon Holding and
          its Affiliates on behalf of the Company for certain costs and expenses
          related to the formation of the Company and incurred by Marathon
          Holding and its Affiliates prior to the date hereof;

     (b)  Contribution of 1% of Marathon Holding's membership interest in a
          Nautilus and Manta Ray of 24.33%

(4)  Initial Tax Matters Member.


                                      A-2

<PAGE>   85

                                    EXHIBIT B
                    CERTAIN MANTA RAY AND NAUTILUS FACILITIES

I.   Manta Ray Initial Facilities

     A.   Manta Ray Phase I Facilities

          1.   Pipeline Segments

               a.   Approximately 51 miles of 16" pipeline from Green Canyon
                    Block 29 to Ship Shoal Block 207.

               b.   Approximately 32 miles of 14" pipeline from South Timbalier
                    Block 301 to Ship Shoal Block 207.

               c.   Approximately 1 mile of 10" pipeline within Ship Shoal Block
                    240.

               d.   Approximately 3 miles of 12" pipeline from Ship Shoal Block
                    259 to Ship Shoal Block 261.

               e.   Approximately 6 miles of 16" pipeline from Ship Shoal Block
                    207 to Ship Shoal Block 181, to be contributed to the
                    Company by Poseidon Pipeline Company, L.L.C.

               f.   Approximately 6 miles of 12" pipeline from South Timbalier
                    Block 277 to South Timbalier Block 292.

               g.   Approximately 4 miles of 12" pipeline from South Timbalier
                    Block 292 to South Timbalier Block 280.

               h.   Approximately 18 miles of 24" pipeline from South Timbalier
                    Block 292 to South Timbalier Block 300.

               i.   Approximately 7 miles of 14" pipeline from Ship Shoal Block
                    332 to South Timbalier Block 301.

               j.   Approximately 7 miles of 16" pipeline from Ship Shoal Block
                    332 to South Timbalier Block 301.

               k.   Approximately 17 miles of 16" pipeline from Green Canyon
                    Block 19 to Ship Shoal Block 332.

               l.   Approximately 9 miles of 16" pipeline from Ship Shoal Block
                    349 to Ewing Bank Block 990.


                                      B-1

<PAGE>   86

          2.   Pipeline Related Facilities shall include:

               a.   GREEN CANYON 19A

                    (1)  24" x 0.688" Riser with a 24" - 900# SDV

                    (2)  20" x 16" Pig Launcher

                    (3)  Corrosion Inhibitor Injection Skid with Sidewinder pump

                    (4)  Dual 6" Orifice Meter Skid
                         Design 1,720 psig @ 130 Degrees F

                    (5)  Standard Gas Metering Station EFM Equipment

               b.   GREEN CANYON 18A

                    (1)  Standard Gas Metering Station EFM Equipment

               c.   GREEN CANYON 65A

                    (1)  Standard Gas Metering Station EFM Equipment

               d.   EWING BANK 947A

                    (1)  Standard Gas Metering Station EFM Equipment

               e.   SHIP SHOAL 349A

                    (1)  16" x 0.688" Riser with a 16" - 900# SDV

                    (2)  18" x 16" Pig Launcher

                    (3)  Corrosion Inhibitor Injection Skid with Sidewinder pump

                    (4)  Dual 10" Orifice Meter Skid
                         Design 1,550 psig @ 250 Degrees F

                    (5)  Standard Gas Metering System EFM Equipment

               f.   SHIP SHOAL 240A

                    SS240 Lateral is owned 51% by Manta Ray Gathering Company,
                    L.L.C. and 49% by ANR.

                    (1)  10.75" x 0.594" Riser with 10" - 900# SDV

                    (2)  12" x 10" Pig Launcher

                    (3)  Corrosion Inhibitor Injection Skid with Sidewinder pump

                    (4)  Dual 8" Orifice Meter Skid
                         Design = 2,220 psig @ 100 Degrees F

                    (5)  Standard Gas Metering Station EFM Equipment

                    Manta Ray Offshore ownership is everything downstream of 6"
                    - 900# flange at inlet of Gas Meter Skid.


                                      B-2

<PAGE>   87

               g.   SHIP SHOAL 259JA

                    (1)  12.75" x 0.688" Riser with 12" - 900# SDV

                    (2)  Corrosion Inhibitor Injection with Sidewinder pump

                    (3)  Dual 10" Orifice Meter Skid
                         Design = 1,480 psig @ 120 Degrees F

                    Manta Ray Offshore ownership is everything downstream of 10"
                    - 600# flange at inlet of Gas Meter Skid.

                    Note: No pig launcher.

                    EFM equipment is owned by William Field Services, who
                    provide a monthly calibration service for a fee ($1,000).

               h.   SOUTH TIMBALIER 295A

                    Manta Ray Offshore presently owns nothing on this platform.
                    The Riser and Meter Station are owned by Shell Offshore
                    Inc.. The EFM equipment is owned by Williams Field Services
                    who provides monthly calibration services for a fee
                    ($1,000). When the 24" pipeline which originates at ST 292
                    is extended to SS 332 in 1997, Manta Ray will install its
                    EFM equipment and remove Williams'. This will eliminate the
                    fee.

               i.   SOUTH TIMBALIER 277A

                    (1)  12.75" x 0.500" Riser

                    (2)  14" x 12" Pig Launcher

                    (3)  Corrosion Inhibitor Injection Skid with Sidewinder pump

                    (4)  Single 8" Orifice Meter

                    (5)  Barton Model 202E Chart Recorder

                    (6)  Welker Model GS-4 Composite Gas Sampler

               j.   SOUTH TIMBALIER 300A

                    (1)  24" x 0.625" Riser (inbound) with 24" - 900# SDV

                    (2)  30" x 24" Pig Receiver

                    (3)  Miscellaneous valves and fittings

               k.   SOUTH TIMBALIER 292A

                    (1)  24" x 0.625" Riser (outbound) with a 24" - 900# SDV

                    (2)  30" x 24" Pig Launcher

                    (3)  Corrosion Inhibitor Injection Skid with Sidewinder Pump

                    (4)  Dual 8" Orifice Meter

                    (5)  12.75" x 0.500' Riser (outbound) with 12" - 600# SDV


                                      B-3

<PAGE>   88

                    (6)  Corrosion Inhibitor Injection Skid with Sidewinder Pump

                    (7)  Dual 10" Orifice Meter

                    (8)  Welker Model GS-4 Composite Gas Sampler

                    (9)  12.75" x 0.500" Riser (incoming) with 12" - 600# SDV

                    (10) 14" x 12" Pig Receiver


               l.   SHIP SHOAL 207 DWPF

                    (1)  8 Pile Platform

                    (2)  16" x 0.625" Riser (inbound gas) with 16" - 900# SDV

                    (3)  18" x 16" Pig Receiver

                    (4)  H.P. Relief Scrubber

                    (5)  L.P. Relief Scrubber

                    (6)  Platform Sump System

                    (7)  14" - 600# Check Valve, 14" - 600# FCV and (2) 14" 600#
                         Block Valves

                    (8)  (2) Bad Oil Tanks. Capacity = 1,200 BBL each

                    (9)  (2) Waukesha - Pearce Generators 550 KW each

                    (10) 14" x 0.625" Riser (inbound) with 14" - 900# SDV

                    (11) 16" x 14" Pig Receiver

                    (12) 16" x 0.406" Riser (outbound) with 16" - 600# SDV

                    (13) 18" x 16" Pig Launcher

                    (14) PECO Instrument Fuel Gas Filter

                    (15) EFM Equipment (SS 207)

                    (16) 8" Oil line which crosses bridge to platform

                    (17) Seaking Series 42 Model SK 1900 Crane

                    (18) 15' x 15' Parts Building

                    Note: Oil Metering Skid and Prover Loop are property of
                    Poseidon Pipeline Company, L.L.C.

               m.   SHIP SHOAL 332A

                    (1)  16" x 0.562" Riser (inbound) with 16" - 900# SDV

                    (2)  18" x -16" Pig Receiver

                    (3)  12" - 1500# FCV, (2) 12" - 1500# Block Valves and 12" -
                         1500# Check valve allocated on Sub-Cellar Deck; 12" -
                         900# FCV and 12" - 600# Check valve located on
                         Sub-Cellar Deck; (2) 12" - 600# FCVs located on Cellar
                         deck.

                    (4)  20" Pipeline Manifold

                    (5)  8" - 900# FCV

                    (6)  Dual 12" and 10" Orifice Meter (to TGPL)

                    (7)  18" x 16" Pig Launcher

                    (8)  16" x 0.625" Riser (outbound) with 16" - 900# SDV

                    (9)  16" x 14" Pig Launcher

                    (10) 14" x 0.438" Riser (outbound) with 14" - 900# SDV


                                      B-4

<PAGE>   89

                    (11) EFM Equipment (SS 332)

                    (12) Certain Dehydration Facilities (as described in the
                         relevant contribution agreement)

               n.   PARTS LISTS FOR METERING STATIONS

                    (1)  Typical Gas Metering Station Installation (See
                         Attachment 1.)

                    (2)  Platform SS 207 (See Attachment 2.)

                    (3)  Platform SS 332 (See Attachment 3.)

          B.   Manta Ray Phase II Facilities

               1.   Pipeline Segments

                    a.   Approximately 47 miles of 24" pipeline from Green
                         Canyon Block 65 to Ship Shoal Block 207.

                    b.   Approximately 7 miles of 24" pipeline from South
                         Timbalier Block 300 to Ship Shoal Block 332.


               2.   Pipeline Related Facilities

                    a.   A 24" export riser located on Shell Offshore Inc.'s
                         platform in Green Canyon Block 65.

                    b.   A 24" import riser located on Manta Ray Offshore
                         Gathering Company L.L.C.'s Ship Shoal 207 platforms.

                    c.   A 24" import riser located on Manta Ray Gathering
                         Company, L.L.C.'s Ship Shoal 332 platforms ("SS332
                         platforms").

                    d.   A slug catcher and related facilities located on the
                         SS207 platforms.

                    e.   A slug catcher and related facilities located at the
                         inlet of Exxon U.S.A's Garden City Gas Plant.

     II.  Nautilus Initial Facilities

          A.   Pipeline Segments

               A 30" Pipeline from SS207 to the inlet of the Garden City Gas
               Plant, including a lateral to the Burns Point Gas Plant, risers,
               and other appurtenant facilities.

          B.   Pipeline Related Facilities

                           A 30" export riser located on the Ship Shoal 207
                           platform.


                                      B-5

<PAGE>   90


                                    EXHIBIT C

                                    INSURANCE

<TABLE>
<CAPTION>
                          Coverage                             Per Occurrence                  Per Occurrence
                          --------                             Limit of Liability              Deductible
                                                               ------------------              ----------
<S>      <C>                                                  <C>                             <C>

I.       To be carried by the Company, if applicable

         1.       Workers' Compensation                        Per statute                     None
                  Employers Liability/                         $ 1,000,000                     None
                  Maritime E.L.

         2.       Automobile Liability                         $ 1,000,000                     $250,000

II.      If the Company owns or bareboat charters watercraft these coverages will be carried by the Company:

         A.       Hull/Machinery, including                    $10,000,000                     $250,000
                  Collision Liability

         B.       Protection & Indemnity,                      $ 1,000,000                     $250,000
                  including crew coverage
                  and Excess Collision Liability
</TABLE>


                                       C-1


<PAGE>   1

                                                                   EXHIBIT 10.17


                       LIMITED LIABILITY COMPANY AGREEMENT

                                       OF

                           NEMO GATHERING COMPANY, LLC

                     (a Delaware limited liability company)

                          (Dated as of July 26, 1999)



<PAGE>   2



<TABLE>
<S>                                                                           <C>
ARTICLE I. DEFINITIONS.........................................................1
   1.1.  Specific Definitions..................................................1
   1.2.  Other Terms .........................................................13
   1.3.  Construction ........................................................13

ARTICLE II. ORGANIZATION......................................................14
   2.1.  Formation............................................................14
   2.2.  Name.................................................................14
   2.3.  Principal Office in the United States; Other Offices.................14
   2.4.  Purpose..............................................................14
   2.5.  Foreign Qualification................................................14
   2.6.  Term.................................................................14
   2.7.  Mergers and Exchanges................................................14
   2.8.  Business Opportunities--No Implied Duty or Obligation................14
   2.9.  Jurisdictional Status................................................15

ARTICLE III. MEMBERSHIP INTERESTS AND TRANSFERS...............................15
   3.1.  Initial Members......................................................15
   3.2.  Membership Interests.................................................15
   3.3.  Representations and Warranties.......................................15
   3.4.  Restrictions on the Transfer of a Membership Interest................16
   3.5.  Transfer Restrictions................................................17
   3.6.  Documentation; Validity of Transfer..................................22
   3.7.  Possible Additional Restrictions on Transfer.........................23
   3.8.  Additional Membership Interests......................................23
   3.9.  [RESERVED]...........................................................23
   3.10. Information..........................................................23
   3.11. Liability to Third Parties...........................................24
   3.12. Resignation..........................................................24
   3.13. Lack of Member Authority.............................................24

ARTICLE IV. CAPITAL CONTRIBUTIONS.............................................25
   4.1.  Initial Capital Contributions........................................25
   4.2.  Subsequent Contributions.............................................25
   4.3.  Failure to Contribute................................................25
   4.4.  Return of Contributions..............................................28
   4.5.  Capital Accounts.....................................................28

ARTICLE V. ALLOCATIONS AND DISTRIBUTIONS......................................31
   5.1.  Allocations for Capital Account Purposes.............................31
   5.2.  Allocations for Tax Purposes.........................................33
   5.3.  Requirement of Distributions.........................................35
   5.4.  Sharing of Distributions.............................................35
   5.5.  Reserves.............................................................36
   5.6.  Distribution Restrictions............................................36
</TABLE>


                                        i
<PAGE>   3



<TABLE>
<S>                                                                          <C>
ARTICLE VI. MANAGEMENT OF THE COMPANY.........................................36
   6.1.  Management and Delegation of Authority...............................36
   6.2.  Committees...........................................................36
   6.3.  Authority of Members and Committees..................................37
   6.4.  Officers.............................................................39
   6.5.  Duties of Officers...................................................41
   6.6.  No Duty to Consult...................................................41
   6.7.  Reimbursement........................................................41
   6.8.  Members and Affiliates Dealing With the Company......................41
   6.9.  Insurance............................................................41

ARTICLE VII. MEETINGS.........................................................42
   7.1.  Meetings of Members and Committees...................................42
   7.2.  Special Actions......................................................43
   7.3.  Voting List..........................................................46
   7.4.  Proxies..............................................................46
   7.5.  Votes................................................................47
   7.6.  Conduct of Meetings..................................................47
   7.7.  Action by Written Consent............................................47
   7.8.  Records..............................................................48

ARTICLE VIII. INDEMNIFICATION.................................................48
   8.1.  Right to Indemnification.............................................48
   8.2.  Indemnification of Officers, Employees and Agents....................49
   8.3.  Advance Payment......................................................49
   8.4.  Appearance as a Witness..............................................49
   8.5.  Nonexclusivity of Rights.............................................49
   8.6.  Insurance............................................................49
   8.7.  Member Notification..................................................49
   8.8.  Savings Clause.......................................................50
   8.9.  Scope of Indemnity...................................................50

ARTICLE IX. TAXES.............................................................50
   9.1.  Tax Returns..........................................................50
   9.2.  Tax Elections........................................................50
   9.3.  Tax Matters Member...................................................51

ARTICLE X. BOOKS, RECORDS, REPORTS, AND BANK ACCOUNTS.........................51
   10.1. Maintenance of Books.................................................51
   10.2. Financial Statements.................................................51
   10.3. Tax Statements.......................................................51
   10.4. Accounts.............................................................51

ARTICLE XI. BANKRUPTCY OF A MEMBER............................................52
   11.1. Bankrupt Members.....................................................52
</TABLE>


                                       ii
<PAGE>   4


<TABLE>
<S>                                                                          <C>
ARTICLE XII. DISSOLUTION, LIQUIDATION, AND TERMINATION........................53
   12.1. Dissolution..........................................................53
   12.2. Liquidation and Termination..........................................53
   12.3. Provision for Contingent Claims......................................55
   12.4. Deficit Capital Accounts.............................................55

ARTICLE XIII. AMENDMENT OF THE AGREEMENT......................................55
   13.1. Amendments to be Adopted by the Company..............................55
   13.2. Amendment Procedures.................................................56

ARTICLE XIV. CERTIFICATED MEMBERSHIP INTERESTS................................56
   14.1. Entitlement to Certificates..........................................56
   14.2. Multiple Classes of Interest.........................................56
   14.3. Signatures...........................................................57
   14.4. Issuance and Payment.................................................57
   14.5. Restrictive Legend...................................................57
   14.6. Lost, Stolen or Destroyed Certificates...............................58
   14.7. Transfer of Membership Interest......................................58
   14.8. Registered Holders...................................................58

ARTICLE XV. OTHER MEMBER AGREEMENTS AND OBLIGATIONS...........................58
   15.1. Lateral Opportunities................................................58
   15.2. Expansion Option.....................................................60

ARTICLE XVI. GENERAL PROVISIONS...............................................62
   16.1. Offset...............................................................62
   16.2. Entire Agreement; Supersedure........................................62
   16.3. Waivers..............................................................62
   16.4. Binding Effect.......................................................62
   16.5. Member Deadlocks; Negotiations and Mediation.........................62
   16.6. Governing Law; Severability..........................................64
   16.7. Further Assurances...................................................64
   16.8. Exercise of Certain Rights...........................................64
   16.9. Notice to Members of Provisions of this Agreement....................65
   16.10.Counterparts.........................................................65
   16.11.Attendance via Communications Equipment..............................65
   16.12.Reports to Members...................................................66
   16.13.Checks, Notes and Contracts..........................................66
   16.14.Seal.................................................................66
   16.15.Books and Records....................................................66
   16.16.Surety Bonds.........................................................66
   16.17.Audit Rights of Members..............................................66
   16.18.No Third Party Beneficiaries.........................................67
   16.19.Notices..............................................................67
   16.20.Remedies.............................................................67
</TABLE>


                                       iii
<PAGE>   5





<TABLE>
<S>                                                                          <C>
   16.21.Disputes.............................................................67
   16.22.Member Trademarks....................................................71
   16.23.Holding-Out..........................................................72
</TABLE>



EXHIBITS:
Exhibit A:        Ownership Information
Exhibit B:        Description of Initial Facilities
Exhibit C:        Insurance
Exhibit D:        Sample Calculation of IRR



                                       iv
<PAGE>   6



                       LIMITED LIABILITY COMPANY AGREEMENT

                                       OF

                         NEMO GATHERING COMPANY, L.L.C.
                     (a Delaware limited liability company)

         This Limited Liability Company Agreement of Nemo Gathering Company, LLC
(the "Company") dated as of July 26, 1999, is (a) adopted by the Members (as
defined below) and (b) executed and agreed to, for good and valuable
consideration, by the Members.

         WHEREAS, the Members desire to form the Company in connection with the
construction, ownership and operation of certain pipelines; and

         WHEREAS, the Company will construct, own, operate and maintain the
Brutus Gathering Facilities.

         NOW, THEREFORE, for and in consideration of the premises and the mutual
covenants and agreements contained herein and other good and valuable
consideration (the receipt and sufficiency of which are hereby confirmed and
acknowledged), the parties hereto hereby stipulate and agree as follows:

                                   ARTICLE I.

                                   DEFINITIONS

         1.1. Specific Definitions. As used in this Agreement, the following
terms have the following meanings:

         "Accelerated Volumes" means the increment of natural gas volumes
produced from existing, flowing Dedicated Leases or third party leases,
whichever is applicable, which require an Expansion Project pursuant to Section
15.2, provided that such volumes, for the purposes of this definition, shall be
limited to Dedicated Leases or third party leases, whichever is applicable, from
which the increases in volume are attributable to an acceleration of reserves
production, and not an increase in overall reserves.

         "Accessible Capacity" means that portion of the Base Capacity which is
commercially useable for gas gathering or transportation taking into
consideration hydraulics, geographic proximity and other similar factors to
transport relevant additional Expansion Property Production.

         "Act" means the Delaware Limited Liability Company Act and any
successor statute, as amended from time to time.

         "Adjusted Capital Account" means the Capital Account maintained for
each Member as of the end of each taxable year of the Company, (a) increased by
any amounts that such Member is obligated to restore under the standards set by
Treasury Regulation section 1.704-1(b)(2)(ii)(c) (or is deemed obligated to
restore pursuant to the penultimate sentences of Treasury Regulation


                                        1
<PAGE>   7


sections 1.704-2(g)(1) and 1.704-2(i)(5)), and (b) decreased by (i) the amount
of all losses and deductions that, as of the end of such taxable year, are
reasonably expected to be allocated to such Member in subsequent years under
sections 704(e)(2) and 706(d) of the Code and Treasury Regulation section
1.751-1(b)(2)(ii), and (ii) the amount of all distributions that, as of the end
of such taxable year, are reasonably expected to be made to such Member in
subsequent years in accordance with the terms of this Agreement or otherwise to
the extent they exceed offsetting increases to such Member's Capital Account
that are reasonably expected to occur during (or prior to) the year in which
such distributions are reasonably expected to be made (other than increases as a
result of a minimum gain chargeback pursuant to Section 5.1(d) or 5.1(e)). The
foregoing definition of Adjusted Capital Account is intended to comply with the
provisions of Treasury Regulation section 1.704-1(b)(2)(ii)(d) and shall be
interpreted consistently therewith.

         "Adjusted Property" means any property, the Carrying Value of which has
been adjusted pursuant to Section 4.5(c)(i) or (c)(ii).

         "Affiliate" means, with respect to any Person, any other Person that
directly or indirectly, through one or more intermediaries, Controls, is
Controlled by, or is under common Control with, the relevant Person.

         "Agreement" means this Limited Liability Company Agreement (including
any schedules, exhibits or attachments hereto), as amended, supplemented or
modified from time to time.

         "Arbitrator" has the meaning given that term in Section 16.21.

         "Arbitration Notice" has the meaning given that term in Section 16.21.

         "Asset Value" of any Contributed Property or Adjusted Property means
the fair market value of such property or other consideration at the time of
contribution or adjustment, as applicable, and as determined by the Company
using such reasonable method of valuation as it may adopt. The Company shall, in
its sole discretion, use such method as it deems reasonable and appropriate to
allocate the aggregate Asset Value of Contributed Properties or Adjusted
Properties in a single or integrated transaction among such properties on a
basis proportional to their fair market value. The fair market value of the
Contributed Properties described on Exhibit A shall be deemed to be the Asset
Value of such Contributed Properties set forth therein.

         "Available Cash" means unrestricted cash and cash equivalents of the
Company. Available Cash shall not include any Initial Capital Contributions
except to the extent that all of the Members agree that the applicable portion
of any such Initial Capital Contribution is no longer needed to finance the
construction of the Initial Facilities.

         "Bankrupt Member" means any Member:

               (a) that (i) makes a general assignment for the benefit of
               creditors; (ii) files a voluntary bankruptcy petition; (iii)
               becomes the subject of an order for relief or is declared
               insolvent in any federal or state bankruptcy or insolvency
               proceeding; (iv) files a petition or answer seeking for the
               Member a reorganization, arrangement, composition, readjustment,
               liquidation, dissolution, or similar relief


                                        2
<PAGE>   8


               under any law; (v) files an answer or other pleading admitting or
               failing to contest the material allegations of a petition filed
               against the Member in a proceeding of the type described in
               subclauses (i) through (iv) of this clause (a); or (vi) seeks,
               consents, or acquiesces to the appointment of a trustee,
               receiver, or liquidator of the Member or of all or any
               substantial part of the Member's properties; or

               (b) against which a proceeding seeking reorganization,
               arrangement, composition, readjustment, liquidation, dissolution,
               or similar relief under any law has been commenced and 90 days
               have expired without dismissal thereof or with respect to which,
               without the Member's consent or acquiescence, a trustee,
               receiver, or liquidator of the Member or of all or any
               substantial part of the Member's properties has been appointed
               and 60 days have expired without such appointments having been
               vacated or stayed, or 60 days have expired after the date of
               expiration of a stay, if the appointment has not previously been
               vacated.

         "Base Capacity" means the maximum throughput capacity on the Brutus
Gathering Facilities immediately before the commencement of the relevant
Expansion Project and any additional capacity thereafter created by any
succeeding Expansion Project approved by Members holding at least the applicable
Required Interest or pursuant to Section 15.2 for which payout has occurred.

         "Book-Tax Disparity" means with respect to any item of Contributed
Property or Adjusted Property, as of the date of any determination, the
difference between the Carrying Value of such Contributed Property or Adjusted
Property and the adjusted basis thereof for federal income tax purposes as of
such date. A Member's share of the Company's Book-Tax Disparities in all of its
Contributed Property and Adjusted Property will be reflected by the difference
between such Member's Capital Account balance as maintained pursuant to Section
4.5 and the hypothetical balance of such Member's Capital Account computed as if
it had been maintained strictly in accordance with federal income tax accounting
principles. The determination of Book-Tax disparity and a Member's share thereof
shall be determined consistently with section 1.704-3(c) of the Treasury
Regulations.

         "Brutus Gathering Facilities" means the Initial Facilities and any
other natural gas pipelines, including, without limitation, Laterals and/or
Expansion Projects, and related facilities constructed, purchased, or otherwise
acquired by the Company in accordance with the terms and conditions of this
Agreement.

         "Business Day" means Monday through Friday of each week, except that a
legal holiday recognized as such by the government of the United States or the
State of Texas shall not be regarded as a Business Day.

         "Capacity Request" has the meaning given that term in Section 15.2.

         "Capital Account" means the capital account maintained for each Member
pursuant to Section 4.5.

         "Capital Contribution" means any contribution by a Member to the
capital of the Company, as contemplated by Section 4.5(a).


                                        3
<PAGE>   9


         "Carrying Value" means (a) with respect to Contributed Property and
Adjusted Property, the Asset Value of such property reduced (but not below zero)
by all depreciation, amortization and cost recovery deductions relating to such
property charged to the Members' Capital Accounts, and (b) with respect to any
other Company property, the adjusted basis of such property for federal income
tax purposes, all as of the time of determination. The Carrying Value of any
property shall be adjusted from time to time in accordance with Sections
4.5(c)(i) and (c)(ii), and to reflect changes, additions or other adjustments to
the Carrying Value for dispositions and acquisitions of Company properties, as
deemed appropriate by the Company.

         "Certificate" has the meaning given that term in Section 2.1.

         "Change in Member Control" means, with respect to any Member that is
not an individual, (a) the transfer of Voting Stock issued by the relevant
Member resulting in a change in the Member Parent of such Member, and (b) the
transfer (whether by a direct assignment, a sale of all or substantially all of
the assets of the Member Parent or any Person which Controls any Member Parent,
or a merger, consolidation, conversion, share exchange or similar statutory
reorganization) of any Voting Stock of any Member Parent or any Person which
Controls any Member Parent.

         "Code" means the Internal Revenue Code of 1986 and any successor
statute, as amended from time to time.

         "Company" means Nemo Gathering Company, LLC, a Delaware limited
liability company, and its permitted successors and assigns.

         "Company Minimum Gain" means the amount determined pursuant to Treasury
Regulation section 1.704-2(d).

         "Company Operating Cash Flow" means, with respect to all taxable years
or other periods of the Company preceding the calendar quarter in which the
determination is being made, an amount (not less than zero) equal to the sum of
(a) the Leviathan Holding Operating Cash Flow and (b) the Tejas Holding
Operating Cash Flow.

         "Construction Agreement" means the Construction Management Agreement
dated of even date herewith between Tejas Holding and the Company.

         "Contributed Property" means each property or other asset, in such form
as may be permitted by the Act, but excluding cash or cash equivalents,
contributed to the Company. Once the Carrying Value of a Contributed Property is
adjusted pursuant to Section 4.5(c), such property shall no longer constitute a
Contributed Property for purposes of Section 5.2, but shall be deemed an
Adjusted Property for such purposes.

         "Control" (and its derivatives and similar terms) means having the
ability to direct or cause the direction of the management and policies of any
Person by ownership of Voting Stock, contract or otherwise. Notwithstanding the
foregoing, the Company and its Subsidiaries shall be deemed not to Control, be
Controlled by, or be under common Control with any of Tejas Holding or any of
its Affiliates, and vice-versa, or Leviathan Holding or any of its Affiliates,
and vice-versa.


                                        4
<PAGE>   10


         "Costs" has the meaning given that term in Section 4.3(a)(ii)(3).

         "CPR Institute" has the meaning given that term in Section 3.5(d).

         "Dedicated Leases" shall have the meaning ascribed to it in the
Gathering Agreement.

         "Dedicated Production" means the natural gas produced from the
Dedicated Leases that is owned by or allocable to SDDI, or any Affiliate
thereof, or any non-Affiliated party owning a record title or operating rights
interest in any Dedicated Lease, and which natural gas is gathered by the Brutus
Gathering Facilities pursuant to either the Gathering Agreement or other written
gathering agreement.

         "Dedicated Property Revenues" means any and all revenues and income of
the Company resulting from or otherwise attributable to the Dedicated
Production.

         "Default" means, in respect of any Member, upon the occurrence and
during the continuation of any of the following events:

               (a) the failure to remedy, within seven Business Days of such
               Member's receipt of written notice thereof from the Company or
               any other Member, a Member's delinquency in making any Capital
               Contribution to the Company as required pursuant to Section 4.1
               or 4.2;

               (b) the occurrence of any event that causes such Member to become
               a Bankrupt Member; or

               (c) the failure to remedy, within ten Business Days of receipt of
               written notice thereof from the Company or any other Member, the
               non-performance of or non-compliance with any other material
               agreements, obligations or undertakings of such Member contained
               in this Agreement.

         "Default Interest Rate" means a rate per annum, compounded monthly
equal to the lesser of (a) 4% plus the one year LIBOR rate quoted in the Wall
Street Journal (or, in its absence, a similar publication) on the first day of
the applicable month and (b) the maximum rate permitted by applicable laws.

         "Delinquent Member" has the meaning given that term in Section 4.3(a).

         "Dispute" has the meaning given that term in Section 16.21.

         "Disputing Party" has the meaning given that term in Section 16.21.

         "Economic Risk of Loss" has the meaning set forth in Treasury
Regulation section 1.752-2(a).

         "Eligible Citizen" means a Person qualified to hold leases,
rights-of-way, permits, licenses or other similar agreements or documents issued
by or entered into with the United States government, and whose status as a
Member or Transferee does not or would not subject



                                        5
<PAGE>   11


the Company to a substantial risk of cancellation or forfeiture of any such
lease, right-of-way, permit, license or other similar agreement or document
issued by or entered into with the United States government. As of the date
hereof, "Eligible Citizen" means (a) a citizen of the United States, (b) an
association (including a partnership, joint tenancy in common) organized or
existing under the Laws of the United States or any state or territory thereof,
all of the members of which are citizens of the United States, (c) a corporation
organized under the Laws of the United States or of any state or territory
thereof, or (d) a limited liability company organized under the Laws of the
United States or any state or territory thereof, not more than five percent of
the voting stock, or of all the stock, of which corporation, to the best of its
knowledge, is owned or controlled by citizens of countries that deny to United
States citizens privileges to own stock in corporations holding oil and gas
leases similar to the privileges of non-United States citizens to own stock in
corporations holding an interest in oil and gas leases on federal lands.

         "Exercising Member" has the meaning given that term in Section 15.2.

         "Expanded Capacity" means, with respect to a relevant Expansion
Project, the additional throughput capacity created on the Brutus Gathering
Facilities as a result of such relevant Expansion Project built pursuant to
Section 15.2.

         "Expanded Capacity Revenues" means revenues from gathering services
provided on the Brutus Gathering Facilities, and from any other services
provided by the Company, that are attributable to the Expanded Capacity Volumes.

         "Expanded Capacity Volumes" means, for the relevant month, the lesser
of (i) the Expanded Capacity or (ii) the sum of Expansion Property Production
and Incremental Volumes.

         "Expansion Liquidation Value" has the meaning given that term in
Section 12.2(c).

         "Expansion Option" has the meaning given that term in Section 15.2.

         "Expansion Option Notice" has the meaning given that term in Section
15.2.

         "Expansion Option Period" has the meaning given that term in Section
15.2.

         "Expansion Project" means, and is exclusively limited to, the
installation of additional compression facilities on or appurtenant to the
then-existing Brutus Gathering Facilities, and/or the construction and
installation of one (1) or more additional pipelines to loop the natural gas
gathering pipeline included in the Brutus Gathering Facilities.

         "Expansion Property" has the meaning given that term in Section 15.2.

         "Expansion Property Production" has the meaning given that term in
Section 15.2.

         "FERC" means the Federal Energy Regulatory Commission or any successor
or replacement Person.

         "Foreclosure Transfer" means any Transfer resulting from any judicial
or non-judicial foreclosure by the holder of a Security Interest or any Transfer
to the holder of a Security Interest


                                        6
<PAGE>   12


in connection with a workout or similar arrangement or any transfer from the
holder of a Security Interest.

         "GAAP" means generally accepted accounting principles, consistently
applied.

         "Gas Contract" means any contract, agreement or other obligation of the
Company to purchase fuel gas, buy or sell linepack gas or transport, exchange,
gather, process or otherwise handle natural gas.

         "Gathering Agreements" means that certain (i) Gathering Agreement, (ii)
Dedication Agreement and (iii) Gas Gathering Rate Agreement, each dated of even
date herewith between the Company and SDDI.

         "General Interest Rate" means a rate per annum, compounded monthly,
equal to the lesser of (a) the sum of the one year LIBOR rate quoted in the Wall
Street Journal (or, in its absence, a similar publication) on the first day of
the applicable month, plus one percent (1%) and (b) the maximum rate permitted
by applicable laws.

         "Incremental Volumes" means, with respect to a relevant Expansion, the
aggregate volumes gathered during any month by the Brutus Gathering Facilities
in excess of the Base Capacity in effect immediately prior to such Expansion
Project; provided, however, that the Incremental Volumes shall be applied to
Expansion Projects which have not paid out pursuant to Article XV in
chronological order of completion.

         "Initial Capital Contribution" has the meaning given that term in
Section 4.1 herein.

         "Initial Facilities" means the natural gas pipelines and related
facilities described in Exhibit B and to be constructed pursuant to that certain
Construction Management Agreement between the Company and Tejas Offshore
Pipeline, L.L.C.

         "Interconnect Agreement" means _______________________.

         "Knowledge" means, with respect to a Member, the actual knowledge of
the officers and business development personnel of such Member and the actual
knowledge of executive officers of (i) in the case of Leviathan Holding,
Leviathan Gas Pipeline Partners, L.P., or its successors and assigns so long as
they remain Affiliates of Leviathan Holding, and (ii) in the case of Tejas
Holding, Tejas Holding and its successors and assigns so long as they remain
Affiliates of Tejas Holding.

         "Lateral" means any natural gas pipeline, lateral, segment or extension
that directly connects or is proposed to connect directly to the Brutus
Gathering Facilities.

         "Lateral Opportunity" has the meaning given that term in Section 15.1.

         "Lateral Opportunity Notice" has the meaning given that term in Section
15.1.


                                        7
<PAGE>   13


         "Laws" means the laws, rules, regulations, decrees and orders of the
United States of America and all other governmental authorities having
jurisdiction, whether such Laws now exist or hereafter come into effect.

         "Lease and Platform Space Agreements" means __________________.

         "Lending Member" has the meaning given that term in Section 4.3(a)(ii).

         "Leviathan Gas Pipeline Companies" means Leviathan Gas Pipeline
Partners, L.P., and any direct or indirect Subsidiary thereof.

         "Leviathan Holding" means Moray Pipeline Company, L.L.C. and its
permitted successors and assigns.

         "Leviathan Holding Operating Cash Flow" means, with respect to all
taxable years or other periods of the Company preceding the calendar quarter in
which the determination is being made, an amount equal to (a) the aggregate
items of income and gain allocated to Leviathan Holding pursuant to Section 5.1
of this Agreement, minus (b) the aggregate items of loss and deduction allocated
to Leviathan Holding pursuant to Section 5.1 of this Agreement, plus (c) the
aggregate items of depreciation, amortization or other cost recovery deductions
taken into account as items of loss and allocated to Leviathan Holding pursuant
to Section 5.1 of this Agreement, minus (d) the aggregate principal repayments
made by the Company with respect to Company borrowings (other than any Company
borrowings to the extent the proceeds were directly distributed to one or more
Members) that would have been allocated to Leviathan Holding pursuant to Section
5.1 of this Agreement if such repayments were a deductible expense for federal
income tax purposes.

         "Liquidator" has the meaning given that term in Section 12.2.

         "Loss" or "Losses" means, subject to the limitations set forth in
Section 16.20, any actions, claims, settlements, judgments, demands, liens,
losses, damages, fines, penalties, interest, costs, expenses (including, without
limitation, expenses attributable to the defense of any actions or claims),
attorneys' fees and liabilities.

         "Majority Interest" means, subject to and in accordance with Section
7.5, the Membership Interest held by TOP and/or its Affiliates; provided,
however, that if the Membership Interest held by TOP and/or its Affiliates is
reduced for any reason below fifty percent (50%), (i) to the extent that there
are only two (2) Members, any Member having more than 50% of the Membership
Interests of both Members, and (ii) to the extent that there are more than two
(2) Members, any Member (together with its Affiliated Members) and at least one
other non-Affiliated Member having among them more than 50% of the Membership
Interests of all Members; provided, however, that with respect to clause (ii)
above, any single Member (together with its Affiliated Members) shall constitute
a "Majority Interest" only if such Member (together with its Affiliated Members)
owns at least 76% of the Membership Interest of all of the Members.

         "Member" means any Person executing this Agreement as of even date
herewith as a Member or any Person hereafter admitted to the Company as an
additional Member or


                                        8
<PAGE>   14


Substituted Member as provided in this Agreement, but does not include any
Person who has ceased to be a Member in the Company.

         "Member Parent" means the Person which directly Controls a Member,
regardless of who (if anybody) Controls (directly or indirectly) such Member
Parent.

         "Membership Interest" means, subject to and in accordance with Section
7.5, the ownership interest (on a percentage basis) of a Member in the Company,
including, without limitation, rights to distributions (liquidating or
otherwise), allocations, information, and to consent or approve, which ownership
interest is more particularly described and identified in Article III and
Exhibit A.

         "Minimum Gain Attributable to Member Nonrecourse Debt" means that
amount determined in accordance with the principles of Treasury Regulation
section 1.704 2(i)(3).

         "NGA" means the Natural Gas Act of 1938, as amended from time to time.

         "Net Asset Value" means (a) in the case of any Contributed Property,
the fair market value of such property reduced by any liabilities either assumed
by the Company upon such contribution or to which such property is subject when
contributed; provided, however, the fair market value of the Contributed
Property described on Exhibit A shall be deemed to be the Asset Value of such
Contributed Property set forth therein, and (b) in the case of any property
distributed to a Member or Transferee by the Company, the Company's Carrying
Value of such property at the time such property is distributed, reduced by any
indebtedness either assumed by such Member or Transferee upon such distribution
or to which such property is subject at the time of distribution as determined
under section 752 of the Code.

         "Net Income" means, for any taxable period, the excess, if any, of the
Company's items of income and gain for such taxable period over the Company's
items of loss and deduction for such taxable period. The items included in the
calculation of Net Income shall be determined in accordance with Section 4.5(b)
and shall not include any items specifically allocated under Sections 5.1(c)
through 5.1(k). For purposes of Sections 5.1(a) and (b), in determining whether
Net Income has been allocated to any Member for any previous taxable period, any
Unrealized Gain or Unrealized Loss allocated pursuant to Section 4.5(c)(i) and
(c)(ii) shall be treated as an item of gain or loss in computing Net Income.

         "Net Loss" means, for any taxable period, the excess, if any, of the
Company's items of loss and deduction for such taxable period over the Company's
items of income and gain for such taxable period. The items included in the
calculation of Net Loss shall be determined in accordance with Section 4.5(b)
and shall not include any items specifically allocated under Sections 5.1(c)
through 5.1(k). For purposes of Sections 5.1(a) and (b), in determining whether
Net Loss has been allocated to any Member for any previous taxable period, any
Unrealized Gain or Unrealized Loss allocated pursuant to Section 4.5(c)(i) and
(c)(ii) shall be treated as an item of gain or loss in computing Net Loss.

         "Non-Cash Consideration" has the meaning given that term in Section
3.5(d).


                                        9
<PAGE>   15


         "Nonrecourse Built-in Gain" means with respect to any Contributed
Properties or Adjusted Properties that are subject to a mortgage or negative
pledge securing a Nonrecourse Liability, the amount of any taxable gain that
would be allocated to the Members pursuant to Section 5.2(b)(i)(A),
5.2(b)(ii)(A) or 5.2(b)(iii) if such properties were disposed of in a taxable
transaction in full satisfaction of such liabilities and for no other
consideration.

         "Nonrecourse Debt" has the meaning set forth in Treasury Regulation
section 1.704-2(b)(4).

         "Nonrecourse Deductions" means any and all items of loss, deduction, or
expenditure (described in section 705(a)(2)(B) of the Code) that, in accordance
with the principles of Treasury Regulation section 1.704-2(b)(1), are
attributable to a Nonrecourse Liability.

         "Nonrecourse Liability" has the meaning assigned to such term in
Treasury Regulation section 1.704-2(b)(3).

         "Non-Transferring Members" has the meaning given that term in Section
3.5(d).

         "Obligation" has the meaning given that term in Section 4.3(a)(ii)(2).

         "Offer Notice" has the meaning given that term in Section 3.5(d).
         "Operating Agreement" means the Operating Agreement dated of even date
herewith between Tejas Holding and the Company.

         "Option Period" has the meaning given that term in Section 3.5(d)
herein.

         "Other Assets" has the meaning given that term in Section 3.5(d)(v).

         "Payout Amount" means an amount of money equal to 150% of the amount of
the actual out-of-pocket capital cost of the relevant Expansion Project;
provided, however that to the extent the Company elects to prepay all or any
portion of the unamortized portion of the principal amount of the Payout Amount
in accordance with Section 15.2(c), such Payout Amount shall be reduced as
described in Section 15.2(c).

         "Person" means any individual or entity, including, without limitation,
any corporation, limited liability company, partnership (general or limited),
joint venture, association, joint stock company, trust, unincorporated
organization or government (including any board, agency, political subdivision
or other body thereof).

         "Priority Sharing Ratios" means: (a) with respect to Leviathan Holding,
a fraction (expressed as a percentage), the numerator of which is the Leviathan
Holding Operating Cash Flow and the denominator of which is the Company
Operating Cash Flow; and (b) with respect to Tejas Holding, a fraction
(expressed as a percentage), the numerator of which is the Tejas Holding
Operating Cash Flow and the denominator of which is the Company Operating Cash
Flow; provided, however, that in no event shall the Priority Sharing Ratio of a
party be less than zero (0) or greater than one (1).


                                       10
<PAGE>   16


         "Proceeding" has the meaning given that term in Section 8.1.

         "Proposed Transaction" has the meaning given that term in Section
3.5(d)(i).

         "PUHCA" means the Public Utility Holding Company Act of 1935, as
amended, and the rules and regulations promulgated thereunder.

         "Recapture Income" means any gain recognized by the Company (computed
without regard to any adjustment required by section 734 or 743 of the Code)
upon the disposition of any property or asset of the Company, which gain is
characterized as ordinary income because it represents the recapture of
deductions previously taken with respect to such property or asset.

         "Record Date" means the date established by the Company for determining
(a) the identity of Members (or Transferees, if applicable) entitled to notice
of, or to vote at, any meeting of Members or entitled to vote by ballot or give
approval of Company action in writing without a meeting or entitled to exercise
rights in respect of any lawful action of Members or (b) the identity of Record
Holders entitled to receive any report or distribution.

         "Record Holder" means the Person in whose name a Membership Interest is
registered on the books of the Company as of the opening of business on a
particular Business Day.

         "Regulatory Allocations" has the meaning given that term in Section
5.1(k).

         "Rejected Lateral Opportunity" has the meaning given that term in
Section 15.1(c).

         "Required Interest" means, subject to and in accordance with Section
7.5, the applicable percentage of Membership Interests of all Members required
to authorize or approve a relevant act of the Company, including, without
limitation, a Majority Interest, a Super-Majority Interest or all Membership
Interests, as applicable.

         "Residual Gain" or "Residual Loss" means any item of gain or loss, as
the case may be, of the Company recognized for federal income tax purposes
resulting from a sale, exchange or other disposition of a Contributed Property
or Adjusted Property, to the extent such item of gain or loss is not allocated
pursuant to Section 5.2(b)(i)(A) or 5.2(b)(ii)(A), to eliminate Book Tax
Disparities.

         "SDDI" means Shell Deepwater Development Inc. and its successors and

          "Security Interest" means any security interest, lien, mortgage,
encumbrance, hypothecation, pledge, or other obligation, whether created by
operation of law or otherwise, created by any Person in any of its property or
rights as part of a bona fide arms-length securitization transaction.

         "Service" means the Internal Revenue Service.

         "Special Allocation IRR Date" means the first day of the calendar month
immediately following the calendar month in which the Company has achieved
(after a return of principal) a cumulative (for the period from project
inception through the date of achievement) nominal,


                                       11
<PAGE>   17


after-tax, internal rate of return (IRR) of thirteen percent (13%) per annum on
100% of the equity investment by the Company in connection with the Initial
Facilities as though such equity capital is not borrowed. Such IRR shall be
calculated based upon (a) 100% of the gross revenues and income of the Company
with respect to actual throughput quantities of gas utilizing the Initial
Facilities, regardless of whether such gas constitutes Dedicated Production; (b)
the operating costs and associated overhead expenses (including, without
limitation, costs associated with the lease of platform space from the Members
or their Affiliates), depreciation and tax rate used to calculate the gathering
rate pursuant to Section 6.1(a) of the gathering agreement referred to in part
(i) of the definition of Gathering Agreement; (c) the actual capital costs
incurred in constructing and placing into operation the Initial Facilities; and
(d) otherwise in accordance with customary financial practices. A sample
calculation of the determination of such IRR is shown in Exhibit D.

         "Special Revenue Allocation Amount" means the aggregate Dedicated
Property Revenues that are accrued or accruable by the Company prior to the
Special Allocation IRR Date.

         "Subject Interest" has the meaning given that term in Section 3.5(d).

         "Subsidiary" means, with respect to any relevant Person, any other
Person that is Controlled and more than 50%-owned (directly or indirectly) by
the relevant Person.

         "Substituted Member" means a Person who is admitted as a Member of the
Company at such time as such Person has complied with the requirements of
Section 3.4, in place of and with all the rights of a Transferor and who is
shown as a Member on the books and records of the Company.

         "Super-Majority Interest" means, subject to and in accordance with
Section 7.5, any Member (together with its Affiliated Members) and at least one
other non-Affiliated Member having among them more than 74% of the Membership
Interests of all Members.

         "Tax Matters Member" has the meaning given that term in Section 9.3.

         "Tejas Holding" means Tejas Offshore Pipeline, LLC, and its permitted
successors and assigns.

         "Tejas Holding Operating Cash Flow" means, with respect to all taxable
years or other periods of the Company preceding the calendar quarter in which
the determination is being made, an amount equal to (a) the aggregate items of
income and gain allocated to Tejas Holding pursuant to Section 5.1 of this
Agreement, minus (b) the aggregate items of loss and deduction allocated to
Tejas Holding pursuant to Section 5.1 of this Agreement, plus (c) the aggregate
items of depreciation, amortization or other cost recovery deductions taken into
account as items of loss or deduction and allocated to Tejas Holding pursuant to
Section 5.1 of this Agreement, minus (d) the aggregate principal repayments made
by the Company with respect to Company borrowings (other than any Company
borrowings to the extent the proceeds were directly distributed to the Members)
that would have been allocated to Section 5.1 to Tejas Holding pursuant to this
Agreement if such repayments were a deductible expense for federal income tax
purposes.


                                       12
<PAGE>   18


         "Tejas Pipeline Companies" means (a) Tejas Holding and (b) any direct
or indirect Subsidiary thereof.

         "TOP" means Tejas Offshore Pipeline, LLC, and any successor or assign
thereof which is an Affiliate of Shell Oil Company.

         "Transfer" or "Transferred" means, other than granting a Security
Interest, a voluntary or involuntary sale, assignment, transfer, conveyance,
exchange, bequest, devise, gift or any other alienation (in each case, with or
without consideration) of any rights, interests or obligations with respect to
all or any portion of any Membership Interest including, without limitation, a
Foreclosure Transfer. The term "Transfer" expressly excludes a Change in Member
Control.

         "Transferee" means a Person who receives all or part of a Member's
Membership Interest through a Transfer but who has not become a Substituted
Member.

         "Transferor" means a Member, Substituted Member or a predecessor
Transferor who Transfers a Membership Interest.

         "Transferring Member" has the meaning given that term in Section 3.5(d)
herein.

         "Treasury Regulation" shall have the meaning set forth in Section 3.7.

         "Unrealized Gain" attributable to any item of Company property means,
as of any date of determination, the excess, if any, of (a) the fair market
value of such property as of such date over (b) the Carrying Value of such
property as of such date (prior to any adjustment to be made pursuant to Section
4.5(c) as of such date). In determining such Unrealized Gain, the aggregate cash
amount and fair market value of a Company asset (including cash or cash
equivalents) shall be determined by the Company using such reasonable method of
valuation as it may adopt.

         "Unrealized Loss" attributable to any item of Company property means,
as of any date of determination, the excess, if any, of (a) the Carrying Value
of such property as of such date (prior to any adjustment to be made pursuant to
Section 4.5(c) as of such date) over (b) the fair market value of such property
as of such date. In determining such Unrealized Loss, the aggregate cash amount
and fair market value of a Company asset (including cash or cash equivalents)
shall be determined by the Company using such reasonable method of valuation as
it may adopt.

         "Voting Stock" means capital stock issued by a corporation, or
equivalent interests in any other Person, the holders of which are ordinarily,
in the absence of contingencies, entitled to vote for the election of directors
(or Persons with management authority performing similar functions) of such
Person.

         1.2. Other Terms. Other terms may be defined elsewhere in the text of
this Agreement and shall have the meaning so given. Whenever the context
requires, the singular shall include the plural, and the plural, shall include
the singular.

         1.3. Construction. Whenever the context requires, the gender of all
words used in this Agreement includes the masculine, feminine, and neuter. All
references to Articles and Sections


                                       13
<PAGE>   19


refer to articles and sections of this Agreement, and all references to Exhibits
are to exhibits attached hereto, each of which is incorporated herein for all
purposes. Articles and other titles or headings are for convenience only and
neither limit nor amplify the provisions of the Agreement itself, and all
references herein to articles, sections or subdivisions thereof shall refer to
the corresponding article, section or subdivision thereof of this Agreement
unless specific reference is made to such articles, sections or subdivisions of
another document or instrument.

                                   ARTICLE II.

                                  ORGANIZATION

         2.1. Formation. The Company has been organized as a Delaware limited
liability Company by the filing of a Certificate of Formation (the
"Certificate") with the Secretary of State of the State of Delaware pursuant to
the Act.

         2.2. Name. The name of the Company is Nemo Gathering Company, LLC, and
all Company business must be conducted in that name or such other names that
comply with applicable law as the Company may select from time to time.

         2.3. Principal Office in the United States; Other Offices. The
principal office of the Company in the United States shall be at 1301 McKinney,
Suite 700, Houston, Texas 77010, or at such other place as the Company may
designate from time to time, which need not be in the State of Delaware. The
Company may have such other offices as the Members may designate from time to
time.

         2.4. Purpose. The sole purpose of the Company is to construct, own,
operate and maintain the Brutus Gathering Facilities. Except for activities
related to such purposes, there are no other authorized business purposes of the
Company. The Company shall not engage in any activity or conduct inconsistent
with such purposes, including, without limitation, entering into any hedging,
futures, derivatives or similar transaction.

         2.5. Foreign Qualification. Prior to the Company's conducting business
in any jurisdiction other than Delaware, the Company shall comply, to the extent
procedures are available and those matters are reasonably within the control of
the Company, with all requirements necessary to qualify the Company as a foreign
limited liability company, and, if necessary, to keep the Company in good
standing, in that jurisdiction.

         2.6. Term. Subject to earlier termination pursuant to other provisions
of this Agreement (including those contained in Article XII), the existence of
the Company shall be perpetual.

         2.7. Mergers and Exchanges. Except as otherwise provided in this
Agreement or by applicable Laws, the Company may be a party to any (i) merger,
(ii) consolidation, (iii) exchange or acquisition or (iv) any other type of
reorganization.

         2.8. Business Opportunities--No Implied Duty or Obligation. Except to
the extent expressly provided in this Section 2.8 or Article XV, the Members and
their respective Affiliates may engage, directly or indirectly, without the
consent of the other Members or the Company, in


                                       14
<PAGE>   20


other business opportunities, transactions, ventures or other arrangements of
any nature or description, independently or with others, including without
limitation, business of a nature which may be competitive with or the same as or
similar to the business of the Company, regardless of the geographic location of
such business, and without any duty or obligation to account to the other
Members or the Company in connection therewith.

         2.9. Jurisdictional Status. It is the intent of the Parties that the
Brutus Gathering Facilities not become subject to the jurisdiction of the FERC
under the NGA. To this end, the Parties agree that the Brutus Gathering
Facilities shall be operated in such a manner that such facilities shall be
treated as exempt from regulation by the FERC under Section 1(b) of the NGA as a
gathering facility.

                                  ARTICLE III.

                       MEMBERSHIP INTERESTS AND TRANSFERS

         3.1. Initial Members. The initial Members of the Company are the
Persons executing this Agreement as of the date hereof in such capacity, each of
which is admitted to the Company as a Member effective contemporaneously with
the execution by such Person of this Agreement.

         3.2. Membership Interests. The Members agree that each Member's
ownership in the Company shall be that which is set forth in Exhibit A, as
amended from time to time in accordance with the terms of this Agreement.

         3.3. Representations and Warranties. Each Member hereby represents and
warrants to the Company and each other Member that (a) it is duly formed,
validly existing and (if applicable) in good standing under the Laws of the
state of its formation, and if required by Laws is duly qualified to do business
and (if applicable) is in good standing in the jurisdiction of its principal
place of business (if not formed therein); (b) that Member has full corporate,
limited liability company, partnership, trust, or other applicable power and
authority to execute and agree to this Agreement and to perform its obligations
hereunder and all necessary actions by the board of directors, shareholders,
managers, members, partners, trustees, beneficiaries, or other Persons necessary
for the due authorization, execution, delivery, and performance of this
Agreement by that Member have been duly taken; (c) that Member has duly executed
and delivered this Agreement and it is enforceable against such Member in
accordance with its terms, subject to bankruptcy, moratorium, insolvency and
other Laws generally affecting creditors' rights and general principles of
equity (whether applied in a proceeding in a court of law or equity); (d) that
Member's authorization, execution, delivery, and performance of this Agreement
does not conflict with any material obligation under any other material
agreement or arrangement to which that Member is a party or by which it is
bound; (e) that Member is an Eligible Citizen and will remain an Eligible
Citizen for so long as such Member remains a Member of the Company; (f) neither
that Member nor any of its Subsidiaries nor any Affiliate Controlled by such
Member nor, to such Member's Knowledge, any of such Member's Affiliates (other
than the aforementioned Affiliates) is a "holding company," a "subsidiary
company" of a "holding company" or of a "subsidiary company" of a "holding
company," or a "public utility" as each of such terms is defined in PUHCA
(unless such Member, Affiliate, Subsidiary, or Person has received an exemption
from registering under the PUHCA), and the ownership of a


                                       15
<PAGE>   21


Membership Interest by such Member does not, and, for so long as such Member
owns a Membership Interest, will not, cause the Company, its Subsidiaries or the
other Members to be subject to or adversely affected by PUHCA (including any
approval requirements arising under Section 9(a)(2) of PUHCA); and (g) it (i)
has been furnished with or given adequate access to such information about the
Company and the Membership Interest as the Member has requested, (ii) has made
its own independent inquiry and investigation into, and based thereon has formed
an independent judgment concerning, the Company and that Member's Membership
Interest therein, (iii) has adequate means of providing for its current needs
and possible individual contingencies and is able to bear the economic risks of
this investment and has a sufficient net worth to sustain a loss of its entire
investment in the Company in the event such loss should occur, (iv) has such
knowledge and experience in financial and business matters as to be capable of
evaluating the merits and risks of an investment in the Company, (v) is an
"accredited investor" within the meaning of "accredited investor" under
Regulation D of the Securities Act of 1933, as amended, and (vi) understands and
agrees that its Membership Interest shall not be sold, pledged, hypothecated or
otherwise transferred except in accordance with the terms of this Agreement and
pursuant to an applicable exemption from registration under the Securities Act
of 1933 and other applicable securities Laws. Upon the occurrence and during the
continuation of any event or condition which would cause a Member to be in
breach of a representation or warranty contained in Section 3.3(e) or (f), the
breaching Person shall be treated as a Transferee who has not become a
Substituted Member in accordance with the terms of Section 3.4(c).

         3.4. Restrictions on the Transfer of a Membership Interest. A Member
may Transfer all or part of a Membership Interest only in accordance with
applicable Laws and the provisions of this Agreement, including the following
provisions of this Section. Any purported Transfer in breach of the terms of
this Agreement shall be null and void ab initio, and the Company shall not
recognize any such prohibited Transfer.

               (a) A Membership Interest shall not be Transferred except
               pursuant to an applicable exemption from registration under the
               Securities Act of 1933 and other applicable securities Laws;

               (b) Except as otherwise provided in this Agreement or by
               applicable Laws, a Transfer of a Membership Interest shall be
               effective only to give the Transferee the right to receive the
               share of allocations and distributions to which the Transferor
               would otherwise be entitled, and no Transferee of a Membership
               Interest shall have the right to become a Substituted Member;

               (c) Unless and until a Transferee is admitted as a Substituted
               Member, (i) the Transferee shall have no right to exercise any of
               the powers, rights and privileges of a Member hereunder other
               than to receive its share of allocations and distributions
               pursuant to Section 3.4(b), and (ii) the Member who has
               Transferred all or any part of its Membership Interest to such
               Transferee shall cease to be a Member with respect to such
               Membership Interest upon Transfer of such Membership Interest and
               thereafter shall have no further powers, rights and privileges as
               a Member hereunder with respect to such Membership Interest (to
               the extent so Transferred), but shall, unless otherwise relieved
               of such obligations, remain liable for all obligations and duties
               as a Member with respect to such


                                       16
<PAGE>   22


               Membership Interest; provided, however, that if the Transferee
               reconveys such Membership Interest to the Transferor within ten
               days after the Transferor becomes aware that the Transferee will
               not become a Substituted Member, the Transferor shall once again
               be entitled to all of the powers, rights and privileges of a
               Member hereunder;

               (d) Subject to compliance with the terms and conditions of
               Section 3.5, a Transferee may become a Substituted Member if the
               Transferee agrees in writing to be bound by all the terms and
               conditions, as then in effect, of this Agreement;

               (e) At the time all of the provisions of Sections 3.4, 3.5 and
               3.6 are complied with, (i) a Substituted Member shall have all of
               the powers, rights, privileges, duties, obligations and
               liabilities of a Member, as provided in this Agreement and by
               applicable Laws to the extent of the Membership Interest so
               Transferred and (ii) the Member who Transferred the Membership
               Interest shall be relieved of all of the obligations and
               liabilities with respect to such Membership Interest; provided
               that such Member shall remain fully liable for all liabilities
               and obligations relating to such Membership Interest that accrued
               prior to such Transfer;

               (f) The Company may, in its reasonable discretion, charge a
               Member a reasonable fee to cover administrative expenses
               necessary to effect the Transfer of all or part of such Member's
               Membership Interest;

               (g) In the absence of the substitution (as provided herein) of a
               Transferee for a Transferor, any payment by the Company to the
               Transferor shall acquit the Company and the Members of all
               liability to any other Persons who may be interested in such
               payment by reason of a Transfer by such Member;

               (h) Notwithstanding any term or condition contained in Sections
               3.4, 3.5 and 3.6, any Person shall have the right to grant a
               Security Interest in any rights or obligations such Person may
               have arising from or related to this Agreement, the Company or
               any interest therein and make a Transfer in connection with any
               such Security Interest; provided that such Security Interest is
               not created in violation of Sections 3.4(a) and (i) of this
               Agreement and any other provisions contained in this Agreement
               and the Company is promptly notified in writing of such Security
               Interest; and

               (i) Notwithstanding any contrary provision contained in this
               Agreement, no Person shall Transfer to any other Person such
               Person's rights or obligations arising from or related to this
               Agreement, the Company or any interest therein if such Transfer
               would result in violation of the Act or any other Laws. Any such
               attempted Transfers are void ab initio.


                                       17
<PAGE>   23


         3.5. Transfer Restrictions.

               (a) Neither the Company nor any of the Members shall be bound or
               otherwise affected by any Transfer of Membership Interest of
               which such Person has not received notice pursuant to Section
               3.6.

               (b) Any Member's Membership Interest may be Transferred to an
               Affiliate of such Member; provided, that, if the Transferor's
               Membership Interest is subject to a guaranty, the guaranty shall
               apply to the Transferee and its Membership Interest.

               (c) Except with respect to a Foreclosure Transfer, a Member in
               Default shall not Transfer its Membership Interest.

               (d)

                    (i)  Except with respect to Transfers according to the terms
                         of Section 3.5(b), any Member who desires to Transfer
                         all or any portion of its Membership Interest
                         ("Transferring Member") to a ready, willing and able
                         transferee shall first offer to Transfer such
                         Membership Interest (the "Subject Interest") to the
                         other Members (the "Non-Transferring-Members") as a
                         group. Such offer shall be made by an irrevocable
                         written offer (the "Offer Notice") to Transfer all of
                         the Subject Interest which the Transferring Member
                         desires to Transfer and shall contain a complete
                         description of the transaction (the "Proposed
                         Transaction") in which the Transferring Member proposes
                         to Transfer the Subject Interest, including, without
                         limitation, the name of the ready, willing and able
                         transferee and the consideration specified. The
                         Non-Transferring Members shall have 45 days (the
                         "Option Period") after actual receipt of the Offer
                         Notice within which to advise the Transferring Member
                         whether or not they will acquire all of such Subject
                         Interest upon the terms and conditions contained in the
                         Offer Notice. The failure of a Non-Transferring Member
                         to respond prior to the expiration of the Option Period
                         shall be deemed to be an election by such
                         Non-Transferring Member to decline the offer. If,
                         within the Option Period, one or more Non-Transferring
                         Members elect to acquire such Subject Interest, then
                         such Non-Transferring Member or Members shall close
                         such transaction in accordance with Section 3.5(e) no
                         later than the later to occur of (i) the closing date
                         set forth in the Notice Offer or (ii) 60 days after the
                         last day of the Option Period.

                    (ii) If any Non-Transferring Member does not elect to
                         acquire its proportionate share of the Subject Interest
                         being transferred, the remaining Non-Transferring
                         Members shall have the right to acquire an equal and
                         undivided portion of the remaining Subject Interest
                         based on the relation of their Membership Interest to
                         the Membership Interest of all Non-Transferring Members
                         desiring to acquire a portion of such Membership
                         Interest. The right herein


                                       18
<PAGE>   24


                         created in favor of the Non-Transferring Members as a
                         group is an option to acquire all, or none, of the
                         Subject Interest offered for sale by the Transferring
                         Member. If the Non-Transferring Members as a group
                         decline to acquire all of the Subject Interest of the
                         Transferring Member in accordance with this Section
                         3.5(d), the Transferring Member may Transfer all of the
                         Subject Interest to the transferee named in the Offer
                         Notice delivered to the Non-Transferring Members upon
                         the terms described in such Offer Notice. If such
                         Transfer does not occur in accordance with the terms of
                         such Offer Notice, the Transferring Member shall again
                         be subject to the provisions of this Section 3.5(d).

                    (iii) Upon consummation of any such Transfer (whether to a
                         Member or any other Person), such transferee and its
                         Membership Interest shall automatically become a party
                         to and be bound by this Agreement and shall thereafter
                         have all of the rights and obligations of a Member
                         hereunder. Notwithstanding the foregoing, all Transfers
                         pursuant to this Section 3.5(d) must also comply with
                         and be governed by this Agreement, including any
                         restrictions on Transfers therein and on any Transferee
                         becoming a Substituted Member.

                    (iv) If any portion of the consideration set forth in the
                         Offer Notice is to be paid in a form other than cash or
                         cash equivalents (including real or personal property,
                         promissory notes, securities, contractual benefits,
                         assumption of liabilities or anything else of value)
                         ("Non-Cash Consideration"), the Transferring Member
                         shall state in its Offer Notice its determination of
                         the aggregate fair market value of such Non-Cash
                         Consideration (which, in the case of marketable
                         securities, shall be the market price of such
                         securities). If a majority in interest of the
                         Non-Transferring Members (calculated without reference
                         to the Membership Interest of the Transferring Member)
                         disagree with such determination, they shall notify the
                         Transferring Member of such disagreement within 5
                         Business Days of receiving the Offer Notice. If such
                         dispute is not resolved within 5 Business Days after
                         such notice, any Member may submit such dispute to
                         binding arbitration by delivering an arbitration notice
                         to the other Members and the Company. The Member
                         initiating arbitration shall also simultaneously file
                         duplicate copies of its notice of arbitration with the
                         regional office of the CPR Institute for Dispute
                         Resolution (the "CPR Institute") covering Houston,
                         Texas, together with the appropriate fee as provided in
                         the CPR Institute's administrative fee schedule. The
                         notice of arbitration shall contain a brief description
                         of the nature of the dispute to be arbitrated. With
                         respect to any such arbitration, the Members hereby
                         agree that: (i) the single arbitrator shall be an
                         appraiser or investment banking firm having expertise
                         in the


                                       19
<PAGE>   25


                         valuation of the types of assets represented by the
                         Non-Cash Consideration; (ii) the arbitration
                         proceedings shall be held in Houston, Texas at such
                         location selected by the arbitrator; (iii) all
                         arbitration proceedings under this Section 3.5(d)(iv)
                         shall be conducted in accordance with the Commercial
                         Arbitration Rules of the CPR Institute, as then amended
                         and in effect; and such rules shall be interpreted and
                         applied and questions regarding the arbitration process
                         not resolved under such rules shall be determined in
                         accordance with the Uniform Arbitration Act, as enacted
                         in the State of Delaware; provided, however, that the
                         arbitrator shall resolve such dispute with respect to
                         the application and/or interpretation of such rule or
                         rules within ten days from the day a Member submitted
                         its notice of arbitration to the other Members, the
                         Company and the CPR Institute; (iv) within 5 Business
                         Days following the receipt of the initial arbitration
                         notice by the Company, the Transferring Member and a
                         designee of the majority in interest of the
                         Non-Transferring Members shall each submit to each of
                         the other Members, the Company and the CPR Institute a
                         response in which it proposes a single determination of
                         the fair market value; and (v) the arbitrator shall be
                         required to select either the determination of the
                         Transferring Member or the determination of the
                         designee of such majority in interest. The
                         consideration shall then be an amount of money, payable
                         in cash, equal to the total consideration stated in the
                         Offer Notice, including the fair market value of any
                         Non-Cash Consideration as determined in accordance with
                         this Section 3.5(d).

                    (v)  If the Proposed Transaction (or any other transaction
                         that is contingent upon the Proposed Transaction,
                         and/or any other transaction on which the Proposed
                         Transaction is contingent), contemplates the transfer
                         of any asset, property, interest or right other than
                         the Subject Interest (the "Other Assets") to the
                         proposed transferee or its Affiliate, then the
                         Transferring Member shall disclose in its Offer Notice
                         (A) the Subject Interest, (B) the Other Assets, (C) the
                         aggregate fair market value of cash, cash equivalents
                         and Non-Cash Consideration that is to be paid in
                         exchange for the Subject Interest and the Other Assets
                         and (D) the Transferor's determination of the
                         percentage of such aggregate fair market value of cash,
                         cash equivalents and Non-Cash Consideration to be paid
                         that is attributable to the Subject Interest, based on
                         the relationship of the value of the Subject Interest
                         to the value of the Subject Interest plus the Other
                         Assets. If a majority in interest of the
                         Non-Transferring Members (calculated without reference
                         to the Membership Interest of the Transferring Member)
                         disagree with such determination of the values in
                         clauses (C) or (D) above, they shall notify the
                         Transferring Member of such disagreement within 5
                         Business Days of receiving the Offer


                                       20
<PAGE>   26


                         Notice. If such dispute is not resolved within 5
                         Business Days after such notice, any Member may submit
                         such dispute to binding arbitration by delivering an
                         arbitration notice to the other Members and the
                         Company. The Member initiating arbitration shall also
                         simultaneously file duplicate copies of its notice of
                         arbitration with the regional office of the CPR
                         Institute covering Houston, Texas, together with the
                         appropriate fee as provided in the CPR Institute's
                         administrative fee schedule. The notice of arbitration
                         shall contain a brief description of the nature of the
                         dispute to be arbitrated. With respect to any such
                         arbitration, the Members hereby agree that: (A) the
                         single arbitrator shall be an appraiser or investment
                         banking firm having expertise in the valuation of the
                         types of assets represented by the Subject Interest,
                         the Other Assets and the Non-Cash Consideration; (B)
                         the arbitration proceedings shall be held in Houston,
                         Texas at such location selected by the arbitrator; (C)
                         all arbitration proceedings under this Section
                         3.5(d)(v) shall be conducted in accordance with the
                         Commercial Arbitration Rules of the CPR Institute, as
                         then amended and in effect; and such rules shall be
                         interpreted and applied and questions regarding the
                         arbitration process not resolved under such rules shall
                         be determined in accordance with the Uniform
                         Arbitration Act, as enacted in the State of Delaware;
                         provided, however, that the arbitrator shall resolve
                         such dispute with respect to the application and/or
                         interpretation of such rule or rules within 10 days
                         from the day a member submitted its notice of
                         arbitration to the other Members, the Company and the
                         CPR Institute; (D) within 5 Business Days following the
                         receipt of the initial arbitration notice by the
                         Company, the Transferring Member and a designee of the
                         majority in interest of the Non-Transferring Members
                         shall each submit to each of the other Members, the
                         Company and the CPR Institute a response in which it
                         proposes a single determination of (Y) the aggregate
                         fair market value of cash, cash equivalents and
                         Non-Cash Consideration that is to be paid in exchange
                         for the Subject Interest and the Other Assets and (Z)
                         the percentage of such aggregate fair market value of
                         cash, cash equivalents and Non-Cash Consideration to be
                         paid that is attributable to the Subject Interest,
                         based on the relationship of the value of the Subject
                         Interest to the value of the Subject Interest plus the
                         Other Assets; and (E) the arbitrator shall be required
                         to select, with respect to each of clauses (Y) and (Z),
                         individually, either the determination of the
                         Transferring Member or the determination of the
                         designee of such majority in interest. The
                         consideration shall then be an amount of money, payable
                         in cash, equal to the percentage of aggregate fair
                         market value of cash, cash equivalents and Non-Cash
                         Consideration to be paid that is attributable to the


                                       21
<PAGE>   27


                         Subject Interest, as determined in accordance with this
                         Section 3.5(d)(v).

               (e) At the closing of the Transfer of a Membership Interest
               pursuant to this Agreement, (i) the transferee shall deliver to
               the Transferor the full consideration agreed upon and (ii) the
               Transferor shall transfer its Membership Interest to the
               transferee free and clear of any and all encumbrances, other than
               those created by this Agreement or any loan documents evidencing
               indebtedness of the Company, for borrowed money. Any Membership
               Interest transfer or similar taxes involved in such sale shall be
               paid by the Transferor, and the Transferor shall provide the
               transferee with such evidence of the Transferor's authority to
               Transfer hereunder and such tax lien waivers and similar
               instruments as the Transferee may reasonably request.

               (f) If any governmental consent or approval is required with
               respect to any Transfer, the transferee shall have a reasonable
               amount of time (not to exceed 60 days from the date upon which
               such Transfer would have been otherwise consummated in accordance
               with the terms of this Agreement) to obtain such consent or
               approval. All Members shall use reasonable, good faith efforts to
               cooperate with the transferee attempting to obtain, and to assist
               in timely obtaining, such consent or approval; provided that no
               Member shall be required to incur any out-of-pocket costs in
               connection with such cooperation and assistance. After the
               expiration of such waiting period, such transferee shall forfeit
               its rights to acquire the Subject Interest with respect to such
               specific transaction; provided, however, that such forfeiture
               shall not limit or otherwise affect the forfeiting transferee's
               rights with respect to any subsequent proposed Transfer.

               (g) No Transfer of a Membership Interest shall effect a release
               of the Transferor from any liabilities or obligations to the
               Company or the other Members that accrued prior to the Transfer.

         3.6. Documentation; Validity of Transfer. The Company may not recognize
for any purpose any purported Transfer of all or any part of a Membership
Interest unless and until the applicable provisions of Sections 3.4 and 3.5 have
been satisfied and the Company has received, on behalf of the Company, a
document in a form acceptable to the Company executed by both the Transferor (or
if the Transfer is on account of the death, incapacity, or liquidation of the
Member, its representative) and the Transferee. Such document shall (i) include
the notice address of any Person to be admitted to the Company as a Substituted
Member and such Person's agreement to be bound by this Agreement with respect to
the Membership Interest or part thereof being obtained, (ii) set forth the
Membership Interest after the Transfer of the Transferor and the Person to which
the Membership Interest or part thereof is Transferred (which together must
total the Membership Interest of the Transferor before the Transfer), (iii)
contain a representation and warranty that the Transfer was made in accordance
with all applicable Laws (including state and federal securities Laws) and the
terms and conditions of this Agreement, and (iv) if the Person to which the
Membership Interest or part thereof is Transferred is to be admitted to the
Company as a Substituted Member, its representation and warranty that the
representations and warranties in Section 3.3 are true and correct with respect
to such Person. Each Transfer and, if


                                       22
<PAGE>   28



applicable, admission complying with the provisions of this Section 3.6 and
Sections 3.4 and 3.5 is effective against the Company as of the first business
day of the calendar month immediately succeeding the month in which (y) the
Company receives the document required by this Section 3.6 reflecting such
Transfer, and (z) the other requirements of Sections 3.4 and 3.5 have been met.

         3.7. Possible Additional Restrictions on Transfer. Notwithstanding
anything to the contrary contained in this Agreement, in the event of (i) the
enactment (or imminent enactment) of any legislation, (ii) the publication of
any temporary or final regulation by the Treasury Department ("Treasury
Regulation"), (iii) any ruling by the Service or (iv) any judicial decision that
in any such case, in the opinion of counsel to the Company, would result in the
taxation of the Company for federal income tax purposes as a corporation or
would otherwise subject the Company to being taxed as an entity for federal
income tax purposes, this Agreement shall be deemed to impose such restrictions
on the Transfer of a Membership Interest as may be required, in the opinion of
counsel to the Company, to prevent the Company from being taxed as a corporation
or otherwise being taxed as an entity for federal income tax purposes, and the
Members thereafter shall amend this Agreement as necessary or appropriate to
impose such restrictions.

         3.8. Additional Membership Interests. Additional Persons may be
admitted to the Company as Members, and Membership Interests may be created and
issued to those Persons and to existing Members upon a unanimous vote by the
Members and subject to the terms and conditions of this Agreement. Such
admission must comply with any additional terms and conditions the Members may
in their sole discretion determine at the time of admission. A document, in a
form acceptable to the Company, shall specify the terms of admission or issuance
and shall include, among other things, the Membership Interest applicable
thereto. Any such admission of a new Member also must comply with the provisions
of Section 3.4(d). The provisions of this Section 3.8 shall not apply to
Transfers of Membership Interests.

         3.9. [RESERVED]

         3.10. Information.

               (a) In addition to the other rights specifically set forth in
               this Agreement, each Member is entitled to all information to
               which that Member is entitled to have access pursuant to the Act
               under the circumstances and subject to the conditions therein
               stated.

               (b) The Members acknowledge that, from time to time, they may
               receive information from or regarding the Company, its customers
               or any other Member or its Affiliates in the nature of trade
               secrets or secret or proprietary information or information that
               is otherwise confidential, the release of which may be damaging
               to the Company or the Member or its Affiliates, as applicable, or
               Persons with which they do business. Each Member shall hold in
               strict confidence any such information it receives and may not
               disclose such information to any Person other than another
               Member, except for disclosures (i) to comply with any Laws, (ii)
               under compulsion of judicial process, (iii) to


                                       23
<PAGE>   29


               Affiliates, advisers or representatives of the Member or Persons
               to which that Member's Membership Interest may be Transferred as
               permitted by this Agreement, but only if the recipients of such
               information have agreed to be bound by the provisions of this
               Section 3.10(b), (iv) of information that a Member also has
               received from a source independent of the Company and that such
               Member reasonably believes such source obtained such information
               without breach of any obligation of confidentiality, (v) of
               information obtained prior to the formation of the Company,
               provided that this clause (v) shall not relieve any Member or any
               of its Affiliates from any obligations it may have to any other
               Member or any of its Affiliates under any existing
               confidentiality agreement, (vi) to lenders, accountants and other
               representatives of the disclosing Member with a need to know such
               information, provided that the disclosing Member shall be
               responsible for such representatives' use and disclosure of any
               such information, or (vii) of public information. The Members
               acknowledge that a breach of the provisions of this Section
               3.10(b) may cause irreparable injury to the Company or another
               Member for which monetary damages are inadequate, difficult to
               compute, or both. Accordingly, the Members agree that the
               provisions of this Section 3.10(b) may be enforced by injunctive
               action or specific performance.

               (c) The Members acknowledge that, from time to time, the Company
               may need information from any or all of such Members for various
               reasons, including, without limitation, compliance with various
               federal and state regulations. Each Member shall provide to the
               Company all information reasonably requested by the Company
               within a reasonable amount of time from the date such Member
               receives such request; provided, however, that no Member shall be
               obligated to provide such information to the Company to the
               extent such disclosure (i) could reasonably be expected to result
               in the breach or violation of any contractual obligation (if a
               waiver of such restriction cannot reasonably be obtained) or Law
               or (ii) involves secret, confidential or proprietary information.

         3.11. Liability to Third Parties. Except as required by the Act, no
Member shall be liable to any Person (including any third party or to another
Member) (i) as the result of any act or omission of another Member or (ii) for
Company losses, liabilities or obligations (except as otherwise expressly agreed
to in writing by such Member).

         3.12. Resignation. Each Member hereby covenants and agrees that it will
not resign from the Company as a Member without the express written consent of
all other Members, which consent may be granted or withheld in each Members sole
discretion.

         3.13. Lack of Member Authority. No Member has the authority or power to
act as agent for or on behalf of the Company, do any act that would be binding
on the Company, or incur any expenditures on behalf of the Company, unless
expressly authorized to do so in writing by the Company.


                                       24
<PAGE>   30


                                   ARTICLE IV.

                              CAPITAL CONTRIBUTIONS

         4.1. Initial Capital Contributions. The Members shall make the
following Capital Contributions as further described in Exhibit A (the "Initial
Capital Contributions"):

               (a) Contributions by each Member of amounts equal to the cash
               paid by such Member on behalf of the Company for certain costs
               and expenses related to the formation of the Company and incurred
               by such Member prior to the date hereof, which amounts are set
               forth on Exhibit A; and

               (b) Contributions by each Member of cash in amounts equal to its
               proportionate Membership Interest (on the date such contribution
               accrues) share of 100% of all amounts incurred to design,
               construct, install and place in service the Initial Facilities.
               Such contributions shall be made as necessary to allow the
               Company to timely pay such obligations as they become due. If a
               Majority Interest determines from time to time in good faith that
               additional Initial Capital Contributions may be necessary and in
               the best interest of the Company to timely complete such work the
               Company expects to be obligated to pay on or about a certain
               date, then TOP or another designated Member shall send written
               notice to the other Members specifying (i) the aggregate amount
               of the additional Initial Capital Contributions reasonably and in
               good faith deemed necessary by such Member and each Member's
               allocable share thereof and (ii) the date by which such
               additional Capital Contributions shall be made to the Company by
               each Member (which date shall not be less than ten (10) Business
               Days from the date on which the notice is sent). Each Member
               shall thereafter contribute cash to the Company in an amount
               equal to such Member's Membership Interest share of the amount of
               the additional Initial Capital Contribution on or before the date
               specified in such notice. All Initial Capital Contributions
               consisting of cash shall be held in an account until such time as
               such funds are used to fund the construction costs except to the
               extent that all of the Members (notwithstanding any provision to
               the contrary herein) agree that the applicable portion of any
               such Initial Capital Contribution is no longer needed to finance
               such construction costs or the operations of the Company.

         4.2. Subsequent Contributions. Unless unanimously agreed to in writing
by the Members, no Member shall be required to make any Capital Contributions
other than the Initial Capital Contributions as contemplated by Section 4.1.

         4.3. Failure to Contribute.

               (a) If a Member does not contribute by the time required all or
               any portion of a Capital Contribution such Member (the
               "Delinquent Member") is required to make as provided in this
               Agreement, any one or more non-Delinquent Members may advance the
               entire amount of the Delinquent Member's Capital Contribution
               that is in Default, with each non-Delinquent Member electing to
               participate


                                       25
<PAGE>   31


               making its share of such advance in proportion to its Membership
               Interest or in such other percentages as the participating
               Members may agree. Each non-Delinquent Member who makes such an
               advance on behalf of a Delinquent Member shall have the right to
               designate the extent to which such advance will (x) constitute a
               loan to the Delinquent Member and/or (y) result in an immediate
               adjustment of the Membership Interests of the Delinquent Member
               and the non-Delinquent Member making such election; provided,
               however, that if the advancing non-Delinquent Member does not
               notify the Company of its election to have all, or any portion of
               such advance treated as a loan to the Delinquent Member, in
               writing, at the time the advance is made then such advance shall
               automatically result in an immediate adjustment of the Membership
               Interests:

                    (i)  To the extent one or more non-Delinquent Members does
                         not elect to have an advance pursuant to Section 4.3(a)
                         treated as a loan to the Delinquent Member, or
                         affirmatively elects to have such advance result in an
                         adjustment of the Membership Interests, the Company
                         shall automatically adjust the Membership Interest for
                         each Member to equal the percentage obtained by
                         dividing (A) the Capital Account of such Member
                         (including any Capital Contribution made by such Member
                         under this Section by (B) the aggregate Capital
                         Accounts of all Members (including all Capital
                         Contributions made under this Section). Upon the
                         adjustment of the Membership Interests in the manner
                         set forth in the preceding sentence, Exhibit A shall be
                         deemed to be amended to reflect such adjusted
                         Membership Interests. Notwithstanding the foregoing,
                         the Delinquent Member shall have the right to
                         re-acquire the interest in question from the advancing
                         non-Delinquent Member within 30 days following the date
                         on which such Membership Interest adjustment is made by
                         paying the entire amount advanced by such
                         non-Delinquent Member in return for such adjustment,
                         plus twelve percent (12%) per annum.

                    (ii) To the extent one or more non-Delinquent Members (the
                         "Lending Member," whether one or more) does elect to
                         have an advance pursuant to Section 4.3(a) constitute a
                         loan to the Delinquent Member, such advance shall have
                         the following results:

                         1.   the sum advanced shall constitute a loan from the
                              Lending Member to the Delinquent Member and a
                              Capital Contribution of that sum to the Company by
                              the Delinquent Member pursuant to the applicable
                              provisions of this Agreement,

                         2.   the principal balance of the loan and all accrued
                              unpaid interest thereon (collectively, the
                              "Obligation") shall be due and payable in whole on
                              the tenth Business Day after the day written
                              demand requesting payment of the Obligation


                                       26
<PAGE>   32


                              is made by the Lending Member to the Delinquent
                              Member; provided, however that the Delinquent
                              Member may prepay the Obligation in whole or in
                              part at any time prior to the date due.

                         3.   the amount lent shall bear interest at the Default
                              Interest Rate from the date on which the advance
                              is deemed made until the date on which the loan,
                              together with all interest accrued thereon and all
                              costs and expenses associated therewith ("Costs"),
                              is repaid to the Lending Member,

                         4.   all distributions from the Company that otherwise
                              would be made to the Delinquent Member (whether
                              before or after dissolution of the Company)
                              instead shall be paid to the Lending Member until
                              the Obligation and any Costs have been paid in
                              full to the Lending Member (with payments being
                              applied first to accrued and unpaid interest,
                              second to Costs, and finally to principal),

                         5.   each Delinquent Member grants to the other Lending
                              Members a Security Interest to secure the
                              repayment of the Lending Members' advances made on
                              behalf of a Delinquent Member in connection with
                              the Obligation,

                         6.   the Lending Member shall have the right, in
                              addition to the other rights and remedies granted
                              to it pursuant to this Agreement or available to
                              it at law or in equity, to take any action
                              (including, without limitation, court proceedings
                              and exercising the rights of a secured party under
                              the Uniform Commercial Code of the State of Texas)
                              that the Lending Member may deem appropriate to
                              obtain payment from the Delinquent Member of the
                              Obligation and all Costs; and

                         7.   initially, a loan by any Member to another Member
                              as contemplated by this Section 4.3(a)(ii) shall
                              not be considered a Capital Contribution by the
                              Lending Member and shall not increase the Capital
                              Account balance of the Lending Member.
                              Notwithstanding the foregoing, in the event the
                              principal and interest of any such loan have not
                              been repaid within one year from the date of the
                              loan, the Lending Member, at any time thereafter
                              by giving written notice to the Company, may elect
                              to have the unpaid principal and interest balance
                              of such loan transferred to and increase such
                              Lending Member's Capital Account with a
                              corresponding decrease in the Capital Account of
                              the Member on whose behalf such loan was made.
                              Upon such transfer, the loan shall be treated as a
                              Capital Contribution


                                       27
<PAGE>   33


                              and the Membership Interest for each Member shall
                              be automatically adjusted to equal the percentage
                              obtained by dividing (A) the Capital Account of
                              such Member (including any Capital Contribution
                              made on behalf of another Member) by (B) the
                              aggregate Capital Accounts of all Members
                              (including all Capital Contributions made on
                              behalf of other Members). Upon the adjustment of
                              the Membership Interests in the manner set forth
                              in the preceding sentence, Exhibit A shall be
                              deemed to be amended to reflect such adjusted
                              Membership Interests.

               (b) If the non-Delinquent Members do not exercise the rights
               granted by Section 4.3(a) within 14 days after the Delinquent
               Member fails to make its Capital Contribution when due, then the
               Company, by a vote of a majority in interest of the
               non-Delinquent Members, shall have the right to exercise the
               following remedies:

                    (i)  the Company may at any time take such action
                         (including, without limitation, court proceedings) as
                         the Company may deem appropriate to obtain payment by
                         the Delinquent Member of the portion of the Delinquent
                         Member's Capital Contribution that is in Default, along
                         with all Costs and expenses associated with the
                         collection of such Delinquent Member's Capital
                         Contribution; and

                    (ii) the Company may at any time exercise any other rights
                         and remedies available at law or in equity.

         4.4. Return of Contributions. A Member is not entitled (i) to the
return of any part of any Capital Contributions other than any preferential or
disproportionate distributions to the extent such distributions are expressly
required to be returned by this Agreement or (ii) to be paid interest in respect
of either its Capital Account or its Capital Contributions. An unrepaid Capital
Contribution is not a liability of the Company or of any Member. A Member is not
required to contribute or to lend any cash or property to the Company to enable
the Company to return any other Member's Capital Contributions.

         4.5. Capital Accounts. A separate capital account ("Capital Account")
shall be established and maintained for each Member in accordance with the rules
of Treasury Regulation section 1.704-1(b)(2)(iv) and the following terms and
conditions:

               INCREASES AND DECREASES

               (a) Each Member's Capital Account shall be (i) increased by (A)
               the amount of cash or cash equivalents contributed by that Member
               to the Company as capital, (B) the Net Asset Value of property
               contributed by that Member to the Company as capital, (C) the
               amount of any loans transferred by such Member to its Capital
               Account pursuant to Section 4.3(a)(ii)(7) (contributions
               contemplated by subparagraphs (A) and (B) shall be referred to as
               "Capital Contributions"), and


                                       28
<PAGE>   34


               (D) allocations to that Member of Company income and gain (or
               items thereof), including, without limitation, income and gain
               exempt from tax and income and gain described in Treasury
               Regulation section 1.704-1(b)(2)(iv)(g), but excluding income and
               gain described in Treasury Regulation section 1.704-1(b)(4)(i);
               and (ii) shall be decreased by (A) the amount of cash or cash
               equivalents distributed to that Member by the Company, (B) the
               Net Asset Value of property distributed to that Member by the
               Company, and (C) allocations of Company losses and deductions (or
               items thereof), including losses and deductions described in
               Treasury Regulation section 1.704-1(b)(2)(iv)(g) (but excluding
               losses or deductions described in Treasury Regulation section
               1.704-1(b)(4)(i) or (iii));

               METHOD FOR DETERMINING INCOME, GAIN OR LOSS AND DEDUCTIONS

               (b) For purposes of computing the amount of any item of income,
               gain, loss or deduction to be reflected in the Members' Capital
               Accounts, the determination, recognition and classification of
               any such item shall be the same as its determination, recognition
               and classification for federal income tax purposes (including,
               without limitation, any method of depreciation, cost recovery or
               amortization used for that purpose), provided that:

                    (i)  All fees and other expenses incurred by the Company to
                         promote the sale of (or to sell) any interest that can
                         neither be deducted nor amortized under section 709 of
                         the Code, if any, shall, for purposes of Capital
                         Account maintenance, be treated as an item of deduction
                         at the time such fees and other expenses are incurred
                         and shall be allocated among the Members pursuant to
                         Sections 5.1 and 5.2;

                    (ii) Except as otherwise provided in Treasury Regulation
                         section 1.704-1(b)(2)(iv)(m), the computation of all
                         items of income, gain, loss and deduction shall be made
                         without regard to any election under section 754 of the
                         Code which may be made by the Company and, as to those
                         items described in section 705(a)(1)(B) or 705(a)(2)(B)
                         of the Code, without regard to the fact that such items
                         are not includeable in gross income or are neither
                         currently deductible nor capitalized for federal income
                         tax purposes;

                   (iii) Any income, gain or loss attributable to the taxable
                         disposition of any Company property shall be determined
                         as if the adjusted basis of such property as of such
                         date of disposition were equal in amount to the
                         Company's Carrying Value with respect to such property
                         as of such date;

                    (iv) In accordance with the requirements of section 704(b)
                         of the Code, any deductions for depreciation, cost
                         recovery or amortization attributable to any
                         Contributed Property shall be determined as if the
                         adjusted basis of such property on the date it was
                         acquired by


                                       29
<PAGE>   35


                         the Company was equal to the Asset Value of such
                         property on the date it was acquired by the Company.
                         Upon an adjustment pursuant to Section 4.5(c) to the
                         Carrying Value of any Company property subject to
                         depreciation, cost recovery or amortization, any
                         further deductions for such depreciation, cost recovery
                         or amortization attributable to such property shall be
                         determined (A) as if the adjusted basis of such
                         property were equal to the Carrying Value of such
                         property immediately following such adjustment and (B)
                         using a rate of depreciation, cost recovery or
                         amortization derived from the same method and useful
                         life (or, if applicable, the remaining useful life) as
                         is applied for federal income tax purposes; provided,
                         however, that if the asset has a zero adjusted basis
                         for federal income tax purposes, depreciation, cost
                         recovery or amortization deductions shall be determined
                         using any reasonable method that the Company may adopt;
                         and

                    (v)  any income of the Company that is exempt from federal
                         income tax and not otherwise taken into account in
                         computing Net Income or Net Loss shall be added to such
                         taxable income or loss.

          IMPACT OF AND ADJUSTMENTS FOR SUCCESSION IN INTERESTS

          (c) A Transferee shall succeed to the Capital Account of the
          Transferor relating to the Membership Interest so Transferred.

          ADDITIONAL MEMBERSHIP INTERESTS

               (i)  Consistent with the provisions of Treasury Regulation
                    section 1.704-1(b)(2)(iv)(f), on an issuance of additional
                    Membership Interests for cash or Contributed Property or
                    upon an adjustment of the Members' Capital Accounts pursuant
                    to Section 4.3, the Capital Accounts of all Members and the
                    Carrying Value of each Company property immediately prior to
                    such issuance or adjustment shall be adjusted upward or
                    downward to reflect any Unrealized Gain or Unrealized Loss
                    attributable to such Company property, as if such Unrealized
                    Gain or Unrealized Loss had been recognized on an actual
                    sale of each such property immediately prior to such
                    issuance or adjustment and had been allocated to the Members
                    at such time pursuant to Section 5.1.

          ADJUSTMENTS PRIOR TO A DISTRIBUTION

               (ii) In accordance with Treasury Regulation section
                    1.704-1(b)(2)(iv)(f), immediately prior to any distribution
                    to a Member of any Company property (other than a
                    distribution of cash or cash equivalents that are not in
                    redemption or retirement of a Membership Interest), the
                    Capital Accounts of all Members and


                                       30
<PAGE>   36


                    the Carrying Value of each Company property shall be
                    adjusted upward or downward to reflect any Unrealized Gain
                    or Unrealized Loss attributable to such Company property, as
                    if such Unrealized Gain or Unrealized Loss had been
                    recognized in a sale of such property immediately prior to
                    such distribution for an amount equal to its fair market
                    value (which shall be determined by the Company using any
                    valuation method it deems reasonable under the
                    circumstances), and had been allocated to the Members at
                    such time, pursuant to Section 5.1.

                                   ARTICLE V.

                          ALLOCATIONS AND DISTRIBUTIONS

         5.1. Allocations for Capital Account Purposes. For purposes of
maintaining the Capital Accounts and in determining the rights of the Members
among themselves, the Company's items of income, gain, loss and deduction
(computed in accordance with Section 4.5(b)) shall be allocated among the
Members for each taxable year (or portion thereof) as provided herein below.

               (a) Net Income. All items of income, gain, loss and deduction
               taken into account in computing Net Income for such taxable
               period, determined after any special allocations required by
               Section 5.1(c) through Section 5.1(k) have first been made, shall
               be allocated to each of the Members in proportion to their
               respective Membership Interests.

               (b) Net Loss. All items of income, gain, loss and deduction taken
               into account in computing Net Loss for such taxable period,
               determined after any special allocations required by Section
               5.1(c) through Section 5.1(k) have first been made, shall be
               allocated to each of the Members in proportion to their
               respective Membership Interests.

               (c) Nonrecourse Liabilities. For purposes of Treasury Regulation
               section 1.752-3(a)(3), the Members agree that Nonrecourse
               Liabilities of the Company in excess of the sum of (A) the amount
               of Company Minimum Gain and (B) the total amount of Nonrecourse
               Built-in Gain shall be allocated among the Members in accordance
               with their respective Membership Interests.

               (d) Company Minimum Gain Chargeback. Notwithstanding the other
               provisions of this Section 5.1, except as provided in Treasury
               Regulation section 1.704-2(f)(2) through (5), if there is a net
               decrease in Company Minimum Gain during such taxable period, each
               Member shall be allocated items of Company income and gain for
               such period (and, if necessary, subsequent periods) in the manner
               and amounts provided in Treasury Regulation sections
               1.704-2(f)(6) and (g)(2) and section 1.704-2(j)(2)(i), or any
               successor provisions. For purposes of this Section 5.1(d), each
               Member's Adjusted Capital Account balance shall be determined,
               and the allocation of income or gain required hereunder shall be


                                       31
<PAGE>   37


               effected, prior to the application of any other allocations
               pursuant to this Section 5.1 with respect to such taxable period
               (other than an allocation pursuant to Section 5.1(h) or (i)).

               (e) Chargeback of Minimum Gain Attributable to Member Nonrecourse
               Debt. Notwithstanding the other provisions of this Section 5.1
               (other than Section 5.1(d), except as provided in Treasury
               Regulation section 1.704-2(i)(4)), if there is a net decrease in
               Minimum Gain Attributable to Member Nonrecourse Debt during such
               taxable period, any Member with a share of Minimum Gain
               Attributable to Member Nonrecourse Debt at the beginning of such
               taxable period shall be allocated items of Company income and
               gain for such period (and, if necessary, subsequent periods) in
               the manner and amounts provided in Treasury Regulation sections
               1.704-2(i)(4) and 1.704-2(j)(2)(ii), or any successor provisions.
               For purposes of this Section 5.1(e), each Member's Adjusted
               Capital Account balance shall be determined and the allocation of
               income or gain required hereunder shall be effected, prior to the
               application of any other allocations pursuant to this Section
               5.1, other than Sections 5.1(d), (h) and (i), with respect to
               such taxable period.

               (f) Qualified Income Offset. In the event any Member unexpectedly
               receives any adjustments, allocations or distributions described
               in Treasury Regulation section 1.704-1(b)(2)(ii)(d)(4) through
               (6) (or any successor provisions), items of Company income and
               gain shall be specifically allocated to such Member in an amount
               and manner sufficient to eliminate, to the extent required by the
               Treasury Regulations promulgated under section 704(b) of the
               Code, the deficit balance, if any, in its Adjusted Capital
               Account created by such adjustments, allocations or distributions
               as quickly as possible, unless such deficit balance is otherwise
               eliminated pursuant to Section 5.1(d) or 5.1(e).

               (g) Gross Income Allocations. In the event any Member has a
               deficit balance in its Adjusted Capital Account at the end of
               such taxable period which is in excess of the sum of (i) the
               amount such Member is obligated to restore pursuant to any
               provision of this Agreement and (ii) the amount such Member is
               deemed obligated to restore pursuant to the penultimate sentences
               of Treasury Regulations sections 1.704-2(g)(1) and 1.704-2(i)(5),
               such Member shall be specifically allocated items of Company
               gross income and gain in the amount of such excess as quickly as
               possible; provided that an allocation pursuant to this Section
               5.1(g) shall be made only if and to the extent that such Member
               would have a deficit balance in its Adjusted Capital Account
               after all other allocations provided in this Section 5.1 have
               been tentatively made for such taxable period as if this Section
               5.1(g) was not in the Agreement.

               (h) Nonrecourse Deductions. Nonrecourse Deductions for such
               taxable period shall be allocated to the Members in accordance
               with their respective Membership Interests. If the Members, by a
               Majority Interest, determine in their good faith discretion that
               the Company's Nonrecourse Deductions must be allocated in a
               different ratio to satisfy the safe harbor requirements of the


                                       32
<PAGE>   38


               Treasury Regulations promulgated under section 704(b) of the
               Code, the Company is authorized, upon notice to the Members, to
               revise the prescribed ratio to the numerically closest ratio
               which does satisfy such requirements.

               (i) Member Nonrecourse Deductions. Member Nonrecourse Deductions
               for such taxable period shall be allocated 100% to the Member
               that bears the Economic Risk of Loss for such Member Nonrecourse
               Debt to which such Member Nonrecourse Deductions are attributable
               in accordance with Treasury Regulation section 1.704-2(i) (or any
               successor provision). If more than one Member bears the Economic
               Risk of Loss with respect to a Member Nonrecourse Debt, such
               Member Nonrecourse Deductions attributable thereto shall be
               allocated between or among such Members ratably in proportion to
               their respective shares of such Economic Risk of Loss.

               (j) Special Allocation of Dedicated Property Revenues. Dedicated
               Property Revenues for such taxable period shall be specially
               allocated 71.5072% to Tejas Holding and 28.4928% to Leviathan
               Holding until the aggregate allocations to the Members pursuant
               to this Section 5.1(j) for the current and all prior taxable
               periods equals one hundred percent (100%) of the Special Revenue
               Allocation Amount. This Section 5.1(j) shall be applied with
               respect to each taxable period before application of Sections
               5.1(a), 5.1(b) and 5.1(k), but after application of all other
               subsections of this Section 5.1.

               (k) Special Curative Allocations. To minimize any distortions in
               the manner that the Members would have shared distributions if
               the special allocations pursuant to Sections 5.1 (c) through
               5.1(i) (the "Regulatory Allocations") had not been part of this
               Agreement, the Members may, by agreement of a Majority Interest,
               specially allocate to the Members offsetting items of Company
               income, gain, loss or deduction so that the net amounts allocated
               to each Member pursuant to all of the provisions of this Section
               5.1, including this Section 5.1(k), equal the net amounts that
               would have been allocated to each Member pursuant to Sections
               5.1(a), 5.1(b) and 5.1(j) if the Regulatory Allocations had never
               occurred. In exercising their discretion hereunder, the Members
               shall consider any expected future Regulatory Allocations which
               are likely to offset other Regulatory Allocations previously
               made.

         5.2. Allocations for Tax Purposes.

               (a) Except as otherwise provided herein, for federal income tax
               purposes, each item of income, gain, loss and deduction which is
               recognized by the Company for federal income tax purposes shall
               be allocated among the Members in the same manner as its
               correlative item of "book" income, gain, loss or deduction is
               allocated pursuant to Section 5.1 hereof.

               (b) In an attempt to eliminate Book-Tax Disparities attributable
               to a Contributed Property or Adjusted Property, items of income,
               gain, loss,


                                       33
<PAGE>   39


               depreciation, amortization and cost recovery deductions shall be
               allocated for federal income tax purposes among the Members as
               follows:

                    (i)  (A) In the case of a Contributed Property, such items
                         attributable thereto shall be allocated among the
                         Members in the manner provided under section 704(c) of
                         the Code and section 1.704-3(b) of the Treasury
                         Regulations (i.e. the "traditional method") that takes
                         into account the variation between the Asset Value of
                         such property and its adjusted basis at the time of
                         contribution; and (B) except as otherwise provided in
                         Section 5.2(b)(iii), any item of Residual Gain or
                         Residual Loss attributable to a Contributed Property
                         shall be allocated among the Members in the same manner
                         as its correlative item of "book" gain or loss is
                         allocated pursuant to Section 5.1.

                    (ii) (A) In the case of an Adjusted Property, such items
                         shall (1) first, be allocated among the Members in a
                         manner consistent with the principles of section 704(c)
                         of the Code and section 1.704-3(b) of the Treasury
                         Regulations (i.e. the "traditional method") to take
                         into account the Unrealized Gain or Unrealized Loss
                         attributable to such property and the allocations
                         thereof pursuant to Section 4.5(c)(i) or (ii), and (2)
                         second, in the event such property was originally a
                         Contributed Property, be allocated among the Members in
                         a manner consistent with Section 5.2(b)(i); and (B)
                         except as otherwise provided in Section 5.2(b)(iii),
                         any item of Residual Gain or Residual Loss attributable
                         to an Adjusted Property shall be allocated among the
                         Members in the same manner as its correlative item of
                         "book" gain or loss is allocated pursuant to Section
                         5.1.

                   (iii) Any items of income, gain, loss or deduction otherwise
                         allocable under Section 5.2(b)(i)(B) or 5.2(b)(ii)(B)
                         shall be subject to allocation by the Company in a
                         manner designed to eliminate, to the maximum extent
                         possible, Book-Tax Disparities in a Contributed
                         Property or Adjusted Property otherwise resulting from
                         the application of the "ceiling" limitation (under
                         section 704(c) of the Code or section 704(c)
                         principles) to the allocations provided under Sections
                         5.2(b)(i)(A) and 5.2(b)(ii)(A).

               (c) For the proper administration of the Company, the Company
               shall (i) adopt such conventions as it deems appropriate in
               determining the amount of depreciation, amortization and cost
               recovery deductions; provided, that such depreciation,
               amortization and cost recovery methods shall be the most
               accelerated methods allowed under federal tax laws; (ii) make
               special curative allocations for federal income tax purposes of
               income (including, without limitation, gross income) or
               deductions pursuant to section 1.704-3(c) of the Treasury
               Regulations to eliminate the impact of the "ceiling" limitation
               (under


                                       34
<PAGE>   40


               section 704(c) of the Code and section 704 principles) to the
               allocations provided in Section 5.2(b); and (iii) amend the
               provisions of this Agreement as appropriate to reflect the
               proposal or promulgation of Treasury Regulations under section
               704(b) or section 704(c) of the Code. The Company may adopt such
               conventions, make such allocations and make such amendments to
               this Agreement as provided in this Section 5.2(c) only if such
               conventions, allocations or amendments are consistent with the
               principles of section 704 of the Code.

               (d) The Company may determine to depreciate the portion of an
               adjustment under section 743(b) of the Code attributable to
               unrealized appreciation in any Adjusted Property (to the extent
               of the unamortized Book-Tax Disparity) using a predetermined rate
               derived from the depreciation method and useful life applied to
               the Company's common basis of such property, despite the
               inconsistency of such with Proposed Treasury Regulation section
               1.168-2(n) and Treasury Regulation section 1.167(c)-1(a)(6), or
               any successor provisions. If the Company determines that such
               reporting position cannot reasonably be taken, the Company may
               adopt any reasonable depreciation convention that would not have
               a material adverse effect on the Members.

               (e) Any gain allocated to the Members upon the sale or other
               taxable disposition of any Company asset shall, to the extent
               possible, after taking into account other required allocations of
               gain pursuant to this Section 5.2 be characterized as Recapture
               Income in the same proportions and the same extent as such
               Members (or their predecessors in interest) have been allocated
               any deductions directly or indirectly giving rise to the
               treatment of such gains as Recapture Income.

               (f) All items of income, gain, loss, deduction and credit
               recognized by the Company for federal income tax purposes and
               allocated to the Members in accordance with the provisions hereof
               shall be determined without regard to any election under section
               754 of the Code which may be made by the Company; provided,
               however, that such allocations, once made, shall be adjusted as
               necessary or appropriate to take into account those adjustments
               permitted or required by sections 734 and 743 of the Code.

         5.3. Requirement of Distributions. Subject to the provisions of
Sections 5.6, 7.2 and 12.2, and less the amount of the cash reserves, if any,
set aside pursuant to Section 5.5, the Company shall distribute (within 30 days
following the end of each calendar quarter) such amount of Available Cash, as
determined by the Members under Section 7.2(a)(i), to the Members who were
Record Holders as of the Record Date, as provided in Section 5.4.

         5.4. Sharing of Distributions. Except as provided in Section 12.2, all
distributions attributable to the Membership Interests of the Company paid in
cash, property, or equity ownership of the Company shall be made to the Members
in the following order and priority:

               (a) first, to the Members, in proportion to their respective
               Priority Sharing Ratios (determined as of the end of the calendar
               month preceding the calendar


                                       35
<PAGE>   41


               month in which the distribution is being made), until the
               aggregate amount distributed to them pursuant to this Section
               5.4(a) for the current and all prior taxable periods equals the
               aggregate Dedicated Property Revenues allocated to the Members
               pursuant to Section 5.1(j) for the current and all prior taxable
               periods of the Company; and

               (b) the balance, to the Members in proportion to their respective
               Membership Interests.

         5.5. Reserves. Before payment of any Distributions, there may be set
aside out of any Available Cash such sum or sums as the Members from time to
time, in their absolute discretion, think proper as a cash reserve or reserves
to meet contingencies, for repairing or maintaining any property of the Company,
or for such other purpose as the Members shall determine to be in the best
interest of the Company; and the Company may modify or abolish any such cash
reserve in the manner in which it was created.

         5.6. Distribution Restrictions. Unless unanimously agreed to in writing
by the Members, and subject to the provisions of Section 4.3, the Company shall
not distribute (i) any of the Initial Capital Contributions until the completion
of the construction of the Initial Facilities, except to the extent that all of
the Members agree that the applicable portion of such Initial Capital
Contributions is no longer needed to finance such construction or the operations
of the Company, or (ii) any amounts that would cause the Company materially to
breach, or would create a material default under, any debt agreements or
instruments to which the Company is a party.

                                   ARTICLE VI.

                            MANAGEMENT OF THE COMPANY

         6.1. Management and Delegation of Authority. The Members hereby
unanimously agree that, subject to the provisions of Section 6.3 and Article
VII, TOP shall direct the management and policies of the Company in accordance
with the Act; provided, however, that if the Membership Interest held by TOP
and/or its Affiliates is reduced for any reason to fifty percent (50%) or less,
the Members, as a group, shall direct the management and policies of the Company
in accordance with the Act. Notwithstanding the foregoing to the contrary, to
the extent that actions taken hereunder require the participation of some or all
Members, each Member may act through its respective directors, officers,
employees, representatives, agents and designees, and except for situations in
which the approval of the Members is required by this Agreement or by
nonwaivable provisions of applicable Laws, the Members shall have broad
discretion to authorize any committee constituted pursuant to Section 6.2 or any
officer or other agent to act on behalf of the Company. At a meeting of the
Members at which a quorum is present with respect to any matter as provided in
Section 7.1(a) (except for any matter expressly requiring the affirmative vote
of a Required Interest other than a Majority Interest), the affirmative vote of
a Majority Interest shall be the act of the Members.


                                       36
<PAGE>   42



         6.2. Committees.

               (a) For organizational purposes, the Company may form one or more
               committees of the Members. The types of committees which exist
               from time to time shall be determined by TOP; provided, however,
               that if the Membership Interest held by TOP and/or its Affiliates
               is reduced for any reason to fifty percent (50%) or less, the
               types of committees which exist from time to time shall be
               determined by the Members thereafter. Each Member shall appoint
               one (or more) of its duly authorized agents to act for the Member
               on any committee of the Company. Such agents of each Member shall
               be given the authority by such Member to vote on behalf of the
               Member on any issue within the committee's responsibility and the
               agent(s) of each Member shall have the right to vote on behalf of
               such Member in proportion to such Member's Membership Interest.

               (b) The primary responsibility for business development
               activities for the Company shall reside with TOP, provided,
               however, that if the Membership Interest held by TOP and/or its
               Affiliates is reduced for any reason to fifty percent (50%) or
               less, such primary responsibility shall reside with the Members,
               as a group, thereafter. However, all Members may participate in
               the business development activities of the Company. Each Member
               shall, in good faith, use all reasonable efforts to cooperate
               with and inform the other Members and designees with respect to
               any business development activities conducted on behalf of the
               Company. Each Member may independently approach any potential
               customer or other Person to discuss such potential arrangements;
               provided, however, that as long as TOP or its Affiliates own more
               than 50% of the Membership Interests of all Members, submission
               of any formal proposal to a potential customer will be made only
               by TOP with approval from the Required Interest pursuant to
               Article VII.

         6.3. Authority of Members and Committees.

               (a) With respect to conflicts or disagreements between and among
               any committees, the Members shall have ultimate decision making
               authority. The Members and the committees shall act through the
               Company's officers, employees, representatives, agents and
               designees to whom authority has been expressly delegated. All
               action of the Members shall be taken pursuant to resolutions
               approved by the Members in accordance with Article VII of this
               Agreement.

               (b) Unless otherwise expressly delegated in writing or provided
               by this Agreement, the Members hereby reserve to the Members as a
               group the authority, with respect to the Company, to authorize
               and approve the following in accordance with the provisions of
               Article VII:

                    (i)  authorizing Gas Contracts the term of which could be
                         longer than one year after the date of execution
                         thereof;

                    (ii) authorizing any contract, agreement or other
                         undertaking involving more than $500,000 in any year or
                         $1,000,000 in the aggregate;


                                       37
<PAGE>   43


                    (iii) authorizing a transaction involving the acquisition or
                          construction of a Lateral in accordance with Article
                          XV or an Expansion Project;

                    (iv)  authorizing a transaction involving a lease or similar
                          arrangement which either (A) involves an asset with a
                          fair market value of more than $500,000 or (B) could
                          reasonably be expected to result in payments in excess
                          of $500,000;

                    (v)   approving any operating and capital expenditures
                          budgets;

                    (vi)  authorizing any transaction, including, without
                          limitation, any purchase, sale, lease or exchange of
                          property or the rendering of any service, involving
                          the Company and any Member or any Affiliate of any
                          Member (which transaction, once approved by all of the
                          Members, shall be presumed to be fair to the Company;

                   (vii)  authorizing borrowing money;

                  (viii)  authorizing transactions not in the ordinary course
                          of business;

                    (ix)  determining the cash reserve applicable to
                          distributions of cash and other property as provided
                          in Sections 5.3, 5.5 and 5.6;

                    (x)   utilizing for other than Company purposes, acquiring,
                          or disposing of any material asset of the Company;

                    (xi)  permitting a member of the Company to resign;

                   (xii)  permitting the merger, consolidation, participation in
                          a share exchange or other statutory reorganization
                          with, or sale of all or substantially all of the
                          assets of the Company to any Person;

                  (xiii)  permitting dissolution and liquidation;

                   (xiv)  approving any FERC certificate, if applicable,
                          including, without limitation, the general terms and
                          conditions and the rates and the basis upon which such
                          rates are calculated, or accepting any FERC
                          certificate, if applicable;

                    (xv)  instituting litigation, arbitration, or similar
                          proceedings at a cost to the Company which could
                          reasonably be expected to exceed $500,000.00;
                          provided, however, that if any Member or any Affiliate
                          of a Member is an adverse party thereto, then all of
                          the remaining Members which are not Affiliates of the
                          affected Member shall be entitled to cause the Company
                          to institute such action, but once action has been
                          instituted, then notwithstanding any provision to the
                          contrary herein, all of such remaining


                                       38
<PAGE>   44


                         Members must agree prior to the settlement of any such
                         action. Such non-Affiliate Members' vote shall be
                         sufficient to take such actions under this Section even
                         if such Membership Interest is less than a Majority
                         Interest;

                   (xvi) changing the name of the Company; and

                  (xvii) approval, waiver, amendment, termination (other than
                         by expiration of the term thereof) or other
                         modification of any Operating Agreement.

                    Notwithstanding any provision to the contrary herein, with
                    respect to each matter described in (i) - (xvii) above, the
                    exercise of Member authority shall occur only by the
                    affirmative vote of the applicable Required Interest
                    specified elsewhere in this Agreement, including, without
                    limitation, the unanimous voting requirements set forth in
                    Section 7.2(b); the Super-Majority Interest voting
                    requirements set forth in Section 7.2(a); and the Majority
                    Interest approval requirements set forth in Section 6.1(a).
                    Member approval or disapproval of any matter requiring
                    Member approval (including, without limitation, the matters
                    set forth in this Section 6.3(b) and Sections 7.2(a) and
                    (b)) may be based on any reason whatsoever, in each Member's
                    sole and absolute discretion.

         6.4. Officers.

               (a) The Members may designate one or more Persons to fill one or
               more officer positions of the Company. Such officers may include,
               without limitation, Chief Executive Officer, Chief Financial
               Officer, President, Vice President, Treasurer, Assistant
               Treasurer, Secretary and Assistant Secretary. No officer need be
               a resident of the State of Delaware. The Members may assign
               titles to particular officers. Each officer shall hold office
               until his successor shall be duly designated and shall qualify to
               hold such office, or until his death or until he shall resign or
               shall have been removed in the manner hereinafter provided. Any
               number of offices may be held by the same Person. The salaries or
               other compensation, if any, of the officers and agents of the
               Company may be fixed from time to time by the Members.
               Notwithstanding any other provisions of this Agreement, the
               authority of any officers, employees or agents of the Company
               shall be restricted to the carrying on of the day-to-day affairs
               of the Company and any such authority shall be subject to the
               supervisory control of the Members. Only Members or their duly
               authorized agents shall have the authority to make policy
               decisions for the Company. Unless the Members decide otherwise,
               the assignment of such title shall constitute the delegation to
               such officer of the authority and duties set forth below:

                    (i)  President. Unless otherwise specified by the Members,
                         the President shall be the chief operating officer of
                         the Company and have general executive powers to manage
                         the operations of the


                                       39
<PAGE>   45


                          Company, and such other powers and duties under this
                          Agreement as the Members may from time to time
                          prescribe.

                    (ii)  Vice Presidents. In the absence of the President, or
                          in the event of his inability to act, the Vice
                          President (or in the event there be more than one Vice
                          President, the Vice Presidents in the order designated
                          by the Members, or in the absence of any such
                          designation, then in the order of their election or
                          appointment) shall perform the duties of the
                          President, and when so acting, shall have all the
                          powers of and be subject to all the restrictions upon
                          the President.

                    (iii) Secretary. The Secretary shall keep the minutes of the
                          meetings of the Company and shall exercise general
                          supervision over the files of the Company. The
                          Secretary shall give notice of meetings and shall
                          perform other duties commonly incident to such office.

                    (iv)  Assistant Secretary. At the request of the Secretary
                          or in the Secretary's absence or inability to act, the
                          Assistant Secretary shall perform part or all of the
                          Secretary's duties.

                    (v)   Treasurer. The Treasurer shall have general
                          supervision of the funds, securities, notes, drafts,
                          acceptances, and other commercial paper and evidences
                          of indebtedness of the Company and he shall determine
                          that funds belonging to the Company are kept on
                          deposit in such banking institutions as the Members
                          may from time to time direct. The Treasurer shall
                          determine that accurate accounting records are kept,
                          and the Treasurer shall render reports of the same and
                          of the financial condition of the Company to the
                          Members at any time upon request. The Treasurer shall
                          perform other duties commonly incident to such office,
                          including, but not limited to, the execution of tax
                          returns.

                    (vi)  Assistant Treasurer. At the request of the Treasurer
                          or in the Treasurer's absence or inability to act, the
                          Assistant Treasurer shall perform part or all of the
                          Treasurer's duties.

               (b) Any officer may resign as such at any time. Such resignation
               shall be made in writing and shall take effect at the time
               specified therein, or if no time be specified, at the time of its
               receipt by the Company. The acceptance of a resignation shall not
               be necessary to make it effective, unless expressly so provided
               in the resignation. Any officer may be removed as such, either
               with or without cause, by the Members; provided, however, that
               such removal shall be without prejudice to the contract rights,
               if any, of the officer so removed. Designation of an officer
               shall not of itself create contract rights. Any vacancy occurring
               in any office of the Company may be filled by the Members.


                                       40
<PAGE>   46

         6.5. Duties of Officers. Each officer shall devote such time, effort,
and skill to the Company's business affairs as he deems necessary and proper for
the Company's welfare and success. The Members expressly recognize that the
officers have substantial other business relationships and activities with
Persons other than the Company.

         6.6. No Duty to Consult. Except as otherwise provided herein or by
applicable law, neither the Company nor its duly appointed agents, designees or
representatives or the officers of the Company shall have a duty or obligation
to consult with or seek advice of the Members on any matter relating to the
day-to-day business affairs of the Company duly delegated to such Persons;
provided, however, that such Persons shall not be restricted from consulting
with or seeking the advice of the Members.

         6.7. Reimbursement. Except for pre-formation expenses paid by each
respective Member and treated as an Initial Capital Contribution pursuant to
Section 4.1(a), all expenses incurred with respect to the organization,
operation and management of the Company shall be borne by the Company.

         6.8. Members and Affiliates Dealing With the Company. Subject to
obtaining any consent expressly required hereunder, the Company may appoint,
employ, contract, or otherwise deal with any Person, including Affiliates of the
Members, individuals with whom the Members are otherwise related, and with
business entities which have a financial interest in a Member or in which a
Member has a financial interest, for transacting Company business, including any
acts or services for the Company as the members of any committee, officer or
other representative with the proper authority may approve.

         6.9. Insurance. Each Member, according to its proportionate share equal
to its Membership Interest, shall make available for its own benefit and the
benefit of the Company, the insurance coverages described on "Exhibit C.I"
hereto and such other insurance as may be required by applicable Laws. All such
insurance policies provided by each Member shall provide that the insurers waive
their right of subrogation against the Company and the relevant Member, any of
their respective Affiliates, or any other party indemnified by the Company, and
shall name the Company as an additional insured.

         The Company shall provide the applicable insurance coverages described
on "Exhibits C. II and C.III" for the benefit of the Company, Leviathan Holding,
and Tejas Holding. The costs of the insurance coverages described on Exhibits
C.II and C.III which are obtained by the Company (if any) shall automatically be
included in the applicable operating budget for the Company without the
necessity of approval by the Members. All such insurance policies provided by
the Company shall provide that the insurers waive their right of subrogation
against the Company, Leviathan Holding, and Tejas Holding, any of their
respective Affiliates, or any other party indemnified by Company, and shall name
Leviathan Holding and Tejas Holding as additional insureds.


                                       41
<PAGE>   47


                                  ARTICLE VII.

                                    MEETINGS

         7.1. Meetings of Members and Committees.

               (a) A quorum shall be present at a meeting of Members or any
               committee of the Company if the holders of at least 33% of all
               Membership Interests are represented at the meeting in person or
               by proxy.

               (b) All meetings of the Members or any committee of the Company
               shall be held at the principal place of business of the Company
               or at such other place within or without the State of Delaware as
               shall be specified or fixed in the notices or waivers of notice
               thereof; provided that any or all Members or their
               representatives may participate in any such meeting by means of
               conference telephone or similar communications equipment pursuant
               to Section 16.11. No Member shall willfully be absent from any
               meeting of the Members or any committee of the Company.

               (c) Notwithstanding the other provisions of this Agreement, a
               Majority Interest represented (in person or by proxy) at a
               meeting at which a quorum is present shall have the power to
               adjourn such meeting from time to time, without any notice other
               than an announcement at the meeting of the time and place of the
               resumption of the adjourned meeting. The time and place of such
               adjournment shall be determined by a vote of such Membership
               Interest. Upon the resumption of such adjourned meeting, any
               business may be transacted that might have been transacted at the
               meeting as originally called.

               (d) Unless otherwise expressly provided in a written notice
               issued by the Members, an annual meeting of the Members for the
               transaction of such business as may properly come before such
               meeting shall be held at the principal office of the Company at
               10:00 a.m. on the second Tuesday which is a Business Day in the
               month of May or such other date as to which the Members mutually
               agree. Regularly scheduled, periodic meetings of the Members or
               any committee of the Company may be held without special notice
               to the Members or Member representatives at such times and places
               as shall from time to time be determined by resolution of the
               Members or such Member representatives and communicated to all
               Members or their representatives. Each Member, or its
               representatives in the case of committee meetings, shall use
               reasonable efforts to inform the other Members or committee
               representatives of any business matters that it intends to raise
               at any regular meeting of the Members or any committee of the
               Company within a reasonable time prior to such meeting.

               (e) Special meetings of the Members or any committee of the
               Company, for any purpose or purposes, unless otherwise prescribed
               by law, shall be called by (i) the President or Secretary (if
               any), (ii) any one or more Members holding at least 20% of the
               Membership Interests of the Company in the aggregate or (iii) any
               two


                                       42
<PAGE>   48


               or more non-Affiliated Members. Such request of the President,
               Secretary or Member(s) shall state the purpose or purposes of the
               proposed meeting.

               (f) Except as provided otherwise by this Agreement or applicable
               law, written or printed notice stating the place, day and hour of
               the meeting and the purpose or purposes for which such meeting is
               called, shall be delivered not less than ten (10) nor more than
               sixty (60) days (including Saturdays, Sundays and holidays)
               before the date of the proposed meeting, either personally, by
               certified mail (return receipt requested) or by telecopy (with a
               copy delivered via United States mail), by or at the direction of
               the Person calling the meeting, to each Member or Member
               representative, as the case may be, entitled to vote thereat. If
               mailed, any such notice shall be deemed to be delivered when
               deposited in the United States mail, addressed to the Member, or
               Member representative, at its address provided for in Section
               16.19, with postage thereon prepaid.

               (g) The date on which notice of a meeting of the Members or any
               committee of the Company is mailed shall be the Record Date for
               the determination of the Members or Member representatives
               entitled to notice of or to vote at such meeting, including any
               adjournment thereof, or the Members or Member representatives
               entitled to receive such notice.

         7.2. Special Actions.

               (a) Super-Majority Interest Approval. The approval of the holders
               of a Super-Majority Interest of the Members shall be required to
               authorize and approve the following:

                    (i)  except with respect to cash reserves consistent with
                         historical practices, determining the cash reserves
                         applicable to distributions of cash and other property
                         as provided in Sections 5.3, 5.5 and 5.6, other than
                         (A) cash reserves relating to acquiring, constructing
                         or otherwise obtaining (including, without limitation,
                         pursuant to a lease or similar arrangement approved in
                         accordance with Section 7.2(a)(v)) any pipeline,
                         lateral or extension, including any Lateral or any
                         compression, expansion or other significant facilities
                         if such reserve exceeds, at any one time, $100,000, but
                         is less than or equal to $1,000,000 (the authorization
                         for which requires at least the approval of a Majority
                         Interest) or (B) cash reserves described in Section
                         7.2(a)(ii) (requiring at least a Super Majority
                         Interest) or Section 7.2(b)(ix) requiring unanimity);

                    (ii) determining the cash reserves applicable to
                         distributions of cash and other property as provided in
                         Sections 5.3, 5.5 and 5.6, to the extent such cash
                         reserves (A) relate to acquiring, constructing, leasing
                         or otherwise obtaining any pipeline, lateral or
                         extension, including any Lateral or any compression,
                         expansion or other


                                       43
<PAGE>   49


                          significant facilities and (B) exceed, at any one
                          time, $1,000,000, but is less than or equal to
                          $5,000,000;

                   (iii)  (A) entering into any credit agreement, indenture or
                          similar agreement or (B) borrowing money or making
                          draws under any such previously approved credit
                          agreement, indenture or similar agreement for the
                          purpose of funding authorized transactions with an
                          approved cost to the Company of more than $1,000,000,
                          but less than or equal to $5,000,000;

                    (iv)  except as otherwise provided in Section 7.2(a)(vi),
                          utilizing other than for Company purposes, acquiring
                          or disposing of any asset of the Company having a then
                          existing fair market value or GAAP net book value
                          (after deducting accumulated depreciation, depletion,
                          amortization and impairment) of more than $1,000,000
                          but less than or equal to $5,000,000;

                    (v)   authorizing a transaction involving a lease or similar
                          arrangement which either (A) involves an asset with a
                          fair market value of more than $1,000,000 but less
                          than or equal to $5,000,000 or (B) could reasonably be
                          expected to result in payments of more than $1,000,000
                          but less than or equal to $5,000,000; and

                    (vi)  subject to the provisions of Sections 15.1, 15.2, and
                          15.3, as applicable, authorizing a transaction which
                          involves acquiring, constructing or otherwise
                          obtaining (x) any pipeline, lateral or extension,
                          including any Lateral, or (y) any compression,
                          expansion or other significant facilities, including
                          any Expansion Project (except Expansion Projects
                          expressly permitted by Section 15.2), which, in the
                          case of either clause (x) or (y), could reasonably be
                          expected to have a cost to the Company of more than
                          $1,000,000 but less than or equal to $5,000,000.

                    (vii) authorizing Gas Contracts that provide for a term
                          equal to or longer than one year after the date of
                          execution thereof.

               (b) Unanimous Approval. The approval of the holders of all of the
               Membership Interest of the Members shall be required to authorize
               and approve the following:

                    (i)   approving any FERC certificate, including any
                          amendment or modifications of any FERC certificate, if
                          applicable, or any subsequent FERC certificate, if
                          applicable, including, without limitation, the general
                          terms and conditions and the rates and the basis upon
                          which such rates are calculated;

                    (ii)  termination (other than by expiration of the term
                          thereof) of the Construction Agreement with respect to
                          the Initial Facilities or the


                                       44
<PAGE>   50


                         Operating Agreement or any other operating agreement
                         with respect to the operation of the Brutus Gathering
                         Facilities;

                   (iii) changing the name of the Company;

                    (iv) instituting litigation, arbitration or similar
                         proceedings against Persons other than any Member or
                         Affiliate of any Member at a cost to the Company which
                         would reasonably be expected to exceed $500,000.00;

                    (v)  making draws under any credit agreement, indenture, or
                         similar agreement approved in accordance with the terms
                         of Section 7.2(a)(iii)(A), for the purpose of funding
                         authorized transactions with an approved cost to the
                         Company of more than $5,000,000;

                    (vi) except as otherwise provided in Section 7.2(b)(vii),
                         utilizing other than for company purposes, acquiring or
                         disposing of any asset of the Company or its
                         Subsidiaries, having a then existing fair market value
                         or GAAP net book value (after deducting accumulated
                         depreciation, depletion, amortization and impairment)
                         of more than $5,000,000;

                   (vii) subject to the provisions of Sections 15.1, 15.2, and
                         15.3, as applicable, authorizing a transaction which
                         involves acquiring, constructing or otherwise obtaining
                         (x) any pipeline, lateral or extension, including any
                         Lateral, or (y) any compression, expansion or other
                         significant facilities, including any Expansion Project
                         (except Expansion Projects expressly permitted by
                         Section 15.2), which, in the case of either clause (x)
                         or (y), could reasonably be expected to have a cost to
                         the Company of more than $5,000,000;

                  (viii) authorizing a transaction involving a lease or
                         similar arrangement which either (A) involves an asset
                         with a fair market value of more than $5,000,000 or (B)
                         could reasonably be expected to result in payments of
                         more than $5,000,000;

                    (ix) authorizing any transaction or any amendment thereto,
                         including, without limitation, any purchase, sale,
                         lease or exchange of property or the rendering of any
                         service involving the Company and any Member or any
                         Affiliate of any Member that is not an arm's length
                         transaction (which transaction, once approved by all of
                         the Members, shall be presumed to be fair to the
                         Company); and

                    (x)  permitting the conversion, merger, consolidation, or
                         participation in a share exchange or other statutory
                         reorganization with, or sale of all or substantially
                         all of the assets of the Company to any Person;


                                       45
<PAGE>   51


                    (xi) approving the operating and capital expenditure budgets
                         of the Company;

                   (xii) approving any cash reserve applicable to distributions
                         of cash and other property as provided in Sections 5.3,
                         5.5 and 5.6, to the extent such cash reserve (A)
                         relates to acquiring, constructing or otherwise
                         obtaining (including, without limitation, pursuant to a
                         lease or similar arrangement approved in accordance
                         with Section 7.2(b)(vii)) any pipeline, lateral or
                         extension, including any Lateral, or any compression,
                         expansion or other significant facilities and (B)
                         exceeds, at any one time, $5,000,000; and

                  (xiii) actions for which this Agreement otherwise expressly
                         requires unanimous approval, including, without
                         limitation, any of the actions set forth in Sections
                         3.8 (creation of additional Membership Interests), 3.12
                         (Resignation), 4.2 (subsequent Capital Contributions),
                         5.6 (distribution of Initial Capital Contributions),
                         12.1(a) (Dissolution and Liquidation) and 13.2
                         (Amendments).

         7.3. Voting List. The officer of the Company or the designated Member
who is responsible for the maintenance of the Company's records shall make, at
least ten days before each meeting of Members, a complete list of the Members or
their representatives, as the case may be, entitled to vote thereat or any
adjournment thereof, arranged in alphabetical order, with the address of and the
Membership Interest held or represented by each, which list, for a period of ten
days prior to such meeting, shall be kept on file at the registered office or
principal place of business of the Company and shall be subject to inspection by
any Member or Member representative at any time during usual business hours.
Such list shall also be produced and kept open at the time and place of the
meeting and shall be subject to the inspection of any Member or Member
representative during the whole time of the meeting. The original Company
records shall be prima facie evidence as to who are the Members or their
representatives entitled to examine such list or transfer records or to vote at
any meeting of Members. Failure to comply with the requirements of this Section
7.3 shall not affect the validity of any action taken at the meeting.

         7.4. Proxies. A Member or Member representative may vote either in
person or by proxy executed in writing by the Member or Member representative. A
telegram, telex, cablegram or similar transmission by the Member or Member
representative or a photographic, photostatic, facsimile or similar reproduction
of writing executed by the Member or Member representative shall be treated as
an execution in writing for purposes of this Section 7.4. Proxies for use at any
meeting of the Members or committee of the Company or in connection with the
taking of any action by written consent shall be filed with the Company before
or at the time of the meeting or execution of the written consent, as the case
may be. All proxies shall be received and taken charge of and all ballots shall
be received and canvassed by an inspector or inspectors appointed by the
President or a Vice President of the Company who shall decide all questions
touching upon the qualification of voters, the validity of the proxies, and the
acceptance or rejection of votes.


                                       46
<PAGE>   52


         7.5. Votes. Each Member or Member representative shall be entitled to
one vote (or a fraction thereof) per percent (or fraction thereof) of Membership
Interest held by such Member, as reflected in the transfer records of the
Company; provided, however, that for purposes of determining a quorum or a
Required Interest, the Membership Interest of any Member shall not be counted
and such interest shall be apportioned by interest among the remaining Members
as applicable if the Member is not permitted to vote under this Agreement for
any reason, including, without limitation, the relevant Member is in Default, is
not deemed to be a Substituted Member or is in breach of certain representations
and warranties; provided, however, that no Member shall be required to make any
Capital Contribution, other than an Initial Capital Contribution, if such Member
did not vote to approve such Capital Contribution in accordance with Section
4.2.

         7.6. Conduct of Meetings. All meetings of the Members or committees of
the Company shall be presided over by the chairman of the meeting, who shall be
designated by, in order of priority, the President, the Vice President or other
appropriate officer of the Company. The chairman of any meeting of Members or
committee of the Company shall determine the order of business and the procedure
at the meeting, including regulation of the manner of voting and the conduct of
discussion.

         7.7. Action by Written Consent.

               (a) Except as otherwise provided by applicable Laws, any action
               required or permitted to be taken at any meeting of Members or
               committee of the Company may be taken without a meeting, and
               without a vote, if a consent or consents in writing, setting
               forth the action so taken, shall be signed by the holder or
               holders or representatives of not less than the minimum of
               Membership Interests that would be necessary to take such action
               at a meeting at which the holders of all Membership Interests
               entitled to vote on the action were present and voted; provided,
               however, that no such written consent shall be effective unless
               each Member has been provided with at least 3 Business Days prior
               written notice of such consent to be sought or has waived the
               requirement of such notice. To the extent required by law, every
               written consent shall bear the date of signature of each Member
               or Member representative who signs the consent. To the extent
               required by law, no written consent shall be effective to take
               the action that is the subject of such consent unless, within 60
               days after the date of the earliest dated consent delivered to
               the Company in the manner required by this Section 7.7, a consent
               or consents signed by the holder or holders of not less than the
               minimum Membership Interests that would be necessary to take the
               action that is the subject of the consent are delivered to the
               Company by delivery to its registered office or its principal
               place of business. Delivery shall be by hand or certified or
               registered mail (return receipt requested) to the Company's
               principal place of business and shall be addressed to the
               Secretary of the Company. A telegram, telex, cablegram or similar
               transmission by a Member or Member representative, or a
               photographic, photostatic, facsimile or similar reproduction of a
               writing signed by a Member or Member representative, shall be
               regarded as signed by the Member or Member representative for
               purposes of this Section 7.7. In addition to the prior written
               notice described above, prompt written notice of the taking of
               any action


                                       47
<PAGE>   53


               by the Members or committees of the Company without a meeting by
               less than unanimous written consent shall be given to those
               Members or Member representatives who did not consent in writing
               to the action.

               (b) The Record Date for determining Members or their
               representatives entitled to consent to an action in writing
               without a meeting shall be the first date on which a signed
               written consent setting forth the action taken or proposed to be
               taken is delivered to the Company. Delivery of such written
               consent shall be by hand or by certified or registered mail
               (return receipt requested) to the Company's principal place of
               business and shall be addressed to the Secretary of the Company.

         7.8. Records. An officer of the Company or a designated Member
representative shall be responsible for maintaining the records of the Company,
including keeping minutes at the meetings of the Members or committees of the
Company and the filing of consents in the records of the Company.

                                  ARTICLE VIII.

                                 INDEMNIFICATION

         8.1. Right to Indemnification. Subject to the limitations and
conditions as provided herein or by applicable Laws, each Person who was or is
made a party or is threatened to be made a party to or is involved in any
threatened, pending or completed action, suit or proceeding, whether civil,
criminal, administrative, arbitrative or investigative (hereinafter a
"Proceeding"), or any appeal in such a Proceeding or any inquiry or
investigation that could lead to such a Proceeding, by reason of the fact that
he or she, or a Person of whom he or she is the legal representative, is or was
a Member of the Company, a member of a committee of the Company or an officer of
the Company, or while such a Person is or was serving at the request of the
Company as a director, officer, partner, venturer, member, trustee, employee,
agent or similar functionary of another foreign or domestic general partnership,
corporation, limited partnership, joint venture, limited liability company,
trust, employee benefit plan or other enterprise, shall be indemnified by the
Company to the extent such Proceeding or other above-described process relates
to any such above-described relationships with, status with respect to, or
representation of any such Person to the fullest extent permitted by the Act, as
the same exists or may hereafter be amended (but, in the case of any such
amendment, only to the extent that such amendment permits the Company to provide
broader indemnification rights than said Laws permitted the Company to provide
prior to such amendment) against judgments, penalties (including excise and
similar taxes and punitive damages), fines, settlements and reasonable expenses
(including, without limitation, attorneys' fees) actually incurred by such
Person in connection with such Proceeding, and indemnification under this
Article VIII shall continue as to a Person who has ceased to serve in the
capacity which initially entitled such Person to indemnity hereunder for any and
all liabilities and damages related to and arising from such Person's activities
while acting in such capacity; provided, however, that no Person shall be
entitled to indemnification under this Section 8.1 in the event the Proceeding
involves acts or omissions of such Person which constitute an intentional breach
of this Agreement or gross negligence or willful misconduct on the part of such
Person. The rights granted pursuant to this Article VIII shall be


                                       48
<PAGE>   54


deemed contract rights, and no amendment, modification or repeal of this Article
VIII shall have the effect of limiting or denying any such rights with respect
to actions taken or Proceedings arising prior to any such amendment,
modification or repeal. It is expressly acknowledged that the indemnification
provided in this Article VIII could involve indemnification for negligence or
under theories of strict liability.

         8.2. Indemnification of Officers, Employees and Agents. The Company may
indemnify, and advance expenses to, Persons who are not or were not a Member,
including officers, employees or agents of the Company, and those Persons who
are or were serving at the request of the Company as a manager, director,
officer, partner, venturer, member, trustee, employee, agent or similar
functionary of another foreign or domestic general partnership, corporation,
limited partnership, joint venture, limited liability company, trust, employee
benefit plan or other enterprise against any liability asserted against such
Person and incurred by such Person in such a capacity or arising out of his
status as such a Person to the same extent that it may indemnify and advance
expenses to a Member under this Article VIII.

         8.3. Advance Payment. Any right to indemnification conferred in this
Article VIII shall include a limited right to be paid or reimbursed by the
Company for any and all reasonable expenses as they are incurred by a Person
entitled to be indemnified under Sections 8.1 and 8.2 who was, or is threatened,
to be made a named defendant or respondent in a Proceeding in advance of the
final disposition of the Proceeding and without any determination as to such
Person's ultimate entitlement to indemnification; provided, however, that the
payment of such expenses incurred by any such Person in advance of final
disposition of a Proceeding shall be made only upon delivery to the Company of a
written affirmation by such Person of his good faith belief that he has met the
requirements necessary for indemnification under this Article VIII and a written
undertaking, by or on behalf of such Person, to repay all amounts so advanced if
it shall ultimately be determined that such indemnified Person is not entitled
to be indemnified under this Article VIII or otherwise.

         8.4. Appearance as a Witness. Notwithstanding any other provision of
this Article VIII, the Company may pay or reimburse expenses incurred by any
Person entitled to be indemnified pursuant to this Article VIII in connection
with such Person's appearance as a witness or other participation in a
Proceeding at a time when he is not a named defendant or respondent in the
Proceeding.

         8.5. Nonexclusivity of Rights. The right to indemnification and the
advancement and payment of expenses conferred in this Article VIII shall not be
exclusive of any other right which a Person indemnified pursuant to Sections 8.1
and 8.2 may have or hereafter acquire under any Laws, this Agreement, or any
other agreement, vote of Members or otherwise.

         8.6. Insurance. The Company may purchase and maintain indemnification
insurance, at its expense, to protect itself and any Person from any expenses,
liabilities, or losses that may be indemnified under this Article VIII.

         8.7. Member Notification. Any indemnification of or advance of expenses
to any Person entitled to be indemnified under this Article VIII shall be
reported in writing to the Members with or before the notice or waiver of notice
of the next Members' meeting or with or


                                       49
<PAGE>   55


before the next submission to Members of a consent to action without a meeting
and, in any case, within the 12 month period immediately following the date the
indemnification or advance was made.

         8.8. Savings Clause. If this Article VIII or any portion hereof shall
be invalidated on any ground by any court of competent jurisdiction, then the
Company shall nevertheless indemnify and hold harmless any Person entitled to be
indemnified pursuant to this Article VIII as to costs, charges and expenses
(including attorneys' fees), judgments, fines and amounts paid in settlement
with respect to any action, suit or proceeding, whether civil, criminal,
administrative or investigative to the full extent permitted by any applicable
portion of this Article VIII that shall not have been invalidated and to the
fullest extent permitted by applicable Laws.

         8.9. Scope of Indemnity. For the purposes of this Article VIII,
references to the "Company" include all constituent entities, whether
corporations or otherwise, absorbed in a consolidation or merger as well as the
resulting or surviving entity. Thus, any Person entitled to be indemnified or
receive advances under this Article VIII shall stand in the same position under
the provisions of this Article VIII with respect to the resulting or surviving
entity as he would have if such merger, consolidation, or other reorganization
never occurred.

                                   ARTICLE IX.

                                      TAXES

         9.1. Tax Returns. The Company shall cause to be prepared and filed all
necessary federal and state income tax returns for the Company, including making
the elections described in Section 9.2. Upon written request by the Company,
each Member shall furnish to the Company all pertinent information in its
possession relating to Company operations that is necessary to enable the
Company's income tax returns to be prepared and filed.

         9.2. Tax Elections. The Company shall make the following elections on
the appropriate tax returns:

               (a)  to adopt the accrual method of accounting;

               (b)  an election pursuant to section 754 of the Code;

               (c)  to elect to amortize the organizational expenses of the
                    Company and the start-up expenditures of the Company under
                    section 195 of the Code ratably over a period of 60 months
                    as permitted by section 709(b) of the Code; and

               (d)  any other election that the Company may deem appropriate and
                    in the best interests of the Company or Members, as the case
                    may be.

Neither the Company nor any Member may make an election for the Company to be
excluded from the application of the provisions of subchapter K of chapter 1 of
subtitle A of the Code or any similar provisions of applicable state law, and no
provision of this Agreement shall be construed to sanction or approve such an
election.


                                       50
<PAGE>   56


         9.3. Tax Matters Member. The Company shall select one of the Members as
the "Tax Matters Member" of the Company pursuant to section 6231(a)(7) of the
Code. The Tax Matters Member shall take such action as may be necessary to cause
each Member to become a "notice partner" within the meaning of section 6223 of
the Code and shall inform each Member of all significant matters that may come
to its attention in its capacity as Tax Matters Member by giving notice thereof
on or before the fifth Business Day after becoming aware thereof and, within
that time, shall forward to each other Member copies of all significant written
communications it may receive in that capacity. The Tax Matters Member may not
take any action contemplated by sections 6222 through 6232 of the Code without
the consent of a Super-Majority Interest, but this sentence does not authorize
the Tax Matters Member to take any action left to the determination of an
individual Member under sections 6222 through 6232 of the Code. The initial Tax
Matters Member shall be the Member so indicated on Exhibit A.

                                   ARTICLE X.

                   BOOKS, RECORDS, REPORTS, AND BANK ACCOUNTS

         10.1. Maintenance of Books. The Company shall keep books and records of
accounts and shall keep minutes of the proceedings of its Members. The books of
account for the Company shall be maintained on an accrual basis in accordance
with the terms of this Agreement and GAAP, except that the Capital Accounts of
the Members shall be maintained in accordance with Section 4.5. The accounting
year of the Company shall be determined by the Company. The initial custodian of
the company records shall be the Tax Matters Members.

         10.2. Financial Statements. On or before the last day of each calendar
month during the existence of the Company, the Company shall cause each Member
to be furnished with an income statement for the calendar month immediately
preceding such calendar month. On or before the last day of each January, April,
July and October during the existence of the Company, the Company shall cause
each Member to be furnished with a balance sheet and a statement of cash flows
for, or as of the end of, the fiscal quarter immediately preceding such calendar
month. On or before the last day of each April during the existence of the
Company, the Company shall cause each Member to be furnished with audited
financial statements, including, a balance sheet, an income statement, a
statement of cash flows, and a statement of changes in each Member's Capital
Account for the immediately preceding calendar year. Annual financial statements
must be prepared in accordance with GAAP. The Company also may cause to be
prepared or delivered such other reports as it may deem, in its sole judgment,
appropriate. The Company shall bear the costs of all such reports and financial
statements.

         10.3. Tax Statements. On or before the last day of July during the
existence of the Company, the Company shall cause each Member to be furnished
with all information reasonably necessary or appropriate to file their
appropriate tax reports, including a schedule of Company book-tax differences
for, or as of the end of, the immediately preceding tax year. In addition, to
the extent reasonably possible, the Company will cause each Member to be
provided with estimates of all such information on or before the first day of
February each year.

         10.4. Accounts. The officers or designated Members of the Company shall
establish and maintain one or more separate bank and investment accounts and
arrangements for Company


                                       51
<PAGE>   57


funds in the Company's name with financial institutions and firms that officers
or designated Members of the Company may determine. The Company may not
commingle the Company's funds with the funds of any other Person. All such
accounts shall be and remain the property of the Company and all funds shall be
received, held and disbursed for the purposes specified in this Agreement. The
officers or designated Members of the Company may invest the Company funds only
in (i) readily marketable securities issued by the United States or any agency
or instrumentality thereof and backed by the full faith and credit of the United
States maturing within three months or less from the date of acquisition, (ii)
readily marketable securities issued by any state or municipality within the
United States of America or any political subdivision, agency or instrumentality
thereof, maturing within three months or less from the date of acquisition and
rated "A" or better by any recognized rating agency, (iii) readily marketable
commercial paper rated "Prime 1" by Moody's or "A 1" by Standard and Poor's (or
comparably rated by such organizations or any successors thereto if the rating
system is changed or there are such successors) and maturing in not more than
three months after the date of acquisition or (iv) certificates of deposit or
time deposits issued by any incorporated bank organized and doing business under
the Laws of the United States of America which is rated at least "A" or "A2" by
Standard and Poor's or Moody's, which is not in excess of federally insured
amounts, and which matures within three months or less from the date of
acquisition.

                                   ARTICLE XI.

                             BANKRUPTCY OF A MEMBER

         11.1. Bankrupt Members. If any Member becomes a Bankrupt Member, the
Company, by approval of at least a majority in interest of the Members excluding
any Bankrupt Member or, if the Company does not exercise the relevant option,
the non-Bankrupt Members which desire to participate, shall have the option,
exercisable by notice from the Company or the Members, as the case may be, to
the Bankrupt Member (or its representative) at any time prior to the 180th day
after receipt of notice of the occurrence of the event causing it to become a
Bankrupt Member, to buy, and, on the exercise of this option, the Bankrupt
Member or its representative shall sell, its Membership Interest. The purchase
price shall be an amount equal to the fair market value thereof determined by
agreement by the Bankrupt Member (or its representative) and the potential
purchaser; however, if those Persons do not agree on the fair market value on or
before the 90th day following the date of receipt by such potential purchaser of
notice of the occurrence of the event causing the Member to become a Bankrupt
Member, either such Person, by written notice to the other, may require the
determination of fair market value to be made by an independent appraiser
specified in such notice. If the Person receiving that notice objects on or
before the tenth day following receipt to the independent appraiser designated
in that notice, and those Persons otherwise fail to agree on an independent
appraiser, either such Person may petition the United States District Judge for
the Southern District of Texas then senior in active service to designate an
independent appraiser, whose determination of the independent appraiser, however
designated, is final and binding on all parties. The Bankrupt Member and the
potential purchaser each shall pay one-half of the costs of the appraisal and
court costs in appointing an appraiser (if any). If the potential purchaser then
elects, within ten days after the fair market value has been decided by
agreement or by an independent appraiser, to exercise the purchase option, the
purchasing Person shall pay the fair market value as so determined in cash on
closing. The payment to be made to the Bankrupt Member or its representative
pursuant to this Section


                                       52
<PAGE>   58


11.1 is in complete liquidation and satisfaction of all the rights and interest
of the Bankrupt Member and its representative (and of all Persons claiming by,
through, or under the Bankrupt Member and its representative) in and in respect
of the Company, including, without limitation, any Membership Interest, any
rights in specific Company property, and any rights against the Company and its
officers, agents, and representatives and (insofar as the affairs of the Company
are concerned) against the Members.

                                  ARTICLE XII.

                    DISSOLUTION, LIQUIDATION, AND TERMINATION

         12.1. Dissolution. Subject to the provisions of Section 12.2 and any
applicable Laws, the Company shall dissolve and its affairs shall be wound up on
the first to occur, and only in the event of, the following:

               (a) the consent of all of the Membership Interests; and

               (b) entry of a decree of judicial dissolution of the Company
               under section 18-802 of the Act in accordance with Section 16.8.

         Each Member expressly agrees that the bankruptcy or dissolution of a
Member or other event described in section 18-801 of the Act (other than a
Transfer of Membership Interest in accordance with the terms of this Agreement)
shall not cause or result in the dissolution of the Company.

         12.2. Liquidation and Termination. Subject to Section 7.5, upon
dissolution of the Company, a representative of the Company selected by a
Majority Interest (not including any Member in Default at the time of
dissolution) shall act as a liquidator or may appoint one or more Members as
liquidator ("Liquidator"). The Liquidator shall proceed diligently to wind up
the affairs of the Company and make final distributions as provided herein and
in the Act. The costs of liquidation shall be borne as a Company expense. Until
final distribution, the Liquidator shall continue to operate the Company
properties for a reasonable period of time to allow for the sale of all or a
part of the assets thereof with all of the power and authority of the Members.
The steps to be accomplished by the Liquidator are as follows:

               (a)  as promptly as possible after dissolution and again after
                    final liquidation, the Liquidator shall cause a proper
                    accounting to be made of the Company's assets, liabilities,
                    and operations through the last day of the calendar month in
                    which the dissolution occurs or the final liquidation is
                    completed, as applicable;

               (b)  the Liquidator shall cause any notices required by law to be
                    mailed to each known creditor of and claimant against the
                    Company in the manner described by such law;

               (c)  subject to the terms and conditions of this Agreement and
                    the Act (especially section 18-803), the Liquidator shall
                    distribute the assets of the Company in the following order:


                                       53
<PAGE>   59


                    (i)  the Liquidator shall pay, satisfy or discharge from
                         Company funds all of the debts, liabilities and
                         obligations of the Company, including, without
                         limitation, all expenses incurred in liquidation or
                         otherwise make adequate provision for payment and
                         discharge thereof (including, without limitation, the
                         establishment of a cash escrow fund for contingent
                         liabilities in such amount and for such term as the
                         Liquidator may reasonably determine); provided,
                         however, such payments shall not include any Capital
                         Contributions described in Article IV or any other
                         obligations in favor of the Members created by this
                         Agreement other than a loan made pursuant to any
                         provision other than Section 15.1; and

                    (ii) all remaining assets of the Company shall be
                         distributed to the Members as follows:

                         1.  the Liquidator may sell any or all Company
                             property, including to one or more of the Members
                             (other than any Member in Default at the time of
                             dissolution), provided (x) any such sale to a
                             Member is made on an arms length basis under terms
                             which are in the best interest of the Company and
                             (y) to the extent that any Member has participated
                             in an Expansion Option under Section 15.2, the
                             Liquidator shall hire an independent consultant to
                             attribute (on the basis of the then existing fair
                             market value) the proceeds from the sale of the
                             Company property between each respective Expansion
                             Project, and all other assets of the Company (such
                             value for each respective Expansion Project the
                             "Expansion Liquidation Value") and the Liquidator
                             shall repay any Members' Expansion Option loan
                             pursuant to Section 15.2(e), but only to the
                             extent that there is any Expansion Liquidation
                             Value allocated to the corresponding Expansion
                             Project;

                        2.   with respect to all Company property that has not
                             been sold, the fair market value of that property
                             (as determined by the Liquidator using any method
                             of valuation as it, using its best judgment, deems
                             reasonable) shall be determined and the Capital
                             Accounts of the Members shall be adjusted to
                             reflect the manner in which the unrealized income,
                             gain, loss, and deduction inherent in property
                             that has not been reflected in the Capital
                             Accounts previously would be allocated among the
                             Members if there were a taxable disposition of
                             that property for the fair market value of that
                             property on the date of distribution; and

                        3.   Company property shall be distributed among the
                             Members ratably in proportion to each Member's
                             Capital Account


                                       54
<PAGE>   60


                             balances, as determined after taking into account
                             all Capital Account adjustments for the taxable
                             year of the Company during which the liquidation
                             of the Company occurs (other than those made by
                             reason of this clause (C)).

                    All distributions in kind to the Members shall be made
               subject to the liability of each distributee for costs, expenses,
               and liabilities theretofore incurred or for which the Company has
               committed prior to the date of termination and those costs,
               expenses, and liabilities shall be allocated to the distributee
               pursuant to this Section 12.2. The distribution of cash and/or
               property to a Member in accordance with the provisions of this
               Section 12.2 constitutes a complete return to the Member of its
               Capital Contributions and a complete distribution to the Member
               of its Membership Interest and all the Company's property.

         12.3. Provision for Contingent Claims.

               (a) The Liquidator shall make a reasonable provision to pay all
               claims and obligations, including all contingent, conditional or
               unmatured claims and obligations, actually known to the Company
               but for which the identity of the claimant is unknown; and

               (b) If there are insufficient assets to both pay the creditors
               pursuant to Section 12.2(c)(i) and to establish the provision
               contemplated by Section 12.3(a), the claims shall be paid as
               provided for in accordance to their priority, and, among claims
               of equal priority, ratably to the extent of assets therefor.

         12.4. Deficit Capital Accounts. Notwithstanding anything to the
contrary contained in this Agreement, and notwithstanding any custom or rule of
law to the contrary, a deficit, if any, in the Capital Account of any Member
upon the dissolution and winding up of the Company shall not be an asset of the
Company and no such Member shall be obligated to contribute any amounts to the
Company to bring the balance of such Member's capital account to zero.

                                  ARTICLE XIII.

                           AMENDMENT OF THE AGREEMENT

         13.1. Amendments to be Adopted by the Company. Each Member agrees that
the appropriate officer of the Company, in accordance with and subject to the
limitations contained in Article VII, may execute, swear to, acknowledge,
deliver, file and record whatever documents may be required to reflect:

               (a) a change in the name of the Company, the location of the
               principal place of business of the Company or the registered
               agent or office of the Company;

               (b) admission or substitution of Members effected in accordance
               with this Agreement;


                                       55
<PAGE>   61


               (c) a change that the Members believe is reasonable and necessary
               or appropriate to qualify or continue the qualification of the
               Company as a limited liability company under the Laws of any
               state or that is necessary or advisable in the opinion of the
               Company to ensure that the Company will not be taxable as a
               corporation or otherwise taxed as an entity for federal income
               tax purposes;

               (d) a change that is necessary or appropriate for the Company to
               satisfy any requirements, conditions, guidelines or
               interpretations contained in any opinion, interpretative release,
               directive, order, ruling or regulation of any federal or state
               agency or judicial authority (including, without limitation, the
               Act);

               (e) an amendment that is necessary, in the opinion of counsel, to
               prevent the Company or its officers from in any manner being
               subjected to the provisions of the Investment Company Act of
               1940, as amended, or "plan asset" regulations adopted under the
               Employee Retirement Income Security Act of 1974, as amended,
               whether or not substantially similar to plan asset regulations
               currently applied or proposed by the United States Department of
               Labor; and

               (f) subject to the terms of Section 3.8, an amendment that the
               Company determines in its sole discretion to be necessary or
               appropriate in connection with the authorization for issuance of
               any Membership Interest pursuant to Section 3.8.

         13.2. Amendment Procedures. Except as provided in Section 13.1, all
amendments to this Agreement shall be made in accordance with the following
requirements. Amendments to this Agreement may be proposed by any Member. Each
such proposal shall contain the text of the proposed amendment. If an amendment
is proposed, the Company shall seek the written approval of the holders of the
requisite percentage of Membership Interests or call a meeting of the Members to
consider and vote on such proposed amendment. A proposed amendment shall be
effective upon its approval by the holders of all of the Membership Interests,
unless a different percentage is expressly required under this Agreement. Any
amendment that would materially and adversely affect the rights of any type or
class of Membership Interests in relation to other types or classes of
Membership Interests requires the approval of the holders of at least a majority
of the Membership Interests of such class or type of Membership Interest. The
Company shall notify all Record Holders upon final adoption of any proposed
amendment.

                                  ARTICLE XIV.

                        CERTIFICATED MEMBERSHIP INTERESTS

         14.1. Entitlement to Certificates. Every owner of a Membership Interest
in the Company, unless and to the extent the Company elects otherwise, shall be
entitled to have a certificate, in such form as is approved by the Company and
conforms with applicable law, certifying the Membership Interest owned by it.

         14.2. Multiple Classes of Interest. If the Company shall be authorized
to issue more than one class of Membership Interest or more than one series of
any Membership Interest, a statement of the powers, designations, preferences
and relative, participating, optional or other


                                       56
<PAGE>   62


special rights of each class of membership interest or series thereof and the
qualification, limitations or restrictions of such preferences and/or rights
shall, unless the Members shall by resolution provide that such class or series
of Membership Interest shall be uncertificated, be set forth in full or
summarized on the face or back of the certificate which the Company shall issue
to represent such class or series of Membership Interest; provided that, to the
extent allowed by law, in lieu of such statement, the face or back of such
certificate may state that the Company will furnish a copy of such statement
without charge to each requesting Member.

         14.3. Signatures. Each certificate representing a Membership Interest
in the Company shall be signed by or in the name of the Company by (1) the
President or any Vice President of the Company and (2) the Treasurer, any
Assistant Treasurer, the Secretary or any Assistant Secretary of the Company.
The signature of the officers of the Company may be facsimiles. In case any
officer who has signed or whose facsimile signature has been placed upon a
certificate shall have ceased to hold such office before such certificate is
issued, it may be issued by the Company with the same effect as if he held such
office on the date of issue.

         14.4. Issuance and Payment. Subject to the provisions of the Act and
this Agreement, including, without limitation, Section 3.8, Membership Interests
may be issued for such consideration and to such persons as the Company may
determine from time to time.

         14.5. Restrictive Legend. In the absence of a more restrictive legend,
all certificates which evidence Membership Interests shall be stamped or typed
in a conspicuous place with the following legend:

               THE INTEREST REPRESENTED BY THIS CERTIFICATE IS SUBJECT TO THE
               LIMITED LIABILITY AGREEMENT OF THE COMPANY DATED AS OF
               [__________ __], 1999, AS IT EXISTS FROM TIME TO TIME, WHICH
               RESTRICTS ANY SALE, ASSIGNMENT, TRANSFER, CONVEYANCE,
               ENCUMBRANCE, PLEDGE OR OTHER TRANSFER OR ALIENATION (WITH OR
               WITHOUT CONSIDERATION) OF SUCH INTEREST. THE COMPANY WILL FURNISH
               TO THE RECORD HOLDER OF THIS CERTIFICATE, WITHOUT CHARGE, UPON
               WRITTEN REQUEST TO THE COMPANY AT ITS PRINCIPAL PLACE OF
               BUSINESS, A COPY OF SUCH LIMITED LIABILITY AGREEMENT. THE
               SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE BEEN ACQUIRED FOR
               INVESTMENT AND HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT
               OF 1933, AS AMENDED, OR THE SECURITIES LAWS OF ANY STATE. WITHOUT
               SUCH REGISTRATION, SUCH SECURITIES MAY NOT BE SOLD, ASSIGNED,
               TRANSFERRED, CONVEYED, PLEDGED, HYPOTHECATED, OR OTHERWISE
               TRANSFERRED, EXCEPT UPON DELIVERY TO THE COMPANY OF AN OPINION OF
               COUNSEL SATISFACTORY TO THE COMPANY THAT SUCH REGISTRATION IS NOT
               REQUIRED FOR SUCH TRANSFER.


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<PAGE>   63


         Such legend shall also be placed on all Certificates which are
hereafter issued to any Member.

         14.6. Lost, Stolen or Destroyed Certificates. The Company may direct a
new certificate or certificates to be issued in place of any certificate or
certificates theretofore issued by the Company alleged to have been lost, stolen
or destroyed upon the making of an affidavit of that fact by the Person claiming
the certificate of stock to be lost, stolen or destroyed. When authorizing such
issue of a new certificate or certificates, the Company may, in its discretion
and as a condition precedent to the issuance thereof, require the owner of such
lost, stolen or destroyed certificate or certificates, or his legal
representative, to advertise the same in such manner as it shall require and/or
to give the Company a bond in such sum as it may direct as indemnity against any
claim that may be made against the Company with respect to the certificate
alleged to have been lost, stolen or destroyed.

         14.7. Transfer of Membership Interest. Upon surrender to the Company or
its transfer agent, if any, of a certificate representing Membership Interests
duly endorsed or accompanied by proper evidence of succession, assignation or
authority to Transfer in accordance with this Agreement and of the payment of
all taxes applicable to the Transfer of said Membership Interest, the Company
shall be obligated to issue a new certificate to the Person entitled thereto,
cancel the old certificate and record the transaction upon its books, provided,
however, that the Company shall not be so obligated unless such Transfer was
made in compliance with the provisions of this Agreement and any applicable
state and federal Laws.

         14.8. Registered Holders. The Company shall be entitled to recognize
the exclusive right of a Person registered on its books as the owner of the
indicated Membership Interest and shall not be bound to recognize any equitable
or other claim to or interest in such Membership Interest on the part of any
Person other than such registered owner, whether or not it shall have express or
other notice thereof, except as otherwise provided by Law.

                                   ARTICLE XV.

                     OTHER MEMBER AGREEMENTS AND OBLIGATIONS

         15.1. Lateral Opportunities.

               (a) Limitation on Lateral Opportunities. Except as otherwise
               provided in this Section 15.1(a), no constituent of the Tejas
               Pipeline Companies or Leviathan Gas Pipeline Companies will,
               directly or indirectly, enter into any agreement to construct or
               otherwise consummate transactions involving construction of any
               Lateral in which such constituent would own an interest (a
               "Lateral Opportunity") until such Lateral Opportunity has been
               rejected or otherwise forfeited by the Company. Any constituent
               of the Tejas Pipeline Companies or Leviathan Gas Pipeline
               Companies may enter into an agreement, which may be amended from
               time to time, with their respective Affiliates involving a
               Lateral Opportunity and, if applicable, the terms and conditions
               of such agreement or agreements will be offered to the Company
               pursuant to the terms and conditions of Section 15.1(b).


                                       58
<PAGE>   64


               (b) Delivery of Lateral Opportunity Notice. Any Member may
               propose that the Company undertake a Lateral Opportunity by
               delivering written notice (a "Lateral Opportunity Notice") to the
               Company and each of the Members. (A) A Lateral Opportunity Notice
               involving the connection solely of third party production shall
               include the proposed terms and conditions of such transactions,
               which terms shall, at minimum, (x) reflect an arm's length
               transaction on reasonably fair terms, independent of any other
               transaction, and (y) be no less favorable to the Company than the
               Lateral Opportunity offered to such Member. The Lateral
               Opportunity Notice shall also contain reasonably sufficient
               operational and financial information and other details to allow
               the Members to make a reasonably informed decision with respect
               to such Lateral Opportunity. Such Lateral Opportunity Notice
               shall (i) state whether such Lateral Opportunity is, directly or
               indirectly, related in any way to any past, current, or
               contemplated transaction involving the Member delivering such
               notice (including its Affiliates), (ii) contain a statement, if
               true, that the Member is not aware of any undisclosed benefits
               expected to accrue to the Member or its Affiliates as a result of
               such Lateral Opportunity or, if the delivering Member is unable
               to make such statement, the notice shall disclose the existence,
               but not the details of such other benefits, and (iii) contain
               only financial projections prepared in good faith based upon
               assumptions relating to such Lateral Opportunity believed by the
               Member to be reasonable. (B) A Lateral Opportunity Notice
               involving the connection of any production of a Member or its
               Affiliates that must be offered to the Company under the terms of
               Section 15.1(a) shall include the proposed terms and conditions
               of such transactions, which terms shall be no less favorable to
               the Company than the Lateral Opportunity offered to such Member.
               The Lateral Opportunity Notice shall also contain reasonably
               sufficient operational and financial information and other
               details to allow the Members to make a reasonably informed
               decision with respect to such Lateral Opportunity.

               (c) Rejected Lateral Opportunities. If the Company does not vote
               to accept the Lateral Opportunity and deliver notice accordingly
               in writing within 30 days after the Company receives the Lateral
               Opportunity Notice that the Company should undertake such project
               on the terms and conditions set forth in the applicable Lateral
               Opportunity Notice, then the Member (and/or its Affiliates) who
               provided and voted in favor of the Lateral Opportunity Notice
               shall have the right to pursue such project (a "Rejected Lateral
               Opportunity") on the terms and conditions set forth in the
               applicable Lateral Opportunity Notice and own any assets related
               thereto. In such event, the Member who provided the relevant
               Lateral Opportunity Notice (and/or its Affiliates) shall be free
               for a period of 120 days to enter into definitive agreements, if
               any, or otherwise consummate the transactions contemplated by the
               applicable Lateral Opportunity Notice on the same terms and
               conditions set forth in the applicable Lateral Opportunity Notice
               without further obligation to any Members or the Company;
               provided that following such 120 day period, such Member or its
               Affiliates may not enter into definitive agreements, if any, or
               otherwise consummate the transactions with respect to a Rejected
               Lateral Opportunity without again offering the same to the
               Company in accordance with this Article. No Member shall have any
               obligation


                                       59
<PAGE>   65


               or duty to the Company or the other Members with respect to any
               Rejected Lateral Opportunity to the extent it is covered by
               definitive agreements entered into, or otherwise consummated, by
               such Member or its Affiliates after compliance with this Section
               15.1 or with respect to any modification, renewal or extension of
               the terms of such definitive agreements with respect to any such
               Rejected Lateral Opportunity. Except as set forth in this Section
               15.1, the construction, acquisition, operation, maintenance and
               ownership of each such Rejected Lateral Opportunity project shall
               not be governed or affected by this Agreement.

         15.2. Expansion Option.

               (a) Any Member (the "Exercising Member") shall have the right to
               require the Company to construct, own and operate a particular
               Expansion Project (the "Expansion Option") if (i) (x) the
               Exercising Member or an Affiliate of the Exercising Member has
               delivered to the other Member (the "Responding Member") written
               notice (the "Capacity Request") requesting firm capacity on the
               Brutus Gathering Facilities to gather or transport gas (including
               gas which is not owned by the Exercising Member or its Affiliate)
               from one or more Dedicated Leases or from leases that the
               Exercising Member or an Affiliate desires to dedicate under the
               Gathering Agreement or (y) a third party requests (a "Third Party
               Capacity Request") either additional firm capacity under an
               existing gathering agreement and/or firm capacity under a newly
               proposed gathering agreement (the properties in (x) and (y) above
               to be hereinafter referred to as "Expansion Property") to the
               extent that the expected volume (including increases in volume
               from existing properties dedicated pursuant to the Gathering
               Agreement or any other gathering agreement of which some or all
               of the volumes could be Accelerated Volumes of production from
               the Expansion Property ("Expansion Property Production"), at the
               time of such notice, is not being delivered into the Brutus
               Gathering Facilities, (ii) the Members determine in good faith
               that the Accessible Capacity is not sufficient practically to
               handle substantially all of the Expansion Property Production,
               (iii) the Members determine in good faith that the relevant
               Expansion Project is necessary to increase the Base Capacity to a
               level adequate to allow the Brutus Gathering Facilities to handle
               the Expansion Property Production, (iv) within 60 days from the
               latest date on which the Responding Member has the right to
               respond to the Capacity Request or the Third Party Capacity
               Request, whichever is applicable (the "Expansion Option Period"),
               the Members have held a meeting and the Responding Member has
               voted against the relevant Expansion Project, (v) the Exercising
               Member voted in favor of the relevant Expansion Project at such
               meeting, and (vi) the Expansion Option is exercised in accordance
               with the requirements of Section 15.2(b) below.

               (b) Exercise. The Exercising Member shall exercise the Expansion
               Option by delivering, at any time after such Expansion Project
               has been rejected by the Responding Member but before the end of
               the Expansion Option Period, written notice of such exercise (the
               "Expansion Option Notice") to the Company and each


                                       60
<PAGE>   66


               Responding Member. Whenever an Exercising Member delivers an
               Expansion Option Notice, every other Member which voted in favor
               of the relevant Expansion Project at the last meeting during
               which such project was voted on (together with the Exercising
               Member, the "Expansion Participants") shall have the right to
               participate, proportionately based on the relationship of its
               Membership Interest to the Membership Interests of all of the
               Expansion Participants, in such project on the same basis as the
               Exercising Member, including the right to receive the Payout
               Amount out of 80% of the Expanded Capacity Revenues and the
               obligation to fund such project. Any Member which desires to
               exercise its right to participate in such project must deliver to
               the other Members a notice substantially similar to that
               delivered by the original Exercising Member in accordance with
               the terms of this subsection, within 30 days after it receives
               the Expansion Option Notice. Each Expansion Participant shall
               provide to the other Expansion Participants and the Company an
               irrevocable commitment timely to fund the relevant Expansion
               Project and, if appropriate, assurances reasonably satisfactory
               to the Company and the other Expansion Participants that the
               relevant Expansion Participant has the ability to fund such
               Expansion Project; provided, however, that no such additional
               assurances will be required of Tejas Holding or Leviathan Holding
               as long as their respective funding obligations are subject to a
               parent-company guaranty. If any Expansion Participant pays any
               amount to the Company in excess of the amount needed to fund the
               Expansion Project, the Company shall immediately return such
               excess amount to the Expansion Participant.

               (c) Repayment. Until the Expansion Participants have (i) received
               payment with respect to 100% of the Expanded Capacity Revenues in
               an amount equal to the Payout Amount or (ii) the Company, by a
               unanimous vote of all Members (notwithstanding any provision to
               the contrary herein) other than the Expansion Participants, has
               otherwise paid the unamortized portion of the Payout Amount to
               the Expansion Participants as described below, the Expansion
               Participants shall be paid monthly amounts equal to 80% of the
               Expanded Capacity Revenues. Such amounts shall be allocated among
               the Expansion Participants in the proportions that the Membership
               Interest of each such Expansion Participant bears to the
               Membership Interests of all such Expansion Participants. The
               remaining 20% of the Expanded Capacity Revenues shall be retained
               by the Company and allocated to all of the Members in accordance
               with Sections 5.1 and 5.2. After recovery of the Payout Amount or
               payment by the Company of the unamortized portion of the Payout
               Amount to the Expansion Participants as described below, all of
               the Expansion Capacity Revenues shall be retained by the Company
               and allocated to all of the Members based on their respective
               Membership Interests. If, at any time, the Company, by a
               unanimous vote of all Members other than the Expansion
               Participants, elects to prepay the unamortized amount of the
               Payout Amount, the Company shall promptly pay an amount equal to
               the then-remaining unpaid principal amount of the Payout Amount
               to the Expansion Participants, which remaining unpaid principal
               amount shall be calculated by treating as principal payments
               10/15 of all amounts received by the Expansion Participants prior
               to such time in satisfaction of the Payout Amount.


                                       61
<PAGE>   67


               (d) Capacity. Prior to proceeding with any Expansion Project in
               accordance with this Section, all of the Members shall cooperate
               to establish (i) the Accessible Capacity, using the lesser of (x)
               the maximum approved operating pressure, (y) the then existing
               contractual operating pressure or (z) the maximum physical
               pressure at which the line can operate, in each case determined
               at the inlet of each relevant point of receipt and the pressure
               (averaged over the last three months) at the relevant points of
               delivery and (ii) an expansion design to handle the Expansion
               Property Production. If the Members cannot agree on any such
               matter, the Company shall engage an independent consultant (of
               national prominence with experience in the relevant geographical
               area) to resolve each such matter.

               (e) Treatment as Loan. Any amount paid by one or more Members
               pursuant to Section 15.2 shall be considered to be a limited
               recourse, partially secured loan from the advancing Members to
               the Company, with such loan payable only from, and secured only
               by a security interest granted by the Company in, 80% of the
               Expanded Capacity Revenues until such loan is paid in full.
               Except for such security interest in 80% of the Expanded Capacity
               Revenues, such loan shall be without recourse against the
               Company. The Company shall have no obligation to repay such loan
               other than to the extent that 80% of the Expanded Capacity
               Revenues are available.

                                  ARTICLE XVI.

                               GENERAL PROVISIONS

         16.1. Offset. Whenever the Company is to pay any sum under this
Agreement to any Member, any amounts that a Member owes the Company may be
deducted from that sum before payment.

         16.2. Entire Agreement; Supersedure. This Agreement constitutes the
entire agreement and supersedes (a) all prior oral or written proposals or
agreements (b) all contemporaneous oral proposals or agreements and (c) all
previous negotiations and all other communications or understandings between the
Parties with respect to the subject matter hereof including, without limitation,
the Confidentiality Agreement dated July 15, 1998, between the Members, et al.

         16.3. Waivers. Neither action taken (including, without limitation, any
investigation by or on behalf of any Party) nor inaction pursuant to this
Agreement, shall be deemed to constitute a waiver of compliance with any
representation, warranty, covenant or agreement contained herein by the Party
not committing such action or inaction. A waiver by any Party of a particular
right, including, without limitation, breach of any provision of this Agreement,
shall not operate or be construed as a subsequent waiver of that same right or a
waiver of any other right.

         16.4. Binding Effect. This Agreement shall be binding upon and inure to
the benefit of the Members and their respective heirs, legal representatives,
successors and assigns.

         16.5. Member Deadlocks; Negotiations and Mediation.


                                       62
<PAGE>   68


               (a) Member Deadlocks. Except for any matter or proposal covered
               by the immediately succeeding sentence, Member approval or
               disapproval of any matter shall not be subject to the provisions
               of this Section 16.5. If any matter or proposal covered by
               Sections 6.3(b)(i)-(iv) or relating to an operating budget
               described in Section 6.3(b)(v), requiring the vote of less than
               all of the Membership Interest for approval thereof is brought
               before the Members and receives neither (x) at least the Required
               Interest voting for such matter or proposal nor (y) at least the
               Required Interest voting against (not including abstentions or
               other non-votes) such matter or proposal, then any Member, by
               written notice to the other Members given within three Business
               Days after the initial vote on such matter or proposal, may call
               a meeting of the Members to reconsider such matter or proposal,
               such meeting to be held when, where and as reasonably specified
               in said notice, but not less than three Business Days nor more
               than seven Business Days after the date of such vote. If such
               meeting is called and held as herein provided and the matter or
               proposal is offered at such meeting again and (x) does not
               receive at least the Required Interest voting for such matter or
               proposal or (y) does not receive at least the Required Interest
               voting against (not including abstentions or other non-votes)
               such matter or proposal, then any Member may within three
               Business Days thereafter submit the matter to further
               negotiation, and, if applicable, non-binding mediation, in
               accordance with this Section 16.5. If no Member calls such a
               meeting within the first three Business Day period herein
               provided for or if further negotiation is not requested within
               the three Business Day period after the second meeting, no Member
               shall thereafter have any right to request further negotiation or
               non-binding mediation regarding such matter or proposal.

               (b) Further Negotiation. Any Member wishing to submit a matter or
               proposal to further negotiation as permitted above or pursuant to
               Section 16.8 shall do so by giving written notice of further
               negotiation to the other Members containing a brief description
               of the nature of the dispute to be further negotiated and the
               position of the Member initiating further negotiation. Upon
               receipt of such notice, each Member shall appoint a
               representative for such further negotiations, which
               representative shall hold a position with the Person owning such
               Member of equal or superior status to the prior representative of
               such Member with respect to the proposal in question. The
               respective representatives shall meet at the principal office of
               the Company at 10:00 a.m. local time on the third Business Day
               after the date of receiving the notice of further negotiations.

               (c) Non-Binding Mediation. If within ten Business Days following
               initial receipt by the Members of the notice of further
               negotiations neither (x) at least the Required Interest votes for
               such matter or proposal nor (y) at least the Required Interest
               votes against (not including abstentions or other non-votes) such
               matter or proposal, then any Member may subject the matter or
               proposal to non-binding mediation by giving written notice of
               mediation to the other Members within five Business Days
               thereafter. The notice of mediation shall state the identity of
               the single mediator selected by the Member initiating mediation
               and contain a detailed statement of the nature of the dispute to
               be mediated and the remedy or


                                       63
<PAGE>   69


               resolution sought by the Member initiating mediation. Neither the
               Members nor the mediator will have the right to conduct any
               further discovery relating to such mediation. The Member or
               Members initiating mediation shall pay the fees of the mediator;
               provided, however, that if the vote of the Members changes as a
               result of such mediation, then the Company shall pay all such
               fees and each of the Members' costs related to such mediation.
               Unless otherwise agreed by all of the Members, the mediation
               proceedings shall be held in Houston, Texas at such location
               selected by the mediator and shall begin as soon as practicable,
               but not less than five Business Days following the mailing of the
               initiating Member's notice of mediation. If within five Business
               Days following initiation of mediation proceedings neither (x) at
               least the Required Interest votes for such matter or proposal nor
               (y) at least the Required Interest votes against (not including
               abstentions or other non-votes) such matter or proposal, then
               such mediation shall terminate and such matter or proposal will
               no longer be subject to further negotiation or mediation. Except
               with respect to the matters expressly specified in Section
               16.5(a) and Section 16.8, no Member shall have the right to
               demand mediation with respect to any dispute, difference or
               question arising between any of the Members themselves or any
               Member and the Company.

         16.6. Governing Law; Severability.

               (a) THIS AGREEMENT HAS BEEN EXECUTED AND DELIVERED AND SHALL BE
               CONSTRUED, INTERPRETED AND GOVERNED PURSUANT TO AND IN ACCORDANCE
               WITH THE LAWS OF THE STATE OF DELAWARE, WITHOUT REGARD TO ANY
               CONFLICT OF LAWS PRINCIPLES WHICH, IF APPLIED, MIGHT PERMIT OR
               REQUIRE THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION.

               (b) In the event of a direct conflict between the provisions of
               this Agreement and any mandatory provision of the Act or
               applicable Laws, the applicable provision of the Act or other
               applicable Laws, as the case may be, shall control. If any
               provision of this Agreement, or the application thereof to any
               Person or circumstance, is held invalid or unenforceable to any
               extent, the remainder of this Agreement and the application of
               that provision to other Persons or circumstances shall not be
               affected thereby and that provision shall be enforced to the
               greatest extent permitted by the Act or other applicable Laws, as
               the case may be.

         16.7. Further Assurances. Subject to the terms and conditions set forth
in this Agreement, each of the Parties agrees to use all reasonable efforts to
take, or to cause to be taken, all actions, and to do, or to cause to be done,
all things necessary, proper or advisable under applicable Laws and regulations
to consummate and make effective the transactions contemplated by this
Agreement. In case, at any time after the execution of this Agreement, any
further action is necessary or desirable to carry out its purposes, the proper
officers or directors of the Parties shall take or cause to be taken all such
necessary action.

         16.8. Exercise of Certain Rights. No Member may maintain any action for
partition of the property of the Company. No Member may maintain any action for
dissolution and


                                       64
<PAGE>   70


liquidation of the Company unless such Member has submitted the dispute giving
rise to such possible action to further negotiation and non-binding mediation,
which further negotiation and mediation shall be conducted in accordance with
the time periods and procedures set forth in Section 16.5(b) and (c), to the
extent applicable. If such dispute is still unresolved after the conclusion of
such further negotiation and non-binding mediation, such Member shall offer to
sell its Membership Interest (free and clear of all liens and encumbrances) to
the other Members for an amount of cash equal to the fair market value of the
selling Member's Membership Interest, determined by multiplying such selling
Member's Membership Interest by the fair market value of the Company, as a
whole, without regard to any discounts or premiums related to minority interest,
controlling interest, liquidity or related matters. If such Members do not agree
on the fair market value thereof, such value shall be determined by an
arbitrator in accordance with the arbitration procedures set forth in Section
3.5(d). If the non-selling Members do not exercise the option to purchase such
Membership Interest within 60 days after the fair market value is determined,
then the selling Member shall have the right for a period of 30 days after such
60-day period to initiate an action for such dissolution and liquidation
pursuant to section 18-802 of the Act or any similar applicable statutory or
common law dissolution right. If no Member has brought such action for
dissolution within such 30 day period, then any Member may maintain an action
for dissolution and liquidation only after again following the procedures set
forth in this Section 16.8. Upon the institution of, and during the pendency of,
any such dissolution proceeding, the Members agree to use commercially
reasonable efforts to employ procedures and experts to ensure that such
dissolution process will result in the Company and/or its assets being disposed
of at fair market value; provided that such cooperative efforts shall not
constitute a waiver or limitation of any such Member's right to contest such
dissolution. Such procedures shall include soliciting likely potential
purchasers, establishing a data room and other information sharing procedures
and, if appropriate, engaging an investment banker, consultant or other expert
to facilitate and enhance the marketing efforts. The terms and conditions of
this Section 16.8 are intended to preserve any right to dissolution created by
statute or common law (such as by section 18-802 of the Act), but do not create
any contractual right to dissolution.

         16.9. Notice to Members of Provisions of this Agreement. By executing
this Agreement, each Member acknowledges that it has actual notice of all of the
provisions of this Agreement. Each Member hereby agrees that this Agreement
constitutes adequate notice of all such provisions.

         16.10. Counterparts. This Agreement may be executed in multiple
counterparts, each of which, when executed, shall be deemed an original, and all
of which shall constitute but one and the same instrument.

         16.11. Attendance via Communications Equipment. Unless otherwise
restricted by law or this Agreement, the Members or committees may hold meetings
by means of telephone conference or other communications equipment by means of
which all Persons participating in the meeting can effectively communicate with
each other. Such participation in a meeting shall constitute presence in person
at the meeting, except where a Person participates in the meeting for the
express purpose of objecting to the transaction of any business on the ground
that the meeting is not lawfully called or convened.


                                       65
<PAGE>   71


         16.12. Reports to Members. The officers of the Company shall present at
each annual meeting of Members, and at any special meeting of Members, a
statement of the business and condition of the Company.

         16.13. Checks, Notes and Contracts. Checks and other orders for the
payment of money shall be signed by such Person or Persons as the Company shall
from time to time by resolution determine. Contracts and other instruments or
documents may be signed in the name of the Company by any Person or Persons as
the Company shall from time to time by resolution determine, authorized to sign
such contract, instrument or document by the Company, and such authority may be
general or confined to specific instances. Checks and other orders for the
payment of money made payable to the Company may be endorsed for deposit to the
credit of the Company, with a depositary authorized by resolution of the
Company, by the Chief Financial Officer or Treasurer or such other Persons as
the Company may from time to time by resolution determine.

         16.14. Seal. The seal of the Company shall be in such form as shall
from time to time be adopted by the Company. The seal may be used by causing it
or a facsimile thereof to be impressed, affixed or otherwise reproduced.

         16.15. Books and Records. The officers of the Company shall keep
correct and complete books and records of account, including the names and
addresses of all Members and the number and class of the interest held by each,
and minutes of the proceedings of the Members at its registered office or
principal place of business, or at the office of its transfer agent or
registrar.

         16.16. Surety Bonds. Such officers and agents of the Company (if any)
as the Company may direct, from time to time, shall be bonded for the faithful
performance of their duties and for the restoration to the Company, in case of
their death, resignation, retirement, disqualification or removal from office,
of all books, papers, vouchers, money and other property of whatever kind in
their possession or under their control belonging to the Company, in such
amounts and by such surety companies as the Company may determine. The premiums
on such bonds shall be paid by the Company and the bonds so furnished shall be
in the custody of the Secretary.

         16.17. Audit Rights of Members.

               (a) Each Member shall have the right to inspect and audit the
               books and records of the Company to the extent necessary to
               determine the accuracy of the financial statements delivered to
               the Members pursuant to Section 10.2 of this Agreement. Such
               audits shall be conducted at the cost of the Member(s) requesting
               same. The audit rights with respect to any calendar year or any
               portion of such year shall terminate on and as of the last day of
               the second calendar year immediately following the year in
               question. A Member may exercise its audit rights hereunder by
               giving at least 30 days written notice to the Company of the
               desire to perform such audit, which notice shall include the
               estimated timing and other particulars related to such audit. The
               audit shall be conducted during normal business hours of the
               Company. The audit shall not unreasonably interfere with the
               operation of the Company. If any financial statement is not
               challenged within 3 years, then it shall be presumed to be
               accurate.


                                       66
<PAGE>   72


               (b) Any Member shall have the right to cause the Company or a
               Subsidiary of the Company to exercise its inspection and audit
               rights, if any, under any Construction Agreement or Operating
               Agreement. The costs related thereto shall be paid by the
               Member(s) requesting same.

         16.18. No Third Party Beneficiaries. Except to the extent a third party
is expressly given rights herein, any agreement herein contained, expressed or
implied, shall be only for the benefit of the Parties and their respective legal
representatives, successors, and assigns, and such agreements shall not inure to
the benefit of any other Person whomsoever, it being the intention of the
parties hereto that no Person shall be deemed a third party beneficiary of this
Agreement except to the extent a third party is expressly given rights herein.

         16.19. Notices. Except as otherwise expressly provided in this
Agreement to the contrary (including in the definition of the term Default), any
notice required or permitted to be given under this Agreement shall be in
writing (including telex, facsimile, telecopier or similar writing) and sent to
the address of the Party set forth below, or to such other more recent address
of which the sending Party actually has received written notice:

               (a) if to the Company, to:


               (b) if to the Members, to each of the Members listed on Exhibit A
               at the address set forth therein.

Each such notice, demand or other communication shall be effective, if given by
registered or certified mail, return receipt requested, as of the third day
after the date indicated on the mailing certificate, or if given by any other
means, when delivered at the address specified in this Section 16.19.

         16.20. Remedies. Except as expressly provided herein, the rights,
obligations and remedies created by this Agreement are cumulative and in
addition to any other rights, obligations or remedies otherwise available at law
or in equity. Other than the obligation to arbitrate pursuant to Section 16.21,
in lieu of seeking judicial remedies, nothing herein shall be considered an
election of remedies. In addition, any successful Party is entitled to costs
related to enforcing this Agreement, including, without limitation, attorneys'
fees, and arbitration expenses. NOTWITHSTANDING ANYTHING TO THE CONTRARY, THE
PARTIES WAIVE ANY AND ALL RIGHTS, CLAIMS OR CAUSES OF ACTION ARISING UNDER THIS
AGREEMENT FOR INCIDENTAL, CONSEQUENTIAL, PUNITIVE OR EXEMPLARY DAMAGES. A PARTY
MAY RECOVER FROM THE OTHER PARTY ALL COSTS, EXPENSES OR DAMAGES INCLUDING,
WITHOUT LIMITATION, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL, EXEMPLARY,
PUNITIVE AND DAMAGES PAID OR OWED TO ANY THIRD PARTY FOR WHICH SUCH PARTY HAS A
RIGHT TO RECOVER FROM THE OTHER PARTY.

         16.21. Disputes.

               (a) Applicability. Any controversy or claim, whether based on
               contract, tort, statute or other legal or equitable theory
               (including but not limited to any claim of


                                       67
<PAGE>   73


               fraud, misrepresentation or fraudulent inducement or any question
               of validity or effect of this Agreement including this clause)
               arising out of or related to this Agreement (including any
               amendments or extensions), or the breach or termination thereof
               shall be settled by arbitration in accordance with the then
               current CPR Institute Rules for Non-Administered Arbitration of
               Business Disputes, and this provision. The arbitration shall be
               governed by the United States Arbitration Act, 9 U.S.C. Sections
               1-16 to the exclusion of any provision of Law inconsistent
               therewith or which would produce a different result, and judgment
               upon the award rendered by the arbitrator may be entered by any
               court having jurisdiction. Notwithstanding the foregoing, this
               Section 16.21 shall not apply to (x) any matters that, pursuant
               to the provisions of this Agreement, are to be resolved by a vote
               of the Members or (y) any of the rights of non-defaulting Members
               set forth in Section 4.3. Any dispute to which this Section 16.21
               applies is referred to herein as a "Dispute." With respect to a
               particular Dispute, each Person that is a party to such Dispute
               is referred to herein as a "Disputing Party." The provisions of
               this Section 16.21 shall be the exclusive method of resolving
               Disputes.

               (b) Negotiation to Resolve Disputes. If a Dispute arises, the
               Disputing Parties shall attempt to resolve such Dispute through
               the following procedure:

                    (i)   first, each of the Disputing Parties shall promptly
                          meet (whether by phone or in person) in a good faith
                          attempt to resolve the Dispute.

                    (ii)  second, if the Dispute is still unresolved after ten
                          Business Days following the commencement of the
                          negotiations described in Section 16.21(b)(i), then
                          the chief executive officer (or his designee) of the
                          direct parent of each Disputing Party shall meet
                          (whether by phone or in person) in a good faith
                          attempt to resolve the Dispute; and

                    (iii) third, if the Dispute is still unresolved after ten
                          Business Days following the commencement of the
                          negotiations described in Section 16.21(b)(ii), then
                          any Disputing Party may submit such Dispute to binding
                          arbitration under this Section 16.21 by written notice
                          to the other Disputing Parties (an "Arbitration
                          Notice") delivered within thirty Business Days
                          thereafter.

                    (iv)  At the same time that the Disputing Member sends an
                          Arbitration Notice to the other Disputing Members, it
                          shall also send an Arbitration Notice to the regional
                          office of the CPR Institute covering Houston, Texas.
                          The Arbitration Notice shall contain a brief
                          description of the nature of the dispute and the name
                          of an Arbitrator proposed by the Disputing Member.


                                       68
<PAGE>   74


               (c) Selection of Arbitrator.

                    (i)  Any arbitration conducted under this Section 16.21
                         shall be heard by a sole arbitrator (the "Arbitrator")
                         qualified by his or her education, experience and
                         training to resolve the disputed matters and shall be
                         selected in accordance with this Section 16.21. Each
                         Disputing Party and each proposed Arbitrator shall
                         disclose to the other Disputing Parties any business,
                         personal or other relationship or affiliation that may
                         exist between such Disputing Party and such proposed
                         Arbitrator within ten Business Days following delivery
                         of the Arbitration Notice.

                    (ii) The Disputing Party that submits a Dispute to
                         arbitration shall designate a proposed Arbitrator in
                         its Arbitration Notice. If any other Disputing Party
                         objects for any reason to such proposed Arbitrator, it
                         may, on or before the tenth Business Day following
                         delivery of the Arbitration Notice, notify all of the
                         other Disputing Parties of such objection. All of the
                         Disputing Parties shall attempt to agree upon a
                         mutually acceptable Arbitrator. If they are unable to
                         do so within seven Business Days following delivery of
                         the notice described in the immediately-preceding
                         sentence, any Disputing Party may request the regional
                         office of the CPR Institute covering Houston, Texas to
                         designate the Arbitrator who shall be qualified by his
                         or her education, experience and training to resolve
                         the disputed matters. Failing designation by the
                         regional office of the CPR Institute covering Houston,
                         Texas, any Disputing Party may in writing request the
                         judge of the United States District Court for the
                         Southern District of Texas senior in term of service to
                         appoint an Arbitrator qualified by his or her
                         education, experience and training to resolve the
                         disputed matters. If the Arbitrator so chosen shall
                         die, resign or otherwise fail or becomes unable to
                         serve as Arbitrator, a replacement Arbitrator shall be
                         chosen in accordance with this Section 16.21(c).

               (d) Conduct of Arbitration.

                    (i)  Any arbitration hearing shall be held in Houston,
                         Texas. The Arbitrator shall fix a reasonable time and
                         place for the hearing and shall determine the matters
                         submitted to it pursuant to the provisions of this
                         Agreement in a timely manner; provided, however, if the
                         Arbitrator shall fail to hold the hearing to determine
                         the issue in dispute within sixty (60) days after the
                         selection of the Arbitrator, then any Disputing Member
                         shall have the right to require a new Arbitrator be
                         selected under Section 16.21(c).

                    (ii) Except as expressly provided to the contrary in this
                         Agreement, the Arbitrator shall have the power (i) to
                         gather such materials, information, testimony and
                         evidence as it deems relevant to the


                                       69
<PAGE>   75


                         dispute before it (and each member will provide such
                         materials, information, testimony and evidence
                         requested by the Arbitrator, except to the extent any
                         information so requested is, subject to an
                         attorney-client or other privilege); (ii) to grant
                         injunctive relief and enforce specific performance; and
                         (iii) to issue or cause to be issued subpoenas
                         (including subpoenas directed to third-parties) for the
                         attendance of witnesses and for the production of
                         books, records, documents and other evidence. Subpoenas
                         so issued shall be served, and upon application to the
                         Court by a party or the Arbitrator, enforced, in the
                         manner provided by law for the service and enforcement
                         of subpoenas in a civil action; and (iv) to administer
                         oaths.

                   (iii) In advance of the arbitration hearing, the Disputing
                         Members may conduct discovery in accordance with the
                         Texas Rules of Civil Procedure. Such discovery may
                         include, but is not limited to, 1) the taking of oral
                         and videotaped depositions and depositions on written
                         questions; 2) serving interrogatories, document
                         requests and requests for admission; and 3) any other
                         form and/or method of discovery provided for under the
                         Texas Rules of Civil Procedure. The Arbitrator shall
                         order the parties to promptly exchange copies of all
                         exhibits and witness lists, and, if requested by a
                         party, to produce other relevant documents, to answer
                         up to ten interrogatories (including subparts), to
                         respond to up to ten requests for admissions (which
                         shall be deemed admitted if not denied) and to produce
                         for deposition and, if requested, at the hearing all
                         witnesses that such party has listed and up to four
                         other persons within such party's control. Any
                         additional discovery shall only occur by agreement of
                         the parties or as ordered by the Arbitrator upon a
                         finding of good cause. Any objections and/or responses
                         to such discovery shall be due on or before fifteen
                         (15) days after service. The Disputing Members shall
                         attempt in good faith to resolve any discovery disputes
                         that may arise. If the Disputing Members are unable to
                         resolve any such disputes, the Disputing Members may
                         present their objections to the Arbitrator who shall
                         resolve the objections in accordance with the Texas
                         Rules of Civil Procedure. The Arbitrator may, if
                         requested by a party, order that a trade secret or
                         other confidential research, development or commercial
                         information not be revealed or be revealed only in a
                         designated way.

                    (iv) The Disputing Members may also retain, with the consent
                         of the arbitrator, one or more experts to assist the
                         Arbitrator in resolving the Dispute. The Disputing
                         Members shall identify and produce a report from any
                         experts who will give testimony and/or evidence at the
                         arbitration hearing. Any testifying experts identified
                         shall be made


                                       70
<PAGE>   76


                         available for deposition in advance of any arbitration
                         hearing.

                    (v)  The Arbitrator shall render its decision in writing
                         within fifteen (15) days of the conclusion of the
                         hearing. The arbitrator shall have jurisdiction and
                         authority to interpret and apply the provisions of this
                         Agreement only insofar as shall be necessary in the
                         determination of the dispute before it, but it shall
                         not have jurisdiction or authority to add to or alter
                         in any way the provisions of this Agreement. The
                         Arbitrator's decision shall govern and shall be final,
                         nonappealable (except to the extent provided in the
                         Federal Arbitration Act) and binding on the Disputing
                         Members hereto and its written decision may be entered
                         in any court having appropriate jurisdiction. Pending
                         resolution of any dispute hereunder, performance by
                         Disputing Members shall continue so as to maintain the
                         status quo prior to notice of such dispute and service
                         of notice of arbitration by any Disputing Member shall
                         not divest a court of competent jurisdiction of the
                         right and power to grant a decree compelling specific
                         performance or injunctive relief in an action brought
                         by the Disputing Members. THE ARBITRATOR AND ANY COURT
                         ENFORCING THE AWARD OF THE ARBITRATOR SHALL NOT HAVE
                         THE RIGHT OR AUTHORITY TO AWARD CONSEQUENTIAL,
                         INCIDENTAL, INDIRECT, SPECIAL, PUNITIVE OR EXEMPLARY
                         DAMAGES TO THE COMPANY OR ANY DISPUTING MEMBERS.
                         PROVIDED, HOWEVER, THAT THE ARBITRATOR MAY AWARD ALL
                         COSTS, EXPENSES OR DAMAGES INCLUDING, WITHOUT
                         LIMITATION, INDIRECT, SPECIAL, CONSEQUENTIAL,
                         INCIDENTAL, EXEMPLARY, PUNITIVE AND OTHER DAMAGES PAID
                         OR OWED TO ANY THIRD PARTY FOR WHICH A PARTY HAS A
                         RIGHT TO RECOVER FROM THE OTHER PARTY.

                    (vi) The responsibility for paying the costs and expenses of
                         the arbitration, including compensation to the
                         Arbitrator, shall be allocated among the Disputing
                         Members in a manner determined by the Arbitrator to be
                         fair and reasonable under the circumstances. Each
                         Disputing Member shall be responsible for the fees and
                         expenses of its respective counsel, consultants and
                         witnesses, unless the Arbitrator determines that
                         compelling reasons exist for allocating all or a
                         portion of such costs and expenses to one or more other
                         Disputing Members.

         16.22. Member Trademarks. Neither the Company nor any Member shall be
permitted to use any trademark owned by any other Member or its Affiliates ,
including, without limitation, the Shell "Pecten" trademark, without the express
written consent of such Member or its Affiliates or as otherwise required by
Law.


                                       71
<PAGE>   77


         16.23. Holding-Out. Except as required by Law, the Company shall not
publicly indicate that it is affiliated with Shell Oil Company or any of its
Affiliates , without the express written consent of Tejas Holding or an
Affiliate thereof.


              [THE REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]







                                       72
<PAGE>   78


         IN WITNESS WHEREOF, the Members have executed this Agreement as of the
date first set forth in this Agreement.

                                    MEMBERS:

                                    MORAY PIPELINE COMPANY, L.L.C.



                                    By: /s/ JAMES H. LYTAL
                                        ----------------------------------------
                                    Printed Name: James H. Lytal
                                                  ------------------------------
                                    Title: President
                                           -------------------------------------



                                    TEJAS OFFSHORE PIPELINE, LLC





                                    By: /s/ V. W. DEMARIA
                                        ----------------------------------------
                                    Printed Name: V. W. DeMaria
                                                  ------------------------------
                                    Title: Vice President
                                           -------------------------------------



EXHIBITS:

Exhibit A:        Ownership Information

Exhibit B:        Description of Initial Facilities

Exhibit C:        Insurance

Exhibit D:        Sample Calculation of IRR





                                       73
<PAGE>   79




                                    EXHIBIT A

                              Ownership Information

<TABLE>
<CAPTION>
- -------------------------------------------- ------------------ ----------------------
            NAME AND INITIAL CAPITAL          INITIAL CAPITAL    MEMBERSHIP INTEREST
           CONTRIBUTION OF EACH MEMBER         CONTRIBUTIONS
- -------------------------------------------- ------------------ ----------------------
<S>                                          <C>                <C>
1)   Leviathan Holding:                             (1)                33.92%
     Moray Pipeline Company, L.L.C.
     Attention:  Grant E. Sims
     1001 Louisiana
     Houston, Texas  77002
     Telephone: 713/420-2131
     Facsimile:   713/420-5602

- -------------------------------------------- ------------------ ----------------------
2)   Tejas Holding (3)                              (2)                66.08%
     Tejas Offshore Pipeline, LLC
     Attention: Mr. Doug Krenz, President
     1221 Lamar, Suite 600
     Houston, Texas 77010
     Telephone:  713/230-3000
     Facsimile:   713/230-3140

- -------------------------------------------- ------------------ ----------------------
</TABLE>

(1) Leviathan Holding shall make or cause to be made Initial Capital
Contributions equal to:

     (a)  Contributions of [_______________ ] due by [______________ ], 1999
          which is equal to the amount of cash paid by Leviathan Holding on
          behalf of the Company for certain costs and expenses related to the
          formation of the Company and incurred by Leviathan Holding prior to
          the date hereof.
     (b)  Contributions of cash pursuant to Section 4.1(b) of this Agreement, in
          the amount of [_________________] due by [__________________], 1999.

(2) Tejas Holding shall make or cause to be made Initial Capital Contributions
equal to:

     (a)  Contributions of [________________] due by [___________________], 1999
          which is equal to the amount of cash paid by Tejas Holding on behalf
          of the Company for certain costs and expenses related to the formation
          of the Company and incurred by Tejas Holding prior to the date hereof.
          [UNDER CONSIDERATION BY TEJAS]

     (b)  Contributions of cash pursuant to Section 4.1(b) of this Agreement, in
          the amount of [_________________] due by [__________________], 1999.
          [UNDER CONSIDERATION BY TEJAS]

(3) Initial Tax Matters Member.



                                      A-1
<PAGE>   80



                                    EXHIBIT B

                               Initial Facilities

1.   18-inch pipeline approximately 23.4 miles in length running from Green
     Canyon Block 158 to Ship Shoal Block 332 platform.

2.   A meter station and pig launcher and associated communications equipment
     located on the Brutus Tension-Leg Platform in Green Canyon Block 158.

3.   A pig receiver and related control valves and piping located on the Manta
     Ray Gathering Co., L.L.C. owned platform in Ship Shoal Block 332.






                                      B-1
<PAGE>   81



                                    EXHIBIT C

                                    INSURANCE

<TABLE>
<CAPTION>
                                                           Per Occurrence    Per Occurrence
                              Coverage                  imit of Liability1     Deductible

<S>                                                      <C>                <C>
I.   Each Member shall carry its proportionate share of the insurance in I.A.
     through C, in amounts equal to its Membership Interest, for its own benefit
     and the benefit of the Company. All deductible amounts shall be paid by the
     Company:

     A.  Physical Damage:                                                   $1,000,000
         1.    a.  Pipelines                             $   20,000,000
               b.  Junction Platform
                   (S.S. 207)                            $   15,000,000
         2.    Line Pack                                 $      500,000
         3.    Equipment                                 $   10,000,000
         4.    Cargo                                     $    1,000,000
     B.  Primary and Excess Liability including          $  200,000,000     $1,000,000
         Pollution liability
     C.  Non-Owned Aircraft Liability                    $   10,000,000       None
II.  To be carried by the Company, if applicable:
     A.  Workers' Compensation                           Per statute          $250,000
         Employers Liability/Maritime E.L.               $    1,000,000       $250,000
     B.  Automobile Liability                            $    1,000,000     $1,000,000
     C.  Builder's Risk2
         1.    Brutus Gathering Facilities               Project Value        $250,000

III. If the Company owns or bareboat charters watercraft these coverages will be
     carried by the Company:

     A.  Hull/Machinery, Including Collision Liability   $   10,000,000      $250,000
     B.  Protection & Indemnity, including crew          $    1,000,000      $250,000
            coverage and Excess Collision Liability
</TABLE>


             [REVISED COVERAGE AMOUNTS STILL UNDER REVIEW BY TEJAS]




- ------------------------------------
1    Each Member shall have the right to self-insure for an amount equal to the
     retention under their respective corporate insurance program, subject to a
     limit of $20,000,000.

2    Builders Risk insurance or self-insurance may be provided by the Company in
     the form as reflected in the attached Builders Risk Specimen Policy.


                                      C-1
<PAGE>   82



                                    EXHIBIT D

                            Sample Calculation of IRR

<TABLE>
<CAPTION>
                                        1998         1999        2000         2001         2002         2003         2004
                                      --------     --------    --------     --------     --------     --------     --------
<S>                                   <C>          <C>         <C>          <C>          <C>          <C>          <C>
Assumptions (in thousands)
CAPITAL INVESTMENT                       1,000        8,344      28,956
VOLUME/RATES
Number of days                                                                   365          365          365          365


Shell Deepwater-MMCF per day                                                     160          160          160          160
Shell Deepwater-Rate per MMCF                                               $   0.19     $   0.19     $   0.19     $   0.19
                                                                            --------     --------     --------     --------
Shell Deepwater-Revenue-$M                                                  $ 11,096     $ 11,096     $ 11,096     $ 11,096
                                                                            --------     --------     --------     --------

Third parties - MMCF per day                                                       0            0            0            0
Third parties - Rater per MMCF                                              $   0.00     $   0.00     $   0.00     $   0.00
                                                                            --------     --------     --------     --------
Shell Deepwater - Revenue - $M                                              $      0     $      0     $      0     $      0
                                                                            --------     --------     --------     --------

OPERATING COSTS                                                             $    913     $    940     $    968     $    997
OVERHEAD COSTS                                                              $    120     $    124     $    127     $    131


TAX DEPRECIATION                                                            $ 38,300     $ 38,300     $ 38,300     $ 38,300
Investment                                                                     14.29%       24.49%       17.49%       12.49%
                                                                            --------     --------     --------     --------
7-year tax rates using MACRS                                                   5,473     $  9,380     $  6,699     $  4,784
                                                                            --------     --------     --------     --------


INCOME TAXES
Gross revenue                                                               $ 11,096     $ 11,096     $ 11,096     $ 11,096
Operating expenses                                                            (1,033)      (1,064)      (1,095)      (1,128)
Depreciation                                                                  (5,473)      (9,380)      (6,699)      (4,784)
                                                                            --------     --------     --------     --------
                                                                               4,590          652        3,302        5,184
Income tax rate                                                                   35%          35%          35%          35%
                                                                            --------     --------     --------     --------
Income taxes                                                                $  1,606     $    228     $  1,156     $  1,815


CALCULATION OF IRR DATE
Gross revenue                         $      0     $      0    $      0     $ 11,096     $ 11,096     $ 11,096     $ 11,096
Operating expenses                           0            0           0       (1,033)      (1,064)      (1,095)      (1,128)
Income taxes                                 0            0           0       (1,606)        (228)      (1,156)      (1,815)
Investment in Initial Facilities        (1,000)      (8,344)    (28,956)           0            0            0            0
                                      --------     --------    --------     --------     --------     --------     --------
   After tax cash flow                ($ 1,000)    ($ 8,344)   ($28,956)    $  8,457     $  9,804     $  8,845     $  8,153
                                      --------     --------    --------     --------     --------     --------     --------

Interal rate or return by                                                     (72.97)%     (33.56)%     (13.88)%      (2.96)%
year sing after tax cash flow

<CAPTION>
                                        2005        2006        2007        2008        2009        2010
                                      --------    --------    --------    --------    --------    --------
ASSUMPTIONS (IN THOUSANDS)
CAPITAL INVESTMENT
VOLUME/RATES
Number of days                             365         365         365         365         365         365


Shell Deepwater-MMCF per day               155         135         125         110          75          25
Shell Deepwater-Rate per MMCF         $   0.19    $   0.19    $   0.19    $   0.19    $   0.19    $   0.19
                                      --------    --------    --------    --------    --------    --------
Shell Deepwater-Revenue-$M            $ 10,749    $  9,362    $  8,669    $  7,629    $  5,201    $  1,734
                                      --------    --------    --------    --------    --------    --------

Third parties - MMCF per day                50          50         100         100         100         100
Third parties - Rater per MMCF        $   0.10    $   0.10    $   0.10    $   0.10    $   0.10    $   0.10
                                      --------    --------    --------    --------    --------    --------
Shell Deepwater - Revenue - $M        $  1,825       $1825    $  3,650    $  3,650    $  3,650    $  3,650
                                      --------    --------    --------    --------    --------    --------

OPERATING COSTS                       $  1,027    $  1,058    $  1,090    $  1,123    $  1,156    $  1,191
OVERHEAD COSTS                        $    135    $    139    $    143    $    148    $    152    $    157


TAX DEPRECIATION                      $ 38,300    $ 38,300    $ 38,300    $ 38,300    $ 38,300    $ 38,300
Investment                                8.93%       8.92%       8.93%       4.46%       0.00%       0.00%
                                      --------    --------    --------    --------    --------    --------
7-year tax rates using MACRS          $  3,420    $  3,416    $  3,420    $  1,708    $      0    $      0
                                      --------    --------    --------    --------    --------    --------


INCOME TAXES
Gross revenue                         $ 12,574    $ 11,187    $ 12,319    $ 11,279    $  8,851    $ 55,384
Operating expenses                      (1,162)     (1,197)     (1,233)     (1,271)     (1,308)     (1,348)
Depreciation                            (3,420)     (3,416)     (3,420)     (1,708)          0           0
                                      --------    --------    --------    --------    --------    --------
                                         7,992       6,574       6,666       8,299       6,543       4,036
Income tax rate                             35%         35%         35%         35%         35%
                                      --------    --------    --------    --------    --------    --------
Income taxes                          $  2,797    $  2,301    $  2,683    $  2,905    $  2,640    $  1,413


CALCULATION OF IRR DATE
Gross revenue                         $ 12,574    $ 11,187    $ 12,319    $ 11,279    $  8,851    $  5,384
Operating expenses                      (1,162)     (1,197)     (1,233)     (1,271)     (1,308)     (1,348)
Income taxes                            (2,797)     (2,301)     (2,683)     (2,905)     (2,640)     (1,413)
Investment in Initial Facilities             0           0           0           0           0           0
                                      --------    --------    --------    --------    --------    --------
   After tax cash flow                $  8,615    $  7,689    $  8,403    $  7,103    $  4,903    $  2,623
                                      --------    --------    --------    --------    --------    --------

Interal rate or return by                 4.33%       8.65%      11.90%      13.87%      14.90%      15.34%
year sing after tax cash flow
</TABLE>

<PAGE>   1

                                                                   EXHIBIT 10.18


                       LIMITED LIABILITY COMPANY AGREEMENT

                                       OF

                           DEEPWATER HOLDINGS, L.L.C.

                                   JUNE 1999

<PAGE>   2


                                TABLE OF CONTENTS

<TABLE>
<S>                                                                                   <C>
DEFINITIONS.............................................................................2

ARTICLE I FORMATION.....................................................................7

ARTICLE II NAME.........................................................................7

ARTICLE III PURPOSE.....................................................................7

ARTICLE IV NAMES AND ADDRESSES OF MEMBERS AND PRINCIPAL OFFICE OF COMPANY...............7

ARTICLE V REGISTERED AGENT; REGISTERED OFFICE; ADDITIONAL OFFICES.......................8

ARTICLE VI TERM.........................................................................8

ARTICLE VII CAPITAL CONTRIBUTIONS; SHARING RATIOS; CAPITAL ACCOUNTS.....................8
         Section 7.1       Initial Capital Contributions................................8
         Section 7.2       Incremental Expansion Capital Contributions..................8
         Section 7.3       Subsequent Contributions.....................................9
         Section 7.4       Requests For Capital Contributions...........................9
         Section 7.5       Delinquent Member............................................9
         Section 7.6       Return of Capital Contributions.............................10
         Section 7.7       Capital Accounts............................................11
         Section 7.8       Adjustment of 704(b) Capital Accounts 704(b)................11
         Section 7.9       GAAP Capital Accounts and Financial Reporting...............11

ARTICLE VIII DISTRIBUTIONS.............................................................11
         Section 8.1       Distributions...............................................11

ARTICLE IX ALLOCATIONS OF INCOME, GAIN, LOSS, DEDUCTION AND CREDIT FOR TAX PURPOSES....12
         Section 9.1       General.....................................................12
         Section 9.2       [Intentionally omitted].....................................12
         Section 9.3       Income Tax Allocations......................................12
         Section 9.4       Allocations on Transfers....................................13
         Section 9.5       Reliance on Advisors........................................13
         Section 9.6       Tax Matters Member..........................................13

ARTICLE X BOOKS OF ACCOUNT, RECORDS, REPORTS AND TAX INFORMATION.......................14
         Section 10.1      Books and Records...........................................14
         Section 10.2      Financial Information.......................................14
         Section 10.3      Audits......................................................15
</TABLE>


                                       i
<PAGE>   3


<TABLE>
<S>                                                                                   <C>
         Section 10.4      Inspection of Facilities and Records........................15
         Section 10.5      Budgets.....................................................15

ARTICLE XI FISCAL YEAR.................................................................15

ARTICLE XII COMPANY FUNDS..............................................................16

ARTICLE XIII STATUS OF MEMBERS.........................................................16

ARTICLE XIV MANAGEMENT AND OPERATION OF BUSINESS.......................................16
         Section 14.1      Member Management...........................................16
         Section 14.2      Management Committee........................................16
         Section 14.3      Exculpation.................................................20
         Section 14.4      Indemnification.............................................21
         Section 14.5      Officers....................................................22
         Section 14.6      Management Committee Deadlocks..............................23
         Section 14.7      Initiation of Proceedings...................................24
         Section 14.8      Responses...................................................24
         Section 14.9      Selection of Arbitrators....................................24
         Section 14.10     Location....................................................25
         Section 14.11     Rules.......................................................25
         Section 14.12     Limitations on Arbitration..................................25
         Section 14.13     Effect of Award.............................................25
         Section 14.14     Company Administration......................................25

ARTICLE XV MANAGEMENT OF OPERATING SUBSIDIARIES........................................26
         Section 15.1      Operating Subsidiary Management Committees..................26

ARTICLE XVI DISPOSITIONS AND ENCUMBRANCES OF MEMBERSHIP INTERESTS......................26
         Section 16.1      Dispositions and Encumbrances of Membership Interests.......26
         Section 16.2      Permitted Dispositions and Encumbrances.....................27

ARTICLE XVII RESIGNATION, BANKRUPTCY, ETC..............................................27
         Section 17.1      Covenant Not to Withdraw....................................27
         Section 17.2      Affected Member.............................................27

ARTICLE XVIII DISSOLUTION OF THE COMPANY...............................................29

ARTICLE XIX WINDING UP AND TERMINATION OF THE COMPANY..................................29
         Section 19.1      Liquidator..................................................29
         Section 19.2      Reserves....................................................30
         Section 19.3      Liquidation Distributions...................................30
         Section 19.4      Accounting..................................................30
         Section 19.5      Only Recourse to Company Assets.............................30
         Section 19.6      Termination.................................................30
</TABLE>


                                       ii

<PAGE>   4


<TABLE>
<S>                                                                                   <C>
ARTICLE XX NOTICES.....................................................................31

ARTICLE XXI AMENDMENT OF AGREEMENT.....................................................31

ARTICLE XXII REPRESENTATIONS, WARRANTIES AND COVENANTS.................................31

ARTICLE XXIII MISCELLANEOUS............................................................31
         Section 23.1      No Partition................................................31
         Section 23.2      Entire Agreement............................................31
         Section 23.3      Governing Law...............................................32
         Section 23.4      Binding Effect..............................................32
         Section 23.5      Context.....................................................32
         Section 23.6      Captions....................................................32
         Section 23.7      Effect of Invalid Provision.................................32
         Section 23.8      Counterpart Execution.......................................32
         Section 23.9      Laws and Regulatory Bodies..................................32
         Section 23.10     Business Opportunity........................................33
         Section 23.11     Entitlement to Certificates.................................33


EXHIBIT A: Sharing Ratios of the Members
</TABLE>


                                      iii
<PAGE>   5


                       LIMITED LIABILITY COMPANY AGREEMENT
                                       OF
                           DEEPWATER HOLDINGS, L.L.C.

         THIS LIMITED LIABILITY COMPANY AGREEMENT is made as of September 30,
1999, between and among AMERICAN NATURAL OFFSHORE COMPANY, a Delaware
corporation ("American Offshore"), TEXAS OFFSHORE PIPELINE SYSTEM, INC., a
Delaware corporation ("TOPSI"), UNITEX OFFSHORE TRANSMISSION COMPANY, a Delaware
corporation ("Unitex"), ANR WESTERN GULF HOLDINGS, L.L.C., a Delaware limited
liability company ("ANR LLC" and, together with American Offshore, TOPSI, and
Unitex, the "ANR Subs") and Leviathan Deepwater, L.L.C., a Delaware limited
liability company ("Leviathan Deepwater").

         WHEREAS, ANR Pipeline Company, a Delaware corporation ("ANR") is the
parent, directly or indirectly, of the ANR Subs and Leviathan Gas Pipeline
Partners, L.P., a Delaware limited partnership ("Leviathan"), is the parent of
Leviathan Deepwater;

         WHEREAS, the ANR Subs, Stingray Holding, L.L.C., a Delaware limited
liability company ("SHLLC"), Green Canyon Pipe Line Company, L.L.C., a Delaware
limited liability company ("Green Canyon"), UTOS Holding, L.L.C., a Delaware
limited liability company ("UTOS Holding"), Natoco, L.L.C., a Delaware limited
liability company ("Natoco"), Transco Offshore Pipeline Company, L.L.C., a
Delaware limited liability company ("TOPC"), Transco Hydrocarbons Company,
L.L.C., a Delaware limited liability company ("THC"), Texam Offshore Gas
Transmission, L.L.C. ("TOGT," and collectively with UTOS Holding, Natoco, THC,
and TOPC, the "LEV Subs") owned, collectively, all of the membership interests
in Western Gulf Holdings, L.L.C., a Delaware limited liability company ("Western
Gulf"), Stingray Pipeline Company L.L.C., a Delaware limited liability company
("Stingray"), U-T Offshore System L.L.C., a Delaware limited liability company
("UTOS"), and West Cameron Dehydration Company L.L.C., a Delaware limited
liability company ("WCDC," and together with Western Gulf, UTOS, Stingray and
WCDC, the "Contributed Entities");

         WHEREAS, the ANR Subs, the LEV Subs, Green Canyon and SHLLC contributed
all of their interests in the Contributed Entities to the Company;

         WHEREAS, immediately following the contribution, the LEV Subs merged
with and into SHLLC, Green Canyon distributed its Membership Interest (herein
defined) to Leviathan and Leviathan contributed this Membership Interest to
SHLLC, and SHLLC changed its name to "Leviathan Deepwater, L.L.C.";

         WHEREAS, immediately following the merger of the LEV Subs, ANR LLC
purchased a 9.66% membership interest in the Company from Leviathan Deepwater;
and

         WHEREAS, the Company will own and operate the Contributed Entities and
any entities owned by the Contributed Entities.

         NOW, THEREFORE, in consideration of the premises and the mutual
undertakings contained herein, the parties hereto hereby set forth the terms for
the Company's Limited Liability Company Agreement as follows:



                                       1
<PAGE>   6

                                   DEFINITIONS

         The following definitions shall be Applicable to the terms set forth
below as used in this Agreement:

         "704(b) Capital Account": A 704(b) Capital Account shall be established
for each Member and shall initially be equal to the agreed upon fair market
value of each Member's interest and shall be maintained in accordance with the
requirements of Treasury Regulations under Section 704(b) of the Code.

         "AAA" means American Arbitration Association.

         "Act" means the Delaware Limited Liability Company Act, 6 Del. Code
Sections 18-101 et seq., as it may be amended from time to time, and any
successor to said Act.

         "Administrative Agreement" has the meaning given that term in Section
14.14.

         "Administrator" means the Person selected by the Members, or by the
Management Committee from time to time, in accordance with Section 14.14.

         "Affected Member" has the meaning given that term in Section 17.2.

         "Affiliate" means, with respect to any Person, a Person that directly,
or indirectly through one or more intermediaries, Controls, is Controlled by, or
is under common Control with such first Person, where "Control" (including its
derivatives) means the power to direct management or policies, whether pursuant
to the ownership of voting interest, by contract or otherwise; provided that the
Company and its subsidiaries shall not be deemed to be an Affiliate of any
Member or any of their respective Affiliates and vice versa.

         "Agreed Value" means, in the case of any contributions or distributions
of property, the fair market value of such property net of any indebtedness or
other liability either assumed or to which such property is subject, as such
fair market value is determined by the Management Committee using such
reasonable method of valuation as it may adopt.

         "Agreement" means this Limited Liability Company Agreement, as the same
may be amended, modified or restated from time to time.

         "Alternate Representatives" have the meaning given such term in
Section 14.2(a).

         "American Offshore" has the meaning given that term in the preamble.

         "ANR" has the meaning given that term in the preamble.

         "ANR LLC" has the meaning given that term in the preamble.

         "ANR Subs" has the meaning given that term in the preamble.


                                       2
<PAGE>   7


         "Bankrupt Member" means any Member with respect to which an event of
the type described in Section 18-304 of the Act has occurred, subject to the
lapsing of any period of time therein specified.

         "Built-In Gain" with respect to any Company property means (i) the
excess of the Agreed Value of any Contributed Property over its adjusted basis
for federal income tax purposes as of the time of contribution and (ii) in the
case of any adjustment to the Carrying Value of any Company property subject to
depreciation, cost recovery or amortization pursuant to Section 7.8 as a result
of a contribution of cash for a Membership Interest, the Unrealized Gain with
respect to such property.

         "Built-in Loss" with respect to any Company property means (i) the
excess of its adjusted basis for federal income tax purposes of any Contributed
Property over its Agreed Value as of the time of contribution and (ii) in the
case of any adjustment to the Carrying Value of any Company property subject to
depreciation, cost recovery or amortization pursuant to Section 7.8 as a result
of a contribution of cash for a Membership Interest, the Unrealized Loss with
respect to such property.

         "Business Day" means any day other than a Saturday, Sunday or bank
holiday in Texas.

         "Capital Accounts" means the 704(b) Capital Accounts, the GAAP Capital
Accounts and the Sharing Capital Accounts.

         "Capital Contributions" means the Agreed Value of any property and the
amount of cash contributed to the Company.

         "Carrying Value" with respect to any Capital Contribution recording in
a 704(b) Capital Account means the Agreed Value of such property reduced as of
the time of determination by all book depreciation, cost recovery and
amortization deductions charged to the 704(b) Capital Account with respect to
such property and an appropriate amount to reflect any sales, retirements or
other dispositions of assets included in such property and, with respect to any
other Company property, the adjusted basis of such property for federal income
tax purposes as of the time of determination. The Carrying Value shall be
further adjusted as provided in Section 7.8.

         "Certificate" means the Certificate of Formation filed in the Office of
the Secretary of State of the State of Delaware pursuant to the Act and any
amendment or restatement thereof.

         "Certified Public Accountants" means such nationally recognized firm of
independent public accountants as may be selected from time to time by the
Management Committee.

         "Code" means the Internal Revenue Code of 1986, as amended and in
effect on the effective date hereof and, to the extent applicable, as
subsequently amended.

         "Company" means Deepwater Holdings, L.L.C., the limited liability
company entered into and formed pursuant to this Agreement and the Act.

         "Contributed Entities" has the meaning given that term in the preamble.


                                       3
<PAGE>   8


         "Contributed Property" means any Capital Contribution of property other
than cash.

         "Contributing Member(s)" has the meaning given that term in Section
7.5(c).

         "Contribution Basis" has the meaning given that term in Section 7.9.

         "Control" (including its derivatives) has the meaning given such term
in the definition of "Affiliate."

         "Default Interest Rate" means a floating rate per annum equal to the
lesser of (i) two percent (2%) over the interest rate publicly quoted by
Citibank N.A. from time to time as its prime commercial rate, with adjustments
in such varying rate to be made on the same day as any change in the aforesaid
rate or (ii) the maximum rate permitted under applicable law; provided that the
Default Interest Rate shall never be less than two percent (2%) over the London
Inter Bank Offer Rate.

         "Delinquent Member" has the meaning given that term in Section 7.5.

         "Dispose," "Disposing" or "Disposition" means, with respect to a
Membership Interest or any portion thereof, a sale, assignment, transfer,
conveyance, gift, exchange or other disposition of such Membership Interest or
portion thereof.

         "Disposing Member" means a Member desiring to Dispose of its Membership
Interest.

         "Distributable Cash" means, at the time of determination, all Company
cash other than (i) reserves for working capital and (ii) other amounts that the
Management Committee reasonably determines to be necessary for the proper
operation of the Company's business and its winding up and liquidation.

         "East Breaks" means East Breaks Gathering Company, L.L.C., a Delaware
limited liability company.

         "Encumber," "Encumbering" or "Encumbrance" means the creation of a
security interest, lien, pledge, mortgage or other encumbrance, whether such
encumbrance be voluntary, involuntary or by operation of law.

         "Excess" the meaning given that term in Section 7.9.

         "Formation Date" means the date the Company is formed as provided in
Article I.

         "GAAP Capital Account": A GAAP Capital Account shall be established for
each Member based on the Initial Balances as determined pursuant to Section
7.1(b) hereof, and shall be maintained in accordance with generally accepted
accounting principles, but giving effect to each Member's disproportionate
depreciation, as provided in Section 7.9.

         "Green Canyon" has the meaning given that term in the preamble.


                                       4
<PAGE>   9


         "HIOS" means High Island Offshore System, L.L.C., a Delaware limited
liability company.

         "Incremental Expansion Capital Contribution" has the meaning given in
Section 7.2.

         "Indemnitee" has the meaning given that term in Section 14.4.

         "Initial Balances" has the meaning given that term in Section 7.1(b).

         "Interest" has the meaning given that term in Section 17.2(a).

         "Initial Capital Contributions" has the meaning given that term in
Section 7.1(a).

         "Lending Member(s)" has the meaning given that term in Section 7.5(b).

         "LEV Subs" has the meaning given that term in the preamble.

         "Leviathan" has the meaning given that term in the preamble.

         "Leviathan Deepwater" has the meaning given that term in the preamble.

         "Liquidator" has the meaning given that term in Section 19.1.

         "LOC" means Leviathan Operating Company, L.L.C., a Delaware limited
liability company.

         "Majority in Interests" means, subject to Section 14.2(a)(iii), Sharing
Ratios aggregating greater than 50% of all the Sharing Ratios of the Members
whose Representatives are entitled to vote on a particular Management Committee
matter.

         "Management Committee" has the meaning given that term in Section 14.1.

         "Members" means ANR Subs and Leviathan Deepwater or their respective
successors and assigns and "Member" means any one of them.

         "Membership Interest" as to any Member means the entire ownership
interest and rights of that Member in the Company, including, without
limitation, the rights to vote and receive a proportional amount of any
distributions.

         "Natoco" has the meaning given that term in the preamble.

         "Operating Subsidiary" means each of the Contributed Entities, HIOS and
East Breaks and each other Person, if any, Controlled by and owned (directly or
indirectly) more than 50% by the Company.

         "Other Members" has the meaning given that term in Section 17.2(a).

         "Person" means an individual, corporation, voluntary association, joint
stock company, business trust, partnership, limited liability company or other
entity.


                                       5
<PAGE>   10


         "Representatives" has the meaning given that term in Section 14.2(a).

         "Sharing Capital Account": A Sharing Capital Account shall be
established for each Member and shall be equal to the product of (x) the sum of
the Members' Initial Balances, times (y) each Members' Sharing Ratio and shall
be maintained in accordance with generally accepted accounting principles
without regard to the provisions of this Agreement dealing with each Member's
disproportionate depreciation, as provided in Section 7.9.

         "Sharing Ratio" means the percentages set forth in Exhibit A, as
adjusted from time to time as provided herein.

         "SHLLC" has the meaning given that term in the preamble.

         "Stingray" has the meaning given that term in the preamble.

         "Subsidiary Companies" has the meaning given that term in the preamble.

         "Subsidiary Management Committee" means the management committee of any
Operating Subsidiary.

         "Subsidiary System" means the pipeline and related facilities owned by
an Operating Subsidiary, and any other pipelines and related facilities
constructed, purchased or otherwise acquired by an Operating Subsidiary in
accordance with the constitutive documents of such Operating Subsidiary.

         "THC" has the meaning given that term in the preamble.

         "TMM" has the meaning given such term in Section 9.5.

         "TOGT" has the meaning given that term in the preamble.

         "TOPC" has the meaning given that term in the preamble.

         "TOPSI" has the meaning given that term in the preamble.

         "Unitex" has the meaning given that term in the preamble.

         "Unrealized Gain" attributable to Company property means, as of the
date of determination, the excess of the fair market value of such property as
of such date of determination over the Carrying Value of such property as of
such date of determination.

         "Unrealized Loss" attributable to Company property means, as of the
date of such determination, the excess of the Carrying Value of such property as
of such date of determination over the fair market value of such property as of
such date of determination.

         "UTOS" has the meaning given that term in the preamble.

         "UTOS Holding" has the meaning given that term in the preamble.


                                       6
<PAGE>   11


         "WCDC" has the meaning given that term in the preamble.

         "Western Gulf" has the meaning given that term in the preamble.

                                    ARTICLE I
                                    FORMATION

         The parties hereto form the Company as a limited liability company
pursuant to the Act. The rights and liabilities of the Members shall be as
provided in the Act, except as herein otherwise expressly provided. The
Membership Interests of any Member shall be personal property for all purposes.
On the request of the Management Committee, each Member shall execute,
acknowledge, swear to and deliver all certificates and other instruments
conforming with this Agreement that are necessary to qualify, continue or
terminate the Company as a limited liability company under the laws of the State
of Delaware and to qualify the Company to do business in such other states and
jurisdictions where such qualification is necessary or desirable.

                                   ARTICLE II
                                      NAME

         The name of the Company shall be, and the business of the Company shall
be conducted under the name of, Deepwater Holdings, L.L.C. or such other name or
names that comply with applicable law as the Management Committee may designate
from time to time. The Management Committee shall take any action that it
determines is required to comply with the Act, assumed name act, fictitious name
act or similar statute in effect in each jurisdiction or political subdivision
in which the Company proposes to do business and the Members agree to execute
any documents requested by the Management Committee in connection with any such
action.

                                   ARTICLE III
                                     PURPOSE

         The purposes of the Company are to own and operate the Operating
Subsidiaries, which own and operate the Subsidiary Systems, and to acquire,
construct, own and operate (directly or through Operating Subsidiaries) any
other natural gas pipeline and related assets in accordance with the terms of
this Agreement. Except for activities related to such purposes, there are no
other authorized business purposes of the Company. The Company shall not engage
in any activity or conduct inconsistent with such purposes.

                                   ARTICLE IV
                       NAMES AND ADDRESSES OF MEMBERS AND
                           PRINCIPAL OFFICE OF COMPANY

         The names and mailing addresses of the Members are as set forth on the
signature pages hereof. The location of the principal office of the Company
where the books and records of the Company shall be kept shall be at such place
as the Management Committee may from time to time determine. Notice of any
change in such office shall be given to each Member.


                                       7
<PAGE>   12


                                   ARTICLE V
                      REGISTERED AGENT; REGISTERED OFFICE;
                               ADDITIONAL OFFICES

         The name and address of the registered office of the Company in the
State of Delaware is c/o The Corporation Trust Company, Corporation Trust
Center, 1209 Orange Street, Wilmington, New Castle County, Delaware 19801. The
name and address of the registered agent for service of process on the Company
in the State of Delaware is The Corporation Trust Company, Corporation Trust
Center, 1209 Orange Street, Wilmington, New Castle County, Delaware 19801. The
Management Committee may change the registered agent or the registered office of
the Company and may establish such additional offices of the Company as the
Management Committee may, in its sole discretion, from time to time determine.

                                   ARTICLE VI
                                      TERM

         The term of the Company shall be from the date of filing of its
Certificate in the Office of the Secretary of State of the State of Delaware,
and shall be perpetual unless it is dissolved by an event described in Article
XVIII.

                                  ARTICLE VII
             CAPITAL CONTRIBUTIONS; SHARING RATIOS; CAPITAL ACCOUNTS

         SECTION 7.1 INITIAL CAPITAL CONTRIBUTIONS.

                  (a) Prior to the execution of this Agreement, the Members and
         certain of their Affiliates have contributed all of their respective
         rights and interest in the Contributed Entities to the Company, free
         and clear of all Encumbrances (the "Initial Capital Contributions").

                  (b) The Members shall agree, in good faith, on their initial
         balances in their GAAP Capital Accounts to be used for financial
         reporting purposes as discussed in Section 7.9 (each such amount being
         such Member's "Initial Balance") on or before November 30, 1999. The
         respective Sharing Ratios of the Members shall be as set forth in
         Exhibit A attached hereto and made a part hereof. Each Member shall
         execute an amendment to Exhibit A as soon as practicable following any
         change in Sharing Ratios pursuant to the provisions of this Agreement.

         SECTION 7.2 INCREMENTAL EXPANSION CAPITAL CONTRIBUTIONS. Upon written
request to the Company by any Subsidiary Management Committee, in accordance
with such Operating Subsidiary's limited liability company agreement, for a
capital contribution to fund an incremental expansion of such Operating
Subsidiary's Subsidiary System, each Member shall contribute cash in amounts
equal to its Sharing Ratio proportion of 100% of all amounts so requested (the
"Incremental Expansion Capital Contribution"). Such contributions shall be made
as necessary to allow the applicable Operating Subsidiary to pay timely such
obligations as they become due. The Management Committee shall send notice of
such required Capital Contribution to the Members in accordance with Section
7.4.


                                       8
<PAGE>   13


         SECTION 7.3 SUBSEQUENT CONTRIBUTIONS. Unless unanimously agreed to by
the Management Committee, no Member shall be required to make, or cause to be
made, any Capital Contributions other than the Initial Capital Contributions as
contemplated by Section 7.1 and the Incremental Expansion Capital Contributions
as contemplated by Section 7.2.

         SECTION 7.4 REQUESTS FOR CAPITAL CONTRIBUTIONS. The Management
Committee shall issue or cause to be issued a written request for payment of
each Capital Contribution to be made in accordance with Sections 7.1, 7.2 and
7.3, at such times as the Management Committee shall deem appropriate. Each
written request issued pursuant to this Section 7.4 shall contain the following
information:

                  (a) The amount of the Capital Contribution requested from each
         Member, such amount to be in accordance with the Member's Sharing
         Ratio;

                  (b) The purpose for which the Capital Contributions are to be
         applied in such reasonable detail as the Management Committee shall
         direct; and

                  (c) The date on which the Capital Contributions shall be made
         (which date shall not be less than 30 days following the date the
         request is given and shall reasonably approximate the date on which the
         Company expects to make the underlying payment) and the method of
         payment, such date and method to be the same for each of the Members.

         Each Member agrees to make payment of its respective Capital
         Contributions in accordance with the requests issued pursuant to this
         Section 7.4.

         SECTION 7.5 DELINQUENT MEMBER. If a Member does not contribute by the
time required all or any portion of a Capital Contribution that Member is
required to make as provided in this Agreement, the Company may exercise, on
notice to that Member (the "Delinquent Member"), one or more of the following
remedies:

                  (a) taking such action (including court proceedings) as the
         Management Committee may deem appropriate to obtain payment by the
         Delinquent Member of the portion of the Delinquent Member's Capital
         Contribution that is in default, together with interest on that amount
         at the Default Interest Rate from the date that the Capital
         Contribution was due until the date that it is made, all at the cost
         and expense of the Delinquent Member;

                  (b) notifying the other Members, any one or more of which (the
         "Lending Member(s)") may elect to advance the portion of the Delinquent
         Member's Capital Contribution that is in default, with the following
         results:

                           (i) The sum advanced shall constitute a loan from the
                  Lending Member(s) to the Delinquent Member and a Capital
                  Contribution of that sum to the Company by the Delinquent
                  Member under the applicable provisions of this Agreement;


                                       9
<PAGE>   14

                           (ii) the principal balance of the loan and all
                  accrued unpaid interest is due and payable on the tenth day
                  after written demand by the Lending Member(s) to the
                  Delinquent Member;

                           (iii) the amount loaned shall bear interest at the
                  Default Interest Rate from the date that the advance is deemed
                  made until the date that the loan, together with all interest
                  accrued on it, is repaid to the Lending Member(s);

                           (iv) all distributions from the Company that
                  otherwise would be made to the Delinquent Member (whether
                  before or after dissolution of the Company) instead shall be
                  paid to the Lending Member(s) until the loan and all interest
                  accrued on it have been paid in full to the Lending Member(s)
                  (with payments being applied first to accrued and unpaid
                  interest and then to principal), but all such payments to the
                  Lending Member(s) shall be treated for all purposes of this
                  Agreement as a distribution by the Company to the Delinquent
                  Member and a payment by the Delinquent Member to the Lending
                  Member(s); and

                           (v) the Lending Member(s) has the right, in addition
                  to the other rights and remedies granted to it under this
                  Agreement or at law or in equity, to take any action
                  (including court proceedings) that the Lending Member(s) may
                  deem appropriate to obtain payment by the Delinquent Member of
                  the loan and all accrued and unpaid interest on it, at the
                  cost and expense of the Delinquent Member;

                  (c) permitting one or more of the other Members (the
         "Contributing Member(s)") to make the Delinquent Member's Capital
         Contribution that is in default in proportions agreed to by those
         Contributing Members, with the following results:

                           (i) the sum advanced shall constitute a Capital
                  Contribution of the Contributing Member(s);

                           (ii) the Delinquent Member's Membership Interest and
                  Sharing Ratio shall be reduced by the number of percentage
                  points equal to the quotient (expressed as a percentage)
                  derived by dividing (A) the amount of the Delinquent Member's
                  Capital Contribution made by the Contributing Member(s) by (B)
                  the sum of the Sharing Capital Accounts of all the Members
                  (including the Capital Contribution being made by the
                  Contributing Member(s)); and

                           (iii) any reduction in the Delinquent Member's
                  Membership Interest and Sharing Ratio shall be reallocated to
                  the Contributing Member(s); or

                  (d) exercising any other rights and remedies available at law
         or in equity.

         SECTION 7.6 RETURN OF CAPITAL CONTRIBUTIONS. No Member shall be
entitled to the return of any part of its Capital Contribution or to be paid
interest in respect of either its Sharing Capital Account or any Capital
Contribution made by such Member. No unrepaid Capital Contribution shall be
deemed or considered to be a liability of the Company or any Member. No


                                       10
<PAGE>   15


Member shall be required to contribute or lend any cash or property to the
Company to enable the Company to return any Member's Capital Contributions to
the Member.

         SECTION 7.7 CAPITAL ACCOUNTS. All Capital Contributions shall be
credited to the contributing Member's Capital Accounts.

         SECTION 7.8 ADJUSTMENT OF 704(B) CAPITAL ACCOUNTS. If any additional
Membership Interests are to be issued in consideration for a contribution of
property or cash or if any Company property is to be distributed in liquidation
of the Company or a Membership Interest, the 704(b) Capital Accounts of the
Members (and the amounts at which all Company properties are carried on its
books and records) shall, immediately prior to such issuance or distribution, as
the case may be, be adjusted (consistent with the provisions of section 704(b)
of the Code and the Treasury Regulations promulgated thereunder) upward or
downward to reflect any Unrealized Gain or Unrealized Loss attributable to all
Company properties (as if such Unrealized Gain or Unrealized Loss had been
recognized upon actual sale of such properties upon a liquidation of the Company
immediately prior to such issuance). If the Agreed Value of any property of the
Company is properly reflected on the books of the Company at a value that
differs from the adjusted tax basis of such property, this Section 7.8 shall be
applied with reference to such value.

         SECTION 7.9 GAAP CAPITAL ACCOUNTS AND FINANCIAL REPORTING. For purposes
of establishing and maintaining the GAAP Capital Accounts and for financial
reporting purposes: (i) in connection with the capitalization of the Company,
the Company will report the value of the interests of the respective Members in
the Company based on the basis such Members had in their interests in Stingray,
UTOS, WCDC and Western Gulf they contributed to the Company as of the date of
contribution (for each Member, the "Contribution Basis"); (ii) such Contribution
Basis will be (a) used to capitalize the Company and (b) the excess of the
Contribution Basis over the underlying net book value of the fixed assets of
each of Stingray, UTOS, WCDC and Western Gulf immediately prior to such
contribution of such interest to the Company (the"Excess") will be depreciated
in accordance with GAAP as determined by the Members; (iii) the depreciation of
the Excess will be allocated pro rata to each Member based on such Member's
respective Contribution Basis; (iv) if a Member Disposes of its Membership
Interest, in whole or in part, the portion of such Member's Contribution Basis
and related undepreciated Excess of the Membership Interest being Disposed of,
will be allocated to the transferee for financial reporting purposes; and (v) if
any portion of the property underlying such contributed interests is Disposed of
by an Operating Subsidiary, the portion of the Members' Contribution Basis and
the related undepreciated Excess, related to the property being Disposed of,
will be used to allocate pro rata any accounting gain or loss to each Member.


                                  ARTICLE VIII
                                  DISTRIBUTIONS

         SECTION 8.1 DISTRIBUTIONS. Except as otherwise provided herein,
Distributable Cash shall be distributed in such amounts and at such times as
shall be determined by the Management Committee among all the Members
simultaneously pro rata in accordance with their respective Sharing Ratios.


                                       11
<PAGE>   16

                                   ARTICLE IX
                          ALLOCATIONS OF INCOME, GAIN,
                   LOSS, DEDUCTION AND CREDIT FOR TAX PURPOSES

         SECTION 9.1 GENERAL. Except as otherwise provided herein or unless
another allocation is required by Treasury Regulations issued under Section
704(b) of the Code (including, but not limited to, the qualified income offset
specified in Treasury Regulation Section 1.704-1(b)(2)(ii)(d)), for purposes of
maintaining the 704(b) Capital Accounts, all items of Company income, gain,
loss, deduction and credit shall be allocated among the Members pro rata in
accordance with their Sharing Ratios in effect for the period during which such
items accrue. For purposes of computing the amount of each item of income, gain,
deduction or loss, the determination, recognition and classification of such
item shall be the same as its determination, recognition and classification for
federal income tax purposes, provided that:

                  (a) Any deductions for depreciation, cost recovery or
         amortization attributable to any Company property shall be determined
         as if the adjusted basis of such property were equal to the Carrying
         Value of such property. Upon an adjustment to the Carrying Value of any
         Company property subject to depreciation, cost recovery or amortization
         pursuant to Section 7.8, any further deductions for such depreciation,
         cost recovery or amortization attributable to such property shall be
         determined as if the adjusted basis of such property were equal to the
         Carrying Value of such property immediately following such adjustment.

                  (b) Any income, gain or loss attributable to the taxable
         disposition of any Company property shall be determined by the Company
         as if the adjusted basis of such property as of such date of
         disposition were equal in amount to the Carrying Value of such property
         as of such date.

                  (c) Computation of all items of income, gain, loss and
         deduction shall be made without regard to any election under section
         754 of the Code that may be made by the Company and, as to those items
         described in the section 705(a)(1)(B) or section 705(a)(2)(B) of the
         Code, without regard to the fact that such items are not includable in
         gross income or are neither currently deductible nor capitalizable for
         federal income tax purposes.

         SECTION 9.2 [INTENTIONALLY OMITTED].

         SECTION 9.3 INCOME TAX ALLOCATIONS.

                  (a) The Company shall, except to the extent such item is
         subject to allocation pursuant to subsection (b) below, allocate each
         item of income, gain, loss, deduction and credit, as determined for
         federal and other income tax purposes, in the same manner as such item
         was allocated for purposes of maintaining the 704(b) Capital Accounts.

                  (b) The Company, for federal and other income tax purposes,
         shall, in the case of Contributed Properties, allocate items of income,
         gain, loss, depreciation and cost recovery deductions attributable to
         those properties with a Built-In Gain or Built-In Loss pursuant to
         section 704(c) of the Code under a method described in Treas. Reg.
         Section 1.704-3.


                                       12
<PAGE>   17

         Similar allocations shall be made in the event that the Carrying Value
         of Company properties subject to depreciation, cost recovery or
         amortization are adjusted pursuant to Section 7.8 upon the issuance of
         Membership Interests for cash. If an existing Member acquires
         additional Membership Interests, such allocations shall apply only to
         the extent of his or its additional Interests. No allocation under
         section 704(c) of the Code shall be charged or credited to a Member's
         Capital Accounts.

         SECTION 9.4 ALLOCATIONS ON TRANSFERS. Unless otherwise agreed in
writing by a transferor and transferee of a Membership Interest herein, income,
gain, loss, deduction or credit attributable to any Membership Interest that has
been transferred shall be allocated between the transferor and the transferee
using an acceptable method as provided under section 706 of the Code and related
Treasury Regulations.

         SECTION 9.5 RELIANCE ON ADVISORS. The Management Committee may rely
upon, and shall have no liability to the Members or the Company if they do rely
upon, the written opinion of tax counsel or accountants retained by the Company
from time to time with respect to all matters (including disputes with respect
thereto) relating to computations and determinations required to be made under
this Article IX or other provisions of this Agreement.

         SECTION 9.6 TAX MATTERS MEMBER.

                  (a) Leviathan Deepwater, as a Member Manager (as defined in
         Treasury Regulation Section 301.6231(a)(7)-1) is designated as the tax
         matters member ("TMM"), which shall have the same meaning as "tax
         matters partner" (as defined in section 6231(a)(7) of the Code). The
         TMM and the Members shall use their best efforts to comply with
         responsibilities outlined in this Section 9.6 and in sections 6222
         through 6232 of the Code (including any Treasury Regulations
         promulgated thereunder) and in doing so shall incur no liability to any
         other Member, except in the case of a failure by the TMM for any reason
         to make and include in the appropriate tax return a timely and
         effective election under Internal Revenue Code Section 754.

                  (b) The TMM shall not make any material federal income tax
         elections or material tax policy decisions affecting the Company,
         unless it has received the prior unanimous consent of the Management
         Committee.

                  (c) All tax returns and reports of the Company shall be
         prepared or caused to be prepared under the direction of the TMM. As
         early as reasonably possible prior to its filing of the Company's
         federal and state income tax returns, but in no event less than ten
         (10) business days prior to the filing, the TMM will provide the other
         Members with a pro forma copy of such returns and will provide the
         other Members with reasonable opportunity to consult with and/or advise
         the TMM with respect to all positions intended to be reflected. Such
         returns must be reviewed and approved unanimously by the Management
         Committee.

                  (d) If any Member intends to file a notice of inconsistent
         treatment under section 6222(b) of the Code, such Member shall, prior
         to the filing of such notice, notify the TMM of such intent and the
         manner in which the Member's intended treatment of a


                                       13
<PAGE>   18


         Company item is (or may be) inconsistent with the treatment of that
         item by the Company.

                  (e) No Member other than the TMM shall file a request pursuant
         to section 6227 of the Code for an administrative adjustment of Company
         items for any Company taxable year.

                  (f) No Member other than the TMM shall file a petition under
         Code sections 6226, 6228 or other Code sections with respect to any
         Company item or other tax matters involving the Company. In the case
         where the TMM files such petition, it shall determine the forum in
         which such petition will be filed.

                                   ARTICLE X
             BOOKS OF ACCOUNT, RECORDS, REPORTS AND TAX INFORMATION

         SECTION 10.1 BOOKS AND RECORDS. Proper and complete records and books
of account (including those required by the Act) shall be kept by the Company in
which shall be entered all transactions and other matters relative to the
Company's business as are usually entered into records and books of account
maintained by persons engaged in businesses of like character. The Company books
and records shall be maintained in accordance with generally accepted accounting
principles, and, to the extent applicable, the Uniform System of Accounts of the
FERC as from time to time applicable to a Class A "natural gas company" under
the Natural Gas Act, and shall be kept on the accrual basis. The Company books
and records shall be audited by the Certified Public Accountants at the end of
each fiscal year. The Company shall, and shall cause each of the Operating
Subsidiaries to, at all times make its books and records available at the
principal office of the Company or the Operating Subsidiary and shall be open to
the reasonable inspection and examination by the Members or their duly
authorized representatives during the business hours of the Company or the
Operating Subsidiary for any purpose reasonably related to the interest of such
Member as owner of the Company.

         SECTION 10.2 FINANCIAL INFORMATION.

                  (a) Annual Financial Statements. The Management Committee
         shall cause to be prepared and delivered to the Members:

                           (1) No later than ninety (90) days following the end
                  of each of the Company's fiscal years, a profit and loss
                  statement and a statement of cash flows for such fiscal year
                  and a balance sheet and a statement of the GAAP Capital
                  Accounts as of the end of such fiscal year, together with a
                  report thereon of the Certified Public Accountants;

                           (2) No later than ninety (90) days following the end
                  of each of the Company's fiscal years, such federal, state and
                  local income tax information and such other accounting and tax
                  information as shall be necessary for the preparation by the
                  Members of their respective income tax returns for such fiscal
                  year;


                                       14
<PAGE>   19

                           (3) When such returns become available, copies of all
                  federal, state and local income tax returns or information
                  returns, if any, which the Company is required to file; and

                           (4) As soon as practicable following receipt by the
                  Company thereof, financial statements or reports from an
                  Operating Subsidiary.

                  (b) Interim Financial Statements. No later than thirty (30)
         days after the end of each calendar month, the Management Committee
         shall cause to be prepared and delivered to the Members, together with
         an appropriate certificate of the person authorized to prepare the
         same:

                           (1) A profit and loss statement and statement of cash
                  flows for such month (including sufficient information to
                  permit each Member to calculate its tax accruals), for the
                  portion of the fiscal year then ended, and for the 12-month
                  period then ended;

                           (2) A balance sheet and a statement of the GAAP
                  Capital Accounts as of the end of such month; and

                           (3) A statement comparing the actual financial status
                  and results of the Company as of the end of or for such month
                  and the portion of the fiscal year then ended with the
                  budgeted or forecasted status and results as of the end of or
                  for such respective periods.

         SECTION 10.3 AUDITS. The Company shall have the Company's financial
statements and books of account audited at the end of each fiscal year by the
Certified Public Accountants.

         SECTION 10.4 INSPECTION OF FACILITIES AND RECORDS. Each Member shall
have the right at all reasonable times during usual business hours to inspect
the facilities of the Company and of the Operating Subsidiaries and to examine
and make copies of the books of account and other records of the Company and the
Operating Subsidiaries. Such right may be exercised through any agent or
employee of the Member designated in writing by it or by an independent public
accountant or attorney so designated. The Member making the request shall bear
all expenses incurred in any inspection or examination made at such Member's
behest.

         SECTION 10.5 BUDGETS. The Company shall cause to be prepared and
delivered to each Member such budgets, cash flow projections and other financial
reports and forecasts with respect to the Company and the Operating Subsidiaries
as from time to time may be reasonably requested by any Member.

                                   ARTICLE XI
                                   FISCAL YEAR

         The fiscal year of the Company shall end on the thirty-first (31st) day
of December in each year.


                                       15
<PAGE>   20


                                   ARTICLE XII
                                  COMPANY FUNDS

         The funds of the Company shall be deposited in such bank account or
accounts, or invested in such interest-bearing or non-interest-bearing accounts,
as shall be designated by the Management Committee. All withdrawals from any
such bank accounts shall be made by the Management Committee or the
Administrator or as otherwise duly authorized by the Management Committee.
Without the prior unanimous consent of the Management Committee, Company funds
shall not be commingled with those of any other Person.

                                  ARTICLE XIII
                                STATUS OF MEMBERS

         Except as provided in the Act or as expressly provided in a separate
written agreement signed by the relevant Member, the debts, obligations and
liabilities of the Company, whether arising in contract, tort or otherwise,
shall be solely the debts, obligations and liabilities of the Company, and no
Member shall be obligated personally for any such debt, obligation or liability
of the Company solely by reason of being a Member or acting as a member of the
Management Committee or as a member of the management committee of an Operating
Subsidiary.

                                  ARTICLE XIV
                      MANAGEMENT AND OPERATION OF BUSINESS

         SECTION 14.1 MEMBER MANAGEMENT. The management of the Company is fully
vested in the Members, acting exclusively in their membership capacities. To
facilitate the orderly and efficient management of the Company, the Members
shall act collectively as a "committee of the whole" (named the Management
Committee) pursuant to Section 14.2. The Company will not have "managers," as
that term is used in the Act, it being understood that the Representatives and
Alternate Representatives do not constitute "managers."

         SECTION 14.2 MANAGEMENT COMMITTEE. The Members shall act collectively
through meetings as a "committee of the whole," which is hereby named the
"Management Committee." Decisions or actions taken by the Management Committee
in accordance with the provisions of this Agreement shall constitute decisions
or actions by the Company and shall be binding on each Member of the Company.
The Management Committee shall conduct its affairs in accordance with the
following provisions and the other provisions of this Agreement:

                  (a) Organization of Management Committee:

                           (i) The Management Committee shall be composed of one
                  representative for each Member.

                           (ii) Each Member shall appoint one individual to
                  represent it on the Management Committee (individually, such
                  Member's "Representative" and collectively, such Members'
                  "Representatives"). Any individual may serve as the
                  Representative of more than one Member. Each Member shall also
                  appoint one


                                       16
<PAGE>   21


                  or more individuals ("Alternate Representatives") with the
                  power of substitution and authority to act in place of its
                  Representatives in case of the unavailability thereof. Each
                  Representative and Alternate Representative shall be an
                  officer or agent of the Member appointing him or her and shall
                  be duly authorized to act on behalf of and to bind the
                  appointing Member. Each Member reserves the right to remove
                  any one or more of its Representatives or Alternate
                  Representatives, as the case may be, and to appoint successors
                  and substitutes therefor, from time to time, and any such
                  change shall be effective upon such Member's delivering a
                  written notice of such change to the Company.

                           (iii) Notwithstanding the number of Representatives
                  and Alternate Representatives, each Member shall have the
                  right to vote its Sharing Ratio on all matters to be decided
                  by the Management Committee. If any Member becomes a
                  Delinquent Member and the Delinquent Member's delinquent
                  Capital Contribution has not otherwise been paid pursuant to
                  Section 7.5(c), then for voting purposes, unless and until the
                  Capital Contribution as to which the Delinquent Member is
                  delinquent is paid by such Member, (i) the Sharing Ratio of
                  such Member shall be deemed to be reduced in the same manner
                  as provided in Section 7.5(c)(iii) as if the other Members
                  shall have made the delinquent Capital Contribution of the
                  Delinquent Member and (ii) such reduction in the Sharing Ratio
                  of the Delinquent Member shall be apportioned among the other
                  Members in proportion to their respective Sharing Ratios.
                  Voting may occur by voice vote at a meeting of the Management
                  Committee or by written consent.

                           (iv) Unanimous approval, vote or consent of the
                  Management Committee shall mean the approval, vote or consent
                  of all of the Sharing Ratios.

                           (v) If any Member shall have breached or violated any
                  material covenant, condition, representation or warranty
                  contained in this Agreement, other than a breach or violation
                  to which the provisions of Section 7.5 apply, then the
                  Management Committee shall send, or cause to be sent, notice
                  to such Member describing the alleged breach or violation,
                  referring in such notice to the relevant Section of this
                  Agreement and stating the consequences of continued breach or
                  violation of such Section. If such Member does not remedy the
                  breach or violation within the earlier of (A) a reasonable
                  time or (B) 30 days of receipt of the Notice, the Majority in
                  Interest (based on Sharing Ratios) of the remaining Members
                  may vote (A) to exclude such breaching or violating Member and
                  its Representative and Alternate Representative(s) from
                  participation in the Management Committee and (B) to apportion
                  such breaching Member's Sharing Ratio for voting purposes to
                  the other Members; in the case of (A) and (B), only so long as
                  such breach or violation continues.

                  (b) Management Committee Consents: Except as otherwise
         expressly required in this Agreement, any action of the Management
         Committee shall require the affirmative vote of a Majority in Interest.
         Notwithstanding any other provision of this Agreement, the following
         actions require the unanimous consent, subject to the provisions of
         Section 14.2(a)(v), of the Management Committee:


                                       17
<PAGE>   22


                           (i) Adoption of any rules and procedures of the
                  Management Committee in addition to those set forth in this
                  Agreement and amendments or supplements thereto concerning the
                  conduct of the affairs of the Management Committee of the
                  Company;

                           (ii) The sale, transfer or other disposition of an
                  Operating Subsidiary or of all or substantially all of the
                  assets, whether in one transaction or a series of
                  transactions, of an Operating Subsidiary;

                           (iii) Engaging in any business other than the
                  ownership of the Operating Subsidiaries or authorizing an
                  Operating Subsidiary to engage in any business other than the
                  acquisition, construction, ownership, operation, repair,
                  maintenance, alteration and/or expansion of any Subsidiary
                  System;

                           (iv) The formation of any Operating Subsidiary other
                  than those Operating Subsidiaries formed on or prior to the
                  Formation Date, including, but not limited to, the terms and
                  provisions of the formation documents for such entity and any
                  amendments thereto;

                           (v) Any expansion or extension of any Subsidiary
                  System other than as permitted pursuant to Section 7.2;

                           (vi) Except for purposes of winding up the affairs of
                  the Company following a dissolution, the sale, lease,
                  mortgage, pledge or other transfer of all or substantially all
                  of the Company's assets;

                           (vii) Approval of the form and content of any
                  short-term or long-term financing commitment and any fee
                  arrangement related thereto;

                           (viii) Approval of all tax policy matters, tax
                  elections, and all federal and state income and franchise tax
                  returns of the Company; and

                           (ix) Any other act described in this Agreement or the
                  Act as requiring the unanimous consent of the Management
                  Committee or the Members, including, without limitation, those
                  acts set forth in Sections 7.3 and Articles XVIII and XXI.

                  (c) Meetings of the Management Committee:

                           (i) Regular meetings of the Management Committee
                  shall be held (at least every four months) on such dates, at
                  such times and at such locations as the members of such
                  committee shall from time to time determine, taking into
                  account the convenience of all parties. Notice of any special
                  meeting shall include a statement of the matters proposed to
                  be considered at such meeting and shall be given to all
                  participants by the Person calling the meeting, under normal
                  circumstances at least 10 Business Days prior to the meeting,
                  although shorter notice of a meeting (but not less than 24
                  hours) may be given if the circumstances


                                       18
<PAGE>   23


                  of urgency so require. All notices of Management Committee
                  meetings shall be given either in writing, or by telephone if
                  immediately followed by written confirmation. Each Member
                  agrees to use reasonable efforts to cause at least one of its
                  Representatives or an Alternate Representative to participate,
                  in the manner provided for herein, in all Management Committee
                  meetings. No Management Committee meeting shall be held unless
                  a Representative or Alternate Representative of each Member
                  participates in such meeting; provided, that if a duly
                  scheduled meeting is rescheduled due to the refusal or failure
                  of the Representative or any Alternate Representatives of one
                  or more Members to attend the meeting, then at the rescheduled
                  meeting, if there is a recurrence of the absence of the
                  Representative or any of the Alternate Representatives of any
                  such Member, the voting rights of such Member with respect to
                  matters addressed at such meeting(s) shall be apportioned
                  (based on Sharing Ratios) for voting purposes to, and all
                  decisions shall be made by, the Representatives or Alternate
                  Representatives of the other Members attending the meeting.

                           (ii) Representatives and Alternate Representatives
                  may participate in any Management Committee meeting by means
                  of telephone conference call or similar communications
                  equipment so long as all Persons participating in the meeting
                  can hear each other simultaneously. Except as otherwise
                  provided by applicable laws, any action required or permitted
                  to be taken at any meeting of the Management Committee may be
                  taken without a meeting, and without a vote, if a consent or
                  consents in writing, setting forth the action so taken, shall
                  be signed by the Representatives of not less than the minimum
                  of the Membership interests or Sharing Ratios that would be
                  necessary to take such action at a meeting at which the
                  Representatives of all the Members were present and voted.

                           (iii) The Management Committee shall appoint a
                  Chairman who shall preside at all Management Committee
                  meetings. The office of Chairman shall be alternated each
                  Calendar Year between (A) a Representative appointed by one of
                  the ANR Subs and (B) a Representative appointed by Leviathan
                  Deepwater, and vice versa.

                  (d) Sub-Committees:

                           (i) The Management Committee shall establish the
                  following Sub-Committees namely, the Finance Sub-Committee,
                  the Legal Sub-Committee and the Insurance Sub-Committee; and
                  each of such Sub-Committees shall continue until the
                  Management Committee unanimously approves the discontinuance
                  of such Sub-Committee. The Management Committee may also
                  establish such additional Sub-Committees from time to time as
                  it may determine, with such duties as the Management Committee
                  may prescribe.

                           (ii) Each Sub-Committee shall have one representative
                  representing each Member, provided that a representative on
                  the Sub-Committee may represent more than one Member. Each
                  representative so appointed shall serve


                                       19
<PAGE>   24


                  until his successor shall be duly appointed or until his
                  death, ineligibility to serve, resignation or removal by the
                  Member which appointed him.

                           (iii) The Finance Sub-Committee shall in addition to
                  any other duties designated by the Management Committee submit
                  to the Management Committee its recommendations as to (A) all
                  proposed Company financings, (B) the depositing and investment
                  of Company funds, (C) accounting, auditing, budgets, financial
                  forecasting and reporting and related matters and (D)
                  selection of the Certified Public Accountants.

                           (iv) The Legal Sub-Committee shall in addition to any
                  other duties designated by the Management Committee submit to
                  the Management Committee its recommendations as to (A) legal,
                  regulatory and related matters and (B) selection of outside
                  counsel.

                           (v) The Insurance Sub-Committee shall in addition to
                  any other duties designated by the Management Committee submit
                  to the Management Committee its recommendations as to
                  insurance and other risk management matters.

                           (vi) The recommendations of Sub-Committees shall not
                  be considered as an act or authorization of the Management
                  Committee or the Company and, unless expressly authorized by
                  the Management Committee, Sub-Committees shall only have the
                  authority to make recommendations to the Management Committee
                  for its consideration and shall have no authority to deal with
                  any Person other than the Company, the Members and the
                  Administrator. The failure on the part of any Sub-Committee to
                  make a recommendation with respect to any matters shall not
                  limit the power and authority of the Management Committee or
                  the officials of the Company (acting within the scope of their
                  authority) to take action with respect to such matters nor
                  shall any such failure limit the authority of the
                  Administrator to take action with respect to such matter in
                  the name and on behalf of the Company in accordance with the
                  service agreement between the Administrator and the Company
                  and any appropriate directions of the Management Committee.

                  (e) No Individual Actions: A Member may not bind the Company
         without the prior written authorization of the Management Committee.

                  (f) Business Development and Marketing. During the fourth
         calendar quarter of each calendar year, the Management Committee will
         develop and agree upon a marketing and business development plan for
         the Company and each of the Operating Subsidiaries for the upcoming
         calendar year.

         SECTION 14.3 EXCULPATION. NEITHER THE MANAGEMENT COMMITTEE, THE
MEMBERS, THEIR RESPECTIVE AFFILIATES, NOR ANY OWNER, OFFICER, DIRECTOR,
SHAREHOLDER, PARTNER, EMPLOYEE OR AGENT OR OTHER REPRESENTATIVE OF THE MEMBERS
OR THEIR RESPECTIVE AFFILIATES, SHALL BE LIABLE, RESPONSIBLE OR ACCOUNTABLE IN
DAMAGES OR OTHERWISE TO


                                       20
<PAGE>   25


THE COMPANY OR ANY MEMBER FOR ANY ACTION TAKEN OR FAILURE TO ACT (EVEN IF SUCH
ACTION OR FAILURE TO ACT CONSTITUTED THE NEGLIGENCE OF A PERSON) ON BEHALF OF
THE COMPANY WITHIN THE SCOPE OF THE AUTHORITY CONFERRED ON THE PERSON DESCRIBED
IN THIS AGREEMENT OR BY LAW UNLESS SUCH ACT OR OMISSION WAS PERFORMED OR OMITTED
FRAUDULENTLY OR CONSTITUTED GROSS NEGLIGENCE OR WILLFUL MISCONDUCT. TO THE
EXTENT THAT, AT LAW OR IN EQUITY, THE MANAGEMENT COMMITTEE, THE MEMBERS, THEIR
RESPECTIVE AFFILIATES, OR ANY OWNER, OFFICER, DIRECTOR, SHAREHOLDER, PARTNER,
EMPLOYEE OR AGENT OR OTHER REPRESENTATIVE THEREOF HAVE DUTIES (INCLUDING
FIDUCIARY DUTIES) AND LIABILTIES RELATING TO THE COMPANY OR TO ANOTHER MEMBER,
THE MANAGEMENT COMMITTEE, THE MEMBERS, THEIR RESPECTIVE AFFILIATES, OR ANY
OWNER, OFFICER, DIRECTOR, SHAREHOLDER, PARTNER, EMPLOYEE OR AGENT OR OTHER
REPRESENTATIVE THEREOF ACTING UNDER THIS AGREEMENT SHALL NOT BE LIABLE TO THE
COMPANY OR TO ANY OTHER MEMBER OR ITS AFFILIATES FOR THEIR RELIANCE ON THE
PROVISIONS OF THIS AGREEMENT. THE PROVISIONS OF THIS AGREEMENT, TO THE EXTENT
THAT THEY EXPAND OR RESTRICT THE DUTIES AND LIABILITIES OF THE MANAGEMENT
COMMITTEE, THE MEMBERS, THEIR RESPECTIVE AFFILIATES, OR ANY OWNER, OFFICER,
DIRECTOR, SHAREHOLDER, PARTNER, EMPLOYEE OR AGENT OR OTHER REPRESENTATIVE
THEREOF OTHERWISE EXISTING AT LAW OR IN EQUIT), ARE AGREED BY THE MEMBERS TO
REPLACE SUCH OTHER DUTIES AND LIABILITIES OF THE MANAGEMENT COMMITTEE, THE
MEMBERS, THEIR RESPECTIVE AFFILIATES, OR ANY OWNER, OFFICER, DIRECTOR,
SHAREHOLDER, PARTNER, EMPLOYEE OR AGENT OR OTHER REPRESENTATIVE THEREOF.

         SECTION 14.4 INDEMNIFICATION.

                  (a) TO THE FULLEST EXTENT PERMITTED BY LAW, THE MANAGEMENT
         COMMITTEE, THE MEMBERS, THEIR RESPECTIVE AFFILIATES AND THEIR
         RESPECTIVE OWNERS, OFFICERS, DIRECTORS, SHAREHOLDERS, PARTNERS,
         EMPLOYEES AND AGENTS OR ANY PERSON PERFORMING A SIMILAR FUNCTION
         (INDIVIDUALLY, AN "INDEMNITEE") SHALL BE RELEASED, INDEMNIFIED AND HELD
         HARMLESS BY THE COMPANY FROM AND AGAINST ANY AND ALL LOSSES, CLAIMS,
         DAMAGES, JUDGMENTS, LIABILITIES, OBLIGATION, PENALTIES, SETTLEMENTS AND
         REASONABLE EXPENSES (INCLUDING REASONABLE LEGAL FEES) ARISING FROM ANY
         AND ALL CLAIMS, DEMANDS, ACTIONS, SUITS OR PROCEEDINGS, CIVIL,
         CRIMINAL, ADMINISTRATIVE OR INVESTIGATIVE, IN WHICH THE INDEMNITEE MAY
         BE INVOLVED, OR THREATENED TO BE INVOLVED, AS A PARTY OR OTHERWISE, BY
         REASON OF ITS STATUS AS (X) A MEMBER OF THE MANAGEMENT COMMITTEE, A
         MEMBER OR AN AFFILIATE THEREOF, OR (Y) AN OWNER, OFFICER, DIRECTOR,
         SHAREHOLDER, PARTNER, EMPLOYEE OR AGENT OR OTHER REPRESENTATIVE OF A
         MEMBER OR AN AFFILIATE THEREOF, REGARDLESS OF WHETHER THE INDEMNITEE
         CONTINUES TO BE A MEMBER OF THE MANAGEMENT COMMITTEE, A MEMBER OR AN


                                       21
<PAGE>   26


         AFFILIATE THEREOF OR AN OWNER, OFFICER, DIRECTOR, SHAREHOLDER, PARTNER,
         EMPLOYEE OR AGENT OR OTHER REPRESENTATIVE OF A MEMBER OR AN AFFILIATE
         THEREOF AT THE TIME ANY SUCH LIABILITY OR EXPENSE IS PAID OR INCURRED,
         UNLESS THE ACT OR FAILURE TO ACT GIVING RISE TO INDEMNITY HEREUNDER WAS
         PERFORMED OR OMITTED FRAUDULENTLY OR CONSTITUTED GROSS NEGLIGENCE OR
         WILLFUL MISCONDUCT.

                  (b) The Company may purchase and maintain insurance on behalf
         of the Management Committee and such other Persons as the Management
         Committee shall determine against any liability that may be asserted
         against or expense that may be incurred by such Person in connection
         with the Company's activities, regardless of whether the Company would
         have the power to indemnify such Person against such liability under
         the provisions of this Agreement.

                  (c) Expenses incurred by any Indemnitee in defending any claim
         with respect to which such Indemnitee may be entitled to
         indemnification by the Company hereunder (including without limitation
         reasonable attorneys' fees and disbursements) shall, to the maximum
         extent permitted by law, be advanced by the Company prior to the final
         disposition of such claim, upon receipt of a written undertaking by or
         on behalf of such Indemnitee to repay the advanced amount of such
         expenses unless it is determined ultimately that the Indemnitee is
         entitled to indemnification by the Company under Section 14.4(a).

                  (d) The indemnification provided in this Section 14.4 is for
         the benefit of the Indemnitees and shall not be deemed to create any
         right to indemnification for any other Persons.

         SECTION 14.5 OFFICERS.

                  (a) Appointment and Tenure.

                           (i) The Management Committee may, from time to time,
                  designate officers of the Company to carry out the day-to-day
                  business of the Company.

                           (ii) The officers of the Company shall be comprised
                  of one or more individuals designated from time to time by the
                  Management Committee. No officer need be a resident of the
                  State of Delaware. Each officer shall hold his office(s) for
                  such terms and shall have such authority, exercise such powers
                  and perform such duties as shall be determined from time to
                  time by the Management Committee. Any number of offices may be
                  held by the same individual.

                           (iii) The officers of the Company may include a
                  chairman, vice chairman, a secretary, a treasurer and a
                  controller. The Management Committee may also designate one or
                  more assistant secretaries and assistant treasurers. The
                  Management Committee may designate such other officers and
                  assistant officers and agents as the Management Committee
                  shall deem necessary.


                                       22
<PAGE>   27


                  (b) REMOVAL. Any officer or agent may be removed as such at
         any time by the Management Committee, either with or without cause, in
         the discretion of the Management Committee.

                  (c) CHAIRMAN. The Chairman shall preside at all meetings of
         the Management Committee and shall have such power and authority as may
         be from time to time conferred upon him by the Management Committee. He
         may sign on behalf of the Company any contacts, agreements, bonds and
         mortgages and any applications or other documents to be filed with
         governmental authorities which the Management Committee has authorized
         to be signed on behalf of the Company and shall endeavor to see that
         all orders, directives and policies of the Management Committee are
         carried out.

                  (d) VICE CHAIRMAN. In the absence of the Chairman or in the
         event of his inability or refusal to act, the Vice Chairman shall
         perform the duties of the Chairman, and when so acting shall have the
         powers of and be subject to all restrictions imposed upon the Chairman.
         The Vice Chairman shall also perform such other duties as the
         Management Committee may from time to time prescribe. If the Chairman
         is a Representative of one of the ANR Subs, then the Vice Chairman
         shall be a representative of Leviathan Deepwater, and vice versa.

                  (e) SECRETARY. The Secretary shall attend all meetings of the
         Management Committee and record, or cause to be recorded, all
         proceedings of the meetings in a book to be kept for that purpose. If
         requested by a Representative, he shall give, or cause to be given,
         notice of all special meetings of the management Committee. The
         Secretary shall also perform such other duties as the Management
         Committee may from time to time prescribe.

                  (f) TREASURER. The Treasurer shall be responsible for advising
         the Management Committee concerning the custody and utilization of the
         Company's funds and securities and records with respect thereto. The
         Treasurer shall also perform such other duties as the Management
         Committee may from time to time prescribe.

                  (g) CONTROLLER. The Controller shall be responsible for
         advising the Management Committee concerning the maintenance of
         adequate accounting records and concerning internal auditing
         procedures. The Controller shall also perform such other duties as the
         Management Committee may from time to time prescribe.

         SECTION 14.6 MANAGEMENT COMMITTEE DEADLOCKS. If any matter or proposal
is brought before the Management Committee which is to be decided by a Majority
in Interest and a Majority in Interest does not vote for or against such matter
or proposal, any Member, by written notice to all the other Members given within
10 days after the initial vote on such matter or proposal, may call a meeting of
the Management Committee to reconsider such matter or proposal, such meeting to
be held when, where and as reasonably specified in said notice, but not less
than 15 days nor more than 25 days after the date of such Management Committee
vote. If such meeting is called and held as herein provided and a Majority in
Interest does not vote for or against such matter or proposal, then any Member
may within 10 days thereafter submit the matter to arbitration in accordance
with Sections 14.7 through 14.14. If no Member calls such a


                                       23
<PAGE>   28


meeting within the first 10 day period after the second meeting, no Member shall
thereafter have any right to request arbitration regarding such matter or
proposal.

         SECTION 14.7 INITIATION OF PROCEEDINGS. Any Member wishing to submit a
matter or proposal to arbitration as permitted by this Article XIV shall do so
by giving written notice of arbitration to the other Members and the Company.
The Member initiating arbitration shall also simultaneously file duplicate
copies of its notice of arbitration with any regional office of the AAA,
together with the appropriate fee as provided in the AAA's administrative fee
schedule. The initiating Member shall state in its notice of arbitration the
regional office of the AAA it has selected and thereafter all communications
with the AAA regarding the arbitration proceedings shall be directed to such
office unless the AAA directs otherwise. The notice of arbitration shall contain
a brief description of the nature of the dispute to be arbitrated and the remedy
or resolution sought by the Member initiating arbitration. Such notice may also
contain a request that the dispute be arbitrated by a panel of three
arbitrators. If no such request is contained in the notice, it shall be presumed
that the Member seeking arbitration desires the dispute to be determined by a
single arbitrator.

         SECTION 14.8 RESPONSES. Each of the other Members shall, within 20 days
from the date of mailing of the notice of arbitration, file with each of the
other Members, the Company and the AAA a response in which it states its view
regarding the dispute to be arbitrated and the remedy or resolution it desires.
Such response may also include a request that the dispute be determined by a
panel of three arbitrators. If any of the Members indicate their desire to have
the dispute determined by a panel of three arbitrators, it shall be so
determined. Otherwise, the dispute shall be determined by a single arbitrator.

         SECTION 14.9 SELECTION OF ARBITRATORS. As soon as practical after the
expiration of the 20 day period beginning upon the date of mailing of the
initiating Member's notice of arbitration, the AAA shall compile a list of
available arbitrators competent and qualified to determine the dispute as
described in the notice of arbitration and the responses thereto. If the Members
have elected, in accordance with Section 14.8, to have the dispute determined by
a panel of three arbitrators, the list shall be composed of seven (7) names and
if the Members have elected to have the dispute determined by a single
arbitrator, the list shall be composed of five (5) names. The AAA shall also, at
the same time, by lot, rank the Members in numerical order, and shall thereupon
forthwith transmit the list simultaneously to the Members and inform them of the
order in which it has ranked them. Unless all of the Members shall beforehand
agree to a different time or place, or both, they shall meet at the principal
office of the Company at 10:00 A.M. prevailing time on the seventh Business Day
after the date of mailing of the AAA's list of arbitrators and notice of
ranking. At such time, they shall each, one by one, in accordance with the
ranking determined by the AAA, strike a name from the list submitted by the AAA
until each Member has struck two (2) names. The three (3) or the one (1)
remaining, as the case may be, when such process of striking has been completed,
shall be the arbitrators or arbitrator to arbitrate and determine the dispute.
If any of the arbitrators so selected declines or for any reason fails to serve,
the AAA shall forthwith furnish the Members a second list of additional
available arbitrators competent and qualified to determine the dispute, such
list to contain five (5) names plus the names of as many individuals as there
are vacancies to fill because of the failure to serve of previously selected
arbitrators. The parties shall thereupon again, in accordance with the ranking
determined by the AAA, one by one, in turn, strike names from the


                                       24
<PAGE>   29


list. The individuals or individual whose names or name remain on the list upon
the completion of such striking shall, together with any arbitrators previously
chosen in the case of a dispute to be determined by a panel of three (3)
arbitrators, be the arbitrators to arbitrate and determine the dispute. This
procedure shall be repeated until one (1) or three (3) arbitrators, as the case
may be, who are willing and able to serve have been selected. If any of the
Members at any point fails to participate in the procedure hereinabove
established to select arbitrators, the AAA shall forthwith eliminate the
appropriate number of names from the list of arbitrators for each Member not so
participating.

         SECTION 14.10 LOCATION. Within 10 days of the mailing to the Members by
the AAA of notification that the one or all three of the arbitrators, as the
case may be, selected as above provided is or are willing and able to serve, the
Members may mutually agree upon the locale where the arbitration is to be held.
If the locale is not designated within such period, the AAA shall have the power
to determine the locale and its decision shall be final and binding; provided,
however, that if within the 10 days, one Member files a written request with the
AAA and each of the other Members that the hearing be held in a specific locale
and no other Member so files an alternate request, the arbitration proceedings
shall be conducted at the locale requested

         SECTION 14.11 RULES. Except as specifically herein provided for, all
arbitration proceedings under this Article XIV shall be conducted in accordance
with the Commercial Arbitration Rules of the AAA, as then amended and in effect;
and such rules shall be interpreted and applied and questions retarding the
arbitration process not resolved under such rules shall be determined in
accordance with the Uniform Arbitration Act, as enacted in the State of
Delaware.

         SECTION 14.12 LIMITATIONS ON ARBITRATION. Except with respect to the
matters specified in Section 14.6, no Member shall have the right to demand
arbitration with respect to any dispute, difference or question arising between
any of the Members themselves or any Member and the Company as to the meaning or
interpretation of any provision of this Agreement or as to the performance by
any Member or the Company of its obligation hereunder, whether before or after
the termination of this Agreement, or as to any matter whatsoever.

         SECTION 14.13 EFFECT OF AWARD. Upon any decision with respect to any
matter referred to arbitration pursuant to the provisions of this Article XIV,
each Member and the Company shall use its best efforts and take all such steps
as may be within its power to ensure that the matter determined by arbitration
is carried out as if it had received the appropriate approval of the Management
Committee. The Members agree that judgment on the arbitration award may be
entered by any court of competent jurisdiction.

         SECTION 14.14 COMPANY ADMINISTRATION. The Members select LOC as
Administrator of the Company. Contemporaneously with the execution of this
Agreement, the Company has executed and delivered an administrative service
agreement (the "Administrative Agreement") to LOC. The Administrator may not be
removed, and the Administrative Agreement may not be terminated or amended,
except pursuant to the terms of the Administrative Agreement. If the
Administrative Agreement is terminated or if LOC is removed as Administrator,
the Management Committee shall (i) select ANR as the new Administrator, subject
to ANR's written consent, and (ii) enter into a new Administrative Agreement
with ANR with terms and conditions agreeable to both ANR and the Management
Committee.


                                       25
<PAGE>   30

                                   ARTICLE XV
                      MANAGEMENT OF OPERATING SUBSIDIARIES

         SECTION 15.1 OPERATING SUBSIDIARY MANAGEMENT COMMITTEES. Each Operating
Subsidiary shall be managed, in accordance with the constitutive documents of
such Operating Subsidiary, by a management committee, each such management
committee to be composed of one (1) representative from each Member, which
representative shall have the right to vote such Member's Sharing Ratio on all
matters to be decided by such management committee. The same representative may
represent more than one Member.

                                  ARTICLE XVI
              DISPOSITIONS AND ENCUMBRANCES OF MEMBERSHIP INTERESTS

         SECTION 16.1 DISPOSITIONS AND ENCUMBRANCES OF MEMBERSHIP INTERESTS.

                  (a) A Disposition or Encumbrance of all or any portion of a
         Membership Interest may be effected only in strict accordance with the
         provisions of this Section 16.1. Any attempted Disposition or
         Encumbrance by a Member of a Membership Interest other than in strict
         accordance with this Section 16.1 is void, and the Company shall not
         recognize it. The Members agree that a breach of the provisions of this
         Section 16.1 may cause irreparable injury to the Company and to the
         other Members for which monetary damages (or other remedy at law) are
         inadequate in view of (i) the complexities and uncertainties in
         measuring the actual damages that would be sustained by reason of the
         failure of a Member to comply with such provision and (ii) the
         uniqueness of the Company business and the relationship among the
         Members. Accordingly, the Members agree that the provisions of this
         Section 16.1 may be enforced by specific performance.

                  (b) Except as permitted by Section 16.2, a Member may Dispose
         of its Membership Interest only if:

                           (i) the Disposition would not allow any creditor of
                  the Company or an operating Subsidiary to call, accelerate or
                  otherwise alter the terms or conditions of any indebtedness of
                  the Company or an Operating Subsidiary;

                           (ii) the Disposing Member's assignee enters into an
                  amendment to this Agreement or other Document acceptable in
                  form and substance to the Management Committee whereby the
                  assignee agrees to be bound by the terms of this Agreement;

                           (iii) the Disposition is pursuant to an applicable
                  exemption from registration under the Securities Act of 1933,
                  as amended, and other applicable securities laws;

                           (iv) unless unanimously consented to by the
                  Management Committee, such disposition does not result in a
                  termination of the Company for federal income tax purposes
                  under section 708(b)(1)(B) of the Code, or cause the Company
                  to be treated as a corporation under the Code; and


                                       26
<PAGE>   31


                           (v) the Disposition consists of equal percentages of
                  the Disposing Member's Capital Accounts and Sharing Ratio.

                  (c) If a filing under the Hart-Scott-Rodino Antitrust
         Improvements Act of 1976, as amended, is required in connection with
         the Disposition by a Member of any of its Membership Interest, which
         filing would not be required if the transfer of such Membership
         Interest were instead accomplished by a change in control of the
         Disposing Member, then the Disposing Member may not effect such
         Disposition of its Membership Interest except with the unanimous
         consent of the Management Committee.

                  (d) Notwithstanding any contrary provision contained in this
         Agreement, no Member shall dispose of such Member's rights or
         obligations arising from or related to this Agreement, the Company or
         any interest therein if such disposition would result in the violation
         of the Act or any other laws. Any such attempted Dispositions are void
         ab initio.

         SECTION 16.2 PERMITTED DISPOSITIONS AND ENCUMBRANCES. Nothing contained
in this Agreement other than Section 16.1 (b)(iv) shall prevent:

                  (a) The Disposition by any Member of any of its right, title
         and interest in the Company (including indebtedness thereof) if such
         right, title and interest is transferred to another Person which is an
         Affiliate of the transferor pursuant to (a) a statutory merger or
         consolidation or (b) a sale of all or substantially all of the assets
         of the transferor provided that such Affiliate assumes by operation of
         law or express agreement with the Company (in form and substance
         satisfactory to the Management Committee) all of the obligations of the
         transferor under this Agreement and that no such transfer (other than
         pursuant to a statutory merger or consolidation wherein all obligations
         and liabilities of the Member are assumed by the successor Person by
         operation of law) shall relieve the transferor of its obligations under
         this Agreement without the unanimous approval of the Management
         Committee. Upon such transfer such Affiliate shall be admitted as a
         Member in substitution of the Member which was the transferor.

                  (b) An Encumbrance (and any transfer made in foreclosure or
         other enforcement of such Encumbrance) in all or any portion of a
         Member's right, title or interest in the profits and surplus of the
         Company or in any indebtedness of the Company or an Operating
         Subsidiary under any Encumbrance executed by or binding upon such
         Member, provided that such assignee, pledgee, trustee or other
         transferee shall not have any voice in the management of the Company as
         a result of any such transfer.

                                  ARTICLE XVII
                          RESIGNATION, BANKRUPTCY, ETC.

         SECTION 17.1 COVENANT NOT TO WITHDRAW. No Member has the right to, and
each Member agrees that it will not, resign, retire or withdraw from the Company
as a Member without the prior unanimous consent of the Management Committee.


                                       27
<PAGE>   32


         SECTION 17.2 AFFECTED MEMBER.

                  (a) If any Member ceases to be a Member other than in
         connection with the transfer of all that Member's Membership Interest
         and the admission of the transferee as a Member as permitted by Article
         XVI, or remains a Member after becoming a Bankrupt Member (the
         "Affected Member"), the Company shall have the option, exercisable by
         notice from the other Members who are not Affiliates of the Affected
         Member (the "Other Members") to the Affected Member at any time prior
         to the 90th day after receipt of notice of the occurrence of the event
         causing it to become an Affected Member, to buy (or to designate
         another Person to buy), and on the exercise of this option the Affected
         Member shall sell, its interests in the Company (the "Interest").

                  (b) The purchase price shall be an amount equal to the fair
         market value of the Interest determined by agreement by the Affected
         Member and the Other Members, taking into account any sums owed to the
         Affected Member by the Company or by the Affected Member to the
         Company; however, if those persons do not agree on the fair market
         value on or before the 30th day following the exercise of the option,
         then the Other Members shall, by notice to the Affected Member on or
         before the fifth day after the expiration of such 30-day period,
         initiate the determination of fair market value by an independent
         appraiser. Such notice shall designate five appraisal firms recognized
         in the United States. The Affected Member shall select one of such
         appraisal firms within 20 days after receipt of such notice. Each of
         the Affected Member and the Other Members shall submit a proposed fair
         market value to the appraisal firm, together with any supporting
         documentation it deems appropriate, within 30 days after selection of
         the appraisal firm. The appraisal firm shall determine the fair market
         value by selection of one of the proposed fair market values submitted
         (and shall have no authority beyond selection of one of such proposals)
         as promptly as possible (and in any event on or before the 30th day
         after submittal of the competing proposals). The Affected Member and
         the Company each shall pay one-half of the costs of the appraisal. The
         closing of the acquisition of the Interest contemplated hereunder shall
         be consummated at a closing held at the principal offices of the
         Company on or before the 60th day after the determination of the fair
         market value of the Interest but effective at the end of the calendar
         month occurring on or immediately prior to such closing. The purchaser
         shall pay the fair market value as so determined in cash at the
         closing. At the closing, the Affected Member shall deliver to the
         Company or its designee such transfer documentation reasonably
         acceptable to the Company or such designee as shall be required to
         evidence the transfer of such Interest, free and clear of all liens and
         encumbrances, except those created under this Agreement.

                  (c) The payment to be made to the Affected Member under this
         Section 17.2 is in complete liquidation and satisfaction of all
         the rights and interest of the Affected Member (and of all persons
         claiming by, through, or under the Affected Member) in and in respect
         of the Company and any rights against the Company and (insofar as the
         affairs of the Company are concerned) against the Members, and
         constitutes a compromise to which all Members have agreed pursuant to
         Section 18-502(b) of the Act.

                  (d) If an event requiring a winding up of the Company occurs
         before the purchase price for the Interest is determined under Section
         17.2(b), then the purchase and sale shall not occur. Instead, the
         Affected Member or its successors shall be entitled to


                                       28
<PAGE>   33


         receive in the liquidation of the Company the same amount that person
         would have received had the Affected Member continued to be a Member or
         not become a Bankrupt Member.

                                 ARTICLE XVIII
                           DISSOLUTION OF THE COMPANY

         The happening of any one of the following events shall work an
immediate dissolution of the Company:

                  (a) the unanimous written consent of the Members; or

                  (b) any other event causing dissolution as described in
         section 18-801 (a)(4) or (5) of the Act.

                                  ARTICLE XIX
                    WINDING UP AND TERMINATION OF THE COMPANY

         SECTION 19.1 LIQUIDATOR. If the Company is dissolved and wound up for
any reason, a liquidator (the "Liquidator") shall commence to wind up the
affairs of the Company and to liquidate and sell its assets. The Management
Committee shall serve as the Liquidator. The Liquidator shall have full right
and discretion to determine the time, manner and terms of sale or sales of
Company property pursuant to such liquidation having due regard to the activity
and condition of the relevant market and general financial and economic
conditions. The Liquidator appointed in the manner provided herein shall have
and may exercise, without further authorization or consent of any of the parties
hereto or their legal representatives or successors in interest, all of the
powers conferred upon the Management Committee under the terms of this Agreement
(but subject to all of the applicable limitations, contractual and otherwise,
upon the exercise of such powers) to the extent necessary or desirable in the
good faith judgment of the Liquidator to carry out the duties and functions of
the Liquidator hereunder, for and during such period of time, not to exceed two
years after the date of dissolution of the Company, as shall be reasonably
required in the good faith judgment of the Liquidator to complete the
liquidation and dissolution of the Company as provided for herein, including,
without limitation, the following specific powers:

                  (a) The power to continue to manage and operate any business
         of the Company during the period of such liquidation or dissolution
         proceedings, excluding, however, the power to make and enter into
         contracts that may extend beyond the period of liquidation.

                  (b) The power to make sales and incident thereto to make
         deeds, bills of sale, assignments and transfers of assets and
         properties of the Company; provided, that the Liquidator may not impose
         personal liability upon any of the Members under any such instrument.

                  (c) The power to borrow funds as may, in the good faith
         judgment of the Liquidator, be reasonably required to pay debts and
         obligations of the Company or operating expenses, and to execute and/or
         grant deeds of trust, mortgages, security



                                       29
<PAGE>   34

         agreements, pledges and collateral assignments upon and encumbering any
         of the Company properties as security for repayment of such loans or as
         security for payment of any other indebtedness, of the Company;
         provided, that the Liquidator shall not have the power to create any
         personal obligation on any of the Members to repay such loans or
         indebtedness other than out of available proceeds of foreclosure or
         sale of the properties or assets as to which a lien or liens are
         granted as security for payment thereof.

                  (d) The power to settle, release, compromise or adjust any
         claims asserted to be owing by or to the Company, and the right to
         file, prosecute or defend lawsuits and legal proceedings in connection
         with any such matters.

         SECTION 19.2 RESERVES. After making payment or provision for payment of
all debts and liabilities of the Company and all expenses of liquidation, the
Liquidator may set up, for a period not to exceed the two (2) year period set
forth in Section 19.1, such cash reserves as the Liquidator may deem reasonably
necessary for any contingent liabilities or obligations of the Company. Upon the
satisfaction or other discharge of such contingency, the amount of the reserves
not retired, if any, will be distributed in accordance with this Article.

         SECTION 19.3 LIQUIDATION DISTRIBUTIONS. Upon the winding up and
termination of the business and affairs of the Company, its assets (other than
cash) shall be sold and its liabilities and obligations to creditors and all
expenses incurred in its liquidation shall be paid (either by payment or the
making of reasonable provision for payment). Thereafter, the net proceeds from
such sales (after deducting all selling costs and expenses in connection
therewith), together with (at the expiration of the two-year period set forth in
Section 19.1) the balance and reserve account referred to in Section 19.2 above,
shall be distributed among the Members in accordance with their respective
positive balances in their 704(b) Capital Accounts.

         SECTION 19.4 ACCOUNTING. Within a reasonable time following the
completion of the liquidation of the Company's properties, the Liquidator shall
supply to each of the Members a statement prepared by the Certified Public
Accountants that shall set forth the assets and the liabilities of the Company
as of the date of complete liquidation, each Member's pro rata portion of
distributions pursuant to Section 19.3 and the amount retained as reserves by
the Liquidator pursuant to Section 19.2.

         SECTION 19.5 ONLY RECOURSE TO COMPANY ASSETS. Each holder of an
interest in the Company shall look solely to the assets of the Company for all
distributions with respect to the Company and its Capital Contribution thereto
(including the return thereof) and share of profits or losses thereof, and shall
have no other recourse therefor (upon dissolution or otherwise) against the
Company, the Management Committee or the Liquidator. No holder of an interest in
the Company shall have any right to demand or receive property other than cash
upon dissolution and termination of the Company.

         SECTION 19.6 TERMINATION. Upon the completion of the liquidation of the
Company and the distribution of all Company funds, the Company shall terminate
and the Liquidator shall (and is hereby given the power and authority to)
execute, acknowledge, swear to and record all documents required to effectuate
the dissolution and termination of the Company. No Member shall be required to
restore any deficit balance existing in any of its Capital Accounts upon the


                                       30
<PAGE>   35


liquidation and termination of the Company provided that such Member has made
all Capital Contributions that it has agreed to make as contemplated by this
Agreement.

                                   ARTICLE XX
                                     NOTICES

         To be effective, all notices and demands under this Agreement must be
in writing (including telex, facsimile, telecopier or similar writing) and sent
to the addresses of the Members or their respective assigns set forth on the
signature pages hereof. Notices delivered in accordance with the foregoing shall
be deemed to have been given made and effective upon receipt. Any Member or his
assignee may designate a different address to which notices or demands shall
thereafter be directed by written notice given in the manner hereinabove
required and delivered to the Company at its principal office as hereinabove,
set forth. Notice to all the Members shall be deemed to be notice to the
Company.

                                  ARTICLE XXI
                             AMENDMENT OF AGREEMENT

         This Agreement may be modified or amended from time to time solely by
the written agreement of the Members holding Membership Interests representing
100% of the Sharing Ratios.

                                  ARTICLE XXII
                    REPRESENTATIONS, WARRANTIES AND COVENANTS

         Each Member hereby represents and warrants to the other Members that
(i) it is duly organized and validly existing in the jurisdiction of its
organization, with full power and authority to enter into and perform its
obligations under this Agreement; (ii) it has validly executed this Agreement,
and upon delivery this Agreement shall be a binding obligation of such party,
enforceable against such party in accordance with its terms; and (iii) its entry
into this Agreement and the performance of its obligations hereunder will not
require the approval of any governmental body or regulatory authority and will
not violate, conflict with or cause a default under any of its organizational
documents, any contractual covenant or restriction by which such party is bound,
or any applicable law, regulation, rule, ordinance, order, judgment or decree.

                                 ARTICLE XXIII
                                  MISCELLANEOUS

         SECTION 23.1 NO PARTITION. The Members agree that the Company
properties are not and will not be subject to or otherwise suitable for
partition. Accordingly, each Member hereby irrevocably waives any and all rights
that it may have to maintain any action for partition of any Company property.

         SECTION 23.2 ENTIRE AGREEMENT. This Agreement, and the additional
documents and agreements executed in connection herewith or referred to herein
and therein, constitute the entire agreement among the parties hereto with
respect to the subject matter hereof. They supersede any prior agreement or
understandings among them, and this Agreement may not be modified or amended in
any manner other than as set forth herein.


                                       31
<PAGE>   36


         SECTION 23.3 GOVERNING LAW. THIS AGREEMENT AND THE RIGHTS OF THE
PARTIES HEREUNDER SHALL BE GOVERNED BY AND INTERPRETED IN ACCORDANCE WITH THE
LAWS OF THE STATE OF DELAWARE.

         SECTION 23.4 BINDING EFFECT. Except as herein otherwise specifically
provided, this Agreement shall be binding upon and inure to the benefit of the
parties and their legal representatives, heirs, administrators, executors,
successors and assigns.

         SECTION 23.5 CONTEXT. Wherever from the context it appears appropriate,
each term stated in either the singular or the plural shall include the singular
and the plural, and pronouns stated in the masculine, the feminine or the neuter
gender shall include the masculine, feminine and neuter.

         SECTION 23.6 CAPTIONS. Captions contained in this Agreement are
inserted only as a matter of convenience and in no way define, limit or extend
the scope or intent of this Agreement or any provision hereof.

         SECTION 23.7 EFFECT OF INVALID PROVISION. If any provision of this
Agreement, or the application of such provision to any person or circumstance,
shall be held invalid, the remainder of this Agreement, or the application of
such provision to persons or circumstances other than those to which it is held
invalid, shall not be affected thereby.

         SECTION 23.8 COUNTERPART EXECUTION. This Agreement may be executed in
several counterparts, each of which shall be deemed an original but all of which
shall constitute one and the same instrument. It shall not be necessary for all
Members to execute the same counterpart hereof.

         SECTION 23.9 LAWS AND REGULATORY BODIES. This Agreement and the
obligations of the Partners hereunder are subject to all applicable laws, rules,
orders and regulations of governmental authorities having jurisdiction and in
the event of conflict, said laws, rules, orders and regulations of governmental
authorities having jurisdiction shall control. If, as a result of any
transaction (including but not limited to any acquisition) entered into in
connection with the formation of the Company, any regulatory agency (including
but not limited to FERC or FTC) or court of competent jurisdiction seeks or
orders divestiture or sale of any pipeline assets or interests, the Members
agree that any such divestiture or sale will be satisfied solely through (i)
divestiture or sale of the pipeline assets held at such time by one or more
Operating Subsidiaries or (ii) divestiture or sale of a portion of the
Membership Interest held by the Members; provided, that in the case of (ii)
above, the portion of Membership Interest sold or divested by Leviathan
Deepwater will equal the total amount of Membership Interests sold or divested
by the ANR Subs in the aggregate, and vice versa. In no event shall the Company,
any Member or any Affiliate of any Member be required to litigate with any
regulatory agency to oppose such divestiture or sale. In no event shall any
Member or any Affiliate of any Member be required by any other Member to divest
or sell any ownership interest in any pipeline other than those owned by the
Operating Subsidiaries to resolve any investigation, litigation or regulatory
proceeding arising out of the formation of the Company. The Members agree to
work cooperatively to resolve any agency investigation or other regulatory
proceeding and agree to share the reasonable costs of any third party experts or
consultants retained to assist in resolving


                                       32
<PAGE>   37


such investigation or proceeding. The Members will equally share any gain or
loss arising from any divestiture or sale of assets of the Company or the
Operating Subsidiaries undertaken to resolve or prevent any agency
investigation, litigation or regulatory proceeding.

         SECTION 23.10 BUSINESS OPPORTUNITY. Participation in the Company shall
not in any way restrain any Member or its Affiliates or any officers, directors,
shareholders, members, employees, agents or other representatives of any of them
in other present or future business activities, opportunities, transactions,
Ventures or other arrangements of any nature or description, whether or not any
such activity is competitive with the business of the Company or any of the
Company's Affiliates, or in any way preclude or restrict any of them from
entering into a joint venture, partnership or other business arrangement with
the Company. None of any Member or any Member's Affiliates or any officers,
directors, shareholders, members, employees, agents or other representatives of
any of them shall under any circumstances be obligated or bound to offer or
present to the Company any business opportunity offered to such Person as a
prerequisite to the acquisition of or investment in such business opportunity by
any of them. Other than for tax purposes, nothing herein is intended to create a
partnership, joint venture, agency or other relationship creating fiduciary or
quasi-fiduciary duties or similar duties and obligations or subject the Members
to joint and several or vicarious liability or to impose any duty, obligation or
liability that would arise therefrom with respect to any or all of the Members.

         SECTION 23.11 ENTITLEMENT TO CERTIFICATES. Every owner of a Membership
Interest in the Company, unless and to the extent the Company elects otherwise,
shall be entitled to have a certificate, in such form as is approved by the
Company and conforms with applicable law, certifying the Membership Interest
owned by it. Further, subject to the other provisions of this Agreement, for
purposes of providing for transfer of, perfecting a security interest in, and
other relevant matters related to, a Membership Interest, the Membership
Interest shall be deemed to be a "security" subject to the rules set forth in
Chapters 8 and 9 of the Texas Uniform Commercial Code and any similar Uniform
Commercial Code provision adopted by the States of New York or Delaware or any
other relevant jurisdiction.

            [The remainder of this page is intentionally left blank.]



                                       33
<PAGE>   38


         IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the day and in the year first above written.

Address:                                  American Natural Offshore Company
500 Renaissance Center                    By: /s/ WILLIAM L. JOHNSON
Detroit, Michigan 48243                      ----------------------------------
Telephone: (313) 496-2194                 Name:   William L. Johnson
FAX: (313) 496-3299                       Title:  Senior Vice President

Address:                                  Texas Offshore Pipeline System, Inc.
500 Renaissance Center                    By: /s/ WILLIAM L. JOHNSON
Detroit, Michigan 48243                      ----------------------------------
Telephone: (313) 496-2194                 Name:   William L. Johnson
FAX: (313) 496-3299                       Title:  Senior Vice President

Address:                                  Unitex Offshore Transmission Company
500 Renaissance Center                    By: /s/ WILLIAM L. JOHNSON
Detroit, Michigan 48243                      ----------------------------------
Telephone: (313) 496-2194                 Name:   William L. Johnson
FAX: (313) 496-3299                       Title:  Senior Vice President

Address:                                  ANR Western Gulf Holdings, L.L.C.
500 Renaissance Center                    By: /s/ WILLIAM L. JOHNSON
Detroit, Michigan 48243                      ----------------------------------
Telephone: (313) 496-2194                 Name:   William L. Johnson
FAX: (313) 496-3299                       Title:  Senior Vice President


Address:                                  Leviathan Deepwater, L.L.C.
1001 Louisiana-Suite 2600                 By: /s/ T. DARTY SMITH
Houston, Texas 77002                         ----------------------------------
Telephone: (713) 420-2131                 Name:   T. Darty Smith
FAX: (713) 420-5472                       Title:  Vice President



<PAGE>   39


                                    Exhibit A
                                       To
                       Limited Liability Company Agreement
                                       Of
                           Deepwater Holdings, L.L.C.

         The Sharing Ratios of the Members of Deepwater Holdings, L.L.C. are as
follows:

<TABLE>
<CAPTION>
         Member                                                 Sharing Ratio
         ------                                                 -------------
<S>                                                             <C>
         Leviathan Deepwater, L.L.C................................50.000%
         American Natural Offshore Company.........................14.819%
         Texas Offshore Pipeline System, Inc.......................14.819%
         Unitex Offshore Transmission Company.......................2.717%
         ANR Western Gulf Holdings, L.L.C..........................17.645%

         Total....................................................100.000%
</TABLE>

<PAGE>   1

                                                                   EXHIBIT 10.19


===============================================================================


                          PURCHASE AND SALE AGREEMENT


                                    BETWEEN

                          LEVIATHAN DEEPWATER, L.L.C.

                                   AS SELLER


                                      AND


                       ANR WESTERN GULF HOLDINGS, L.L.C.

                                    AS BUYER






                         DATED AS OF SEPTEMBER 30, 1999


===============================================================================





<PAGE>   2

                          PURCHASE AND SALE AGREEMENT

                               TABLE OF CONTENTS
<TABLE>


<S>                                                                                                              <C>
ARTICLE I  DEFINITIONS............................................................................................1
   1.1   Definitions..............................................................................................1
   1.2   Terminology..............................................................................................3

ARTICLE II PURCHASE AND SALE......................................................................................4
   2.1   The Transactions.........................................................................................4
   2.2   Closing..................................................................................................4
   2.3   Actions at Closing.......................................................................................4

ARTICLE III   REPRESENTATIONS AND WARRANTIES OF SELLER............................................................4
   3.1   Organization and Good Standing...........................................................................4
   3.2   Authority of Seller......................................................................................4
   3.3   No Violations............................................................................................5
   3.4   Title to Purchased Interest..............................................................................5
   3.5   Governmental and Third Party Approvals...................................................................5

ARTICLE IV REPRESENTATIONS AND WARRANTIES OF BUYER................................................................6
   4.1   Organization and Good Standing...........................................................................6
   4.2   Authority of Buyer.......................................................................................6
   4.3   No Violations............................................................................................6
   4.4   Acquisition as Investment................................................................................6
   4.5   Brokerage or Finders Fees................................................................................7

ARTICLE V  ADDITIONAL AGREEMENTS AND COVENANTS....................................................................7
   5.1   Covenants of Seller......................................................................................7
   5.2   Covenants of Buyer.......................................................................................7
   5.3   Mutual Covenants.........................................................................................7

ARTICLE VI CONDITIONS TO CLOSING..................................................................................8
   6.1   Buyer's Obligation to Close..............................................................................8
   6.2   Seller's Obligation to Close.............................................................................9

ARTICLE VII  INDEMNIFICATION.....................................................................................10
   7.1   Indemnification of Buyer................................................................................10
   7.2   Indemnification of Seller...............................................................................11
   7.3   Indemnification Procedures..............................................................................11
   7.4   Negligence..............................................................................................13
   7.5   Limitation on Liabilities...............................................................................13
   7.6   Survival................................................................................................13

ARTICLE VIII  TERMINATION RIGHTS.................................................................................14
   8.1   Termination.............................................................................................14
   8.2   Effect of Termination...................................................................................14

ARTICLE IX ARBITRATION...........................................................................................14
   9.1   Arbitration.............................................................................................14
</TABLE>

                                       i

<PAGE>   3
<TABLE>

<S>                                                                                                             <C>
ARTICLE X  GENERAL...............................................................................................16
   10.1  Exclusive Agreement.....................................................................................16
   10.2  Successors and Assigns..................................................................................16
   10.3  Amendments..............................................................................................16
   10.4  Further Assurances......................................................................................16
   10.5  Notices.................................................................................................17
   10.6  Governing Law...........................................................................................17
   10.7  Severability............................................................................................17
   10.8  Counterparts............................................................................................17
   10.9  Expenses................................................................................................17
</TABLE>

Exhibits to Purchase and Sale Agreement:

         Exhibit A         Form of Assignment


                                       ii

<PAGE>   4


                          PURCHASE AND SALE AGREEMENT


         THIS PURCHASE AND SALE AGREEMENT is made and entered into as of the
30th day of September, 1999 between Leviathan Deepwater, L.L.C., a Delaware
limited liability company ("Seller") and ANR Western Gulf Holdings, L.L.C., a
Delaware limited liability company ("Buyer").

         WHEREAS, Seller owns a 59.66% membership interest in Deepwater
Holdings, L.L.C., a Delaware limited liability company ("Holdings"), and Buyer
(together with its affiliates) owns a 40.34% membership interest in Holdings;

         WHEREAS, Seller desires to sell to Buyer and Buyer desires to purchase
from Seller a 9.66% membership interest in Holdings (the "Purchased Interest"),
subject to and in accordance with the terms of this Agreement;

         NOW, THEREFORE, in consideration of the mutual promises made herein
and other good and valuable consideration, the receipt and sufficiency of which
are hereby acknowledged, and subject to the conditions hereinafter set forth,
the Parties hereto agree as follows:


                                   ARTICLE I
                                  DEFINITIONS

         1.1 Definitions. The terms set forth below shall have the meanings
ascribed to them in this Article I or in the part of this Agreement referred to
below:

         Affiliate: with respect to an entity, any other entity controlling,
controlled by or under common control with such entity. As used in this
definition, the term "control," including the correlative terms "controlling,"
"controlled by" and "under common control with" shall mean the possession,
direct or indirect, of the power to direct or cause the direction of the
management or policies of an entity, whether through ownership of voting
securities, by contract or otherwise.

         Agreement: this Purchase and Sale Agreement, as amended, restated,
supplemented, or otherwise modified from time to time.

         Business Day: any day other than a Saturday, a Sunday or a day on
which banks in Houston, Texas are authorized or required by law to be closed.

         Buyer: as defined in the preamble.

         Buyer Indemnified Party: as defined in Section 7.1.

         Claim: any demand, claim, action, investigation, cause of action,
legal proceeding or arbitration, whether or not ultimately determined to be
valid.


                                       1

<PAGE>   5


         Claim Notice: as defined in Section 7.3.1.

         Closing: as defined in Section 2.2.

         Closing Date: as defined in Section 2.2.

         Code: the Internal Revenue Code of 1986, as amended.

         Election Period: as defined in Section 7.3.1.

         Encumbrance: any lien, pledge, condemnation proceeding, claim,
restriction, security interest, mortgage, preferential right, option, defect in
title or similar encumbrance.

         Environmental Laws: any and all federal, state and local laws,
statutes, regulations, rules, orders, ordinances or permits of any governmental
authority pertaining to health, the environment, wildlife or natural resources
in effect in any and all jurisdictions in which the assets of Stingray or WCDC
are located, including, without limitation, the Clean Air Act, as amended, and
the Federal Water Pollution Control Act, as amended, the Rivers and Harbors Act
of 1899, as amended, the Safe Drinking Water Act, as amended, the Comprehensive
Environmental Response, Compensation and Liability Act, as amended, the
Superfund Amendments and Reauthorization Act of 1986, as amended, the Resource
Conservation and Recovery Act, as amended, the Hazardous and Solid Waste
Amendments Act of 1984, as amended, the Toxic Substances Control Act, as
amended, the Occupational Safety and Health Act, as amended, the Oil Pollution
Act, as amended, the Pipeline Safety Act, as amended, the Natural Gas Pipeline
Safety Act, as amended, the Hazardous Liquid Pipeline Safety Act, as amended,
and the Hazardous Materials Transportation Act, as amended.

         Governmental Authority: any court, governmental department,
commission, council, board, agency or other instrumentality of the United
States of America or any state, county, municipality or local government.

         LLC Agreement: the limited liability company agreement of Holdings, as
amended, restated, supplemented or otherwise modified to the date hereof.

         Holdings: as defined in the preamble.

         HSR Act: the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as
amended.

         Indemnified Party: as defined in Section 7.3.1.

         Indemnifying Party: as defined in Section 7.3.1.

         Indemnity Notice: as defined in Section 7.3.4.

         Legal Requirement: all applicable laws, rules, regulations, codes,
ordinances, permits, bylaws, variances, orders, conditions, and licenses of a
Governmental Authority.


                                       2

<PAGE>   6

         Loss: any loss, damage, cost, liability or expense (including
reasonable costs of defense and investigations, settlements, and reasonable
attorneys' and experts' fees) or penalties or fines.

         Membership Interest: as defined in the LLC Agreement.

         Notices: as defined in Section 10.5.

         Parties: Seller and Buyer.

         Party: Seller or Buyer.

         Person: an individual, partnership, corporation, limited liability
company, business trust, joint stock company, trust, unincorporated
association, joint venture, Governmental Authority or other entity of whatever
nature.

         Purchased Interest: as defined in the preamble.

         Purchase Price: as defined in Section 2.1.

         Reasonable Efforts: the efforts that a prudent person or entity
desirous of achieving a result would use in similar circumstances to ensure
that such result is achieved expeditiously; provided, however, that an
obligation to use Reasonable Efforts under this Agreement does not require the
person or entity subject to that obligation to take actions that would incur
any unreasonable out-of-pocket cost or expense in connection therewith.

         Seller: as defined in the preamble.

         Seller Indemnified Parties: as defined in Section 7.2.

         Taxes: all federal, state, local or foreign taxes, assessments or
other Governmental Authority charges, excluding income taxes, together with any
interest or penalties and other assessments thereon or related thereto.

         Third Party Claim: as defined in Section 7.3.1.

         1.2 Terminology. All article, section, subsection, schedule and
exhibit references used in this Agreement are to this Agreement unless
otherwise specified. All schedules and exhibits attached to this Agreement
constitute a part of this Agreement and are incorporated herein. Unless the
context of this Agreement clearly requires otherwise (a) the singular shall
include the plural and the plural shall include the singular wherever and as
often as may be appropriate, (b) the words "includes" or "including" shall mean
"including without limitation," and (c) the words "hereof," "herein,"
"hereunder," and similar terms in this Agreement shall refer to this Agreement
as a whole and not any particular section or article in which such words
appear. Currency amounts referenced herein are in United States Dollars.
References to

                                       3
<PAGE>   7

"generally accepted accounting principles" herein shall refer to such
principles in effect in the United States of America as of the date of the
statement to which such phrase refers.


                                   ARTICLE II
                               PURCHASE AND SALE

         2.1 The Transactions. Subject to and in accordance with the terms and
conditions of this Agreement, Seller agrees to sell, assign, convey and
transfer to Buyer, and Buyer agrees to purchase and accept from Seller, at the
Closing the Purchased Interest for an aggregate amount equal to $26,122,000
(the "Purchase Price").

         2.2 Closing. The closing of the transactions contemplated by this
Agreement (the "Closing") shall take place at the offices of Akin, Gump,
Strauss, Hauer & Feld, L.L.P., 1900 Pennzoil Place, South Tower, 711 Louisiana
Street, Houston, Texas 77002 commencing at 10:00 a.m., local time, on (i)
September 30, 1999, unless the conditions set forth in Sections 6.1 and 6.2
have not been fulfilled or waived by the applicable Party or (ii) such other
date as the Parties shall agree in writing. The date on which the Closing
actually occurs is referred to herein as the "Closing Date."

         2.3 Actions at Closing. At the Closing the following shall occur:

                  2.3.1 Seller will deliver Membership Interest certificates
         representing all of the Purchased Interest endorsed in blank and/or
         duly executed assignments of Membership Interest (in the form set
         forth in Exhibit "A") to Buyer, and

                  2.3.2 Buyer shall pay, or cause to be paid, to Seller an
         amount equal to the Purchase Price as set forth in Section 2.1. The
         amount payable by Buyer to Seller shall be payable by Buyer by wire
         transfer or delivery of other immediately available funds pursuant to
         Seller's instructions.


                                  ARTICLE III
                    REPRESENTATIONS AND WARRANTIES OF SELLER

         Seller hereby represents and warrants to Buyer that:

         3.1 Organization and Good Standing. Seller is a limited liability
company duly formed, validly existing and in good standing under the laws of
the State of Delaware. Seller is qualified to do business as a foreign
corporation in all other jurisdictions where failure to be so qualified would
have an adverse effect on the transactions contemplated hereby.

         3.2 Authority of Seller. Seller has all requisite limited liability
company power and authority to enter into this Agreement and the other
agreements contemplated herein to which it is a party, to consummate the
transactions contemplated hereby and to perform all the terms and conditions
hereof and thereof to be performed by it. The execution, delivery and
performance of



                                       4
<PAGE>   8

this Agreement and the other agreements contemplated herein by Seller and the
transactions contemplated hereby to be consummated by Seller have been duly
authorized by all requisite limited liability company action by Seller. This
Agreement and the other agreements contemplated herein have been duly executed
and delivered by Seller and constitute a valid and binding agreement of Seller
enforceable against it in accordance with its terms subject to applicable
bankruptcy, insolvency and other similar laws relating to or affecting the
enforcement of creditors' rights generally and to general principles of equity
(regardless of whether enforcement is considered in a proceeding in equity or
at law).

         3.3 No Violations. The execution and delivery of this Agreement by
Seller and the consummation of the transactions and agreements contemplated
herein to be consummated by Seller do not and will not:

                  3.3.1 violate any provision of its certificate of formation,
         limited liability company agreement, or any equivalent governing
         instruments of Seller, or the LLC Agreement;

                  3.3.2 violate any provision of or require any filing,
         consent, authorization or approval under any Legal Requirement binding
         upon Seller;

                  3.3.3 result in a breach of, constitute a default under, or
         require any consent, authorization or approval under (i) any mortgage,
         indenture, loan or credit agreement or any other agreement or
         instrument evidencing indebtedness for money borrowed, or any
         financing lease to which Seller is a party or by which it is bound or
         to which any of its assets is subject, or (ii) in any material
         respect, any other agreement or instrument to which either Seller is a
         party or by which it is bound or to which any of its assets is
         subject; or

                  3.3.4 result in the creation or imposition of any Encumbrance
         on any asset of Holdings.

         3.4 Title to Purchased Interest. Seller owns beneficially and of
record the Purchased Interest, free and clear of all Encumbrances. Seller has
full legal right to sell, assign and transfer the Purchased Interest to Buyer
and will, upon delivery of the assignment of Membership Interest in the form of
Exhibit "A", as well as the delivery of any appropriate certificates
representing the Purchased Interest to Buyer pursuant to the terms hereof,
transfer to Buyer good and valid title to the Purchased Interest free and clear
of any and all Encumbrances.

         3.5 Governmental and Third Party Approvals. No consent, approval,
waiver, order or authorization of, or registration, declaration or filing with,
any Governmental Authority or any other third party is required to be obtained
or made in connection with the execution and delivery of this Agreement by
Seller or the consummation by Seller of the transactions contemplated herein.


                                       5


<PAGE>   9

                                   ARTICLE IV
                    REPRESENTATIONS AND WARRANTIES OF BUYER

         Buyer hereby represents and warrants to Seller:

         4.1 Organization and Good Standing. Buyer is a Delaware limited
liability company duly formed, validly existing and in good standing under the
laws of the State of Delaware. Buyer is qualified to do business as a foreign
entity in all other jurisdictions where the properties now owned or leased by
Buyer or the nature of the business now conducted by it requires it to be so
qualified.

         4.2 Authority of Buyer. Buyer has all requisite limited liability
company power and authority to enter into this Agreement and the other
agreements contemplated herein to which it is a party, to consummate the
transactions contemplated hereby and to perform all the terms and conditions
hereof and thereof to be performed by it. The execution, delivery and
performance of this Agreement and the other agreements contemplated herein by
Buyer and the transactions contemplated hereby and thereby to be consummated by
Buyer have been duly authorized by all requisite limited liability company
action by Buyer. This Agreement and the other agreements contemplated herein
have been duly executed and delivered by Buyer and constitutes a valid and
binding agreement of Buyer enforceable against it in accordance with its terms
subject to applicable bankruptcy, insolvency and other similar laws relating to
or affecting the enforcement of creditors' rights generally and to general
principles of equity (regardless of whether enforcement is considered in a
proceeding in equity or at law).

         4.3 No Violations. The execution and delivery of this Agreement by
Buyer and the consummation of the transactions and agreements contemplated
herein to be consummated by Buyer do not and will not:

                  4.3.1 violate any provision of its certificate of formation,
         limited liability company agreement, or any equivalent governing
         instruments of Buyer;

                  4.3.2 violate any provision of or require any filing,
         consent, authorization or approval under any Legal Requirement binding
         upon Buyer;

                  4.3.3 conflict with, result in a breach of, constitute a
         default under, or require any consent, authorization or approval under
         (i) any mortgage, indenture, loan or credit agreement or any other
         agreement or instrument evidencing indebtedness for money borrowed, or
         any financing lease to which Buyer is a party or by which it is bound
         or to which any of its properties is subject or (ii) in any material
         respect, any other agreement or instrument to which Buyer is a party
         or by which it is bound or to which any of its properties is subject.

         4.4 Acquisition as Investment. Buyer or its designee, as appropriate,
is acquiring the Purchased Interest for its own account as an investment
without the present intent to sell, transfer or otherwise distribute the
Purchased Interest to any other person or entity.


                                       6

<PAGE>   10

         4.5 Brokerage or Finders Fees. Buyer and its Affiliates have no
liability or obligation to pay any fees or commissions to any broker, finder,
or agent with respect to the transactions contemplated by this Agreement.


                                   ARTICLE V
                      ADDITIONAL AGREEMENTS AND COVENANTS

         5.1 Covenants of Seller. Seller covenants and agree with Buyer as
follows:

                  5.1.1 Transaction Costs. Seller shall bear and pay all of the
         costs, fees and expenses incurred by or on behalf of it in connection
         with the transactions contemplated by this Agreement.

                  5.1.2 Tax Election. Seller agrees, and Seller will cause its
         affiliated member(s) of Holdings, if any, to agree, to timely make, in
         the 1999 Holdings' tax return, the election under Internal Revenue
         Code Section 754 to adjust the basis of partnership property in
         conjunction with the transfer of the Purchased Interest contemplated
         herein. In addition, Seller agrees to cause its affiliated members of
         Stingray Pipeline Company, L.L.C. and West Cameron Dehydration
         Company, L.L.C. to timely make, in the appropriate Stingray and WCDC
         tax returns, the election under Internal Revenue Code Section 754 to
         adjust the basis of partnership property in conjunction with the
         transfers of the purchased interests described in the Purchase and
         Sale Agreement dated of even date herewith by and between NGPL
         Offshore Company and MidCon Dehydration Corp as Sellers and Leviathan
         Gas Pipeline Partners, L.P., as Buyer.

         5.2 Covenants of Buyer. Buyer covenants and agrees with Seller as
follows:

                  5.2.1 Transaction Costs. Buyer shall bear and pay all of the
         costs, fees and expenses incurred by or on behalf of it in connection
         with the transactions contemplated by this Agreement.

                  5.2.2 Tax Election. Buyer agrees, and Buyer will cause its
         affiliated member(s) of Holdings, if any, to agree, to timely make, in
         the 1999 Holdings' tax return, the election under Internal Revenue
         Code Section 754 to adjust the basis of partnership property in
         conjunction with the transfer of the Purchased Interest contemplated
         herein.

         5.3 Mutual Covenants. Buyer and Seller each covenant and agree as
follows:

                  5.3.1 Transfer Taxes. Buyer and Seller shall be equally
         responsible for the payment of all state and local transfer, sales,
         use or other similar Taxes resulting from the transactions
         contemplated by this Agreement.

                  5.3.2 Reasonable Efforts. Subject to the terms and conditions
         of this Agreement, each Party will use its Reasonable Efforts to take,
         or cause to be taken, all actions and to do, or cause to be done, all
         things necessary, proper, or advisable under


                                       7


<PAGE>   11

         applicable Legal Requirements to consummate the transactions
         contemplated by this Agreement, including satisfying the conditions to
         closing.

                  5.3.3 Certain Filings. Buyer and Sellers shall cooperate with
         one another (i) in determining whether any action by or in respect of,
         or filing with, any Governmental Authority is required, or any
         actions, consents, approvals, or waivers are required to be obtained
         from parties to any material agreements, in connection with the
         consummation of the transactions contemplated by this Agreement, and
         (ii) in taking such actions or making such filings, furnishing
         information required in connection therewith and seeking timely to
         obtain such actions, consents, approvals, or waivers.

                  5.3.4 Notices of Certain Events. Each of the Buyer and Seller
         shall promptly notify the other Party hereto of:

                  (a) any notice or other communication from any Person
         alleging that the consent of such Person is or may be required in
         connection with the transactions contemplated by this Agreement;

                  (b) any notice or other communication from any Governmental
         Authority in connection with the transactions contemplated by this
         Agreement;

                  (c) any actions, suits, claims, investigations or proceedings
         commenced or, to its knowledge, threatened against, relating to, or
         involving or otherwise affecting such Party that, if pending on the
         date of this Agreement, would have been required to have been
         disclosed pursuant to any provision of this Agreement or that relate
         to the consummation of the transactions contemplated by this
         Agreement; and

                  (d) (i) the discovery by such party that any representation
         or warranty contained in this Agreement is untrue or inaccurate in any
         material respect, (ii) the occurrence or failure to occur of any event
         which occurrence or failure to occur would be likely to cause any of
         the representations or warranties in this Agreement to be untrue or
         incorrect in any material respect at the Closing Date, except for
         representations and warranties that speak as of a specified date,
         which need only be true and correct as of the specified date and (iii)
         any material failure on its part to comply with or satisfy any
         covenant, conditions or agreement to be complied with or satisfied by
         it hereunder; provided, however, that the delivery of any notice
         pursuant to this Section 5.3.4 shall not limit or otherwise affect the
         remedies available hereunder to the Party receiving such notice.


                                   ARTICLE VI
                             CONDITIONS TO CLOSING

         6.1 Buyer's Obligation to Close. Buyer's obligation to close under
this Agreement is subject to the fulfillment, on the Closing Date, of each of
the following conditions (except to the extent that Buyer shall have hereafter
agreed in writing to waive one or more of such conditions):


                                       8

<PAGE>   12

                  6.1.1 Litigation. There shall not be pending or threatened
         any litigation or proceeding (filed by a person or entity other than
         Buyer or its Affiliates) to restrain or prohibit any material portion
         of the transactions contemplated by this Agreement or to obtain
         material damages or other material relief in connection with the
         consummation of such transactions.

                  6.1.2 Compliance with Agreement. Seller shall have performed
         and complied in all material respects with all covenants required by
         this Agreement to be performed or complied with by Seller on or prior
         to the Closing.

                  6.1.3 Representations and Warranties. The representations and
         warranties of Seller contained in this Agreement shall be true and
         correct in all material respects on and as of the Closing Date, except
         that those representations and warranties which address matters only
         as of a particular date shall remain true and correct as of such date.

                  6.1.4 HSR. Buyer and Seller shall have made all necessary
         filings under the HSR Act with respect to the consummation of the
         transactions contemplated by this Agreement and have received early
         termination of the waiting period under the HSR Act with respect
         thereto.

                  6.1.5 Regulatory Approval. Prior to or simultaneously with
         the Closing hereunder, Buyer and Seller shall have received all
         required regulatory approvals and authorizations in form and substance
         acceptable to each Party.

                  6.1.6 Third Party Consents. Prior to or simultaneously with
         the Closing hereunder, Buyer and Seller shall have received all
         required third party consents and approvals to the transactions
         contemplated under this Agreement and the other agreements
         contemplated herein.

                  6.1.7 Closings. The closing of the transactions contemplated
         in the Contribution and Assignment Agreement dated of even date
         herewith between Affiliates of Buyer and Affiliates of Seller and
         other agreements contemplated therein shall occur immediately prior to
         the Closing hereunder.

         6.2 Seller's Obligation to Close. The obligation of Seller to close
under this Agreement is subject to the fulfillment on the Closing Date of each
of the following conditions (except to the extent that Seller shall have
hereafter agreed in writing to waive one or more of such conditions):

                  6.2.1 Litigation. There shall not be pending or threatened
         any litigation or proceeding (filed by a person or entity other than
         Seller or its Affiliates) to restrain or prohibit any material portion
         of the transactions contemplated by this Agreement or to obtain
         material damages or other material relief in connection with the
         consummation of such transactions.


                                       9

<PAGE>   13


                  6.2.2 Compliance with Agreement. Buyer shall have performed
         and complied in all material respects with all covenants required by
         this Agreement to be performed or complied with by Buyer on or prior
         to the Closing.

                  6.2.3 Representations and Warranties. The representations and
         warranties of Buyer contained in this Agreement shall be true and
         correct in all material respects on and as of the Closing Date, except
         that those representations and warranties which address matters only
         as of a particular date shall remain true and correct as of such date.

                  6.2.4 HSR. Buyer and Seller shall have made all necessary
         filings under the HSR Act with respect to the consummation of the
         transactions contemplated by this Agreement and have received early
         termination of the waiting period under the HSR Act with respect
         thereto.

                  6.2.5 Regulatory Approval. Prior to or simultaneously with
         the Closing hereunder, Buyer and Seller shall have received all
         required regulatory approvals and authorizations in form and substance
         acceptable to each Party.

                  6.2.6 Third Party Consents. Prior to or simultaneously with
         the Closing hereunder, Buyer and Seller shall have received all
         required third party consents and approvals to the transactions
         contemplated under this Agreement and the other agreements
         contemplated herein.

                  6.2.7 Closings. The closing of the transactions contemplated
         in the Contribution and Assignment Agreement dated of even date
         herewith between Affiliates of Buyer and Affiliates of Seller and
         other agreements contemplated therein shall occur immediately prior to
         the Closing hereunder.


                                  ARTICLE VII
                                INDEMNIFICATION

         7.1 Indemnification of Buyer. Seller shall indemnify and defend Buyer,
its Affiliates (including any Affiliates designated by Buyer to purchase the
Purchased Interest if the Closing occurs) and their directors, officers,
employees, contractors, agents and other representatives (each a "Buyer
Indemnified Party") against, and hold each Buyer Indemnified Party harmless
from any Loss that such Buyer Indemnified Party incurs to the extent arising
out of or resulting from any of the following:

                  7.1.1 the failure of any of the representations and
         warranties of Seller contained in this Agreement to be true and
         correct as of the date made or the inaccuracy of any such
         representation or warranty as of the date made; or

                  7.1.2 Seller's breach or the failure of Seller to perform or
         satisfy in any material respect any covenant made by, or other
         obligation of, Seller herein.


                                       10

<PAGE>   14

         7.2 Indemnification of Seller. Subject to Sections 7.4 and 7.5, Buyer
shall indemnify and defend Seller and its Affiliates and their directors,
officers, employees, contractors, agents and other representatives ("Seller
Indemnified Parties") against, and hold each Seller Indemnified Party harmless
from any Loss that such Seller Indemnified Party incurs, to the extent arising
out of or resulting from any of the following:

                  7.2.1 the failure of any of the representations and
         warranties of Buyer contained in this Agreement to be true and correct
         as of the date made or the inaccuracy of any such representation or
         warranty as of the date made; or

                  7.2.2 Buyer's breach or the failure of Buyer to perform or
         satisfy in any material respect any covenant made by, or other
         obligation of, Buyer herein.

         7.3 Indemnification Procedures. All claims for indemnification under
this Agreement shall be asserted and resolved as follows:

                  7.3.1 A party claiming indemnification under this Agreement
         (an "Indemnified Party") with respect to any third-party Claim or
         Claims asserted against the Indemnified Party ("Third Party Claim")
         that could give rise to a right of indemnification under this
         Agreement shall promptly (a) notify the party from whom
         indemnification is sought (the "Indemnifying Party") of the Third
         Party Claim and (b) transmit to the Indemnifying Party a written
         notice ("Claim Notice") describing in reasonable detail the nature of
         the Third Party Claim, a copy of all papers served with respect to
         such Third Party Claim (if any), the Indemnified Party's best estimate
         of the amount of damages attributable to the Third Party Claim and the
         basis of the Indemnified Party's request for indemnification under
         this Agreement. Subject to Section 7.3.2, failure to provide such
         Claim Notice shall not affect the right of the Indemnified Party's
         indemnification hereunder except to the extent the Indemnifying Party
         is prejudiced thereby. Within 30 days after receipt of any Claim
         Notice (the "Election Period"), the Indemnifying Party shall notify
         the Indemnified Party (x) whether the Indemnifying Party disputes its
         potential liability to the Indemnified Party under this Article VII
         with respect to such Third Party Claim and (y) whether the
         Indemnifying Party desires to defend the Indemnified Party against
         such Third Party Claim; provided that if the Indemnifying Party fails
         to so notify the Indemnified Party during the Election Period, the
         Indemnifying Party shall be deemed to have elected to dispute such
         liability.

                  7.3.2 If the Indemnifying Party notifies the Indemnified
         Party within the Election Period that the Indemnifying Party does not
         dispute its potential liability to the Indemnified Party under this
         Article VII and that the Indemnifying Party elects to assume the
         defense of the Third Party Claim, then the Indemnifying Party shall
         have the right to defend, at its sole cost and expense, such Third
         Party Claim by all appropriate proceedings, which proceedings shall be
         prosecuted diligently by the Indemnifying Party to a final conclusion
         or settled at the discretion of the Indemnifying Party in accordance
         with this Section 7.3.2. The Indemnifying Party shall have full
         control of such defense and proceedings, including any compromise or
         settlement thereof; provided that the Indemnifying Party shall not
         enter into any settlement agreement providing for a finding

                                       11

<PAGE>   15

         of responsibility or liability on the part of the Indemnified Party or
         providing any material sanction or material restriction upon the
         conduct of any business by the Indemnified Party without the
         Indemnified Party's consent, which consent shall not unreasonably be
         withheld. The Indemnified Party is hereby authorized, at the sole cost
         and expense of the Indemnifying Party (but only if the Indemnified
         Party is actually entitled to indemnification hereunder), to file,
         during the Election Period, any motion, answer or other pleadings
         which the Indemnified Party shall deem necessary or appropriate to
         protect its interests or those of the Indemnifying Party and not
         prejudicial to the Indemnifying Party (it being understood and agreed
         that if an Indemnified Party takes any such action, the Indemnifying
         Party shall be relieved of its obligations hereunder with respect to
         such Third Party Claim to the extent that such action prejudiced the
         Indemnifying Party). If requested by the Indemnifying Party, the
         Indemnified Party agrees, at the sole cost and expense of the
         Indemnifying Party, to cooperate with the Indemnifying Party and its
         counsel in contesting any Third Party Claim which the Indemnifying
         Party elects to contest, including the making of any related
         counterclaim against the person or entity asserting the Third Party
         Claim or any cross-complaint against any person or entity. The
         Indemnified Party may participate in, but not control, any defense or
         settlement or any Third Party Claim controlled by the Indemnifying
         Party pursuant to this Section 7.3, and the Indemnified Party shall
         bear its own costs and expenses with respect to such participation.

                  7.3.3 If the Indemnifying Party fails to notify the
         Indemnified Party within the Election Period that the Indemnifying
         Party elects to defend the Indemnified Party pursuant to Section
         7.3.2, or if the Indemnifying Party elects to defend the Indemnified
         Party pursuant to Section 7.3.2 but fails to diligently prosecute or
         settle the Third Party Claim, then the Indemnified Party shall have
         the right to defend, at the sole cost and expense of the Indemnifying
         Party (but only if the Indemnified Party is actually entitled to
         indemnification hereunder), the Third Party Claim by all appropriate
         proceedings, which proceedings shall be promptly and vigorously
         prosecuted by the Indemnified Party to a final conclusion or settled.
         The Indemnified Party shall have full control of such defense and
         proceedings; provided, however, that the Indemnified Party may not
         enter into, without the Indemnifying Party's consent, which shall not
         be unreasonably withheld, any compromise or settlement of such Third
         Party Claim. The Indemnifying Party may participate in, but not
         control, any defense or settlement controlled by the Indemnified Party
         pursuant to this Section 7.3.3, and the Indemnifying Party shall bear
         its own costs and expenses with respect to such participation.

                  7.3.4 In the event any Indemnified Party should have a claim
         against any Indemnifying Party hereunder which does not involve a
         Third Party Claim, the Indemnified Party shall promptly transmit to
         the Indemnifying Party a written notice (the "Indemnity Notice")
         describing in reasonable detail the nature of the claim, the
         Indemnified Party's best estimate of the amount of damages
         attributable to such claim and the basis of the Indemnified Party's
         request for indemnification under this Agreement. If the Indemnifying
         Party does not notify the Indemnified Party within 60 days from its
         receipt of the Indemnity Notice that the Indemnifying Party disputes
         such claim, the Indemnifying Party shall be deemed to have disputed
         such claim. If the


                                       12

<PAGE>   16

         Indemnifying Party has disputed (or is deemed to have disputed) such
         claim, such dispute shall be resolved by arbitration in accordance
         with Section 9.1.

         7.4 Negligence. SUBJECT TO SECTION 7.5, AN INDEMNIFIED PARTY SHALL BE
ENTITLED TO INDEMNIFICATION HEREUNDER IN ACCORDANCE WITH THE TERMS HEREOF,
REGARDLESS OF WHETHER THE LOSS OR CLAIM GIVING RISE TO SUCH INDEMNIFICATION
OBLIGATION IS THE RESULT OF THE SOLE, JOINT, CONCURRENT OR COMPARATIVE
NEGLIGENCE, STRICT LIABILITY OR VIOLATION OF ANY LAW OF OR BY SUCH INDEMNIFIED
PARTY. THE PARTIES AGREE THAT THIS PARAGRAPH CONSTITUTES A CONSPICUOUS LEGEND.

         7.5 Limitation on Liabilities.

                  7.5.1 BUYER AND SELLER (I) AGREE THAT ONLY ACTUAL DAMAGES
         SHALL BE RECOVERABLE UNDER THIS AGREEMENT AND (II) HEREBY WAIVE ANY
         RIGHT TO RECOVER, AND AGREE THAT THE TERM LOSSES SHALL NOT COVER,
         SPECIAL, PUNITIVE, CONSEQUENTIAL, INCIDENTAL OR EXEMPLARY DAMAGES
         (WHETHER BASED ON STATUTE, CONTRACT, TORT OR OTHERWISE, AND WHETHER OR
         NOT ARISING FROM THE INDEMNIFYING PARTY'S SOLE, JOINT OR CONCURRENT
         NEGLIGENCE, STRICT LIABILITY OR OTHER FAULT) EXCEPT TO THE EXTENT ANY
         SUCH PARTY SUFFERS SUCH DAMAGES TO AN UNAFFILIATED THIRD-PARTY IN
         CONNECTION WITH A THIRD-PARTY CLAIM, IN WHICH EVENT SUCH DAMAGES SHALL
         BE RECOVERABLE.

         7.6 Survival. The representations and warranties in Article III shall
survive the Closing solely for purposes of this Article VII and shall terminate
four years and six months after the Closing Date. The representations and
warranties in Article IV shall survive the Closing solely for purposes of this
Article VII and shall terminate four years and six moths after the Closing
Date. No Claim can be brought with respect to any inaccuracy or failure of any
representation and warranty under this Agreement unless a Claim Notice or
Indemnity Notice specifying the inaccuracy or failure of the representation or
warranty forming the basis of such Claim has been delivered to the Party making
such representation or warranty prior to the termination date of such
representation or warranty as described in this Section 7.6. Notwithstanding
anything to the contrary in this Agreement, the indemnification provisions of
this Agreement shall be the exclusive remedies for any Claim based upon this
Agreement or the transactions described herein following Closing. In
furtherance of the foregoing, all other remedies available at law or in equity,
in tort, contract or otherwise are hereby waived, released and discharged by
Seller and Buyer.

                                       13
<PAGE>   17

                                  ARTICLE VIII
                               TERMINATION RIGHTS

         8.1 Termination. This Agreement may be terminated and the transactions
contemplated hereby abandoned as follows:

                  8.1.1 By the mutual written consent of Buyer and Seller at
         any time prior to the Closing;

                  8.1.2 By Buyer or Seller if an order to restrain, enjoin or
         otherwise prevent the consummation of the transactions contemplated
         hereby shall have been entered;

                  8.1.3 By Seller at any time prior to the Closing if the
         Closing shall not have occurred on or before September 30, 1999 by
         reason of a failure of any condition precedent under Section 6.2
         unless the failure results primarily from the breach by Seller of any
         representation, warranty or covenant contained in this Agreement; or

                  8.1.4 By Buyer at any time prior to the Closing if the
         Closing shall not have occurred on or before September 30, 1999 by
         reason of a failure of any condition precedent under Section 6.1,
         unless the failure results primarily from Buyer itself breaching any
         representation, warranty or covenant contained in this Agreement.

         8.2 Effect of Termination. In the event of any termination of this
Agreement pursuant to Section 8.1, (a) Seller and Buyer shall have no
obligation or liability to each other except that the provisions of Article
VII, IX and X shall survive any such termination, and (b) nothing herein and no
termination pursuant hereto will relieve any party from liability for any
breach of this Agreement prior to such termination or, with respect to those
provisions that survive such termination, prior to or following termination.


                                   ARTICLE IX
                                  ARBITRATION

         9.1 Arbitration.

                  9.1.1 Any and all claims, counterclaims, demands, cause of
         action, disputes, controversies, and other matters in question arising
         out of or relating to this Agreement, any provision hereof, the
         alleged breach of any such provision, or in any way relating to the
         subject matter of this Agreement or the relationship between the
         Parties created by this Agreement, involving the Parties and/or their
         respective representatives (all of which are referred to herein as
         "Claims"), even though some or all of such Claims allegedly are
         extra-contractual in nature, whether such Claims sound in contract,
         tort, or otherwise, at law or in equity, under State or federal law,
         whether provided by statute or the common law, for damages or any
         other relief, shall be resolved by binding arbitration in accordance
         with this Section 9.1.


                                       14
<PAGE>   18

                  9.1.2 It is the intention of the Parties that the arbitration
         shall be conducted pursuant to the Federal Arbitration Act, as such
         Act is modified by this Agreement. The validity, construction, and
         interpretation of this Section 9.1, and all procedural aspects of the
         arbitration conducted pursuant to this Section 9.1, including the
         determination of the issues that are subject to arbitration (i.e.,
         arbitrability), the scope of the arbitrable issues, allegations of
         "fraud in the inducement" to enter into this Agreement, or this
         arbitration provision, allegations of waiver, laches, delay or other
         defenses to arbitrability, and the rules governing the conduct of the
         arbitration (including the time for filing an answer, the time for the
         filing of counterclaims, the times for amending the pleadings, the
         specificity of the pleadings, the extent and scope of discovery, the
         issuance of subpoenas, the times for the designation of experts,
         whether the arbitration is to be stayed pending resolution of related
         litigation involved third parties not bound by this Agreement, the
         receipt of evidence, and the like), shall be decided by the
         arbitrators. The arbitration shall be administered by the American
         Arbitration Association (the "AAA"), and shall be conducted pursuant
         to the Commercial Arbitration Rules of the AAA, as modified by this
         Agreement. In deciding the substance of the parties' Claims, the
         arbitrators shall refer to the substantive laws of the State of Texas
         for guidance (excluding Texas choice-of-law principles that might call
         for the application of some other State's law). Notwithstanding any
         other provision in this Section 9.1 to the contrary, the Parties
         expressly agree that the arbitrators shall have absolutely no
         authority to award incidental, special, treble, exemplary or punitive
         damages of any type under any circumstances regardless of whether such
         damages may be available under Texas law, the law of any other State,
         or federal law, or under the Federal Arbitration Act, or under the
         Commercial Arbitration Rules of the AAA, the parties hereby waiving
         their right, if any, to recover incidental, special, treble, exemplary
         or punitive damages in connection with any such Claims.

                  9.1.3 The arbitration proceeding shall be conducted in
         Houston, Texas before a panel of three arbitrators appointed in
         accordance with the Commercial Arbitration Rules of the AAA consisting
         of persons from any of the following categories: (i) attorneys having
         practiced in the area of natural gas transportation law for at least
         ten (10) years, (ii) engineers with at least ten (10) years of
         experience in the natural gas transportation industry, or (iii)
         accountants with at least ten (10) years of experience in the natural
         gas transportation industry. The arbitrators shall conduct a hearing
         as soon as reasonably practicable after appointment of the third
         arbitrator, and a final decision completely disposing of all Claims
         that are the subject of the arbitration proceedings shall be rendered
         by the arbitrators as soon as reasonably practicable after the
         hearing. There shall be no transcript of the hearing before the
         arbitrators. The arbitrators' ultimate decision after final hearing
         shall be in writing, but shall be as brief as possible, and the
         arbitrators shall not assign reasons for their ultimate decision. In
         case the arbitrators award monetary damages to either Party, the
         arbitrators shall certify in their award that they have not included
         any incidental, special, treble, exemplary or punitive damages.

                  9.1.4 The fees and expenses of the arbitrators shall be borne
         equally by the Parties, but the decision of the arbitrators may
         include such award of the arbitrators' fees and expenses and of other
         costs and attorneys' fees as the arbitrators determine appropriate.

                                       15
<PAGE>   19

                  9.1.5 To the fullest extent permitted by law, the arbitration
         proceeding and the arbitrators' award shall be maintained in
         confidence by the Parties.

                  9.1.6 The award of the arbitrators shall be binding upon the
         parties and final and nonappealable to the maximum extent permitted by
         law, and judgment thereon may be entered in a court of competent
         jurisdiction and enforced by any Party as a final judgment of such
         court.


                                   ARTICLE X
                                    GENERAL

         10.1 Exclusive Agreement. This Agreement and the attached exhibit set
forth the entire agreement and understanding of the Parties in respect of the
transactions contemplated hereby and supersede all prior agreements,
arrangements and undertakings (oral or written) relating to the subject matter
hereof. No representation, promise, inducement or statement of intention has
been made by any Party which is not embodied in or superseded by this Agreement
or in the agreements and documents to be executed pursuant hereto, and no Party
shall be bound by or liable for any alleged representation, promise, inducement
or statement of intention not so set forth.

         10.2 Successors and Assigns. All of the terms, covenants,
representations, warranties and conditions of this Agreement shall be binding
upon, and inure to the benefit of, and be enforceable by, the Parties and their
respective permitted successors and assigns (and in the case of indemnities to
the benefit of all persons indemnified). This Agreement and the rights and
obligations hereunder shall not be assigned by any Party hereto without the
prior written consent of the other Party.

         10.3 Amendments. This Agreement may be amended, modified, superseded
or canceled, and any of the terms, covenants, representations, warranties or
conditions hereof may be waived, only by a written instrument executed by the
Parties, or, in the case of a waiver, by or on behalf of the Party waiving
compliance. The failure of any Party at any time or times to require
performance of any provisions hereof shall in no manner affect the right at a
later time to enforce the same. No waiver by any Party of any condition, or of
any breach of any term, covenant, representation or warranty contained in this
Agreement, in any one or more instances, shall be deemed to be or construed as
a further or continuing waiver of any such condition or breach or a waiver of
any other condition or of any breach of any other term, covenant,
representation or warranty.

         10.4 Further Assurances. Each Party agrees to execute such further
instruments or documents as the other Party may from time to time reasonably
request in order to confirm or carry out the transactions contemplated in this
Agreement; provided that no such instrument or document shall expand a Party's
liability beyond that contemplated in this Agreement.


                                       16
<PAGE>   20

         10.5 Notices. All notices, requests, demands and other communications
(collectively, "Notices") required or permitted to be given hereunder shall be
in writing and delivered personally, or by facsimile transmission or mailed
first class, postage prepaid, registered or certified mail, as follows:

         If to Buyer, to:

         ANR Western Gulf Holdings, L.L.C.
         500 Renaissance Center
         Detroit, Michigan 48243
         Attention:  President
         Facsimile:  (313) 496-3555


         If to Seller, to:

         Leviathan Deepwater, L.L.C.
         El Paso Energy Building
         1001 Louisiana
         Houston, Texas  77002
         Attention:   President
         Facsimile Number: (713) 420-5472

All Notices shall be effective upon receipt. Any Party may change its Notice
address by giving written Notice to the other in the manner specified above.

         10.6 Governing Law. THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED
AND ENFORCED IN ACCORDANCE WITH THE LAWS OF THE STATE OF TEXAS WITHOUT REGARD
TO CONFLICT OF LAW PRINCIPLES.

         10.7 Severability. In the event any of the provisions hereof are held
to be invalid or unenforceable under any Legal Requirement, the remaining
provisions hereof shall not be affected thereby. In such event, the Parties
agree and consent that such provisions and this Agreement shall be modified and
reformed so as to effect the original intent of the Parties as closely as
possible with respect to those provisions which were held to be invalid or
unenforceable.

         10.8 Counterparts. This Agreement may be executed simultaneously in
two or more counterparts, each of which shall be deemed an original, but all of
which shall constitute but one agreement.

         10.9 Expenses. Except as expressly provided in this Agreement, whether
or not the transactions contemplated hereby are consummated, each Party shall
pay its own expenses incident to the preparation of the Agreement and for
consummating the transaction.

           [The remainder of this page is intentionally left blank.]


                                       17
<PAGE>   21


         IN WITNESS WHEREOF, the Parties have duly executed this instrument the
day and year first above written.

SELLER:

LEVIATHAN DEEPWATER, L.L.C.


By:     /s/ T. DARTY SMITH
       -----------------------------------
Name:       T. Darty Smith
       -----------------------------------
Title:      Vice President
       -----------------------------------



BUYER:

ANR WESTERN GULF HOLDINGS, L.L.C.


By:     /s/ WILLIAM L. JOHNSON
       -----------------------------------
Name:       William L. Johnson
       -----------------------------------
Title:      Senior Vice President
       -----------------------------------



Exhibit A:  Form of Assignment

<PAGE>   22



                                   EXHIBIT A

                                   Assignment


         This Assignment is made and entered into as of September ___, 1999 by
and between Leviathan Deepwater, a Delaware limited liability company
("Assignor") and ANR Western Gulf Holdings, L.L.C., a Delaware limited
liability company ("Assignee").

         WHEREAS, in accordance with that certain Purchase and Sale Agreement
dated as of September __, 1999 (the "Purchase and Sale Agreement") between
Assignor and Assignee, Assignor desires to assign the Subject Interest (herein
defined) to Assignee;

         NOW, THEREFORE, for and in consideration of the premises and the
mutual covenants and agreements contained herein and other good and valuable
consideration (the receipt and sufficiency of which are hereby confirmed and
acknowledged), the parties hereto hereby stipulate and agree as follows:

         1. Assignment. Assignor hereby assigns, conveys, transfers, and
contributes to Assignee, on the terms herein provided, all of its rights, title
and interest in and to the property described on Exhibit "A" attached hereto
(the "Subject Interest"). The Subject Interest is being assigned, along with
other contributions, assignments and commitments, to Assignor in exchange for
the execution and delivery of this Assignment and the other agreements executed
in connection with the Purchase and Sale Agreement.

         2. Purchase and Sale Agreement. THIS ASSIGNMENT IS SUBJECT TO THE
TERMS AND CONDITIONS OF THE PURCHASE AND SALE AGREEMENT, INCLUDING WITHOUT
LIMITATION THE PROVISIONS THEREOF THAT LIMIT IN CERTAIN RESPECTS THE LIABILITY
OF ASSIGNOR IN CONNECTION HEREWITH AND SET FORTH THE EXCLUSIVE REMEDIES OF THE
PARTIES IN CONNECTION HEREWITH.

         3. Entire Agreement. This Assignment, the Purchase and Sale Agreement
and the other agreements executed in connection and contemporaneously herewith
constitute the entire agreement and supersede all prior (oral or written) or
oral contemporaneous proposals or agreements, all previous negotiations and all
other communications or understandings between the parties hereto with respect
to the subject matter hereof.

         4. Amendment and Modification. All amendments, supplements and
modifications to this Assignment shall be in writing and signed by each of the
parties hereto.

         5. Counterparts. This Assignment may be executed in multiple
counterparts, each of which, when executed, shall be deemed an original, and
all of which shall constitute but one and the same instrument.

         6. Parties Bound by Agreement. This Assignment shall be binding upon
and shall inure to the benefit of the Parties and their respective successors
and assigns.

                                   EXHIBIT A
                                     Page 1

<PAGE>   23

         7. Governing Law. THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED
AND ENFORCED IN ACCORDANCE WITH THE LAWS OF THE STATE OF TEXAS WITHOUT REGARD
TO CONFLICT OF LAW PRINCIPLES.

         8. Exhibits and Schedules. All exhibits, schedules and the like
contained herein or attached hereto are integrally related to this Assignment,
and are hereby made a part of this Assignment for all purposes.

         9. Further Assurances. Subject to the terms and conditions set forth
in this Assignment, each of the parties hereto agrees to use all reasonable
efforts to take, or to cause to be taken, all actions, and to do, or to cause
to be done, all things necessary, proper or advisable under applicable laws and
regulations to consummate and make effective the transactions contemplated by
this Assignment. In case, at any time after the execution of this Assignment,
any further action is necessary or desirable to carry out its purposes, the
proper officers or directors of the parties hereto shall take or cause to be
taken all such necessary action.

         10. Severability. Any term or provision of this Assignment that is
invalid or unenforceable in any jurisdiction shall be ineffective as to such
jurisdiction, to the extent of such invalidity or unenforceability, without
rendering invalid or unenforceable the remaining terms and provisions of this
Assignment or affecting the validity or enforceability of any terms and
provisions of this Assignment in any other jurisdiction. If any provision of
this Assignment is so broad as to be unenforceable, such provision shall be
interpreted to be only so broad as is enforceable.



           [The remainder of this page is intentionally left blank.]

                                   EXHIBIT A
                                     Page 2

<PAGE>   24

         IN WITNESS WHEREOF, the undersigned have executed this Assignment as
of the date first above written.

                                 ASSIGNOR:

                                 LEVIATHAN DEEPWATER, L.L.C.


                                 By:
                                       -----------------------------------
                                 Name:
                                       -----------------------------------
                                 Title:
                                       -----------------------------------



                                 ASSIGNEE

                                 ANR WESTERN GULF HOLDINGS, L.L.C.


                                 By:
                                       -----------------------------------
                                 Name:
                                       -----------------------------------
                                 Title:
                                       -----------------------------------

AGREED TO AND ACCEPTED
THIS ___ DAY OF SEPTEMBER, 1999


DEEPWATER HOLDINGS, L.L.C.


By:
         -----------------------------------
Name:
         -----------------------------------
Title:
         -----------------------------------


                                   EXHIBIT A
                                     Page 3
<PAGE>   25

                            Exhibit A to Assignment


A 9.66% membership interest in Deepwater Holdings, L.L.C., a Delaware limited
liability company.





                                   EXHIBIT A
                                     Page 4

<PAGE>   1
                    AMENDMENT NO. 1 TO FABRICATION AGREEMENT

         This Amendment No. 1 (this "Amendment") dated as of August 31, 1999, to
that certain Fabrication Agreement made and entered into as of July 16, 1999 (as
in effect on the date hereof, the "Contract") by and between DELOS OFFSHORE
COMPANY ("Company"), a Delaware limited liability company, and MODEC
INTERNATIONAL LLC ("Contractor"), a Delaware limited liability company, is
entered into by and between Company and Contractor. Hereinafter, Company and
Contractor may be referred to individually as a "Party" and collectively as the
"Parties."

                              W I T N E S S E T H:

         WHEREAS, Company and Contractor are parties to the Contract wherein
Contractor agreed to design, fabricate, assemble and deliver facilities in
accordance with the terms of such Contract, and Company agreed to pay for such
Work (as defined in the Contract) performed by Contractor; and

         WHEREAS, Company and Contractor now desire to amend the Contract to (i)
redefine the order of priority of the appendices in the event of any conflict
between the provisions of the Contract Documents (as defined in the Contract),
and (ii) modify the notice periods specified in certain of the provisions of the
Contract.

         NOW, THEREFORE in consideration of the premises contained herein and
for other good and valuable consideration, the receipt and sufficiency of which
are hereby acknowledged, Company and Contractor hereby stipulate and agree as
follows:

         1. Definitions. Terms defined in this Amendment have the meanings
specified herein, and capitalized terms not defined herein, but defined in the
Contract, are used herein as therein defined.

         2. Amendments. The Contract shall be and is hereby amended as follows:

               A. Article 2.3 is hereby amended by deleting subsections (a), (b)
          and (c) in their entirety, and substituting the following:

               a) this Fabrication Agreement,

               b) Appendices A, B, C, E, F, G, H, K, N, M, L, J, I, O, P and D.

               B. Section 6.2 is hereby amended by replacing the term "seven (7)
          Days" each time it appears in the second and third paragraphs with the
          term "14 Days."

               C. Section 12.2 is hereby amended by replacing the phrase "within
          seven (7) Days" in the first paragraph with the following phrase:




<PAGE>   2

               "within 21 Days (except with respect to offshore Work, in which
               case it shall be submitted within two (2) Days)".

               D. Article 16.1 is hereby amended by replacing the phrase "within
          seven (7) Days" in the first paragraph with the following phrase:

               "within 21 Days (except with respect to offshore Work, in which
               case it shall be prepared within two (2) Days)".

                  Article 16.1 is further amended by replacing the phrase
          "within seven (7) Days" in the second paragraph with the following
          phrase:

               "within 21 Days (except with respect to offshore Work, in which
               case it shall be presented within two (2) Days)".

                  Article 16.1 is further amended by replacing the phrase
          "within seven (7) Days" in the fourth paragraph with the following
          phrase:

               "within 21 Days (except with respect to offshore Work, in which
               case it shall be informed within two (2) Days)".

               E. Article 28.2 is hereby amended by replacing the term "14 Days"
          in the first line with "21 Days."

         3. No Other Waivers or Amendments. Except as expressly waived or
amended hereby, the Contract shall remain in full force and effect in accordance
with its terms, without any waiver, amendment or modification of any provision
thereof.

         4. Successors and Assigns. This Amendment shall be binding upon and
inure to the benefit of the Parties and their respective successors and
permitted assigns.

         5. Counterparts. This Amendment may be executed by one or more of the
Parties on any number of separate counterparts and all of said counterparts
taken together shall be deemed to constitute one and the same instrument.

         6. Governing Law. THIS AMENDMENT SHALL BE GOVERNED BY, AND CONSTRUED
AND INTERPRETED IN ACCORDANCE WITH, THE LAW OF THE STATE OF TEXAS, WITHOUT
REGARD TO ANY CONFLICTS OF LAWS PRINCIPLES WHICH, IF APPLIED, MIGHT PERMIT OR
REQUIRE THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION.


               [Remainder of this page intentionally left blank.]



                                        2
<PAGE>   3

         IN WITNESS WHEREOF, the Parties have caused this Amendment No. 1 to
Fabrication Agreement to be signed by their respective duly authorized
representatives effective as of the day and year first written in the preamble.


                                               COMPANY:

                                               DELOS OFFSHORE COMPANY, L.L.C.


                                               /s/ JAMES H. LYTAL
                                               ---------------------------------
                                               James H. Lytal
                                               President




                                               CONTRACTOR:

                                               MODEC INTERNATIONAL LLC


                                               /s/ K. MATSUNAGA
                                               ---------------------------------
                                               K. Matsunaga
                                               President
<PAGE>   4
                                                                   EXHIBIT 10.20


                        SUNDAY SILENCE FIELD DEVELOPMENT


                              FABRICATION AGREEMENT


                          DELOS OFFSHORE COMPANY, L.L.C.
                                     HOUSTON

                                    JULY 1999

<PAGE>   5
DELOS OFFSHORE COMPANY, L.L.C.                  SUNDAY SILENCE FIELD DEVELOPMENT
                                                           FABRICATION AGREEMENT
================================================================================

                                TABLE OF CONTENTS
<TABLE>
<S>                                                                             <C>
PART 1    GENERAL PROVISIONS.........................................................1

     ART. 1    DEFINITIONS...........................................................1
     ART. 2    CONTRACT DOCUMENTS - INTERPRETATION...................................4
     ART. 3    REPRESENTATIVES OF THE PARTIES........................................5

PART 2    PERFORMANCE OF THE WORK....................................................5

     ART. 4    OBLIGATIONS OF CONTRACTOR - MAIN RULES................................5
     ART. 5    AUTHORITY REQUIREMENTS - PERMITS......................................6
     ART. 6    DRAWING - SPECIFICATIONS - COMPANY PROVIDED ITEMS.....................7
     ART. 7    SUBCONTRACTS..........................................................8
     ART. 8    LABOR FOR THE WORK....................................................9
     ART. 9    MINERALS MANAGEMENT SERVICE (MMS) OBLIGATIONS.........................9
     ART. 10   QUALITY ASSURANCE.....................................................9

PART 3    PROGRESS OF THE WORK......................................................10

     ART. 11   CONTRACT SCHEDULE - DELAYED PROGRESS.................................10

PART 4    VARIATIONS AND CANCELLATION...............................................11

     ART. 12   RIGHT TO VARY THE WORK...............................................11
     ART. 13   EFFECTS OF A VARIATION TO THE WORK...................................11
     ART. 14   ISSUE OF VARIATION ORDERS............................................12
     ART. 15   CONSEQUENCES OF VARIATION ORDERS - DISPUTES ABOUT CONSEQUENCES.......12
     ART. 16   DISPUTE AS TO WHETHER A VARIATION TO THE WORK EXISTS - DISPUTED
               VARIATION ORDER......................................................13
     ART. 17   CANCELLATION.........................................................14
     ART. 18   COMPANY'S RIGHT TEMPORARILY TO SUSPEND THE WORK......................16

PART 5    DELIVERY AND PAYMENT......................................................16

     ART. 19   DELIVERY AND COMPLETION OF THE WORK..................................16
     ART. 20   PAYMENT OF THE CONTRACT PRICE, INVOICING AND AUDIT...................17
     ART. 21   GUARANTEE............................................................19
     ART. 22   TITLE TO THE CONTRACT OBJECT - RIGHT TO DEMAND DELIVERY..............19
     ART. 23   CONTRACTOR GUARANTEE - ACCEPTANCE CERTIFICATE........................20

PART 6    BREACH OF CONTRACT........................................................22

     ART. 24   CONTRACTOR'S DELAY...................................................22
     ART. 25   CONTRACTOR'S DEFECTS AND GUARANTEE LIABILITY.........................24
     ART. 26   TERMINATION DUE TO CONTRACTOR'S BREACH OF CONTRACT...................25
     ART. 27   COMPANY'S BREACH OF CONTRACT.........................................26

PART 7    FORCE MAJEURE.............................................................27

     ART. 28   EFFECTS OF FORCE MAJEURE.............................................27

PART 8    LIABILITY AND INSURANCES..................................................28

     ART. 29   LOSS OF OR DAMAGE TO THE CONTRACT OBJECT OR COMPANY PROVIDED ITEMS...28
     ART. 30   EXCLUSION OF LIABILITY - INDEMNIFICATION.............................29
     ART. 31   INSURANCES...........................................................34

PART 9    PROPRIETARY RIGHTS, ETC...................................................34

     ART. 32   RIGHTS TO DOCUMENTS AND COMPUTER PROGRAMS............................34
     ART. 33   INVENTIONS...........................................................35
</TABLE>


                                       i
<PAGE>   6
DELOS OFFSHORE COMPANY, L.L.C.                  SUNDAY SILENCE FIELD DEVELOPMENT
                                                           FABRICATION AGREEMENT
================================================================================

<TABLE>
<S>                                                                             <C>

     ART. 34   CONFIDENTIAL INFORMATION.............................................36

PART 10        OTHER PROVISIONS.....................................................37

     ART. 35   ASSIGNMENT OF THE CONTRACT, ETC......................................37
     ART. 36   NOTICES..............................................................37
     ART. 37   UNITED STATES LAW AND DISPUTES.......................................37
     ART. 38   EQUAL EMPLOYMENT OPPORTUNITY PROVISIONS..............................38
     ART. 39   POLLUTION CONTROL AND RESPONSIBILITY.................................41
     ART. 40   YEAR 2000 WARRANTY...................................................43
     ART. 41   MISCELLANEOUS........................................................44
     ART. 42   OPTION...............................................................46


APPENDICES

         APPENDIX A -- SCOPE OF WORK
         APPENDIX B -- COMPENSATION
         APPENDIX C -- CONTRACT SCHEDULE
         APPENDIX D -- ADMINISTRATION REQUIREMENTS
         APPENDIX E -- SPECIFICATIONS
         APPENDIX F -- DRAWINGS
         APPENDIX G -- COMPANY PROVIDED FILMS
         APPENDIX H -- SUBCONTRACTORS
         APPENDIX I -- COMPANY'S INSURANCES, ETC.
         APPENDIX J -- CONTRACTOR PARENT COMPANY GUARANTEE
         APPENDIX K -- CONTRACTOR'S PROPRIETARY INFORMATION
         APPENDIX L -- INVITATION TO BID
         APPENDIX M -- AGREED UPON EXCEPTIONS AND CLARIFICATIONS
         APPENDIX N -- CONTRACTOR'S BID PROPOSAL
         APPENDIX 0 -- CONTRACTOR INSURANCE
         APPENDIX P -- COMPANY PARENT COMPANY GUARANTEE
</TABLE>


                                       ii

<PAGE>   7

DELOS OFFSHORE COMPANY, L.L.C.                  SUNDAY SILENCE FIELD DEVELOPMENT
                                                           FABRICATION AGREEMENT
================================================================================

                              FABRICATION AGREEMENT


         This Fabrication Agreement (this "Contract") effective as of July 16,
1999 (the "Effective Date") is by and between DELOS OFFSHORE COMPANY
("Company"), a Delaware limited liability company, and MODEC INTERNATIONAL LLC
("Contractor"), a Delaware limited liability company. Hereinafter, Company and
Contractor may be referred to individually as a "Party" and collectively as the
"Parties."

                                    RECITALS

         WHEREAS, Contractor is in the business to design, fabricate, assemble
and deliver facilities in accordance with Appendix A - Scope of Work ("Work");
and

         WHEREAS, Company desires and has need of the type of Work provided by
Contractor; and

         WHEREAS, Company and Contractor desire to enter into a contract whereby
Contractor shall provide such Work to Company pursuant to the terms and
conditions of this agreement and as defined in Appendix A; and

         NOW, THEREFORE, for and in consideration of the premises and the mutual
covenants and agreements contained herein and for other good and valuable
consideration the adequacy and sufficiency of which are hereby acknowledged, the
Parties hereby stipulate and agree as follows:

PART 1   GENERAL PROVISIONS


ART. 1   DEFINITIONS

         a)       Acceptance Certificate means the certificate to be issued by
                  Company in accordance with Art. 23.5.

         b)       Affiliate means, with respect to a relevant Person, any Person
                  that directly or indirectly, through one or more
                  intermediaries, controls, is controlled by or is under common
                  control with such relevant Person. For purposes of this
                  definition, the term "control" (including its derivatives and
                  similar terms) means the possession, directly or indirectly,
                  of the power to direct or cause the direction of the
                  management and policies of the relevant Person, whether
                  through the ownership or control of voting interests, by
                  contract or otherwise.

         c)       Appendices means the following appendices which are attached
                  hereto and incorporated herein for all purposes: Appendix A -
                  Scope of Work, Appendix B - Compensation, Appendix C -
                  Contract Schedule, Appendix D - Administration Requirements,
                  Appendix E - Specifications, Appendix F - Drawings, Appendix
                  G - Company Provided Items, Appendix H - Subcontractors,
                  Appendix I - Company's Insurances, etc., Appendix J -
                  Contractor Parent Company Guarantee, Appendix K - Contractor's
                  Proprietary Information, Appendix L - Invitation to Bid,
                  Appendix M - Agreed Upon

                                       1



<PAGE>   8
DELOS OFFSHORE COMPANY, L.L.C.                  SUNDAY SILENCE FIELD DEVELOPMENT
                                                           FABRICATION AGREEMENT
================================================================================

                  Exceptions and Clarifications, Appendix N - Contractor's Bid
                  Proposal, Appendix O - Contractor Insurance, and Appendix P -
                  Company Parent Company Guarantee.

         d)       Company shall have the meaning given to such term in the
                  preamble.

         e)       Company Indemnified Party means, other than any Contractor
                  Indemnified Parties, each of (i) Company and its Affiliates,
                  (ii) the contractors, subcontractors, agents, invitees and
                  other representatives of Company and its Affiliates, (iii) any
                  member, co-owner, partner, parent or other business
                  participant with the Company or any visitor of any such Person
                  and (iv) the directors, officers, employees and other
                  representatives of any such Person described in (i), (ii), and
                  (iii) above.

         f)       Company Provided Items shall have the meaning given to such
                  term in Appendix G.

         g)       Company's Representative means the Person who at any time is
                  appointed in accordance with Art. 3 to act on behalf of the
                  Company.

         h)       Completion Certificate means the certificate to be issued by
                  Company in accordance with Art. 19.

         i)       Contract means this Fabrication Agreement and Appendices as
                  stated in Art. 2, and, any amendments, supplements or
                  modifications thereto from time to time.

         j)       Contract Documents shall have the meaning given to such term
                  in Art. 2.1.

         k)       Contract Object means the item which Contractor, according to
                  the Contract, shall deliver, together with all parts thereof,
                  except for Company Provided Items before their incorporation
                  into the Contract Object.

         l)       Contract Price means the total sum payable to Contractor in
                  accordance with Appendix B, as that sum is increased or
                  decreased in accordance with the provisions of this Contract.

         m)       Contract Schedule shall have the meaning given to such term in
                  Appendix C.

         n)       Contractor shall have the meaning given to such term in the
                  preamble.

         o)       Contractor Indemnified Party means, other than any Company
                  Indemnified Parties, to the extent they are performing
                  services or delivering goods in connection with this Contract,
                  each of (i) Contractor and its Affiliates (ii) the
                  contractors, subcontractors, agents, invitees and other
                  representatives of Contractor or its Affiliates, (iii) any
                  member, co-owner, partner, parent or other business
                  participant with the Contractor or any visitor of any such
                  Person and (iv) the directors, officers, employees and other
                  representatives of any such Person described in (i), (ii), and
                  (iii) above.

         p)       Date Data shall have the meaning given to such term in
                  Art. 40.2.

         q)       Day means a consecutive calendar day unless otherwise stated.


                                       2

<PAGE>   9

DELOS OFFSHORE COMPANY, L.L.C.                  SUNDAY SILENCE FIELD DEVELOPMENT
                                                           FABRICATION AGREEMENT
================================================================================


         r)       Delivery Date means the date of delivery of the Contract
                  Object set out in Appendix C, or as varied in accordance with
                  the provisions of Art. 12 through 16.

         s)       Delivery Protocol means the document to be executed by both
                  Parties in accordance with Art. 19 upon the delivery of the
                  Contract Object.

         t)       Disputed Variation Order means a Variation Order issued in
                  accordance with Art. 16.2.

         u)       Drawings and Specifications shall have the meaning given to
                  such term in Appendix A.

         v)       Effective Date shall have the meaning given to such term in
                  the preamble.

         w)       Force Majeure means strikes, seizure, casualty loss, labor
                  disturbance, earthquakes, riots, fire, governmental action or
                  inaction, war, acts of God, named tropical storms, or any
                  other cause similar or dissimilar to the foregoing beyond the
                  reasonable control of the Party whose performance is affected
                  and which by the exercise of reasonable diligence said Party
                  is unable to prevent or provide against.

         x)       FPF Support Structure shall have the meaning given to such
                  term in Appendix A.

         y)       Framework Contract means a contract entered into by Company
                  where the obligations concerning the scope of the delivery and
                  delivery date have not been specified.

         z)       Guarantee Period means the period stated in Art. 23.2.

         aa)      Installation Agreement means that certain Installation
                  Agreement between Company and Contractor to be executed within
                  30 Days following the Effective Date, which shall relate to
                  the transportation and installation of the Contract Object.

         bb)      Materials means all items required for the Work, other than
                  Company Provided Items and working equipment.

         cc)      Party shall have the meaning given to such term in the
                  preamble.

         dd)      Parties shall have the meaning given to such term in the
                  preamble.

         ee)      Progress Milestone means the following critical timing
                  deadlines: (i) major structural steel fabrication of the FPF
                  Support Structure must begin during September 1999 and (ii)
                  the Contract Object must have fabrication completed and
                  loaded-out and ready for tow no later than March 1, 2001, such
                  exact date to be mutually agreed upon by the Parties.

         ff)      Person means any individual or entity, including, without
                  limitation, any corporation, limited liability company, joint
                  venture, joint stock company,


                                        3
<PAGE>   10

DELOS OFFSHORE COMPANY, L.L.C.                  SUNDAY SILENCE FIELD DEVELOPMENT
                                                           FABRICATION AGREEMENT
================================================================================

                  general or limited partnership, trust, agency, association,
                  organization, government authority (including any agency or
                  administrative group thereof) or other entity.

         gg)      Products shall have the meaning given to such term in Art.
                  23.6.

         hh)      Site means a place where Work is performed.

         ii)      Subcontract means an agreement entered into between Contractor
                  and a Subcontractor for the supply of goods or services in
                  connection with the Work.

         jj)      Subcontractor means a third party who has entered into an
                  agreement with Contractor for the supply of goods or services
                  in connection with the Work.

         kk)      Third Party means any party other than Company Indemnified
                  Parties and Contractor Indemnified Parties.

         ll)      Variation means a variation to the Work, Scope of Work,
                  Contract Schedule, Specifications, Drawings and Company
                  Provided Items made in accordance with the provisions of Art.
                  12 through 16.

         mm)      Variation Order shall have the meaning given to such term in
                  Appendix D.

         nn)      Work means all work which Contractor shall perform or cause to
                  be performed in accordance with the Contract, as further
                  defined by Appendix A.

         oo)      Year 2000 Compliant shall have the meaning given to such term
                  in Art 40.2.

ART. 2   CONTRACT DOCUMENTS - INTERPRETATION

2.1      The Contract Documents consist of this Fabrication Agreement and the
         following Appendices:

             Appendix A: Scope of Work
             Appendix B: Compensation
             Appendix C: Contract Schedule
             Appendix D: Administration Requirements
             Appendix E: Specifications
             Appendix F: Drawings
             Appendix G: Company Provided Items
             Appendix H: Subcontractors
             Appendix I: Company's Insurances, etc.
             Appendix J: Contractor Parent Company Guarantee
             Appendix K: Contractor's Proprietary Information
             Appendix L: Invitation to Bid
             Appendix M: Agreed Upon Exceptions and Clarifications
             Appendix N: Contractor's Bid Proposal
             Appendix O: Contractor Insurance
             Appendix P: Company Parent Company Guarantee


                                        4
<PAGE>   11
DELOS OFFSHORE COMPANY, L.L.C.                  SUNDAY SILENCE FIELD DEVELOPMENT
                                                           FABRICATION AGREEMENT
================================================================================


2.2      References made in the Contract to the expressions stated in Art. 2.1
         are references to the content of the specific Appendix referred to,
         including such variations as may have been made in accordance with the
         provisions of Art. 12 through 16.

2.3      In the event of any conflict between the provisions of the Contract
         Documents, they shall be given priority in the following order:

         a)       this Fabrication Agreement,

         b)       all Appendices, except Appendix D, in the order as
                  aforementioned in Art. 2.1,

         c)       Appendix D.

ART. 3   REPRESENTATIVES OF THE PARTIES

3.1      Prior to commencement of the Work each Party shall appoint a
         representative with authority to act on its behalf in all matters
         concerning the Contract, and appoint a deputy to act in its stead.
         Without prejudice to Art. 8.1 first paragraph, each Party may, by
         giving 14 Days notice to the other Party, substitute a representative
         or deputy.

3.2      A representative or his deputy may delegate specific tasks to one or
         more Persons appointed by him. In such case the other Party's
         representative shall be notified of the authority given to such
         appointed Person or Persons.

3.3      Contractor shall afford Company's Representative access to the Site and
         the Work during working hours. The same access shall be afforded
         Persons authorized by Company's Representatives, provided that
         notification of such authorization has been given in reasonable time.

         If, in the opinion of Contractor, the progress of the Work is impeded
         by the presence or absence of Company's Representatives or Persons
         authorized by him, Contractor shall without undue delay submit a
         request in accordance with Art. 16.1.

PART 2   PERFORMANCE OF THE WORK

ART. 4   OBLIGATIONS OF CONTRACTOR - MAIN RULES

4.1      Contractor shall perform the Work in a professional and workmanlike
         manner in accordance with the Contract. As part of such performance
         Contractor shall:

         a)       give priority to safety in order to protect life, health,
                  property and environment, and

         b)       cooperate with Company's Representative and Persons appointed
                  by him in accordance with Art. 3.


                                       5
<PAGE>   12

DELOS OFFSHORE COMPANY, L.L.C.                  SUNDAY SILENCE FIELD DEVELOPMENT
                                                           FABRICATION AGREEMENT
================================================================================


4.2      Contractor shall take care of the Contract Object, Company Provided
         Items and Materials and shall ensure in accordance with Art. 6, that
         they are kept in good order and condition. Unless specifically agreed
         to by Company, Contractor shall not have the right to make temporary
         use of Company Provided Items or Materials to be incorporated into the
         Contract Object, other than for the purpose of fulfilling the Contract.
         Company may prohibit any temporary use of Company Provided Items.

4.3      Within the framework of Appendices A, B and C, Contractor has a duty to
         cooperate with Company and other contractors and to organize its
         operations to ensure that all activities on a Site are carried out
         efficiently and without delay. However, Contractor is under no
         obligation to subordinate its execution plan to ensure overall
         efficiency unless additional costs or schedule delays, if any, are
         reimbursed by Company to Contractor.

         However, any craft, equipment or labor required to perform such work by
         Company shall be performed by Contractor or its subcontractor if
         Contractor or subcontractor has the necessary craft, equipment or labor
         available in the shipyard, fabrication yard or manufacturing plant or
         the offshore site where the work is to be performed.

         To the extent stated in Appendices A, B or C, Company is entitled to
         perform work or let other contractors perform work on the Contract
         Object. If Company desires such work to be performed which is not
         contained in Appendices A, B or C, the provisions of Art. 12 through 16
         apply accordingly.

ART.  5  AUTHORITY REQUIREMENTS - PERMITS

5.1      Contractor shall keep himself informed of and comply with:

         a)       laws and regulations which apply on the Site and at the place
                  where the Contract Object is to be used according to the
                  Contract,

         b)       requirements and orders of classification societies and public
                  authorities,

         c)       current trade union and wage agreements.

         If laws and regulations as stated in a) above have been adopted and
         requirements and orders as stated in b) above have been issued after
         the signature of the Contract and necessitate Variations to the Work or
         its execution, and this affects Contractor's costs or progress, either
         Party may request a change in the Contract Price or Contract Schedule
         reflecting the effect of such decisions or variations. Changes in the
         way in which public authorities apply such laws or regulations
         mentioned in a) above shall be dealt with in the same way. The rules in
         Art. 12 through 16 apply accordingly.

5.2      Contractor and Company shall each obtain and maintain each required
         permit or approval as defined in Appendix A, D and G. Contractor and
         Company shall, as soon as reasonably practicable following the
         Effective Date, mutually agree upon which

                                        6

<PAGE>   13

DELOS OFFSHORE COMPANY, L.L.C.                  SUNDAY SILENCE FIELD DEVELOPMENT
                                                           FABRICATION AGREEMENT
================================================================================

         permits are required, the Party responsible for obtaining each permit
         and the time period for obtaining such permits.

5.3      Company may require that Contractor submits to Company such information
         about the performance of the Work and about Contractor Indemnified
         Parties as Company is obliged to submit to public authorities.

ART. 6   DRAWING - SPECIFICATIONS - COMPANY PROVIDED ITEMS

6.1      Contractor shall make a reasonable effort to detect defects (patent
         and/or latent, discrepancies and inconsistencies ("errors") in the
         Drawings and Specifications.

         Contractor shall within seven (7) Days of detecting such defects notify
         Company of any such "errors" discovered. If Contractor does not notify
         Company of an "error" that he has discovered, and as a result, Company
         incurs direct extra costs in connection with the Work, which are not
         covered by insurance, warranties or guarantees, then all such costs
         shall be borne by Contractor. However, any and all costs or delays
         resulting from soil and environmental data and topside design details
         and all Company supplied data shall be for the account of Company.
         Contractor shall have the right to submit a request for a Variation
         Order in accordance with Art. 12 through 16 for the cost and delivery
         impact of inaccurate, incomplete, insufficient and/or incorrect Company
         supplied data.

6.2      Company will remain responsible for the correct design and fabrication
         of Company Provided Items as well as timely delivery so as to have no
         adverse effect on the Contract Schedule and/or sequencing of the Work

         Upon receipt of Company Provided Items Contractor shall make an
         immediate visual inspection and within seven (7) Days of their receipt
         give notice to Company of any "errors" discovered by such inspection.

         Within a reasonable time thereafter, and not later than the time limit
         given in Appendix G, Contractor shall carry out such examinations as
         are described in Appendix G. Contractor shall notify Company within
         seven (7) days of detecting defects of any such "errors" discovered.

         If Contractor does not notify Company of an "error" that he has
         discovered and as a result, Company incurs direct extra costs in
         connection with the Work which are not covered by insurance, or loses
         rights, warranties or guarantees, then, subject to the limitations set
         forth in Art 23, all such costs incurred shall be borne by Contractor.

6.3      Upon receipt of notice from Contractor in accordance with Art. 6.1 or
         6.2, Company shall, without undue delay, either have the necessary
         corrections made, or give Contractor instructions in accordance with
         Art. 12 through 16 as to how he shall proceed.


                                        7

<PAGE>   14

DELOS OFFSHORE COMPANY, L.L.C.                  SUNDAY SILENCE FIELD DEVELOPMENT
                                                           FABRICATION AGREEMENT
================================================================================

ART. 7   SUBCONTRACTS

7.1      Contractor shall not enter into any Subcontract concerning parts of the
         Work without the prior consent of Company, which shall not be
         unreasonably withheld. Company shall notify Contractor of its decision
         within seven (7) Days after having been asked by Contractor. However,
         such consent is not required for deliveries of work by Subcontractors
         listed in Appendix H - Subcontractors, nor for minor purchases or
         limited use of hired labor.

7.2      Contractor is responsible according to the Contract for the fulfillment
         of Subcontracts.

         If Company enters into Framework Contracts with one or more contractors
         and, subject to prior agreement with Contractor, these are assigned to
         Contractor, Company shall delay the Delivery Date if necessary due to
         the assignment to Contractor of the Framework Contracts, as agreed upon
         by the Parties, and shall bear Contractor's direct extra costs,
         provided Contractor can document that a contractor to a Framework
         Contract is unable to deliver by a deadline stated in the Framework
         Contract, or if deadlines are not stipulated in the Framework Contract,
         Contractor documents that a delivery cannot be used within the agreed
         Contract Schedule. These provisions shall, however, not apply if it can
         be shown that the delay is due to circumstances under Contractor's
         control. In other respects, the provisions in the third paragraph of
         Art. 7.2 apply to Framework Contracts assigned to Contractor after
         entry into the Contract.

         If, after entry into the Contract, Company, with prior agreement of
         Contractor, assigns a subcontract to Contractor, or appoints a
         subcontractor, and the subcontract conditions were unknown to
         Contractor at the time of entry into the Contract, then if conditions
         which were undisclosed to Contractor cause a delay in the Contract
         Schedule or result in additional costs to Contractor, then Contractor
         shall be entitled to submit a request for a Variation Order in
         accordance with Art. 12 through 16. If a subcontractor as mentioned in
         the second and third paragraphs of Article 7.2 goes into liquidation
         and the subcontract delivery in question is therefore annulled,
         Contractor is entitled to an adjustment in the Contract Schedule and
         Contract Price, pursuant to the rules in Art. 12 through 16.

7.3      Subcontractor shall state that:

         a)       the Subcontract may be assigned to Company,

         b)       Subcontractor is included in Contractor Indemnified Parties
                  with regard to the provisions of Art. 30,

         c)       Art. 22 concerning title; etc. shall apply in the relationship
                  between Contractor and the Subcontractor, and


                                        8

<PAGE>   15

DELOS OFFSHORE COMPANY, L.L.C.                  SUNDAY SILENCE FIELD DEVELOPMENT
                                                           FABRICATION AGREEMENT
================================================================================


         d)       Company shall have the rights to documents and computer
                  programs stated in Art. 32 and the rights to inventions in
                  Art. 33.

         Such Subcontracts shall also contain those provisions of the Contract
         which are necessary to enable Contractor to fulfil its obligations in
         accordance with the Contract.

         However, Company is only entitled to request copies showing provisions
         of price and payment, when Company shall compensate the Subcontract on
         a reimbursable basis.

ART. 8   LABOR FOR THE WORK

8.1      Appointment, transfer or replacement of personnel described as key
         personnel in Appendix D - Administration Requirements, shall be
         approved by Company. Approval shall not be unreasonably withheld.

         Contractor shall at its own cost replace personnel who, in Company's
         reasonable opinion, conduct themselves in an improper manner or are
         unsuitable to perform their tasks.

8.2      Contractor shall at its own cost ensure that personnel performing parts
         of the Work offshore shall have previously passed a safety course and
         medical examinations, in accordance with the existing laws and
         regulations, unless the relevant public authorities have granted a
         dispensation.

ART. 9   MINERALS MANAGEMENT SERVICE (MMS) OBLIGATIONS

9.1      This project has been approved for Royalty Relief and those obligations
         to the Minerals Management Service ("MMS") to which the Company is
         committed relative to the Sunday Silence Field Development and related
         timing (i.e., Project Schedule) and cost control are of critical
         importance to the performance of the Work. Upon Company's request,
         Contractor shall assist Company in the honoring of those commitments.
         Where Contractor's assistance results in an impact on Contractor's
         Work, Contractor shall be entitled to submit a request for a Variation
         Order pursuant to Art. 12 through 16. Contractor's sole liability for
         any loss of royalty relief which is caused by Contractor's late
         performance of the Work shall be as set forth in Art. 24 and Art. 26.

ART. 10  QUALITY ASSURANCE

10.1     Contractor shall have an implemented and documented system for quality
         assurance in accordance with the requirements stated in Appendix D -
         Administration Requirements.


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10.2     Company's Representative and personnel authorized by him shall,
         following reasonable notice, have the right to undertake quality audits
         and verification of Contractor's and any Subcontractors' quality
         assurance.

PART 3   PROGRESS OF THE WORK

ART. 11  CONTRACT SCHEDULE - DELAYED PROGRESS

11.1     Contractor shall perform the Work in accordance with Appendix C -
         Contract Schedule.

         If Contractor should have cause to believe that the Work cannot be
         carried out in accordance with the milestones set out in the Contract
         Schedule, he shall within seven (7) Days notify Company accordingly.

11.2     If in Contractor's opinion the Work cannot be performed according to
         Appendix C - Contract Schedule, owing to circumstances for which
         Company is to indemnify him, the provisions in Art. 16 shall apply
         accordingly. A request for a Variation Order must be presented before
         the expiration of the time limits set forth in Art. 27.1 and 28.2,
         respectively.

11.3     If in Contractor's opinion the Work cannot be performed according to
         Appendix C - Contract Schedule, for reasons for which Contractor is
         responsible, he shall within seven (7) Days after notification
         according to Art. 11.1 communicate:

         a)       the cause of the delay,

         b)       its estimated effect on the Contract Schedule and other parts
                  of the Work, and

         c)       the measures which Contractor considers appropriate to avoid,
                  recover or limit the delay.

         Company shall within seven (7) Days notify Contractor of its view of
         the information provided by Contractor in accordance with Art. 11.3 a),
         b) and c). Such notification shall not release Contractor from any of
         its obligations under Art. 11.1, Art. 24 or any other provisions of
         this Contract.

         If the measures proposed or implemented by Contractor are insufficient
         to avoid or recover the delay, then Company may require Contractor to
         take measures considered necessary. If Contractor maintains that it has
         no obligation to implement the measures required by Company, the
         variation provisions provided in Art. 12 through 16 shall apply,
         accordingly.

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PART 4   VARIATIONS AND CANCELLATION

ART. 12  RIGHT TO VARY THE WORK

12.1     Company has the right to order such Variations to the Work as in
         Company's opinion are desirable.

         Variations may include an increase or decrease in the quantity,
         character, quality, kind or execution of the Work or any part thereof,
         as well as changes to the Contract Schedule.

         Nevertheless, Company has no right to order Variation work which
         cumulatively exceeds that which the Parties could reasonably have
         expected when the Contract was entered into.

12.2     When Company orders a Variation to the Work to be performed, Contractor
         shall submit within seven (7) Days an estimate to Company, unless the
         Parties agree that it is unnecessary. Company may require the
         submission of such estimate prior to ordering Variation work to be
         performed. The estimate shall contain:

         a)       a description of the Variation work in question,

         b)       a detailed schedule for the execution of the Variation work
                  showing the required resources and significant milestones.

         c)       the effect on the Contract Price, showing the rates used when
                  preparing the estimate, and

         d)       the effect on the Contract Schedule, with documentation
                  demonstrating such effect.

         Company shall pay Contractor's necessary and documented costs for
         preparing the estimates required by Company. The provisions of Art. 12
         through 15 shall apply, accordingly.

12.3     Contractor may propose a Variation to the Work in accordance with
         Art. 12.

         According to the provisions in Art. 3.3, 4.3, 5.1, 6.1, 6.3, 7.2, 11.2,
         18.3, 27.1 and 28.2 and any other applicable Articles, Contractor has
         the right to request variation in the Contract Price and/or the
         Contract Schedule.

ART. 13  EFFECTS OF A VARIATION TO THE WORK

13.1     All Contractor's obligations under the Contract also apply to
         Variations to the Work, unless otherwise agreed.

13.2     Unless otherwise agreed between the Parties, the price for Variations
         to the Work shall be determined according to the provisions set forth
         in Appendix B.


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13.3     If the net effect of all Variations to the Work is such that the
         Contract Price becomes less than the original Contract Price, then
         Company shall increase the Contract Price by six percent (6%) of the
         difference.

13.4     The effects of Variation work on the Contract Schedule shall be agreed
         upon in the particular Variation Order for such work, on the basis of
         the accumulated net effect of a variation.

         Subject to the limitations which follow from Art. 12.1, Company may
         require Contractor to undertake special measures to avoid Variation
         work having an effect on the Contract Schedule, or to limit delays as
         much as possible. The provisions in Art. 12 through 16 shall apply,
         accordingly.

13.5     A Variation to the Work caused by Contractor's defective performance of
         the Work and/or Contractor's delay in the Contract Schedule shall not
         entail any variations to the Contract Price or the Contract Schedule in
         favor of Contractor.

ART. 14  ISSUE OF VARIATION ORDERS

14.1     All Variations to the Work required in accordance with the provisions
         of Art. 12 and 13 shall be made by means of a Variation Order issued by
         Company in accordance with the provisions of this Article and
         Appendix D.

         Company may also order Variations to the Work by means of a "drawing
         revision." In the context of Art. 14, 15 and 16, "drawing revision"
         means any change to Drawings or Specifications where the change is
         clearly identified and has been submitted to Contractor in accordance
         with such special procedures as are set forth in Appendix D -
         Administration Requirements.

14.2     A Variation Order shall be expressly identified as such and be issued
         on a prescribed form. It shall contain a complete description of the
         Variation work and the schedule for its execution, together with the
         effects on the Contract Price and the Contract Schedule, so far as
         practicable, and the effects, if any, on the provisions of the
         Contract. Such effects as are not recorded on the original Variation
         Order shall be recorded in an addendum to it.

ART. 15  CONSEQUENCES OF VARIATION ORDERS - DISPUTES ABOUT CONSEQUENCES

15.1     On receipt of a Variation Order or a "drawing revision" as described in
         Art. 14.1, Contractor shall implement it without undue delay, even if
         the effect of the Variation Order or "drawing revision" on the
         Contract Price, the Contract Schedule and other provisions of the
         Contract has not yet been agreed.

15.2     If the Parties agree that there is a Variation, but disagree as to the
         Variation's effect on the Contract Price, then Company shall pay
         Contractor provisional compensation


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         calculated in accordance with Appendix B. Payment shall be made in
         accordance with the provisions of Art. 20. The undisputed amount shall
         be due for payment 30 Days after Company receives the invoice.

         Compensation paid for the Variation work for which there is a dispute
         as to the Variation's effect on the Contract Price shall be considered
         final unless, within six (6) months of the issue of the Variation Order
         by Company, Contractor has begun dispute resolution proceedings as
         provided for in Art. 37.2 or Company and Contractor agree on an
         alternate sum to provisional compensation paid by Company pursuant to
         Art. 15.2.

         If a price for the Variation work is decided other than the
         compensation paid in accordance with the first paragraph of this Art.
         15.2, interest shall be paid on the difference between the compensation
         paid and the final price and shall accrue at the rate of 10% per annum.

         If Contractor has presented a request for a Variation Order which
         satisfies the conditions in the third paragraph of Art. 16.1, interest
         shall begin to be charged from the date when the work would have been
         paid for if it had been part of the Work, but no earlier than 30 Days
         after the presentation of the request for the Variation Order. Interest
         shall similarly accrue on amounts that are not disputed between the
         Parties. If Company issues a Variation Order without any previous
         request having been presented for the Variation work, interest shall
         begin to accrue from the due date according to the first paragraph.

15.3     If the Parties disagree as to the effect that a Variation Order will
         have on the Contract Schedule, then the views of both Parties shall be
         recorded on the Variation Order.

         If Company requires implementation of the measures stated in Art. 13.4,
         to avoid or limit the delay which, in the opinion of Contractor, will
         result from a variation to the Contract Schedule, then the provisions
         of Art. 15.2 shall apply accordingly. Company shall in such case
         require such measures to be taken in accordance with the provisions of
         Art. 16 regarding disputed variations.

15.4     Neither Company's payment nor Contractor's implementation of a
         Variation Order or a "drawing revision" shall affect the Parties'
         possible claims for variations to the Contract Price or the Contract
         Schedule.

ART. 16  DISPUTE AS TO WHETHER A VARIATION TO THE WORK EXISTS -
         DISPUTED VARIATION ORDER

16.1     If Company requests performance of specific work which in Contractor's
         opinion is not part of its obligations under the Contract, then
         Contractor shall request Company to issue a Variation Order and
         shall, within seven (7) Days, prepare an estimate in accordance with
         Art. 12.2. In the case of a "drawing revision" as described in


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         Art. 14.1, this Art. 16.1 shall apply only if Contractor requests a
         variation in the Contract Price or Contract Schedule as a result of the
         revision.

         If Contractor has not presented a request for a Variation Order within
         seven (7) Days after Company has requested the work to be performed,
         then Contractor loses the right to consider the work as Variation work
         in accordance with Art. 12.

         A request for a Variation Order shall be presented by means of a
         prescribed form known as a Variation Order request, such form which is
         in Appendix D. It shall contain a specified description of the work the
         request relates to and the effects which in Contractor's opinion it
         will have on the Contract Schedule and the Contract Price.

         If Contractor presents a request which, in substance; is a request for
         a Variation Order without using the above mentioned form, Company is
         entitled to treat the request as a request for a Variation Order. In
         that case, Contractor shall be informed in writing within seven (7)
         Days.

16.2     When Contractor has made a request within the time limit specified in
         Art. 16.1 and Company agrees with such request, Company shall, within
         fourteen (14) Days, issue a Variation Order in accordance with the
         provisions of Art. 14. If Company is of the opinion that the work
         referenced in Contractor's request for a Variation Order is a part of
         the Work, it shall be expressly recorded that the Variation Order is
         disputed ("Disputed Variation Order"). A Disputed Variation Order shall
         be expressly identified as such and shall be issued on a special form,
         which shall identify the work in dispute between the Parties and state
         Company's reason for regarding the Variation Order as disputed. Upon
         receiving a Disputed Variation Order, Contractor shall implement it
         within seven (7) Days.

16.3     If Contractor is of the opinion that it is entitled to a Variation to
         the Work because of delay, or actions by Company or extra measures, or
         other changes resulting from breach of Contract by Company, or from
         Force Majeure, the provisions of this Art. 16 shall apply accordingly.
         A request for a Variation Order must be made before the expiration of
         the time limits stated in Art. 27.1 and Art. 28.2, respectively.

ART. 17  CANCELLATION

17.1     Company may by written notice to Contractor cancel the Contract with
         the consequence that the performance of the Work ceases.

17.2     Following such cancellation, Company shall pay:

         a)       the unpaid balance due to Contractor for that part of the Work
                  already performed.

         b)       all costs incurred by Contractor and its Subcontractors in
                  connection with Materials and Services ordered prior to
                  receipt of the notice of cancellation by Contractor, and
                  compensation for work performed on such Materials prior to


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                  the said date, provided that such costs are not covered by
                  payment under Art. 17.2 a).

         c)       all necessary cancellation charges and administration costs
                  incurred by Contractor in connection with the cancellation,

         d)       Contractor's and Subcontractors' other expenses directly
                  attributable to an orderly closeout of the Contract,
                  calculated as far as possible in accordance with the
                  provisions of Art. 13.2.

         Payment shall be made in accordance with the provisions of Art. 20.

17.3     In addition to the amounts stated in Art. 17.2, Company shall pay,
         within 30 Days after receiving an invoice, a cancellation fee equal to
         the lesser of:

         a)       2% of the Contract Price, or

         b)       4% of the part of the Contract Price which is not paid at the
                  date of cancellation and which shall not be paid pursuant to
                  Art. 17.2 a).

         Company shall only be entitled to deduct from the cancellation fee such
         claims as have been presented to Contractor prior to the date of
         cancellation and have been accepted by Contractor.

17.4     Contractor shall, in accordance with Company's instructions, make its
         best efforts to cancel Subcontracts on terms acceptable to Company. If
         Company cannot accept the cancellation terms, then Contractor shall
         assign such Subcontracts to Company.

         If Company cancels the Contract, all of Contractor warranty obligations
         on the Work not yet performed will cease and Contractor's Performance
         Guarantee shall be rendered null and void as to such uncompleted Work
         on the date of such cancellation, and such Performance Guarantee shall
         be returned to Contractor within 30 Days of such cancellation. However,
         all of Contractor warranty obligations and Contractor's Performance
         Guarantee as to all Work completed prior to the cancellation by Company
         shall remain in full force and effect subsequent to any such
         cancellation.

17.5     The Parties shall execute a Delivery Protocol stating each Party's view
         of the percentage of the Contract Object and the Work delivered and
         completed, calculated in accordance with the principles of progress
         measurement stated in the Contract. Company shall also issue a
         Completion Certificate which reflects the Delivery Protocol. The
         provisions of Art. 19 shall apply accordingly.

         Contractor shall deliver copies of all plans, drawings, specifications
         and other documents which Company is entitled to use in accordance with
         Art. 32 and 33.

17.6     Company shall, at its own cost, remove the Contract Object, Materials
         and Company Provided Items from Contractor's Site.


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         If such removal is not done within 60 Days, then Contractor may, having
         first given notice to Company, remove them to a suitable location for
         storage at Company's cost and risk. Contractor shall, until the
         Contract Object, Materials and Company Provided Items have been
         removed, keep them in a safe manner at Company's cost and risk.

ART. 18  COMPANY'S RIGHT TEMPORARILY TO SUSPEND THE WORK

18.1     Company may temporarily suspend the performance of the Work, by giving
         notice to Contractor.

         The notice shall specify which part of the Work shall be suspended, the
         effective date of the suspension and the expected date for resumption
         of the Work. Furthermore, it shall state the mobilization plan and any
         support functions which shall be maintained while the Work is
         suspended.

         Contractor shall resume the Work after notification by Company. The
         date of resumption of the Work shall be determined with due
         consideration of the mobilization plan, and the support functions that
         have been maintained during the suspension.

18.2     Company shall compensate Contractor for all necessary expenses arising
         from:

         a)       demobilization of personnel and equipment,

         b)       safeguarding the Contract Object, Company Provided Items and
                  related Materials and equipment,

         c)       personnel, Subcontractors and equipment which must be kept
                  available in accordance with the mobilization plan,

         d)       moving the Contract Object, if necessary, so that it does not
                  interfere unreasonably with Contractor's other activities, and

         e)       other expenses incurred by Contractor as a result of
                  suspension of the Work.

         Contractor's claim for work performed shall be calculated in accordance
         with Art. 13.2.

18.3     If suspension of the Work affects the Contract Schedule or if
         Contractor claims that it does, then the provisions of Art. 12 through
         16 concerning variations to the Contract Schedule and the Contract
         Price shall apply accordingly.

PART 5   DELIVERY AND PAYMENT

ART. 19  DELIVERY AND COMPLETION OF THE WORK

19.1     The Delivery Date and delivery of the Contract Object shall occur when
         (i) the Parties jointly, upon Contractor's request, execute a Delivery
         Protocol in a form substantially

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         similar to that set forth in Appendix D, (ii) the Contract Object has
         been completed in all material respects and has passed the tests
         specified in the Contract, and (iii) the Contract Object is ready for
         tow.

         The Delivery Protocol shall be executed even if minor parts of the Work
         remain incomplete, provided that such remaining parts do not have
         practical significance for the use of the Contract Object, or for later
         construction work to be performed by other contractors.

19.2     The Delivery Protocol shall be executed when the conditions set forth
         in Art. 19.1 have been met, provided that Contractor has requested the
         execution of such Delivery Protocol no earlier than 30 Days before and
         no later than two (2) Days before the proposed date of execution of
         such Delivery Protocol.

         The Delivery Protocol shall contain a thorough list of any outstanding
         items of the Work, and information regarding when such items shall be
         complete. When the Parties disagree, both views shall be recorded in
         the Delivery Protocol.

         The Delivery Protocol shall be dated and signed by both Parties.

19.3     Company shall issue the Completion Certificate for the Work, as defined
         by Appendix A, Scope of Work, on the date the Delivery Protocol is
         executed. The issuance by the Company of the Completion Certificate
         shall be expressly conditioned upon the satisfactory completion by the
         Contractor of the outstanding Work items as outlined in the Delivery
         Protocol. Further, the issuance of the Completion Certificate shall in
         no way relieve or release Contractor from its obligations to perform
         guarantee Work and/or Work yet to be completed under the terms of this
         Contract.

19.4     If the Contract requires parts of the Contract Object to be delivered
         progressively, then the provisions of Art. 19.1, 19.2 and 23 apply
         accordingly to deliveries of such parts; provided, however, that
         progressive delivery of parts of the Contract Object shall not act to
         extend the Guarantee Period set forth in Art. 23.2 and 23.3.

ART. 20  PAYMENT OF THE CONTRACT PRICE, INVOICING AND AUDIT

20.1     Company shall pay the Contract Price to Contractor within the time
         limits and in accordance with the provisions stated in this Article and
         elsewhere in the Contract. Company has no obligation to pay until
         Contractor has submitted a guarantee in accordance with Art. 21.

         The Parties agree that, consistent with the agreed upon payment
         schedule and without reducing Company's duty to pay Contractor for all
         Work performed by Contractor, Company shall not be required to pay more
         than US$8 million in 1999 for the Work under this Contract, with the
         remainder of the amounts otherwise due to Contractor


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         for 1999 to be invoiced on or before January 1, 2000 and payable
         thereafter within 30 Days in accordance with Art. 20.3.

20.2     Unless otherwise prescribed in Appendix B - Compensation, the
         following provisions shall apply to invoicing:

         a)       The cut-off date for data-collection and invoicing for the
                  Work is the last Sunday in each calendar month.

         b)       Within ten (10) Days of a cut-off date, Contractor shall
                  submit to Company an invoice for the part of the Contract
                  Price payable in respect of Work performed up to that cut-off
                  date.

         c)       The invoice shall be prepared in accordance with the
                  provisions of Appendix B - Compensation, and Art. 12 through
                  16. Documentation necessary for control of the invoiced amount
                  shall be appended.

20.3     Company shall, within 30 Days after receipt of an invoice which
         satisfies the requirements in Art. 20.2, pay the undisputed amount due
         to Contractor according to the invoice. Unless otherwise provided for
         in the Contract, the following deductions may be made from the payment:

         a)       any previous payments on account to Contractor which relate
                  to, or directly concern, the work covered by the invoice,

         b)       such parts of the invoiced amount as are insufficiently
                  documented or otherwise disputed, provided Company, within ten
                  (10) Days following receipt, specifies what documentation is
                  considered insufficient and/or what the dispute concerns,

         c)       all amounts due to Company from Contractor, provided that
                  Company is entitled to make such deductions in accordance with
                  the Contract.

20.4     Within 90 Days after issue of the Completion Certificate, Contractor
         shall submit its proposal for the final account. The proposal shall
         contain a breakdown of the total compensation for the Work, including
         all claims to be made by Contractor, less any amounts due to Company.
         The proposal shall contain documentation relating to each item included
         in the breakdown.

         Claims not included in the proposed final account cannot be submitted
         later by Contractor. This does not apply to compensation for Work
         performed after issue of the Completion Certificate.

         Within 90 Days of receiving the proposed final account, Company must
         notify Contractor of any objections to the proposal. Company must state
         the grounds for its objections. If Company does not object within the
         time limit, Contractor's proposal shall be regarded as accepted.



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20.5     Company is entitled to audit at Contractor's and its Subcontractor's
         premises all payments for reimbursable work to Contractor and its
         Subcontractors. Company's right to audit does not apply to a
         Subcontractor where the Subcontract entails minor purchases and limited
         use of hired labor.

         Contractor may require the audit to be performed by a neutral auditor
         where he can show that there is a possibility of confidential
         information, or information which is not relevant for the purposes of
         the audit, being disclosed to the wrong parties.

         Company is entitled to audit during the period of Contract and for up
         to 2 years after the end of the year of issue of the Completion
         Certificate.

         Payment shall not affect Company's audit rights. If charges are proven
         incorrect, then a new account shall be prepared, whether or not this
         is in the favor of Contractor.

ART. 21 GUARANTEE

21.1     As soon as reasonably practicable following the Effective Date but in
         no event longer than 14 regular business days, Contractor shall cause
         Modec, Inc. and FMC Corp. to execute a guarantee of Contractor's
         obligations under the Contract, such guarantee to include material
         terms which are substantially similar to the material terms set forth
         in Appendix J - Contractor Parent Company Guarantee. Further,
         Contractor represents and warrants that Modec Inc. and FMC Corp. have
         agreed to and will execute such guarantee.

21.2     As soon as reasonably practicable following the Effective Date but in
         no event longer than 14 regular business days, Company shall cause
         Leviathan Gas Pipeline Partners L.P. to execute a guarantee of
         Company's obligations under the Contract, such guarantee to include
         material terms which are substantially similar to the material terms
         set forth in Appendix P - Company Parent Company Guarantee. Further,
         Company represents and warrants that Leviathan Gas Pipeline Partners
         L.P. have agreed to and will execute such guarantee.

21.3     The guarantees referenced in Art. 21.1 and 21.2 above shall be valid
         until the end of the Guarantee Period.

ART. 22  TITLE TO THE CONTRACT OBJECT-RIGHT TO DEMAND DELIVERY

22.1     Title to the Contract Object shall pass to Company progressively as the
         Work is performed and Contractor is compensated accordingly. Title to
         Materials passes to Company when Contractor is paid for such Materials
         by Company.

         As soon as Materials and Company Provided Items arrive at a Site,
         Contractor shall mark them with an identification number and Company's
         name, and as far as possible, shall keep them separate from other
         items.



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22.2     During the performance of the Work and on delivery and only with
         respect to payments which have been made by Company, Contractor agrees
         that the Contract Object, Materials and all other items owned by
         Company shall be free and clear of all liens, attachments, encumbrances
         and rights whatsoever, incurred prior to or concurrently with the
         performance and delivery of the Work to Company, other than those for
         which Company is responsible. Further, and subject to the restrictions
         in the preceding sentence, CONTRACTOR SHALL DEFEND, INDEMNIFY AND SAVE
         COMPANY HARMLESS FROM AND AGAINST ANY AND ALL LOSSES RESULTING DIRECTLY
         OR INDIRECTLY FROM SUCH LIENS AND/OR SIMILAR LEGAL PROCESS AND/OR
         ATTACHMENTS.

22.3     Subject to Art. 22.1, Company shall have the right to register its
         title to the Contract Object, Company Provided Items, Materials and
         the Contract. Contractor shall, at Company's cost and without undue
         delay, execute and deliver to Company such documents, and take such
         actions as Company requires to effect such registration, including
         ensuring, that title to deliveries by Subcontractors be so registered,
         if Company cannot do so itself.

22.4     If Contractor claims, based on nonpayment by Company of disputed
         amounts under the Contract, that Contractor is entitled to refuse to
         deliver the Contract Object, Materials, or other items to which Company
         claims it is entitled under the Contract, then Company may in all cases
         demand delivery and delivery shall be immediate in return for:

         a)       payment of the outstanding amount due to Contractor under the
                  Contract, insofar as the amount is not in dispute, and

         b)       a guarantee issued by Company for any further amounts which
                  Contractor maintains are due under the Contract, but which
                  Company considers it has no obligation to pay.

ART. 23  CONTRACTOR GUARANTEE - ACCEPTANCE CERTIFICATE

23.1     With the execution of consumable items and excepting normal wear and
         tear, Contractor guarantees and warrants the performance of the Work.
         Contractor also guarantees and warrants that Materials delivered by it
         for incorporation into the Contract Object are new, and that any
         engineering performed by Contractor will be in accordance with the
         Drawings and Specifications and industry standards for the oil and gas
         industry. Contractor guarantees and warrants that all of its equipment
         is in good working order and condition, that all of Contractor's
         personnel are trained and capable of operating and shall operate such
         equipment and perform the Work in a safe and workmanlike manner.

         Contractor hereby warrants and guarantees the Work to the extent that
         Contractor will repair or replace at Contractor's own expense, any
         defects in such workmanship. Contractor also guarantees and warrants
         that the Contract Object will conform during



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         the Guarantee Period to the Drawings and Specifications which are valid
         at the time of delivery (final documentation). This guarantee does not
         apply to Company Provided Items unless required by Art. 6.1 and 6.2.

         Contractor's liability for defects covered by the guarantee shall be
         determined in. accordance with the provisions of Art. 25.

23.2     The Guarantee Period begins on the date of signing of the Delivery
         Protocol. It expires, unless otherwise extended pursuant to Art. 23.3,
         on the first occurring of the following times:

         a)       15 months from the signing of the Delivery Protocol, or

         b)       15 months from the date Company has taken over the Contract
                  Object in accordance with the Contract, where the conditions
                  for signing the Delivery Protocol in accordance with Art. 19.1
                  have not been fulfilled.

         Notwithstanding the foregoing, Contractor shall provide an extended
         limited warranty for the FMC Spring Tensioners recommended for use by
         Contractor for the duration of the first installation or ten (10)
         years, whichever comes first. The warranty will cover design,
         workmanship and materials used in the Spring Tensioner. This warranty
         includes an annual inspection by the manufacturer's technician,
         replacement of all parts integral to the tensioner and all required
         maintenance. Additionally, if Company determines through the
         operational performance of the Spring Tensioners that the system does
         not functionally satisfy the design expectations and preinstallation
         test results, then subject to Art. 25.4, Contractor shall, at its
         option and its own cost, either repair the existing system back to a
         fully functional system, or remove and replace the entire system, at no
         cost to Company, with an alternate system that meets the operational
         requirements. Company shall have the opportunity to review and approve
         the installation and/or repair procedures, such approval which shall
         not be unreasonably withheld.

23.3     In case Contractor performs guarantee work during the Guarantee Period,
         he guarantees those parts of the Work affected by the guarantee work.
         This guarantee applies for 15 months after the date of completion of
         the guarantee work. The length of the guarantee for such parts of the
         Work shall, however, under no circumstances extend beyond 24 months
         after completion of the first guarantee work.

23.4     Contractor shall, to the maximum extent reasonably possible, obtain
         guarantees and warranties from its subcontractors, vendors and
         suppliers regarding all material manufactured and/or supplied by those
         parties and incorporated into, attached to, or in anyway affixed to or
         used in connection with the Work and the components of that material
         that (i) provide the same coverage as the guarantees and warranties
         given by Contractor in this Art. 23, (ii) are freely assignable to, or
         directly enforceable by, Company, and (iii) provide for prompt
         recovery, repairs, or replacement and



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         installation services for non-compliant items. Contractor shall assign
         such guarantees and warranties to Company and shall assist and
         cooperate fully with Company in seeking remedies thereunder, except
         that no provision of this Art. 23 shall obligate Contractor to join
         Company in litigation to enforce Company's or Contractor's rights under
         said supplier warranties. Assignment of any warranties and guarantees
         pursuant to this Art. 23.4 shall not limit, alter or waive any rights
         of Company under this Contract or otherwise modify the obligations of
         Contractor under this Contract.

         Company shall be entitled to enforce the guarantees given by
         Subcontractors, where such guarantees are more beneficial to Company
         than Contractor's guarantee pursuant to this Article.

23.5     Company shall issue the Acceptance Certificate when all the Work, as
         defined by Appendix A - Scope of Work to this Contract and Appendix A -
         Scope of Work to the Installation Agreement, has been completed.
         Issuance of the Acceptance Certificate does not in any way relieve or
         release Contractor from obligations to perform guarantee work during
         the Guarantee Period pursuant to Art. 23.2.

23.6     Contractor hereby represents and warrants that all applicable
         materials, supplies and products, including but not limited to,
         equipment, software, hardware, microprocessing chips, other data
         processing devices and services, and parts and components thereof
         (collectively the "Products"), supplied or furnished by Contractor are
         and will be Year 2000 Compliant.

         This representation and warranty shall survive until the earlier of 24
         months or upon termination of this Contract. In the event that such
         warranty compliance requires the acquisition of additional Products,
         the expense for any such associated or additional acquisitions which
         may be required (including, without limitation, data conversion tools)
         shall be borne exclusively by Contractor.

23.7     The remedies provided in this Contract between Company and Contractor
         shall be exclusive and in lieu of any other remedies with respect to
         the subject matter available to the parties, and ANY IMPLIED WARRANTIES
         OF FITNESS FOR PURPOSE, MERCHANTABILITY AND OTHER IMPLIED OR STATUTORY
         REMEDIES (EXCLUDING WARRANTIES OF TITLE) WHICH ARE INCONSISTENT WITH
         THIS CONTRACT ARE EXPRESSLY WAIVED BY COMPANY. Contractor makes no
         other warranties, either express or implied thereof, except as
         expressly set forth in this Contract.

PART 6   BREACH OF CONTRACT

ART. 24 CONTRACTOR'S DELAY

24.1     Save what is stated in Art. 11 concerning delayed progress, delay
         occurs when Work prescribed in the Contract Schedule has not been
         completed in accordance with the Contract.



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24.2     If:  (a) a claim, demand or lawsuit is instituted by any Third Party
                  against Company or Contractor based upon the design or
                  specifications of the Contract Object, Materials or similar
                  claims, and such claim, demand or lawsuit results in any
                  deadline in the Progress Milestones or the Delivery Date as
                  set forth on the Contract Schedule being missed, or

              (b) the Work is delayed for reasons within Contractor's or
                  Contractor Indemnified Parties' control causing any deadline
                  in the Progress Milestones or the Delivery Date as set forth
                  on the Contract Schedule to be missed,

         then a default by Contractor shall be deemed to have occurred, and the
         following shall apply accordingly:

                     (i)   in the event the September 30, 1999 Progress
                           Milestone is missed, Contractor shall pay daily
                           liquidated damages in the amount of 0.20% of the
                           Contract Price per Day until the earlier of the Day
                           the Work which should have been completed on or
                           before such Progress Milestone is completed or until
                           the maximum cumulative liability for liquidated
                           damages has been paid in accordance with Art. 24.4;

                     (ii)  in the event the March 1, 2001 Progress Milestone is
                           missed, Contractor shall pay daily liquidated damages
                           in the amount of 0.10% of the Contract Price per Day
                           until the earlier of the Day the Work which should
                           have been completed on or before such Progress
                           Milestone is completed or until the maximum
                           cumulative liability for liquidated damages has been
                           paid in accordance with Art. 24.4.

24.3     If a default as described in Art. 24.2 has occurred and Company is
         subjected to a loss in whole or in part of royalty relief for the
         Sunday Silence project due to such breach, then within seven (7) Days
         of losing such royalty relief, Company shall elect to either: (1) waive
         any further payment of the liquidated damages imposed by Art. 24.2
         against Contractor and continue to operate under the terms of the
         Contract, (ii) terminate the Contract without further assessment of
         damages, pay for and take immediate possession of any and all
         Materials, and pay Contractor for the Work completed prior to the time
         of the termination, or (iii) suspend Work pursuant to Art. 18.1 and
         18.2, during which time no liquidated damages will be assessed against
         Contractor.

         Further, if (a) a default has occurred pursuant to Art. 24.2(i), (b)
         Company has not lost the royalty relief in whole or in part for the
         Sunday Silence project, and (c) Company has not elected to terminate
         the Contract pursuant to Art. 24.3(ii), then if Contractor meets the
         March 1, 2001 Progress Milestone, an amount equal to the amount of
         liquidated damages previously paid by Contractor in accordance with



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         Art. 24.2(i) shall be reimbursed by Company to Contractor upon the
         completion of the Work and Company waives any night to assess any
         liquidated damages against Contractor under Art. 24.2(i).

24.4     Notwithstanding the above, Contractor's cumulative liability for
         liquidated damages under Art. 24.2 is limited to 10% of the Contract
         Price. The assessment of liquidated damages and the right to terminate
         as described in Art. 24 and 26 shall be Company's sole and exclusive
         remedy for late completion.

         Accrued liquidated damages and the reimbursement of liquidated damages
         shall be settled in connection with the final account, in accordance
         with Art. 20.4.

24.5     Upon Contractor's reasonable request, Company shall be obligated to
         provide Contractor with verbal updates as to Company's communications
         and negotiations with the MMS regarding the royalty relief referenced
         in Art. 24.3. Additionally, Contractor may assist Company in such
         negotiations with the MMS.

24.6     In addition to the provisions of Art. 24.3, Company may terminate the
         Contract in accordance with Art. 26 due to delay. The provisions stated
         in Art. 11, Art. 24 and Art. 26 are Company's sole remedies against
         Contractor's delay.

ART. 25  CONTRACTOR'S DEFECTS AND GUARANTEE LIABILITY

25.1     If the Contract Object has a defect when delivered to Company, whether
         stated in the Delivery Protocol or not, or if a defect arises for which
         Contractor is liable under its guarantee in accordance with Art. 23,
         then Contractor is responsible for the defect in accordance with the
         provisions of this Article.

         Notwithstanding the foregoing paragraph, Contractor is, however, liable
         for a defect only if Company has given notice of the defect, within 14
         Days after having discovered the defect. Such notice must, in any case,
         have been given at the latest before the expiration of the Guarantee
         Period. If the notice concerns defects in guarantee work, then it must
         have been given before the expiration of the period set forth in Art.
         23.3. All notices to Contractor under this Article shall be in writing.

         The notice to Contractor shall contain a specific description of the
         defect.

25.2     When Contractor is responsible for a defect, it shall, at its own cost
         and within six (6) Days, rectify it, commence rectification, or submit
         a rectification plan to Company for Company's review and comment.

         Contractor shall notify Company of which measures it intends to apply
         and the time schedule for rectification. Company shall notify
         Contractor of its views on the rectification plans without undue delay.
         Company shall not unreasonably prevent Contractor from performing the
         planned rectification.



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25.3     If Contractor is unable to rectify a defect within the time schedule as
         originally agreed upon by the parties pursuant to Art. 25.2, then
         Company shall be entitled to rectify the defect itself or to engage a
         Third Party to do so. In such case, Contractor shall pay the necessary
         costs of rectification, provided Company acts in a reasonable manner.
         However, in no case shall the amount Contractor is obligated to pay be
         more than the sum of Contractor's good faith estimated amount it would
         have cost Contractor to rectify the defect plus 15%.

         If in accordance with this Art. 25.3, the rectification work is
         performed by parties other than Contractor or if the work is left
         undone, Contractor shall not be obligated to guarantee such
         rectification work.

25.4     Contractor's liability for rectification work and for costs under Art.
         25.3 is limited to 15% of the Contract Price, above which amount
         Company agrees to release and hold harmless Contractor.

         Contractor is under no circumstances liable for costs relating to:

         a) dismantling of other objects than the Contract Object to provide
            access to the Contract Object,

         b) board and lodging offshore,

         c) transport to, from and at the offshore location,

         d) heavy lift operations offshore,

         e) extra costs associated with guarantee work performed below the water
            line.

ART. 26  TERMINATION DUE TO CONTRACTOR'S BREACH OF CONTRACT

26.1     Company is entitled to terminate the Contract with immediate effect by
         notifying Contractor when:

         a)       Company has become entitled to be paid maximum liquidated
                  damages in accordance with Art. Art. 24.2, or

         b)       Contractor is in material breach of a material provision of
                  the Contract and has not agreed to implement reasonable
                  actions to cure the breach within 14 Days, or

         c)       Contractor becomes insolvent or stops its payments, or

         d)       a default by Contractor pursuant to Art. 24.3 has occurred,
                  subject to the limitations set forth in Art. 24.3.



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26.2     Upon termination of the Contract, Company is entitled to take over from
         Contractor the Contract Object, Materials, Company Provided Items,
         Subcontracts, documents and other rights necessary to enable Company to
         complete the Contract Object, either by itself or with the help of
         others.

         Company is entitled either by itself or with the assistance of any
         Third Party, to use Contractor's Site, equipment, tools, drawings, etc.
         as necessary to complete the Contract Object, provided such use is
         compensated for and is of a limited duration, and provided further that
         business secrets, know-how and other information which Company or such
         Third Party acquire shall be used only for completion of the Contract
         Object. The use of any Subcontractor site shall first require the
         consent of said Subcontractor.

         Contractor is entitled to be paid for Work actually performed and for
         plant and equipment taken over by Company in accordance with the first
         paragraph of this Art. 26.2, less any amounts due from Contractor to
         Company.

26.3     When the Contract is terminated, Company shall also be entitled to
         enforce one or more of the following claims:

         a)       Company may claim damages for delay in the form of liquidated
                  damages in accordance with the provisions of Art. 24.2; and

         b)       Company may claim damages for defects and other breaches of
                  Contract, subject to the limitations set forth in Art. 25.4.

         Notwithstanding anything to the contrary contained in this Contract,
         Contractor's total liability (under this Art. 26.3, Art. 24, Art. 25
         and the responsibility for carrying out measures requested under Art.
         11.4) shall in no circumstances exceed 25% of the Contract Price.
         Notwithstanding any other provision of this Contract to the contrary,
         such limitation of liability shall encompass all liabilities under such
         Articles, whether under contract at law, in equity or in admiralty.

26.4     In all cases where Company takes over the Work from Contractor,
         Contractor cannot guarantee proper completion and/or quality of the
         Work, and, therefore Contractor's warranty obligations cease with
         respect to any Work not completed at the point Company takes over the
         Work.

ART. 27  COMPANY'S BREACH OF CONTRACT

27.1     If Company is late in delivering Company Provided Items, Drawings,
         Specifications or access to installation site, or is in breach of any
         other material obligations under the Contract, then Contractor may be
         entitled to an adjustment of the Contract Schedule and/or the Contract
         Price in accordance with the provisions of Art. 12 through 16, as
         applicable. Such adjustment shall reflect the actual costs of the delay
         caused to Contractor by Company's breach of Contract.



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         Contractor has a corresponding right with respect to delay caused by
         defects, discrepancies and inconsistencies in Company Provided Items,
         Drawings or Specifications. Nevertheless, such adjustment shall not be
         made insofar as the delay is due to Contractor not fulfilling its
         obligations in accordance with Art. 6.

         A Variation Order shall be issued in accordance with Art. 12 through 16
         in respect of adjustments in the Contract Schedule, Contract Price and
         other consequences resulting from Company's breach of Contract.
         Contractor loses its right to request a Variation Order if it has not
         made such request within 30 Days after discovery of the breach of
         Contract.

27.2     Contractor is entitled to terminate the Contract with immediate effect
         by notifying Company when:

         a)       Company has failed to make payment of an undisputed amount to
                  Contractor within 30 Days of such payment becoming due,

         b)       Company is in substantial breach of the Contract and has not
                  agreed to implement reasonable actions to cure the breach
                  within 14 Days, or

         c)       Company becomes insolvent.

PART 7   FORCE MAJEURE

ART. 28  EFFECTS OF FORCE MAJEURE

28.1     Except for Company's obligation to make payment in accordance with Art.
         20, a Party shall not be considered to be in default in the performance
         of its obligations to the extent that it proves that such performance
         has been prevented by Force Majeure. The Party affected by Force
         Majeure shall give written notice to the other Party as soon as
         possible, but not later than seven (7) days after having been so
         affected. Failure to give this notice shall preclude such Party from
         claiming Force Majeure.

28.2     Within 14 Days after a Force Majeure condition affecting Contractor's
         ability to perform its operations hereunder has ended, Contractor shall
         present any claim for adjustment of the Delivery Date with particulars
         of such claim. Such proposal shall state additional time necessary for
         repairs and other remedies, or for remobilization of personnel and
         equipment, and measures by Contractor to accelerate performance of the
         affected portion of the Work, or otherwise to mitigate the effect of
         Force Majeure.

28.3     If Company claims a Force Majeure situation and as a result is
         prevented from delivering the Company Supplied Items or otherwise
         carrying out other of its obligations to Contractor, Contractor shall
         have the right to submit a request for a Variation Order pursuant to
         Art. 12 through 16 for such additional compensation and extension of
         the Delivery Date as Contractor can document it is entitled to by
         reason of Company's inability to carry out its obligations to
         Contractor.



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28.4     The Party prevented from performing by the Force Majeure condition
         shall resume performance as soon as reasonably possible after the Force
         Majeure condition ceases.

28.5     If a Force Majeure situation lasts without interruption for 90 Days or
         more, then each Party shall have the right to cancel the Contract, by
         notice to the other Party. The provisions of Article 17.2, 17.4, 17.5
         and 17.6 shall apply accordingly.

28.6     WHEN THE DELIVERY DATE WHICH WOULD HAVE APPLIED IN THE ABSENCE OF FORCE
         MAJEURE IS REACHED AND FORCE MAJEURE STILL CONTINUES, COMPANY IS
         ENTITLED TO DEMAND DELIVERY OF THE CONTRACT OBJECT. COMPANY SHALL, IN
         ADDITION, ISSUE A VARIATION ORDER IN ACCORDANCE WITH ART. 12 THROUGH
         16, AS APPLICABLE.

28.7     A FAILURE OF THE PRODUCTS CAUSED BY OR CONTRIBUTED TO BECAUSE SUCH
         PRODUCTS IS NOT YEAR 2000 COMPLIANT AS DEFINED IN ART. 40 IN THIS
         CONTRACT IS NOT TO BE CONSIDERED AS A FORCE MAJEURE EVENT.

PART 8   LIABILITY AND INSURANCES

ART. 29  LOSS OF OR DAMAGE TO THE CONTRACT OBJECT OR COMPANY PROVIDED ITEMS

29.1     If loss of or damage to the Contract Object occurs between the start of
         the Work until the time when the Delivery Protocol has been signed or
         should have been signed in accordance with Art. 19.1 and 19.2,
         Contractor shall carry out necessary measures to ensure that the Work
         is completed in accordance with the Contract. The same applies if any
         loss of or damage to Materials or Company Provided Items occurs while
         they are at Site under any Contractor Indemnified Party's safekeeping
         and control.

         CONTRACTOR'S OBLIGATION TO CARRY OUT MEASURES STATED HEREIN APPLIES
         REGARDLESS OF WHETHER NEGLIGENCE IN ANY FORM HAS BEEN SHOWN BY ANY
         COMPANY INDEMNIFIED PARTY. However, in the case of such negligence by
         a Company Indemnified Party, any and all schedule delays will be
         addressed in accordance with the Variation Order procedures in Art. 12
         through 16.

29.2     Company agrees to procure and maintain during the period of the
         performance of the Work, a Builder's All Risk Insurance policy in
         accordance with Art. 31 covering all necessary repairs to or
         replacement of the Work and all Materials incorporated or to be
         incorporated therein. Company shall require its underwriters to name
         Contractor as co-insured under such policy and require its underwriters
         to waive all rights of subrogation against Contractor Indemnified
         Parties. Company shall assume liability and responsibility for any
         losses for which an exclusion applies. Company shall



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         deliver a certified copy of its Builder's All Risk Insurance to
         Contractor prior to the commencement of the Work.

29.3     Contractor shall be liable for the deductible associated with the
         Builder's All Risk Insurance referenced in Art. 29.2 up to a maximum as
         defined in Appendix I, above which amount Company shall be liable.

ART. 30  EXCLUSION OF LIABILITY - INDEMNIFICATION

30.1     Contractor Indemnity

         CONTRACTOR RELEASES EACH COMPANY INDEMNIFIED PARTY FROM ANY LIABILITY
         TO CONTRACTOR FOR, AND CONTRACTOR WILL DEFEND, INDEMNIFY AND HOLD EACH
         COMPANY INDEMNIFIED PARTY HARMLESS FROM AND AGAINST, ALL LOSSES, BY
         WHOMEVER BROUGHT, BASED ON PERSONAL INJURY OR DEATH, WHENEVER
         OCCURRING, SUFFERED OR INCURRED BY ANY CONTRACTOR INDEMNIFIED PARTY
         ARISING FROM OR RELATED IN ANY WAY TO PERFORMANCE OF THE WORK OR CAUSED
         BY THE CONTRACT OBJECT HEREUNDER, REGARDLESS OF HOW SUCH PERSONAL
         INJURY OR DEATH IS CAUSED AND EVEN IF CAUSED BY THE NEGLIGENCE, WHETHER
         SOLE OR CONCURRENT OR ACTIVE OR PASSIVE, OR OTHER LEGAL FAULT,
         INCLUDING STRICT LIABILITY THE UNSEAWORTHINESS OF ANY VESSEL AND THE
         UNAIRWORTHINESS OF ANY AIRCRAFT AND INCLUDING PRE-EXISTING CONDITIONS,
         OF ANY COMPANY INDEMNIFIED PARTY.

         CONTRACTOR RELEASES EACH COMPANY INDEMNIFIED PARTY FROM ANY LIABILITY
         TO CONTRACTOR FOR, AND CONTRACTOR WILL DEFEND, INDEMNIFY AND HOLD EACH
         COMPANY INDEMNIFIED PARTY HARMLESS FROM AND AGAINST, ALL LOSSES, BY
         WHOMEVER BROUGHT, BASED ON PROPERTY DAMAGE OR LOSS, WHENEVER OCCURRING,
         SUFFERED OR INCURRED BY EACH CONTRACTOR INDEMNIFIED PARTY ARISING FROM
         OR RELATED IN ANY WAY TO PERFORMANCE OF THE WORK OR THE CONTRACT OBJECT
         HEREUNDER, REGARDLESS OF HOW SUCH DAMAGE OR LOSS IS CAUSED AND EVEN IF
         CAUSED BY THE NEGLIGENCE, WHETHER SOLE OR CONCURRENT OR ACTIVE OR
         PASSIVE, OR OTHER LEGAL FAULT, INCLUDING STRICT LIABILITY, THE
         UNSEAWORTHINESS OF ANY VESSEL AND THE UNAIRWORTHINESS OF ANY AIRCRAFT
         AND INCLUDING PRE-EXISTING CONDITIONS, OF ANY COMPANY INDEMNIFIED
         PARTY; PROVIDED, HOWEVER, THAT CONTRACTOR'S INDEMNIFICATION OBLIGATIONS
         HEREUNDER SHALL NOT EXTEND TO ANY PORTION OF THE WORK FOR WHICH



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         COMPANY HAS EXPRESSLY ASSUMED THE RISK OF LOSS PURSUANT TO THIS
         AGREEMENT.

30.2     Company Indemnity

         COMPANY RELEASES EACH CONTRACTOR INDEMNIFIED PARTY FROM ANY LIABILITY
         TO COMPANY FOR, AND COMPANY WILL DEFEND, INDEMNIFY AND HOLD EACH
         CONTRACTOR INDEMNIFIED PARTY HARMLESS FROM AND AGAINST, ALL LOSSES, BY
         WHOMEVER BROUGHT, BASED ON PERSONAL INJURY OR DEATH, WHENEVER
         OCCURRING, SUFFERED OR INCURRED BY ANY COMPANY INDEMNIFIED PARTY
         ARISING FROM OR RELATED IN ANY WAY TO PERFORMANCE OF THE WORK OR CAUSED
         BY THE CONTRACT OBJECT HEREUNDER, REGARDLESS OF HOW SUCH PERSONAL
         INJURY OR DEATH IS CAUSED AND EVEN IF CAUSED BY THE NEGLIGENCE, WHETHER
         SOLE OR CONCURRENT OR ACTIVE OR PASSIVE, OR OTHER LEGAL FAULT,
         INCLUDING STRICT LIABILITY THE UNSEAWORTHINESS OF ANY VESSEL AND THE
         UNAIRWORTHINESS OF ANY AIRCRAFT AND INCLUDING PRE-EXISTING CONDITIONS,
         OF ANY CONTRACTOR INDEMNIFIED PARTY.

         COMPANY RELEASES EACH CONTRACTOR INDEMNIFIED PARTY FROM ANY LIABILITY
         TO COMPANY FOR, AND COMPANY WILL DEFEND, INDEMNIFY AND HOLD EACH
         CONTRACTOR INDEMNIFIED PARTY HARMLESS FROM AND AGAINST, ALL LOSSES, BY
         WHOMEVER BROUGHT, BASED ON PROPERTY DAMAGE OR LOSS, WHENEVER OCCURRING,
         SUFFERED OR INCURRED BY EACH COMPANY INDEMNIFIED PARTY ARISING FROM OR
         RELATED IN ANY WAY TO PERFORMANCE OF THE WORK OR THE CONTRACT OBJECT
         HEREUNDER, REGARDLESS OF HOW SUCH DAMAGE OR LOSS IS CAUSED AND EVEN IF
         CAUSED BY THE NEGLIGENCE, WHETHER SOLE OR CONCURRENT OR ACTIVE OR
         PASSIVE, OR OTHER LEGAL FAULT, INCLUDING STRICT LIABILITY, THE
         UNSEAWORTHINESS OF ANY VESSEL AND THE UNAIRWORTHINESS OF ANY AIRCRAFT
         AND INCLUDING PRE-EXISTING CONDITIONS, OF ANY CONTRACTOR INDEMNIFIED
         PARTY; PROVIDED, HOWEVER, THAT COMPANY'S INDEMNIFICATION OBLIGATIONS
         HEREUNDER SHALL NOT EXTEND TO ANY PORTION OF THE WORK FOR WHICH
         CONTRACTOR HAS EXPRESSLY ASSUMED THE RISK OF LOSS PURSUANT TO THIS
         AGREEMENT.



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30.3     Third Parties

         Until the issuance of the Acceptance Certificate, Contractor shall
         indemnify all Company Indemnified Parties from:

         a)       costs resulting from the requirements of public authorities
                  in connection with the removal of wrecks, or pollution from
                  vessels or other floating devices provided by Contractor
                  Indemnified Parties for use in connection with the Work
                  (subject to Art. 39), and

         b)       claims arising out of loss or damage suffered by anyone other
                  than a Contractor Indemnified Party and a Company Indemnified
                  Party in connection with the Work or caused by the Contract
                  Object,

         but only to the extent of Contractor Indemnified Parties' negligence or
         other fault attributable to Contractor Indemnified Parties.

         Company shall indemnify Contractor Indemnified Parties from and against
         claims mentioned in the paragraph above, to the extent that they exceed
         the limitations of liability mentioned in Art. 30.4 below, regardless
         of any form of liability, whether strict liability or by negligence
         (including sole or concurrent or active or passive) in whatever form by
         Contractor Indemnified Parties.

         After issue of the Acceptance Certificate, Company shall indemnify
         Contractor Indemnified Parties from and against any claims of the kind
         mentioned in Art. 30.3 a) and b) above, regardless of any form of
         liability, whether strict liability or by negligence (including sole or
         concurrent or active or passive) in whatever form by Contractor
         Indemnified Parties. Further, after issue of the Acceptance
         Certificate, Contractor shall be under no responsibility to insure
         against any risk or liabilities in relation to the Contract.

30.4     Limitations on Liability

         Contractor's liability for loss or damage arising out of each incident
         as provided in Art. 30.1 through 30.3 shall be limited to US$1,000,000.
         However, this does not apply to Contractor's liability for loss or
         damage for each incident covered by insurances provided in accordance
         with Art. 31.2, where Contractor's liability extends to the sum
         recovered under the insurance for the loss of damage. In addition,
         Contractor should obtain Excess Liability Insurance serving to increase
         primary limits to other required coverages to US$24,000,000 per
         occurrence. The Excess Liability Insurance shall remain in force until
         issuance of the Acceptance Certificate.

30.5     Proprietary and Intellectual Property Indemnity and Related Matters

         CONTRACTOR shall indemnify and hold each COMPANY INDEMNIFIED PARTY
         harmless from suits, claims or cause of actions resulting from
         infringement of an industrial property right in connection with the
         work, or any



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         COMPANY INDEMNIFIED PARTY'S use of the CONTRACT OBJECT. Industrial
         property rights include patent, trademark, copyright, unfair
         competition and trade secret rights.

         CONTRACTOR shall be liable for any damages, including increased damages
         because of willful and/or intentional acts, an award of attorneys fees
         that includes the third party attorneys fees, and/or prejudgment
         interest, incurred by any COMPANY INDEMNIFIED PARTY as a result of a
         suit, claim or cause of action for infringement of any industrial
         property right of any third party, which claim or cause of action
         arises from the purchase or use of the work or CONTRACT OBJECT.

         CONTRACTOR agrees to defend each COMPANY INDEMNIFIED PARTY and their
         privies against all suits, claims and causes of action for infringement
         by the work or CONTRACT OBJECT of the industrial property rights of any
         third party.

         If a temporary, preliminary or a permanent injunction is obtained
         against any COMPANY INDEMNIFIED PARTY'S use of the work or CONTRACT
         OBJECT, or any portion thereof by reason of an infringement of an
         industrial property right, CONTRACTOR will, at its option and expense,
         use commercially reasonable effort to either

            (i)   Procure for any COMPANY INDEMNIFIED PARTY the right to
                  continue using the work and CONTRACT OBJECT, or

            (ii)  Replace or modify for any COMPANY INDEMNIFIED PARTY the work
                  and CONTRACT OBJECT or such infringing portion thereof so that
                  it no longer infringes such industrial property right, so long
                  as the utility or performance of the work and CONTRACT OBJECT
                  is not adversely affected by such replacement or modification
                  and the work and CONTRACT OBJECT continues to materially
                  conform with the specifications of the work or CONTRACT
                  OBJECT.

         If COMPANY INDEMNIFIED PARTY is damaged as a result from non-use of the
         work or CONTRACT OBJECT purchased under this contract, where non-use
         results from a court order not to make or use the work or CONTRACT
         OBJECT as a result of a lawsuit brought by a third party for
         infringement by the work or CONTRACT OBJECT of an industrial property
         right, then COMPANY INDEMNIFIED PARTY shall be reimbursed from
         contractor for actual damages from said non-use incurred by COMPANY
         INDEMNIFIED PARTY up to a limit of $1,000,000.

         CONTRACTOR shall also indemnify and hold each COMPANY INDEMNIFIED PARTY
         harmless for any claim, cause of action or suit, such as for trade and
         business torts, for use of the work or CONTRACT OBJECT



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         Under the contract which is caused in whole or part by CONTRACTOR,
         which is brought against a COMPANY INDEMNIFIED PARTY by a third party.
         CONTRACTOR shall defend and pay all costs and expenses in defending a
         claim, cause of action or suit for such dispute.

         The provisions of this section on defense and indemnification shall
         survive the expiration of the term of this contract. The privileges and
         benefits enjoyed under this section on defense and indemnification
         shall inure to the benefit of COMPANY INDEMNIFIED PARTIES' privies,
         including a subsequent owner of an interest of any COMPANY INDEMNIFIED
         PARTY.

         If it becomes necessary for COMPANY INDEMNIFIED PARTIES to enforce this
         indemnification provision against CONTRACTOR, CONTRACTOR shall pay for
         COMPANY INDEMNIFIED PARTIES' attorneys' fees, court costs, litigation
         expenses and any other costs or expenses associated with the
         enforcement action.

30.6     Notice of Claim

         Whenever any claim shall arise for indemnification hereunder, the
         indemnified party shall promptly notify the indemnifying party of the
         claim and, when known, the facts constituting the basis for such claim,
         except that in the event of any claim for indemnification hereunder
         resulting from or in connection with any claim or legal proceedings by
         a Third Party, such notice shall specify, if known, the amount or an
         estimate of the amount of the liability arising therefrom.

         The Parties shall give each other information and other assistance
         needed for handling the claim. Neither Party shall, without the consent
         of the other Party, approve of a claim which shall be indemnified, in
         whole or in part, by the other Party.

30.7     Consequential Damages

         Notwithstanding anything to the contrary contained elsewhere in this
         Contract, no Company Indemnified Party or Contractor Indemnified Party
         shall be liable to any member of the other group for any consequential,
         incidental or indirect damages (whether liquidated or unliquidated),
         including, but not limited to, loss of use, loss of profit, loss of
         revenue, loss of product or production, reservoir damage, or loss of
         hole, damage due to blowout or cratering, whenever arising under this
         Contract or as a result of, relating to or in connection with the Work
         under the Contract and no claim shall be made by any Contract
         Indemnified Party Group or Company Indemnified Party against any member
         of the other group regardless of whether such claim is based or claimed
         to be based on negligence (including, sole, joint, active, passive,
         concurrent or gross negligence), unseaworthiness, unairworthiness,
         fault, breach of warranty, breach of agreement, statute, strict
         liability or otherwise.



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Art. 31  INSURANCES

31.1     Company shall provide and maintain the insurances described below and
         in Appendix I - Company's Insurances, etc.

         a)       Builder's all risk insurance, or equivalent insurance,
                  covering the Contract Object, Materials and Company Provided
                  Items against physical loss or damage, in accordance with the
                  insurance conditions.

         b)       Transport insurance covering the Contract Object, Materials
                  and Company Provided Items against physical loss or damage
                  during transportation, in accordance with the insurance
                  conditions.

         c)       Liability insurance covering Company's liability under Art.
                  30.3 for claims arising from each accident.

         Such insurance coverage shall be effective from the start of the Work
         and shall not expire until issue of the Acceptance Certificate.

         The policies shall state that Company and Contractor are named
         insureds, and the insurers shall waive any right of subrogation against
         Contractor Indemnified Parties, but only to the extent of Contractor
         Indemnified Parties' obligations under this Contract.

31.2     Contractor shall, and shall cause each authorized subcontractor to,
         carry insurance as specified in Appendix O.

31.3     If one of the Parties fails to take out insurance according to its
         obligations of this Article, then the other Party is entitled to take
         out such insurance and claim a refund of the costs from the Party in
         default.

31.4     When any incident occurs for which coverage is granted under one of the
         Parties' insurance policies, the other Party shall notify that Party
         without undue delay, enclosing a description of the incident that gives
         rise to the insurance claim. When the Party whose insurance policy
         covers the claim, handles the claim, the other Party shall provide it
         with reasonable assistance, without claiming compensation.

31.5     Each Party shall support its mutual indemnity obligations with respect
         to injury or death of any Person or damage to or loss of property by
         liability insurance coverage in the amounts set forth herein.

PART 9   PROPRIETARY RIGHTS, ETC.

ART. 32  RIGHTS TO DOCUMENTS AND COMPUTER PROGRAMS

32.1     Documents and computer programs provided by Company to Contractor, or
         which are developed mainly on the basis of such documents and computer
         programs, shall



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         remain the exclusive property of Company. The same applies to all
         copies of the aforementioned documents and computer programs.

         Such documents, computer programs or copies shall not be used by
         Contractor other than for the purpose of the Work. Such documents,
         computer programs or copies shall be returned to Company at the
         expiration of the Contract, unless otherwise agreed between Company and
         Contractor.

32.2     Documents and computer programs provided by Contractor to Company, or
         which are developed mainly on the basis of such documents and computer
         programs, including, but not limited to, technical data, design,
         drawings, plans, reports, specifications and other materials employed
         in the design, fabrication, assembly, installation and operation of the
         Work, shall remain the exclusive property of Contractor. The same
         applies to all copies of the aforementioned documents and computer
         programs.

         Company shall be entitled to use such documents, computer programs and
         copies only in connection with the operation, repair, modification and
         maintenance of the Contract Object or Contractor supplied equipment,
         unless otherwise prescribed in Appendix K - Contractor's Proprietary
         Information.

32.3     All other documents, computer programs and copies thereof developed by
         Contractor or its Affiliate in connection with the Work shall be the
         property of Contractor.

         Company shall be entitled to use such documents, computer programs and
         copies only in connection with the operation, repair, modification and
         maintenance of the Contract Object or Contractor supplied equipment,
         unless otherwise prescribed in Appendix K - Contractor's Proprietary
         Information.

32.4     The Parties shall ensure that all those who have access to such
         documents, computer programs and copies thereof as referenced in Art.
         32.1 through 32.3 shall comply with the provisions of this Contract.
         Further, any Third Party to receive such documents shall be required by
         the Party disclosing the documents, prior to communication of the
         information, to execute a written covenant and confidentiality
         agreement with such Party on the same terms specified in this Art. 32
         and in Art. 34.1.

ART. 33  INVENTIONS

33.1     Inventions made by Contractor during the performance of the Work shall
         be the property of Contractor. This does not apply, however, to
         inventions mainly based on technical information received from Company
         under Art. 32.1, which inventions shall be the exclusive property of
         Company.

         Contractor shall notify Company of all inventions which shall be
         Company's exclusive property, and Contractor shall provide the
         necessary assistance to enable



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         Company to acquire the patents to the inventions. Company shall pay
         Contractor for all reasonable costs in connection with such assistance,
         including compensation to Contractor's employees or others, in
         accordance with applicable law or general agreements concerning
         compensation for inventions.

33.2     Company shall grant to Contractor an irrevocable, royalty-free,
         non-exclusive license to inventions which are Company's exclusive
         property in accordance with Art. 33.1.

33.3     Contractor shall grant to Company an irrevocable, royalty-free,
         non-exclusive license to all inventions which are under, or which prior
         to delivery of the Contract Object come under, Contractor's control, to
         the extent necessary for Contractor to perform the Work, or for the
         operation, maintenance, modification and repair of the Contract Object.

         Contractor shall also grant to Company an irrevocable, royalty-free,
         non-exclusive license to inventions made by Contractor in connection
         with the Work and which are based on technical information from both
         Parties, without any of them providing the main part of such
         information. The license shall include a right to use the invention in
         construction of objects of whatever kind, provided, however, that the
         license under this paragraph shall at all times be restricted to
         operations where Company is an operator, and shall at no time include a
         right to sublicense.

         Company shall also grant to Contractor an irrevocable, royalty-free,
         non-exclusive license to inventions made by Company in connection with
         the Work and which are based on technical information from both
         Parties, without any of them providing the main part of such
         information. The license shall include a right to use the invention in
         construction of objects of whatever kind, provided, however, that the
         license under this paragraph shall at no time include a right to
         sublicense.

ART. 34  CONFIDENTIAL INFORMATION

34.1     All information exchanged between the Parties shall be treated as
         confidential and shall not be disclosed to a Third Party without the
         other Party's written permission, unless such information:

         a)       may be disclosed to a Third Party in accordance with Art. 32
                  and 33,

         b)       is already known to the party in question at the time the
                  information was received,

         c)       is or becomes part of the public domain other than through a
                  fault of a Company Indemnified Party or a Contractor
                  Indemnified Party,

         d)       is rightfully received from a Third Party, without an
                  obligation of confidentiality.



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         Each of the Parties may, however, use or disclose confidential
         information to a Third Party, to the extent necessary for the
         performance of and control of the Work and use of the Contract
         Object. In such cases the Parties, prior to disclosing the confidential
         information to the Third Party, shall ensure that the Third Party
         executes a written covenant and confidentiality agreement in accordance
         with Art. 32, 33 and 34, as such Articles are applicable to the
         confidential information being disclosed.

34.2     Contractor shall not publish information concerning the Work or the
         Contract without Company's written approval. This approval shall not
         unreasonably be withheld.

PART 10  OTHER PROVISIONS

ART. 35  ASSIGNMENT OF THE CONTRACT, ETC.

35.1     Company may assign its rights and obligations under the Contract to a
         Third Party, provided that Company can demonstrate that the assignee
         has the financial strength required to fulfil Company's obligations
         under the Contract. At Contractor's request, Company shall provide a
         guarantee satisfactory to Contractor of the Third Party's performance.

35.2     Contractor may not assign or mortgage the Contract, or a part or
         interest in it, to a Third Party without Company's written approval.
         Such approval is not required for an assignment or mortgage to a bank
         or other financial enterprise.

ART. 36  NOTICES

         All notices, claims and other notification to be given in accordance
         with the provisions of the Contract shall be submitted in writing to
         the relevant Party's representative under Art. 3, with such address as
         given in Appendix D - Administration Requirements or as changed by
         notice.

ART. 37  UNITED STATES LAW AND DISPUTES

37.1     Choice of Law

         THIS CONTRACT SHALL BE DEEMED TO BE A CONTRACT UNDER, AND SHALL BE
         CONSTRUED, INTERPRETED AND GOVERNED BY AND ACCORDING TO, THE LAWS OF
         THE STATE OF TEXAS, EXCLUDING ANY CONFLICT OF LAWS PRINCIPLES WHICH, IF
         APPLIED, MIGHT PERMIT OR REQUIRE THE APPLICATION OF THE LAWS OF ANOTHER
         JURISDICTION. NON-EXCLUSIVE VENUE FOR ANY LEGAL PROCEEDING ARISING FROM
         OR RELATING TO THIS CONTRACT SHALL BE HOUSTON, HARRIS COUNTY, TEXAS.

37.2     Dispute Resolution



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         The Parties recognize that the amicable settlement of disputes is in
         their mutual best interests. As such, the Parties agree to promptly
         notify the other Party of any dispute and to engage in good faith
         consultations to resolve such a dispute. If such consultations do not
         resolve the dispute within 30 Days of notification thereof, the Parties
         agree to submit any dispute to consultations to resolve such a dispute.
         If such consultations do not resolve the dispute within 30 Days of
         notification thereof, the Parties agree to submit any dispute to
         consultations between the Chief Executive Officer of MODEC
         International LLC and the President, chief executive office or
         principal of the Company. If such consultations fail to resolve such a
         dispute within 30 Days, either Party may submit the matter to
         arbitration under American Arbitration Association Construction
         Industry Rules as presently in force. The number of arbitrators will be
         one. The arbitration will be conducted by one mutually agreed
         arbitrator (or in the absence of agreement, by an arbitrator appointed
         by the administering body for the arbitration). The arbitrator shall
         agree that time is of the essence in the rendering of a decision. The
         place of the arbitration shall be Houston, Texas and the arbitration
         shall be conducted in English. The arbitrator shall be empowered to
         order injunctive relief but shall not be empowered to award damages in
         excess of compensatory damages and each Party hereby irrevocably waives
         any right to recover such damages with respect to any dispute resolved
         by arbitration. The decision of the arbitrator will be final and
         binding upon each Party and may be enforced in any court of competent
         jurisdiction. The cost and expenses of any such arbitration, including
         the legal expenses of the prevailing Party, will be borne as determined
         by the arbitrator. Neither Party shall be excused from the performance
         of its obligations, alternative dispute resolution or litigation
         relating hereto. Notwithstanding this provision, nothing in this
         Contract shall preclude either Party from seeking injunctive relief
         from a court of competent jurisdiction to preserve the status quo
         during the pendency of the dispute nor shall either Party be precluded
         from seeking appropriate judicial relief to enforce or preserve
         separately available statutory rights.

         All statutes of limitations which would otherwise apply to an action at
         law would apply to an action under this arbitration provision.

ART. 38  EQUAL EMPLOYMENT OPPORTUNITY PROVISIONS

         In order to ensure compliance with the Equal Employment Opportunity
         provisions of Executive Orders 11246, 11375, 11598, 11141, and 11758,
         the Contractor agrees to and shall be bound by these provisions and
         all rules and regulations promulgated thereunder, and with all
         amendments and additions thereto.

         Contractor shall be bound by and agrees to the following provisions as
         contained in Section 202 of Executive Order 11246, to wit:

         (1)      Contractor will not discriminate against any employee or
                  applicant for employment because of race, color, religion,
                  sex, age or national origin. The



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                  Contractor will take affirmative action to ensure that
                  applicants are employed, and that employees are treated during
                  employment, without regard to their race, color, religion,
                  sex, or national origin. Such action shall include, but not be
                  Limited to the following. Employment, upgrading, demotion, or
                  transfer, recruitment or recruitment advertising, layoff or
                  termination rates of pay or other forms of compensation; and
                  selection for training, including apprenticeship. The
                  Contractor agrees to post in conspicuous places, available to
                  employees and applicants for employment, notice to be provided
                  by the contracting officer setting forth the provisions of
                  this nondiscrimination clause.

         (2)      Contractor will, in all solicitations or advertisements for
                  employees placed by or on behalf of the Contractor, state that
                  all qualified applicants will receive consideration for
                  employment without regard to race, color, religion, sex, age
                  or national origin.

         (3)      Contractor will send to each labor union or representative of
                  workers with which he has a collective bargaining agreement or
                  other contract or understanding, a notice, to be provided by
                  the agency contracting officer, advising the labor union or
                  worker's representative of the Contractor's commitments under
                  Section 202 of Executive Order 11246 of September 24, 1965,
                  and shall post copies of the notice in conspicuous places
                  available to employees and applicants for employment.

         (4)      Contractor will comply with all provisions of Executive Order
                  11246 of September 24, 1965, and of the rules, regulations,
                  and relevant orders of the Secretary of Labor.

         (5)      Contractor will furnish all information and reports required
                  by Executive Order 11246 of September 24, 1965, and by the
                  rules, regulations, and orders of the Secretary of Labor, or
                  pursuant thereto, and will permit access to its books,
                  records, and accounts by the contracting agency and the
                  Secretary of Labor for the purposes of investigation to
                  ascertain compliance with such rules, regulations and orders.

         6)       In the event of the Contractor's noncompliance with the
                  nondiscrimination clauses of this contract or with any such
                  rules, regulations, or orders, this contract may be cancelled,
                  terminated or suspended in whole or in part and the Contractor
                  may be declared ineligible for further Government contracts in
                  accordance with procedures authorized in Executive Order 11246
                  of September 24, 1965, and such other sanctions may be imposed
                  and remedies invoked as provided in Executive Order 11246 of
                  September 24, 1965, or by rule, regulation, or order of the
                  Secretary of Labor, or as otherwise provided by law.



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         7)       Contractor will include the provisions of Sections I.A.(1)
                  through I.A.(7) in every subcontract or purchase order unless
                  exempted by rules, regulations or orders of the Secretary of
                  Labor issued pursuant to Section 204 of Executive Order 11246
                  of September 24, 1965, so that such provisions will be binding
                  upon each subcontractor or vendor. The Contractor will take
                  such action with respect to any subcontract or purchase order
                  as the contracting agency may direct as a means of enforcing
                  such provisions including sanctions for noncompliance:
                  PROVIDED, HOWEVER, that in the event the Contractor becomes
                  involved in, or is threatened with, litigation with a
                  subcontractor or vendor as a result of such direction by the
                  contracting agency, the Contractor may request the United
                  States to enter into such litigation to protect the interests
                  of the United States.

         Contractor certifies that he does not maintain or provide for its
         employees any segregated facilities at any of its establishments, and
         that he does not permit its employees to perform their services at any
         locations, under this contract where segregated facilities are
         maintained. He certifies further that he will not maintain or provide
         for its employees any segregated facilities at any of its
         establishments, and that he will not permit location, under its
         control, where segregated facilities are maintained. Contractor agrees
         that a breach of this certification is a violation of the Equal
         Opportunity Clause in this contract. As used in this certification, the
         term "segregated facilities" means any waiting rooms, work areas, rest
         rooms and wash rooms and other storage or dressing areas, parking lots,
         drinking fountains, recreation or entertainment area, transportation
         and housing facilities provided for employees which are segregated by
         explicit directive or are in fact segregated on the basis of race,
         creed, color, or national origin, because of habit, local custom or
         otherwise. He further agrees that (Except where he has obtained
         identical certifications from proposed subcontractors for specific time
         periods) he will obtain identical certifications from proposed
         subcontractors prior to the award of subcontractors exceeding $10,000
         which are not exempt from the provisions of Equal Opportunity Clause;
         that he will retain such certifications in its files; and that he will
         forward the following notice to such proposed subcontractors (except
         where the proposed subcontractors have submitted identical
         certifications for specific time periods):

         NOTICE TO PROSPECTIVE SUBCONTRACTORS OF REQUIREMENT FOR CERTIFICATIONS
         ON NONSEGREGATED FACILITIES

         A Certification of Nonsegregated Facilities as required by the May 9,
         1965, order on Elimination of Segregated Facilities, by the Secretary
         of Labor 932 Fed. Reg. 7439, May 19, 1967), must be submitted prior to
         the award of a subcontract exceeding $10,000 which is not exempt from
         the provisions of the Equal Opportunity Clause. The Certification may
         be submitted either for each subcontract or for all subcontracts during
         a period (i.e., quarterly, semiannually, or annually). (1968 MAR.)
         (Note: The penalty for making false statements in offers is prescribed
         in 18 U.S.C. Section 1001.)



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ART. 39  POLLUTION CONTROL AND RESPONSIBILITY

39.1     During the performance of the Work under this Contract, the
         responsibility of Company and the Contractor for control and removal of
         pollution or contaminations shall be defined as follows:

39.2     Conduct of Operations

         Each Contractor Indemnified Party shall exercise all reasonable
         diligence to conduct its operations in a manner that will prevent
         pollution and each Contractor Indemnified Party shall comply with all
         applicable laws, ordinances, rules, regulations and lease or contract
         provisions regarding pollution, including without limitation those of
         the U.S. Coast Guard, U.S. Army Corps of Engineers, U.S. Geological
         Survey, and U.S. Department of Interior. No Contractor Indemnified
         Party shall permit trash, waste oil, bilge water, or other pollutants
         to be discharged or to escape into the sea. Each Contractor Indemnified
         Party will take reasonable measures to instruct its personnel in such
         matters and to prevent such pollution and will clean up such pollution
         caused by it in the course of operations relating to this Contract.
         Contractor shall provide Company with a copy of all environmental
         response plans covering work conducted hereunder prior to commencement
         of such work. It is not intended hereby to limit or conflict with the
         responsibilities of Company and Contractor as further defined within
         this Exhibit.

39.3     Contractor's Responsibilities

         Contractor shall assume all responsibility for, including control and
         removal of, and release, indemnify and hold each Company Indemnified
         Party harmless against and from loss, cost or damage arising from
         pollution or contamination:

         (1)      Which originates above the surface of the land or water:

                  (a)      from spills or leaks of fuels, lubricants, motor oil,
                           pipe dope, paints, solvents, ballasts, bilge,
                           garbage, sewerage, and other materials exclusive of
                           those covered by subpart (b) below, in each
                           Contractor Indemnified Party's possession and
                           control, WHETHER CAUSED OR BROUGHT ABOUT BY ANY
                           COMPANY INDEMNIFIED PARTY'S NEGLIGENCE (INCLUDING
                           ACTIVE, PASSIVE, SOLE, JOINT OR CONCURRENT
                           NEGLIGENCE) OR ANY OTHER THEORY OF LEGAL LIABILITY,
                           INCLUDING STRICT LIABILITY, THE UNSEAWORTHINESS OF
                           ANY VESSEL AND THE UNAIRWORTHINESS OF ANY AIRCRAFT
                           AND INCLUDING PRE-EXISTING CONDITIONS.

                  (b)      from spills, leaks or dumping of oil emulsion, oil
                           base or chemically treated drilling fluids,
                           contaminated cuttings and lost circulation and fish
                           recovery materials and fluids, when said materials
                           are in each



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                           Contractor Indemnified Party's possession, although
                           their use or disposition may be at Company's
                           direction, and such spill, leak or dumping is a
                           result of any Contractor Indemnified Party's acts or
                           omissions;

         (2)      Resulting from fire, blowout, cratering, seepage, or any other
                  uncontrolled flow, from surface or subsurface, of oil, gas or
                  water from wells during the conduct of operations hereunder
                  when caused by any Contractor Indemnified Party's acts or
                  omissions, but only up to and not in excess of the first
                  $500,000 per occurrence of such loss, cost or damage;

         (3)      Resulting from leaking or other uncontrolled flow of oil, gas
                  or water from pipelines, including lines on or in submerged
                  lands, ruptured or damaged by any Contractor Indemnified
                  Party's rig, barge, anchors or other equipment, or by any
                  Contractor Indemnified Party's operations, when such rupture
                  or damage is caused by any Contractor Indemnified Party's acts
                  or omissions, but only up to and not in excess of the first
                  $500,000 per occurrence of such loss, cost or damage.

39.4     Company's Responsibilities

         Company shall assume all responsibility for, including control and
         removal of, and release, indemnify and hold each Contractor Indemnified
         Party harmless against and from loss, cost or damage arising from
         pollution or contamination:

         (1)      Resulting from fire, blowout, cratering, seepage, or any other
                  uncontrolled flow of oil, gas or water from wells during the
                  conduct of operations hereunder when not resulting from any
                  Contractor Indemnified Party's acts or omissions and,
                  excluding the first $500,000 per occurrence of such loss, cost
                  or damage, WHETHER CAUSED OR BROUGHT ABOUT BY ANY CONTRACTOR
                  INDEMNIFIED PARTY'S NEGLIGENCE (INCLUDING ACTIVE, PASSIVE,
                  SOLE, JOINT OR CONCURRENT NEGLIGENCE) OR ANY OTHER THEORY OF
                  LEGAL LIABILITY, INCLUDING STRICT LIABILITY, THE
                  UNSEAWORTHINESS OF ANY VESSEL AND THE UNAIRWORTHINESS OF ANY
                  AIRCRAFT AND INCLUDING PRE-EXISTING CONDITIONS.

         (2)      Resulting, except as provided in Art. 39.3(1)(b) above, from
                  possession, use or disposition of oil emulsion, oil base or
                  chemically treated drilling fluids, contaminated cuttings,
                  lost circulation, fish recovery materials and fluids,
                  including such possession, use or disposition by any Company
                  Indemnified Party;

         (3)      Resulting from leakage or other uncontrolled flow of oil, gas
                  or water from pipelines, including lines on or in submerged
                  lands, ruptured or damaged by Contractor Indemnified Party's
                  barge, anchors, or other equipment, or by



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                  Contractor Indemnified Party's operations, when such rupture
                  or damage is not caused by Contractor Indemnified Party's acts
                  or omissions, and excluding the first $500,000 per occurrence
                  of such loss, cost or damage, WHETHER CAUSED OR BROUGHT ABOUT
                  BY ANY CONTRACTOR INDEMNIFIED PARTY'S NEGLIGENCE (INCLUDING
                  ACTIVE, PASSIVE, SOLE, JOINT OR CONCURRENT NEGLIGENCE) OR ANY
                  OTHER THEORY OF LEGAL LIABILITY, INCLUDING STRICT LIABILITY,
                  THE UNSEAWORTHINESS OF ANY VESSEL AND THE UNAIRWORTHINESS OF
                  ANY AIRCRAFT AND INCLUDING PRE-EXISTING CONDITIONS.

39.5     Agreement

         Without relieving Contractor of any of its obligations above provided,
         it is agreed that Company may take part to any degree it deems
         necessary in the control and removal of any pollution or contamination
         which is the responsibility of Contractor under the foregoing
         provisions; and Contractor shall reimburse Company for the cost
         thereof, subject to any limitations above provided, upon the receipt of
         billing therefor from Company.

ART. 40  YEAR 2000 WARRANTY

40.1     Contractor hereby represents and warrants to Company that all Products
         are and will be Year 2000 Compliant.

40.2     This representation and warranty shall survive until the earlier of 24
         months or upon termination of this Contract. In the event that such
         warranty compliance requires the acquisition of additional Products,
         the expense for any such associated or additional acquisitions which
         may be required (including, without limitation, data conversion tools)
         shall be borne exclusively by supplier.

         As used herein, "Year 2000 Compliant" means the Product will:

         A.       function without interruption or human intervention with
                  four-digit year processing on all Date Data, including errors
                  or interruptions from functions which may involve Date Data
                  from more than one century or leap years, regardless of the
                  date of processing or date of Date Data ("Date Data" means
                  any data, input, or output which includes an indication of
                  date);

         B.       provide results from any operation accurately reflecting any
                  Date Data used in the operation performed, with output in any
                  form, except graphics, having four-digit years;

         C.       accept two-digit year Date Data in a manner that resolves any
                  ambiguities as to century in a defined manner; and



                                       43
<PAGE>   50

DELOS OFFSHORE COMPANY, L.L.C.                  SUNDAY SILENCE FIELD DEVELOPMENT
                                                           FABRICATION AGREEMENT
================================================================================

         D.       provide data interchange in the ISO 8601:1988 standard of
                  CCYYMMDD

40.3     This warranty shall apply to all Products delivered by supplier now or
         in the future, including all bug fixes, patches, updates, enhancements,
         new development, or other software, equipment or documentation. A
         Product (as such term is defined herein) failure caused by or
         contributed to be because such Product is not Year 2000 Compliant, as
         defined above, is not a Force Majeure event.

ART. 41  MISCELLANEOUS

41.1     Taxes

         Any duties or tariffs or state or county sales, use or ad valorem taxes
         which become payable to any authority as a consequence of the
         performance of the Work shall be paid by Company and Company shall
         provide Contractor a sales tax exemption certificate; however,
         Contractor agrees to PROTECT AND KEEP COMPANY SAFE AND HARMLESS against
         all taxes and fines, penalties, and interest thereon assessed or
         levied against or on account of the Work related to wages, salaries, or
         other benefits paid to Contractor's employees or employees of
         Contractor's subcontractors. Contractor will promptly forward all tax
         assessments and similar statements or notices to Company for which
         Company is responsible.

41.2     Effective Date

         The effective date of this Contract shall be the date on which this
         Contract is fully executed by authorized signatories of each of the
         Parties.

41.3     Amendments

         This Contract may not be amended, nor any provision hereof waived,
         except by a written amendment executed with the same formality as this
         Contract and executed by duly authorized representatives of the
         respective Parties.

41.4     Entire Agreement

         This Contract constitutes the sole and only agreement of the Parties
         and supersedes any prior understandings or written or oral agreements
         between the Parties respecting the within subject matter. No agent,
         employee or representative of Company has any authority to bind Company
         to any affirmation, representation or warranty outside of, or in
         conflict with, the stated terms of this Contract, and Contractor hereby
         stipulates that it has not relied and will not rely on such an
         affirmation, representation or warranty.

41.5     Counterparts



                                       44
<PAGE>   51

DELOS OFFSHORE COMPANY, L.L.C.                  SUNDAY SILENCE FIELD DEVELOPMENT
                                                           FABRICATION AGREEMENT
================================================================================

         This Contract may be executed in multiple counterparts, each of which,
         when executed, shall be deemed an original, and all of which shall
         constitute but one and the same instrument.

41.6     Further Assurances

         Subject to the terms and conditions set forth in this Contract, each of
         the Parties agrees to use all reasonable efforts to take, or to cause
         to be taken, all actions, and to do, or to cause to be done, all things
         necessary, proper or advisable under applicable laws and regulations to
         consummate and make effective the transactions contemplated by this
         Contract. In case, at any time after the execution of this Contract,
         any further action is necessary or desirable to carry out its purposes,
         the proper officers or directors of the Parties shall take or cause to
         be taken all such necessary action.

41.7     Severability

         Any term or provision of this Contract that is invalid or unenforceable
         in any jurisdiction shall be ineffective as to such jurisdiction, to
         the extent of such invalidity or unenforceability, without rendering
         invalid or unenforceable the remaining terms and provisions of this
         Contract or affecting the validity or enforceability of any terms and
         provisions of this Contract in any other jurisdiction. If any provision
         of this Contract is so broad as to be unenforceable, each provision
         shall be interpreted to be only so broad as is enforceable. A
         bankruptcy or similar trustee must accept or, to the extent permitted
         by law, reject this Contract in its entirety.

41.8     Waiver

         Neither action taken (including, without limitation, any investigation
         by or on behalf of either Party) nor inaction pursuant to this
         Contract, shall be deemed to constitute a waiver of compliance with any
         representation, warranty, covenant or agreement contained herein by the
         Party not committing such action or inaction. A waiver by any Party of
         a particular right, including, without limitation, breach of any
         provision of this Contract, shall not operate or be construed as a
         subsequent waiver of that same right or a waiver of any other right.


41.9     No Third Party Beneficiaries

         Except to the extent a third party is expressly given rights herein,
         any agreement herein contained, expressed or implied, shall be only for
         the benefit of the Parties and their respective legal representatives,
         successors, and assigns, and such agreements or assumption shall not
         inure to the benefit of any other Person whomsoever, it being the
         intention of the Parties that no Person shall be deemed a third party
         beneficiary of this Contract except to the extent a third party is
         expressly given rights herein.



                                       45
<PAGE>   52

DELOS OFFSHORE COMPANY, L.L.C.                  SUNDAY SILENCE FIELD DEVELOPMENT
                                                           FABRICATION AGREEMENT
================================================================================

ART. 42  OPTION

42.1     For a period of 36 months from the Effective Date for the Sunday
         Silence unit, Contractor will execute projects and deliver the
         additional MOSE TI_P platforms to Company with all costs to Contractor,
         passed through to Company. Contractor will earn a discounted profit of
         6% on the total contract value as its profit.

42.2     In addition, Company and Contractor will agree to mutually acceptable
         incentives and penalties to cost and schedule.

42.3     Contractor will negotiate option pricing for a second unit from its
         vendors and sub-contractors, on a component basis, when placing the
         purchase order/contract for scopes of work for the Sunday Silence
         unit. Contractor will make its best efforts to obtain this option
         pricing at about the same pricing level as the components for the
         first unit. To the extent possible, this option pricing will be valid
         for a period of 12 months from the date of purchase order or
         subcontract from Contractor, or longer if possible to obtain from the
         vendor/sub-contractor. Contractor wishes to highlight that
         approximately 80% of the total cost of the unit is from vendors and
         sub-contractors. This mechanism will allow the prices, by component,
         to be firmed up at least for the next 12 months at the low levels
         available in today's depressed market conditions.

                 [Remainder of Page Intentionally Left Blank.]



                                       46
<PAGE>   53

DELOS OFFSHORE COMPANY, L.L.C.                  SUNDAY SILENCE FIELD DEVELOPMENT
                                                           FABRICATION AGREEMENT
================================================================================

          IN WITNESS WHEREOF, Contractor and Company have caused this
Fabrication Agreement to be duly executed and delivered as of the date and year
first above written.

                                       COMPANY

                                       DELOS OFFSHORE COMPANY, LLC.


                                       /s/ JAMES H. LYTAL
                                       -----------------------------------------
                                       James H. Lytal
                                       President

                                       CONTRACTOR

                                       MODEC INTERNATIONAL LLC


                                       /s/ K. MATAUNAGA
                                       -----------------------------------------
                                       Name: K. MATAUNAGA
                                            ------------------------------------
                                       Title: PRESIDENT & CEO
                                             -----------------------------------

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM CONSOLIDATED
STATEMENTS OF INCOME AND CONSOLIDATED BALANCE SHEETS
</LEGEND>
<MULTIPLIER> 1,000

<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-START>                             JAN-01-2000
<PERIOD-END>                               MAR-31-2000
<CASH>                                           8,146
<SECURITIES>                                         0
<RECEIVABLES>                                    9,691
<ALLOWANCES>                                         0<F1>
<INVENTORY>                                          0<F1>
<CURRENT-ASSETS>                                17,898
<PP&E>                                         544,807
<DEPRECIATION>                                 146,856
<TOTAL-ASSETS>                                 610,688
<CURRENT-LIABILITIES>                           15,849
<BONDS>                                        502,000
                                0
                                      2,984
<COMMON>                                        77,851
<OTHER-SE>                                         119
<TOTAL-LIABILITY-AND-EQUITY>                   610,688
<SALES>                                          5,792
<TOTAL-REVENUES>                                22,800
<CGS>                                            1,072
<TOTAL-COSTS>                                    9,556
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              11,380
<INCOME-PRETAX>                                  1,936
<INCOME-TAX>                                       (3)
<INCOME-CONTINUING>                              1,939
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     1,939
<EPS-BASIC>                                     (0.05)<F2>
<EPS-DILUTED>                                   (0.05)<F2>
<FN>
<F1>Not separately identified in the consolidated financial statements or
accompanying notes thereto.
<F2>Represents basic and diluted net loss per unit allocated to limited partners.
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</TABLE>


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