LEVIATHAN GAS PIPELINE PARTNERS L P
S-4/A, 1999-08-27
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>   1


PROSPECTUS


AUGUST 27, 1999


                     LEVIATHAN GAS PIPELINE PARTNERS, L.P.
                         LEVIATHAN FINANCE CORPORATION
                                  $175,000,000

                       OFFER TO EXCHANGE ALL OUTSTANDING
              10 3/8% SERIES A SENIOR SUBORDINATED NOTES DUE 2009

                                      FOR

              10 3/8% SERIES B SENIOR SUBORDINATED NOTES DUE 2009
           THAT HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933


     We are offering to exchange all of our outstanding 10 3/8% Series A Senior
Subordinated Notes due 2009 for our registered 10 3/8% Series B Senior
Subordinated Notes due 2009. The Series A notes were issued on May 27, 1999. The
terms of the Series B notes are substantially identical to the terms of the
Series A notes, except that we have registered the Series B notes with the
Securities and Exchange Commission. Because we have registered the Series B
notes, in most circumstances, the Series B notes will not be subject to certain
transfer restrictions and, accordingly, will not be entitled to registration
rights. The Series A notes and Series B notes are collectively referred to in
this prospectus as the "notes."


THE SERIES B NOTES:

     - The Series B notes will mature on June 1, 2009.

     - We will pay interest on the Series B notes semi-annually on June 1 and
       December 1 of each year beginning December 1, 1999 at the rate of 10 3/8%
       per annum.

     - We may redeem the Series B notes at any time after June 1, 2004. Before
       June 1, 2002, we may redeem up to 33% of the notes with the proceeds of
       offerings of our equity. If we sell certain assets and do not reinvest
       the proceeds or repay senior indebtedness or if we experience specific
       kinds of changes of control, we must offer to purchase the notes.

     - If we cannot make payments on the Series B notes when due, our guarantor
       subsidiaries, if any, must make them instead. Not all of our future
       subsidiaries will become guarantors of the notes.

     - The Series B notes are unsecured obligations and subordinated to all of
       our and our guarantor subsidiaries' current indebtedness (other than
       trade payables) and future indebtedness (other than trade payables),
       unless the terms of that indebtedness expressly provide otherwise.

THE EXCHANGE OFFER:

     - Subject to certain customary conditions, which we may waive, the exchange
       offer is not conditioned upon a minimum aggregate principal amount of
       Series A notes being tendered.


     - Our offer to exchange Series A notes for Series B notes will be open
       until 5:00 p.m., New York City time, on September 27, 1999, unless we
       extend the expiration date.



     - You should also carefully review the procedures for tendering the Series
       A notes beginning on page 82 of this prospectus.


     - You may withdraw your tenders of Series A notes at any time prior to the
       expiration of the exchange offer, unless we have already accepted your
       Series A notes for exchange.

     - If you fail to tender your Series A notes, you will continue to hold
       unregistered securities and your ability to transfer them could be
       adversely affected.

     - The exchange of Series A notes for Series B notes in the exchange offer
       will not be a taxable event for U.S. federal income tax purposes.


     YOU SHOULD CAREFULLY CONSIDER THE RISK FACTORS BEGINNING ON PAGE 14 OF THIS
PROSPECTUS BEFORE PARTICIPATING IN THE EXCHANGE OFFER.


     NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED THESE SECURITIES OR PASSED UPON THE
ADEQUACY OR ACCURACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.


                 THE DATE OF THIS PROSPECTUS IS AUGUST 27, 1999

<PAGE>   2

                                 LEVIATHAN MAP
<PAGE>   3

                               TABLE OF CONTENTS


<TABLE>
<CAPTION>
                                        PAGE
                                        ----
<S>                                     <C>
Forward-Looking Statements............   ii
Where You Can Find More Information...   ii
Prospectus Summary....................    1
Risk Factors..........................   14
The Transactions......................   26
Use of Proceeds.......................   27
Capitalization........................   28
Selected Historical Consolidated
  Financial Data......................   29
Management's Discussion and Analysis
  of Financial Condition and Results
  of Operations.......................   31
Business..............................   44
Management............................   69
</TABLE>



<TABLE>
<CAPTION>
                                        PAGE
                                        ----
<S>                                     <C>
Certain Relationships and Related
  Transactions........................   76
Principal Unitholders.................   78
The Exchange Offer....................   79
Description of Notes..................   88
Series A Notes Registration Rights....  131
Description of Other Indebtedness.....  133
The Partnership Agreement.............  136
Certain United States Federal Income
  Tax Considerations..................  141
Plan of Distribution..................  142
Legal Matters.........................  143
Experts...............................  143
Index to Financial Statements.........  F-1
</TABLE>


     You may not transfer or resell the Series B notes except as permitted under
the Securities Act of 1933 and applicable state securities laws.

     The information contained in this prospectus was obtained from us and other
sources believed by us to be reliable.

     You should rely only on the information contained in this document or any
supplement and any information incorporated by reference in this document or any
supplement. We have not authorized anyone to provide you with any information
that is different. If you receive any unauthorized information, you must not
rely on it. You should disregard anything we said in an earlier document that is
inconsistent with what is in our prospectus.

     You should not assume that the information in this document or any
supplement or the information incorporated by reference in this document or any
supplement is current as of any date other than the date on the front page of
this prospectus. This document is not an offer to sell nor is it seeking an
offer to buy these securities in any state or jurisdiction where the offer or
sale is not permitted.

     NOTICE TO NEW HAMPSHIRE RESIDENTS: Neither the fact that a registration
statement or an application for a license has been filed under RSA 421-B with
the state of New Hampshire nor the fact that a security is effectively
registered or a person is licensed in the state of New Hampshire constitutes a
finding by the secretary of state that any document filed under RSA 421-B is
true, complete and not misleading. Neither any such fact nor the fact that any
exemption or exception is available for a security or a transaction means that
the Secretary of State of New Hampshire has passed in any way upon the merits or
qualifications of, or recommended or given approval to, any person, security or
transaction. It is unlawful to make, or cause to be made, to any prospective
purchaser, customer or client, any representation inconsistent with the
provisions of this paragraph.

                                        i
<PAGE>   4

                           FORWARD-LOOKING STATEMENTS

     This prospectus includes and incorporates by reference forward-looking
statements within the meaning of the Private Securities Litigation Reform Act of
1995. These statements relate to analyses and other information which are based
on forecasts of future results and estimates of amounts not yet determinable.
These statements also relate to our future prospects, developments and business
strategies.

     These forward-looking statements are identified by their use of terms and
phrases such as "anticipate," "believe," "could," "estimate," "expect,"
"intend," "may," "plan," "predict," "project," "will," and similar terms and
phrases, including references to assumptions. These statements are contained in
the sections entitled "Prospectus Summary," "Risk Factors," "Management's
Discussion and Analysis of Financial Condition and Results of Operations,"
"Business" and other sections of this prospectus and in the documents
incorporated by reference in this prospectus.

     These forward-looking statements involve risks and uncertainties that may
cause our actual future activities and results of operations to be materially
different from those suggested or described in this prospectus. These risks
include the risks that are identified in this prospectus, which are primarily
listed in the "Risk Factors" and "Management's Discussion and Analysis of
Financial Condition and Results of Operations" sections. These risks are also
specifically described in our Annual Report on Form 10-K and Quarterly Reports
on Form 10-Q. We undertake no obligation to publicly update or revise any
forward-looking statements, whether as a result of new information, future or
otherwise. If one or more of these risks or uncertainties materialize, or if
underlying assumptions prove incorrect, our actual results may vary materially
from those expected, estimated or projected.

                      WHERE YOU CAN FIND MORE INFORMATION

     We file annual, quarterly and special reports, proxy statements and other
information with the Securities Exchange Commission under the Securities
Exchange Act of 1934. You may read and copy any reports, statements or other
information filed by us at the SEC's public reference room at Room 1024,
Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549. Please call the
SEC at 1-800-SEC-0330 for further information on the public reference room. Our
filings with the SEC are also available to the public from commercial document
retrieval services and at the SEC's web site at http://www.sec.gov.

     We most recently have filed with the SEC the following documents:

     - Annual Report on Form 10-K for the year ended December 31, 1998;

     - Quarterly Report on Form 10-Q for the quarter ended March 31, 1999;


     - Quarterly Report on Form 10-Q for the quarter ended June 30, 1999;


     - Proxy Statement dated February 8, 1999 for Special Meeting of Unitholders
       held on March 5, 1999;


     - Current Report on Form 8-K dated June 11, 1999; and



     - Current Report on Form 8-K dated July 15, 1999, including amendments.


     You may request a copy of any of these filings, at no cost, by writing or
telephoning us at the following address or phone number:

        Leviathan Gas Pipeline Partners, L.P.
        El Paso Energy Building

        1001 Louisiana Street, 26th Floor

        Houston, Texas 77002
        (713) 420-2131
        Attention: Investor Relations

                                       ii
<PAGE>   5

                               PROSPECTUS SUMMARY


     This prospectus summary highlights some basic information from this
prospectus to help you understand the exchange offer, including the terms of the
Series B notes. It likely does not contain all the information that is important
to you. You should carefully read this prospectus to understand fully the terms
of the exchange offer (including the Series B notes), as well as the tax and
other considerations that are important to you in making your investment
decision. You should pay special attention to the "Risk Factors" section
beginning on page 14 of this prospectus to determine whether the exchange offer
and an investment in the Series B notes is appropriate for you. For purposes of
this prospectus, unless the context otherwise indicates, when we refer to "us,"
"we," "our," "ours," "Leviathan" or the "partnership," we are describing
ourselves, Leviathan Gas Pipeline Partners, L.P., together with our
subsidiaries, including Leviathan Finance Corporation. In this prospectus, the
term "Series A notes" refers to the 10 3/8% Series A Senior Subordinated Notes
due 2009 that were issued on May 27, 1999. The term "Series B notes" refers to
the 10 3/8% Series B Senior Subordinated Notes due 2009 that will be issued in
the exchange offer.


                               THE EXCHANGE OFFER


     On May 27, 1999, we completed the private offering of $175.0 million of
10 3/8% Series A Senior Subordinated Notes due 2009. We entered into a
registration rights agreement with the initial purchasers in the private
offering of the Series A notes in which we agreed, among other things, to
deliver to you this prospectus and to complete this exchange offer within 180
days of the original issuance of the Series A notes. You are entitled to
exchange in this exchange offer Series A notes that you hold for registered
Series B notes with substantially identical terms. You should read the
discussion under the headings "Summary of the Terms of the Exchange Offer"
beginning on page 7, "Summary of the Terms of the Series B Notes" beginning on
page 10, "The Exchange Offer" beginning on page 79 and "Description of Notes"
beginning on page 88 for further information regarding the exchange offer and
the Series B notes.



     We believe that the Series B notes that will be issued in this exchange
offer may be resold by you without compliance with the registration and
prospectus delivery provisions of the Securities Act, subject to certain
conditions.


                                  THE COMPANY


     We are Leviathan Gas Pipeline Partners, L.P., a Delaware master limited
partnership which commenced operations in 1989 (through a predecessor company)
and is listed on the New York Stock Exchange (NYSE: LEV). We are a provider of
integrated energy services, including natural gas and oil gathering,
transportation, midstream and other related services in the Gulf of Mexico.
Either directly or through joint ventures, we own interests in nine operating
pipeline systems, which extend approximately 1,500 miles and have a design
capacity of 6.8 Bcf of natural gas and 400.0 Mbbls of oil per day. We also own
interests in multi-purpose platforms; production handling, dehydration and other
energy-related infrastructure facilities; as well as oil and natural gas
properties. During 1998, on a pro forma basis after giving effect to the
offering of the notes and the transactions described under the caption "The
Transactions" in this prospectus, we had total revenues of $100.4 million and
consolidated cash flow of $76.3 million, which includes non-recurring reductions
estimated to total approximately $13.3 million associated with the termination
of a compensation plan ($4.5 million) and curtailment of oil and natural gas
production at our Viosca Knoll Block 817 (estimated to be $8.8 million).
Excluding such reductions, consolidated cash flow would have been $89.6 million.
During the six months ended June 30, 1999, on a pro forma basis, we had total
revenues of $56.3 million and consolidated cash flow of $47.8 million.


     Leviathan Gas Pipeline Company, our sole general partner, is a wholly owned
indirect subsidiary of El Paso Energy Corporation (NYSE: EPG). El Paso Energy is
a diversified energy holding company engaged, through its subsidiaries, in the
interstate and intrastate transportation, gathering and processing of natural
gas; the marketing of natural gas, power and other energy-related commodities;
power generation; and the development and operation of energy infrastructure
facilities worldwide. In 1998, El Paso Energy

                                        1
<PAGE>   6

paid approximately $422.0 million to acquire an effective 27.3% interest in us,
including all of the general partner interests. In addition, in June 1999, El
Paso Energy contributed to us a 49.0% interest in Viosca Knoll Gathering Company
in exchange for $19.9 million in cash and $59.8 million in common units. The
Viosca Knoll transaction increased El Paso Energy's effective ownership interest
in us to 34.5% and is consistent with El Paso Energy's strategy to use us as its
primary growth vehicle for future offshore gathering and transportation
activities in the Gulf.


     We have substantial assets in the Gulf, predominantly offshore Louisiana
and Mississippi, which we believe are well-situated to maintain a stable base of
operations and to provide growth opportunities by successfully competing for new
production in our areas of service, especially those assets in the Deepwater
(water depths greater than 1,500 feet), Flextrend (water depths of 600 to 1,500
feet) and subsalt regions. Either directly or through joint ventures, we own
interests in:


     - eight existing and one planned natural gas pipeline systems;

     - an oil pipeline system;

     - six strategically-located, multi-purpose platforms;

     - production handling and dehydration facilities;

     - four producing oil and natural gas properties; and

     - a non-producing oil and natural gas property.


     In addition, we have recently completed the construction of a wholly owned
oil pipeline which we expect to become operational in the fourth quarter of 1999
and, with our joint venture partners, we are constructing two natural gas
gathering systems.


     In addition to our wholly owned assets and operations, we conduct a large
portion of our business through joint ventures/strategic alliances, which we
believe are ideally suited for Deepwater operations. We use joint ventures to
reduce our capital requirements and risk exposure to individual projects, as
well as to develop strategic relationships, realize synergies resulting from
combining resources, and benefit from the assets, experience and resources of
our partners. Generally, our partners are integrated or very large independent
energy companies with substantial interests, operations and assets in the Gulf,
including Coastal/ANR, KN Energy/NGPL, Marathon, Shell and Texaco.

     Through our strategically-located network of wholly owned and joint venture
pipelines and other facilities and businesses, we believe we provide customers
with an efficient and cost effective midstream alternative. Today, we offer some
customers a unique single point of contact through which they may access a wide
range of integrated or independent midstream services, including gathering,
transportation, production handling, dehydration and other services. We also
provide producers operating in certain Deepwater and Flextrend areas with
relatively low-cost access to numerous onshore long-haul pipelines and,
accordingly, multiple end-use markets. Additionally, our specialized Deepwater
experience and expertise allows us to provide economic operational solutions to
producers' other offshore needs.

     We plan to focus our Gulf operations on the high profit potential
Deepwater, Flextrend and subsalt regions. Our pipeline and infrastructure
network currently extends from the shoreline, through the Flextrend and up to
and, in some areas, into the Deepwater. The location of some of our facilities
in relation to properties currently being developed, as well as to the onshore
long-haul pipelines which producers need in order to access the most attractive
markets, should provide us with an economic advantage over some of our
competitors. We believe more extensive Deepwater operations will permit us to
enhance our financial stability and growth for many reasons, including the
substantial reserves associated with Deepwater fields and the large capital
commitments and longer-term view required by producers developing these regions.
Accordingly, we believe that Deepwater projects are less sensitive to near-term
hydrocarbon price cycles.

     We formed Leviathan Finance Corporation for the sole purpose of co-issuing
the notes described in this prospectus. Leviathan Finance has no material assets
or operations.

                                        2
<PAGE>   7

                               INDUSTRY OVERVIEW


     We believe that development and exploration activity in the Gulf will
continue and that the Gulf will continue to be one of the most prolific
producing regions in the U.S. Today, the Gulf accounts for approximately 20.3%
and 25.6% of total U.S. production of oil and natural gas, respectively. Oil
production from the Gulf is expected to increase from 1.3 MMbbls/d in 1998 to
1.8 MMbbls/d in 2003, according to industry sources. Production of natural gas
is also expected to increase from 14.0 Bcf/d in 1998 to 16.6 Bcf/d in 2003. The
principal source of this production growth is expected to be the Flextrend and
Deepwater. Recent developments in oil and natural gas exploration and production
techniques, such as 3-D seismic analysis, horizontal drilling, remote subsea
completions via satellite templates and sea floor wellheads, and non-stationary
surface production facilities, have substantially reduced finding, development
and production costs, allowing operators to move into the Deepwater regions of
the Gulf. By year-end 2003, production from deeper water fields is projected to
account for 54.6% and 24.0% of the Gulf's oil and natural gas production, up
from 35.6% and 13.4% in 1998.


     We have pipelines, platforms and other infrastructure facilities
strategically positioned throughout a large portion of the Flextrend area of the
Gulf, offshore Louisiana and Mississippi and extending out to and, in some
cases, into the Deepwater. Because of their location in relation to the way in
which oil and natural gas development has occurred in the Gulf, we expect these
assets to contribute significantly to the development of natural gas and oil in
surrounding areas of the Flextrend and Deepwater. Historically, development of
nascent Gulf regions has started with large pipelines positioned in a
north/south direction connecting new, significant discoveries to existing
shoreward infrastructure. Then, additional infrastructure has expanded laterally
in an east/west direction to access reserves between the north/south pipelines.
As additional infrastructure continues to be developed, previously uneconomic or
less economic discoveries often become economic or more economic by sharing
common facilities and the related costs. Along with the advances in exploration
and development technology, we expect this process of lateral expansion, which
has been continually repeated in the Gulf, to result in a continued and more
complete development of the Flextrend and a more accelerated development of the
Deepwater. Numerous major Deepwater discoveries have been announced by Unocal,
Shell and other integrated or very large independent energy companies in recent
years and such reserves are currently being developed. Recently, Unocal
announced that its Mad Dog prospect, located offshore Louisiana in 6,700 feet of
water and estimated to contain 400.0 MMbbls to 800.0 MMbbls of oil, could be the
largest field ever discovered in the Gulf.

                               BUSINESS STRATEGY

     Our business objective is to maintain and enhance our position as a
provider of integrated energy services, to continue to enhance the quality of
our cash flow, earnings and other financial results of operations and to provide
additional growth opportunities by pursuing the following strategies:

     - focus on high potential Deepwater operations, leveraging our existing
       assets and Deepwater knowledge and expertise;

     - provide independent, multiple market access for the Deepwater, Flextrend
       and subsalt regions of the Gulf;

     - offer a single source alternative for a complete range of midstream
       services;

     - diversify our portfolio with respect to geography, projects, customers
       and services;

     - share capital costs and risks through joint ventures/strategic alliances,
       principally with partners with substantial financial resources and
       strategic interests, assets and operations in the Gulf, especially in the
       Deepwater, Flextrend and subsalt regions;

     - design new infrastructure projects based on long-term commitments of
       dedicated production and/or fixed payments, with the ability to expand
       capacity and service in the future to capture potential growth
       opportunities; and

     - selectively invest in oil and natural gas properties associated with
       infrastructure opportunities.

                                        3
<PAGE>   8

                              RECENT DEVELOPMENTS

ALLEGHENY OIL PIPELINE


     We recently completed construction of the Allegheny oil pipeline, a 100%
owned crude oil pipeline which is 14 inches in diameter and 40 miles in length
and which will connect the Allegheny Field in the Green Canyon area of the Gulf
with the Poseidon oil pipeline at Ship Shoal Block 332. This new pipeline, which
will have a daily capacity of more than 80.0 Mbbls/d, is scheduled to begin
operating in the fourth quarter of 1999. We estimate the construction costs for
the Allegheny oil pipeline to total approximately $29.0 million, $12.3 million
of which was incurred prior to the offering of the Series A notes.



EWING BANK 958 UNIT



     We believe our Ewing Bank 958 Unit development project, formerly known as
the Sunday Silence Property, provides us with an opportunity to apply to the
Deepwater area several strategies we have successfully implemented in the
shallow and Flextrend areas. Similar to three other oil and natural gas
properties we have developed, this project is associated with other independent
infrastructure opportunities. Although the Ewing Bank 958 Unit development is a
stand-alone project, we expect it to position us to play a significant role in
the extension of pipeline, platform and other infrastructure facilities and
service opportunities in this potential emerging Deepwater region. Currently, we
anticipate building gathering extensions off of our Poseidon oil pipeline joint
venture and our Manta Ray Offshore Gathering natural gas pipeline joint venture.



     Pursuant to our current plan of development for the Ewing Bank 958 Unit, we
are constructing a Moses Tension Leg Platform from which we would conduct all
activities related to that development, including additional drilling,
maintenance, and separation and handling operations. This platform is designed
for use in water depths of up to 6,000 feet and will have production handling
facilities with a throughput design capacity of 55.0 million cubic feet of
natural gas per day and 25,000 barrels of oil per day.



     To date there has been no production from the Ewing Bank 958 Unit. We
currently own a 100% working interest in our Ewing Bank 958 Unit, which we
purchased in October 1998 from a wholly owned, indirect subsidiary of El Paso
Energy for $12.2 million. In addition to the initial discovery well drilled in
1994 and the two delineation wells drilled in 1994 and 1998, the Ewing Bank 958
Unit development program may require drilling up to five additional wells,
depending on the level of actual production and other factors. As with many of
our strategic assets, we continually evaluate various alternatives for the Ewing
Bank 958 Unit and the related infrastructure to optimize the amount and quality
of our cash flow. Given the size and nature of this project and the various
strategic arrangements that might be available with a producer or another
industry participant, we believe the Ewing Bank 958 Unit is well suited for a
co-ownership, joint venture or other participatory arrangement. If we do not
consummate such an arrangement, we may need to raise substantial amounts of
additional capital to fund this development project.



NEMO PIPELINE



     On August 10, 1999, we formed Nemo Gathering Company, LLC, a joint venture
owned 66.1% by Tejas Offshore Pipeline, LLC, a subsidiary of Shell Oil Company,
and 33.9% by us, to construct, own and operate a natural gas gathering system.
The Nemo System will deliver natural gas production from the Shell-operated
Brutus and Glider Deepwater development properties to another of our joint
venture pipelines, the Manta Ray Offshore Gathering System. We expect the Nemo
System to be placed in service in late 2001 at a total cost of approximately
$36.0 million.


                                THE TRANSACTIONS


UTOS/HIOS/EAST BREAKS ACQUISITION



     On June 30, 1999, we acquired 100.0% ownership of two companies from
Natural Gas Pipeline Company of America, a subsidiary of KN Energy, Inc., for
total consideration of approximately $51.0 million, which companies own a 20.0%
membership interest in Western Gulf Holdings, L.L.C.


                                        4
<PAGE>   9

(which owns 100.0% of both High Island Offshore System, L.L.C. and East Breaks
Gathering Company, L.L.C.) and a 33.3% partnership interest in U-T Offshore
System. As a result, we now own 66.7% of UTOS and 60.0% of Western Gulf (and,
thus, 60.0% of each of HIOS and East Breaks).

LEVIATHAN CREDIT FACILITY


     Concurrently with the closing of the offering of the Series A notes, we
amended our $375.0 million revolving credit facility to, among other things,
extend the maturity from December 1999 to May 2002. As of August 9, 1999, we had
$300.0 million outstanding under the revolving credit facility bearing interest
at an average floating rate of 7.7% per annum. See "Description of Other
Indebtedness -- Leviathan Credit Facility."


VIOSCA KNOLL TRANSACTION

     Unitholders attending (in person or by proxy) our March 5, 1999 meeting
overwhelmingly approved the Viosca Knoll transaction discussed in this
prospectus. On June 1, 1999, after the closing of the offering of the Series A
notes, we closed our acquisition of an additional 49.0% interest in Viosca Knoll
Gathering Company from a subsidiary of El Paso Energy, which resulted in us
owning 99.0% of Viosca Knoll with an option to purchase the remaining 1.0%. We
paid El Paso Energy $79.7 million for the 49.0% interest, comprised of $19.9
million in cash and $59.8 million in common units.

     Following the closing of the Viosca Knoll transaction, El Paso Energy's
effective ownership interest in us is 34.5%. In addition, at the closing of the
Viosca Knoll transaction, El Paso Energy contributed approximately $33.4 million
in cash to Viosca Knoll, which equalled 50.0% of the principal amount
outstanding under Viosca Knoll's credit facility, and we thereafter repaid and
terminated that credit facility.

                                        5
<PAGE>   10

                     STRUCTURE AND MANAGEMENT OF LEVIATHAN


     Leviathan Gas Pipeline Company, our sole general partner and an indirect
wholly owned subsidiary of El Paso Energy, manages our activities and conducts
our business. We and the general partner utilize the employees of, and
management services provided by, El Paso Energy and its affiliates under a
management agreement. The following chart depicts the ownership structure of
Leviathan and certain of its affiliates after giving effect to the transactions
described in this prospectus.


                                    [CHART]


<TABLE>
<CAPTION>
                           OWNERSHIP
                           ---------
<S>                        <C>
- -Green Canyon               100.0%
- -Tarpon                     100.0%
- -Viosca Knoll                99.0% (3)
- -UTOS                        66.7%
- -HIOS                        60.0%
- -East Breaks                 60.0%
- -Stingray                    50.0%
- -Nemo                        33.9%
- -Manta Ray Offshore          25.7%
- -Nautilus                    25.7%
- -Allegheny                  100.0%
- -Poseidon                    36.0%
</TABLE>


<TABLE>
<CAPTION>
                           OWNERSHIP
                           ---------
<S>                        <C>
- -Viosca Knoll Block 817     100.0%
- -East Cameron Block 373     100.0%
- -Ship Shoal Block 332       100.0%
- -South Timbalier Block
  292                       100.0%
- -Ship Shoal Block 331       100.0%
- -Garden Banks Block 72       50.0%
- -West Cameron Dehy           50.0%
</TABLE>

<TABLE>
<CAPTION>
                           OWNERSHIP
                           ---------
<S>                        <C>
- -Viosca Knoll Block 817     100.0%
- -Ewing Bank 958 Unit        100.0%
- -Garden Banks Block 72       50.0%
- -Garden Banks Block 117      50.0%
- -West Delta Block 35         38.0%
</TABLE>

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

(1) Leviathan Gas Pipeline Company, an indirect wholly owned subsidiary of El
    Paso Energy, is our general partner. El Paso Energy's 34.5% effective
    interest in Leviathan includes a 1.0% general partner interest, a 32.5%
    limited partner interest comprised of approximately 9.0 million common
    units, and a 1.0% nonmanaging interest in substantially all of Leviathan's
    subsidiaries. The interest acquired in connection with the Viosca Knoll
    transaction is held by other El Paso Energy subsidiaries.

(2) Leviathan Finance, not shown in this ownership structure chart, was formed
    for the sole purpose of co-issuing the notes described herein. Leviathan
    Finance has no material assets or operations.


(3) Does not reflect the 1.0% interest in Viosca Knoll held by El Paso Energy.
    We have an option to acquire this remaining 1.0% from El Paso Energy,
    exercisable after June 1, 2000.


                                        6
<PAGE>   11

                   SUMMARY OF THE TERMS OF THE EXCHANGE OFFER


SECURITIES TO BE
EXCHANGED..................  On May 27, 1999, we issued $175.0 million aggregate
                             principal amount of Series A notes to the initial
                             purchasers in a transaction exempt from the
                             registration requirements of the Securities Act of
                             1933, as amended (the "Securities Act"). The terms
                             of the Series B notes and the Series A notes are
                             substantially the same in all material respects,
                             except that the Series B notes will be freely
                             transferable by the holders except as otherwise
                             provided in this prospectus. See "The Exchange
                             Offer" beginning on page 79 and "Description of
                             Notes" beginning on page 88 of this prospectus.


THE EXCHANGE OFFER.........  We are offering to exchange up to $175.0 million
                             principal amount of the Series B notes for up to
                             $175.0 million principal amount of the Series A
                             notes. As of the date of this prospectus, Series A
                             notes representing $175.0 million aggregate
                             principal amount are outstanding. The Series B
                             notes will evidence the same debt as the Series A
                             notes, and the Series A notes and the Series B
                             notes will be governed by the same indenture.


                             The Series B notes are described in detail under
                             the heading "Description of Notes" beginning on
                             page 88 of this prospectus.



RESALE.....................  We believe that you will be able to freely transfer
                             the Series B notes without registration or any
                             prospectus delivery requirement; however, in
                             connection with a resale of any of their Series B
                             notes, certain broker-dealers may be required to
                             deliver copies of this prospectus and certain of
                             our affiliates may have registration and prospectus
                             delivery requirements.



EXPIRATION DATE............  The exchange offer will expire at 5:00 p.m., New
                             York City time, September 27, 1999 or a later date
                             and time if we extend it (the "expiration date").



WITHDRAWAL.................  You may withdraw the tender of any Series A notes
                             pursuant to the exchange offer at any time prior to
                             the expiration date. We will return, as promptly as
                             practicable after the expiration or termination of
                             the exchange offer, any Series A notes not accepted
                             for exchange for any reason without expense to you.


INTEREST ON THE SERIES B
NOTES AND THE SERIES A
  NOTES....................  Interest on the Series B notes will accrue from the
                             date of the original issuance of the Series A notes
                             or from the date of the last payment of interest on
                             the Series A notes, whichever is later. No
                             additional interest will be paid on Series A notes
                             tendered and accepted for exchange.


CONDITIONS TO THE EXCHANGE
  OFFER....................  The exchange offer is subject to certain customary
                             conditions, certain of which may be waived by us.
                             See "The Exchange Offer -- Conditions of the
                             Exchange Offer" beginning on page 85 of this
                             prospectus.


                                        7
<PAGE>   12

PROCEDURES FOR TENDERING
  SERIES A NOTES...........  If you wish to accept the exchange offer, you must
                             complete, sign and date the accompanying letter of
                             transmittal in accordance with the instructions in
                             the letter of transmittal, and deliver the letter
                             of transmittal, along with the Series A notes and
                             any other required documentation, to the exchange
                             agent. By executing the letter of transmittal, you
                             will represent to us that, among other things:

                             - any Series B notes you receive will be acquired
                               in the ordinary course of business,

                             - you have no arrangement with any person to
                               participate in the distribution of the Series B
                               notes, and

                             - you are not an affiliate of ours or, if you are
                               an affiliate, you will comply with the
                               registration and prospectus delivery requirements
                               of the Securities Act to the extent applicable.


                             - if you are a broker-dealer who is receiving
                               Series B notes in exchange for Series A notes
                               that you acquired as a result of market-making or
                               other trading activities, you will comply with
                               the registration and prospectus delivery
                               requirements of the Securities Act to the extent
                               applicable.


                             If you hold your Series A notes through the
                             Depository Trust Company ("DTC") and wish to
                             participate in the exchange offer, you may do so
                             through the DTC's Automated Tender Offer Program.
                             By participating in the exchange offer, you will
                             agree to be bound by the letter of transmittal as
                             though you had executed such letter of transmittal.


                             We will accept for exchange any and all Series A
                             notes which are properly tendered (and not
                             withdrawn) in the exchange offer prior to the
                             Expiration Date. The Series B notes issued pursuant
                             to the exchange offer will be delivered promptly
                             following the Expiration Date. See "The Exchange
                             Offer -- Acceptance of Series A Notes for Exchange"
                             beginning on page 81 of this prospectus.


EFFECT OF NOT TENDERING....  Series A notes that are not tendered or that are
                             tendered but not accepted will, following the
                             completion of the exchange offer, continue to be
                             subject to the existing restrictions upon transfer
                             thereof. We will have no further obligation to
                             provide for the registration under the Securities
                             Act of such Series A notes.

SPECIAL PROCEDURES FOR
BENEFICIAL OWNERS..........  If you are a beneficial owner whose Series A notes
                             are registered in the name of a broker, dealer,
                             commercial bank, trust company or other nominee and
                             wish to tender such Series A notes in the exchange
                             offer, please contact the registered holder as soon
                             as possible and instruct them to tender on your
                             behalf and comply with our instructions set forth
                             elsewhere in this prospectus.

GUARANTEED DELIVERY
  PROCEDURES...............  If you wish to tender your Series A notes, you may,
                             in certain instances, do so according to the
                             guaranteed delivery procedures set forth elsewhere
                             in this prospectus under "The Exchange Offer --

                                        8
<PAGE>   13


                             Procedures for Tendering Series A
                             Notes -- Guaranteed Delivery" beginning on page 82
                             of this prospectus.



REGISTRATION RIGHTS
AGREEMENT..................  We sold the Series A notes on May 27, 1999, to the
                             initial purchasers in a private placement in
                             reliance on Rule 144A and Regulation S under the
                             Securities Act. In connection with the sale, we
                             entered into a registration rights agreement with
                             the initial purchasers which grants the holders of
                             the Series A notes certain exchange and
                             registration rights. Except to the extent a holder
                             of the notes is an initial purchaser or a
                             broker-dealer that acquired the Series A notes in a
                             market-making or other trading transaction and has
                             provided us with timely notice, this exchange offer
                             satisfies those rights, which terminate upon
                             consummation of the exchange offer. You will not be
                             entitled to any exchange or registration rights
                             with respect to the Series B notes. For additional
                             information see "Series A Notes Registration
                             Rights" beginning on page 131 of this prospectus.



CERTAIN FEDERAL INCOME TAX
  CONSIDERATIONS...........  We believe the exchange of Series A notes for
                             Series B notes pursuant to the exchange offer will
                             not constitute a sale or an exchange for federal
                             income tax purposes. See "Certain United States
                             Federal Income Tax Considerations" beginning on
                             page 141 of this prospectus.


USE OF PROCEEDS............  We will not receive any proceeds from the exchange
                             of notes pursuant to the exchange offer.


EXCHANGE AGENT.............  We have appointed Chase Bank of Texas, N.A. as the
                             exchange agent for the exchange offer. The mailing
                             address and telephone number of the exchange agent
                             are Chase Bank of Texas, N.A., Corporate Trust
                             Operations, Attn: Frank Ivins, P.O. Box 2320,
                             Dallas, Texas 75221-2320, telephone 1-800-275-2048.
                             See "The Exchange Offer -- Exchange Agent"
                             beginning on page 87 of this prospectus.


                                        9
<PAGE>   14

                   SUMMARY OF THE TERMS OF THE SERIES B NOTES


     The form and terms of the Series B notes are substantially the same as the
form and terms of the Series A notes, except that the Series B notes are
registered under the Securities Act. As a result, the holders of Series B notes
(other than certain broker-dealers) will not have registration rights and
liquidated damages rights similar to holders of the Series A notes. Except to
the extent held by certain broker-dealers, the Series B notes will not bear
legends restricting their transfer.


THE ISSUERS................  Leviathan Gas Pipeline Partners, L.P. and Leviathan
                             Finance Corporation.

SECURITIES OFFERED.........  $175.0 million aggregate principal amount of
                             10 3/8% Series B Senior Subordinated Notes due
                             2009.

MATURITY DATE..............  June 1, 2009.

INTEREST PAYMENT DATES.....  June 1 and December 1 of each year, beginning
                             December 1, 1999.


OPTIONAL REDEMPTION........  On or after June 1, 2004, we may redeem some or all
                             of the notes at any time at the redemption prices
                             listed in the section "Description of
                             Notes -- Optional Redemption" on page 92 of this
                             prospectus.



                             Before June 1, 2002, we may redeem up to 33% of the
                             original principal amount of the notes with the
                             proceeds of equity offerings by us at the price
                             listed in the section "Description of
                             Notes -- Optional Redemption" on page 92 of this
                             prospectus, provided that at least 67% of the
                             original issue remains outstanding.



MANDATORY OFFER TO
REPURCHASE.................  If we sell certain assets and do not reinvest the
                             proceeds or repay senior indebtedness or if we
                             experience specific kinds of changes of control, we
                             must offer to repurchase the notes at the prices
                             listed in the section "Description of
                             Notes -- Repurchase at the Option of Holders" on
                             page 93 of this prospectus.



SUBSIDIARY GUARANTEES......  Each of our existing subsidiaries will guarantee
                             the notes initially and so long as such subsidiary
                             guarantees our senior debt. Not all of our future
                             subsidiaries will have to become a guarantor. If we
                             cannot make payments on the notes when they are
                             due, the guarantor subsidiaries, if any, must make
                             them instead. See "Description of Notes -- The
                             Guarantees" on page 91 of this prospectus.



RANKING....................  The notes and subsidiary guarantees are senior
                             subordinated indebtedness. They rank behind all of
                             our and our guarantor subsidiaries' current and
                             future indebtedness (other than trade payables and
                             certain other liabilities), except indebtedness
                             that expressly provides that it is not senior to
                             these notes and the subsidiary guarantees. See
                             "Description of Notes -- Subordination" on page 90
                             of this prospectus.



                             Assuming we had completed the exchange offering of
                             the Series B notes on August 9, 1999, the notes
                             (including the Series B notes) and the subsidiary
                             guarantees:



                               - would have been subordinated to $300.0 million
                                 of senior indebtedness;


                               - would have ranked equally with all other
                                 liabilities and trade debt of Leviathan or any
                                 subsidiary which is a subsidiary guarantor; and

                                       10
<PAGE>   15

                               - would have ranked senior to all junior
                                 subordinated indebtedness, of which there was
                                 none.

CERTAIN COVENANTS..........  We will issue the Series B notes, and we issued the
                             Series A notes, under an indenture with Chase Bank
                             of Texas, National Association, as trustee. The
                             indenture will, among other things, restrict our
                             ability and the ability of our subsidiaries to:

                               - borrow money;

                               - pay distributions or dividends on equity or
                                 purchase equity;

                               - make investments;

                               - use assets as security in other transactions;

                               - enter into sale and lease-back transactions;

                               - sell certain assets or merge with or into other
                                 companies;

                               - engage in transactions with affiliates; and

                               - engage in unrelated businesses.


                             For more details, see the heading "Description of
                             Notes -- Certain Covenants" on page 96 of this
                             prospectus.


REGISTERED EXCHANGE OFFER
AND REGISTRATION RIGHTS....  We have agreed to:

                               - file a registration statement within 60 days
                                 after the closing date of the offering of the
                                 Series A notes for an offer to exchange those
                                 notes for debt securities with identical terms
                                 (except for transfer restrictions);

                               - use our best efforts to cause the registration
                                 statement to become effective within 150 days
                                 after the closing date of the offering of the
                                 Series A notes; and

                               - complete the registered exchange offer within
                                 180 days after the closing date of the offering
                                 of the Series A notes.


                             Except to the extent we receive notice from any
                             holder of the notes that is a broker-dealer that
                             acquired the Series A notes in market-making or
                             other trading transactions or is an initial
                             purchaser of the Series A notes, the consummation
                             of this exchange offer satisfies our registration
                             obligations described above.


                                  RISK FACTORS


     You should carefully consider the discussion of risks beginning on page 14
and the other information included in this prospectus prior to exchanging your
Series A notes for Series B notes.


                                       11
<PAGE>   16

                        SUMMARY HISTORICAL AND PRO FORMA
                          CONSOLIDATED FINANCIAL DATA


     The historical financial data for each of the three years ended December
31, 1996, 1997 and 1998, and as of December 31, 1997 and 1998 was derived from
our consolidated financial statements and notes thereto included elsewhere in
this prospectus. The historical financial data as of December 31, 1996 has been
derived from our historical consolidated financial statements (not included
herein). The historical financial data for each of the six months ended June 30,
1998 and 1999 and as of June 30, 1999 was derived from our unaudited
consolidated financial statements and notes thereto included elsewhere in this
prospectus. The historical financial data as of June 30, 1998 has been derived
from our unaudited historical consolidated financial statements (not included
herein). We believe that all material adjustments, consisting only of normal
recurring adjustments necessary for the fair presentation of our interim
results, have been included. Results of operations for any interim period are
not necessarily indicative of the results of operations for the entire year due
to the seasonal nature of our business. The unaudited pro forma consolidated
financial data reflects (1) the issuance of the notes, (2) the consummation of
the Viosca Knoll transaction, (3) the repayment and cancellation of Viosca
Knoll's credit facility, (4) the reduction of our revolving credit facility, (5)
the consummation of the UTOS/HIOS/East Breaks acquisition and (6) the payment of
transaction costs. The unaudited pro forma consolidated financial data is based
on the assumptions described in the notes to the unaudited pro forma
consolidated financial statements located on pages F-3 through F-10 and is not
necessarily indicative of the results of operations that may be achieved in the
future. You should read this information along with "Management's Discussion and
Analysis of Financial Condition and Results of Operations" beginning on page 30,
"Business" beginning on page 44 and the consolidated financial statements and
notes thereto listed on pages F-1 and F-2.



<TABLE>
<CAPTION>
                                                                PRO FORMA          SIX MONTHS
                                 YEAR ENDED DECEMBER 31,        YEAR ENDED       ENDED JUNE 30,         PRO FORMA
                              ------------------------------   DECEMBER 31,    -------------------   SIX MONTHS ENDED
                                1996       1997       1998         1998          1998       1999      JUNE 30, 1999
                              --------   --------   --------   ------------    --------   --------   ----------------
                                                               (UNAUDITED)         (UNAUDITED)         (UNAUDITED)
                                                           (IN THOUSANDS, EXCEPT RATIOS)
<S>                           <C>        <C>        <C>        <C>             <C>        <C>        <C>
STATEMENT OF OPERATIONS:
Oil and natural gas sales...  $ 47,068   $ 58,106   $ 31,411     $ 31,939      $ 15,734   $ 15,100       $ 15,141
Gathering, transportation
  and platform services.....    24,005     17,329     17,320       47,415         7,782     10,798         23,740
Equity in earnings..........    20,434     29,327     26,724       21,048        12,571     19,953         17,404
                              --------   --------   --------     --------      --------   --------       --------
         Total revenue......    91,507    104,762     75,455      100,402        36,087     45,851         56,285
                              --------   --------   --------     --------      --------   --------       --------
Operating expenses..........     9,068     11,352     11,369       14,595         5,546      5,025          6,061
Depreciation, depletion and
  amortization..............    31,731     46,289     29,267       34,797        14,845     13,727         16,315
Impairment, abandonment and
  other.....................        --     21,222     (1,131)      (1,131)           --         --             --
General and administrative
  expenses and management
  fee.......................     8,540     14,661     16,189       16,343         7,503      5,909          5,972
                              --------   --------   --------     --------      --------   --------       --------
         Total operating
           costs............    49,339     93,524     55,694       64,604        27,894     24,661         28,348
                              --------   --------   --------     --------      --------   --------       --------
Operating income............    42,168     11,238     19,761       35,798         8,193     21,190         27,937
Interest income and other...     1,710      1,475        771        1,821           157        268            799
Interest and other financing
  costs.....................    (5,560)   (14,169)   (20,242)     (36,151)       (8,429)   (13,868)       (20,805)
Minority interest in
  (income) loss.............      (427)         7        (15)        (251)           (3)       (80)          (181)
                              --------   --------   --------     --------      --------   --------       --------
Income (loss) before income
  taxes.....................    37,891     (1,449)       275        1,217           (82)     7,510          7,750
Income tax benefit..........       801        311        471          471           168        177            177
                              --------   --------   --------     --------      --------   --------       --------
         Net income
           (loss)...........  $ 38,692   $ (1,138)  $    746     $  1,688      $     86   $  7,687       $  7,927
                              ========   ========   ========     ========      ========   ========       ========
</TABLE>


                                       12
<PAGE>   17


<TABLE>
<CAPTION>
                                                                PRO FORMA          SIX MONTHS
                                 YEAR ENDED DECEMBER 31,        YEAR ENDED       ENDED JUNE 30,         PRO FORMA
                              ------------------------------   DECEMBER 31,    -------------------   SIX MONTHS ENDED
                                1996       1997       1998         1998          1998       1999      JUNE 30, 1999
                              --------   --------   --------   ------------    --------   --------   ----------------
                                                               (UNAUDITED)         (UNAUDITED)         (UNAUDITED)
                                                           (IN THOUSANDS, EXCEPT RATIOS)
<S>                           <C>        <C>        <C>        <C>             <C>        <C>        <C>
OTHER FINANCIAL DATA:

Consolidated cash flow(1)...  $ 91,998   $ 77,846   $ 52,804     $ 76,300(4)   $ 23,922   $ 39,340       $ 47,838
Fixed charges(2)............  $ 17,470   $ 15,890   $ 21,308     $ 37,217      $  8,954   $ 14,623       $ 21,561
Fixed charge coverage
  ratio(3)..................      5.3x       4.9x       2.5x         2.1x          2.7x       2.7x           2.2x
BALANCE SHEET DATA (AT END
  OF PERIOD):
Total assets................  $453,526   $409,842   $442,726           (5)     $406,087   $625,913       $625,913
Total debt..................   227,000    238,000    338,000           (5)      270,000    481,500        481,500
Partners' capital...........   192,023    143,966     82,896           (5)      113,557    120,036        120,036
</TABLE>


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


(1) For purposes of the above presentation, "consolidated cash flow" has been
    calculated in accordance with the Indenture. For the exact definition of
    this term, see "Description of Notes -- Certain Definitions" on page 115 of
    this prospectus. As defined, generally, "consolidated cash flow" means
    Leviathan's consolidated net income, plus (1) cash distributions to
    Leviathan and its restricted subsidiaries from persons other than its
    restricted subsidiaries, (2) extraordinary losses, (3) income tax expense,
    (4) interest and other financing costs, to the extent deducted and
    calculated in consolidated net income, (5) depreciation, depletion and
    amortization and (6) other non-cash expenses, to the extent deducted and
    calculated in consolidated net income, less (7) extraordinary non-cash items
    that increase Leviathan's consolidated net income and (8) earnings
    attributable to persons other than its restricted subsidiaries. Consolidated
    cash flow should not be considered in isolation or as a substitute for net
    income, cash flow or other income or cash flow data prepared in accordance
    with generally accepted accounting principles or as a measure of our
    profitability or liquidity.


(2) "Fixed charges" consist of interest costs (whether expensed or capitalized),
    amortization of debt issue costs and certain pre-tax preferred stock
    dividend requirements of Leviathan and any restricted subsidiary.

(3) "Fixed charge coverage ratio" is calculated as "consolidated cash flow"
    divided by "fixed charges."

(4) Consolidated cash flow on a pro forma basis for the year ended December 31,
    1998 excluding estimated non-recurring reductions totaling approximately
    $13.3 million would have been $82.1 million. The non-recurring reductions
    include (1) approximately $4.5 million of compensation expense related to
    grants under our Unit Appreciation Plan, which was terminated in October
    1998 and replaced with a compensation plan that is not expected to require
    the incurrence of similar compensation expenses, and (2) approximately $8.8
    million related to lower production from our interest in Viosca Knoll Block
    817, a producing property which we elected to curtail during 1998 due to
    downstream pipeline capacity constraints which were alleviated in late 1998
    as a result of the expansion of the Viosca Knoll system. Consolidated cash
    flow should not be considered in isolation or as a substitute for net
    income, cash flow or other income or cash flow data prepared in accordance
    with generally accepted accounting principles or as a measure of our
    profitability or liquidity.

(5) This information is not included in this table as it is not required.

                                       13
<PAGE>   18

                                  RISK FACTORS


     You should carefully consider the following factors in evaluating whether
or not you should participate in the exchange offer. Additional risks not
presently known by, or considered material to, us may also adversely affect our
assets, businesses or prospects or your decision regarding the exchange offer or
your investment in the notes.


     This prospectus includes "forward-looking statements" within the meaning of
Section 27A of the Securities Act and Section 21E of the Securities Exchange Act
of 1934 including, in particular, the statements about our plans, strategies and
prospects under the headings "Prospectus Summary," "Management's Discussion and
Analysis of Financial Condition and Results of Operations," and "Business."
Although we believe that our plans, intentions and expectations reflected in or
suggested by such forward-looking statements are reasonable, we cannot assure
you that we will achieve such plans, intentions or expectations. Important
factors that could cause actual results to differ materially from the
forward-looking statements we make in this prospectus are set forth below and
elsewhere in this prospectus. All forward-looking statements attributable to us
or persons acting on our behalf are expressly qualified in their entirety by the
following cautionary statements.

RISKS RELATED TO THE EXCHANGE OFFER

     FAILURE TO EXCHANGE SERIES A NOTES -- IF YOU DO NOT PROPERLY TENDER YOUR
SERIES A NOTES, YOU WILL CONTINUE TO HOLD UNREGISTERED SERIES A NOTES AND YOUR
ABILITY TO TRANSFER SERIES A NOTES WILL BE ADVERSELY AFFECTED.


     We will only issue Series B notes in exchange for Series A notes that are
timely received by the exchange agent together with all required documents,
including a properly completed and signed letter of transmittal, and not
withdrawn. Therefore, you should allow sufficient time to ensure timely delivery
of the Series A notes and you should carefully follow the instructions on how to
tender your Series A notes. Neither we nor the Exchange Agent are required to
tell you of any defects or irregularities with respect to your tender of the
Series A notes. If you do not tender your Series A notes or if we do not accept
your Series A notes because you did not tender your Series A notes properly,
then, after we consummate the exchange offer, you may continue to hold Series A
notes that are subject to the existing transfer restrictions. In addition, if
you tender your Series A notes for the purpose of participating in a
distribution of the Series B notes, you will be required to comply with the
registration and prospectus delivery requirements of the Securities Act in
connection with any resale of the Series B notes. If you are a broker-dealer
that receives Series B notes for your own account in exchange for Series A notes
that you acquired as a result of market-making activities or any other trading
activities, you will be required to acknowledge that you will deliver a
prospectus in connection with any resale of such Series B notes. After the
exchange offer is consummated, if you continue to hold any Series A notes, you
may have difficulty selling them because there will be less Series A notes
outstanding.



     NO PRIOR MARKET FOR THE NOTES -- YOU CANNOT BE SURE THAT AN ACTIVE, LIQUID
TRADING MARKET WILL DEVELOP FOR THE NOTES.



     The notes are a new issue of securities with no established trading market
and will not be listed on any securities exchange. The liquidity of the trading
market in the notes, and the market price quoted for the notes, may be adversely
affected by changes in the overall market for high yield securities and by
changes in our financial performance or prospects or in the prospects for
companies in our industry generally. As a result, you cannot be sure that an
active trading market will develop for the notes.



     The trading market for each series of notes will depend on the number of
Series A notes tendered and accepted in the exchange offer. Generally, a limited
amount, or "float," of a security could result in less demand to purchase such
security and, as a result, could result in lower prices for such security. If a
large amount of the Series A notes are not tendered or are tendered and not
accepted in the exchange offer, the trading market for the Series B notes could
be materially adversely affected. Conversely, if a large amount


                                       14
<PAGE>   19


of the Series A notes are tendered and accepted, the trading market for the
Series A notes could be materially adversely affected.


RISKS RELATED TO OUR FINANCIAL STRUCTURE AND THE NOTES

     OUR SUBSTANTIAL INDEBTEDNESS COULD ADVERSELY AFFECT OUR FINANCIAL CONDITION
AND PREVENT US FROM FULFILLING OUR OBLIGATIONS UNDER THE NOTES.


     We have a significant amount of indebtedness and the ability to incur more
indebtedness. The following chart presents some of our important credit
statistics at and for the six months ended June 30, 1999. The fixed charge
coverage ratio is presented on a pro forma basis assuming we had completed the
transactions described under "The Transactions" at the beginning of the period
specified and the remaining information represents our historical financial
condition as all of the transactions described under "The Transactions" have
occurred as of June 30, 1999:



<TABLE>
<CAPTION>
                                                                    ACTUAL
                                                               AT JUNE 30, 1999
                                                               -----------------
                                                                 (IN MILLIONS)
<S>                                                            <C>
Total assets................................................        $625.9
Total indebtedness..........................................         481.5
Total partners' capital.....................................         120.0
Ratio of indebtedness to partners' capital..................           4.0x
</TABLE>



<TABLE>
<CAPTION>
                                                                   PRO FORMA
                                                                SIX MONTHS ENDED
                                                                 JUNE 30, 1999
                                                               ------------------
<S>                                                            <C>
Fixed charge coverage ratio(1)..............................            2.2x
</TABLE>


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


(1) As defined on page 13 of this prospectus.



     Concurrently with the closing of the offering of the Series A notes, we
amended our $375.0 million revolving credit facility to, among other things,
extend the maturity from December 1999 to May 2002. As of August 9, 1999, under
our $375.0 million revolving credit facility, as amended (which is
collateralized by a pledge of the stock of our subsidiaries and supported by
guarantees of our subsidiaries), we had $300.0 million outstanding and would
have been permitted to borrow up to an additional $44.5 million, all of which
would have been senior to the notes. Our substantial indebtedness could have
important consequences to you. For example, it could:


     - make it more difficult for us to satisfy our obligations with respect to
       the notes;

     - increase our vulnerability to general adverse economic and industry
       conditions;

     - limit our ability to fund future working capital, capital expenditures
       and other general partnership requirements, future acquisition,
       construction or development activities, or to otherwise fully realize the
       value of our assets and opportunities because of the need to dedicate a
       substantial portion of our cash flow from operations to payments on our
       indebtedness or to comply with any restrictive terms of our indebtedness;

     - limit our flexibility in planning for, or reacting to, changes in our
       businesses and the industries in which we operate; and

     - place us at a competitive disadvantage as compared to our competitors
       that have less debt.

     YOUR RIGHT TO RECEIVE PAYMENTS ON THE NOTES IS UNSECURED AND CONTRACTUALLY
SUBORDINATED TO OUR EXISTING INDEBTEDNESS AND, POSSIBLY, ANY ADDITIONAL
INDEBTEDNESS WE INCUR. FURTHER, THE GUARANTEES OF THE NOTES ARE JUNIOR TO ALL
THE GUARANTORS' EXISTING INDEBTEDNESS AND POSSIBLY TO ALL THEIR FUTURE
BORROWINGS.

     The notes and the subsidiary guarantees rank behind all of our and the
subsidiary guarantors' existing indebtedness (other than trade payables and
certain other indebtedness) and all additional indebtedness (other than trade
payables) we incur unless, and to the extent, that additional indebtedness
expressly provides that it ranks equal with, or junior in right of payment to,
the notes and the guarantees. Assuming

                                       15
<PAGE>   20


we had completed the exchange offering of the Series B notes on August 9, 1999,
the notes would have been subordinated to $300.0 million of senior indebtedness
under our revolving credit facility (which is collateralized by a pledge of all
the stock of our subsidiaries and supported by guarantees of our subsidiaries)
and the guarantees would have been structurally subordinated to an aggregate
$213.8 million of senior indebtedness under the joint venture credit facilities.
In addition, our revolving credit facility, as amended, and the aggregated joint
venture credit facilities could have provided for up to approximately $44.5
million and $59.9 million, respectively, of additional borrowings.


     In addition, all payments on the notes and the guarantees will be blocked
in the event of a payment default on our significant senior indebtedness and may
be blocked for up to 179 consecutive days in the event of certain non-payment
defaults on our significant senior indebtedness.

     In the event of a bankruptcy, liquidation, reorganization or similar
proceeding relating to us, any subsidiary guarantors or our property, our assets
or the assets of the subsidiary guarantors would be available to pay obligators
under the notes only after all payments had been made on our or the guarantors'
senior indebtedness. Our creditors and the subsidiary guarantors' creditors
holding claims which are not subordinated to any applicable senior indebtedness
will in all likelihood be entitled to payments before all of our or the
subsidiary guarantors' senior indebtedness has been paid in full. Therefore,
holders of the notes will participate with trade creditors and all other holders
of our and the guarantors' unsubordinated indebtedness in the assets remaining
after we and the guarantors have paid all of the senior indebtedness. However,
because the note indenture requires that amounts otherwise payable to holders of
the notes in a bankruptcy, liquidation, reorganization or similar proceeding be
paid to holders of senior indebtedness instead, holders of the notes may receive
less, ratably, than holders of trade payables and other creditors in any such
proceeding. In any of these cases, we and the subsidiary guarantors may not have
sufficient funds to pay all of our creditors and, therefore, holders of notes
would receive less, ratably, than the holders of senior indebtedness.

     In addition, the notes are effectively subordinated to the claims of all
creditors, including trade creditors and tort claimants, of our subsidiaries
that are not guarantors. In the event of the insolvency, bankruptcy,
liquidation, reorganization, dissolution or winding up of the business of a
subsidiary that is not a guarantor, creditors of such subsidiary will generally
have the right to be paid in full before any distribution is made to us or the
holders of the notes.

    OUR INDEBTEDNESS MAY RESTRICT OUR ABILITY TO OPERATE.

     Under the terms of our revolving credit facility, we have pledged to
lenders our interest in substantially all of our assets, and we must comply with
various affirmative and negative covenants. Among other things, these covenants
limit our ability to:

     - incur additional indebtedness;

     - make payments in respect of or redeem or acquire any debt or equity
       issued by us;

     - sell assets;

     - make loans or investments;

     - acquire or be acquired by other companies; and

     - amend certain contractual arrangements.

The restrictions under the credit agreement may prevent us from engaging in
certain transactions which might otherwise be considered beneficial to us. Our
credit agreement also requires us to make mandatory repayments under certain
circumstances, including when we sell certain assets or fail to achieve or
maintain certain financial targets.

     If we incur additional indebtedness in the future, it would be under our
existing credit agreement or under arrangements which, we believe, would have
terms and conditions at least as restrictive as those contained in our existing
credit agreement. Failure to comply with the terms and conditions of any
existing

                                       16
<PAGE>   21

or future indebtedness would constitute an event of default. If an event of
default occurs, the lenders will have the right to foreclose upon the
collateral, if any, securing that indebtedness. After such a foreclosure and
payment in full of any senior indebtedness, we might not be able to repay in
full our indebtedness, including the notes.

     FEDERAL AND STATE STATUTES WOULD ALLOW COURTS, UNDER SPECIFIC
CIRCUMSTANCES, TO SUBORDINATE FURTHER OR VOID THE NOTES AND THE GUARANTEES AND
REQUIRE NOTEHOLDERS TO RETURN PAYMENTS RECEIVED FROM US.


     Under the federal bankruptcy law and comparable provisions of state
fraudulent transfer laws, a court could further subordinate or void the notes
and the guarantees if, at the time we issued the notes and the guarantees,
certain facts, circumstances and conditions existed, including that:


     - we received less than reasonably equivalent value or fair consideration
       for the incurrence of such indebtedness; or

     - we were insolvent or rendered insolvent by reason of such incurrence; or

     - we were engaged in a business or transaction for which our remaining
       assets constituted unreasonably small capital; or

     - we intended to incur, or believed that we would incur, indebtedness we
       could not repay at its maturity.


In such a circumstance, a court could require the note holders to return to us
or pay to our other creditors amounts we paid for the notes. This would entitle
other creditors to be paid in full before any payment could be made on the
notes. We may not have sufficient assets after the payment to other creditors.
The guarantees issued by our subsidiaries could be challenged on the same
grounds as the notes. In addition, a creditor may avoid a guarantee based on the
level of benefits received by a guarantor compared to the amount of the
subsidiary guarantee. The indenture contains a savings clause, which generally
limits the obligations of each guarantor to the maximum amount which is not a
fraudulent conveyance. If a subsidiary guarantee is avoided, or limited as a
fraudulent conveyance or held unenforceable for any other reason, you would not
have any claim against the guarantors and would be only creditors of Leviathan
and any guarantor whose subsidiary guarantee was not avoided or held
unenforceable. In such event, your claims against a guarantor would be subject
to the prior payment of all liabilities (including trade payables) of such
guarantor. There can be no assurance that, after providing for all prior claims,
there would be sufficient assets to satisfy your claims relating to any avoided
portions of any of the subsidiary guarantees.


     The measures of insolvency for purposes of these fraudulent transfer laws
will vary depending upon the law applied in any proceeding to determine whether
a fraudulent transfer has occurred. Generally, however, we would be considered
insolvent if:

     - the sum of our indebtedness, including contingent liabilities, were
       greater than the fair value or fair saleable value of all of our assets;

     - if the present fair value or fair saleable value of our assets were less
       than the amount that would be required to pay our probable liability on
       our existing indebtedness, including contingent liabilities, as it
       becomes absolute and mature; or

     - we could not pay our indebtedness as it becomes due.

     There is a risk of a preferential transfer if:

     - a subsidiary guarantor declares bankruptcy or its creditors force it to
       declare bankruptcy within 90 days (or in certain cases, one year) after
       the issuance of the guarantee; or

     - a subsidiary guarantee was made in contemplation of insolvency.

The subsidiary guarantee could be avoided by a court as a preferential transfer.
In addition, a court could require you to return any payments made on the notes
during the 90-day (or one-year) period.

                                       17
<PAGE>   22

     WE MAY NOT BE ABLE TO REPURCHASE NOTES UPON A CHANGE OF CONTROL.

     Upon a change of control, we will be required to repay the amounts
outstanding under our revolving credit facility and to offer to repurchase the
outstanding notes at 101% of the principal amount, plus accrued and unpaid
interest to the date of repurchase. We cannot assure you that we will have
sufficient funds available or that we will be permitted by our other debt
instruments to fulfill these obligations upon the occurrence of a change of
control.


RISKS RELATED TO OUR LEGAL STRUCTURE


     THE INTERRUPTION OF DISTRIBUTIONS TO US FROM OUR SUBSIDIARIES AND JOINT
VENTURES MAY AFFECT OUR ABILITY TO MAKE PAYMENTS ON THE NOTES.

     Leviathan, a co-issuer of the notes, is a holding company. As such, our
primary assets are the capital stock and other equity interests in our
subsidiaries and joint ventures. Consequently, our ability to fund our
commitments (including payments on the notes) depends upon the earnings and cash
flow of our subsidiaries and joint ventures and the distribution of that cash to
us. Distributions from our joint ventures are subject to the discretion of their
respective management committees. In addition, several of our joint ventures
have credit arrangements that contain various restrictive covenants. Among other
things, those covenants limit or restrict such joint ventures' ability to make
distributions to us under certain circumstances. Further, the joint venture
charter documents typically vest in their management committees sole discretion
regarding distributions. We cannot assure you that our joint ventures will
continue to make distributions to us at current levels or at all.


     Moreover, pursuant to some of the joint venture credit arrangements, we
have agreed to return a limited amount of the distributions made to us by the
applicable joint venture if certain conditions exist. See "Management's
Discussion and Analysis of Financial Condition and Results of
Operations -- Liquidity and Capital Resources -- Sources of Cash" beginning on
page 36.


     WE CANNOT CAUSE OUR JOINT VENTURES TO TAKE OR NOT TO TAKE CERTAIN ACTIONS
UNLESS SOME OR ALL OF OUR PARTNERS AGREE.

     Due to the nature of joint ventures, each partner (including Leviathan) in
each of our joint ventures has made substantial contributions and other
commitments to that joint venture and, accordingly, has required that the
relevant charter documents contain certain features designed to provide each
partner with the opportunity to protect its investment in that joint venture, as
well as any other assets which may be substantially dependent on or otherwise
affected by the activities of that joint venture. These protective features
include a corporate governance structure which requires at least a majority in
interest vote to authorize many basic activities and requires a greater voting
interest (sometimes up to 100%) to authorize more significant activities.
Depending on the particular joint venture, these more significant activities
might involve large expenditures or contractual commitments, the construction or
acquisition of assets, borrowing money, transactions with affiliates of a
partner, litigation and/or transactions not in the ordinary course of business,
among others. Thus, without the concurrence of partners with enough voting
interests, we cannot cause any of our joint ventures to take or not to take
certain actions, even though such actions may be in the best interest of the
particular joint venture or Leviathan.

     WE DO NOT HAVE THE SAME FLEXIBILITY AS OTHER TYPES OF ORGANIZATIONS TO
ACCUMULATE CASH AND EQUITY TO PROTECT AGAINST ILLIQUIDITY IN THE FUTURE.

     Unlike a corporation, our partnership agreement requires us to make
quarterly distributions to our unitholders of all available cash reduced by any
amounts reserved for commitments and contingencies, including capital and
operating costs and debt service requirements. Although our payment obligations
to our unitholders are subordinate to our payment obligations to you, the value
of our units will decrease in direct correlation with decreases in the amount we
distribute per unit. Accordingly, if we experience a liquidity problem in the
future, we may not be able to issue equity to recapitalize.

                                       18
<PAGE>   23

    OUR TAX TREATMENT DEPENDS ON OUR PARTNERSHIP STATUS.

     We believe that under current law and regulations we and our subsidiaries
which are limited liability companies will be classified as partnerships for
federal income tax purposes. However, we have not requested, and will not
request, any ruling from the IRS with respect to our or our subsidiaries'
respective classifications as partnerships for federal income tax purposes or
any other matter affecting us or our subsidiaries. Accordingly, the IRS may
adopt positions that differ from our conclusions expressed herein. It may be
necessary to resort to administrative or court proceedings in an effort to
sustain some or all of our conclusions, and some or all of such conclusions
ultimately may not be sustained. We will bear the costs of any such contest with
the IRS. Except as specifically noted, this discussion assumes that we and our
subsidiaries are treated as partnerships for federal income tax purposes.

     If we were classified as an association taxable as a corporation for
federal income tax purposes in any taxable year, our income, gains, losses,
deductions and credits would be reflected on our tax return rather than being
passed through to our partners, and we would be taxed at corporate rates. This
would materially and adversely affect our ability to make payments on the notes.


     For general discussion of the expected federal income tax consequences of
acquiring, owning and disposing of the notes, see "Certain United States Federal
Income Tax Considerations" beginning on page 141 of this prospectus.


RISKS RELATED TO OUR BUSINESS

     OUR PERFORMANCE DEPENDS ON FACTORS OUT OF OUR CONTROL, INCLUDING THE RATES
FOR, AND VOLUME OF, PRODUCTION THAT WE HANDLE.

     Our ability to make payments on and to pay or refinance our indebtedness,
including the notes, and to fund future working capital, capital expenditures
and other general corporate requirements will depend on our ability to generate
cash in the future. This, to a certain extent, is subject to economic,
financial, competitive, legislative, regulatory and other factors that are
beyond our control.

     Our future performance and, therefore, our ability to make payments to you
on the notes will largely depend on the volume of, and rates for, the natural
gas and oil handled by our pipelines, platforms and other infrastructure. Many
factors outside of our control can affect these volumes and rates. The following
factors, among others, affect the rates that our pipelines may charge:

     - prices for the production handled;

     - competition from other pipelines; and

     - the maximum rates established by the Federal Energy Regulatory Commission
       for our regulated pipelines.

Any decrease in the rates charged or volumes handled by any of our pipelines and
other facilities could reduce our available cash. Accordingly, we cannot assure
you that we will be able to continue to generate enough cash flow to satisfy our
existing commitments, including making interest and principal payments on our
indebtedness.

     Based on our current and anticipated level of operations and revenue
growth, we believe our cash flow from operations, available cash and available
borrowings under our revolving credit facility will be adequate to conduct our
businesses as they currently exist. We cannot assure you, however, that these or
other sources of capital will be available to us in amounts sufficient to enable
us to pay our indebtedness, including the notes, or to fund our other liquidity
needs, including the purchase, construction or other acquisition of assets or
businesses in the future. We may need to pay or refinance all or a portion of
our indebtedness, including the notes, on or before maturity. We cannot assure
you that we will be able to do that on commercially reasonable terms or at all.

                                       19
<PAGE>   24

     OUR FUTURE PERFORMANCE DEPENDS ON SUCCESSFUL EXPLORATION AND DEVELOPMENT OF
ADDITIONAL OIL AND NATURAL GAS RESERVES.

     The natural gas and oil reserves available to our pipelines and other
infrastructure from existing wells naturally decline over time. In order to
offset this natural decline, our pipelines and other infrastructure must access
additional reserves. This means that our long-term prospects depend upon the
successful exploration and development of additional reserves by third parties
in areas accessible to our pipelines and other infrastructure.

     Finding and developing new natural gas and oil reserves from offshore
properties is very expensive. The Flextrend and Deepwater areas, especially,
will require large capital expenditures by third party producers for
exploration, development drilling, installation of production facilities and
pipeline extensions to reach the new wells.

     Many economic and business factors out of our control can adversely affect
the decision by any third party producer to explore for and develop new
reserves. These factors include relatively low natural gas and oil prices, cost
and availability of equipment, capital budget limitations or the lack of
available capital. For example, because of the recent decline in hydrocarbon
prices, the level of overall oil and natural gas activity in the Gulf has
declined from recent years. If hydrocarbon prices remain low and capital
spending by the energy industry continues to decrease or remains at low levels
for prolonged periods, our results of operations and cash flow could suffer.
Consequently, we cannot assure you that additional reserves will be discovered
or developed in the near future, or that they exist at all.


     IF WE PROCEED WITH THE DEVELOPMENT OF OUR EWING BANK 958 UNIT WITHOUT A
PARTNER WHO WILL SHARE A SIGNIFICANT PORTION OF THE COSTS, WE WILL REQUIRE MORE
CAPITAL THAN IS CURRENTLY AVAILABLE FROM OUR EXISTING SOURCES.



     The development plan we filed with the U.S. Department of Interior Minerals
Management Service ("MMS") estimates that it will cost approximately $100.0
million in drilling costs, including amounts to drill, complete and tie-back the
producing wells, and $150.0 million in infrastructure costs, including amounts
to design, construct and install the producing platform and export pipelines.
These estimates are inherently uncertain, and the drilling costs in particular
could exceed materially our forecast because of the uncertainties and
difficulties associated with Deepwater drilling operations.



     We currently do not have, and may not be able to obtain, the capital
required to undertake 100% of the development of our Ewing Bank 958 Unit and the
related infrastructure. While we expect to have a partner in this project
pursuant to an exchange, sale, farmout, joint venture or similar arrangement, we
cannot assure you that we will be successful in structuring such an arrangement.
If no such arrangement exists, we will have to raise additional capital through
another source or we will not be able to proceed with this development as
currently planned. We cannot assure you that any such source of capital would be
available to complete this project or that this project will be completed as
contemplated, if at all.


     PRICE AND VOLUME VOLATILITY IS SUBSTANTIALLY OUT OF OUR CONTROL AND IT
COULD HAVE AN ADVERSE AFFECT ON OUR PRODUCTION BUSINESS.

     Our business and, to a certain extent, our ability to repay our
indebtedness will be substantially affected by our future production from our
oil and natural gas properties. The level of success of our future production
from such properties is largely dependent on factors out of our control, such as
the volume of, and prices realized for, the natural gas and oil produced from
our oil and natural gas properties. In 1998, oil and natural gas prices
dramatically declined, and we cannot assure you that there will not be further
declines in commodity prices. Based on 1998 production levels of our currently
producing properties which are depleting assets, for every $0.10 decline in the
average price for natural gas and every $1.00 decline in the average price for
oil we actually realized, our cash flow from operations would be reduced by $1.1
million and $0.5 million, respectively.

                                       20
<PAGE>   25

     WE WILL FACE COMPETITION FROM THIRD PARTIES TO HANDLE ANY NEW PRODUCTION.

     Even if additional reserves exist in the areas accessed by our pipelines
and are ultimately produced, we cannot assure you that any of these reserves
will be gathered, transported, processed or otherwise handled by any of our
pipelines and other infrastructure. We would compete with others for any such
production on the basis of many factors, including:

     - geographic proximity to the production;

     - costs of connection;

     - available capacity;

     - rates; and

     - access to onshore markets.

     POTENTIAL FUTURE EXPANSIONS MAY SUBSTANTIALLY INCREASE THE LEVEL OF OUR
INDEBTEDNESS AND MAY ADVERSELY AFFECT OUR BUSINESS, IF WE CANNOT EFFECTIVELY
INTEGRATE THESE NEW OPERATIONS.

     We intend to continue to construct, purchase and otherwise acquire assets
(including entire businesses) that we believe will present opportunities to
realize significant synergies, expand our role in the energy infrastructure
business and/or increase our market position. This strategy may require
substantial capital, and we may not be able to raise the necessary funds on
satisfactory terms or at all.

     We regularly engage in discussions with respect to potential acquisition
and investment opportunities. If we consummate any future acquisitions, our
capitalization and results of operations may change significantly and you will
not have the opportunity to evaluate the economic, financial and other relevant
information that we will consider in determining the application of these funds.

     We are currently considering some specific future acquisitions or
investments, although we cannot assure you that we will be able to reach
agreement with respect to any such opportunities. If consummated, any such
acquisition would likely result in the incurrence of indebtedness and contingent
liabilities and an increase in interest expense and amortization expenses
related to goodwill and other intangible assets, which could have a material
adverse effect upon our business.

     Acquisitions and business expansions involve numerous risks, including
difficulties in the assimilation of the operations, technologies, services and
products of the acquired companies or business segments and the diversion of
management's attention from other business concerns. For all of these reasons,
if any such acquisitions or expansions occur, our business could be adversely
affected.

     FERC REGULATION AND A CHANGING REGULATORY ENVIRONMENT COULD AFFECT OUR CASH
FLOW.

     The Federal Energy Regulatory Commission extensively regulates certain of
our pipelines. This regulation extends to such matters as:

     - rate structures;

     - rates of return on equity;

     - the services that our regulated pipelines are permitted to perform;

     - their ability to seek recovery of various categories of costs;

     - the acquisition, construction and disposition of assets; and

     - to an extent, the level of competition in the interstate pipeline
       industry.

     Given the extent of this regulation, the extensive changes in FERC policy
over the last several years, the evolving nature of regulation and the
possibility for additional changes, we cannot assure you that the

                                       21
<PAGE>   26

current regulatory regime will remain unchanged or of the effect any changes in
that regime would have on our financial position, results of operations or cash
flows.

     Our regulated pipelines are over 20 years old. As a result, each such
pipeline has depreciated significant portions of its initial capital
expenditures. Unless those pipelines make additional capital expenditures, they
could be fully depreciated within five years. This would reduce the rate base
and increase the likelihood that FERC would reduce the approved rates for each
of those pipelines.

     OUR ACTUAL PROJECT COSTS COULD EXCEED OUR FORECAST, AND OUR CASH FLOW FROM
PROJECTS MAY NOT BE IMMEDIATE.

     Our forecast contemplates significant expenditures for the acquisition,
construction and expansion of our pipelines and related infrastructure.
Underwater operations, especially those in water depths in excess of 600 feet,
are very expensive and involve much more uncertainty and risk than other
operations. Further, if a problem occurs, the solution (if one exists) may be
very expensive and time consuming. Accordingly, there is an increase in the
frequency and amount of cost overruns related to underwater operations,
especially in depths in excess of 600 feet. We cannot assure you that we will be
able to complete our projects at the costs currently estimated. If we experience
material cost overruns, we would have to finance these overruns using one or
more of the following methods:

     - borrowing from our revolving credit facility;

     - using cash from operations;

     - delaying other planned projects;

     - issuing additional debt or equity.

Any or all of these methods may not be available when needed or could adversely
affect our future results of operations.

     Our revenues may not increase immediately upon the expenditure of funds on
a particular project. For instance, if we build a new pipeline, the construction
will occur over an extended period of time and we may not receive any material
increase in revenue from that project until after the reserves committed to it
are developed and produced. If our revenues do not increase at projected levels
because of substantial unanticipated delays of any future projects, we might not
meet our obligations as they become due.

     CHANGES OF CONTROL OF OUR GENERAL PARTNER MAY ADVERSELY AFFECT YOU.

     Our results of operations and ability to pay amounts due under the notes
could be adversely affected if there is a change in management resulting from a
change of control of our general partner. El Paso Energy is not restricted from
selling the general partner or any of the common units it holds. Such actions,
however, result in a change of control under the terms of the indenture
governing the notes. As a result, El Paso Energy could sell control of our
general partner to another company with less familiarity and experience with our
businesses and with different business philosophies and objectives. We cannot
assure you that any such acquiror would continue our current business strategy,
or even a business strategy economically compatible with our current business
strategy.

     EL PASO ENERGY AND ITS AFFILIATES MAY HAVE CONFLICTS OF INTEREST WITH US
AND, ACCORDINGLY, YOU.

     El Paso Energy is a New York Stock Exchange-traded company whose principal
operations include the interstate and intrastate transportation, gathering and
processing of natural gas; the marketing of natural gas, power, and other
energy-related commodities; power generation and the development and operation
of energy infrastructure facilities worldwide. El Paso Energy invested $422.0
million in August 1998 to acquire beneficial control of our general partner (it
holds, indirectly through our general partner and certain other subsidiaries, a
34.5% interest in us, including 100% of the general partner interest). With
respect to future investments, El Paso Energy's strategy is for us to serve as
its primary offshore gathering

                                       22
<PAGE>   27

and transportation growth vehicle in the Gulf (when practical), although El Paso
Energy is not precluded from retaining gathering and transportation
opportunities for itself.

     El Paso Energy (through a wholly owned subsidiary) elects all of the
general partner's directors, who in turn select all of our executive officers
and those of the general partner. In addition, El Paso Energy's beneficial
control and ownership of 32.5% of our outstanding units could have a substantial
effect on the outcome of some actions requiring unitholder approval.

     Although El Paso Energy controls our general partner and has financial
incentives to protect its investment by encouraging our success and it plans to
use us as its principal offshore gathering and transportation growth vehicle in
the Gulf (when practical), El Paso Energy is not contractually bound to do so
and may reconsider at any time, without notice. Additionally, El Paso Energy is
not required to pursue a business strategy that will favor our business
opportunities over the business opportunities of El Paso Energy or any of its
affiliates (or any other competitor of ours acquired by El Paso Energy). In
fact, El Paso Energy may have financial motives to favor our competitors. El
Paso Energy and its subsidiaries (many of which are wholly owned) operate in
some of the same lines of business and in some of the same geographic areas in
which we operate. Although we acquired the remaining interest in Viosca Knoll
from El Paso Energy, El Paso Energy continues to own pipelines and related
facilities located in the Gulf, including the Bluewater and Seahawk Shoreline
systems. In addition, shareholders of El Paso Energy and Sonat Inc. recently
approved a planned merger. Sonat also owns pipelines and related assets in the
Gulf, as well as numerous oil and natural gas properties, including properties
in the Gulf. To the extent we continue to acquire interests in oil and natural
gas properties and if the merger between El Paso Energy and Sonat is completed,
our activities may compete with the exploration, development and marketing
activities of Sonat conducted by El Paso Energy.


     In addition, we have, and we expect to enter into other, significant
business relationships with El Paso Energy, our general partner and their
affiliates. For instance, in January 1999, we entered into an agreement with El
Paso Energy to purchase substantially all of its interest in Viosca Knoll
gathering system, and in October 1998, we purchased the Ewing Bank 958 Unit from
El Paso Energy. See "Certain Relationships and Related Transactions" beginning
on page 76 and "Business -- Recent Developments, Acquisitions and New Projects"
beginning on page 48 for a further discussion of the Viosca Knoll and Ewing Bank
958 Unit transactions.


     We and our general partner and its affiliates share and, therefore, will
compete for, the time and effort of general partner personnel who provide
services to us. Officers of the general partner and its affiliates do not, and
will not be required to, spend any specified percentage or amount of time on our
business. Since these shared officers function as both our representatives and
those of our general partner and its affiliates, conflicts of interest could
arise between our general partner and its affiliates, on the one hand, and us or
you, on the other.

     In most instances in which an actual or potential conflict of interest
arises between us, on the one hand, and our general partner or its affiliates,
on the other hand, there will be a benefit to our general partner or its
affiliates in which neither we nor you will share. Such conflicts may arise in
situations which include (1) compensation paid to the general partner, which
includes incentive distributions and reimbursements for reasonable general and
administrative expenses; (2) payments to the general partner and its affiliates
for any services rendered to us or on our behalf; (3) our general partner's
determination of which direct and indirect costs we must reimburse; (4)
decisions to enter into and the terms of transactions between us and our general
partner or any of its affiliates, including transactions involving joint
ventures, acquisitions and gathering and transportation; (5) the acquisition or
operation of businesses by our general partner or its affiliates that would
compete with us; and (6) our general partner's determination to establish cash
reserves under certain circumstances and thereby decrease cash available for
distributions to unitholders.

     OUR PARTNERSHIP AGREEMENT PURPORTS TO LIMIT OUR GENERAL PARTNERS' FIDUCIARY
DUTIES AND CERTAIN OTHER OBLIGATIONS RELATING TO US.

                                       23
<PAGE>   28

     In addition, our general partner (Leviathan Gas Pipeline Company), but not
El Paso Energy or any of its other affiliates, will owe certain fiduciary duties
to us and will be liable for all our debts (other than non-recourse debts) to
the extent not paid by us. Further, certain provisions of our partnership
agreement contain exculpatory language purporting to limit the liability of the
general partner to us and our unitholders. For example, the partnership
agreement provides that:

     - borrowings of money by us, or the approval thereof by the general
       partner, will not constitute a breach of any duty of the general partner
       to us or our unitholders whether or not the purpose or effect of the
       borrowing is to permit distributions on common units or to result in or
       increase incentive distributions to the general partner;

     - any action taken by the general partner consistent with the standards of
       reasonable discretion set forth in certain definitions in our partnership
       agreement will be deemed not to breach any duty of the general partner to
       us or to our unitholders; and

     - in the absence of bad faith by the general partner, the resolution of
       conflicts of interest by the general partner will not constitute a breach
       of the partnership agreement or a breach of any standard of care or duty.


     Provisions of the partnership agreement also purport to modify the
fiduciary duty standards to which the general partner would otherwise be subject
under Delaware law, under which a general partner owes its limited partners the
highest duties of good faith, fairness and loyalty. Such duty of loyalty would
generally prohibit the general partner from taking any action or engaging in any
transaction as to which it had a conflict of interest. The partnership agreement
permits the general partner to exercise the discretion and authority granted to
it in that agreement in managing us and in conducting its retained operations,
so long as its actions are not inconsistent with our interests. The general
partner and its officers and directors may not be liable to us or to our
unitholders for certain actions or omissions which might otherwise be deemed to
be a breach of fiduciary duty under Delaware or other applicable state law.
Further, the partnership agreement requires us to indemnify the general partner
to the fullest extent permitted by law, which indemnification, in light of the
exculpatory provisions in the partnership agreement, could result in us
indemnifying the general partner for its negligent acts.


     A NATURAL DISASTER OR OTHER CATASTROPHE COULD DAMAGE OUR PIPELINES AND
OTHER INCOME-PRODUCING ASSETS, CURTAIL THEIR OPERATIONS AND, POSSIBLY, ADVERSELY
AFFECT OUR CASH FLOW.


     If one or more of our pipelines or other income-producing assets is damaged
by severe weather or any other natural disaster, accident or catastrophe, our
operations could be significantly interrupted. Similar interruptions could
result from damage to production facilities or other production stoppages
arising from factors beyond our control. These interruptions might range from a
week or less for a minor incident to six months or a year or more for a major
interruption. Any event that interrupts the fees generated by our pipelines or
other income-producing assets, or which causes us to make significant
expenditures not covered by insurance, could adversely impact the market price
of, and the amount of cash available for payment of, the notes. Further,
although we carry business interruption insurance that we consider to be
appropriate, we cannot assure you that it would cover all types of interruptions
that might occur, and in the future we may not be able to obtain desirable
insurance on commercially reasonable terms.


     ENVIRONMENTAL COSTS AND LIABILITIES AND CHANGING ENVIRONMENTAL REGULATION
COULD AFFECT OUR CASH FLOW.

     Our operations are subject to extensive federal, state and local regulatory
requirements relating to environmental affairs, health and safety, waste
management and chemical products. Governmental authorities have the power to
enforce compliance with applicable regulations and permits and to subject
violators to civil and criminal penalties, including civil fines, injunctions or
both. Third parties may also have the right to pursue legal actions to enforce
compliance. We will probably make expenditures in connection with environmental
matters as part of normal capital expenditure programs. However, future
environmental law developments, such as stricter laws, regulations or
enforcement policies, could

                                       24
<PAGE>   29

significantly increase our cost of handling, manufacture, use, emission or
disposal of substances or wastes. Moreover, as with other companies engaged in
similar or related businesses, our operations always have some risk of
environmental costs and liabilities because we handle petroleum products. We
cannot assure you that we will not incur material environmental costs and
liabilities.

     THE YEAR 2000 PROBLEM MAY RESULT IN DECREASED REVENUES FOR US IF THIRD
PARTIES DO NOT ADEQUATELY ADDRESS THEIR YEAR 2000 CONCERNS.


     We are substantially completed with the assessment, remediation and
implementation phases of our Year 2000 project. However, the responses that we
have received from third parties, including partners, third party customers and
vendors and operators of joint ventures in which we have an interest, regarding
their Year 2000 efforts are inconclusive. Further, certain of our systems and
processes may be interrelated with systems outside of our control.


     Unsuccessful Year 2000 efforts, either on our part or on the part of third
parties, may adversely affect our financial position, results of operations
and/or cash flows. A significant portion of the oil and natural gas handled by
our pipelines is owned by third parties. Accordingly, failure by the owners of
oil and natural gas to be ready for the Year 2000 could significantly disrupt
the flow of the hydrocarbons to customers. However, in many cases, the owners
have no direct contractual relationship with us, and we are relying on our
customers to verify the Year 2000 readiness of the producers from whom they
purchase oil and natural gas. A portion of our revenue is based upon fees paid
by our customers for the reservation of capacity and a portion of the revenue is
based upon the volume of actual throughput. As such, short-term disruptions in
throughput caused by factors beyond our control may have a financial impact on
us and could cause operational problems for our customers. Longer-term
disruptions could materially impact our operational and financial condition, and
therefore affect the market price of, and our ability to make payments on, the
notes.

                                       25
<PAGE>   30

                                THE TRANSACTIONS


SERIES A NOTES TRANSACTIONS


     In connection with the completion of the offering of the Series A notes, we
consummated the transactions described below.

     LEVIATHAN CREDIT FACILITY


     We amended our $375.0 million revolving credit facility to, among other
things, extend the maturity from December 1999 to May 2002. As of August 9,
1999, we had $300.0 million outstanding under our revolving credit facility
bearing interest at an average floating rate of 7.7% per annum. For additional
information on our revolving credit facility, see "Management's Discussion and
Analysis of Financial Condition and Results of Operations -- Liquidity and
Capital Resources" beginning on page 36 and "Description of Other
Indebtedness -- Leviathan Credit Facility" beginning on page 133.


     VIOSCA KNOLL TRANSACTION


     Prior to the offering of the Series A notes, Viosca Knoll Gathering Company
was owned 50.0% by us and 50.0% by El Paso Energy (through a wholly owned
subsidiary). In January 1999, we entered into an agreement with El Paso Energy
to acquire an additional 49.0% interest in Viosca Knoll, which would result in
us owning 99.0% of Viosca Knoll, with an option to purchase the remaining 1.0%.
The acquisition price for the additional 49.0% interest was $79.7 million,
comprised of 25.0% in cash (approximately $19.9 million) and 75.0% in common
units (2,661,870 common units based on a price of $22.4625 per unit).



     Following the consummation of the Viosca Knoll transaction in June 1999, El
Paso Energy's effective ownership interest in us is 34.5%. In addition, at the
closing of the Viosca Knoll transaction, El Paso Energy contributed
approximately $33.4 million in cash to Viosca Knoll, which equalled 50.0% of the
principal amount outstanding under Viosca Knoll's credit facility. Thereafter,
we repaid in full and terminated the Viosca Knoll credit facility. For
additional information on the Viosca Knoll transaction, see "Business -- Natural
Gas and Oil Pipelines -- Viosca Knoll System" beginning on page 52.



OTHER POST-SERIES A NOTES TRANSACTIONS



     In addition, we closed the following transaction on June 30, 1999.



     UTOS/HIOS/EAST BREAKS ACQUISITION



     Prior to June 30, 1999, we owned a 33.3% partnership interest in U-T
Offshore System and a 40.0% membership interest in Western Gulf Holdings, L.L.C.
(which owns 100% of each of High Island Offshore System, L.L.C. and East Breaks
Gathering Company, L.L.C.). On June 30, 1999, we acquired, for total
consideration of approximately $51 million, two companies from Natural Gas
Pipeline Company of America, a subsidiary of KN Energy, Inc., which companies
owned 33.3% of UTOS and 20.0% of Western Gulf. As a result, we now own 66.7% of
UTOS and 60.0% of Western Gulf (and, thus, 60.0% of each of HIOS and East
Breaks). We also acquired ownership interests in certain offshore pipeline
laterals as part of the transaction. For additional information on the
UTOS /HIOS /East Breaks acquisition, see "Business -- Recent Developments,
Acquisitions and New Projects -- UTOS /HIOS /East Breaks Acquisition, Joint
Venture Restructuring and East Breaks Pipeline Construction" on page 48.


                                       26
<PAGE>   31

                                USE OF PROCEEDS

     We will not receive any cash proceeds from the issuance of the Series B
notes. In consideration for issuing the Series B notes as contemplated in this
prospectus, we will receive in exchange Series A notes in like principal amount,
which will be canceled and as such will not result in any increase in our
indebtedness.

     Our net proceeds from the offering of the Series A notes were approximately
$168.5 million. We used the net proceeds as follows:

<TABLE>
<CAPTION>
                            USE                                   AMOUNT
                            ---                                -------------
                                                               (IN MILLIONS)
<S>                                                            <C>
To reduce the balance outstanding under, and to extend, our
  credit facility...........................................      $115.2
To repay the Viosca Knoll credit facility...................        33.4
To consummate the Viosca Knoll transaction..................        19.9
                                                                  ------
          Total.............................................      $168.5
                                                                  ======
</TABLE>


     Concurrently with the closing of the offering of the Series A notes, we
amended our revolving credit facility to, among other things, extend the
maturity from December 1999 to May 2002. We used approximately $115.2 million of
the offering proceeds to temporarily reduce the outstanding balance to
approximately $250.0 million (subject to adjustment) and to pay related fees and
expenses. As of August 9, 1999, we had $300.0 million outstanding under the
revolving credit facility bearing interest at an average floating rate of 7.7%
per annum. Over the past 12 months, we used borrowings under the revolving
credit facility to, among other things, (1) finance the acquisition and
development of our non-producing property, the Ewing Bank 958 Unit ($30.0
million), (2) finance the construction and installation of a new platform and
production handling facilities at East Cameron Block 373 ($9.4 million), (3) pay
amounts related to the abandonment of the Ewing Bank flowlines ($2.9 million),
(4) finance the construction of the Allegheny oil pipeline ($22.8 million), and
(5) pay our management in connection with the accelerated vesting of the Unit
Rights discussed in "Management -- Executive Compensation -- Unit Rights
Appreciation Plan" ($8.6 million) beginning on page 73.



     The price for our acquisition of the additional interest in Viosca Knoll
was $79.7 million, of which $19.9 million was paid in cash with proceeds from
the offering of the Series A notes and $59.8 million was paid in our newly
issued common units. In addition, we repaid in full and terminated the Viosca
Knoll credit facility on June 1, 1999. Of the approximately $66.7 million which
was repaid under this credit facility, $33.4 million came from proceeds of the
offering of the Series A notes and the remaining approximately $33.4 million was
contributed by El Paso Energy to Viosca Knoll at the closing of the acquisition.
Over the past 12 months, Viosca Knoll used borrowings under its credit facility
for the addition of compression facilities to and expansion of the Viosca Knoll
system and for other working capital needs. For additional information on the
Viosca Knoll transaction, see "The Transactions" beginning on page 26 and
"Business -- Natural Gas and Oil Pipelines -- Viosca Knoll System" beginning on
page 52.



     In addition, on June 30, 1999, we paid approximately $51.0 million in
connection with the acquisition of additional interests in UTOS and Western Gulf
described in "Business -- Recent Developments, Acquisitions and New
Projects -- UTOS/HIOS/East Breaks Acquisition -- Joint Venture Restructuring and
East Breaks Pipeline Construction," all of which was paid in cash.


                                       27
<PAGE>   32

                                 CAPITALIZATION


     The following table sets forth our unaudited consolidated capitalization on
a historical basis as of June 30, 1999 and reflects (1) the issuance of the
notes, (2) the consummation of the Viosca Knoll transaction, (3) the repayment
and cancellation of Viosca Knoll's credit facility, (4) the reduction of our
revolving credit facility, (5) the payment of transaction costs, and (6) the
consummation of the UTOS/HIOS/East Breaks acquisition. See "Use of Proceeds"
beginning on page 27. You should read this table along with "Management's
Discussion and Analysis of Financial Condition and Results of Operations"
beginning on page 31 and our consolidated financial statements and notes thereto
listed on pages F-1 and F-2.



<TABLE>
<CAPTION>
                                                                    AS OF
                                                                   JUNE 30,
                                                                     1999
                                                                --------------
                                                                (IN THOUSANDS)
<S>                                                             <C>
Long-term debt:
  Revolving credit facility(1)..............................       $306,500
  Senior subordinated notes due 2009........................        175,000
                                                                   --------
          Total long-term debt..............................        481,500
                                                                   --------
Minority interest...........................................           (249)
                                                                   --------
Partners' capital...........................................        120,036
                                                                   --------
               Total capitalization.........................       $601,287
                                                                   ========
</TABLE>


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


(1) See "Use of Proceeds" beginning on page 27 and "Management's Discussion and
    Analysis of Financial Condition and Results of Operations -- Liquidity and
    Capital Resources" beginning on page 36 for additional information
    concerning the amendment of the revolving credit facility and the repayment
    of borrowings under the revolving credit facility with net proceeds from the
    offering of the Series A notes.


                                       28
<PAGE>   33

                SELECTED HISTORICAL CONSOLIDATED FINANCIAL DATA


     The historical financial information for each of the three years ended
December 31, 1996, 1997 and 1998 and as of December 31, 1997 and 1998 was
derived from our consolidated financial statements and notes thereto included
elsewhere in this prospectus. The historical financial information for the years
ended December 31, 1994 and 1995 and as of December 31, 1994, 1995 and 1996 has
been derived from our historical consolidated financial statements (not included
herein). The historical financial data for each of the six months ended June 30,
1998 and 1999 and as of June 30, 1999 was derived from our unaudited
consolidated financial statements and notes thereto included elsewhere in this
prospectus. The historical financial data as of June 30, 1998 has been derived
from our unaudited historical consolidated financial statements (not included
herein). We believe that all material adjustments, consisting only of normal
recurring adjustments necessary for the fair presentation of our interim
results, have been included. Results of operations for any interim period are
not necessarily indicative of the results of operations for the entire year due
to the seasonal nature of our business. You should read this information along
with "Management's Discussion and Analysis of Financial Condition and Results of
Operations" beginning on page 31, "Business" beginning on page 44 and the
consolidated financial statements and notes thereto listed on pages F-1 and F-2.



<TABLE>
<CAPTION>
                                                                                              SIX MONTHS
                                                 YEAR ENDED DECEMBER 31,                    ENDED JUNE 30,
                                   ----------------------------------------------------   -------------------
                                     1994       1995       1996       1997       1998       1998       1999
                                   --------   --------   --------   --------   --------   --------   --------
                                                                                              (UNAUDITED)
                                               (IN THOUSANDS, EXCEPT PER UNIT AMOUNTS AND RATIOS)
<S>                                <C>        <C>        <C>        <C>        <C>        <C>        <C>
STATEMENT OF OPERATIONS:
Oil and natural gas sales........  $    796   $  1,858   $ 47,068   $ 58,106   $ 31,411   $ 15,734   $ 15,100
Gathering, transportation and
  platform services..............    18,554     20,547     24,005     17,329     17,320      7,782     10,798
Equity in earnings...............    14,786     19,588     20,434     29,327     26,724     12,571     19,953
                                   --------   --------   --------   --------   --------   --------   --------
         Total revenue...........    34,136     41,993     91,507    104,762     75,455     36,087     45,851
                                   --------   --------   --------   --------   --------   --------   --------
Operating expenses...............     1,876      4,092      9,068     11,352     11,369      5,546      5,025
Depreciation, depletion and
  amortization...................     5,085      8,290     31,731     46,289     29,267     14,845     13,727
Impairment, abandonment and
  other..........................        --         --         --     21,222     (1,131)        --         --
General and administrative
  expenses and management fee....     5,408      7,069      8,540     14,661     16,189      7,503      5,909
                                   --------   --------   --------   --------   --------   --------   --------
         Total operating costs...    12,369     19,451     49,339     93,524     55,694     27,894     24,661
                                   --------   --------   --------   --------   --------   --------   --------
Operating income.................    21,767     22,542     42,168     11,238     19,761      8,193     21,190
Interest income and other........     1,293      1,884      1,710      1,475        771        157        268
Interest and other financing
  costs..........................      (912)      (833)    (5,560)   (14,169)   (20,242)    (8,429)   (13,868)
Minority interest in (income)
  loss...........................      (216)      (251)      (427)         7        (15)        (3)       (80)
                                   --------   --------   --------   --------   --------   --------   --------
Income (loss) before income
  taxes..........................    21,932     23,342     37,891     (1,449)       275        (82)     7,510
Income tax benefit...............       136        603        801        311        471        168        177
                                   --------   --------   --------   --------   --------   --------   --------
         Net income (loss).......  $ 22,068   $ 23,945   $ 38,692   $ (1,138)  $    746   $     86   $  7,687
                                   ========   ========   ========   ========   ========   ========   ========
Basic and diluted income (loss)
  per unit.......................  $   1.02   $   0.97   $   1.57   $  (0.06)  $   0.02   $   0.00   $   0.25
                                   ========   ========   ========   ========   ========   ========   ========
Distributions declared per common
  unit...........................  $   1.20   $   1.20   $   1.45   $   1.85   $   2.10   $   1.05   $   1.05
                                   ========   ========   ========   ========   ========   ========   ========
Distributions declared per
  preference unit................  $   1.20   $   1.20   $   1.45   $   1.85   $   1.60   $   1.05   $   0.55
                                   ========   ========   ========   ========   ========   ========   ========
</TABLE>


                                       29
<PAGE>   34


<TABLE>
<CAPTION>
                                                                                              SIX MONTHS
                                                 YEAR ENDED DECEMBER 31,                    ENDED JUNE 30,
                                   ----------------------------------------------------   -------------------
                                     1994       1995       1996       1997       1998       1998       1999
                                   --------   --------   --------   --------   --------   --------   --------
                                                                                              (UNAUDITED)
                                               (IN THOUSANDS, EXCEPT PER UNIT AMOUNTS AND RATIOS)
<S>                                <C>        <C>        <C>        <C>        <C>        <C>        <C>
OTHER FINANCIAL DATA:
Capital expenditures.............  $ 98,398   $173,632   $101,721   $ 41,957   $ 66,111   $ 19,366   $ 92,818
Consolidated cash flow(1)........  $ 28,316   $ 36,523   $ 91,998   $ 77,846   $ 52,804   $ 23,922   $ 39,340
Fixed charges(2).................  $    912   $  6,102   $ 17,470   $ 15,890   $ 21,308   $  8,954   $ 14,623
Fixed charge coverage ratio(3)...     31.0x       6.0x       5.3x       4.9x       2.5x       2.7x       2.7x
Ratio of earnings to fixed
  charges(4).....................     25.3x       4.0x       2.5x       0.8x       1.0x       0.9x       1.5x
BALANCE SHEET DATA (AT END OF
  PERIOD):
Total assets.....................  $231,043   $398,696   $453,526   $409,842   $442,726   $406,087   $625,913
Total debt.......................  $  8,000   $135,780   $227,000   $238,000   $338,000   $270,000   $481,500
Total partners' capital..........  $192,431   $186,841   $192,023   $143,966   $ 82,896   $113,557   $120,036
</TABLE>


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

(1) For purposes of the above presentation, "consolidated cash flow" has been
    calculated in accordance with the Indenture. For the exact definition of
    this term, see "Description of Notes -- Certain Definitions" on page 111 of
    this prospectus. As defined, generally, "consolidated cash flow" means
    Leviathan's consolidated net income, plus (1) cash distributions to
    Leviathan and its restricted subsidiaries from persons other than its
    restricted subsidiaries, (2) extraordinary losses, (3) income tax expense,
    (4) interest and other financing costs, to the extent deducted and
    calculated in consolidated net income, (5) depreciation, depletion and
    amortization and (6) other non-cash charges, to the extent deducted and
    calculated in consolidated net income, less (7) extraordinary non-cash items
    that increase Leviathan's consolidated net income and (8) earnings
    attributable to persons other than its restricted subsidiaries. Consolidated
    cash flow should not be considered in isolation or as a substitute for net
    income, cash flow or other income or cash flow data prepared in accordance
    with generally accepted accounting principles or as a measure of our
    profitability or liquidity.

(2) "Fixed charges" consist of interest costs (whether expensed or capitalized),
    amortization of debt issue costs and certain pre-tax preferred stock
    dividend requirements of Leviathan and any restricted subsidiary.

(3) "Fixed charge coverage ratio" is calculated as "consolidated cash flow"
    divided by "fixed charges."

(4) For the purpose of this calculation, "earnings" represents income (loss)
    from continuing operations before income taxes and minority interest, plus
    fixed charges exclusive of interest capitalized. As a result of the loss
    incurred in 1997, we were unable to fully cover the indicated fixed charges
    by $3.2 million. During 1997, we recorded a non-recurring asset impairment
    of $21.2 million. If the impairment had not occurred, the ratio of earnings
    to fixed charges would have equalled 2.1x. During the year ended December
    31, 1998, we incurred non-recurring expenses of $3.7 million primarily as a
    result of El Paso Energy's acquisition of our general partner in August
    1998, which caused us to be unable to fully cover the indicated fixed
    charges by $776,000. If the non-recurring expenses had not occurred, the
    ratio of earnings to fixed charges would have equalled 1.1x.

                                       30
<PAGE>   35

                      MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS


     You should read the following discussion in conjunction with (1) our
consolidated financial statements and the notes thereto beginning on page F-3 of
this prospectus and (2) the information set forth under the heading "Selected
Financial Data." The following discussion should assist your understanding of
our financial position and results of operations for the six months ended June
30, 1999 and 1998 and for each of the years ended December 31, 1998, 1997 and
1996. Unless the context otherwise requires, all references below to "we," "us"
or "our" are also references to our subsidiaries.


OVERVIEW


     We are primarily engaged in the gathering, transportation and production of
natural gas and crude oil in the Gulf. Through our subsidiaries and joint
ventures, we own interests in eight existing natural gas pipeline systems, an
oil pipeline system, six multi-purpose platforms, a dehydration facility, four
producing oil and natural gas properties and one non-producing oil and natural
gas property. In addition, we have recently completed the construction of a
wholly owned oil pipeline which we expect to become operational in the fourth
quarter of 1999 and, with our joint venture partners, we are constructing two
natural gas gathering systems.



     The natural gas pipelines, located primarily offshore Louisiana and
Mississippi, gather and transport natural gas for producers, marketers,
pipelines and end-users for a fee. Our current interests in the natural gas
pipelines consist of: 100% interest in each of Green Canyon and Tarpon; a 99.0%
interest in Viosca Knoll; a 50.0% interest in Stingray; a 60.0% interest in
HIOS; a 66.7% interest in UTOS; and an effective 25.7% interest in each of Manta
Ray Offshore and Nautilus. The natural gas pipelines include 1,200 miles of
pipeline with a throughput capacity of 6.8 Bcf of natural gas per day.


     We own a 36.0% interest in the Poseidon oil pipeline. The Poseidon oil
pipeline is located primarily offshore Louisiana and consists of approximately
300 miles of pipeline with a throughput capacity of 400.0 Mbbls of oil per day.

     We operate and own interests in six strategically-located, multi-purpose
platforms in the Gulf, including a 100% interest in five platforms -- Viosca
Knoll Block 817, East Cameron Block 373, Ship Shoal Block 332, South Timbalier
Block 292 and Ship Shoal Block 331 -- and a 50.0% interest in the Garden Banks
72 platform. These platforms have production handling capabilities which
complement our pipeline operations and play a key role in the development of oil
and natural gas reserves. We also own a 50.0% interest in West Cameron Dehy, a
dehydration and production handling facility located at the northern terminus of
the Stingray system, onshore Louisiana.


RECENT FINANCING DEVELOPMENTS



     PREFERENCE UNIT CONVERSION. Holders of approximately 71% of our remaining
outstanding preference units as of August 12, 1999 opted to convert those units
into common units by the expiration of our second 90 day conversion option
period, which commenced on May 14, 1999 and ended on August 12, 1999. During the
first conversion option period, during substantially the same period in 1998,
approximately 94% of our then outstanding preference units were converted into
common units. As a result of the completion of the second conversion option
period, a total of 291,299 preference units are outstanding.



     SUBORDINATED NOTES OFFERING. On May 27, 1999, we borrowed $175 million
pursuant to the issuance, at par, of Series A Senior Subordinated Notes (along
with the related indenture, the "subordinated notes"). These subordinated notes,
which were issued under an indenture, bear interest at a rate of 10 3/8% per
annum, payable semi-annually, mature on June 1, 2009, and are currently
guaranteed by all of our subsidiaries. For more information about our
subordinated notes, see "--Liquidity and Capital Resources--Sources of Cash."


                                       31
<PAGE>   36


     EXTENSION OF OUR CREDIT FACILITY. Concurrently with the closing of the
offering of our subordinated notes, we amended our $375.0 million revolving
credit facility to, among other things, extend the maturity to May 2002 from
December 1999. As of August 9, 1999, we had $300.0 million outstanding under the
revolving credit facility bearing interest at an average floating rate of 7.7%
per annum.



     NEW WESTERN GULF JOINT VENTURE CREDIT FACILITY. Western Gulf, which owns
HIOS and East Breaks, entered into a $100.0 million revolving credit facility in
February 1999 with a syndicate of commercial banks to fund substantially all of
the costs of the East Breaks system and other working capital needs of Western
Gulf, East Breaks and HIOS. This credit facility is secured by certain assets of
the joint venture and matures in February 2004. As of August 9, 1999, Western
Gulf had $50.1 million outstanding under its credit facility, bearing interest
at an average floating rate of 6.5% per annum, and $50.1 million of additional
availability under the facility. Including the 20% interest we recently acquired
from NGPL, we now own 60.0% of Western Gulf.



     TERMINATION OF VIOSCA KNOLL JOINT VENTURE CREDIT FACILITY. In connection
with our acquisition of substantially all of the interest that we did not
previously own in our Viosca Knoll joint venture, we repaid the balance
outstanding under and terminated the $100.0 million credit facility which that
joint venture had obtained in December 1996.


RESULTS OF OPERATIONS


  SIX MONTHS ENDED JUNE 30, 1999 COMPARED WITH SIX MONTHS ENDED JUNE 30, 1998



     Oil and natural gas sales totaled $15.1 million for the six months ended
June 30, 1999 as compared with $15.7 million for the same period in 1998. The
decrease is attributable to (1) substantially lower realized oil and natural gas
prices and (2) normal production declines from our oil and natural gas
properties, partially offset by production from properties we acquired in August
1998. During the six months ended June 30, 1999, we produced and sold 6,877 MMcf
of natural gas and 193.0 Mbbls of oil at average prices of $1.83 per Mcf and
$12.69 per barrel, respectively. During the same period in 1998, we produced and
sold 4,874 MMcf of natural gas and 308.0 Mbbls of oil at average prices of $2.16
per Mcf and $16.53 per barrel, respectively.



     Revenue from gathering, transportation and platform services totaled $8.3
million for the six months ended June 30, 1999, net of $2.4 million related to
the effect of consolidating Viosca Knoll's results beginning June 1, 1999, as
compared with $7.8 million for the same period in 1998. The increase of $0.5
million primarily reflects an increase of $2.7 million in platform services
revenue from our East Cameron Block 373 platform which was placed in service in
April 1998, offset by decreases of (1) $1.3 million in gathering revenue as a
result of lower throughput on the Green Canyon and Tarpon systems primarily due
to normal declines in production and (2) $0.9 million in platform services
revenue from our Viosca Knoll Block 817 platform as a result of lower third
party platform access fees because we acquired additional working interests in
the Viosca Knoll Block 817 property in August 1998.



     Revenue from our joint ventures totaled $20.0 million for the six months
ended June 30, 1999 as compared with $11.8 million for the same period in 1998
after taking out the effect of consolidating Viosca Knoll's results of
operations beginning June 1, 1999. The increase of $8.2 million primarily
reflects increases of (1) $0.8 million related to Stingray as a result of
reductions in prior period estimates for reserves for uncollectible revenues and
(2) $8.4 million from POPCO, West Cameron Dehy, Nautilus and Manta Ray Offshore
as a result of increased throughput offset by a decrease of $1.0 million as a
result of decreased throughput on HIOS and UTOS. Total natural gas throughput
volumes for our joint ventures increased approximately 3.0% from the six months
ended June 30, 1998 to the same period in 1999 primarily as a result of
increased throughput on the Viosca Knoll, Nautilus and Manta Ray Offshore
systems. Oil volumes from Poseidon totaled 29.5 MMbbls and 15.7 MMbbls for the
six months ended June 30, 1999 and 1998, respectively.



     Depreciation, depletion and amortization totaled $13.4 million for the six
months ended June 30, 1999 after taking out the effect of consolidating Viosca
Knoll's results of operations beginning on June 1, 1999


                                       32
<PAGE>   37


as compared with $14.8 million for the same period in 1998. The decrease of $1.4
million reflects a decrease of $1.8 million in depreciation and depletion of oil
and natural gas wells and facilities located on the Viosca Knoll Block 817,
Garden Banks Block 72 and the Garden Banks Block 117 as a result of decreased
depletion and abandonment accrual rates offset by $0.4 million of depreciation
on our East Cameron Block 373 and Ship Shoal Block 331 platforms placed in
service after March 31, 1998.



     General and administrative expenses, including the management fee allocated
from our general partner, totaled $5.9 million for the six months ended June 30,
1999 as compared with $7.5 million for the same period in 1998. The decrease of
$1.6 million reflects decreases of (1) $0.1 million in management fees allocated
by our general partner to us and (2) $1.5 million in our direct general and
administrative expenses in the 1998 period primarily related to the appreciation
and vesting of unit rights granted to certain of our officers and employees
under a compensation plan that was terminated in October 1998.



     Interest and other financing costs, excluding capitalized interest, for the
six months ended June 30, 1999 totaled $14.6 million as compared with $8.4
million for the same period in 1998. During the six months ended June 30, 1999
and 1998, we capitalized $0.8 million and $0.5 million, respectively, of
interest costs in connection with construction projects and drilling activities
in progress during such periods. During the six months ended June 30, 1999 and
1998, we had outstanding indebtedness under our credit facility averaging
approximately $332.0 million and $254.0 million, respectively, at average
interest rates of 7.3% and 6.5% per annum. Additionally, our subordinated notes,
issued in May 1999, bear interest at 10 3/8% per annum.



     Net income for the six months ended June 30, 1999 totaled $7.7 million, or
$0.25 per unit, as compared with $0.1 million, or $0.00 per unit, for the six
months ended June 30, 1998 as a result of the items discussed above.


    YEAR ENDED DECEMBER 31, 1998 COMPARED WITH YEAR ENDED DECEMBER 31, 1997

     Oil and natural gas sales totaled $31.4 million for the year ended December
31, 1998 as compared with $58.1 million for the same period in 1997. The
decrease is attributable to (1) substantially lower realized oil and natural gas
prices, (2) decreased production as a result of two tropical storms and
Hurricane Georges passing through the Gulf during the third quarter of 1998, (3)
normal production declines from our oil and natural gas properties and (4) the
lack of acceptable markets downstream of the Viosca Knoll system. The production
decline attributable to the capacity constraints of the downstream transporter
was alleviated during the third quarter of 1998. During the year ended December
31, 1998, we produced and sold 11,324 MMcf of natural gas and 540.0 Mbbls
barrels of oil at average prices of $2.01 per Mcf and $15.69 per barrel,
respectively. During the same period in 1997, we produced and sold 19,792 MMcf
of natural gas and 801.0 Mbbls barrels of oil at average prices of $2.08 per Mcf
and $20.61 per barrel, respectively.

     Revenue from gathering, transportation and platform services totaled $17.3
million for each of the years ended December 31, 1998 and 1997. The activity for
1998 remained consistent with the prior year as a result of an increase of $5.5
million in platform services revenue from our East Cameron Block 373 platform,
which was placed in service in April 1998, offset by decreases of (1) $2.8
million related to the cessation of production in May 1997 from the only well
connected to the Ewing Bank system, (2) $1.9 million as a result of lower
throughput on the Green Canyon system and the contribution of a significant
portion of the Manta Ray system to Manta Ray Offshore on January 17, 1997,
resulting in revenue from these assets being included in equity in earnings for
the entire year ended December 31, 1998 as compared with a portion of the year
ended December 31, 1997 and (3) $0.8 million in platform revenue services from
our Viosca Knoll Block 817 platform as a result of lower oil and natural gas
volumes processed on the platform due to capacity constraints of a downstream
transporter which were alleviated during the third quarter of 1998. Throughput
volumes for our wholly owned gathering systems decreased approximately 8.0% for
the year ended December 31, 1998 as compared with the same period in 1997.

     Revenue from our joint ventures totaled $26.7 million for the year ended
December 31, 1998 as compared with $29.3 million for the same period in 1997.
The decrease of $2.6 million primarily reflects

                                       33
<PAGE>   38

decreases of (1) $6.7 million related to non-recurring start-up costs, changes
in prior period estimates and a change in equity ownership of Nautilus and Manta
Ray Offshore and (2) $2.5 million related to Stingray and HIOS as a result of
increased maintenance costs and decreased throughput offset by an increase of
$6.6 million from Poseidon, Viosca Knoll, UTOS and West Cameron Dehy as a result
of increased throughput. Total natural gas throughput volumes for our joint
ventures increased approximately 20.0% from the year ended December 31, 1997 to
the same period in 1998 primarily as a result of increased throughput on the
Viosca Knoll, UTOS, Nautilus and Manta Ray Offshore systems. Oil volumes from
Poseidon totaled 35.6 MMbbls and 19.0 MMbbls for the year ended December 31,
1998 and 1997, respectively. Our joint ventures were impacted by two tropical
storms and Hurricane Georges passing through the Gulf during the third quarter
of 1998.

     Operating expenses totaled $11.4 million for each of the years ended
December 31, 1998 and 1997. The 1998 activity remained consistent with the prior
year as a result of lower operating and transportation costs associated with our
oil and natural gas properties offset by higher operating costs associated with
the East Cameron Block 373 platform placed in service in April 1998, the
acquisition of the Ship Shoal Block 331 platform in August 1998 and additional
activities associated with the Ship Shoal Block 332 platform.

     Depreciation, depletion and amortization totaled $29.3 million for the year
ended December 31, 1998 as compared with $46.3 million for the same period in
1997. The decrease of $17.0 million reflects decreases of (1) $14.0 million in
depreciation and depletion on oil and natural gas wells and facilities located
on the Viosca Knoll Block 817, Garden Banks Block 72 and the Garden Banks Block
117 as a result of decreased production from these leases and slightly lower
estimated abandonment obligations and (2) $3.0 million in depreciation on
pipelines, platforms and facilities as a result of us fully depreciating our
investment in the Ewing Bank and Ship Shoal systems in June 1997, offset by
increased depreciation attributable to our East Cameron Block 373 and Ship Shoal
Block 331 platforms placed in service in 1998.

     Impairment, abandonment and other totaled ($1.1 million) for the year ended
December 31, 1998 and represented the excess of accrued costs over actual costs
incurred associated with the abandonment of our Ewing Bank flowlines.
Impairment, abandonment and other totaled $21.2 million for the year ended
December 31, 1997 and consisted of a non-recurring charge to reserve our
investment in certain gathering facilities and other assets associated with
Tatham Offshore's Ewing Bank 914 #2 well and Ship Shoal Block 331 property, to
accrue our abandonment obligations associated with the gathering facilities
serving these properties, to reserve our noncurrent receivable related to the
prepayment of the demand charge obligations under certain agreements related to
the Ewing Bank and Ship Shoal leases and to accrue certain abandonment
obligations associated with its oil and natural gas properties.

     General and administrative expenses, including the management fee allocated
from our general partner, totaled $16.2 million for the year ended December 31,
1998 as compared with $14.7 million for the same period in 1997. The increase of
$1.5 million reflects increases of (1) $1.0 million in management fees allocated
by our general partner to us as a result of our increased construction and
operational activities and (2) $0.5 million in our direct general and
administrative expenses primarily related to the vesting and appreciation of
unit rights to certain of our officers and employees.

     Interest income and other totaled $0.8 million for the year ended December
31, 1998 as compared with $1.5 million for the same period in 1997.

     Interest and other financing costs, excluding capitalized interest, for the
year ended December 31, 1998 totaled $20.2 million as compared with $14.2
million for the same period in 1997. During the year ended December 31, 1998 and
1997, we capitalized $1.1 million and $1.7 million, respectively, of interest
costs in connection with construction projects and drilling activities in
progress during such periods. During the years ended December 31, 1998 and 1997,
we had outstanding indebtedness averaging approximately $288.0 million and
$232.5 million, respectively.

                                       34
<PAGE>   39

     Net income for the year ended December 31, 1998 totaled $0.7 million, or
$0.02 per unit, as compared with a net loss of $1.1 million, or $0.06 per unit,
for the year ended December 31, 1997 as a result of the items discussed above.

    YEAR ENDED DECEMBER 31, 1997 COMPARED WITH YEAR ENDED DECEMBER 31, 1996

     Oil and natural gas sales totaled $58.1 million for the year ended December
31, 1997 as compared with $47.1 million for the year ended December 31, 1996.
The increase of $11.0 million is attributable to increased production from our
oil and natural gas properties as a result of initiating full production from
Viosca Knoll Block 817 in March 1996, Garden Banks Block 72 in May 1996 and
Garden Banks Block 117 in July 1996. During the year ended December 31, 1997, we
produced and sold 19,792 MMcf of natural gas and 801.0 Mbbls of oil at average
prices of $2.08 per Mcf and $20.61 per barrel, respectively. During 1996, we
produced and sold 15,730 MMcf of natural gas and 393.0 Mbbls of oil at average
prices of $2.37 per Mcf and $21.76 per barrel, respectively.

     Revenue from gathering, transportation and platform services totaled $17.3
million for the year ended December 31, 1997 as compared with $24.0 million for
the year ended December 31, 1996. The decrease of $6.7 million reflects
decreases of (1) $7.6 million as a result of the contribution of a significant
portion of the Manta Ray system to Manta Ray Offshore in January 1997 resulting
in revenue from these assets being included in equity in earnings for the
remainder of the year ended December 31, 1997 and (2) $3.0 million related to
lower throughput on the Ewing Bank system offset by increases of (1) $1.8
million in platform services from our Viosca Knoll Block 817 platform as a
result of additional oil and natural gas volumes processed on the platform and
(2) $2.1 million from the Tarpon and Green Canyon systems primarily related to
(x) the deregulation of the Tarpon system allowing us to recognize additional
revenue during the current period related to the gathering fees collected in
prior periods and (y) new production attached to these systems. Throughput
volumes for our wholly owned gathering systems decreased 34.0% for the year
ended December 31, 1997 as compared with the year ended December 31, 1996
primarily due to an 82.0% decline from the Ewing Bank system due to a downhole
mechanical problem in May 1997 which caused Tatham Offshore's Ewing Bank 914 #2
well to be shut-in.

     Revenue from our joint ventures totaled $29.3 million for the year ended
December 31, 1997 as compared with $20.4 million for the year ended December 31,
1996. The increase of $8.9 million primarily reflects increases of (1) $2.9
million from Viosca Knoll and UTOS as a result of increased throughput, (2) $1.6
million from Poseidon, which placed the Poseidon system in service in
three-phases, April 1996, December 1996 and December 1997, (3) $0.4 million from
West Cameron Dehy, (4) $3.7 million from Manta Ray Offshore related to the Manta
Ray assets contributed by Leviathan and (5) $2.2 million from Nautilus,
primarily as a result of Nautilus recognizing as other income an allowance for
funds used during construction, offset by (6) a $1.9 million decrease in
Stingray and HIOS as a result of increased maintenance costs during 1997. Total
natural gas throughput volumes for our joint ventures increased approximately
9.0% from 1996 to 1997 primarily as a result of increased throughput on the
Viosca Knoll and UTOS systems as well as the addition of the Manta Ray Offshore
system throughput as a joint venture, as discussed above. Oil volumes from
Poseidon totaled 19.0 MMbbls for the year ended December 31, 1997 as compared
with 7.5 MMbbls for the period from inception of operations in April 1996
through December 31, 1996.

     Operating expenses for the year ended December 31, 1997 totaled $11.4
million as compared with $9.1 million for the year ended December 31, 1996. The
increase of $2.3 million is primarily attributable to additional maintenance
costs related to the platforms we operate and our operation of one additional
oil and natural gas well during 1997.

     Depreciation, depletion and amortization totaled $46.3 million for the year
ended December 31, 1997 as compared with $31.7 million for the year ended
December 31, 1996. The increase of $14.6 million reflects an increase of $19.7
million in depreciation and depletion on the oil and natural gas wells and
facilities located on Viosca Knoll Block 817, Garden Banks Block 72 and Garden
Banks Block 117 as a result of increased production from these leases which
initiated production in December 1995, May 1996

                                       35
<PAGE>   40

and July 1996, respectively, offset by a decrease of $5.1 million in
depreciation on pipelines, platforms and facilities.

     Impairment, abandonment and other totaled $21.2 million for the year ended
December 31, 1997 and consisted of a non-recurring charge to reserve our
investment in certain gathering facilities and other assets associated with
Tatham Offshore's Ewing Bank 914 #2 well and Ship Shoal Block 331 property, to
accrue our abandonment obligations associated with the gathering facilities
serving these properties, to reserve our noncurrent receivable related to the
prepayment of the demand charge obligations under certain agreements related to
the Ewing Bank and Ship Shoal leases and to accrue certain abandonment
obligations associated with its oil and natural gas properties.

     General and administrative expenses, including the management fee allocated
from our general partner, totaled $14.7 million for the year ended December 31,
1997 as compared with $8.5 million for the year ended December 31, 1996. General
and administrative expenses for the year ended December 31, 1996 were reduced by
a one-time $1.4 million reimbursement from Poseidon as a result of our
management of the initial construction of Poseidon. Excluding this one-time
reimbursement by Poseidon, general and administrative expenses for the year
ended December 31, 1997 increased $4.7 million as compared to the year ended
December 31, 1996. This increase reflects (1) a $1.5 million increase in
management fees allocated by our general partner to us as a result of our
increased construction and operational activities, (2) a $3.6 million increase
in our direct general and administrative expenses primarily related to the
appreciation and vesting of unit appreciation rights granted to certain officers
and employees in 1995, 1996 and 1997 and (3) a $0.4 million decrease in the
reimbursement to El Paso Energy for certain tax liabilities pursuant to the
management agreement with us.

     Interest income and other totaled $1.5 million for the year ended December
31, 1997 as compared with $1.7 million for the year ended December 31, 1996.

     Interest and other financing costs, excluding capitalized interest, for the
year ended December 31, 1997 totaled $14.2 million as compared with $5.6 million
for the year ended December 31, 1996. During the years ended December 31, 1997
and 1996, we capitalized $1.7 million and $11.9 million, respectively, of
interest costs in connection with construction projects and drilling activities
in progress during such periods. During the years ended December 31, 1997 and
1996, we had outstanding indebtedness averaging approximately $232.5 million and
$181.4 million, respectively.

     Net loss for the year ended December 31, 1997 totaled $1.1 million, or
$0.06 per unit, as compared with net income of $38.7 million, or $1.57 per unit,
for the year ended December 31, 1996 as a result of the items discussed above.

LIQUIDITY AND CAPITAL RESOURCES


     SOURCES OF CASH. We intend to satisfy our capital requirements and other
working capital needs primarily from cash on hand, cash from operations and
borrowings under our revolving credit facility (discussed below). However,
depending on market and other factors, we may issue additional equity to raise
cash or acquire assets, as in the acquisition of the additional interest in
Viosca Knoll. Net cash provided by operating activities for the year ended
December 31, 1998 and for the six months ended June 30, 1999 totaled $25.7
million and $23.6 million, respectively. In addition to funds available under
our credit facility or from the issuance of equity, we may use debt securities
to raise cash to fund our working capital requirements, such as the cash portion
of the Viosca Knoll transaction and to repay borrowings under Viosca Knoll's
credit facility. At June 30, 1999, we had cash and cash equivalents of $3.3
million.



     Cash from operations is derived from (1) payments for gathering natural gas
through our 100% owned pipelines, (2) platform access and production handling
fees, (3) cash distributions from our joint ventures and (4) the sale of oil and
natural gas attributable to our interest in our producing properties. Oil and
natural gas properties are depleting assets and will produce reduced volumes of
oil and natural gas in the future unless additional wells are drilled or
recompletions of existing wells are successful. See "Business -- Oil and Natural
Gas Properties" beginning on page 57 for current rates from our properties.

                                       36
<PAGE>   41


     Our cash flows from operations will be affected by the ability of each of
our joint ventures to make distributions. Distributions from such entities are
also subject to the discretion of their respective management committees.
Further, each of Stingray, Poseidon and Western Gulf is party to a credit
agreement under which it has outstanding obligations that may restrict the
payments of distributions to its owners. We received distributions from our
joint ventures during the year ended December 31, 1998 and for the six months
ended June 30, 1999 totaling $31.2 million and $24.1 million, respectively.



     We entered into an indenture dated May 27, 1999 with Chase Bank of Texas,
National Association, pursuant to which we issued $175 million in aggregate
principal amount of our subordinated notes. We capitalized $5.2 million of debt
issue costs related to the issuance of the subordinated notes. The subordinated
notes bear interest at a rate of 10 3/8% per annum, payable semi-annually, on
June 1 and December 1, mature on June 1, 2009 and are junior to substantially
all of our other indebtedness other than trade payables and indebtedness that by
its terms expressly states it is equal or junior to the subordinated notes.
Generally, we do not have the right to prepay the subordinated notes prior to
May 31, 2004, and thereafter, we may prepay the subordinated notes at a premium
of 5% of the face amount, which premium declines ratably through maturity.
Although the subordinated notes are unsecured, all of our subsidiaries have
guaranteed those obligations. The subordinated notes contain customary terms and
conditions, including various affirmative and negative covenants and the
obligation to offer to repurchase the notes at a premium under certain
circumstances. Among other things, the terms of the subordinated notes limit our
ability to make distributions to our unitholders, redeem or otherwise reacquire
any of our equity, incur additional indebtedness, incur or permit to exist
certain liens, make additional investments, engage in transactions with
affiliates, engage in certain types of businesses and dispose of assets under
certain circumstances, including if certain financial tests are not satisfied or
there is a default. In addition, we will be obligated to offer to repurchase the
subordinated notes if we experience certain types of changes of control or if we
dispose of certain assets and do not reinvest the proceeds or repay senior
indebtedness.



     We currently have a revolving credit facility providing for up to $375.0
million of available credit, subject to customary terms and conditions,
including certain limitations on incurring additional indebtedness (including
borrowings under this facility) if certain financial targets are not achieved
and maintained. In addition, we will be required to prepay a portion of the
balance outstanding under our credit facility to the extent such financial
targets are not achieved and maintained. We may borrow money under the credit
agreement for general partnership purposes, including financing capital
expenditures, working capital requirements, and, subject to certain limitations,
distributions to our unitholders. We may also utilize this credit facility to
issue letters of credit as may be required from time to time; however, no
letters of credit are currently outstanding. Concurrently with the closing of
the offering of the Series A notes, we amended our facility to, among other
things, extend the maturity to May 2002 from December 1999. Our revolving credit
facility is guaranteed by the general partner and each of our subsidiaries and
is collateralized by (1) the management agreement between the general partner
and a subsidiary of El Paso Energy, (2) substantially all of our assets and (3)
the general partner's 1.0% general partner interest in us and approximate 1.0%
nonmanaging interest in certain of our subsidiaries. Our revolving credit
facility has no scheduled amortization prior to maturity. As of August 9, 1999,
we had $300.0 million outstanding under our revolving credit facility bearing
interest at an average floating rate of 7.7% per annum and approximately $44.5
million of funds are available under the facility. We used all otherwise
unapplied proceeds from the offering of the Series A notes (approximately $112.3
million) to temporarily reduce the balance outstanding under our credit
facility, and we borrowed approximately $51.0 million on June 30, 1999 under
this facility in connection with closing HIOS/East Breaks/UTOS acquisition.



     Poseidon has a revolving credit facility with a syndicate of commercial
banks to provide up to $150.0 million for other working capital needs of
Poseidon. Poseidon's ability to borrow money under the facility is subject to
certain customary terms and conditions, including certain limitations on
incurring additional indebtedness (including borrowings under this credit
facility) if certain financial targets are not achieved and maintained. In
addition, Poseidon will be required to prepay a portion of the balance
outstanding under this credit facility to the extent such financial targets are
not achieved and maintained. The Poseidon credit facility has no scheduled
amortization prior to maturity. The Poseidon credit facility is collateralized
by a substantial portion of Poseidon's assets and matures on April 30, 2001. As
of August 9,

                                       37
<PAGE>   42


1999, Poseidon had $140.0 million outstanding under its credit facility bearing
interest at an average floating rate of 6.5% per annum and had approximately
$10.0 million of additional funds available under the facility.



     Stingray has an existing term loan agreement with a syndicate of commercial
banks which matures on March 31, 2003. The agreement requires Stingray to make
18 quarterly principal payments of approximately $1.6 million commencing
December 31, 1998. The term loan agreement is principally collateralized by
current and future natural gas transportation contracts between Stingray and its
customers. On the earlier to occur of March 31, 2003 or the accelerated due date
pursuant to the Stingray credit agreement, if Stingray has not paid all amounts
due under its credit agreement, we are obligated to pay the lesser of (1) $8.5
million, (2) the aggregate amount of distributions received by us from Stingray
subsequent to January 1, 1998 or (3) 50.0% of any then outstanding amounts due
pursuant to the Stingray credit agreement. We do not expect to have to pay any
amount pursuant to this obligation. As of August 9, 1999, Stingray had $23.7
million outstanding under its term loan agreement bearing interest at an average
floating rate of 6.3% per annum.



     Western Gulf, which owns all of HIOS and East Breaks, entered into a
revolving credit facility with a syndicate of commercial banks in February 1999
to provide up to $100.0 million for the construction of the East Breaks system
and for other working capital needs of Western Gulf, East Breaks and HIOS.
Western Gulf's ability to borrow money under the facility is subject to certain
customary terms and conditions, including certain limitations on incurring
additional indebtedness (including borrowings under this credit facility) if
certain financial targets are not achieved and maintained. In addition, Western
Gulf would be required to prepay a portion of the balance outstanding under this
credit facility to the extent such financial targets are not achieved and
maintained. The credit facility has no scheduled amortization prior to its
maturity in February 2004. The Western Gulf credit facility is collateralized by
Western Gulf's ownership interest in HIOS and East Breaks and substantially all
of the material contracts and agreements of East Breaks and Western Gulf, and
supported by the guarantee of East Breaks. In addition, we have agreed to return
up to $3.0 million in distributions paid to us by Western Gulf under certain
circumstances. As of August 9, 1999, Western Gulf had $50.1 million outstanding
under this credit facility bearing interest at a floating rate of 6.5% per annum
and had approximately $49.9 million of additional funds available under this
facility. See "Business -- Recent Developments, Acquisitions and New
Projects -- UTOS/HIOS/East Breaks Acquisition, Joint Venture Restructuring and
East Breaks Pipeline Construction" beginning on page 46.



     Prior to the closing of the offering of the Series A notes, Viosca Knoll
had a revolving credit facility with a syndicate of commercial banks to provide
up to $100.0 million for other working capital needs of Viosca Knoll, which we
repaid in full and terminated on June 1, 1999 in connection with our acquisition
of an additional 49.0% in Viosca Knoll from El Paso Energy. See "Description of
Other Indebtedness -- Joint Venture Credit Arrangements."



     In connection with the Viosca Knoll transactions on June 1, 1999, our
general partner contributed approximately $0.6 million to us in order to
maintain its 1.0% capital account balance as required by our partnership
agreement.



     USES OF CASH. Our primary capital requirements are (1) quarterly
distributions to holders of preference units and common units and to the general
partner, including incentive distributions, as applicable, (2) expenditures for
the maintenance of our pipelines and related infrastructure and the acquisition
and construction of additional energy-related infrastructure, (3) expenditures
related to our producing oil and natural gas properties, (4) expenditures
relating to the development of our non-producing property, the Ewing Bank 958
Unit, (5) administrative expenses (including management fees) and other
operating expenses, (6) contributions to our joint ventures as required to fund
capital expenditures for new facilities, (7) debt service on our outstanding
indebtedness, including temporarily reducing the balance outstanding under our
revolving credit facility with approximately $112.3 million of proceeds from the
offering of the Series A notes, (8) repaying the balance outstanding under the
Viosca Knoll credit facility and (9) acquiring the additional interests in
UTOS/HIOS/East Breaks.


                                       38
<PAGE>   43


     During the year ended December 31, 1998 and the six months ended June 30,
1999, we paid distributions to our partners totaling $62.4 million and $31.3
million, respectively, including $11.1 million and $5.6 million to our general
partner as incentive distributions. On July 19, 1999, we declared our second
quarter cash distribution of $0.275 per preference unit and $0.525 per common
unit covering the three months ended June 30, 1999. The distributions were paid
on August 13, 1999 to all holders of record of common and preference units at
the close of business on July 30, 1999. In April 1999, we declared our first
quarter cash distribution of $0.275 per preference unit and $0.525 per common
unit for the period from January 1, 1999 through March 31, 1999 which was paid
on May 14, 1999 to all holders of record of preference units and common units as
of April 30, 1999. We believe that we will be able to continue to pay at least
the current quarterly distributions of $0.275 per preference unit and $0.525 per
common unit for the foreseeable future. At these distribution rates, the
quarterly distributions total $17.4 million in respect of the preference units,
common units and general partner interest. Distributions of our available cash
are effectively made 98.0% to unitholders and 2.0% to the general partner,
subject to the payment of incentive distributions.



     In April 1998, we completed the construction and installation of a new
platform and production handling facilities at East Cameron Block 373 at a cost
of $30.2 million, $9.4 million of which was incurred in 1998. See
"Business -- Offshore Platforms and Other Facility -- East Cameron Block 373"
beginning on page 55.



     During 1998, we paid $2.9 million related to the abandonment of the Ewing
Bank flowlines and $8.6 million to our management in connection with the
accelerated vesting of the unit rights discussed in "Management -- Executive
Compensation -- Unit Rights Appreciation Plan" beginning on page 73.



     Substantially all of the capital expenditures by Poseidon, East Breaks,
Viosca Knoll and Stingray were funded by borrowings under separate joint venture
credit facilities, and any future capital expenditures by East Breaks, Poseidon,
HIOS and Stingray are anticipated to be funded by borrowings under such credit
facilities. As previously discussed, we repaid in full ($66.7 million) and
terminated Viosca Knoll's credit facility upon the closing of the Viosca Knoll
transaction. Our cash capital expenditures (including construction and
installation of the Allegheny oil pipeline and development costs of the Ewing
Bank 958 Unit) and equity investments and acquisitions for the year ended
December 31, 1998 and for the six months ended June 30, 1999 were $66.1 million
and $92.8 million, respectively. We have in the past contributed existing assets
to joint ventures as partial consideration for ownership interest therein and
may in the future contribute existing assets, including cash, to new joint
ventures as partial consideration for ownership interest.



     Interest costs incurred by us totaled $19.2 million and $14.6 million,
respectively, for the year ended December 31, 1998 and for the six months ended
June 30, 1999. We capitalized $1.1 million and $0.8 million, respectively, of
such interest costs in connection with construction projects and drilling
activities in process during such periods.



     On June 1, 1999, we closed our acquisition of an additional 49.0% interest
in Viosca Knoll, for which $19.9 million of the consideration paid was cash. On
June 30, 1999, we paid approximately $51.0 million in connection with the
acquisition of the additional interests in Western Gulf and UTOS.



     We anticipate that our capital expenditures and equity investments for 1999
will relate to continuing acquisition, construction and development activities,
including the completion of the Allegheny oil pipeline, the construction of the
Nemo pipeline and the development of the Ewing Bank 958 Unit. We anticipate
funding such cash requirements primarily with available cash flow, borrowings
under our credit facility and, depending on the capital requirements and related
market conditions, issuing additional debt and/or equity. Further, with respect
to the development of the Ewing Bank 958 Unit as currently planned, we
anticipate consummating an exchange, sale, farmout, joint venture or similar
arrangement to share in the drilling and infrastructure costs associated with
that development. If we do not make such an arrangement, we will have to raise
additional capital through another source or we will not be able to proceed with
this development as currently planned. We cannot assure you that any such source
of capital would be available to complete this development.

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<PAGE>   44

NEW ACCOUNTING STANDARDS

     REPORTING ON THE COSTS OF START-UP ACTIVITIES. In April 1998, the American
Institute of Certified Public Accountants issued Statement of Position 98-5,
"Reporting on the Costs of Start-Up Activities." This statement defines start-up
activities, requires start-up and organization costs to be expensed as incurred
and requires that any such costs that exist on the balance sheet be expensed
upon adoption of this pronouncement. We adopted the provisions of this statement
on January 1, 1999, the impact of which was not material to our financial
position or results of operations.


     ACCOUNTING FOR DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES. In June 1998,
the Financial Accounting Standards Board issued Statement of Financial
Accounting Standard ("SFAS") No. 133, "Accounting for Derivative Instruments and
Hedging Activities." SFAS No. 133 requires that entities recognize all
derivative investments as either assets or liabilities on the balance sheet and
measure those instruments at fair value. Changes in the fair value of
derivatives are recorded each period in current earnings or other comprehensive
income, depending on whether a derivative is designated as a hedge transaction.
For fair-value hedge transactions in which we are hedging changes in an asset's,
liability's or firm commitment's fair value, changes in the fair value of the
derivative instrument will generally be offset in the income statement by
changes in the hedged item's fair value. For cash-flow hedge transactions, in
which we are hedging the variability of cash flows related to a variable-rate
asset, liability, or a forecasted transaction, changes in the fair value of the
derivative instrument will be reported in other comprehensive income. The gains
and losses on the derivative instrument that are reported in other comprehensive
income will be reclassified as earnings in the periods in which earnings are
impacted by the variability of the cash flows of the hedged item. The
ineffective portion of all hedges will be recognized in current-period earnings.
This statement was amended by SFAS No. 137 issued in June 1999. The amendment
defers the effective date of SFAS No. 133 to fiscal years beginning after June
15, 2000. We have not yet determined the impact that the adoption of SFAS No.
133 will have on our financial position or results of operations.


     ACCOUNTING FOR CONTRACTS INVOLVED IN ENERGY TRADING AND RISK MANAGEMENT
ACTIVITIES. In November 1998, the Emerging Issues Task Force ("EITF") reached a
consensus on EITF 98-10, "Accounting for Contracts Involved in Energy Trading
and Risk Management Activities." EITF 98-10 requires energy trading contracts to
be recorded at fair value on the balance sheet, with the changes in fair value
included in earnings and is effective for fiscal years beginning after December
15, 1998. We adopted the provisions of EITF 98-10 effective January 1, 1999, the
resulting impact of which did not have a material impact on our financial
position or results of operations.

QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

     We may utilize derivative financial instruments for purposes other than
trading to manage our exposure to movements in interest rates and commodity
prices. In accordance with procedures established by our Board of Directors, we
monitor current economic conditions and evaluate our expectations of future
prices and interest rates when making decisions with respect to risk management.


     INTEREST RATE RISK. We utilize both fixed and variable rate long-term debt.
We are exposed to some market risk due to the floating interest rate under our
credit facility. Under our credit facility, the remaining principal and the
final interest payments are due in March 2002. As of August 9, 1999,
indebtedness outstanding under our credit facility was $300.0 million at an
average interest rate of 7.7% per annum. A 1 1/2% increase in interest rates
could result in a $4.5 million annual increase in interest expense on the total
existing principal balance. We are exposed to similar risk under the credit
facilities and loan agreements entered into by our joint ventures. See
"-- Liquidity and Capital Resources." We have determined that it is not
necessary to participate in interest rate-related derivative financial
instruments because we currently do not expect significant short-term increases
in the interest rates charged under our credit facility or the various joint
venture credit facilities and loan agreements.


     COMMODITY PRICE RISK. We hedge a portion of our oil and natural gas
production to reduce our exposure to fluctuations in the market prices thereof.
We use commodity price swap transactions whereby monthly settlements are based
on differences between the prices specified in the commodity price swap
agreements and the settlement prices of certain futures contracts quoted on the
New York Mercantile

                                       40
<PAGE>   45


Exchange ("NYMEX") or certain other indices. We settle the commodity price swap
transactions by paying the negative difference or receiving the positive
difference between the applicable settlement price and the price specified in
the contract. The commodity price swap transactions we use differ from futures
contracts in that there are no contractual obligations which require or allow
for the future delivery of the product. The credit risk from our price swap
contracts is derived from the counter-party to the transaction, typically a
major financial institution. We do not require collateral and do not anticipate
non-performance by this counter-party, which does not transact a sufficient
volume of transactions with us to create a significant concentration of credit
risk. Gains or losses resulting from hedging activities and the termination of
any hedging instruments are initially deferred and included as an increase or
decrease to oil and natural gas sales in the period in which the hedged
production is sold. For the six months ended June 30, 1999, we recorded a net
loss of $0.7 million related to hedging activities.



     As of June 30, 1999, we had open sales swap transactions for 10,000 MMbtu
of natural gas per day for calendar 2000 at a fixed price to be determined at
our option equal to the February 2000 Natural Gas Futures Contract on NYMEX as
quoted at any time during 1999 and January 2000, to and including the last two
trading days of the February 2000 contract, minus $0.5450 per MMbtu.
Additionally, we had open sales swap transactions of 10,000 MMbtu of natural gas
per day at a fixed price to be determined at our option equal to the January
2000 Natural Gas Futures Contract on NYMEX as quoted at any time during 1999, to
and including the last two trading days of the January 2000 contract, minus
$0.50 per MMbtu.



     At June 30, 1999, we had open crude oil hedges on approximately 500 barrels
per day for the remainder of calendar 1999 at an average price of $16.10 per
barrel.



     If we had settled our open natural gas hedging positions as of June 30,
1999 based on the applicable settlement prices of the NYMEX futures contracts,
we would have recognized a loss of approximately $2.2 million.


YEAR 2000

     The Year 2000 issue is the result of computer programs that were written
using two digits rather than four to define the year. We have established a
project team that works with the El Paso Energy executive steering committee to
coordinate the phases of our Year 2000 project to ensure that our key automated
systems and related processes will remain functional through Year 2000. Those
phases include: (1) awareness, (2) assessment, (3) remediation, (4) testing, (5)
implementation of the necessary modifications and (6) contingency planning
(which was previously included as a component of our implementation phase). We
have hired outside consultants and are involved in several industry trade-
groups to supplement our project team.

     The awareness phase recognizes the importance of Year 2000 issues and its
potential impact on us. Through the project team, we have established an
awareness program which includes participation of management in each business
area. The awareness phase is substantially completed, although we will
continually update awareness efforts for the duration of the Year 2000 project.

     The assessment phase consists of conducting an inventory of our key
automated systems and related processes, analyzing and assigning levels of
criticality to those systems and processes, identifying and prioritizing
resource requirements, developing validation strategies and testing plans, and
evaluating business partner relationships. We estimate that we are more than
three-quarters complete with the portion of the assessment phase to determine
the nature and impact of the Year 2000 date change for hardware and equipment,
embedded chip systems, and third-party developed software. The assessment phase
of the project involves, among other things, efforts to obtain representations
and assurances from third parties, including joint ventures, partners, customers
and vendors, that their hardware and equipment products, embedded chip systems
and software products being used by or impacting us are or will be modified to
be Year 2000 compliant. To date, the responses from such third parties, although
generally encouraging, are inconclusive. Although we intend to interact only
with those third parties that have Year 2000 compliant computer systems, it is
impossible for us to monitor all such systems. As a result, we cannot predict
the potential consequences if our joint ventures, partners, customers or vendors
are not Year 2000 compliant. We are currently evaluating the exposure associated
with such business partner relationships.
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<PAGE>   46


     The remediation phase involves converting, modifying, replacing or
eliminating selected key automated systems identified in the assessment phase.
The testing phase involves the validation of the identified key automated
systems. We are utilizing test tools and written procedures to document and
validate, as necessary, its unit, system, integration and acceptance testing.
The implementation phase involves placing the converted or replaced key
automated systems into operations. In some cases, the implementation phase will
also involve the implementation of contingency plans needed to support business
functions and processes that may be interrupted by Year 2000 failures that are
outside our control. As of August 9, 1999, we are substantially completed with
each phase.



     The contingency planning phase consists of developing a risk profile of our
critical business processes and then providing for actions we will pursue to
keep such processes operational in the event of Year 2000 disruptions. The focus
of such contingency planning is on prompt response to Year 2000 events, and a
plan for subsequent resumption of normal operations. The plan is expected to
assess the risk of significant failure to critical processes performed by us,
and to address the mitigation of those risks. The plan will also consider any
significant failures in the event the most reasonably likely worst case scenario
develops, as discussed below. In addition, the plan is expected to factor in the
severity and duration of the impact of a significant failure. As of August 9,
1999, the contingency plan was substantially completed. This Year 2000
contingency plan will continue to be modified and adjusted through the year as
additional information from key external business partners becomes available.


     Our goal is to ensure that all of our critical systems and processes that
are under our direct control remain functional. However, certain systems and
processes may be interrelated with or dependent upon systems outside our control
and systems within our control may have unpredicted problems. Accordingly, there
can be no assurance that significant disruptions will be avoided. Our present
analysis of our most reasonably likely worst case scenario for Year 2000
disruptions includes Year 2000 failures in the telecommunications and
electricity industries, as well as interruptions from suppliers that might cause
disruptions in our operations, thus causing temporary financial losses and an
inability to meet our obligations to customers. A significant portion of the oil
and natural gas transported through our pipelines is owned by third parties.
Accordingly, failures of the producers of oil and natural gas to be ready for
the Year 2000 could significantly disrupt the flow of the hydrocarbons for
customers. In many cases, the producers have no direct contractual relationship
with us, and we rely on our customers to verify the Year 2000 readiness of the
producers from whom they purchase oil and natural gas. A portion of our revenue
for the transportation of oil and natural gas is based upon fees paid by our
customers for the reservation of capacity and a portion of the revenue is based
upon the volume of actual throughput. As such, short-term disruptions in
throughput caused by factors beyond our control may have a financial impact on
us and could cause operational problems for our customers. Longer-term
disruptions could materially impact our operations, financial condition and cash
flows.


     We estimate that the costs to be incurred in 1999 and 2000 associated with
assessing, remediating and testing hardware and equipment, embedded chip
systems, and third-party developed software will not exceed $1.0 million, all of
which will be expensed. As of June 30, 1999, we had incurred less than $0.1
million related to such costs. We have previously only tracked incremental
expenses related to our Year 2000 project. The costs of the Year 2000 project
related to salaried employees of El Paso Energy, including their direct salaries
and benefits, are not available and have not been included in the estimated
costs of the project. The management fee charged to us by the general partner
includes such incremental expenses.


     Presently, we intend to reassess our estimate of Year 2000 costs in the
event we complete an acquisition of, or make a material investment in,
substantial facilities or another business entity.

     Management does not expect the costs of our Year 2000 project will have a
material adverse effect on our financial position, results of operations or cash
flows. However, based on information available at this time, we cannot conclude
that disruption caused by internal or external Year 2000 related failures will
not adversely effect us. Specific factors which may affect the success of our
Year 2000 efforts and the frequency or severity of Year 2000 disruption or
amount of any expense include failure by us or our outside consultants to
properly identify deficient systems, the failure of the selected remedial action
to

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<PAGE>   47

adequately address the deficiencies, the failure by us or our outside
consultants to complete the remediation in a timely manner (due to shortages of
qualified labor or other factors), the failure of other parties to joint
ventures in which we are involved to meet their obligations, both financial and
operational under the relevant joint venture agreements to remediate assets used
by the joint venture, unforeseen expenses related to the remediation of existing
systems or the transition to replacement systems, and the failure of third
parties, including joint ventures, to become Year 2000 compliant or to
adequately notify us of potential noncompliance.

     The above disclosure is a "Year 2000 Readiness Disclosure" made with the
intention to comply fully with the Year 2000 Information and Readiness
Disclosure Act of 1998, Pub. L. No. 105-271, 112 Stat, 2386, signed into law
October 19, 1998. All statements made herein shall be construed within the
confines of the Act. To the extent that any reader of this Year 2000 Readiness
Disclosure is other than an investor or potential investor in our or an
affiliate's equity or debt securities, this disclosure is made for the sole
purpose of communicating or disclosing information aimed at correcting, helping
to correct and/or avoiding Year 2000 failures.

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<PAGE>   48

                                    BUSINESS

OVERVIEW


     We are a provider of integrated energy services, including natural gas and
oil gathering, transportation, midstream and other related services in the Gulf.
We commenced operations in 1989, through a predecessor company, with the
objective of becoming a major natural gas gatherer and transporter in the Gulf,
with specific focus on the emerging Deepwater, and identifying and exploiting
other energy-related opportunities. When we completed our initial public
offering in 1993, we owned interests in seven pipeline systems, which extended
approximately 721 miles and had a design capacity of 5.0 Bcf of natural gas per
day. Either directly or through joint ventures, we now own interests in nine
operating pipeline systems, which extend approximately 1,500 miles and have a
design capacity of 6.8 Bcf of natural gas and 400.0 Mbbls of oil per day. We
also own multi-purpose platforms; production handling, dehydration and other
energy-related infrastructure facilities; as well as oil and natural gas
properties.


     Our general partner is a wholly owned indirect subsidiary of El Paso
Energy. El Paso Energy is a diversified energy holding company engaged, through
its subsidiaries, in the interstate and intrastate transportation, gathering and
processing of natural gas; the marketing of natural gas, power and other
energy-related commodities; power generation; and the development and operation
of energy infrastructure facilities worldwide. In 1998, El Paso Energy paid
approximately $422.0 million to acquire an effective 27.3% interest in us,
including all of the general partner interests. In addition, at the closing of
the offering of the Series A notes, El Paso Energy contributed to us a 49.0%
interest in Viosca Knoll in exchange for $19.9 million in cash and $59.8 million
in common units. The Viosca Knoll transaction increased El Paso Energy's
effective ownership interest in us to 34.5% and is consistent with El Paso
Energy's strategy to use us as its primary growth vehicle for future offshore
gathering and transportation activities in the Gulf, when practical.


     We have substantial assets in the Gulf, primarily offshore Louisiana and
Mississippi, which we believe are well-situated to maintain a stable base level
of operations and to provide growth opportunities by successfully competing for
new production in our areas of service, especially those assets in the Deepwater
(water depths greater than 1,500 feet), Flextrend (water depths of 600 to 1,500
feet) and subsalt regions. Either directly or through joint ventures, we own
interests in:


     - eight existing and one planned natural gas pipeline systems;

     - an oil pipeline system;

     - six strategically-located, multi-purpose platforms;

     - production handling and dehydration facilities;

     - four producing oil and natural gas properties; and

     - one non-producing oil and natural gas property.


In addition, with our joint venture partners, we are constructing two natural
gas pipelines through newly created joint ventures, East Breaks Gathering
Company, L.L.C. and Nemo Gathering Company, LLC, and we have recently completed
the construction of a wholly owned oil pipeline which we expect to become
operational in the fourth quarter of 1999, the Allegheny System.


     In the past six years, our operations have grown through the acquisition
and construction of energy-related infrastructure, including:

     - acquiring all of the Manta Ray system and constructing and acquiring a
       50.0% interest in the Viosca Knoll system in 1994;

     - constructing two multi-purpose platforms located at Viosca Knoll Block
       817 and Garden Banks Block 72 in 1995 and early 1996, respectively;

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<PAGE>   49

     - forming Flextrend Development Company, L.L.C. to acquire, develop and
       produce oil and natural gas reserves located in the Gulf in 1995;

     - completing construction of the Poseidon system, a sour crude oil pipeline
       system in which we own a 36.0% working interest, in 1996;

     - acquiring an effective 25.7% interest in each of Nautilus and Manta Ray
       Offshore, to which we contributed substantially all of the Manta Ray
       system (originally acquired and constructed during a period from 1992 to
       1994), in 1997;

     - constructing a multi-purpose platform located in East Cameron Block 373
       and acquiring a 100% working interest in the Ewing Bank 958 Unit in 1998;
       and


     - acquiring in 1999 an additional 49.0% interest in the Viosca Knoll
       system, an additional 33.3% interest in UTOS and an additional indirect
       (through Western Gulf) 20.0% interest in HIOS and East Breaks, in June
       1999.


     In addition to our wholly owned assets and operations, we conduct a large
portion of our business through joint ventures/strategic alliances, which we
believe are ideally suited for Deepwater operations. We use joint ventures to
reduce our capital requirements and risk exposure to individual projects, as
well as to develop strategic relationships, realize synergies resulting from
combining resources, and benefit from the assets, experience and resources of
our partners. Generally, our partners are integrated or very large independent
energy companies with substantial interests, operations and assets in the Gulf,
including Coastal/ANR, KN Energy/NGPL, Marathon, Shell and Texaco.

     Through our strategically-located network of wholly owned and joint venture
pipelines and other facilities and businesses, we believe we provide customers
with an efficient and cost effective midstream alternative. Today, we offer some
customers a unique single point of contact through which they may access a wide
range of integrated or independent midstream services, including gathering,
transportation, production handling, dehydration and other services. We also
provide producers operating in certain Deepwater and Flextrend areas with
relatively low-cost access to numerous onshore long-haul pipelines and,
accordingly, multiple end-use markets. Additionally, our specialized Deepwater
experience and expertise allows us to provide economic operational solutions to
producers' other offshore needs.

INDUSTRY OVERVIEW

     We believe that development and exploration activity in the Gulf will
continue and that the Gulf will continue to be one of the most prolific
producing regions in the U.S. Today, the Gulf accounts for approximately 20.3%
and 25.6% of total U.S. production of oil and natural gas, respectively. Oil
production from the Gulf is expected to increase from 1.3 MMbbls/d in 1998 to
1.8 MMbbls/d in 2003, according to the Potential Gas Committee, which is
comprised of academic institutions, government agencies and industry
participants. That committee also expects production of natural gas to increase
from 14.0 Bcf/d in 1998 to 16.6 Bcf/d in 2003. The principal source of this
production growth is expected to be the Flextrend and Deepwater. Recent
developments in oil and natural gas exploration and production techniques, such
as 3-D seismic analysis, horizontal drilling, remote subsea completions via
satellite templates and sea floor wellheads, and non-stationary surface
production facilities, have substantially reduced finding, development and
production costs allowing operators to move into the Deepwater regions of the
Gulf. For instance, the number of blocks under lease in the Gulf in water depths
greater than 600 feet has increased from approximately 3,100 in February 1998 to
approximately 4,200 in February 1999. By year-end 2003, production from deeper
water fields is projected to account for 54.6% and 24.0% of the Gulf's oil and
natural gas production, respectively, up from 35.6% and 13.4% in 1998,
respectively, according to the Potential Gas Committee.

     We have pipelines, platforms and other infrastructure facilities
strategically positioned throughout a large portion of the Flextrend area of the
Gulf, offshore Louisiana and Mississippi and extending out to and, in some
areas, into the Deepwater. Because of their location in relation to the way in
which oil and

                                       45
<PAGE>   50

natural gas development has occurred in the Gulf, we expect these assets to
contribute significantly to the development of natural gas and oil in
surrounding areas of the Flextrend and Deepwater. Historically, development of
nascent Gulf regions has started with large pipelines positioned in a
north/south direction connecting new, significant discoveries to existing
shoreward infrastructure. Then, additional infrastructure has expanded laterally
in an east/west direction to access reserves between the north/south pipelines.
As this pipeline infrastructure became more accessible to more producing
regions, the incremental cost of placing reserves on production declined, which
facilitated the development of projects that could not support the installation
of pipelines on a stand-alone basis. This process of lateral expansion has been
continually repeated as advances in exploration and development technology have
allowed producers to economically explore for oil and natural gas in
progressively deeper water areas. We believe that the exploration and
development of the deeper water areas will accelerate in the future and, as a
result, will continue to provide attractive opportunities for companies
strategically positioned to access production in those areas.

     In part because of the technological advancements and the expanded pipeline
infrastructure, the Gulf Coast was the only part of the United States to see an
increase in potential natural gas supplies in the last two years, while total
U.S. natural gas supplies have declined over that same period, according to the
Potential Gas Committee. That committee also projects that the Gulf coast
natural gas resource base, including proved reserves, increased from 264.9
trillion cubic feet to 265.5 trillion cubic feet during 1998; thus, the Gulf was
the only major producing region in the U.S. which replaced more reserves than
were produced in 1998. Further, in April 1999, Unocal announced that its Mad Dog
prospect, located offshore Louisiana in 6,700 feet of water, drilled to a depth
of 24,000 feet and estimated to contain 400 MMbbls to 800 MMbbls of oil, could
be the largest oil field ever discovered in the Gulf. The Unocal field is an
example of today's rapidly increasing Deepwater hydrocarbon discoveries and
production. Construction by us and others of the pipeline infrastructure
necessary to deliver this production to onshore markets is expected to remain
critical to the expansion and development efforts in these deeper water regions.

     We believe that we are strategically positioned to take advantage of new
discoveries and increased production in the Deepwater, Flextrend and subsalt
regions of the Gulf. In addition to comprising a significant portion of the
network of pipelines in the shallow waters of the Gulf off of Louisiana, our
pipelines also have substantial east/west facilities on the edge of portions of
the Flextrend and deeper water. We also have several existing and planned
extensions into the deeper water regions. However, we cannot assure you that
additional reserves in those areas will actually be developed or, if developed,
that any of our pipelines will gather, transport or otherwise handle that
production.

BUSINESS STRATEGY

     Our strategically-positioned assets, as well as our knowledge and
expertise, enhance our ability to capitalize on infrastructure and other
energy-related business opportunities in the Gulf, particularly in the deeper
water regions. By implementing the following business strategies, we expect to
maintain our position as a provider of integrated energy services, including
natural gas and oil gathering, transportation, midstream and other related
services in the Gulf.

     - FOCUS ON HIGH POTENTIAL DEEPWATER.

      We believe Deepwater operations will provide us with significantly greater
      profit opportunities for a number of reasons. First, our existing assets
      are well-positioned for expansion into the Deepwater. Because of the
      location of certain of our assets, we believe such expansion projects can
      be implemented at a lower cost relative to our competition, thus enhancing
      our goal of being a low-cost provider of gathering, transportation,
      production handling and other midstream services. Second, Deepwater
      projects require large capital investment by producers and, in return,
      produce substantial reserves and cash flow, when successful. Given the
      significant return potential, such projects are undertaken with a
      longer-term view toward the commodity cycle and are substantially less
      sensitive to near-term oil and natural gas prices. Therefore, by focusing
      on Deepwater projects we expect to increase the stability of our
      operations and financial results.

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<PAGE>   51

     - PROVIDE MULTIPLE MARKET ACCESS FOR DEEPWATER, FLEXTREND AND SUBSALT GULF
       PRODUCTION.

      Our primary customers are Deepwater and Flextrend producers, including
      those focusing on the subsalt area of the Gulf. Unlike some of our
      competitors, we connect to numerous onshore, long-haul pipelines and can
      offer producers access to multiple end-use markets. Our ability to provide
      multiple pipeline connections and broad market access is important,
      because it allows producers to take advantage of pricing differentials,
      mitigate capacity constraints and avoid temporary suspensions of service.

     - OFFER A SINGLE SOURCE ALTERNATIVE FOR A COMPLETE RANGE OF MIDSTREAM
      SERVICES.

      Through our strategically-located network of wholly owned and joint
      venture pipelines, other facilities and businesses, we offer some
      customers a unique single point of contact through which they may access a
      wide range of midstream services and assets, including (1) gathering,
      transportation, production handling, dehydration, compression, pumping and
      other handling services for both natural gas and oil, (2) access to
      platforms, compression and other infrastructure facilities, (3)
      significant Flextrend and Deepwater experience and expertise, and (4)
      other related assets and services. Under the more conventional system used
      by many of our competitors, producers must contact and negotiate with a
      number of unaffiliated parties, including natural gas pipelines, oil
      pipelines, processors and other service providers, with potentially
      competing interests. By providing a complete range of services between the
      wellhead and the shore, we believe we provide producers with a more
      efficient midstream solution, which should result in increased revenue
      opportunities.

     - SHARE CAPITAL COSTS AND RISKS WITH STRATEGIC JOINT VENTURE PARTNERS.

      Given the significant cost to expand energy-related infrastructure in the
      Flextrend and Deepwater areas of the Gulf, we seek opportunities to
      undertake such projects through joint ventures or partnerships,
      principally with partners with substantial financial resources and
      substantial strategic interests, assets and operations, especially in the
      Deepwater, Flextrend and subsalt regions of the Gulf. By forming such
      joint ventures or partnerships, we reduce our capital requirements,
      mitigate our risk exposure to individual projects, develop strategic
      business relationships with other industry participants and benefit from
      the assets, experience and resources of our partners. Generally, our
      partners are integrated or very large independent energy companies with
      substantial interests, operations and assets in the Gulf, including
      Coastal/ANR, KN Energy/NGPL, Marathon, Shell and Texaco.

     - DESIGN NEW INFRASTRUCTURE PROJECTS BASED ON DEDICATED PRODUCTION UNDER
       LONG-TERM COMMITMENTS AND/OR FIXED PAYMENT ARRANGEMENTS WITH THE ABILITY
       TO EXPAND CAPACITY AND SERVICES IN THE FUTURE TO CAPTURE POTENTIAL GROWTH
       OPPORTUNITIES.

      We base decisions to construct new infrastructure on both firm long-term
      dedication agreements (and/or fixed payment arrangements) and our
      assessment of potential production in the vicinity of the dedication. This
      strategy allows us to recover our initial investment and receive a base
      return through a stable, predictable source of cash flow. We also design
      our new pipeline, platform, production handling and other hydrocarbon
      handling facilities with additional capacity and with the flexibility to
      expand capacity or provide additional services, as required. For example,
      we may design a platform to allow it to act as a pipeline landing and
      maintenance hub or to facilitate drilling and development activities.
      Although this approach increases the original cost of the asset, we
      believe that such capacity and flexibility allows us to more effectively
      compete for new production and to lower the overall cost of our services.

     - SELECTIVELY INVEST IN OIL AND NATURAL GAS PROPERTIES ASSOCIATED WITH
       INFRASTRUCTURE OPPORTUNITIES.

      In areas we serve or desire to serve, we pursue opportunistic investments
      in pipelines, platforms, production handling facilities and other
      infrastructure assets, as well as selective investment in oil and natural
      gas properties. By providing infrastructure to previously unserved
      geographic regions, we can accelerate the development of oil and natural
      gas properties in that area. The ability to access

                                       47
<PAGE>   52

      common facilities allows producers to share the high fixed costs
      associated with infrastructure and, in certain circumstances, results in
      the economic development of otherwise marginal reserves and in an increase
      in the total reserves produced from that region. Further, we will invest
      in oil and natural gas properties when such investment will augment the
      utilization of our existing assets or lead to a strategic infrastructure
      opportunity.

RECENT DEVELOPMENTS, ACQUISITIONS AND NEW PROJECTS


     UTOS/HIOS/EAST BREAKS ACQUISITION, JOINT VENTURE RESTRUCTURING AND EAST
BREAKS PIPELINE CONSTRUCTION. In December 1998, the partners of HIOS, a Delaware
partnership then owned 40.0% by us, 40.0% by subsidiaries of ANR and 20.0% by a
subsidiary of NGPL, restructured the joint venture arrangement by (1) creating a
holding company named Western Gulf Holdings, L.L.C., (2) converting HIOS, which
owns a regulated natural gas pipeline located in the Gulf, into a limited
liability company named High Island Offshore System, L.L.C., and (3) forming a
new limited liability company named East Breaks Gathering Company, L.L.C. to
construct and operate an unregulated natural gas pipeline system. Western Gulf
owns 100% of each of HIOS and East Breaks.



     On June 30, 1999, we acquired NGPL's 20.0% membership interest in Western
Gulf together with their 33.3% partnership interest in UTOS and certain other
offshore pipeline laterals for total consideration of approximately $51.0
million. As a result of this transaction, we now own 60.0% of Western Gulf (and,
thus, 60.0% of HIOS and East Breaks) and 66.7% of UTOS. ANR owns the remaining
40.0% of Western Gulf and 33.3% of UTOS.



     The East Breaks system will initially consist of 85 miles of an 18 to
20-inch pipeline and related facilities connecting the Diana and Hoover
prospects, which were developed by Exxon Company USA and BP Amoco Plc in
Alaminos Canyon Block 25 in the Gulf, with the HIOS system. The majority of the
construction of the East Breaks system will occur in 1999 and the system is
anticipated to be in service in late 2000 at an estimated cost of approximately
$90.0 million. East Breaks entered into long-term agreements with Exxon and BP
Amoco involving the commitment and the gathering and handling of production from
the Diana and Hoover prospects. All of the natural gas to be produced from 11
blocks in the East Breaks and Alaminos Canyon areas will be dedicated for
transportation services on the HIOS system.



     In February 1999, Western Gulf entered into a $100.0 million revolving
credit facility with a syndicate of commercial banks to provide funds for
substantially all of the costs of the East Breaks system and for other working
capital needs of Western Gulf, East Breaks and HIOS. Western Gulf's ability to
borrow money under its credit facility is subject to certain customary terms and
conditions, including certain limitations on incurring additional indebtedness
(including borrowings under this credit facility) if certain financial targets
are not achieved and maintained. In addition, Western Gulf would be required to
prepay a portion of the balance outstanding under this credit facility to the
extent such financial targets are not achieved and maintained. The credit
facility has no scheduled amortization prior to maturity. This credit facility
is collateralized by Western Gulf's ownership interest in HIOS and East Breaks
and substantially all of the material contracts and agreements of East Breaks
and Western Gulf, and supported by a guarantee from East Breaks, and matures in
February 2004. As of August 9, 1999, Western Gulf had $50.1 million outstanding
under its credit facility, bearing interest at an average floating rate of 6.5%
per annum, and $49.9 million of additional availability under the facility.


     VIOSCA KNOLL TRANSACTION. Prior to the closing of the offering of the
Series A notes, Viosca Knoll Gathering Company was effectively owned 50.0% by us
and 50.0% by El Paso Energy (through a wholly owned subsidiary). In January
1999, we entered into an agreement to acquire an additional 49.0% interest in
Viosca Knoll from El Paso Energy, which would result in us owning 99.0% of
Viosca Knoll with an option to purchase the remaining 1.0% interest. In exchange
for El Paso Energy's contribution of its Viosca Knoll interest, we paid El Paso
Energy $79.7 million for the 49.0% interest, comprised of $19.9 in cash and
$59.8 million in common units. The acquisition of the Viosca Knoll interest
closed on June 1, 1999.

                                       48
<PAGE>   53


     Following the closing of the Viosca Knoll transaction, El Paso Energy's
effective ownership interest in us is 34.5%. As required by our partnership
agreement, our general partner contributed approximately $0.6 million to us on
the closing date of the Viosca Knoll transaction in order to maintain its 1.0%
capital account. In addition, at the closing of the Viosca Knoll transaction, El
Paso Energy contributed to Viosca Knoll approximately $33.4 million in cash,
which equaled 50.0% of the principal amount outstanding under Viosca Knoll's
credit facility, and we thereafter repaid ($66.7 million) and terminated that
credit facility. For a complete description of the Viosca Knoll Transaction, see
"-- Natural Gas and Oil Pipelines -- Viosca Knoll System" beginning on page 52.



     ALLEGHENY OIL PIPELINE. We recently completed construction of the Allegheny
oil pipeline, a 100% owned crude oil pipeline that is 14 inches in diameter and
40 miles in length connecting the Allegheny Field in the Green Canyon area of
the Gulf with the Poseidon oil pipeline at Ship Shoal Block 332. This new
pipeline, which will have a daily capacity of more than 80.0 Mbbls/d, is
scheduled to begin operating in October 1999. We estimate construction and
tie-in costs for the Allegheny oil pipeline to total approximately $27.0
million, $22.8 million of which has been incurred prior to the offering of the
Series A notes.



     EWING BANK 958 UNIT. We believe our Ewing Bank 958 Unit development
project, formerly known as the Sunday Silence Property, provides us with an
opportunity to apply to the Deepwater area several strategies we have
successfully implemented in the shallow and Flextrend areas. Similar to three
other oil and natural gas properties we have developed, this project is
associated with other independent infrastructure opportunities. Although the
Ewing Bank 958 Unit development is a stand-alone project, we expect it to
position us to play a significant role in the extension of pipeline, platform
and other infrastructure facilities and service opportunities in this potential
emerging Deepwater region. Currently, we anticipate building gathering
extensions off of our Poseidon oil pipeline joint venture and our Manta Ray
Offshore Gathering natural gas pipeline joint venture.



     Pursuant to our current plan of development for the Ewing Bank 958 Unit, we
are constructing a Moses Tension Leg Platform from which we would conduct all
activities related to that development, including additional drilling,
maintenance, and separation and handling operations. This platform is designed
for use in water depths of up to 6,000 feet and will have production handling
facilities with a throughput design capacity of 55.0 MMcf of natural gas per day
and 25,000 barrels of oil per day.



     To date there has been no production from the Ewing Bank 958 Unit. We
currently own a 100% working interest in our Ewing Bank 958 Unit, which we
purchased in October 1998 from a wholly owned, indirect subsidiary of El Paso
Energy for $12.2 million. The Ewing Bank 958 Unit is located in approximately
1,500 feet of water and has received a royalty abatement from the MMS for the
first 52.5 MMbbls of oil equivalent to be produced from the field. In addition
to the initial discovery well drilled in 1994 and the two delineation wells
drilled in 1994 and 1998, the Ewing Bank 958 Unit development program may
require drilling up to five additional wells, depending on the level of actual
production and other factors. As with many of our strategic assets, we
continually evaluate various alternatives for the Ewing Bank 958 Unit and the
related infrastructure, including joint ventures, strategic alliances and other
business arrangements. If we do not consummate such an arrangement, we may need
to raise substantial amounts of additional capital to fund this development
project.



     NEMO PIPELINE. On August 10, 1999, we formed Nemo Gathering Company, LLC, a
joint venture owned 66.1% by Tejas Offshore Pipeline, LLC and 33.9% by us, to
construct, own and operate a natural gas gathering system. The Nemo System will
deliver natural gas production from the Shell-operated Brutus and Glider
Deepwater development properties to another of our joint venture pipelines, the
Manta Ray Offshore Gathering System. We expect the Nemo System to be placed in
service in late 2001 at a total cost of approximately $36.0 million.


NATURAL GAS AND OIL PIPELINES

     GENERAL. We conduct a significant portion of our business activities
through joint ventures, currently organized as general partnerships or limited
liability companies, with subsidiaries of other substantial
                                       49
<PAGE>   54


energy companies, including Marathon, Shell, Texaco, Coastal/ANR, KN Energy/NGPL
and El Paso Energy. These joint ventures include Stingray and UTOS, both of
which are partnerships, and Manta Ray Offshore, HIOS, Poseidon, Nautilus, East
Breaks and West Cameron Dehydration, all of which are limited liability
companies. Management decisions related to the joint ventures are made by
management committees comprised of representatives of each partner or member, as
applicable, with authority appointed in direct relationship to ownership
interests.



     Through our operating subsidiaries and our joint ventures, we own interests
in eight operating natural gas pipeline systems, strategically located offshore
Texas, Louisiana and Mississippi, which handle natural gas for producers,
marketers, pipelines and end-users for a fee. Our natural gas pipelines include
over 1,200 miles of pipeline with a throughput capacity of approximately 6.8 Bcf
of natural gas per day. During the years ended December 31, 1998, 1997 and 1996,
the natural gas pipelines handled an average of approximately 3.2 Bcf, 2.7 Bcf
and 2.7 Bcf, respectively, of natural gas per day. Each of our natural gas
pipelines interconnects with one or more long-line transmission pipelines that
provide access to multiple markets in the eastern half of the United States. In
addition, our East Breaks system, which has a design capacity of approximately
400.0 MMcf of natural gas per day, is being constructed and is expected to be
placed in service in late-2000. Our HIOS system is expected to be the primary
beneficiary of the East Breaks volumes.


     None of our natural gas pipelines functions as a merchant to purchase and
resell natural gas, thus avoiding the commodity risk associated with the
purchase and resale of natural gas. Each of Nautilus, Stingray, HIOS and UTOS is
currently classified as a "natural gas company" under the Natural Gas Act of
1938, as amended (the "NGA"), and is therefore subject to regulation by the
FERC, including regulation of rates. None of Manta Ray Offshore, Viosca Knoll,
Green Canyon Pipe Line Company, L.L.C., Ewing Bank Gathering Company, L.L.C.,
East Breaks, or Tarpon Transmission Company is currently, nor is East Breaks
expected to be, considered a "natural gas company" under the NGA.


     We own a 36.0% interest in the Poseidon oil pipeline, a major sour crude
oil pipeline system that was built in response to an increased demand for
additional sour crude oil pipeline capacity in the central Gulf. Poseidon was
constructed and placed in service in three separate phases. Today, Poseidon has
a maximum design capacity of 400.0 Mbbls of oil per day. During 1998, 1997 and
1996, the Poseidon oil pipeline transported an average of approximately 97.5
Mbbls, 52.0 Mbbls and 30.0 Mbbls, respectively, of oil per day. During April
1999, this system averaged 170.0 Mbbls of oil per day. We expect Poseidon's
throughput to increase substantially in the next several years as development
progresses on the significant proved properties committed to that system.



     The following table sets forth certain information with respect to our
operating pipelines. Currently, we operate all of our 100% owned pipelines and
the Viosca Knoll system, and we are scheduled to become the operator of the
Stingray system on or before October 1, 1999. The remaining joint venture
pipelines are operated by unaffiliated companies. In addition, with our joint
venture partners, we are constructing two natural gas pipelines through newly
created joint ventures, East Breaks Gathering Company, L.L.C.


                                       50
<PAGE>   55


and Nemo Gathering Company, LLC, and we have recently completed the construction
of a wholly owned oil pipeline which we expect to become operational in the
fourth quarter of 1999, the Allegheny System.



<TABLE>
<CAPTION>
                            GREEN              MANTA RAY    VIOSCA
                            CANYON   TARPON   OFFSHORE(1)   KNOLL    STINGRAY   HIOS     UTOS    NAUTILUS   POSEIDON
                            ------   ------   -----------   ------   --------   -----    -----   --------   --------
<S>                         <C>      <C>      <C>           <C>      <C>        <C>      <C>     <C>        <C>
Ownership interest........    100%     100%       25.7%        99%(9)     50%     60%    66.7%     25.7%        36%
Unregulated(U)/
  Regulated(R)(2).........      U        U           U          U         R        R        R         R          U
In-service date...........   1990     1978      1987/88      1994      1975     1977     1978      1997       1996
Approximate capacity (MMcf
  per day)................    220       80         755      1,000(3)  1,120     1,800    1,200      600         --
Approximate capacity
  (Mbbls per day).........     --       --          --         --        --       --       --        --        400
Aggregate miles of
  pipeline................     68       40         225        125       417      204       30       101        314
Average gross throughput
  (MMcf/Mbbls per day) for
  calendar year ended:
  December 31, 1998.......    126       63         281        570       658      842      479       153         97
  December 31, 1997.......    148       50         195(4)     388       706      880      316        --(6)      52(7)
  December 31, 1996.......    142       33         217(5)     288       747      930      309        --(6)      30(7)
Average net throughput
  (MMcf/Mbbls per day) for
  calendar year ended(8):
  December 31, 1998.......    126       63          72        285(10)    329     337(11)  159(12)     39        35
  December 31, 1997.......    148       50         195(4)     194(10)    353     352(11)  105(12)     --(6)     19(7)
  December 31, 1996.......    142       33         217(5)     144(10)    373     372(11)  103(12)     --(6)     11(7)
</TABLE>


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

 (1) In January 1997, we contributed substantially all of the Manta Ray
     Gathering system (approximately 160 miles of pipeline) to Manta Ray
     Offshore, decreasing our ownership in this system from 100% to an effective
     25.7%. We continue to own and develop 19 miles of oil pipeline which were
     formerly a part of the Manta Ray Gathering system.

 (2) Regulated pipelines are subject to extensive rate regulation by the FERC
     under the Natural Gas Act.

 (3) The original maximum design capacity of the Viosca Knoll system was 400
     MMcf of natural gas per day. In 1996, Viosca Knoll installed a 7,000
     horsepower compressor on our Viosca Knoll Block 817 platform to allow the
     Viosca Knoll system to increase its throughput capacity to approximately
     700 MMcf of natural gas per day. In 1997, Viosca Knoll added approximately
     25 miles of parallel 20-inch pipelines, increasing its throughput capacity
     to approximately 1,000 MMcf of natural gas per day.

 (4) Represents throughput specifically allocated to us by Manta Ray Offshore
     during the initial year of operations.

 (5) Represents 100% ownership interest during this period.

 (6) The Nautilus system was placed in service in late December 1997.

 (7) The Poseidon oil pipeline was placed in service in three phases, in April
     1996, December 1996 and December 1997.

 (8) Represents throughput net to our interest.

 (9) We expect to acquire the remaining 1.0% interest in Viosca Knoll from El
     Paso Energy after June 1, 2000.


(10) Represents throughput net to our 50.0% ownership interest during such
     period.



(11) Represents throughput net to our 40.0% ownership interest during such
     period.



(12) Represents throughput net to our 33.3% ownership interest during such
     period.


     GREEN CANYON SYSTEM. The Green Canyon system, 100% owned and operated by
us, is an unregulated natural gas transmission system consisting of
approximately 68 miles of 10- to 20-inch diameter offshore pipeline which
transports natural gas from the South Marsh Island, Eugene Island, Garden Banks
and Green Canyon areas in the Gulf to the west leg of the South Lateral owned by
Transcontinental Gas Pipe Line Corporation ("Transco") for transportation to
shore in eastern Louisiana.

     TARPON SYSTEM. The Tarpon system, 100% owned and operated by us, is an
unregulated natural gas transmission facility consisting of approximately 40
miles of 16-inch diameter offshore pipeline that extends from the Ship Shoal
Block 274, South Addition, to the Eugene Island Area, South Addition, in an area
of the Gulf adjacent to the Green Canyon system.

     MANTA RAY OFFSHORE SYSTEM. The Manta Ray Offshore system, indirectly owned
25.7% by us, 50.0% by Tejas Offshore Pipelines (a subsidiary of Shell) and 24.3%
by Marathon Oil Company, is an unregulated natural gas transmission system
consisting of (1) three separate gathering lines, all located offshore Louisiana
in the Gulf, which consist of a total of 76 miles of 12- to 24-inch diameter
pipeline,

                                       51
<PAGE>   56

each interconnecting offshore with the east leg of the Transco's Southeast
Louisiana Lateral, which provides transportation for natural gas to shore in
eastern Louisiana, (2) approximately 51 miles of dual 14- and 16-inch diameter
pipelines, with the 16-inch pipeline extending from Green Canyon Block 29 and
the 14-inch pipeline extending from South Timbalier Block 301 northwesterly to a
shallow water junction platform with production handling facilities located at
Ship Shoal Block 207 and (3) approximately 47 miles of 24-inch pipeline
extending from Green Canyon Block 65 to Ship Shoal Block 207. Affiliates of
Marathon and Shell have dedicated for gathering on the Manta Ray Offshore system
significant deepwater acreage positions in the area. Marathon operates the Manta
Ray Offshore system. Manta Ray is a subsidiary of Neptune, in which we own a
25.7% interest.

     VIOSCA KNOLL SYSTEM. The Viosca Knoll system is an unregulated gathering
system designed to serve the Main Pass, Mississippi Canyon and Viosca Knoll
areas of the Gulf, southeast of New Orleans, offshore Louisiana. It consists of
125 miles of predominantly 20-inch diameter natural gas pipelines and a 7,000
horsepower compressor. The system provides its customers access to the
facilities of a number of major interstate pipelines, including El Paso Energy,
Columbia Gulf Transmission Company, Sonat, Transco and Destin Pipeline Company.

     The base system was constructed in 1994 and is comprised of (1) an
approximately 94 mile, 20-inch diameter pipeline from a platform in Main Pass
Block 252 owned by Shell to a pipeline owned by a wholly owned El Paso Energy
subsidiary at South Pass Block 55 and (2) a six mile, 16-inch diameter pipeline
from an interconnection with the 20-inch diameter pipeline at our Viosca Knoll
Block 817 platform to a pipeline owned by Southern Natural Gas Company at Main
Pass Block 289. A 7,000 horsepower compressor was installed in 1996 on the
Viosca Knoll Block 817 platform to allow the Viosca Knoll system to effect
deliveries at the operating pressures on downstream interstate pipelines with
which it is interconnected. The additional capacity created by such compression
allowed Viosca Knoll to transport new natural gas volumes during 1997 from the
Shell operated Southeast Tahoe and Ram-Powell fields as well as other new
deepwater projects in the area. Recently, Viosca Knoll added approximately 25
miles of parallel 20-inch pipelines to the system east of the Viosca Knoll Block
817 platform to improve deliverability from certain Main Pass producing areas
and redeliveries into the Transco pipeline at Main Pass Block 261 and the Destin
pipeline at Main Pass Block 260. We operate the Viosca Knoll system.


     Prior to the closing of the offering of the Series A notes, Viosca Knoll
was owned 50.0% by us and 50.0% by El Paso Energy (through a wholly owned
subsidiary). In June 1999, we acquired all of El Paso Energy's interest in
Viosca Knoll, other than a 1.0% interest, for $79.7 million, comprised of 25.0%
in cash ($19.9 million) and 75.0% in common units (2,661,870 common units based
on a price of $22.4625 per unit). At the closing of that transaction, (1) El
Paso Energy contributed its interest in Viosca Knoll to us and approximately
$33.4 million in cash to Viosca Knoll, which equaled 50.0% of the principal
amount then outstanding under Viosca Knoll's credit facility, (2) we delivered
to El Paso Energy the cash and common units discussed above and (3) as required
by our partnership agreement, the general partner contributed approximately
$604,000 to us in order to maintain its 1.0% capital account balance. Upon
consummation of the acquisition, our partnership agreement was amended to ensure
that, even though El Paso Energy beneficially owns an effective interest in us
of 34.5%, the other unitholders will still have the votes necessary to remove
the general partner and to call a meeting for such a purpose.


     As a result of the acquisition, we own 99.0% of Viosca Knoll and have the
option to acquire the remaining 1.0% interest during the six-month period
commencing on the day after the first anniversary of the closing date. The
option exercise price, payable in cash, is equal to the sum of $1.6 million plus
the amount of additional distributions which would have been paid, accrued or
been in arrears had we acquired the remaining 1.0% of Viosca Knoll at the
initial closing by issuing additional common units in lieu of a cash payment of
$1.7 million.

     Although certain federal and state securities laws would otherwise limit El
Paso Energy's ability to dispose of any common units held by it, El Paso Energy
would have the right on three occasions to require us to file a registration
statement covering such common units for a three-year period and to participate
in offerings made pursuant to certain other registration statements filed by us
during a ten-year period. Such

                                       52
<PAGE>   57

registrations would be at our expense and, generally, would allow El Paso Energy
to dispose of all or any of its common units. There can be no assurance (1)
regarding how long El Paso Energy may hold any of its common units or (2) that
El Paso Energy's disposition of a significant number of common units in a short
period of time would not depress the market price of the common units.


     Our unitholders of record as of January 28, 1999 ratified and approved the
transactions in a meeting held March 5, 1999 based upon the ratification,
approval and recommendation of the Board of Directors of the general partner and
a Special Committee of independent directors of the general partner and based a
fairness opinion of an independent financial advisor.


     The acquisition of Viosca Knoll's interest closed on June 1, 1999.


     STINGRAY SYSTEM. The Stingray system, owned 50.0% by us and 50.0% by NGPL,
is a regulated natural gas transmission system consisting of (1) approximately
361 miles of 6- to 36-inch diameter pipeline that transports natural gas from
the HIOS, West Cameron, East Cameron and Vermilion lease areas in the Gulf to
onshore transmission systems at Holly Beach, Cameron Parish, Louisiana, (2)
approximately 12 miles of 16-inch diameter pipeline and approximately 31 miles
of 20-inch diameter pipeline, connecting the Garden Banks Block 191 lease
operated by Chevron U.S.A. Production Company and our 50.0%-owned Garden Banks
Block 72 platform, respectively, to the system, and (3) approximately 13 miles
of 16-inch diameter pipeline connecting our platform at East Cameron Block 373
to the Stingray system at East Cameron Block 338. NGPL will continue to operate
the Stingray system until we take over those operations, probably by October 1,
1999.



     HIOS SYSTEM. The HIOS system, indirectly owned 60.0% by us and 40.0% by
ANR, is a regulated natural gas transmission system consisting of approximately
204 miles of pipeline comprised of three supply laterals, the West, Central and
East Laterals, that connect to a 42-inch diameter mainline. The HIOS system
transports natural gas received from fields located in the Galveston, Garden
Banks, HIOS, West Cameron and East Breaks areas of the Gulf to a junction
platform owned by HIOS located in West Cameron Block 167. There, it
interconnects with the UTOS system and a pipeline owned by ANR for further
transportation to points onshore. ANR operates the HIOS system. HIOS is a
subsidiary of Western Gulf, in which we own a 60.0% interest.



     Prior to June 30, 1999, NGPL owned 20.0% of Western Gulf (and, thus, 20.0%
of HIOS). On June 30, we acquired NGPL's 20.0% interest in Western Gulf,
together with its 33.3% interest in UTOS and certain offshore pipeline laterals,
for total consideration of approximately $51.0 million.



     UTOS SYSTEM. The UTOS system, owned 66.7% by us and 33.3% by ANR, is a
regulated natural gas transmission system consisting of approximately 30 miles
of 42-inch diameter pipeline extending from a point of interconnection with the
HIOS system at West Cameron Block 167 to the Johnson Bayou production handling
facility. The UTOS system transports natural gas from the terminus of the HIOS
system at West Cameron Block 167 to the Johnson Bayou facility, where it
interconnects with several pipelines. The UTOS system is essentially an
extension of the HIOS system, as almost all the natural gas transported through
UTOS comes from the HIOS system. UTOS also owns the Johnson Bayou facility,
which provides primarily natural gas and liquids separation and natural gas
dehydration for natural gas transported on the HIOS and UTOS systems. ANR
operates the UTOS system.



     Prior to June 30, 1999, NGPL owned 33.3% of UTOS. On June 30, we acquired
NGPL's 33.3% interest in UTOS, together with its 20.0% interest in Western Gulf
and certain offshore pipeline laterals, for total consideration of approximately
$51.0 million.


     NAUTILUS SYSTEM. The Nautilus system, indirectly owned 25.7% by us, 50.0%
by Tejas and 24.3% by Marathon, is a regulated natural gas transmission system
consisting of 101 miles of 30-inch pipeline running downstream from Ship Shoal
Block 207 and connecting to a natural gas production handling plant onshore
Louisiana operated by Exxon and some other facilities downstream of that plant
and effects deliveries to multiple interstate pipelines. Affiliates of Marathon
and Tejas have dedicated to the Nautilus system certain deepwater acreage
positions in the area. Marathon operates and maintains the Nautilus

                                       53
<PAGE>   58

system and Tejas performs financial, accounting and administrative services for
Nautilus. Nautilus is a subsidiary of Neptune, in which we own a 25.7% interest.

     POSEIDON SYSTEM. The Poseidon system, owned 36.0% by us, 36.0% by Texaco,
Inc. and 28.0% by a subsidiary of Marathon, is an unregulated major new sour
crude oil pipeline system that was built in response to an increased demand for
additional sour crude oil pipeline capacity in the central Gulf. The Poseidon
system consists of (1) approximately 117 miles of 16- to 20-inch diameter
pipeline extending in an easterly direction from our 50.0%-owned platform
located at Garden Banks Block 72 to our platform located at Ship Shoal Block
332, (2) approximately 122 miles of 24-inch diameter pipeline extending in a
northerly direction from the Ship Shoal Block 332 platform to Houma, Louisiana
and (3) approximately 58 miles of 16-inch diameter pipeline extending
northwesterly from Ewing Bank Block 873 to the Texaco-operated Eugene Island
Pipeline System at Ship Shoal Block 141. In July 1998, Poseidon completed a
17-mile extension of 16-inch pipeline from Garden Banks Block 260 to South Marsh
Island Block 205. Texaco pipelines and related facilities accept oil from
Poseidon at Larose and Houma, Louisiana and redeliver it to St. James,
Louisiana, a significant market hub for batching, handling and transportation of
oil. Currently, Texaco operates the Poseidon system and has contracted with
Equilon Pipeline Company, LLC, a newly-formed joint venture between Texaco and
Shell, to operate and perform the administrative functions related to Poseidon
and the Poseidon system. In April 1999, Texaco assigned its membership interest
in Poseidon to Equilon.

OIL AND NATURAL GAS SUPPLY

     A substantial portion of the reserves handled by our pipelines is committed
pursuant to long-term contracts, for the productive life of the relevant field.
Nonetheless, these reserves and other reserves that may become available to our
pipelines are depleting assets and, as such, will be produced over a finite
period. Each of our pipelines must access additional reserves to offset the
natural decline in production from existing connected wells or the loss of any
other production to a competitor.

     As somewhat reflected by throughput for 1998, Manta Ray Offshore, Viosca
Knoll and Tarpon obtained commitments from new fields and some additional
commitments from existing fields. However, Green Canyon, Stingray, HIOS and UTOS
were not able to offset reductions in throughput associated with normal
production declines for committed reserves with throughput associated with
commitments of additional reserves. Nevertheless, we believe that there will be
sufficient reserves available to the natural gas pipelines for transportation to
maintain throughput at or near current levels for at least several years.

     In addition to the production commitments from Texaco and Marathon,
Poseidon has been successful in obtaining long-term commitments of production
from several properties containing significant reserves. Poseidon has contracted
with affiliates of Exxon, Phillips Petroleum, BP Amoco, Anadarko, Newfield
Exploration, Mobil, Amerada Hess, Oryx, Sun, PennzEnergy, Enterprise Oil,
British Borneo, Occidental and us. We anticipate that Poseidon will add more
commitments as new subsalt and Deepwater fields are developed in the area which
the Poseidon system serves, but we cannot assure you any such commitment would
be made or when the production from such commitment would be initiated. However,
we do believe that there should be significant increases in reserves committed
to the Poseidon system for at least the next several years.

     Tatham Offshore's Ewing Bank Block 914 #2 well was the only production
dedicated to the Ewing Bank system. In May 1997, the well was shut in due to a
mechanical problem. After approximately one year of evaluating certain remedies
to place the well on production, we decided, along with Tatham Offshore, to
abandon the well and the Ewing Bank system in May 1998.

OFFSHORE PLATFORMS AND OTHER FACILITIES

     GENERAL. Offshore platforms play a key role in the development of oil and
natural gas reserves and, thus, in the offshore pipeline network. Platforms are
used to interconnect the offshore pipeline grid and to provide an efficient
means to perform pipeline maintenance and to locate compression, separation,

                                       54
<PAGE>   59

production handling and other facilities. In addition to numerous platforms
owned by our joint ventures, we own six strategically located platforms in the
Gulf.

     The following table sets forth certain information with respect to our
platforms.


<TABLE>
<CAPTION>
                                            VIOSCA   GARDEN    EAST      SHIP      SOUTH     SHIP
                                            KNOLL    BANKS    CAMERON   SHOAL    TIMBALIER   SHOAL
                                             817       72       373      332        292       331
                                            ------   ------   -------   ------   ---------   -----
<S>                                         <C>      <C>      <C>       <C>      <C>         <C>
Ownership interest........................    100%       50%     100%      100%      100%     100%
In-service date...........................   1995      1995     1998      1985      1984     1994
Water depth (in feet).....................    671       518      441       438       283      376
Acquired (A) or constructed (C)...........      C         C        C         A         A        A
Product handling capacity:
  Natural gas (MMcf per day)..............    140        80      110       150(1)     150      --(1)
  Oil and condensate (bbls per day).......  5,000    55,000    5,000    12,000(1)   2,500      --(1)
</TABLE>


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

(1) Our Ship Shoal Block 331 platform is currently used as a satellite landing
    area and all products transported over the platform are processed on our
    Ship Shoal Block 332 platform.


     Further, we recently began construction of a Moses Tension Leg Platform in
connection with the development of our Ewing Bank 958 Unit.


     VIOSCA KNOLL BLOCK 817. We constructed a multi-purpose platform located in
Viosca Knoll Block 817 in 1995. We used this platform as a base for conducting
drilling operations for oil and natural gas reserves located on the Viosca Knoll
Block 817 lease. In addition, the platform serves as a base for landing other
Deepwater production in the area, thereby generating platform access and
production handling fees for us. A 7,000 horsepower compressor was installed in
1996 on the Viosca Knoll Block 817 platform to allow the Viosca Knoll system to
effect deliveries at the operating pressures on downstream interstate pipelines
with which it is interconnected. The additional capacity created by such
compression allowed Viosca Knoll to transport new natural gas volumes during
1997 from the Shell-operated Southeast Tahoe and Ram-Powell fields as well as
other new Deepwater projects in the area. Viosca Knoll leases space on this
platform from us for the location of the new compression equipment for the
Viosca Knoll system. We own 100% of the Viosca Knoll 817 platform.

     GARDEN BANKS BLOCK 72. We own a 50.0% interest in a multi-purpose platform
located in Garden Banks Block 72. This platform is located at the south end of
the Stingray system and serves as the westernmost terminus of the Poseidon
system. We also use this platform in our drilling and production operations. It
now serves as the landing site for production from our Garden Banks Block 117
lease located in an adjacent lease block.

     EAST CAMERON BLOCK 373. In 1998, we placed in service a new multi-purpose
platform located in East Cameron Block 373 at a construction cost of $30.2
million. This four pile production platform with production handling facilities
is strategically located to exploit deeper water reserves in the East Cameron
and Garden Banks areas of the Gulf and is the terminus for an extension of the
Stingray system. Kerr McGee Corporation has rights to utilize a portion of the
platform and has committed its production from multiple blocks in the East
Cameron and Garden Banks areas to be processed on this platform and transported
through the Stingray system. We own 100% of the East Cameron Block 373 platform.

     SHIP SHOAL BLOCK 332. We own a 100% interest in a platform located in Ship
Shoal Block 332 which serves as a junction platform for natural gas pipelines in
the Manta Ray Offshore system as well as an eastern junction for the Poseidon
system.

     SOUTH TIMBALIER BLOCK 292. The South Timbalier Block 292 platform is a
100%-owned facility located at the easternmost terminus of the Manta Ray
Offshore system and serves as a landing site for natural gas production in that
area.

     SHIP SHOAL BLOCK 331. In August 1998, in connection with El Paso Energy's
acquisition of our general partner, we acquired the Ship Shoal Block 331
platform, a production facility located 75 miles off

                                       55
<PAGE>   60

the coast of Louisiana in approximately 370 feet of water. Pogo Producing
Company has certain rights to utilize the platform pursuant to a production
handling and use of space agreement. We own 100% of the Ship Shoal Block 331
platform.

     OTHER FACILITIES. Through our 50.0% ownership interest in West Cameron
Dehy, we own an interest in certain dehydration facilities located at the
northern terminus of the Stingray system, onshore Louisiana.

MAINTENANCE

     Each of our pipelines requires regular and thorough maintenance. The
interior of pipelines is maintained through the regular "pigging" of the lines.
Pigging involves propelling a large spherical object through the line which
collects, or pushes, any condensate and other liquids on the walls or at the
bottom of the pipeline through the line and out the far end. More sophisticated
pigging devices include those with scrapers, brushes and x-ray devices; however,
such pigging devices are usually deployed only on an as needed basis. Corrosion
inhibitors are also injected into all of the systems through the flow stream on
a continuous basis. To prevent external corrosion of the pipe, sacrificial
anodes are fastened to the pipeline at prescribed intervals, providing
protection from sea water. Our platforms are painted to the waterline every
three to five years to prevent atmospheric corrosion. Sacrificial anodes are
also fastened to the platform legs below the waterline to prevent corrosion. A
sacrificial anode is a zinc aluminum alloy fixture that is attached to the
exterior of a steel object to attract the corrosive reaction that occurs between
steel and saltwater to the fixture itself, thus protecting the steel object from
corrosion. Remotely operated vehicles or divers inspect our platforms below the
waterline, usually every five years.

     The Stingray, HIOS, Viosca Knoll, Manta Ray Offshore and Poseidon systems
include platforms that are manned on a continuous basis. The personnel onboard
those platforms are responsible for site maintenance, operations of the
facilities on the platform, measurement of the natural gas stream at the source
of production and corrosion control (pig launching and inhibitor injection).

COMPETITION

     Each of our natural gas pipelines is located in or near natural gas
production areas that are served by other pipelines. As a result, each of our
natural gas pipeline systems faces competition from both regulated and
unregulated systems. Some of these competitors are not subject to the same level
of rate and service regulation as, and may have a lower cost structure than, our
natural gas pipelines. Other competing pipelines, such as long-haul
transporters, have rate design alternatives unavailable to our natural gas
pipelines. Consequently, those competing pipelines may be able to provide
service on more flexible terms and at rates significantly below the rates
offered by our natural gas pipelines. The principal competitors of our regulated
pipeline systems are Shell, Texaco, ANR, Transco, Trunkline Gas Co., Texas
Eastern, Columbia Gas Transmission and their affiliates.


     The Poseidon system was built as a result of our belief that additional
sour crude oil capacity was required to transport new subsalt and Deepwater oil
production to shore. Poseidon's principal competitors for additional crude oil
production are Equilon Pipeline Company, LLC (a 36.0% owner of Poseidon), which
owns the Texaco-operated Eugene Island Pipeline and the Shell-operated Amberjack
systems that compete with Poseidon and oil pipelines built, owned and operated
by producers to handle their own production and, as capacity is available,
production for others. Our pipelines compete for new production with these and
other competitors on the basis of geographic proximity to the production, cost
of connection, available capacity, transportation rates and access to onshore
markets. In addition, the ability of the pipelines to access future reserves
will be subject to the ability of the pipelines or the producers to fund the
anticipated significant capital expenditures required to connect the new
production.


CUSTOMERS AND CONTRACTS


     GENERAL. The rates we charge for our services are dependent on (1) whether
the relevant pipeline, platform, production handling, dehydration or other
facility is regulated or unregulated -- established maximum rate or fully
negotiated rate, (2) the quality of the service required by the customer --

                                       56
<PAGE>   61

interruptible or firm, and (3) the amount and term of the reserve commitment by
the customer. A significant portion of our arrangements involve life-of-reserve
commitments with both firm and interruptible components. Generally, we receive a
price per unit (Mcf of natural gas or barrel of oil or water) handled. And
depending on transaction specific factors, for firm arrangements, we often also
receive a monthly fixed fee which is paid by the customer regardless of the
level of throughput, except under individually specified circumstances.

     The Poseidon system receives crude oil from committed properties under
buy/sell agreements, often surviving for the life of the property. The same
factors described above affect the contract amounts and other terms.

     PRINCIPAL CUSTOMERS. See our consolidated financial statements and notes
thereto located elsewhere in this prospectus for certain information regarding
our principal transportation customers.

OIL AND NATURAL GAS PROPERTIES

     GENERAL. We conduct exploration and production activities through a
subsidiary that is an independent energy company engaged in the development and
production of reserves located offshore the U.S. in the Gulf focusing
principally on the Flextrend and Deepwater areas. As of December 31, 1998, we
owned interests in four producing and one non-producing oil and natural gas
properties, comprised of thirteen lease blocks in the Gulf covering 66,369 gross
(54,278 net) acres. We sell the majority of our oil and natural gas production
to Offshore Gas Marketing, Inc., our affiliate and an indirect wholly owned
subsidiary of El Paso Energy.

     The following is a description of our currently held properties.

     VIOSCA KNOLL BLOCK 817. Viosca Knoll Block 817 is a producing property that
is comprised of 5,760 gross and net acres located 40 miles off the coast of
Louisiana in approximately 670 feet of water. Initially, we acquired a 75.0%
working interest in Viosca Knoll Block 817 from the sea-floor through the
stratigraphic equivalent of the base of the Tex X-6 Sand, subject to certain
reversionary rights. In connection with El Paso Energy's acquisition of our
general partner, those reversionary rights were relinquished and we acquired the
remaining 25.0% working interest in Viosca Knoll Block 817. This working
interest is subject to a production payment that entitles the holders in the
aggregate to 25.0% of the proceeds from the production attributable to this
working interest (after deducting all leasehold operating expenses, including
platform access and production handling fees) until the holders have received
the aggregate sum of $16.0 million. At December 31, 1998, the unpaid portion of
the production payment obligation totaled $11.1 million.


     As operator, we concluded a drilling program and placed eight wells on
production on Viosca Knoll Block 817. We do not anticipate drilling any more
wells or having any other major expenditures with respect to this property
except for the possible recompletion of certain existing wells. From inception
of production in December 1995 through December 31, 1998, the Viosca Knoll
property has produced 42,661 MMcf of natural gas and 67.6 Mbbls of oil, net to
our interest. During June 1999, Viosca Knoll Block 817 produced an aggregate of
approximately 35.0 MMcf of natural gas per day. Natural gas production from
Viosca Knoll Block 817 is dedicated to us for gathering through the Viosca Knoll
system and oil production is transported through a Shell-operated system. Our
recent expansion of the Viosca Knoll system eliminated downstream pipeline
capacity constraints on that system and is expected to allow us to produce
Viosca Knoll Block 817 at optimal rates in the future.


     GARDEN BANKS BLOCK 72. Garden Banks Block 72 covers 5,760 gross (2,880 net)
acres and is located 120 miles off the coast of Louisiana in approximately 550
feet of water. In 1995, we acquired a 50.0% working interest (approximately
40.2% net revenue interest) in Garden Banks Block 72, subject to certain
reversionary interests which were relinquished in connection with El Paso
Energy's acquisition of our general partner. A subsidiary of Occidental
Petroleum Company owns the remaining 50.0% working interest in Garden Banks
Block 72.

                                       57
<PAGE>   62


     Since May 1996, we have placed five wells on production at Garden Banks
Block 72. We do not anticipate drilling any more wells or having any other major
expenditures with respect to this property except for the possible recompletion
of certain existing wells. Production at Garden Banks Block 72 totaled 2,979
MMcf of natural gas and 902.1 Mbbls of oil, net to our interest, from the
inception of production in May 1996 through December 31, 1998. During June 1999,
the five wells produced a total of approximately 1.2 Mbbls of oil and 3.6 MMcf
of natural gas per day. Natural gas production from Garden Banks Block 72 is
being transported through the Stingray system and the oil production is
delivered to the Poseidon oil pipeline.


     GARDEN BANKS BLOCK 117. Garden Banks Block 117 covers 5,760 gross (2,880
net) acres adjacent to Garden Banks Block 72 and is located in approximately
1,000 feet of water. In 1995, we acquired a 50.0% working interest
(approximately 37.5% net revenue interest) in Garden Banks Block 117, subject to
certain reversionary interests which were relinquished in connection with El
Paso Energy's acquisition of our general partner. Midcon Exploration owns the
remaining 50.0% working interest in Garden Banks Block 117.


     In July 1996 and May 1997, we completed and initiated production from the
Garden Banks Block 117 #1 and #2 wells, respectively. During June 1999, these
wells produced a total of approximately 1.2 Mbbls of oil and 2.6 MMcf of natural
gas per day. Since inception of production through December 31, 1998, Garden
Banks Block 117 produced 1,327 MMcf of natural gas and 761.8 Mbbls of oil, net
to our interest. We do not anticipate drilling any more wells on this property
except for a recompletion of the Garden Banks 117 #2 well. Natural gas
production from Garden Banks Block 117 is transported on the Stingray system and
oil production is delivered to the Poseidon oil pipeline.


     WEST DELTA BLOCK 35. In connection with El Paso Energy's acquisition of our
general partner, we acquired a 38.0% non-operating working interest in West
Delta Block 35, a producing field located 10 miles off the coast of Louisiana in
approximately 60 feet of water covering 4,985 gross (1,894 net) acres. The West
Delta Block 35 field commenced production in July 1993. Since August 14, 1998
through December 31, 1998, West Delta Block 35 produced 272 MMcf of natural gas
and 2.2 Mbbls of oil, net to our interest.


     EWING BANK 958 UNIT. We purchased the Ewing Bank 958 Unit in October 1998
from a wholly owned, indirect subsidiary of El Paso Energy. Our current plan of
development contemplates the construction of a gathering system and a Moses
Tension Leg Platform. This platform, which may be used in up to 6,000 feet of
water, will have production handling facilities with a throughput design
capacity of 55.0 MMcf of natural gas per day and 25,000 barrels of oil per day.
Accordingly, we recently began construction of the Moses Tension Leg Platform,
which will be designed to support a deck and topside facilities weighing up to
6,000 short tons and process 25,000 barrels of oil per day and 55.0 MMcf of
natural gas per day. In addition to the initial discovery well drilled in 1994
and the two delineation wells drilled in 1994 and 1998, the Ewing Bank 958 Unit
development program could require drilling up to five additional wells,
depending on the level of actual production and other factors. To date there has
been no production from the Ewing Bank 958 Unit.


COMPETITION

     The oil and natural gas industry is intensely competitive. In all segments
of our business, we compete with a substantial number of other companies,
including some with larger technical staffs and greater financial and
operational resources. Many such competitors are more vertically integrated than
we are -- that is, they not only acquire, explore for, develop, produce, gather
and transport oil and natural gas reserves, but also carry on refining
operations, generate electricity and market refined products. As a result, many
of our competitors may be better positioned to acquire and exploit prospects,
hire personnel, market production and withstand the effects of general and/or
industry-specific economic changes. We also face potential competition from
companies not previously active in oil and natural gas who may choose to acquire
reserves to establish a firm supply or simply as an investment. In addition, the
oil and natural gas

                                       58
<PAGE>   63

industry competes with other industries supplying energy and fuel to industrial,
commercial and individual consumers.

OIL AND NATURAL GAS RESERVES

     The following estimates of our total proved developed and proved
undeveloped reserves of oil and natural gas as of December 31, 1998 have been
made by Netherland, Sewell & Associates, Inc., an independent petroleum
engineering consulting firm.

<TABLE>
<CAPTION>
                                                           OIL (BARRELS)      NATURAL GAS (MCF)
                                                           -------------   ------------------------
                                                              PROVED         PROVED       PROVED
                                                             DEVELOPED     DEVELOPED    UNDEVELOPED
                                                           -------------   ----------   -----------
<S>                                                        <C>             <C>          <C>
Viosca Knoll Block 817...................................       80,592     21,700,344    2,452,000
Garden Banks Block 72....................................      495,437      2,306,934           --
Garden Banks Block 117...................................      991,888      1,645,839           --
West Delta Block 35......................................        9,599        779,179           --
                                                             ---------     ----------    ---------
          Total..........................................    1,577,516     26,432,296    2,452,000
                                                             =========     ==========    =========
</TABLE>

     In general, estimates of economically recoverable oil and natural gas
reserves and of the future net revenue therefrom are based upon a number of
variable factors and assumptions, such as historical production from the subject
properties, the assumed effects of regulation by governmental agencies and
assumptions concerning future oil and natural gas prices, future operating costs
and future plugging and abandonment costs, all of which may vary considerably
from actual results. All such estimates are to some degree speculative, and
classifications of reserves are only attempts to define the degree of
speculation involved. For these reasons, estimates of the economically
recoverable oil and natural gas reserves attributable to any particular group of
properties, classifications of such reserves based on risk of recovery and
estimates of the future net revenue expected therefrom, prepared by different
engineers or by the same engineers at different sites, may vary substantially.
The meaningfulness of such estimates is highly dependent upon the assumptions
upon which they are based.

     Furthermore, production from Garden Banks Block 117, Garden Banks Block 72
and Viosca Knoll Block 817 was initiated in July 1996, May 1996 and December
1995, respectively, and, accordingly, estimates of future production are based
on this limited history. Estimates with respect to proved undeveloped reserves
that may be developed and produced in the future are often based upon volumetric
calculations and upon analogy to similar types of reserves rather than upon
actual production history. Estimates based on these methods are generally less
reliable than those based on actual production history. Subsequent evaluation of
the same reserves based upon production history will result in variations, which
may be substantial, in the estimated reserves. A significant portion of our
reserves is based upon volumetric calculations.

                                       59
<PAGE>   64

     The following table sets forth, as of December 31, 1998, the estimated
future net cash flows and the present value of estimated future net cash flows,
discounted at 10.0% per annum, from the production and sale of the proved
developed and undeveloped reserves attributable to our interest in oil and
natural gas properties as of such date, as determined by Netherland, Sewell in
accordance with the requirements of applicable accounting standards, before
income taxes.

<TABLE>
<CAPTION>
                                                                      DECEMBER 31, 1998
                                                              ---------------------------------
                                                               PROVED       PROVED       TOTAL
                                                              DEVELOPED   UNDEVELOPED   PROVED
                                                              ---------   -----------   -------
                                                                       (IN THOUSANDS)
<S>                                                           <C>         <C>           <C>
Undiscounted estimated future net cash flows from proved
  reserves before income taxes(1)...........................   $28,457       $864       $29,321
Present value of estimated future net cash flows from proved
  reserves before income taxes, discounted at 10.0%(2)......   $26,131       $541       $26,672
</TABLE>

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

(1) The average oil and natural gas prices, as adjusted by lease for gravity and
    Btu content, regional posted price differences and oil and natural gas price
    hedges in place and weighted by production over the life of the proved
    reserves, used in the calculation of estimated future net cash flows at
    December 31, 1998 are $9.80 per barrel of oil and $1.53 per Mcf of natural
    gas.

(2) We estimate that, if all other factors (including the estimated quantities
    of economically recoverable reserves) were held constant, a $1.00 per barrel
    change in oil prices from that used in the Netherland, Sewell reserve report
    would change the December 31, 1998 present value of future net cash flows
    from proved reserves by approximately $1.3 million or a $0.10 per Mcf change
    in gas prices from that used in the Netherland, Sewell reserve report would
    change such present value by approximately $3.1 million.

     In accordance with applicable requirements of the Securities and Exchange
Commission, the estimated discounted future net revenue from estimated proved
reserves are based on prices and costs at fiscal year end unless future prices
or costs are contractually determined at such date. Actual future prices and
costs may be materially higher or lower. Actual future net revenue also will be
affected by factors such as actual production, supply and demand for oil and
natural gas, curtailments or increases in consumption by natural gas purchasers,
changes in governmental regulations or taxation and the impact of inflation on
costs.

     In accordance with the methodology approved by the SEC, specific
assumptions were applied in the computation of the reserve evaluation estimates.
Under this methodology, future net cash flows are determined by reducing
estimated future gross cash flows to us for oil and natural gas sales by the
estimated costs to develop and produce the underlying reserves, including future
capital expenditures, operating costs, transportation costs, royalty and
overriding royalty burdens, production payments and net profits interest expense
on certain of our properties.

     Future net cash flows were discounted at 10.0% per annum to arrive at
discounted future net cash flows. The 10.0% discount factor used to calculate
present value is required by the SEC, but such rate is not necessarily the most
appropriate discount rate. Present value of future net cash flows, irrespective
of the discount rate used, is materially affected by assumptions as to timing of
future oil and natural gas prices and production, which may prove to be
inaccurate. In addition, the calculations of estimated net revenue do not take
into account the effect of certain cash outlays, including, among other things,
general and administrative costs, interest expense and partner distributions.
The present value of future net cash flows shown above should not be construed
as the current market value as of December 31, 1998, or any prior date, of the
estimated oil and natural gas reserves attributable to our properties.

                                       60
<PAGE>   65

PRODUCTION, UNIT PRICES AND COSTS

     The following table sets forth certain information regarding the production
volumes of, average unit prices received for and average production costs for
our sale of oil and natural gas for the periods indicated:

<TABLE>
<CAPTION>
                                           OIL (BARRELS)                NATURAL GAS (MMCF)
                                      YEAR ENDED DECEMBER 31,         YEAR ENDED DECEMBER 31,
                                   ------------------------------   ---------------------------
                                     1998       1997       1996      1998      1997      1996
                                   --------   --------   --------   -------   -------   -------
<S>                                <C>        <C>        <C>        <C>       <C>       <C>
Net production(1)................   540,000    801,000    393,000    11,324    19,792    15,730
Average sales price(1)...........  $  15.69   $  20.61   $  21.76   $  2.01   $  2.08   $  2.37
Average production costs(2)......  $   3.04   $   1.98   $   1.59   $  0.51   $  0.33   $  0.27
</TABLE>

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

(1) The information regarding production and unit prices excludes overriding
    royalty interests.

(2) The components of production costs may vary substantially among wells
    depending on the methods of recovery employed and other factors, but
    generally include third party transportation expenses, maintenance and
    repair, labor and utilities costs.

     The relationship between average sales prices and average production costs
depicted by the table above is not necessarily indicative of future expected
results of our operations.

ACREAGE

     The following table sets forth our developed and undeveloped oil and
natural gas acreage as of December 31, 1998. Undeveloped acreage is considered
to be those lease acres on which wells have not been drilled or completed to a
point that would permit the production of commercial quantities of oil and
natural gas, regardless of whether or not such acreage contains proved reserves.
Gross acres in the following table refer to the number of acres in which we own
directly a working interest. The number of net acres is our fractional ownership
of working interests in the gross acres.

<TABLE>
<CAPTION>
                                                              GROSS     NET
                                                              ------   ------
<S>                                                           <C>      <C>
Developed acreage...........................................   6,792    5,416
Undeveloped acreage.........................................  59,577   48,862
                                                              ------   ------
          Total acreage.....................................  66,369   54,278
                                                              ======   ======
</TABLE>

OIL AND NATURAL GAS DRILLING ACTIVITY

     The following table sets forth the gross and net number of productive, dry
and total exploratory wells and development wells that we have drilled in each
of the respective years:

<TABLE>
<CAPTION>
                                                       YEAR ENDED DECEMBER 31,
                                              ------------------------------------------
                                                  1998           1997           1996
                                              ------------   ------------   ------------
                                              GROSS   NET    GROSS   NET    GROSS   NET
                                              -----   ----   -----   ----   -----   ----
<S>                                           <C>     <C>    <C>     <C>    <C>     <C>
Exploratory
  Natural gas...............................    --      --     --      --      --     --
  Oil.......................................    --      --     --      --    1.00   0.50
  Dry.......................................    --      --     --      --      --     --
          Total.............................    --      --     --      --    1.00   0.50
                                              ====    ====   ====    ====   =====   ====
Development
  Natural gas...............................    --      --     --      --    7.00   5.00
  Oil.......................................  1.00    1.00     --      --    5.00   2.75
  Dry.......................................    --      --     --      --    3.00   1.75
                                              ----    ----   ----    ----   -----   ----
          Total.............................  1.00    1.00     --      --   15.00   9.50
                                              ====    ====   ====    ====   =====   ====
</TABLE>

                                       61
<PAGE>   66

     The following table sets forth our ownership in producing wells at December
31, 1998:

<TABLE>
<CAPTION>
                                                              GROSS    NET
                                                              -----   -----
<S>                                                           <C>     <C>
Natural gas.................................................  10.00    8.26
Oil.........................................................   6.00    3.00
                                                              -----   -----
          Total.............................................  16.00   11.26
                                                              =====   =====
</TABLE>

MAJOR ENCUMBRANCES

     All of the operating assets in which we own an interest are owned by our
subsidiaries or joint ventures. Substantially all of our assets (primarily our
interests in our subsidiaries) and our subsidiaries' assets are pledged as
collateral to secure obligations under our credit facility. In addition, certain
of our joint ventures currently have, and others are expected to have, credit
facilities pursuant to which substantially all of such joint ventures' assets
are or would be pledged.

REGULATION

     The oil and natural gas industry is extensively regulated by federal and
state authorities in the U.S. Numerous departments and agencies, both federal
and state, have issued rules and regulations binding on the oil and natural gas
industry and its individual members, some of which carry substantial penalties
for the failure to comply. Legislation affecting the oil and natural gas
industry is under constant review and statutes are constantly being adopted,
expanded or amended. The regulatory burden on the oil and natural gas industry
increases its cost of doing business.

     GENERAL. The design, construction, operation and maintenance of our natural
gas pipelines and of certain of their natural gas transmission facilities are
subject to regulation by the Department of Transportation under the Natural Gas
Pipeline Safety Act of 1968 as amended (the "NGPSA"). Operations in offshore
federal waters are regulated by the Department of Interior and the FERC. Under
the Outer Continental Shelf Lands Act (the "OCSLA") as implemented by the FERC,
pipelines that transport natural gas across the OCS must offer nondiscriminatory
transportation of natural gas. Substantially all of the pipeline network owned
by our pipelines is located in federal waters in the Gulf, and the related
rights-of-way were granted by the federal government, the agencies of which
oversee such pipeline operations. Federal rights-of-way require compliance with
detailed federal regulations and orders which regulate such operations.

     Poseidon is subject to regulation under the Hazardous Liquid Pipeline
Safety Act ("HLPSA"). In addition, under the OCSLA, as implemented by the FERC,
pipelines that transport crude oil across the OCS must offer "equal access" to
other potential shippers of crude. The Poseidon system is located in federal
waters in the Gulf, and its right-of-way was granted by the federal government.
Therefore, the FERC may assert that it has jurisdiction to compel Poseidon to
grant access under the OCSLA to other shippers of crude oil upon the
satisfaction of certain conditions and to apportion the capacity of the line
among owner and non-owner shippers.

     RATES. Each of our regulated pipelines (the Nautilus, Stingray, HIOS and
UTOS systems) is classified as a "natural gas company" by the NGA. Consequently,
the FERC has jurisdiction over these regulated pipelines with respect to
transportation of natural gas, rates and charges, construction of new
facilities, extension or abandonment of service and facilities, accounts and
records, depreciation and amortization policies and certain other matters. In
addition, these regulated pipelines hold certificates of public convenience and
necessity issued by the FERC authorizing their facilities, activities and
services.

     Under the terms of the regulated pipelines' tariffs on file at the FERC,
the regulated pipelines may not charge or collect more than the maximum rates on
file with the FERC. FERC regulations permit natural gas pipelines to charge
maximum rates that generally allow pipelines the opportunity to (1) recover
operating expenses, (2) recover the pipeline's undepreciated investment in
property, plant and equipment ("rate base") and (3) receive an overall allowed
rate of return on the pipeline's rate base. We

                                       62
<PAGE>   67

believe that even after the rate base of any regulated pipeline is substantially
depleted, the FERC will allow such regulated pipeline to recover a reasonable
return, whether through a management fee or otherwise.

     Each of the Nautilus, Stingray, HIOS and UTOS systems is currently
operating under agreements with their respective customers that provide for
rates that have been approved by the FERC.

     On March 13, 1997, the FERC issued an order declaring Tarpon's facilities
exempt from NGA regulation under the gathering exception, thereby terminating
Tarpon's status as a "natural gas company" under the NGA. Tarpon has agreed,
however, to continue service for shippers that have not executed replacement
contracts on the terms and conditions, and at the rate reflected in, its last
effective regulated tariff for two years from the date of the order. None of the
Green Canyon, Ewing Bank, Manta Ray Offshore or Viosca Knoll systems is
currently, nor do we expect East Breaks to be, considered a "natural gas
company" under the NGA. Consequently, these companies are not subject to
extensive FERC regulation under the NGA or the Natural Gas Policy Act of 1978,
as amended (the "NGPA"), and are thus allowed to negotiate the rates and terms
of service with their respective shippers, subject to the "equal access"
requirements of the OCSLA.

     The FERC has asserted its NGA rate jurisdiction over services performed
through gathering facilities owned by a natural gas company (as defined in the
NGA) when such services were performed "in connection with" transportation
services provided by such natural gas company. Whether, and to what extent, the
FERC should exercise any NGA rate jurisdiction it may be found to have over
gathering facilities owned either by natural gas companies or affiliates thereof
is subject to case-by-case review by the FERC. Based on current FERC policy and
precedent, we do not anticipate that the FERC will assert or exercise any NGA
rate jurisdiction over the Green Canyon, Ewing Bank, Manta Ray Offshore, Viosca
Knoll or East Breaks systems, so long as the services provided through such
lines are not performed "in connection with" transportation services performed
through any of the regulated pipelines.

     The FERC has generally disclaimed jurisdiction to set rates for oil
pipelines in the OCS under the Interstate Commerce Act. As a result, Poseidon,
as operator of the Poseidon system, has not filed tariffs with the FERC for the
Poseidon system.

     PRODUCTION AND DEVELOPMENT. Our production and development operations are
subject to regulation at the federal and state levels. Such regulation includes
requiring permits for the drilling of wells and maintaining bonds and insurance
requirements in order to drill or operate wells, and regulating the location of
wells, the method of drilling and casing wells, the surface use and restoration
of properties upon which wells are drilled and the plugging and abandoning of
wells. Our production and development operations are also subject to various
conservation laws and regulations. These include the regulation of the size of
drilling and spacing units or proration units, the density of wells that may be
drilled, the levels of production, and the unitization or pooling of oil and
natural gas properties.

     We presently have interests in or rights to offshore leases located in
federal waters. Federal leases are administered by the MMS. Individuals and
entities must qualify with the MMS prior to owning and operating any leasehold
or right-of-way interest in federal waters. Such qualification with the MMS
generally involves filing certain documents with the MMS and obtaining an
area-wide performance bond and, in some cases, supplemental bonds representing
security deemed necessary by the MMS in excess of the area-wide bond
requirements for facility abandonment and site clearance costs.

OPERATIONAL HAZARDS AND INSURANCE

     Pipelines, platforms and other offshore assets may experience damage as a
result of an accident or other natural disaster, especially in the deeper water
regions. In addition, our production and development operations are subject to
the usual hazards incident to the drilling and production of natural gas and
crude oil, such as blowouts, cratering, explosions, uncontrollable flows of oil,
natural gas or well fluids, fires, pollution, releases of toxic gas and other
environmental hazards and risks. These hazards can cause personal injury and
loss of life, severe damage to and destruction of property and equipment,
pollution or

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environmental damages and suspension of operations. To mitigate the impact of
repair costs associated with such an accident or disaster, we maintain insurance
of various types that we consider to be adequate to cover our operations. In our
opinion, this insurance provides reasonable coverage for all of our assets
except for our 50.0% interest in the assets of Stingray, for which insurance
providing reasonable coverage is carried at the Stingray partnership level. The
insurance package is subject to deductibles that we consider reasonable and not
excessive. Our insurance does not cover every potential risk associated with
operating pipelines or the drilling and production of oil and natural gas.
Consistent with insurance coverage generally available to the industry, our
insurance policies do not provide coverage for losses or liabilities relating to
pollution, except for sudden and accidental occurrences. We do, however, have
certificates of financial responsibility of not less than $35.0 million per
offshore facility and/or lease.

     The occurrence of a significant event not fully insured or indemnified
against, or the failure of a party to meet its indemnification obligations,
could materially and adversely affect our operations and financial condition. We
believe that we are adequately insured for public liability and property damage
to others with respect to its operations. However, we can give no assurance that
we will be able to maintain adequate insurance in the future at rates we
consider reasonable.

INDUSTRY CONDITIONS

     Profitability and cash flow in the oil and natural gas industry largely
depend on the market prices of oil and natural gas, which historically have been
seasonal, cyclical, volatile and driven by general economic developments,
governmental regulations and many other factors, including weather and political
conditions. Commodity prices for hydrocarbons were very volatile in 1998 and
continue to be in 1999, including some significant declines. These commodity
prices also declined dramatically from 1981 until the mid-1980's and increased
noticeably from the mid-1980's through the early 1990's.

     Supply and demand conditions and regulatory factors have been the primary
contributors to this oil and natural gas price volatility as well as a related
restructuring of certain segments of the energy industry. Increases in worldwide
oil production capability and decreases in energy consumption have brought about
substantial surpluses in oil supplies in recent years. This, in turn, has
resulted in substantial domestic competition between oil and natural gas for
end-use markets. Changes in government regulations relating to the production,
transportation and marketing of natural gas have also resulted in significant
changes in the historical marketing patterns of the natural gas industry.
Generally, these changes have resulted in the abandonment by many pipelines of
long-term contracts for the purchase of natural gas, the development by natural
gas producers of their own marketing programs to take advantage of new
regulations requiring pipelines to transport natural gas for regulated fees, and
the emergence of various types of marketing companies and other aggregators of
natural gas supplies.

     As a result of the recent steep decline in energy commodity prices,
internal and external sources of cash have become constrained, and accordingly,
some industry participants have reduced offshore exploration and development
budgets. The future direction of these commodity prices is uncertain, as are the
long-term effects on the industry.

ENVIRONMENTAL

     GENERAL. Our operations are subject to extensive federal, state and local
statutory and regulatory requirements relating to environmental affairs, health
and safety, waste management and chemical products. In recent years, these
requirements have become increasingly stringent and in certain circumstances,
they impose "strict liability" on a company, rendering it liable for
environmental damage without regard to negligence or fault on the part of such
company. To our knowledge, our operations are in substantial compliance, and are
expected to continue to comply in all material respects, with applicable
environmental laws, regulations and ordinances.

     It is possible, however, that future developments, such as stricter
environmental laws, regulations or enforcement policies could affect the
handling, manufacture, use, emission or disposal of substances or wastes by us
or our pipelines. In addition, some risk of environmental costs and liabilities
is inherent in our
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<PAGE>   69

operations and products as it is with other companies engaged in similar or
related businesses, and there can be no assurance that we will not incur
material costs and liabilities, including substantial fines and criminal
sanctions for violation of environmental laws and regulations. Furthermore, we
will likely be required to increase our expenditures during the next several
years to comply with higher industry and regulatory safety standards. However,
such expenditures cannot be accurately estimated at this time.

     PIPELINES. In addition to the NGA, the NGPA and the OCSLA, several federal
and state statutes and regulations may pertain specifically to the operations of
our pipelines. The Hazardous Materials Transportation Act, 49 U.S.C. sec. 5101
et seq., as amended, regulates materials capable of posing an unreasonable risk
to health, safety and property when transported in commerce. The NGPSA and the
HLPSA authorize the development and enforcement of regulations governing
pipeline transportation of natural gas and hazardous liquids. Although federal
jurisdiction is exclusive over regulated pipelines, the statutes allow states to
impose additional requirements for intrastate lines if compatible with federal
programs. Both Texas and Louisiana have developed regulatory programs that
parallel the federal program for the transportation of natural gas by pipelines.

     SOLID WASTE. The operations of our pipelines may generate or transport both
hazardous and nonhazardous solid wastes that are subject to the requirements of
the federal Resource Conservation and Recovery Act ("RCRA"), as amended, 42
U.S.C. sec. 6901 et. seq., and its regulations, and comparable state statutes
and regulations. Further, it is possible that some wastes that are currently
classified as nonhazardous, via exemption or otherwise, perhaps including wastes
currently generated during pipeline operations, may, in the future, be
designated as "hazardous wastes," which would then be subject to more rigorous
and costly treatment, storage, transportation and disposal requirements. Such
changes in the regulations may result in additional expenditures or operating
expenses by Leviathan. On August 8, 1998, the Environmental Protection Agency
("EPA") added four petroleum refining wastes to the list of RCRA hazardous
wastes. While the full impact of the rule has yet to be determined, the rule
may, as of February 1999, impose increased expenditures and operating expenses
on us or our pipelines, which may take on increased obligations relating to the
treatment, storage, transportation and disposal of certain petroleum refining
wastes that previously were not regulated as hazardous waste.

     HAZARDOUS SUBSTANCES. The Comprehensive Environmental Response,
Compensation and Liability Act ("CERCLA"), 42 U.S.C. sec. 9601 et. seq., and
comparable state statutes, also known as "Superfund" laws, impose liability,
without regard to fault or the legality of the original conduct, on certain
classes of persons that cause or contribute to the release of a "hazardous
substance" into the environment. These persons include the current owner or
operator of a site, the past owner or operator of a site, and companies that
transport, dispose of, or arrange for the disposal of the hazardous substances
found at the site. CERCLA also authorizes the EPA or state agency, and in some
cases, third parties, to take actions in response to threats to the public
health or the environment and to seek to recover from the responsible classes of
persons the costs they incur. Despite the "petroleum exclusion" of Section
101(14) that currently encompasses natural gas, we may nonetheless generate or
transport "hazardous substances" within the meaning of CERCLA, or comparable
state statutes, in the course of our ordinary operations. And, certain petroleum
refining wastes that previously were not regulated as hazardous waste may now
fall within the definition of CERCLA hazardous substances. Thus, we may be
responsible under CERCLA or the state equivalents for all or part of the costs
required to cleanup sites where a release of a hazardous substance has occurred.

     AIR. Our operations may be subject to the Clean Air Act ("CAA"), 42 U.S.C.
sec. 7401-7642, and comparable state statutes. The 1990 CAA amendments and
accompanying regulations, state or federal, may impose certain pollution control
requirements with respect to air emissions from operations, particularly in
instances where a company constructs a new facility or modifies an existing
facility. We may also be required to incur certain capital expenditures in the
next several years for air pollution control equipment in connection with
maintaining or obtaining operating permits and approvals addressing other air
emission-related issues. However, we do not believe our operations will be
materially adversely affected by any such requirements.

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<PAGE>   70

     WATER. The Federal Water Pollution Control Act ("FWPCA") or Clean Water
Act, 33 U.S.C. sec. 1311 et. seq., imposes strict controls against the
unauthorized discharge of produced waters and other oil and natural gas wastes
into navigable waters. The FWPCA provides for civil and criminal penalties for
any unauthorized discharges of oil and other hazardous substances in reportable
quantities, and, along with the Oil Pollution Act of 1990 ("OPA"), 33 U.S.C.
sec.sec. 2701-2761, imposes substantial potential liability for the costs of
removal, remediation and damages. Similarly, the OPA imposes liability for the
discharge of oil into or upon navigable waters or adjoining shorelines. Among
other things, the OPA raises liability limits, narrows defenses to liability and
provides more instances in which a responsible party is subject to unlimited
liability. One provision of the OPA requires that offshore facilities establish
and maintain evidence of financial responsibility of up to $35.0 million or any
amount up to $150.0 million if the EPA determines that a greater amount is
justified based on the relative operational, environmental, human health and
other risks posed by the quantity or quality of the oil involved. State laws for
the control of water pollution also provide varying civil and criminal penalties
and liabilities in the case of an unauthorized discharge of petroleum, its
derivatives or other hazardous substances into state waters. Further, the
Coastal Zone Management Act ("CZMA"), 16 U.S.C. sec.sec. 1451-1464, authorizes
state implementation and development of programs containing management measures
for the control of nonpoint source pollution to restore and protect coastal
waters.

     ENDANGERED SPECIES. The Endangered Species Act ("ESA"), 7 U.S.C. sec. 136,
seeks to ensure that activities do not jeopardize endangered or threatened plant
and animal species, nor destroy or modify the critical habitat of such species.
Under the ESA, certain exploration and production operations, as well as actions
by federal agencies or funded by federal agencies, must not significantly impair
or jeopardize the species or its habitat. The ESA provides for criminal
penalties for willful violations of this act. Other statutes which provide
protection to animal and plant species and thus may apply to our operations are
the Marine Mammal Protection Act, the Marine Protection and Sanctuaries Act, the
Fish and Wildlife Coordination Act, the Fishery Conservation and Management Act,
and the Migratory Bird Treaty Act. The National Historic Preservation Act, 16
U.S.C. sec. 3470, may impose similar requirements.

     COMMUNICATION OF HAZARDS. The Occupational Safety and Health Act, as
amended ("OSHA"), 29 U.S.C. sec.sec. 651 et. seq., the Emergency Planning and
Community Right-to-Know Act, as amended ("EPCRA"), 42 U.S.C. sec.sec. 11001 et.
seq., and comparable state statutes require us to organize and disseminate
information to employees, state and local organizations, and the public about
the hazardous materials used in its operations and its emergency planning.

EMPLOYEES


     Prior to August 1998, we and the general partner depended primarily upon
the employees and management services provided by DeepTech International Inc.
pursuant to a management agreement, although one of our subsidiaries had 10
full-time employees based in Houma, Louisiana to perform operational functions
for its natural gas pipeline and platform operations. Since El Paso Energy's
acquisition of our general partner, El Paso Energy through its subsidiaries has
provided such services under the management agreement. Accordingly, El Paso
Energy hired substantially all of the employees comprising our management team
and those employees performing the operational functions. We reimburse the
general partner for all reasonable general and administrative expenses and other
reasonable expenses incurred by the general partner and its affiliates for or on
behalf of us, including, but not limited to, amounts paid by the general partner
to El Paso Energy and its affiliates under the management agreement. In addition
to the employees provided by affiliates of El Paso Energy under the management
agreement, affiliates of El Paso Energy currently have 15 full-time employees
based in Houma, Louisiana that spend all their time performing operational
functions related to our natural gas pipeline and platform operations. As we
continue to operate more facilities, such as Stingray and the facilities under
construction, we will require more personnel.


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<PAGE>   71

LEGAL PROCEEDINGS

     We are involved from time to time in various claims, actions, lawsuits and
regulatory matters that have arisen in the ordinary course of business,
including various rate cases and other proceedings before the FERC.


     In particular, we are a defendant in a lawsuit filed by Transcontinental
Gas Pipe Line Corporation ("Transco") in the 157th Judicial District Court,
Harris County, Texas on August 30, 1996. Transco alleges that, pursuant to a
platform lease agreement entered into on June 28, 1994, Transco has the right to
expand its facilities and operations on the offshore platform by connecting
additional pipeline receiving and appurtenant facilities. We have denied
Transco's request to expand its facilities and operations because the lease
agreement does not provide for such expansion and because Transco's activities
will interfere with the Manta Ray Offshore system and our existing and planned
activities on the platform. Transco has requested a declaratory judgment and is
seeking damages. The case is set to be tried in November 1999. It is the opinion
of management that adequate defenses exist and that the final disposition of
this suit individually, and all of our other pending legal proceedings in the
aggregate, will not have a material adverse effect on our consolidated financial
position, results of operations or cash flows.


     Leviathan and several subsidiaries of El Paso Energy have been made
defendants in United States ex rel Grynberg v. El Paso Natural Gas Company, et
al. litigation. Generally, the complaint in this motion alleges an industry-wide
conspiracy to underreport the heating value as well as the volumes of the
natural gas produced from federal and Indian lands, thereby depriving the United
States government of royalties. The complaint remains sealed. We believe the
complaint is without merit and therefore will not have a material adverse effect
on our consolidated financial position, results of operations or cash flows.

EL PASO ENERGY'S ACQUISITION OF OUR GENERAL PARTNER


     Effective August 14, 1998, El Paso Energy completed the $422.0 million
acquisition of our general partner, which became a wholly owned indirect
subsidiary of El Paso Energy. The material terms of the acquisition and the
related transactions, as they relate to us, are as follows:



          (1) El Paso Energy acquired the majority interest of Leviathan
     Holdings Company, which owns 100% of our general partner, by acquiring
     DeepTech International Inc. for an aggregate of $365.0 million, and
     acquired the minority interests of Leviathan Holdings and two other
     affiliates of Leviathan Holdings for an aggregate of $55.0 million.
     Therefore, following those acquisitions by El Paso Energy, El Paso Energy
     owned an overall 27.3% effective interest in us, comprised of a 1.0%
     general partner interest, a 25.3% limited partner interest comprised of
     6,291,894 common units and a 1.0% nonmanaging membership interest in most
     of our subsidiaries. Following the closing of the acquisition of the Viosca
     Knoll interest discussed in "-- Natural Gas and Oil Pipelines -- Viosca
     Knoll System," El Paso Energy (through a subsidiary) acquired an additional
     7.2% effective interest in us represented by 2,661,870 common units.


          (2) On August 14, 1998, Tatham Offshore, Inc. (an affiliate of ours
     through August 1998) transferred its remaining assets located in the Gulf
     to us in exchange for the 7,500 shares of Tatham Offshore Series B 9%
     Senior Convertible Preferred Stock owned by us. We acquired Tatham
     Offshore's right, title and interest in and to Viosca Knoll Block 817
     (subject to an existing production payment obligation), West Delta Block
     35, the platform located at Ship Shoal Block 331 and other lease blocks not
     material to our current operations. Our net cash expenditure for these
     transactions totaled $0.8 million representing (a) $2.8 million of
     abandonment costs relating to wells located at Ewing Bank Blocks 914 and
     915 offset by (b) $2.0 million of net cash generated from producing
     properties from January 1, 1998 through August 14, 1998. In addition, we
     assumed all remaining abandonment and restoration obligations associated
     with the platform and leases.

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AVAILABLE INFORMATION

     We are subject to the reporting requirements of the Exchange Act. This
means that we file reports and other information with the Securities and
Exchange Commission. You can inspect and/or copy these reports and other
information at offices maintained by the SEC, including:

     - The principal offices of the SEC located at Judiciary Plaza, 450 Fifth
       Street, N.W., Room 1024, Washington, D.C. 20549;

     - The Regional Offices of the SEC located at Northwestern Atrium Center,
       500 West Madison Street, Suite 1400, Chicago, Illinois 60661-2511;

     - The Regional Offices of the SEC located at 7 World Trade Center, New
       York, New York 10048; and

     - The SEC's website at http://www.sec.gov.

Further, our common units are listed on the New York Stock Exchange, and you can
inspect similar information at the offices of the New York Stock Exchange,
located at 20 Broad Street, New York, New York 10005.

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<PAGE>   73

                                   MANAGEMENT

OUR DIRECTORS AND EXECUTIVE OFFICERS


     We and the general partner utilize the employees of and management services
provided by El Paso Energy and its affiliates under our management agreement. We
reimburse the general partner for reasonable general and administrative
expenses, and other reasonable expenses, incurred by the general partner and its
affiliates, for or on our behalf, including, without limitation, fees paid by
the general partner to El Paso Energy and its affiliates pursuant to our
management agreement. We also reimburse affiliates of our general partner for
costs related to insurance and operational personnel that spend all of their
time in connection with our operations.


     Some of our officers and the general partner's officers and directors are
also officers and directors of El Paso Energy and its affiliates. Such officers
and directors may spend a substantial amount of time managing the business and
affairs of the general partner and El Paso Energy and its affiliates and may
face a conflict regarding the allocation of their time between our interests and
the other business interests of the general partner and El Paso Energy and its
affiliates. Mr. Sims and Mr. Lytal entered into employment agreements with
five-year terms with El Paso Energy pursuant to which they would continue to
serve as Chief Executive Officer and President, respectively, of the general
partner and us. However, pursuant to the terms of their respective employment
agreements, Messrs. Sims and Lytal have the right to terminate such agreements
upon 30 days notice and El Paso Energy has the right to terminate such
agreements under certain circumstances. The general partner may retain, acquire
and invest in businesses that compete with us, subject to certain limitations.
However, the ability of El Paso Energy and its other affiliates to retain,
acquire and invest in businesses that compete with us is not subject to any
limitations.

     Certain provisions of our partnership agreement contain exculpatory
language purporting to (1) limit the liability of the general partner to us and
our unitholders and (2) modify the fiduciary duty standards to which the general
partner would otherwise be subject under Delaware law. Our partnership agreement
provides that (1) any action taken by the general partner consistent with the
standards of reasonable discretion set forth in certain definitions in our
partnership agreement will not breach any duty of the general partner to us or
to our unitholders, (2) in the absence of bad faith by the general partner, the
resolution of conflicts of interest by the general partner will not breach our
partnership agreement or any standard of care or duty and (3) the general
partner and its officers and directors may not be liable to us or to our
unitholders for certain actions or omissions which might otherwise be deemed to
be a breach of fiduciary duty under Delaware or other applicable state law.
Further, the partnership agreement requires us to indemnify the general partner
to the fullest extent permitted by law, which indemnification, in light of the
exculpatory provisions in the partnership agreement, could result in us
indemnifying the general partner for negligent acts.

DIRECTORS AND EXECUTIVE OFFICERS OF THE GENERAL PARTNER


     The following table sets forth certain information as of June 30, 1999,
regarding our executive officers and the executive officers and directors of the
general partner who provide services to us. Each executive officer of the
general partner holds the same executive position for us. Directors are elected
annually by the general partner's sole stockholder, Leviathan Holdings Company,
and hold office until their successors are elected and qualified. Each executive
officer named in the following table has been elected to serve until his
successor is duly appointed or elected or until his earlier removal or
resignation from office.


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<PAGE>   74

     There is no family relationship among any of the executive officers or
directors, and other than described in this prospectus, no arrangement or
understanding exists between any executive officer and any other person pursuant
to which he was or is to be selected as an officer.

<TABLE>
<CAPTION>
NAME                                        AGE                  POSITION(S)
- ----                                        ---                  -----------
<S>                                         <C>   <C>
William A. Wise...........................  53    Director and Chairman of the Board
Grant E. Sims.............................  43    Director and Chief Executive Officer
James H. Lytal............................  41    Director and President
H. Brent Austin...........................  44    Director and Executive Vice President
Robert G. Phillips........................  44    Director and Executive Vice President
Keith B. Forman...........................  41    Vice President and Chief Financial Officer
D. Mark Leland............................  37    Vice President and Controller
Michael B. Bracy..........................  57    Director
H. Douglas Church.........................  61    Director
Malcolm Wallop............................  66    Director
</TABLE>

     WILLIAM A. WISE has served as a director and Chairman of the Board of the
general partner since August 1998, Chairman of the Board of El Paso Energy since
January 1994 and Chief Executive Officer of El Paso Energy since June 1990. Mr.
Wise served as President of El Paso Energy from January 1990 until April 1996
and from July 1998 to the present. Mr. Wise served as President and Chief
Operating Officer of El Paso Energy from April 1989 to December 1989. From March
1987 until April 1989, Mr. Wise was an Executive Vice President of El Paso
Energy and a Senior Vice President of El Paso Energy from January 1984 to
February 1987. Mr. Wise is a member of the Boards of Directors of Battle
Mountain Gold Company and Chase Bank of Texas and is Chairman of the Board of El
Paso Tennessee Pipeline Co.

     GRANT E. SIMS has served as a director of the general partner since July
1995 and as our Chief Executive Officer and the Chief Executive Officer of
general partner since August 1994. Mr. Sims served as our President and
President of the general partner from March 1994 through June 1995. In addition,
Mr. Sims has served as a director and Senior Vice President of DeepTech
International Inc. since July 1993 and served as a director of Offshore Gas
Marketing, Inc., a subsidiary of DeepTech, from December 1992 to March 1994.
Prior to his employment with DeepTech, Mr. Sims spent ten years with Transco in
various capacities, most recently directing Transco's non-jurisdictional natural
gas activities.

     JAMES H. LYTAL has served as a director of the general partner since July
1995 and as our President and President of the general partner since August
1994. He served as our Senior Vice President and Senior Vice President of the
general partner from August 1994 to June 1995. Prior to joining us, Mr. Lytal
was Vice President -- Business Development for American Pipeline Company from
December 1992 to August 1994. Prior thereto, Mr. Lytal served as Vice
President -- Business Development for United Gas Pipe Line Company from March
1991 to December 1992. Prior thereto, Mr. Lytal has served in various capacities
in the oil and natural gas exploration and production and natural gas pipeline
industries with Texas Oil and Gas, Inc. and American Pipeline Company from
September 1980 to March 1991.

     H. BRENT AUSTIN has served as a director and an Executive Vice President of
the general partner and as our Executive Vice President since August 1998. Mr.
Austin has served as an Executive Vice President of El Paso Energy since May
1995 and as the Chief Financial Officer of El Paso Energy since April 1992. He
served as the Senior Vice President of El Paso Energy from April 1992 to May
1995. He served as the Vice President, Planning and Treasurer of Burlington
Resources Inc. from November 1990 to March 1992 and Assistant Vice President,
Planning of Burlington Resources from January 1989 to October 1990. Mr. Austin
is a member of the Board of Directors of El Paso Tennessee Pipeline Co.

     ROBERT G. PHILLIPS has served as a director and an Executive Vice President
of the general partner and as our Executive Vice President since August 1998.
Mr. Phillips has served as President of El Paso Field

                                       70
<PAGE>   75

Services Company since June 1997. He served as President of El Paso Energy
Resources Company from December 1996 to June 1997, President of El Paso Field
Services Company from April 1996 to December 1996 and Senior Vice President of
El Paso Energy from September 1995 to April 1996. For more than five years prior
thereto, Mr. Phillips was Chief Executive Officer of Eastex Energy, Inc.

     KEITH B. FORMAN has served as our Chief Financial Officer and Chief
Financial Officer of the general partner since January 1992 and served as a
director of the general partner from July 1992 to August 1998. Prior to joining
us, Mr. Forman served as Vice President of the Natural Gas Pipeline Group of
Manufacturers Hanover Trust Company which he joined in 1982. His account
responsibility included interstate natural gas transmission companies and
natural gas gathering companies.

     D. MARK LELAND has served as our Vice President and Controller and Vice
President and Controller of the general partner since August 1998 and as Vice
President of El Paso Field Services Company since September 1997. He served as
Director of Business Development for El Paso Field Services Company from
September 1994 to September 1997. For more than five years prior thereto, Mr.
Leland served in various capacities in the finance and accounting functions of
El Paso Energy.

     MICHAEL B. BRACY has served as a director of the general partner since
October 1998. From January 1993 to August 1997, Mr. Bracy served as a director,
Executive Vice President and Chief Financial Officer of NorAm Energy Corp.
(formerly Arkla, Inc.) and as Executive Vice President and Chief Financial
Officer of NorAm from December 1991 to January 1993. For seven years prior
thereto, Mr. Bracy served in various executive capacities with NorAm. From
December 1977 to October 1984, Mr. Bracy held various executive financial
positions with El Paso Energy and prior thereto, Mr. Bracy served in various
capacities with The Chase Manhattan Bank. Mr. Bracy is a member of the Board of
Directors of Itron, Inc.

     H. DOUGLAS CHURCH has served as a director of the general partner since
January 1999. From January 1994 to December 1998, Mr. Church served as the
Senior Vice President, Transmission, Engineering and Environmental for a
subsidiary of, Duke Energy Corporation, Texas Eastern Transmission Company. For
thirty-two years prior thereto, Mr. Church served in various engineering and
operating capacities with Texas Eastern, Panhandle Eastern Corporation and
Transwestern Pipeline Company. Mr. Church is a past member and Chairman of the
Board of Directors of Southern Gas Association and Boys and Girls Country of
Houston, Inc.

     MALCOLM WALLOP has served as a director of the general partner since August
1998 and as a director of El Paso Energy since February 1995. Mr. Wallop became
Chairman of Western Gulf Strategy Group on January 1, 1999. Since January 1996,
Mr. Wallop has served as President for Frontiers of Freedom Foundation, a
political foundation. For eighteen years prior thereto, Mr. Wallop was a member
of the United States Senate. He is a member of the Board of Directors of Hubbell
Inc. and Sheridan State Bank.

COMPENSATION OF DIRECTORS

     Directors of the general partner are entitled to reimbursement for their
reasonable out-of-pocket expenses in connection with their travel to and from,
and attendance at, meetings of the Board or committees thereof. Mr. Paul
Thompson III, Mr. George L. Ball and Mr. William A. Bruckmann, III, directors of
the general partner until their resignation on August 14, 1998, were paid an
annual fee of $36,000 plus $1,000 per meeting attended. Current non-employee
directors are paid an annual fee of $30,000. Officers of the general partner and
our officers are elected by, and serve at the discretion of, the Board.

     Pursuant to our former non-employee director compensation arrangements, we
were obligated to pay each non-employee director 2.5% of the general partner's
Incentive Distribution as a profit participation fee. During the year ended
December 31, 1998, we paid the Messrs. Thompson, Ball and Bruckmann a total of
$600,000 as a profit participation fee. In connection with El Paso Energy's
acquisition of Leviathan, Messrs. Thompson, Ball and Bruckmann resigned and the
compensation arrangements were terminated.
                                       71
<PAGE>   76

     In August 1998, we adopted the 1998 Unit Option Plan for Non-Employee
Directors to provide us with the ability to issue unit options to attract and
retain the services of knowledgeable directors. Unit options to purchase a
maximum of 100,000 common units may be issued pursuant to this plan. Under this
plan, we granted (1) 1,500 unit options to Mr. Wallop in August 1998 to acquire
an equal number of common units at $27.34375 per unit, (2) 1,500 unit options to
Mr. Bracy in October 1998 to acquire an equal number of common units at $25.00
per unit and (3) 1,500 unit options to Mr. Church in January 1999 to acquire an
equal number of common units at $20.625 per unit. Each unit option vests
immediately at the date of grant and shall expire ten years from such date, but
shall be subject to earlier termination in the event that Messrs. Wallop, Bracy
and Church cease to be a director of the general partner for any reason, in
which case the unit options expire 36 months after such date except in the case
of death, in which case the unit options expire 12 months after such date. This
plan is administered by a management committee consisting of the Chairman of the
Board and such other senior officers of the general partner or its affiliates as
the Chairman of the Board shall designate.

COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION


     We do not currently have a compensation committee or another committee
performing similar functions, and all such matters which would be considered by
such committee are acted upon by the full Board of Directors. The Board of
Directors, administers and interprets the Omnibus Plan. See
"Management -- Executive Compensation -- Omnibus Plan" beginning on page 73.


AUDIT AND CONFLICTS COMMITTEE

     Currently, Messrs. Bracy, Church and Wallop, who are neither officers nor
employees of the general partner nor any of its affiliates, serve as the Audit
and Conflicts Committee of the Board of Directors of the general partner and of
us. Mr. Wallop is a director of El Paso Energy. Through August 14, 1998, Messrs.
Thompson, Ball and Bruckmann, who were neither officers nor employees of the
general partner nor any of its affiliates, served as the Audit and Conflicts
Committee.

     The Audit and Conflicts Committee provides two primary services. First, it
advises the Board of Directors in matters regarding the system of internal
controls and the annual independent audit, and reviews our policies and
practices, as well as those of the general partner. Second, the Audit and
Conflicts Committee, at the request of the general partner, reviews specific
matters as to which the general partner believes there may be a conflict of
interest in order to determine if the resolution of such conflict proposed by
the general partner is fair and reasonable to us. Except as otherwise required
by the rules of the NYSE, the Audit and Conflicts Committee only reviews matters
concerning potential conflicts of interest at the request of the general
partner, which has sole discretion to determine which such matters to submit to
that committee. Any such matters approved by a majority vote of the Audit and
Conflicts Committee will be conclusively deemed (1) to be fair and reasonable to
us, (2) approved by all of our limited partners and (3) not a breach by the
general partner of any duties it may owe to us. However, it is possible that
such procedure in itself may constitute a conflict of interest.

COMPENSATION OF THE GENERAL PARTNER

     The general partner receives no remuneration in connection with our
management other than: (1) distributions in respect of its general and limited
partner interests in us and its nonmanaging interest in certain of our
subsidiaries; (2) incentive distributions in respect of its general partner
interest, as provided in our partnership agreement; and (3) reimbursement for
all direct and indirect costs and expenses incurred on our behalf, all selling,
general and administrative expenses incurred by the general partner for or on
our behalf and all other expenses necessary or appropriate to the conduct of the
business of, and allocable to, us, including, but not limited to, the management
fees paid by the general partner to El Paso Energy and its affiliates under our
management agreement.

                                       72
<PAGE>   77

EXECUTIVE COMPENSATION

     Our executive officers (who are also executive officers of the general
partner) are compensated by El Paso Energy (and, prior to consummation of El
Paso Energy's acquisition of Leviathan, were compensated by Leviathan's parent)
and do not receive compensation from the general partner or us for their
services in such capacities with the exception of awards pursuant to the Unit
Rights Appreciation Plan and Omnibus Plan discussed below.

     UNIT RIGHTS APPRECIATION PLAN

     In 1995, we adopted the Unit Rights Appreciation Plan to provide us with
the ability of making awards of unit rights to certain officers and employees of
the general partner or its affiliates as an incentive for these individuals to
continue in the service of us or our affiliates. Under the Unit Rights Plan, we
granted 1.2 million unit rights to certain officers and employees of the general
partner or its affiliates that provided for the right to purchase, or realize
the appreciation of, a preference unit or a common unit, pursuant to the
provisions of the Unit Rights Plan. The Unit Rights Plan was administered by a
committee of the Board of Directors of the general partner comprised of two or
more non-employee directors. The aggregate number of rights that could have been
issued pursuant to the Unit Rights Plan could not exceed 400,000 rights per
calendar year and 4 million rights over the term of that plan, subject to
adjustment. No participant could have been granted more than 400,000 rights in
any calendar year. The exercise price covered by the rights granted pursuant to
that plan was the closing price of the preference units as reported on the NYSE
on the date on which rights were granted pursuant to that plan.

     The exercise prices covered by these rights granted pursuant to this plan
ranged from $15.6875 to $21.50, the closing prices of the preference units as
reported on the NYSE on the grant date of the respective rights. As a result of
the "change of control" occurring upon the closing of El Paso Energy's
acquisition of Leviathan, the rights fully vested and the holders of those
rights elected to be paid $8.6 million, the amount equal to the difference
between the grant price of those rights and the average of the high and the low
sales price of the common units on the date of exercise. Upon the exercise of
all of the rights outstanding, that plan was terminated. We replaced that plan
with the Omnibus Plan described below.

     OMNIBUS PLAN

     In August 1998, we adopted the 1998 Omnibus Compensation Plan to provide us
with the ability to issue unit options to attract and retain the services of
knowledgeable officers and key management personnel. Unit options to purchase a
maximum of 3 million common units may be issued pursuant to the Omnibus Plan.
The Plan is administered by the Board. The Board interprets, prescribes, amends
and rescinds rules relating to the Omnibus Plan, selects eligible participants,
makes grants to participants who are not Section 16 insiders pursuant to the
Exchange Act, and takes all other actions necessary for the Omnibus Plan
administration, which actions shall be final and binding upon all the
participants.

     In August 1998, we granted 930,000 unit options to employees of our general
partner to purchase an equal number of common units at $27.1875 per unit
pursuant to the Omnibus Plan. These unit options, none of which are exercisable,
remain outstanding as of April 30, 1999.

     REPORT FROM COMPENSATION COMMITTEE REGARDING EXECUTIVE COMPENSATION

     Because we do not have a compensation committee or another committee
performing similar functions, this report is presented by the full Board of
Directors. The Board of Directors is responsible for establishing appropriate
compensation goals for the knowledgeable officers and key management personnel
working for us and evaluating the performance of such officers and personnel in
meeting such goals.

     The goals of the Board of Directors in administering the Omnibus Plan are
as follows:

          (1) To fairly compensate the knowledgeable officers and key management
     personnel working for us and our affiliates for their contributions to our
     short-term and long-term performance.
                                       73
<PAGE>   78

          (2) To allow us to attract, motivate and retain the management
     personnel necessary to our success by providing an Omnibus Plan comparable
     to that offered by companies with which we compete for such management
     personnel.

     The elements of the Omnibus Plan described above are implemented and
periodically reviewed and adjusted by the Board of Directors. The awards made
under the Omnibus Plan are determined based on individual performance,
experience and comparison with awards made by our industry peers and other
companies in similar industries with comparable revenue while linking such
awards to our achievement of certain financial goals.

SUMMARY COMPENSATION TABLE

     The following table sets forth information concerning the annual
compensation earned by our Chief Executive Officer and each of our other four
most highly compensated executive officers whose annual salary and bonus from us
during the year ended December 31, 1998 exceeded $100,000:

<TABLE>
<CAPTION>
                                                                                       LONG-TERM COMPENSATION
                                                   ANNUAL COMPENSATION(2)                      AWARDS
                                        --------------------------------------------   ----------------------
                                                         MARKET VALUE   OTHER ANNUAL              ALL OTHER
                               FISCAL   SALARY   BONUS     OF UNITS     COMPENSATION   OPTIONS   COMPENSATION
   NAME/PRINCIPAL POSITION      YEAR     ($)      ($)       ISSUED          ($)          (#)         ($)
   -----------------------     ------   ------   -----   ------------   ------------   -------   ------------
<S>                            <C>      <C>      <C>     <C>            <C>            <C>       <C>
Grant E. Sims................   1998       --      --          --             --       215,000(3)      --
  Chief Executive Officer       1997       --      --          --             --       125,000(4)      --
                                1996       --      --          --             --        90,000(4)      --
James H. Lytal...............   1998       --      --          --             --       215,000(3)      --
  President                     1997       --      --          --             --       125,000(4)      --
                                1996       --      --          --             --        90,000(4)      --
Keith B. Forman..............   1998       --      --          --             --       215,000(3)      --
  Chief Financial Officer       1997       --      --          --             --       125,000(4)      --
                                1996       --      --          --             --        90,000(4)      --
John H. Gray(1)..............   1998       --      --          --             --            --        --
  Chief Operating Officer       1997       --      --          --             --       125,000(4)      --
                                1996       --      --          --             --        90,000(4)      --
Donald V. Weir(1)............   1998       --      --          --             --            --        --
  Vice President                1997       --      --          --             --            --        --
                                1996       --      --          --             --            --        --
T. Darty Smith...............   1998       --      --          --             --        70,000(3)      --
  Vice President                1997       --      --          --             --        50,000(4)      --
                                1996       --      --          --             --        20,000(4)      --
Bart H. Heijermans...........   1998       --      --          --             --        40,000(3)      --
  Vice President                1997       --      --          --             --            --        --
                                1996       --      --          --             --            --        --
</TABLE>

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

(1) John H. Gray, our former Chief Operating Officer, and Donald V. Weir, our
    former Vice President, resigned their positions in connection with the
    consummation of El Paso Energy's acquisition of our general partner on
    August 14, 1998.

(2) Other than awards made under our incentive arrangements, all other
    compensation was paid by El Paso Energy and/or our previous parent.

(3) Issued pursuant to the Omnibus Plan.

(4) Issued pursuant to the Unit Rights Plan.

                                       74
<PAGE>   79

OPTION GRANTS

     The following table sets forth certain information concerning the unit
options granted to the named officers during the year ended December 31, 1998:

<TABLE>
<CAPTION>
                                                                                   POTENTIAL REALIZABLE
                                                                                  VALUE AT ASSUMED ANNUAL
                                         PERCENT OF                                 RATES OF UNIT PRICE
                                           TOTAL                                  APPRECIATION FOR OPTION
                         NUMBER OF        OPTIONS                                          TERM
                       COMMON UNITS      GRANTED TO    EXERCISE OR                -----------------------
                        UNDERLYING      EMPLOYEES IN   BASE PRICE    EXPIRATION       5%          10%
        NAME          OPTIONS GRANTED   FISCAL YEAR      ($/SH)         DATE         ($)          ($)
        ----          ---------------   ------------   -----------   ----------   ----------   ----------
<S>                   <C>               <C>            <C>           <C>          <C>          <C>
Grant E. Sims........     215,000(1)         23%        $27.1875     8/14/2008    $3,676,086   $9,315,923
James H. Lytal.......     215,000(1)         23%        $27.1875     8/14/2008    $3,676,086   $9,315,923
Keith B. Forman......     215,000(1)         23%        $27.1875     8/14/2008    $3,676,086   $9,315,923
T. Darty Smith.......      70,000(1)          8%        $27.1875     8/14/2008    $1,196,865   $3,033,091
Bart H. Heijermans...      40,000(1)          4%        $27.1875     8/14/2008    $  683,923   $1,733,195
</TABLE>

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

(1) These unit options were issued pursuant to the Omnibus Plan and are not
    immediately exercisable. One half of the unit options are considered vested
    and exercisable one year after at the date of grant and the remaining
    one-half of the units options are considered vested and exercisable one year
    after the first anniversary of the date of grant. The unit options shall
    expire 10 years from such grant date, but shall be subject to earlier
    termination in the event that a participant ceases employment with the
    general partner for retirement or disability, in which case the unit options
    expire 36 months after such date; for termination without cause, one year
    after such date; for voluntary termination, three months after such date;
    and death, twelve months after such date.

OPTION EXERCISES AND YEAR-END VALUE TABLE

     The following table sets forth certain information concerning the unit
options held by the relevant officers at December 31, 1998 or exercised by those
officers during the year then ended:

<TABLE>
<CAPTION>
                                                                                             VALUE OF
                                                                                            UNEXERCISED
                                                                                           IN-THE-MONEY
                                                                                         OPTIONS AT FISCAL
                                                                         NUMBER OF           YEAR-END
                                      SHARES ACQUIRED      VALUE        EXERCISABLE/       EXERCISABLE/
NAME                                  ON EXERCISE(#)    REALIZED($)   UNEXERCISABLE(2)     UNEXERCISABLE
- ----                                  ---------------   -----------   ----------------   -----------------
<S>                                   <C>               <C>           <C>                <C>
Grant E. Sims........................     215,000(1)    $1,745,938(1)    -- /215,000          -$-/$--
James H. Lytal.......................     215,000(1)     1,745,938(1)    -- /215,000          --/ --
Keith B. Forman......................     215,000(1)     1,745,938(1)    -- /215,000          --/ --
T. Darty Smith.......................      70,000(1)       416,875(1)     -- /70,000          --/ --
Bart H. Heijermans...................          --               --        -- /40,000          --/ --
</TABLE>

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

(1) As a result of the "change of control" occurring upon El Paso Energy's
    acquisition of our general partner, the rights issued pursuant to the Unit
    Rights Plan fully vested and the holders of the rights elected to be paid
    the amount equal to the difference between the grant price of the right and
    the average of the high and the low sales price of the common units on the
    date of exercise.

(2) All unexercisable options in this column relate to options issued pursuant
    to the Omnibus Plan.

                                       75
<PAGE>   80

                 CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

MANAGEMENT FEES


     Substantially all of the individuals who perform the day-to-day financial,
administrative, accounting and operational functions for us, as well as those
who are responsible for our direction are currently employed by El Paso Energy.
Under a management agreement between a subsidiary of El Paso Energy and our
general partner, a management fee is charged to our general partner which is
intended to approximate an allocation for the costs of resources allocated by El
Paso Energy and its affiliates in connection with operational, financial,
accounting and administrative matters. The management agreement expires on June
30, 2002, and may be terminated thereafter upon 90 days notice by either party.
Under our partnership agreement, our general partner is reimbursed for all
reasonable general and administrative expenses and other reasonable expenses
that it and its affiliates incur on our behalf, including amounts payable by our
general partner to a subsidiary of El Paso Energy under the management
agreement.



     In connection with El Paso Energy's acquisition of our general partner, our
general partner amended its management agreement to provide for a monthly
management fee of $775,000. Prior to that, the management fee represented an
allocation of costs attributable to our business, primarily based on a time and
space methodology. Effective November 1, 1995, July 1, 1996 and July 1, 1997,
primarily as a result of our increased activities, the annual management fee was
45.3%, 54.0% and 52.0% of such costs. Our general partner charged us $9.3
million, $8.1 million and $6.6 million under our management agreement for the
years ended December 31, 1998, 1997 and 1996, and $4.6 million and $4.7 million
for the six months ended June 30, 1998, and 1999.



     In addition, our general partner must reimburse El Paso Energy and its
affiliates for certain tax liabilities resulting from, among other things,
additional taxable income allocated to our general partner due to (1) the
issuance of additional preference units in 1994 and (2) the investment of such
proceeds in additional acquisitions or construction projects. During the years
ended December 31, 1998, 1997 and 1996, our general partner charged us $489,000,
$713,000 and approximately $1.2 million for additional taxable income allocated
to the general partner.


PLATFORM ACCESS AND TRANSPORTATION AGREEMENTS

     VIOSCA KNOLL. For the years ended December 31, 1998, 1997 and 1996, we
received approximately $1.1 million, $1.9 million and $1.9 million,
respectively, from Tatham Offshore as platform access and production handling
fees related to our platform located in Viosca Knoll Block 817.

     For the years ended December 31, 1998, 1997 and 1996, we charged Viosca
Knoll approximately $2.5 million, $2.1 million and $249,000, respectively, for
expenses and platform access fees related to the Viosca Knoll Block 817
platform.

     In addition, for the years ended December 31, 1998, 1997 and 1996, Viosca
Knoll reimbursed us $152,000, $47,000 and $254,000, respectively, for costs we
incurred in connection with the acquisition and installation of a booster
compressor on our Viosca Knoll Block 817 platform.

     During the years ended December 31, 1998, 1997 and 1996, Viosca Knoll
charged us approximately $1.9 million, $3.9 million and $3.2 million,
respectively, for transportation services related to transporting production
from the Viosca Knoll Block 817 lease.

     GARDEN BANKS. During the years ended December 31, 1998, 1997 and 1996,
Poseidon charged us approximately $1.4 million, $2.0 million and $1.0 million,
respectively, for transportation services related to transporting production
from the Garden Banks Block 72 and 117 leases.

OTHER

     We have agreed to sell all of our oil and natural gas production to
Offshore Gas Marketing, Inc. a wholly owned subsidiary of El Paso Energy, on a
month to month basis. This agreement provides Offshore

                                       76
<PAGE>   81

Gas Marketing fees equal to 2.0% of the sales value of crude oil and condensate
and $0.015 per dekatherm of natural gas for selling our production. During the
years ended December 31, 1998, 1997 and 1996, our oil and natural gas sales to
Offshore Gas Marketing totaled approximately $31.2 million, $57.8 million and
$46.2 million, respectively.

     We are party to a management agreement with Viosca Knoll under which we
charge Viosca Knoll a base fee of $100,000 annually in exchange for providing
financial, accounting and administrative services to Viosca Knoll. For each of
the years ended December 31, 1998, 1997 and 1996, we charged Viosca Knoll
$100,000 in accordance with this agreement.

     For the years ended December 31, 1998 and 1997, we charged Manta Ray
Offshore approximately $1.3 million and $287,000, respectively, under management
and operations agreements.

     In connection with El Paso Energy's acquisition of our general partner, Mr.
Grant E. Sims and Mr. James H. Lytal entered into employment agreements with
five year terms with El Paso Energy under which they would continue to serve as
our and our general partner's Chief Executive Officer and President,
respectively. However, under their respective employment agreements, Messrs.
Sims and Lytal have the right to terminate such agreements upon 30 days notice
and El Paso Energy has the right to terminate these agreements under certain
circumstances.

     Under our former non-employee director compensation arrangements, we were
obligated to pay each non-employee director 2.5% of the general partner's
incentive distribution as a profit participation fee. During the years ended
December 31, 1998 and 1997, we paid the three non-employee directors of
Leviathan a total of $621,000 and $313,000, respectively, as a profit
participation fee. As a result of El Paso Energy's acquisition of our general
partner, the three non-employee directors resigned and the compensation
arrangements were terminated.


     We reimburse affiliates of our general partner for costs related to
insurance and operational personnel that spend all of their time in connection
with our operations. During the last four months of 1998 and the six months
ended June 30, 1999, we reimbursed $660,000 and $1.1 million to these
affiliates.



VIOSCA KNOLL ACQUISITION



     We acquired 49.0% of the partnership interest in Viosca Knoll we did not
previously own and an option to acquire the remaining 1.0% from El Paso Energy
in June 1999 for $79.7 million comprised of $19.9 million in cash and $59.8
million in common units. See "Business -- Recent Developments, Acquisitions and
New Projects -- Viosca Knoll Transaction" beginning on page 48 and "-- Natural
Gas and Oil Pipelines -- Viosca Knoll System" beginning on page 52.



EWING BANK 958 UNIT ACQUISITION



     In October 1998, we purchased a 100% working interest in the Ewing Bank 958
Unit from a wholly owned, indirect subsidiary of El Paso Energy for $12.2
million. See "Business -- Recent Developments, Acquisitions and New
Projects -- Ewing Bank 958 Unit" beginning on page 49.


                                       77
<PAGE>   82

                             PRINCIPAL UNITHOLDERS


     The following table sets forth, as of August 1, 1999, the beneficial
ownership of our outstanding equity securities, by (1) each person who we know
to beneficially own more than 5.0% of our outstanding units, (2) each director
of the general partner and (3) all directors and executive officers of the
general partner as a group.



<TABLE>
<CAPTION>
                                                            COMMON UNITS       PREFERENCE UNITS
                                                         ------------------    -----------------
BENEFICIAL OWNER                                         NUMBER     PERCENT    NUMBER    PERCENT
- ----------------                                         ------     -------    ------    -------
<S>                                                      <C>        <C>        <C>       <C>
El Paso Energy(1)......................................        (1)    (1)       --         --
Grant E. Sims..........................................  33,000(2)     *        --         --
James H. Lytal.........................................  6,050(3)      *        --         --
Keith B. Forman........................................  1,000         *        --         --
Robert G. Phillips.....................................  1,000         *        --         --
William A. Wise........................................  9,670(4)      *        --         --
H. Brent Austin........................................  1,000         *        --         --
D. Mark Leland.........................................     --        --        --         --
Michael B. Bracy.......................................  6,500(5)      *        --         --
H. Douglas Church......................................  1,500(5)      *        --         --
Malcolm Wallop.........................................  1,500(5)      *        --         --
Executive officers and directors of Leviathan as a
  group (10 persons)...................................  61,220        *        --         --
</TABLE>


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

 *  Less than 1%.


(1) El Paso Energy beneficially owns all of the outstanding capital stock of our
    general partner, the general partner of Leviathan. The address for our
    general partner and El Paso Energy is El Paso Energy Building, 1001
    Louisiana Street, Houston, Texas 77002. El Paso Energy indirectly owns all
    of the general partner's outstanding common stock, par value $0.10 per
    share. The general partner has no other class of capital stock outstanding.
    As of August 1, 1999, our general partner, through its ownership of
    6,291,894 common units, its 1.0% general partner interest and its
    approximate 1.0% nonmanaging interest in certain of our subsidiaries,
    effectively owned a 27.3% interest in us. Another subsidiary of El Paso
    Energy owns 2,661,870 common units. As a result, El Paso Energy effectively
    owns a 34.5% interest in us.


(2) Mr. Sims disclaims beneficial ownership of 2,000 common units held in trust
    for his 18 year old son.

(3) Mr. Lytal may be deemed to be the beneficial owner of 34 common units owned
    by Mr. Lytal's son, a minor.

(4) This number excludes 3,625 units owned by Mr. Wise's children, for which he
    disclaims beneficial ownership.


(5) Includes the option to acquire 1,500 common units pursuant to the 1998 Unit
    Option Plan for Non-Employee Directors. See "Management -- Compensation of
    Directors" beginning on page 71.


                                       78
<PAGE>   83

                               THE EXCHANGE OFFER

EXCHANGE TERMS

     $175.0 million principal amount of Series A notes are currently issued and
outstanding. The maximum principal amount of Series B notes that will be issued
in exchange for Series A notes is $175.0 million. The terms of the Series B
notes and the Series A notes are substantially the same in all material
respects, except that the Series B notes will be freely transferable by the
holders except as provided in this prospectus.

     The Series B notes will bear interest at a rate of 10 3/8% per year,
payable semi-annually on June 1 and December 1 of each year, beginning on
December 1, 1999. Holders of Series B notes will receive interest from the date
of the original issuance of the Series A notes or from the date of the last
payment of interest on the Series A notes, whichever is later. Holders of Series
B notes will not receive any interest on Series A notes tendered and accepted
for exchange. In order to exchange your Series A notes for transferable Series B
notes in the exchange offer, you will be required to make the following
representations:

     - any Series B notes will be acquired in the ordinary course of your
       business;

     - you have no arrangement with any person to participate in the
       distribution of the Series B notes; and

     - you are not our "affiliate," as defined in Rule 405 of the Securities
       Act, or if you are our affiliate, you will comply with the applicable
       registration and prospectus delivery requirements of the Securities Act.


     Upon the terms and subject to the conditions set forth in this prospectus
and in the letter of transmittal, we will accept for exchange any Series A notes
properly tendered in the exchange offer, and the Exchange Agent will deliver the
Series B notes promptly after the expiration date of the exchange offer. We
expressly reserve the right to delay acceptance of any of the tendered Series A
notes or terminate the exchange offer and not accept for exchange any tendered
Series A notes not already accepted if any conditions set forth under
"Conditions of the Exchange Offer" beginning on page 85 have not been satisfied
or waived by us or do not comply, in whole or in part, with any applicable law.


     If you tender your Series A notes, you will not be required to pay
brokerage commissions or fees or, subject to the instructions in the letter of
transmittal, transfer taxes with respect to the exchange of the Series A notes.
We will pay all charges, expenses and transfer taxes in connection with the
exchange offer, other than certain taxes described below under "Transfer Taxes."

EXPIRATION DATE; EXTENSIONS; TERMINATION; AMENDMENTS


     The exchange offer will expire on the expiration date, which is at 5:00
p.m., New York City time, on September 27, 1999, unless extended by us. We
expressly reserve the right to extend the exchange offer on a daily basis or for
such period or periods as we may determine in our sole discretion from time to
time by giving oral, confirmed in writing, or written notice to the exchange
agent and by making a public announcement by press release to the Dow Jones News
Service prior to 9:00 a.m., New York City time, on the first business day
following the previously scheduled expiration date. During any extension of the
exchange offer, all Series A notes previously tendered, not validly withdrawn
and not accepted for exchange will remain subject to the exchange offer and may
be accepted for exchange by us.


     To the extent we are legally permitted to do so, we expressly reserve the
absolute right, in our sole discretion, to:

     - waive any condition to the exchange offer and

     - amend any of the terms of the exchange offer.

                                       79
<PAGE>   84

     Any waiver or amendment to the exchange offer will apply to all Series A
notes tendered, regardless of when or in what order the Series A notes were
tendered. If we make a material change in the terms of the exchange offer or if
we waive a material condition of the exchange offer, we will disseminate
additional exchange offer materials, and we will extend the exchange offer to
the extent required by law.


     We expressly reserve the right, in our sole discretion, to terminate the
exchange offer if any of the conditions set forth under "Conditions of the
Exchange Offer" beginning on page 85 exist. Any such termination will be
followed promptly by a public announcement. In the event we terminate the
exchange offer, we will give immediate notice to the exchange agent, and all
Series A notes previously tendered and not accepted for payment will be returned
promptly to the tendering holders.


     In the event that the exchange offer is withdrawn or otherwise not
completed, Series B notes will not be given to holders of Series A notes who
have validly tendered their Series A notes.

RESALE OF SERIES B NOTES

     Based on interpretations of the SEC staff set forth in no action letters
issued to third parties, we believe that Series B notes issued under the
exchange offer in exchange for Series A notes may be offered for resale, resold
and otherwise transferred by you without compliance with the registration and
prospectus delivery provisions of the Securities Act, if:

     - you are not our "affiliate" within the meaning of Rule 405 under the
       Securities Act;


     - you are acquiring Series B notes in the ordinary course of your business;
       and



     - you do not intend to participate in the distribution of the Series B
       notes; or



     - if you are an initial purchaser or a broker-dealer who is receiving
       Series B notes in exchange for Series A notes that you acquired as a
       result of market-making or other trading activities, you will comply with
       the registration and prospectus delivery requirements of the Securities
       Act to the extent applicable.


     If you tender Series A notes in the exchange offer with the intention of
participating in any manner in a distribution of the Series B notes:

     - you cannot rely on those interpretations by the SEC staff, and

     - you must comply with the registration and prospectus delivery
       requirements of the Securities Act in connection with a secondary resale
       transaction and that such a secondary resale transaction must be covered
       by an effective registration statement containing the selling security
       holder information required by Item 507 or 508, as applicable, of
       Regulation S-K.


     Unless an exemption from registration is otherwise available, any security
holder intending to distribute Series B notes should be covered by an effective
registration statement under the Securities Act containing the selling security
holder's information required by Item 507 of Regulation S-K under the Securities
Act. This prospectus may be used for an offer to resell, a resale or other
retransfer of Series B notes only as specifically set forth in this prospectus.
If you are a broker-dealer, you may only participate in the exchange offer if
you acquired the Series A notes as a result of market-making activities or other
trading activities. Each broker-dealer that receives Series B notes for its own
account in exchange for Series A notes, where such Series A notes were acquired
by such broker-dealer as a result of market-making activities or other trading
activities, must acknowledge that it will deliver a prospectus in connection
with any resale of the Series B notes. Please read the section captioned "Plan
of Distribution" beginning on page 142 for more details regarding the transfer
of Series B notes.


                                       80
<PAGE>   85

ACCEPTANCE OF SERIES A NOTES FOR EXCHANGE


     We will accept for exchange Series A notes validly tendered pursuant to the
exchange offer, or defectively tendered, if such defect has been waived by us or
satisfied, on the expiration date if the conditions specified below under
"Conditions of the Exchange Offer" have been satisfied or waived. We will not
accept Series A notes for exchange subsequent to the expiration date. Tenders of
Series A notes will be accepted only in principal amounts equal to $1,000 or
integral multiples of $1,000.


     We expressly reserve the right, in our sole discretion, to:

     - delay acceptance for exchange of Series A notes tendered under the
       exchange offer, subject to Rule 14e-1 under the Exchange Act, which
       requires that an offeror pay the consideration offered or return the
       securities deposited by or on behalf of the holders promptly after the
       termination or withdrawal of a tender offer, or


     - terminate the exchange offer and not accept for exchange any Series A
       notes not theretofore accepted for exchange, if any of the conditions set
       forth below under "Conditions of the Exchange Offer" have not been
       satisfied or waived by us or in order to comply in whole or in part with
       any applicable law. In all cases, Series B notes will be issued only
       after timely receipt by the exchange agent of certificates representing
       Series A notes, or confirmation of book-entry transfer, a properly
       completed and duly executed letter of transmittal, or a manually signed
       facsimile thereof, and any other required documents. For purposes of the
       exchange offer, on the expiration date, we will be deemed to have
       accepted for exchange validly tendered Series A notes, or defectively
       tendered Series A notes with respect to which we have waived such defect,
       if, as and when we give oral, confirmed in writing, or written notice to
       the exchange agent. Promptly after the expiration date, we will deposit
       the Series B notes with the exchange agent, who will act as agent for the
       tendering holders for the purpose of receiving the Series B notes and
       transmitting them to the holders. The exchange agent will deliver the
       Series B notes to holders of Series A notes accepted for exchange after
       the exchange agent receives the Series B notes.



     If, for any reason, we delay acceptance for exchange of validly tendered
Series A notes or we are unable to accept for exchange validly tendered Series A
notes, then the exchange agent may, nevertheless, on our behalf, retain tendered
Series A notes, without prejudice to our rights described under "Expiration
Date; Extensions; Termination; Amendments" beginning on page 79, "Conditions of
the Exchange Offer" beginning on page 85 and "Withdrawal of Tenders" beginning
on page 84, subject to Rule 14e-1 under the Exchange Act, which requires that an
offeror pay the consideration offered or return the securities deposited by or
on behalf of the holders thereof promptly after the termination or withdrawal of
a tender offer.



     If any tendered Series A notes are not accepted for exchange for any
reason, or if certificates are submitted evidencing more Series A notes than
those that are tendered, certificates evidencing Series A notes that are not
exchanged will be returned, without expense, to the tendering holder or, in the
case of Series A notes tendered by book-entry transfer into the exchange agent's
account, at a book-entry transfer facility under the procedure set forth under
"Procedures for Tendering Series A Notes -- Book-Entry Transfer" beginning on
page 83, such Series A notes will be credited to the account maintained at such
book-entry transfer facility from which such Series A notes were delivered,
unless otherwise requested by such holder under "Special Delivery Instructions"
in the letter of transmittal, promptly following the expiration date or the
termination of the exchange offer.



     Tendering holders of Series A notes exchanged in the exchange offer will
not be obligated to pay brokerage commissions or transfer taxes with respect to
the exchange of their Series A notes other than as described in "Transfer Taxes"
beginning on page 86 or in Instruction 7 to the letter of transmittal. We will
pay all other charges and expenses in connection with the exchange offer.


                                       81
<PAGE>   86

PROCEDURES FOR TENDERING SERIES A NOTES

     Any beneficial owner whose Series A notes are registered in the name of a
broker, dealer, commercial bank, trust company or other nominee or held through
a book-entry transfer facility and who wishes to tender Series A notes should
contact such registered holder promptly and instruct such registered holder to
tender Series A notes on such beneficial owner's behalf.


     Tender of Series A Notes Held Through DTC. The exchange agent and the
Depository Trust Company, known as DTC have confirmed that the exchange offer is
eligible for the DTC automated tender offer program. Accordingly, DTC
participants may electronically transmit their acceptance of the exchange offer
by causing DTC to transfer Series A notes to the exchange agent in accordance
with DTC's automated tender offer program procedures for transfer. DTC will then
send an agent's message to the exchange agent.



     The term "agent's message" means a message transmitted by DTC, received by
the exchange agent and forming part of the book-entry confirmation, which states
that DTC has received an express acknowledgment from the participant in DTC
tendering Series A notes that are the subject of that book-entry confirmation
that the participant has received and agrees to be bound by the terms of the
letter of transmittal, and that we may enforce such agreement against such
participant. In the case of an agent's message relating to guaranteed delivery,
the term means a message transmitted by DTC and received by the exchange agent,
which states that DTC has received an express acknowledgment from the
participant in DTC tendering Series A notes that they have received and agree to
be bound by the notice of guaranteed delivery.


     Tender of Series A Notes Held in Physical Form. For a holder to validly
tender Series A notes held in physical form:


     - the exchange agent must receive at its address set forth in this
       prospectus a properly completed and validly executed letter of
       transmittal, or a manually signed facsimile thereof, together with any
       signature guarantees and any other documents required by the instructions
       to the letter of transmittal, and



     - the exchange agent must receive certificates for tendered Series A notes
       at such address, or such Series A notes must be transferred pursuant to
       the procedures for book-entry transfer described above. A confirmation of
       such book-entry transfer must be received by the exchange agent prior to
       the expiration date. A holder who desires to tender Series A notes and
       who cannot comply with the procedures set forth herein for tender on a
       timely basis or whose Series A notes are not immediately available must
       comply with the procedures for guaranteed delivery set forth below.



     LETTERS OF TRANSMITTAL AND SERIES A NOTES SHOULD BE SENT ONLY TO THE
EXCHANGE AGENT, AND NOT TO US OR TO ANY BOOK-ENTRY TRANSFER FACILITY.



     THE METHOD OF DELIVERY OF SERIES A NOTES, LETTERS OF TRANSMITTAL AND ALL
OTHER REQUIRED DOCUMENTS TO THE EXCHANGE AGENT IS AT THE ELECTION AND RISK OF
THE HOLDER TENDERING SERIES A NOTES. DELIVERY OF SUCH DOCUMENTS WILL BE DEEMED
MADE ONLY WHEN ACTUALLY RECEIVED BY THE EXCHANGE AGENT. IF SUCH DELIVERY IS BY
MAIL, WE SUGGEST THAT THE HOLDER USE PROPERLY INSURED, REGISTERED MAIL WITH
RETURN RECEIPT REQUESTED, AND THAT THE MAILING BE MADE SUFFICIENTLY IN ADVANCE
OF THE EXPIRATION DATE OF THE EXCHANGE OFFER TO PERMIT DELIVERY TO THE EXCHANGE
AGENT PRIOR TO SUCH DATE. NO ALTERNATIVE, CONDITIONAL OR CONTINGENT TENDERS OF
SERIES A NOTES WILL BE ACCEPTED.


     Signature Guarantees. Signatures on the letter of transmittal must be
guaranteed by an eligible institution unless:

     - the letter of transmittal is signed by the registered holder of the
       Series A notes tendered therewith, or by a participant in one of the
       book-entry transfer facilities whose name appears on a security position
       listing it as the owner of those Series A notes, or if any Series A notes
       for principal amounts not tendered are to be issued directly to the
       holder, or, if tendered by a participant in one of the book-entry
       transfer facilities, any Series A notes for principal amounts not
       tendered or not
                                       82
<PAGE>   87

       accepted for exchange are to be credited to the participant's account at
       the book-entry transfer facility, and neither the "Special Issuance
       Instructions" nor the "Special Delivery Instructions" box on the letter
       of transmittal has been completed, or

     - the Series A notes are tendered for the account of an eligible
       institution.

An eligible institution is a firm that is a participant in the Security Transfer
Agents Medallion Program or the Stock Exchange Medallion Program, which is
generally a member of a registered national securities exchange, a member of the
National Association of Securities Dealers, Inc., or a commercial bank or trust
company having an office in the United States.


     Book-Entry Transfer. The exchange agent will seek to establish a new
account or utilize an existing account with respect to the Series A notes at DTC
promptly after the date of this prospectus. Any financial institution that is a
participant in the book-entry transfer facility system and whose name appears on
a security position listing it as the owner of the Series A notes may make
book-entry delivery of Series A notes by causing the book-entry transfer
facility to transfer such Series A notes into the exchange agent's account.
HOWEVER, ALTHOUGH DELIVERY OF SERIES A NOTES MAY BE EFFECTED THROUGH BOOK-ENTRY
TRANSFER INTO THE EXCHANGE AGENT'S ACCOUNT AT A BOOK-ENTRY TRANSFER FACILITY, A
PROPERLY COMPLETED AND VALIDLY EXECUTED LETTER OF TRANSMITTAL, OR A MANUALLY
SIGNED FACSIMILE THEREOF, MUST BE RECEIVED BY THE EXCHANGE AGENT AT ONE OF ITS
ADDRESSES SET FORTH IN THIS PROSPECTUS ON OR PRIOR TO THE EXPIRATION DATE, OR
ELSE THE GUARANTEED DELIVERY PROCEDURES DESCRIBED BELOW MUST BE COMPLIED WITH.
The confirmation of a book-entry transfer of Series A notes into the exchange
agent's account at a book- entry transfer facility is referred to in this
prospectus as a "book-entry confirmation." Delivery of documents to the
book-entry transfer facility in accordance with that book-entry transfer
facility's procedures does not constitute delivery to the exchange agent.


     Guaranteed Delivery. If you wish to tender your Series A notes and:

     (1) certificates representing your Series A notes are not lost but are not
         immediately available,


     (2) time will not permit your letter of transmittal, certificates
         representing your Series A notes and all other required documents to
         reach the exchange agent on or prior to the expiration date, or



     (3) the procedures for book-entry transfer cannot be completed on or prior
         to the expiration date, you may tender if all of the following are
         complied with:


        - your tender is made by or through an eligible institution;


        - on or prior to the expiration date, the exchange agent has received
          from the eligible institution a properly completed and validly
          executed notice of guaranteed delivery, by manually signed facsimile
          transmission, mail or hand delivery, in substantially the form
          provided with this prospectus. The notice of guaranteed delivery must:


         (a) set forth your name and address, the registered number(s) of your
             Series A notes and the principal amount of Series A notes tendered,

         (b) state that the tender is being made thereby and


         (c) guarantee that, within three New York Stock Exchange trading days
             after the date of the notice of guaranteed delivery, the letter of
             transmittal or facsimile thereof properly completed and validly
             executed, together with certificates representing the Series A
             notes, or a book-entry confirmation, and any other documents
             required by the letter of transmittal and the instructions thereto,
             will be deposited by the eligible institution with the exchange
             agent; and



         (d) the exchange agent receives the properly completed and validly
             executed letter of transmittal or facsimile thereof with any
             required signature guarantees, together with certificates for all
             Series A notes in proper form for transfer, or a book-entry
             confirmation,


                                       83
<PAGE>   88

              and any other required documents, within three New York Stock
              Exchange trading days after the date of the notice of guaranteed
              delivery.


     Other Matters. Series B notes will be issued in exchange for Series A notes
accepted for exchange only after timely receipt by the exchange agent of:


     - certificates for (or a timely book-entry confirmation with respect to)
       your Series A notes,

     - a properly completed and duly executed letter of transmittal or facsimile
       thereof with any required signature guarantees, or, in the case of a
       book-entry transfer, an agent's message, and

     - any other documents required by the letter of transmittal.

     All questions as to the form of all documents and the validity, including
time of receipt, and acceptance of all tenders of Series A notes will be
determined by us, in our sole discretion, the determination of which shall be
final and binding. ALTERNATIVE, CONDITIONAL OR CONTINGENT TENDERS OF SERIES A
NOTES WILL NOT BE CONSIDERED VALID. We reserve the absolute right to reject any
or all tenders of Series A notes that are not in proper form or the acceptance
of which, in our opinion, would be unlawful. We also reserve the right to waive
any defects, irregularities or conditions of tender as to particular Series A
notes.

     Our interpretation of the terms and conditions of the exchange offer,
including the instructions in the letter of transmittal, will be final and
binding.


     Any defect or irregularity in connection with tenders of Series A notes
must be cured within the time we determine, unless waived by us. Tenders of
Series A notes will not be deemed to have been made until all defects and
irregularities have been waived by us or cured. Neither we, the exchange agent,
or any other person will be under any duty to give notice of any defects or
irregularities in tenders of Series A notes, or will incur any liability to
holders for failure to give any such notice.


     By signing or agreeing to be bound by the letter of transmittal, you will
represent to us that, among other things:

     - any Series B notes that you receive will be acquired in the ordinary
       course of your business;

     - you have no arrangement or understanding with any person or entity to
       participate in the distribution of the Series B notes;

     - if you are not a broker-dealer, that you are not engaged in and do not
       intend to engage in the distribution of the Series B notes;

     - if you are a broker-dealer that will receive Series B notes for your own
       account in exchange for Series A notes that were acquired as a result of
       market-making activities, that you will deliver a prospectus, as required
       by law, in connection with any resale of those Series B notes; and

     - you are not our "affiliate," as defined in Rule 405 of the Securities
       Act, or, if you are an affiliate, you will comply with any applicable
       registration and prospectus delivery requirements of the Securities Act.

WITHDRAWAL OF TENDERS


     You may withdraw your tender of Series A notes at any time prior to the
expiration date.


     For a withdrawal to be effective:


     - the exchange agent must receive a written notice of withdrawal at one of
       the addresses set forth below under "-- Exchange Agent" on page 87, or


     - you must comply with the appropriate procedures of DTC's automated tender
       offer program system.

                                       84
<PAGE>   89

     Any notice of withdrawal must:

     - specify the name of the person who tendered the Series A notes to be
       withdrawn and

     - identify the Series A notes to be withdrawn, including the principal
       amount of the Series A notes.

     If Series A notes have been tendered pursuant to the procedure for
book-entry transfer described above, any notice of withdrawal must specify the
name and number of the account at DTC to be credited with the withdrawn Series A
notes and otherwise comply with the procedures of DTC.

     We will determine all questions as to the validity, form, eligibility and
time of receipt of notice of withdrawal, and our determination shall be final
and binding on all parties. We will deem any Series A notes so withdrawn not to
have been validly tendered for exchange for purposes of the exchange offer.


     Any Series A notes that have been tendered for exchange but that are not
exchanged for any reason will be returned to their holder without cost to the
holder or, in the case of Series A notes tendered by book-entry transfer into
the exchange agent's account at DTC according to the procedures described above,
such Series A notes will be credited to an account maintained with DTC for the
Series A notes. This return or crediting will take place as soon as practicable
after withdrawal, rejection of tender or termination of the exchange offer. You
may retender properly withdrawn Series A notes by following one of the
procedures described under "-- Procedures for Tendering Series A Notes"
beginning on page 82 at any time on or prior to the expiration date.


CONDITIONS OF THE EXCHANGE OFFER


     We will not be required to accept for exchange, or exchange any Series B
notes for, any Series A notes tendered, and we may terminate, extend or amend
the exchange offer and may, subject to Rule 14e-1 under the Exchange Act, which
requires that an offeror pay the consideration offered or return the securities
deposited by or on behalf of the holders thereof promptly after the termination
or withdrawal of a tender offer, postpone the acceptance for exchange of Series
A notes so tendered if, on or prior to the expiration date, the following shall
have occurred:



     - we have determined that the offering and sales under the registration
       statement, the filing of such registration statement or the maintenance
       of its effectiveness would require disclosure of or would interfere in
       any material respect with any material financing, merger, offering or
       other transaction involving the issuers or the subsidiary guarantors of
       the notes or would otherwise require disclosure of nonpublic information
       that could materially and adversely affect the issuers or the subsidiary
       guarantors; or



     - we are required by any state or federal securities laws to file an
       amendment or supplement to the registration statement for the purpose of
       incorporating quarterly or annual information, which is not automatically
       effective.


     The conditions to the exchange offer are for our sole benefit and may be
asserted by us in our sole discretion or may be waived by us, in whole or in
part, in our sole discretion, whether or not any other condition of the exchange
offer also is waived. We have not made a decision as to what circumstances would
lead us to waive any condition, and any waiver would depend on circumstances
prevailing at the time of that waiver. Any determination by us concerning the
events described in this section shall be final and binding upon all persons.

     ALTHOUGH WE HAVE NO PRESENT PLANS OR ARRANGEMENTS TO DO SO, WE RESERVE THE
RIGHT TO AMEND, AT ANY TIME, THE TERMS OF THE EXCHANGE OFFER. WE WILL GIVE
HOLDERS NOTICE OF ANY AMENDMENTS IF REQUIRED BY APPLICABLE LAW.

                                       85
<PAGE>   90

TRANSFER TAXES

     We will pay all transfer taxes applicable to the transfer and exchange of
Series A notes pursuant to the exchange offer. If, however:

     - delivery of the Series B notes, and/or certificates for Series A notes
       for principal amounts not exchanged, are to be made to any person other
       than the record holder of the Series A notes tendered;

     - tendered certificates for Series A notes are recorded in the name of any
       person other than the person signing any letter of transmittal; or

     - a transfer tax is imposed for any reason other than the transfer and
       exchange of Series A notes to us or our order,

the amount of any such transfer taxes, whether imposed on the recordholder or
any other person, will be payable by the tendering holder prior to the issuance
of the Series B notes.

CONSEQUENCES OF FAILURE TO EXCHANGE

     If you do not exchange your Series A notes for Series B notes in the
exchange offer, you will remain subject to the restrictions on transfer of the
Series A notes:

     - as set forth in the legend printed on the notes as a consequence of the
       issuance of the Series A notes pursuant to the exemptions from, or in
       transactions not subject to, the registration requirements of the
       Securities Act and applicable state securities laws; and

     - otherwise set forth in the memorandum distributed in connection with the
       private offering of the Series A notes.


     In general, you may not offer or sell the Series A notes unless they are
registered under the Securities Act, or if the offer or sale is exempt from
registration under the Securities Act and applicable state securities laws.
Except as required by the registration rights agreement, we do not intend to
register resales of the Series A notes under the Securities Act. Based on
interpretations of the SEC staff, you may offer for resale, resell or otherwise
transfer Series B notes issued in the exchange offer without compliance with the
registration and prospectus delivery provisions of the Securities Act, provided
that (1) you are not our "affiliate" within the meaning of Rule 405 under the
Securities Act, (2) you acquired the Series B notes in the ordinary course of
your business, (3) you have no arrangement or understanding with respect to the
distribution of the Series B notes to be acquired in the exchange offer, and (4)
you are not a broker-dealer receiving Series B notes in exchange for Series A
notes you acquired in market-making or other trading activities. If you tender
Series A notes in the exchange offer for the purpose of participating in a
distribution of the Series B notes:


     - you cannot rely on the applicable interpretations of the SEC; and

     - you must comply with the registration and prospectus delivery
       requirements of the Securities Act in connection with a secondary resale
       transaction and that such a secondary resale transaction must be covered
       by an effective registration statement containing the selling security
       holder information required by Item 507 or 508, as applicable, of
       Regulation S-K.

                                       86
<PAGE>   91

EXCHANGE AGENT


     Chase Bank of Texas, N.A. has been appointed as exchange agent for the
exchange offer. You should direct questions and requests for assistance,
requests for additional copies of this prospectus, the letter of transmittal or
any other documents to the exchange agent. You should send certificates for
Series A notes, letters of transmittal and any other required documents to the
exchange agent addressed as follows:


                   CHASE BANK OF TEXAS, NATIONAL ASSOCIATION

<TABLE>
<S>                                            <C>
       By Registered or Certified Mail
            or Overnight Courier:                            By Hand in Dallas:
          Chase Bank of Texas, N.A.                      Chase Bank of Texas, N.A.
          Corporate Trust Operations                     Corporate Trust Operations
                P.O. Box 2320                                 1201 Main Street
           Dallas, Texas 75221-2320                         Dallas, Texas 75202
                1-800-275-2048                                 1-800-275-2048
              Attn: Frank Ivins                              Attn: Frank Ivins
</TABLE>

                                 By Facsimile:
                        (for eligible institutions only)
                                 (214) 672-5746

                             Confirm by Telephone:
                                 (214) 672-5678

                                       87
<PAGE>   92

                              DESCRIPTION OF NOTES

     You can find the definitions of certain terms used in this description
under the subheading "Certain Definitions." In this description, the word
"issuers" refers only to Leviathan and Leviathan Finance and not to any of their
subsidiaries and any reference to "Leviathan" or "Leviathan Finance" does not
include any of their respective subsidiaries.

     The issuers issued the Series A notes under an Indenture (the "Indenture")
dated May 27, 1999 among the issuers, the Subsidiary Guarantors and Chase Bank
of Texas, National Association, as trustee (the "Trustee") in a private
transaction that was not subject to the registration requirements of the
Securities Act. The Series B notes will be issued under the same Indenture. The
terms of the notes include those stated in the Indenture and those made part of
the Indenture by reference to the Trust Indenture Act of 1939 (the "Trust
Indenture Act").


     The following description is a summary of the material provisions of the
Indenture. It does not restate that agreement in its entirety. We urge you to
read the Indenture because it, and not this description, defines your rights as
holders of these notes. The Indenture has been filed with the SEC and copies are
available upon request from Leviathan. Certain terms used herein are defined
below under "-- Certain Definitions" beginning on page 115.


GENERAL

     The Series A notes and the Series B notes will constitute a single class of
debt securities under the Indenture. If the exchange offer is completed, holders
of Series A notes who do not exchange their Series A notes for Series B notes
will vote together with holders of the Series B notes for all relevant purposes
under the Indenture. In that regard, the Indenture requires that certain actions
by holders, including acceleration following an event of default, must be taken,
and certain rights must be exercised, by specified minimum percentages of the
aggregate principal amount of the outstanding securities issued under the
Indenture. In determining whether the required holders have given any notice,
consent or waiver or taken any other action permitted under the Indenture, any
Series A notes that remain outstanding after the exchange offer will be
aggregated with the Series B notes, and the holders of the Series A notes and
the Series B notes will vote together as a single series. All references in this
prospectus to specified percentages in aggregate principal amount of the notes
means, at any time after the exchange offer is completed, the percentages in
aggregate principal amount of the Series A notes and the Series B notes
collectively then outstanding.

     The term "notes" as used in this prospectus refers collectively to the
Series A notes and the Series B notes.

BRIEF DESCRIPTION OF THE NOTES AND THE GUARANTEES

  The Notes

     These notes:

     - are general unsecured obligations of the issuers;

     - are subordinated in right of payment to all existing and future Senior
       Debt of the issuers, including borrowings under the Leviathan Credit
       Facility;

     - are senior or equal in right of payment to any future subordinated
       Indebtedness of the issuers; and

     - are unconditionally guaranteed by the Subsidiary Guarantors.

  The Guarantees

     These notes are guaranteed by the following subsidiaries of Leviathan:

     - Delos Offshore Company, L.L.C.,

     - Ewing Bank Gathering Company, L.L.C.,

     - Flextrend Development Company, L.L.C.,

                                       88
<PAGE>   93

     - Green Canyon Pipe Line Company, L.L.C.,

     - Leviathan Oil Transport Systems, L.L.C.,


     - Leviathan Operating Company, L.L.C.,


     - Manta Ray Gathering Company, L.L.C.,


     - Moray Pipeline Company, L.L.C.,



     - Natoco, L.L.C.,


     - Poseidon Pipeline Company, L.L.C.,

     - Sailfish Pipeline Company, L.L.C.,

     - Stingray Holding, L.L.C.,

     - Tarpon Transmission Company,

     - Transco Hydrocarbons Company, L.L.C.,

     - Texam Offshore Gas Transmission, L.L.C.,

     - Transco Offshore Pipeline Company, L.L.C.,


     - UTOS Holding, L.L.C.,


     - VK Deepwater Gathering Company, L.L.C.,

     - VK-Main Pass Gathering Company, L.L.C., and

     - Viosca Knoll Gathering Company.

     Each Guarantee of a Subsidiary Guarantor of these notes:

     - is a general unsecured obligation of that Subsidiary Guarantor;

     - is subordinated in right of payment to all existing and future Senior
       Debt of that Subsidiary Guarantor; and

     - is senior or equal in right of payment to any future subordinated
       Indebtedness of that Subsidiary Guarantor.


     As of August 9, 1999, the issuers and the Subsidiary Guarantors had total
Senior Debt of $300.0 million. As indicated above and as discussed in detail
below under the subheading "Subordination," payments on the notes will be
subordinated to the payment of Senior Debt. The Indenture will permit Leviathan
and the Subsidiary Guarantors to incur additional Senior Debt. The Guarantee of
each Subsidiary Guarantor will be subordinated to all Senior Debt of that
Subsidiary Guarantor. As a result of Leviathan's acquisition of an additional
interest in Viosca Knoll Gathering Company, Viosca Knoll became a Subsidiary of
Leviathan and a guarantor of the Leviathan Credit Facility and, therefore, a
Subsidiary Guarantor of these notes.


     As of the date of the Indenture, all of our Subsidiaries (other than
Leviathan Finance) will be "Restricted Subsidiaries." Certain Subsidiaries in
the future may not be Subsidiary Guarantors. Also, under the circumstances
described below under the subheading "Certain Covenants -- Designation of
Restricted and Unrestricted Subsidiaries," we will be permitted to designate
certain of our Subsidiaries as "Unrestricted Subsidiaries." Unrestricted
Subsidiaries will not be subject to many of the restrictive covenants in the
Indenture. Unrestricted Subsidiaries will not guarantee the notes. In addition,
Leviathan has invested, and may invest in the future, in Joint Ventures. The
rights of Leviathan to receive assets from any Subsidiary that is not a
Subsidiary Guarantor or from any Joint Venture that are attributable to
Leviathan's Equity Interests therein (and thus the ability of the holders of the
notes to benefit indirectly from such assets) are subject to the claims of all
existing and future third party indebtedness and liabilities (including trade
debt) of such Subsidiary or Joint Venture.

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<PAGE>   94

PRINCIPAL, MATURITY AND INTEREST

     The issuers will issue notes with a maximum aggregate principal amount of
$175.0 million. The issuers will issue notes in denominations of $1,000 and
integral multiples of $1,000. The notes will mature on June 1, 2009.

     Interest on these notes will accrue at the rate of 10 3/8% per annum and
will be payable semi-annually in arrears on June 1 and December 1, commencing on
December 1, 1999. The issuers will make each interest payment to the holders of
record of these notes on the immediately preceding May 15 and November 15.

     Interest on these notes will accrue from the date of original issuance or,
if interest has already been paid, from the date it was most recently paid.
Interest will be computed on the basis of a 360-day year comprised of twelve
30-day months.

METHODS OF RECEIVING PAYMENTS ON THE NOTES

     If a holder has given wire transfer instructions to the issuers, the
issuers will make all payments of principal of, premium, if any, and interest
and Liquidated Damages, if any, on the notes in accordance with those
instructions. All other payments on these notes will be made at the office or
agency of the Paying Agent and Registrar within the City and State of New York
unless the issuers elect to make interest payments by check mailed to the
holders at their address set forth in the register of holders.

PAYING AGENT AND REGISTRAR FOR THE NOTES

     The Trustee will initially act as Paying Agent and Registrar. The issuers
may change the Paying Agent or Registrar without prior notice to the holders of
the notes, and the issuers or any of their Subsidiaries may act as Paying Agent
or Registrar.

TRANSFER AND EXCHANGE

     A holder may transfer or exchange notes in accordance with the Indenture.
The Registrar and the Trustee may require a holder, among other things, to
furnish appropriate endorsements and transfer documents and the issuers may
require a holder to pay any taxes and fees required by law or permitted by the
Indenture. The issuers are not required to transfer or exchange any note
selected for redemption or repurchase (except in the case of a note to be
redeemed or repurchased in part, the portion not to be redeemed or repurchased).
Also, the issuers are not required to transfer or exchange any note for a period
of 15 days before a selection of notes to be redeemed or between a record date
and the next succeeding interest payment date.

     The registered holder of a note will be treated as the owner of it for all
purposes.

SUBORDINATION

     The payment of principal of, premium, if any, and interest and Liquidated
Damages, if any, and other Obligations on, the notes, including upon the
acceleration or redemption of the notes, will be subordinated to the prior
payment in full in cash of all Senior Debt of the issuers.

     The holders of Senior Debt of the issuers will be entitled to receive
payment in full in cash of all Obligations due in respect of Senior Debt
(including interest after the commencement of any of the following specified
proceedings at the rate specified in the applicable Senior Debt, whether or not
such interest would be an allowed claim in such proceeding), before the holders
of notes will be entitled to receive any payment or distribution with respect to
the notes (except that holders of notes may receive and retain Permitted Junior
Securities and payments made from the trust described under "-- Legal

                                       90
<PAGE>   95

Defeasance and Covenant Defeasance," provided that the funding of such trust was
permitted), in the event of any payment or distribution to creditors of an
issuer:

          (1) in a liquidation or dissolution of that issuer;

          (2) in a bankruptcy, reorganization, insolvency, receivership or
     similar proceeding relating to that issuer or its property;

          (3) in an assignment for the benefit of creditors; or

          (4) in any marshalling of that issuer's assets and liabilities.

     Neither of the issuers may make any payment or distribution (whether by
redemption, purchase, defeasance or otherwise) in respect of the notes (except
in Permitted Junior Securities or from the trust described under "-- Legal
Defeasance and Covenant Defeasance") if:

          (1) a default in the payment of principal, premium or interest (and
     other Obligations in the case of the Credit Facilities) on Designated
     Senior Debt occurs and is continuing; or

          (2) any other default occurs and is continuing on Designated Senior
     Debt that permits holders of the Designated Senior Debt to accelerate its
     maturity and the Trustee receives a notice of such default (a "Payment
     Blockage Notice") from the Issuers or the holders of any Designated Senior
     Debt (or their representative).

     Payments on the notes may and shall be resumed:

          (1) in the case of a payment default, upon the date on which such
     default is cured or waived; and

          (2) in case of a nonpayment default, the earlier of the date on which
     such nonpayment default is cured or waived and 179 days after the date on
     which the applicable Payment Blockage Notice is received, unless the
     maturity of any Designated Senior Debt has been accelerated.

     No new Payment Blockage Notice may be delivered unless and until 360 days
have elapsed since the effectiveness of the immediately prior Payment Blockage
Notice.

     No nonpayment default that existed or was continuing on the date of
delivery of any Payment Blockage Notice to the Trustee shall be, or be made, the
basis for a subsequent Payment Blockage Notice unless such default shall have
been cured or waived for a period of not less than 120 days.

     If the Trustee or any holder receives payment that violates the above, such
payment shall be held in trust by the Trustee or such holder for the benefit of,
and upon written request shall be paid to, the holder of Designated Senior Debt.
Holders of the notes shall have subrogation rights.

     The issuers must promptly notify holders of Senior Debt if payment of the
notes is accelerated because of an Event of Default.


     As a result of the subordination provisions described above, in the event
of a bankruptcy, liquidation or reorganization of Leviathan or Leviathan
Finance, holders of these notes may recover less ratably than creditors of such
issuers who are holders of Senior Debt. See "Risk Factors -- Risks Related to
Our Financial Structure and the Notes" beginning on page 15.


THE GUARANTEES

     The Subsidiary Guarantors will jointly and severally guarantee the issuers'
obligations under these notes. Each Guarantee and the related obligations will
be subordinated to the prior payment in full of all Senior Debt of that
Subsidiary Guarantor. The obligations of each Subsidiary Guarantor under its
Guarantee will be limited as necessary to prevent that Guarantee from
constituting a fraudulent

                                       91
<PAGE>   96


conveyance under applicable law. See "Risk Factors -- Risks Related to Our
Financial Structure and the Notes" beginning on page 15.


     The Obligations of each Subsidiary Guarantor with respect to the notes
under its Guarantee will be subordinated to its Senior Debt on the same basis as
the notes are subordinated to Senior Debt.

     A Subsidiary Guarantor may not incur any Indebtedness which is subordinate
or junior in ranking in any respect to any of its Senior Debt unless such
Indebtedness is Senior Debt or is expressly subordinated in right of payment to
the Senior Debt of such Subsidiary Guarantor to at least the same extent as the
Guarantee of such Subsidiary Guarantor.

     A Subsidiary Guarantor may not consolidate with or merge with or into
(whether or not such Subsidiary Guarantor is the surviving Person), another
Person unless:

          (1) immediately after giving effect to that transaction, no Default or
     Event of Default exists; and

          (2) the Person (if not otherwise a Subsidiary Guarantor) formed by or
     surviving any such consolidation or merger assumes all the obligations of
     that Subsidiary Guarantor pursuant to a supplemental indenture satisfactory
     to the Trustee, except as provided in the next paragraph.

Leviathan or any Subsidiary Guarantor, however, may be merged or consolidated
with or into any one or more Subsidiary Guarantors or Leviathan.

     The Guarantee of a Subsidiary Guarantor will be released:

          (1) in connection with any sale or other disposition of all or
     substantially all of the assets of that Subsidiary Guarantor (including by
     way of merger or consolidation), if Leviathan applies the Net Proceeds of
     that sale or other disposition in accordance with the applicable provisions
     of the Indenture; or

          (2) in connection with any sale or other disposition of all of the
     Equity Interests of a Subsidiary Guarantor, if Leviathan applies the Net
     Proceeds of that sale in accordance with the applicable provisions of the
     Indenture applicable to Asset Sales; or

          (3) if Leviathan designates any Restricted Subsidiary that is a
     Subsidiary Guarantor as an Unrestricted Subsidiary; or

          (4) at such time as such Subsidiary Guarantor ceases to guarantee any
     other Indebtedness of Leviathan.


     See "Repurchase at the Option of Holders -- Asset Sales" beginning on page
95.


     Any Restricted Subsidiary that guarantees Indebtedness of either of the
issuers or any other Restricted Subsidiary at a time when it is not a Subsidiary
Guarantor shall execute a Guarantee.

OPTIONAL REDEMPTION

     Prior to June 1, 2002, the issuers may on any one or more occasions redeem
up to 33% of the aggregate principal amount of notes originally issued under the
Indenture at a redemption price of 110 3/8% of the principal amount thereof,
plus accrued and unpaid interest and Liquidated Damages, if any, to the
redemption date, with the net cash proceeds of one or more Equity Offerings.
However, at least 67% of the aggregate principal amount of notes must remain
outstanding immediately after the occurrence of such redemption (excluding notes
held by Leviathan, Leviathan Finance and its Restricted Subsidiaries). Any
redemption must occur within 90 days of the date of the closing of such Equity
Offering.

     Except pursuant to the preceding paragraph, the notes will not be
redeemable at the issuers' option prior to June 1, 2004.

     On or after June 1, 2004, the issuers may redeem all or a part of these
notes upon not less than 30 nor more than 60 days' notice, at the redemption
prices (expressed as percentages of principal amount) set
                                       92
<PAGE>   97

forth below plus accrued and unpaid interest thereon, if any, and Liquidated
Damages, if any, to the applicable redemption date, if redeemed during the
12-month period beginning on June 1st of the years indicated below:

<TABLE>
<CAPTION>
YEAR                                                        PERCENTAGE
- ----                                                        ----------
<S>                                                         <C>
2004.....................................................    105.188%
2005.....................................................    103.458%
2006.....................................................    101.729%
2007 and thereafter......................................    100.000%
</TABLE>

SELECTION AND NOTICE

     If less than all of the notes are to be redeemed at any time, the Trustee
will select notes for redemption as follows:

          (1) if the notes are listed, in compliance with the requirements of
     the principal national securities exchange on which the notes are listed;
     or

          (2) if the notes are not so listed or there are no such requirements,
     on a pro rata basis, by lot or by such method as the Trustee shall deem
     fair and appropriate.

     No notes of $1,000 or less shall be redeemed in part. Notices of redemption
shall be mailed by first class mail at least 30 but not more than 60 days before
the redemption date to each holder of notes to be redeemed at its registered
address. Notices of redemption may not be conditional.

     If any note is to be redeemed in part only, the notice of redemption that
relates to that note shall state the portion of the principal amount thereof to
be redeemed. A new note in principal amount equal to the unredeemed portion of
the original note will be issued in the name of the holder thereof upon
cancellation of the original note. Notes called for redemption become due on the
date fixed for redemption. On and after the redemption date, interest and
Liquidated Damages, if applicable, ceases to accrue on notes or portions of them
called for redemption unless the Issuers default in making such redemption
payment.

REPURCHASE AT THE OPTION OF HOLDERS

  Change of Control

     If a Change of Control occurs, each holder of notes will have the right to
require the issuers to repurchase all or any part (equal to $1,000 or an
integral multiple thereof) of that holder's notes pursuant to the Change of
Control Offer. In the Change of Control Offer, the issuers will offer a Change
of Control Payment in cash equal to 101% of the aggregate principal amount of
notes repurchased plus accrued and unpaid interest thereon, if any, and
Liquidated Damages, if any, to the date of purchase (the "Change of Control
Payment"). Within 30 days following any Change of Control, the issuers will mail
a notice to each holder describing the transaction or transactions that
constitute the Change of Control and offering to repurchase notes on the Change
of Control Payment Date specified in such notice, pursuant to the procedures
required by the Indenture and described in such notice. The issuers will comply
with the requirements of Rule 14e-1 under the Exchange Act and any other
securities laws and regulations thereunder to the extent such laws and
regulations are applicable in connection with the repurchase of the notes as a
result of a Change of Control.

     On the Change of Control Payment Date, the issuers will, to the extent
lawful;

          (1) accept for payment all notes or portions thereof properly tendered
     pursuant to the Change of Control Offer;

          (2) deposit with the Paying Agent an amount equal to the Change of
     Control Payment in respect of all notes or portions thereof so tendered;
     and

                                       93
<PAGE>   98

          (3) deliver or cause to be delivered to the Trustee the notes so
     accepted together with an Officers' Certificate stating the aggregate
     principal amount of notes or portions thereof being purchased by Leviathan.

     The Paying Agent will promptly mail to each holder of notes so tendered the
Change of Control Payment for such notes, and the Trustee will promptly
authenticate and mail (or cause to be transferred by book entry) to each holder
a new note equal in principal amount to any unpurchased portion of the notes
surrendered, if any; provided that each such new note will be in a principal
amount of $1,000 or an integral multiple thereof. The issuers will publicly
announce the results of the Change of Control Offer on or as soon as practicable
after the Change of Control Payment Date.

     Prior to complying with any of the provisions of this "Change of Control"
covenant, but in any event within 90 days following a Change of Control, the
issuers will either repay all outstanding Senior Debt or obtain the requisite
consents, if any, under all agreements governing outstanding Senior Debt to
permit the repurchase of notes required by this covenant.

     The provisions described above that require the issuers to make a Change of
Control Offer following a Change of Control will be applicable regardless of
whether or not any other provisions of the Indenture are applicable. Except as
described above with respect to a Change of Control, the Indenture does not
contain provisions that permit the holder of the notes to require that the
issuers repurchase or redeem the notes in the event of a takeover,
recapitalization or similar transaction.

     Leviathan's outstanding Senior Debt currently prohibits Leviathan from
purchasing any notes, and also provides that certain change of control events
with respect to Leviathan would constitute a default under the agreements
governing the Senior Debt. Any future credit agreements or other agreements
relating to Senior Debt to which Leviathan becomes a party may contain similar
restrictions and provisions. Moreover, the exercise by the holders of their
right to require the issuers to repurchase the notes could cause a default under
such Senior Debt, even if the Change of Control does not, due to the financial
effect of such a repurchase on Leviathan. If a Change of Control occurs at a
time when Leviathan is prohibited from purchasing notes, Leviathan could seek
the consent of its senior lenders to the purchase of notes or could attempt to
refinance the borrowings that contain such prohibition. If Leviathan does not
obtain such a consent or repay such borrowings, Leviathan will remain prohibited
from purchasing notes. In such case, Leviathan's failure to purchase tendered
notes would constitute an Event of Default under the Indenture which would, in
turn, in all likelihood constitute a default under such Senior Debt. In such
circumstances, the subordination provisions in the Indenture would likely
restrict payments to the holders of notes. Finally, the issuers' ability to pay
cash to the holders upon a repurchase may be limited by Leviathan's then
existing financial resources. We cannot assure you that sufficient funds will be
available when necessary to make any required repurchases.

     Notwithstanding the preceding paragraphs of this covenant, the issuers will
not be required to make a Change of Control Offer upon a Change of Control and a
holder will not have the right to require the issuers to repurchase any notes
pursuant to a Change of Control Offer if a third party makes an offer to
purchase the notes in the manner, at the times and otherwise in substantial
compliance with the requirements set forth in the Indenture applicable to a
Change of Control Offer and purchases all notes validly tendered and not
withdrawn under such purchase offer.

     The definition of Change of Control includes a phrase relating to the sale,
transfer, lease, conveyance or other disposition of "all or substantially all"
of the assets of Leviathan and its Subsidiaries taken as a whole. Although there
is a limited body of case law interpreting the phrase "substantially all," there
is no precise established definition of the phrase under applicable law.
Accordingly, the ability of a holder of notes to require Leviathan to repurchase
such notes as a result of a sale, transfer, lease, conveyance or other
disposition of less than all of the assets of Leviathan and its Restricted
Subsidiaries taken as a whole to another Person or group may be uncertain.

                                       94
<PAGE>   99

  Asset Sales

     The issuers will not, and will not permit any of Leviathan's Restricted
Subsidiaries to, consummate an Asset Sale unless:

          (1) Leviathan (or the Restricted Subsidiary, as the case may be)
     receives consideration at the time of such Asset Sale at least equal to the
     fair market value of the assets or Equity Interests issued or sold or
     otherwise disposed of;

          (2) such fair market value is determined by (a) an executive officer
     of Leviathan if the value is less than $5.0 million, as evidence by an
     Officers' Certificate delivered to the Trustee or (b) the Board of
     Directors of the General Partner if the value is $5.0 million or more, as
     evidenced by a resolution of such Board of Directors of the General
     Partner; and

          (3) at least 75% of the consideration therefor received by Leviathan
     or such Restricted Subsidiary is in the form of cash or Cash Equivalents.
     For purposes of this provision, each of the following shall be deemed to be
     cash:

             (a) any liabilities (as shown on the issuer's or such Restricted
        Subsidiary's most recent balance sheet) of Leviathan or any Restricted
        Subsidiary (other than contingent liabilities and liabilities that are
        by their terms subordinated to the notes or any Guarantee) that are
        assumed by the transferee of any such assets pursuant to a customary
        novation agreement that releases Leviathan or such Restricted Subsidiary
        from further liability; and

             (b) any securities, notes or other obligations received by
        Leviathan or any such Restricted Subsidiary from such transferee that
        are within 90 days after the Asset Sale (subject to ordinary settlement
        periods) converted by such issuer or such Restricted Subsidiary into
        cash (to the extent of the cash received in that conversion).

     Within 360 days after the receipt of any Net Proceeds from an Asset Sale,
Leviathan or a Restricted Subsidiary may apply (or enter into a definitive
agreement for such application within such 360-day period, provided that such
capital expenditure or purchase is closed within 90 days after the end of such
360-day period) such Net Proceeds at its option:

          (1) to repay Senior Debt of Leviathan and/or its Restricted
     Subsidiaries (or to make an offer to repurchase or redeem Senior Debt,
     provided that such repurchase or redemption closes within 45 days after the
     end of such 360-day period) with a permanent reduction in availability for
     any revolving credit Indebtedness;

          (2) to make a capital expenditure in a Permitted Business;

          (3) to acquire other long-term tangible assets that are used or useful
     in a Permitted Business; or

          (4) to invest in any other Permitted Business Investment or any other
     Permitted Investments other than Investments in Cash Equivalents, Interest
     Swaps or Currency Agreements.

Pending the final application of any such Net Proceeds, we may temporarily
reduce revolving credit borrowings or otherwise invest such Net Proceeds in any
manner that is not prohibited by the Indenture.

     Any Net Proceeds from Asset Sales that are not applied or invested as
provided in the preceding paragraph will constitute Excess Proceeds. When the
aggregate amount of Excess Proceeds exceeds $10.0 million, the issuers will make
a pro rata offer (an "Asset Sale Offer") to all holders of notes and all holders
of other Indebtedness that is pari passu with the notes containing provisions
similar to those set forth in the Indenture with respect to offers to purchase
or redeem with the proceeds of sales of assets to purchase the maximum principal
amount of notes and such other pari passu Indebtedness that may be purchased out
of the Excess Proceeds. The offer price in any Asset Sale Offer will be equal to
100% of principal amount plus accrued and unpaid interest (including any
Liquidated Damages in the case of the notes), if any, and premium, if any, to
the date of purchase, and will be payable in cash. If any Excess

                                       95
<PAGE>   100

Proceeds remain after consummation of an Asset Sale Offer, Leviathan may use
such Excess Proceeds for any purpose not otherwise prohibited by the Indenture,
including, without limitation, the repurchase or redemption of Indebtedness of
the issuers or any Subsidiary Guarantor that is subordinated to the notes or, in
the case of any Subsidiary Guarantor, the Guarantee of such Subsidiary
Guarantor. If the aggregate principal amount of notes tendered into such Asset
Sale Offer exceeds the amount of Excess Proceeds allocated for repurchases of
notes pursuant to the Asset Sale Offer for notes, the Trustee shall select the
notes to be purchased on a pro rata basis. Upon completion of each Asset Sale
Offer, the amount of Excess Proceeds shall be reset at zero.

     The term Asset Sale excludes:

          (1) any transaction whereby assets or properties (including (a)
     ownership interests in any Subsidiary or Joint Venture and (b) in the case
     of an exchange or contribution for tangible assets, up to 25% in the form
     of cash, Cash Equivalents, accounts receivable or other current assets),
     owned by Leviathan or a Restricted Subsidiary are exchanged or contributed
     for the Equity Interests of a Joint Venture or Unrestricted Subsidiary in a
     transaction that satisfies the requirements of a Permitted Business
     Investment or for other assets (not more than 25% of which consists of
     cash, Cash Equivalents, accounts receivables or other current assets) or
     properties (including interests in any Subsidiary or Joint Venture) so long
     as (i) the fair market value of the assets or properties (if other than a
     Permitted Business Investment) received are substantially equivalent to the
     fair market value of the assets or properties given up, and (ii) any cash
     received in such exchange or contribution by Leviathan or any Restricted
     Subsidiary is applied in accordance with the foregoing "-- Asset Sales"
     provision;

          (2) any sale, transfer or other disposition of cash or Cash
     Equivalents;

          (3) any sale, transfer or other disposition of Restricted Investments;
     and

          (4) any sale, transfer or other disposition of interests in oil and
     gas leaseholds (including, without limitation, by abandonment, farm-ins,
     farm-outs, leases, swaps and subleases), hydrocarbons and other mineral
     products in the ordinary course of business of the oil and gas operations
     conducted by Leviathan or any Restricted Subsidiary, which sale, transfer
     or other disposition is made by Leviathan or any Restricted Subsidiary.

CERTAIN COVENANTS

  Restricted Payments

     The issuers will not, and will not permit any of their Restricted
Subsidiaries to, directly or indirectly:

          (1) declare or pay any dividend or make any other payment or
     distribution on account of Leviathan's or any of its Restricted
     Subsidiaries' Equity Interests (including, without limitation, any payment
     in connection with any merger or consolidation involving Leviathan or any
     of its Restricted Subsidiaries) or to the direct or indirect holders of
     Leviathan's or any of its Restricted Subsidiaries' Equity Interests in
     their capacity as such (other than distributions or dividends payable in
     Equity Interests of Leviathan (other than Disqualified Equity) and other
     than distributions or dividends payable to Leviathan or a Restricted
     Subsidiary);

          (2) except to the extent permitted in clause 4 below, purchase, redeem
     or otherwise acquire or retire for value (including, without limitation, in
     connection with any merger or consolidation involving an Issuer) any Equity
     Interests of Leviathan or any of its Restricted Subsidiaries (other than
     any such Equity Interests owned by Leviathan or any of its Restricted
     Subsidiaries);

          (3) except to the extent permitted in clause 4 below, make any payment
     on or with respect to, or purchase, redeem, defease or otherwise acquire or
     retire for value any Indebtedness that is pari passu with or subordinated
     to the notes or the Guarantees (other than the notes or the Guarantees),
     except (a) a payment of interest or principal at the Stated Maturity
     thereof, (b) a purchase, redemption, acquisition or retirement required to
     be made pursuant to the terms of such Indebtedness

                                       96
<PAGE>   101

     (including pursuant to an asset sale or change of control provision) and
     (c) any such Indebtedness of Leviathan or a Restricted Subsidiary owned by
     Leviathan or a Restricted Subsidiary; or

          (4) make any Investment other than a Permitted Investment or a
     Permitted Business Investment (all such payments and other actions set
     forth in clauses (1) through (4) above being collectively referred to as
     "Restricted Payments"),

unless, at the time of and after giving effect to such Restricted Payment, no
Default or Event of Default shall have occurred and be continuing or would occur
as a consequence thereof and either:

          (1) if the Fixed Charge Coverage Ratio for Leviathan's four most
     recent fiscal quarters for which internal financial statements are
     available is not less than 1.75 to 1.0 through March 31, 2001, and 2.0 to
     1.0 thereafter, such Restricted Payment, together with the aggregate amount
     of all other Restricted Payments made by Leviathan and its Restricted
     Subsidiaries during the quarter in which such Restricted Payment is made,
     is less than the sum, without duplication, of (a) Available Cash
     constituting Cash from Operations as of the end of the immediately
     preceding quarter, (b) the aggregate net cash proceeds of any (i)
     substantially concurrent capital contribution to Leviathan from any Person
     (other than a Restricted Subsidiary of Leviathan) made after the Issue
     Date, (ii) substantially concurrent issuance and sale made after the Issue
     Date of Equity Interests (other than Disqualified Equity) of Leviathan or
     from the issuance or sale made after the Issue Date of convertible or
     exchangeable Disqualified Equity or convertible or exchangeable debt
     securities of Leviathan that have been converted into or exchanged for such
     Equity Interests, (iii) to the extent that any Restricted Investment that
     was made after the Issue Date is sold for cash or Cash Equivalents or
     otherwise liquidated or repaid for cash or Cash Equivalents, the lesser of
     the refund of capital or similar payment made in cash or Cash Equivalents
     with respect to such Restricted Investment (less the cost of such
     disposition, if any) and the initial amount of such Restricted Investment
     (other than to a Restricted Subsidiary of Leviathan), and (c) the net
     reduction in Investments in Restricted Investments resulting from
     dividends, repayments of loans or advances, or other transfers of assets in
     each case to Leviathan or any of its Restricted Subsidiaries from any
     Person (including, without limitation, Unrestricted Subsidiaries) or from
     redesignations of Unrestricted Subsidiaries as Restricted Subsidiaries, to
     the extent such amounts have not been included in Available Cash
     constituting Cash from Operations for any period commencing on or after the
     Issue Date (items (b) and (c) being referred to as "Incremental Funds"),
     less (d) the aggregate amount of Incremental Funds previously expended
     pursuant to this clause (1) or clause (2) below; or

          (2) if the Fixed Charge Coverage Ratio for Leviathan's four most
     recent fiscal quarters for which internal financial statements are
     available is less than 1.75 to 1.0 through March 31, 2001, and 2.0 to 1.0
     thereafter, such Restricted Payment, together with the aggregate amount of
     all other Restricted Payments made by Leviathan and its Restricted
     Subsidiaries during the quarter in which such Restricted Payment is made,
     is less than the sum, without duplication, of (a) $40.0 million less the
     aggregate amount of all Restricted Payments made by Leviathan and its
     Restricted Subsidiaries pursuant to this clause (2)(a) during the period
     ending on the last day of the fiscal quarter of Leviathan immediately
     preceding the date of such Restricted Payment and beginning on the Issue
     Date, plus (b) Incremental Funds to the extent not previously expended
     pursuant to this clause (2) or clause (1) above.

For purposes of clauses (1) and (2) above, the term "substantially concurrent"
means that either (x) the offering was consummated within 120 days of the date
of determination or (y) the offering was consummated within 24 months of the
date of determination and the proceeds therefrom were used for the purposes
expressly stated in the documents related thereto and may be traced to such use
by segregating, separating or otherwise specifically identifying the movement of
such proceeds.

                                       97
<PAGE>   102

     So long as no Default has occurred and is continuing or would be caused
thereby, the preceding provisions will not prohibit:

          (1) the payment by Leviathan or any Restricted Subsidiary of any
     distribution or dividend within 60 days after the date of declaration
     thereof, if at said date of declaration such payment would have complied
     with the provisions of the Indenture;

          (2) the redemption, repurchase, retirement, defeasance or other
     acquisition of any pari passu or subordinated Indebtedness of Leviathan or
     any of its Restricted Subsidiaries or of any Equity Interests of Leviathan
     or any of its Restricted Subsidiaries in exchange for, or out of the net
     cash proceeds of, a substantially concurrent (a) capital contribution to
     Leviathan or such Restricted Subsidiary from any Person (other than
     Leviathan or another Restricted Subsidiary) or (b) sale (a sale will be
     deemed substantially concurrent if such redemption, repurchase, retirement,
     defeasance or acquisition occurs not more than 120 days after such sale)
     (other than to a Restricted Subsidiary of Leviathan) of (i) Equity
     Interests (other than Disqualified Equity) of Leviathan or such Restricted
     Subsidiary or (ii) Indebtedness that is subordinated to the notes or the
     Guarantees, provided that such new subordinated Indebtedness with respect
     to the redemption, repurchase, retirement, defeasance or other acquisition
     of pari passu or subordinated Indebtedness (W) is subordinated to the same
     extent as such refinanced subordinated Indebtedness, (X) has a Weighted
     Average Life to Maturity of at least the remaining Weighted Average Life to
     Maturity of the refinanced subordinated Indebtedness, (Y) is for the same
     principal amount as either such refinanced subordinated Indebtedness plus
     original issue discount to the extent not reflected therein or the
     redemption or purchase price of such Equity Interests (plus reasonable
     expenses of refinancing and any premiums paid on such refinanced
     subordinated Indebtedness) and (Z) is incurred by Leviathan or the
     Restricted Subsidiary that is the obligor on the Indebtedness so refinanced
     or the issuer of the Equity Interests so redeemed, repurchased or retired;
     provided, however, that the amount of any net cash proceeds that are
     utilized for any such redemption, repurchase or other acquisition or
     retirement shall be excluded or deducted from the calculation of Available
     Cash and Incremental Funds;

          (3) the defeasance, redemption, repurchase or other acquisition of
     pari passu or subordinated Indebtedness of Leviathan or any Restricted
     Subsidiary with the net cash proceeds from an incurrence of Permitted
     Refinancing Indebtedness;

          (4) the payment of any distribution or dividend by a Restricted
     Subsidiary to Leviathan or to the holders of its Equity Interests (other
     than Disqualified Equity) on a pro rata basis;

          (5) the repurchase, redemption or other acquisition or retirement for
     value of any Equity Interests of Leviathan or any Restricted Subsidiary of
     Leviathan held by any member of the General Partner's or Leviathan's or any
     Restricted Subsidiary's management pursuant to any management equity
     subscription agreement or stock option agreement or to satisfy obligations
     under any Equity Interests appreciation rights or option plan or similar
     arrangement; provided that the aggregate price paid for all such
     repurchased, redeemed, acquired or retired Equity Interests shall not
     exceed $2.0 million in any 12-month period;

          (6) the acquisition on or before December 31, 2000 of preference units
     of Leviathan outstanding on the date of issuance of the original notes
     under the Indenture, provided that the aggregate amount paid to acquire
     preference units shall not exceed $2.0 million; and

          (7) any payment by Leviathan pursuant to section 3.1(b) of the
     Management Agreement to compensate for certain tax liabilities resulting
     from certain allocated income.

In computing the amount of Restricted Payments previously made for purposes of
the immediately preceding paragraph, Restricted Payments made under clauses (1)
(but only if the declaration of such dividend or other distribution has not been
counted in a prior period) and, to the extent of amounts paid to holders other
than Leviathan or a Restricted Subsidiary, (4) shall be included, and Restricted
Payments made under clauses (2), (3), (5), (6) and (7) and, except to the extent
noted above, (4) shall not be

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included. The amount of all Restricted Payments (other than cash) shall be the
fair market value on the date of the Restricted Payment of the asset(s) or
securities proposed to be transferred or issued by Leviathan or such Restricted
Subsidiary, as the case may be, pursuant to the Restricted Payment. The fair
market value of any assets or securities that are required to be valued by this
covenant shall be determined by the Board of Directors of the General Partner
whose resolution with respect thereto shall be delivered to the Trustee.

  Incurrence of Indebtedness and Issuance of Disqualified Equity

     Leviathan will not, and will not permit any of its Restricted Subsidiaries
to, directly or indirectly, create, incur, issue, assume, guarantee or otherwise
become directly or indirectly liable, contingently or otherwise, with respect to
(collectively, "incur") any Indebtedness (including Acquired Debt), and
Leviathan will not issue any Disqualified Equity and will not permit any of its
Restricted Subsidiaries to issue any Disqualified Equity; provided, however,
that Leviathan and any Restricted Subsidiary may incur Indebtedness (including
Acquired Debt), and Leviathan and the Restricted Subsidiaries may issue
Disqualified Equity, if the Fixed Charge Coverage Ratio for Leviathan's most
recently ended four full fiscal quarters for which internal financial statements
are available immediately preceding the date on which such additional
Indebtedness is incurred or such Disqualified Equity is issued would have been
at least 2.0 to 1.0 through March 31, 2001, and 2.25 to 1.0 thereafter,
determined on a pro forma basis (including a pro forma application of the net
proceeds therefrom), as if the additional Indebtedness had been incurred, or the
Disqualified Equity had been issued, as the case may be, at the beginning of
such four-quarter period.

     So long as no Default shall have occurred and be continuing or would be
caused thereby, the first paragraph of this covenant will not prohibit the
incurrence of any of the following items of Indebtedness (collectively,
"Permitted Debt"):

          (1) the incurrence by Leviathan and any Restricted Subsidiary of the
     Indebtedness under Credit Facilities and the guarantees thereof; provided
     that the aggregate principal amount of all Indebtedness of Leviathan and
     the Restricted Subsidiaries outstanding under all Credit Facilities after
     giving effect to such incurrence does not exceed $375.0 million less the
     aggregate amount of all repayments of Indebtedness under a Credit Facility
     that have been made by Leviathan or any of its Restricted Subsidiaries in
     respect of Asset Sales to the extent such repayments constitute a permanent
     reduction of commitments under such Credit Facility;

          (2) the incurrence by Leviathan and its Restricted Subsidiaries of
     Existing Indebtedness;

          (3) the incurrence by Leviathan and the Subsidiary Guarantors of
     Indebtedness represented by the notes and the Guarantees and the related
     Obligations;

          (4) the incurrence by Leviathan or any of its Restricted Subsidiaries
     of Indebtedness represented by Capital Lease Obligations, mortgage
     financings or purchase money obligations, in each case, incurred for the
     purpose of financing all or any part of the purchase price or cost of
     construction or improvement of property, plant or equipment used in the
     business of Leviathan or such Restricted Subsidiary, in an aggregate
     principal amount not to exceed $10.0 million at any time outstanding;

          (5) the incurrence by Leviathan or any of its Restricted Subsidiaries
     of Permitted Refinancing Indebtedness in exchange for, or the net proceeds
     of which are used to refund, refinance or replace, Indebtedness (other than
     intercompany Indebtedness) that was not incurred in violation of the
     Indenture;

          (6) the incurrence by Leviathan or any of its Restricted Subsidiaries
     of intercompany Indebtedness between or among Leviathan and any of its
     Restricted Subsidiaries; provided, however, that:

             (a) if Leviathan or any Subsidiary Guarantor is the obligor on such
        Indebtedness, such Indebtedness must be expressly subordinated to the
        prior payment in full in cash of all

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        Obligations with respect to the notes, in the case of Leviathan, or the
        Guarantee of such Subsidiary Guarantor, in the case of a Subsidiary
        Guarantor, and

             (b) (i) any subsequent issuance or transfer of Equity Interests
        that results in any such Indebtedness being held by a Person other than
        Leviathan or a Restricted Subsidiary thereof and (ii) any sale or other
        transfer of any such Indebtedness to a Person that is not either
        Leviathan or a Restricted Subsidiary thereof, shall be deemed, in each
        case, to constitute an incurrence of such Indebtedness by Leviathan or
        such Restricted Subsidiary, as the case may be, that was not permitted
        by this clause (6);

          (7) the incurrence by Leviathan or any of its Restricted Subsidiaries
     of Hedging Obligations that are incurred for the purpose of fixing or
     hedging foreign currency exchange rate risk of Leviathan or any Restricted
     Subsidiary or interest rate risk with respect to any floating rate
     Indebtedness of Leviathan or any Restricted Subsidiary that is permitted by
     the terms of this Indenture to be outstanding or commodities pricing risks
     of Leviathan or any Restricted Subsidiary in respect of hydrocarbon
     production from properties in which Leviathan or any of its Restricted
     Subsidiaries owns an interest;

          (8) the guarantee by Leviathan or any of the Restricted Subsidiaries
     of Indebtedness of Leviathan or a Restricted Subsidiary that was permitted
     to be incurred by another provision of this covenant;

          (9) bid, performance, surety and appeal bonds in the ordinary course
     of business, including guarantees and standby letters of credit supporting
     such obligations, to the extent not drawn;

          (10) the incurrence by Leviathan or any of its Restricted Subsidiaries
     of additional Indebtedness in an aggregate principal amount (or accreted
     value, as applicable) at any time outstanding, including all Permitted
     Refinancing Indebtedness incurred to refund, refinance or replace any
     Indebtedness incurred pursuant to this clause (10), not to exceed $10.0
     million;

          (11) the incurrence by Leviathan's Unrestricted Subsidiaries of
     Non-Recourse Debt; provided, however, that if any such Indebtedness ceases
     to be Non-Recourse Debt of an Unrestricted Subsidiary, such event shall be
     deemed to constitute an incurrence of Indebtedness by a Restricted
     Subsidiary of Leviathan that was not permitted by this clause (11);

          (12) the payment of interest on any Indebtedness in the form of
     additional Indebtedness with the same terms, and the payment of dividends
     on Disqualified Equity, in the form of additional shares of the same class
     of Disqualified Equity, provided, in each such case, that the amount
     thereof is included in Fixed Charges of Leviathan as so accrued, accredited
     or amortized; and

          (13) Indebtedness incurred by Leviathan or any of its Restricted
     Subsidiaries arising from agreements or their respective bylaws providing
     for indemnification, adjustment of purchase price or similar obligations.

     For purposes of determining compliance with this "-- Incurrence of
Indebtedness and Issuance of Disqualified Equity" covenant, in the event that an
item of proposed Indebtedness meets the criteria of more than one of the
categories of Permitted Debt described in clauses (1) through (12) above, or is
entitled to be incurred pursuant to the first paragraph of this covenant,
Leviathan will be permitted to classify such item of Indebtedness in any manner
that complies with this covenant. An item of Indebtedness may be divided and
classified in one or more of the types of Permitted Indebtedness.

  Limitation on Layering

     Leviathan will not incur, create, issue, assume, guarantee or otherwise
become liable for any Indebtedness that is subordinate or junior in right of
payment to any Senior Debt of Leviathan and senior in any respect in right of
payment to the notes. No Subsidiary Guarantor will incur, create, issue, assume,
guarantee or otherwise become liable for any Indebtedness that is subordinate or
junior in right of payment

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to any Senior Debt of such Subsidiary Guarantor and senior in any respect in
right of payment to such Subsidiary Guarantor's Guarantee.

  Liens

     Leviathan will not, and will not permit any of its Restricted Subsidiaries
to, directly or indirectly, create, incur, assume or suffer to exist any Lien of
any kind securing Indebtedness, Attributable Debt or trade payables on any asset
now owned or hereafter acquired, except Permitted Liens, without making
effective provision whereby all Obligations due under the notes and Indenture or
any Guarantee, as applicable, will be secured by a Lien equally and ratably with
any and all Obligations thereby secured for so long as any such Obligations
shall be so secured.

  Dividend and Other Payment Restrictions Affecting Subsidiaries

     Leviathan will not, and will not permit any of its Restricted Subsidiaries
to, directly or indirectly, create or permit to exist or become effective any
encumbrance or restriction on the ability of any Restricted Subsidiary to:

          (1) pay dividends or make any other distributions on its Equity
     Interests to Leviathan or any of Leviathan's Restricted Subsidiaries, or
     with respect to any other interest or participation in, or measured by, its
     profits, or pay any indebtedness owed to Leviathan or any of the other
     Restricted Subsidiaries;

          (2) make loans or advances to or make other investments in Leviathan
     or any of the other Restricted Subsidiaries; or

          (3) transfer any of its properties or assets to Leviathan or any of
     the other Restricted Subsidiaries.

     However, the preceding restrictions will not apply to encumbrances or
restrictions existing under or by reason of:

          (1) agreements as in effect on the Issue Date and any amendments,
     modifications, restatements, renewals, increases, supplements, refundings,
     replacements or refinancings of any such agreements or any Existing
     Indebtedness to which such agreement relates, provided that such
     amendments, modifications, restatements, renewals, increases, supplements,
     refundings, replacements or refinancings are no more restrictive, taken as
     a whole, with respect to such distribution, dividend and other payment
     restrictions and loan or investment restrictions than those contained in
     such agreement, as in effect on the date of the Indenture;

          (2) the Leviathan Credit Facility and any amendments, modifications,
     restatements, renewals, increases, supplements, refundings, replacements or
     refinancings thereof, provided that such amendments, modifications,
     restatements, renewals, increases, supplements, refundings, replacements or
     refinancings are no more restrictive, taken as a whole, with respect to
     such distribution, dividend and other payment restrictions and loan or
     investment restrictions than those contained in such Credit Facility as in
     effect on the date of the Indenture;

          (3) the Indenture, the notes and the Guarantees;

          (4) applicable law;

          (5) any instrument governing Indebtedness or Equity Interests of a
     Person acquired by Leviathan or any of its Restricted Subsidiaries as in
     effect at the time of such acquisition (except to the extent such
     Indebtedness was incurred in connection with or in contemplation of such
     acquisition), which encumbrance or restriction is not applicable to any
     Person, or the properties or assets of any Person, other than such Person,
     or the property or assets of such Person, so acquired, provided that, in
     the case of Indebtedness, such Indebtedness was permitted by the terms of
     the Indenture to be incurred;
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          (6) customary non-assignment provisions in licenses and leases entered
     into in the ordinary course of business and consistent with past practices;

          (7) purchase money obligations for property acquired in the ordinary
     course of business that impose restrictions on the property so acquired of
     the nature described in clause (3) of the preceding paragraph;

          (8) any agreement for the sale or other disposition of a Restricted
     Subsidiary that contains any one or more of the restrictions described in
     clauses 1 through 3 of the preceding paragraph by such Restricted
     Subsidiary pending its sale or other disposition, provided that such sale
     or disposition is consummated, or such restrictions are canceled or
     terminated or lapse, within 90 days;

          (9) Permitted Refinancing Indebtedness, provided that the restrictions
     contained in the agreements governing such Permitted Refinancing
     Indebtedness are no more restrictive, taken as a whole, than those
     contained in the agreements governing the Indebtedness being refinanced;

          (10) Liens securing Indebtedness otherwise permitted to be issued
     pursuant to the provisions of the covenant described above under the
     caption "-- Liens" that limit the right of Leviathan or any of its
     Restricted Subsidiaries to dispose of the assets subject to such Lien;

          (11) any agreement or instrument relating to any property or assets
     acquired after the Issue Date, so long as such encumbrance or restriction
     relates only to the property or assets so acquired and is not and was not
     created in anticipation of such acquisitions;

          (12) any agreement or instrument relating to any Acquired Debt of any
     Restricted Subsidiary at the date on which such Restricted Subsidiary was
     acquired by Leviathan or any Restricted Subsidiary (other than Indebtedness
     incurred in anticipation of such acquisition and provided such encumbrances
     or restrictions extend only to property of such acquired Restricted
     Subsidiary);

          (13) any agreement or instrument governing Indebtedness permitted to
     be incurred under the Indenture, provided that the terms and conditions of
     any such restrictions and encumbrances, taken as a whole, are not
     materially more restrictive than those contained in the Indenture, taken as
     a whole;

          (14) provisions with respect to the disposition or distribution of
     assets or property in joint venture agreements and other similar
     agreements, including clawback agreements, to maintain financial
     performance or results of operations of a joint venture entered into in the
     ordinary course of business; and

          (15) restrictions on cash or other deposits or net worth imposed by
     customers under contracts entered into in the ordinary course of business.

  Merger, Consolidation, or Sale of Assets

     Neither of the issuers may, directly or indirectly: (1) consolidate or
merge with or into another Person (whether or not such issuer is the survivor);
or (2) sell, assign, transfer, lease, convey or otherwise dispose of all or
substantially all of its properties or assets, in one or more related
transactions, to another Person; unless:

          (1) either: (a) such issuer is the surviving entity of such
     transaction; or (b) the Person formed by or surviving any such
     consolidation or merger (if other than such issuer) or to which such sale,
     assignment, transfer, lease, conveyance or other disposition shall have
     been made is an entity organized or existing under the laws of the United
     States, any state thereof or the District of Columbia, provided that
     Leviathan Finance may not consolidate or merge with or into any entity
     other than a corporation satisfying such requirement for so long as
     Leviathan remains a partnership;

          (2) the Person formed by or surviving any such consolidation or merger
     (if other than such issuer) or the Person to which such sale, assignment,
     transfer, lease, conveyance or other disposition shall have been made
     assumes all the obligations of such issuer under the notes and the
     Indenture pursuant to agreements reasonably satisfactory to the Trustee;
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          (3) immediately after such transaction no Default or Event of Default
     exists;

          (4) such issuer or the Person formed by or surviving any such
     consolidation or merger (if other than such issuer):

             (a) will have Consolidated Net Worth immediately after the
        transaction equal to or greater than the Consolidated Net Worth of such
        issuer immediately preceding the transaction; and

             (b) will, on the date of such transaction after giving pro forma
        effect thereto and any related financing transactions as if the same had
        occurred at the beginning of the applicable four-quarter period, be
        permitted to Incur at least $1.00 of additional Indebtedness pursuant to
        the Fixed Charge Coverage Ratio test set forth in the first paragraph of
        the covenant described above under the caption "Incurrence of
        Indebtedness and Issuance of Disqualified Equity;"

          (5) such issuer has delivered to the Trustee an Officers' Certificate
     and an Opinion of Counsel, each stating that such consolidation, merger or
     transfer and, if a supplemental indenture is required, such supplemental
     indenture comply with the Indenture and all conditions precedent therein
     relating to such transaction have been satisfied.

     Notwithstanding the foregoing paragraph, Leviathan is permitted to
reorganize as any other form of entity in accordance with the procedures
established in the Indenture; provided that

          (1) the reorganization involves the conversion (by merger, sale,
     contribution or exchange of assets or otherwise) of Leviathan into a form
     of entity other than a limited partnership formed under Delaware law;

          (2) the entity so formed by or resulting from such reorganization is
     an entity organized or existing under the laws of the United States, any
     state thereof or the District of Columbia;

          (3) the entity so formed by or resulting from such reorganization
     assumes all the obligations of Leviathan under the notes and the Indenture
     pursuant to agreements reasonably satisfactory to the Trustee;

          (4) immediately after such reorganization no Default or Event of
     Default exists; and

          (5) such reorganization is not adverse to the holders of the notes
     (for purposes of this clause (5) it is stipulated that such reorganization
     shall not be considered adverse to the holders of the notes solely because
     the successor or survivor of such reorganization (i) is subject to federal
     or state income taxation as an entity or (ii) is considered to be an
     "includible corporation" of an affiliated group of corporations within the
     meaning of Section 1504(b)(i) of the Code or any similar state or local
     law).

     The "Merger, Consolidation, or Sale of Assets" covenant described in the
first paragraph of this section will not apply to a merger or consolidation, or
any sale, assignment, transfer, lease, conveyance or other disposition of assets
between or among Leviathan and any of its Restricted Subsidiaries.

     No Subsidiary Guarantor may consolidate with or merge with or into (whether
or not such Subsidiary Guarantor is the surviving Person) another Person,
whether or not affiliated with such Subsidiary Guarantor, but excluding
Leviathan or another Subsidiary Guarantor, unless (i) subject to the provisions
of the following paragraph, the Person formed by or surviving any such
consolidation or merger (if other than such Subsidiary Guarantor) assumes all
the obligations of such Subsidiary Guarantor pursuant to the Subsidiary
Guarantor's Guarantee of the notes and the Indenture pursuant to a supplemental
indenture and (ii) immediately after giving effect to such transaction, no
Default or Event of Default exists. Any Subsidiary Guarantor may be merged or
consolidated with or into any one or more Subsidiary Guarantors.

     In the event of a sale or other disposition of all or substantially all of
the assets of any Subsidiary Guarantor, by way of merger, consolidation or
otherwise, or a sale or other disposition of all or substantially all of the
Equity Interests of any Subsidiary Guarantor, then such Subsidiary Guarantor (in
the event of a sale or other disposition, by way of such a merger, consolidation
or otherwise, of all of the Equity Interests of such Subsidiary Guarantor) or
the Person acquiring the property (in the event of a sale

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or other disposition of all or substantially all of the assets of such
Subsidiary Guarantor) will be released and relieved of any obligations under its
Guarantee; provided that the transaction complies with the provisions set forth
under "Asset Sales."

  Transactions with Affiliates

     Leviathan will not, and will not permit any of its Restricted Subsidiaries
to, make any payment to, or sell, lease, transfer or otherwise dispose of any of
its properties or assets to, or purchase any property or assets from, or enter
into or make or amend any transaction, contract, agreement, understanding, loan,
advance or guarantee with, or for the benefit of, any Affiliate (each, an
"Affiliate Transaction"), unless:

          (1) such Affiliate Transaction is on terms that are no less favorable
     to Leviathan or the relevant Restricted Subsidiary than those that would
     have been obtained in a comparable transaction by Leviathan or such
     Restricted Subsidiary with an unrelated Person; and

          (2) Leviathan delivers to the Trustee:

             (a) with respect to any Affiliate Transaction or series of related
        Affiliate Transactions involving aggregate consideration in excess of
        $10.0 million, a resolution of the Board of Directors of the General
        Partner set forth in the Officers' Certificate certifying that such
        Affiliate Transaction complies with this covenant and that such
        Affiliate Transaction has been approved by a majority of the
        disinterested members of the Board of Directors of the General Partner;
        and

             (b) with respect to any Affiliate Transaction or series of related
        Affiliate Transactions involving aggregate consideration in excess of
        $25.0 million, either (I) an opinion as to the fairness to Leviathan of
        such Affiliate Transaction from a financial point of view issued by an
        accounting, appraisal or investment banking firm of national standing
        recognized as an expert in rendering fairness opinions on transactions
        such as those proposed, (II) with respect to assets classified, in
        accordance with GAAP, as property, plant and equipment on Leviathan's or
        such Restricted Subsidiary's balance sheet, a written appraisal from a
        nationally recognized appraiser showing the assets have a fair market
        value not less than the consideration to be paid (provided that if the
        fair market value determined by such appraiser is a range of values or
        otherwise inexact, the Board of Directors of the General Partner shall
        determine the exact fair market value, provided that it shall be within
        the range so determined by the appraiser), (III) in the case of
        gathering, transportation, marketing, hedging, production handling,
        operating, construction, storage, platform use, or other operational
        contracts, any such contracts are entered into in the ordinary course of
        business on terms substantially similar to those contained in similar
        contracts entered into by Leviathan or any Restricted Subsidiary and
        third parties or, if none of Leviathan or any Restricted Subsidiary has
        entered into a similar contract with a third party, that the terms are
        no less favorable than those available from third parties on an
        arm's-length basis, as determined by the Board of Directors of the
        General Partner or (IV) in the case of any transaction between Leviathan
        or any of its Restricted Subsidiaries and any Affiliate thereof in which
        Leviathan beneficially owns 50% or less of the Voting Stock and one or
        more Persons not Affiliated with Leviathan beneficially own (together) a
        percentage of Voting Stock at least equal to the interest in Voting
        Stock of such Affiliate beneficially owned by Leviathan, a resolution of
        the Board of Directors of the General Partner set forth in the Officers'
        Certificate certifying that such Affiliate Transaction complies with
        this covenant and that such Affiliate Transaction has been approved by a
        majority of the disinterested members of the Board of Directors of the
        General Partner. Even though a particular Affiliate Transaction or
        series of Affiliate Transactions may be covered by two or more of
        clauses (I) through (IV) above, the compliance with any one of such
        applicable clauses shall be satisfactory.

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     The following items shall not be deemed to be Affiliate Transactions and,
therefore, will not be subject to the provisions of the prior paragraph:

          (1) transactions pursuant to the Management Agreement as in effect on
     the date hereof,

          (2) any employment, equity option or equity appreciation agreement or
     plan entered into by Leviathan or any of its Restricted Subsidiaries in the
     ordinary course of business and, as applicable, consistent with the past
     practice of Leviathan or such Restricted Subsidiary;

          (3) transactions between or among Leviathan and/or its Restricted
     Subsidiaries;

          (4) Restricted Payments that are permitted by the provisions of the
     Indenture described above under the caption "-- Restricted Payments;"

          (5) transactions effected in accordance with the terms of agreements
     as in effect on the closing date of the issuance of the notes;

          (6) customary compensation, indemnification and other benefits made
     available to officers, directors or employees of Leviathan or a Restricted
     Subsidiary, including reimbursement or advancement of out-of-pocket
     expenses and provisions of officers' and directors' liability insurance;
     and

          (7) loans to officers and employees made in the ordinary course of
     business in an aggregate amount not to exceed $1.0 million at any one time
     outstanding.

  Additional Subsidiary Guarantees

     If Leviathan or any of its Restricted Subsidiaries acquires or creates
another Restricted Subsidiary after the date of the Indenture that guarantees
any Indebtedness of either of the issuers, then that newly acquired or created
Restricted Subsidiary must become a Subsidiary Guarantor and execute a
supplemental indenture satisfactory to the Trustee and deliver an Opinion of
Counsel to the Trustee within 10 Business Days of the date on which it was
acquired or created. If a Restricted Subsidiary that is not then a Subsidiary
Guarantor guarantees Indebtedness of either of the issuers or any other
Restricted Subsidiary, such Restricted Subsidiary shall execute and deliver a
Guarantee. Leviathan will not permit any of its Restricted Subsidiaries,
directly or indirectly, to guarantee or pledge any assets to secure the payment
of any other Indebtedness of either issuer unless such Restricted Subsidiary
simultaneously executes and delivers a supplemental indenture providing for the
guarantee of the payment of the notes by such Restricted Subsidiary, which
guarantee shall be senior to or pari passu with such Restricted Subsidiary's
guarantee of or pledge to secure such other Indebtedness, unless such other
Indebtedness is Senior Debt, in which case the guarantee of the notes may be
subordinated to the guarantee of such Senior Debt to the same extent as the
notes are subordinated to such Senior Debt. Notwithstanding the foregoing, any
Guarantee of a Restricted Subsidiary that was incurred pursuant to this
paragraph shall provide by its terms that it shall be automatically and
unconditionally released upon the release or discharge of the guarantee which
resulted in the creation of such Restricted Subsidiary's Subsidiary Guarantee,
except a discharge or release by, or as a result of payment under, such
guarantee.

  Designation of Restricted and Unrestricted Subsidiaries

     The General Partner may designate any Restricted Subsidiary to be an
Unrestricted Subsidiary if that designation would not cause a Default or Event
of Default. If a Restricted Subsidiary is designated as an Unrestricted
Subsidiary, all outstanding Investments owned by Leviathan and its Restricted
Subsidiaries in the Subsidiary so designated will be deemed to be an Investment
made as of the time of such designation and will reduce the amount available for
Restricted Payments under the first paragraph of the covenant described above
under the caption "-- Restricted Payments", for Permitted Investments or for
Permitted Business Investments, as applicable. All such outstanding Investments
will be valued at their fair market value at the time of such designation. That
designation will only be permitted if such Restricted Payment, Permitted
Investments or Permitted Business Investments would be permitted at that time
and such

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Restricted Subsidiary otherwise meets the definition of an Unrestricted
Subsidiary. All Subsidiaries of an Unrestricted Subsidiary shall be also
Unrestricted Subsidiaries. The Board of Directors of the General Partner may
redesignate any Unrestricted Subsidiary to be a Restricted Subsidiary if a
Default or Event of Default is not continuing, the redesignation would not cause
a Default or Event of Default and provided that, if at the time of such
designation such Subsidiary is a Subsidiary Guarantor, after giving effect to
such designation, Leviathan and its remaining Restricted Subsidiaries could
incur at least $1.00 of additional Indebtedness under the limitation on
indebtedness included in the first paragraph under the caption "Incurrence of
Indebtedness and Issuance of Disqualified Equity" above. A Subsidiary may not be
designated as an Unrestricted Subsidiary unless at the time of such designation,
(x) it has no Indebtedness other than Non-Recourse Debt; (y) no portion of the
Indebtedness or any other obligation of such Subsidiary (whether contingent or
otherwise and whether pursuant to the terms of such Indebtedness or the terms
governing the organization and operation of such Subsidiary or by law) (A) is
guaranteed by Leviathan or any other Restricted Subsidiary, except as such
Indebtedness is permitted by the covenants under "-- Restricted Payments" and
"-- Incurrence of Indebtedness and Issuance of Disqualified Equity" above, (B)
is recourse to or obligates Leviathan or any Restricted Subsidiary in any way
(including any "claw-back", "keep-well" or "make-well" agreements or other
agreements, arrangements or understandings to maintain the financial performance
or results of operations of such Subsidiary, except as such Indebtedness or
Investment is permitted by the covenants captioned "-- Incurrence of
Indebtedness and Issuance of Disqualified Equity" and "-- Restricted Payments")
or (C) subjects any property or assets of Leviathan or any Restricted
Subsidiary, directly or indirectly, contingently or otherwise, to the
satisfaction thereof; and (z) no Equity Interests of a Restricted Subsidiary are
held by such Subsidiary, directly or indirectly. Upon the designation of a
Restricted Subsidiary that is a Subsidiary Guarantor as an Unrestricted
Subsidiary, the Guarantee of such entity shall be released.

  Sale and Lease-Back Transactions

     Leviathan will not, and will not permit any of its Restricted Subsidiaries
to, enter into any sale and lease-back transaction; provided that Leviathan or
any Restricted Subsidiary that is a Subsidiary Guarantor may enter into a sale
and lease-back transaction if:

          (1) Leviathan or that Subsidiary Guarantor, as applicable, could have
     (a) incurred Indebtedness in an amount equal to the Attributable Debt
     relating to such sale and lease-back transaction under the Fixed Charge
     Coverage Ratio test in the first paragraph of the covenant described above
     under the caption "-- Incurrence of Additional Indebtedness and Issuance of
     Disqualified Equity," and (b) incurred a Lien to secure such Indebtedness
     pursuant to the covenant described above under the caption "-- Liens;"

          (2) the gross cash proceeds of that sale and lease-back transaction
     are at least equal to the fair market value, as determined in good faith by
     the Board of Directors of the General Partner, of the property that is the
     subject of such sale and lease-back transaction; and

          (3) the transfer of assets in that sale and lease-back transaction is
     permitted by, and Leviathan applies the proceeds of such transaction in
     compliance with, the covenant described above under the caption
     "-- Repurchase at the Option of Holders -- Asset Sales."

  Business Activities

     Leviathan will not, and will not permit any Restricted Subsidiary to,
engage in any business other than Permitted Businesses.

  Payments for Consent

     Leviathan will not, and will not permit any of its Subsidiaries to,
directly or indirectly, pay or cause to be paid any consideration to or for the
benefit of any holder of notes for or as an inducement to any consent, waiver or
amendment of any of the terms or provisions of the Indenture or the notes unless
such consideration is offered to be paid and is paid to all holders of the notes
that consent, waive or agree to
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amend in the time frame set forth in the solicitation documents relating to such
consent, waiver or agreement.

  Reports

     Whether or not required by the SEC, so long as any notes are outstanding,
Leviathan will file with the SEC (unless the SEC will not accept such a filing)
within the time periods specified in the SEC's rules and regulations, and upon
request, Leviathan will furnish (without exhibits) to the Trustee for delivery
to the holders of the notes:

          (1) all quarterly and annual financial information that would be
     required to be contained in a filing with the SEC on Forms 10-Q and 10-K if
     Leviathan were required to file such Forms, including a "Management's
     Discussion and Analysis of Financial Condition and Results of Operations"
     and, with respect to the annual information only, a report on the annual
     financial statements by Leviathan's certified independent accountants; and

          (2) all current reports that would be required to be filed with the
     SEC on Form 8-K if Leviathan were required to file such reports.

     If as of the end of any such quarterly or annual period Leviathan has
designated any of its Subsidiaries as Unrestricted Subsidiaries or if Leviathan
owns more than 50% of Western Gulf or UTOS but such entity or any of its
Subsidiaries still is designated as a Joint Venture, then Leviathan shall
deliver (promptly after such SEC filing referred to in the preceding paragraph)
to the Trustee for delivery to the holders of the notes quarterly and annual
financial information required by the preceding paragraph as revised to include
a reasonably detailed presentation, either on the face of the financial
statements or in the footnotes thereto, and in Management's Discussion and
Analysis of Financial Condition and Results of Operations, of the financial
condition and results of operations of Leviathan and its Restricted Subsidiaries
separate from the financial condition and results of operations of the
Unrestricted Subsidiaries and each such designated Joint Venture of Leviathan.

     In addition, whether or not required by the SEC, Leviathan will make such
information available to securities analysts, investors and prospective
investors upon request.

EVENTS OF DEFAULT AND REMEDIES

     Each of the following is an Event of Default:

          (1) default for 30 days in the payment when due of interest on, or
     Liquidated Damages with respect to, the notes, whether or not prohibited by
     the subordination provisions of the Indenture;

          (2) default in payment when due of the principal of or premium, if
     any, on the notes, whether or not prohibited by the subordination
     provisions of the Indenture;

          (3) failure by Leviathan or any of its Subsidiaries to comply with the
     provisions described under the captions "-- Change of Control" or "-- Asset
     Sales."

          (4) failure by Leviathan or any of its Restricted Subsidiaries for 60
     days after notice to comply with any of the other agreements in the
     Indenture (provided that notice need not be given, and an Event of Default
     shall occur, 60 days after any breach of the covenants under "-- Certain
     Covenants -- Restricted Payments," "-- Certain Covenants -- Incurrence of
     Indebtedness and Issuance of Disqualified Equity" and "-- Merger,
     Consolidation or Sale of Assets");

          (5) default under any mortgage, indenture or instrument under which
     there may be issued or by which there may be secured or evidenced any
     Indebtedness for money borrowed by an issuer or any of Leviathan's
     Restricted Subsidiaries (or the payment of which is guaranteed by Leviathan
     or any of

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     its Restricted Subsidiaries), whether such Indebtedness or guarantee now
     exists or is created after the date of the Indenture, if that default:

             (a) is caused by a failure to pay principal of or premium, if any,
        or interest on such Indebtedness prior to the expiration of the grace
        period provided in such Indebtedness on the date of such default (a
        "Payment Default"); or

             (b) results in the acceleration of such Indebtedness prior to its
        express maturity,

     and, in each case, the principal amount of any such Indebtedness, together
     with the principal amount of any other such Indebtedness under which there
     has been a Payment Default or the maturity of which has been so
     accelerated, aggregates $10.0 million or more;

          (6) failure by an issuer or any of Leviathan's Restricted Subsidiaries
     to pay final judgments aggregating in excess of $10.0 million, which
     judgments are not paid, discharged or stayed for a period of 60 days;

          (7) except as permitted by the Indenture, any Guarantee shall be held
     in any judicial proceeding to be unenforceable or invalid or shall cease
     for any reason to be in force and effect or any Subsidiary Guarantor, or
     any Person acting on behalf of any Subsidiary Guarantor, shall deny or
     disaffirm its obligations under its Guarantee; and

          (8) certain events of bankruptcy or insolvency with respect to
     Leviathan or any of its Restricted Subsidiaries that is a Significant
     Subsidiary or any group of Restricted Subsidiaries that, taken together,
     would constitute a Significant Subsidiary.

     In the case of an Event of Default arising from certain events of
bankruptcy or insolvency, with respect to the issuers, all outstanding notes
will become due and payable immediately without further action or notice. If any
other Event of Default occurs and is continuing, the Trustee or the holders of
at least 25% in principal amount of the then outstanding notes may declare all
the notes to be due and payable immediately. Notwithstanding the foregoing, so
long as any Credit Facility shall be in full force and effect, if an Event of
Default pursuant to clause (5) above with regard to such Credit Facility shall
have occurred and be continuing, the notes shall not become due and payable
until the earlier to occur of (x) five business days following delivery of
written notice of such acceleration of the notes to the agent under such Credit
Facility and (y) the acceleration of any Indebtedness under such Credit
Facility.

     Holders of the notes may not enforce the Indenture or the notes except as
provided in the Indenture. Subject to certain limitations, holders of a majority
in principal amount of the then outstanding notes may direct the Trustee in its
exercise of any trust or power. The Trustee may withhold from holders of the
notes notice of any continuing Default or Event of Default (except a Default or
Event of Default relating to the payment of principal or interest) if it
determines that withholding notice is in their interest.

     The holder of a majority in aggregate principal amount of the notes then
outstanding by notice to the Trustee may on behalf of the holders of all of the
notes waive any existing Default or Event of Default and its consequences under
the Indenture except a continuing Default or Event of Default in the payment of
interest (or Liquidated Damages, if any) on, or the principal of, the notes.

     The Issuers and the Subsidiary Guarantors are required to deliver to the
Trustee annually a statement regarding compliance with the Indenture. Upon any
officer of the General Partner or Leviathan Finance becoming aware of any
Default or Event of Default, the Issuers are required to deliver to the Trustee
a statement specifying such Default or Event of Default.

NO PERSONAL LIABILITY OF DIRECTORS, OFFICERS, EMPLOYEES AND STOCKHOLDERS

     No past, present or future director, officer, partner, employee,
incorporator, stockholder or member of the issuers, the General Partner, or any
Subsidiary Guarantor, as such, shall have any liability for any obligations of
the issuers or the Subsidiary Guarantors under the notes, the Indenture, the
Guarantees or for any claim based on, in respect of, or by reason of, such
obligations or their creation. Each holder of
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notes by accepting a note waives and releases all such liability. The waiver and
release are part of the consideration for issuance of the notes. The waiver may
not be effective to waive liabilities under the federal securities laws.

LEGAL DEFEASANCE AND COVENANT DEFEASANCE

     The issuers may, at their option and at any time, elect to have all of the
issuers' obligations discharged with respect to the outstanding notes and all
obligations of the Subsidiary Guarantors discharged with respect to their
Guarantees ("Legal Defeasance") except for:

          (1) the rights of holders of outstanding notes to receive payments in
     respect of the principal of, premium, if any, and interest on such notes
     when such payments are due (but not the Change of Control Payment or the
     payment pursuant to an Asset Sale Offer) from the list referred to below;

          (2) the issuer's obligations with respect to the notes concerning
     issuing temporary notes, registration of notes, mutilated, destroyed, lost
     or stolen notes and the maintenance of an office or agency for payment and
     money for security payments held in trust;

          (3) the rights, powers, trusts, duties and immunities of the Trustee,
     and the issuers' obligations in connection therewith;

          (4) the Legal Defeasance provisions of the Indenture; and

          (5) the issuers' rights of optional redemption.

     In addition, Leviathan may, at its option and at any time, elect to have
the obligations of the issuers and the Guarantors released with respect to
certain covenants that are described in the Indenture ("Covenant Defeasance")
and thereafter any omission to comply with those covenants shall not constitute
a Default or Event of Default with respect to the notes. In the event Covenant
Defeasance occurs, certain events (not including non-payment, bankruptcy,
receivership, rehabilitation and insolvency events) described under "Events of
Default" will no longer constitute an Event of Default with respect to the
notes.

     In order to exercise either Legal Defeasance or Covenant Defeasance:

          (1) the issuers must irrevocably deposit with the Trustee, in trust,
     for the benefit of the holders of the notes, cash in U.S. dollars,
     non-callable U.S. Government Obligations, or a combination thereof, in such
     amounts as will be sufficient, in the opinion of a nationally recognized
     firm of independent public accountants, to pay the principal of, premium,
     if any, and interest on the outstanding notes at the Stated Maturity
     thereof or on the applicable redemption date, as the case may be, and
     Leviathan must specify whether the notes are being defeased to maturity or
     to a particular redemption date;

          (2) in the case of Legal Defeasance, Leviathan shall have delivered to
     the Trustee an Opinion of Counsel reasonably acceptable to the Trustee
     confirming that (a) Leviathan has received from, or there has been
     published by, the Internal Revenue Service a ruling or (b) since the date
     of the Indenture, there has been a change in the applicable federal income
     tax law, in either case to the effect that, and based thereon such Opinion
     of Counsel shall confirm that, the holders of the outstanding notes will
     not recognize income, gain or loss for federal income tax purposes as a
     result of such Legal Defeasance and will be subject to federal income tax
     on the same amounts, in the same manner and at the same times as would have
     been the case if such Legal Defeasance had not occurred;

          (3) in the case of Covenant Defeasance, Leviathan shall have delivered
     to the Trustee an Opinion of Counsel reasonably acceptable to the Trustee
     confirming that the holders of the outstanding notes will not recognize
     income, gain or loss for federal income tax purposes as a result of such
     Covenant Defeasance and will be subject to federal income tax on the same
     amounts, in the

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     same manner and at the same times as would have been the case if such
     Covenant Defeasance had not occurred;

          (4) no Default or Event of Default shall have occurred and be
     continuing either: (a) on the date of such deposit (other than a Default or
     Event of Default resulting from the incurrence of Indebtedness all or a
     portion of the proceeds of which shall be applied to such deposit); or (b)
     or insofar as Events of Default from bankruptcy or insolvency events are
     concerned, at any time in the period ending on the 91st day after the date
     of deposit;

          (5) such Legal Defeasance or Covenant Defeasance will not result in a
     breach or violation of, or constitute a default under any material
     agreement or instrument (other than the Indenture) to which Leviathan or
     any of its Restricted Subsidiaries is a party or by which Leviathan or any
     of its Restricted Subsidiaries is bound;

          (6) Leviathan must have delivered to the Trustee an Opinion of Counsel
     to the effect that after the 91st day following the deposit, the trust
     funds will not be subject to the effect of any applicable bankruptcy,
     insolvency, reorganization or similar laws affecting creditors' rights
     generally;

          (7) Leviathan must deliver to the Trustee an Officers' Certificate
     stating that the deposit was not made by Leviathan with the intent of
     preferring the holders of notes over the other creditors of Leviathan with
     the intent of defeating, hindering, delaying or defrauding other creditors
     of Leviathan; and

          (8) Leviathan must deliver to the Trustee an Officers' Certificate and
     an Opinion of Counsel, each stating that all conditions precedent relating
     to the Legal Defeasance or the Covenant Defeasance have been complied with.

AMENDMENT, SUPPLEMENT AND WAIVER

     Without the consent of each holder affected, an amendment or waiver may not
(with respect to any notes held by a non-consenting holder):

          (1) reduce the principal amount of notes whose holders must consent to
     an amendment, supplement or waiver;

          (2) reduce the principal of or change the fixed maturity of any note
     or alter or waive the provisions with respect to the redemption of the
     notes (other than provisions relating to the covenants described above
     under the caption "-- Repurchase at the Option of Holders"):

          (3) reduce the rate of or change the time for payment of interest on
     any note;

          (4) waive a Default or Event of Default in the payment of principal of
     or premium, if any, or interest on the notes (except a rescission of
     acceleration of the notes by the holders of at least a majority in
     aggregate principal amount of the notes and a waiver of the payment default
     that resulted from such acceleration);

          (5) make any note payable in money other than that stated in the
     notes;

          (6) make any change in the provisions of the Indenture relating to
     waivers of past Defaults or the rights of holders of notes to receive
     payments of principal of or premium, if any, or interest on the notes;

          (7) waive a redemption payment with respect to any note (other than a
     payment required by one of the covenants described above under the caption
     "-- Repurchase at the Option of Holders");

          (8) except as otherwise permitted in the Indenture, release any
     Subsidiary Guarantor from its obligations under its Guarantee or the
     Indenture or change any Guarantee in any manner that would adversely affect
     the rights of holders; or

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<PAGE>   115

          (9) make any change in the preceding amendment and waiver provisions
     (except to increase any percentage set forth therein).

     In addition, any amendment to, or waiver of, the provisions of the
Indenture relating to subordination that adversely affects the rights of the
holders of the notes will require the consent of the holders of at least 75% in
aggregate principal amount of notes then outstanding.

     Notwithstanding the preceding, without the consent of any holder of notes,
the issuers, the Subsidiary Guarantors and the Trustee may amend or supplement
the Indenture or the notes:

          (1) to cure any ambiguity, defect or inconsistency;

          (2) to provide for uncertificated notes in addition to or in place of
     certificated notes;

          (3) to provide for the assumption of an issuer's or Subsidiary
     Guarantor's obligations to holders of notes in the case of a merger or
     consolidation or sale of all or substantially all of such issuer's assets;

          (4) to add or release Subsidiary Guarantors pursuant to the terms of
     the Indenture;

          (5) to make any change that would provide any additional rights or
     benefits to the holders of notes or surrender any right or power conferred
     upon the issuers or the Subsidiary Guarantors by the Indenture that does
     not adversely affect the rights under the Indenture of any holder of the
     Notes;

          (6) to comply with requirements of the SEC in order to effect or
     maintain the qualification of the Indenture under the Trust Indenture Act;

          (7) to evidence or provide for the acceptance of appointment under the
     Indenture of a successor Trustee;

          (8) to add any additional Events of Default; or

          (9) to secure the notes and/or the Guarantees.

CONCERNING THE TRUSTEE

     If the Trustee becomes a creditor of an issuer or any Subsidiary Guarantor,
the Indenture limits its right to obtain payment of claims in certain cases, or
to realize on certain property received in aspect of any such claim as security
or otherwise. The Trustee will be permitted to engage in other transactions;
however, if it acquires any conflicting interest it must eliminate such conflict
within 90 days, apply to the SEC for permission to continue or resign.

     The holders of a majority in principal amount of the then outstanding notes
will have the right to direct the time, method and place of conducting any
proceeding for exercising any remedy available to the Trustee, subject to
certain exceptions. The Indenture provides that in case an Event of Default
shall occur and be continuing, the Trustee will be required, in the exercise of
its power, to use the degree of care of a prudent person the conduct of his own
affairs. Subject to such provisions, the Trustee will be under no obligation to
exercise any of its rights or powers under the Indenture at the request of any
holder of notes, unless such holder shall have offered to the Trustee security
and indemnity satisfactory to it against any loss, liability or expense.

ADDITIONAL INFORMATION

     Anyone who receives this prospectus may obtain a copy of the Indenture and
Registration Rights Agreement without charge by writing to Leviathan at El Paso
Energy Building, 1001 Louisiana, Houston, Texas 77002, Attention: Investor
Relations.

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BOOK-ENTRY, DELIVERY AND FORM


     Except as set forth below, the Series B notes will be represented by one
permanent global registered note in global form and the Series A notes, if any
remain outstanding after the exchange offer, will be represented by one
permanent global [unregistered] note, in each case without interest coupons (the
"Global notes"). The Global notes will be deposited with, or on behalf of, The
Depository Trust Company ("DTC") and registered in the name of Cede & Co., as
nominee of DTC, or will remain in the custody of the Trustee pursuant to the
FAST Balance Certificate Agreement between DTC and the Trustee.


     The descriptions of the operations and procedures of DTC, the Euroclear
System ("Euroclear") and Cedel Bank ("Cedel") set forth below are provided
solely as a matter of convenience. These operations and procedures are solely
within the control of the respective settlement systems and are subject to
change by them from time to time. Neither Leviathan nor the Initial Purchasers
takes any responsibility for these operations or procedures, and investors are
urged to contact the relevant system or its participants directly to discuss
these matters.

DEPOSITARY PROCEDURES

     DTC has advised Leviathan that DTC is a limited-purpose trust company
created to hold securities for its participating organizations (collectively,
the "Direct Participants") and to facilitate the clearance and settlement of
transactions in those securities between Direct Participants through electronic
book-entry changes in accounts of Participants. The Direct Participants include
securities brokers and dealers (including the Initial Purchasers), banks, trust
companies, clearing corporations and certain other organizations, including
Euroclear and Cedel. Access to DTC's system is also available to other entities
that clear through or maintain a direct or indirect, custodial relationship with
a Direct Participant (collectively, the "Indirect Participants").

     DTC has advised Leviathan that, pursuant to DTC's procedures, (i) upon
deposit of the Global notes, DTC will credit the accounts of the Direct
Participants designated by the Initial Purchasers with portions of the principal
amount of the Global notes that have been allocated to them by the Initial
Purchasers, and (ii) DTC will maintain records of the ownership interests of
such Direct Participants in the Global notes and the transfer of ownership
interests by and between Direct Participants. DTC will not maintain records of
the ownership interests of, or the transfer of ownership interests by and
between, Indirect Participants or other owners of beneficial interests in the
Global notes. Direct Participants and Indirect Participants must maintain their
own records of the ownership interests of, and the transfer of ownership
interests by and between, Indirect Participants and other owners of beneficial
interests in the Global notes.

     The laws of some states in the United States require that certain persons
take physical delivery in definitive, certificated form, of securities that they
own. This may limit or curtail the ability to transfer beneficial interest in a
Global note to such persons. Because DTC can act only on behalf of Direct
Participants, which in turn act on behalf of Indirect Participants and others,
the ability of a person having a beneficial interest in a Global note to pledge
such interest to persons or entities that are not Direct Participants in DTC, or
to otherwise take actions in respect of such interests, may be affected by the
lack of physical certificates evidencing such interests. For certain other
restrictions on the transferability of the notes see "-- Transfers of Interests
in Global Notes for Certificated Notes."

     EXCEPT AS DESCRIBED IN "-- TRANSFERS ON INTERESTS IN GLOBAL NOTES FOR
CERTIFICATED NOTES," OWNERS OF BENEFICIAL INTERESTS IN THE GLOBAL NOTES WILL NOT
HAVE NOTES REGISTERED IN THEIR NAMES, WILL NOT RECEIVE PHYSICAL DELIVERY OF
NOTES IN CERTIFICATED FORM AND WILL NOT BE CONSIDERED THE REGISTERED OWNERS OR
HOLDERS THEREOF UNDER THE INDENTURE FOR ANY PURPOSE.

     Under the terms of the Indenture, the issuers, the Subsidiary Guarantors
and the Trustee will treat the persons in whose names the notes are registered
(including notes represented by Global notes) as the owners thereof for the
purpose of receiving payments and for any and all other purposes whatsoever.
Payments in respect of the principal of premium, if any, and interest and
Liquidated Damages, if any, on Global notes registered in the name of DTC or its
nominee will be payable by the Trustee to DTC or its

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nominee as the registered holder under the Indenture. Consequently, none of the
issuers, the Trustee nor any agent of the issuers or the Trustee has or will
have any responsibility or liability for (i) any aspect of DTC's records or any
Direct Participant's or Indirect Participant's records relating to or payments
made on account of beneficial ownership interests in the Global notes or for
maintaining, supervising or reviewing any of DTC's records or any Direct
Participant's or Indirect Participant's records relating to the beneficial
ownership interests in any Global note or (ii) any other matter relating to the
actions and practices of DTC or any of its Direct Participants or Indirect
Participants.

     DTC has advised the issuers that its current payment practice (for payments
of principal, interest and the like) with respect to securities such as the
notes is to credit the accounts of the relevant Direct Participants with such
payment on the payment date in amounts proportionate to such Direct
Participant's respective ownership interests in the Global notes as shown on
DTC's records. Payments by Direct Participants and Indirect Participants to the
beneficial owners of the notes will be governed by standing instructions and
customary practices between them and will not be the responsibility of DTC, the
Trustee, the issuers or the Subsidiary Guarantors. None of the issuers, the
Subsidiary Guarantors or the Trustee will be liable for any delay by DTC or its
Direct Participants or Indirect Participants in identifying the beneficial
owners of the notes, and the issuers and the Trustee may conclusively relay on
and will be protected in relying on instructions from DTC or its nominee as the
registered owner of the notes for all purposes.

     The Global notes will trade in DTC's Same-day Funds Settlement System and,
therefore, transfers between Direct Participants in DTC will be effected in
accordance with DTC's procedures, and will be settled in immediately available
funds. Transfers between Indirect Participants (other than Indirect Participants
who hold an interest in the notes through Euroclear or CEDEL) who hold an
interest through a Direct Participant will be effected in accordance with the
procedures of such Direct Participant but generally will settle in immediately
available funds. Transfers between and among Indirect Participants who hold
interests in the notes through Euroclear and CEDEL will be effected in the
ordinary way in accordance with their respective rules and operating procedures.

     Subject to compliance with the transfer restrictions applicable to the
notes described herein, cross-market transfers between Direct Participants in
DTC, on the one hand, and Indirect Participants who hold interests in the notes
through Euroclear or CEDEL, on the other hand, will be effected by Euroclear's
or CEDEL's respective Nominee through DTC in accordance with DTC's rules on
behalf of Euroclear or CEDEL; however, delivery of instructions relating to
crossmarket transactions must be made directly to Euroclear or CEDEL and within
their established deadlines (Brussels time for Euroclear and UK time for CEDEL).
Indirect Participants who hold interest in the notes through Euroclear and CEDEL
may not deliver instructions directly to Euroclear's and CEDEL's Nominee.
Euroclear and CEDEL will, if the transaction meets its settlement requirements,
deliver instructions to its respective Nominee to deliver or receive interests
on Euroclear's or CEDEL's behalf in the relevant Global note in DTC, and make or
receive payment in accordance with normal procedures for same-day fund
settlement applicable to DTC.

     Because of time zone differences, the securities accounts of an Indirect
Participant who holds an interest in the notes through Euroclear or CEDEL
purchasing an interest in a Global Note from a Direct Participant in DTC will be
credited, and any such crediting will be reported to Euroclear or CEDEL during
the European business day immediately following the settlement date of DTC in
New York. Although recorded in DTC's accounting records as of DTC's settlement
date in New York, Euroclear and CEDEL customers will not access to the cash
amount credited to their accounts as a result of a sale of an interest in a
Regulation S Global Note to a DTC Participant unit the European business for
Euroclear and CEDEL immediately following DTC's settlement date.

     DTC has advised Leviathan that it will take any action permitted to be
taken by a holder of notes only at the direction of one or more Direct
Participants to whose account interests in the Global notes are credited and
only in respect of such portion of the aggregate principal amount of the notes
to which such Direct Participant or Direct Participants has or have given
direction. However, if there is an Event of Default under the notes, DTC
reserves the right to exchange Global notes (without the direction of one or

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more of its Direct Participants) for legended notes in certificated form, and to
distribute such certificated forms of notes to its Direct Participants. See
"-- Transfers of Interests in Global Notes for Certificated Notes" below.

     Although DTC, Euroclear and CEDEL have agreed to the foregoing procedures
to facilitate transfers of interests in the Global notes among Direct
Participants, including Euroclear and CEDEL, they are under no obligation to
perform or to continue to perform such procedures, and such procedures may be
discontinued at any time. None of the issuers, the Subsidiary Guarantors, the
Initial Purchasers or the Trustee shall have any responsibility for the
performance by DTC, Euroclear and CEDEL or their respective Direct and Indirect
Participants of their respective obligations under the rules and procedures
governing any of their operations.

     The information in this section concerning DTC, Euroclear and CEDEL and
their book-entry systems has been obtained from sources that the issuers believe
to be reliable, but the issuers take no responsibility for the accuracy thereof.

  Transfers of Interests in Global Notes for Certificated Notes

     An entire Global note may be exchanged for definitive notes in registered,
certificated form without interest coupons ("Certificated notes") if (i) DTC (x)
notifies the issuers that it is unwilling or unable to continue as depositary
for the Global notes and the issuers thereupon fail to appoint a successor
depositary within 90 days or (y) has ceased to be a clearing agency registered
under the Exchange Act, (ii) the issuers, at their option, notify the Trustee in
writing that they elect to cause the issuance of Certificated notes or (iii)
there shall have occurred and be continuing a Default or an Event of Default
with respect to the notes. In any such case, the issuers will notify the Trustee
in writing that, upon surrender by the Direct and Indirect Participants of their
interest in such Global note, Certificated notes will be issued to each person
that such Direct and Indirect Participants and the DTC identify as being the
beneficial owner of the related notes.

     Beneficial interests in the Global notes held by any Direct or Indirect
Participant may be exchanged for Certificated notes upon request to DTC, by such
Direct Participant (for itself or on behalf of an Indirect Participant), to the
Trustee in accordance with customary DTC procedures. Certificated notes
delivered in exchange for any beneficial interest in any Global note will be
registered in the names, and issued in any approved denominations, requested by
DTC on behalf of such Direct or Indirect Participants (in accordance with DTC's
customary procedures).

     None of the issuers, the Subsidiary Guarantors or the Trustee will be
liable for any delay by the holder of any Global note or DTC in identifying the
beneficial owners of notes, and the issuers and the Trustee may conclusively
rely on, and will be protected in relying on, instructions from the holder of
the Global note or DTC for all purposes.

  Same Day Settlement and Payment

     The Indenture requires that payments in respect of the notes represented by
the Global notes (including principal, premium, if any, interest and Liquidated
Damages, if any) be made by wire transfer of immediately available same day
funds to the accounts specified by the holder of interests in such Global Note.
With respect to Certificated notes, the issuers will make all payments of
principal, premium, if any, interest and Liquidated Damages, if any, by wire
transfer of immediately available same day funds to the accounts specified by
the holders thereof or, if no such account is specified, by mailing a check to
each such holder's registered address. The issuers expect that secondary trading
in the Certificated notes will also be settled in immediately available funds.

REGISTRATION RIGHTS; LIQUIDATED DAMAGES

     Leviathan, Leviathan Finance, the Subsidiary Guarantors and the Initial
Purchasers entered into the Registration Rights Agreement on May 27, 1999. For a
summary discussion of the terms of the

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Registration Rights Agreement, see "Series A Notes Registration Rights"
beginning on page 131 of this prospectus.


CERTAIN DEFINITIONS

     Set forth below are certain defined terms used in the Indenture. Reference
is made to the Indenture for a full disclosure of all such terms, as well as any
other capitalized terms used herein for which no definition is provided.

     "Acquired Debt" means, with respect to any specified Person:

          (1) Indebtedness of any other Person existing at the time such other
     Person is merged with or into or became a Subsidiary of such specified
     Person, whether or not such Indebtedness is incurred in connection with, or
     in contemplation of, such other Person merging with or into, or becoming a
     Subsidiary of, such specified Person, but excluding Indebtedness which is
     extinguished, retired or repaid in connection with such Person merging with
     or becoming a Subsidiary of such specific Person; and

          (2) Indebtedness secured by a Lien encumbering any asset acquired by
     such specified Person.

     "Affiliate" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person. For purposes of this definition, "control,"
as used with respect to any Person, shall mean the possession, directly or
indirectly, of the power to direct or cause the direction of the management or
policies of such Person, whether through the ownership of voting securities, by
agreement or otherwise; provided that beneficial ownership of 10% or more of the
Voting Stock of a specified Person shall be deemed to be control by the other
Person; provided, further, that any third Person which also beneficially owns
10% or more of the Voting Stock of a specified Person shall not be deemed to be
Affiliate of either the specified Person or the other Person merely because of
such common ownership in such specified Person. For purposes of this definition,
the terms "controlling," "controlled by" and "under common control with" shall
have correlative meanings. Notwithstanding the foregoing, the term "Affiliate"
shall not include a Restricted Subsidiary of any specified Person.

     "Asset Sale" means:

          (1) the sale, lease, conveyance or other disposition of any assets or
     rights, other than sales of inventory in the ordinary course of business
     consistent with past practices; provided that the sale, conveyance or other
     disposition of all or substantially all of the assets of Leviathan or
     Leviathan and its Restricted Subsidiaries taken as a whole will be governed
     by the provisions of the Indenture described above under the caption
     "-- Change of Control", and/or the provisions described above under the
     caption "-- Merger, Consolidation or Sale of Assets" and not by the
     provisions of the Asset Sale covenant; and

          (2) the issuance of Equity Interests by any of Leviathan's Restricted
     Subsidiaries or the sale by Leviathan or any of its Restricted Subsidiaries
     of Equity Interests in any of its Restricted Subsidiaries;

Notwithstanding the preceding, the following items shall not be deemed to be
Asset Sales:

          (1) any single transaction or series of related transactions that: (a)
     involves assets having a fair market value of less than $1.0 million; or
     (b) results in net proceeds to Leviathan and its Restricted Subsidiaries of
     less than $1.0 million;

          (2) a transfer of assets between or among Leviathan and its Restricted
     Subsidiaries;

          (3) an issuance of Equity Interests by a Restricted Subsidiary to
     Leviathan or to another Restricted Subsidiary;

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          (4) a Restricted Payment that is permitted by the covenant described
     above under the caption "-- Restricted Payments;" and

          (5) a transaction of the type described in the last paragraph of the
     covenant entitled "Asset Sales."

     "Attributable Debt" in respect of a Sale and Lease-Back Transaction means,
at the time of determination, the present value of the obligation of the lessee
for net rental payments during the remaining term of the lease included in such
Sale and Lease-Back Transaction including any period for which such lease has
been extended or may, at the option of the lessor, be extended. Such present
value shall be calculated using a discount rate equal to the rate of interest
implicit in such transaction, determined in accordance with GAAP.

     "Available Cash" has the meaning assigned to such term in the Partnership
Agreement, as in effect on the date of the Indenture.

     "Capital Lease Obligation" means, at the time any determination thereof is
to be made, the amount of the liability in respect of a capital lease that would
at that time be required to be capitalized on a balance sheet in accordance with
GAAP.

     "Cash Equivalent" means:

          (1) United States dollars or, in an amount up to the amount necessary
     or appropriate to fund local operating expenses, other currencies;

          (2) securities issued or directly and fully guaranteed or insured by
     the United States government or any agency or instrumentality thereof
     (provided that the full faith and credit of the United States is pledged in
     support thereof) having maturities of not more than one year from the date
     of acquisition;

          (3) certificates of deposit, time deposits and Eurodollar deposits
     with maturities of one year or less from the date of acquisition, bankers'
     acceptances with maturities not exceeding 365 days, demand and overnight
     bank deposits and other similar types of investments routinely offered by
     commercial banks, in each case, with any domestic commercial bank having
     capital and surplus in excess of $500.0 million and a Thompson Bank Watch
     Rating of "B" or better or any commercial bank of any other country that is
     a member of the Organization for Economic Cooperation and Development
     ("OECD") and has total assets in excess of $500.0 million;

          (4) repurchase obligations with a term of not more than seven days for
     underlying securities of the types described in clauses (2) and (3) above
     entered into with any financial institution meeting the qualifications
     specified in clause (3) above;

          (5) commercial paper having one of the two highest ratings obtainable
     from Moody's Investors Service, Inc. or Standard & Poor's Ratings Group and
     in each case maturing within six months after the date of acquisition; and

          (6) money market funds at least 95% of the assets of which constitute
     Cash Equivalents of the kinds described in clauses (1) through (5) of this
     definition.

     "Cash from Operations" shall have the meaning assigned to such term in the
Partnership Agreement, as in effect on the date of the Indenture.

     "Change of Control" means the occurrence of any of the following:

          (1) the sale, transfer, lease, conveyance or other disposition (other
     than by way of merger or consolidation), in one or a series of related
     transactions, of all or substantially all of the assets of Leviathan and
     its Restricted Subsidiaries taken as a whole to any "person" (as such term
     is used in Section 13(d)(3) of the Exchange Act) other than the El Paso
     Group;

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          (2) the adoption of a plan relating to the liquidation or dissolution
     of Leviathan or the General Partner; and

          (3) such time as the El Paso Group ceases to own, directly or
     indirectly, the general partner interests of Leviathan, or members of the
     El Paso Group cease to serve as the only general partners of Leviathan.

     Notwithstanding the foregoing, a conversion of Leviathan from a limited
partnership to a corporation, limited liability company or other form of entity
or an exchange of all of the outstanding limited partnership interests for
capital stock in a corporation, for member interests in a limited liability
company or for Equity Interests in such other form of entity shall not
constitute a Change of Control, so long as following such conversion or exchange
the El Paso Group beneficially owns, directly or indirectly, in the aggregate
more than 50% of the Voting Stock of such entity, or continues to own a
sufficient number of the outstanding shares of Voting Stock of such entity to
elect a majority of its directors, managers, trustees or other persons serving
in a similar capacity for such entity.

     "Consolidated Cash Flow" means, with respect to any Person for any period,
the Consolidated Net Income of such Person for such period plus:

          (1) an amount equal to the dividends or distributions paid during such
     period in cash or Cash Equivalents to such Person or any of its Restricted
     Subsidiaries by a Person that is not a Restricted Subsidiary of such
     Person; plus

          (2) an amount equal to any extraordinary loss of such Person and its
     Restricted Subsidiaries plus any net loss realized by such Person and its
     Restricted Subsidiaries in connection with an Asset Sale, to the extent
     such losses were deducted in computing such Consolidated Net Income; plus

          (3) the provision for taxes based on income or profits of such Person
     and its Restricted Subsidiaries for such period, to the extent that such
     provision for taxes was deducted in computing such Consolidated Net Income;
     plus

          (4) the consolidated interest expense of such Person and its
     Restricted Subsidiaries for such period, whether paid or accrued
     (including, without limitation, amortization of debt issuance costs and
     original issue discount, non-cash interest payments, the interest component
     of any deferred payment obligations, the interest component of all payments
     associated with Capital Lease Obligations, imputed interest with aspect to
     Attributable Debt, commissions, discounts and other fees and charges
     incurred in respect of letter of credit or bankers' acceptance financings,
     and net payments, if any, pursuant to Hedging Obligations), to the extent
     that any such expense was deducted in computing such Consolidated Net
     Income, excluding any such expenses to the extent incurred by a Person that
     is not a Restricted Subsidiary of the Person for which the calculation is
     being made; plus

          (5) depreciation, depletion and amortization (including amortization
     of goodwill and other intangibles but excluding amortization of prepaid
     cash expenses that were paid in a prior period) and other non-cash expenses
     (excluding any such non-cash expense to the extent that it represents an
     accrual of or reserve for cash expenses in any future period or
     amortization of a prepaid cash expense that was paid in a prior period) of
     such Person and its Restricted Subsidiaries for such period to the extent
     that such depreciation, amortization and other non-cash expenses were
     deducted in computing such Consolidated Net Income (excluding any such
     expenses to the extent incurred by a Person that is not a Restricted
     Subsidiary;) minus

          (6) non-cash items increasing such Consolidated Net Income for such
     period, other than items that were accrued in the ordinary course of
     business, in each case, on a consolidated basis and determined in
     accordance with GAAP.

     Notwithstanding the preceding, the provision for taxes based on the income
or profits of, and the depreciation and amortization and other non-cash charges
of, a Restricted Subsidiary of Leviathan shall be added to Consolidated Net
Income to compute Consolidated Cash Flow of Leviathan only to the extent

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that a corresponding amount would be permitted at the date of determination to
be dividended or distributed to Leviathan by such Restricted Subsidiary without
prior approval (that has not been obtained), pursuant to the terms of its
charter and all agreements, instruments, judgments, decrees, orders, statutes,
rules and governmental regulations applicable to that Restricted Subsidiary or
its stockholders.

     "Consolidated Net Income" means, with respect to any specified Person for
any period, the aggregate of the Net Income of such Person and its Restricted
Subsidiaries for such period, on a consolidated basis, determined in accordance
with GAAP; provided that:

          (1) the aggregate Net Income (but not net loss in excess of such
     aggregate Net Income) of all Persons that are Unrestricted Subsidiaries
     shall be excluded (without duplication);

          (2) the earnings included therein attributable to all entities that
     are accounted for by the equity method of accounting and the aggregate Net
     Income (but not net loss in excess of such aggregate Net Income) included
     therein attributable to all entities constituting Joint Ventures that are
     accounted for on a consolidated basis (rather than by the equity method of
     accounting) shall be excluded;

          (3) the Net Income of any Restricted Subsidiary shall be excluded to
     the extent that the declaration or payment of dividends or similar
     distributions by that Restricted Subsidiary of that Net Income is not at
     the date of determination permitted without any prior governmental approval
     (that has not been obtained) or, directly or indirectly, by operation of
     the terms of its charter or any agreement (other than the Indenture or its
     Guarantee), instrument, judgment, decree, order, statute, rule or
     governmental regulation applicable to that Restricted Subsidiary or its
     stockholders;

          (4) the Net Income of any Person acquired in a pooling of interests
     transaction for any period prior to the date of such acquisition shall be
     excluded; and

          (5) the cumulative effect of a change in accounting principles shall
     be excluded.

     "Consolidated Net Worth" means, with respect to any Person as of any date,
the sum of:

          (1) the consolidated equity of the common stockholders (or
     consolidated partners' capital in the case of a partnership) of such Person
     and its consolidated Subsidiaries as of such date as determined in
     accordance with GAAP; plus

          (2) the respective amounts reported on such Person's balance sheet as
     of such date with respect to any series of preferred stock (other than
     Disqualified Equity) that by its terms is not entitled to the payment of
     dividends unless such dividends may be declared and paid only out of net
     earnings in respect of the year of such declaration and payment, but only
     to the extent of any cash received by such Person upon issuance of such
     preferred stock.

     "Credit Facilities" means, with respect to Leviathan, Leviathan Finance or
any Restricted Subsidiary, one or more debt facilities or commercial paper
facilities, including the Leviathan Credit Facility, providing for revolving
credit loans, term loans, receivables financing (including through the sale of
receivables to such lenders or to special purpose entities formed to borrow from
such lenders against such receivables) or letters of credit, in each case, as
amended, restated, modified, renewed, refunded, replaced or refinanced in whole
or in part from time to time.

     "Default" means any event that is, or with the passage of time or the
giving of notice or both would be, an Event of Default.

     "Designated Senior Debt" means any Senior Debt permitted under the
Indenture the principal amount of which is $25.0 million or more and that has
been designated by Leviathan as "Designated Senior Debt."

     "Disqualified Equity" means any Equity Interest that, by its terms (or by
the terms of any security into which it is convertible, or for which it is
exchangeable, in each case at the option of the holder

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thereof), or upon the happening of any event, matures or is mandatorily
redeemable, pursuant to a sinking fund obligation or otherwise, or redeemable at
the option of the holder thereof, in whole or in part, on or prior to the date
on which the notes mature. Notwithstanding the preceding sentence, any Equity
Interest that would constitute Disqualified Equity solely because the holders
thereof have the right to require Leviathan or a Restricted Subsidiary to
repurchase such Equity Interests upon the occurrence of a change of control or
an asset sale shall not constitute Disqualified Equity if the terms of such
Equity Interests provide that Leviathan or Restricted Subsidiary may not
repurchase or redeem any such Equity Interests pursuant to such provisions
unless such repurchase or redemption complies with the covenant described above
under the caption "-- Certain Covenants -- Restricted Payments."

     "El Paso Energy" means El Paso Energy Corporation, a Delaware corporation,
and its successors.

     "El Paso Group" means, collectively, (1) El Paso Energy, (2) each Person of
which El Paso Energy is a direct or indirect Subsidiary and (3) each Person
which is a direct or indirect Subsidiary of any Person described in (1) or (2)
above.

     "Equity Interests" means:

          (1) in the case of a corporation, corporate stock;

          (2) in the case of an association or business entity, any and all
     shares, interests, participations, rights or other equivalents (however
     designated) of corporate stock;

          (3) in the case of a partnership or limited liability company,
     partnership or membership interests (whether general or limited);

          (4) any other interest or participation that confers on a Person the
     right to receive a share of the profits and losses of, or distributions of
     assets of, the issuing Person, and any rights (other than debt securities
     convertible into capital stock) warrants or options exchangeable for or
     convertible into such capital stock; and

          (5) all warrants, options or other rights to acquire any of the
     interests described in clauses (1) - (4) above (but excluding any debt
     security that is convertible into, or exchangeable for, any of the
     interests described in clauses (1) - (4) above).

     "Equity Offering" means any sale for cash of Equity Interests of Leviathan
(excluding sales made to any Restricted Subsidiary and excluding sales of
Disqualified Equity).

     "Existing Indebtedness" means the aggregate principal amount of
Indebtedness of Leviathan and its Restricted Subsidiaries in existence on the
date of the Indenture, which (excluding Indebtedness outstanding under the
Leviathan Credit Facility) is zero.

     "Fixed Charges" means, with respect to any Person for any period, without
duplication, (A) the sum of:

          (1) the consolidated interest expense of such Person and its
     Restricted Subsidiaries (excluding for purposes of this clause (1)
     consolidated interest expense included therein that is attributable to
     Indebtedness of a Person that is not a Restricted Subsidiary of the Person
     for which the calculation is being made) for such period, whether paid or
     accrued, including, without limitation, amortization of debt issuance costs
     and original issue discount, non-cash interest payments, the interest
     component of any deferred payment obligations, the interest component of
     all payments associated with Capital Lease Obligations, imputed interest
     with respect to Attributable Debt, commissions, discounts, and other fees
     and charges incurred in respect of letter of credit or bankers' acceptance
     financings, and net payments, if any, pursuant to Hedging Obligations; plus

          (2) the consolidated interest of such Person and its Restricted
     Subsidiaries that was capitalized during such period (excluding for
     purposes of this clause (2) any such consolidated interest included therein
     that is attributable to Indebtedness of a Person that is not a Restricted
     Subsidiary); plus

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          (3) any interest expense on Indebtedness of another Person that is
     guaranteed by such Person or one of its Restricted Subsidiaries or secured
     by a Lien on assets of such Person or one of its Restricted Subsidiaries,
     whether or not such guarantee or Lien is called upon, provided that this
     clause (3) excludes interest on "claw-back", "make-well" or "keep-well"
     payments made by Leviathan or any Restricted Subsidiary; plus

          (4) the product of (a) all dividend payments, whether or not in cash,
     on any series of Disqualified Equity of such Person or any of its
     Restricted Subsidiaries, other than dividend payments on Equity Interests
     payable solely in Equity Interests of Leviathan (other than Disqualified
     Equity) or to Leviathan or a Restricted Subsidiary of Leviathan, times (b)
     a fraction, the numerator of which is one and the denominator of which is
     one minus the then current combined federal, state and local statutory tax
     rate of such Person, expressed as a decimal, in each case, on a
     consolidated basis and in accordance with GAAP; less

(B) to the extent included in (A) above, amortization or write-off of deferred
financing costs of such Person and its Restricted Subsidiaries during such
period and any charge related to, or any premium or penalty paid in connection
with, incurring any such Indebtedness of such Person and its Restricted
Subsidiaries prior to its Stated Maturity.

In the case of both (A) and (B), such amounts will be determined after
elimination of intercompany accounts among such Person and its Restricted
Subsidiaries and in accordance with GAAP.

     "Fixed Charge Coverage Ratio" means, with respect to any specified Person
for any period, the ratio of the Consolidated Cash Flow of such Person and its
Restricted Subsidiaries for such period to the Fixed Charges of such Person for
such period. In the event that the specified Person or any of its Restricted
Subsidiaries incurs, assumes, guarantees, repays or redeems any Indebtedness
(other than revolving credit borrowings not constituting a permanent commitment
reduction) or issues or redeems Disqualified Equity subsequent to the
commencement of the period for which the Fixed Charge Coverage Ratio is being
calculated but prior to the date on which the event for which the calculation of
the Fixed Charge Coverage Ratio is made (the "Calculation Date"), then the Fixed
Charge Coverage Ratio shall be calculated giving pro forma effect to such
incurrence (and the application of the net proceeds thereof), assumption,
guarantee, repayment or redemption of Indebtedness, or such issuance or
redemption of Disqualified Equity, as if the same had occurred at the beginning
of the applicable four-quarter reference period (and if such Indebtedness is
incurred to finance the acquisition of assets (including, without limitation, a
single asset, a division or segment or an entire company) that were conducting
commercial operations prior to such acquisition, there shall be included pro
forma net income for such assets, as if such assets had been acquired on the
first day of such period).

     In addition, for purposes of calculating the Fixed Charge Coverage Ratio:

          (1) acquisitions that have been made by the specified Person or any of
     its Restricted Subsidiaries, including through mergers or consolidations
     and including any related financing transactions, during the four-quarter
     reference period or subsequent to such reference period and on or prior to
     the Calculation Date shall be deemed to have occurred on the first day of
     the four-quarter reference period and Consolidated Cash Flow for such
     reference period shall be calculated without giving effect to clause (4) of
     the proviso set forth in the definition of Consolidated Net Income;

          (2) the Consolidated Cash Flow attributable to discontinued
     operations, as determined in accordance with GAAP, and operations or
     businesses disposed of prior to the Calculation Date, shall be excluded;

          (3) the Fixed Charges attributable to discontinued operations, as
     determined in accordance with GAAP, and operations or businesses disposed
     of prior to the Calculation Date, shall be excluded, but only to the extent
     that the obligations giving rise to such Fixed Charges will not be
     obligations of the specified Person or any of its Restricted Subsidiaries
     following the Calculation Date;

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          (4) interest on outstanding Indebtedness of the specified Person or
     any of its Restricted Subsidiaries as of the last day of the four-quarter
     reference period shall be deemed to have accrued at a fixed rate per annum
     equal to the rate of interest on such Indebtedness in effect on such last
     day after giving effect to any Hedging Obligation then in effect; and

          (5) if interest on any Indebtedness incurred by the specified Person
     or any of its Restricted Subsidiaries on such date may optionally be
     determined at an interest rate based upon a factor of a prime or similar
     rate, a eurocurrency interbank offered rate or other rates, then the
     interest rate in effect on the last day of the four-quarter reference
     period will be deemed to have been in effect during such period.

     "GAAP" means United States generally accepted accounting principles set
forth in the opinions and pronouncements of the Accounting Principles Board of
the American Institute of Certified Public Accountants and statements, and
pronouncements of the Financial Accounting Standards Board or in such other
statements by such other entity as have been approved by a significant segment
of the accounting profession, which are in effect from time to time.

     "guarantee" means a guarantee other than by endorsement of negotiable
instruments for collection in the ordinary course of business, direct or
indirect, in any manner including, without limitation, by way of a pledge of
assets, or through letters of credit or reimbursement, "claw-back," "make-well,"
or "keep-well" agreements in respect thereof, of all or any part of any
Indebtedness.

     "Hedging Obligations" means, with respect to any Person, the net
obligations (not the notional amount) of such Person under interest rate and
commodity price swap agreements, interest rate and commodity price cap
agreements, interest rate and commodity price collar agreements and foreign
currency and commodity price exchange agreements, options or futures contract or
other similar agreements or arrangements or hydrocarbon hedge contract or
forward sale contract, in each case designed to protect such Person against
fluctuations in interest rates, of foreign exchange rates, or commodity prices.

     "Indebtedness" means, with respect to any specified Person, any
indebtedness of such Person, whether or not contingent, in respect of:

          (1) borrowed money;

          (2) evidenced by bonds, notes, debentures or similar instruments or
     letters of credit (or reimbursement agreements in respect thereof), other
     than standby letters of credit and performance bonds issued by such Person
     in the ordinary course of business, to the extent not drawn;

          (3) banker's acceptances;

          (4) representing Capital Lease Obligations;

          (5) all Attributable Debt of such Person in respect of Sale and
     Lease-Back Transactions not involving a Capital Lease Obligation;

          (6) the balance deferred and unpaid of the purchase price of any
     property, except any such balance that constitutes an accrued expense or
     trade payable incurred in the ordinary course of business;

          (7) representing Disqualified Equity; or

          (8) representing any Hedging Obligations other than to (in the
     ordinary course of business and consistent with prior practice) hedge risk
     exposure in the operations, ownership of assets or the management of
     liabilities of Leviathan and its Restricted Subsidiaries;

if and to the extent any of the preceding items (other than letters of credit
and Hedging Obligations) would appear as a liability upon a balance sheet of the
specified Person prepared in accordance with GAAP. In addition, the term
"Indebtedness" includes all Indebtedness of others secured by a Lien on any
asset of the specified Person (whether or not such Indebtedness is assumed by
the specified Person) and,
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to the extent not otherwise included, the guarantee by such Person of any
indebtedness of any other Person, provided that a guarantee otherwise permitted
by the Indenture to be incurred by Leviathan or a Restricted Subsidiary of
Indebtedness incurred by Leviathan or a Restricted Subsidiary in compliance with
the terms of the Indenture shall not constitute a separate incurrence of
Indebtedness.

     The amount of any Indebtedness outstanding as of any date shall be:

          (1) the accreted value thereof, in the case of any Indebtedness issued
     with original issue discount; and

          (2) the principal amount thereof, together with any interest thereon
     that is more than 30 days past due, in the case of any other Indebtedness.

For purposes of clause (7) of the preceding paragraph, Disqualified Equity shall
be valued at the maximum fixed redemption, repayment or repurchase price, which
shall be calculated in accordance with the terms of such Disqualified Equity as
if such Disqualified Equity were repurchased on any date on which Indebtedness
shall be required to be determined pursuant to the Indenture; provided, however,
that if such Disqualified Equity is not then permitted by its terms to be
redeemed, repaid or repurchased, the redemption, repayment or repurchase price
shall be the book value of such Disqualified Equity. The amount of Indebtedness
of any Person at any date shall be the outstanding balance at such date of all
unconditional obligations as described above and the maximum liability of any
guarantees at such date; provided that for purposes of calculating the amount of
any non-interest bearing or other discount security, such Indebtedness shall be
deemed to be the principal amount thereof that would be shown on the balance
sheet of the issuer thereof dated such date prepared in accordance with GAAP,
but that such security shall be deemed to have been incurred only on the date of
the original issuance thereof. The amount of Indebtedness of any Person at any
date shall be the outstanding balance at such date of all unconditional
obligations as described above and the maximum liability, upon the occurrence of
the contingency giving rise to the obligation, of any contingent obligations at
such date.

     "Investments" means, with respect to any Person, all investments by such
Person in other Persons (including Affiliates) in the forms of direct or
indirect loans (including guarantees of Indebtedness or other obligations),
advances (other than advances to customers in the ordinary course of business
that are recorded as accounts receivable on the balance sheet of the lender and
commission, moving, travel and similar advances to officers and employees made
in the ordinary course of business) or capital contributions, purchases or other
acquisitions for consideration of Indebtedness, Equity Interests or other
securities, together with all items that are or would be classified as
investments on a balance sheet prepared in accordance with GAAP. For purposes of
the definition of "Unrestricted Subsidiary," the definition of "Restricted
Payment" and the covenant described under the "Limitation on Restricted
Payments" covenant (i) "Investment" shall include the portion (proportionate to
Leviathan's Equity Interest in such Subsidiary) of the fair market value of the
net assets of any Subsidiary of Leviathan or any of its Restricted Subsidiaries
at the time that such Subsidiary is designated an Unrestricted Subsidiary;
provided, however, that upon a redesignation of such Subsidiary as a Restricted
Subsidiary, Leviathan or such Restricted Subsidiary shall be deemed to continue
to have a permanent "Investment" in such Subsidiary at the time immediately
before the effectiveness of such redesignation less (y) the portion
(proportionate to Leviathan's or such Restricted Subsidiary's Equity Interest in
such Subsidiary) of the fair market value of the net assets of such Subsidiary
at the time of such redesignation, and (ii) any property transferred to or from
an Unrestricted Subsidiary shall be valued at its fair market value at the time
of such transfer, in each case as determined in good faith by the Board of
Directors of the General Partner. If Leviathan or any Restricted Subsidiary of
Leviathan sells or otherwise disposes of any Equity Interests of any direct or
indirect Restricted Subsidiary of Leviathan such that, after giving effect to
any such sale or disposition, such Person is no longer a Restricted Subsidiary
of Leviathan, Leviathan shall be deemed to have made an Investment on the date
of any such sale or disposition equal to the fair market value of the Equity
Interests of such Restricted Subsidiary not sold or disposed of in an amount
determined as provided in the final paragraph of the covenant described above
under the caption "-- Restricted Payments."

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     "Leviathan Credit Facility" means the Third Amended and Restated Credit
Agreement to be entered into among Leviathan, Leviathan Finance, the lenders
from time to time party thereto and The Chase Manhattan Bank, as administrative
agent, including any deferrals, renewals, extensions, replacements, refinancings
or refundings thereof, and any amendments, modifications or supplements thereto
and any agreement providing therefor (including any restatement thereof and any
increases in the amount of commitments thereunder), whether by or with the same
or any other lenders, creditors, group of lenders or group of creditors and
including related notes, guarantees, collateral security documents and other
instruments and agreements executed in connection therewith.

     "Lien" means, with respect to any asset, any mortgage, lien (statutory or
otherwise), pledge, charge, security interest, hypothecation, assignment for
security, claim, preference, priority or encumbrance of any kind in respect of
such asset, whether or not filed, recorded or otherwise perfected under
applicable law, including any conditional sale or other title retention
agreement or any lease in the nature thereof, any option or other agreement to
grant a security interest in and any filing of or agreement to give any
financing statement under the Uniform Commercial Code (or equivalent statute) of
any jurisdiction.

     "Liquidated Damages" means all liquidated damages then owing pursuant to
the Registration Rights Agreement.

     "Net Income" means, with respect to any Person, the consolidated net income
(loss) of such Person and its Restricted Subsidiaries, determined in accordance
with GAAP and before any reduction in respect of preferred stock dividends,
excluding, however:

          (1) the aggregate gain (but not loss in excess of such aggregate
     gain), together with any related provision for taxes on such gain, realized
     in connection with:

             (a) any Asset Sale; or

             (b) the disposition of any securities by such Person or any of its
        Restricted Subsidiaries or the extinguishment of any Indebtedness of
        such Person or any of its Restricted Subsidiaries; and

          (2) the aggregate extraordinary gain (but not loss in excess of such
     aggregate extraordinary gain), together with any related provision for
     taxes on such aggregate extraordinary gain (but not loss in excess of such
     aggregate extraordinary gain).

     "Net Proceeds" means, with respect to any Asset Sale or sale of Equity
Interests, the aggregate proceeds received by Leviathan or any of its Restricted
Subsidiaries in cash or Cash Equivalents in respect of any Asset Sale or sale of
Equity Interests (including, without limitation, any cash received upon the sale
or other disposition of any non-cash consideration received in any such sale),
net of, without duplication, (i) the direct costs relating to such Asset Sale or
sale of Equity Interests, including, without limitation, brokerage commissions
and legal, accounting and investment banking fees, sales commissions, recording
fees, title transfer fees, and any relocation expenses incurred as a result
thereof, (ii) taxes paid or payable as a result thereof, in each case after
taking into account any available tax credits or deductions and any tax sharing
arrangements and amounts required to be applied to the repayment of Indebtedness
secured by a Lien on the asset or assets that were the subject of such Asset
Sale or sale of Equity Interests, (iii) all distributions and payments required
to be made to minority interest holders in Restricted Subsidiaries as a result
of such Asset Sale and (iv) any amounts to be set aside in any reserve
established in accordance with GAAP or any amount placed in escrow, in either
case for adjustment in respect of the sale price of such asset or assets or for
liabilities associated with such Asset Sale or sale of Equity Interests and
retained by Leviathan or any of its Restricted Subsidiaries until such time as
such reserve is reversed or such escrow arrangement is terminated, in which case
Net Proceeds shall include only the amount of the reserve so reversed or the
amount returned to Leviathan or its Restricted Subsidiaries from such escrow
arrangement, as the case may be.

     "Non-Recourse Debt" means Indebtedness as to which:

          (1) neither Leviathan nor any of its Restricted Subsidiaries (a)
     provides credit support of any kind (including any undertaking, agreement
     or instrument that would constitute Indebtedness), (b) is

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<PAGE>   128

     directly or indirectly liable as a guarantor or otherwise, or (c)
     constitutes the lender of such Indebtedness;

          (2) no default with respect to which (including any rights that the
     holders thereof may have to take enforcement action against an Unrestricted
     Subsidiary) would permit upon notice, lapse of time or both any holder of
     any other Indebtedness (other than the notes) of Leviathan or any of its
     Restricted Subsidiaries to declare a default on such other Indebtedness or
     cause the payment thereof to be accelerated or payable prior to its stated
     maturity; and

          (3) the lenders have been notified in writing that they will not have
     any recourse to the stock or assets of Leviathan or any of its Restricted
     Subsidiaries;

provided that in no event shall Indebtedness of any Person which is not a
Restricted Subsidiary fail to be Non-Recourse Debt solely as a result of any
default provisions contained in a guarantee thereof by Leviathan or any of its
Restricted Subsidiaries provided that Leviathan or such Restricted Subsidiary
was otherwise permitted to incur such guarantee pursuant to the Indenture.

     "Obligations" means any principal, interest, penalties, fees,
indemnifications, reimbursement obligations, damages and other liabilities
payable under the documentation governing any Indebtedness.

     "Partnership Agreement" means the Amended and Restated Agreement of Limited
Partnership of Leviathan Gas Pipeline Partners, L.P., dated as of February 19,
1993, as such may be amended, modified or supplemented from time to time.

     "Permitted Business" means (1) gathering, transporting (by barge, pipeline,
ship, truck or other modes of hydrocarbon transportation), terminalling,
storing, producing, acquiring, developing, exploring for, processing,
dehydrating and otherwise handling hydrocarbons, including, without limitation,
constructing pipeline, platform, dehydration, processing and other
energy-related facilities, and activities or services reasonably related or
ancillary thereto, and (2) any other business that does not constitute a
reportable segment (as determined in accordance with GAAP) for Leviathan's
annual audited consolidated financial statements.

     "Permitted Business Investments" means Investments by Leviathan or any of
its Restricted Subsidiaries in any Unrestricted Subsidiary of Leviathan or in
any Person that does not constitute a direct or indirect Subsidiary of Leviathan
(a "Joint Venture"), provided that

          (1) either (a) at the time of such Investment and immediately
     thereafter, Leviathan could incur $1.00 of additional Indebtedness under
     the first paragraph in the limitation of indebtedness set forth under the
     caption "-- Incurrence of Indebtedness and Issuance of Disqualified Equity"
     above or (b) such Investment is made with the proceeds of Incremental
     Funds;

          (2) if such Unrestricted Subsidiary or Joint Venture has outstanding
     Indebtedness at the time of such Investment, either (a) all such
     Indebtedness is non-recourse to Leviathan and its Restricted Subsidiaries
     or (b) any such Indebtedness of such Unrestricted Subsidiary or Joint
     Venture that is recourse to Leviathan or any of its Restricted Subsidiaries
     (which shall include all Indebtedness of such Unrestricted Subsidiary or
     Joint Venture for which Leviathan or any of its Restricted Subsidiaries may
     be directly or indirectly, contingently or otherwise, obligated to pay,
     whether pursuant to the terms of such Indebtedness, by law or pursuant to
     any guaranty or "claw-back", "make-well" or "keep-well" arrangement) could,
     at the time such Investment is made and, if later, at the time any such
     Indebtedness is incurred, be incurred by Leviathan and its Restricted
     Subsidiaries in accordance with the limitation on indebtedness set forth in
     the first paragraph under the caption "-- Incurrence of Indebtedness and
     Issuance of Disqualified Equity" above; and

          (3) such Unrestricted Subsidiary's or Joint Venture's activities are
     not outside the scope of the Permitted Business.

     The term "Joint Venture" shall include Western Gulf Holdings, L.L.C.
("Western Gulf") and its Subsidiaries (including High Island Offshore System,
L.L.C. ("HIOS") and U-T Offshore System

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<PAGE>   129

("UTOS") and its Subsidiaries), and no such Person shall constitute a Restricted
Subsidiary for purposes of the Indenture (even if such Person is then a
Subsidiary of Leviathan), until such time as the Board of Directors of the
General Partner designates, in a manner consistent with the designation of an
Unrestricted Subsidiary as a Restricted Subsidiary or a Restricted Subsidiary as
an Unrestricted Subsidiary, each as described under "Certain
Covenants-Designation of Restricted and Unrestricted Subsidiaries," Western Gulf
or UTOS, including one or more of its Subsidiaries, as the case may be, as a
Restricted Subsidiary or an Unrestricted Subsidiary.

     "Permitted Investments" means:

          (1) any Investment in, or that results in the creation of, any
     Restricted Subsidiary of Leviathan;

          (2) any Investment in Leviathan or in a Restricted Subsidiary of
     Leviathan (excluding redemptions, purchases, acquisitions or other
     retirements of Equity Interests in Leviathan) at any one time outstanding;

          (3) any Investment in cash or Cash Equivalents;

          (4) any Investment by Leviathan or any Restricted Subsidiary of
     Leviathan in a Person if as a result of such Investment:

             (a) such Person becomes a Restricted Subsidiary of Leviathan; or

             (b) such Person is merged, consolidated or amalgamated with or
        into, or transfers or conveys substantially all of its assets to, or is
        liquidated into, Leviathan or a Restricted Subsidiary of Leviathan;

          (5) any Investment made as a result of the receipt of consideration
     consisting of other than cash or Cash Equivalents from an Asset Sale that
     was made pursuant to and in compliance with the covenant described above
     under the caption "-- Repurchase at the Option of Holders -- Asset Sales;"

          (6) any acquisition of assets solely in exchange for the issuance of
     Equity Interests (other than Disqualified Equity) of Leviathan;

          (7) payroll advances in the ordinary course of business and other
     advances and loans to officers and employees of Leviathan or any of its
     Restricted Subsidiaries, so long as the aggregate principal amount of such
     advances and loans does not exceed $1.0 million at any one time
     outstanding;

          (8) Investments in stock, obligations or securities received in
     settlement of debts owing to Leviathan or any of its Restricted
     Subsidiaries as a result of bankruptcy or insolvency proceedings or upon
     the foreclosure, perfection or enforcement of any Lien in favor of
     Leviathan or any such Restricted Subsidiary, in each case as to debt owing
     to Leviathan or any of its Restricted Subsidiary that arose in the ordinary
     course of business of Leviathan or any such Restricted Subsidiary;

          (9) any Investment in Hedging Obligations;

          (10) any Investments in prepaid expenses, negotiable instruments held
     for collection and lease, utility, workers' compensation and performance
     and other similar deposits and prepaid expenses made in the ordinary course
     of business;

          (11) any Investments required to be made pursuant to any agreement or
     obligation of Leviathan or any Restricted Subsidiary in effect on the Issue
     Date and listed on a schedule to the Indenture; and

          (12) other Investments in any Person engaged in a Permitted Business
     (other than an Investment in an Unrestricted Subsidiary) having an
     aggregate fair market value (measured on the date each such Investment was
     made and without giving effect to subsequent changes in value), when taken
     together with all other Investments made pursuant to this clause (12) since
     the date of the Indenture and existing at the time the Investment, which is
     the subject of the determination, was made, not to exceed $5.0 million.

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<PAGE>   130

     "Permitted Junior Securities" means: (1) nonmandatorily redeemable Equity
Interests in Leviathan or any Subsidiary Guarantor, as reorganized or
readjusted; or (2) debt securities of Leviathan or any Subsidiary Guarantor as
reorganized or readjusted that are subordinated to all Senior Debt and any debt
securities issued in exchange for Senior Debt to substantially the same extent
as, or to a greater extent than, the notes and the Guarantees are subordinated
to Senior Debt pursuant to the Indenture, provided that the rights of the
holders of Senior Debt under the Leviathan Credit Agreement are not altered or
impaired by such reorganization or readjustment.

     "Permitted Liens" means:

          (1) Liens on the assets of Leviathan and any Subsidiary securing
     Senior Debt;

          (2) easements, rights-of-way, restrictions, minor defects and
     irregularities in title and other similar charges or encumbrances not
     interfering in any material respect with the business of Leviathan or its
     Restricted Subsidiaries;

          (3) Liens securing reimbursement obligations of Leviathan or a
     Restricted Subsidiary with respect to letters of credit encumbering only
     documents and other property relating to such letters of credit and the
     products and proceeds thereof;

          (4) Liens encumbering deposits made to secure obligations arising from
     statutory, regulatory, contractual or warranty requirements of Leviathan
     and its Restricted Subsidiaries;

          (5) Liens in favor of Leviathan or any of the Restricted Subsidiaries;

          (6) any interest or title of a lessor in the property subject to a
     Capital Lease Obligation;

          (7) Liens on property of a Person existing at the time such Person is
     merged with or into or consolidated with Leviathan or any Restricted
     Subsidiary of Leviathan, provided that such Liens were in existence prior
     to the contemplation of such merger or consolidation and do not extend to
     any assets other than those of the Person merged into or consolidated with
     Leviathan or such Restricted Subsidiary;

          (8) Liens on property existing at the time of acquisition thereof by
     Leviathan or any Restricted Subsidiary of Leviathan, provided that such
     Liens were in existence prior to the contemplation of such acquisition and
     relate solely to such property, accessions thereto and the proceeds
     thereof;

          (9) Liens to secure the performance of tenders, bids, leases,
     statutory obligations, surety or appeal bonds, government contracts,
     performance bonds or other obligations of a like nature incurred in the
     ordinary course of business;

          (10) Liens on any property or asset acquired, constructed or improved
     by Leviathan or any Restricted Subsidiary (a "Purchase Money Lien"), which
     (A) are in favor of the seller of such property or assets, in favor of the
     Person constructing or improving such asset or property, or in favor of the
     Person that provided the funding for the acquisition, construction or
     improvement of such asset or property, (B) are created within 360 days
     after the date of acquisition, construction or improvement, (C) secure the
     purchase price or construction or improvement cost, as the case may be, of
     such asset or property in an amount up to 100% of the fair market value (as
     determined by the Board of Directors of the General Partner) of such
     acquisition, construction or improvement of such asset or property, and (D)
     are limited to the asset or property so acquired, constructed or improved
     (other than proceeds thereof, accessions thereto and upgrades thereof);

          (11) Liens to secure performance of Hedging Obligations of Leviathan
     or a Restricted Subsidiary;

          (12) Liens existing on the date of the Indenture and Liens on any
     extensions, refinancing, renewal, replacement or defeasance of any
     Indebtedness or other obligation secured thereby;

          (13) Liens on and pledges of the Equity Interests of any Unrestricted
     Subsidiary or any Joint Venture owned by Leviathan or any Restricted
     Subsidiary to the extent securing Non-Recourse Debt
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<PAGE>   131

     or Indebtedness (other than Permitted Debt) otherwise permitted by the
     first paragraph under "-- Incurrence of Indebtedness and Issuance of
     Disqualified Equity;"

          (14) statutory Liens of landlords and warehousemen's, carriers',
     mechanics', suppliers', materialman's, repairmen's, or other like Liens
     (including contractual landlord's liens) arising in the ordinary course of
     business and with respect to amounts not yet delinquent or being contested
     in good faith by appropriate proceedings, if a reserve or appropriate
     provision, if any, as shall be required in conformity with GAAP shall have
     been made therefor;

          (15) Liens incurred or deposits made in the ordinary course of
     business in connection with workers' compensation, unemployment insurance
     and other similar types of social security, old age pension or public
     liability obligations;

          (16) Liens on pipelines or pipeline facilities that arise by operation
     of law;

          (17) Liens arising under operating agreements, joint venture
     agreements, partnership agreements, oil and gas leases, farm out
     agreements, division orders, contracts for sale, transportation or exchange
     of oil and natural gas, unitization and pooling declarations and
     agreements, area of mutual interest agreements and other agreements arising
     in the ordinary course of Leviathan's or any Restricted Subsidiary's
     business that are customary in the Permitted Business;

          (18) judgment and attachment Liens not giving rise to a Default or
     Event of Default;

          (19) Liens securing the Obligations of the issuers under the notes and
     the indenture and of the Subsidiary Guarantors under the Guarantees;

          (20) Liens for taxes, assessments or governmental charges or claims
     that are not yet delinquent or that are being contested in good faith by
     appropriate proceedings promptly instituted and diligently concluded,
     provided that any reserve or other appropriate provision as shall be
     required in conformity with GAAP shall have been made therefor;

          (21) Liens arising from protective filings made in the appropriate
     office(s) for the filing of a financing statement in the applicable
     jurisdiction(s) in connection with any lease, consignment or similar
     transaction otherwise permitted hereby, which filings are made for the
     purpose of perfecting the interest of the secured party in the relevant
     items, if the transaction were subsequently classified as a sale secured
     lending arrangement;

          (22) Liens arising out of consignment or similar arrangements for sale
     of goods;

          (23) Liens upon specific items of inventory or other goods and
     proceeds of any Person securing such Person's obligations in respect of
     bankers' acceptances issued or created for the account of such Person to
     facilitate the purchase, shipment or storage of such inventory or other
     goods;

          (24) Liens securing any Indebtedness which includes a covenant that
     limits liens in a manner substantially similar to the covenant entitled
     "Liens;" and

          (25) Liens incurred in the ordinary course of business of Leviathan or
     any Restricted Subsidiary of Leviathan with respect to obligations that do
     not exceed $5.0 million at any one time outstanding.

     "Permitted Refinancing Indebtedness" means any Indebtedness of Leviathan or
any of its Restricted Subsidiaries issued in exchange for, or the net proceeds
of which are used to extend, refinance, renew, replace, defease or refund other
Indebtedness of Leviathan or any of its Restricted Subsidiaries (other than
intercompany Indebtedness); provided that:

          (1) the principal amount (or accreted value, if applicable) of such
     Permitted Refinancing Indebtedness does not exceed the principal amount of
     (or accreted value, if applicable), plus accrued interest on the
     Indebtedness so extended, refinanced, renewed, replaced, defeased or
     refunded (plus the amount of necessary fees and expenses incurred in
     connection therewith and any premiums paid on the Indebtedness refinanced);

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<PAGE>   132

          (2) such Permitted Refinancing Indebtedness has a final maturity date
     no earlier than the final maturity date of, and has a Weighted Average Life
     to Maturity equal to or greater than the Weighted Average Life to Maturity
     of, the Indebtedness being extended, refinanced, renewed, replaced,
     defeased or refunded;

          (3) if the Indebtedness being extended, refinanced, renewed, replaced,
     defeased or refunded is subordinated in right of payment to the notes or
     the Guarantees, such Permitted Refinancing Indebtedness has a final
     maturity date later than the final maturity date of, and is subordinated in
     right of payment to, the notes or the Guarantees, as the case may be, on
     terms at least as favorable to the holders of notes as those contained in
     the documentation governing the Indebtedness being extended, refinanced,
     renewed, replaced, defeased or refunded; and

          (4) such Indebtedness is incurred either by Leviathan or by the
     Restricted Subsidiary who is the obligor on the Indebtedness being
     extended, refinanced, renewed, replaced, defeased or refunded.

     "Restricted Investment" means an Investment other than a Permitted
Investment or a Permitted Business Investment.

     "Restricted Subsidiary" of a Person means any Subsidiary of the referenced
Person that is not an Unrestricted Subsidiary, provided that UTOS, Western Gulf
and their Subsidiaries (including HIOS) shall not constitute a Restricted
Subsidiary of Leviathan, even if such Person is then a Subsidiary of Leviathan,
until such time as either such entity becomes a Restricted Subsidiary in the
manner provided in the final paragraph under the definition of "Permitted
Business Investments" above. Notwithstanding anything in the Indenture to the
contrary, Leviathan Finance shall be designated as a Restricted Subsidiary of
Leviathan.

     "Senior Debt" means:

          (1) all Indebtedness outstanding under Credit Facilities and all
     Hedging Obligations with respect thereto;

          (2) any other Indebtedness permitted to be incurred by Leviathan and
     the Restricted Subsidiaries under the terms of the Indenture, unless the
     instrument under which such Indebtedness is incurred expressly provides
     that it is on a parity with or subordinated in right of payment to the
     notes; and

          (3) all Obligations with respect to the items listed in the preceding
     clauses (1) and (2).

     Notwithstanding anything to the contrary in the preceding, Senior Debt will
not include:

          (1) any Indebtedness that is expressly subordinate or junior in right
     of payment to any Indebtedness of Leviathan or any Subsidiary Guarantor;

          (2) Indebtedness evidenced by the notes or the Guarantees;

          (3) any liability for federal, state, local or other taxes owed or
     owing by Leviathan or any Subsidiary Guarantor;

          (4) any Indebtedness of Leviathan or any of its Subsidiaries to any of
     its Subsidiaries or other Affiliates;

          (5) any trade payables; or

          (6) any Indebtedness that is incurred in violation of the Indenture.

     "Significant Subsidiary" means any Subsidiary that would be a "significant
subsidiary" as defined in Article 1, Rule 1-02 of Regulation S-X, promulgated
pursuant to the Securities Act and the Exchange Act, as such Regulation is in
effect on the date hereof.

     "Stated Maturity" means, with respect to any installment of interest or
principal on any series of Indebtedness, the date on which such payment of
interest or principal was scheduled to be paid in the

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original documentation governing such Indebtedness, and shall not include any
contingent obligations to repay, redeem or repurchase any such interest or
principal prior to the date originally scheduled for the payment thereof

     "Subsidiary" means, with respect to any Person:

          (1) any corporation, association or other business entity of which
     more than 50% of the Voting Stock is at the time owned or controlled,
     directly or indirectly, by such Person or one or more of the other
     Subsidiaries of that Person (or a combination thereof); and

          (2) any partnership (whether general or limited), limited liability
     company or joint venture (a) the sole general partner or the managing
     general partner or managing member of which is such Person or a Subsidiary
     of such Person, or (b) if there are more than a single general partner or
     member, either (i) the only general partners or managing members of which
     are such Person and/or one or more Subsidiaries of such Person (or any
     combination thereof) or (ii) such Person owns or controls, directly or
     indirectly, a majority of the outstanding general partner interests, member
     interests or other Voting Stock of such partnership, limited liability
     company or joint venture, respectively;

     provided, however, that each of Western Gulf and its Subsidiaries
     (including HIOS and East Breaks) shall be deemed not to be a Subsidiary of
     Leviathan or any of its Subsidiaries unless, and to the extent, any of
     Western Gulf or any of its Subsidiaries is redesignated as a Subsidiary of
     Leviathan in accordance with the terms of the Indenture.

     "Subsidiary Guarantors" means each of:


          (1) Delos Offshore Company, L.L.C.; Ewing Bank Gathering Company,
     L.L.C.; Flextrend Development Company, L.L.C.; Green Canyon Pipe Line
     Company, L.L.C.; Leviathan Oil Transport Systems, L.L.C.; Leviathan
     Operating Company, L.L.C.; Manta Ray Gathering Company, L.L.C.; Moray
     Pipeline Company, L.L.C.; Natoco, L.L.C.; Poseidon Pipeline Company,
     L.L.C.; Sailfish Pipeline Company, L.L.C.; Stingray Holding, L.L.C.; Tarpon
     Transmission Company; Transco Hydrocarbons Company, L.L.C.; Texam Offshore
     Gas Transmission, L.L.C.; Transco Offshore Pipeline Company, L.L.C.; UTOS
     Holding, L.L.C.; VK Deepwater Gathering Company, L.L.C.; VK-Main Pass
     Gathering Company, L.L.C.; and, as a result of the acquisition from El Paso
     Energy of an additional interest in Viosca Knoll Gathering Company as
     described in this prospectus, Viosca Knoll Gathering Company; and


          (2) any other Subsidiary that executes a Guarantee in accordance with
     the provisions of the Indenture; and

          (3) their respective successors and assigns.

Notwithstanding anything in the Indenture to the contrary, Leviathan Finance
shall not be a Subsidiary Guarantor.

     "U.S. Government Obligations" means securities that are (i) direct
obligations of the United States of America for the payment of which its full
faith and credit is pledged; (ii) obligations of a Person controlled or
supervised by and acting as an agency or instrumentality of the United States of
America the payment of which is unconditionally guaranteed as a full faith and
credit obligation by the United States of America, which, in either case under
clauses (i) or (ii) above, are not callable or redeemable at the option of the
issuers thereof: or (iii) depository receipts issued by a bank or trust company
as custodian with respect to any such U.S. Government Obligations or a specific
payment of interest on or principal of any such U.S. Government Obligation held
by such custodian for the account of the holder of a Depository receipt,
provided that (except as required by law) such custodian is not authorized to
make any deduction from the amount payable to the holder of such Depository
receipt from any amount received by the custodian in respect of the U.S.
Government Obligation evidenced by such Depository receipt.

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     "Unrestricted Subsidiary" means any Subsidiary of Leviathan (other than
Leviathan Finance) that is designated by the Board of Directors of the General
Partner as an Unrestricted Subsidiary pursuant to a Board Resolution, provided
that, at the time of such designation, (x) no portion of the Indebtedness or
other obligation of such Subsidiary (whether contingent or otherwise and whether
pursuant to the terms of such Indebtedness or the terms governing the
organization of such Subsidiary or by law (a) is guaranteed by Leviathan or any
other Restricted Subsidiary, (B) is recourse to or obligates Leviathan or any
Restricted Subsidiary in any way (including any "claw-back," "keep-well,"
"make-well" or other agreements, arrangements or understandings to maintain the
financial performance or results of operations of such Subsidiary or to
otherwise infuse or contribute cash to such Subsidiary). or (C) subjects any
property or assets of Leviathan or any Restricted Subsidiary, directly or
indirectly, contingently or otherwise, to the satisfaction of such Indebtedness,
unless such Investment or Indebtedness is permitted by the provisions of the
Indenture described above under the captions "-- Restricted Payments" and
"-- Incurrence of Indebtedness and Issuance of Disqualified Equity," (y) no
Equity Interests of a Restricted Subsidiary are held by such Subsidiary,
directly or indirectly, and (z) the amount of Leviathan's Investment, as
determined at the time of such designation, in such Subsidiary since the Issue
Date to the date of designation is treated as of the date of such designation as
a Restricted Investment, Permitted Investment or Permitted Business Investment,
as applicable.

     Any designation of a Subsidiary of Leviathan as an Unrestricted Subsidiary
shall be evidenced to the Trustee by filing with the Trustee a certified copy of
the resolutions of the Board of Directors of the General Partner giving effect
to such designation and an Officers' Certificate certifying that such
designation compiled with the preceding conditions and was permitted by the
covenant described above under the caption "--Certain Covenants-Restricted
Payments." If, at any time, any Unrestricted Subsidiary would fail to meet the
preceding requirements as an Unrestricted Subsidiary, it shall thereafter cease
to be an Unrestricted Subsidiary for purposes of the Indenture and any
Indebtedness of such Subsidiary shall be deemed to be incurred by a Restricted
Subsidiary of Leviathan as of such date and, if such Indebtedness is not
permitted to be incurred as of such date under the covenant described under the
caption "Incurrence of Indebtedness and Issuance of Preferred Stock," Leviathan
shall be in default of such covenant. The Board of Directors of the General
Partner may at any time designate any Unrestricted Subsidiary to be a Restricted
Subsidiary; provided that such designation shall be deemed to be an incurrence
of Indebtedness by a Restricted Subsidiary of Leviathan of any outstanding
Indebtedness of such Unrestricted Subsidiary and such designation shall only be
permitted if (1) such Indebtedness is permitted under the covenant described
under the caption "-- Certain Covenants -- Incurrence of Indebtedness and
Issuance of Disqualified Equity," calculated on a pro forma basis as if such
designation had occurred at the beginning of the four-quarter reference period;
and (2) no Default or Event of Default would be in existence following such
designation.

     "Voting Stock" of any Person as of any date means the Equity Interests of
such Person pursuant to which the holders thereof have the general voting power
under ordinary circumstances to elect at least a majority of the board of
directors, managers, general partners or trustees of any Person (irrespective of
whether or not, at the time, Equity Interests of any other class or classes
shall have, or might have, voting power by reason of the occurrence of any
contingency) or, with respect to a partnership (whether general or limited), any
general partner interest in such partnership.

     "Weighted Average Life to Maturity" means, when applied to any Indebtedness
at any date, the number of years obtained by dividing:

          (1) the sum of the products obtained by multiplying (a) the amount of
     each then remaining installment, sinking fund, serial maturity or other
     required payments of principal, including payment at final maturity, in
     respect thereof, by (b) the number of years (calculated to the nearest
     one-twelfth) that will elapse between such date and the making of such
     payment; by

          (2) the then outstanding principal amount of such Indebtedness.

     "Wholly Owned Restricted Subsidiary" means any Restricted Subsidiary of
which all of the outstanding Equity Interests (other than directors' qualifying
shares, if any, or other ownership interests required by applicable law to be
held by third parties) shall at the time be owned by Leviathan and its
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Restricted Subsidiaries; provided that up to 1.0101% of such Person may be owned
by the General Partner.

                       SERIES A NOTES REGISTRATION RIGHTS


     The issuers, the subsidiary guarantors and the initial purchasers entered
into the Registration Rights Agreement on May 27, 1999. In the Registration
Rights Agreement, the issuers and subsidiary guarantors agreed to file the
exchange offer registration statement with the SEC within 60 days after the
closing date, and use their respective best efforts to have it declared
effective at the earliest possible time, but in no event later than 150 days
after the closing date. The issuers and the subsidiary guarantors also agreed to
use their best efforts to cause the exchange offer registration statement to be
effective continuously, to keep the exchange offer open for a period of not less
than 20 business days and cause the exchange offer to be consummated no later
than the 30th business day after it is declared effective by the SEC. The
Registration Rights Agreement provides the following. Pursuant to the exchange
offer, certain holders of notes which constitute Transfer Restricted Securities
(defined below) may exchange their Transfer Restricted Securities for Series B
notes, which will be registered and will contain terms substantially identical
in all material respects to the Series A notes. To participate in the exchange
offer, each holder must represent that it is not an affiliate of Leviathan, that
it is not engaged in, and does not intend to engage in, and has no arrangement
or understanding with any person to participate in, a distribution of the Series
B notes, that it is acquiring the Series B notes in the Exchange Offer in its
ordinary course of business, and that it is not a broker-dealer who is receiving
Series B notes in exchange for Series A notes that it acquired as a result of
market-making or other trading activities or, if it is such a person, that it
will comply with the registration and prospectus delivery requirements of the
Securities Act to the extent applicable.



     If (i) the exchange offer is not permitted by applicable law or SEC policy
or (ii) any holder of notes which are Transfer Restricted Securities notifies
Leviathan prior to the 20th business day following the consummation of the
exchange offer that (a) it is prohibited by law or SEC policy from participating
in the exchange offer, (b) it may not resell the Series B notes acquired by it
in the exchange offer to the public without delivering a prospectus, and the
prospectus contained in the exchange offer registration statement is not
appropriate or available for such resales by it, or (c) it is a broker-dealer
and holds notes acquired directly from Leviathan or any of Leviathan's
affiliates, the issuers and the subsidiary guarantors will file with the SEC a
shelf registration statement to register for public resale the Transfer
Restricted Securities held by any such holder who provides Leviathan with
certain information for inclusion in the shelf registration statement.



     For the purposes of the Registration Rights Agreement, "Transfer Restricted
Securities" means each Series A note or Series B note until the earliest of the
date of which (i) such Series A note is exchanged in the exchange offer and
entitled to be resold to the public by the holder thereof without complying with
the prospectus delivery requirements of the Securities Act, (ii) such Series A
note or Series B note has been disposed of in accordance with the shelf
registration statement, (iii) such Series B note is disposed of by a
broker-dealer pursuant to the "Plan of Distribution" beginning on page 142
contemplated by the exchange offer registration statement (including delivery of
the prospectus contained therein) or (iv) such Series A note or Series B note is
distributed to the public pursuant to Rule 144 under the Securities Act.



     The Registration Rights Agreement provides that (1) if the issuers and the
subsidiary guarantors fail to file an exchange offer registration statement with
the SEC on or prior to the 60th day after the closing date, (2) if the exchange
offer registration statement is not declared effective by the SEC on or prior to
the 150th day after the closing date, (3) if the exchange offer is not
consummated on or before the 30th business day after the exchange offer
registration statement is declared effective, (4) if obligated to file the shelf
registration statement and the issuers and the subsidiary guarantors fail to
file the shelf registration statement with the SEC on or prior to the 60th day
after such filing obligation arises, (5) if obligated to file a shelf
registration statement and the shelf registration statement is not declared
effective on or prior to the 150th day after the obligation to file a shelf
registration statement arises, or (6) subject to certain


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<PAGE>   136


conditions, if the exchange offer registration statement or the shelf
registration statement, as the case may be, is declared effective but thereafter
ceases to be effective or useable in connection with resales of the Transfer
Restricted Securities, for such time of non-effectiveness or non-usability
(each, a "Registration Default"), the issuers and the subsidiary guarantors
agree to pay to each holder of Transfer Restricted Securities affected thereby
liquidated damages ("Liquidated Damages") in an amount equal to $0.05 per week
per $1,000 in original principal amount of Transfer Restricted Securities held
by such holder for each week or portion thereof that the Registration Default
continues for the first 90 day period immediately following the occurrence of
such Registration Default. The amount of the Liquidated Damages shall increase
by an additional $0.05 per week per $1,000 in original principal amount of
Transfer Restricted Securities with respect to each subsequent 90 day period
until all Registration Defaults have been cured, up to a maximum amount of
Liquidated Damages of $0.50 per week per $1,000 in principal amount of Transfer
Restricted Securities. None of the issuers and the subsidiary guarantors shall
be required to pay Liquidated Damages for more than one Registration Default at
any given time. Upon curing all Registration Defaults, Liquidated Damages will
cease to accrue.



     All accrued Liquidated Damages shall be paid by the issuers and the
subsidiary guarantors to holders entitled thereto by wire transfer to the
accounts specified by them or by mailing checks to their registered address if
no such accounts have been specified.



     Holders of the Series A notes will be required to make certain
representations to the issuers (as described in the Registration Rights
Agreement) in order to participate in the exchange offer and will be required to
deliver information to be used in connection with the shelf registration
statement and to provide comments on the shelf registration statement within the
time periods set forth in the Registration Rights Agreement in order to have
their notes included in the shelf registration statement.



     If the issuers effect the registered exchange offer, the issuers will be
entitled to close the registered exchange offer 20 business days after the
commencement thereof; provided that the issuers have accepted all Series A notes
theretofore validly rendered in accordance with the terms of the exchange offer
and no brokers-dealers continue to hold any Series A notes.


     The summary herein of certain provisions of the Registration Rights
Agreement does not purport to be complete and is subject to, and is qualified in
its entirety by reference to, all the provisions of the Registration Rights
Agreement, a copy of which has been filed with the SEC and is available upon
request to Leviathan.

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<PAGE>   137

                       DESCRIPTION OF OTHER INDEBTEDNESS


SUBORDINATED NOTES



     We entered into an indenture dated May 27, 1999 with Chase Bank of Texas,
National Association, pursuant to which we issued $175 million in aggregate
principal amount of the subordinated notes. We capitalized $5.2 million of debt
issue costs related to the issuance of the subordinated notes. The subordinated
notes bear interest at a rate of 10 3/8% per annum, payable semi-annually, on
June 1 and December 1, mature on June 1, 2009 and are junior to substantially
all of our other indebtedness other than trade payables and indebtedness that by
its terms expressly states it is equal or junior to the subordinated notes.
Generally, we do not have the right to prepay the subordinated notes prior to
May 31, 2004, and thereafter, we may prepay the subordinated notes at a premium
of 5% of the face amount, which premium declines ratably through maturity.
Although the subordinated notes are unsecured, all of our subsidiaries have
guaranteed those obligations. The subordinated notes contain customary terms and
conditions, including various affirmative and negative covenants and the
obligation to offer to repurchase the notes at a premium under certain
circumstances. Among other things, the terms of the subordinated notes limit our
ability to make distributions to our unitholders, redeem or otherwise reacquire
any of our equity, incur additional indebtedness, incur or permit to exist
certain liens, make additional investments, engage in transactions with
affiliates, engage in certain types of businesses and dispose of assets under
certain circumstances, including if certain financial tests are not satisfied or
there is a default. In addition, we will be obligated to offer to repurchase the
subordinated notes if we experience certain types of changes of control or if we
dispose of certain assets and do not reinvest the proceeds or repay senior
indebtedness.


LEVIATHAN CREDIT FACILITY


     We have a revolving credit facility with a syndicate of commercial banks to
provide up to $375.0 million of available credit, subject to customary terms and
conditions, including certain limitations on incurring additional indebtedness
(including borrowings under this facility) if certain financial targets are not
achieved and maintained. In addition, we would be required to prepay a portion
of the balance outstanding under our credit facility to the extent such
financial targets are not achieved and maintained. As of August 9, 1999 and as
of December 31, 1998 and 1997, we had $300.0 million, $338.0 million and $238.0
million, respectively, outstanding under our revolving credit facility. At our
election, interest under our revolving credit facility is determined by
reference to the reserve-adjusted London interbank offer rate ("LIBOR"), the
prime rate or the 90-day average certificate of deposit rate. The interest rate
at August 9, 1999 and at December 31, 1998 and 1997 was 7.7%, 7.1% and 6.6% per
annum, respectively. We pay a commitment fee on the unused and available to be
borrowed portion of the revolving credit facility. This fee varies between 0.25%
and 0.375% per annum and was 0.375% per annum at December 31, 1998. Concurrently
with the closing of the Series A note offering, we amended our revolving credit
facility to, among other things, increase the commitment fee to 0.50% per annum
and extend the maturity from December 1999 to May 2002.


     We may use amounts remaining under the revolving credit facility for
general partnership purposes, including financing capital expenditures, working
capital requirements, and, subject to certain limitations, distributions to
unitholders. We may also use our revolving credit facility to issue letters of
credit from time to time; however, no letters of credit are currently
outstanding. The revolving credit facility is guaranteed by the general partner
and each of our subsidiaries, and is collateralized by our management agreement,
substantially all of our assets and the general partner's 1.0% general partner
interest and approximate 1.0% nonmanaging interest in certain of our
subsidiaries.

     Interest and other financing costs totaled $21.3 million, $15.9 million and
$17.5 million for the years ended December 31, 1998, 1997 and 1996,
respectively. During the years ended December 31, 1998, 1997 and 1996, we
capitalized $1.1 million, $1.7 million and $11.9 million, respectively, of such
interest costs in connection with construction projects and drilling activities
in progress during such periods. At December 31, 1998 and 1997, the unamortized
portion of debt issue costs totaled $2.5 million and $3.7 million, respectively.
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<PAGE>   138

JOINT VENTURE CREDIT ARRANGEMENTS


     Each of Poseidon, Western Gulf and Stingray is a party to a credit
agreement (Viosca Knoll was a party to a credit agreement prior to June 1, 1999)
under which it has outstanding obligations that may restrict the payment of
distributions to its owners. Poseidon has a revolving credit facility with a
syndicate of commercial banks to provide up to $150.0 million for other working
capital needs. Poseidon's ability to borrow money under the facility is subject
to certain customary terms and conditions, including certain limitations on
incurring additional indebtedness (including borrowings under this credit
facility) if certain financial targets are not achieved and maintained. In
addition, Poseidon would be required to prepay a portion of the balance
outstanding under this credit facility to the extent such financial targets are
not achieved and maintained. The Poseidon credit facility is collateralized by a
substantial portion of Poseidon's assets and matures on April 30, 2001. As of
December 31, 1998 and 1997, Poseidon had $131.0 million and $120.5 million,
respectively, outstanding under its credit facility bearing interest at an
average floating rate of 6.9% and 7.2% per annum, respectively. As of August 9,
1999, Poseidon had $140.0 million outstanding under its credit facility bearing
interest at a floating rate of 6.2% per annum and had approximately $10.0
million of additional borrowing available under this facility.



     Stingray has an existing term loan agreement with a syndicate of commercial
banks which matures on March 31, 2003. This credit agreement requires Stingray
to make 18 quarterly principal payments of approximately $1.6 million commencing
December 31, 1998, and is principally collateralized by current and future
natural gas transportation contracts between Stingray and its customers. As of
December 31, 1998 and 1997, Stingray had $26.9 million and $17.4 million,
respectively, outstanding under this credit agreement bearing interest at an
floating rate of 6.5% per annum. On the earlier to occur of March 31, 2003 or
the accelerated due date pursuant to the Stingray credit agreement, if Stingray
has not paid all amounts due under its credit agreement, we are obligated to pay
the lesser of (1) $8.5 million, (2) the aggregate amount of distributions
received by us from Stingray subsequent to January 1, 1998 or (3) 50.0% of any
then outstanding amounts due pursuant to the Stingray credit agreement. We do
not expect to have to pay any amount pursuant to this obligation. As of August
9, 1999, Stingray had $23.7 million outstanding under this credit facility
bearing interest at a floating rate of 6.3% per annum.



     In January 1999, Western Gulf entered into a revolving credit facility with
a syndicate of commercial banks to provide up to $100.0 million for the
construction of the East Breaks system and for other working capital needs of
Western Gulf and East Breaks. Western Gulf's ability to borrow money under this
credit facility is subject to customary terms and conditions, including certain
limitations on incurring additional indebtedness (including borrowings under
this credit facility) if certain financial targets are not achieved and
maintained. In addition, Western Gulf would be required to prepay a portion of
the balance outstanding under this credit facility to the extent such financial
targets are not achieved and maintained. This credit facility, which matures in
February 2004, is secured by Western Gulf's ownership interest in HIOS and East
Breaks, as well as by all of East Breaks' material contracts and assets and
supported by the guarantee of East Breaks. In addition, we are obligated to
return up to $3.0 million in distributions paid to us by Western Gulf under
certain circumstances. As of August 9, 1999, Western Gulf had $50.1 million
outstanding under this credit facility bearing interest at a floating rate of
6.4% per annum and had approximately $49.9 million of additional funds available
under this facility.



     Prior to June 1, 1999, Viosca Knoll had a revolving credit facility with a
syndicate of commercial banks to provide up to $100.0 million for the original
construction of the Viosca Knoll system and for other working capital needs,
including funds for a one-time distribution of $25.0 million to the partners in
Viosca Knoll. Upon the consummation of the acquisition of the Viosca Knoll
interest, we repaid in full ($66.7 million) and terminated the Viosca Knoll
credit facility. Viosca Knoll's ability to borrow money under its credit
facility was subject to certain customary terms and conditions, including
certain limitations on incurring additional indebtedness (including borrowings
under this credit facility) if certain financial targets were not achieved and
maintained. In addition, Viosca Knoll was required to prepay a portion of the
balance outstanding under this credit facility to the extent such financial
targets were not achieved and maintained. The Viosca Knoll credit facility was
collateralized by all of Viosca Knoll's material contracts and agreements,
receivables and inventory, and matured on December 20, 2001. If Viosca Knoll
failed to

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<PAGE>   139


pay any principal, interest or other amounts due under to the Viosca Knoll
credit facility, Leviathan was obligated to reimburse Viosca Knoll or pay to the
banks distributions Leviathan had received from Viosca Knoll up to a maximum of
$2.5 million. As of May 31, 1999 and December 31, 1998 and 1997, Viosca Knoll
had $66.7 million, $66.7 million and $52.2 million, respectively, outstanding
under the Viosca Knoll credit facility bearing interest at an average floating
rate of 6.7% per annum.


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<PAGE>   140

                           THE PARTNERSHIP AGREEMENT

     The following paragraphs are a summary of certain provisions of our
Partnership Agreement. The following discussion is qualified in its entirety by
reference to the Partnership Agreement.

PURPOSE

     Our stated purposes under the Partnership Agreement are to serve as the
managing member of its subsidiaries and to engage in any business activity
permitted under Delaware law. The general partner is generally authorized to
perform all acts deemed necessary to carry out these purposes and to conduct
Leviathan's business. The partnership will continue in existence until December
31, 2043, unless sooner dissolved pursuant to the terms of the Partnership
Agreement.

AUTHORITY OF THE GENERAL PARTNER

     The general partner has a power of attorney to take certain actions,
including the execution and filing of documents, on Leviathan's behalf and with
respect to the Partnership Agreement. However, the Partnership Agreement limits
the authority of the general partner as follows:

     - Without the prior approval of holders of at least a majority of the
       units, the general partner may not, among other things, (a) sell or
       exchange all or substantially all of Leviathan's assets (whether in a
       single transaction or a series of related transactions) or (b) approve on
       Leviathan's behalf the sale, exchange or other disposition of all or
       substantially all of the assets of Leviathan's subsidiaries; however,
       Leviathan or its subsidiaries may mortgage, pledge, hypothecate or grant
       a security interest in all or substantially all of their assets without
       such approval;

     - With certain exceptions generally described below under "-- Amendment of
       Partnership Agreement," an amendment to a provision of the Partnership
       Agreement generally requires the approval of the holders of at least
       66 2/3% of the outstanding units;

     - With certain exceptions described below, any amendment that would
       materially and adversely affect the rights and preference of any type or
       class of partnership interests in relation to other types or classes of
       partnership interests will require the approval of the holders of at
       least a majority of such type or class of partnership interest (excluding
       those held by the general partner and its affiliates); and

     - In general, the general partner may not take any action, or refuse to
       take any reasonable action, the effect of which would be to cause
       Leviathan or its subsidiaries to be taxable as a corporation or to be
       treated as an association taxable as a corporation for federal income tax
       purposes, without the consent of the holders of at least 66 2/3% of the
       outstanding units, including the vote of the holders of a majority of the
       preference units (other than preference units held by the general partner
       and its affiliates).

WITHDRAWAL OR REMOVAL OF THE GENERAL PARTNER

     The general partner has agreed not to voluntarily withdraw as general
partner of Leviathan on or prior to December 31, 2002 (with limited exceptions
described below) without the approval of at least a majority of the remaining
outstanding units and by providing an opinion of counsel that (following the
selection of a successor) its withdrawal would not result in the loss of limited
liability or cause Leviathan or its subsidiaries to be taxed as an entity for
federal income tax purposes. However, the general partner may withdraw without
such approval of the unitholders, upon 90 days' notice, if more than 50.0% of
the outstanding preference units are held or controlled by one person and its
affiliates other than the withdrawing general partner and its affiliates.

     After December 31, 2002, the general partner may withdraw as such general
partner by giving 90 days' written notice. If such an opinion of counsel cannot
be obtained, Leviathan and/or its subsidiaries, as the case may be, will be
dissolved as a result of such withdrawal.

                                       136
<PAGE>   141

     The general partner may not be removed, with or without cause, as general
partner of Leviathan except upon approval by the affirmative vote of (after the
closing of the Viosca Knoll transaction) the holders of not less than 55.0% of
the outstanding units, subject to the satisfaction of certain conditions.

     In the event of withdrawal of the general partner where such withdrawal
violates the Partnership Agreement or removal of the general partner for
"cause," a successor general partner will have the option to acquire the general
partner interest of the departing general partner (the "Departing Partner") in
Leviathan and, if requested by the Departing Partner, its nonmanaging interests
in its subsidiaries, for a fair market value cash payment. Under all other
circumstances where the general partner withdraws or is removed by the limited
partners, the Departing Partner will have the option to require the successor
general partner to acquire the general partner and nonmanaging interests of the
Departing Partner for a fair market value cash payment.

     The general partner may transfer all, but not less than all, of its general
partner interest in Leviathan and its nonmanaging interests in its subsidiaries
without the approval of the limited partners (1) to an affiliate of the general
partner or (2) upon its merger or consolidation into another entity or the
transfer of all or substantially all of its assets to another entity. In the
case of any other transfer, in addition to the foregoing requirements, the
approval of the holders of at least a majority of the outstanding units is
required, excluding for purposes of such determination units held by the general
partner and its affiliates. However, no approval of the unitholders is required
for transfers of the stock or other securities of the general partner.

REDEMPTION AND LIMITED CALL RIGHT

     After approximately August 2000, any or all of the outstanding preference
units may be redeemed at any time at Leviathan's option, exercised in the sole
discretion of the general partner, upon at least 30 but not more than 60 days'
notice. If, after giving effect to an anticipated redemption, fewer than
1,000,000 preference units would be held by persons other than the general
partner and its affiliates, Leviathan must redeem all such preference units if
it redeems any preference units.

     If at any time not more than 15.0% of the issued and outstanding units of
any class are held by persons other than the general partner and its affiliates,
the general partner will have the right, which it may assign and transfer to any
of its affiliates or to Leviathan, to purchase all, but not less than all, of
the outstanding units held by such nonaffiliated persons, as of a record date to
be selected by the general partner on at least 30 but not more than 60 days'
notice.

AMENDMENT OF PARTNERSHIP AGREEMENT

     Amendments to the Partnership Agreement may be proposed only by the general
partner. Proposed amendments (other than those described below) must be approved
by holders of at least 66 2/3% of the outstanding units, except (1) that any
amendment that would have a disproportionate material adverse effect on a class
of units will require the approval of the holders of at least a majority of the
outstanding units (excluding those held by the general partner and its
affiliates) of the class so affected or (2) as otherwise provided in the
Partnership Agreement. No provision of the Partnership Agreement that
establishes a percentage of outstanding units required to take any action may be
amended or otherwise modified to reduce such voting requirement without the
approval of the holders of that percentage of outstanding Units constituting the
voting requirement sought to be amended.

     In general, amendments which would enlarge the obligations of the limited
partners or the general partner require the consent of the limited partner or
general partner, as applicable. Notwithstanding the foregoing, the Partnership
Agreement permits the general partner to make certain amendments to the
Partnership Agreement without the approval of any limited partner, including,
subject to certain limitations, (1) an amendment that in the sole discretion of
the general partner is necessary or desirable in connection with the
authorization of additional preference units or other equity securities of
Leviathan, (2) any amendment made, the effect of which is to separate into a
separate security, separate and apart from the units, the right of preference
unitholders to receive any arrearage, and (3) several other
                                       137
<PAGE>   142

amendments expressly permitted in the Partnership Agreement to be made by the
general partner acting alone.

     In addition, the general partner may make amendments to the Partnership
Agreement without the approval of any limited partner if such amendments do not
adversely affect the limited partners in any material respect, or are required
by law or by the Partnership Agreement.

     No other amendments to the Partnership Agreement will become effective
without the approval of at least 95.0% of the units unless Leviathan obtains an
opinion of counsel to the effect that such amendment will not cause Leviathan to
be taxable as a corporation or otherwise taxed as an entity for federal income
tax purposes and will not affect the limited liability of any limited partner or
any member of Leviathan's subsidiaries.

MEETINGS; VOTING

     Record holders of units on the record date set pursuant to the Partnership
Agreement will be entitled to notice of, and to vote at, meetings of limited
partners. Meetings of the limited partners may only be called by the general
partner or, with respect to meetings called to remove the general partner, by
limited partners owning 55% or more of the outstanding units.

     The general partner does not anticipate that any meeting of limited
partners will be called in the foreseeable future (or that action by written
consent will occur). Representation in person or by proxy of two-thirds (or a
majority, if that is the vote required to take action at the meeting in
question) of the outstanding units of the class for which a meeting is to be
held will constitute a quorum at a meeting of limited partners. Except for (a) a
proposal for removal or withdrawal of the general partner, (b) the sale of all
or substantially all of the Partnership's assets or (c) certain amendments to
the Partnership Agreement described above, substantially all matters submitted
for a vote are determined by the affirmative vote, in person or by proxy, of
holders of at least a majority of the outstanding units.

     Each record holder of a unit has one vote per unit, according to his
percentage interest in Leviathan. However, the Partnership Agreement does not
restrict the general partner from issuing units having special or superior
voting rights.

INDEMNIFICATION

     The Partnership Agreement provides that Leviathan:

     - will indemnify the general partner, any Departing Partner and any person
       who is or was an officer or director of the general partner or any
       Departing Partner, to the fullest extent permitted by law, and

     - may indemnify, to the fullest extent permitted by law, (a) any person who
       is or was an affiliate of the general partner or any Departing Partner,
       (b) any person who is or was an employee, partner, agent or trustee of
       the general partner, any Departing Partner or any such affiliate, or (c)
       any person who is or was serving at the request of Leviathan as an
       officer, director, employee, partner, member or agent of another
       corporation, partnership, joint venture, trust, committee or other
       enterprise;

(each, as well as any employee, partner or agent of the general partner, any
Departing Partner or any of their affiliates, an "Indemnitee") from and against
any and all claims, damages, expenses and fines, whether civil, criminal,
administrative or investigative, in which any Indemnitee may be involved, or is
threatened to be involved, as a party or otherwise, by reason of its status as
(1) the general partner, Departing Partner or an affiliate of either, (2) an
officer, director, employee, partner, agent or trustee of the general partner,
any Departing Partner or any of their affiliates or (3) a person serving at the
request of Leviathan in any other entity in a similar capacity. Indemnification
will be conditioned on the determination that, in each case, the Indemnitee
acted in good faith, in a manner which such Indemnitee

                                       138
<PAGE>   143

believed to be in, or not opposed to, the best interests of Leviathan and, with
respect to any criminal proceeding, had no reasonable cause to believe its
conduct was unlawful.

     The above indemnification may result in indemnification of Indemnitees for
negligent acts, and may include indemnification for liabilities under the
Securities Act. Leviathan has been advised that, in the opinion of the
Securities and Exchange Commission, such indemnification is against public
policy as expressed in the Securities Act and is, therefore, unenforceable. Any
indemnification under these provisions will be only out of Leviathan's assets.
Leviathan is authorized to purchase (or to reimburse the general partner or its
affiliates for the cost of) insurance against liabilities asserted against and
expenses incurred by such persons in connection with Leviathan's activities,
whether or not Leviathan would have the power to indemnify such Person against
such liabilities under the provisions described above.

GENERAL PARTNER EXPENSES

     Our general partner will be reimbursed for its direct and indirect expenses
incurred on our behalf on a monthly or other appropriate basis as provided for
in the Partnership Agreement, including, without limitation, expenses allocated
to the general partner by its affiliates and payments made by our general
partner to El Paso Energy and its affiliates pursuant to the management
agreement.

CONVERSION OF PREFERENCE UNITS INTO COMMON UNITS.


     Holders of approximately 71.0% of our outstanding preference units as of
August 12, 1999 opted to convert those units into common units by the expiration
of our second 90 day conversion option period, with commenced on May 14, 1999
and ended on August 12, 1999. During the first conversion option period, during
substantially the same period in 1998, approximately 94.0% of our preference
units were converted to common units. As a result of the second conversion
option period, a total of 291,299 preference units remain outstanding after the
conversion.


LIMITED LIABILITY

     Assuming that a limited partner does not take part in the control of
Leviathan's business, and that he otherwise acts in conformity with the
provisions of the Partnership Agreement, his liability under Delaware law will
be limited, subject to certain possible exceptions, generally to the amount of
capital he is obligated to contribute to Leviathan in respect of his units plus
his share of any of Leviathan's undistributed profits and assets.

TERMINATION, DISSOLUTION AND LIQUIDATION

     Leviathan will continue until December 31, 2043, unless sooner dissolved
pursuant to the Partnership Agreement. Leviathan will be dissolved upon (a) the
election of the general partner to dissolve Leviathan, if approved by the
holders of at least 66 2/3% of the outstanding units, (b) the sale, exchange or
other disposition of all or substantially all of Leviathan's assets and
properties or its subsidiaries, (c) bankruptcy or dissolution of the general
partner or (d) withdrawal or removal of the general partner or any other event
that results in its ceasing to be the general partner (other than by reason of
transfer in accordance with the Partnership Agreement or withdrawal or removal
following approval of a successor). Notwithstanding the foregoing, Leviathan
shall not be dissolved if within 90 days after such event the Partners agree in
writing to continue its business and to the appointment, effective as of the
date of such event, of a successor general partner.

     Upon a dissolution pursuant to clause (c) or (d) above, the holders of at
least 66 2/3% of the outstanding units may also elect, within certain time
limitations, to reconstitute Leviathan and continue its business on the same
terms and conditions set forth in the Partnership Agreement by forming a new
limited partnership on terms identical to those set forth in the Partnership
Agreement and having as a general partner an entity approved by the holders of
at least 66 2/3% of the outstanding units, subject to Leviathan's receipt of an
opinion of counsel that such reconstitution, continuation and approval will not
result in the loss of the limited liability of unitholders or cause Leviathan,
the reconstituted limited
                                       139
<PAGE>   144

partnership or Leviathan's subsidiaries to be taxable as a corporation or
otherwise subject to taxation as an entity for federal income tax purposes.

     Upon dissolution of Leviathan, unless it is reconstituted and continued as
a new limited partnership, a liquidator will liquidate Leviathan's assets and
apply the proceeds of the liquidation in the order of priority set forth in the
Partnership Agreement. The liquidator may defer liquidation or distribution of
Leviathan's assets and/or distribute assets to Partners in kind if it determines
that a sale or other disposition of Leviathan's assets would be unsuitable.

                                       140
<PAGE>   145

            CERTAIN UNITED STATES FEDERAL INCOME TAX CONSIDERATIONS

GENERAL

     The following is a summary of certain U.S. federal income tax consequences
associated with the exchange of Series A notes for Series B notes pursuant to
the exchange offer, and does not purport to be a complete analysis of all
potential tax effects. This summary is based upon the Internal Revenue Code of
1986, as amended, existing and proposed regulations thereunder, published
rulings and court decisions, all as in effect and existing on the date of this
prospectus and all of which are subject to change at any time, which change may
be retroactive. This summary is not binding on the Internal Revenue Service
("IRS") or on the courts, and no ruling will be requested from the IRS on any
issues described below. There can be no assurance that the IRS will not take a
different position concerning the matters discussed below. This summary applies
only to those persons who are the initial holders of Series A notes, who
acquired Series A notes for cash and who hold Series A notes as capital assets,
and assumes that the Series A notes were not issued with "original issue
discount," as defined in the Internal Revenue Code. It does not address the tax
consequences to taxpayers who are subject to special rules, such as financial
institutions, tax-exempt organizations, insurance companies and persons who are
not "U.S. Holders," or the effect of any applicable U.S. federal estate and gift
tax laws or state, local or foreign tax laws. For purposes of this summary, a
"U.S. Holder" means a beneficial owner of a note who purchased the notes
pursuant to the offering that is for U.S. federal income tax purposes:

     - a citizen or resident of the United States;

     - a corporation, partnership or other entity created or organized in or
       under the laws of the United States or any political subdivision thereof;

     - an estate, the income of which is subject to U.S. federal income taxation
       regardless of its source; or

     - a trust if (A) a court within the U.S. is able to exercise primary
       supervision over the administration of the trust, and (B) one or more
       U.S. fiduciaries have the authority to control all substantial decisions
       of the trust.

EXCHANGE OFFER

     The exchange of Series A notes for Series B notes pursuant to the exchange
offer should not constitute a taxable exchange for U.S. federal income tax
purposes. Accordingly, a U.S. Holder should not recognize gain or loss upon the
receipt of Series B notes pursuant to the exchange offer, and a U.S. Holder
should be required to include interest on the Series B notes in gross income in
the manner and to the extent interest income was includible under the Series A
notes. A U.S. Holder's holding period for the Series B notes should include the
holding period of the Series A notes exchanged therefor, and such U.S. Holder's
adjusted basis in the Series B notes should be the same as the basis of the
Series A notes exchanged therefor immediately before the exchange.

     THE FOREGOING DISCUSSION IS INCLUDED HEREIN FOR GENERAL INFORMATION ONLY.
ACCORDINGLY, EACH HOLDER SHOULD CONSULT WITH ITS OWN TAX ADVISORS CONCERNING THE
TAX CONSEQUENCES OF THE EXCHANGE OFFER WITH RESPECT TO ITS PARTICULAR SITUATION,
INCLUDING THE APPLICATION AND EFFECT OF STATE, LOCAL AND FOREIGN INCOME AND
OTHER TAX LAWS.

                                       141
<PAGE>   146

                              PLAN OF DISTRIBUTION


     Based on interpretations by the staff of the SEC set forth in no action
letters issued to third parties, we believe that you may freely transfer Series
B notes issued under the exchange offer in exchange for Series A notes, unless
you are:


     - our "affiliate" within the meaning of Rule 405 under the Securities Act;


     - a broker-dealer or an initial purchaser that acquired Series A notes
       directly from us; or


     - a broker-dealer that acquired Series A notes as a result of market-making
       or other trading activities without compliance with the registration and
       prospectus delivery provisions of the Securities Act;


provided that you acquire the Series B notes in the ordinary course of your
business and you are not engaged in, and do not intend to engage in, and have no
arrangement or understanding with any person to participate in, a distribution
of the Series B notes. Broker-dealers receiving Series B notes in the exchange
offer in exchange for Series A notes that were acquired in market-making or
other trading activities will be subject to a prospectus delivery requirement
with respect to resales of the Series B notes.



     To date, the staff of the SEC has taken the position that participating
broker-dealers may fulfill their prospectus delivery requirements with respect
to transactions involving an exchange of securities such as this exchange offer,
other than a resale of an unsold allotment from the original sale of the Series
A notes, with the prospectus contained in the exchange offer registration
statement. Pursuant to the registration agreement, we have agreed to permit such
participating broker-dealers to use this prospectus in connection with the
resale of Series B notes.



     If you wish to exchange your Series A notes for Series B notes in the
exchange offer, you will be required to make certain representations to us as
set forth in "The Exchange Offer -- Exchange Terms" and "-- Procedures for
Tendering Series A Notes -- Other Matters" of this prospectus beginning on pages
78 and 81, respectively, and in the letter of transmittal. In addition, if you
are a broker-dealer who receives Series B notes for your own account in exchange
for Series A notes that were acquired by you as a result of market-making
activities or other trading activities, you will be required to acknowledge that
you will deliver a prospectus in connection with any resale by you of those
Series B notes. See "The Exchange Offer -- Resale of Series B Notes" beginning
on page 79 of this prospectus.


     We will not receive any proceeds from any sale of Series B notes by
broker-dealers. Broker-dealers who receive Series B notes for their own account
in the exchange offer may sell them from time to time in one or more
transactions in the over-the-counter market:

     - in negotiated transactions;

     - through the writing of options on the Series B notes or a combination of
       such methods of resale;

     - at market prices prevailing at the time of resale; or

     - at prices related to the prevailing market prices or negotiated prices.


Any resale may be made directly to purchasers or to or through brokers or
dealers who may receive compensation in the form of commissions or concessions
from any broker-dealer or the purchasers of any Series B notes. Any
broker-dealer that resells Series B notes it received for its own account
pursuant to the exchange offer and any broker or dealer that participates in a
distribution of Series B notes may be deemed to be an "underwriter" within the
meaning of the Securities Act, and any profit on any resale of Series B notes
and any commissions or concessions received by any such persons may be deemed to
be underwriting compensation under the Securities Act. Although the letter of
transmittal requires a broker-dealer to deliver a prospectus, a broker-dealer
will not be deemed to admit that it is an "underwriter" within the meaning of
the Securities Act as a result of such delivery.


     We have agreed to pay all expenses incidental to the exchange offer other
than commissions and concessions of any brokers or dealers and will indemnify
holders of the Series A notes, including any
                                       142
<PAGE>   147

broker-dealers, against certain liabilities, including liabilities under the
Securities Act, as set forth in the registration rights agreement.

                                 LEGAL MATTERS

     Certain legal matters with respect to the offering of the Series B notes
being offered will be passed upon for us by Akin, Gump, Strauss, Hauer & Feld,
L.L.P., Houston, Texas.

                                    EXPERTS

     The consolidated financial statements of Leviathan Gas Pipeline Partners,
L.P. and its subsidiaries as of December 31, 1998 and 1997 and for each of the
three years in the period ended December 31, 1998 included in this Registration
Statement have been so included in reliance on the report of
PricewaterhouseCoopers LLP, independent accountants, given on the authority of
said firm as experts in auditing and accounting.

     The financial statements of Viosca Knoll Gathering Company as of December
31, 1998 and 1997 and for each of the three years in the period ended December
31, 1998 included in this Registration Statement have been so included in
reliance on the report of PricewaterhouseCoopers LLP, independent accountants,
given on the authority of said firm as experts in auditing and accounting.

     The statements of financial position of High Island Offshore System, L.L.C.
as of December 31, 1998 and 1997 and the related statements of income, members'
equity, and cash flows for each of the three years in the period ended December
31, 1998 included in this Registration Statement have been so included in
reliance on the report of Deloitte & Touche LLP, independent auditors, given
upon the authority of said firm as experts in auditing and accounting.

     The financial statements of Poseidon Oil Pipeline Company, L.L.C. as of
December 31, 1998 and 1997 and for the years ended December 31, 1998 and 1997
and for the period from inception (February 14, 1996) through December 31, 1996
included in this Registration Statement have been so included in reliance on the
report of Arthur Andersen LLP, independent public accountants, given on the
authority of said firm as experts in auditing and accounting.

     The financial statements of Neptune Pipeline Company, L.L.C. as of December
31, 1998 and 1997 and for the years then ended included in this Registration
Statement have been so included in reliance on the report of
PricewaterhouseCoopers LLP, independent accountants, given on the authority of
said firm as experts in auditing and accounting.

     The balance sheet of Leviathan Finance Corporation as of April 30, 1999
included in this Registration Statement has been so included in reliance on the
report of PricewaterhouseCoopers LLP, independent accountants, given on the
authority of said firm as experts in auditing and accounting.

     The balance sheet of Leviathan Gas Pipeline Company as of December 31, 1998
included in this Registration Statement has been so included in reliance on the
report of PricewaterhouseCoopers LLP, independent accountants, given on the
authority of said firm as experts in auditing and accounting.

     The information derived from the report of Netherland, Sewell & Associates,
Inc., independent petroleum engineers, with respect to estimated oil and natural
gas reserves of Leviathan Gas Pipeline Partners, L.P. and its subsidiaries
included in this Registration Statement have been so included in reliance upon
the authority of said firm as experts with respect to such matters contained in
their report.

                                       143
<PAGE>   148

                         INDEX TO FINANCIAL STATEMENTS


<TABLE>
<CAPTION>
                                                              PAGE
                                                              -----
<S>                                                           <C>
GLOSSARY TO CERTAIN FINANCIAL STATEMENTS....................    F-3
LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES
PRO FORMA:
  Unaudited Pro Forma Condensed Consolidated Financial
     Statements.............................................    F-4
  Unaudited Pro Forma Condensed Consolidated Statement of
     Operations for the Six Months Ended June 30, 1999......    F-6
  Unaudited Pro Forma Condensed Consolidated Statement of
     Operations for the Year Ended December 31, 1998........    F-7
  Notes to Unaudited Pro Forma Condensed Consolidated
     Financial Statements...................................    F-8
HISTORICAL:
  Condensed Consolidated Statements of Income for the
     Quarter and Six Months Ended June 30, 1999 and 1998
     (unaudited)............................................   F-11
  Condensed Consolidated Balance Sheets as of June 30, 1999
     (unaudited) and December 31, 1998......................   F-12
  Condensed Consolidated Statements of Cash Flows for the
     Six Months Ended June 30, 1999 and 1998 (unaudited)....   F-13
  Condensed Consolidated Statement of Partners' Capital for
     the Six Months Ended June 30, 1999 (unaudited).........   F-14
  Notes to Condensed Consolidated Financial Statements
     (unaudited)............................................   F-15
  Report of Independent Accountants.........................   F-27
  Consolidated Balance Sheet as of December 31, 1998 and
     1997...................................................   F-28
  Consolidated Statement of Operations for the Years Ended
     December 31, 1998, 1997 and 1996.......................   F-29
  Consolidated Statement of Cash Flows for the Years Ended
     December 31, 1998, 1997 and 1996.......................   F-30
  Consolidated Statement of Partners' Capital for the Years
     Ended December 31, 1996, 1997 and 1998.................   F-31
  Notes to Consolidated Financial Statements................   F-32
LEVIATHAN FINANCE CORPORATION
  Report of Independent Accountants.........................   F-59
  Balance Sheet as of April 30, 1999........................   F-60
  Note to Balance Sheet.....................................   F-61
VIOSCA KNOLL GATHERING COMPANY
  Report of Independent Accountants.........................   F-62
  Balance Sheet as of June 30, 1999 (unaudited) and December
     31, 1998 and 1997......................................   F-63
  Statement of Operations for the Six Months Ended June 30,
     1999 and 1998 (unaudited) and for the Years Ended
     December 31, 1998, 1997 and 1996.......................   F-64
  Statement of Cash Flows for the Six Months Ended June 30,
     1999 and 1998 (unaudited) and for the Years Ended
     December 31, 1998, 1997 and 1996.......................   F-65
  Statement of Partners' Capital for the Years Ended
     December 31, 1996, 1997 and 1998 and for the Six Months
     Ended June 30, 1999 (unaudited)........................   F-66
  Notes to Financial Statements.............................   F-67
</TABLE>


                                       F-1
<PAGE>   149
                  INDEX TO FINANCIAL STATEMENTS -- (CONTINUED)


<TABLE>
<CAPTION>
                                                              PAGE
                                                              -----
<S>                                                           <C>
HIGH ISLAND OFFSHORE SYSTEM, L.L.C.
  Independent Auditors' Report..............................   F-72
  Statements of Financial Position as of June 30, 1999
     (unaudited) and December 31, 1998
     and 1997...............................................   F-73
  Statements of Income and Statements of Members' Equity for
     the Six Months Ended June 30, 1999 and 1998 (unaudited)
     and for the Years Ended December 31, 1998, 1997 and
     1996...................................................   F-74
  Statements of Cash Flows for the Six Months Ended June 30,
     1999 and 1998 (unaudited) and for the Years Ended
     December 31, 1998, 1997 and 1996.......................   F-75
  Notes to the Financial Statements for the Years Ended
     December 31, 1998, 1997 and 1996.......................   F-76

POSEIDON OIL PIPELINE COMPANY, L.L.C.
  Report of Independent Public Accountants..................   F-79
  Balance Sheets -- December 31, 1998 and 1997..............   F-80
  Statements of Income for the Six Months Ended June 30,
     1999 and 1998 (unaudited) and for the Years Ended
     December 31, 1998 and 1997 and for the Period from
     Inception (February 14, 1996) through December 31,
     1996...................................................   F-81
  Statements of Members' Equity for the Years Ended December
     31, 1998 and 1997 and for the Period from Inception
     (February 14, 1996) through December 31, 1996..........   F-82
  Statements of Cash Flows for the Years Ended December 31,
     1998 and 1997 and for the Period from Inception
     (February 14, 1996) through December 31, 1996..........   F-83
  Notes to Financial Statements -- December 31, 1998, 1997
     and 1996...............................................   F-84

NEPTUNE PIPELINE COMPANY, L.L.C.
  Report of Independent Accountants.........................   F-88
  Consolidated Balance Sheet as of December 31, 1998 and
     1997...................................................   F-89
  Consolidated Statement of Income for the Years Ended
     December 31, 1998 and 1997.............................   F-90
  Consolidated Statement of Cash Flows for the Years Ended
     December 31, 1998 and 1997.............................   F-91
  Statement of Members' Capital as of December 31, 1998 and
     1997...................................................   F-92
  Notes to Consolidated Financial Statements -- December 31,
     1998...................................................   F-93

LEVIATHAN GAS PIPELINE COMPANY
  Report of Independent Accountants.........................   F-98
  Balance Sheet as of December 31, 1998.....................   F-99
  Notes to Balance Sheet....................................  F-100
</TABLE>


                                       F-2
<PAGE>   150


                                    GLOSSARY



     The following abbreviations, acronyms or defined terms used in certain
financial statements are defined below:



Bcf........................ Billion cubic feet



East Breaks................ East Breaks Gathering Company, L.L.C., a Delaware
                            limited liability company and wholly owned
                            subsidiary of Western Gulf



El Paso Energy............. El Paso Energy Corporation, a Delaware corporation
                            and the indirect parent of the General Partner



EPFS....................... El Paso Field Services Company, a Delaware
                            corporation and a wholly owned subsidiary of El Paso
                            Energy



Equity Investees........... Collectively refers to Stingray, West Cameron Dehy,
                            POPCO, Manta Ray Offshore, Nautilus, HIOS, UTOS and
                            prior to June 1, 1999, Viosca Knoll



General Partner............ Leviathan Gas Pipeline Company, a Delaware
                            corporation and wholly owned indirect subsidiary of
                            El Paso Energy



Green Canyon............... Green Canyon Pipe Line Company, L.L.C., a Delaware
                            limited liability company and wholly owned
                            subsidiary of Leviathan



Gulf....................... Gulf of Mexico



HIOS....................... High Island Offshore System, L.L.C., a Delaware
                            limited liability company and wholly owned
                            subsidiary of Western Gulf



Leviathan.................. Leviathan Gas Pipeline Partners, L.P., a publicly
                            held Delaware master limited partnership, and its
                            subsidiaries, unless the context otherwise requires



Manta Ray Offshore......... Manta Ray Offshore Gathering Company, L.L.C., a
                            Delaware limited liability company and owned by
                            Neptune and Ocean Breeze



Mcf........................ Thousand cubic feet



MMcf....................... Million cubic feet



MMbtu...................... Million British thermal units



Nautilus................... Nautilus Pipeline Company, L.L.C., a Delaware
                            limited liability company and owned by Neptune and
                            Ocean Breeze



Neptune.................... Neptune Pipeline Company, L.L.C., a Delaware limited
                            liability company in which Leviathan owns a 25.67%
                            member interest



Ocean Breeze............... Ocean Breeze Pipeline Company, L.L.C., a Delaware
                            limited liability company in which Leviathan owns a
                            25.67% member interest



NYMEX...................... New York Mercantile Exchange



POPCO...................... Poseidon Oil Pipeline Company, L.L.C., a Delaware
                            limited liability company in which Leviathan owns a
                            36% member interest



Stingray................... Stingray Pipeline Company, L.L.C., a Delaware
                            limited liability company in which Leviathan owns a
                            50% member interest



Tarpon..................... Tarpon Transmission Company, a Texas corporation and
                            wholly owned subsidiary of Leviathan



UTOS....................... U-T Offshore System, a Delaware partnership in which
                            Leviathan collectively owns a 66.67% member interest



West Cameron Dehy.......... West Cameron Dehydration Company, L.L.C., a Delaware
                            limited liability company in which Leviathan owns a
                            50% member interest



Western Gulf............... Western Gulf Holdings, L.L.C., a Delaware limited
                            liability company in which Leviathan collectively
                            owns a 60% member interest



Viosca Knoll............... Viosca Knoll Gathering Company, a Delaware general
                            partnership in which Leviathan owns a 99%
                            partnership interest


                                       F-3
<PAGE>   151


             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES



                   UNAUDITED PRO FORMA CONDENSED CONSOLIDATED


                              FINANCIAL STATEMENTS



     The unaudited pro forma condensed consolidated statements of operations for
the six months ended June 30, 1999 and for the year ended December 31, 1998 have
been prepared based on the historical consolidated statements of operations of
Leviathan Gas Pipeline Partners, L.P. and its subsidiaries ("Leviathan"). The
historical statements of operations were adjusted to give effect to the
transactions identified below (the "Transactions") as if the Transactions had
occurred on January 1, 1998. An unaudited pro forma consolidated balance sheet
is not presented as the historical results of Leviathan as of June 30, 1999
include the results of the Transactions.



     Leviathan, a publicly held Delaware master limited partnership, is
primarily engaged in the gathering and transportation and production of natural
gas and crude oil in the Gulf of Mexico (the "Gulf"). Through its subsidiaries
and joint ventures, Leviathan owns interests in certain significant assets,
including (i) nine (eight existing and one under construction) natural gas
pipelines, (ii) two (one existing and one under construction) crude oil pipeline
systems, (iii) six strategically-located multi-purpose platforms, (iv) a
dehydration facility, (v) four producing oil and natural gas properties and (vi)
a 100% working interest in a non-producing oil and natural gas unit comprised of
Ewing Bank Blocks 958, 959, 1002 and 1003.



     The unaudited pro forma financial information gives effect to the following
Transactions:



     (1) In May 1999, Leviathan sold $175 million of Senior Subordinated Notes
due May 2009 (the "Subordinated Notes"). Proceeds from the Subordinated Notes
were used (a) to fund the cash portion of the acquisition of the additional
interest in Viosca Knoll Gathering Company ("Viosca Knoll") as described in (2)
below, (b) to repay outstanding principal under Viosca Knoll's credit facility
discussed in (2) below, (c) to reduce the balance outstanding on Leviathan's
$375 million credit facility, as amended and restated, (the "Credit Facility")
and (d) to pay fees and expenses incurred in connection with the sale of the
Subordinated Notes and the Credit Facility.



     (2) On January 21, 1999, Leviathan entered into a Contribution Agreement
with El Paso Field Services Company ("El Paso"), to acquire all of El Paso's
interest in Viosca Knoll, other than a 1% interest in profits and capital in
Viosca Knoll. At the time the Contribution Agreement was executed, Leviathan and
El Paso each beneficially owned a 50% interest in Viosca Knoll. On June 1, 1999
(the "Closing Date"), Leviathan and El Paso consummated the Viosca Knoll
transactions. In connection therewith, (i) a subsidiary of El Paso contributed
to Viosca Knoll $33,350,000 (the "Capital Contribution"), which amount was equal
to 50% of the amount then outstanding under Viosca Knoll's credit facility, (ii)
a subsidiary of Leviathan acquired a 49% interest in Viosca Knoll from a
subsidiary of El Paso in exchange for the cash payment of $19,930,750 and the
issuance of 2,661,870 Common Units, and (iii) as required by Leviathan's Amended
and Restated Agreement of Limited Partnership, Leviathan Gas Pipeline Company,
Leviathan's general partner, contributed $603,962 to Leviathan in order to
maintain its 1% capital account balance. Concurrently with the closing of the
Viosca Knoll transactions, Leviathan also contributed $33,350,000 to Viosca
Knoll. These funds and the Capital Contribution were used to repay and terminate
Viosca Knoll's credit facility. Furthermore, effective on the Closing Date,
Leviathan began consolidating the accounts and operations of Viosca Knoll.



     (3) On June 30, 1999, Leviathan acquired (i) all of the outstanding stock
of Natoco, Inc., which owns a 20% member interest in Western Gulf Holdings,
L.L.C. ("Western Gulf"), which in turn owns 100% of High Island Offshore System,
L.L.C. ("HIOS") and East Breaks Gathering Company, L.L.C. ("East Breaks"), and
Naloco, Inc. (Del.), which owns a 33 1/3% interest in U-T Offshore System
("UTOS") and (ii) various ownership interests in certain lateral pipelines
located in the Gulf from Natural Gas Pipeline Company of America ("NGPL"), a
subsidiary of KN Energy, Inc. (collectively the "HIOS/UTOS Transactions"). The
East Breaks system is currently under construction and will initially consist of
85 miles of pipeline, with a design capacity of over 400 million cubic feet of
natural gas per day,


                                       F-4
<PAGE>   152
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

                   UNAUDITED PRO FORMA CONDENSED CONSOLIDATED
                      FINANCIAL STATEMENTS -- (CONTINUED)


and related facilities connecting the Diana/Hoover prospects developed by Exxon
Company USA and BP Amoco plc in Alaminos Canyon Block 25 in the Gulf, with the
HIOS system. The new pipeline and related facilities are anticipated to be in
service in late 2000. The UTOS system transports natural gas from the terminus
of the HIOS system to the Johnson Bayou facility in southern Louisiana with
access to one intrastate and four interstate pipelines. Additionally, Stingray
Pipeline Company, L.L.C., which is owned 50% by each of Leviathan and NGPL,
purchased from NGPL certain offshore laterals that connect to the Stingray
pipeline for approximately $5 million. After a transition period that could end
as soon as October 1, 1999, but not later than January 1, 2000, Leviathan will
assume NGPL's role as operator of the Stingray pipeline, the Stingray Onshore
Separation Facility, the West Cameron Dehydration Facility and certain other
lateral pipelines (the "Related Facilities"). Leviathan financed this
acquisition with funds from the Credit Facility.



     The unaudited pro forma condensed consolidated statements of operations are
not necessarily indicative of Leviathan's consolidated results of operations
that might have occurred had the Transactions been completed at the beginning of
the period specified, and do not purport to indicate Leviathan's consolidated
results of operations for any future period. The unaudited pro forma condensed
consolidated statements of operations should be read in the context of the
related historical consolidated statements of operations and notes thereto
included in Leviathan's Annual Report on Form 10-K for the year ended December
31, 1998 and Quarterly Report on Form 10-Q for the quarterly period ended June
30, 1999.


                                       F-5
<PAGE>   153


             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES



       UNAUDITED PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS


                         SIX MONTHS ENDED JUNE 30, 1999


                    (IN THOUSANDS, EXCEPT PER UNIT AMOUNTS)



<TABLE>
<CAPTION>
                                                                                PRO FORMA ACQUISITION
                                                   PRO FORMA     HISTORICAL          ADJUSTMENTS
                                     HISTORICAL    FINANCING       VIOSCA     -------------------------
                                     LEVIATHAN    ADJUSTMENTS      KNOLL      VIOSCA KNOLL    HIOS/UTOS    PRO FORMA
                                     ----------   -----------    ----------   ------------    ---------    ---------
<S>                                  <C>          <C>            <C>          <C>             <C>          <C>
Revenue:
  Oil and natural gas sales........   $ 15,100     $     --       $    49       $    (8)(e)    $   --      $ 15,141
  Gathering, transportation and
    platform services..............     10,798           --        14,743        (2,446)(e)       645(k)     23,740
  Equity in earnings...............     19,953           --            --        (3,860)(f)     1,040(l)     17,404
                                                                                                  166(l)
                                                                                                  105(m)
                                      --------     --------       -------       -------        ------      --------
                                        45,851           --        14,792        (6,314)        1,956        56,285
                                      --------     --------       -------       -------        ------      --------
Costs and expenses:
  Operating expenses...............      5,025           --         1,129          (268)(e)       175(k)      6,061
  Depreciation, depletion and
    amortization...................     13,727           --         2,191           637(g)        198(k)     16,315
                                                                                   (438)(e)
  General and administrative
    expenses and management fee....      5,909           --            71            (8)(e)        --         5,972
                                      --------     --------       -------       -------        ------      --------
                                        24,661           --         3,391           (77)          373        28,348
                                      --------     --------       -------       -------        ------      --------
Operating income...................     21,190           --        11,401        (6,237)        1,583        27,937
Interest and other income..........        268           --            33            (2)(e)       500(n)        799
Interest and other financing
  costs............................    (13,868)      13,868(a)     (1,973)        1,973(h)         --       (20,805)
                                                     (9,078)(b)
                                                       (294)(b)
                                                    (11,433)(c)
Minority interests in (income)
  loss.............................        (80)          70(d)         --            17(e)        (21)(o)      (181)
                                                                                   (167)(i)
                                      --------     --------       -------       -------        ------      --------
Income before income taxes.........      7,510       (6,867)        9,461        (4,416)        2,062         7,750
Income tax benefit.................        177           --            --            --            --           177
                                      --------     --------       -------       -------        ------      --------
Net income.........................   $  7,687     $ (6,867)      $ 9,461       $(4,416)       $2,062      $  7,927
                                      ========     ========       =======       =======        ======      ========
Weighted average number units
  outstanding......................     24,808                                    2,221(j)                   27,029
                                      ========                                  =======                    ========
Basic and diluted net income per
  unit.............................   $   0.25                                                             $   0.24
                                      ========                                                             ========
</TABLE>



    The accompanying notes are an integral part of this financial statement.

                                       F-6
<PAGE>   154


             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES



       UNAUDITED PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS


                          YEAR ENDED DECEMBER 31, 1998


                    (IN THOUSANDS, EXCEPT PER UNIT AMOUNTS)



<TABLE>
<CAPTION>
                                                                                      PRO FORMA ACQUISITION
                                                        PRO FORMA     HISTORICAL           ADJUSTMENTS
                                          HISTORICAL    FINANCING       VIOSCA      -------------------------
                                          LEVIATHAN    ADJUSTMENTS      KNOLL       VIOSCA KNOLL    HIOS/UTOS     PRO FORMA
                                          ----------   -----------    ----------    ------------    ---------     ---------
<S>                                       <C>          <C>            <C>           <C>             <C>           <C>
Revenue:
  Oil and natural gas sales.............   $ 31,411     $     --       $   528        $     --       $   --       $ 31,939
  Gathering, transportation and platform
    services............................     17,320           --        28,806              --        1,289(k)      47,415
  Equity in earnings....................     26,724           --            --          (9,113)(f)    2,679(l)      21,048
                                                                                                        548(l)
                                                                                                        210(m)
                                           --------     --------       -------        --------       ------       --------
                                             75,455           --        29,334          (9,113)       4,726        100,402
                                           --------     --------       -------        --------       ------       --------
Costs and expenses:
  Operating expenses....................     11,369           --         2,877              --          349(k)      14,595
  Depreciation, depletion and
    amortization........................     29,267           --         3,860           1,274(g)       396(k)      34,797
  Impairment, abandonment and other.....     (1,131)          --            --              --           --         (1,131)
  General and administrative expenses
    and management fee..................     16,189           --           154              --           --         16,343
                                           --------     --------       -------        --------       ------       --------
                                             55,694           --         6,891           1,274          745         64,604
                                           --------     --------       -------        --------       ------       --------
Operating income........................     19,761           --        22,443         (10,387)       3,981         35,798
Interest and other income...............        771           --            50              --        1,000(n)       1,821
Interest and other financing costs......    (20,242)      20,242(a)     (4,267)          4,267(h)        --        (36,151)
                                                         (18,156)(b)
                                                            (589)(b)
                                                         (17,406)(c)
Minority interests in (income) loss.....        (15)         161(d)         --            (347)(i)      (50)(o)       (251)
                                           --------     --------       -------        --------       ------       --------
Income before income taxes..............        275      (15,748)       18,226          (6,467)       4,931          1,217
Income tax benefit......................        471           --            --              --           --            471
                                           --------     --------       -------        --------       ------       --------
Net income..............................   $    746     $(15,748)      $18,226        $ (6,467)      $4,931       $  1,688
                                           ========     ========       =======        ========       ======       ========
Weighted average number units
  outstanding...........................     24,367                                      2,662(j)                   27,029
                                           ========                                   ========                    ========
Basic and diluted net income per unit...   $   0.02                                                               $   0.05
                                           ========                                                               ========
</TABLE>



    The accompanying notes are an integral part of this financial statement.

                                       F-7
<PAGE>   155


             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES



                     NOTES TO UNAUDITED PRO FORMA CONDENSED


                     CONSOLIDATED STATEMENTS OF OPERATIONS



     The unaudited pro forma condensed consolidated statements of operations
have been prepared to reflect the Transactions described on pages F-4 and F-5
and the application of the adjustments to the historical amounts as described
below:



     (a)To reverse Leviathan's historical interest expense.



     (b)To record (i) interest expense on the Subordinated Notes at a rate of
        10 3/8% per annum and (ii) amortization of debt issue costs related to
        the Subordinated Notes ($5.9 million) over ten years.



     (c)To record interest expense and amortization of debt issue costs related
        to the amended and restated Credit Facility calculated as follows (in
        thousands):



<TABLE>
<CAPTION>
SIX MONTHS ENDED JUNE 30, 1999                        1ST QUARTER     2ND QUARTER    TOTAL
- ------------------------------                        -----------     -----------   -------
<S>                                                   <C>             <C>           <C>
Credit Facility interest expense:
  Outstanding balance at beginning of quarter.......   $277,079        $294,079
  Quarterly borrowings..............................     17,000          12,421
                                                       --------        --------
  Outstanding balance at end of quarter.............   $294,079        $306,500
  Average outstanding balance.......................   $285,579        $300,290
  Assumed average interest rate.....................        7.5%            7.5%
  Assumed quarterly interest expense................   $  5,355        $  5,630     $10,985
  Less capitalized interest......................................................      (755)
  Commitment fees and other......................................................        82
                                                                                      1,121see(x)
  Amortization of debt issue costs...............................................           below
                                                                                    -------
  Adjusted interest expense......................................................   $11,433
                                                                                    =======
Credit Facility debt issue costs:
  Balance of debt issue costs as of January 1,
     1998...........................................   $  3,749
  Amendment and restatement fees....................      2,975
                                                       --------
                                                          6,724
  Life of Credit Facility...........................    3 years
  Debt issue cost amortization for six months.......   $  1,121(x)
                                                       ========
</TABLE>





                                       F-8
<PAGE>   156

             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES



                     NOTES TO UNAUDITED PRO FORMA CONDENSED


              CONSOLIDATED STATEMENTS OF OPERATIONS -- (CONTINUED)



<TABLE>
<CAPTION>
YEAR ENDED DECEMBER 31, 1998     1ST QUARTER    2ND QUARTER   3RD QUARTER   4TH QUARTER    TOTAL
- ----------------------------     -----------    -----------   -----------   -----------   -------
<S>                              <C>            <C>           <C>           <C>           <C>
Credit Facility interest
  expense:
  Outstanding balance as of
     January 1, 1998...........   $238,000
  Net reduction of Credit
     Facility(1)...............    (60,921)
                                  --------
  Outstanding balance at
     beginning of quarter......    177,079       $190,079      $209,079      $230,079
  Quarterly borrowings.........     13,000         19,000        21,000        47,000
                                  --------       --------      --------      --------
  Outstanding balance at end of
     quarter...................   $190,079       $209,079      $230,079      $277,079
  Average outstanding
     balance...................   $183,579       $199,579      $219,579      $253,579
  Assumed average interest
     rate......................        7.5%           7.5%          7.5%          7.5%
  Assumed quarterly interest
     expense...................   $  3,442       $  3,742      $  4,117      $  4,755     $16,056
Less capitalized interest..............................................................    (1,066)
Commitment fees........................................................................       175
                                                                                            2,241see(y)
Amortization of debt issue costs.......................................................           below
                                                                                          -------
Adjusted interest expense..............................................................   $17,406
                                                                                          =======
Credit Facility debt issue
  costs:
  Balance of debt issue costs
     as of January 1, 1998.....   $  3,749
  Amendment and restatement
     fees......................      2,975
                                  --------
                                     6,724
  Life of Credit Facility......    3 years
                                  --------
  Annual debt issue cost
     amortization..............   $  2,241(y)
                                  ========
</TABLE>


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


     (1)  The net reduction of the Credit Facility on January 1, 1998 is
          calculated as follows (in thousands):



<TABLE>
<S>                                                           <C>
Proceeds from the Subordinated Notes........................  $175,000
Fees and expenses related to sale of the Subordinated
  Notes.....................................................    (5,885)
Cash portion of the acquisition of the additional Viosca
  Knoll interest............................................   (20,741)
Repayment and cancellation of Viosca Knoll's credit
  facility..................................................   (33,350)
Fees and expenses associated with the amended and restated
  Credit Facility...........................................    (2,975)
Consummate the HIOS/UTOS Transactions.......................   (51,128)
                                                              --------
  Net reduction of the Credit Facility......................  $ 60,921
                                                              ========
</TABLE>



     (d)To record the minority interest in expense for the approximate 1.0%
        minority interest ownership in certain of Leviathan's subsidiaries.



     (e)To reverse the June 1999 results of operations of Viosca Knoll which are
        included in Leviathan's historical results of operations as Leviathan
        began consolidating Viosca Knoll on June 1, 1999.


                                       F-9
<PAGE>   157

             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES



                     NOTES TO UNAUDITED PRO FORMA CONDENSED


              CONSOLIDATED STATEMENTS OF OPERATIONS -- (CONTINUED)



     (f)To reverse Leviathan's historical equity in earnings of Viosca Knoll.



     (g)To record depreciation expense associated with the allocation of the
        excess purchase price to Viosca Knoll's property and equipment. Such
        equipment will be depreciated on a straight-line basis over the
        remaining useful lives of the assets which approximate 25 years.



     (h)To reverse interest expense related to Viosca Knoll's credit facility
        which was repaid with the proceeds from the Capital Contribution and the
        Subordinated Notes.



     (i)To adjust minority interest in income for the approximate 1.0% minority
        interest ownership in certain of Leviathan's subsidiaries and the 1.0%
        minority interest ownership in Viosca Knoll.



     (j)To adjust weighted average units outstanding for the 2,661,870 common
        units issued at the Closing Date.



     (k)To record transportation revenue, operating expenses and depreciation
        related to certain pipeline laterals acquired. The pipeline laterals
        will be depreciated on a straight-line basis over their estimated
        remaining useful lives of 5 years.



     (l)To record Leviathan's additional equity in earnings of HIOS and UTOS
        calculated as follows (in thousands). Since Leviathan's control of its
        investments in HIOS and UTOS is expected to be temporary, Leviathan will
        continue to use the equity method to account for these investments.



<TABLE>
<CAPTION>
                                                    SIX MONTHS
                                                  ENDED JUNE 30,        YEAR ENDED
                                                       1999          DECEMBER 31, 1998
                                                  ---------------    -----------------
                                                   HIOS     UTOS      HIOS       UTOS
                                                  ------    -----    -------    ------
<S>                                               <C>       <C>      <C>        <C>
     Net investee earnings......................  $8,498    $798     $19,983    $2,247
     Additional ownership interest..............      20%   33.3%         20%     33.3%
                                                  ------    -----    -------    ------
                                                   1,700     266       3,997       748
     Adjustment:
       Depreciation(1)..........................    (659)   (100)     (1,318)     (200)
                                                  ------    -----    -------    ------
     Equity in earnings.........................  $1,041    $166     $ 2,679    $  548
                                                  ======    =====    =======    ======
</TABLE>


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


         (1) Results from purchase price adjustments made in accordance with
             Accounting Principles Board Opinion No. 16, "Business
             Combinations." The purchase price of the HIOS/UTOS Transactions
             exceeded the fair value of net assets acquired by approximately
             $45.5 million. The excess cost has been preliminarily assigned to
             property and equipment and will be amortized on a straight-line
             basis over an estimated remaining life of 30 years.



     (m)To record additional equity in earnings of Stingray calculated as 50% of
        the net earnings related to certain laterals acquired by Stingray in
        connection with the HIOS/UTOS Transactions.



     (n)To record the management fee related to Leviathan's operation of the
        Related Facilities.



     (o)To adjust minority interest in income for the approximate 1.0% minority
        interest ownership in certain of Leviathan's subsidiaries.


                                      F-10
<PAGE>   158


             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES



                  CONDENSED CONSOLIDATED STATEMENTS OF INCOME


                    (IN THOUSANDS, EXCEPT PER UNIT AMOUNTS)


                                  (UNAUDITED)



<TABLE>
<CAPTION>
                                                             QUARTER            SIX MONTHS
                                                         ENDED JUNE 30,       ENDED JUNE 30,
                                                        -----------------   ------------------
                                                         1999      1998       1999      1998
                                                        -------   -------   --------   -------
<S>                                                     <C>       <C>       <C>        <C>
Revenue...............................................  $23,972   $18,373   $ 45,851   $36,087
                                                        -------   -------   --------   -------
Costs and expenses....................................
  Operating expenses..................................    2,431     2,708      5,025     5,546
  Depreciation, depletion and amortization............    7,009     6,978     13,727    14,845
  General and administrative expenses and management
     fee..............................................    2,779     2,554      5,909     7,503
                                                        -------   -------   --------   -------
                                                         12,219    12,240     24,661    27,894
                                                        -------   -------   --------   -------
Operating income......................................   11,753     6,133     21,190     8,193
Interest income and other.............................      165        73        268       157
Interest and other financing costs....................   (7,766)   (4,707)   (13,868)   (8,429)
Minority interest in income...........................      (43)      (16)       (80)       (3)
                                                        -------   -------   --------   -------
Income (loss) before income taxes.....................    4,109     1,483      7,510       (82)
Income tax benefit....................................       79        27        177       168
                                                        -------   -------   --------   -------
Net income............................................  $ 4,188   $ 1,510   $  7,687   $    86
                                                        =======   =======   ========   =======
Weighted average number of units outstanding..........   25,244    24,367     24,808    24,367
                                                        =======   =======   ========   =======
Basic and diluted net income per unit.................  $  0.13   $  0.05   $   0.25   $  0.00
                                                        =======   =======   ========   =======
</TABLE>



  The accompanying Notes are an integral part of these Condensed Consolidated
                             Financial Statements.

                                      F-11
<PAGE>   159


             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES



                     CONDENSED CONSOLIDATED BALANCE SHEETS


                                 (IN THOUSANDS)



                                     ASSETS



<TABLE>
<CAPTION>
                                                               JUNE 30,     DECEMBER 31,
                                                                 1999           1998
                                                              -----------   ------------
                                                              (UNAUDITED)
<S>                                                           <C>           <C>
Current assets
  Cash and cash equivalents.................................   $  3,301       $  3,108
  Accounts receivable.......................................      9,180          8,588
  Other current assets......................................        344            247
                                                               --------       --------
          Total current assets..............................     12,825         11,943
                                                               --------       --------
Equity investments (Notes 2 and 3)..........................    219,732        186,079
Property and equipment, net (Notes 2 and 4).................    381,210        241,992
Other noncurrent assets.....................................     12,146          2,712
                                                               --------       --------
          Total assets......................................   $625,913       $442,726
                                                               ========       ========

LIABILITIES AND PARTNERS' CAPITAL

Current liabilities
  Accounts payable and accrued liabilities..................   $ 12,475       $ 11,167
  Notes payable (Note 6)....................................         --        338,000
                                                               --------       --------
          Total current liabilities.........................     12,475        349,167
Notes payable (Note 6)......................................    306,500             --
Long-term debt (Note 6).....................................    175,000             --
Other noncurrent liabilities................................     12,151         11,661
                                                               --------       --------
          Total liabilities.................................    506,126        360,828
Commitments and contingencies
Minority interest...........................................       (249)          (998)
Partners' capital (Note 2)..................................    120,036         82,896
                                                               --------       --------
          Total liabilities and partners' capital...........   $625,913       $442,726
                                                               ========       ========
</TABLE>



  The accompanying Notes are an integral part of these Condensed Consolidated
                             Financial Statements.

                                      F-12
<PAGE>   160


             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES



                CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS


                                 (IN THOUSANDS)


                                  (UNAUDITED)



<TABLE>
<CAPTION>
                                                                   SIX MONTHS
                                                                 ENDED JUNE 30,
                                                              --------------------
                                                                1999        1998
                                                              ---------   --------
<S>                                                           <C>         <C>
Cash flows from operating activities
  Net income................................................  $   7,687   $     86
  Adjustments to reconcile net income to net cash provided
     by operating activities................................
     Depreciation, depletion and amortization...............     13,727     14,845
     Distributions from equity investees....................     24,108     13,298
     Equity in earnings.....................................    (19,953)   (12,571)
     Other noncash items....................................        721        509
  Working capital changes, net of effects of acquisitions...     (2,650)    (3,283)
                                                              ---------   --------
          Net cash provided by operating activities.........     23,640     12,884
                                                              ---------   --------
Cash flows from investing activities
  Additions to pipelines, platforms and facilities..........    (14,260)   (12,283)
  Investments in equity investees...........................     (4,393)    (4,543)
  Acquisition of additional interests in equity investees,
     net of cash received...................................    (51,128)        --
  Net cash flow impact of acquisition of Viosca Knoll.......    (19,856)        --
  Development of oil and natural gas properties.............     (3,181)    (2,540)
                                                              ---------   --------
          Net cash used in investing activities.............    (92,818)   (19,366)
                                                              ---------   --------
Cash flows from financing activities
  Proceeds from notes payable...............................     95,500     50,000
  Long-term debt issuance...................................    175,000         --
  Repayments of notes payable...............................   (160,350)   (18,000)
  Debt issuance costs.......................................    (10,126)        --
  Distributions to partners.................................    (31,256)   (30,806)
  General Partner's contribution............................        603         --
                                                              ---------   --------
          Net cash provided by financing activities.........     69,371      1,194
                                                              ---------   --------
Increase (decrease) in cash and cash equivalents............        193     (5,288)
Cash and cash equivalents
  Beginning of period.......................................      3,108      6,430
                                                              ---------   --------
  End of period.............................................  $   3,301   $  1,142
                                                              =========   ========
</TABLE>



Non-cash Investing Activities: See Note 2 for discussion.



  The accompanying Notes are an integral part of these Condensed Consolidated
                             Financial Statements.

                                      F-13
<PAGE>   161


             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES



                  CONSOLIDATED STATEMENT OF PARTNERS' CAPITAL


                                 (IN THOUSANDS)



<TABLE>
<CAPTION>
                                PREFERENCE   PREFERENCE    COMMON     COMMON       GENERAL
                                  UNITS      UNITHOLDERS   UNITS    UNITHOLDERS   PARTNER(A)       TOTAL
                                ----------   -----------   ------   -----------   ----------      --------
<S>                             <C>          <C>           <C>      <C>           <C>             <C>
Partners' capital at December
  31, 1998....................    1,017        $7,351      23,350    $ 90,972      $(15,427)      $ 82,896
Net income for the six months
  ended June 30, 1999
  (unaudited).................       --           131         --        6,098         1,458          7,687
Issuance of Common Units for
  acquisition of additional
  interest in Viosca Knoll
  (unaudited).................       --            --      2,662       59,792            --         59,792
General Partner contribution
  related to issuance of
  Common Units (unaudited)....       --            --         --           --           603            603
Cash distributions
  (unaudited).................       --          (559)        --      (24,517)       (5,866)       (30,942)
                                  -----        ------      ------    --------      --------       --------
Partners' capital at June 30,
  1999 (unaudited)............    1,017        $6,923      26,012    $132,345      $(19,232)(b)   $120,036
                                  =====        ======      ======    ========      ========       ========
</TABLE>



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



(a) Leviathan Gas Pipeline Company owns a 1% general partner interest in
    Leviathan.



(b) Pursuant to the terms of Leviathan's partnership agreement, no partner shall
    have any obligation to restore any negative balance in its capital account
    upon liquidation of Leviathan. Therefore, any net gains from the dissolution
    of Leviathan's assets would be allocated first to any then-outstanding
    deficit capital account balance before any of the remaining net proceeds
    would be distributed to the partners in accordance with their ownership
    percentages.



  The accompanying Notes are an integral part of these Condensed Consolidated
                             Financial Statements.

                                      F-14
<PAGE>   162


             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES



              NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS


                                  (UNAUDITED)



NOTE 1 -- ORGANIZATION AND BASIS OF PRESENTATION:



     Leviathan is a provider of integrated energy services, including natural
gas and oil gathering, transportation, midstream and other related services in
the Gulf. Through its subsidiaries and joint ventures, Leviathan owns interests
in significant assets, including (i) nine (eight existing and one under
construction) natural gas pipelines (the "Gas Pipelines"), (ii) two (one
existing and one under construction) oil pipeline systems, (iii) six
strategically-located multi-purpose platforms, (iv) production handling and
dehydration facilities, (v) four producing oil and natural gas properties and
(vi) a non-producing oil and natural gas property, the Ewing Bank 958 Unit,
comprised of Ewing Bank Blocks 958, 959, 1002 and 1003, formerly referred to as
the Sunday Silence property. The General Partner performs all management and
operational functions for Leviathan and its subsidiaries.



     As of June 30, 1999, Leviathan had 26,011,858 Common Units and 1,016,906
Preference Units outstanding. The public owns limited partner interests
representing an effective 65.5% interest in Leviathan, comprised of 1,016,906
Preference Units and 17,058,094 Common Units. El Paso Energy, through its
subsidiaries, owns an effective 34.5% economic interest in Leviathan, comprised
of a 32.5% limited partner interest in the form of 8,953,764 Common Units, its
1% general partner interest in Leviathan and its approximate 1% nonmanaging
member interest in certain subsidiaries of Leviathan.



     The 1998 Annual Report on Form 10-K for Leviathan includes a summary of
significant accounting policies and other disclosures and should be read in
conjunction with this Quarterly Report on Form 10-Q. The condensed consolidated
financial statements at June 30, 1999, and for the quarters and six months ended
June 30, 1999 and 1998 are unaudited. The condensed consolidated balance sheet
at December 31, 1998 is derived from audited consolidated financial statements
at that date. 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 United States Securities and Exchange
Commission. In the opinion of management, all material adjustments necessary to
present fairly the consolidated financial position and results of operations for
such periods have been included. All such adjustments are of a normal recurring
nature. Results of operations for any interim period are not necessarily
indicative of the results of operations for the entire year due to the seasonal
nature of Leviathan's businesses.



NOTE 2 -- ACQUISITIONS:



  Viosca Knoll



     In January 1999, Leviathan entered into a Contribution Agreement with EPFS
to acquire all of EPFS's interest in Viosca Knoll other than a 1% interest in
profits and capital of Viosca Knoll. At the time the Contribution Agreement was
executed, Leviathan and EPFS each beneficially owned a 50% interest in Viosca
Knoll, which was formed in 1994 to construct, own and operate an unregulated
gathering system designed to serve the Main Pass, Mississippi Canyon and Viosca
Knoll areas of the Gulf. The Viosca Knoll system is comprised of (i) an
approximately 94 mile, 20-inch diameter pipeline from a platform in Main Pass
Block 252 owned by Shell Offshore, Inc. to a pipeline owned by Tennessee Gas
Pipeline Company at South Pass Block 55 and (ii) a six mile 16-inch diameter
pipeline from an interconnection with the 20-inch diameter pipeline at
Leviathan's Viosca Knoll Block 817 platform to a pipeline owned by Southern
Natural Gas Company at Main Pass Block 289.



     Leviathan and EPFS closed the Viosca Knoll acquisition on June 1, 1999. In
connection therewith, (i) EPFS contributed to Viosca Knoll $33.4 million, which
amount was equal to 50% of the amount then outstanding under Viosca Knoll's
credit facility, (ii) a subsidiary of EPFS transferred a 49% interest in Viosca
Knoll to Leviathan, (iii) Leviathan paid to a subsidiary of EPFS $19.9 million
and issued to that subsidiary 2,661,870 Common Units, (iv) Leviathan paid other
closing costs of $0.8 million and (v) as


                                      F-15
<PAGE>   163

             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES



      NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)



required by Leviathan's Amended and Restated Agreement of Limited Partnership,
the General Partner contributed $0.6 million to Leviathan in order to maintain
its 1% capital account balance. In addition, during the six months commencing on
June 1, 2000, Leviathan has an option to acquire the remaining 1% interest in
profits and capital of Viosca Knoll for a cash payment equal to the sum of $1.6
million plus the amount of additional distributions (paid, payable or in
arrears) which would have been paid, accrued or been in arrears had Leviathan
acquired the remaining 1% of Viosca Knoll on June 1, 1999, by issuing additional
Common Units in lieu of a cash payment of $1.7 million. Leviathan used the
equity method of accounting for its 50% interest in Viosca Knoll through May 31,
1999. As a result of its acquisition of an additional 49% interest in Viosca
Knoll, Leviathan began consolidating Viosca Knoll as of June 1, 1999. The
acquisition of Viosca Knoll was accounted for as a purchase and the purchase
price was assigned to the assets and liabilities acquired based upon the
estimated fair value of those assets and liabilities as of the acquisition date.
The fair value of allocations are preliminary and may be revised after the
completion of an independent appraisal.



<TABLE>
<CAPTION>
                                                         (IN THOUSANDS)
<S>                                                      <C>
Fair value of assets acquired..........................     $ 83,061
Cash acquired..........................................          434
Fair value of liabilities assumed......................       (2,962)
                                                            --------
          Total purchase price.........................       80,533
Issuance of common units...............................      (59,792)
                                                            --------
          Net cash paid................................     $ 20,741
                                                            ========
</TABLE>



     The following selected unaudited pro forma information represents
Leviathan's consolidated results of operations on a pro forma basis for the six
month periods ended June 30, 1999 and 1998, assuming the Viosca Knoll
acquisition had occurred on January 1, 1998:



<TABLE>
<CAPTION>
                                                                SIX MONTHS ENDED
                                                                    JUNE 30,
                                                              ---------------------
                                                                1999        1998
                                                              ---------   ---------
                                                              (IN THOUSANDS, EXCEPT
                                                                PER UNIT AMOUNTS)
<S>                                                           <C>         <C>
Revenue.....................................................   $54,330     $46,021
Operating income............................................   $26,355     $14,334
Net income..................................................   $ 9,650     $ 3,005
Basic and diluted net income per unit.......................   $  0.29     $  0.09
</TABLE>



  HIOS/UTOS



     On June 30, 1999, subsidiaries of Leviathan acquired from Natural Gas
Pipeline Company of America ("NGPL"), a subsidiary of KN Energy, Inc., for total
consideration of approximately $51 million, net of cash received, (i) all of the
outstanding stock of two of NGPL's wholly-owned subsidiaries, Natoco, Inc.
("Natoco"), which owns a 20% member interest in Western Gulf, which in turn owns
100% of each of HIOS and East Breaks, and Naloco, Inc. (Del.) ("Naloco"), which
owns a 33.33% interest in UTOS, and (ii) NGPL's ownership interest in certain
lateral pipelines located in the Gulf. In addition, Leviathan will assume NGPL's
role as operator of Stingray, the Stingray Offshore Separation Facility and West
Cameron Dehydration Facility. Leviathan financed this acquisition with funds
borrowed under its $375 million revolving credit facility discussed in Note 6.
The purchase price exceeded the fair market value of net assets acquired by
approximately $48 million. This excess cost has been preliminary assigned to
property and equipment and is to be amortized on a straight line basis over 30
years. After giving effect to the acquisition, Leviathan owns a 60% interest in
Western Gulf, and thus an effective 60% interest in each of HIOS and East Breaks
and a 66.67% interest in UTOS. Since Leviathan's control is


                                      F-16
<PAGE>   164
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

      NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)


expected to be temporary, these investments will continue to be accounted for
under the equity method of accounting.



     Western Gulf was formed in December 1998 by Leviathan, NGPL and ANR
Pipeline Company ("ANR") as a holding company for HIOS and East Breaks. HIOS
consists of approximately 204 miles of pipeline comprised of three supply
laterals, the West, Central and East Laterals, that connect to a 42-inch
diameter mainline. The HIOS system was placed in service in 1977 and is used to
gather and transport natural gas produced from fields located in the Galveston,
Garden Banks, High Island, West Cameron and East Breaks areas of the Gulf to a
junction platform owned by HIOS located in West Cameron Block 167. The total
capacity of the HIOS system is approximately 1.8 Bcf of natural gas per day. ANR
operates the HIOS system. The East Breaks system is currently under
construction, with a design capacity of over 400 Mcf of natural gas per day, and
will initially consist of 85 miles of an 18 to 20-inch pipeline and related
facilities connecting the Diana/Hoover prospects developed by Exxon Company USA
("Exxon") and BP Amoco plc ("BP Amoco") in Alaminos Canyon Block 25, with the
HIOS system. The majority of the construction of the East Breaks system will
occur in 1999 and the system is anticipated to be in service by mid-2000 at an
estimated cost of approximately $90 million.



     Prior to June 30, 1999, UTOS was owned equally by Leviathan, NGPL and ANR.
The UTOS system was placed in service in 1978 and consists of approximately 30
miles of 42-inch diameter pipeline extending from a point of interconnection
with HIOS at West Cameron Block 167 to the Johnson Bayou processing facility in
southern Louisiana. The UTOS system transports natural gas from the terminus of
the HIOS system at West Cameron Block 167 to the Johnson Bayou facility, where
it interconnects with one intrastate and four interstate pipeline systems. UTOS
also owns the Johnson Bayou facility, which provides primarily natural gas and
liquids separation and natural gas dehydration for natural gas transported on
the HIOS and UTOS systems. ANR operates the UTOS system.



     The following selected unaudited pro forma information represents
Leviathan's consolidated results of operations on a pro forma basis for the six
month periods ended June 30, 1999 and 1998, assuming the HIOS/UTOS acquisition,
the acquisition of certain lateral pipelines and the effects of becoming the
operator of Stingray had occurred on January 1, 1998.



<TABLE>
<CAPTION>
                                                                SIX MONTHS ENDED
                                                                    JUNE 30,
                                                              --------------------
                                                                1999        1998
                                                              --------    --------
                                                              (IN THOUSANDS EXCEPT
                                                               PER UNIT AMOUNTS)
<S>                                                           <C>         <C>
Revenue.....................................................  $47,755     $38,485
Operating income............................................  $22,896     $10,392
Net income (loss)...........................................  $ 6,882     $  (230)
Basic and diluted net income (loss) per unit................  $  0.23     $ (0.01)
</TABLE>


                                      F-17
<PAGE>   165
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

      NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)


NOTE 3 -- EQUITY INVESTMENTS:



     Leviathan's ownership interest in each of the Equity Investees is included
in the summarized financial information that follows:



                    SUMMARIZED HISTORICAL OPERATING RESULTS


                         SIX MONTHS ENDED JUNE 30, 1999


                                 (IN THOUSANDS)


                                  (UNAUDITED)



<TABLE>
<CAPTION>
                                                                         WEST
                                                  VIOSCA                CAMERON              MANTA RAY
                             HIOS(A)   UTOS(A)   KNOLL(B)   STINGRAY     DEHY      POPCO    OFFSHORE(C)   NAUTILUS(C)    TOTAL
                             -------   -------   --------   --------    -------   -------   -----------   -----------   -------
<S>                          <C>       <C>       <C>        <C>         <C>       <C>       <C>           <C>           <C>
Operating revenue..........  $19,350   $2,119    $12,338    $ 9,068     $1,475    $36,217     $ 7,780       $ 4,453
Other income...............     118        33         31      1,105         13        191       1,144          (123)
Operating expenses.........  (8,649)   (1,074)      (925)    (5,569)      (142)    (3,814)     (1,997)         (698)
Depreciation...............  (2,321)     (280)    (1,752)    (3,800)        (8)    (2,301)     (2,523)       (2,964)
Interest expense...........      --        --     (1,973)      (858)        --     (4,220)        (18)         (182)
                             -------   -------   -------    -------     ------    -------     -------       -------
Net earnings (loss)........   8,498       798      7,719        (54)     1,338     26,073       4,386           486
Ownership percentage.......      40%     33.3%        50%        50%        50%        36%      25.67%        25.67%
                             -------   -------   -------    -------     ------    -------     -------       -------
                              3,399       266      3,860        (27)       669      9,386       1,126           125
Adjustments:
  Depreciation(d)..........     354        17         --        400         --        (60)       (174)           --
  Contract
    amortization(d)........     (53)       --         --         --         --         --          --            --
  Other....................      (2)        3         --        721(e)      --         --          --           (57)
                             -------   -------   -------    -------     ------    -------     -------       -------
Equity in earnings.........  $3,698    $  286    $ 3,860    $ 1,094     $  669    $ 9,326     $   952       $    68     $19,953
                             =======   =======   =======    =======     ======    =======     =======       =======     =======
Distributions(f)...........  $4,200    $  333    $ 6,350    $ 2,501     $  550    $ 7,463     $ 1,954       $   757     $24,108
                             =======   =======   =======    =======     ======    =======     =======       =======     =======
</TABLE>


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


(a)  As a result of restructuring the joint venture arrangement in December
     1998, the partners of HIOS, (i) created a holding company, Western Gulf,
     (ii) converted the HIOS Delaware partnership into a limited liability
     company and (iii) formed East Breaks. HIOS owns a regulated natural gas
     system, and East Breaks is currently constructing an unregulated natural
     gas system. Leviathan believes the disclosure of separate financial data
     for HIOS and East Breaks is more meaningful than the consolidated results
     of Western Gulf. East Breaks has had only construction activity since its
     inception. On June 30, 1999, Leviathan acquired additional interests in
     HIOS, East Breaks and UTOS (see Note 2). As a result of the additional
     interests acquired, Leviathan owns an effective 60% interest in each of
     HIOS and East Breaks and a 66.7% interest in UTOS.



(b)  The information presented for Viosca Knoll as an equity investment is
     through May 31, 1999. On June 1, 1999, Leviathan began consolidating the
     results of Viosca Knoll as a result of acquiring an additional 49% interest
     in Viosca Knoll (see Note 2).



(c)  Leviathan owns a 25.67% interest in each of Neptune and Ocean Breeze, which
     together own 100% of the member interests in each of Manta Ray Offshore,
     which owns an unregulated natural gas system, and Nautilus, which owns a
     regulated natural gas system. Leviathan believes the disclosure of separate
     financial data for Manta Ray Offshore and Nautilus is more meaningful than
     the consolidated results of Neptune and Ocean Breeze.



(d)  Adjustments result from purchase price adjustments made in accordance with
     Accounting Principles Board ("APB") Opinion No. 16, "Business
     Combinations."



(e)  Adjustments primarily resulting from changes in prior period estimates of
     reserves for uncollectible revenue.



(f)  Future distributions are at the discretion of the Equity Investees'
     management committees and could further be restricted by the terms of the
     Equity Investees' respective credit agreements.


                                      F-18
<PAGE>   166

             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES



      NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)



                    SUMMARIZED HISTORICAL OPERATING RESULTS


                         SIX MONTHS ENDED JUNE 30, 1998


                                 (IN THOUSANDS)


                                  (UNAUDITED)



<TABLE>
<CAPTION>
                                                                      WEST
                                                VIOSCA               CAMERON              MANTA RAY
                             HIOS      UTOS      KNOLL    STINGRAY    DEHY      POPCO    OFFSHORE(A)   NAUTILUS(A)    TOTAL
                            -------   -------   -------   --------   -------   -------   -----------   -----------   -------
<S>                         <C>       <C>       <C>       <C>        <C>       <C>       <C>           <C>           <C>
Operating revenue.........  $21,730   $ 2,384   $14,746   $11,620    $1,191    $19,517     $ 5,234       $ 1,289
Other income..............      134        57        23       434         2        145         184            17
Operating expenses........   (8,632)   (1,260)   (1,263)   (7,611)      (84)    (1,960)     (1,533)         (678)
Depreciation..............   (2,384)     (279)   (1,893)   (3,489)       (7)    (4,392)     (2,129)       (2,890)
Interest expense..........       --        --    (1,989)   (1,069)       --     (4,396)         --           (12)
                            -------   -------   -------   -------    ------    -------     -------       -------
Net earnings (loss).......   10,848       902     9,624      (115)    1,102      8,914       1,756        (2,274)
Ownership percentage......       40%     33.3%       50%       50%       50%        36%      25.67%        25.67%
                            -------   -------   -------   -------    ------    -------     -------       -------
                              4,339       301     4,812       (58)      551      3,209         451          (584)
Adjustments:
  Depreciation(b).........      379        16        --       406        --         --        (174)           --
  Contract
    amortization(b).......      (53)       --        --      (122)       --         --          --            --
  Other...................      (69)       16        --       (24)       --        (60)         --          (765)(c)
                            -------   -------   -------   -------    ------    -------     -------       -------
  Equity in earnings
    (loss)................  $ 4,596   $   333   $ 4,812   $   202    $  551    $ 3,149     $   277       $(1,349)    $12,571
                            =======   =======   =======   =======    ======    =======     =======       =======     =======
  Distributions...........  $ 5,240   $   333   $ 5,800   $ 1,000    $  425    $    --     $   500       $    --     $13,298
                            =======   =======   =======   =======    ======    =======     =======       =======     =======
</TABLE>



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



(a)  Leviathan owns a 25.67% interest in each of Neptune and Ocean Breeze, which
     together own 100% of the member interests in each of Manta Ray Offshore,
     which owns an unregulated natural gas system, and Nautilus, which owns a
     regulated natural gas system. Leviathan believes the disclosure of separate
     financial data for Manta Ray Offshore and Nautilus is more meaningful than
     the consolidated results of Neptune and Ocean Breeze.



(b)  Adjustments result from purchase price adjustments made in accordance with
     APB Opinion No. 16.



(c)  Primarily relates to a revision of the allowance for funds used during
     construction ("AFUDC") which represents the estimated costs, during the
     construction period, of funds used for construction purposes.



NOTE 4 -- PROPERTY AND EQUIPMENT:



     Property and equipment consist of the following (in thousands):



<TABLE>
<CAPTION>
                                                               JUNE 30,     DECEMBER 31,
                                                                 1999           1998
                                                              -----------   ------------
                                                              (UNAUDITED)
<S>                                                           <C>           <C>
Property and equipment, at cost
  Pipelines.................................................   $ 79,313       $ 64,464
  Platforms and facilities..................................    271,049        123,912
  Oil and natural gas properties, at cost, using successful
     efforts method.........................................    155,931        152,750
                                                               --------       --------
                                                                506,293        341,126
Less accumulated depreciation, depletion, amortization and
  impairment................................................    125,083         99,134
                                                               --------       --------
          Property and equipment, net.......................   $381,210       $241,992
                                                               ========       ========
</TABLE>


                                      F-19
<PAGE>   167

             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES



      NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)



NOTE 5 -- BUSINESS SEGMENT INFORMATION:



     The following table summarizes certain financial information for each
business segment (in thousands):



<TABLE>
<CAPTION>
                            GATHERING,
                          TRANSPORTATION
                           AND PLATFORM      OIL AND       EQUITY                 ELIMINATIONS
                             SERVICES      NATURAL GAS   INVESTMENTS   SUBTOTAL    AND OTHER      TOTAL
                          --------------   -----------   -----------   --------   ------------   --------
<S>                       <C>              <C>           <C>           <C>        <C>            <C>
QUARTER ENDED JUNE 30,
  1999:
  Revenue from external
     customers..........     $  6,425        $ 8,295      $  9,252     $ 23,972     $    --      $ 23,972
  Intersegment
     revenue............        3,136             --            --        3,136      (3,136)           --
  Depreciation,
     depletion and
     amortization.......       (2,323)        (4,686)           --       (7,009)         --        (7,009)
  Operating income
     (loss).............        4,632         (1,177)        8,298       11,753          --        11,753
  Net cash flows........        6,956          3,508        13,064       23,528          --        23,528
  Segment assets........      310,609         77,871       222,038      610,518      15,395       625,913
QUARTER ENDED JUNE 30,
  1998:
  Revenue from external
     customers..........     $  4,522        $ 6,599      $  7,252     $ 18,373     $    --      $ 18,373
  Intersegment
     revenue............        2,486             --            --        2,486      (2,486)           --
  Depreciation,
     depletion and
     amortization.......       (1,903)        (5,075)           --       (6,978)         --        (6,978)
  Operating income
     (loss).............        2,700         (3,061)        6,494        6,133          --         6,133
  Net cash flows........        4,603          2,014         6,215       12,832          --        12,832
  Segment assets........      143,340         58,662       188,530      390,532      15,555       406,087
SIX MONTHS ENDED JUNE
  30, 1999:
  Revenue from external
     customers..........     $ 10,798        $15,100      $ 19,953     $ 45,851     $    --      $ 45,851
  Intersegment
     revenue............        6,010             --            --        6,010      (6,010)           --
  Depreciation,
     depletion and
     amortization.......       (4,243)        (9,484)           --      (13,727)         --       (13,727)
  Operating income
     (loss).............        7,642         (4,043)       17,591       21,190          --        21,190
  Net cash flows........       11,885          5,441        21,746       39,072          --        39,072
  Segment assets........      310,609         77,871       222,038      610,518      15,395       625,913
SIX MONTHS ENDED JUNE
  30, 1998:
  Revenue from external
     customers..........     $  7,782        $15,734      $ 12,571     $ 36,087     $    --      $ 36,087
  Intersegment
     revenue............        5,075             --            --        5,075      (5,075)           --
  Depreciation,
     depletion and
     amortization.......       (3,519)       (11,326)           --      (14,845)         --       (14,845)
  Operating income
     (loss).............        3,129         (5,109)       10,173        8,193          --         8,193
  Net cash flows........        6,648          6,217        10,900       23,765          --        23,765
  Segment assets........      143,340         58,662       188,530      390,532      15,555       406,087
</TABLE>


                                      F-20
<PAGE>   168

             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES



      NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)



NOTE 6 -- FINANCING TRANSACTIONS:



  Senior Subordinated Notes



     Leviathan entered into an indenture dated May 27, 1999 with Chase Bank of
Texas, National Association, pursuant to which it issued $175 million in
aggregate principal amount of Senior Subordinated Notes (along with the
indenture, the "Subordinated Notes"). Leviathan capitalized $5.2 million of debt
issue costs related to the issuance of the Subordinated Notes. Approximately
$19.9 million of the proceeds were used to consummate the Viosca Knoll
acquisition (see Note 2), $33.4 million were contributed to Viosca Knoll to
repay the remaining unpaid balance of the Viosca Knoll credit facility, and the
remaining proceeds were used to reduce the balance outstanding of and to extend
Leviathan's revolving credit facility (discussed below).



     The Subordinated Notes bear interest at a rate of 10 3/8% per annum,
payable semi-annually, on June 1 and December 1, mature on June 1, 2009 and are
junior to substantially all of Leviathan's other indebtedness other than trade
payables and indebtedness that by its terms expressly states it is equal or
junior to the Subordinated Notes. Generally, Leviathan does not have the right
to prepay the Subordinated Notes prior to May 31, 2004 and thereafter, Leviathan
may prepay the Subordinated Notes at a premium of 5% of the face amount, which
premium declines ratably through maturity. Although the Subordinated Notes are
unsecured, all of Leviathan's subsidiaries have guaranteed those obligations.
The Subordinated Notes contain customary terms and conditions, including various
affirmative and negative covenants and the obligation to offer to repurchase the
notes at a premium under certain circumstances. Among other things, the terms of
the Subordinated Notes limit Leviathan's ability to make distributions to its
unitholders, redeem or otherwise reacquire any of its equity, incur additional
indebtedness, incur or permit to exist certain liens, make additional
investments, engage in transactions with affiliates, engage in certain types of
businesses and dispose of assets under certain circumstances, including if
certain financial tests are not satisfied or there is a default. In addition,
Leviathan will be obligated to offer to repurchase the Subordinated Notes if it
experiences certain types of changes of control or if it disposes of certain
assets and does not reinvest the proceeds or repay senior indebtedness. Also,
Leviathan agreed to file a registration statement for an offer to exchange the
Subordinated Notes for debt securities with identical terms and to complete the
registered exchange offer within 180 days after June 1, 1999.



  Leviathan Credit Facility



     Concurrent with the closing of the offering of the Subordinated Notes,
Leviathan amended and restated its $375 million credit facility (the "Leviathan
Credit Facility") to, among other things, extend its maturity from December 1999
to May 2002. Leviathan incurred approximately $3.0 million related to the
amendment and restatement of the credit facility. The Leviathan Credit Facility,
as amended, is a revolving credit facility with a syndicate of commercial banks
providing for up to $375 million of available credit, subject to customary terms
and conditions, including certain limitations on incurring additional
indebtedness (including borrowings under this facility) if certain financial
targets are not achieved and maintained. In addition, Leviathan will be required
to prepay a portion of the balance outstanding under this credit facility to the
extent such financial targets are not achieved and maintained. Funds borrowed
under the Leviathan Credit Facility are available to Leviathan for general
partnership purposes, including financing capital expenditures, working capital
requirements and, subject to certain limitations, distributions to the
unitholders. The Leviathan Credit Facility can also be utilized to issue letters
of credit as may be required from time to time; however, no letters of credit
are currently outstanding. The Leviathan Credit Facility, as amended, matures in
May 2002; is guaranteed by the General Partner and each of Leviathan's
subsidiaries; and is collateralized by (i) the management agreement between the
General Partner and a subsidiary of El Paso Energy, (ii) substantially all of
the assets of Leviathan and its subsidiaries and (iii) the General Partner's 1%
general partner interest in Leviathan and approximate 1% nonmanaging


                                      F-21
<PAGE>   169

             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES



      NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)



member interest in certain subsidiaries of Leviathan. The Leviathan Credit
Facility has no scheduled amortization prior to maturity. As of June 30, 1999,
Leviathan had $306.5 million outstanding under its credit facility bearing
interest at an average floating rate of 7.5% per annum.



NOTE 7 -- PARTNERS' CAPITAL INCLUDING CASH DISTRIBUTIONS:



  Cash distributions



     Leviathan paid cash distributions of $0.275 per Preference Unit and $0.525
per Common Unit for each of the three months ended December 31, 1998 and March
31, 1999 in February 1999 and May 1999, respectively. As a result, the General
Partner received incentive distributions of $5.6 million for the six months
ended June 30, 1999. On July 19, 1999, Leviathan declared a cash distribution of
$0.275 per Preference Unit and $0.525 per Common Unit for the three months ended
June 30, 1999 which was paid on August 13, 1999, to all holders of record of
Common Units and Preference Units as of July 30, 1999. The General Partner was
paid an incentive distribution of $3.2 million for the quarter ended June 30,
1999. At the current distribution rates, the General Partner receives
approximately 19% of total cash distributions paid by Leviathan and is thus
allocated approximately 19% of Leviathan's net income.



  Conversion of Preference Units into Common Units



     On May 14, 1999, Leviathan notified the holders of its 1,016,906 then
outstanding Preference Units of their opportunity to submit their Preference
Units for conversion into an equal number of Common Units during a 90-day
period. During the conversion period, 725,607 Preference Units were converted
into an equal number of Common Units. The remaining 291,299 Preference Units
will retain their distribution preferences over the Common Units; that is, no
Common Unitholder or the General Partner will receive any quarterly distribution
until each Preference Unitholder has received the minimum quarterly distribution
of $0.275 per unit plus any arrearages. Holders of the Common Units and the
General Partner are entitled to distributions in excess of $0.275 per unit.
Preference Units are not entitled to any such excess distributions.



     Holders of Preference Units will have a third and final conversion
opportunity in May 2000. Thereafter, any remaining Preference Units may, in
certain circumstances, be subject to mandatory redemption at below market
trading prices. Further, following this most recent conversion opportunity
period, the Preference Units may no longer meet New York Stock Exchange minimum
listing requirements and may be delisted.


                                      F-22
<PAGE>   170

             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES



      NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)



NOTE 8 -- NET INCOME PER UNIT:



     Basic and diluted net income per unit is calculated based upon the net
income of Leviathan less an allocation of net income to the General Partner
proportionate to its share of cash distributions and is presented below for the
quarters and six months ended June 30, 1999 and 1998 (in thousands).



<TABLE>
<CAPTION>
                                                            QUARTER ENDED JUNE 30,
                                           ---------------------------------------------------------
                                                      1999                          1998
                                           ---------------------------   ---------------------------
                                           LIMITED    GENERAL            LIMITED    GENERAL
                                           PARTNERS   PARTNER   TOTAL    PARTNERS   PARTNER   TOTAL
                                           --------   -------   ------   --------   -------   ------
<S>                                        <C>        <C>       <C>      <C>        <C>       <C>
Net income(a)............................   $4,146    $   42    $4,188    $1,495     $ 15     $1,510
Allocation to General Partner(b).........     (753)      753        --      (277)     277         --
                                            ------    ------    ------    ------     ----     ------
Allocation of net income as adjusted for
  incentive distributions................   $3,393    $  795    $4,188    $1,218     $292     $1,510
                                            ======    ======    ======    ======     ====     ======
Weighted average number of units
  outstanding(c).........................   25,244                        24,367
                                            ======                        ======
Basic and diluted net income per unit....   $ 0.13                        $ 0.05
                                            ======                        ======
</TABLE>



<TABLE>
<CAPTION>
                                                           SIX MONTHS ENDED JUNE 30,
                                           ---------------------------------------------------------
                                                      1999                          1998
                                           ---------------------------   ---------------------------
                                           LIMITED    GENERAL            LIMITED    GENERAL
                                           PARTNERS   PARTNER   TOTAL    PARTNERS   PARTNER   TOTAL
                                           --------   -------   ------   --------   -------   ------
<S>                                        <C>        <C>       <C>      <C>        <C>       <C>
Net income(a)............................  $ 7,610    $   77    $7,687    $   85     $  1     $   86
Allocation to General Partner(b).........   (1,382)    1,382        --       (16)      16         --
                                           -------    ------    ------    ------     ----     ------
Allocation of net income as adjusted for
  incentive distributions................  $ 6,228    $1,459    $7,687    $   69     $ 17     $   86
                                           =======    ======    ======    ======     ====     ======
Weighted average number of units
  outstanding(c).........................   24,808                        24,367
                                           =======                        ======
Basic and diluted net income per unit....  $  0.25                        $ 0.00
                                           =======                        ======
</TABLE>



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



(a)  Net income is initially allocated 99% to the limited partners as holders of
     the Preference and Common Units and 1% to the General Partner (see (b)).



(b)  Represents allocation of net income to the General Partner proportionate to
     its share of each quarter's cash distributions which included incentive
     distributions (see Note 7).



(c)  Diluted weighted average number of units outstanding for 1999 is less than
     1,000 units higher than basic weighted average units outstanding as a
     result of unit options included in the diluted weighted average.



NOTE 9 -- RELATED PARTY TRANSACTIONS:



  Management fees



     Leviathan's partnership agreement provides for reimbursement of expenses
incurred by the General Partner, including reimbursement of expenses incurred by
El Paso Energy in providing management services to Leviathan, its subsidiaries
and the General Partner. The General Partner charged Leviathan $2.3 million,
$2.1 million, $4.7 million and $4.6 million for the quarters and six months
ended June 30, 1999 and 1998, respectively.


                                      F-23
<PAGE>   171

             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES



      NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)



NOTE 10 -- COMMITMENTS AND CONTINGENCIES:



     Leviathan may utilize derivative financial instruments for purposes other
than trading to manage its exposure to movements in interest rates and commodity
prices. In accordance with procedures established by Leviathan's Board of
Directors, Leviathan monitors current economic conditions and evaluates its
expectations of future prices and interest rates when making decisions with
respect to risk management.



  Interest Rate Risk



     Leviathan utilizes both fixed and variable rate long-term debt. Leviathan
is exposed to some market risk due to the floating interest rate under its
credit facility. Under the Leviathan Credit Facility, as amended, the remaining
principal and the final interest payment are due in May 2002. As of August 9,
1999, Leviathan's credit facility had a principal balance of $300 million at an
average floating interest rate of 7.7% per annum. A 1.5% increase in interest
rates could result in a $4.5 million annual increase in interest expense on the
existing principal balance. Leviathan is exposed to similar risk under the
credit facilities and loan agreements entered into by its joint ventures.
Leviathan has determined that it is not necessary to participate in interest
rate-related derivative financial instruments because it currently does not
expect significant short-term increases in the interest rates charged under its
credit facility or the various joint venture credit facilities and loan
agreements.



  Commodity Price Risk



     Leviathan hedges a portion of its oil and natural gas production to reduce
its exposure to fluctuations in the market prices thereof. Leviathan uses
commodity price swap transactions whereby monthly settlements are based on
differences between the prices specified in the commodity price swap agreements
and the settlement prices of certain futures contracts quoted on the NYMEX or
certain other indices. Leviathan settles the commodity price swap transactions
by paying the negative difference or receiving the positive difference between
the applicable settlement price and the price specified in the contract. The
commodity price swap transactions Leviathan uses differ from futures contracts
in that there are no contractual obligations which require or allow for the
future delivery of the product. The credit risk from Leviathan's price swap
contracts is derived from the counterparty to the transaction, typically a major
financial institution. Leviathan does not require collateral and does not
anticipate nonperformance by this counterparty, which does not transact a
sufficient volume of transactions with Leviathan to create a significant
concentration of credit risk. Gains or losses resulting from hedging activities
and the termination of any hedging instruments are initially deferred and
included as an increase or decrease to oil and natural gas sales in the period
in which the hedged production is sold. For the quarter and six months ended
June 30, 1999 and 1998, Leviathan recorded a net gain (loss) of $(0.4) million,
$0.6 million, $(0.7) million and $1.4 million, respectively, related to hedging
activities.



     As of June 30, 1999, Leviathan has open sales swap transactions for 10,000
MMbtu of natural gas per day for calendar 2000 at a fixed price to be determined
at its option equal to the February 2000 Natural Gas Futures Contract on the
NYMEX as quoted at any time during 1999 and January 2000, to and including the
last two trading days of the February 2000 contract, minus $0.5450 per MMbtu.
Additionally, Leviathan has open sales swap transactions of 10,000 MMbtu of
natural gas per day at a fixed price to be determined at its option equal to the
January 2000 Natural Gas Futures Contract on NYMEX as quoted at any time during
1999, to and including the last two trading days of the January 2000 contract,
minus $0.50 per MMbtu.



     At June 30, 1999, Leviathan had open crude oil hedges on approximately 500
barrels per day for the remainder of calendar 1999 at an average price of $16.10
per barrel.


                                      F-24
<PAGE>   172

             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES



      NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)



     If Leviathan had settled its open oil and natural gas hedging positions as
of June 30, 1999, based on the applicable settlement prices of the NYMEX futures
contracts, Leviathan would have recognized a loss of approximately $2.2 million.



  Other



     Leviathan is involved from time to time in various claims, actions,
lawsuits and regulatory matters that have arisen in the ordinary course of
business, including various rate cases and other proceedings before the Federal
Energy Regulatory Commission.



     Leviathan and several subsidiaries of El Paso Energy have been made
defendants in actions brought by Jack Grynberg on behalf of the United States
Government under the false claims act. Generally, the 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, thereby depriving the
United States Government of royalties. In April 1999, the U.S. Government filed
a notice that it does not intend to intervene in these actions. Grynberg has
petitioned the Multidistrict Litigation Panel ("MLP") for consolidation of
pre-trial matters. The MLP will not consider this matter until September 1999.
Leviathan and El Paso Energy believe the complaint is without merit, and
therefore, will not have a material adverse effect on Leviathan's consolidated
financial position, results of operations or cash flows.



     Leviathan is a defendant in a lawsuit filed by Transco Gas Pipe Line
Corporation ("Transco") in the 157th Judicial District Court, Harris County,
Texas on August 30, 1996. Transco alleges that, pursuant to a platform lease
agreement entered into on June 28, 1994, Transco has the right to expand its
facilities and operations on the offshore platform by connecting additional
pipeline receiving and appurtenant facilities. Management has denied Transco's
request to expand its facilities and operations because the lease agreement does
not provide for such expansion and because Transco's activities will interfere
with the Manta Ray Offshore system and Leviathan's existing and planned
activities on the platform. Transco has requested a declaratory judgment and is
seeking damages. The case is set for trial in November 1999. It is the opinion
of management that adequate defenses exist and that the final disposition of
this suit will not have a material adverse effect on Leviathan's consolidated
financial position, results of operations or cash flows.



     Leviathan is a named defendant in several lawsuits and a named party in
several governmental proceedings arising in the ordinary course of business.
While the outcome of such lawsuits or other proceedings against Leviathan cannot
be predicted with certainty, management currently does not expect these matters
to have a material adverse effect on Leviathan's consolidated financial
position, results of operations or cash flows.



NOTE 11 -- NEW ACCOUNTING PRONOUNCEMENT NOT YET ADOPTED:



     In June 1998, Statement of Financial Accounting Standards ("SFAS") No. 133,
Accounting for Derivative Instruments and Hedging Activities, was issued by the
Financial Accounting Standards Board to establish accounting and reporting
standards for derivative instruments, including certain derivative instruments
embedded in other contracts, and for hedging activities. SFAS No. 133 requires
that entities recognize all derivative investments as either assets or
liabilities on the balance sheet and measure those instruments at fair value.
Changes in the fair value of derivatives are recorded each period in current
earnings or other comprehensive income, depending on whether a derivative is
designated as a hedge transaction. For fair-value hedge transactions in which
Leviathan is hedging changes in an asset's, liability's or firm commitment's
fair value, changes in the fair value of the derivative instrument will
generally be offset in the income statement by changes in the hedged item's fair
value. For cash-flow hedge transactions in which Leviathan is hedging the
variability of cash flows related to a variable-rate asset, liability, or a
forecasted transaction, changes in the fair value of the derivative instrument
will be

                                      F-25
<PAGE>   173

             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES



      NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)



reported in other comprehensive income. The gains and losses on the derivative
instrument that are reported in other comprehensive income will be reclassified
as earnings in the periods in which earnings are impacted by the variability of
the cash flows of the hedged item. The ineffective portion of all hedges will be
recognized in current-period earnings. This statement was amended by SFAS No.
137 issued in June 1999. The amendment defers the effective date of SFAS No. 133
to fiscal years beginning after June 15, 2000. Leviathan is currently evaluating
the effects of this pronouncement.



NOTE 12 -- SUBSEQUENT EVENTS:



     In August 1999, Leviathan and Tejas Energy, L.L.C. ("Tejas") formed Nemo
Gathering Company, LLC ("Nemo") to build a new pipeline (the "Nemo Pipeline") to
gather natural gas from the deepwater region of the Gulf.



     Nemo, owned 66.08% by Tejas and 33.92% by Leviathan, has entered into a gas
gathering agreement with Shell Deepwater Development Inc. ("Shell") and will
construct a 24-mile, 20-inch gas gathering line connecting Shell's planned
Brutus development with the existing Manta Ray Offshore Gathering System. Gas
production from the Brutus development is expected to commence in late 2001.
Tejas will operate the line once it is constructed.



     Shell plans to install a tension leg platform to develop its Brutus
discovery at Green Canyon Block 158 in 2,980 feet of water. The Nemo Pipeline
will interconnect with the Manta Ray Offshore Gathering System at Leviathan's
platform located in Ship Shoal Block 332.


                                      F-26
<PAGE>   174

                       REPORT OF INDEPENDENT ACCOUNTANTS

To the Unitholders of Leviathan Gas Pipeline Partners, L.P.
  and the Board of Directors and Stockholder of
  Leviathan Gas Pipeline Company, as General Partner

     In our opinion, the accompanying consolidated balance sheet and related
consolidated statements of operations, of cash flows and of partners' capital
present fairly, in all material respects, the financial position of Leviathan
Gas Pipeline Partners, L.P. and its subsidiaries ("Leviathan") at December 31,
1998 and 1997 and the results of their operations and their cash flows for each
of the three years in the period ended December 31, 1998 in conformity with
generally accepted accounting principles. These financial statements are the
responsibility of Leviathan's management; our responsibility is to express an
opinion on these financial statements based on our audits. We conducted our
audits of these statements in accordance with generally accepted auditing
standards which require that we plan and perform the audit to obtain reasonable
assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements, assessing the
accounting principles used and significant estimates made by management, and
evaluating the overall financial statement presentation. We believe that our
audits provide a reasonable basis for the opinion expressed above.

                                          PricewaterhouseCoopers LLP

Houston, Texas
March 19, 1999

                                      F-27
<PAGE>   175

             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

                           CONSOLIDATED BALANCE SHEET
                                 (In thousands)

<TABLE>
<CAPTION>
                                                                  DECEMBER 31,
                                                              --------------------
                                                                1998        1997
                                                              --------    --------
<S>                                                           <C>         <C>
                           ASSETS
Current assets:
  Cash and cash equivalents.................................  $  3,108    $  6,430
  Accounts receivable.......................................     1,482       1,953
  Accounts receivable from affiliates.......................     7,106       6,608
  Other current assets......................................       247         653
                                                              --------    --------
          Total current assets..............................    11,943      15,644
                                                              --------    --------
Equity investments..........................................   186,079     182,301
                                                              --------    --------
Property and equipment:
  Pipelines.................................................    64,464      78,617
  Platforms and facilities..................................   123,912      97,509
  Oil and natural gas properties, at cost, using successful
     efforts method.........................................   152,750     120,296
                                                              --------    --------
                                                               341,126     296,422
  Less accumulated depreciation, depletion, amortization and
     impairment.............................................    99,134      95,783
                                                              --------    --------
     Property and equipment, net............................   241,992     200,639
                                                              --------    --------
Investment in Tatham Offshore, Inc. (Notes 1 and 8).........        --       7,500
Other noncurrent assets.....................................     2,712       3,758
                                                              --------    --------
          Total assets......................................  $442,726    $409,842
                                                              ========    ========
LIABILITIES AND PARTNERS' CAPITAL
Current liabilities:
  Accounts payable and accrued liabilities..................  $ 10,429    $ 12,522
  Accounts payable to affiliates............................       738       1,032
  Notes payable.............................................   338,000          --
                                                              --------    --------
          Total current liabilities.........................   349,167      13,554
Deferred federal income taxes...............................       937       1,399
Notes payable...............................................        --     238,000
Other noncurrent liabilities................................    10,724      13,304
                                                              --------    --------
          Total liabilities.................................   360,828     266,257
                                                              --------    --------

Commitments and contingencies

Minority interest...........................................      (998)       (381)
                                                              --------    --------
Partners' capital:
  Preference unitholders' interest..........................     7,351     163,426
  Common unitholders' interest..............................    90,972     (15,400)
  General Partner's interest................................   (15,427)     (4,060)
                                                              --------    --------
                                                                82,896     143,966
                                                              --------    --------
          Total liabilities and partners' capital...........  $442,726    $409,842
                                                              ========    ========
</TABLE>

    The accompanying notes are an integral part of this financial statement.
                                      F-28
<PAGE>   176

             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

                      CONSOLIDATED STATEMENT OF OPERATIONS
                    (In thousands, except per Unit amounts)

<TABLE>
<CAPTION>
                                                                  YEAR ENDED DECEMBER 31,
                                                              -------------------------------
                                                                1998        1997       1996
                                                              --------    --------    -------
<S>                                                           <C>         <C>         <C>
Revenue:
  Oil and natural gas sales.................................  $    186    $    276    $   772
  Oil and natural gas sales to affiliates...................    31,225      57,830     46,296
  Gathering, transportation and platform services...........    13,924      10,029     13,974
  Gathering, transportation and platform services to
     affiliates.............................................     3,396       7,300     10,031
  Equity in earnings........................................    26,724      29,327     20,434
                                                              --------    --------    -------
                                                                75,455     104,762     91,507
                                                              --------    --------    -------
Costs and expenses:
  Operating expenses........................................    11,369      11,352      9,068
  Depreciation, depletion and amortization..................    29,267      46,289     31,731
  Impairment, abandonment and other.........................    (1,131)     21,222         --
  General and administrative expenses.......................     6,416       5,869        788
  Management fee and general and administrative expenses
     allocated from General Partner.........................     9,773       8,792      7,752
                                                              --------    --------    -------
                                                                55,694      93,524     49,339
                                                              --------    --------    -------

Operating income............................................    19,761      11,238     42,168
Interest income and other...................................       771       1,475      1,710
Interest and other financing costs..........................   (20,242)    (14,169)    (5,560)
Minority interest in (income) loss..........................       (15)          7       (427)
                                                              --------    --------    -------
Income (loss) before income taxes...........................       275      (1,449)    37,891
Income tax benefit..........................................       471         311        801
                                                              --------    --------    -------
Net income (loss)...........................................  $    746    $ (1,138)   $38,692
                                                              ========    ========    =======
Weighted average number of units outstanding................    24,367      24,367     24,367
                                                              ========    ========    =======
Basic and diluted net income (loss) per unit (Note 2).......  $   0.02(a) $  (0.06)   $  1.57
                                                              ========    ========    =======
</TABLE>

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

(a) Excludes 933,000 outstanding unit options to purchase an equal number of
    Common Units of Leviathan as the exercise prices of the unit options were
    greater than the average market price of the Common Units (Note 7).

    The accompanying notes are an integral part of this financial statement.
                                      F-29
<PAGE>   177

             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

                      CONSOLIDATED STATEMENT OF CASH FLOWS
                                 (In thousands)

<TABLE>
<CAPTION>
                                                                 YEAR ENDED DECEMBER 31,
                                                            ---------------------------------
                                                              1998        1997        1996
                                                            --------    --------    ---------
<S>                                                         <C>         <C>         <C>
Cash flows from operating activities:
  Net income (loss).......................................  $    746    $ (1,138)   $  38,692
  Adjustments to reconcile net income (loss) to net cash
     provided by operating activities:
      Amortization of debt issue costs....................     2,128         960        1,351
      Depreciation, depletion and amortization............    29,267      46,289       31,731
      Impairment, abandonment and other...................    (1,131)     21,222           --
      Minority interest in income (loss)..................        15          (7)         427
      Equity in earnings..................................   (26,724)    (29,327)     (20,434)
      Distributions from equity investments...............    31,171      27,135       36,823
      Deferred income taxes and other.....................      (462)       (323)        (936)
      Other noncash items.................................      (310)     (1,596)      (6,560)
      Changes in operating working capital:
        Decrease (increase) in accounts receivable........       471       4,284       (3,442)
        (Increase) decrease in accounts receivable from
           affiliates.....................................      (498)      7,499       (7,512)
        Decrease (increase) in other current assets.......       406         206          (97)
        Decrease in accounts payable and accrued
           liabilities....................................    (9,108)     (5,247)     (23,190)
        (Decrease) increase in accounts payable to
           affiliates.....................................      (294)     (2,472)       3,326
                                                            --------    --------    ---------
          Net cash provided by operating activities.......    25,677      67,485       50,179
                                                            --------    --------    ---------
Cash flows from investing activities:
  Acquisition and development of oil and natural gas
     properties...........................................   (30,548)    (11,249)     (59,599)
  Additions to pipelines, platforms and facilities........   (27,368)    (30,708)     (30,095)
  Equity investments......................................    (8,195)         --      (12,027)
  Proceeds from sales of assets and other.................       487         188           --
                                                            --------    --------    ---------
          Net cash used in investing activities...........   (65,624)    (41,769)    (101,721)
                                                            --------    --------    ---------
Cash flows from financing activities:
  Decrease in restricted cash.............................        --         716           --
  Debt issue costs........................................      (928)        (93)      (2,843)
  Proceeds from notes payable.............................   129,000      65,000       89,220
  Repayments of notes payable.............................   (29,000)    (54,000)          --
  Distributions to partners...............................   (62,447)    (47,398)     (33,852)
                                                            --------    --------    ---------
          Net cash provided by (used in) financing
            activities....................................    36,625     (35,775)      52,525
                                                            --------    --------    ---------

Net (decrease) increase in cash and cash equivalents......    (3,322)    (10,059)         983
Cash and cash equivalents at beginning of year............     6,430      16,489       15,506
                                                            --------    --------    ---------
Cash and cash equivalents at end of year..................  $  3,108    $  6,430    $  16,489
                                                            ========    ========    =========
</TABLE>

Supplemental disclosures to the statement of cash flows -- see Note 11.

    The accompanying notes are an integral part of this financial statement.
                                      F-30
<PAGE>   178

             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

                  CONSOLIDATED STATEMENT OF PARTNERS' CAPITAL
                                 (In thousands)

<TABLE>
<CAPTION>
                                   PREFERENCE   PREFERENCE    COMMON     COMMON       GENERAL
                                     UNITS      UNITHOLDERS   UNITS    UNITHOLDERS   PARTNER(A)      TOTAL
                                   ----------   -----------   ------   -----------   ----------     --------
<S>                                <C>          <C>           <C>      <C>           <C>            <C>
Partners' capital at December 31,
  1995...........................    18,075      $ 192,225    6,292     $ (5,380)     $     (4)     $186,841
Net income for the year ended
  December 31, 1996..............        --         28,400       --        9,905           387        38,692
Cash distributions...............        --        (24,401)      --       (8,494)         (615)      (33,510)
                                    -------      ---------    ------    --------      --------      --------
Partners' capital at December 31,
  1996...........................    18,075        196,224    6,292       (3,969)         (232)      192,023
Net loss for the year ended
  December 31, 1997..............        --         (1,167)      --         (420)          449        (1,138)
Cash distributions...............        --        (31,631)      --      (11,011)       (4,277)      (46,919)
                                    -------      ---------    ------    --------      --------      --------
Partners' capital at December 31,
  1997...........................    18,075        163,426    6,292      (15,400)       (4,060)      143,966
Net income for the year ended
  December 31, 1998..............        --             63       --          541           142           746
Conversion of Preference Units
  into Common Units (Note 7).....   (17,058)      (127,842)   17,058     127,842            --            --
Cash distributions...............        --        (28,296)      --      (22,011)      (11,509)      (61,816)
                                    -------      ---------    ------    --------      --------      --------
Partners' capital at December 31,
  1998...........................     1,017      $   7,351    23,350    $ 90,972      $(15,427)(b)  $ 82,896
                                    =======      =========    ======    ========      ========      ========
</TABLE>

- ---------------
(a) Leviathan Gas Pipeline Company owns a 1% general partner interest in
    Leviathan Gas Pipeline Partners, L.P.

(b) Pursuant to the terms of the Partnership Agreement, no partner shall have
    any obligation to restore any negative balance in its capital account upon
    liquidation of Leviathan. Therefore, any net gains from the dissolution of
    Leviathan's assets would be allocated first to any then-outstanding deficit
    capital account balance before any of the remaining net proceeds would be
    distributed to the partners in accordance with their ownership percentages.

    The accompanying notes are an integral part of this financial statement.
                                      F-31
<PAGE>   179

             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

NOTE 1 -- ORGANIZATION:

     Leviathan Gas Pipeline Partners, L.P., a publicly held Delaware limited
partnership ("Leviathan"), is primarily engaged in the gathering, transportation
and production of natural gas and crude oil in the Gulf of Mexico (the "Gulf").
Through its subsidiaries and joint ventures, Leviathan owns interests in
significant assets, including (i) eight natural gas pipelines, (ii) a crude oil
pipeline system, (iii) six strategically located multi-purpose platforms, (iv) a
dehydration facility, (v) four producing oil and natural gas properties and (vi)
one undeveloped oil and natural gas property.

     Leviathan Gas Pipeline Company, a Delaware corporation and the general
partner of Leviathan (the "General Partner"), performs all management and
operational functions of Leviathan and its subsidiaries. In August 1998, the
General Partner became a wholly-owned indirect subsidiary of El Paso Energy
Corporation ("El Paso") pursuant to El Paso's merger with DeepTech International
Inc. ("DeepTech"), the indirect parent of the General Partner, as discussed
below.

  Merger

     Effective August 14, 1998, El Paso completed the acquisition of DeepTech by
merging a wholly-owned subsidiary of El Paso with and into DeepTech (the
"Merger") pursuant to the Agreement and Plan of Merger dated as of February 27,
1998 (as amended, the "Merger Agreement"). The material terms of the Merger and
the transactions contemplated by the Merger Agreement and other agreements as
these agreements relate to Leviathan are as follows:

     (a) Prior to the Merger, Leviathan Holdings Company, which owns 100% of the
         General Partner, was owned 85% by DeepTech resulting in DeepTech owning
         an overall 23.2% effective interest in Leviathan. El Paso acquired the
         minority interests of Leviathan Holdings Company and two other
         subsidiaries of DeepTech primarily held by former DeepTech management
         for an aggregate of $55.0 million. As a result, El Paso owns 100% of
         the General Partner's interest in Leviathan and an overall 27.3%
         effective interest in Leviathan.

     (b) In June 1998, Tatham Offshore, Inc. ("Tatham Offshore"), an affiliate
         of Leviathan through August 14, 1998, canceled its reversionary
         interests in certain oil and natural gas properties owned by Leviathan
         (Note 4).

     (c) On August 14, 1998, Tatham Offshore transferred its remaining assets
         located in the Gulf to Leviathan in exchange for the 7,500 shares of
         Series B 9% Senior Convertible Preferred Stock (the "Senior Preferred
         Stock") issued by Tatham offshore (Note 8) and owned by Leviathan (the
         "Redemption Agreement"). Under the terms of the Redemption Agreement,
         Leviathan acquired all of Tatham Offshore's right, title and interest
         in and to Viosca Knoll Blocks 817 (subject to an existing production
         payment obligation), West Delta Block 35, the platform located at Ship
         Shoal Block 331 and other lease blocks not material to Leviathan's
         current operations. The net cash expenditure of Leviathan under the
         Redemption Agreement totaled $774,000 representing (i) $2,771,000 of
         abandonment costs relating to wells located at Ewing Bank Blocks 914
         and 915 offset by (ii) $1,997,000 of net cash generated from the
         producing properties from January 1, 1998 through August 14, 1998. In
         addition, Leviathan assumed all remaining abandonment and restoration
         obligations associated with the platform and leases.

NOTE 2 -- SIGNIFICANT ACCOUNTING POLICIES:

  Principles of consolidation

     The accompanying consolidated financial statements include the accounts of
those 50% or more owned subsidiaries controlled by Leviathan. The General
Partner's approximate 1% nonmanaging interest

                                      F-32
<PAGE>   180
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

in certain subsidiaries of Leviathan represents the minority interest in
Leviathan's consolidated financial statements. Investments in which Leviathan
owns a 20% to 50% ownership interest are accounted for using the equity method.
All significant intercompany balances and transactions have been eliminated in
consolidation. Certain amounts from the prior year have been reclassified to
conform to the current year's presentation.

  Cash and cash equivalents

     All highly liquid investments with a maturity of three months or less when
purchased are considered to be cash equivalents.

  Property and equipment

     Gathering pipelines, platforms and related facilities are recorded at cost
and are depreciated on a straight-line basis over the estimated useful lives of
the assets which generally range from 5 to 30 years for the gathering pipelines
and from 18 to 30 years for platforms and the related facilities. Repair and
maintenance costs are expensed as incurred; additions, improvements and
replacements are capitalized.

     Leviathan accounts for its oil and natural gas exploration and production
activities using the successful efforts method of accounting. Under this method,
costs of successful exploratory wells, development wells and acquisitions of
mineral leasehold interests are capitalized. Production, exploratory dry hole
and other exploration costs, including geological and geophysical costs and
delay rentals, are expensed as incurred. Unproved properties are assessed
periodically and any impairment in value is recognized currently as
depreciation, depletion and amortization expense.

     Depreciation, depletion and amortization of the capitalized costs of
producing oil and natural gas properties, consisting principally of tangible and
intangible costs incurred in developing a property and costs of productive
leasehold interests, are computed on the unit-of-production method.
Unit-of-production rates are based on annual estimates of remaining proved
developed reserves or proved reserves, as appropriate, for each property. Repair
and maintenance costs are charged to expense as incurred; additions,
improvements and replacements are capitalized.

     Estimated dismantlement, restoration and abandonment costs and estimated
residual salvage values are taken into account in determining depreciation
provisions for gathering pipelines, platforms, related facilities and oil and
natural gas properties. Other noncurrent liabilities at December 31, 1998 and
1997 include $10,724,000 and $9,158,0000, respectively, of accrued
dismantlement, restoration and abandonment costs.

     Retirements, sales and disposals of assets are recorded by eliminating the
related costs and accumulated depreciation, depletion and amortization of the
disposed assets with any resulting gain or loss reflected in income.

     Leviathan evaluates impairment of its property and equipment in accordance
with Statement of Financial Accounting Standard ("SFAS") No. 121, "Accounting
for the Impairment of Long-Lived Assets and for Long-Lived Assets to Be Disposed
Of," which requires recognition of impairment losses on long-lived assets
(including pipelines, proved properties, wells, equipment and related
facilities) if the carrying amount of such assets, grouped at the lowest level
for which there are identifiable cash flows that are largely independent of the
cash flows from other assets, exceeds the estimated undiscounted future cash
flows of such assets. Measurement of any impairment loss is based on the fair
value of the assets.

                                      F-33
<PAGE>   181
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

  Capitalization of interest

     Interest and other financing costs are capitalized in connection with
construction and drilling activities as part of the cost of the asset and
amortized over the related asset's estimated useful life.

  Debt issue costs

     Debt issue costs are capitalized and amortized over the life of the related
indebtedness. Any unamortized debt issue costs are expensed at the time the
related indebtedness is repaid or otherwise terminated.

  Revenue recognition

     Revenue from pipeline transportation of hydrocarbons is recognized upon
receipt of the hydrocarbons into the pipeline systems. Revenue from oil and
natural gas sales is recognized upon delivery in the period of production.
Revenue from platform access and processing services is recognized in the period
the services are provided.

  Income taxes

     Leviathan and its subsidiaries other than Tarpon Transmission Company
("Tarpon") are not taxable entities. However, the taxable income or loss
resulting from the operations of Leviathan will ultimately be included in the
federal and state income tax returns of the general and limited partners.
Individual partners will have different investment bases depending upon the
timing and price of acquisition of partnership units. Further, each partner's
tax accounting, which is partially dependent upon his/her tax position, may
differ from the accounting followed in the consolidated financial statements.
Accordingly, there could be significant differences between each individual
partner's tax basis and his/her share of the net assets reported in the
consolidated financial statements. Leviathan does not have access to information
about each individual partner's tax attributes in Leviathan, and the aggregate
tax bases cannot be readily determined. Accordingly, management does not believe
that, in Leviathan's circumstances, the aggregate difference would be meaningful
information.

     Tarpon is, and Manta Ray Gathering Systems, Inc. ("Manta Ray") was, prior
to its liquidation in May 1996, a subsidiary of Leviathan subject to federal
corporate income taxation. Leviathan utilizes an asset and liability approach
for accounting for income taxes of Tarpon and Manta Ray that requires the
recognition of deferred tax assets and liabilities for the expected future tax
consequences of temporary differences between the carrying amounts and tax bases
of other assets and liabilities. Resulting tax liabilities, if any, are borne by
Leviathan.

  Net income per unit

     Basic earnings per share ("EPS") excludes dilution and is computed by
dividing net income (loss) attributable to the limited partners by the weighted
average number of units outstanding during the period. Dilutive EPS reflects
potential dilution and is computed by dividing net income (loss) attributable to
the limited partners by the weighted average number of units outstanding during
the period increased by the number of additional units that would have been
outstanding if the dilutive potential units had been issued.

     Basic income (loss) per unit and diluted income (loss) per unit for
Leviathan are the same for the years ended December 31, 1998, 1997 and 1996 as
no dilutive potential units were outstanding during the respective periods.
Leviathan includes the outstanding Preference Units in the basic and diluted net
income (loss) per unit calculation as if the Preference Units had been converted
into Common Units.

                                      F-34
<PAGE>   182
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

     Basic and diluted net income (loss) per unit is calculated based upon the
net income (loss) of Leviathan less an allocation of net income to the General
Partner proportionate to its share of cash distributions and is calculated as
follows (in thousands).

<TABLE>
<CAPTION>
                                           YEAR ENDED DECEMBER 31, 1998    YEAR ENDED DECEMBER 31, 1997
                                           -----------------------------   ----------------------------
                                            LIMITED    GENERAL             LIMITED    GENERAL
                                           PARTNERS    PARTNER    TOTAL    PARTNERS   PARTNER    TOTAL
                                           ---------   --------   ------   --------   -------   -------
<S>                                        <C>         <C>        <C>      <C>        <C>       <C>
Net income (loss)(a).....................   $   738      $  8      $746    $(1,127)    $(11)    $(1,138)
Allocation to General Partner(b).........      (134)      134        --       (460)     460          --
                                            -------      ----      ----    -------     ----     -------
Allocation of net income (loss) as
  adjusted for Incentive Distributions...   $   604      $142      $746    $(1,587)    $449     $(1,138)
                                            =======      ====      ====    =======     ====     =======
Weighted average number of units
  outstanding............................    24,367                         24,367
                                            =======                        =======
Basic and diluted net income (loss) per
  unit...................................   $  0.02                        $ (0.06)
                                            =======                        =======
</TABLE>

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

(a) Net income (loss) allocated 99% to the limited partners as holders of the
    Preference and Common Units and 1% to the General Partner.

(b) Represents allocation of net income to the General Partner proportionate to
    its share of each quarter's cash distributions which included Incentive
    Distributions (Note 7).

     For the year ended December 31, 1996, basic and diluted net income per unit
was computed based upon the net income of Leviathan less an allocation of
approximately 1% of Leviathan's net income to the General Partner. During 1996,
the General Partner only received a 1% allocation of net income as Leviathan did
not pay any Incentive Distributions (Note 7) until 1997. The weighted average
number of Units outstanding for the year ended December 31, 1996 was 24,366,894
Units.

  Estimates

     The preparation of consolidated financial statements in conformity with
generally accepted accounting principles and the estimation of oil and natural
gas reserves requires management to make estimates and assumptions that affect
the reported amounts of certain assets and liabilities, the disclosure of
contingent assets and liabilities at the date of the consolidated financial
statements and the related reported amounts of revenue and expenses during the
reporting period. Such estimates and assumptions include those regarding: (i)
Federal Energy Regulatory Commission ("FERC") regulations, (ii) oil and natural
gas reserve disclosure, (iii) estimated useful lives of depreciable assets and
(iv) potential abandonment, dismantlement, restoration and environmental
liabilities. Actual results could differ from those estimates. Management
believes that its estimates are reasonable.

  Unit Options

     In August 1998, Leviathan adopted SFAS No. 123, "Accounting for Stock Based
Compensation." While SFAS No. 123 encourages entities to adopt the fair value
method of accounting for their stock-based compensation plans, this standard
permits and Leviathan has elected to utilize the intrinsic value method under
Accounting Principles Board ("APB") Opinion No. 25, "Accounting for Stock Issued
to Employees." Prior to August 1998, compensation expense for Leviathan's unit
appreciation rights was recorded annually based on the quoted market price of
Preference Units at the end of the period and the percentage of vesting which
had occurred. A description of Leviathan's option plans and pro forma
information regarding net income (loss) and net income (loss) per unit, as
calculated under the provisions of SFAS No. 123, are disclosed in Note 7.

                                      F-35
<PAGE>   183
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

  Price Risk Management Activities

     Leviathan enters into commodity price swap instruments for non-trading
purposes to manage its exposure to price fluctuations on anticipated natural gas
and crude oil sales transactions. To qualify for hedge accounting, the
transactions must reduce the risk of the underlying hedge items, be designated
as hedges at inception and result in cash flows and financial impacts which are
inversely correlated to the position being hedged. If correlation ceases to
exist, hedge accounting is terminated and mark-to-market accounting is applied.
Gains and losses resulting from hedging activities and the termination of any
hedging instruments are initially deferred and included as an increase or
decrease to oil and natural gas sales in the period in which the hedged
production is sold. See Note 10.

  Recent Pronouncements

     Effective January 1, 1998, Leviathan adopted SFAS No. 131, "Disclosures
About Segments of an Enterprise and Related Information." SFAS No. 131
establishes standards for the method public entities report information about
operating segments in both interim and annual financial statements issued to
unitholders and requires related disclosures about products and services,
geographic areas and major customers. See Notes 3, 4, 12 and 13.

     In April 1998, the American Institute of Certified Public Accountants
issued Statement of Position 98-5, "Reporting on the Costs of Start-Up
Activities." This statement defines start-up activities, requires start-up and
organization costs to be expensed as incurred and requires that any such costs
that exist on the balance sheet be expensed upon adoption of this pronouncement.
The statement is effective for fiscal years beginning after December 15, 1998.
Leviathan does not expect the implementation of this statement to have a
material effect on Leviathan's financial position or results of operations.

     In June 1998, the Financial Accounting Standards Board issued SFAS No. 133,
"Accounting for Derivative Instruments and Hedging Activities." SFAS No. 133
requires that entities recognize all derivative instruments as either assets or
liabilities on the balance sheet and measure those instruments at fair value.
Changes in the fair value of derivatives are recorded each period in current
earnings or other comprehensive income, depending on whether a derivative is
designated as a hedge transaction. For fair-value hedge transactions in which
Leviathan is hedging changes in an asset's, liability's or firm commitment's
fair value, changes in the fair value of the derivative instrument will
generally be offset in the income statement by changes in the hedged item's fair
value. For cash-flow hedge transactions, in which Leviathan is hedging the
variability of cash flows related to a variable-rate asset, liability, or a
forecasted transaction, changes in the fair value of the derivative instrument
will be reported in other comprehensive income. The gains and losses on the
derivative instrument that are reported in other comprehensive income will be
reclassified as earnings in the periods in which earnings are impacted by the
variability of the cash flows of the hedged item. The ineffective portion of all
hedges will be recognized in current-period earnings. This statement is
effective for fiscal years beginning after June 15, 1999. Leviathan has not yet
determined the impact that the adoption of SFAS No. 133 will have on its
financial position or results of operations.

     In November 1998, the Emerging Issues Task Force ("EITF") reached a
consensus on EITF 98-10, "Accounting for Contracts Involved in Energy Trading
and Risk Management Activities." EITF 98-10 requires energy trading contracts to
be recorded at fair value on the balance sheet, with the changes in fair value
included in earnings and is effective for fiscal years beginning after December
15, 1998. Leviathan adopted the provisions of EITF 98-10 in January 1999 and
does not believe that the application of this pronouncement will have a material
impact on Leviathan's financial position or results of operations.

                                      F-36
<PAGE>   184
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

NOTE 3 -- EQUITY INVESTMENTS:

     Leviathan owns interests of 50% in Viosca Knoll Gathering Company ("Viosca
Knoll"), 36% in Poseidon Oil Pipeline Company, L.L.C. ("POPCO"), 50% in Stingray
Pipeline Company ("Stingray"), 40% in High Island Offshore System, L.L.C.,
("HIOS"), 33 1/3% in U-T Offshore System ("UTOS"), 50% in West Cameron
Dehydration Company, L.L.C. ("West Cameron Dehy") and an effective 25.67%
interest in each of Manta Ray Offshore Gathering Company, L.L.C. ("Manta Ray
Offshore") and Nautilus Pipeline Company, L.L.C. ("Nautilus").

     The excess of the carrying amount of the investments accounted for using
the equity method over the underlying equity in net assets as of December 31,
1998 is $45,023,000. The difference between the cost of the investments
accounted for on the equity method and the underlying equity in net assets is
being depreciated on a straight-line basis over the estimated lives of the
underlying net assets.

     The summarized financial information for investments, which are accounted
for using the equity method, is as follows.

SUMMARIZED HISTORICAL OPERATING RESULTS
YEAR ENDED DECEMBER 31, 1998
(In thousands)

<TABLE>
<CAPTION>
                                                                      WEST                  MANTA
                                      VIOSCA                         CAMERON                 RAY
                             HIOS      KNOLL    STINGRAY    POPCO     DEHY      UTOS     OFFSHORE(A)   NAUTILUS(A)    TOTAL
                           --------   -------   --------   -------   -------   -------   -----------   -----------   -------
<S>                        <C>        <C>       <C>        <C>       <C>       <C>       <C>           <C>           <C>
Operating revenue........  $ 43,818   $29,334   $ 23,008   $44,522   $2,796    $ 5,174     $10,949      $  5,403
Other income.............        --        50        670      290        11        100         488           100
Operating expenses.......   (19,047)   (3,031)   (16,814)  (4,763)     (183)    (2,466)     (3,710)       (1,979)
Depreciation.............    (4,772)   (3,860)    (6,852)  (8,846)      (16)      (559)     (4,303)       (5,845)
Interest expense.........       (16)   (4,267)    (1,668)  (8,671)       --         (2)         --            --
                           --------   -------   --------   -------   ------    -------     -------      --------
Net earnings (loss)......    19,983    18,226     (1,656)  22,532     2,608      2,247       3,424        (2,321)
Ownership percentage.....        40%       50%        50%      36%       50%      33.3%      25.67%        25.67%
                           --------   -------   --------   -------   ------    -------     -------      --------
                              7,993     9,113       (828)   8,111     1,304        749         879          (596)
Adjustments:
  Depreciation(b)........       881        --        749     (120)       --         33        (348)           --
  Contract
    amortization(b)......      (105)       --       (127)      --        --         --          --            --
  Other..................      (149)       --        (49)      --        --        (52)         --          (714)(c)
                           --------   -------   --------   -------   ------    -------     -------      --------
Equity in earnings
  (loss).................  $  8,620   $ 9,113   $   (255)  $7,991    $1,304    $   730     $   531      $ (1,310)    $26,724
                           ========   =======   ========   =======   ======    =======     =======      ========     =======
Distributions(d).........  $  9,240   $10,350   $  1,000   $6,732    $1,100    $   933     $ 1,182      $    634     $31,171
                           ========   =======   ========   =======   ======    =======     =======      ========     =======
</TABLE>

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

(a) Leviathan owns a 25.67% interest in Neptune Pipeline Company, L.L.C.
    ("Neptune"). Neptune owns a 99% member interest in each of Manta Ray
    Offshore, which owns a non-jurisdictional natural gas system, and Nautilus,
    which owns a jurisdictional natural gas system. Leviathan believes the
    disclosure of separate financial data for Manta Ray Offshore and Nautilus is
    more meaningful than the consolidated results of Neptune.

(b) Adjustments result from purchase price adjustments made in accordance with
    APB Opinion No. 16 "Business Combinations."

(c) Primarily relates to a revision of the allowance for funds used during
    construction ("AFUDC") which represents the estimated costs, during the
    construction period, of funds used for construction.

(d) Future distributions could be restricted by the terms of the equity
    investees' respective credit agreements.

                                      F-37
<PAGE>   185
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

SUMMARIZED HISTORICAL OPERATING RESULTS
YEAR ENDED DECEMBER 31, 1997
(In thousands)

<TABLE>
<CAPTION>
                                                                        WEST                  MANTA
                                        VIOSCA                         CAMERON                 RAY
                               HIOS      KNOLL    STINGRAY    POPCO     DEHY      UTOS     OFFSHORE(A)   NAUTILUS(A)    TOTAL
                             --------   -------   --------   -------   -------   -------   -----------   -----------   -------
<S>                          <C>        <C>       <C>        <C>       <C>       <C>       <C>           <C>           <C>
Operating revenue..........  $ 45,917   $23,128   $ 23,630   $26,161   $2,451    $ 3,785     $ 6,263       $   54
Other income...............        --        40        970      209        29         61       1,564        6,489(b)
Operating expenses.........   (17,101)   (2,115)   (15,612)  (5,782)     (164)    (2,472)     (2,223)        (435)
Depreciation...............    (4,774)   (2,474)    (7,216)  (6,463)      (16)      (566)     (1,823)        (233)
Interest expense...........        --    (1,959)    (1,384)  (5,341)       --         37      (1,483)          --
                             --------   -------   --------   -------   ------    -------     -------       ------
Net earnings...............    24,042    16,620        388    8,784     2,300        845       2,298        5,875
Ownership percentage.......        40%       50%        50%      36%       50%      33.3%      25.67%       25.67%
                             --------   -------   --------   -------   ------    -------     -------       ------
                                9,617     8,310        194    3,162     1,150        281         590        1,508
Adjustments:
  Depreciation(c)..........       845        --        959     (120)       --         35          --           --
  Contract
    amortization(c)........      (105)       --       (350)      --        --         --          --           --
  Other....................      (228)       --        (49)    (263)       --        (24)      3,082(d)       733
                             --------   -------   --------   -------   ------    -------     -------       ------
Equity in earnings.........  $ 10,129   $ 8,310   $    754   $2,779    $1,150    $   292     $ 3,672       $2,241      $29,327
                             ========   =======   ========   =======   ======    =======     =======       ======      =======
Distributions(e)...........  $ 12,200   $ 9,650   $  1,375   $   --    $1,150    $   200     $ 2,560       $   --      $27,135
                             ========   =======   ========   =======   ======    =======     =======       ======      =======
</TABLE>

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

(a) Leviathan owns a 25.67% interest in Neptune. Neptune owns a 99% member
    interest in each of Manta Ray Offshore, which owns a non-jurisdictional
    natural gas system, and Nautilus, which owns a jurisdictional natural gas
    system. Leviathan believes the disclosure of separate financial data for
    Manta Ray Offshore and Nautilus is more meaningful than the consolidated
    results of Neptune.

(b) Includes $6,431,000 related to AFUDC. Recognition of this allowance is
    appropriate because it constitutes an actual cost of construction. For
    regulated activities, Nautilus is permitted to earn a return on and recover
    AFUDC through its inclusion in the rate base and the provision for
    depreciation. The rate employed for the equity component of AFUDC is the
    equity rate of return stated in Nautilus' FERC tariff.

(c) Adjustments result from purchase price adjustments made in accordance with
    APB Opinion No. 16 "Business Combinations."

(d) Represents additional net earnings specifically allocated to Leviathan
    related to the assets contributed by Leviathan to the Manta Ray Offshore
    joint venture. Pursuant to the terms of the joint venture agreement,
    Leviathan managed the operations of the assets contributed to Manta Ray
    Offshore and was permitted to retain approximately 100% of the net earnings
    from such assets during the construction phase of the expansion to the Manta
    Ray Offshore system (January 17, 1997 through December 31, 1997). Effective
    January 1, 1998, Manta Ray Offshore began allocating all net earnings in
    accordance with the ownership percentages of the joint venture.

(e) Future distributions could be restricted by the terms of the equity
    investees' respective credit agreements.

                                      F-38
<PAGE>   186
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

SUMMARIZED HISTORICAL OPERATING RESULTS
YEAR ENDED DECEMBER 31, 1996
(In thousands)

<TABLE>
<CAPTION>
                                                                                          WEST
                                                          VIOSCA                         CAMERON
                                                 HIOS      KNOLL    STINGRAY    POPCO     DEHY      UTOS      TOTAL
                                               --------   -------   --------   -------   -------   -------   -------
<S>                                            <C>        <C>       <C>        <C>       <C>       <C>       <C>
Operating revenue............................  $ 47,440   $13,923   $ 24,146   $7,819    $1,686    $ 3,476
Other income.................................        97        --      1,186      339        10         48
Operating expenses...........................   (15,683)     (424)   (14,260)  (3,042)     (162)    (2,511)
Depreciation.................................    (4,775)   (2,269)    (7,057)  (2,176)      (16)      (560)
Other expenses...............................        --       (90)    (1,679)    (269)       --         --
                                               --------   -------   --------   -------   ------    -------
Net earnings.................................    27,079    11,140      2,336    2,671     1,518        453
Ownership percentage.........................        40%       50%        50%      36%       50%      33.3%
                                               --------   -------   --------   -------   ------    -------
                                                 10,832     5,570      1,168      962       759        151
Adjustments:
  Depreciation(a)............................       783        --        669       --        --          2
  Contract amortization(a)...................      (105)       --         --       --        --         --
  Rate refund reserve........................      (417)       --         --       --        --         --
  Other......................................      (107)       --         --      167        --         --
                                               --------   -------   --------   -------   ------    -------
Equity in earnings...........................  $ 10,986   $ 5,570   $  1,837   $1,129    $  759    $   153   $20,434
                                               ========   =======   ========   =======   ======    =======   =======
Distributions................................  $ 11,400   $18,450   $  1,923   $4,000    $  650    $   400   $36,823
                                               ========   =======   ========   =======   ======    =======   =======
</TABLE>

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

(a) Adjustments result from purchase price adjustments made in accordance with
    APB Opinion No. 16, "Business Combinations."

SUMMARIZED HISTORICAL BALANCE SHEETS
(In thousands)

<TABLE>
<CAPTION>
                                           HIOS            VIOSCA KNOLL           STINGRAY                POPCO
                                     -----------------   -----------------   -------------------   -------------------
                                       DECEMBER 31,        DECEMBER 31,         DECEMBER 31,          DECEMBER 31,
                                     -----------------   -----------------   -------------------   -------------------
                                      1998      1997      1998      1997       1998       1997       1998       1997
                                     -------   -------   -------   -------   --------   --------   --------   --------
<S>                                  <C>       <C>       <C>       <C>       <C>        <C>        <C>        <C>
Current assets.....................  $ 4,662   $ 5,587   $ 5,451   $ 3,354   $ 17,892   $ 20,184   $ 43,338   $ 31,763
Noncurrent assets..................   12,936    12,081    97,758    98,004     50,109     42,541    233,082    226,055
Current liabilities................    2,626     3,380     1,021    11,280     18,960     21,787     40,134     35,864
Long-term debt.....................       --        --    66,700    52,200     20,583     11,600    131,000    120,500
Other noncurrent liabilities.......       --       199       340       256     12,924      5,289         --         --
</TABLE>

<TABLE>
<CAPTION>
                                       WEST CAMERON
                                           DEHY                UTOS          MANTA RAY OFFSHORE         NAUTILUS
                                     -----------------   -----------------   -------------------   -------------------
                                       DECEMBER 31,        DECEMBER 31,         DECEMBER 31,          DECEMBER 31,
                                     -----------------   -----------------   -------------------   -------------------
                                      1998      1997      1998      1997       1998       1997       1998       1997
                                     -------   -------   -------   -------   --------   --------   --------   --------
<S>                                  <C>       <C>       <C>       <C>       <C>        <C>        <C>        <C>
Current assets.....................  $   848   $   455   $ 4,699   $ 3,955   $  7,250   $ 31,714   $  2,782   $    924
Noncurrent assets..................      647       663     2,745     2,803    135,626    127,731    113,434    120,074
Current liabilities................       13        43     4,125     2,900      5,023     32,601        709      3,699
</TABLE>

                                      F-39
<PAGE>   187
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

NOTE 4 -- OIL AND NATURAL GAS PROPERTIES:

  Capitalized Costs

<TABLE>
<CAPTION>
                                                                 DECEMBER 31,
                                                              -------------------
                                                                1998       1997
                                                              --------   --------
                                                                (In thousands)
<S>                                                           <C>        <C>
Proved properties...........................................  $ 53,313   $ 38,790
Wells, equipment and related facilities.....................    99,437     81,506
                                                              --------   --------
          Total capitalized costs...........................   152,750    120,296
Accumulated depreciation, depletion and amortization........    72,194     53,684
                                                              --------   --------
          Net capitalized costs.............................  $ 80,556   $ 66,612
                                                              ========   ========
</TABLE>

  Costs incurred in the Oil and Natural Gas Acquisitions, Exploration and
Development Activities

<TABLE>
<CAPTION>
                                                              YEAR ENDED DECEMBER 31,
                                                              ------------------------
                                                                1998           1997
                                                              ---------      ---------
                                                                   (In thousands)
<S>                                                           <C>            <C>
Acquisitions of proved properties...........................   $16,945        $     1
Development.................................................    17,783         10,522
Capitalized interest........................................       328            726
                                                               -------        -------
          Total costs incurred..............................   $35,056        $11,249
                                                               =======        =======
</TABLE>

     In October 1998, Leviathan purchased a 100% working interest in Ewing Bank
Blocks 958, 959, 1002 and 1003 from a wholly-owned indirect subsidiary of El
Paso for $12,235,000. In December 1998, Leviathan completed the drilling of a
successful delineation well on the Ewing Bank unit.

     In 1995, Leviathan entered into a purchase and sale agreement (the
"Purchase and Sale Agreement") with Tatham Offshore pursuant to which Leviathan
acquired, subject to certain reversionary rights, a 75% working interest in
Viosca Knoll Block 817, a 50% working interest in Garden Banks Block 72 and a
50% working interest in Garden Banks Block 117 (the "Acquired Properties") from
Tatham Offshore for $30 million. Leviathan was entitled to retain all of the
revenue attributable to the Acquired Properties until it had received net
revenue equal to the payout amount, whereupon Tatham Offshore was entitled to
receive a reassignment of the Acquired Properties, subject to certain reductions
and conditions. In connection with the Merger, Tatham Offshore canceled its
reversionary interests in the Acquired Properties (Note 1).

NOTE 5 -- REGULATORY MATTERS:

     The FERC has jurisdiction under the Natural Gas Act of 1938, as amended
(the "NGA"), and the Natural Gas Policy Act of 1978, as amended (the "NGPA"),
over Nautilus, Stingray, HIOS and UTOS (the "Regulated Pipelines") with respect
to transportation of natural gas, rates and charges, construction of new
facilities, extension or abandonment of service and facilities, accounts and
records, depreciation and amortization policies and certain other matters.
Leviathan's remaining systems (the "Unregulated Pipelines") are gathering
facilities and as such are not currently subject to rate and certificate
regulation by the FERC under the NGA and the NGPA. However, the FERC has
asserted that it has rate jurisdiction under the NGA over services performed
through gathering facilities owned by a natural gas company (as defined in the
NGA) when such services are performed "in connection with" transportation
services provided by such natural gas company. Whether, and to what extent, the
FERC will exercise any NGA rate jurisdiction it may be found to have over
gathering facilities owned either by natural gas companies or affiliates thereof
is subject to case-by-case review by the FERC. Based on current FERC

                                      F-40
<PAGE>   188
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

policy and precedent, Leviathan does not anticipate that the FERC will assert or
exercise any NGA rate jurisdiction over the Unregulated Pipelines so long as the
services provided through such lines are not performed "in connection with"
transportation services performed through any of the Regulated Pipelines. Both
the Regulated and the Unregulated Pipelines are subject to the FERC's
administration of the "equal access" requirements of the Outer Continental Shelf
Lands Act ("OCSLA").

     Poseidon is subject to regulation under the Hazardous Liquid Pipeline
Safety Act ("HLPSA"). Operations in offshore federal waters are regulated by the
Department of the Interior. In addition, as transporter of hydrocarbons across
the Outer Continental Shelf ("OCS"), the Poseidon system must offer "equal
access" to other potential shippers of crude. Poseidon is located in federal
waters in the Gulf, and its right-of-way was granted by the federal government.
Therefore, the FERC may assert that it has jurisdiction to compel Poseidon to
grant access under OCSLA to other shippers of crude oil upon the satisfaction of
certain conditions and to apportion the capacity of the line among owner and
non-owner shippers.

     The FERC has generally disclaimed jurisdiction to set rates for oil
pipelines in the OCS under the Interstate Commerce Act. As a result, POPCO has
not filed tariffs with the FERC for the Poseidon crude oil pipeline system.

  Rate Cases

     Tarpon. In March 1997, the FERC issued an order declaring Tarpon's
facilities exempt from NGA regulation under the gathering exception, thereby
terminating Tarpon's status as a "natural gas company" under the NGA. Tarpon has
agreed, however, to continue service for shippers that have not executed
replacement contracts on the terms and conditions, and at the rates reflected
in, its last effective regulated tariff for two years from the date of the
order.

     Other. Each of Nautilus, Stingray, HIOS, and UTOS are currently operating
under agreements with their respective customers that provide for rates that
have been approved by the FERC.

NOTE 6 -- INDEBTEDNESS:

     Leviathan has a revolving credit facility, as amended and restated (the
"Leviathan Credit Facility"), with a syndicate of commercial banks to provide up
to $375 million of available credit, subject to certain incurrence limitations.
As of December 31, 1998 and 1997, Leviathan had $338 million and $238 million,
respectively, outstanding under its credit facility. At the election of
Leviathan, interest under the Leviathan Credit Facility is determined by
reference to the reserve-adjusted London interbank offer rate ("LIBOR"), the
prime rate or the 90-day average certificate of deposit. The interest rate at
December 31, 1998 and 1997 was 7.1% and 6.6% per annum, respectively. A
commitment fee is charged on the unused and available to be borrowed portion of
the credit facility. This fee varies between 0.25% and 0.375% per annum and was
0.375% per annum at December 31, 1998. The amendment to the credit facility in
January 1999 increased the commitment fee to 0.50% per annum. Amounts advanced
under the Leviathan Credit Facility were used to finance Leviathan's capital
expenditures, including construction of platforms and pipelines, investments in
equity investees and the acquisition and development of oil and natural gas
properties. Amounts remaining under the Leviathan Credit Facility are available
to Leviathan for general partnership purposes, including financing capital
expenditures, for working capital, and subject to certain limitations, for
paying distributions to unitholders. The Leviathan Credit Facility can also be
utilized to issue letters of credit as may be required from time to time;
however, no letters of credit are currently outstanding. The Leviathan Credit
Facility matures in December 1999; is guaranteed by Leviathan and each of
Leviathan's subsidiaries; and is collateralized by the management agreement with
Leviathan (Note 8), substantially all of the assets of Leviathan and the General
Partner's 1% general partner interest in Leviathan and approximate 1%
nonmanaging interest in certain subsidiaries of Leviathan. Management
                                      F-41
<PAGE>   189
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

believes it will be able to extend or refinance this credit facility on
acceptable terms and conditions prior to its maturity.

     Interest and other financing costs totaled $21,308,000, $15,890,000 and
$17,470,000 for the years ended December 31, 1998, 1997 and 1996, respectively.
During the years ended December 31, 1998, 1997 and 1996, Leviathan capitalized
$1,066,000, $1,721,000 and $11,910,000, respectively, of such interest costs in
connection with construction projects and drilling activities in progress during
such periods. At December 31, 1998 and 1997, the unamortized portion of debt
issue costs totaled $2,549,000 and $3,749,000, respectively.

NOTE 7 -- PARTNERS' CAPITAL:

  General

     As of December 31, 1998, Leviathan had 23,349,988 Common Units and
1,016,906 Preference Units outstanding. Preference Units and Common Units
totaling 18,075,000 are owned by the public, representing a 72.7% effective
limited partner interest in Leviathan. The General Partner, through its
ownership of a 25.3% limited partner interest in the form of 6,291,894 Common
Units, its 1% general partner interest in Leviathan and its approximate 1%
nonmanaging interest in certain subsidiaries of Leviathan, owns a 27.3%
effective interest in Leviathan. See Note 14.

  Conversion of Preference Units into Common Units

     On May 7, 1998, Leviathan notified the holders of its 18,075,000 then
outstanding Preference Units of their right to convert their Preference Units
into an equal number of Common Units within a 90-day period. On August 5, 1998,
the conversion period expired and holders of 17,058,094 Preference Units,
representing approximately 94% of the Preference Units then outstanding, elected
to convert to Common Units. As a result, the Preference Period, as defined in
the Amended and Restated Agreement of Limited Partnership (the "Partnership
Agreement"), ended and the Common Units (including the 6,291,894 Common Units
held by Leviathan) became the primary listed security on the New York Stock
Exchange ("NYSE") under the symbol "LEV." A total of 1,016,906 Preference Units
remain outstanding and trade as Leviathan's secondary listed security on the
NYSE under the symbol "LEV.P". Leviathan reallocated partners' capital to
reflect this conversion of Preference Units into Common Units.

     The remaining Preference Units retain their distribution preferences over
the Common Units; that is, holders of such Preference Units will be paid up to
the minimum quarterly distribution of $0.275 per unit before any quarterly
distributions are made to the Common Unitholders or the General Partner.
However, holders of Preference Units will not receive any distributions in
excess of the minimum quarterly distribution of $0.275 per unit. Only holders of
Common Units and the General Partner will be eligible to receive any such excess
distributions. See "Cash Distributions" below.

     In accordance with the Partnership Agreement, holders of the remaining
Preference Units will have the opportunity to convert their Preference Units
into Common Units in May 1999 and May 2000. Thereafter, any remaining Preference
Units may, under certain circumstances, be subject to redemption.

  Cash Distributions

     Leviathan makes quarterly distributions of 100% of its Available Cash, as
defined in the Partnership Agreement, to its unitholders and the General
Partner. Available Cash consists generally of all the cash receipts of Leviathan
plus reductions in reserves less all of its cash disbursements and net additions
to reserves. The General Partner has broad discretion to establish cash reserves
that it determines are necessary or appropriate to provide for the proper
conduct of the business of Leviathan including cash reserves for future capital
expenditures, to stabilize distributions of cash to the unitholders and the
General

                                      F-42
<PAGE>   190
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

Partner, to reduce debt or as necessary to comply with the terms of any
agreement or obligation of Leviathan. Leviathan expects to make distributions of
Available Cash within 45 days after the end of each quarter to unitholders of
record on the applicable record date, which will generally be the last business
day of the month following the close of such calendar quarter.

     The distribution of Available Cash for each quarter is subject to the
preferential rights of the Preference Unitholders to receive the minimum
quarterly distribution of $0.275 per unit for such quarter, plus any arrearages
in the payment of the minimum quarterly distribution for prior quarters, if any,
before any distribution of Available Cash is made to holders of Common Units for
such quarter. The holders of Common Units are not entitled to arrearages in the
payment of the minimum quarterly distribution. See the discussion above
regarding distributions subsequent to the end of the Preference Period.

     Since commencement of operations on February 19, 1993 through December 31,
1998, Leviathan has made distributions to the unitholders equal to and in excess
of the minimum quarterly distribution of $0.275 per unit. See Note 16.

     Distributions by Leviathan of its Available Cash are effectively made 98%
to unitholders and 2% to the General Partner, subject to the payment of
incentive distributions to the General Partner if certain target levels of cash
distributions to unitholders are achieved ("Incentive Distributions"). As an
incentive, the general partner's interest in the portion of quarterly cash
distributions in excess of $0.325 per Unit and less than or equal to $0.375 per
Unit is increased to 15%. For quarterly cash distributions over $0.375 per Unit
but less than or equal to $0.425 per Unit, the general partner receives 25% of
such incremental amount and for all quarterly cash distributions in excess of
$0.425 per Unit, the general partner receives 50% of the incremental amount.
During the years ended December 31, 1998, 1997 and 1996, the General Partner
received Incentive Distributions totaling $11,113,000, $3,885,000 and $285,000,
respectively. In February 1999, Leviathan paid a cash distribution of $0.275 per
Preference Unit and $0.525 per Common Unit and an Incentive Distribution of
$2,835,000 to the General Partner.

  Unit Rights Appreciation Plan

     In 1995, Leviathan adopted the Unit Rights Appreciation Plan (the "Plan")
to provide Leviathan with the ability of making awards of unit rights to certain
officers and employees of the General Partner or its affiliates as an incentive
for these individuals to continue in the service of Leviathan or its affiliates.
Under the Plan, Leviathan granted 1,200,000 unit rights to certain officers and
employees of the General Partner or its affiliates that provided for the right
to purchase, or realize the appreciation of, a Preference Unit or a Common Unit
(a "Unit Right"), pursuant to the provisions of the Plan. The exercise prices
covered by the Unit Rights granted pursuant to the Plan ranged from $15.6875 to
$21.50, the closing prices of the Preference Units as reported on the NYSE on
the grant date of the respective Unit Rights. For the years ended December 31,
1997 and 1996, Leviathan had accrued $3,710,000 and $436,000, respectively,
related to the appreciation and vestiture of these Unit Rights through such
dates. As a result of the "change in control" occurring upon the closing of the
Merger, the Unit Rights fully vested and the holders of the Unit Rights elected
to be paid $8,591,000, the amount equal to the difference between the grant
price of the Unit Rights and the average of the high and the low sales price of
the Common Units on the date of exercise. Upon the exercise of all of the Unit
Rights outstanding, the Plan was terminated. Leviathan replaced the Plan with
the Omnibus Plan discussed below.

  Option Plans

     In August 1998, Leviathan adopted the 1998 Omnibus Compensation Plan (the
"Omnibus Plan") to provide the General Partner with the ability to issue unit
options to attract and retain the services of knowledgeable officers and key
management personnel. Unit options to purchase a maximum of 3,000,000 Common
Units of Leviathan may be issued pursuant to the Omnibus Plan. Unit options
granted pursuant
                                      F-43
<PAGE>   191
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

to the Omnibus Plan are not immediately exercisable. One-half of the unit
options are considered vested and exercisable one year after the date of grant
and the remaining one-half of the unit options are considered vested and
exercisable one year after the first anniversary of the date of grant. The unit
options shall expire ten years from such grant date, but shall be subject to
earlier termination under certain circumstances.

     In August 1998, Leviathan adopted the 1998 Unit Option Plan for
Non-Employee Directors (the "Director Plan" and collectively with the Omnibus
Plan, the "Option Plans") to provide the General Partner with the ability to
issue unit options to attract and retain the services of knowledgeable
directors. Unit options to purchase a maximum of 100,000 Common Units of
Leviathan may be issued pursuant to the Director Plan. Each unit option granted
under the Director Plan vests immediately at the date of grant and shall expire
ten years from such date, but shall be subject to earlier termination in the
event that the director ceases to be a director of the General Partner for any
reason, in which case the unit options expire 36 months after such date except
in the case of death, in which case the unit options expire 12 months after such
date.

     The following table summarizes the Option Plans as of and for the year
ended December 31, 1998. No unit options had been granted by Leviathan prior to
August 1998.

<TABLE>
<CAPTION>
                                                        NUMBER UNITS OF     WEIGHTED AVERAGE
                                                       UNDERLYING OPTIONS    EXERCISE PRICE
                                                       ------------------   ----------------
<S>                                                    <C>                  <C>
Outstanding at beginning of year.....................            --              $   --
  Granted............................................       933,000               27.18
  Exercised..........................................            --                  --
  Forfeited..........................................            --                  --
  Canceled...........................................            --                  --
                                                            -------              ------
Outstanding at end of year...........................       933,000(1)           $27.18(3)
                                                            =======              ======
Options Exercisable at end of year...................         3,000(2)           $26.17
                                                            =======              ======
</TABLE>

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

(1) The weighted average remaining contractual life approximates 9.8 years.

(2) The weighted average remaining contractual life approximates 9.6 years.

(3) The exercise prices for outstanding options range from $25.00 to $27.3438.

     The fair value of each unit option granted is estimated on the date of
grant using the Black-Scholes option pricing model with the following weighted
average assumptions: an expected volatility of 37%, a risk-free interest rate of
4.65%, an expected dividend yield of 8% and an expected term of 8 years. The
weighted average fair value of the unit options granted during the year ended
December 31, 1998 was $4.59. All of the unit options granted during 1998 were
granted at market value on the date of grant.

     Leviathan applied APB Opinion No. 25 and related interpretations in
accounting for its Option Plans, under which no compensation expense has been
recognized during 1998 as the exercise price of each grant equaled the market
price on the date of grant. Had compensation costs for the Option Plans been
determined consistent with the methodology prescribed by SFAS No. 123,
Leviathan's net income and net income per unit would have been adjusted to a net
loss of $461,000 or $0.015 per unit on a proforma basis. The effects of applying
SFAS No. 123 in this pro forma disclosure are not indicative of future amounts.

                                      F-44
<PAGE>   192
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

NOTE 8 -- RELATED PARTY TRANSACTIONS:

  Management Fees

     Substantially all of the individuals who perform the day-to-day financial,
administrative, accounting and operational functions for Leviathan as well as
those who are responsible for the direction and control of Leviathan are
currently employed by El Paso or were employed by DeepTech. Pursuant to a
management agreement between DeepTech and the General Partner, a management fee
is charged to the General Partner which is intended to approximate the amount of
resources allocated by El Paso and/or DeepTech in providing various operational,
financial, accounting and administrative services on behalf of the General
Partner and Leviathan. The management agreement expires on June 30, 2002, and
may be terminated thereafter upon 90 days notice by either party. Pursuant to
the terms of the Partnership Agreement, the General Partner is entitled to
reimbursement of all reasonable general and administrative expenses and other
reasonable expenses incurred by the General Partner and its affiliates for or on
behalf of Leviathan including, but not limited to, amounts payable by the
General Partner to DeepTech under the management agreement.

     Effective November 1, 1995, July 1, 1996 and July 1, 1997, primarily as a
result of the increased activities of Leviathan, the General Partner amended its
management agreement with DeepTech to provide for an annual management fee of
45.3%, 54% and 52%, respectively, of DeepTech's overhead. In connection with the
Merger, the General Partner amended its management agreement with DeepTech to
provide for a monthly management fee of $775,000. The General Partner charged
Leviathan $9,283,000, $8,080,000 and $6,590,000 pursuant to its management
agreement with DeepTech for the years ended December 31, 1998, 1997 and 1996,
respectively.

     The General Partner is also required to reimburse DeepTech for certain tax
liabilities resulting from, among other things, additional taxable income
allocated to the General Partner due to (i) the issuance of additional
Preference Units (including the sale of the Preference Units by Leviathan
pursuant to its second public offering) and (ii) the investment of such proceeds
in additional acquisitions or construction projects. During the years ended
December 31, 1998, 1997 and 1996, the General Partner charged Leviathan
$489,000, $713,000 and $1,162,000, respectively, to compensate DeepTech for
additional taxable income allocated to the General Partner.

  Platform Access and Transportation Agreements

     General. In 1993, Leviathan entered into a master gas dedication
arrangement with Tatham Offshore (the "Master Dedication Agreement"). Under the
Master Dedication Agreement, Tatham Offshore dedicated all production from its
Viosca Knoll, Garden Banks, Ewing Bank and Ship Shoal leases as well as certain
adjoining areas of mutual interest to Leviathan for transportation. In exchange,
Leviathan agreed to install the pipeline facilities necessary to transport
production from the areas and certain related facilities and to provide
transportation services with respect to such production. Tatham Offshore agreed
to pay certain fees for transportation services and facilities access provided
under the Master Dedication Agreement. Pursuant to the terms of the Purchase and
Sale Agreement (Note 4) and the Redemption Agreement (Note 1), a subsidiary of
Leviathan assumed all of Tatham Offshore's obligations under the Master
Dedication Agreement and certain ancillary agreements.

     Viosca Knoll. For the years ended December 31, 1998, 1997 and 1996,
Leviathan received $1,099,000, $1,973,000 and $1,896,000, respectively, from
Tatham Offshore as platform access and processing fees related to Leviathan's
platform located in Viosca Knoll Block 817.

     For the years ended December 31, 1998, 1997 and 1996, Leviathan charged
Viosca Knoll $2,447,000, $2,116,000 and $249,000, respectively, for expenses and
platform access fees related to the Viosca Knoll Block 817 platform.

                                      F-45
<PAGE>   193
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

     In addition, for the years ended December 31, 1998, 1997 and 1996, Viosca
Knoll reimbursed $152,000, $47,000 and $254,000, respectively, to Leviathan for
costs incurred by Leviathan in connection with the acquisition and installation
of a booster compressor on Leviathan's Viosca Knoll Block 817 platform.

     During the years ended December 31, 1998, 1997 and 1996, Viosca Knoll
charged Leviathan $1,881,000, $3,921,000 and $3,229,000, respectively, for
transportation services related to transporting production from the Viosca Knoll
Block 817 lease.

     Garden Banks. During the years ended December 31, 1998, 1997 and 1996,
POPCO charged Leviathan $1,445,000, $2,003,000 and $1,056,000, respectively, for
transportation services related to transporting production from the Garden Banks
Block 72 and 117 leases.

     Ewing Bank. Pursuant to a gathering agreement (the "Ewing Bank Agreement")
among Tatham Offshore, DeepTech, and a subsidiary of Leviathan, Tatham Offshore
dedicated all natural gas and crude oil produced from eight of its Ewing Bank
leases for gathering and redelivery by Leviathan and was obligated to pay a
demand and a commodity rate for shipment of all oil and natural gas under this
agreement. Pursuant to the Ewing Bank Agreement, Leviathan constructed gathering
facilities connecting Tatham Offshore's Ewing Bank 914 #2 well to a third party
platform at Ewing Bank Block 826. For the years ended December 31, 1997 and
1996, Tatham Offshore paid Leviathan demand and commodity charges of $54,000 and
$349,000, respectively, under this agreement. Additionally, through May 1997,
Leviathan received revenue from the oil and natural gas production from the
Ewing Bank 914 #2 well as a result of its 7.13% overriding royalty interest in
the well. In 1995, Tatham Offshore experienced production problems with its
Ewing Bank 914 #2 well and in March 1996, as a result of the continued
production problems, Leviathan settled all remaining unpaid demand charge
obligations under the Ewing Bank Agreement in exchange for certain consideration
as discussed below.

     Ship Shoal. Pursuant to the Master Dedication Agreement, Leviathan and
Tatham Offshore entered into a gathering and processing agreement (the "Ship
Shoal Agreement") pursuant to which Leviathan constructed a gathering line from
Tatham Offshore's Ship Shoal Block 331 to interconnect with a third-party
pipeline at Leviathan's platform and processing facilities located on Ship Shoal
Block 332 in exchange for the dedication of all of the production from Tatham
Offshore's Ship Shoal Block 331 and eight additional surrounding leases and
receipt of a demand charge of $113,000 per month over a five-year period ending
June 1999. During late 1994, all of Tatham Offshore's wells at Ship Shoal Block
331 experienced completion and production problems and in March 1996, as a
result of the continued production problems, Leviathan settled all remaining
unpaid demand charge obligations under this transportation agreement in exchange
for certain consideration as discussed below.

     Transportation Agreements Settled. Tatham Offshore was obligated to make
demand charge payments to Leviathan pursuant to the Ewing Bank and Ship Shoal
Agreements discussed above. However, production problems at Ship Shoal Block 331
and the Ewing Bank 914 #2 well affected Tatham Offshore's ability to pay the
demand charge obligations under agreements relative to these properties. As a
result, effective February 1, 1996, Leviathan released Tatham Offshore from all
remaining demand charge payments under the Ewing Bank Agreement and the Ship
Shoal Agreement, a total of $17,800,000. In exchange, Leviathan received 7,500
shares Senior Preferred Stock valued at $7,500,000 and added an additional
$7,500,000 to the payout amount under the Purchase and Sale Agreement (Note 4),
which was recorded as a noncurrent receivable. Pursuant to the Redemption
Agreement, Leviathan exchanged the Senior Preferred Stock for Tatham Offshore's
remaining assets located in the Gulf (Note 1).

     During 1997, Tatham Offshore announced its intent to reserve its remaining
costs associated with the Ewing Bank 914 #2 well and the three wellbores at Ship
Shoal Block 331 as a result of production problems. In addition, Leviathan had
determined that the designated net revenue from the Acquired

                                      F-46
<PAGE>   194
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

Properties (Note 4) was not likely to be sufficient to satisfy the payout amount
and as such, would (i) retain 100% of the net revenue from the Acquired
Properties, (ii) bear all abandonment obligations related to these properties
and (iii) not realize the $7,500,000 plus accrued interest Leviathan had
recorded as a noncurrent receivable related to the settlement of the Ewing Bank
and Ship Shoal Agreements discussed above. Accordingly, in June 1997, Leviathan
recorded as impairment, abandonment and other expense on the accompanying
consolidated statement of operations a non-recurring charge of $21,222,000 to
reserve its investment in certain gathering facilities and other assets
associated with Tatham Offshore's Ewing Bank 914 #2 well and Ship Shoal Block
331 property ($6,443,000), to fully accrue its abandonment obligations
associated with the gathering facilities serving these properties ($3,825,000),
to reserve its noncurrent receivable related to the prepayment of the demand
charge obligations under the Ewing Bank and Ship Shoal Agreements ($9,094,000)
and to accrue certain abandonment obligations associated with its Viosca Knoll
and Garden Banks properties ($1,860,000).

     During 1998, Leviathan abandoned the Ewing Bank flowlines at a cost of
$2,869,000 and recorded a credit to impairment, abandonment and other of
$1,131,000, which represented the excess of the accrued costs over the actual
costs incurred associated with the abandonment of the flowlines.

  Other

     Leviathan has agreed to sell all of its oil and natural gas production to
Offshore Gas Marketing, Inc. ("Offshore Marketing"), an affiliate of Leviathan,
on a month to month basis. The agreement with Offshore Marketing provides
Offshore Marketing fees equal to 2% of the sales value of crude oil and
condensate and $0.015 per dekatherm of natural gas for selling Leviathan's
production. During the years ended December 31, 1998, 1997 and 1996, oil and
natural gas sales to Offshore Marketing totaled $31,225,000, $57,830,000 and
$46,296,000, respectively.

     Pursuant to a management agreement between Viosca Knoll and Leviathan,
Leviathan charges Viosca Knoll a base fee of $100,000 annually in exchange for
Leviathan providing financial, accounting and administrative services on behalf
of Viosca Knoll. For each of the years ended December 31, 1998, 1997 and 1996,
Leviathan charged Viosca Knoll $100,000 in accordance with this management
agreement.

     For the years ended December 31, 1998 and 1997, Leviathan charged Manta Ray
Offshore $1,274,000 and $287,000, respectively, pursuant to management and
operations agreements.

     Mr. Grant E. Sims and Mr. James H. Lytal entered into employment agreements
with five year terms with El Paso pursuant to which they would continue to serve
as Chief Executive Officer and President, respectively, of the General Partner
and Leviathan. However, pursuant to the terms of their respective employment
agreements, Messrs. Sims and Lytal have the right to terminate such agreements
upon thirty days notice and El Paso has the right to terminate such agreements
under certain circumstances.

     Pursuant to the former Leviathan non-employee director compensation
arrangements, Leviathan was obligated to pay each non-employee director 2 1/2%
of the general partners' Incentive Distribution as a profit participation fee.
During the years ended December 31, 1998 and 1997, Leviathan paid the three non-
employee directors of Leviathan a total of $621,000 and $313,000, respectively,
as a profit participation fee. As a result of the Merger, the three non-employee
directors resigned and the compensation arrangements were terminated.

     During the years ended December 31, 1997 and 1996, Leviathan was charged
$3,351,000 and $7,223,000, respectively, by Sedco Forex Division of Schlumberger
Technology Corporation ("Sedco Forex") for contract drilling services rendered
by the semisubmersible drilling rig, the FPS Laffit Pincay, at its Garden Banks
Block 117 project. The FPS Laffit Pincay was owned by an affiliate of DeepTech
and managed by Sedco Forex during such period.

                                      F-47
<PAGE>   195
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

     POPCO, which owns the Poseidon crude oil pipeline system, entered into
certain agreements with a subsidiary of Leviathan which provided for POPCO's use
of certain pipelines and platforms owned by such subsidiary for fees which
consisted of a monthly rental fee of $100,000 per month for the period from
February 1996 to January 1997 and reimbursement of $2,000,000 of capital
expenditures incurred in readying one of the platforms for use.

     In 1996, a subsidiary of Leviathan received a performance fee of $1,400,000
for managing the construction and installation of the initial 117 mile segment
of the Poseidon crude oil pipeline system.

     Mr. Charles M. Darling IV, a director of the General Partner and DeepTech
through August 14, 1998, was a partner in a law firm until April 1997 that
provided legal services to Leviathan. During the years ended December 31, 1997
and 1996, Leviathan incurred $55,000 and $203,000, respectively, for these
services.

     Dover Technology, Inc., which is 50% owned by DeepTech, performed certain
technical and geophysical services for Leviathan in the aggregate amount of
$240,000 for the year ended December 31, 1996.

NOTE 9 -- INCOME TAXES:

     Leviathan (other than its subsidiaries, Tarpon and Manta Ray) is not
subject to federal income taxes. Therefore, no recognition has been given to
income taxes other than income taxes related to Tarpon and Manta Ray. The tax
returns of Leviathan are subject to examination; if such examinations result in
adjustments to distributive shares of taxable income or loss, the tax liability
of partners could be adjusted accordingly.

     Tarpon is and Manta Ray was, prior to its liquidation in May 1996, a
subsidiary of Leviathan that files separate federal income tax returns. The
income tax benefit recorded for the years ended December 31, 1998, 1997, and
1996 equals $471,000, $311,000 and $801,000, respectively, and is entirely
related to Tarpon. The benefit equals Tarpon's book loss times the effective
statutory rate for such period as no material book/tax permanent differences
exist. Leviathan's deferred income tax liability at December 31, 1998 and 1997
of $937,000 and $1,399,000, respectively, is entirely related to the differences
in the tax and book bases of the pipeline assets of Tarpon. In May 1996, Manta
Ray was merged with and into a subsidiary of Leviathan. Manta Ray had no taxable
income for the respective periods prior to its liquidation.

NOTE 10 -- COMMITMENTS AND CONTINGENCIES:

 Credit Facilities

     Each of POPCO, Viosca Knoll and Stingray are parties to a credit agreement
under which it has outstanding obligations that may restrict the payment of
distributions to its owners.

     POPCO has a revolving credit facility, as amended, (the "POPCO Credit
Facility") with a syndicate of commercial banks to provide up to $150 million
for the construction and expansion of Poseidon and for other working capital
needs of POPCO. POPCO's ability to borrow money under the facility is subject to
certain customary terms and conditions, including borrowing base limitations.
The POPCO Credit Facility is collateralized by a substantial portion of POPCO's
assets and matures on April 30, 2001. As of December 31, 1998 and 1997, POPCO
had $131,000,000 and $120,500,000, respectively, outstanding under its credit
facility bearing interest at an average floating rate of 6.9% and 7.2% per
annum, respectively. At December 31, 1998, POPCO had approximately $19,000,000
of additional funds available under the facility.

                                      F-48
<PAGE>   196
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

     Viosca Knoll has a revolving credit facility, as amended, (the "Viosca
Knoll Credit Facility") with a syndicate of commercial banks to provide up to
$100 million for the addition of compression to and expansion of the Viosca
Knoll system and for other working capital needs of Viosca Knoll, including
funds for a one-time distribution of $25 million to its partners. In December
1996, Leviathan received a $12,500,000 distribution from Viosca Knoll as a
result of its 50% interest in Viosca Knoll. Viosca Knoll's ability to borrow
money under its credit facility is subject to certain customary terms and
conditions, including borrowing base limitations. The Viosca Knoll Credit
Facility is collateralized by all of Viosca Knoll's material contracts and
agreements, receivables and inventory and matures on December 20, 2001. If
Viosca Knoll fails to pay any principal, interest or other amounts due pursuant
to the Viosca Knoll Credit Facility, Leviathan is obligated to pay up to a
maximum of $2,500,000 in settlement of 50% of Viosca Knoll's obligations under
the Viosca Knoll Credit Facility agreement. As of December 31, 1998 and 1997,
Viosca Knoll had $66,700,000 and $52,200,000, respectively, outstanding under
the Viosca Knoll Credit Facility bearing interest at an average floating rate of
6.7% per annum. At December 31, 1998, Viosca Knoll had approximately $33,300,000
of additional funds available under the facility. See Note 14.

     In March 1998, Stingray amended an existing term loan agreement (the
"Stingray Credit Agreement") to provide for additional borrowings of up to $11.1
million and to extend the maturity date of the loan from December 31, 2000 to
March 31, 2003. The Stingray Credit Agreement requires Stingray to make 18
quarterly principal payments of $1,583,333 commencing December 31, 1998. The
term loan agreement is principally collateralized by current and future natural
gas transportation contracts between Stingray and its customers. As of December
31, 1998 and 1997, Stingray had $26,917,000 and $17,400,000, respectively,
outstanding under the Stingray Credit Agreement bearing interest at an average
floating rate of 6.5% per annum. On the earlier to occur of March 31, 2003 or
the accelerated due date pursuant to the Stingray Credit Agreement, if Stingray
has not settled all amounts due under the Stingray Credit Agreement, Leviathan
is obligated to pay the lesser of (i) $8,500,000, (ii) the aggregate amount of
distributions received by Leviathan from Stingray subsequent to January 1, 1998,
or (iii) 50% of any then outstanding amounts due pursuant to the Stingray Credit
Agreement. Management cannot determine the likelihood of Leviathan's potential
obligation associated with the Stingray Credit Agreement.

  Hedging Activities

     Leviathan hedges a portion of its oil and natural gas production to reduce
Leviathan's exposure to fluctuations in market prices of oil and natural gas and
to meet certain requirements of the Leviathan Credit Facility. Leviathan uses
commodity price swap instruments whereby monthly settlements are based on
differences between the prices specified in the instruments and the settlement
prices of certain futures contracts quoted on the New York Mercantile Exchange
("NYMEX") or certain other indices. Leviathan settles the instruments by paying
the negative difference or receiving the positive difference between the
applicable settlement price and the price specified in the contract. The
instruments utilized by Leviathan differ from futures contracts in that there is
no contractual obligation which requires or allows for the future delivery of
the product. The credit risk from Leviathan's price swap contracts is derived
from the counter-party to the transaction, typically a major financial
institution. Management does not require collateral and does not anticipate
non-performance by this counter-party, which does not transact a sufficient
volume of transactions with Leviathan to create a significant concentration of
credit risk. Gains or losses on hedging activities are recognized as oil and gas
sales in the period in which the hedged production is sold. For the years ended
December 31, 1998, 1997 and 1996, Leviathan recorded a net (gain) loss of
($2,526,000), $6,340,000 and $2,826,000, respectively, from such activities.

     As of December 31, 1998, Leviathan had open sales swap transactions for
calendar 1999 of 10,000 million British thermal units ("MMbtu") of natural gas
per day at a fixed price to be determined at Leviathan's option equal to the
February 1999 Natural Gas Futures Contract on NYMEX as quoted at any time during
1998 and January 1999, to and including the last two trading days of the
February 1999

                                      F-49
<PAGE>   197
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

contract, minus $0.23 per MMbtu. In January 1999, Leviathan renegotiated this
contract to provide for 10,000 MMbtu of natural gas per day for calendar 2000 at
a fixed price to be determined at Leviathan's option equal to the February 2000
Natural Gas Futures Contract on NYMEX as quoted at any time during 1999 and
January 2000, to and including the last two trading days of the February 2000
contract, minus $0.5450 per MMbtu.

     Additionally, Leviathan had open sales swap transactions for calendar 2000
of 10,000 MMbtu of natural gas per day at a fixed price to be determined at
Leviathan's option equal to the January 2000 Natural Gas Futures Contract on
NYMEX as quoted at any time during 1999, to and including the last two trading
days of the January 2000 contract minus, $0.50 per MMbtu.

     If Leviathan had settled its open natural gas hedging positions as of
December 31, 1998 and 1997 based on the applicable settlement prices of the
NYMEX futures contracts, Leviathan would have recognized a loss (gain) of
approximately $2.6 million and ($2.2 million), respectively.

  Other

     Leviathan is involved from time to time in various claims, actions,
lawsuits and regulatory matters that have arisen in the ordinary course of
business, including various rate cases and other proceedings before the FERC.

     Leviathan and several subsidiaries of El Paso have been made defendants in
United States ex rel Grynberg v. El Paso Natural Gas Company, et al. litigation.
Generally, the complaint in this motion alleges an industry-wide conspiracy to
underreport the heating value as well as the volumes of the natural gas produced
from federal and Indian lands, thereby depriving the United States government of
royalties. The complaint remains sealed. Leviathan and El Paso believe the
complaint is without merit and therefore will not have a material adverse effect
on the consolidated financial position, operations or cash flows of Leviathan.

     Leviathan is a defendant in a lawsuit filed by Transco Gas Pipe Line
Corporation ("Transco") in the 157th Judicial District Court, Harris County,
Texas on August 30, 1996. Transco alleges that, pursuant to a platform lease
agreement entered into on June 28, 1994, Transco has the right to expand its
facilities and operations on the offshore platform by connecting additional
pipeline receiving and appurtenant facilities. Management has denied Transco's
request to expand its facilities and operations because the lease agreement does
not provide for such expansion and because Transco's activities will interfere
with the Manta Ray Offshore system and Leviathan's existing and planned
activities on the platform. Transco has requested a declaratory judgment and is
seeking damages. The case is set for trial in June 1999. It is the opinion of
management that adequate defenses exist and that the final disposition of this
suit individually, and all of Leviathan's other pending legal proceedings in the
aggregate, will not have a material adverse effect on the consolidated financial
position, operations or cash flows of Leviathan.

     In the ordinary course of business, Leviathan is subject to various laws
and regulations. In the opinion of management, compliance with existing laws and
regulations will not materially affect the consolidated financial position,
operations or cash flows of Leviathan. Various legal actions which have arisen
in the ordinary course of business are pending with respect to the pipeline
interests and other assets of Leviathan. Management believes that the ultimate
disposition of these actions, either individually or in the aggregate, will not
have a material adverse effect on the consolidated financial position,
operations or cash flows of Leviathan.

                                      F-50
<PAGE>   198
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

NOTE 11 -- SUPPLEMENTAL DISCLOSURES TO THE STATEMENT OF CASH FLOWS:

  Cash paid, net of amounts capitalized, during each of the periods presented

<TABLE>
<CAPTION>
                                                            YEAR ENDED DECEMBER 31,
                                                           --------------------------
                                                            1998      1997      1996
                                                           -------   -------   ------
                                                                 (In thousands)
<S>                                                        <C>       <C>       <C>
Interest.................................................  $17,608   $12,965   $2,890
Taxes....................................................  $    --   $    11   $   20
</TABLE>

  Supplemental disclosures of noncash investing and financing activities

<TABLE>
<CAPTION>
                                                            YEAR ENDED DECEMBER 31,
                                                          ---------------------------
                                                           1998      1997      1996
                                                          -------   -------   -------
                                                                (In thousands)
<S>                                                       <C>       <C>       <C>
Decrease (increase) in investment in Tatham Offshore....  $ 7,500   $    --   $(7,500)
Additions to oil and natural gas properties.............   (4,683)       --        --
Additions to platform and facilities....................   (7,024)       --        --
Assumption of abandonment obligations...................    4,033        --        --
Increase in other noncurrent receivable.................       --        --    (7,500)
Increase in deferred revenue............................       --        --    15,000
Conveyance of assets and liabilities to POPCO...........       --        --    29,758
Conveyance of assets and liabilities to Manta Ray
  Offshore and Nautilus.................................       30    72,080        --
</TABLE>

NOTE 12 -- MAJOR CUSTOMERS:

     As discussed in Note 8, Leviathan sells substantially all of its oil and
natural gas production to Offshore Marketing.

     The percentage of gathering, transportation and platform services revenue
from major customers was as follows:

<TABLE>
<CAPTION>
                                                              YEAR ENDED DECEMBER 31,
                                                              -----------------------
                                                              1998     1997     1996
                                                              -----    -----    -----
                                                                  (In thousands)
<S>                                                           <C>      <C>      <C>
Kerr-McGee Corporation......................................   32%      --       --
Texaco Gas Marketing, Inc...................................   10%      13%      --
Viosca Knoll................................................   13%      --       --
Walter Oil & Gas Corporation................................    7%      13%      --
Shell Gas Trading Company...................................   --       --       17%
Tatham Offshore.............................................   --       --       30%
</TABLE>

                                      F-51
<PAGE>   199
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

NOTE 13 -- BUSINESS SEGMENT INFORMATION:

     Leviathan's operations consist of three segments: (i) gathering,
transportation and platform services, (ii) oil and natural gas and (iii) equity
investments. All of Leviathan's operations are conducted in the Gulf. The
gathering, transportation and platform services segment owns interests in
natural gas systems and platforms strategically located offshore Texas,
Louisiana and Mississippi that provides services to producers, marketers, other
pipelines and end-users for a fee. Leviathan is engaged in the development and
production of hydrocarbons through its oil and natural gas segment (Note 4).
Equity investments primarily include Leviathan's nonregulated and regulated
gathering and transportation activities that are conducted through joint
ventures, organized as general partnerships or limited liability companies, with
subsidiaries of major energy companies. The operational and administrative
activities of Leviathan's equity investments are primarily conducted by the
major energy companies and management decisions related to the operations are
made by management committees comprised of representatives of each partner or
member, as applicable, with authority appointed in direct relationship to
ownership interests (Note 3). Leviathan evaluates segment performance based on
operating net cash flows. The accounting policies of the individual segments are
the same as those of Leviathan, as a whole, as described in Note 2. The
following table summarizes certain financial information for each business
segment (in thousands):

<TABLE>
<CAPTION>
                                        GATHERING,
                                      TRANSPORTATION
                                       AND PLATFORM      OIL AND       EQUITY                 INTERSEGMENT
                                         SERVICES      NATURAL GAS   INVESTMENTS   SUBTOTAL   ELIMINATIONS    TOTAL
                                      --------------   -----------   -----------   --------   ------------   --------
<S>                                   <C>              <C>           <C>           <C>        <C>            <C>
YEAR ENDED DECEMBER 31, 1998:
  Revenue from external customers...     $ 17,320       $ 31,411       $26,724     $ 75,455     $     --     $ 75,455
  Intersegment revenue..............       10,673             --            --       10,673      (10,673)          --
  Depreciation, depletion and
    amortization....................       (7,134)       (22,133)           --      (29,267)          --      (29,267)
  Impairment, abandonment and
    other...........................        1,131             --            --        1,131           --        1,131
  Operating income (loss)...........        9,128        (10,271)       20,904       19,761           --       19,761
YEAR ENDED DECEMBER 31, 1997:
  Revenue from external customers...     $ 17,329       $ 58,106       $29,327     $104,762     $     --     $104,762
  Intersegment revenue..............       11,162             --            --       11,162      (11,162)          --
  Depreciation, depletion and
    amortization....................       (9,900)       (36,389)           --      (46,289)          --      (46,289)
  Impairment, abandonment and
    other...........................      (10,268)       (10,954)           --      (21,222)          --      (21,222)
  Operating income (loss)...........       (1,278)        (9,676)       22,192       11,238           --       11,238
YEAR ENDED DECEMBER 31, 1996:
  Revenue from external customers...     $ 24,005       $ 47,068       $20,434     $ 91,507     $     --     $ 91,507
  Intersegment revenue..............       10,052             --            --       10,052      (10,052)          --
  Depreciation, depletion and
    amortization....................      (15,002)       (16,729)           --      (31,731)          --      (31,731)
  Operating income..................        9,787         15,489        16,892       42,168           --       42,168
</TABLE>

NOTE 14 -- SUBSEQUENT EVENTS:

  Acquisition of Additional Interest in Viosca Knoll Gathering Company, the
Issuance of Common Units to the General Partner and the Amendment to the
Partnership Agreement

     Currently, Viosca Knoll is effectively owned 50% by Leviathan and 50% by El
Paso (Note 3). In January 1999, Leviathan announced its intent to acquire all of
El Paso's interest in Viosca Knoll, other than a 1% interest in profits and
capital of Viosca Knoll, for approximately $85.26 million (subject to
adjustment), comprised of 25% cash (up to a maximum of $21.315 million) and 75%
Common Units (up

                                      F-52
<PAGE>   200
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

to a maximum of 3,205,263 Common Units), the number of which will depend on the
average closing price of Common Units during the applicable trading reference
period. At the closing, (i) El Paso will contribute to Viosca Knoll an amount of
money equal to 50% of the amount then outstanding under the Viosca Knoll Credit
Facility (currently a total of $66.7 million is outstanding), (ii) Leviathan
will deliver to El Paso the cash and Common Units discussed above and (iii) as
required by the Partnership Agreement, the General Partner will contribute
approximately $650,000 to Leviathan in order to maintain its 1% capital account
balance. Then, during the six month period commencing on the day after the first
anniversary of that closing date, Leviathan would have the option to acquire the
remaining 1% in profits and capital in Viosca Knoll for a cash payment equal to
the sum of $1.74 million plus the amount of additional distributions which would
have been paid, accrued or been in arrears had Leviathan acquired the remaining
1% of Viosca Knoll at the initial closing by issuing additional Common Units in
lieu of a cash payment of $1.74 million.

     The number of units actually issued by Leviathan will vary depending on the
market price of Common Units during the applicable trading reference period.
Such number will be determined by dividing $63.945 million (subject to
adjustment) by the average closing sales price for a Common Unit on the NYSE for
the ten day trading period ending two days prior to the closing date (the
"Market Price"); provided that, for purposes of such calculation, the Market
Price will not be less than $19.95 per Common Unit or more than $24.15 per
Common Unit. Accordingly, Leviathan will neither issue less than 2,647,826 nor
more than 3,205,263 Common Units, subject to adjustments contemplated by the
definitive agreements. Based on the closing sales price of the Common Units on
March 5, 1999 of $20.875 per unit, Leviathan would issue 3,063,234 Common Units
to El Paso, which issuance would constitute approximately 10.9% of the units
(Common and Preference) outstanding immediately after such issuance and would
result in El Paso owning, indirectly through its subsidiaries, a combined 35.4%
effective interest in Leviathan, consisting of a 1% general partnership
interest, a 33.4% limited partnership interest comprised of 9,355,128 Common
Units and an approximate 1% nonmanaging interest in certain subsidiaries of
Leviathan.

     Although certain federal and state securities laws would otherwise limit El
Paso's ability to dispose of any Common Units held by it, El Paso would have the
right on three occasions to require Leviathan to file a registration statement
covering such Common Units and to participate in offerings made pursuant to
certain other registration statements filed by Leviathan during a ten year
period. Such registrations would be at Leviathan's expense and, generally, would
allow El Paso to dispose of all or any of its Common Units. If the acquisition
is consummated, there can be no assurance regarding how long El Paso may hold
any of its Common Units or whether El Paso's disposition of a significant number
of Common Units in a short period of time would not depress the market price of
the Common Units.

     Upon consummation of the acquisition, Leviathan would be the beneficial
owner of 99% of Viosca Knoll and have the option to acquire the remaining 1%
interest. Leviathan and El Paso entered into a Contribution Agreement dated
January 22, 1999, which is effective as of January 1, 1999. Consummation of the
acquisition is subject to the satisfaction of certain closing conditions,
including, among other things, obtaining certain third party consents. The
consent of the lenders under the Leviathan Credit Facility and the Viosca Knoll
Credit Facility must be obtained prior to consummating this transaction. There
can be no assurance that all such required consents will be obtained. Management
believes that the acquisition of the Viosca Knoll interest does not require any
federal, state or other regulatory approval.

     On January 19, 1999, the Board of Directors of the General Partner
unanimously approved and ratified and recommended that the unitholders approve
and ratify the acquisition of the additional Viosca Knoll interest. Based upon,
among other things, a multi-faceted review and analysis of the acquisition, as
well as the recommendation for approval and ratification from the Special
Committee of independent directors and the fairness opinion of an independent
financial advisor, the Board of Directors of the

                                      F-53
<PAGE>   201
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

General Partner believes that the acquisition is fair to and in the best
interests of Leviathan and its unitholders. On March 5, 1999, the unitholders of
record as of January 28, 1999, held a meeting and ratified and approved (i) the
transactions relating to Leviathan's acquisition of El Paso's interest in Viosca
Knoll and (ii) an amendment of the Partnership Agreement to decrease the vote
required for approval of certain actions, including the removal of the general
partner without cause, from 66 2/3% to 55%.

     If the remaining conditions to closing are satisfied, including obtaining
certain third party consents, management believes that the closing of the
acquisition of the Viosca Knoll interest will occur during the second quarter of
1999.

  Joint Venture Restructuring and New Pipeline Construction

     In December 1998, the partners of High Island Offshore System, a Delaware
partnership between Leviathan (40%), subsidiaries of ANR Pipeline Company
("ANR") (40%) and a subsidiary of Natural Gas Pipeline Company ("NGPL") (20%),
restructured the joint venture arrangement by (i) creating a holding company,
Western Gulf Holdings, L.L.C. ("Western Gulf"), (ii) converting High Island
Offshore System, which owns a jurisdictional natural gas pipeline located in the
Gulf, into a limited liability company, HIOS and (iii) forming a new limited
liability company, East Breaks Gathering Company, L.L.C. ("East Breaks") to
construct and operate a non-jurisdictional natural gas pipeline system. Western
Gulf, owned 40% by Leviathan, 40% by ANR and 20% by NGPL, owns 100% of each of
HIOS and East Breaks.

     In February 1999, Western Gulf entered into a $100 million revolving credit
facility (the "Western Gulf Credit Facility") with a syndicate of commercial
banks to provide funds for the construction of the East Breaks system and for
other working capital needs of Western Gulf. The ability of Western Gulf to
borrow money under its credit facility is subject to certain customary terms and
conditions, including borrowing base limitations. The credit facility is
collateralized by substantially all of the material contracts and agreements of
East Breaks and Western Gulf including Western Gulf's ownership in HIOS and East
Breaks, and matures in February 2004. As of March 10, 1999, Western Gulf had
$44.1 million outstanding under its credit facility bearing interest at an
average floating rate of 6.4% per annum and $55.9 million of additional funds
were available under the credit facility.

     The East Breaks system will initially consist of 85 miles of an 18 to
20-inch pipeline and related facilities connecting the Diana/Hoover prospects
developed by Exxon Company USA ("Exxon") and BP Amoco Plc ("BP Amoco") in
Alaminos Canyon Block 25 in the Gulf, with the HIOS system. The majority of the
construction of the East Breaks system will occur in 1999 and the system is
anticipated to be in service in late 2000 at an estimated cost of approximately
$90 million. East Breaks entered into long-term agreements with Exxon and BP
Amoco involving the commitment, gathering and processing of production from the
Diana/Hoover prospects. All of the natural gas to be produced from 11 blocks in
the East Breaks and Alaminos Canyon areas will be dedicated for transportation
services on the HIOS system.

NOTE 15 -- SUPPLEMENTAL OIL AND NATURAL GAS INFORMATION (UNAUDITED):

  Oil and natural gas reserves

     The following table represents Leviathan's net interest in estimated
quantities of developed and undeveloped reserves of crude oil, condensate and
natural gas and changes in such quantities at fiscal year end 1998, 1997 and
1996. Estimates of Leviathan's reserves at December 31, 1998, 1997 and 1996 have
been made by the independent engineering consulting firm, Netherland, Sewell &
Associates, Inc. Net proved reserves are the estimated quantities of crude oil
and natural gas which geological and engineering data demonstrate with
reasonable certainty to be recoverable in future years from known reservoirs
under existing economic and operating conditions. Proved developed reserves are
proved reserve volumes that can

                                      F-54
<PAGE>   202
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

be expected to be recovered through existing wells with existing equipment and
operating methods. Proved undeveloped reserves are proved reserve volumes that
are expected to be recovered from new wells on undrilled acreage or from
existing wells where a significant expenditure is required for recompletion.

     Estimates of reserve quantities are based on sound geological and
engineering principles, but, by their very nature, are still estimates that are
subject to substantial upward or downward revision as additional information
regarding producing fields and technology becomes available.

<TABLE>
<CAPTION>
                                                             OIL/CONDENSATE   NATURAL GAS
                                                               (BARRELS)         (MCF)
                                                             --------------   -----------
                                                                    (In thousands)
<S>                                                          <C>              <C>
Proved reserves -- December 31, 1995.......................      4,323           61,292
  Revisions of previous estimates..........................       (734)          (4,823)
  Extensions, discoveries and other additions..............        294            3,832
  Production...............................................       (421)         (15,787)
                                                                 -----          -------
Proved reserves -- December 31, 1996.......................      3,462           44,514
  Revisions of previous estimates..........................       (542)           5,441
  Production...............................................       (801)         (19,792)
                                                                 -----          -------
Proved reserves -- December 31, 1997.......................      2,119           30,163
  Revisions of previous estimates..........................        (33)           1,833
  Purchase of reserves in place............................         32            8,212
  Production...............................................       (540)         (11,324)
                                                                 -----          -------
Proved reserves -- December 31, 1998.......................      1,578           28,884
                                                                 =====          =======
Proved developed reserves -- December 31, 1996.............      3,149           44,075
                                                                 =====          =======
Proved developed reserves -- December 31, 1997.............      2,119           28,324
                                                                 =====          =======
Proved developed reserves -- December 31, 1998.............      1,578           26,432
                                                                 =====          =======
</TABLE>

     In general, estimates of economically recoverable oil and natural gas
reserves and of the future net revenue therefrom are based upon a number of
variable factors and assumptions, such as historical production from the subject
properties, the assumed effects of regulation by governmental agencies and
assumptions concerning future oil and natural gas prices, future operating costs
and future plugging and abandonment costs, all of which may vary considerably
from actual results. All such estimates are to some degree speculative, and
classifications of reserves are only attempts to define the degree of
speculation involved. For these reasons, estimates of the economically
recoverable oil and natural gas reserves attributable to any particular group of
properties, classifications of such reserves based on risk of recovery and
estimates of the future net revenue expected therefrom, prepared by different
engineers or by the same engineers at different times, may vary substantially.
The meaningfulness of such estimates is highly dependent upon the assumptions
upon which they are based.

     Furthermore, Leviathan's wells have only been producing for a short period
of time and, accordingly, estimates of future production are based on this
limited history. Estimates with respect to proved undeveloped reserves that may
be developed and produced in the future are often based upon volumetric
calculations and upon analogy to similar types of reserves rather than upon
actual production history. Estimates based on these methods are generally less
reliable than those based on actual production history. Subsequent evaluation of
the same reserves based upon production history will result in variations, which
may be substantial, in the estimated reserves. A significant portion of
Leviathan's reserves is based upon volumetric calculations.

                                      F-55
<PAGE>   203
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

  Future net cash flows

     The standardized measure of discounted future net cash flows relating to
Leviathan's proved oil and natural gas reserves is calculated and presented in
accordance with SFAS No. 69, "Disclosures About Oil and Gas Producing
Activities." Accordingly, future cash inflows were determined by applying
year-end oil and natural gas prices, as adjusted for hedging and other fixed
price contracts in effect, to Leviathan's estimated share of future production
from proved oil and natural gas reserves. The average prices utilized in the
calculation of the standardized measure of discounted future net cash flows at
December 31, 1998 were $9.80 per barrel of oil and $1.53 per Mcf of gas. Future
production and development costs were computed by applying year-end costs to
future years. As Leviathan is not a taxable entity, no future income taxes were
provided. A prescribed 10% discount factor was applied to the future net cash
flows.

     In Leviathan's opinion, this standardized measure is not a representative
measure of fair market value, and the standardized measure presented for
Leviathan's proved oil and natural gas reserves is not representative of the
reserve value. The standardized measure is intended only to assist financial
statement users in making comparisons between companies.

<TABLE>
<CAPTION>
                                                                DECEMBER 31,
                                                       ------------------------------
                                                         1998       1997       1996
                                                       --------   --------   --------
                                                               (In thousands)
<S>                                                    <C>        <C>        <C>
Future cash inflows..................................  $ 53,299   $104,192   $206,311
Future production costs..............................   (13,412)   (15,895)   (13,019)
Future development costs.............................   (10,566)   (10,463)    (5,328)
Future income tax expenses...........................        --         --         --
                                                       --------   --------   --------
Future net cash flows................................    29,321     77,834    187,964
Annual discount at 10% rate..........................    (2,649)   (10,468)   (32,326)
                                                       --------   --------   --------
Standardized measure of discounted future net cash
  flows..............................................  $ 26,672   $ 67,366   $155,638
                                                       ========   ========   ========
</TABLE>

<TABLE>
<CAPTION>
                                                               DECEMBER 31, 1998
                                                      ------------------------------------
                                                       PROVED         PROVED
                                                      DEVELOPED    UNDEVELOPED      TOTAL
                                                      ---------   --------------   -------
                                                                 (In thousands)
<S>                                                   <C>         <C>              <C>
Undiscounted estimated future net cash flows from
  proved reserves before income taxes...............   $28,457         $864        $29,321
                                                       =======         ====        =======
Present value of estimated future net cash flows
  from proved reserves before income taxes,
  discounted at 10%.................................   $26,131         $541        $26,672
                                                       =======         ====        =======
</TABLE>

                                      F-56
<PAGE>   204
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

     The following are the principal sources of change in the standardized
measure (in thousands):

<TABLE>
<CAPTION>
                                                         1998       1997       1996
                                                       --------   --------   --------
<S>                                                    <C>        <C>        <C>
Beginning of year....................................  $ 67,366   $155,638   $115,170
  Sales and transfers of oil and natural gas
     produced, net of production costs...............   (22,131)   (53,492)   (40,420)
  Net changes in prices and production costs.........   (32,129)   (35,645)    45,358
  Extensions, discoveries and improved recovery, less
     related costs...................................        --         --     17,077
  Oil and natural gas development costs incurred
     during the year.................................       120     11,140     57,501
  Changes in estimated future development costs......      (443)   (12,439)   (29,421)
  Revisions of previous quantity estimates...........     1,920     (3,817)   (19,686)
  Purchase of reserves in place......................     7,573         --         --
  Accretion of discount..............................     6,736     15,564     11,517
  Changes in production rates, timing and other......    (2,340)    (9,583)    (1,458)
                                                       --------   --------   --------
End of year..........................................  $ 26,672   $ 67,366   $155,638
                                                       ========   ========   ========
</TABLE>

                                      F-57
<PAGE>   205
             LEVIATHAN GAS PIPELINE PARTNERS, L.P. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

NOTE 16 -- SUPPLEMENTAL QUARTERLY FINANCIAL INFORMATION (UNAUDITED):

<TABLE>
<CAPTION>
                                                                   YEAR 1998
                                           ---------------------------------------------------------
                                                            QUARTER ENDED
                                           -----------------------------------------------
                                           MARCH 31   JUNE 30   SEPTEMBER 30   DECEMBER 31    YEAR
                                           --------   -------   ------------   -----------   -------
                                                   (In thousands, except for per Unit data)
<S>                                        <C>        <C>       <C>            <C>           <C>
Revenue..................................  $17,714    $18,373     $18,230        $21,138     $75,455
Gross profit(a)..........................  $ 7,010    $ 8,687     $ 8,165        $10,957     $34,819
Net income (loss)........................  $(1,424)   $ 1,510     $(1,806)       $ 2,466     $   746
Basic and diluted net income (loss) per
  unit...................................  $ (0.05)   $  0.05     $ (0.06)       $  0.08     $  0.02
Weighted average number of Units
  outstanding............................   24,367     24,367      24,367         24,367      24,367
Distributions declared per Common Unit...  $ 0.525    $ 0.525     $ 0.525        $ 0.525     $  2.10
Distributions declared per Preference
  Unit...................................  $ 0.525    $ 0.525     $ 0.275        $ 0.275     $  1.60
</TABLE>

<TABLE>
<CAPTION>
                                                                    YEAR 1997
                                           -----------------------------------------------------------
                                                            QUARTER ENDED
                                           ------------------------------------------------
                                           MARCH 31   JUNE 30    SEPTEMBER 30   DECEMBER 31     YEAR
                                           --------   --------   ------------   -----------   --------
                                                    (In thousands, except for per Unit data)
<S>                                        <C>        <C>        <C>            <C>           <C>
Revenue..................................  $31,028    $ 28,226     $25,474        $20,034     $104,762
Gross profit(a)..........................  $13,980    $ 11,289     $11,311        $10,541     $ 47,121
Net income (loss)........................  $ 8,964    $(15,855)    $ 3,274        $ 2,479     $ (1,138)
Basic and diluted net income (loss) per
  unit...................................  $  0.32    $  (0.58)    $  0.12        $  0.08     $  (0.06)
Weighted average number of Units
  outstanding............................   24,367      24,367      24,367         24,367       24,367
Distributions declared per Preference and
  Common Unit............................  $ 0.425    $   0.45     $ 0.475        $  0.50     $   1.85
</TABLE>

<TABLE>
<CAPTION>
                                                                   YEAR 1996
                                           ---------------------------------------------------------
                                                            QUARTER ENDED
                                           -----------------------------------------------
                                           MARCH 31   JUNE 30   SEPTEMBER 30   DECEMBER 31    YEAR
                                           --------   -------   ------------   -----------   -------
                                                   (In thousands, except for per Unit data)
<S>                                        <C>        <C>       <C>            <C>           <C>
Revenue..................................  $19,637    $18,562     $24,214        $29,094     $91,507
Gross profit(a)..........................  $12,437    $10,792     $13,246        $14,233     $50,708
Net income (loss)........................  $10,910    $ 9,161     $10,006        $ 8,615     $38,692
Basic and diluted net income (loss) per
  unit...................................  $  0.44    $  0.37     $  0.41        $  0.35     $  1.57
Weighted average number of Units
  outstanding............................   24,367     24,367      24,367         24,367      24,367
Distributions declared per Preference and
  Common Unit............................  $ 0.325    $  0.35     $ 0.375        $  0.40     $  1.45
</TABLE>

- ---------------
(a) Represent revenue less operating and depreciation, depletion and
    amortization expenses.

                                      F-58
<PAGE>   206

                       REPORT OF INDEPENDENT ACCOUNTANTS

To the Board of Directors and Stockholder of
Leviathan Finance Corporation

     In our opinion, the accompanying balance sheet presents fairly, in all
material respects, the financial position of Leviathan Finance Corporation (the
"Company") at April 30, 1999 in conformity with generally accepted accounting
principles. This financial statement is the responsibility of the Company's
management; our responsibility is to express an opinion on this financial
statement based on our audit. We conducted our audit of this statement in
accordance with generally accepted auditing standards which require that we plan
and perform the audit to obtain reasonable assurance about whether the financial
statement is free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statement, assessing the accounting principles used and significant estimates
made by management, and evaluating the overall financial statement presentation.
We believe that our audit provides a reasonable basis for the opinion expressed
above.

                                          PricewaterhouseCoopers LLP

Houston, Texas
May 3, 1999

                                      F-59
<PAGE>   207

                         LEVIATHAN FINANCE CORPORATION
      (A WHOLLY OWNED SUBSIDIARY OF LEVIATHAN GAS PIPELINE PARTNERS, L.P.)

                                 BALANCE SHEET

                                 APRIL 30, 1999

<TABLE>
<S>                                                            <C>
                           ASSETS

Subscription receivable from parent.........................   $1,000
                                                               ------
          Total assets......................................   $1,000
                                                               ======

                    STOCKHOLDER'S EQUITY

Common stock, $1.00 par value, 1,000 shares authorized;
  1,000 issued and outstanding..............................   $1,000
                                                               ------
          Total stockholder's equity........................   $1,000
                                                               ======
</TABLE>

     The accompanying note is an integral part of this financial statement.
                                      F-60
<PAGE>   208

                         LEVIATHAN FINANCE CORPORATION
      (A WHOLLY OWNED SUBSIDIARY OF LEVIATHAN GAS PIPELINE PARTNERS, L.P.)

                             NOTE TO BALANCE SHEET

NOTE 1 -- ORGANIZATION:

     Leviathan Finance Corporation (the "Company"), a Delaware corporation, was
formed on April 30, 1999 for the sole purpose of co-issuing $175,000,000
aggregate principal amount of Senior Subordinated Notes due May 2009 (the
"Notes") with Leviathan Gas Pipeline Partners, L.P. ("Leviathan"), the Company's
parent. Leviathan, a publicly held Delaware master limited partnership, is
primarily engaged in the gathering, transportation and production of natural gas
and crude oil in the Gulf of Mexico. Through its subsidiaries and joint
ventures, Leviathan owns interests in significant assets, including (i) eight
natural gas pipelines, (ii) a crude oil pipeline system, (iii) six
strategically-located multi-purpose platforms, (iv) a dehydration facility, (v)
four producing oil and natural gas properties and (vi) one undeveloped oil and
natural gas property.

     The Company's subscription receivable was generated from the initial
capitalization of the Company in which the Company issued 1,000 shares of common
stock at $1.00 par value. The Company has not conducted any operations and all
activities have related to the issuance of the Notes.

                                      F-61
<PAGE>   209

                       REPORT OF INDEPENDENT ACCOUNTANTS

To the Partners of Viosca Knoll Gathering
  Company (a Delaware general partnership)

     In our opinion, the accompanying balance sheet and the related statements
of operations, of cash flows and of partners' capital present fairly, in all
material respects, the financial position of Viosca Knoll Gathering Company (a
Delaware general partnership) ("Viosca Knoll") as of December 31, 1998 and 1997,
and the results of its operations and its cash flows for each of the three years
in the period ended December 31, 1998 in conformity with generally accepted
accounting principles. These financial statements are the responsibility of
Viosca Knoll's management; our responsibility is to express an opinion on these
financial statements based on our audits. We conducted our audits in accordance
with generally accepted auditing standards which require that we plan and
perform the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statements, assessing the accounting principles used and significant estimates
made by management, and evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for the opinion expressed
above.

                                          PricewaterhouseCoopers LLP

Houston, Texas
March 19, 1999

                                      F-62
<PAGE>   210

                         VIOSCA KNOLL GATHERING COMPANY
                        (A DELAWARE GENERAL PARTNERSHIP)

                                 BALANCE SHEET
                                 (In thousands)


<TABLE>
<CAPTION>
                                                                               DECEMBER 31,
                                                               JUNE 30,     -------------------
                                                                 1999         1998       1997
                                                              -----------   --------   --------
                                                              (UNAUDITED)
<S>                                                           <C>           <C>        <C>
                           ASSETS
Current assets:
  Cash and cash equivalents.................................   $    182     $    155   $    135
  Accounts receivable.......................................      3,068        4,885      2,658
  Accounts receivable from affiliates.......................      1,590          179        561
  Other current assets......................................        232          232         --
                                                               --------     --------   --------
          Total current assets..............................      5,072        5,451      3,354
                                                               --------     --------   --------
  Property and equipment:
     Pipelines..............................................    145,652      108,121    103,121
     Construction-in-progress...............................         67           --      1,449
     Other..................................................         77           77         24
                                                               --------     --------   --------
                                                                145,796      108,198    104,594
     Less: Accumulated depreciation.........................     12,811       10,662      6,886
                                                               --------     --------   --------
       Property, plant and equipment, net...................    132,985       97,536     97,708
                                                               --------     --------   --------
Debt issue costs, net.......................................         --          222        296
                                                               --------     --------   --------
          Total assets......................................   $138,057     $103,209   $101,358
                                                               ========     ========   ========

             LIABILITIES AND PARTNERS' CAPITAL
Current liabilities:
  Accounts payable..........................................   $     27     $    414   $  3,841
  Accounts payable to affiliates............................        155          552        851
  Accrued liabilities.......................................      5,102           55      6,588
                                                               --------     --------   --------
          Total current liabilities.........................      5,284        1,021     11,280
Provision for negative salvage..............................        382          340        256
Notes payable...............................................         --       66,700     52,200
                                                               --------     --------   --------
                                                                  5,666       68,061     63,736
                                                               --------     --------   --------
Commitments and contingencies (Note 5)
Partners' capital:
  VK Deepwater..............................................    131,389       17,574     18,811
  EPEC Deepwater............................................      1,002       17,574     18,811
                                                               --------     --------   --------
                                                                132,391       35,148     37,622
                                                               --------     --------   --------
          Total liabilities and partners' capital...........   $138,057     $103,209   $101,358
                                                               ========     ========   ========
</TABLE>


    The accompanying notes are an integral part of this financial statement.
                                      F-63
<PAGE>   211

                         VIOSCA KNOLL GATHERING COMPANY
                        (A DELAWARE GENERAL PARTNERSHIP)

                            STATEMENT OF OPERATIONS
                                 (In thousands)


<TABLE>
<CAPTION>
                                                  SIX MONTHS
                                                ENDED JUNE 30,       YEAR ENDED DECEMBER 31,
                                               -----------------   ---------------------------
                                                1999      1998      1998      1997      1996
                                               -------   -------   -------   -------   -------
                                                  (UNAUDITED)
<S>                                            <C>       <C>       <C>       <C>       <C>
Revenue:
  Transportation services....................  $14,743   $14,314   $28,806   $23,128   $13,923
  Oil and natural gas sales..................       49       432       528        --        --
                                               -------   -------   -------   -------   -------
                                                14,792    14,746    29,334    23,128    13,923
                                               -------   -------   -------   -------   -------
Costs and expenses:
  Operating expenses.........................    1,129     1,181     2,877     1,990       298
  Depreciation...............................    2,191     1,893     3,860     2,474     2,269
  General and administrative expenses........       71        82       154       125       126
                                               -------   -------   -------   -------   -------
                                                 3,391     3,156     6,891     4,589     2,693
                                               -------   -------   -------   -------   -------

Operating income.............................   11,401    11,590    22,443    18,539    11,230
Interest income..............................       33        23        50        40        --
Interest and other financing costs...........   (1,973)   (1,989)   (4,267)   (1,959)      (90)
                                               -------   -------   -------   -------   -------

Net income...................................  $ 9,461   $ 9,624   $18,226   $16,620   $11,140
                                               =======   =======   =======   =======   =======
</TABLE>


    The accompanying notes are an integral part of this financial statement.
                                      F-64
<PAGE>   212

                         VIOSCA KNOLL GATHERING COMPANY
                        (A DELAWARE GENERAL PARTNERSHIP)

                            STATEMENT OF CASH FLOWS
                                 (In thousands)


<TABLE>
<CAPTION>
                                              SIX MONTHS
                                            ENDED JUNE 30,         YEAR ENDED DECEMBER 31,
                                          -------------------   ------------------------------
                                            1999       1998       1998       1997       1996
                                          --------   --------   --------   --------   --------
                                              (UNAUDITED)
<S>                                       <C>        <C>        <C>        <C>        <C>
Cash flows from operating activities:
  Net income............................  $  9,461   $  9,624   $ 18,226   $ 16,620   $ 11,140
  Adjustments to reconcile net income to
   net cash provided by operating
   activities:
     Depreciation.......................     2,191      1,893      3,860      2,474      2,269
     Amortization of debt issue costs...       222         37         74         73         --
     Changes in operating working
       capital:
       Decrease (increase) in accounts
          receivable....................     1,817       (496)    (2,227)       340     (1,462)
       (Increase) decrease in accounts
          receivable from affiliates....    (1,411)       546        382        573     (1,046)
       Increase in other current
          assets........................        --         --       (232)        --         --
       (Decrease) increase in accounts
          payable.......................      (387)    (3,572)    (3,427)     1,937      1,557
       (Decrease) increase in accounts
          payable to affiliates.........      (397)      (498)      (299)       513     (2,312)
       Decrease (increase) in accrued
          liabilities...................       (53)    (6,538)    (6,533)     6,328       (251)
                                          --------   --------   --------   --------   --------
          Net cash provided by operating
            activities..................    11,443        996      9,824     28,858      9,895
                                          --------   --------   --------   --------   --------

Cash flows from investing activities:
  Additions to pipeline assets..........       (49)    (1,179)    (3,604)   (27,541)    (5,219)
  Construction-in-progress..............       (67)        --         --     (1,449)    (3,410)
                                          --------   --------   --------   --------   --------
          Net cash used in investing
            activities..................      (116)    (1,179)    (3,604)   (28,990)    (8,629)
                                          --------   --------   --------   --------   --------
Cash flows from financing activities:
  Proceeds from notes payable...........        --     11,800     14,500     18,900     33,300
  Repayment of notes payable............   (66,700)        --         --         --         --
  Contributions from partners...........    68,100         --         --        320      3,018
  Distributions to partners.............   (12,700)   (11,600)   (20,700)   (19,300)   (36,900)
  Debt issue costs......................        --         --         --        (70)      (300)
                                          --------   --------   --------   --------   --------
          Net cash (used in) provided by
            financing activities........   (11,300)       200     (6,200)      (150)      (882)
                                          --------   --------   --------   --------   --------

Net increase (decrease) in cash and cash
  equivalents...........................        27         17         20       (282)       384
Cash and cash equivalents at beginning
  of year...............................       155        135        135        417         33
                                          --------   --------   --------   --------   --------
Cash and cash equivalents at end of
  period................................  $    182   $    152   $    155   $    135   $    417
                                          ========   ========   ========   ========   ========
Cash paid for interest, net of amounts
  capitalized...........................  $  1,804   $  1,943   $  4,180   $  1,878   $     --
                                          ========   ========   ========   ========   ========
Noncash investing activities:
  Additions to pipeline assets offset by
  additions to accrued liabilities......  $  5,100   $     --   $     --   $     --   $     --
                                          ========   ========   ========   ========   ========
</TABLE>


    The accompanying notes are an integral part of this financial statement.
                                      F-65
<PAGE>   213

                         VIOSCA KNOLL GATHERING COMPANY
                        (A DELAWARE GENERAL PARTNERSHIP)

                         STATEMENT OF PARTNERS' CAPITAL
                                 (In thousands)


<TABLE>
<CAPTION>
                                                                 VK         EPEC
                                                              DEEPWATER   DEEPWATER     TOTAL
                                                              ---------   ---------   ---------
<S>                                                           <C>         <C>         <C>
Partners' capital at December 31, 1995......................  $  31,362   $  31,362   $  62,724
  Contributions.............................................      1,509       1,509       3,018
  Distributions.............................................    (18,450)    (18,450)    (36,900)
  Net income................................................      5,570       5,570      11,140
                                                              ---------   ---------   ---------
Partners' capital at December 31, 1996......................     19,991      19,991      39,982
  Contributions.............................................        160         160         320
  Distributions.............................................     (9,650)     (9,650)    (19,300)
  Net income................................................      8,310       8,310      16,620
                                                              ---------   ---------   ---------
Partners' capital at December 31, 1997......................     18,811      18,811      37,622
  Distributions.............................................    (10,350)    (10,350)    (20,700)
  Net income................................................      9,113       9,113      18,226
                                                              ---------   ---------   ---------
Partners' capital at December 31, 1998......................     17,574      17,574      35,148
  Contributions (unaudited).................................     34,050      34,050      68,100
  Distributions (unaudited).................................     (6,350)     (6,350)    (12,700)
  Transfer ownership interest (unaudited) (Note 9)..........     48,151     (48,151)         --
  Capital contribution related to acquisition of 49%
     interest (unaudited) (Note 9)..........................     32,382          --      32,382
  Net income (unaudited)....................................      5,582       3,879       9,461
                                                              ---------   ---------   ---------
Partners' capital at June 30, 1999 (unaudited)..............  $ 131,389   $   1,002   $ 132,391
                                                              =========   =========   =========
</TABLE>


    The accompanying notes are an integral part of this financial statement.
                                      F-66
<PAGE>   214

                         VIOSCA KNOLL GATHERING COMPANY
                        (A DELAWARE GENERAL PARTNERSHIP)

                         NOTES TO FINANCIAL STATEMENTS

NOTE 1 -- ORGANIZATION:

     Viosca Knoll Gathering Company ("Viosca Knoll") is a Delaware general
partnership formed in May 1994 to design, construct, own and operate the Viosca
Knoll Gathering System (the "Viosca Knoll system") and any additional facilities
constructed or acquired pursuant to the Joint Venture Agreement between VK
Deepwater Gathering Company, L.L.C. ("VK Deepwater"), an approximate 99% owned
subsidiary of Leviathan Gas Pipeline Partners, L.P. ("Leviathan"), and EPEC
Deepwater Gathering Company ("EPEC Deepwater"), an indirect subsidiary of El
Paso Energy Corporation ("El Paso"). El Paso, as a result of its merger with
DeepTech International Inc. on August 14, 1998, owns an effective 27.3% interest
in Leviathan. Each of the partners has a 50% interest in Viosca Knoll. Viosca
Knoll is managed by a committee consisting of representatives from each of the
partners. Viosca Knoll has no employees. VK Deepwater is the operator of Viosca
Knoll and has contracted with an affiliate of EPEC Deepwater to maintain the
pipeline and with Leviathan to perform financial, accounting and administrative
services.

     The Viosca Knoll system is a non-jurisdictional gathering system designed
to serve the Main Pass, Mississippi Canyon and Viosca Knoll areas of the Gulf of
Mexico (the "Gulf"), southeast of New Orleans, offshore Louisiana. The Viosca
Knoll system, has a maximum design capacity of approximately 1 billion cubic
feet of natural gas per day and consists of 125 miles of predominantly 20-inch
natural gas pipelines and a large compressor. The Viosca Knoll system provides
its customers access to the facilities of a number of major interstate
pipelines, including Tennessee Gas Pipeline Company, Columbia Gulf Transmission
Company, Southern Natural Gas Company, Transcontinental Gas Pipe Line and Destin
Pipeline Company.

     The base system, comprised of (i) an approximately 94 mile, 20-inch
diameter pipeline from a platform in Main Pass Block 252 owned by Shell
Offshore, Inc. ("Shell") to a pipeline owned by Tennessee Gas Pipeline Company
at South Pass Block 55 and (ii) a six mile, 16-inch diameter pipeline from an
interconnection with the 20-inch diameter pipeline at Viosca Knoll Block 817 to
a pipeline owned by Southern Natural Gas Company at Main Pass Block 289, was
constructed in 1994. A 7,000 horsepower compressor was installed in 1996 on
Leviathan's Viosca Knoll 817 platform to allow Viosca Knoll to effect deliveries
at the operating pressures on downstream interstate pipelines with which it is
interconnected. The additional capacity created by such compression allowed
Viosca Knoll to transport new natural gas volumes during 1997 from the
Shell-operated Southeast Tahoe and Ram-Powell fields as well as other new
deepwater projects in the area. In 1997, Viosca Knoll added approximately 25
miles of parallel 20-inch pipelines.

NOTE 2 -- SIGNIFICANT ACCOUNTING POLICIES:

  Cash and cash equivalents

     All highly liquid investments with a maturity of three months or less when
purchased are considered to be cash equivalents.

  Property and equipment

     Gathering pipelines and related facilities are recorded at cost and
depreciated on a straight-line basis over an estimated useful life of 30 years.
Viosca Knoll also calculates a negative salvage provision using the
straight-line method based on an estimated cost of abandoning the pipeline of
$2.5 million. Other property, plant and equipment is depreciated on a
straight-line basis over an estimated useful life of five years. Maintenance and
repair costs are expensed as incurred; additions, improvements and replacements

                                      F-67
<PAGE>   215
                         VIOSCA KNOLL GATHERING COMPANY
                        (A DELAWARE GENERAL PARTNERSHIP)

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)

are capitalized. Retirements, sales and disposals of assets are recorded by
eliminating the related costs and accumulated depreciation of the disposed
assets with any resulting gain or loss reflected in income.

     Viosca Knoll evaluates impairment of its property and equipment in
accordance with Statement of Financial Accounting Standard ("SFAS") No. 121,
"Accounting for the Impairment of Long-Lived Assets and for Long-Lived Assets to
be Disposed Of" which requires recognition of impairment losses on long-lived
assets if the carrying amount of such assets, grouped at the lowest level for
which there are identifiable cash flows that are largely independent of the cash
flows from other assets, exceeds the estimated undiscounted future cash flows of
such assets. Measurement of any impairment loss will be based on the fair value
of the assets.

  Capitalization of interest

     Interest and other financing costs are capitalized in connection with
construction activities as part of the cost of the asset and amortized over the
related asset's estimated useful life.

  Debt issue costs

     Debt issue costs are capitalized and amortized over the life of the related
indebtedness. Any unamortized debt issue costs are expensed at the time the
related indebtedness is repaid or otherwise terminated.

  Revenue recognition

     Revenue from pipeline transportation of natural gas is recognized upon
receipt of the natural gas into the pipeline system. Revenue from demand charges
is recognized in the period the services are provided. Revenue from oil and
natural gas sales is recognized upon delivery in the period of production.

  Income taxes

     Viosca Knoll is not a taxable entity. Income taxes are the responsibility
of the partners and are not reflected in these financial statements. However,
the taxable income or loss resulting from the operations of Viosca Knoll will
ultimately be included in the federal income tax returns of the partners and may
vary substantially from income or loss reported for financial statement
purposes.

  Estimates

     The preparation of Viosca Knoll's financial statements in conformity with
generally accepted accounting principles requires management to make estimates
and assumptions, including those related to potential environmental liabilities
and future regulatory status, that affect the reported amounts of assets and
liabilities, disclosures of contingent assets and liabilities at the date of the
financial statements and the reported amounts of revenues and expenses during
the reporting period. Actual results could differ from those estimates.
Management believes that the estimates are reasonable.

  Recent Pronouncements

     In April 1998, the American Institute of Certified Public Accountants
issued SOP 98-5, "Reporting on the Costs of Start-Up Activities." This statement
defines start-up activities, requires start-up and organization costs to be
expensed as incurred and requires that any such costs that exist on the balance
sheet be expensed upon adoption of this pronouncement. The statement is
effective for fiscal years beginning after December 15, 1998. Viosca Knoll
adopted the provisions of this statement on January 1, 1999 resulting in no
material impact on its financial position or results of operations.
                                      F-68
<PAGE>   216
                         VIOSCA KNOLL GATHERING COMPANY
                        (A DELAWARE GENERAL PARTNERSHIP)

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)


     In June 1998, the Financial Accounting Standards Board issued SFAS No. 133,
as amended by SFAS No. 137, "Accounting for Derivative Instruments and Hedging
Activities," to be effective for all fiscal years beginning after June 15, 2000.
SFAS No. 133, as amended, requires that entities recognize all derivative
instruments as either assets or liabilities on the balance sheet and measure
those instruments at fair value. The accounting for changes in the fair value of
a derivative will depend on the intended use of the derivative and the resulting
designation. Viosca Knoll is currently evaluating the impact, if any, of SFAS
No. 133, as amended.


NOTE 3 -- INDEBTEDNESS:


     In December 1996, Viosca Knoll entered into a revolving credit facility
(the "Viosca Knoll Credit Facility") with a syndicate of commercial banks to
provide up to $100 million for the addition of compression and expansion to the
Viosca Knoll System and for other working capital needs of Viosca Knoll,
including providing a one time distribution not to exceed $25 million to its
partners (Note 7). Viosca Knoll's ability to borrow money under the facility is
subject to certain customary terms and conditions, including borrowing base
limitations. The Viosca Knoll Credit Facility is collateralized by all of Viosca
Knoll's material contracts and agreements, receivables and inventory and matures
on December 20, 2001. As of December 31, 1998 and 1997, Viosca Knoll had
$66,700,000 and $52,200,000, respectively, outstanding under the Viosca Knoll
Credit Facility bearing interest at an average floating rate of 6.7% per annum.
As of December 31, 1998, approximately $33,300,000 of additional funds were
available under the Viosca Knoll Credit Facility. See Note 8.



     Interest and other financing costs totaled $1,973,000 (unaudited),
$4,278,000, $2,710,000 and $90,000 for the six months ended June 30, 1999 and
for the years ended December 31, 1998, 1997 and 1996, respectively. During the
six months ended June 30, 1999 and the years ended December 31, 1998 and 1997,
Viosca Knoll capitalized $0 (unaudited), $11,000 and $751,000, respectively, of
such costs in connection with construction projects in progress.


NOTE 4 -- RELATED PARTY TRANSACTIONS:

     Pursuant to a management agreement dated May 24, 1994 between Viosca Knoll
and Leviathan, Leviathan charges Viosca Knoll a base fee of $100,000 annually in
exchange for Leviathan providing financial, accounting and administrative
services on behalf of Viosca Knoll. For each of the years ended December 31,
1998, 1997 and 1996, Leviathan charged Viosca Knoll $100,000 in accordance with
this management agreement.

     Viosca Knoll and EPEC Gas Services Company ("EPEC Gas"), an affiliate of
EPEC Deepwater, entered into a construction and operation agreement whereby EPEC
Gas provided personnel to manage the construction and operation of the Viosca
Knoll System in exchange for a one-time management fee of $3,000,000 and
provides routine maintenance services on behalf of Viosca Knoll. For the years
ended December 31, 1998, 1997 and 1996, EPEC Gas charged Viosca Knoll $415,000,
$216,000 and $200,000, respectively, with respect to its operating and
maintenance services.

     In addition, EPEC Gas and VK-Main Pass Gathering Company, L.L.C. ("VK Main
Pass"), a subsidiary of Leviathan, acquired and installed a compressor on the
Viosca Knoll 817 Platform, which is owned by Leviathan. The compressor was
placed in service in January 1997. For the years ended December 31, 1998, 1997
and 1996, Viosca Knoll reimbursed EPEC Gas $1,762,000, $1,282,000 and
$8,072,000, respectively, for construction related costs. For the years ended
December 31, 1998, 1997 and 1996, Viosca Knoll reimbursed VK Main Pass $152,000,
$47,000 and $254,000, respectively, for construction related items.

                                      F-69
<PAGE>   217
                         VIOSCA KNOLL GATHERING COMPANY
                        (A DELAWARE GENERAL PARTNERSHIP)

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)

     Included in transportation services revenue during the years ended December
31, 1998, 1997 and 1996 is $1,881,000, $3,921,000 and $3,229,000, respectively,
of revenue earned from transportation services provided to Flextrend Development
Company, L.L.C., a subsidiary of Leviathan. Included in operating expenses for
the years ended December 31, 1998, 1997 and 1996 is $2,447,000, $2,116,000 and
$249,000, respectively, of platform access fees and related expenses charged to
Viosca Knoll by VK Main Pass.

NOTE 5 -- COMMITMENTS AND CONTINGENCIES:

     In the ordinary course of business, Viosca Knoll is subject to various laws
and regulations. In the opinion of management, compliance with existing laws and
regulations will not materially affect the financial position or operations of
Viosca Knoll.

     The Viosca Knoll system is a gathering facility and as such is not
currently subject to rate and certificate regulation by the Federal Energy
Regulatory Commission (the "FERC"). However, the FERC has asserted that it has
rate jurisdiction under the Natural Gas Act of 1938, as amended (the "NGA"),
over gathering services performed through gathering facilities owned by a
natural gas company (as defined in the NGA) when such services were performed
"in connection with" transportation services provided by such natural gas
company. Whether, and to what extent, the FERC should exercise any NGA rate
jurisdiction it may be found to have over gathering facilities owned either by
natural gas companies or affiliates thereof is subject to case-by-case review by
the FERC. Based on current FERC policy and precedent, Viosca Knoll does not
anticipate that the FERC will assert or exercise any NGA rate jurisdiction over
the Viosca Knoll system so long as the services provided through such system are
not performed "in connection with" transportation services performed through any
of the regulated pipelines of either of the partners.

NOTE 6 -- MAJOR CUSTOMERS:

     Transportation revenue from major customers was as follows:

<TABLE>
<CAPTION>
                                                        YEAR ENDED DECEMBER 31,
                                             ---------------------------------------------
                                                 1998            1997            1996
                                             -------------   -------------   -------------
                                             AMOUNT     %    AMOUNT     %    AMOUNT     %
                                             -------   ---   -------   ---   -------   ---
<S>                                          <C>       <C>   <C>       <C>   <C>       <C>
Shell Offshore, Inc........................  $10,836    38   $11,198    48   $ 5,141    37
Snyder Oil Corporation.....................    4,801    17     3,653    16     3,275    24
Exxon Corporation..........................    3,354    12       498     2        --    --
Amoco Production Company...................    3,292    11       475     2        --    --
Flextrend Development Company, L.L.C. .....    1,881     7     3,921    17     3,229    23
Other......................................    4,642    15     3,383    15     2,278    16
                                             -------   ---   -------   ---   -------   ---
                                             $28,806   100   $23,128   100   $13,923   100
                                             =======   ===   =======   ===   =======   ===
</TABLE>

NOTE 7 -- CASH DISTRIBUTIONS:


     In March 1995, Viosca Knoll began making monthly distributions of 100% of
its Available Cash, as defined in the Joint Venture Agreement, to the partners.
Available Cash consists generally of all the cash receipts of Viosca Knoll less
all of its cash disbursements less reasonable reserves, including, without
limitation, those necessary for working capital and near-term commitments and
obligations or other contingencies of Viosca Knoll. Viosca Knoll expects to make
distributions of Available Cash within 15 days after the end of each month to
its partners. During the six months ended June 30, 1999 and the years ended
December 31, 1998, 1997 and 1996, Viosca Knoll paid distributions of $12,700,000
(unaudited), $20,700,000, $19,300,000 and $36,900,000, respectively, to its
partners. The distributions paid during 1996 include $25 million of funds
provided from borrowings under the Viosca Knoll Credit Facility. The Viosca
Knoll Credit Facility Agreement includes a covenant by which distributions are
limited to the


                                      F-70
<PAGE>   218
                         VIOSCA KNOLL GATHERING COMPANY
                        (A DELAWARE GENERAL PARTNERSHIP)

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)


greater of net income or 90% of earnings before interest and depreciation as
defined in the agreement. See Note 8.



NOTE 8 -- RECENT EVENTS:


     In January 1999, EPEC Deepwater announced the sale of (a) all of its
interest in Viosca Knoll, other than a 1% interest in profits and capital in
Viosca Knoll, to VK Deepwater for approximately $85.26 million (subject to
adjustment), comprised of 25% cash (up to a maximum of $21.315 million) and 75%
common units of Leviathan (up to a maximum of 3,205,263 common units), the
actual number of which will depend on the average closing price of the common
units during the applicable trading reference period, and (b) an option to
acquire the remaining 1% interest in the profits and capital in Viosca Knoll.

     Prior to closing, Viosca Knoll must obtain consent from its lenders under
the Viosca Knoll Credit Facility and Leviathan must obtain consent from its
lenders as well. At such time, either or both of such credit facilities may be
restructured.

     At the closing, which is anticipated to be during the second quarter of
1999, (i) EPEC Deepwater will contribute to Viosca Knoll an amount of money
equal to 50% of the amount then outstanding under the Viosca Knoll Credit
Facility (currently a total of $66.7 million is outstanding) and (ii) VK
Deepwater, through Leviathan, will pay El Paso and EPEC Deepwater the cash and
common units discussed above. Then, during the six month period commencing on
the day after the first anniversary of that closing date, VK Deepwater would
have the option to acquire the remaining 1% in profits and capital in Viosca
Knoll for a cash payment equal to the sum of $1.74 million plus the amount of
additional distributions which would have been paid, accrued or been in arrears
had VK Deepwater acquired the remaining 1% of Viosca Knoll at the initial
closing by issuing additional common units of Leviathan in lieu of a cash
payment of $1.74 million.


NOTE 9 -- CONSUMMATION OF VIOSCA KNOLL TRANSACTIONS (UNAUDITED)



     On June 1, 1999, VK Deepwater and EPEC Deepwater consummated the Viosca
Knoll transactions (See Note 8). In connection therewith, (i) EPEC Deepwater
contributed to Viosca Knoll $33.4 million, and (ii) EPEC Deepwater transferred a
49% interest in Viosca Knoll to VK Deepwater in exchange for a cash payment of
approximately $19.9 million and the issuance of 2,661,870 common units of
Leviathan valued at $59.8 million. The excess of VK Deepwater's cost over the
underlying book value of Viosca Knoll's net assets at June 1, 1999
(approximately $32.3 million) has been pushed down to the financial statements
of Viosca Knoll as an adjustment to property and equipment and partners'
capital. Accordingly, the financial statements as of and for the six months
ended June 30, 1999 are not comparable with prior periods.


                                      F-71
<PAGE>   219

INDEPENDENT AUDITORS' REPORT

To the Management Committee
High Island Offshore System, L.L.C.
Detroit, Michigan

     We have audited the accompanying statements of financial position of High
Island Offshore System, L.L.C. as of December 31, 1998 and 1997, and the related
statements of income, members' equity, and cash flows for each of the three
years in the period ended December 31, 1998. These financial statements are the
responsibility of the High Island Offshore System, L.L.C.'s management. Our
responsibility is to express an opinion on these financial statements based on
our audits.

     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

     In our opinion, such financial statements present fairly, in all material
respects, the financial position of High Island Offshore System, L.L.C. as of
December 31, 1998 and 1997, and the results of its operations and its cash flows
for each of the three years in the period ended December 31, 1998 in conformity
with generally accepted accounting principles.

DELOITTE & TOUCHE LLP

Detroit, Michigan
February 19, 1999

                                      F-72
<PAGE>   220

                      HIGH ISLAND OFFSHORE SYSTEM, L.L.C.


                        STATEMENTS OF FINANCIAL POSITION



<TABLE>
<CAPTION>
                                                                         AS OF DECEMBER 31,
                                                         AS OF       ---------------------------
                                                     JUNE 30, 1999       1998           1997
                                                     -------------   ------------   ------------
                                                      (UNAUDITED)
<S>                                                  <C>             <C>            <C>
                      ASSETS
Current assets:
  Cash and cash equivalents........................  $  1,272,342    $    868,312   $    876,845
  Accounts receivable..............................     5,872,504       3,777,590      4,709,918
  Prepayments......................................       234,151          15,948             --
                                                     ------------    ------------   ------------
          Total current assets.....................     7,378,997       4,661,850      5,586,763
                                                     ------------    ------------   ------------

Gas transmission plant.............................   373,121,843     372,370,180    371,321,033
  Less -- accumulated depreciation.................   366,923,035     364,601,970    359,830,332
                                                     ------------    ------------   ------------
          Net gas transmission plant...............     6,198,808       7,768,210     11,490,701
                                                     ------------    ------------   ------------

Deferred charges...................................     4,205,497       5,168,277        590,189
                                                     ------------    ------------   ------------

          Total assets.............................  $ 17,783,302    $ 17,598,337   $ 17,667,653
                                                     ============    ============   ============

          LIABILITIES AND MEMBERS' EQUITY

Current liabilities:
  Accounts payable.................................  $  4,763,200    $  2,424,849   $  3,077,779
  Unamortized rate reductions for excess deferred
     federal income taxes..........................        50,337         201,347        302,021
                                                     ------------    ------------   ------------
          Total current liabilities................     4,813,537       2,626,196      3,379,800
                                                     ------------    ------------   ------------

Noncurrent liabilities
  Unamortized rate reductions for excess deferred
     federal income taxes..........................            --              --        198,510
                                                     ------------    ------------   ------------

Commitments and contingencies (Note 6).............            --              --             --
                                                     ------------    ------------   ------------

Members' equity....................................    12,969,765      14,972,141     14,089,343
                                                     ------------    ------------   ------------

          Total liabilities and members' equity....  $ 17,783,302    $ 17,598,337   $ 17,667,653
                                                     ============    ============   ============
</TABLE>


                     See notes to the financial statements.
                                      F-73
<PAGE>   221

                      HIGH ISLAND OFFSHORE SYSTEM, L.L.C.


             STATEMENTS OF INCOME AND STATEMENTS OF MEMBERS' EQUITY



<TABLE>
<CAPTION>
                              SIX MONTHS ENDED JUNE 30,             YEAR ENDED DECEMBER 31,
                             ---------------------------   ------------------------------------------
                                 1999           1998           1998           1997           1996
                             ------------   ------------   ------------   ------------   ------------
                                     (UNAUDITED)
<S>                          <C>            <C>            <C>            <C>            <C>
STATEMENTS OF INCOME
Operating revenues:
  Transportation
     services..............  $ 19,279,440   $ 21,667,940   $ 43,477,250   $ 45,414,839   $ 47,052,978
  Other....................       188,209        196,280        340,323        502,111        387,764
                             ------------   ------------   ------------   ------------   ------------
          Total operating
            revenues.......    19,467,649     21,864,220     43,817,573     45,916,950     47,440,742
                             ------------   ------------   ------------   ------------   ------------
Operating expenses:
  Operation and
     maintenance...........     8,540,105      8,521,170     18,935,495     16,975,738     15,548,824
  Depreciation.............     2,321,066      2,384,078      4,771,638      4,773,588      4,775,405
  Property taxes...........       108,854        111,105        111,105        125,368        133,662
                             ------------   ------------   ------------   ------------   ------------
          Total operating
            expenses.......    10,970,025     11,016,353     23,818,238     21,874,694     20,457,891
                             ------------   ------------   ------------   ------------   ------------

          Net operating
            income.........     8,497,624     10,847,867     19,999,335     24,042,256     26,982,851
                             ------------   ------------   ------------   ------------   ------------

Other income and
  deductions...............            --             --        (16,537)            --         96,624
                             ------------   ------------   ------------   ------------   ------------
          Total other
            income and
            deductions.....            --             --        (16,537)            --         96,624
                             ------------   ------------   ------------   ------------   ------------

Net income.................  $  8,497,624   $ 10,847,867   $ 19,982,798   $ 24,042,256   $ 27,079,475
                             ============   ============   ============   ============   ============

STATEMENTS OF MEMBERS'
  EQUITY
Balance at beginning of
  period...................  $ 14,972,141   $ 14,089,343   $ 14,089,343   $ 20,547,087   $ 21,967,612
  Net income...............     8,497,624     10,847,867     19,982,798     24,042,256     27,079,475
  Capital contributions....            --             --      4,000,000             --             --
  Distributions to
     members...............   (10,500,000)   (13,100,000)   (23,100,000)   (30,500,000)   (28,500,000)
                             ------------   ------------   ------------   ------------   ------------
Balance at end of period...  $ 12,969,765   $ 11,837,210   $ 14,972,141   $ 14,089,343   $ 20,547,087
                             ============   ============   ============   ============   ============
</TABLE>


                     See notes to the financial statements.
                                      F-74
<PAGE>   222

                      HIGH ISLAND OFFSHORE SYSTEM, L.L.C.

                            STATEMENTS OF CASH FLOWS


<TABLE>
<CAPTION>
                             SIX MONTHS ENDED JUNE 30,             YEARS ENDED DECEMBER 31,
                            ---------------------------   ------------------------------------------
                                1999           1998           1998           1997           1996
                            ------------   ------------   ------------   ------------   ------------
                                    (UNAUDITED)
<S>                         <C>            <C>            <C>            <C>            <C>
Cash flows from operating
  activities:
  Net income..............  $  8,497,624   $ 10,847,867   $ 19,982,798   $ 24,042,256   $ 27,079,475
  Adjustments to reconcile
     net income to cash
     provided by operating
     activities
       Depreciation.......     2,321,066      2,384,078      4,771,638      4,773,588      4,775,405
       Accounts
          receivable......    (2,094,914)       948,775        932,328          7,260       (353,633)
       Prepayments........      (218,203)            --        (15,948)       211,842         91,444
       Deferred charges
          and other.......       811,770        242,547     (4,877,271)      (145,294)        67,173
       Provision for
          regulatory
          matters.........            --             --             --             --     (1,050,623)
       Accounts payable...     2,753,441       (643,394)      (335,434)        23,821     (1,515,481)
                            ------------   ------------   ------------   ------------   ------------
          Cash provided by
            operating
            activities....    12,070,784     13,779,873     20,458,111     28,913,473     29,093,760
                            ------------   ------------   ------------   ------------   ------------

Cash flows from investing
  activities:
  Capital expenditures....    (1,166,754)       (20,478)    (1,366,644)      (822,554)      (209,863)
                            ------------   ------------   ------------   ------------   ------------
          Cash used in
            investing
            activities....    (1,166,754)       (20,478)    (1,366,644)      (822,554)      (209,863)
                            ------------   ------------   ------------   ------------   ------------

Cash flows from financing
  activities:
  Capital contributions...            --             --      4,000,000             --             --
  Distributions to
     members..............   (10,500,000)   (13,100,000)   (23,100,000)   (30,500,000)   (28,500,000)
                            ------------   ------------   ------------   ------------   ------------
          Cash used in
            financing
            activities....   (10,500,000)   (13,100,000)   (19,100,000)   (30,500,000)   (28,500,000)
                            ------------   ------------   ------------   ------------   ------------

Increase (decrease) in
  cash and cash
  equivalents.............       404,030        659,395         (8,533)    (2,409,081)       383,897
Cash and cash equivalents
  at beginning of
  period..................       868,312        876,845        876,845      3,285,926      2,902,029
                            ------------   ------------   ------------   ------------   ------------

Cash and cash equivalents
  at end of period........  $  1,272,342   $  1,536,240   $    868,312   $    876,845   $  3,285,926
                            ============   ============   ============   ============   ============
</TABLE>


                     See notes to the financial statements.

                                      F-75
<PAGE>   223

                      HIGH ISLAND OFFSHORE SYSTEM, L.L.C.

                       NOTES TO THE FINANCIAL STATEMENTS
                  YEARS ENDED DECEMBER 31, 1998, 1997 AND 1996

NOTE 1 -- FORMATION AND OWNERSHIP STRUCTURE

  Description and Business Purpose


     Effective December 10, 1998, High Island Offshore System, ("HIOS" or the
"Company"), a Delaware partnership, was converted to a Delaware Limited
Liability Corporation ("L.L.C."). In January 1999, the members of HIOS, each of
which owned a 20% interest, contributed their capital accounts to Western Gulf
Holdings, L.L.C. ("Western Gulf") in exchange for an equivalent ownership
interest in Western Gulf. As a result, Western Gulf now owns a 100% interest in
the Company. Western Gulf was formed to invest in the development of a 85 mile
pipeline which will connect to HIOS and extend to the deep water "Diana"
prospect containing an estimated 1 trillion cubic feet of reserves. The new line
is scheduled to begin transporting gas in late 2000 and is projected to cost $90
million. The line will be owned by East Breaks Gathering Company, L.L.C., which
is also owned by Western Gulf.


     HIOS owns a 203.4 mile undersea gas transmission system in the Gulf of
Mexico which provides transportation services as authorized by the Federal
Energy Regulatory Commission ("FERC"). HIOS' major transportation customers
include natural gas marketers and producers, and interstate natural gas pipeline
companies. The Company extends credit for transportation services provided to
these customers. The concentrations of customers, described above, may affect
the Company's overall credit risk in that the customers may be similarly
affected by changes in economic, regulatory and other factors.

     HIOS is managed by a committee consisting of representatives from each of
the member companies. HIOS has no employees. ANR Pipeline Company ("ANR")
operates the system on behalf of HIOS under an agreement which provides that
services rendered to HIOS will be reimbursed at cost ($12.4 million for 1998,
$11.4 million for 1997, and $9.6 million for 1996).

NOTE 2 -- SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

  Basis of Presentation

     The Company is regulated by the FERC. In addition, the Company meets the
criteria and, accordingly, follows the accounting and reporting requirements of
Statement of Financial Accounting Standards No. 71 for regulated enterprises.

  Use of Estimates

     The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and the
reported amounts of revenues and expenses. Actual results could differ from
those estimates. Management believes that its estimates are reasonable.

  Depreciation

     Annual depreciation and negative salvage provisions are computed on a
straight-line basis using rates of depreciation which vary by type of property.
The annual composite depreciation rates were approximately 1.29% for 1998, 1997,
and 1996 which include a provision for negative salvage of .2% for offshore
facilities.

  Income Taxes

     For tax filing purposes, the Company has elected partnership status, and
therefore, income taxes are the responsibility of the Members and are not
reflected in the financial statements of the Company.

                                      F-76
<PAGE>   224
                      HIGH ISLAND OFFSHORE SYSTEM, L.L.C.

                NOTES TO THE FINANCIAL STATEMENTS -- (CONTINUED)

  Statement of Cash Flows

     For purposes of these financial statements, the Company considers
short-term investments purchased with an original maturity of three months or
less to be cash equivalents. The Company had short-term investments in the
amount of $.9 million at December 31, 1998 and 1997. The Company made no cash
payments for interest in 1998, 1997, or 1996.

  Accounting Pronouncements


     The Financial Accounting Standards Board has issued FAS 133, as amended by
FAS 137, "Accounting for Derivative Instruments and Hedging Activities," to be
effective for all fiscal years beginning after June 15, 2000. FAS 133, as
amended requires that an entity recognize all derivatives as either assets or
liabilities in the statement of financial position and measure those instruments
at fair value. The accounting for changes in the fair value of a derivative will
depend on the intended use of the derivative and the resulting designation. The
Company is currently evaluating the impact, if any, of FAS 133, as amended.


NOTE 3 -- REGULATORY MATTERS

     By letter order issued September 18, 1995, the FERC approved the settlement
of the Company's rate filing at Docket No. RP94-162, which required that the
Company file a new rate case within three years. On October 8, 1998, the FERC
granted a request filed by the Company for an extension of time for the filing
of its next general rate case until January 1, 2003. Costs incurred in
connection with the extension of the rate case settlement have been deferred and
are being amortized on a straight-line basis through the period ending December
31, 2002.

NOTE 4 -- FAIR VALUE OF FINANCIAL INSTRUMENTS

     The carrying value of cash invested on a temporary basis at short-term
market rates of interest approximates the fair market value of the investments.

NOTE 5 -- RELATED PARTY TRANSACTIONS

     Transportation revenues derived from affiliated pipeline companies were $.8
million for 1998, $6.2 million for 1997, and $16.7 million for 1996. The Company
had no accounts receivable balances due from these affiliates for transportation
services at December 31, 1998 and 1997.

     Both ANR and U-T Offshore System ("UTOS") provide separation, dehydration
and measurement services to HIOS. UTOS is equally owned by affiliates of ANR,
Natural Gas Pipeline Company of America, and Leviathan Gas Pipeline Partners,
L.P. HIOS incurred charges for these services of $2.5 million in 1998, $2.5
million in 1997, and $2.8 million in 1996 from ANR and $2.0 million in 1998,
$1.7 million in 1997, and $1.4 million in 1996 from UTOS.

     In February 1996, the Company reached an agreement with ANR, which was
approved by the FERC, which provides that rates charged by ANR would be $2.8
million for calendar year 1996, $2.5 million per year for calendar years 1997,
1998 and 1999 and $2.2 million for calendar year 2000. The rate would be
negotiated for calendar year 2001 and thereafter.

     Amounts due to ANR were $1.9 million and $1.8 million at December 31, 1998
and 1997, respectively, and amounts due to UTOS were $.2 million and $.1 million
at December 31, 1998 and 1997, respectively.

NOTE 6 -- COMMITMENTS AND CONTINGENCIES

     In the ordinary course of business, the Company is subject to various laws
and regulations. In the opinion of management, compliance with existing laws and
regulations will not materially affect the financial position or the results of
operations of the Company.

                                      F-77
<PAGE>   225
                      HIGH ISLAND OFFSHORE SYSTEM, L.L.C.

                NOTES TO THE FINANCIAL STATEMENTS -- (CONTINUED)

NOTE 7 -- LEGAL PROCEEDINGS


     In 1996, Jack Grynberg filed a claim under the False Claims Act on behalf
of the U.S. government in the U.S. District Court, District of Columbia, against
70 defendants, including the Company. The suit sought damages for the alleged
underpayment of royalties due to the purported improper measurement of gas. The
1996 suit was dismissed without prejudice in March 1997 and the dismissal was
affirmed by the D.C. Court of Appeals in October 1998. In September 1997, Mr.
Grynberg filed 77 separate, similar False Claims Act suits against natural gas
transmission companies and producers, gatherers, and processors of natural gas,
seeking unspecified damages. The Company has been included in two of the
September 1997 suits. The suits were filed in the U.S. District Court, District
of Colorado and the U.S. District Court, Eastern District of Michigan. In April
1999, the United States Department of Justice notified the Company that the
United States will not intervene in these cases (unaudited).


     Although no assurances can be given and no determination can be made at
this time as to the outcome of any particular lawsuit or proceeding, the Company
believes there are meritorious defenses to substantially all such claims and
that any liability which may be finally determined should not have a material
adverse effect on the Company's financial position or results of operations.

                                      F-78
<PAGE>   226

                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS

To the Members of
Poseidon Oil Pipeline Company, L.L.C.:

     We have audited the accompanying balance sheets of Poseidon Oil Pipeline
Company, L.L.C. (a Delaware limited liability company), as of December 31, 1998
and 1997, and the related statements of income, members' equity and cash flows
for the years ended December 31, 1998 and 1997, and for the period from
inception (February 14, 1996) through December 31, 1996. These financial
statements are the responsibility of the Company's management. Our
responsibility is to express an opinion on these financial statements based on
our audits.

     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

     In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of Poseidon Oil Pipeline
Company, L.L.C., as of December 31, 1998 and 1997, and the results of its
operations and its cash flows for the years ended December 31, 1998 and 1997,
and for the period from inception (February 14, 1996) through December 31, 1996,
in conformity with generally accepted accounting principles.

                                            ARTHUR ANDERSEN LLP

Houston, Texas
March 18, 1999

                                      F-79
<PAGE>   227

                     POSEIDON OIL PIPELINE COMPANY, L.L.C.

                                 BALANCE SHEETS
                           DECEMBER 31, 1998 AND 1997

<TABLE>
<CAPTION>
                                                                  1998           1997
                                                              ------------   ------------
<S>                                                           <C>            <C>
                           ASSETS
Current assets:
  Cash and cash equivalents.................................  $    685,540   $  1,671,451
  Crude oil receivables --
     Related parties........................................    28,216,308     21,729,130
     Other..................................................    12,179,468      7,316,566
  Construction advances to operator (Note 6)................     1,234,467             --
  Materials, supplies and other.............................     1,022,450      1,045,937
                                                              ------------   ------------
          Total current assets..............................    43,338,233     31,763,084
Debt reserve fund (Notes 2 and 4)...........................     4,329,254      3,717,627
Property, plant and equipment, net of accumulated
  depreciation
  (Note 3)..................................................   228,752,910    222,337,758
                                                              ------------   ------------
          Total assets......................................  $276,420,397   $257,818,469
                                                              ============   ============

              LIABILITIES AND MEMBERS' EQUITY

Current liabilities:
  Accounts payable --
     Related parties........................................  $  4,945,839   $  2,602,133
     Other..................................................     2,165,159      5,516,554
  Crude oil payables --
     Related parties........................................    28,646,791     22,534,661
     Other..................................................     3,778,243      5,139,391
  Other.....................................................       597,590         70,922
                                                              ------------   ------------
          Total current liabilities.........................    40,133,622     35,863,661
                                                              ------------   ------------
Long-term debt (Note 4).....................................   131,000,000    120,500,000
                                                              ------------   ------------
Members' equity (Note 1):
  Capital contributions.....................................   107,999,320    107,999,320
  Capital distributions.....................................   (36,699,320)   (17,999,320)
  Retained earnings.........................................    33,986,775     11,454,808
                                                              ------------   ------------
          Total members' equity.............................   105,286,775    101,454,808
                                                              ------------   ------------
          Total liabilities and members' equity.............  $276,420,397   $257,818,469
                                                              ============   ============
</TABLE>

   The accompanying notes are an integral part of these financial statements.
                                      F-80
<PAGE>   228

                     POSEIDON OIL PIPELINE COMPANY, L.L.C.

                              STATEMENTS OF INCOME
                 FOR THE YEARS ENDED DECEMBER 31, 1998 AND 1997
             AND FOR THE PERIOD FROM INCEPTION (FEBRUARY 14, 1996)
                           THROUGH DECEMBER 31, 1996

<TABLE>
<CAPTION>
                                                      1998            1997            1996
                                                  -------------   -------------   -------------
<S>                                               <C>             <C>             <C>
Crude oil sales.................................  $ 370,431,640   $ 310,828,794   $ 176,849,075
Crude oil purchases.............................   (325,909,477)   (284,667,502)   (169,030,526)
                                                  -------------   -------------   -------------
          Net sales revenue.....................     44,522,163      26,161,292       7,818,549
                                                  -------------   -------------   -------------
Operating costs:
  Transportation costs..........................      1,636,162       3,146,736         858,229
  Operating expenses............................      3,127,134       2,635,717       2,183,375
  Depreciation..................................      8,846,395       6,463,327       2,176,157
                                                  -------------   -------------   -------------
          Total operating costs.................     13,609,691      12,245,780       5,217,761
                                                  -------------   -------------   -------------

Operating income................................     30,912,472      13,915,512       2,600,788
Other income (expense):
  Interest income...............................        290,745         208,961         339,452
  Interest expense..............................     (8,671,250)     (5,340,742)       (269,163)
                                                  -------------   -------------   -------------
Net income......................................  $  22,531,967   $   8,783,731   $   2,671,077
                                                  =============   =============   =============
</TABLE>

   The accompanying notes are an integral part of these financial statements.
                                      F-81
<PAGE>   229

                     POSEIDON OIL PIPELINE COMPANY, L.L.C.

                         STATEMENTS OF MEMBERS' EQUITY
                 FOR THE YEARS ENDED DECEMBER 31, 1998 AND 1997
             AND FOR THE PERIOD FROM INCEPTION (FEBRUARY 14, 1996)
                           THROUGH DECEMBER 31, 1996

<TABLE>
<CAPTION>
                                                     POSEIDON
                                       MARATHON      PIPELINE            TEXACO
                                          OIL        COMPANY,         TRADING AND
                                        COMPANY       L.L.C.      TRANSPORTATION, INC.
                                         (28%)         (36%)             (36%)              TOTAL
                                      -----------   -----------   --------------------   ------------
<S>                                   <C>           <C>           <C>                    <C>
Balance, February 14, 1996..........  $        --   $        --       $         --       $         --
  Cash contributions................    5,200,000            --         36,399,660         41,599,660
  Property contributions............   20,000,000    36,399,660         10,000,000         66,399,660
  Cash distributions................           --    (3,999,660)       (13,999,660)       (17,999,320)
  Net income........................      747,901       961,588            961,588          2,671,077
                                      -----------   -----------       ------------       ------------
Balance, December 31, 1996..........   25,947,901    33,361,588         33,361,588         92,671,077
  Net income........................    2,459,445     3,162,143          3,162,143          8,783,731
                                      -----------   -----------       ------------       ------------
Balance, December 31, 1997..........   28,407,346    36,523,731         36,523,731        101,454,808
  Net income........................    6,308,951     8,111,508          8,111,508         22,531,967
  Cash distributions................   (5,236,000)   (6,732,000)        (6,732,000)       (18,700,000)
                                      -----------   -----------       ------------       ------------
Balance, December 31, 1998..........  $29,480,297   $37,903,239       $ 37,903,239       $105,286,775
                                      ===========   ===========       ============       ============
</TABLE>

   The accompanying notes are an integral part of these financial statements.
                                      F-82
<PAGE>   230

                     POSEIDON OIL PIPELINE COMPANY, L.L.C.

                            STATEMENTS OF CASH FLOWS
                 FOR THE YEARS ENDED DECEMBER 31, 1998 AND 1997
             AND FOR THE PERIOD FROM INCEPTION (FEBRUARY 14, 1996)
                           THROUGH DECEMBER 31, 1996

<TABLE>
<CAPTION>
                                                        1998           1997           1996
                                                     -----------   ------------   -------------
<S>                                                  <C>           <C>            <C>
Cash flows from operating activities:
  Net income.......................................  $22,531,967   $  8,783,731   $   2,671,077
  Adjustments to reconcile net income to net cash
   provided by operating activities --
     Depreciation..................................    8,846,395      6,463,327       2,176,157
     Changes in operating assets and liabilities --
       Crude oil receivables.......................  (11,350,080)     2,509,382     (31,555,078)
       Materials, supplies and other...............       23,487       (952,294)        (93,643)
       Accounts payable............................   (1,007,689)     5,939,637       2,179,050
       Crude oil payables..........................    4,750,982     (8,098,087)     35,772,139
       Other current liabilities...................      526,668        (16,110)         87,032
                                                     -----------   ------------   -------------
          Net cash provided by operating
            activities.............................   24,321,730     14,629,586      11,236,734
                                                     -----------   ------------   -------------
Cash flows from investing activities:
  Capital expenditures.............................  (15,261,547)   (54,024,948)   (110,698,884)
  Construction advances to operator, net...........   (1,234,467)     7,407,710      (7,407,710)
  Proceeds from the sale of property, plant and
     equipment.....................................           --        146,250              --
                                                     -----------   ------------   -------------
          Net cash used in investing activities....  (16,496,014)   (46,470,988)   (118,106,594)
                                                     -----------   ------------   -------------
Cash flows from financing activities:
  Proceeds from issuance of debt...................   32,000,000     38,000,000     107,000,000
  Cash contributions...............................           --             --      41,599,660
  Repayments of long-term debt.....................  (21,500,000)    (1,500,000)    (23,000,000)
  Cash distributions...............................  (18,700,000)            --     (17,999,320)
  Increase in debt reserve fund....................     (611,627)    (3,717,627)             --
                                                     -----------   ------------   -------------
          Net cash provided by financing
            activities.............................   (8,811,627)    32,782,373     107,600,340
                                                     -----------   ------------   -------------
Increase in cash and cash equivalents..............     (985,911)       940,971         730,480
Cash and cash equivalents, beginning of year.......    1,671,451        730,480              --
                                                     -----------   ------------   -------------
Cash and cash equivalents, end of year.............  $   685,540   $  1,671,451   $     730,480
                                                     ===========   ============   =============
Supplemental disclosure of cash flow information:
  Cash paid for interest, net of amounts
     capitalized...................................  $ 8,596,583   $  5,342,217   $     205,713
                                                     ===========   ============   =============
Supplemental disclosure of noncash financing
  activities:
  Initial Poseidon property contribution...........  $        --   $         --   $  36,399,660
                                                     ===========   ============   =============
  Block 873 Pipeline property contribution.........  $        --   $         --   $  30,000,000
                                                     ===========   ============   =============
</TABLE>

   The accompanying notes are an integral part of these financial statements.
                                      F-83
<PAGE>   231

                     POSEIDON OIL PIPELINE COMPANY, L.L.C.

                         NOTES TO FINANCIAL STATEMENTS
                           DECEMBER 31, 1998 AND 1997

NOTE 1 -- ORGANIZATION AND NATURE OF BUSINESS

     Poseidon Oil Pipeline Company, L.L.C. (the Company), is a Delaware limited
liability company formed on February 14, 1996, to design, construct, own and
operate the unregulated Poseidon Pipeline extending from the Gulf of Mexico to
onshore Louisiana. The original members of the Company were Texaco Trading and
Transportation, Inc. (TTTI), and Poseidon Pipeline Company, L.L.C. (Poseidon), a
subsidiary of Leviathan Gas Pipeline Partners, L.P. TTTI contributed $36,399,660
in cash, and Poseidon contributed property, plant and equipment, valued by the
two parties (TTTI and Poseidon) at $36,399,660, at the formation of the Company.
Each member received a 50 percent ownership interest in the Company.
Subsequently, $2,799,320 in cash was equally distributed to TTTI and Poseidon,
leaving $70 million of equity in the Company as of April 23, 1996.

     On July 1, 1996, Marathon Pipeline Company (MPLC) and Texaco Pipeline, Inc.
(TPLI), through their 66 2/3 percent and 33 1/3 percent respectively owned
venture, Block 873 Pipeline Company (Block 873), contributed property, plant and
equipment valued by the parties (Block 873, TTTI and Poseidon) at $30,000,000.
In return, they received a 33 1/3 percent interest in the Company. Immediately
after the contribution, MPLC and TPLI transferred their pro rata ownership
interests in the Company to Marathon Oil Company (Marathon) and TTTI,
respectively. Marathon then contributed an additional $5.2 million in cash, and
distributions of $12.6 million and $2.6 million in cash were made to TTTI and
Poseidon, respectively. Upon completion of this transaction, TTTI, Poseidon and
Marathon owned 36 percent, 36 percent and 28 percent of the Company,
respectively, and total equity was $90,000,000.

     The Company purchased crude oil line-fill and began operating Phase I of
the pipeline in April 1996. Phase I consists of 16-inch and 20-inch sections of
pipe extending from the Garden Banks Block 72 to Ship Shoal Block 332. Phase II
of the pipeline is a 24-inch section of pipe from Ship Shoal Block 332 to
Caillou Island. Line-fill was purchased for Phase II in late December 1996 and
operations began in January 1997. Construction of Phase III of the pipeline
consisting of a section of 24-inch line extending from Caillou Island to the
Houma, Louisiana, area was completed during 1997, and operations began in
December 1997.

     The Company is in the business of transporting crude oil in the Gulf of
Mexico in accordance with various purchase and sale contracts with producers
served by the pipeline. The Company buys crude oil at various points along the
pipeline and resells the crude oil at a destination point in accordance with
each individual contract. Net sales revenue is earned based upon the
differential between the sale price and purchase price. Differences between
purchased and sold volumes in any period are recorded as changes in line-fill.

     Effective January 1, 1998, Shell Oil Company and Texaco Inc. (Texaco)
formed Equilon Enterprises LLC (Equilon). Equilon is a joint venture which
combines both companies' western and midwestern U.S. refining and marketing
businesses and both companies' nationwide trading, transportation and lubricants
businesses. Under the formation agreement, Shell Oil Company and Texaco
assigned, or caused to be assigned, the economic benefits and detriments of
certain regulated and unregulated pipeline assets, including TTTI's beneficial
interest in the Company. As a result of the joint venture, Equilon became
operator of the Company on January 1, 1998.

NOTE 2 -- SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

  Basis of Accounting

     The accompanying financial statements have been prepared on the accrual
basis of accounting in accordance with generally accepted accounting principles.

                                      F-84
<PAGE>   232
                     POSEIDON OIL PIPELINE COMPANY, L.L.C.

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)

  Use of Estimates

     The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting period. Actual results could differ from those estimates.

  Property, Plant and Equipment

     Contributed property, plant and equipment is recorded at fair value as
agreed to by the members at the date of contribution. Acquired property, plant
and equipment is recorded at cost. Pipeline equipment is depreciated using a
composite, straight-line method over estimated useful lives of three to 30
years. Line-fill is not depreciated as management of the Company believes the
cost of all barrels is fully recoverable. Major renewals and betterments are
capitalized in the property accounts while maintenance and repairs are expensed
as incurred. No gain or loss is recognized on normal asset retirements under the
composite method.

  Cash and Cash Equivalents

     The Company considers all highly liquid investments purchased with an
original maturity of three months or less to be cash equivalents.

  Debt Reserve Fund

     In connection with the Company's revolving credit facility (see Note 4),
the Company is required to maintain a debt reserve account as security on the
outstanding balance. At December 31, 1998, the balance in the account totaled
$4,329,254 and was comprised of funds earning interest at a money market rate.

  Fair Value of Financial Instruments

     The Company's financial instruments consist of cash and cash equivalents,
short-term receivables, payables and long-term debt. The carrying values of cash
and cash equivalents, short-term receivables and payables approximate fair
value. The fair value for long-term debt is estimated based on current rates
available for similar debt with similar maturities and securities and, at
December 31, 1998, approximates the carrying value.

                                      F-85
<PAGE>   233
                     POSEIDON OIL PIPELINE COMPANY, L.L.C.

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)

NOTE 3 -- PROPERTY, PLANT AND EQUIPMENT

     Property, plant and equipment consisted of the following at December 31,
1998 and 1997:

<TABLE>
<CAPTION>
                                                               1998           1997
                                                           ------------   ------------
<S>                                                        <C>            <C>
Rights-of-way............................................  $  3,218,788   $  3,218,788
Line-fill................................................    11,350,466     11,160,410
Line pipe, line pipe fittings and pipeline
  construction...........................................   223,076,191    206,041,256
Pumping and station equipment............................     4,613,516      4,584,563
Office furniture, vehicles and other equipment...........        83,812         67,609
Construction work in progress............................     3,896,016      5,904,616
                                                           ------------   ------------
                                                            246,238,789    230,977,242
Less -- Accumulated depreciation.........................   (17,485,879)    (8,639,484)
                                                           ------------   ------------
                                                           $228,752,910   $222,337,758
                                                           ============   ============
</TABLE>

     Management evaluates the carrying value of the pipeline in accordance with
the guidelines presented under Statement of Financial Accounting Standards
(SFAS) No. 121, "Accounting for the Impairment of Long-Lived Assets and for
Long-Lived Assets to Be Disposed Of." SFAS No. 121 establishes standards for
measuring the impairment of long-lived assets to be held and used and of those
to be disposed. Management believes no impairment of assets exists as of
December 31, 1998.

     During 1998 and 1997, the Company capitalized approximately $-- and
$2,151,000, respectively, of interest cost into property, plant and equipment.

NOTE 4 -- DEBT

     The Company maintains a $150,000,000 revolving credit facility with a group
of banks. The outstanding balance at December 31, 1998, is $131,000,000. Under
the terms of the related credit agreement, the Company has the option to either
draw or renew amounts at various maturities ranging from one to 12 months if a
Eurodollar interest rate arrangement is selected (6.875 percent to 6.9375
percent at December 31, 1998). These borrowings can then be renewed assuming no
event of default exists. Alternatively, the Company may select to borrow under a
base interest rate arrangement, calculated in accordance with the credit
agreement. The revolving credit facility matures on April 30, 2001.

     At December 31, 1998, the entire outstanding balance had been borrowed
under the Eurodollar alternative, and it is the Company's intent to extend
repayment beyond one year, thus the entire balance has been classified as
long-term.

     The debt is secured by various assets of the Company including accounts
receivable, inventory, pipeline equipment and investments. The Company has used
the funds drawn on the revolver primarily for construction costs associated with
Phases II and III of the pipeline.

     The revolving credit agreement requires the Company to meet certain
financial and nonfinancial covenants. The Company must maintain a tangible net
worth, calculated in accordance with the credit agreement, of not less than
$80,000,000. Beginning April 1, 1997, the Company is required to maintain a
ratio of earnings before interest, taxes, depreciation and amortization to
interest paid or accrued, as calculated in accordance with the credit agreement,
of 2.50 to 1.00. In addition, the Company is required to maintain a debt reserve
fund (see Note 2) with a balance equal to two times the interest payments made
in the previous quarter under the credit facility.

                                      F-86
<PAGE>   234
                     POSEIDON OIL PIPELINE COMPANY, L.L.C.

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)

NOTE 5 -- INCOME TAXES

     A provision for income taxes has not been recorded in the accompanying
financial statements because such taxes accrue directly to the members. The
federal and state income tax returns of the Company are prepared and filed by
the operator.

NOTE 6 -- TRANSACTIONS WITH RELATED PARTIES

     The Company derives a significant portion of its gross sales and gross
purchases from its members and other related parties. The Company generated
approximately $263,872,000 in gross affiliated sales and approximately
$226,184,000 in gross affiliated purchases for 1998. During 1997 and 1996, the
Company generated approximately $19,790,000 and $4,086,000 of net sales revenue
from related parties.

     The Company paid approximately $558,000 to Equilon in 1998 and $454,000 and
$401,000 to TTTI in 1997 and 1996, respectively, for management, administrative
and general overhead. In 1998, 1997 and 1996, the Company paid construction
management fees of $2,133,507, $1,091,000 and $2,364,000, respectively, to
Equilon in connection with the completion of Phase II and Phase III. As of
December 31, 1998 and 1997, the Company had outstanding advances to Equilon of
approximately $1,234,000 and $--, respectively, in connection with construction
work in progress.

NOTE 7 -- CONTINGENCIES

     In the normal course of business, the Company is involved in various legal
actions arising from its operations. In the opinion of management, the outcome
of these legal actions will not significantly affect the financial position or
results of operations of the Company.

                                      F-87
<PAGE>   235

                       REPORT OF INDEPENDENT ACCOUNTANTS

To the Board of Directors and Members
  of Neptune Pipeline Company, L.L.C.

     In our opinion, the accompanying consolidated balance sheet and the related
consolidated statements of income, of members' capital and of cash flows present
fairly, in all material respects, the financial position of Neptune Pipeline
Company, L.L.C. at December 31, 1998 and 1997, and the result of its operations
and its cash flows for the years then ended, in conformity with generally
accepted accounting principles. These financial statements are the
responsibility of the Company's management; our responsibility is to express an
opinion on these financial statements based on our audits. We conducted our
audits of these statements in accordance with generally accepted auditing
standards which require that we plan and perform the audit to obtain reasonable
assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements, assessing the
accounting principles used and significant estimates made by management, and
evaluating the overall financial statement presentation. We believe that our
audits provide a reasonable basis for the opinion expressed above.

                                            PricewaterhouseCoopers LLP

Houston, Texas
March 11, 1999

                                      F-88
<PAGE>   236

                        NEPTUNE PIPELINE COMPANY, L.L.C.

                           CONSOLIDATED BALANCE SHEET
                        AS OF DECEMBER 31, 1998 AND 1997

<TABLE>
<CAPTION>
                                                                  1998           1997
                                                              ------------   ------------
<S>                                                           <C>            <C>
                           ASSETS
Current assets:
  Cash and cash equivalents.................................  $  6,016,841   $ 18,531,456
  Transportation receivable.................................     1,279,405        764,008
  Owing from related parties................................     2,880,664     11,974,091
  Other receivable..........................................       104,756         89,821
                                                              ------------   ------------
          Total current assets..............................    10,281,666     31,359,376

Pipelines and equipment.....................................   261,104,113    249,861,312
  Less: accumulated depreciation............................    12,204,577      2,056,246
                                                              ------------   ------------
                                                               248,899,536    247,805,066

Long-term receivable........................................       160,000             --
                                                              ------------   ------------
          Total assets......................................  $259,341,202   $279,164,442
                                                              ============   ============

              LIABILITIES AND MEMBERS' EQUITY

Current liabilities:
  Accounts payable..........................................  $    964,761   $  2,001,863
  Owing to related parties..................................     4,784,102     32,779,237
  Deferred income...........................................            --         20,478
                                                              ------------   ------------
          Total current liabilities.........................     5,748,863     34,801,578

Minority interest...........................................     1,872,959      1,778,740

Members' equity.............................................   251,719,380    242,584,124
                                                              ------------   ------------
          Total liabilities and members' equity.............  $259,341,202   $279,164,442
                                                              ============   ============
</TABLE>

        The accompanying notes are an integral part of these statements.
                                      F-89
<PAGE>   237

                        NEPTUNE PIPELINE COMPANY, L.L.C.

                        CONSOLIDATED STATEMENT OF INCOME
                 FOR THE YEARS ENDED DECEMBER 31, 1998 AND 1997

<TABLE>
<CAPTION>
                                                                 1998          1997
                                                              -----------   ----------
<S>                                                           <C>           <C>
Operating income:
  Transportation revenue....................................  $16,172,659   $6,317,728
  Other gas revenue.........................................      180,236           --
                                                              -----------   ----------
          Total revenues....................................   16,352,895    6,317,728

Operating expenses:
  Operating & maintenance...................................    3,575,712    1,693,978
  Administrative & general..................................    1,455,240      992,520
  Depreciation..............................................   10,148,332    2,056,246
  Property taxes............................................      326,332           --
                                                              -----------   ----------
          Total operating expenses..........................   15,505,616    4,742,744

Net operating income........................................      847,279    1,574,984

  Other income (expense)
     Other expense..........................................     (150,100)          --
     Interest income........................................      385,123      362,142
     Allowance for funds used during construction...........           --    6,430,641
                                                              -----------   ----------
          Total other income, net...........................      235,023    6,792,783

Net income before minority interest.........................    1,082,302    8,367,767

  Minority interest in income of subsidiaries...............       11,026       81,736
                                                              -----------   ----------
Net income..................................................  $ 1,071,276   $8,286,031
                                                              ===========   ==========
</TABLE>

        The accompanying notes are an integral part of these statements.
                                      F-90
<PAGE>   238

                        NEPTUNE PIPELINE COMPANY, L.L.C.

                      CONSOLIDATED STATEMENT OF CASH FLOWS
                 FOR THE YEARS ENDED DECEMBER 31, 1998 AND 1997

<TABLE>
<CAPTION>
                                                                  1998           1997
                                                              ------------   -------------
<S>                                                           <C>            <C>
Cash flows from operating activities:
  Net income................................................  $  1,071,276   $   8,286,031
  Adjustments to reconcile net income to net cash provided
   by (used for) operating activities:
     Depreciation...........................................    10,148,332       2,056,246
     Allowance for funds used during construction...........            --      (6,430,641)
     Minority interest in income of subsidiaries............        11,026          81,736
  (Increases) decreases in working capital:
     Transportation receivables.............................      (515,397)       (764,008)
     Owing from related parties.............................     9,093,427     (11,974,091)
     Other receivable.......................................        25,065         (89,503)
     Accounts payable.......................................    (1,037,102)      2,001,863
     Owing to related parties...............................   (30,791,136)     32,779,237
     Deferred income........................................       (20,478)        (54,522)
                                                              ------------   -------------
          Net cash provided by (used for) operating
            activities......................................   (12,014,987)     25,892,348
                                                              ------------   -------------

Cash flows used for investing activities:
  Capital expenditures......................................    (9,252,950)   (179,087,955)
  Proceeds from property sales and salvage..................       187,149              --
  Contributions in aid of construction......................       419,000              --
                                                              ------------   -------------
          Net cash used for investing activities............    (8,646,801)   (179,087,955)
                                                              ------------   -------------

Cash flows provided by financing activities:
  Members' contributed capital..............................    13,985,491     172,512,990
  Minority interest contributed capital.....................        83,193       1,696,980
  Distributions.............................................    (5,921,511)     (2,560,000)
                                                              ------------   -------------
          Net cash provided by financing activities.........     8,147,173     171,649,970
                                                              ------------   -------------

Increase (decrease) in cash and cash equivalents............  $(12,514,615)  $  18,454,363
                                                              ============   =============

Reconciliation of beginning and ending balances
  Cash and cash equivalents -- beginning of year............  $ 18,531,456   $      77,093
  Increase (decrease) in cash and cash equivalents..........   (12,514,615)     18,454,363
                                                              ------------   -------------
Cash and cash equivalents -- end of year....................  $  6,016,841   $  18,531,456
                                                              ============   =============
</TABLE>

        The accompanying notes are an integral part of these statements.
                                      F-91
<PAGE>   239

                        NEPTUNE PIPELINE COMPANY, L.L.C.

                         STATEMENT OF MEMBERS' CAPITAL
                        AS OF DECEMBER 31, 1998 AND 1997

<TABLE>
<CAPTION>
                                        TEJAS OFFSHORE
                                        PIPELINE LLC/    MARATHON GAS    SAILFISH
                                        SHELL SEAHORSE   TRANSMISSION    PIPELINE
                                           COMPANY           INC.       COMPANY LLC      TOTAL
                                        --------------   ------------   -----------   ------------
<S>                                     <C>              <C>            <C>           <C>
Capital account balances at December
  31, 1996............................   $      1,194    $       581    $      612    $      2,387
Members' contributions................    115,473,693     56,659,297       380,000     172,512,990
Contributed assets....................      4,100,000             --    60,242,716      64,342,716
Net income............................      3,433,401      1,328,264     3,524,366       8,286,031
Distributions.........................             --             --    (2,560,000)     (2,560,000)
                                         ------------    -----------    -----------   ------------
Capital account balances at December
  31, 1997............................    123,008,288     57,988,142    61,587,694     242,584,124
Members' contributions................      5,369,182      3,524,321     5,091,988      13,985,491
Net income............................        585,317        236,169       249,790       1,071,276
Distributions.........................     (3,358,512)    (1,246,864)   (1,316,135)     (5,921,511)
                                         ------------    -----------    -----------   ------------
Capital account balances at December
  31, 1998............................   $125,604,275    $60,501,768    $65,613,337   $251,719,380
                                         ============    ===========    ===========   ============
</TABLE>

        The accompanying notes are an integral part of these statements.
                                      F-92
<PAGE>   240

                        NEPTUNE PIPELINE COMPANY, L.L.C.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                               DECEMBER 31, 1998

NOTE 1 -- ORGANIZATION AND CONTROL

     Neptune Pipeline Company, L.L.C. (Neptune) owns a 99% member interest in
Manta Ray Offshore Gathering Company, L.L.C. (Manta Ray) and Nautilus Pipeline
Company, L.L.C. (Nautilus). Neptune is owned as follows: Tejas Offshore
Pipeline, LLC (Tejas), an affiliate of Shell Oil Company owns a 49.9% member
interest; Shell Seahorse Company (Shell Seahorse), an affiliate of Shell Oil
Company owns a 0.1% member interest; Marathon Gas Transmission Inc. (Marathon)
owns a 24.33% member interest; Sailfish Pipeline Company, L.L.C. (Sailfish) owns
a 25.67% member interest.

     Tejas acquired its 49.9% interest from Shell Seahorse on February 2, 1998.

     Agreements between the member companies address the allocation of income
and capital contributions and distributions amongst the respective members'
capital accounts. As a result of these agreements, the ratio of members' equity
accounts per the Statement of Members' Capital differs from the members'
ownership interests in Neptune.

     Neptune was formed to acquire, construct, own and operate through Manta Ray
and Nautilus, the Manta Ray System and the Nautilus System and any other natural
gas pipeline systems approved by the members. As of December 31, 1998 the Manta
Ray System and the Nautilus System are the only pipelines owned by Manta Ray and
Nautilus, respectively.

     The formation of Manta Ray was accomplished through cash and fixed asset
contributions from the member companies. Fixed asset contributions, which
accounted for approximately 50% of all contributions, consisted of the Manta Ray
System and various compressor equipment (contributed by Sailfish) and the
Boxer-Bullwinkle System (contributed by Shell Seahorse). Because both cash and
fixed assets were contributed, the Manta Ray System and related compressor
equipment and the Boxer-Bullwinkle System were recorded at $64,342,716, which
represented their fair value on the date of contribution.

     The Manta Ray System consists of a 169 mile gathering system located in the
South Timbalier and Ship Shoal areas of the Gulf of Mexico. An additional
segment, 47 miles of 24 inch pipeline and associated facilities, extending from
Green Canyon Block 65, offshore Louisiana, to Ship Shoal Block 207, offshore
Louisiana, was constructed during 1997 and first provided natural gas
transportation service on December 15, 1997. This newly constructed pipeline is
referred to as Phase II Facilities elsewhere in these notes.

     The Nautilus System consists of a 30-inch natural gas pipeline and
appurtenant facilities extending approximately 101 miles from Ship Shoal Block
207, offshore Louisiana, to six delivery point interconnects near the outlet of
Exxon Company, U.S.A.'s Garden City Gas Processing Plant in St. Mary Parish,
Louisiana. The Nautilus System was constructed during 1997 and first provided
natural gas transportation service on December 15, 1997.

     Neptune, Manta Ray and Nautilus (collectively referred to as the Companies)
have no employees and receive all administrative and operating support through
contractual arrangements with affiliated companies. These services and
agreements are outlined in Note 3, Related Party Transactions.

NOTE 2 -- SIGNIFICANT ACCOUNTING POLICIES

  Principles of Consolidation

     The consolidated financial statements include the accounts of Neptune and
its subsidiaries. All intercompany transactions and balances have been
eliminated in consolidation.

                                      F-93
<PAGE>   241
                        NEPTUNE PIPELINE COMPANY, L.L.C.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

  Regulation

     Nautilus, as an interstate pipeline, is subject to regulation by the
Federal Energy Regulatory Commission (FERC). Nautilus has accounting policies
that conform to generally accepted accounting principles, as applied to
regulated enterprises and are in accordance with the accounting requirements and
ratemaking practices of the FERC.

  Cash and Cash Equivalents

     All highly liquid investments with a maturity of three months or less when
purchased are considered to be cash equivalents.

  Pipelines and Equipment

     Newly constructed pipelines are recorded at historical cost. Regulated
pipelines and equipment includes an Allowance for Funds Used During Construction
(AFUDC). The rates used in the calculation of AFUDC are determined in accordance
with guidelines established by FERC. The Manta Ray pipeline and related
facilities are depreciated on a straight-line basis over their estimated useful
life of 30 years, while the Nautilus pipeline and related facilities are
depreciated on a straight line basis over their estimated useful life of 20
years. Maintenance and repair costs are expensed as incurred while additions,
improvements and replacements are capitalized.

  Income Taxes

     Neptune is treated as a tax partnership under the provisions of the
Internal Revenue Code. Accordingly, the accompanying financial statements do not
reflect a provision for income taxes since Neptune's results of operations and
related credits and deductions will be passed through to and taken into account
by its partners in computing their respective tax liabilities.

  Impairment of Long-Lived Assets

     Statement of Financial Accounting Standard (SFAS) No. 121, "Accounting for
the Impairment of Long-Lived Assets and for Long-Lived Assets to Be Disposed Of"
requires recognition of impairment losses on long-lived assets if the carrying
amount of such assets, grouped at the lowest level for which there are
identifiable cash flows that are largely independent of the cash flows from
other assets, exceeds the estimated undiscounted future cash flows of such
assets. Measurement of any impairment loss is based on the fair value of the
asset. At December 31, 1998 and 1997, there were no impairments.

  Revenue Recognition

     Revenue from Manta Ray's and Nautilus' transportation of natural gas is
recognized upon receipt of natural gas into the pipeline systems.

     In the course of providing transportation services to customers, Nautilus
and Manta Ray may receive different quantities of gas from shippers than the
quantities delivered on behalf of those shippers. These transactions result in
imbalances which are settled in cash on a monthly basis. In addition, certain
imbalances may occur with interconnecting facilities when the Companies deliver
more or less than what is nominated (scheduled). The settlement of these
imbalances is governed by Operational Balancing Agreements (OBA). Certain OBAs
stipulate that settlement will occur through delivery of physical quantities in
subsequent months. The Companies record the net of all imbalances as
Transportation Revenue or Other Revenue and carry the net position as a payable
or a receivable, as appropriate.

                                      F-94
<PAGE>   242
                        NEPTUNE PIPELINE COMPANY, L.L.C.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

  Fair Value of Financial Instruments

     The reported amounts of financial instruments such as cash and cash
equivalents, receivables, and current liabilities approximate fair value because
of their maturities.

  Use of Estimates and Significant Risks

     The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of certain assets and liabilities,
the disclosure of contingent assets and liabilities at the date of the financial
statements and the related reported amounts of revenue and expenses during the
reporting period. Such estimates and assumptions include those made in areas of
FERC regulations, fair value of financial instruments, future cash flows
associated with assets, useful lives for depreciation and potential
environmental liabilities. Actual results could differ from those estimates.
Management believes that the estimates are reasonable.

     Development and production of natural gas in the service area of the
pipelines are subject to, among other factors, prices for natural gas and
federal and state energy policy, none of which are within the Companies'
control.

  Reclassification

     Certain prior period amounts in the financial statements and notes thereto
have been reclassified to conform with the current year presentation.

NOTE 3 -- RELATED PARTY TRANSACTIONS

  Construction Management Agreements

     On January 17, 1997, Nautilus entered into a Construction Management
Agreement (the Agreement) with Marathon under which Marathon agreed to construct
the Nautilus System. As of December 31, 1998 and 1997 respectively, Nautilus had
incurred $113,127,385, and $113,041,314 of costs under the Agreement. Of these
amounts, $309,238 and $2,665,922 were recorded as liabilities to affiliates at
December 31, 1998 and 1997, respectively.

     On January 17, 1997, Manta Ray entered into a Construction Management
Agreement with Shell Seahorse under which Shell Seahorse agreed to construct the
Phase II Facilities. Also on January 17, 1997, Manta Ray entered into a
Construction Management Agreement with Marathon under which Marathon agreed to
construct a slug catcher. On August 1, 1998, Manta Ray entered into a
Construction Management Agreement with Marathon under which Marathon agreed to
construct condensate stabilization facilities. As of December 31, 1998 and 1997,
Manta Ray had incurred $83,388,913 and $64,016,789, respectively, under these
agreements. Of these amounts, $4,236,507 and $7,875,533 were recorded as
liabilities to affiliates at December 31, 1998 and 1997, respectively.

  Transportation Services

     During 1998, $3,881,667 of transportation revenues for Nautilus were
derived from related parties. During 1997, Nautilus derived substantially all of
its transportation revenue from transportation services provided under
agreements with Shell Offshore Incorporated (SOI) and Marathon Oil Company, both
of which are affiliates of Nautilus. All transactions were at rates pursuant to
the existing tariff. At December 31, 1998 and 1997 respectively, Nautilus had
affiliate receivables of $596,090 and $0 relating to transportation and gas
imbalances. At December 31, 1998 and 1997, respectively, Nautilus had affiliate
payables of $230,730 and $0 relating to transportation and gas imbalances.

                                      F-95
<PAGE>   243
                        NEPTUNE PIPELINE COMPANY, L.L.C.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

     In 1998, $4,902,613 of transportation revenues on Manta Ray were derived
from related parties. During 1997, Manta Ray derived substantially all of its
transportation revenue from transportation services provided under agreements
with third parties. All transactions were at negotiated rates. At December 31,
1998 and 1997 respectively, Manta Ray had receivables of $1,857,320 and $639,208
relating to transportation and gas imbalances.

     At December 31, 1998, Manta Ray also had a receivable from Sailfish of
$297,348 relating to accumulated transportation and gas balancing activity
associated with the assets contributed by Sailfish.

  Leases

     Effective December 1, 1997, Manta Ray, as lessor, and Nautilus, as lessee,
entered into a lease agreement for usage of offshore platform space located at
Ship Shoal Block 207. The term of the lease is for the life of the platform,
subject to certain early termination conditions, and requires minimum lease
payments of $225,000 per year adjusted annually for inflation. The associated
lease revenue and expense have been eliminated in consolidation.

  Operating and Administrative Expense

     Since the Companies have no employees, operating, maintenance and general
and administrative services are provided to the Companies under service
agreements with Manta Ray Gathering Company, L.L.C., Marathon, and Shell
Seahorse, all of which are affiliates of the Companies. Substantially all
operating and administrative expenses were incurred through services provided
under these agreements.

  Other Affiliate Transactions

     During 1997, Manta Ray and Nautilus had various transactions relating to
construction with member companies or affiliates which resulted in affiliate
receivables of $11,337,218 and affiliate payables of $22,237,782.

     Also included in Owing from Related Parties at December 31, 1998 is a
receivable from an affiliate for $129,698 relating to the sale of land during
the fourth quarter of 1998 by Nautilus. No gain or loss was recognized on the
sale.

NOTE 4 -- PIPELINES AND EQUIPMENT

     Pipelines and equipment at December 31, 1998 and 1997 is comprised of the
following (in thousands):

<TABLE>
<CAPTION>
                                                                1998       1997
                                                              --------   --------
<S>                                                           <C>        <C>
Pipelines and equipment.....................................  $244,835   $242,194
Land........................................................     1,107      1,237
AFUDC.......................................................     6,430      6,430
Construction in progress....................................     8,732         --
                                                              --------   --------
          Subtotal..........................................   261,104    249,861
Accumulated depreciation....................................    12,204      2,056
                                                              --------   --------
          Total.............................................  $248,900   $247,805
                                                              ========   ========
</TABLE>

     At December 31, 1997, included in pipelines and equipment is an accrued
estimate of costs incurred to date of $3,022,000. Actual costs incurred during
1998 relating to this accrual totaled $1,855,000. Pipelines and Equipment and
Owing to Related Parties have been adjusted in 1998.

                                      F-96
<PAGE>   244
                        NEPTUNE PIPELINE COMPANY, L.L.C.

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)

     During 1998, Nautilus entered into interconnection agreements with certain
other parties in which Nautilus agreed to construct interconnection facilities
whereby the parties agreed to contribute $619,000 as partial reimbursement for
construction costs. Nautilus was reimbursed $419,000 during 1998 and the
remaining balance will be paid monthly based on throughput. The receivable
balance at December 31, 1998 was $200,000, the current portion of which is
$40,000.

NOTE 5 -- REGULATORY MATTERS

     The FERC has jurisdiction over the Nautilus System with respect to
transportation of gas, rates and charges, construction of new facilities,
extension or abandonment of service facilities, accounts and records,
depreciation and amortization policies and certain other matters.

NOTE 6 -- COMMITMENTS AND CONTINGENCIES

     In the ordinary course of business, the Companies are subject to various
laws and regulations. In the opinion of management, compliance with existing
laws and regulations will not materially affect the financial position, the
results of operations or cash flows of the Companies.

     Various legal actions, which have arisen in the ordinary course of
business, are pending with respect to the assets of the Companies. Management
believes that the ultimate disposition of these actions, either individually or
in aggregate, will not have a material adverse effect on the financial position,
the results of operations or the cash flows of the Companies.

     Pursuant to the terms of a construction agreement entered into in 1995,
Manta Ray agreed to pay liquidated damages to various parties if Manta Ray did
not complete an interconnect by May 31, 1998 between the Manta Ray System and
the system operated by Trunkline Gas Pipeline Company. Under the provision,
Manta Ray incurred $150,000 in 1998, which is recorded in Other Expense. Manta
Ray will be obligated to pay an additional $100,000 if the interconnect is not
completed by May 31, 1999 and $50,000 if the interconnect is not completed by
May 31, 2000.

                                      F-97
<PAGE>   245

                       REPORT OF INDEPENDENT ACCOUNTANTS

To the Board of Directors and Stockholder of
  Leviathan Gas Pipeline Company

     In our opinion, the accompanying balance sheet presents fairly, in all
material respects, the financial position of Leviathan Gas Pipeline Company at
December 31, 1998 in conformity with generally accepted accounting principles.
This financial statement is the responsibility of the Company's management; our
responsibility is to express an opinion on this financial statement based on our
audit. We conducted our audit of this statement in accordance with generally
accepted auditing standards, which require that we plan and perform the audit to
obtain reasonable assurance about whether the financial statement is free of
material misstatement. An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statement, assessing the
accounting principles used and significant estimates made by management, and
evaluating the overall financial statement presentation. We believe that our
audit provides a reasonable basis for the opinion expressed above.

                                            PricewaterhouseCoopers LLP

Houston, Texas
June 2, 1999

                                      F-98
<PAGE>   246

                         LEVIATHAN GAS PIPELINE COMPANY
             (AN INDIRECT SUBSIDIARY OF EL PASO ENERGY CORPORATION)

                                 BALANCE SHEET
                               DECEMBER 31, 1998
                       (In thousands, except share data)

<TABLE>
<S>                                                           <C>
                               ASSETS

Current assets:
  Cash and cash equivalents.................................  $ 6,409
  Accounts receivable from the Partnership (Note 5).........      406
  Other.....................................................       22
                                                              -------
          Total current assets..............................    6,837
  Equity investment.........................................   18,362
                                                              -------
          Total assets......................................  $25,199
                                                              =======

                LIABILITIES AND STOCKHOLDER'S EQUITY

Current liabilities:
  Payable to parent.........................................  $   652
  Intercompany taxes payable (Note 4).......................      693
                                                              -------
          Total current liabilities.........................    1,345
Deferred tax liability (Note 4).............................   23,154
                                                              -------
          Total liabilities.................................   24,499
                                                              -------
Commitments and contingencies
Stockholder's equity:
  Common stock, $0.10 par value, 1,000 shares authorized,
     issued and outstanding.................................        1
  Additional paid-in capital................................      100
  Accumulated earnings......................................      599
                                                              -------
                                                                  700
                                                              -------
          Total liabilities and stockholder's equity........  $25,199
                                                              =======
</TABLE>

    The accompanying notes are an integral part of this financial statement.
                                      F-99
<PAGE>   247

                         LEVIATHAN GAS PIPELINE COMPANY
             (AN INDIRECT SUBSIDIARY OF EL PASO ENERGY CORPORATION)

                             NOTES TO BALANCE SHEET

NOTE 1 -- ORGANIZATION:

     Leviathan Gas Pipeline Company ("Leviathan"), a Delaware corporation and
indirect wholly-owned subsidiary of El Paso Energy Corporation ("El Paso
Energy"), was formed in 1989 to purchase, operate and expand offshore natural
gas pipeline systems. El Paso Energy is a diversified energy holding company,
engaged, through it subsidiaries, in the interstate and intrastate
transportation, gathering and processing of natural gas; the marketing of
natural gas, power and other energy-related commodities; power generation; and
the development and operation of energy infrastructure facilities worldwide.

     In 1993, Leviathan contributed substantially all of its natural gas
pipeline operations, certain other assets and liabilities and related
acquisition debt to Leviathan Gas Pipeline Partners, L.P. and its subsidiaries
(collectively referred to as the "Partnership"), a publicly held Delaware master
limited partnership, in exchange for an effective 35.8% interest in the
Partnership. Leviathan's effective ownership interest in the Partnership was
reduced to 27.3% as a result of an additional public offering by the Partnership
in June 1994. The Partnership is primarily engaged in the gathering,
transportation and production of oil and natural gas in the Gulf of Mexico and
through its subsidiaries and joint ventures, owns interests in significant
assets, including (i) eight existing natural gas pipelines, (ii) a crude oil
pipeline system, (iii) six strategically-located multi-purpose platforms, (iv)
production handling and dehydration facilities, (v) four producing oil and
natural gas properties and (vi) a non-producing oil and natural gas property.
Leviathan, as general partner, performs all management and operating functions
of the Partnership. In August 1998, El Paso Energy paid approximately $422
million to acquire its interest in Leviathan through a merger with DeepTech
International Inc. ("DeepTech"), Leviathan's parent.

     At December 31, 1998, Preference Units and Common Units totaling 18,075,000
were owned by the public, representing a 72.7% effective limited partner
interest in the Partnership. Leviathan, through its ownership of a 25.3% limited
partner interest in the form of 6,291,894 Common Units, its 1% general partner
interest in the Partnership and its approximate 1% nonmanaging interest in
certain subsidiaries of the Partnership, owned a 27.3% effective interest in the
Partnership as of December 31, 1998.

NOTE 2 -- SIGNIFICANT ACCOUNTING POLICIES:

  Income taxes

     Income taxes are based on income reported for tax return purposes along
with a provision for deferred income taxes. Deferred income taxes are provided
to reflect the tax consequences in future years of differences between the
financial statement and tax bases of assets and liabilities at each year-end.
Tax credits are accounted for under the flow-through method, which reduces the
provision for income taxes in the year the tax credits first become available.
Deferred tax assets are reduced by a valuation allowance when, based upon
management's estimates, it is more likely than not that a portion of the
deferred tax assets will not be realized in the future period. The estimates
utilized in the recognition of deferred tax assets are subject to revision in
future periods based on new facts or circumstances.

     After August 14, 1998, as a result of El Paso Energy's acquisition of
DeepTech, Leviathan's results are included in the consolidated federal income
tax return of El Paso Energy. On behalf of itself and all members filing in its
consolidated federal income tax return, including Leviathan, El Paso Energy
adopted a tax sharing policy (the "Policy") which provides, among other things,
that (i) each company in a taxable income position will be currently charged
with an amount equivalent to its federal income tax computed on a separate
return basis and (ii) each company in a tax loss position will be reimbursed
currently to the extent its deductions, including general business credits, were
utilized in the consolidated tax return. Under the Policy, El Paso Energy will
pay all federal income taxes directly to the IRS and will bill or refund, as
applicable, its subsidiaries for their applicable portion of such income tax
payments.

                                      F-100
<PAGE>   248
                         LEVIATHAN GAS PIPELINE COMPANY
             (AN INDIRECT SUBSIDIARY OF EL PASO ENERGY CORPORATION)

                     NOTES TO BALANCE SHEET -- (CONTINUED)

  Estimates

     The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of certain assets and liabilities,
the disclosure of contingent assets and liabilities at the date of the financial
statements and the related reported amounts of revenue and expenses during the
reporting period. Actual results could differ from those estimates. Management
believes that the estimates used are reasonable.

  Recent Pronouncements

     Effective July 1, 1998, Leviathan adopted Statement of Financial Accounting
Standard ("SFAS") No. 129, "Disclosure of Information About Capital Structure"
which establishes standards for disclosing information about an entity's capital
structure previously not required by nonpublic entities. The adoption of this
pronouncement did not have a material impact on Leviathan's financial position
or results of operations.

     In June 1998, the Financial Accounting Standards Board issued SFAS No. 133,
"Accounting for Derivative Instruments and Hedging Activities". SFAS No. 133
requires that entities recognize all derivative investments as either assets or
liabilities on the balance sheet and measure those instruments at fair value.
Changes in the fair value of derivatives are recorded each period in current
earnings or other comprehensive income, depending on whether a derivative is
designated as part of a hedge transaction. For fair-value hedge transactions in
which Leviathan is hedging changes in an asset's, liability's or firm
commitment's fair value, changes in the fair value of the derivative instrument
will generally be offset in the income statement by changes in the hedged item's
fair value. For cash-flow hedge transactions, in which Leviathan is hedging the
variability of cash flows related to a variable-rate asset, liability, or a
forecasted transaction, changes in the fair value of the derivative instrument
will be reported in other comprehensive income. The gains and losses on the
derivative instrument that are reported in other comprehensive income will be
reclassified as earnings in the periods in which earnings are impacted by the
variability of the cash flows of the hedged item. The ineffective portion of all
hedges will be recognized in current-period earnings. This statement was amended
to be effective for fiscal years beginning after June 15, 2000. Leviathan has
not yet determined the impact that the adoption of SFAS No. 133 will have on its
financial position or results of operations.

NOTE 3 -- EQUITY INVESTMENT:

     Leviathan uses the equity method to account for its investment in the
Partnership. Additional income is allocated by the Partnership to Leviathan as a
result of the Partnership achieving certain target levels of cash distributions
to its unitholders. See discussion of incentive distributions below. The
summarized financial information for Leviathan's investment in the Partnership
is as follows:

                     LEVIATHAN GAS PIPELINE PARTNERS, L.P.
                            SUMMARIZED BALANCE SHEET
                               DECEMBER 31, 1998
                                 (IN THOUSANDS)

<TABLE>
<S>                                                            <C>
Current assets..............................................   $ 11,943
Noncurrent assets...........................................    430,783
Current liabilities.........................................     11,167
Notes payable...............................................    338,000
Other noncurrent liabilities................................     10,724
</TABLE>

                                      F-101
<PAGE>   249
                         LEVIATHAN GAS PIPELINE COMPANY
             (AN INDIRECT SUBSIDIARY OF EL PASO ENERGY CORPORATION)

                     NOTES TO BALANCE SHEET -- (CONTINUED)

     The Partnership distributes 100% of available cash, as defined in the
Partnership Agreement, on a quarterly basis to the unitholders of the
Partnership and to Leviathan, as general partner. During the Preference Period
(as defined in the Partnership Agreement), these distributions were effectively
made 98% to unitholders and 2% to Leviathan, subject to the payment of incentive
distributions to Leviathan if certain target levels of cash distributions to
unitholders are achieved. As an incentive, the general partner's interest in the
portion of quarterly cash distributions in excess of $0.325 per unit and less
than or equal to $0.375 per unit is increased to 15%. For quarterly cash
distributions over $0.375 per unit but less than or equal to $0.425 per unit,
the general partner receives 25% of such incremental amount and for all
quarterly cash distributions in excess of $0.425 per unit, the general partner
receives 50% of the incremental amount.

NOTE 4 -- INCOME TAXES:

     After August 14, 1998, Leviathan is included in the consolidated federal
income tax return filed by El Paso Energy. The Policy provides for the manner of
determining payments with respect to federal income tax liabilities (Note 2).

     Deferred federal income taxes are primarily attributable to the differences
in depreciation rates and in the timing of recognizing income from the
Partnership for financial and tax reporting purposes.

     Leviathan's deferred income tax liabilities (assets) at December 31, 1998
consisted of the following (in thousands):

<TABLE>
<S>                                                           <C>
Deferred tax liabilities:
  Investment in the Partnership.............................  $23,141
  Other.....................................................       13
                                                              -------
          Total deferred tax liability......................   23,154
                                                              -------
Deferred tax assets:
  Net operating loss ("NOL") carryforwards..................     (153)
  Alternative minimum tax ("AMT") credit carryforward.......   (1,719)
  Valuation allowance.......................................    1,872
                                                              -------
          Total deferred tax assets.........................       --
                                                              -------
Net deferred tax liability..................................  $23,154
                                                              =======
</TABLE>

     As of December 31, 1998, approximately $1,719,000 of AMT credit
carryforwards, which have no expiration date, were available to offset future
regular tax liabilities. Additionally, as of December 31, 1998, approximately
$438,000 of NOL carryforwards, which expire in 2017, were available to offset
future tax liabilities.

     Leviathan has recorded a valuation allowance (i) to reflect the estimated
amount of deferred tax assets that may not be realized due to the expiration of
NOL carryforwards and (ii) to reflect the uncertainty that the AMT credit
carryforwards will be utilized. Leviathan's NOL and AMT credit carryforwards are
subject to separate return limitation year restrictions.

     Current amounts due to El Paso Energy for the intercompany charge for
federal income taxes totaled $693,000 as of December 31, 1998.

NOTE 5 -- RELATED PARTY TRANSACTIONS:

     Leviathan, as general partner of the Partnership, is entitled to
reimbursement of all reasonable expenses incurred by it or its affiliates for or
on behalf of the Partnership including amounts payable by

                                      F-102
<PAGE>   250
                         LEVIATHAN GAS PIPELINE COMPANY
             (AN INDIRECT SUBSIDIARY OF EL PASO ENERGY CORPORATION)

                     NOTES TO BALANCE SHEET -- (CONTINUED)

Leviathan to El Paso Energy under a management agreement whereby El Paso Energy
provides operational, financial, accounting and administrative services to
Leviathan. The management agreement is intended to reimburse El Paso Energy for
the estimated costs of its services provided to Leviathan and the Partnership.

     In addition, the management agreement also requires a payment by Leviathan
to compensate El Paso Energy for certain tax liabilities resulting from, among
other things, additional taxable income allocated to Leviathan due to (i) the
issuance of additional Preference Units (including the sale of the Preference
Units by the Partnership pursuant to the public offering of additional
Preference Units) and (ii) the investment of such proceeds in additional
acquisitions or construction projects. The management agreement expires on June
30, 2002, and may thereafter be terminated on 90 days' notice by either party.

NOTE 6 -- COMMITMENTS AND CONTINGENCIES:

     In the ordinary course of business, Leviathan is subject to various laws
and regulations. In the opinion of management, compliance with existing laws and
regulations will not materially effect the financial position of Leviathan.
Various legal actions which have arisen in the ordinary course of business are
pending with respect to the assets of Leviathan. Management believes that the
ultimate disposition of these actions, either individually or in the aggregate,
will not have a material adverse effect on Leviathan's financial position.

                                      F-103
<PAGE>   251

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

                                      LOGO

                     LEVIATHAN GAS PIPELINE PARTNERS, L.P.
                         LEVIATHAN FINANCE CORPORATION

                                  $175,000,000

                       OFFER TO EXCHANGE ALL OUTSTANDING
              10 3/8% SERIES A SENIOR SUBORDINATED NOTES DUE 2009

                                      FOR

              10 3/8% SERIES B SENIOR SUBORDINATED NOTES DUE 2009

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

                                   PROSPECTUS
                   ------------------------------------------


                                AUGUST 27, 1999


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

     We have not authorized any dealer, sales person or other person to give you
written information other than this prospectus or to make representations as to
matters not stated in this prospectus. You must not rely on unauthorized
information. This prospectus is not an offer to sell the notes or our
solicitation of your offer to buy the notes in any jurisdiction where that would
not be permitted or legal. Neither the delivery of this prospectus nor any sales
made hereunder after the date of this prospectus shall create an implication
that the information contained herein or the affairs of the company have not
changed since the date of this prospectus.

- --------------------------------------------------------------------------------
<PAGE>   252

                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 20. INDEMNIFICATION OF DIRECTORS AND OFFICERS


     Our partnership agreement provides that we:



     - will indemnify our general partner, any Departing Partner and any person
       who is or was an officer, director or other representative of our general
       partner, any Departing Partner or us, to the fullest extent permitted by
       law, and



     - may indemnify, to the fullest extent permitted by law, (a) any person who
       is or was an affiliate of our general partner, any Departing Partner or
       us, (b) any person who is or was an employee, partner, agent or trustee
       of our general partner, any Departing Partner, us or any such affiliate,
       or (c) any person who is or was serving at our request as an officer,
       director, employee, partner, member, agent or other representative of
       another corporation, partnership, joint venture, trust, committee or
       other enterprise;



(each, as well as any employee, partner, agent or other representative of our
general partner, any Departing Partner, us or any of their affiliates, an
"Indemnitee") from and against any and all claims, damages, expenses and fines,
whether civil, criminal, administrative or investigative, in which any
Indemnitee may be involved, or is threatened to be involved, as a party or
otherwise, by reason of its status as (1) our general partner, Departing
Partner, us or an affiliate of either, (2) an officer, director, employee,
partner, agent, trustee or other representative of our general partner, any
Departing Partner, us or any of their affiliates or (3) a person serving at our
request in any other entity in a similar capacity. Indemnification will be
conditioned on the determination that, in each case, the Indemnitee acted in
good faith, in a manner which such Indemnitee believed to be in, or not opposed
to, our best interests and, with respect to any criminal proceeding, had no
reasonable cause to believe its conduct was unlawful.



     Subject to the terms, conditions and restrictions set forth in our
partnership agreement, Section 17-108 of the Delaware Revised Uniform Limited
Partnership Act empowers a Delaware limited partnership to indemnify and hold
harmless any partner or other person from and against all claims and demands
whatsoever.



     Section 145(a) of the General Corporation Law of the State of Delaware (the
"DGCL") provides that a Delaware corporation may indemnify any person who was or
is a party or is threatened to be made a party to any threatened, pending or
completed action, suit or proceeding, whether civil, criminal, administrative or
investigative (other than an action by or in the right of the corporation) by
reason of the fact that he is or was a director, officer, employee or agent of
the corporation or is or was serving at the request of the corporation as a
director, officer, employee or agent of another corporation, partnership, joint
venture, trust or other enterprise, against expenses, judgments, fines and
amounts paid in settlement actually and reasonably incurred by him in connection
with such action, suit or proceeding if he acted in good faith and in a manner
he reasonably believed to be in or not opposed to the best interests of the
corporation, and, with respect to any criminal action or proceeding, had no
cause to believe his conduct was unlawful.



     Section 145(b) of the DGCL provides that a Delaware corporation may
indemnify any person who was or is a party or is threatened to be made a party
to any threatened, pending or completed action or suit by or in the right of the
corporation to procure a judgment in its favor by reason of the fact that such
person acted in any of the capacities set forth above, against expenses actually
and reasonably incurred by him in connection with the defense or settlement of
such action or suit if he acted under similar standards, except that no
indemnification may be made in respect of any claim, issue or matter as to which
such person shall have been adjudged to be liable to the corporation unless and
only to the extent that the court in which such action or suit was brought shall
determine that despite the adjudication of liability, such person is fairly and
reasonably entitled to be indemnified for such expenses which the court shall
deem proper.

                                      II-1
<PAGE>   253


     Section 145 of the DGCL further provides that to the extent a director or
officer of a corporation has been successful in the defense of any action, suit
or proceeding referred to in subsections (a) and (b) or in the defense of any
claim, issue, or matter therein, he shall be indemnified against any expenses
actually and reasonably incurred by him in connection therewith; that
indemnification provided for by Section 145 shall not be deemed exclusive of any
other rights to which the indemnified party may be entitled; and that the
corporation may purchase and maintain insurance on behalf of a director,
officer, employee or agent of the corporation against any liability asserted
against him or incurred by him in any such capacity or arising out of his status
as such whether or not the corporation would have the power to indemnify him
against such liabilities under Section 145.



     Section 102(b)(7) of the DGCL provides that a corporation in its original
certificate of incorporation or an amendment thereto validly approved by
stockholders may eliminate or limit personal liability of members of its board
of directors or governing body for breach of a director's fiduciary duty.
However, no such provision may eliminate or limit the liability of a director
for breaching his duty of loyalty, failing to act on good faith, engaging in
intentional misconduct or knowingly violating a law, paying a dividend or
approving a stock repurchase which was illegal or obtaining an improper personal
benefit. A provision of this type has no effect on the availability of equitable
remedies, such as injunction or rescission, for breach of fiduciary duty.



     The Certificate of Incorporation of our general partner contains a
provision which limits the liability of the directors of the general partner to
the general partner or its stockholder (in their capacity as directors but not
in their capacity as officers) to the fullest extent permitted by the DGCL. In
addition, the Amended and Restated Bylaws of our general partner (as amended and
restated, the "Bylaws"), in substance, require the general partner to indemnify
each person who is or was a director, officer, employee or agent of the general
partner to the full extent permitted by the laws of the State of Delaware in the
event such person is involved in legal proceedings by reason of the fact that he
is or was a director, officer, employee or agent of the general partner, or is
or was serving at the general partner's request as a director, officer, employee
or agent of the general partner and its subsidiaries, another corporation,
partnership or other enterprise. Our general partner is also required to advance
to such persons payments incurred in defending a proceeding to which
indemnification might apply, provided the recipient provides an undertaking
agreeing to repay all such advanced amounts if it is ultimately determined that
he is not entitled to be indemnified. In addition, the Bylaws specifically
provide that the indemnification rights granted thereunder are non-exclusive.



     The general partner has entered into indemnification agreements with
certain of its current and past directors providing for indemnification to the
full extent permitted by the laws of the State of Delaware. These agreements
provide for specific procedures to assure the directors' rights to
indemnification, including procedures for directors to submit claims, for
determination of directors' entitlement to indemnification (including the
allocation of the burden of proof and selection of a reviewing party) and for
enforcement of directors' indemnification rights.



     Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers or persons controlling us or our general
partner pursuant to the foregoing, we and our general partner have been informed
that in the opinion of the SEC such indemnification is against public policy as
expressed in the Securities Act and is therefore unenforceable.


                                      II-2
<PAGE>   254

ITEM 21. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

     (A) EXHIBITS


<TABLE>
<CAPTION>
        EXHIBIT
          NO.                                    DESCRIPTION
        -------                                  -----------
<C>                      <S>
            1.1*         -- Purchase Agreement dated as of May 24, 1999 among (i)
                            Leviathan Gas Pipeline Partners, L.P., (ii) Leviathan
                            Finance Corporation, (iii) Delos Offshore Company,
                            L.L.C., Ewing Bank Gathering Company, L.L.C., Flextrend
                            Development Company, L.L.C., Green Canyon Pipe Line
                            Company, L.L.C., Leviathan Oil Transport Systems, L.L.C.,
                            Manta Ray Gathering Company, L.L.C., Poseidon Pipeline
                            Company, L.L.C., Sailfish Pipeline Company, L.L.C.,
                            Stingray Holding, L.L.C., Delaware Transco Hydrocarbons
                            Company, L.L.C., Texam Offshore Gas Transmission, L.L.C.,
                            Transco Offshore Pipeline Company, L.L.C, Tarpon
                            Transmission Company, Viosca Knoll Gathering Company, VK-
                            Main Pass Gathering Company, L.L.C., VK Deepwater
                            Gathering Company, L.L.C. and the Subsidiary Guarantors
                            from time to time party thereto (collectively, the
                            "Subsidiary Guarantors"), (iv) Donaldson, Lufkin &
                            Jenrette Securities Corporation, and (v) Chase Securities
                            Inc.
            3.1          -- Certificate of Limited Partnership of Leviathan (filed as
                            Exhibit 3.1 to Leviathan's Registration Statement on Form
                            S-1, File No. 33-55642).
            3.2          -- Amended and Restated Agreement of Limited Partnership of
                            Leviathan (filed as Exhibit 10.41 to Amendment No. 1 to
                            DeepTech's Registration Statement on Form S-1, File No.
                            33-73538).
            3.3          -- Amendment Number 1 to the Amended and Restated Agreement
                            of Limited Partnership of Leviathan (filed as Exhibit
                            10.1 to Leviathan's Current Report on Form 8-K dated
                            December 31, 1996, File No. 1-11680).
            3.4*         -- Amendment Number 2 to the Amended and Restated Agreement
                            of Limited Partnership of Leviathan.
            3.5*         -- Certificate of Incorporation of Leviathan Finance
                            Corporation.
            3.6*         -- Bylaws of Leviathan Finance Corporation.
            4.1*         -- Indenture dated as of May 27, 1999 among Leviathan Gas
                            Pipeline Partners, L.P., Leviathan Finance Corporation,
                            the Subsidiary Guarantors and Chase Bank of Texas, as
                            Trustee.
            4.2**        -- First Supplemental Indenture dated as of June 30, 1999.
            4.3**        -- Second Supplemental Indenture dated as of July 27, 1999.
            4.4*         -- Form of Certificate of 10 3/8% Series A Senior
                            Subordinated Note due 2009 (included in Exhibit 4.1
                            hereto).
            4.5*         -- Form of Certificate of 10 3/8% Series B Senior
                            Subordinated Note due 2009 (included in Exhibit 4.1
                            hereto).
            4.6*         -- Form of Guarantee Notation of securities issued pursuant
                            to the Indenture (included in Exhibit 4.1 hereto).
            4.7*         -- A/B Exchange Registration Rights Agreement dated as of
                            May 27, 1999 among Leviathan Gas Pipeline Partners, L.P.,
                            Leviathan Finance Corporation, the Subsidiary Guarantors,
                            Donaldson, Lufkin & Jenrette Securities Corporation, and
                            Chase Securities Inc.
            5.1**        -- Opinion of Akin, Gump, Strauss, Hauer & Feld, L.L.P.
           10.1          -- First Amended and Restated Management Agreement, dated
                            June 27, 1994 and effective as of July 1, 1992, between
                            DeepTech International Inc. ("DeepTech") and the General
                            Partner (filed as Exhibit 10.1 to DeepTech's Annual
                            Report on Form 10-K for 1994, File No. 0-23934).
           10.2          -- First Amendment to First Amended and Restated Management
                            Agreement between DeepTech and the General Partner (filed
                            as Exhibit 10.76 to DeepTech's Registration Statement on
                            Form S-1, File No. 33-88688).
</TABLE>


                                      II-3
<PAGE>   255


<TABLE>
<CAPTION>
        EXHIBIT
          NO.                                    DESCRIPTION
        -------                                  -----------
<C>                      <S>
           10.3          -- Second Amendment to First Amended and Restated Management
                            Agreement between DeepTech and the General Partner (filed
                            as Exhibit 10.18 to Leviathan's Annual Report on Form
                            10-K for the fiscal year ended December 31, 1995, File
                            No. 1-11680).
           10.4*         -- Third Amendment to First Amended and Restated Management
                            Agreement between DeepTech and the General Partner.
           10.5          -- Fourth Amendment to First Amended and Restated Management
                            Agreement between DeepTech and the General Partner (filed
                            as Exhibit 10.1 to Leviathan's Quarterly Report on Form
                            10-Q for the quarterly period ended June 30, 1997, File
                            No. 1-11680).
           10.6          -- Fifth Amendment to First Amended and Restated Management
                            Agreement between DeepTech and the General Partner (filed
                            as Exhibit 10.1 to Leviathan's Quarterly Report on Form
                            10-Q for the quarterly period ended September 30, 1997,
                            File No. 1-11680).
           10.7          -- Sixth Amendment to First Amended and Restated Management
                            Agreement between DeepTech and the General Partner (filed
                            as Exhibit 10.2 to Leviathan's Annual Report on Form 10-K
                            for the fiscal year ended December 31, 1998, File No.
                            1-11680).
           10.8          -- Redemption Agreement dated February 27, 1998 between
                            Tatham Offshore, Inc. and Flextrend Development Company,
                            L.L.C., a subsidiary of Leviathan (filed as Exhibit 10.1
                            to Leviathan's Quarterly Report on Form 10-Q for the
                            quarterly period ended September 30, 1998, File No.
                            1-11680).
           10.9          -- Contribution Agreement between Leviathan and El Paso
                            Field Services Company (filed as Exhibit C to Leviathan's
                            Schedule 14A (Rule 14A-101) Proxy Statement effective
                            February 9, 1998).
           10.10         -- Leviathan 1998 Unit Option Plan for Non-Employee
                            Directors Effective as of August 14, 1998 (filed as
                            Exhibit 10.2 to Leviathan's Quarterly Report on Form 10-Q
                            for the quarterly period ended September 30, 1998, File
                            No. 1-11680).
           10.11         -- Leviathan Unit Rights Appreciation Plan (filed as Exhibit
                            10.25 to Leviathan's Annual Report on Form 10-K for the
                            fiscal year ended December 31, 1996, File No. 1-11680).
           10.12         -- Leviathan 1998 Omnibus Compensation Plan, Amended and
                            Restated, Effective as of January 1, 1999 (filed as
                            Exhibit 10.9 to Leviathan's Annual Report on Form 10-K
                            for the fiscal year ended December 31, 1998, File No.
                            1-11680).
           10.13         -- Purchase and Sale Agreement between Natural Gas Pipeline
                            Company of America as Seller and Leviathan as Buyer dated
                            as of June 30, 1999 (filed as Exhibit 10.1 to Leviathan's
                            Current Report on Form 8-K dated July 15, 1999, File No.
                            1-11680).
           10.14**       -- Third Amended and Restated Credit Agreement dated as of
                            March 23, 1995, as amended and restated through May 27,
                            1999 among Leviathan, Leviathan Finance Corporation, The
                            Chase Manhattan Bank, as administrative agent, Credit
                            Lyonnais, as syndication agent, BankBoston, N.A., as
                            documentation agent, and the banks and other financial
                            institutions from time to time parties thereto.
           12.1*         -- Statement Regarding Computation of Ratios.
           21.1*         -- List of Subsidiaries of the Leviathan Gas Pipeline
                            Partners, L.P.
           23.1**        -- Consent of PricewaterhouseCoopers LLP.
           23.2**        -- Consent of Deloitte & Touche LLP.
           23.3**        -- Consent of Arthur Andersen LLP.
           23.4**        -- Consent of Netherland, Sewell & Associates, Inc.
</TABLE>


                                      II-4
<PAGE>   256


<TABLE>
<CAPTION>
        EXHIBIT
          NO.                                    DESCRIPTION
        -------                                  -----------
<C>                      <S>
           23.5**        -- Consent of Akin, Gump, Strauss, Hauer & Feld, L.L.P.
                            (included in Exhibit 5.1 hereto).
           24.1*         -- Power of Attorney (included on the signature pages of
                            this Registration Statement on Form S-4).
           25.1*         -- Statement of Eligibility of Trustee.
           27.1          -- Financial Data Schedule (filed as Exhibit 27 to
                            Leviathan's Annual Report on Form 10-K for the fiscal
                            year ended December 31, 1998, File No. 1-11680).
           27.2          -- Financial Data Schedule (filed as Exhibit 27 to
                            Leviathan's Quarterly Report on Form 10-Q for the
                            quarterly period ended March 31, 1999, File No. 1-11680).
           99.1**        -- Form of Letter of Transmittal for the 10 3/8% Series B
                            Senior Subordinated Note due 2009.
           99.2**        -- Form of Notice of Guaranteed Delivery for the 10 3/8%
                            Series B Senior Subordinated Note due 2009.
           99.3**        -- Letter to Registered Holders.
           99.4**        -- Letter to Registered Holders and Depository Trust Company
                            Participants.
           99.5**        -- Letter to Clients of Registered Holders and Depository
                            Trust Company Participants.
           99.6**        -- Guidelines for Certificate of Taxpayer Identification
                            Number on substitute Form W-9 (included in Exhibit 99.1
                            hereto).
</TABLE>


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


 * Previously filed.



** Filed herewith.



     (b) Consolidated Financial Statement Schedules, Years ended December 31,
1996, 1997 and 1998.


     All schedules are omitted because the required information is inapplicable
or the information is presented in the Consolidated Financial Statements or
related notes.

ITEM 22. UNDERTAKINGS


     (a) Insofar as indemnification for liabilities arising under the Securities
Act may be permitted to directors, officers and controlling persons of the
registrant pursuant to the foregoing provisions, or otherwise, the registrant
has been advised that in the opinion of the SEC such indemnification is against
public policy as expressed in the Securities Act and is, therefore,
unenforceable. In the event that a claim for indemnification against such
liabilities (other than the payment by the registrant of expenses incurred or
paid by a director, officer or controlling person of the registrant in the
successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, each of the undersigned registrants will, unless in the opinion of
its counsel the matter has been settled by controlling precedent, submit to a
court of appropriate jurisdiction the question whether such indemnification by
it is against public policy as expressed in the Securities Act and will be
governed by the final adjudication of such issue.



     (b) Each of the undersigned registrants hereby undertakes that:


          (1) for purposes of determining any liability under the Act, the
     information omitted from the form of prospectus filed as part of this
     registration statement in reliance upon Rule 430A and contained in a form
     of prospectus filed by Leviathan pursuant to Rule 424(b)(1) or (4) or
     497(h) under the Act shall be deemed to be part of this registration
     statement as of the time it was declared effective.

          (2) for the purpose of determining any liability under the Act, each
     post-effective amendment that contains a form of prospectus shall be deemed
     to be a new registration statement relating to the securities offered
     therein, and the offering of such securities at that time shall be deemed
     to be the initial bona fide offering thereof.

                                      II-5
<PAGE>   257


          (3) hereby undertakes that, for purposes of determining any liability
     under the Securities Act of 1933, each filing of the registrant's annual
     report pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of
     1934 (and, where applicable, each filing of an employee benefit plan's
     annual report pursuant to Section 15(d) of the Securities Exchange Act of
     1934) that is incorporated by reference in the registration statement shall
     be deemed to be a new registration statement relating to the securities
     offered therein, and the offering of such securities at that time shall be
     deemed to be the initial bona fide offering thereof.



          (4) hereby undertakes to respond to requests for information that is
     incorporated by reference into this prospectus pursuant to Item 4, 10(b),
     11 or 13 of this Form, within one business day of receipt of such request,
     and to send the incorporated documents by first class mail or other equally
     prompt means. This includes information contained in documents filed
     subsequent to the effective date of the registration statement through the
     date of responding to the request.



          (5) hereby undertakes to supply by means of a post-effective amendment
     all information concerning a transaction, and the company being acquired
     involved therein, that was not the subject of and included in the
     registration statement when it became effective.


                                      II-6
<PAGE>   258

                                   SIGNATURES


     Pursuant to the requirements of the Securities Act of 1933, as amended, the
undersigned registrants have duly caused this Registration Statement to be
signed on their behalf by the undersigned, thereunto duly authorized, in the
City of Houston, Texas, on August 26, 1999.


                                          LEVIATHAN GAS PIPELINE PARTNERS, L.P.

                                          By: Leviathan Gas Pipeline Company,
                                              its general partner

                                          By:      /s/ KEITH B. FORMAN
                                            ------------------------------------
                                              Name: Keith B. Forman
                                              Title: Chief Financial Officer

                                          LEVIATHAN FINANCE CORPORATION

                                          By:      /s/ KEITH B. FORMAN
                                            ------------------------------------
                                              Name: Keith B. Forman
                                              Title: Chief Financial Officer

                                          DELOS OFFSHORE COMPANY, L.L.C.

                                          By:      /s/ KEITH B. FORMAN
                                            ------------------------------------
                                              Name: Keith B. Forman
                                              Title: Chief Financial Officer

                                          EWING BANK GATHERING COMPANY, L.L.C.

                                          By:      /s/ KEITH B. FORMAN
                                            ------------------------------------
                                              Name: Keith B. Forman
                                              Title: Chief Financial Officer

                                      II-7
<PAGE>   259

                                          FLEXTREND DEVELOPMENT COMPANY, L.L.C.

                                          By:       /s/ KEITH B. FORMAN
                                              ----------------------------------
                                              Name: Keith B. Forman
                                              Title: Chief Financial Officer

                                          GREEN CANYON PIPE LINE COMPANY, L.L.C.

                                          By:      /s/ KEITH B. FORMAN
                                            ------------------------------------
                                              Name: Keith B. Forman
                                              Title: Chief Financial Officer

                                          LEVIATHAN OIL TRANSPORT SYSTEMS,
                                          L.L.C.

                                          By:      /s/ KEITH B. FORMAN
                                            ------------------------------------
                                              Name: Keith B. Forman
                                              Title: Chief Financial Officer


                                          LEVIATHAN OPERATING COMPANY, L.L.C.



                                          By:      /s/ KEITH B. FORMAN

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

                                              Name: Keith B. Forman


                                              Title: Chief Financial Officer


                                          MANTA RAY GATHERING COMPANY, L.L.C.

                                          By:      /s/ KEITH B. FORMAN
                                            ------------------------------------
                                              Name: Keith B. Forman
                                              Title: Chief Financial Officer

                                      II-8
<PAGE>   260


                                          NALOCO, L.L.C.



                                          By:       /s/ KEITH B. FORMAN

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

                                              Name: Keith B. Forman


                                              Title: Chief Financial Officer



                                          MORAY PIPELINE COMPANY, L.L.C.



                                          By:      /s/ KEITH B. FORMAN

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

                                              Name: Keith B. Forman


                                              Title: Chief Financial Officer


                                          POSEIDON PIPELINE COMPANY, L.L.C.

                                          By:      /s/ KEITH B. FORMAN
                                            ------------------------------------
                                              Name: Keith B. Forman
                                              Title: Chief Financial Officer

                                          SAILFISH PIPELINE COMPANY, L.L.C.

                                          By:      /s/ KEITH B. FORMAN
                                            ------------------------------------
                                              Name: Keith B. Forman
                                              Title: Chief Financial Officer

                                          STINGRAY HOLDING, L.L.C.

                                          By:      /s/ KEITH B. FORMAN
                                            ------------------------------------
                                              Name: Keith B. Forman
                                              Title: Chief Financial Officer

                                      II-9
<PAGE>   261

                                          TARPON TRANSMISSION COMPANY

                                          By:       /s/ KEITH B. FORMAN
                                              ----------------------------------
                                              Name: Keith B. Forman
                                              Title: Chief Financial Officer

                                          TRANSCO HYDROCARBONS COMPANY, L.L.C.

                                          By:      /s/ KEITH B. FORMAN
                                            ------------------------------------
                                              Name: Keith B. Forman
                                              Title: Chief Financial Officer

                                          TEXAM OFFSHORE GAS TRANSMISSION,
                                          L.L.C.

                                          By:      /s/ KEITH B. FORMAN
                                            ------------------------------------
                                              Name: Keith B. Forman
                                              Title: Chief Financial Officer

                                          TRANSCO OFFSHORE PIPELINE COMPANY,
                                          L.L.C.

                                          By:      /s/ KEITH B. FORMAN
                                            ------------------------------------
                                              Name: Keith B. Forman
                                              Title: Chief Financial Officer


                                          UTOS HOLDING, L.L.C.



                                          By:      /s/ KEITH B. FORMAN

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

                                              Name: Keith B. Forman


                                              Title: Chief Financial Officer


                                      II-10
<PAGE>   262

                                          VK DEEPWATER GATHERING COMPANY, L.L.C.

                                          By:       /s/ KEITH B. FORMAN
                                              ----------------------------------
                                              Name: Keith B. Forman
                                              Title: Chief Financial Officer

                                          VK-MAIN PASS GATHERING COMPANY, L.L.C.

                                          By:      /s/ KEITH B. FORMAN
                                            ------------------------------------
                                              Name: Keith B. Forman
                                              Title: Chief Financial Officer

                                          VIOSCA KNOLL GATHERING COMPANY

                                          By:      /s/ KEITH B. FORMAN
                                            ------------------------------------
                                              Name: Keith B. Forman
                                              Title: Chief Financial Officer

                                      II-11
<PAGE>   263

                               POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that the persons whose signatures
appear below, constitute and appoint H. Brent Austin and Britton White Jr., and
each of them as their true and lawful attorneys-in-fact and agents, with full
power of substitution and resubstitution, for them and in their names, places
and steads, in any and all capacities, to sign the Registration Statement to be
filed in connection with the exchange offering of Leviathan Gas Pipeline
Partners, L.P. and Leviathan Finance Corporation and each of the Subsidiary
Guarantors listed on pages II-6 through II-9 and any and all amendments
(including post-effective amendments) to the Registration Statement, and any
subsequent registration statement filed pursuant to Rule 462(b) under the
Securities Act of 1933, as amended, and to file the same, with all exhibits
thereto, and the other documents in connection therewith, with the Securities
and Exchange Commission, granting unto said attorneys-in-fact and agents, and
each of them, full power and authority to do and perform each and every act and
thing requisite and necessary to be done in connection therewith, as fully to
all intents and purposes as they might or could do in person, hereby ratifying
and confirming all that said attorneys-in-fact and agents, or any of them, or
their or his or her substitute or substitutes, may lawfully do or cause to be
done by virtue hereof.
                             ---------------------

     Pursuant to the requirements of the Securities Act of 1933, as amended,
this Registration Statement has been signed below by the following persons in
the capacities and on the dates indicated below:


<TABLE>
<CAPTION>
                      SIGNATURE                                     TITLE                    DATE
                      ---------                                     -----                    ----
<C>                                                    <S>                              <C>
                          *                            Chairman of the Board of the     August 26, 1999
- -----------------------------------------------------    General Partner, on behalf of
                   William A. Wise                       Leviathan and its
                                                         subsidiaries

                          *                            Director and Chief Executive     August 26, 1999
- -----------------------------------------------------    Officer of the General
                    Grant E. Sims                        Partner, on behalf of
                                                         Leviathan and its
                                                         subsidiaries

                          *                            Director and President of the    August 26, 1999
- -----------------------------------------------------    General Partner, on behalf of
                   James H. Lytal                        Leviathan and its
                                                         subsidiaries

                          *                            Director and Executive Vice      August 26, 1999
- -----------------------------------------------------    President of the General
                   H. Brent Austin                       Partner, on behalf of
                                                         Leviathan and its
                                                         subsidiaries

                          *                            Director and Executive Vice      August 26, 1999
- -----------------------------------------------------    President of the General
                 Robert G. Phillips                      Partner, on behalf of
                                                         Leviathan and its
                                                         subsidiaries

                          *                            Vice President and Chief         August 26, 1999
- -----------------------------------------------------    Financial Officer of the
                   Keith B. Forman                       General Partner, on behalf of
                                                         Leviathan and its
                                                         subsidiaries

                          *                            Vice President and Controller    August 26, 1999
- -----------------------------------------------------    of the General Partner, on
                   D. Mark Leland                        behalf of Leviathan and its
                                                         subsidiaries
</TABLE>


                                      II-12
<PAGE>   264


<TABLE>
<CAPTION>
                      SIGNATURE                                     TITLE                    DATE
                      ---------                                     -----                    ----
<C>                                                    <S>                              <C>
                          *                            Director of the General          August 26, 1999
- -----------------------------------------------------    Partner, on behalf of
                  Michael B. Bracy                       Leviathan and its
                                                         subsidiaries

                          *                            Director of the General          August 26, 1999
- -----------------------------------------------------    Partner, on behalf of
                  H. Douglas Church                      Leviathan and its
                                                         subsidiaries

                          *                            Director of the General          August 26, 1999
- -----------------------------------------------------    Partner, on behalf of
                   Malcolm Wallop                        Leviathan and its
                                                         subsidiaries


*By:          /s/ BRITTON WHITE JR.
     ------------------------------------------------
                  Britton White Jr.
                  Attorney-in-fact
</TABLE>


                                      II-13
<PAGE>   265

                                 EXHIBIT INDEX


<TABLE>
<CAPTION>
        EXHIBIT
          NO.                                    DESCRIPTION
        -------                                  -----------
<C>                      <S>
            1.1*         -- Purchase Agreement dated as of May 24, 1999 among (i)
                            Leviathan Gas Pipeline Partners, L.P., (ii) Leviathan
                            Finance Corporation, (iii) Delos Offshore Company,
                            L.L.C., Ewing Bank Gathering Company, L.L.C., Flextrend
                            Development Company, L.L.C., Green Canyon Pipe Line
                            Company, L.L.C., Leviathan Oil Transport Systems, L.L.C.,
                            Manta Ray Gathering Company, L.L.C., Poseidon Pipeline
                            Company, L.L.C., Sailfish Pipeline Company, L.L.C.,
                            Stingray Holding, L.L.C., Delaware Transco Hydrocarbons
                            Company, L.L.C., Texam Offshore Gas Transmission, L.L.C.,
                            Transco Offshore Pipeline Company, L.L.C, Tarpon
                            Transmission Company, Viosca Knoll Gathering Company, VK-
                            Main Pass Gathering Company, L.L.C., VK Deepwater
                            Gathering Company, L.L.C. and the Subsidiary Guarantors
                            from time to time party thereto (collectively, the
                            "Subsidiary Guarantors"), (iv) Donaldson, Lufkin &
                            Jenrette Securities Corporation, and (v) Chase Securities
                            Inc.
            3.1          -- Certificate of Limited Partnership of Leviathan (filed as
                            Exhibit 3.1 to Leviathan's Registration Statement on Form
                            S-1, File No. 33-55642).
            3.2          -- Amended and Restated Agreement of Limited Partnership of
                            Leviathan (filed as Exhibit 10.41 to Amendment No. 1 to
                            DeepTech's Registration Statement on Form S-1, File No.
                            33-73538).
            3.3          -- Amendment Number 1 to the Amended and Restated Agreement
                            of Limited Partnership of Leviathan (filed as Exhibit
                            10.1 to Leviathan's Current Report on Form 8-K dated
                            December 31, 1996, File No. 1-11680).
            3.4*         -- Amendment Number 2 to the Amended and Restated Agreement
                            of Limited Partnership of Leviathan.
            3.5*         -- Certificate of Incorporation of Leviathan Finance
                            Corporation.
            3.6*         -- Bylaws of Leviathan Finance Corporation.
            4.1*         -- Indenture dated as of May 27, 1999 among Leviathan Gas
                            Pipeline Partners, L.P., Leviathan Finance Corporation,
                            the Subsidiary Guarantors and Chase Bank of Texas, as
                            Trustee.
            4.2**        -- First Supplemental Indenture dated as of June 30, 1999.
            4.3**        -- Second Supplemental Indenture dated as of July 27, 1999.
            4.4*         -- Form of Certificate of 10 3/8% Series A Senior
                            Subordinated Note due 2009 (included in Exhibit 4.1
                            hereto).
            4.5*         -- Form of Certificate of 10 3/8% Series B Senior
                            Subordinated Note due 2009 (included in Exhibit 4.1
                            hereto).
            4.6*         -- Form of Guarantee Notation of securities issued pursuant
                            to the Indenture (included in Exhibit 4.1 hereto).
            4.7*         -- A/B Exchange Registration Rights Agreement dated as of
                            May 27, 1999 among Leviathan Gas Pipeline Partners, L.P.,
                            Leviathan Finance Corporation, the Subsidiary Guarantors,
                            Donaldson, Lufkin & Jenrette Securities Corporation, and
                            Chase Securities Inc.
            5.1**        -- Opinion of Akin, Gump, Strauss, Hauer & Feld, L.L.P.
           10.1          -- First Amended and Restated Management Agreement, dated
                            June 27, 1994 and effective as of July 1, 1992, between
                            DeepTech International Inc. ("DeepTech") and the General
                            Partner (filed as Exhibit 10.1 to DeepTech's Annual
                            Report on Form 10-K for 1994, File No. 0-23934).
</TABLE>

<PAGE>   266


<TABLE>
<CAPTION>
        EXHIBIT
          NO.                                    DESCRIPTION
        -------                                  -----------
<C>                      <S>
           10.2          -- First Amendment to First Amended and Restated Management
                            Agreement between DeepTech and the General Partner (filed
                            as Exhibit 10.76 to DeepTech's Registration Statement on
                            Form S-1, File No. 33-88688).
           10.3          -- Second Amendment to First Amended and Restated Management
                            Agreement between DeepTech and the General Partner (filed
                            as Exhibit 10.18 to Leviathan's Annual Report on Form
                            10-K for the fiscal year ended December 31, 1995, File
                            No. 1-11680).
           10.4*         -- Third Amendment to First Amended and Restated Management
                            Agreement between DeepTech and the General Partner.
           10.5          -- Fourth Amendment to First Amended and Restated Management
                            Agreement between DeepTech and the General Partner (filed
                            as Exhibit 10.1 to Leviathan's Quarterly Report on Form
                            10-Q for the quarterly period ended June 30, 1997, File
                            No. 1-11680).
           10.6          -- Fifth Amendment to First Amended and Restated Management
                            Agreement between DeepTech and the General Partner (filed
                            as Exhibit 10.1 to Leviathan's Quarterly Report on Form
                            10-Q for the quarterly period ended September 30, 1997,
                            File No. 1-11680).
           10.7          -- Sixth Amendment to First Amended and Restated Management
                            Agreement between DeepTech and the General Partner (filed
                            as Exhibit 10.2 to Leviathan's Annual Report on Form 10-K
                            for the fiscal year ended December 31, 1998, File No.
                            1-11680).
           10.8          -- Redemption Agreement dated February 27, 1998 between
                            Tatham Offshore, Inc. and Flextrend Development Company,
                            L.L.C., a subsidiary of Leviathan (filed as Exhibit 10.1
                            to Leviathan's Quarterly Report on Form 10-Q for the
                            quarterly period ended September 30, 1998, File No.
                            1-11680).
           10.9          -- Contribution Agreement between Leviathan and El Paso
                            Field Services Company (filed as Exhibit C to Leviathan's
                            Schedule 14A (Rule 14A-101) Proxy Statement effective
                            February 9, 1998).
           10.10         -- Leviathan 1998 Unit Option Plan for Non-Employee
                            Directors Effective as of August 14, 1998 (filed as
                            Exhibit 10.2 to Leviathan's Quarterly Report on Form 10-Q
                            for the quarterly period ended September 30, 1998, File
                            No. 1-11680).
           10.11         -- Leviathan Unit Rights Appreciation Plan (filed as Exhibit
                            10.25 to Leviathan's Annual Report on Form 10-K for the
                            fiscal year ended December 31, 1996, File No. 1-11680).
           10.12         -- Leviathan 1998 Omnibus Compensation Plan, Amended and
                            Restated, Effective as of January 1, 1999 (filed as
                            Exhibit 10.9 to Leviathan's Annual Report on Form 10-K
                            for the fiscal year ended December 31, 1998, File No.
                            1-11680).
           10.13         -- Purchase and Sale Agreement between Natural Gas Pipeline
                            Company of America as Seller and Leviathan as Buyer dated
                            as of June 30, 1999 (filed as Exhibit 10.1 to Leviathan's
                            Current Report on Form 8-K dated July 15, 1999, File No.
                            1-11680).
</TABLE>

<PAGE>   267


<TABLE>
<CAPTION>
        EXHIBIT
          NO.                                    DESCRIPTION
        -------                                  -----------
<C>                      <S>
           10.14**       -- Third Amended and Restated Credit Agreement dated as of
                            March 23, 1995, as amended and restated through May 27,
                            1999 among Leviathan, Leviathan Finance Corporation, The
                            Chase Manhattan Bank, as administrative agent, Credit
                            Lyonnais, as syndication agent, BankBoston, N.A., as
                            documentation agent, and the banks and other financial
                            institutions from time to time party thereto.
           12.1*         -- Statement Regarding Computation of Ratios.
           21.1*         -- List of Subsidiaries of the Leviathan Gas Pipeline
                            Partners, L.P.
           23.1**        -- Consent of PricewaterhouseCoopers LLP.
           23.2**        -- Consent of Deloitte & Touche LLP.
           23.3**        -- Consent of Arthur Andersen LLP.
           23.4**        -- Consent of Netherland, Sewell & Associates, Inc.
           23.5*         -- Consent of Akin, Gump, Strauss, Hauer & Feld, L.L.P.
                            (included in Exhibit 5.1 hereto).
           24.1*         -- Power of Attorney (included on the signature pages of
                            this Registration Statement on Form S-4).
           25.1*         -- Statement of Eligibility of Trustee.
           27.1          -- Financial Data Schedule (filed as Exhibit 27 to
                            Leviathan's Annual Report on Form 10-K for the fiscal
                            year ended December 31, 1998, File No. 1-11680).
           27.2          -- Financial Data Schedule (filed as Exhibit 27 to
                            Leviathan's Quarterly Report on Form 10-Q for the
                            quarterly period ended March 31, 1999, File No. 1-11680).
           99.1**        -- Form of Letter of Transmittal for the 10 3/8% Series B
                            Senior Subordinated Note due 2009.
           99.2**        -- Form of Notice of Guaranteed Delivery for the 10 3/8%
                            Series B Senior Subordinated Note due 2009.
           99.3**        -- Letter to Registered Holders.
           99.4**        -- Letter to Registered Holders and Depository Trust Company
                            Participants.
           99.5**        -- Letter to Clients of Registered Holders and Depository
                            Trust Company Participants.
           99.6**        -- Guidelines for Certificate of Taxpayer Identification
                            Number on substitute Form W-9 (included in Exhibit 99.1
                            hereto).
</TABLE>


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


 * Previously filed.



** Filed herewith.




<PAGE>   1

                                                                     EXHIBIT 4.2

================================================================================




                      LEVIATHAN GAS PIPELINE PARTNERS, L.P.
                 LEVIATHAN FINANCE CORPORATION, AS THE ISSUERS,

                                       AND

             THE SUBSIDIARIES PARTY HERETO, AS SUBSIDIARY GUARANTORS

                                       AND

              CHASE BANK OF TEXAS, NATIONAL ASSOCIATION, AS TRUSTEE

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

                          FIRST SUPPLEMENTAL INDENTURE

                            DATED AS OF JUNE 30, 1999

                                       TO

                                    INDENTURE

                            DATED AS OF MAY 27, 1999

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


                                  $175,000,000

              10 3/8% SENIOR SUBORDINATED NOTES DUE 2009, SERIES A
              10 3/8% SENIOR SUBORDINATED NOTES DUE 2009, SERIES B




================================================================================

<PAGE>   2

                          FIRST SUPPLEMENTAL INDENTURE

         THIS FIRST SUPPLEMENTAL INDENTURE (this "Supplemental Indenture"),
dated as of June 30, 1999, is by and among Leviathan Gas Pipeline Partners,
L.P., a Delaware limited partnership, Leviathan Finance Corporation, a Delaware
corporation, the guarantor parties hereto, and Chase Bank of Texas, National
Association, a national banking association, as trustee.

                              W I T N E S S E T H:

         WHEREAS, the Issuers (herein defined), the Subsidiary Guarantors
(herein defined) and the Trustee (herein defined) entered into an Indenture,
dated as of May 27, 1999 (the "Indenture"), relating to $175,000,000 of the
Company's 10 3/8% Senior Subordinated Notes due 2009;

         WHEREAS, the Partnership (herein defined) has formed the following
Restricted Subsidiaries (herein defined), each of which will become Subsidiary
Guarantors under the Indenture pursuant to the terms of this Supplemental
Indenture: (i) Leviathan Operating Company, L.L.C., a Delaware limited liability
company, (ii) Naloco, L.L.C., a Delaware limited liability company, and (iii)
Natoco, L.L.C., a Delaware limited liability company (collectively, the "New
Guarantors");

         WHEREAS, this Supplemental Indenture is executed and delivered pursuant
to Sections 4.14 and 11.01 of the Indenture;

         WHEREAS, the Issuers, the Subsidiary Guarantors (which term includes
the New Guarantors) and the Trustee desire to enter into this Supplemental
Indenture to provide for the Guarantor's guarantee of the payment of securities
on the same terms and conditions as the Guarantees by the other Subsidiary
Guarantors;

         WHEREAS, all conditions precedent provided for in the Indenture
relating to this Supplemental Indenture have been complied with; and

         NOW, THEREFORE, in consideration of the premises herein contained, and
for other good and valuable considerations, the receipt and sufficiency of which
are hereby acknowledged, the Issuers, the Subsidiary Guarantors and the Trustee
mutually covenant and agree for the equal and proportionate benefit of all
Holders (herein defined) of the Notes (herein defined) as follows:

               SECTION 1. INCORPORATION OF INDENTURE; DEFINITIONS

         1.1 INCORPORATION OF INDENTURE. This Supplemental Indenture constitutes
a supplement to the Indenture, and the Indenture and this Supplemental Indenture
shall be read together and shall have effect so far as practicable as though all
of the provisions thereof and hereof are contained in one instrument.

         1.2 DEFINITIONS. All capitalized terms used herein and not otherwise
defined herein shall have the respective meanings assigned to such terms in the
Indenture.

                                       1
<PAGE>   3

                       SECTION 2. SUPPLEMENTAL PROVISIONS

         2.1 UNCONDITIONAL GUARANTEE. Subject to the provisions of Article 11 of
the Indenture, each of the New Guarantors shall be a Subsidiary Guarantor under
the terms of the Indenture and each hereby, jointly and severally,
unconditionally guarantee to each Holder of a Note authenticated and delivered
by the Trustee and to the Trustee and its successors and assigns, irrespective
of the validity and enforceability of the Indenture, the Notes or the
Obligations of the Issuers under the Indenture or the Notes, that:

         (a)  the principal of, premium, interest and Liquidated Damages, if
              any, on the Notes shall be promptly paid in full when due, whether
              at the maturity or interest payment or mandatory redemption date,
              by acceleration, redemption or otherwise, and interest on the
              overdue principal of, premium, interest and Liquidated Damages, if
              any, on the Notes, if any, if lawful, and all other Obligations of
              the Issuers to the Holders or the Trustee under the Indenture and
              the Notes shall be promptly paid in full or performed, all in
              accordance with the terms of the Indenture and the Notes; and

         (b)  in case of any extension of time of payment or renewal of any
              Notes or any of such other obligations, that same shall be
              promptly paid in full when due or performed in accordance with the
              terms of the extension or renewal, whether at Stated Maturity, by
              acceleration or otherwise. Failing payment when due of any amount
              so guaranteed or any performance so guaranteed for whatever
              reason, the Subsidiary Guarantors shall be jointly and severally
              obligated to pay the same immediately.

The New Guarantors hereby agree that their obligations hereunder and under the
Indenture shall be unconditional, irrespective of the validity, regularity or
enforceability of the Notes or the Indenture, the absence of any action to
enforce the same, any waiver or consent by any Holder of the Notes with respect
to any provisions of the Indenture and the Notes, the recovery of any judgment
against the Issuers, any action to enforce the same or any other circumstance
which might otherwise constitute a legal or equitable discharge or defense of a
Subsidiary Guarantor. Each New Guarantor hereby waives diligence, presentment,
demand of payment, filing of claims with a court in the event of insolvency or
bankruptcy of the Issuers, any right to require a proceeding first against the
Issuers, protest, notice and all demands whatsoever and covenant that the
Guarantees shall not be discharged except by complete performance of the
obligations contained in the Notes and the Indenture.

         If any Holder or the Trustee is required by any court or otherwise to
return to the Issuers or Subsidiary Guarantors, or any custodian, trustee,
liquidator or other similar official acting in relation to either the Issuers or
Subsidiary Guarantors, any amount paid by either to the Trustee or such Holder,
these Guarantees, to the extent theretofore discharged, shall be reinstated in
full force and effect. Each New Guarantor agrees that it shall not be entitled
to any right of subrogation in relation to the Holders in respect of any
obligations guaranteed under the Indenture until payment in full of all
obligations guaranteed under the Indenture.

         Each New Guarantor further agrees that, as between the Subsidiary
Guarantors, on the one hand, and the Holders and the Trustee, on the other hand,
(x) the maturity of the Obligations guaranteed under the Indenture may be
accelerated as provided in Article 6 of the Indenture for the



                                       2

<PAGE>   4

purposes of these Guarantees, notwithstanding any stay, injunction or other
prohibition preventing such acceleration in respect of the obligations
guaranteed under the Indenture, and (y) in the event of any declaration of
acceleration of such Obligations as provided in Article 6 of the Indenture, such
Obligations (whether or not due and payable) shall forthwith become due and
payable by the Subsidiary Guarantors for the purpose of these Guarantees. The
New Guarantors agree that the Subsidiary Guarantors shall have the right to seek
contribution from any non-paying Subsidiary Guarantor so long as the exercise of
such right does not impair the rights of the Holders under these Guarantees.

         2.2 OTHER GUARANTEE TERMS. Each New Guarantor hereby confirms, adopts
and acknowledges each of the provisions of the Indenture relating to the
Subsidiary Guarantors and the Guarantees, including, but not limited to Articles
4 and 11.

                            SECTION 3. MISCELLANEOUS

         3.1 COUNTERPARTS. This Supplemental Indenture may be signed in
counterparts and by the different parties hereto in separate counterparts, each
of which shall constitute an original and all of which together shall constitute
one and the same instrument.

         3.2 SEVERABILITY. In case any provision in this Supplemental Indenture
shall be invalid, illegal or unenforceable, the validity, legality and
enforceability of the remaining provisions shall not in any way be affected or
impaired thereby.

         3.3 HEADINGS. The headings of the Sections of this Supplemental
Indenture have been inserted for convenience of reference only, are not to be
considered a part hereof and shall not modify or restrict any of the terms or
provisions hereof.

         3.4 SUCCESSORS. All agreements of the Issuers and the Subsidiary
Guarantors in this Supplemental Indenture shall bind their respective
successors. All agreements of the Trustee in this Supplemental Indenture shall
bind its successors.

         3.5 GOVERNING LAW. THIS SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK BUT WITHOUT
GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT
THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY.

         3.6 FULL FORCE AND EFFECT. The Indenture, as supplemented by this
Supplemental Indenture, remains in full force and effect and is hereby ratified
and confirmed as the valid and binding obligation of the parties hereto.


                                       3

<PAGE>   5

         3.7 TRUSTEE. The Trustee accepts the modifications of trusts referenced
in the Indenture and effected by this Supplemental Indenture. Without limiting
the generality of the foregoing, the Trustee assumes no responsibility for the
correctness of the recitals herein contained, which shall be taken as the
statements of the Company and the Subsidiary Guarantors, and the Trustee shall
not be responsible or accountable in any way whatsoever for or with respect to
the validity or execution or sufficiency of this Supplemental Indenture, and the
Trustee makes no representation with respect thereto.






                                       4
<PAGE>   6

         IN WITNESS WHEREOF, the parties hereto have executed this Supplemental
Indenture as of the date first above written.

LEVIATHAN GAS PIPELINE PARTNERS,             LEVIATHAN FINANCE CORPORATION
L.P.


/s/ T. Darty Smith                           /s/ T. Darty Smith
- -----------------------------------------    -----------------------------------
T. Darty Smith                               T. Darty Smith
Vice President                               Vice President


CHASE BANK OF TEXAS,
NATIONAL ASSOCIATION, as Trustee


By: /s/ Mauri J. Cowen
   -------------------------------------
Name:   Mauri J. Cowen
     -----------------------------------
Title:  Vice President and Trust Officer
       ---------------------------------

GUARANTORS:


LEVIATHAN OPERATING                          NATOCO, L.L.C.
COMPANY, L.L.C.

/s/ T. Darty Smith                           /s/ T. Darty Smith
- ----------------------------------------     -----------------------------------
T. Darty Smith                               T. Darty Smith
Vice President                               Vice President


NALOCO, L.L.C.


/s/ T. Darty Smith
- ----------------------------------------
T. Darty Smith
Vice President





                                       5
<PAGE>   7

Each of the undersigned hereby ratifies and confirms its respective obligations
under the Indenture, as supplemented by this Supplemental Indenture:

EWING BANK GATHERING COMPANY, L.L.C.     GREEN CANYON PIPE LINE COMPANY, L.L.C.

/s/ T. Darty Smith                       /s/ T. Darty Smith
- --------------------------------------   ---------------------------------------
T. Darty Smith                           T. Darty Smith
Vice President                           Vice President


GREEN CANYON PIPE LINE COMPANY, L.L.C.   LEVIATHAN OIL TRANSPORT SYSTEMS, L.L.C.


/s/ T. Darty Smith                       /s/ T. Darty Smith
- --------------------------------------   ---------------------------------------
T. Darty Smith                           T. Darty Smith
Vice President                           Vice President


MANTA RAY GATHERING COMPANY, L.L.C.      DELOS OFFSHORE COMPANY, L.L.C.


/s/ T. Darty Smith                       /s/ T. Darty Smith
- --------------------------------------   ---------------------------------------
T. Darty Smith                           T. Darty Smith
Vice President                           Vice President


FLEXTREND DEVELOPMENT COMPANY, L.L.C.    DELOS OFFSHORE COMPANY, L.L.C.


/s/ T. Darty Smith                       /s/ T. Darty Smith
- --------------------------------------   ---------------------------------------
T. Darty Smith                           T. Darty Smith
Vice President                           Vice President


POSEIDON PIPELINE COMPANY, L.L.C.        STINGRAY HOLDING, L.L.C.


/s/ T. Darty Smith                       /s/ T. Darty Smith
- --------------------------------------   ---------------------------------------
T. Darty Smith                           T. Darty Smith
Vice President                           Vice President


TARPON TRANSMISSION COMPANY              TRANSCO HYDROCARBONS COMPANY, L.L.C.


/s/ T. Darty Smith                       /s/ T. Darty Smith
- --------------------------------------   ---------------------------------------
T. Darty Smith                           T. Darty Smith
Vice President                           Vice President



                                       6
<PAGE>   8

TEXAM OFFSHORE GAS TRANSMISSION,         TRANSCO OFFSHORE PIPELINE COMPANY,
L.L.C.                                   L.L.C.

/s/ T. Darty Smith                       /s/ T. Darty Smith
- --------------------------------------   ---------------------------------------
T. Darty Smith                           T. Darty Smith
Vice President                           Vice President


VK DEEPWATER GATHERING COMPANY, L.L.C.   VK-MAIN PASS GATHERING COMPANY, L.L.C.

/s/ T. Darty Smith                       /s/ T. Darty Smith
- --------------------------------------   ---------------------------------------
T. Darty Smith                           T. Darty Smith
Vice President                           Vice President


SAILFISH PIPELINE COMPANY, L.L.C.


/s/ T. Darty Smith
- --------------------------------------   ---------------------------------------
T. Darty Smith
Vice President




                                       7

<PAGE>   1

                                                                     EXHIBIT 4.3

================================================================================




                      LEVIATHAN GAS PIPELINE PARTNERS, L.P.
                 LEVIATHAN FINANCE CORPORATION, AS THE ISSUERS,

                                       AND

             THE SUBSIDIARIES PARTY HERETO, AS SUBSIDIARY GUARANTORS

                                       AND

              CHASE BANK OF TEXAS, NATIONAL ASSOCIATION, AS TRUSTEE

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

                          SECOND SUPPLEMENTAL INDENTURE

                            DATED AS OF JULY 27, 1999

                                       TO

                                    INDENTURE

                            DATED AS OF MAY 27, 1999

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


                                  $175,000,000

              10 3/8% SENIOR SUBORDINATED NOTES DUE 2009, SERIES A
              10 3/8% SENIOR SUBORDINATED NOTES DUE 2009, SERIES B




================================================================================



<PAGE>   2

                          SECOND SUPPLEMENTAL INDENTURE

         THIS SECOND SUPPLEMENTAL INDENTURE (this "Supplemental Indenture"),
dated as of July 27, 1999, is by and among Leviathan Gas Pipeline Partners,
L.P., a Delaware limited partnership, Leviathan Finance Corporation, a Delaware
corporation, the guarantor parties hereto, and Chase Bank of Texas, National
Association, a national banking association, as trustee.

                              W I T N E S S E T H:

         WHEREAS, the Issuers (herein defined), the Subsidiary Guarantors
(herein defined) and the Trustee (herein defined) entered into an Indenture,
dated as of May 27, 1999 (as in effect on the date hereof, the "Indenture"),
relating to $175,000,000 of the Company's 10 3/8% Senior Subordinated Notes due
2009;

         WHEREAS, the Partnership (herein defined) has formed the Restricted
Subsidiary (herein defined) Moray Pipeline Company, L.L.C. (the "New
Guarantor"), which will become a Subsidiary Guarantor under the Indenture
pursuant to the terms of this Supplemental Indenture.

         WHEREAS, this Supplemental Indenture is executed and delivered pursuant
to Sections 4.14 and 11.01 of the Indenture;

         WHEREAS, the Issuers, the Subsidiary Guarantors (which term includes
the New Guarantor) and the Trustee desire to enter into this Supplemental
Indenture to provide for the New Guarantor's guarantee of the payment of
securities on the same terms and conditions as the Guarantees by the other
Subsidiary Guarantors;

         WHEREAS, all conditions precedent provided for in the Indenture
relating to this Supplemental Indenture have been complied with; and

         NOW, THEREFORE, in consideration of the premises herein contained, and
for other good and valuable considerations, the receipt and sufficiency of which
are hereby acknowledged, the Issuers, the Subsidiary Guarantors and the Trustee
mutually covenant and agree for the equal and proportionate benefit of all
Holders (herein defined) of the Notes (herein defined) as follows:

               SECTION 1. INCORPORATION OF INDENTURE; DEFINITIONS

         1.1 INCORPORATION OF INDENTURE. This Supplemental Indenture constitutes
a supplement to the Indenture, and the Indenture and this Supplemental Indenture
shall be read together and shall have effect so far as practicable as though all
of the provisions thereof and hereof are contained in one instrument.

         1.2 DEFINITIONS. All capitalized terms used herein and not otherwise
defined herein shall have the respective meanings assigned to such terms in the
Indenture.

                                       1


<PAGE>   3

                       SECTION 2. SUPPLEMENTAL PROVISIONS

         2.1 UNCONDITIONAL GUARANTEE. Subject to the provisions of Article 11 of
the Indenture, the New Guarantor shall be a Subsidiary Guarantor under the terms
of the Indenture and each Subsidiary Guarantor hereby, jointly and severally,
unconditionally guarantees to each Holder of a Note authenticated and delivered
by the Trustee and to the Trustee and its successors and assigns, irrespective
of the validity and enforceability of the Indenture, the Notes or the
Obligations of the Issuers under the Indenture or the Notes, that:

         (a)  the principal of, premium, interest and Liquidated Damages, if
              any, on the Notes shall be promptly paid in full when due, whether
              at the maturity or interest payment or mandatory redemption date,
              by acceleration, redemption or otherwise, and interest on the
              overdue principal of, premium, interest and Liquidated Damages, if
              any, on the Notes, if any, if lawful, and all other Obligations of
              the Issuers to the Holders or the Trustee under the Indenture and
              the Notes shall be promptly paid in full or performed, all in
              accordance with the terms of the Indenture and the Notes; and

         (b)  in case of any extension of time of payment or renewal of any
              Notes or any of such other obligations, that same shall be
              promptly paid in full when due or performed in accordance with the
              terms of the extension or renewal, whether at Stated Maturity, by
              acceleration or otherwise. Failing payment when due of any amount
              so guaranteed or any performance so guaranteed for whatever
              reason, the Subsidiary Guarantors shall be jointly and severally
              obligated to pay the same immediately.

The New Guarantor hereby agrees that its obligations hereunder and under the
Indenture shall be unconditional, irrespective of the validity, regularity or
enforceability of the Notes or the Indenture, the absence of any action to
enforce the same, any waiver or consent by any Holder of the Notes with respect
to any provisions of the Indenture and the Notes, the recovery of any judgment
against the Issuers, any action to enforce the same or any other circumstance
which might otherwise constitute a legal or equitable discharge or defense of a
Subsidiary Guarantor. The New Guarantor hereby waives diligence, presentment,
demand of payment, filing of claims with a court in the event of insolvency or
bankruptcy of the Issuers, any right to require a proceeding first against the
Issuers, protest, notice and all demands whatsoever and covenant that the
Guarantees shall not be discharged except by complete performance of the
obligations contained in the Notes and the Indenture.

         If any Holder or the Trustee is required by any court or otherwise to
return to the Issuers or Subsidiary Guarantors, or any custodian, trustee,
liquidator or other similar official acting in relation to either the Issuers or
Subsidiary Guarantors, any amount paid by either to the Trustee or such Holder,
these Guarantees, to the extent theretofore discharged, shall be reinstated in
full force and effect. The New Guarantor agrees that it shall not be entitled to
any right of subrogation in relation to the Holders in respect of any
obligations guaranteed under the Indenture until payment in full of all
obligations guaranteed under the Indenture.

         The New Guarantor further agrees that, as between the Subsidiary
Guarantors, on the one hand, and the Holders and the Trustee, on the other hand,
(x) the maturity of the Obligations guaranteed under the Indenture may be
accelerated as provided in Article 6 of the Indenture for the


                                       2
<PAGE>   4

purposes of these Guarantees, notwithstanding any stay, injunction or other
prohibition preventing such acceleration in respect of the obligations
guaranteed under the Indenture, and (y) in the event of any declaration of
acceleration of such Obligations as provided in Article 6 of the Indenture, such
Obligations (whether or not due and payable) shall forthwith become due and
payable by the Subsidiary Guarantors for the purpose of these Guarantees. The
New Guarantor agrees that the Subsidiary Guarantors shall have the right to seek
contribution from any non-paying Subsidiary Guarantor so long as the exercise of
such right does not impair the rights of the Holders under these Guarantees.

         2.2 OTHER GUARANTEE TERMS. The New Guarantor hereby confirms, adopts
and acknowledges each of the provisions of the Indenture relating to the
Subsidiary Guarantors and the Guarantees, including, but not limited to Articles
4 and 11.

                            SECTION 3. MISCELLANEOUS

         3.1 COUNTERPARTS. This Supplemental Indenture may be signed in
counterparts and by the different parties hereto in separate counterparts, each
of which shall constitute an original and all of which together shall constitute
one and the same instrument.

         3.2 SEVERABILITY. In case any provision in this Supplemental Indenture
shall be invalid, illegal or unenforceable, the validity, legality and
enforceability of the remaining provisions shall not in any way be affected or
impaired thereby.

         3.3 HEADINGS. The headings of the Sections of this Supplemental
Indenture have been inserted for convenience of reference only, are not to be
considered a part hereof and shall not modify or restrict any of the terms or
provisions hereof.

         3.4 SUCCESSORS. All agreements of the Issuers and the Subsidiary
Guarantors in this Supplemental Indenture shall bind their respective
successors. All agreements of the Trustee in this Supplemental Indenture shall
bind its successors.

         3.5 GOVERNING LAW. THIS SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK BUT WITHOUT
GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT
THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY.

         3.6 FULL FORCE AND EFFECT. The Indenture, as supplemented by this
Supplemental Indenture, remains in full force and effect and is hereby ratified
and confirmed as the valid and binding obligation of the parties hereto.


                                       3
<PAGE>   5

         3.7 TRUSTEE. The Trustee accepts the modifications of trusts referenced
in the Indenture and effected by this Supplemental Indenture. Without limiting
the generality of the foregoing, the Trustee assumes no responsibility for the
correctness of the recitals herein contained, which shall be taken as the
statements of the Company and the Subsidiary Guarantors, and the Trustee shall
not be responsible or accountable in any way whatsoever for or with respect to
the validity or execution or sufficiency of this Supplemental Indenture, and the
Trustee makes no representation with respect thereto.






                                       4
<PAGE>   6

         IN WITNESS WHEREOF, the parties hereto have executed this Supplemental
Indenture as of the date first above written.

LEVIATHAN GAS PIPELINE PARTNERS, L.P.      LEVIATHAN FINANCE CORPORATION



/s/ James H. Lytal                         /s/ James H. Lytal
- ----------------------------------------   -------------------------------------
James H. Lytal                             James H. Lytal
President                                  President


CHASE BANK OF TEXAS,
NATIONAL ASSOCIATION, as Trustee


By: /s/ Mauri J. Cowen
   -------------------------------------
Name:   Mauri J. Cowen
     -----------------------------------
Title:  Vice President
      ----------------------------------

NEW GUARANTOR:


MORAY PIPELINE COMPANY, L.L.C.

/s/ James H. Lytal
- ----------------------------------------
James H. Lytal
President







                                       5


<PAGE>   7



Each of the undersigned hereby ratifies and confirms its respective obligations
under the Indenture, as supplemented by this Supplemental Indenture:

EWING BANK GATHERING COMPANY, L.L.C.     GREEN CANYON PIPE LINE COMPANY, L.L.C.


/s/ James H. Lytal                       /s/ James H. Lytal
- ---------------------------------------  ---------------------------------------
James H. Lytal                           James H. Lytal
President                                President


GREEN CANYON PIPE LINE COMPANY, L.L.C.   LEVIATHAN OIL TRANSPORT SYSTEMS, L.L.C.


/s/ James H. Lytal                       /s/ James H. Lytal
- ---------------------------------------  ---------------------------------------
James H. Lytal                           James H. Lytal
President                                President


MANTA RAY GATHERING COMPANY, L.L.C.      DELOS OFFSHORE COMPANY, L.L.C.


/s/ James H. Lytal                       /s/ James H. Lytal
- ---------------------------------------  ---------------------------------------
James H. Lytal                           James H. Lytal
President                                President


FLEXTREND DEVELOPMENT COMPANY, L.L.C.    DELOS OFFSHORE COMPANY, L.L.C.


/s/ James H. Lytal                       /s/ James H. Lytal
- ---------------------------------------  ---------------------------------------
James H. Lytal                           James H. Lytal
President                                President


POSEIDON PIPELINE COMPANY, L.L.C.        STINGRAY HOLDING, L.L.C.


/s/ James H. Lytal                       /s/ James H. Lytal
- ---------------------------------------  ---------------------------------------
James H. Lytal                           James H. Lytal
President                                President


TARPON TRANSMISSION COMPANY              TRANSCO HYDROCARBONS COMPANY, L.L.C.


/s/ James H. Lytal                       /s/ James H. Lytal
- ---------------------------------------  ---------------------------------------
James H. Lytal                           James H. Lytal
President                                President


                                       6

<PAGE>   8

TEXAM OFFSHORE GAS TRANSMISSION,         TRANSCO OFFSHORE PIPELINE COMPANY,
L.L.C.                                   L.L.C.

/s/ James H. Lytal                       /s/ James H. Lytal
- ---------------------------------------  ---------------------------------------
James H. Lytal                           James H. Lytal
President                                President


VK DEEPWATER GATHERING COMPANY, L.L.C.   VK-MAIN PASS GATHERING COMPANY, L.L.C.



/s/ James H. Lytal                       /s/ James H. Lytal
- ---------------------------------------  ---------------------------------------
James H. Lytal                           James H. Lytal
President                                President


SAILFISH PIPELINE COMPANY, L.L.C.        LEVIATHAN OPERATING COMPANY, L.L.C.


/s/ James H. Lytal                       /s/ James H. Lytal
- ---------------------------------------  ---------------------------------------
James H. Lytal                           James H. Lytal
President                                President


UTOS HOLDING, L.L.C.                     NATOCO, L.L.C.


/s/ James H. Lytal                       /s/ James H. Lytal
- ---------------------------------------  ---------------------------------------
James H. Lytal                           James H. Lytal
President                                President





                                       7

<PAGE>   1



                                                                     EXHIBIT 5.1



                     AKIN, GUMP, STRAUSS, HAUER & FELD, L.L.P.
                                 ATTORNEYS AT LAW

                    A REGISTERED LIMITED LIABILITY PARTNERSHIP
                        INCLUDING PROFESSIONAL CORPORATIONS

AUSTIN                      PENNZOIL PLACE-SOUTH TOWER
BRUSSELS                       711 LOUISIANA STREET
DALLAS                              SUITE 1900
HOUSTON                        HOUSTON, TEXAS 77002
LONDON                            (713) 220-5800
LOS ANGELES                     FAX (713) 236-0822
MOSCOW
NEW YORK
PHILADELPHIA
SAN ANTONIO
WASHINGTON, D.C.

                                  June 21, 1999


Securities and Exchange Commission
450 Fifth Street, NW
Washington, DC  20549

Ladies and Gentlemen:

         We have acted as counsel for Leviathan Gas Pipeline Partners, L.P., a
Delaware limited partnership (the "Company") and Leviathan Finance Corporation
(together with the Company, the "Issuers"), in connection with the proposed
offer by the Issuers to exchange (the "Exchange Offer") all outstanding 10?%
Series A Senior Subordinated Notes Due 2009 ($175 million aggregate principal
amount outstanding) (the "Outstanding Notes") of the Company for 10?% Series B
Senior Subordinated Notes Due 2009 ($175 million aggregate principal amount)
(the "Registered Notes") of the Issuers. The Outstanding Notes have been, and
the Registered Notes will be, issued pursuant to an Indenture, dated as of May
27, 1999 (the "Indenture"), among the Issuers, the Subsidiary Guarantors named
therein, and Chase Bank of Texas, N.A., as trustee (the "Trustee").

         In connection with such matters we have examined the Indenture, the
registration statement on Form S-4 (No. 333-81143) the Issuers filed with the
Securities and Exchange Commission (the "SEC") dated June 21, 1999, for the
registration of the Registered Notes (the registration statement, as amended, at
the time it becomes effective being referred to as the "Registration Statement")
under the Securities Act of 1933, as amended (the "Securities Act"), and such
records of the Issuers, certificates of public officials and such other
documents as we have deemed necessary or appropriate for the purpose of this
opinion.

         Based upon the foregoing, subject to qualifications hereinafter set
forth, and having regard for such legal considerations as we deem relevant, we
are of the opinion that the Registered Notes proposed to be issued pursuant to
the Exchange Offer (i) have been duly authorized for issuance and (ii) subject
to the Registration Statement becoming effective under the Securities Act, and
to compliance with any applicable state securities laws, when issued and
delivered will be legally binding obligations of the Issuers enforceable against
the Issuers in accordance with their terms.



<PAGE>   2

         The opinions expressed herein are subject to the following: the
enforceability of the Registered Notes may be limited or affected by (i)
bankruptcy, insolvency, reorganization, moratorium, liquidation, rearrangement,
fraudulent transfer, fraudulent conveyance and other similar laws (including
court decisions) now or hereinafter in effect and affecting the rights and
remedies of creditors generally or providing for the relief of debtors, (ii) the
refusal of a particular court to grant equitable remedies, including, without
limitation, specific performance and injunctive relief, and (iii) general
principles of equity (regardless of whether such remedies are sought in a
proceeding in equity or at law).

         The opinions expressed herein are limited exclusively to the laws of
the State of New York and the State of Delaware.

         We hereby consent to the filing of this opinion as an Exhibit to the
Registration Statement and to the reference to Akin, Gump, Strauss, Hauer &
Feld, L.L.P. under "Legal Matters" in the Prospectus forming a part of the
Registration Statement. In giving this consent, we do not thereby admit that we
are within the category of persons whose consent is required under Section 7 of
the Securities Act and the rules and regulations of the SEC thereunder.



                               Very truly yours,




                               /s/ AKIN, GUMP, STRAUSS, HAUER & FELD, L.L.P.




<PAGE>   1
                                                                   EXHIBIT 10.14

                                                                  EXECUTION COPY

================================================================================



                           THIRD AMENDED AND RESTATED
                                CREDIT AGREEMENT

                                      among

                     LEVIATHAN GAS PIPELINE PARTNERS, L.P.,

                         LEVIATHAN FINANCE CORPORATION,


                               The Several Lenders
                        from Time to Time Parties Hereto,

                                CREDIT LYONNAIS,
                              as Syndication Agent

                                BANKBOSTON, N.A.
                             as Documentation Agent

                                       and

                            THE CHASE MANHATTAN BANK,
                             as Administrative Agent

                           Dated as of March 23, 1995,
                             as amended and restated
                              through May 27, 1999


================================================================================


                     CHASE SECURITIES INC., as Lead Arranger
                                and Book Manager


<PAGE>   2




                                TABLE OF CONTENTS



<TABLE>
<CAPTION>
                                                                                                               Page
                                                                                                               ----
<S>         <C>                                                                                                <C>
SECTION 1.  DEFINITIONS...........................................................................................1
        1.1  Defined Terms........................................................................................1
        1.2  Other Definitional Provisions.......................................................................22

SECTION 2.  AMOUNT AND TERMS OF REVOLVING CREDIT COMMITMENTS.....................................................22
        2.1  Revolving Credit Commitments........................................................................22
        2.2  Repayment of Loans; Evidence of Debt................................................................22
        2.3  Procedure for Revolving Credit Borrowing............................................................23
        2.4  Limitations on Revolving Credit Loans...............................................................24
        2.5  Commitment Fee......................................................................................24
        2.6  Termination or Reduction of Revolving Credit Commitments............................................24
        2.7  Extensions of Revolving Credit Termination Date.....................................................25

SECTION 3.  LETTERS OF CREDIT....................................................................................25
        3.1  Issuance of Letters of Credit.......................................................................25
        3.2  Procedure for Issuance of Letters of Credit.........................................................26
        3.3  Participations and Payments in Respect of the Letters of Credit.....................................26
        3.4  Fees, Commissions and Other Charges.................................................................27
        3.5  Reimbursement Obligation of the Borrower............................................................28
        3.6  Obligations Absolute................................................................................28
        3.7  Letter of Credit Payments...........................................................................29
        3.8  Applications........................................................................................29

SECTION 4.  GENERAL PROVISIONS...................................................................................29
        4.1  Optional and Mandatory Prepayments..................................................................29
        4.2  Conversion and Continuation Options.................................................................30
        4.3  Minimum Amounts of Tranches.........................................................................30
        4.4  Interest Rates and Payment Dates....................................................................31
        4.5  Computation of Interest and Fees....................................................................31
        4.6  Inability to Determine Interest Rate................................................................31
        4.7  Pro Rata Treatment and Payments.....................................................................32
        4.8  Illegality..........................................................................................33
        4.9  Requirements of Law.................................................................................33
        4.10  Taxes..............................................................................................34
        4.11  Indemnity..........................................................................................35
        4.12  Lenders Obligation to Mitigate.....................................................................36
        4.13  Certain Permitted Transactions.....................................................................36
        4.14  Certain Adjustments................................................................................37
</TABLE>



<PAGE>   3



<TABLE>
<S>         <C>                                                                                                <C>
        4.15  Redesignated Senior Indebtedness...................................................................37

SECTION 5.  REPRESENTATIONS AND WARRANTIES.......................................................................37
        5.1  Financial Condition.................................................................................37
        5.2  No Change...........................................................................................38
        5.3  Existence; Compliance with Law......................................................................38
        5.4  Power; Authorization; Enforceable Obligations.......................................................38
        5.5  No Legal Bar........................................................................................39
        5.6  No Material Litigation..............................................................................39
        5.7  No Default..........................................................................................40
        5.8  Ownership of Property; Liens........................................................................40
        5.9  Intellectual Property...............................................................................40
        5.10  No Burdensome Restrictions.........................................................................40
        5.11  Taxes..............................................................................................40
        5.12  Federal Regulations................................................................................40
        5.13  ERISA..............................................................................................41
        5.14  Investment Company Act; Other Regulations..........................................................41
        5.15  Subsidiaries.......................................................................................41
        5.16  Purpose of Revolving Credit Loans, Letters of Credit...............................................41
        5.17  Environmental Matters..............................................................................41
        5.18  Accuracy and Completeness of Information...........................................................42
        5.19  Security Documents.................................................................................43
        5.20  Joint Venture Charters, Management Agreement, etc. ................................................43
        5.21  Senior Indebtedness................................................................................44
        5.22  Year 2000 Matters..................................................................................44

SECTION 6.  CONDITIONS PRECEDENT.................................................................................44
        6.1  Conditions to Initial Extensions of Credit..........................................................44
        6.2  Conditions to Each Extension of Credit..............................................................49

SECTION 7.  AFFIRMATIVE COVENANTS................................................................................50
        7.1  Financial Statements................................................................................50
        7.2  Certificates; Other Information.....................................................................51
        7.3  Payment of Obligations..............................................................................53
        7.4  Conduct of Business and Maintenance of Existence....................................................53
        7.5  Maintenance of Property; Insurance..................................................................53
        7.6  Inspection of Property; Books and Records; Discussions..............................................54
        7.7  Notices.............................................................................................54
        7.8  Environmental Laws..................................................................................54
        7.9  Maintenance of Liens of the Security Documents......................................................55
        7.10  Pledge of After-Acquired Property..................................................................55
        7.11  Agreements Respecting Unrestricted Subsidiaries....................................................56
        7.12  Commodity Hedging Programs.........................................................................57
        7.13  Joint Venture Charters, Management Agreement, etc. ................................................57
</TABLE>



<PAGE>   4




<TABLE>
<S>         <C>                                                                                                 <C>
SECTION 8.  NEGATIVE COVENANTS...................................................................................57
        8.1  Financial Condition Covenants.......................................................................57
        8.2  Limitation on Indebtedness..........................................................................57
        8.3  Limitation on Liens.................................................................................58
        8.4  Limitation on Guarantee Obligations.................................................................59
        8.5  Limitations on Fundamental Changes..................................................................60
        8.6  Limitation on Sale of Assets........................................................................60
        8.7  Limitation on Dividends.............................................................................61
        8.8  Limitation on Investments, Loans and Advances.......................................................61
        8.9  Limitation on Optional Payments and Modifications of Debt Instruments and Other
              Agreements.........................................................................................62
        8.10  Limitation on Transactions with Affiliates.........................................................63
        8.11  Limitation on Sales and Leasebacks.................................................................63
        8.12  Limitation on Changes in Fiscal Year...............................................................63
        8.13  Limitation on Lines of Business....................................................................63
        8.14  Corporate Documents................................................................................63
        8.15  Compliance with ERISA..............................................................................63
        8.16  Limitation on Restrictions Affecting Subsidiaries..................................................63
        8.17  Creation of Restricted Subsidiaries................................................................64
        8.18  Hazardous Materials................................................................................64
        8.19  Holding Companies..................................................................................64
        8.20  No Voluntary Termination of Joint Venture Charters.................................................65
        8.21  Actions by Joint Ventures..........................................................................65
        8.22  Hedging Transactions...............................................................................65

SECTION 9.  EVENTS OF DEFAULT....................................................................................65

SECTION 10.  THE ADMINISTRATIVE AGENT............................................................................69
        10.1  Appointment........................................................................................69
        10.2  Delegation of Duties...............................................................................69
        10.3  Exculpatory Provisions.............................................................................69
        10.4  Reliance by Administrative Agent...................................................................70
        10.5  Notice of Default..................................................................................70
        10.6  Non-Reliance on Administrative Agent and Other Lenders.............................................70
        10.7  Indemnification....................................................................................71
        10.8  Administrative Agent in Its Individual Capacity....................................................71
        10.9  Successor Administrative Agent.....................................................................71
        10.10  Other Agents......................................................................................72

SECTION 11.  MISCELLANEOUS.......................................................................................72
        11.1  Amendments and Waivers.............................................................................72
        11.2  Notices............................................................................................73
        11.3  No Waiver; Cumulative Remedies.....................................................................74
        11.4  Survival of Representations and Warranties.........................................................74
        11.5  Payment of Expenses and Taxes......................................................................74
        11.6  Successors and Assigns; Participations; Purchasing Lenders.........................................75
        11.7  Adjustments; Set-off...............................................................................77
</TABLE>



<PAGE>   5



<TABLE>
<S>           <C>                                                                                                <C>
        11.8  Counterparts.......................................................................................78
        11.9  Severability.......................................................................................78
        11.10  Integration.......................................................................................78
        11.11  Usury Savings Clause..............................................................................78
        11.12  GOVERNING LAW.....................................................................................79
        11.13  Submission To Jurisdiction; Waivers...............................................................79
        11.14  Acknowledgements..................................................................................80
        11.15  Confidentiality...................................................................................80
        11.16  WAIVERS OF JURY TRIAL.............................................................................80
        11.17  ACKNOWLEDGEMENT OF NO CLAIMS, OFFSETS OR DEFENSES;
               RELEASE BY THE LOAN PARTIES.......................................................................81
        11.18  Releases..........................................................................................81
        11.19  Co-Borrower's Obligations.........................................................................82
</TABLE>


Schedules


Schedule I      Lenders, Commitments and Commitment Percentages
Schedule 5.1    Guarantee Obligations, Contingent Liabilities and Dispositions
Schedule 5.6    Litigation
Schedule 5.15   Subsidiaries and Joint Ventures
Schedule 5.17   Environmental Matters


Exhibits

Exhibit A       Form of Revolving Credit Note
Exhibit B       Form of Guarantee and Security Documents Confirmation
Exhibit C       Form of Borrower Pledge Agreement
Exhibit D       Form of Borrower Security Agreement
Exhibit E       Form of Leviathan Guarantee
Exhibit F       Form of Leviathan Pledge Agreement (Limited Liability Companies)
Exhibit G       Form of Leviathan Pledge Agreement (General Partner Interest)
Exhibit H       Form of Leviathan Security Agreement (Management Agreement)
Exhibit I       [Reserved]
Exhibit J       Form of Subsidiaries Guarantee
Exhibit K       Form of Subsidiary Security Agreement
Exhibit L       Form of Borrowing Certificate
Exhibit M       Form of Assignment and Acceptance
Exhibit N       Form of Environmental Compliance Certificate



<PAGE>   6



                  THIRD AMENDED AND RESTATED CREDIT AGREEMENT, dated as of March
23, 1995, as amended and restated through May 27, 1999 (this "Agreement"), among
LEVIATHAN GAS PIPELINE PARTNERS, L.P., a Delaware limited partnership (the
"Borrower"), LEVIATHAN FINANCE CORPORATION, a Delaware corporation (the
"Co-Borrower"), the several banks and other financial institutions from time to
time parties to this Agreement (the "Lenders"), CREDIT LYONNAIS, as syndication
agent for the Lenders hereunder (in such capacity, the "Syndication Agent"),
BANKBOSTON, N.A., as documentation agent for the Lenders hereunder (in such
capacity, the "Documentation Agent"), and THE CHASE MANHATTAN BANK, a New York
banking corporation, as administrative agent for the Lenders hereunder (in such
capacity, the "Administrative Agent").


                              W I T N E S S E T H :


                  WHEREAS, the Borrower, certain of the Lenders, the
Administrative Agent and ING (U.S.) Capital Corporation, as co-arranger, are
parties to the Amended and Restated Credit Agreement, dated as of March 23,
1995, as amended and restated through December 20, 1996 (and as further amended
prior to the date hereof, the "Existing Credit Agreement");

                  WHEREAS, the Borrower has requested that the Existing Credit
Agreement be amended and restated (a) to provide for additional financial
institutions as lenders (the "New Lenders"), (b) to extend the Revolving Credit
Termination Date, (c) to amend certain covenants, (d) to add the Co-Borrower as
a co-borrower under this Agreement on a joint and several basis with the
Borrower, and (e) otherwise to amend the Existing Credit Agreement and restate
it in its entirety as more fully set forth herein;

                  WHEREAS, the Lenders and the Administrative Agent are willing
to so amend and restate the Existing Credit Agreement, and the New Lenders are
willing to become parties hereto, but only on the terms and subject to the
conditions set forth herein;

                  NOW, THEREFORE, in consideration of the premises and the
mutual covenants contained herein, the parties hereto hereby agree that on the
Closing Date (as hereinafter defined) the Existing Credit Agreement shall be
amended and restated in its entirety as follows:


                             SECTION 1. DEFINITIONS

                  1.1 Defined Terms. As used in this Agreement, the following
terms shall have the following meanings:

                  "Acquired Business":  as defined in subsection 8.8(e).

                  "Administrative Agent": as defined in the introductory
         paragraph of this Agreement.




<PAGE>   7

                                                                               2

                  "Affiliate": as to any Person, any other Person (other than a
         Subsidiary) which, directly or indirectly, is in control of, is
         controlled by, or is under common control with, such Person. For
         purposes of this definition, "control" of a Person means the power,
         directly or indirectly, either to (i) vote 10% or more of the
         securities having ordinary voting power for the election of directors
         of such Person or (ii) direct or cause the direction of the management
         and policies of such Person, whether by contract or otherwise;
         provided, that any third Person which also beneficially owns 10% or
         more of the securities having ordinary voting power for the election of
         directors (or similar authority) of a Joint Venture or Subsidiary shall
         not be deemed to be an affiliate of the Borrower and its Subsidiaries
         or Joint Ventures merely because of such common ownership..

                  "Aggregate Outstanding Revolving Credit Extensions of Credit":
         as to any Lender at any time, an amount equal to the sum of (a) the
         aggregate principal amount of all Revolving Credit Loans made by such
         Lender then outstanding and (b) such Lender's Commitment Percentage of
         the L/C Obligations then outstanding.

                  "Agreement": the Existing Credit Agreement, as amended and
         restated by this Agreement, as further amended, supplemented or
         otherwise modified from time to time.

                  "Alternate Base Rate": for any day, a rate per annum (rounded
         upwards, if necessary, to the next 1/16 of 1%) equal to the greatest of
         (a) the Prime Rate in effect on such day, (b) the Base CD Rate in
         effect on such day plus 1% and (c) the Federal Funds Effective Rate in
         effect on such day plus 1/2 of 1%. For purposes hereof: "Prime Rate"
         shall mean the rate of interest per annum publicly announced from time
         to time by the Administrative Agent as its prime rate in effect at its
         principal office in New York City (each change in the Prime Rate to be
         effective on the date such change is publicly announced); "Base CD
         Rate" shall mean the sum of (a) the product of (i) the Three-Month
         Secondary CD Rate and (ii) a fraction, the numerator of which is one
         and the denominator of which is one minus the C/D Reserve Percentage
         and (b) the C/D Assessment Rate; "Three-Month Secondary CD Rate" shall
         mean, for any day, the secondary market rate for three-month
         certificates of deposit reported as being in effect on such day (or, if
         such day shall not be a Business Day, the next preceding Business Day)
         by the Board of Governors of the Federal Reserve System (the "Board")
         through the public information telephone line of the Federal Reserve
         Bank of New York (which rate will, under the current practices of the
         Board, be published in Federal Reserve Statistical Release H.15(519)
         during the week following such day), or, if such rate shall not be so
         reported on such day or such next preceding Business Day, the average
         of the secondary market quotations for three-month certificates of
         deposit of major money center banks in New York City received at
         approximately 10:00 A.M., New York City time, on such day (or, if such
         day shall not be a Business Day, on the next preceding Business Day) by
         the Administrative Agent from three New York City negotiable
         certificate of deposit dealers of recognized standing selected by it;
         "C/D Assessment Rate" means for any day as applied to any Revolving
         Credit Loan, the net annual assessment rate (rounded upward to the
         nearest 1/100th of 1%) determined by Chase to be payable on such day to
         the Federal Deposit Insurance Corporation or any successor ("FDIC") for
         FDIC's insuring time deposits made in Dollars at offices of Chase in
         the United States; and "Federal Funds



<PAGE>   8


                                                                               3

         Effective Rate" shall mean, for any day, the weighted average of the
         rates on overnight federal funds transactions with members of the
         Federal Reserve System arranged by federal funds brokers, as published
         on the next succeeding Business Day by the Federal Reserve Bank of New
         York, or, if such rate is not so published for any day which is a
         Business Day, the average of the quotations for the day of such
         transactions received by the Administrative Agent from three federal
         funds brokers of recognized standing selected by it. If for any reason
         the Administrative Agent shall have determined (which determination
         shall be conclusive absent manifest error) that it is unable to
         ascertain the Base CD Rate or the Federal Funds Effective Rate, or
         both, for any reason, including the inability or failure of the
         Administrative Agent to obtain sufficient quotations in accordance with
         the terms thereof, the Alternate Base Rate shall be determined without
         regard to clause (b) or (c), or both, of the first sentence of this
         definition, as appropriate, until the circumstances giving rise to such
         inability no longer exist. Any change in the Alternate Base Rate due to
         a change in the Prime Rate, the Three-Month Secondary CD Rate or the
         Federal Funds Effective Rate shall be effective on the effective day of
         such change in the Prime Rate, the Three-Month Secondary CD Rate or the
         Federal Funds Effective Rate, respectively.

                  "Alternate Base Rate Loans": Revolving Credit Loans the rate
         of interest applicable to which is based upon the Alternate Base Rate.

                  "Applicable Margin": for each Type of Revolving Credit Loan,
         the Commitment Fee payable pursuant to subsection 2.5(a) and the
         Incremental Commitment Fee payable pursuant to subsection 2.5(b) at any
         time, the rate per annum based on the ratio of Consolidated Total
         Indebtedness of the Borrower at such time to Consolidated EBITDA for
         the most recently ended Calculation Period (the "Leverage Ratio") as
         set forth under the relevant column heading below:


<TABLE>
<CAPTION>
                                             Alternate                   Incremental
                               Eurodollar      Base        Commitment    Commitment
Leverage Ratio                   Loans       Rate Loans       Fee            Fee
- ----------------------------   ----------    ----------    ----------    ----------
<S>                            <C>           <C>           <C>          <C>
Less than or equal to 2.0            1.50%         0.50%         .300%        .1500%
Greater than 2.0 but less            1.75%         0.75%         .375%        .1875%
than or equal to 3.0
Greater than 3.0 but less            2.25%         1.25%         .500%        .2500%
than 4.0
Greater than or equal to 4.0         2.50%         1.50%         .500%        .2500%
</TABLE>

         The Applicable Margin, Commitment Fee and Incremental Commitment Fee
         for any date shall be determined by reference to the Leverage Ratio as
         of the last day of the fiscal quarter most recently ended as of such
         date and for the Calculation Period ended on such last day, and any
         change (x) shall become effective upon the delivery to the
         Administrative Agent of a certificate of a Responsible Officer of the
         Borrower (which



<PAGE>   9


                                                                               4

         certificate may be delivered prior to delivery of the relevant
         financial statements or may be incorporated in the certificate
         delivered pursuant to subsection 7.2(b)) with respect to the financial
         statements to be delivered pursuant to subsection 7.1 for the most
         recently ended fiscal quarter (a) setting forth in reasonable detail
         the calculation of the Leverage Ratio at the end of such fiscal quarter
         and (b) stating that the signer has reviewed the terms of this
         Agreement and other Loan Documents and has made, or caused to be made
         under his or her supervision, a review in reasonable detail of the
         transactions and condition of the Borrower and the Restricted
         Subsidiaries during the accounting period, and that the signer does not
         have knowledge of the existence as at the date of such officers'
         certificate of any Event of Default or Default, and (y) shall apply (i)
         in the case of the Alternate Base Rate Loans, to Alternate Base Rate
         Loans outstanding on such delivery date or made on and after such
         delivery date and (ii) in the case of the Eurodollar Loans, to
         Eurodollar Loans made on and after such delivery date. It is understood
         that the foregoing certificate of a Responsible Officer shall be
         permitted to be delivered prior to, but in no event later than, the
         time of the actual delivery of the financial statements required to be
         delivered pursuant to subsection 7.1. Notwithstanding the foregoing, at
         any time prior to which the first certificate is required to be
         delivered under subsection 7.2(b) (or prior to the time a certificate
         as described in this definition is first delivered to the
         Administrative Agent) and at any time during which the Borrower has
         failed to deliver the certificate required under subsection 7.2(b) with
         respect to a fiscal quarter following the date the delivery thereof is
         due, the Leverage Ratio shall be deemed, solely for the purposes of
         this definition, to be greater than 4.0 until such time as Borrower
         shall deliver such compliance certificate.

                  "Application": an application, in such form as the Issuing
         Bank may specify, requesting the Issuing Bank to open a Letter of
         Credit.

                  "Available Revolving Credit Commitment": as to any Lender at
         any time, an amount equal to the excess, if any, of (a) the amount of
         such Lender's Revolving Credit Commitment over (b) such Lender's
         Aggregate Outstanding Revolving Credit Extensions of Credit.

                  "Borrower": as defined in the introductory paragraph of this
         Agreement.

                  "Borrower Pledge Agreement": the Amended and Restated Pledge
         and Security Agreement made by the Borrower in favor of the
         Administrative Agent for the benefit of the Lenders, substantially in
         the form of Exhibit C hereto, as the same may be amended, supplemented
         or otherwise modified from time to time.

                  "Borrower Security Agreement": the Amended and Restated
         Security Agreement made by the Borrower in favor of the Administrative
         Agent for the benefit of the Lenders, substantially in the form of
         Exhibit D hereto, as the same may be amended, supplemented or otherwise
         modified from time to time.

                  "Borrowing Date": any Business Day specified in a notice
         pursuant to subsection 2.3 or 3.2 as a date on which the Borrower
         requests the Lenders to make Loans or the Issuing Bank to issue a
         Letter of Credit hereunder.



<PAGE>   10


                                                                               5

                  "Business": as defined in subsection 5.17.

                  "Business Day": a day other than a Saturday, Sunday or other
         day on which commercial banks in New York City are authorized or
         required by law to close.

                  "Calculation Period": each period of four consecutive fiscal
         quarters of the Borrower.

                  "Capital Lease": any lease of property, real or personal, the
         obligations of the lessee in respect of which are required in
         accordance with GAAP to be capitalized on a balance sheet of the
         lessee.

                  "Capital Stock": any and all shares, interests, participations
         or other equivalents (however designated) of capital stock of a
         corporation, any and all equivalent ownership interests in a Person
         (other than a corporation) and any and all warrants or options to
         purchase any of the foregoing. In addition, with respect to the
         Borrower, "Capital Stock" shall include the Preference Units, the
         Common Units and the General Partnership Interest.

                  "Cash Equivalents": (i) marketable direct obligations issued
         or unconditionally guaranteed by the United States Government or issued
         by any agency thereof and backed by the full faith and credit of the
         United States, in each case maturing within one year from the date of
         acquisition thereof; (ii) marketable direct obligations issued by any
         state of the United States of America or any political subdivision of
         any such state or any public instrumentality thereof maturing within
         one year from the date of acquisition thereof and, at the time of
         acquisition, having the highest rating obtainable from either Standard
         & Poor's Ratings Services (or any successor statistical rating
         organization) ("S&P"), or Moody's Investors Service, Inc. (or any
         successor statistical rating organization) ("Moody's"); (iii)
         commercial paper maturing no more than one year from the date of
         creation thereof and, at the time of acquisition, having the highest
         rating obtainable from either S&P or Moody's; (iv) certificates of
         deposit or banker's acceptances maturing within one year from the date
         of acquisition thereof issued by (x) any Lender, (y) any commercial
         bank organized under the laws of the United States of America or any
         state thereof or the District of Columbia having combined capital and
         surplus of not less than $250,000,000 or (z) any bank which has a
         short-term commercial paper rating meeting the requirements of clause
         (iii) above (any such Lender or bank, a "Qualifying Lender"); (v)
         eurodollar time deposits having a maturity of less than one year
         purchased directly from any Lender (whether such deposit is with such
         Lender or any other Lender hereunder) or issued by any Qualifying
         Lender; and (vi) repurchase agreements and reverse repurchase
         agreements with a term of not more than 14 days with any Qualifying
         Lender relating to marketable direct obligations issued or
         unconditionally guaranteed by the United States.

                  "C/D Reserve Percentage": for any day as applied to any
         Alternate Base Rate Loan, that percentage (expressed as a decimal)
         which is in effect on such day, as prescribed by the Board of Governors
         of the Federal Reserve System (or any successor) (the "Board"), for
         determining the maximum reserve requirement for a Depositary



<PAGE>   11


                                                                               6

         Institution (as defined in Regulation D of the Board) in respect of new
         non-personal time deposits in Dollars having a maturity of 30 days or
         more.

                  "Change in Control": (a) the acquisition by any Person or two
         or more Persons acting in concert (other than the management of El Paso
         Energy as of the Closing Date and the shareholders of El Paso Energy as
         of the Closing Date) of beneficial ownership (within the meaning of
         Rule 13d-3, promulgated by the Securities and Exchange Commission and
         now in effect under the Securities Exchange Act of 1934, as amended) of
         50% or more of the issued and outstanding shares of voting stock of El
         Paso Energy; (b) the occurrence of a "change in control" under the
         Senior Subordinated Note Indenture; or (c) the occurrence of any of the
         following:

                           (1) the sale, transfer, lease, conveyance or other
                  disposition (other than by way of merger or consolidation), in
                  one or a series of related transactions, of all or
                  substantially all of the assets of Borrower and its Restricted
                  Subsidiaries taken as a whole to any "person" (as such term is
                  used in Section 13(d)(3) of the Securities Exchange Act of
                  1934, as amended) other than the El Paso Energy Group;

                           (2) the adoption of a plan relating to the
                  liquidation or dissolution of the Borrower or the General
                  Partner;

                           (3) such time as the El Paso Energy Group ceases to
                  own, directly or indirectly, all of the general partner
                  interests of the Borrower or members of the El Paso Energy
                  Group cease to serve as the only general partners of the
                  Borrower; or

                           (4) such time as the El Paso Energy Group ceases to
                  own a limited partnership interest in the Borrower
                  representing at least 10% of all general, limited, common and
                  other interests in the Borrower; or

                           (5) all of the general partner interests of the
                  Borrower are not pledged to the Lenders pursuant to the Loan
                  Documents.

                  Notwithstanding the foregoing, a conversion of the Borrower
         from a limited partnership to a corporation, limited liability company
         or other form of entity or an exchange of all of the outstanding
         limited partnership interests for Capital Stock in a corporation, for
         member interests in a limited liability company or for any other equity
         interests in such other form of entity shall not constitute a Change of
         Control, so long as following such conversion or exchange the El Paso
         Energy Group beneficially owns, directly or indirectly, in the
         aggregate more than 50% of the securities having ordinary voting power
         for the election of directors of such entity, or any combination
         thereof, and continues to own a sufficient number of the outstanding
         voting securities of such entity to elect a majority of its directors,
         managers, trustees or other persons serving in a similar capacity for
         such entity.

                  "Chase":  The Chase Manhattan Bank.




<PAGE>   12


                                                                               7

                  "Closing Date": the date on which the conditions set forth in
         subsection 6.1 are first satisfied or waived, which shall occur on or
         prior to May 28, 1999.

                  "Co-Borrower": as defined in the introductory paragraph to
         this Agreement.

                  "Code": the Internal Revenue Code of 1986, as amended from
         time to time.

                  "Collateral": the "Collateral" as defined in the several
         Security Documents.

                  "Commitment Fee": the commitment fee payable pursuant to
         subsection 2.5(a).

                  "Commitment Percentage": as to any Lender at any time, with
         respect to any credit to be extended under, payment or prepayment to be
         made under, conversion or continuation under, participation in a Letter
         of Credit issued under, or other matter with respect to, the Revolving
         Credit Commitments, a percentage, the numerator of which is such
         Lender's Revolving Credit Commitment and the denominator of which is
         the aggregate Revolving Credit Commitments then in effect (or, if the
         Revolving Credit Commitments have been terminated, as to any Lender at
         any time, a percentage, the numerator of which is such Lender's
         Aggregate Outstanding Revolving Extensions of Credit and the
         denominator of which is the Aggregate Outstanding Revolving Extensions
         of Credit of all Lenders at such time).

                  "Commodity Hedging Program: any hedge agreement designed to
         protect the Borrower or any of its Subsidiaries against fluctuations in
         Petroleum prices.

                  "Common Unit": a partnership interest of a limited partner of
         the Borrower representing a fractional part of the partnership
         interests of all limited partners of the Borrower and having the rights
         and obligations specified with respect to Common Units in the
         Partnership Agreement.

                  "Commonly Controlled Entity": an entity, whether or not
         incorporated, which is under common control with the Borrower within
         the meaning of Section 4001 of ERISA or is part of a group which
         includes the Borrower and which is treated as a single employer under
         Section 414 of the Code.

                  "Consolidated EBITDA": for any period and in accordance with
         subsection 4.14, the Consolidated Net Income ((i) including earnings
         and losses from discontinued operations, except to the extent that any
         such losses represent reserves for losses attributable to the planned
         disposition of material assets, (ii) excluding extraordinary gains, and
         gains and losses arising from the sale of material assets, and (iii)
         including other non-recurring losses) for such period, plus (x) the
         aggregate amount of cash distributions received by the Borrower and its
         consolidated Subsidiaries (excluding Unrestricted Subsidiaries and
         Joint Ventures) from Unrestricted Subsidiaries and Joint Ventures, and
         (y) to the extent reflected as a charge in the statement of
         Consolidated Net Income for such period, the sum of (a) interest
         expense, amortization of debt discount and debt issuance costs
         (including the write-off of such costs in connection with prepayments
         of debt) and commissions, discounts and other fees and charges
         associated with standby



<PAGE>   13


                                                                               8

         letters of credit, (b) taxes measured by income accrued as an expense
         during such period, (c) depreciation, depletion, and amortization
         expense, and (d) non-cash compensation expense resulting from the
         accounting treatment applied, in accordance with GAAP, to management's
         equity interest minus the equity of the Borrower and its consolidated
         Subsidiaries (excluding Unrestricted Subsidiaries and Joint Ventures)
         in the earnings of Unrestricted Subsidiaries and Joint Ventures.

                  "Consolidated Interest Expense": for any period, and in
         accordance with subsection 4.14, total cash interest expense (including
         that attributable to Capital Leases) of the Borrower and its
         Subsidiaries (excluding Unrestricted Subsidiaries and Joint Ventures)
         for such period with respect to all outstanding Indebtedness of the
         Borrower and such Subsidiaries (including all commissions, discounts
         and other fees and charges owed with respect to letters of credit and
         bankers' acceptance financing and net costs under Hedge Agreements in
         respect of interest rates to the extent such net costs are allocable to
         such period in accordance with GAAP).

                  "Consolidated Net Income": for any period, and in accordance
         with subsection 4.14, the net income or net loss of the Borrower and
         its consolidated Subsidiaries (excluding Unrestricted Subsidiaries and
         Joint Ventures) for such period determined in accordance with GAAP on a
         consolidated basis.

                  "Consolidated Net Worth": as of the date of determination, all
         items which in conformity with GAAP would be included under
         shareholders' equity on a consolidated balance sheet of the Borrower
         and its consolidated Subsidiaries (excluding Unrestricted Subsidiaries)
         at such date.

                  "Consolidated Tangible Net Worth": as of the date of
         determination, Consolidated Net Worth after deducting therefrom the
         following:

                  (a) goodwill, including any amounts (however designated on the
         balance sheet) representing the cost of acquisitions of Subsidiaries in
         excess of underlying tangible assets;

                  (b) patents, trademarks, copyrights;

                  (c) leasehold improvements not recoverable at the expiration
         of a lease; and

                  (d) deferred charges (including, but not limited to,
         unamortized debt discount and expense, organization expenses and
         experimental and development expenses, but excluding prepaid expenses).

                  "Consolidated Total Indebtedness": at any time, all
         Indebtedness of the Borrower and its consolidated Subsidiaries
         (excluding Unrestricted Subsidiaries) at such time.

                  "Consolidated Total Senior Indebtedness": at any time,
         Consolidated Total Indebtedness less the aggregate outstanding
         principal amount of the Senior Subordinated Notes at such time.



<PAGE>   14


                                                                               9

                  "Contractual Obligation": as to any Person, any provision of
         any security issued by such Person or of any agreement, instrument or
         other undertaking to which such Person is a party or by which it or any
         of its property is bound.

                  "Default": any of the events specified in Section 9, whether
         or not any requirement for the giving of notice, the lapse of time, or
         both, or any other condition, has been satisfied.

                  "Delos": Delos Offshore Company, L.L.C., a Delaware limited
         liability company.

                  "Documents": as defined in subsection 5.20(b).

                  "Dollars" and "$": dollars in lawful currency of the United
         States of America.

                  "East Breaks": East Breaks Gathering Company, L.L.C., a
         Delaware limited liability company.

                  "Environmental Laws": any and all foreign, Federal, state,
         local or municipal laws, rules, orders, regulations, statutes,
         ordinances, codes, decrees, requirements of any Governmental Authority
         or other Requirements of Law (including common law) regulating,
         relating to or imposing liability or standards of conduct concerning
         protection of human health or the environment or to emissions,
         discharges, releases or threatened releases of pollutants,
         contaminants, chemicals, or industrial, toxic or hazardous substances
         or wastes into the environment including, without limitation, ambient
         air, surface water, ground water, or land, or otherwise relating to the
         manufacture, processing, distribution, use, treatment, storage,
         disposal, transport, or handling of pollutants, contaminants,
         chemicals, or industrial, toxic or hazardous substances or wastes, as
         now or may at any time hereafter be in effect.

                  "El Paso Energy": El Paso Energy Corporation, a Delaware
         corporation.

                  "El Paso Energy Group": collectively, (1) El Paso Energy, and
         (2) each Person which is a direct or indirect Subsidiary of El Paso
         Energy.

                  "Equity Adjustment Date": the date on which an Equity
         Adjustment Event occurs.

                  "Equity Adjustment Event": the receipt by the Borrower of at
         least $75,000,000 in Net Equity Proceeds from the issuance of Common
         Units and Preference Units after the Closing Date.

                  "ERISA": the Employee Retirement Income Security Act of 1974,
         as amended from time to time.

                  "Eurocurrency Reserve Requirements": for any day as applied to
         a Eurodollar Loan, the aggregate (without duplication) of the rates
         (expressed as a decimal) of reserve requirements in effect on such day
         (including, without limitation, basic, supplemental,



<PAGE>   15


                                                                              10

         marginal and emergency reserves under any regulations of the Board of
         Governors of the Federal Reserve System or other Governmental Authority
         having jurisdiction with respect thereto) dealing with reserve
         requirements prescribed for eurocurrency funding (currently referred to
         as "Eurocurrency Liabilities" in Regulation D of such Board) maintained
         by a member bank of such System.

                  "Eurodollar Base Rate": with respect to each day during each
         Interest Period pertaining to a Eurodollar Loan, the rate per annum
         equal to the rate at which Chase is offered Dollar deposits at or about
         10:00 A.M., New York City time, two Working Days prior to the beginning
         of such Interest Period in the interbank eurodollar market where the
         eurodollar and foreign currency and exchange operations in respect of
         its Eurodollar Loans are then being conducted for delivery on the first
         day of such Interest Period for the number of days comprised therein
         and in an amount comparable to the amount of its Eurodollar Loan to be
         outstanding during such Interest Period.

                  "Eurodollar Loans": Revolving Credit Loans the rate of
         interest applicable to which is based upon the Eurodollar Rate.

                  "Eurodollar Rate": with respect to each day during each
         Interest Period pertaining to a Eurodollar Loan, a rate per annum
         determined for such day in accordance with the following formula
         (rounded upward to the nearest 1/100th of 1%):

                              Eurodollar Base Rate
                    ----------------------------------------
                    1.00 - Eurocurrency Reserve Requirements

                  "Event of Default": any of the events specified in Section 9,
         provided that any requirement for the giving of notice, the lapse of
         time, or both, or any other condition, has been satisfied.

                  "Ewing Bank": Ewing Bank Gathering Company, L.L.C., a Delaware
         limited liability company.

                  "Existing Credit Agreement": as defined in the recitals
         hereto.

                  "Expiry Date": with respect to any Letter of Credit at any
         time, the then stated expiration date of such Letter of Credit as set
         forth in such Letter of Credit.

                  "FASB 121": Statement of Financial Accounting Standards No.
         121 of the Financial Accounting Standards Board, as the same may be
         amended and interpreted by the Financial Accounting Standards Board.

                  "FERC": the Federal Energy Regulatory Commission and any
         successor thereto.

                  "Flextrend": Flextrend Development Company, L.L.C., a Delaware
         limited liability company.




<PAGE>   16


                                                                              11

                  "GAAP": generally accepted accounting principles in the United
         States of America in effect from time to time.

                  "General Partner": Leviathan in its capacity as the general
         partner of the Borrower or any other Person acting as general partner
         of the Borrower.

                  "General Partnership Interest": all general partnership
         interests in the Borrower.

                  "Governmental Approval": any authorization, consent, approval,
         license, lease, ruling, permit, tariff, rate, certification, exemption,
         filing, variance, claim, order, judgment, decree, publication, notice
         to, declaration of or with or registration by or with any Governmental
         Authority.

                  "Governmental Authority": any nation or government, any state
         or other political subdivision thereof and any entity exercising
         executive, legislative, judicial, regulatory or administrative
         functions of or pertaining to government.

                  "Green Canyon": Green Canyon Pipe Line Company, L.L.C., a
         Delaware limited liability company.

                  "Guarantee Obligation": as to any Person (the "guaranteeing
         person"), any obligation of (a) the guaranteeing person or (b) another
         Person (including, without limitation, any bank under any letter of
         credit) to induce the creation of which the guaranteeing person has
         issued a reimbursement, counterindemnity or similar obligation, in
         either case guaranteeing or in effect guaranteeing any Indebtedness,
         leases, dividends or other obligations (the "primary obligations") of
         any other third Person (the "primary obligor") in any manner, whether
         directly or indirectly, including, without limitation, any obligation
         of the guaranteeing person, whether or not contingent, (i) to purchase
         any such primary obligation or any property constituting direct or
         indirect security therefor, (ii) to advance or supply funds (1) for the
         purchase or payment of any such primary obligation or (2) to maintain
         working capital or equity capital of the primary obligor or otherwise
         to maintain the net worth or solvency of the primary obligor, (iii) to
         purchase property, securities or services primarily for the purpose of
         assuring the owner of any such primary obligation of the ability of the
         primary obligor to make payment of such primary obligation or (iv)
         otherwise to assure or hold harmless the owner of any such primary
         obligation against loss in respect thereof; provided, however, that the
         term Guarantee Obligation shall not include endorsements of instruments
         for deposit or collection in the ordinary course of business. The
         amount of any Guarantee Obligation of any guaranteeing person shall be
         deemed to be the lower of (a) an amount equal to the stated or
         determinable amount of the primary obligation in respect of which such
         Guarantee Obligation is made and (b) the maximum amount for which such
         guaranteeing person may be liable pursuant to the terms of the
         instrument embodying such Guarantee Obligation, unless such primary
         obligation and the maximum amount for which such guaranteeing person
         may be liable are not stated or determinable, in which case the amount
         of such Guarantee Obligation shall be such guaranteeing person's
         maximum reasonably anticipated liability in respect thereof as
         determined by the Borrower in good faith.



<PAGE>   17


                                                                              12

                  "Guarantees": collectively, the Leviathan Guarantee and the
         Subsidiaries Guarantee.

                  "Hazardous Materials": any hazardous materials, hazardous
         wastes, hazardous constituents, hazardous or toxic substances,
         petroleum products (including crude oil or any fraction thereof),
         defined or regulated as such in or under any Environmental Law.

                  "Hedge Agreements": all interest rate swaps, caps or collar
         agreements or similar arrangements dealing with interest rates or
         currency exchange rates or the exchange of nominal interest
         obligations, either generally or under specific contingencies.

                  "Incurrence Limitation": on any date of determination, the
         product of (x) 5.35 (or, from and after the Equity Adjustment Date,
         5.00) multiplied by (y) the Consolidated EBITDA for the most recently
         ended Calculation Period for which financial statements have been
         delivered pursuant to subsection 7.1. Notwithstanding the foregoing,
         from the Closing Date to the date on which the certificate of a
         Responsible Officer of the Borrower is delivered pursuant to subsection
         7.2(b) for the Borrower's fiscal quarter ending June 30, 1999 (or, if
         earlier, the date on which a Responsible Officer of the Borrower
         delivers a certificate pursuant to clause (x) of the definition of
         "Applicable Margin" for the fiscal quarter ending June 30, 1999), the
         Incurrence Limitation shall be the product of (i) 5.35 multipled by
         (ii) Consolidated EBITDA for the Calculation Period ended March 31,
         1999, it being agreed that for such purposes Consolidated EBITDA for
         each of the second, third and fourth quarters of fiscal year 1998 and
         the first quarter of fiscal year 1999 shall be deemed to be $23,500,000
         and Consolidated EBITDA for the second quarter of fiscal year 1999
         shall be calculated in accordance with the definiton thereof.

                  "Indebtedness": of any Person at any date, (a) all
         indebtedness of such Person for borrowed money or for the deferred
         purchase price of property or services (other than current trade
         liabilities incurred in the ordinary course of business and payable in
         accordance with customary practices and which in any event are no more
         than 120 days past due or, if more than 120 days past due, are being
         contested in good faith and adequate reserves with respect thereto have
         been made on the books, of such Person), (b) any other indebtedness of
         such Person which is evidenced by a note, bond, debenture or similar
         instrument, (c) all obligations of such Person under Capital Leases,
         (d) all obligations of such Person in respect of outstanding letters of
         credit (other than commercial letters of credit with an initial
         maturity date of less than 90 days), acceptances and similar
         obligations issued or created for the account of such Person, (e) all
         liabilities secured by any Lien on any property owned by such Person
         even though such Person has not assumed or otherwise become liable for
         the payment thereof and (f) for purposes of the covenants set forth in
         subsection 8.1, the net obligations of such Person under Hedge
         Agreements.

                  "Insolvency": with respect to any Multiemployer Plan, the
         condition that such Plan is insolvent within the meaning of Section
         4245 of ERISA.

                  "Insolvent": pertaining to a condition of Insolvency.




<PAGE>   18


                                                                              13

                  "Interest Payment Date": (a) as to any Alternate Base Rate
         Loan, the last day of each March, June, September and December,
         commencing June 30, 1999, (b) as to any Eurodollar Loan having an
         Interest Period of three months or less, the last day of such Interest
         Period, and (c) as to any Eurodollar Loan having an Interest Period
         longer than three months, each day which is three months or a whole
         multiple thereof, after the first day of such Interest Period and the
         last day of such Interest Period.

                  "Interest Period": with respect to any Eurodollar Loan:

                           (i) initially, the period commencing on the borrowing
                  or conversion date, as the case may be, with respect to such
                  Eurodollar Loan and ending one, two, three or six months
                  thereafter, as selected by the Borrower in its notice of
                  borrowing or notice of conversion, as the case may be, given
                  with respect thereto; and

                           (ii) thereafter, each period commencing on the last
                  day of the next preceding Interest Period applicable to such
                  Eurodollar Loan and ending one, two, three or six months
                  thereafter, as selected by the Borrower by irrevocable notice
                  to the Administrative Agent not less than three Working Days
                  prior to the last day of the then current Interest Period with
                  respect thereto;

         provided that, all of the foregoing provisions relating to Interest
         Periods are subject to the following:

                           (1) if any Interest Period pertaining to a Eurodollar
                  Loan would otherwise end on a day that is not a Working Day,
                  such Interest Period shall be extended to the next succeeding
                  Working Day unless the result of such extension would be to
                  carry such Interest Period into another calendar month in
                  which event such Interest Period shall end on the immediately
                  preceding Working Day;

                           (2) any Interest Period that would otherwise extend
                  beyond the Revolving Credit Termination Date shall end on the
                  Revolving Credit Termination Date;

                           (3) any Interest Period pertaining to a Eurodollar
                  Loan that begins on the last Working Day of a calendar month
                  (or on a day for which there is no numerically corresponding
                  day in the calendar month at the end of such Interest Period)
                  shall end on the last Working Day of a calendar month; and

                           (4) the Borrower shall select Interest Periods so as
                  not to require a payment or prepayment of any Eurodollar Loan
                  during an Interest Period for such Revolving Credit Loan.

                  "Issuing Bank": Chase, in its capacity as issuer of any Letter
         of Credit.

                  "Joint Venture": any Person in which the Borrower and/or its
         Subsidiaries hold more than 5% but less than a majority of the equity
         interests, and which does not constitute a Subsidiary of the Borrower,
         whether direct or indirect; provided that each of



<PAGE>   19


                                                                              14

         Western Gulf, UTOS and their respective Subsidiaries shall be deemed to
         be a Joint Venture for purposes of the Loan Documents until the
         Borrower designates such Person as a Subsidiary.

                  "Joint Venture Charter": with respect to each Joint Venture,
         the partnership agreement, certificate of incorporation, by-laws,
         limited liability company agreement or other constitutive documents of
         such Joint Venture, as each of the same may be further amended,
         supplemented or otherwise modified in accordance with subsection 8.9.

                  "L/C Commitment Amount": $25,000,000.

                  "L/C Commitment Percentage": as to any L/C Participant at any
         time, the percentage determined under paragraph (a) of the definition
         of "Commitment Percentage" in this subsection 1.1.

                  "L/C Obligations": at any time, an amount equal to the sum of
         (a) the aggregate then undrawn and unexpired amount of the Letters of
         Credit and (b) the aggregate amount of drawings under the Letters of
         Credit which have not then been reimbursed pursuant to subsection
         3.5(a).

                  "L/C Participants": the collective reference to all Lenders
         with Revolving Credit Commitments (other than the Issuing Bank).

                  "Lenders": as defined in the preamble to this Agreement.

                  "Letters of Credit": as defined in subsection 3.1(a).

                  "Leverage Ratio": as defined in the definition of "Applicable
         Margin".

                  "Leviathan": Leviathan Gas Pipeline Company, a Delaware
         corporation.

                  "Leviathan Guarantee": the Amended and Restated Guarantee made
         by Leviathan in favor of the Administrative Agent, for the benefit of
         the Lenders, substantially in the form of Exhibit E hereto, as the same
         may be amended, supplemented or otherwise modified from time to time.

                  "Leviathan Pledge Agreement (LLC)": the Amended and Restated
         Pledge and Security Agreement made by Leviathan in favor of the
         Administrative Agent for the benefit of the Lenders, substantially in
         the form of Exhibit F hereto, with respect to Leviathan's limited
         liability company interests in the Subsidiaries, as the same may be
         amended, supplemented or otherwise modified from time to time.

                  "Leviathan Pledge Agreement (GP)": the Amended and Restated
         Pledge Agreement made by Leviathan in favor of the Administrative Agent
         for the benefit of the Lenders, substantially in the form of Exhibit G
         hereto, with respect to Leviathan's General Partnership Interest, as
         the same may be amended, supplemented or otherwise modified from time
         to time.



<PAGE>   20


                                                                              15

                  "Leviathan Pledge Agreements": collectively, the Leviathan
         Pledge Agreement (LLC) and the Leviathan Pledge Agreement (GP).

                  "Leviathan Security Agreement": the Amended and Restated
         Security Agreement, made by Leviathan in favor of the Administrative
         Agent for the benefit of the Lenders, substantially in the form of
         Exhibit H hereto, as the same may be amended, supplemented or otherwise
         modified from time to time.

                  "Lien": any mortgage, pledge, hypothecation, assignment,
         deposit arrangement, encumbrance, lien (statutory or other), charge or
         other security interest or any preference, priority, preferential
         arrangement or other security agreement of any kind or nature
         whatsoever (including, without limitation, any conditional sale or
         other title retention agreement and any Capital Lease having
         substantially the same economic effect as any of the foregoing).

                  "Loan Documents": this Agreement, the Revolving Credit Notes,
         the Guarantees, the Security Documents and the Applications.

                  "Loan Parties": the Borrower, the Co-Borrower, Leviathan, the
         Subsidiary Guarantors and each other Affiliate of the Borrower or
         Leviathan that from time to time is party to a Loan Document.

                  "LOTS: Leviathan Oil Transport Systems, L.L.C., a Delaware
         limited liability company.

                  "Management Agreement": (i) the First Amended and Restated
         Management Agreement, dated as of June 27, 1994, between DeepTech
         International Inc. and the General Partner, as amended and in effect on
         the Closing Date, and as further amended, modified or supplemented from
         time to time in accordance with subsection 8.9, or (ii) any other
         agreement or arrangement, reasonably acceptable to the Administrative
         Agent, providing management, administrative, operational and other
         functions to the Borrower adequate to allow the Borrower to conduct
         operations consistent with prior practices.

                  "Manta Ray": Manta Ray Gathering Company, L.L.C., a Delaware
         limited liability company.

                  "Material Adverse Effect": a material adverse effect on (a)
         the business, operations, property, condition (financial or otherwise)
         or prospects of the Borrower and its Restricted Subsidiaries taken as a
         whole, (b) the ability of any Loan Party to perform its obligations
         under this Agreement or any of the Revolving Credit Notes or any of the
         other Loan Documents or (c) the validity or enforceability of this
         Agreement or any of the Revolving Credit Notes or any of the other Loan
         Documents or the rights or remedies of the Administrative Agent or the
         Lenders hereunder or thereunder.

                  "Material Environmental Amount": an amount payable by the
         Borrower and/or its Subsidiaries in excess of $5,000,000 for remedial
         costs, compliance costs, compensatory damages, punitive damages, fines,
         penalties or any combination thereof.



<PAGE>   21


                                                                              16

                  "Materials of Environmental Concern": any gasoline or
         petroleum (including crude oil or any fraction thereof) or petroleum
         products or any hazardous or toxic substances, materials or wastes,
         defined or regulated as such in or under any Environmental Law,
         including, without limitation, asbestos, polychlorinated biphenyls and
         urea-formaldehyde insulation.

                  "Multiemployer Plan": a Plan which is a multiemployer plan as
         defined in Section 4001(a)(3) of ERISA.

                  "Net Equity Proceeds": 100% of the cash proceeds from the
         issuance or sale by the Borrower or any of its Restricted Subsidiaries
         of any equity securities, net of all reasonable out-of-pocket fees
         (including investment banking fees), commissions, costs and other
         reasonable out-of-pocket expenses incurred in connection with such
         issuance or sale. For purposes of calculating "Net Equity Proceeds",
         fees, commissions and other costs and expenses payable to the Borrower
         or any of its Affiliates shall be disregarded.

                  "NGPL":  as defined in subsection 4.13(b).

                  "Non-Recourse Obligations": Indebtedness, Guarantee
         Obligations and other obligations of any type (a) as to which neither
         the Borrower nor any Restricted Subsidiary (i) is obligated to provide
         credit support in any form, or (ii) is directly or indirectly liable,
         in each case except for clawbacks permitted pursuant to subsections
         8.4(e) and (f), and (b) no default with respect to which (including any
         rights which the holders thereof may have to take enforcement action
         against an Unrestricted Subsidiary) would permit (upon notice, lapse of
         time or both) any holder of any Indebtedness or Guarantee Obligation of
         the Borrower or any Restricted Subsidiary to declare a default on such
         Indebtedness or Guarantee Obligation of the Borrower or any Restricted
         Subsidiary or cause the payment of any such Indebtedness to be
         accelerated or payable prior to its stated maturity or cause any such
         Guarantee Obligation to become payable.

                  "Obligations": the unpaid principal of and interest on
         (including interest accruing after the maturity of the Loans and
         reimbursement obligations in respect of Letters of Credit and interest
         accruing after the filing of any petition in bankruptcy, or the
         commencement of any insolvency, reorganization or like proceeding,
         relating to the Borrower, whether or not a claim for post-filing or
         post-petition interest is allowed in such proceeding) the Loans and all
         other obligations and liabilities of the Borrower to the Administrative
         Agent or to any Lender (or, in the case of Hedge Agreements, any
         affiliate of any Lender), whether direct or indirect, absolute or
         contingent, due or to become due, or now existing or hereafter
         incurred, which may arise under, out of, or in connection with, this
         Agreement, any other Loan Document, the Letters of Credit, any Hedge
         Agreement entered into with any Lender or any affiliate of any Lender
         or any other document made, delivered or given in connection herewith
         or therewith, whether on account of principal, interest, reimbursement
         obligations, fees, indemnities, costs, expenses (including all fees,
         charges and disbursements of counsel to the Administrative Agent or to
         any Lender that are required to be paid by the Borrower pursuant
         hereto) or otherwise.




<PAGE>   22


                                                                              17

                  "Participants": as defined in subsection 11.6(b).

                  "Partnership Agreement": the Amended and Restated Agreement of
         Limited Partnership of the Borrower among the partners of the Borrower
         dated as of February 19, 1993 and as in effect on the Closing Date, as
         amended, modified and supplemented from time to time in accordance with
         subsection 8.9.

                  "PBGC": the Pension Benefit Guaranty Corporation established
         pursuant to Subtitle A of Title IV of ERISA.

                  "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.

                  "Petroleum": oil, gas and other liquid or gaseous
         hydrocarbons, including, without limitation, all liquefiable
         hydrocarbons and other products which may be extracted from gas and gas
         condensate by the processing thereof in a gas processing plant.

                  "Plan": at a particular time, any employee benefit plan which
         is covered by ERISA and in respect of which the Borrower or a Commonly
         Controlled Entity is (or, if such plan were terminated at such time,
         would under Section 4069 of ERISA be deemed to be) an "employer" as
         defined in Section 3(5) of ERISA.

                  "Pledge Agreements": collectively, the Borrower Pledge
         Agreement, the Leviathan Pledge Agreements and any other pledge
         agreement executed and delivered pursuant to subsection 8.17.

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

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

                  "Preference Unit": a partnership interest in the Borrower
         representing a fractional part of the partnership interests of all
         limited partners of the Borrower and having the rights and obligations
         specified with respect to Preference Units in the Partnership
         Agreement.

                  "Properties": the facilities and properties owned, leased or
         operated by the Borrower or any of its Subsidiaries or any Joint
         Venture.

                  "Purchasing Lenders": as defined in subsection 11.6(c).

                  "Redesignation": any designation of a Restricted Subsidiary as
         an Unrestricted Subsidiary in accordance with the last sentence of the
         definition of "Unrestricted Subsidiary"; and any designation of an
         Unrestricted Subsidiary or a Joint Venture as a



<PAGE>   23


                                                                              18

         Restricted Subsidiary in accordance with the last sentence of the
         definition of "Restricted Subsidiary".

                  "Regulation U": Regulation U of the Board of Governors of the
         Federal Reserve System as in effect from time to time.

                  "Reimbursement Obligation": the obligation of the Borrower to
         reimburse the Issuing Bank pursuant to subsection 3.5(a) for amounts
         drawn under the Letters of Credit.

                  "Reorganization": with respect to any Multiemployer Plan, the
         condition that such plan is in reorganization within the meaning of
         Section 4241 of ERISA.

                  "Reportable Event": any of the events set forth in Section
         4043(b) of ERISA, other than those events as to which the thirty day
         notice period is waived under subsections .13, .14, .16, .18, .19 or
         .20 of PBGC Reg. Section 2615.

                  "Required Lenders": at any time, the holders of at least 51%
         of the aggregate Revolving Credit Commitments then in effect (or, if
         the Revolving Credit Commitments have been terminated, the holders of
         at least 51% of the Aggregate Outstanding Revolving Credit Extentions
         of Credit of all Lenders).

                  "Requirement of Law": as to any Person, the Certificate of
         Incorporation and By-Laws or other organizational or governing
         documents of such Person, and any law, treaty, rule or regulation or
         determination of an arbitrator or a court or other Governmental
         Authority, in each case applicable to or binding upon such Person or
         any of its property or to which such Person or any of its property is
         subject.

                  "Reserve Report": a report in form and substance reasonably
         satisfactory to the Administrative Agent certified by Netherland
         Sewell, Ryder Scott, H.J. Gruy or another independent petroleum
         engineer acceptable to the Administrative Agent setting forth (a) the
         amount of and projected production of Petroleum from the proven
         Petroleum reserves attributable to the Subject Properties and (b) the
         projected future net income taking into account sales revenues, lease
         operating expenses, associated production taxes and capital costs, and
         setting forth the net present value attributable to such reserves
         attributable to the Subject Properties as of the date of such report
         (in each case determined using pricing assumptions reasonably
         satisfactory to the Administrative Agent).

                  "Responsible Officer": the Chief Executive Officer, the Chief
         Operating Officer, the President, the Chief Financial Officer, the
         Treasurer or any vice president of the General Partner or the Borrower.

                  "Restricted Payment": as defined in subsection 8.7.

                  "Restricted Subsidiary": any Subsidiary of the Borrower other
         than an Unrestricted Subsidiary. Subject to the right to redesignate
         certain Restricted Subsidiaries as Unrestricted Subsidiaries in
         accordance with the definition of "Unrestricted Subsidiary", all of the
         Subsidiaries of the Borrower as of the date hereof are



<PAGE>   24


                                                                              19

         Restricted Subsidiaries. Notwithstanding the foregoing, any Subsidiary
         which guarantees the Senior Subordinated Notes shall be a Restricted
         Subsidiary. Any Subsidiary designated as an Unrestricted Subsidiary may
         be redesignated as a Restricted Subsidiary with the consent of the
         Required Lenders as long as, after giving effect thereto, no Default or
         Event of Default has occurred and is continuing and the Borrower would
         be in pro forma compliance with the covenants set forth in subsection
         8.1 after giving effect thereto.

                  "Revolving Credit Commitment": as to any Lender, the
         obligation of such Lender to make Revolving Credit Loans to and/or
         issue or participate in Letters of Credit issued on behalf of the
         Borrower hereunder in an aggregate principal and/or face amount at any
         one time outstanding not to exceed the amount set forth opposite such
         Lender's name on Schedule I under the heading "Revolving Credit
         Commitment", as such amount may be reduced from time to time in
         accordance with the provisions of this Agreement.

                  "Revolving Credit Commitment Period": the period from and
         including the date hereof to but not including the Revolving Credit
         Termination Date or such earlier date on which the Revolving Credit
         Commitments shall terminate as provided herein.

                  "Revolving Credit Loans": as defined in subsection 2.1.

                  "Revolving Credit Note": as defined in subsection 2.2.

                  "Revolving Credit Termination Date": the third anniversary of
         the Closing Date, as such termination date may from time to time be
         extended pursuant to subsection 2.7, and any other date on which the
         Revolving Credit Commitments are terminated.

                  "Security Agreements": collectively, the Borrower Security
         Agreement, the Leviathan Security Agreement and the Subsidiary Security
         Agreements.

                  "Security Documents": collectively, the Pledge Agreements and
         the Security Agreements.

                  "Senior Subordinated Note Indenture": the Indenture entered
         into by the Borrower, the Co-Borrower and certain of their respective
         Subsidiaries in connection with the issuance of the Senior Subordinated
         Notes, together with all instruments and other agreements entered into
         by the Borrower, the Co-Borrower or such Subsidiaries in connection
         therewith, as the same may be amended, supplemented or otherwise
         modified from time to time in accordance with subsection 8.9.

                  "Senior Subordinated Notes": the subordinated notes of the
         Borrower and the Co-Borrower issued on the Closing Date pursuant to the
         Senior Subordinated Note Indenture.

                  "Single Employer Plan": any Plan which is covered by Title IV
         of ERISA, but which is not a Multiemployer Plan.




<PAGE>   25


                                                                              20

                  "Stingray Holding": Stingray Holding, L.L.C., a Delaware
         limited liability company.

                  "Subject Properties": the Properties containing Petroleum in
         which Borrower or any Restricted Subsidiary owns an interest,
         including, but not limited to, those known as Viosca Knoll 817, Garden
         Banks 72 and Garden Banks 117 in the Gulf of Mexico.

                  "Subsidiaries Guarantee": the Amended and Restated
         Subsidiaries Guarantee made by the Subsidiary Guarantors in favor of
         the Administrative Agent, for the benefit of the Lenders, substantially
         in the form of Exhibit J hereto, as the same may be amended,
         supplemented or otherwise modified from time to time.

                  "Subsidiary": as to any Person, a corporation, partnership or
         other entity of which shares of stock or other ownership interests
         having ordinary voting power (other than stock or such other ownership
         interests having such power only by reason of the happening of a
         contingency) to elect a majority of the board of directors or other
         managers of such corporation, partnership or other entity are at the
         time owned, or the management of which is otherwise controlled,
         directly or indirectly through one or more intermediaries, or both, by
         such Person. Unless otherwise qualified, all references to a
         "Subsidiary" or to "Subsidiaries" in this Agreement shall refer to a
         Subsidiary or Subsidiaries of the Borrower. Notwithstanding the
         foregoing, each of Western Gulf, UTOS, and their respective
         Subsidiaries shall be deemed not to be a Subsidiary of the Borrower
         unless, and to the extent, any of Western Gulf and its Subsidiaries or
         UTOS and its Subsidiaries, as the case may be, is designated as a
         Subsidiary of the Borrower in a writing delivered by the Borrower to
         the Administrative Agent.

                  "Subsidiary Guarantors": collectively, Delos, Ewing Bank,
         Flextrend, Green Canyon, LOTS, Manta Ray, Poseidon, Stingray Holding,
         Tarpon, THC, TOGT, TOPC, VK Deepwater, VK Main Pass, Sailfish, Viosca
         Knoll (on and after the date Viosca Knoll becomes a Subsidiary), each
         other Restricted Subsidiary and any other Subsidiary of the Borrower
         which, from time to time, may become party to the Subsidiaries
         Guarantee. Notwithstanding anything to the contrary in the Loan
         Documents, Leviathan Finance Corporation shall be the Co-Borrower and
         not a Subsidiary Guarantor.

                  "Subsidiary Security Agreement": each Security Agreement made
         by each of the Subsidiary Guarantors (including any security agreement
         executed and delivered pursuant to subsection 8.17) in favor of the
         Administrative Agent for the benefit of the Lenders, substantially in
         the form of Exhibit K hereto, as the same may be amended, supplemented
         or otherwise modified from time to time.

                  "Tarpon": Tarpon Transmission Company, a Texas corporation.

                  "THC": Transco Hydrocarbons Company, L.L.C., a Delaware
         limited liability company.

                  "TOGT": Texam Offshore Gas Transmission, L.L.C., a Delaware
         limited liability company.



<PAGE>   26


                                                                              21

                  "TOPC": Transco Offshore Pipeline Company, L.L.C., a Delaware
         limited liability company.

                  "Tranche": the collective reference to Eurodollar Loans the
         Interest Periods with respect to all of which begin on the same date
         and end on the same later date (whether or not such Revolving Credit
         Loans shall originally have been made on the same day).

                  "Transferee": as defined in subsection 11.6(f).

                  "Type": as to any Revolving Credit Loan, its nature as an
         Alternate Base Rate Loan or a Eurodollar Loan.

                  "Uniform Customs": the Uniform Customs and Practice for
         Documentary Credits (1993 Revision), International Chamber of Commerce
         Publication No. 500, as the same may be amended from time to time.

                  "Unrestricted Subsidiary": any Subsidiary of the Borrower (a)
         which becomes a Subsidiary of the Borrower after the date hereof and,
         at the time it becomes a Subsidiary, is designated as an Unrestricted
         Subsidiary, in each case (a) pursuant to a written notice from the
         Borrower to the Administrative Agent, (b) which has not acquired any
         assets (other than cash made available pursuant to this Agreement) from
         the Borrower or any Restricted Subsidiary, (c) which has no
         Indebtedness, Guarantee Obligations or other obligations other than
         Non-Recourse Obligations to the extent the applicable guarantor has
         guaranteed payment of the obligations of the Borrower under this
         Agreement and (d) which has not guaranteed the Senior Subordinated
         Notes. Any Subsidiary designated as a Restricted Subsidiary may be
         redesignated as an Unrestricted Subsidiary with the consent of the
         Required Lenders as long as, after giving effect thereto, no Default or
         Event of Default has occurred and is continuing and the Borrower would
         be in pro forma compliance with the financial covenants after giving
         effect thereto.

                  "UTOS": U-T Offshore System, a Delaware general partnership.

                  "Viosca Knoll": Viosca Knoll Gathering Company, a Delaware
         joint venture.

                  "VK Deepwater": VK Deepwater Gathering Company, L.L.C., a
         Delaware limited liability company.

                  "VK Main Pass": VK-Main Pass Gathering Company, L.L.C., a
         Delaware limited liability company.

                  "West Cameron": West Cameron Dehydration Company, L.L.C., a
         Delaware limited liability company.

                  "Western Gulf": Western Gulf Holdings, L.L.C., a Delaware
         limited liability company, which owns all of High Island Offshore
         System, L.L.C. and East Breaks Gathering Company, L.L.C. on the Closing
         Date.




<PAGE>   27


                                                                              22

                  "Working Day": any Business Day on which dealings in foreign
         currencies and exchange between banks may be carried on in London,
         England.

                  1.2 Other Definitional Provisions. (a) Unless otherwise
specified therein, all terms defined in this Agreement shall have the defined
meanings when used in the Revolving Credit Notes or any certificate or other
document made or delivered pursuant hereto.

                  (b) As used herein and in the Revolving Credit Notes, and any
certificate or other document made or delivered pursuant hereto, accounting
terms relating to the Borrower and its Subsidiaries not defined in subsection
1.1 and accounting terms partly defined in subsection 1.1, to the extent not
defined, shall have the respective meanings given to them under GAAP.

                  (c) The words "hereof", "herein" and "hereunder" and words of
similar import when used in this Agreement shall refer to this Agreement as a
whole and not to any particular provision of this Agreement, and Section,
subsection, Schedule and Exhibit references are to this Agreement unless
otherwise specified.

                  (d) The meanings given to terms defined herein shall be
equally applicable to both the singular and plural forms of such terms.


           SECTION 2. AMOUNT AND TERMS OF REVOLVING CREDIT COMMITMENTS

                  2.1 Revolving Credit Commitments. (a) Subject to the terms and
conditions hereof, each Lender severally agrees to make revolving credit loans
("Revolving Credit Loans") to the Borrower from time to time during the
Revolving Credit Commitment Period in an aggregate principal amount at any one
time outstanding which, when added to such Lender's Commitment Percentage of the
then outstanding L/C Obligations, does not exceed the amount of such Lender's
Revolving Credit Commitment, provided that no such Revolving Credit Loan shall
be made if, after giving effect thereto, subsection 2.4 would be contravened.
During the Revolving Credit Commitment Period the Borrower may use the Revolving
Credit Commitments by borrowing, prepaying the Revolving Credit Loans in whole
or in part, and reborrowing, all in accordance with the terms and conditions
hereof.

                  (b) The Revolving Credit Loans may from time to time be (i)
Eurodollar Loans, (ii) Alternate Base Rate Loans or (iii) a combination thereof,
as determined by the Borrower and notified to the Administrative Agent in
accordance with subsections 2.3 and 4.2, provided that no Revolving Credit Loan
shall be made as a Eurodollar Loan after the day that is one month prior to the
Revolving Credit Termination Date.

                  (c) The revolving credit loans outstanding on the Closing Date
under the Existing Credit Agreement shall continue to be outstanding and shall
be continued under this Agreement.

                  2.2 Repayment of Loans; Evidence of Debt. (a) The Borrower
hereby unconditionally promises to pay Revolving Credit Loans to the
Administrative Agent for the



<PAGE>   28


                                                                              23

account of each Lender the then unpaid principal amount of each Revolving Credit
Loan on the Revolving Credit Termination Date.

                  (b) Each Lender shall maintain in accordance with its usual
practice an account or accounts evidencing the indebtedness of the Borrower to
such Lender resulting from each Revolving Credit Loan made by such Lender,
including the amounts of principal and interest payable and paid to such Lender
from time to time hereunder.

                  (c) The Administrative Agent shall maintain accounts in which
it shall record (i) the amount of each Revolving Credit Loan made hereunder, the
Type thereof and the Interest Period applicable thereto, (ii) the amount of any
principal or interest due and payable or to become due and payable from the
Borrower to each Lender hereunder and (iii) the amount of any sum received by
the Administrative Agent hereunder for the account of the Lenders and each
Lender's share thereof.

                  (d) The entries made in the accounts maintained pursuant to
paragraph (b) or (c) of this subsection shall be prima facie evidence of the
existence and amounts of the obligations recorded therein; provided that the
failure of any Lender or the Administrative Agent to maintain such accounts or
any error therein shall not in any manner affect the obligation of the Borrower
to repay the Revolving Credit Loans in accordance with the terms of this
Agreement.

                  (e) Any Lender may request that Revolving Credit Loans made by
it be evidenced by a promissory note substantially in the form of Exhibit A
hereto (a "Revolving Credit Note"). In such event, the Borrower shall prepare,
execute and deliver to such Lender a promissory note payable to the order of
such Lender (or, if requested by such Lender, to such Lender and its registered
assigns) and in a form approved by the Administrative Agent and the Borrower.
Thereafter, the Revolving Credit Loans evidenced by such promissory note and
interest thereon shall at all times (including after assignment pursuant to
Section 9.04) be represented by one or more promissory notes in such form
payable to the order of the payee named therein (or, if such promissory note is
a registered note, to such payee and its registered assigns).

                  2.3 Procedure for Revolving Credit Borrowing. The Borrower may
borrow under the Revolving Credit Commitments during the Revolving Credit
Commitment Period on any Working Day, if all or any part of the requested
Revolving Credit Loans are to be initially Eurodollar Loans, or on any Business
Day, otherwise, provided that the Borrower shall give the Administrative Agent
irrevocable notice (which notice must be received by the Administrative Agent
prior to 10:00 A.M., New York City time, (a) three Working Days prior to the
requested Borrowing Date, if all or any part of the requested Revolving Credit
Loans are to be initially Eurodollar Loans, or (b) one Business Day prior to the
requested Borrowing Date, otherwise), specifying (i) the amount to be borrowed,
(ii) the requested Borrowing Date, (iii) whether the borrowing is to be of
Eurodollar Loans, Alternate Base Rate Loans or a combination thereof, and (iv)
if the borrowing is to be entirely or partly of Eurodollar Loans, the respective
amounts of such Type of Revolving Credit Loan and the respective lengths of the
initial Interest Periods therefor. Each borrowing under the Revolving Credit
Commitments shall be in an amount equal to (x) in the case of Alternate Base
Rate Loans, $500,000 or a whole multiple thereof (or, if the then Available
Revolving Credit Commitments are less than $500,000, such lesser amount) and (y)
in the case of Eurodollar Loans, $1,000,000 or a whole multiple of $100,000 in
excess



<PAGE>   29


                                                                              24

thereof. Upon receipt of any such notice from the Borrower, the Administrative
Agent shall promptly notify each Lender thereof. Each Lender will make the
amount of its pro rata share of each borrowing available to the Administrative
Agent for the account of the Borrower at the office of the Administrative Agent
specified in subsection 11.2 prior to 11:00 A.M., New York City time, on the
Borrowing Date requested by the Borrower in funds immediately available to the
Administrative Agent. Such borrowing will then be made available to the Borrower
by the Administrative Agent crediting the account of the Borrower on the books
of such office with the aggregate of the amounts made available to the
Administrative Agent by the Lenders and in like funds as received by the
Administrative Agent.

                  2.4 Limitations on Revolving Credit Loans. No requested
Revolving Credit Loan shall be made if the sum of the Aggregate Outstanding
Revolving Credit Extensions of Credit (after giving effect to such requested
Revolving Credit Loan) would exceed the lesser of (a) the then aggregate
Revolving Credit Commitments or (b) the Incurrence Limitation then in effect.

                  2.5 Commitment Fee. The Borrower agrees to pay to the
Administrative Agent for the account of each Lender a commitment fee for the
period from and including the date hereof to the Revolving Credit Termination
Date, computed at the rate per annum equal to:

                  (a) the then Applicable Margin for the Commitment Fee as set
forth under the column heading "Commitment Fee" on the average daily amount of
the lesser of: (i) the Available Revolving Credit Commitment of such Lender or
(ii) an amount equal to such Lender's Commitment Percentage of (x) the
Incurrence Limitation then in effect minus (y) the Aggregate Outstanding
Revolving Credit Extensions of Credit, plus

                  (b) the then Applicable Margin for the Incremental Commitment
Fee as set forth under the column heading "Incremental Commitment Fee" on the
average daily amount equal to such Lender's Commitment Percentage of (i) the
Revolving Credit Commitments minus (ii) the Incurrence Limitation then in
effect,

during the period for which payment is made, payable quarterly in arrears on the
last day of each March, June, September and December, commencing June 30, 1999
and on the Revolving Credit Termination Date or such earlier date as the
Revolving Credit Commitments shall terminate as provided herein, commencing on
the first of such dates to occur after the date hereof.

                  2.6 Termination or Reduction of Revolving Credit Commitments.
(a) The Borrower shall have the right, upon not less than five Business Days'
notice to the Administrative Agent, to terminate the Revolving Credit
Commitments or, from time to time, to reduce the amount of the Revolving Credit
Commitments, provided that no such termination or reduction shall be permitted
if, after giving effect thereto and to any prepayments of the Revolving Credit
Loans made on the effective date thereof, the aggregate principal amount of the
Revolving Credit Loans then outstanding, when added to the then outstanding L/C
Obligations, would exceed the Revolving Credit Commitments then in effect. Any
such reduction shall be in an amount equal to $5,000,000 or a whole multiple
thereof.




<PAGE>   30


                                                                              25

                  (b) Any reduction of Revolving Credit Commitments pursuant to
subsection 2.6(a) above or 4.1(b) shall reduce permanently the Revolving Credit
Commitments then in effect.

                  2.7 Extensions of Revolving Credit Termination Date. The
Borrower may, by irrevocable written notice to the Administrative Agent received
no later than 120 days prior to the Revolving Credit Termination Date then in
effect, request the Lenders to change such Revolving Credit Termination Date to
the date 364 days following such then scheduled Revolving Credit Termination
Date. Upon receipt of any such notice, the Administrative Agent shall promptly
notify each Lender thereof. Each Lender may consent or refuse to consent to such
change, in its sole discretion, at any time on or prior to the date which is 60
days prior to the Revolving Credit Termination Date then in effect. Upon the
receipt by the Administrative Agent of the written consent of each of the
Lenders to such change in the Revolving Credit Termination Date on or prior to
2:00 p.m., New York time, on the date which is 60 days prior to the Revolving
Credit Termination Date then in effect, the Revolving Credit Termination Date
shall be changed to such subsequent date 364 days following the Revolving Credit
Termination Date then in effect, and the term "Revolving Credit Termination
Date" for all purposes of this Agreement and the other Loan Documents shall
thereupon be deemed to refer to such subsequent date. Any failure of a Lender to
provide any such consent shall be deemed to be a refusal to consent to such
change.


                          SECTION 3. LETTERS OF CREDIT

                  3.1 Issuance of Letters of Credit. (a) Subject to the terms
and conditions hereof, the Issuing Bank, in reliance on the agreements of the
other Lenders set forth in subsection 3.3(a), agrees to issue letters of credit
(the "Letters of Credit") for the account of the Borrower on any Business Day
during the Revolving Credit Commitment Period in such form as may be approved
from time to time by the Issuing Bank; provided that the Issuing Bank shall have
no obligation to issue any Letter of Credit if, after giving effect to such
issuance, (1) the L/C Obligations would exceed the L/C Commitment or (2) the
Available Revolving Credit Commitment would be less than zero or (3) the
Aggregate Outstanding Revolving Credit Extensions of Credit would exceed the
lesser of (i) the then aggregate Revolving Credit Commitments or (ii) the
Incurrence Limitation then in effect.

                  (b)  Each Letter of Credit shall:

                  (1) be denominated in Dollars and shall be either (A) a
         standby letter of credit issued to support obligations of the Borrower
         or any Restricted Subsidiary, contingent or otherwise, in connection
         with the working capital and business needs of the Borrower or such
         Restricted Subsidiary, as the case may be, in the ordinary course of
         business, or (B) a commercial letter of credit issued in respect of the
         purchase of goods or services by the Borrower or any Restricted
         Subsidiary in the ordinary course of business; and

                  (2) expire no later than the earlier of (A) one year after the
         date of issuance or renewal thereof in accordance with the term of such
         Letter of Credit; provided that any



<PAGE>   31


                                                                              26

         Letter of Credit with a one-year tenure may be renewed for additional
         one-year periods and (B) five days prior to the Revolving Credit
         Termination Date.

                  (c) Each Letter of Credit shall be subject to the Uniform
Customs and, to the extent not inconsistent therewith, the laws of the State of
New York.

                  (d) The Issuing Bank shall not at any time be obligated to
issue any Letter of Credit hereunder if such issuance would conflict with, or
cause the Issuing Bank or any L/C Participant to exceed any limits imposed by,
any applicable Requirement of Law.

                  (e) Letters of Credit issued under the Existing Credit
Agreement which are outstanding on the Closing Date shall be deemed to be
Letters of Credit issued under this Agreement on the Closing Date.

                  3.2 Procedure for Issuance of Letters of Credit. The Borrower
may from time to time request that the Issuing Bank issue a Letter of Credit by
delivering to the Issuing Bank at its address for notices specified herein an
Application therefor, completed to the satisfaction of the Issuing Bank, and
such other certificates, documents and other papers and information as the
Issuing Bank may reasonably request. Upon receipt of any Application, the
Issuing Bank will process such Application and the certificates, documents and
other papers and information delivered to it in connection therewith in
accordance with its customary procedures and shall promptly issue the Letter of
Credit requested thereby (but in no event shall the Issuing Bank be required to
issue any Letter of Credit earlier than three Business Days after its receipt of
the Application therefor and all such other certificates, documents and other
papers and information relating thereto) by issuing the original of such Letter
of Credit to the beneficiary thereof or as otherwise may be agreed by the
Issuing Bank and the Borrower. The Issuing Bank shall furnish a copy of such
Letter of Credit to the Borrower promptly following the issuance thereof.

                  3.3 Participations and Payments in Respect of the Letters of
Credit. (a) The Issuing Bank irrevocably agrees to grant and hereby grants to
each L/C Participant, and, to induce the Issuing Bank to issue Letters of Credit
hereunder, each L/C Participant irrevocably agrees to accept and purchase and
hereby accepts and purchases from the Issuing Bank, on the terms and conditions
hereinafter stated, for such L/C Participant's own account and risk an undivided
interest equal to such L/C Participant's L/C Commitment Percentage in the
Issuing Bank's obligations and rights under each Letter of Credit issued
hereunder and the amount of each draft paid by the Issuing Bank thereunder.

                  (b) Each L/C Participant unconditionally and irrevocably
agrees with the Issuing Bank that, if a draft is paid under any Letter of Credit
for which the Issuing Bank is not reimbursed on the day of such payment in full
by the Borrower in immediately available funds, such Lender shall pay to the
Issuing Bank upon demand at the Issuing Bank's address for notices specified
herein an amount equal to such L/C Participant's L/C Commitment Percentage of
the amount of such draft, or any part thereof, which is not so reimbursed. Each
L/C Participant's obligation to make each such payment to the Issuing Bank, and
the Issuing Bank's right to receive the same, are absolute and unconditional and
shall not be affected by any circumstance whatsoever, including, without
limiting the effect of the foregoing, the occurrence or continuance of a Default
or Event of Default or the failure of any other L/C Participant to make any
payment



<PAGE>   32


                                                                              27

under this subsection, and each L/C Participant further agrees that each such
payment shall be made without any offset, abatement, withholding or reduction
whatsoever. Each L/C Participant shall indemnify and hold harmless the Issuing
Bank from and against any and all losses, liabilities (including, without
limitation, liabilities for penalties), actions, suits, judgments, demands,
costs and expenses (including reasonable attorneys' fees) resulting from any
failure of such L/C Participant to provide, or from any delay in providing, the
Issuing Bank with such L/C Participant's L/C Commitment Percentage of such
payment in accordance with the provisions of this subsection, but no L/C
Participant shall be so liable for any such failure on the part of any other L/C
Participant.

                  (c) If any amount required to be paid by any L/C Participant
to the Issuing Bank pursuant to subsection 3.3(a) in respect of any unreimbursed
portion of any payment made by the Issuing Bank under any Letter of Credit is
paid to the Issuing Bank within two Business Days after the date such payment is
due, such L/C Participant shall pay to the Issuing Bank on demand an amount
equal to the product of (i) such amount, times (ii) the daily average Federal
funds rate, as quoted by the Issuing Bank, during the period from and including
the date such payment is required to the date on which such payment is
immediately available to the Issuing Bank, times (iii) a fraction the numerator
of which is the number of days that elapse during such period and the
denominator of which is 360. If any such amount required to be paid by any L/C
Participant pursuant to subsection 3.3(a) is not in fact made available to the
Issuing Bank by such L/C Participant within two Business Days after the date
such payment is due, the Issuing Bank shall be entitled to recover from such L/C
Participant, on demand, such amount with interest thereon calculated from such
due date at the rate per annum applicable to Alternate Base Rate Loans
hereunder. A certificate of the Issuing Bank submitted to any L/C Participant
with respect to any amounts owing under this subsection shall be conclusive in
the absence of manifest error.

                  (d) Whenever, at any time after the Issuing Bank has made
payment under any Letter of Credit and has received from any L/C Participant its
pro rata share of such payment in accordance with subsection 3.3(a), the Issuing
Bank receives any payment related to such Letter of Credit (whether directly
from the Borrower or otherwise, including proceeds of collateral applied thereto
by the Issuing Bank), or any payment of interest on account thereof, the Issuing
Bank will distribute to such L/C Participant its pro rata share thereof;
provided, however, that in the event that any such payment received by the
Issuing Bank shall be required to be returned by the Issuing Bank, such L/C
Participant shall return to the Issuing Bank the portion thereof previously
distributed by the Issuing Bank to it.

                  3.4 Fees, Commissions and Other Charges. (a) The Borrower
shall pay to the Administrative Agent, for the account of the Issuing Bank, a
fronting fee with respect to each Letter of Credit for the period from and
including the date of issuance thereof to but not including the Expiry Date
thereof, computed at the rate of 1/8 of 1% per annum on the average daily amount
of the undrawn and unexpired amount of such Letter of Credit. Such fronting fee
shall be payable quarterly in advance on the date of issuance of each Letter of
Credit and on the last day of each March, June, September and December
thereafter. Such fee shall be nonrefundable.

                  (b) The Borrower shall pay to the Administrative Agent, for
the account of the Issuing Bank and the L/C Participants, a letter of credit
commission with respect to each Letter of



<PAGE>   33


                                                                              28

Credit for the period from and including the date of issuance thereof to but not
including the Expiry Date thereof, computed at the rate of the then Applicable
Margin for Eurodollar Loans per annum on the average daily amount of the undrawn
and unexpired amount of such Letter of Credit. Such commission shall be payable
to the L/C Participants to be shared ratably among them in accordance with their
respective L/C Commitment Percentages. Such commission shall be payable
quarterly in advance on the date of issuance of each Letter of Credit and on the
last day of each March, June, September and December thereafter. Such fee shall
be nonrefundable.

                  (c) In addition to the foregoing fees and commissions, the
Borrower shall pay or reimburse the Issuing Bank for such normal and customary
costs and expenses as are incurred or charged by the Issuing Bank in issuing,
effecting payment under, amending or otherwise administering any Letter of
Credit.

                  (d) The Administrative Agent shall, promptly following its
receipt thereof, distribute to the Issuing Bank and the L/C Participants all
fees and commissions received by the Administrative Agent for their respective
accounts pursuant to this subsection.

                  (e) The fees and commissions described in the preceding
paragraphs (a) and (b) shall be based on a 360 day year. If any amounts in the
preceding paragraphs (a) and (b) shall be payable on a day that is not a Working
Day, such amount shall be extended to the next succeeding Working Day unless the
result of such extension would be to carry such amount into another calendar
month in which event such amount shall be payable on the immediately preceding
Working Day.

                  3.5 Reimbursement Obligation of the Borrower. (a) The Borrower
agrees to reimburse the Issuing Bank on each date on which the Issuing Bank
notifies the Borrower of the date and amount of a draft presented under any
Letter of Credit and paid by the Issuing Bank for the amount of (i) such draft
so paid and (ii) any taxes, fees, charges or other costs or expenses incurred by
the Issuing Bank in connection with such payment. Each such payment shall be
made to the Issuing Bank at its address for notices specified herein in lawful
money of the United States of America and in immediately available funds.

                  (b) Unless otherwise notified by the Borrower, each drawing
under a Letter of Credit shall constitute a request by the Borrower to the
Administrative Agent for a borrowing pursuant to subsection 2.3 of Revolving
Credit Loans which are Alternate Base Rate Loans in the amount of such drawing,
subject to satisfaction of the conditions set forth in subsection 6.2. The
Borrowing Date with respect to such borrowing shall be the date of such drawing.

                  (c) Interest shall be payable on any and all amounts remaining
unpaid by the Borrower under this subsection from the date such amounts become
payable (whether at stated maturity, by acceleration or otherwise) until payment
in full at the rate which would be payable on any outstanding Alternate Base
Rate Loans which were then overdue.

                  3.6 Obligations Absolute. (a) The Borrower's obligations under
this Section 3 shall be absolute and unconditional under any and all
circumstances and irrespective of any set-off, counterclaim or defense to
payment which the Borrower may have or have had against the Issuing Bank or any
beneficiary of any Letter of Credit.



<PAGE>   34


                                                                              29

                  (b) The Borrower also agrees with the Issuing Bank that the
Issuing Bank shall not be responsible for, and the Borrower's Reimbursement
Obligations under subsection 3.5(a) shall not be affected by, among other
things, (i) the validity or genuineness of documents or of any endorsements
thereon, even though such documents shall in fact prove to be invalid,
fraudulent or forged, or (ii) any dispute between or among the Borrower and any
beneficiary of any Letter of Credit or any other party to which such Letter of
Credit may be transferred or (iii) any claims whatsoever of the Borrower against
any beneficiary of any Letter of Credit or any such transferee.

                  (c) The Issuing Bank shall not be liable for any error,
omission, interruption or delay in transmission, dispatch or delivery of any
message or advice, however transmitted, in connection with any Letter of Credit,
except for errors or omissions caused by the Issuing Bank's gross negligence or
willful misconduct.

                  (d) The Borrower agrees that any action taken or omitted by
the Issuing Bank under or in connection with any Letter of Credit or the related
drafts or documents, if done in the absence of gross negligence of willful
misconduct and in accordance with the standards of care specified in the Uniform
Commercial Code of the State of New York, shall be binding on the Borrower and
shall not result in any liability of the Issuing Bank to the Borrower.

                  3.7 Letter of Credit Payments. If any draft shall be presented
for payment under any Letter of Credit, the Issuing Bank shall promptly notify
the Borrower of the date and amount thereof. The responsibility of the Issuing
Bank to the Borrower in connection with any draft presented for payment under
any Letter of Credit shall, in addition to any payment obligation expressly
provided for in such Letter of Credit, be limited to determining that the
documents (including each draft) delivered under such Letter of Credit in
connection with such presentment are in conformity with such Letter of Credit.

                  3.8 Applications. To the extent that any provision of any
Application related to any Letter of Credit is inconsistent with the provisions
of this Section 3, the provisions of this Section 3 shall apply.


                  SECTION 4.  GENERAL PROVISIONS FOR LOANS

                  4.1 Optional and Mandatory Prepayments. (a) The Borrower may
on the last day of any Interest Period with respect thereto, in the case of
Eurodollar Loans, or at any time and from time to time, in the case of Alternate
Base Rate Loans, prepay the Revolving Credit Loans, in whole or in part, without
premium or penalty, upon at least four Business Days' irrevocable notice to the
Administrative Agent, specifying the date and amount of prepayment and whether
the prepayment is of Eurodollar Loans, Alternate Base Rate Loans or a
combination thereof, and, if of a combination thereof, the amount allocable to
each. Upon receipt of any such notice the Administrative Agent shall promptly
notify each Lender thereof. If any such notice is given, the amount specified in
such notice shall be due and payable on the date specified therein. Partial
prepayments shall be in an aggregate principal amount of $1,000,000 or a whole
multiple thereof.




<PAGE>   35


                                                                              30

                  (b) If on any date (including any date on which a certificate
of a Responsible Officer of the Borrower is delivered pursuant to subsection
7.2(b)) the sum of the Aggregate Outstanding Revolving Credit Extensions of
Credit then outstanding exceeds the lesser of (i) the then aggregate Revolving
Credit Commitments or (ii) the then applicable Incurrence Limitation, then,
without notice or demand, the Borrower shall, no later than 15 days following
such date, prepay the Revolving Credit Loans in an amount equal to such excess.
The Borrower may, subject to the terms and conditions of this Agreement,
reborrow the amount of any prepayment made under subsection 4.1(c).

                  (c) The application of any prepayment pursuant to subsections
4.1(b) shall be made first to Alternate Base Rate Loans and second to Eurodollar
Loans. Each prepayment of the Loans under subsections 4.1(b) (other than
Alternate Base Rate Loans) shall be accompanied by accrued interest to the date
of such prepayment on the amount prepaid.

                  4.2 Conversion and Continuation Options. (a) The Borrower may
elect from time to time to convert Eurodollar Loans to Alternate Base Rate Loans
by giving the Administrative Agent at least two Business Days' prior irrevocable
notice of such election, provided that any such conversion of Eurodollar Loans
may only be made on the last day of an Interest Period with respect thereto. The
Borrower may elect from time to time to convert Alternate Base Rate Loans to
Eurodollar Loans by giving the Administrative Agent at least three Working Days'
prior irrevocable notice of such election. Any such notice of conversion to
Eurodollar Loans shall specify the length of the initial Interest Period or
Interest Periods therefor. Upon receipt of any such notice the Administrative
Agent shall promptly notify each Lender thereof. All or any part of outstanding
Eurodollar Loans and Alternate Base Rate Loans may be converted as provided
herein, provided that (i) no Revolving Credit Loan may be converted into a
Eurodollar Loan when any Default or Event of Default has occurred and is
continuing and the Administrative Agent has or the Required Lenders have
determined that such a conversion is not appropriate, (ii) any such conversion
may only be made if, after giving effect thereto, subsection 4.3 shall not have
been contravened and (iii) no Revolving Credit Loan may be converted into a
Eurodollar Loan after the date that is one month prior to the Revolving Credit
Termination Date.

                  (b) Any Eurodollar Loans may be continued as such upon the
expiration of the then current Interest Period with respect thereto by the
Borrower giving notice to the Administrative Agent, in accordance with the
applicable provisions of the term "Interest Period" set forth in subsection 1.1,
of the length of the next Interest Period to be applicable to such Revolving
Credit Loans, provided that no Eurodollar Loan may be continued as such (i) when
any Default or Event of Default has occurred and is continuing and the
Administrative Agent has or the Required Lenders have determined that such a
continuation is not appropriate, (ii) if, after giving effect thereto,
subsection 4.3 would be contravened or (iii) after the date that is one month
prior to the Revolving Credit Termination Date and provided, further, that if
the Borrower shall fail to give any required notice as described above in this
paragraph or if such continuation is not permitted pursuant to the preceding
proviso such Revolving Credit Loans shall be automatically converted to
Alternate Base Rate Loans on the last day of such then expiring Interest Period.

                  4.3 Minimum Amounts of Tranches. All borrowings, conversions
and continuations of Revolving Credit Loans hereunder and all selections of
Interest Periods hereunder shall be in such amounts and be made pursuant to such
elections so that, after giving



<PAGE>   36


                                                                              31

effect thereto, (a) the aggregate principal amount of the Revolving Credit Loans
comprising each Tranche shall be equal to $2,000,000 or a whole multiple of
$100,000 in excess thereof, and (b) the number of Tranches then outstanding
shall not exceed eight.

                  4.4 Interest Rates and Payment Dates. (a) Each Eurodollar Loan
shall bear interest for each day during each Interest Period with respect
thereto at a rate per annum equal to the Eurodollar Rate determined for such day
plus the Applicable Margin.

                  (b) Each Alternate Base Rate Loan shall bear interest at a
rate per annum equal to the Alternate Base Rate plus the Applicable Margin.

                  (c) If all or a portion of (i) the principal amount of any
Revolving Credit Loan, (ii) any interest payable thereon or (iii) any commitment
fee or other amount payable hereunder shall not be paid when due (whether at the
stated maturity, by acceleration or otherwise), such overdue amount shall bear
interest at a rate per annum which is the higher of (A) the rate that would
otherwise be applicable thereto pursuant to the foregoing provisions of this
subsection plus 2% and (B) the Alternate Base Rate plus 1%, in each case from
the date of such non-payment until such amount is paid in full (as well after as
before judgment).

                  (d) Interest shall be payable in arrears on each Interest
Payment Date, provided that interest accruing pursuant to paragraph (c) of this
subsection shall be payable from time to time on demand.

                  4.5 Computation of Interest and Fees. (a) Interest on
Alternate Base Rate Loans, commitment fees and interest on overdue interest,
commitment fees and other amounts payable hereunder shall be calculated on the
basis of a 365- (or 366-, as the case may be) day year for the actual days
elapsed. Interest on Eurodollar Loans shall be calculated on the basis of a
360-day year for the actual days elapsed. The Administrative Agent shall as soon
as practicable notify the Borrower and the Lenders of each determination of a
Eurodollar Rate. Any change in the interest rate on a Loan resulting from a
change in the Alternate Base Rate or the Eurocurrency Reserve Requirements shall
become effective as of the opening of business on the day on which such change
becomes effective. The Administrative Agent shall as soon as practicable notify
the Borrower and the Lenders of the effective date and the amount of each such
change in interest rate.

                  (b) Each determination of an interest rate by the
Administrative Agent pursuant to any provision of this Agreement shall be
conclusive and binding on the Borrower and the Lenders in the absence of
manifest error. The Administrative Agent shall, at the request of the Borrower,
deliver to the Borrower a statement showing the quotations used by the
Administrative Agent in determining any interest rate pursuant to subsection
4.4(a).

                  4.6 Inability to Determine Interest Rate. If prior to the
first day of any Interest Period:

                  (a) the Administrative Agent shall have determined (which
         determination shall be conclusive and binding upon the Borrower) that,
         by reason of circumstances affecting the



<PAGE>   37


                                                                              32

         relevant market, adequate and reasonable means do not exist for
         ascertaining the Eurodollar Rate for such Interest Period, or

                  (b) the Administrative Agent shall have received notice from
         the Required Lenders that the Eurodollar Rate determined or to be
         determined for such Interest Period will not adequately and fairly
         reflect the cost to such Lenders (as conclusively certified by such
         Lenders) of making or maintaining their affected Revolving Credit Loans
         during such Interest Period,

the Administrative Agent shall give telecopy or telephonic notice thereof to the
Borrower and the Lenders as soon as practicable thereafter. If such notice is
given (x) any Eurodollar Loans requested to be made on the first day of such
Interest Period shall be made as Alternate Base Rate Loans, (y) any Revolving
Credit Loans that were to have been converted on the first day of such Interest
Period to Eurodollar Loans shall be converted to or continued as Alternate Base
Rate Loans and (z) any outstanding Eurodollar Loans shall be converted, on the
first day of such Interest Period, to Alternate Base Rate Loans. Until such
notice has been withdrawn by the Administrative Agent, no further Eurodollar
Loans shall be made or continued as such, nor shall the Borrower have the right
to convert Revolving Credit Loans to Eurodollar Loans.

                  4.7 Pro Rata Treatment and Payments. (a) Each borrowing by the
Borrower from the Lenders hereunder, each payment by the Borrower on account of
any commitment fee hereunder and any reduction of the Revolving Credit
Commitments of the Lenders shall be made pro rata according to the respective
Commitment Percentages of the Lenders. Each payment (including each prepayment)
by the Borrower on account of principal of and interest on the Revolving Credit
Loans shall be made pro rata according to the respective outstanding principal
amounts of the Revolving Credit Loans then held by the Lenders. All payments
(including prepayments) to be made by the Borrower hereunder and under the
Revolving Credit Notes, whether on account of principal, interest, fees or
otherwise, shall be made without set off or counterclaim and shall be made prior
to 12:00 Noon, New York City time, on the due date thereof to the Administrative
Agent, for the account of the Lenders, at the Administrative Agent's office
specified in subsection 11.2, in Dollars and in immediately available funds. The
Administrative Agent shall distribute such payments to the Lenders promptly upon
receipt in like funds as received. If any payment hereunder (other than payments
on the Eurodollar Loans) becomes due and payable on a day other than a Business
Day, such payment shall be extended to the next succeeding Business Day, and,
with respect to payments of principal, interest thereon shall be payable at the
then applicable rate during such extension and with respect to payments of fees,
such fees accruing during such extension shall be payable on the next succeeding
Business Day. If any payment on a Eurodollar Loan becomes due and payable on a
day other than a Working Day, the maturity thereof shall be extended to the next
succeeding Working Day unless the result of such extension would be to extend
such payment into another calendar month, in which event such payment shall be
made on the immediately preceding Working Day.

                  (b) Unless the Administrative Agent shall have been notified
in writing by any Lender prior to a Borrowing Date that such Lender will not
make the amount that would constitute its Commitment Percentage of the borrowing
on such date available to the Administrative Agent, the Administrative Agent may
assume that such Lender has made such amount available to the Administrative
Agent on such Borrowing Date, and the Administrative



<PAGE>   38


                                                                              33

Agent may, in reliance upon such assumption, make available to the Borrower a
corresponding amount. If such amount is made available to the Administrative
Agent on a date after such Borrowing Date, such Lender shall pay to the
Administrative Agent on demand an amount equal to the product of (i) the daily
average Federal Funds Effective Rate during such period, times (ii) the amount
of such Lender's Commitment Percentage of such borrowing, times (iii) a fraction
the numerator of which is the number of days that elapse from and including such
Borrowing Date to the date on which such Lender's Commitment Percentage of such
borrowing shall have become immediately available to the Administrative Agent
and the denominator of which is 360. A certificate of the Administrative Agent
submitted to any Lender with respect to any amounts owing under this subsection
shall be conclusive in the absence of manifest error. If such Lender's
Commitment Percentage of such borrowing is not in fact made available to the
Administrative Agent by such Lender within three Business Days of such Borrowing
Date, the Administrative Agent shall be entitled to recover such amount with
interest thereon at the rate per annum applicable to Alternate Base Rate Loans
hereunder, on demand, from the Borrower.

                  4.8 Illegality. Notwithstanding any other provision herein, if
the adoption of or any change in any Requirement of Law or in the interpretation
or application thereof shall make it unlawful for any Lender to make or maintain
Eurodollar Loans as contemplated by this Agreement, (a) the commitment of such
Lender hereunder to make Eurodollar Loans, continue Eurodollar Loans as such and
convert Alternate Base Rate Loans to Eurodollar Loans shall forthwith be
cancelled and (b) such Lender's Revolving Credit Loans then outstanding as
Eurodollar Loans, if any, shall be converted automatically to Alternate Base
Rate Loans on the respective last days of the then current Interest Periods with
respect to such Revolving Credit Loans or within such earlier period as required
by law. If any such conversion of a Eurodollar Loan occurs on a day which is not
the last day of the then current Interest Period with respect thereto, the
Borrower shall pay to such Lender such amounts, if any, as may be required
pursuant to subsection 4.11.

                  4.9 Requirements of Law. (a) If the adoption of or any change
in any Requirement of Law or in the interpretation or application thereof or
compliance by any Lender with any request or directive (whether or not having
the force of law) from any central bank or other Governmental Authority made
subsequent to the date hereof:

                  (i) shall subject any Lender to any tax of any kind whatsoever
         with respect to this Agreement, any Revolving Credit Note, any Letter
         of Credit, any Application or any Eurodollar Loan made by it, or change
         the basis of taxation of payments to such Lender in respect thereof
         (except for taxes covered by subsection 4.10 and changes in the rate of
         tax on the overall net income of such Lender);

                  (ii) shall impose, modify or hold applicable any reserve,
         special deposit, compulsory loan or similar requirement against assets
         held by, deposits or other liabilities in or for the account of,
         advances, loans or other extensions of credit by, or any other
         acquisition of funds by, any office of such Lender which is not
         otherwise included in the determination of the Eurodollar Rate
         hereunder; or

                  (iii) shall impose on such Lender any other condition;




<PAGE>   39


                                                                              34

and the result of any of the foregoing is to increase the cost to such Lender,
by an amount which such Lender deems to be material, of making, converting into,
continuing or maintaining Eurodollar Loans or issuing or participating in the
Letters of Credit or to reduce any amount receivable hereunder in respect
thereof, then, in any such case, the Borrower shall promptly pay such Lender,
upon its demand, any additional amounts necessary to compensate such Lender for
such increased cost or reduced amount receivable. If any Lender becomes entitled
to claim any additional amounts pursuant to this subsection, it shall promptly
notify the Borrower, through the Administrative Agent, of the event by reason of
which it has become so entitled. A certificate as to any additional amounts
payable pursuant to this subsection submitted by such Lender, through the
Administrative Agent, to the Borrower shall be conclusive in the absence of
manifest error. This covenant shall survive the termination of this Agreement
and the payment of the Revolving Credit Notes and all other amounts payable
hereunder.

                  (b) If any Lender shall have determined that the adoption of
or any change in any Requirement of Law regarding capital adequacy or in the
interpretation or application thereof or compliance by such Lender or any
corporation controlling such Lender with any request or directive regarding
capital adequacy (whether or not having the force of law) from any Governmental
Authority made subsequent to the date hereof does or shall have the effect of
reducing the rate of return on such Lender's or such corporation's capital as a
consequence of its obligations hereunder or under any Letter of Credit to a
level below that which such Lender or such corporation could have achieved but
for such change or compliance (taking into consideration such Lender's or such
corporation's policies with respect to capital adequacy) by an amount deemed by
such Lender to be material, then from time to time, after submission by such
Lender to the Borrower (with a copy to the Administrative Agent) of a written
request therefor, the Borrower shall pay to such Lender such additional amount
or amounts as will compensate such Lender for such reduction.

                  4.10 Taxes. (a) All payments made by the Borrower under this
Agreement and the Revolving Credit Notes shall be made free and clear of, and
without deduction or withholding for or on account of, any present or future
income, stamp or other taxes, levies, imposts, duties, charges, fees, deductions
or withholdings, now or hereafter imposed, levied, collected, withheld or
assessed by any Governmental Authority, excluding, in the case of the
Administrative Agent and each Lender, net income taxes and franchise taxes
(imposed in lieu of net income taxes) imposed on the Administrative Agent or
such Lender, as the case may be, as a result of a present or former connection
between the jurisdiction of the government or taxing authority imposing such tax
and the Administrative Agent or such Lender (excluding a connection arising
solely from the Administrative Agent or such Lender having executed, delivered
or performed its obligations or received a payment under, or enforced, this
Agreement or the Revolving Credit Notes) or any political subdivision or taxing
authority thereof or therein (all such non-excluded taxes, levies, imposts,
duties, charges, fees, deductions and withholdings being hereinafter called
"Taxes"). If any Taxes are required to be withheld from any amounts payable to
the Administrative Agent or any Lender hereunder or under the Revolving Credit
Notes, the amounts so payable to the Administrative Agent or such Lender shall
be increased to the extent necessary to yield to the Administrative Agent or
such Lender (after payment of all Taxes) interest or any such other amounts
payable hereunder at the rates or in the amounts specified in this Agreement and
the Revolving Credit Notes. Whenever any Taxes are payable by the Borrower, as
promptly as possible thereafter the Borrower shall send to the Administrative



<PAGE>   40


                                                                              35

Agent for its own account or for the account of such Lender, as the case may be,
a certified copy of an original official receipt received by the Borrower
showing payment thereof. If the Borrower fails to pay any Taxes when due to the
appropriate taxing authority or fails to remit to the Administrative Agent the
required receipts or other required documentary evidence, the Borrower shall
indemnify the Administrative Agent and the Lenders for any incremental taxes,
interest or penalties that may become payable by the Administrative Agent or any
Lender as a result of any such failure. The agreements in this subsection shall
survive the termination of this Agreement and the payment of the Revolving
Credit Notes and all other amounts payable hereunder.

                  (b) Each Lender that is not incorporated under the laws of the
United States of America or a state thereof shall:

                           (i) deliver to the Borrower and the Administrative
         Agent (A) two duly completed copies of United States Internal Revenue
         Service Form 1001 or 4224, or successor applicable form, as the case
         may be, and (B) an Internal Revenue Service Form W-8 or W-9, or
         successor applicable form, as the case may be;

                           (ii) deliver to the Borrower and the Administrative
         Agent two further copies of any such form or certification on or before
         the date that any such form or certification expires or becomes
         obsolete and after the occurrence of any event requiring a change in
         the most recent form previously delivered by it to the Borrower; and

                           (iii) obtain such extensions of time for filing and
         complete such forms or certifications as may reasonably be requested by
         the Borrower or the Administrative Agent;

unless in any such case an event (including, without limitation, any change in
treaty, law or regulation) has occurred prior to the date on which any such
delivery would otherwise be required which renders all such forms inapplicable
or which would prevent such Lender from duly completing and delivering any such
form with respect to it and such Lender so advises the Borrower and the
Administrative Agent. Such Lender shall certify (i) in the case of a Form 1001
or 4224, that it is entitled to receive payments under this Agreement without
deduction or withholding of any United States federal income taxes and (ii) in
the case of a Form W-8 or W-9, that it is entitled to an exemption from United
States backup withholding tax. Each Person that shall become a Lender or a
Participant pursuant to subsection 11.6 shall, upon the effectiveness of the
related transfer, be required to provide all of the forms and statements
required pursuant to this subsection, provided that in the case of a Participant
such Participant shall furnish all such required forms and statements to the
Lender from which the related participation shall have been purchased.

                  4.11 Indemnity. The Borrower agrees to indemnify each Lender
and to hold each Lender harmless from any loss or expense which such Lender may
sustain or incur as a consequence of (a) default by the Borrower in payment when
due of the principal amount of or interest on any Eurodollar Loan, (b) default
by the Borrower in making a borrowing of, conversion into or continuation of
Eurodollar Loans after the Borrower has given a notice requesting the same in
accordance with the provisions of this Agreement, (c) default by the



<PAGE>   41


                                                                              36

Borrower in making any prepayment after the Borrower has given a notice thereof
in accordance with the provisions of this Agreement or (d) the making of a
prepayment of Eurodollar Loans on a day which is not the last day of an Interest
Period with respect thereto, including, without limitation, in each case, any
such loss or expense arising from the reemployment of funds obtained by it or
from fees payable to terminate the deposits from which such funds were obtained.
This covenant shall survive the termination of this Agreement and the payment of
the Revolving Credit Notes and all other amounts payable hereunder.

                  4.12 Lenders Obligation to Mitigate. Each Lender agrees that,
as promptly as practicable after it becomes aware that it has been or will be
affected by the occurrence of an event or the existence of a condition described
under subsection 4.8, 4.9(a) or 4.10(a), it will, to the extent not inconsistent
with such Lender's internal policies, use its best efforts (a) to provide
written notice to the Borrower describing such condition and the anticipated
effect thereof and (b) to make, fund or maintain the affected Eurodollar Loans
of such Lender through another lending office of such Lender if as a result
thereof the additional moneys which would otherwise be required to be paid in
respect of such Revolving Credit Loans pursuant to subsection 4.8, 4.9 or
4.10(a) would be materially reduced or the illegality or other adverse
circumstances which would otherwise require such payment pursuant to subsection
4.8, 4.9(a) or 4.10(a) would cease to exist and if, as determined by such
Lender, in its sole discretion, the making, funding or maintaining of such
Revolving Credit Loans through such other lending office would not otherwise
adversely affect such Revolving Credit Loans or such Lender. The Borrower hereby
agrees to pay all reasonable expenses incurred by any Lender in utilizing
another lending office of such Lender pursuant to this subsection 4.12.

                  4.13 Certain Permitted Transactions. Notwithstanding any
provision in the Loan Documents and without increasing the obligations of the
Lenders under Sections 2 and 3 of this Agreement, the Borrower and its
Subsidiaries shall have the right to consummate any of the following
transactions:

                  (a) Viosca Knoll Transactions. The acquisition of additional
interests in Viosca Knoll and other related transactions described in the Proxy
Statement of the Borrower dated February 8, 1999, including, but not limited to:

                           (i)      acquisition by the Borrower of E1 Paso
                                    Energy's 49% interest in Viosca Knoll;

                           (ii)     payment in full of Viosca Knoll's revolving
                                    credit facility;

                           (iii)    amendment of the Partnership Agreement; and

                           (iv)     exercise by the Borrower of the option to
                                    purchase El Paso Energy's remaining 1%
                                    interest in Viosca Knoll;

                  (b) NGPL Transactions. (i) The acquisition by the Borrower
from Natural Gas Pipeline Company of America ("NGPL") of, and the assumption by
Borrower of obligations with respect to, (x) NGPL's interest in Western Gulf,
(y) NGPL's interest in UTOS and (z) certain of NGPL's offshore pipeline
laterals, and (ii) the reorganization of Stingray Pipeline Company, a



<PAGE>   42


                                                                              37

Delaware partnership, into a limited liability company; provided that
immediately prior to and immediatly following the transactions described in the
preceding clauses (i) and (ii), no Default or Event of Default has occurred and
is continuing and provided further that immediately after giving effect to any
such transaction, the Borrower would be in pro forma compliance with the
covenants set forth in subsection 8.1; and

                  (c) HIOS Reorganization. (i) The reorganization of High Island
Offshore System, a Delaware partnership, into a limited liability company, (ii)
the creation of Western Gulf and East Breaks and (iii) the capital contributions
contemplated by the Limited Liability Company Agreement of Western Gulf dated as
of December 11, 1998, including, without limitation, contribution of TOGT's and
TOPC's interests in High Island Offshore System, L.L.C., the converted
partnership.

                  4.14  Certain Adjustments.

                  (a) Acquisition; Redesignation. If the Borrower or any of its
Restricted Subsidiaries acquires any Acquired Business or there is a
Redesignation of any Subsidiary during any Calculation Period, Consolidated
EBITDA for such Calculation Period will be determined on a pro forma basis as if
such Acquired Business were acquired, or such Redesignation occurred, on the
first day thereof. Such pro forma adjustments will be subject to delivery to the
Administrative Agent of a certificate of a Responsible Officer of the Borrower.
Such certificate may be delivered at any time with respect to any Redesignation
and at any time after the last day of the first fiscal quarter of the Borrower
to end after the related acquisition date with respect to any Acquired Business.
Each such certificate shall be accompanied by supporting information and
calculations with respect to each Acquired Business or Redesignation and such
other information as any Lender, through the Administrative Agent, may
reasonably request.

                  (b) Viosca Knoll. After the date on which Viosca Knoll has
become a Subsidiary, financial measurements under this Agreement for periods
prior to such date shall be calculated as if Viosca Knoll was a Subsidiary and a
Restricted Subsidiary during the applicable prior period.

                  4.15 Redesignated Senior Indebtedness. The Borrower and the
Co-Borrower hereby designate all Obligations of the Borrower and its
Subsidiaries (including the Co-Borrower) under this Agreement and the other Loan
Documents as Designated Senior Indebtedness, as such term is defined in the
Senior Subordinated Note Indenture.


                  SECTION 5.  REPRESENTATIONS AND WARRANTIES

                  To induce the Administrative Agent and the Lenders to enter
into this Agreement and to make the Revolving Credit Loans and issue or
participate in the Letters of Credit, the Borrower hereby represents and
warrants to the Administrative Agent and each Lender that:

                  5.1 Financial Condition. The consolidated balance sheet of the
Borrower and its consolidated Subsidiaries as at December 31, 1998, and the
related consolidated statements of operations and of cash flows for the fiscal
year ended December 31, 1998, reported on by



<PAGE>   43


                                                                              38

PricewaterhouseCoopers LLP, copies of which have heretofore been furnished to
each Lender, present fairly the consolidated financial condition of the Borrower
and its consolidated Subsidiaries as at such date, and the consolidated results
of their operations and their consolidated cash flows for the year then ended.
The consolidated balance sheet of the Borrower and its consolidated Subsidiaries
as at March 31, 1999 and the related consolidated statements of operations and
of cash flows for the three months ended March 31, 1999, copies of which have
heretofore been furnished to each Lender, present fairly the consolidated
financial condition of the Borrower and its consolidated Subsidiaries as at each
such date, and the consolidated results of their operations and their
consolidated cash flows for the three-month period then ended. All such
financial statements, including the related schedules and notes thereto, have
been prepared in accordance with GAAP applied consistently throughout the
periods involved (except as approved by such accountants and as disclosed
therein and, with respect to the March 31, 1999 financial statements, for the
absence of footnotes and year-end adjustments). Except as set forth on Schedule
5.1 or as permitted by subsection 8.4(c), neither the Borrower nor any of its
consolidated Subsidiaries had, at the date of the most recent balance sheet
referred to above, any material Guarantee Obligation, contingent liability or
liability for taxes, or any long-term lease or unusual forward or long-term
commitment, including, without limitation, any interest rate or foreign currency
swap or exchange transaction, which is not reflected in the foregoing statements
or in the notes thereto. Except as set forth on Schedule 5.1, during the period
from March 31, 1999 to and including the Closing Date there has been no sale,
transfer or other disposition by the Borrower or any of its consolidated
Subsidiaries of any material part of its business or property and no purchase or
other acquisition of any business or property (including any capital stock of
any other Person) material in relation to the consolidated financial condition
of the Borrower and its consolidated Subsidiaries at March 31, 1999.

                  5.2 No Change. Since December 31, 1998 (a) there has been no
development or event which has had or could reasonably be expected to have a
Material Adverse Effect and (b) no dividends or other distributions have been
declared, paid or made upon the Capital Stock of the Borrower except as
permitted by subsection 8.7, nor has any of the Capital Stock of the Borrower
been redeemed, retired, purchased or otherwise acquired for value by the
Borrower or any of its Subsidiaries.

                  5.3 Existence; Compliance with Law. Each of the Borrower and
its Subsidiaries (a) is duly organized, validly existing and in good standing
under the laws of the jurisdiction of its organization, (b) has the power and
authority, and the legal right, to own and operate its property, to lease the
property it operates as lessee and to conduct the business in which it is
currently engaged, (c) is duly qualified as a foreign corporation, limited
partnership or limited liability company, as the case may be, and, where
applicable, in good standing under the laws of each jurisdiction where its
ownership, lease or operation of property or the conduct of its business
requires such qualification and (d) is in compliance with all Requirements of
Law except to the extent that the failure to comply therewith could not, in the
aggregate, reasonably be expected to have a Material Adverse Effect.

                  5.4 Power; Authorization; Enforceable Obligations. (a) The
Borrower has the power and authority, and the legal right, to make, deliver and
perform this Agreement, the Revolving Credit Notes and the other Loan Documents
to which it is a party and to borrow hereunder and has taken all necessary
action to authorize the borrowings on the terms and



<PAGE>   44


                                                                              39

conditions of this Agreement and the Revolving Credit Notes and to authorize the
execution, delivery and performance of this Agreement, the Revolving Credit
Notes and the other Loan Documents to which it is a party. No consent or
authorization of, filing with, notice to or other act by or in respect of, any
Governmental Authority or any other Person is required in connection with the
borrowings hereunder or with the execution, delivery, performance, validity or
enforceability of this Agreement or the Revolving Credit Notes or the
Applications. This Agreement has been, and each Revolving Credit Note and the
Applications will be, duly executed and delivered on behalf of the Borrower.
This Agreement constitutes, and each Revolving Credit Note and each other Loan
Document to which the Borrower is a party when executed and delivered will
constitute, a legal, valid and binding obligation of the Borrower enforceable
against the Borrower in accordance with its terms, except as enforceability may
be limited by applicable bankruptcy, insolvency, reorganization, moratorium or
similar laws affecting the enforcement of creditors' rights generally and by
general equitable principles (whether enforcement is sought by proceedings in
equity or at law).

                  (b) Each of the Subsidiary Guarantors has the power and
authority, and the legal right, to make, deliver and perform the Loan Documents
to which it is a party and has taken all necessary action to authorize the
execution, delivery and performance of the Loan Documents to which it is a
party. No consent or authorization of, filing with, notice to or other act by or
in respect of, any Governmental Authority or any other Person is required in
connection with the borrowings hereunder or with the execution, delivery,
performance, validity or enforceability of the Loan Documents to which such
Subsidiary Guarantor is a party. Each of the Loan Documents to which such
Subsidiary Guarantor is a party will be duly executed and delivered on behalf of
such Subsidiary Guarantor. Each Loan Document to which such Subsidiary Guarantor
is a party will, when executed and delivered, constitute a legal, valid and
binding obligation of such Subsidiary Guarantor enforceable against such
Subsidiary Guarantor in accordance with its terms, except as enforceability may
be limited by applicable bankruptcy, insolvency, reorganization, moratorium or
similar laws affecting the enforcement of creditors' rights generally and by
general equitable principles (whether enforcement is sought by proceedings in
equity or at law).

                  5.5 No Legal Bar. The execution, delivery and performance of
this Agreement, the Revolving Credit Notes and the other Loan Documents, the
borrowings hereunder and the use of the proceeds thereof will not violate any
Requirement of Law or Contractual Obligation of any Loan Party, or, to the best
knowledge of the Borrower, any Joint Venture any of the interests in which is
owned by a Restricted Subsidiary, and will not result in, or require, the
creation or imposition of any Lien on any of their respective properties or
revenues pursuant to any such Requirement of Law or Contractual Obligation.

                  5.6 No Material Litigation. Except as set forth on Schedule
5.6, no litigation, investigation or proceeding of or before any arbitrator or
Governmental Authority is pending or, to the knowledge of the Borrower,
threatened by or against the Borrower or any of its Subsidiaries, or, to the
best knowledge of the Borrower, any Joint Venture any of the interests in which
is owned by a Restricted Subsidiary, or against any of its or their respective
properties or revenues (a) with respect to this Agreement, the Revolving Credit
Notes or any of the other Loan Documents or any of the transactions contemplated
hereby or thereby, or (b) which could reasonably be expected to have a Material
Adverse Effect.



<PAGE>   45


                                                                              40

                  5.7 No Default. No Loan Party, and, to the best knowledge of
the Borrower, no Joint Venture any of the interests in which is owned by a
Restricted Subsidiary, is in default under or with respect to any of its
Contractual Obligations in any respect which could reasonably be expected to
have a Material Adverse Effect. No Default or Event of Default has occurred and
is continuing.

                  5.8 Ownership of Property; Liens. Each of the Borrower and its
Restricted Subsidiaries has good record and marketable title in fee simple to,
or a valid leasehold interest in, all its real property necessary for its
operations as then conducted, and good title to, or a valid leasehold interest
in, all its other property, and none of such property necessary for its
operations as then conducted is subject to any Lien except as permitted by
subsection 8.3.

                  5.9 Intellectual Property. The Borrower and each of its
Restricted Subsidiaries owns, or is licensed to use, all trademarks, tradenames,
copyrights, technology, know-how and processes necessary for the conduct of its
business as currently conducted except for those the failure to own or license
which could not have a Material Adverse Effect (the "Intellectual Property"). No
claim has been asserted and is pending by any Person challenging or questioning
the use of any such Intellectual Property or the validity or effectiveness of
any such Intellectual Property, nor does the Borrower know of any valid basis
for any such claim. The use of such Intellectual Property by the Borrower and
its Restricted Subsidiaries does not infringe on the rights of any Person,
except for such claims and infringements that, in the aggregate, do not have a
Material Adverse Effect.

                  5.10 No Burdensome Restrictions. The Borrower, in good faith,
does not believe any Requirement of Law or Contractual Obligation of the
Borrower or any of its Restricted Subsidiaries could reasonably be expected to
have a Material Adverse Effect.

                  5.11 Taxes. Each of the Borrower and its Subsidiaries has
filed or caused to be filed all tax returns which, to the knowledge of the
Borrower, are required to be filed and has paid all taxes shown to be due and
payable on said returns or on any assessments made against it or any of its
property and all other taxes, fees or other charges imposed on it or any of its
property by any Governmental Authority (other than any the amount or validity of
which are currently being contested in good faith by appropriate proceedings and
with respect to which reserves in conformity with GAAP have been provided on the
books of the Borrower or its Subsidiaries, as the case may be); no tax Lien has
been filed, and, to the knowledge of the Borrower, no claim is being asserted,
with respect to any such tax, fee or other charge.

                  5.12 Federal Regulations. No part of the proceeds of any
Revolving Credit Loans will be used for "purchasing" or "carrying" any "margin
stock" within the respective meanings of each of the quoted terms under
Regulation U of the Board of Governors of the Federal Reserve System as now and
from time to time hereafter in effect or for any purpose which violates the
provisions of the Regulations of such Board of Governors. If requested by any
Lender or the Administrative Agent, the Borrower will furnish to the
Administrative Agent and each Lender a statement to the foregoing effect in
conformity with the requirements of FR Form U-1 referred to in said Regulation
U.




<PAGE>   46


                                                                              41

                  5.13 ERISA. No Loan Party has or is a party to, or has any
matured or contingent obligations under, any Plans.

                  5.14 Investment Company Act; Other Regulations. The Borrower
is not an "investment company", or a company "controlled" by an "investment
company", within the meaning of the Investment Company Act of 1940, as amended.
The Borrower is not subject to regulation under any Federal or State statute or
regulation which limits its ability to incur Indebtedness.

                  5.15 Subsidiaries. The Persons set forth on Schedule 5.15
constitute all of the Subsidiaries of the Borrower, and all Joint Ventures in
which the Borrower owns any interest, as of the Closing Date, and the percentage
of the equity interests owned by the Borrower in each such Person as of such
date. Each of the Subsidiaries listed on Schedule 5.15 is as of the Closing Date
a Restricted Subsidiary.

                  5.16 Purpose of Revolving Credit Loans, Letters of Credit. The
proceeds of the Revolving Credit Loans shall be used by the Borrower (a) to
refinance Indebtedness under the Existing Credit Agreement and (b) for general
corporate purposes. The Letters of Credit shall be used for the purposes
described in subsection 3.1(b).

                  5.17 Environmental Matters. Except as set forth on Schedule
5.17:

                  (a) To the best knowledge of the Borrower, the Properties do
         not contain, and have not previously contained, any Materials of
         Environmental Concern in amounts or concentrations which (i) constitute
         or constituted a violation of, or (ii) give rise to liability under,
         any Environmental Law, except in either case insofar as such violation
         or liability, or any aggregation thereof, could not reasonably be
         expected to result in the payment of a Material Environmental Amount.

                  (b) To the best knowledge of the Borrower, the Properties and
         all operations at the Properties are in compliance, and have in the
         period commencing six months prior to the date hereof been in
         compliance, in all material respects with all applicable Environmental
         Laws, and there is no contamination at, under or about the Properties
         or violation of any Environmental Law with respect to the Properties or
         the business operated by the Borrower or any of its Subsidiaries or any
         Joint Venture (the "Business") which could materially interfere with
         the continued operation of any material Property or which could
         reasonably be expected to have a Material Adverse Effect.

                  (c) Neither the Borrower nor any of its Subsidiaries nor, to
         the best knowledge of the Borrower or any Joint Venture, has received
         any notice of violation, alleged violation, non-compliance, liability
         or potential liability regarding environmental matters or compliance
         with Environmental Laws with regard to any of the Properties or the
         Business, nor does the Borrower have knowledge or reason to believe
         that any such notice will be received or is being threatened except
         insofar as such notice or threatened notice, or any aggregation
         thereof, does not involve a matter or matters that is or could
         reasonably be expected to result in the payment of a Material
         Environmental Amount.




<PAGE>   47


                                                                              42

                  (d) To the best knowledge of the Borrower, Materials of
         Environmental Concern have not been transported or disposed of from the
         Properties in violation of, or in a manner or to a location which could
         reasonably be expected to give rise to liability under, any
         Environmental Law, nor have any Materials of Environmental Concern been
         generated, treated, stored or disposed of at, on or under any of the
         Properties in violation of, or in a manner that could reasonably be
         expected to give rise to liability under, any applicable Environmental
         Law except insofar as any such violation or liability referred to in
         this paragraph, or any aggregation thereof, could not reasonably be
         expected to result in the payment of a Material Environmental Amount.

                  (e) No judicial proceeding or governmental or administrative
         action is pending or, to the knowledge of the Borrower, threatened,
         under any Environmental Law to which the Borrower or any Subsidiary,
         or, to the best knowledge of the Borrower, any Joint Venture, is or
         will be named as a party with respect to the Properties or the
         Business, nor are there any consent decrees or other decrees, consent
         orders, administrative orders or other orders, or other administrative
         or judicial requirements outstanding under any Environmental Law with
         respect to the Properties or the Business except insofar as such
         proceeding, action, decree, order or other requirement, or any
         aggregation thereof, could not reasonably be expected to result in the
         payment of a Material Environmental Amount.

                  (f) To the best knowledge of the Borrower, there has been no
         release or threat of release of Materials of Environmental Concern at
         or from the Properties, or arising from or related to the operations of
         the Borrower or any Subsidiary or any Joint Venture, in connection with
         the Properties or otherwise in connection with the Business, in
         violation of or in amounts or in a manner that could give rise to
         liability under Environmental Laws except insofar as any such violation
         or liability referred to in this paragraph, or any aggregation thereof,
         could not reasonably be expected to result in the payment of a Material
         Environmental Amount.

                  (g) There are no Liens arising under or pursuant to any
         Environmental Laws on any of the real properties or properties owned or
         leased by any Loan Party, and no government actions have been taken or
         are in process which could subject any of such properties to such Liens
         and no Loan Party would be required to place any notice or restriction
         relating to the presence of Hazardous Materials at any properties owned
         by it in any deed to such properties.

                  (h) There have been no environmental investigations, studies,
         audits, tests, reviews or other analyses conducted by or which are in
         the possession of any Loan Party in relation to any properties or
         facility now or previously owned or leased by any Loan Party which have
         not been made available to the Lenders.

                  5.18 Accuracy and Completeness of Information. The factual
statements contained in the financial statements (other than financial
projections) referred to in subsection 5.1, the Loan Documents, the Confidential
Information Memorandum dated April 1999 and any other certificates or documents
furnished or to be furnished (but only, with respect to documents furnished
after the Closing Date, documents provided pursuant to subsection 7.2(d)) to the



<PAGE>   48


                                                                              43

Administrative Agent or the Lenders from time to time in connection with this
Agreement, taken as a whole, do not and will not, to the knowledge of the
Borrower, 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 the
Administrative Agent or matters of public knowledge that generally affect any of
the industry segments included in the Business of the Borrower, its Subsidiaries
or any Joint Venture) necessary in order to make the statements contained
therein not misleading in light of the circumstances in which the same were
made, such knowledge qualification being given only with respect to factual
statements made by Persons other than the Borrower, and all financial
projections contained in any such document or certificate have been prepared in
good faith based upon assumptions believed by the Borrower to be reasonable.

                  5.19 Security Documents. The Pledge Agreements are each
effective to create in favor of the Administrative Agent, for the ratable
benefit of the Lenders, a legal, valid and enforceable security interest in the
respective Interests described therein and proceeds thereof, and the Pledge
Agreements each constitute a fully perfected first Lien on, and security
interest in, all right, title and interest of the Borrower and Leviathan,
respectively, in such Interests and Pledged Certificates and in proceeds thereof
superior in right to any other Person. Each Security Agreement is effective to
create in favor of the Administrative Agent, for the ratable benefit of the
Lenders, a legal, valid and enforceable security interest in the respective
collateral described therein and proceeds thereof, and the Security Agreements
constitute fully perfected, first priority Liens on, and security interests in
(subject to the Liens permitted pursuant to subsection 8.3), all right, title
and interest of the Borrower and the Subsidiary Guarantors in such collateral
and the proceeds thereof superior in right to any other Person other than Liens
permitted hereby.

                  5.20 Joint Venture Charters, Management Agreement, etc. (a) As
of the Closing Date, the Administrative Agent has received, with a copy for each
Lender, a complete copy of each of the Joint Venture Charters of each Joint
Venture any of the interests in which is owned by a Restricted Subsidiary and
all amendments thereto, waivers relating thereto and other side letters or
agreements affecting the terms thereof.

                  (b) As of the Closing Date, the Administrative Agent has
received a complete copy of the Partnership Agreement, the Management Agreement
and each credit agreement to which any Joint Venture any of the interests in
which is owned by a Restricted Subsidiary is a party (including all exhibits,
schedules and disclosure letters referred to therein or delivered pursuant
thereto, if any) and all amendments thereto, waivers, relating thereto and other
side letters or agreements affecting the terms thereof (collectively, such
agreements and documents described in paragraphs (a) and (b) of this subsection
5.20 are referred to as the "Documents"). None of the Documents has been amended
or supplemented, nor have any of the provisions thereof been waived, except (i)
pursuant to a written agreement or instrument which has heretofore been
consented to in writing by the Required Lenders or (ii) in accordance with the
provisions of this Agreement.

                  (c) Except as disclosed on Schedule 5.6, each of the Documents
has been duly executed and delivered by each of the Borrower and its
Subsidiaries party thereto and, to the Borrower's knowledge, by each of the
other parties thereto, is in full force and effect and constitutes a legal,
valid and binding enforceable obligation of each of the Borrower and its



<PAGE>   49


                                                                              44

Subsidiaries party thereto and, to the Borrower's knowledge, each other party
thereto. None of the Borrower or any of its Subsidiaries party to any of the
Documents, is in default in the performance of any of its obligations thereunder
in any material respect which would give any other party to such Document a
right to accelerate payment of amounts due under, or terminate, such Document.

                  5.21 Senior Indebtedness. The Obligations constitute "Senior
Indebtedness" of the Borrower under and as defined in the Senior Subordinated
Note Indenture. The obligations of each Subsidiary Guarantor under the Loan
Documents to which it is a party constitute "Senior Debt" of such Subsidiary
Guarantor under and as defined in the Senior Subordinated Note Indenture.

                  5.22 Year 2000 Matters. To the Borrower's knowledge, any
reprogramming required to permit the proper functioning (but only to the extent
that such proper functioning would otherwise be impaired by the occurrence of
the year 2000) in and following the year 2000 of computer systems and other
equipment containing embedded microchips, in either case owned or operated by
the Borrower or any of its Subsidiaries or otherwise controlled and used or
relied upon in the conduct of their business (including any such systems and
other equipment supplied by others or with which the computer systems of
Holdings, the Borrower or any of its Subsidiaries interface), and the testing of
all such systems and other equipment as so reprogrammed, will be completed by
September 30, 1999 except for such failure to reprogram or test which would not
reasonably be expected to have a Material Adverse Effect. To the Borrower's
knowledge, the costs to the Borrower and its Subsidiaries that have not been
incurred as of the date hereof for such reprogramming and testing and for the
other reasonably foreseeable consequences to them of any improper functioning of
other computer systems and equipment containing embedded microchips due to the
occurrence of the year 2000 could not reasonably be expected to result in a
Default or Event of Default or to have a Material Adverse Effect. Except for any
reprogramming referred to above, the computer systems of the Borrower and its
Subsidiaries are and, with ordinary course upgrading and maintenance, are
expected to continue for the term of this Agreement to be, sufficient for the
conduct of their business as currently conducted, except for such
insufficiencies as would not reasonably be expected to have a Material Adverse
Effect.


                         SECTION 6. CONDITIONS PRECEDENT

                  6.1 Conditions to Initial Extensions of Credit. The agreement
of each Lender to make the initial extension of credit requested to be made by
it is subject to the satisfaction, immediately prior to or concurrently with the
making of such extension of credit on the Closing Date, of the following
conditions precedent (it being agreed that the conditions described in
paragraphs (b), (h), (i) and (j) below may be satisfied at any time prior to the
30th day following the Closing Date unless the Administrative Agent requests
that such conditions be satisfied earlier):

                  (a) Loan Documents. The Administrative Agent shall have
         received (i) this Agreement, executed and delivered by a duly
         authorized officer of the Borrower, (ii) for the account of each Lender
         which requests the same, a Revolving Credit Note executed



<PAGE>   50


                                                                              45

         and delivered by a duly authorized officer of the Borrower, and (iii) a
         confirmation of each of the Guarantees and Security Documents, executed
         and delivered by a duly authorized officer of each Loan Party thereto
         and satisfactory in form to the Administrative Agent.

                  (b) Related Agreements. The Administrative Agent shall have
         received true and correct copies, certified as to authenticity by the
         Borrower, of the Partnership Agreement, the certificate of limited
         partnership of the Borrower, the Management Agreement, the limited
         liability company agreement, or certificate of incorporation and
         by-laws, as the case may be, of each Subsidiary, the Joint Venture
         Charter of each Joint Venture and each agreement evidencing, securing
         or under which is issued Indebtedness of any of the Joint Ventures
         under their respective credit facilities, and such other documents or
         instruments as may be reasonably requested by the Administrative Agent,
         including, without limitation, a copy of any debt instrument, security
         agreement or other material contract to which any Joint Venture may be
         a party.

                  (c) Borrowing Certificate. The Administrative Agent shall have
         received a certificate of the Borrower, dated the Closing Date,
         substantially in the form of Exhibit L, with appropriate insertions and
         attachments, satisfactory in form and substance to the Administrative
         Agent, executed by the Chief Executive Officer, Chief Operating
         Officer, Chief Financial Officer, President, Treasurer or any Vice
         President of the Borrower and the Secretary or any Assistant Secretary
         of the Borrower.

                  (d) Partnership Proceedings of the Borrower. The
         Administrative Agent shall have received a copy of the resolutions, in
         form and substance satisfactory to the Administrative Agent, of the
         Board of Directors of the General Partner authorizing on behalf of the
         Borrower (i) the execution, delivery and performance of this Agreement,
         the Revolving Credit Notes and the other Loan Documents to which the
         Borrower is a party, (ii) the borrowings contemplated hereunder and
         (iii) the granting by the Borrower of the Liens created pursuant to the
         Security Documents to which it is a party, certified by the Secretary
         or an Assistant Secretary of the General Partner on behalf of the
         Borrower as of the Closing Date, which certificate shall be in form and
         substance satisfactory to the Administrative Agent and shall state that
         the resolutions thereby certified have not been amended, modified,
         revoked or rescinded.

                  (e) Borrower Incumbency Certificate. The Administrative Agent
         shall have received a certificate of the Borrower, dated the Closing
         Date, as to the incumbency and signature of the officers of the
         Borrower executing any Loan Document, satisfactory in form and
         substance to the Administrative Agent, executed by the Chief Executive
         Officer, Chief Operating Officer, Chief Financial Officer, President,
         Treasurer or any Vice President and the Secretary or any Assistant
         Secretary of the Borrower.

                  (f) Corporate Proceedings of Leviathan. The Administrative
         Agent shall have received a copy of the resolutions, in form and
         substance satisfactory to the Administrative Agent, of the Board of
         Directors of Leviathan authorizing (i) the execution, delivery and
         performance of the Loan Documents to which Leviathan is a party and
         (ii) the granting by it of the Liens created pursuant to the Security
         Documents to



<PAGE>   51


                                                                              46

         which it is a party, certified by the Secretary or an Assistant
         Secretary of Leviathan as of the Closing Date, which certificate shall
         be in form and substance satisfactory to the Administrative Agent and
         shall state that the resolutions thereby certified have not been
         amended, modified, revoked or rescinded.

                  (g) Leviathan Incumbency Certificate. The Administrative Agent
         shall have received a certificate of Leviathan, dated the Closing Date,
         as to the incumbency and signature of the officers of Leviathan
         executing any Loan Document, satisfactory in form and substance to the
         Administrative Agent, executed by the Chief Executive Officer, Chief
         Operating Officer, Chief Financial Officer, President, Treasurer or any
         Vice President and the Secretary or any Assistant Secretary of
         Leviathan.

                  (h) Proceedings of Subsidiaries. The Administrative Agent
         shall have received a copy of the resolutions, in form and substance
         satisfactory to the Administrative Agent, of the Managing Member or the
         Board of Directors, as applicable, of each Subsidiary of the Borrower
         which is a party to a Loan Document authorizing (i) the execution,
         delivery and performance of the Loan Documents to which it is a party
         and (ii) the granting by it of the Liens created pursuant to the
         Security Documents to which it is a party, certified by the Secretary
         or an Assistant Secretary of such Subsidiary as of the Closing Date,
         which certificate shall be in form and substance satisfactory to the
         Administrative Agent and shall state that the resolutions thereby
         certified have not been amended, modified, revoked or rescinded.

                  (i) Subsidiary Incumbency Certificates. The Administrative
         Agent shall have received a certificate of each Subsidiary of the
         Borrower which is a Loan Party, dated the Closing Date, as to the
         incumbency and signature of the officers of such Subsidiary executing
         any Loan Document, satisfactory in form and substance to the
         Administrative Agent, executed by the Chief Executive Officer, Chief
         Operating Officer, Chief Financial Officer, President, Treasurer or any
         Vice President and the Secretary or any Assistant Secretary of each
         such Subsidiary.

                  (j) Corporate Documents. The Administrative Agent shall have
         received true and complete copies of the certificate of incorporation
         and by-laws of Leviathan and the certificate of formation or
         certificate of incorporation, as the case may be, of each Subsidiary of
         the Borrower, certified as of the Closing Date as complete and correct
         copies thereof by the Secretary or an Assistant Secretary of Leviathan
         or such Subsidiary, as the case may be.

                  (k) Consents, Licenses and Approvals. The Administrative Agent
         shall have received, with a counterpart for each Lender, a certificate
         of a Responsible Officer of the Borrower (i) attaching copies of all
         consents, authorizations and filings referred to in subsection 5.4, and
         (ii) stating that such consents, licenses and filings are in full force
         and effect, and each such consent, authorization and filing shall be in
         form and substance satisfactory to the Administrative Agent.




<PAGE>   52


                                                                              47

                  (l) Fees. The Administrative Agent and each Lender shall have
         received the fees to be received on the Closing Date as separately
         agreed to between each of them and the Borrower.

                  (m) Legal Opinion. The Administrative Agent shall have
         received, with a counterpart for each Lender, the executed legal
         opinion of Akin, Gump, Strauss, Hauer & Feld, L.L.P., counsel to the
         Borrower and the other Loan Parties, in form and substance reasonably
         satisfactory to the Administrative Agent.

                  (n) Pledged Stock; Stock Powers. The Administrative Agent
         shall have received the certificates, if any, representing the shares
         and limited liability company interests pledged pursuant to each of the
         Pledge Agreements, together with an undated stock power for each such
         certificate executed in blank by a duly authorized officer of the
         pledgor thereof. Each Instruction to Register Pledge referred to in
         such Pledge Agreements shall have been delivered to the Borrower and
         its Subsidiaries, and each Initial Transaction Statement referred to in
         such Pledge Agreements shall have been delivered to the Administrative
         Agent, as are required by any of the Pledge Agreements.

                  (o) Actions to Perfect Liens. The Administrative Agent shall
         have received evidence in form and substance satisfactory to it that
         all filings, recordings, registrations and other actions, including,
         without limitation, the filing of duly executed financing statements on
         form UCC-1 and amendments to financing statements on form UCC-3,
         necessary or, in the opinion of the Administrative Agent, desirable to
         perfect the Liens created by the Security Documents shall have been
         completed.

                  (p) Insurance. (i) The Administrative Agent shall have
         received evidence in form and substance satisfactory to it and all of
         the requirements of subsection 7.5 shall have been satisfied.

                  (ii) The Lenders shall have received a schedule detailing, and
         shall be satisfied with, the amount, coverage and carriers of the
         insurance carried by the Borrower, the Restricted Subsidiaries and
         Leviathan.

                  (q) Good Standing Certificates. The Administrative Agent shall
         have received copies of certificates dated as of a recent date from the
         Secretary of State or other appropriate authority of such jurisdiction,
         evidencing the good standing of the Borrower and each other Loan Party
         in each state where the ownership, lease or operation of property or
         the conduct of business requires it to qualify as a foreign
         corporation, partnership or limited liability company, as the case may
         be.

                  (r) No Violation. The consummation of the transactions
         contemplated hereby shall not contravene, violate or conflict with, nor
         involve any Lender in any violation of, any Requirement of Law.

                  (s) Litigation, Etc. No suit, action, investigation, inquiry
         or other proceeding (including, without limitation, the enactment or
         promulgation of a statute or rule) by or before any arbitrator or any
         Governmental Authority shall be



<PAGE>   53


                                                                              48

         pending and no preliminary or permanent injunction or order by a state
         or federal court shall have been entered (i) in connection with any
         Loan Document or any of the transactions contemplated hereby or thereby
         or (ii) which, in any such case could have a Material Adverse Effect.

                  (t) Senior Subordinated Notes. The Borrower shall have
         received (i) at least $175,000,000 in gross cash proceeds from the
         issuance of the Senior Subordinated Notes and (ii) a copy of the Senior
         Subordinated Note Indenture, certified as of the Closing Date as a
         complete copy thereof by the Secretary or an Assistant Secretary of the
         Borrower. The Senior Subordinated Note Indenture shall be satisfactory
         in form of substance to the Lenders.

                  (u) Consents. All material governmental and third party
         approvals (or arrangements satisfactory to the Lenders in lieu of such
         approvals) necessary or advisable in connection with the transactions
         and financings contemplated hereby and by the other Loan Documents and
         the continuing operations of the Borrower, the Subsidiaries and the
         Joint Ventures (including, without limitation, any consent of other
         partners of and lenders to any Joint Venture) shall have been obtained
         and be in full force and effect.

                  (v) Material Adverse Effect. No event which has or could have
         a Material Adverse Effect shall have occurred.

                  (w) No Defaults. There shall exist no event of default (or
         condition which would constitute an event of default with the giving of
         notice or the passage of time) under any material Capital Stock,
         financing agreements, lease agreements, partnership agreements or other
         material contracts of the Borrower or the Subsidiaries or, to the
         knowledge of the Borrower, any Joint Venture.

                  (x) Tax and Labor Matters. The Lenders shall be satisfied with
         the status of all labor, tax, employee benefit and health and safety
         matters involving the Borrower and the Restricted Subsidiaries.

                  (y) Financial Statements. The Administrative Agent shall have
         received, with a counterpart for each Lender, complete copies of the
         financial statements described in subsection 5.1.

                  (z) Commodity Hedging Program. The Administrative Agent shall
         have received, with a counterpart for each Lender, a report on the
         status of the Commodity Hedging Programs of the Borrower covering the
         Borrower's interest in production from the Subject Properties in
         amounts and for periods reasonably satisfactory to the Administrative
         Agent.

                  (aa) Viosca Knoll. The Borrower and its Restricted
         Subsidiaries shall have executed definitive documentation with El Paso
         Energy and its Subsidiaries providing for the acquisition no later than
         June 1, 1999 by the Borrower and its Restricted Subsidiaries of all of
         the interest of El Paso Energy and its Subsidiaries in Viosca Knoll
         (other than a



<PAGE>   54


                                                                              49

         1% interest in profits and capital of Viosca Knoll) on substantially
         the terms set forth in the Borrower's Proxy Statement dated February 8,
         1999.

                  (bb) Accrued Interest, Fees and Term Loans. The Borrower shall
         have paid to the Administrative Agent all unpaid interest, commitment
         fees and letter of credit commissions accrued and all term loans
         outstanding under the Existing Credit Agreement through the Closing
         Date.

                  (cc) Reallocation of Revolving Credit Loans; Assignments. The
         Lenders shall have reallocated the Revolving Credit Loans outstanding
         under this Agreement immediately prior to the Closing Date, and the
         Lenders and the lenders under the Existing Credit Agreement shall be
         deemed to have made such assignments of the Revolving Credit
         Commitments among themselves, as directed by the Administrative Agent
         in order to reflect the Revolving Credit Commitments under this
         Agreement.

                  (dd) Additional Matters. All corporate, company, partnership
         and other proceedings, and all documents, instruments and other legal
         matters in connection with the transactions contemplated by this
         Agreement and the other Loan Documents shall be reasonably satisfactory
         in form and substance to the Lenders, and the Lenders shall have
         received such other documents and legal opinions in respect of any
         aspect or consequence of the transactions contemplated hereby or
         thereby as any of them shall reasonably request.

                  6.2 Conditions to Each Extension of Credit. The agreement of
each Lender to make any extension of credit (including the renewal or extension
of a Letter of Credit) requested to be made by it on any date (including,
without limitation, its initial extension of credit) is subject to the
satisfaction of the following conditions precedent:

                  (a) Representations and Warranties. Each of the
         representations and warranties made by the Borrower and the other Loan
         Parties in or pursuant to the Loan Documents shall be true and correct
         in all material respects on and as of such date as if made on and as of
         such date (unless such representations and warranties are stated to
         relate 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).

                  (b) No Default. No Default or Event of Default shall have
         occurred and be continuing on such date or after giving effect to the
         extensions of credit requested to be made on such date.

                  (c) Additional Matters. The Administrative Agent shall have
         received such other documents and legal opinions in respect of any
         aspect or consequence of the transactions contemplated hereby or by the
         other Loan Documents as it shall reasonably request.

Each borrowing by the Borrower hereunder, and each issuance or renewal or
extension of a Letter of Credit hereunder, shall constitute a representation and
warranty by the Borrower as of the date of such extension of credit or such
conversion that the conditions contained in this subsection 6.2 have been
satisfied.



<PAGE>   55


                                                                              50


                        SECTION 7. AFFIRMATIVE COVENANTS

                  The Borrower hereby agrees that, so long as the Revolving
Credit Commitments remain in effect, any Revolving Credit Note or any Letter of
Credit remains outstanding and unpaid or any other amount is owing to any
Lender, the Administrative Agent hereunder, the Borrower shall and (except in
the case of delivery of financial information, reports and notices) shall cause
each of its Restricted Subsidiaries and, with respect to subsections 7.3 and
7.11, each of its Unrestricted Subsidiaries, to:

                  7.1 Financial Statements. Furnish to the Administrative Agent,
with copies for the Lenders:

                  (a) as soon as available, but in any event within 120 days
         after the end of each fiscal year of the Borrower, a copy of the
         consolidated balance sheet of the Borrower and its consolidated
         Subsidiaries as at the end of such year and the related consolidated
         statements of income and retained earnings and of cash flows for such
         year, setting forth in each case in comparative form the figures for
         the previous year, reported on without a "going concern" or like
         qualification or exception, or qualification arising out of the scope
         of the audit, by PricewaterhouseCoopers LLP or other independent
         certified public accountants of nationally recognized standing;

                  (b) as soon as available, but in any event not later than 60
         days after the end of each of the first three quarterly periods of each
         fiscal year of the Borrower, the unaudited consolidated and
         consolidating balance sheet of the Borrower and its consolidated
         Subsidiaries as at the end of such quarter and the related unaudited
         consolidated and consolidating statements of income and retained
         earnings and of cash flows of the Borrower and its consolidated
         Subsidiaries for such quarter and the portion of the fiscal year
         through the end of such quarter, setting forth in each case in
         comparative form the figures for the previous year, certified by a
         Responsible Officer as being fairly stated in all material respects
         when considered in relation to the consolidated and consolidating
         financial statements of the Borrower and its consolidated Subsidiaries
         (subject to normal year-end audit adjustments);

                  (c) concurrently with the delivery of the financial statements
         for any fiscal year described in paragraph (a) of this subsection 7.1,
         the unaudited consolidating balance sheets of the Borrower and its
         consolidated Subsidiaries as at the end of such fiscal year and the
         related unaudited consolidating statements of income and retained
         earnings and of cash flows of the Borrower and its consolidated
         Subsidiaries for such fiscal year, setting forth in each case in
         comparative form the figures for the previous year, certified by a
         Responsible Officer as being fairly stated in all material respects
         when considered in relation to the consolidating financial statements
         of the Borrower and its consolidated Subsidiaries;

                  (d) as soon as available, but in any event within 120 days
         after the end of each fiscal year of each material Joint Venture any of
         the interests in which is owned by a Restricted Subsidiary, a copy of
         the audited balance sheet of such Joint Venture, as at the



<PAGE>   56


                                                                              51

         end of such year and the related unaudited statements of income and
         retained earnings and of cash flows of such Joint Venture, for such
         year, setting forth in each case in a comparative form the figures for
         the previous year, reported on without a "going concern" or like
         qualification or exception, or qualification arising out of the scope
         of the audit, by independent certified public accountants of nationally
         recognized standing; and

                  (e) concurrently with the delivery of the financial statements
         referred to in subsection 7.1(b), the unaudited balance sheet of each
         Joint Venture any of the interests in which is owned by a Restricted
         Subsidiary, as at the end of each such quarter of such Joint Venture,
         and the related unaudited consolidated statements of income and
         retained earnings and of cash flows of such Joint Venture, for such
         month and the portion of the fiscal year through the end of such month,
         setting forth in each case in comparative form the figures for the
         previous year, in each case received by the Borrower or any of its
         Subsidiaries during such fiscal quarter;

all such financial statements shall be complete and correct in all material
respects and shall be prepared in reasonable detail and (except for the
financial statements of any Joint Venture) in accordance with GAAP applied
consistently throughout the periods reflected therein and with prior periods
(except as approved by such accountants or officer, as the case may be, and
disclosed therein and, with respect to unaudited interim financial statements,
for the absence of footnotes and year-end adjustments).

                  7.2 Certificates; Other Information. Furnish to the
Administrative Agent, with copies for the Lenders:

                  (a) concurrently with the delivery of the financial statements
         referred to in subsection 7.1(a), a certificate of the independent
         certified public accountants reporting on such financial statements
         stating that in making the examination necessary therefor no knowledge
         was obtained of any Default or Event of Default relating to accounting
         issues, except as specified in such certificate;

                  (b) concurrently with the delivery of the financial statements
         referred to in subsections 7.1(a) and 7.1(b), a certificate of a
         Responsible Officer of the Borrower, (i) stating that, to the best of
         such Officer's knowledge, the Borrower and its Subsidiaries during such
         period have observed or performed all of their respective covenants and
         other agreements, and satisfied every condition, contained in this
         Agreement and in the Revolving Credit Notes and the other Loan
         Documents to be observed, performed or satisfied by them, and that such
         Officer has obtained no knowledge of any Default or Event of Default
         except as specified in such certificate, and (ii) setting forth (x) in
         reasonable detail the calculation of the covenants set forth in
         subsection 8.1 for the Calculation Period ending on the last day of
         such fiscal quarter and (y) in reasonable detail the calculation of the
         Incurrence Limitation as of the last day of the most recent fiscal
         quarter covered by such certificate;

                  (c) not later than thirty days prior to the end of each fiscal
         year of the Borrower, a copy of the projections by the Borrower of the
         operating budget and cash flow budget of the Borrower for the
         succeeding fiscal year, such projections to be accompanied by a



<PAGE>   57


                                                                              52

         certificate of a Responsible Officer to the effect that such
         projections have been prepared on the basis of sound financial planning
         practice and that such Officer has no reason to believe they are
         incorrect or misleading in any material respect;

                  (d) within five days after the same are sent, copies of all
         financial statements and reports which the Borrower sends to the
         holders of its Capital Stock, and within five days after the same are
         filed, copies of all financial statements and reports which the
         Borrower may make to, or file with, the Securities and Exchange
         Commission or any successor or analogous Governmental Authority;

                  (e) upon the request of any Lender, and to the extent the same
         have been received by the Borrower or any of its Subsidiaries, a copy
         of the projections by each Joint Venture any of the interests in which
         is owned by a Restricted Subsidiary, as the case may be, of the
         operating budget and cash flow budget of such Joint Venture for the
         succeeding fiscal year;

                  (f) upon the request of any Lender, and to the extent the same
         have been received by the Borrower or any of its Subsidiaries, within
         thirty days of the end of each of the quarterly periods of each fiscal
         year of each Joint Venture any of the interests in which is owned by a
         Restricted Subsidiary, a list of all shippers that have used such Joint
         Venture during such quarterly period and the volumes and revenues
         attributable to each such shipper;

                  (g) upon the request of any Lender, and to the extent the same
         have been received by the Borrower or any of its Subsidiaries, copies
         of all compliance certificates delivered by each Joint Venture any of
         the interests in which is owned by a Restricted Subsidiary, pursuant to
         any credit agreement to which such Joint Venture is a party;

                  (h) upon the request of any Lender, within five days after the
         same are received by the Borrower, a copy of any FERC Form 2 for any
         Joint Venture any of the interests in which is owned by a Restricted
         Subsidiary;

                  (i) concurrently with the delivery of the financial statements
         referred to in subsection 7.1(a), a certificate signed by the
         President, Chief Executive Officer, Chief Operating Officer or Chief
         Financial Officer of the Borrower in the form of Exhibit N hereto.
         Further, if requested by the Required Lenders (by notice to the
         Administrative Agent, which will give notice of such request to the
         Borrower and each Lender), the Borrower shall permit and cooperate with
         an environmental and safety review made in connection with the
         operations of Borrower's properties once during each fiscal year of the
         Borrower, by independent environmental consultants chosen by the
         Borrower and acceptable to the Required Lenders, which review shall, if
         requested by such Lender or Lenders, be arranged and supervised by
         environmental legal counsel for the Lenders, all at the Borrower's cost
         and expense. The consultant shall render a verbal or written report, as
         specified by the Lenders, based upon such review, at the Borrower's
         cost and expense. Notwithstanding anything in this paragraph (i) to the
         contrary, the maximum amount of cost and expense for which the Borrower
         shall be responsible with respect to any such review in any fiscal year
         shall be $25,000;



<PAGE>   58


                                                                              53

                  (j) concurrently with the delivery of the financial statements
         referred to in subsection 7.1(a), a Reserve Report, at the Borrower's
         cost and expense;

                  (k) concurrently with the delivery of the financial statements
         referred to in subsections 7.1(a) and 7.1(b), a statement of production
         by blocks of oil and gas setting forth on a monthly basis average sales
         price received for the Subject Properties;

                  (l) concurrently with the delivery of the financial statements
         referred to in subsections 7.1(a) and 7.1(b), a throughput report
         setting forth the throughputs of each pipeline owned by the Borrower;
         and

                  (m) promptly, such additional financial and other information
         concerning any Loan Party, any Unrestricted Subsidiary or any Joint
         Venture as any Lender may from time to time reasonably request.

                  7.3 Payment of Obligations. Pay, discharge or otherwise
satisfy at or before maturity or before they become delinquent, as the case may
be, all its obligations of whatever nature, except where the amount or validity
thereof is currently being contested in good faith by appropriate proceedings
and reserves in conformity with GAAP with respect thereto have been provided on
the books of the Borrower or its Subsidiaries, as the case may be, and except
where the failure to so pay, discharge or satisfy such obligations could not
reasonably be expected to have a Material Adverse Effect.

                  7.4 Conduct of Business and Maintenance of Existence. Continue
to engage in business of the same general type as now conducted by it and
preserve, renew and keep in full force and effect its corporate existence and
take all reasonable action to maintain all rights, privileges and franchises
necessary or desirable in the normal conduct of its business; comply with all
Contractual Obligations and Requirements of Law except to the extent that
failure to comply therewith could not, in the aggregate, reasonably be expected
to have a Material Adverse Effect.

                  7.5 Maintenance of Property; Insurance. Keep all property
useful and necessary in its business in good working order and condition;
maintain with financially sound and reputable insurance companies insurance on
all its property in at least such amounts and against at least such risks (but
including in any event fire, casualty, public liability and product liability)
as are usually insured against in the same general area by companies engaged in
the same or a similar business; and furnish to each Lender, upon written
request, full information as to the insurance carried. Upon demand by any Lender
(by notice to the Administrative Agent, which shall give notice of such demand
to the Borrower and each Lender) any insurance policies covering Collateral
shall be endorsed to provide that such policies may not be cancelled or reduced
or affected in any material manner for any reason without 15 days prior notice
to the Lenders. The Borrower shall, and shall cause each of its Restricted
Subsidiaries to, at all times maintain liability and other insurance in
accordance with and in the amounts set forth on the schedule delivered pursuant
to subsection 6.1(p)(ii), which insurance shall be by financially sound and
reputable insurers.




<PAGE>   59


                                                                              54

                  7.6 Inspection of Property; Books and Records; Discussions.
Keep proper books of records and accounts in which full, true and correct
entries in conformity with GAAP and all Requirements of Law shall be made of all
dealings and transactions in relation to its business and activities; and permit
representatives of any Lender to visit and inspect any of its properties and
examine and make abstracts from any of its books and records at any reasonable
time and as often as may reasonably be desired and to discuss the business,
operations, properties and financial and other condition of the Borrower and its
Restricted Subsidiaries with officers and employees of the Borrower and its
Restricted Subsidiaries and with its independent certified public accountants.

                  7.7 Notices. Promptly give notice to the Administrative Agent
and each Lender of:

                  (a) the occurrence of any Default or Event of Default;

                  (b) any (i) default or event of default under any Contractual
         Obligation of the Borrower or any of its Subsidiaries or (ii)
         litigation, investigation or proceeding which may exist at any time
         between the Borrower or any of its Subsidiaries and any Governmental
         Authority, which in either case, if not cured or if adversely
         determined, as the case may be, could reasonably be expected to have a
         Material Adverse Effect;

                  (c) any litigation or proceeding affecting the Borrower or any
         of its Subsidiaries in which the amount involved is $5,000,000 or more
         and not covered by insurance or in which injunctive or similar relief
         is sought;

                  (d) the following events, as soon as possible and in any event
         within 30 days after the Borrower knows or has reason to know thereof:
         (i) the occurrence or expected occurrence of any Reportable Event with
         respect to any Plan, a failure to make any required contribution to a
         Plan, the creation of any Lien in favor of the PBGC or a Plan or any
         withdrawal from, or the termination, Reorganization or Insolvency of,
         any Multiemployer Plan or (ii) the institution of proceedings or the
         taking of any other action by the PBGC or the Borrower or any Commonly
         Controlled Entity or any Multiemployer Plan with respect to the
         withdrawal from, or the terminating, Reorganization or Insolvency of,
         any Plan; and

                  (e) any development or event which could reasonably be
         expected to have a Material Adverse Effect or cause the incurrence of
         an environmental liability in excess of the Material Environmental
         Amount.

Each notice pursuant to this subsection shall be accompanied by a statement of a
Responsible Officer setting forth details of the occurrence referred to therein
and stating what action the Borrower proposes to take with respect thereto.

                  7.8  Environmental Laws.

                  (a) Comply with, and ensure compliance by all tenants and
         subtenants, if any, with, all applicable Environmental Laws and obtain
         and comply with and maintain, and



<PAGE>   60


                                                                              55

         ensure that all tenants and subtenants obtain and comply with and
         maintain, any and all licenses, approvals, notifications, registrations
         or permits required by applicable Environmental Laws except to the
         extent that failure to do so could not reasonably be expected to have a
         Material Adverse Effect;

                  (b) Conduct and complete all investigations, studies, sampling
         and testing, and all remedial, removal and other actions required under
         Environmental Laws and promptly comply with all lawful orders and
         directives of all Governmental Authorities regarding Environmental Laws
         except to the extent that the same are being contested in good faith by
         appropriate proceedings and the pendency of such proceedings could not
         reasonably be expected to have a Material Adverse Effect; and

                  (c) Defend, indemnify and hold harmless the Administrative
         Agent and the Lenders, and their respective employees, agents, officers
         and directors, from and against any and all claims, demands, penalties,
         fines, liabilities, settlements and damages, and reasonable costs and
         expenses, of whatever kind or nature known or unknown, contingent or
         otherwise, arising out of, or in any way relating to the violation of,
         noncompliance with or liability under, any Environmental Law applicable
         to the operations of the Borrower, any of its Subsidiaries or the
         Properties, or any orders, requirements or demands of Governmental
         Authorities related thereto, including, without limitation, attorney's
         and consultant's fees, investigation and laboratory fees, response
         costs, court costs and litigation expenses, except to the extent that
         any of the foregoing arise out of the gross negligence or willful
         misconduct of the party seeking indemnification therefor. The
         agreements in this paragraph shall survive repayment of the Revolving
         Credit Notes and all other amounts payable hereunder.

                  7.9 Maintenance of Liens of the Security Documents. Promptly,
upon the request of the Administrative Agent, at the Borrower's expense,
execute, acknowledge and deliver, or cause the execution, acknowledgement and
delivery of, and thereafter register, file or record, or cause to be registered,
filed or recorded, in an appropriate governmental office, any document or
instrument supplemental to or confirmatory of the Security Documents or
otherwise deemed by the Administrative Agent necessary or desirable for the
continued validity, perfection and priority of the Liens on the collateral
covered thereby.

                  7.10 Pledge of After-Acquired Property. (a) With respect to
any right, title or interest of any Loan Party in any Capital Stock or other
property of a type subject to the Security Documents and acquired after the
Closing Date, promptly grant or cause to be granted to the Administrative Agent,
for the benefit of the Lenders, a first Lien of record on all such Capital Stock
and property (other than such Capital Stock and property subject to (i) prior
Liens in existence at the time of acquisition thereof and not created in
anticipation of such acquisition, in which case the Lien of the Lenders shall be
of such priority as is permitted by such prior Lien and (ii) other Liens that
are expressly permitted by this Agreement), upon terms substantially the same as
those set forth in the Security Documents, and satisfy the conditions with
respect thereto set forth in subsection 6.1. The Borrower, at its own expense,
shall execute, acknowledge and deliver, or cause its Restricted Subsidiaries to
execute, acknowledge and deliver, and thereafter register, file or record, or
cause its Restricted Subsidiaries to register, file or record, in an appropriate
governmental office, any document or instrument deemed by the Administrative



<PAGE>   61


                                                                              56

Agent to be necessary or desirable for the creation and perfection of the
foregoing Liens and deliver Uniform Commercial Code searches in jurisdictions
requested by the Administrative Agent with respect to such Capital Stock and
other property and legal opinions requested by the Administrative Agent and
shall pay, or cause to be paid, all taxes and fees related to such registration,
filing or recording.

                  (b) With respect to any new Restricted Subsidiary created or
acquired after the Closing Date by the Borrower, promptly cause such Restricted
Subsidiary to execute and deliver to the Administrative Agent the Subsidiary
Guarantee, and, if requested by the Administrative Agent, deliver to the
Administrative Agent legal opinions relating to such Restricted Subsidiary and
the Subsidiary Guarantee, which opinions shall be in form and substance, and
from counsel, reasonably satisfactory to the Administrative Agent.

                  (c) Notwithstanding anything to the contrary in any Loan
Document, neither the Borrower nor any Restricted Subsidiary shall be obligated
to (a) pledge under the Loan Documents any of its equity interest in any Joint
Venture if such pledge is prohibited by any Contractual Obligation or (b) pledge
under the Loan Documents any of its real property.

                  (d) Notwithstanding anything to the contrary in any Loan
Document, if the Borrower or any Restricted Subsidiary has pledged its interest
in any Joint Venture and the Borrower or such Restricted Subsidiary desires to
make a contribution of or investment with such interest to or in a second Joint
Venture in accordance with subsection 8.8(f), the Lien held by the Lenders upon
such interest shall terminate as long as the interest held by the Borrower or
Restricted Subsidiary in the second Joint Venture shall be subject to a Lien
under the Loan Documents in accordance with subsection 8.8(f) unless otherwise
agreed by the Required Lenders.

                  7.11 Agreements Respecting Unrestricted Subsidiaries. (a)
Operate each Unrestricted Subsidiary in such a manner as to make it apparent to
all creditors of such Unrestricted Subsidiary that such Unrestricted Subsidiary
is a legal entity separate and distinct from the Borrower or any Restricted
Subsidiary and as such is solely responsible for its debts, and such manner
shall include, but shall not be limited to, the maintenance of a separate board
of directors for such Unrestricted Subsidiary.

                  (b) In connection with any Indebtedness, Guarantee Obligations
or other obligations incurred by each Unrestricted Subsidiary, (i) incur such
Indebtedness only on a basis which does not permit, allow or provide for
recourse to the Borrower or any Restricted Subsidiary, and (ii) incur any such
Indebtedness, Guarantee Obligations or other obligations in excess of $500,000
only under a loan agreement, note, lease, instrument or other contractual
obligation that expressly states that such Indebtedness is being incurred by
such Unrestricted Subsidiary on a basis which is non-recourse to the Borrower
and its Restricted Subsidiaries, provided that no such agreement, note, lease,
instrument or other Obligation shall be required to include such statement if
such agreement, note, lease, instrument or other obligation was in effect on the
date such Subsidiary became an Unrestricted Subsidiary.




<PAGE>   62


                                                                              57

                  7.12 Commodity Hedging Programs. Enter into Commodity Hedging
Programs, not to exceed 80% of annual production at any time, covering the
Borrower's interest in production of the Subject Properties.

                  7.13 Joint Venture Charters, Management Agreement, etc.
Deliver to the Administrative Agent (a) any amendments to the Documents
previously delivered, written waivers relating thereto and other side letters or
agreements in writing affecting the terms thereof and (b) any Documents relating
to any new Joint Venture any of the interests in which is owned by a Restricted
Subsidiary.


                          SECTION 8. NEGATIVE COVENANTS

                  The Borrower hereby agrees that, so long as the Revolving
Credit Commitments remain in effect, any Revolving Credit Note or any Letter of
Credit remains outstanding and unpaid or any other amount is owing to any
Lender, the Administrative Agent hereunder, the Borrower shall not, and (except
with respect to subsection 8.1) shall not permit any of its Restricted
Subsidiaries to, directly or indirectly:

                  8.1  Financial Condition Covenants.

                  (a) Tangible Net Worth. Permit Consolidated Tangible Net Worth
         at any time to be less than $70,000,000.

                  (b) Interest Coverage Ratio. Permit for any Calculation Period
         the ratio of (i) Consolidated EBITDA for such period to (ii)
         Consolidated Interest Expense for such period to be less than 2.0 to
         1.0.

                  (c) Senior Leverage Ratio. Permit, on the last day of any
         fiscal quarter of the Borrower, the ratio of (x) Consolidated Total
         Senior Indebtedness to (y) the Consolidated EBITDA for the Calculation
         Period ending on such date to exceed 3.5 to 1.0 (or, from and after the
         Equity Adjustment Date, 3.25 to 1.0).

                  (d) Leverage Ratio. Permit, on the last day of any fiscal
         quarter of the Borrower the ratio of (x) Consolidated Total
         Indebtedness at such date to (y) the Consolidated EBITDA for the
         Calculation Period ending on such date to exceed 5.35 to 1.0 (or, from
         and after the Equity Adjustment Date, 5.0 to 1.0).

Solely for purposes of paragraphs (b), (c) and (d) of this subsection 8.1,
Consolidated EBITDA shall be deemed to be $23,500,000 for each of the Borrower's
fiscal quarters ending on June 30, 1998, September 30, 1998, December 31, 1998
and March 31, 1999. The initial test date for the covenants set forth in this
subsection 8.1 shall be June 30, 1999.

                  8.2 Limitation on Indebtedness. Create, incur, assume or
suffer to exist any Indebtedness, except:

                  (a) Indebtedness of the Borrower and its Subsidiaries under
         the Loan Documents;



<PAGE>   63


                                                                              58

                  (b) Indebtedness of the Borrower to any Subsidiary Guarantor,
         and of any Subsidiary Guarantor to the Borrower or any other Subsidiary
         Guarantor;

                  (c) Indebtedness permitted pursuant to subsections 8.3 and
         8.8;

                  (d) Indebtedness of the Borrower and the Co-Borrower in
         respect of the Senior Subordinated Notes in an aggregate principal
         amount not to exceed $200,000,000;

                  (e) Indebtedness incurred pursuant to any Hedge Agreement to
         the extent permitted by subsection 8.22;

                  (f) Indebtedness (i) of any other Person existing at the time
         such other Person is merged with or into or became a Subsidiary of the
         Borrower or any Restricted Subsidiary or (ii) to which any asset is
         subject existing at the time such asset is acquired by the Borrower or
         any Restricted Subsidiary; provided that (A) no Default shall have
         occurred and be continuing at the time of, or after giving effect to,
         the incurring of such Indebtedness and (B) after giving effect to the
         incurrence of such Indebtedness the Borrower would be in pro forma
         compliance with the covenants set forth in subsection 8.1; and

                  (g) other unsecured Indebtedness of the Borrower in an
         aggregate principal amount not to exceed $10,000,000 outstanding at any
         time less the aggregate amount of Guarantee Obligations incurred
         pursuant to subsection 8.4(f) then outstanding.

                  8.3 Limitation on Liens. Create, incur, assume or suffer to
exist any Lien upon any of its property, assets or revenues, whether now owned
or hereafter acquired, except for:

                  (a) Liens for taxes not yet due or which are being contested
         in good faith by appropriate proceedings, provided that adequate
         reserves with respect thereto are maintained on the books of the
         Borrower or its Restricted Subsidiaries, as the case may be, in
         conformity with GAAP;

                  (b) carriers', warehousemen's, mechanics', materialmen's,
         repairmen's or other like Liens arising in the ordinary course of
         business which are not overdue for a period of more than 60 days or
         which are being contested in good faith by appropriate proceedings;

                  (c) pledges or deposits in connection with workers'
         compensation, unemployment insurance and other social security
         legislation and deposits securing liability to insurance carriers under
         insurance or self-insurance arrangements;

                  (d) deposits to secure the performance of bids, trade
         contracts (other than for borrowed money), leases, statutory
         obligations, surety and appeal bonds, performance bonds and other
         obligations of a like nature incurred in the ordinary course of
         business;

                  (e) easements, rights-of-way, restrictions and other similar
         encumbrances incurred in the ordinary course of business which, in the
         aggregate, are not substantial in amount and which do not in any case
         materially detract from the value of the property



<PAGE>   64


                                                                              59

         subject thereto or materially interfere with the ordinary conduct of
         the business of the Borrower or such Restricted Subsidiary;

                  (f) Liens created pursuant to construction, operating, farmout
         and maintenance agreements, space lease agreements, Joint Venture
         Charters and related documents (to the extent requiring a Lien on the
         equity interest of the Borrower or any Restricted Subsidiary, as the
         case may be, in the applicable Joint Venture is required thereunder),
         division orders, contracts for sale, transportation or exchange of oil
         and natural gas, unitization and pooling declarations and agreements,
         area of mutual interest agreements and other similar agreements, in
         each case having ordinary and customary terms and entered into in the
         ordinary course of business by the Borrower and its Restricted
         Subsidiaries; and

                  (g) additional Liens securing Indebtedness and other
         obligations not to exceed $1,000,000 at any one time outstanding.

This subsection shall not restrict the ability of any Joint Venture or
Unrestricted Subsidiary to create, incur, assume or suffer to exist any Lien on
any of its property.

                  8.4 Limitation on Guarantee Obligations. Create, incur, assume
or suffer to exist any Guarantee Obligation except:

                  (a) Guarantee Obligations created pursuant to the Loan
         Documents;

                  (b) Guarantee Obligations of the Borrower or any Restricted
         Subsidiary incurred after the Closing Date in an aggregate amount not
         to exceed $1,000,000 at any one time outstanding;

                  (c) Guarantee Obligations constituting performance guarantees
         provided in the ordinary course of business by the Borrower and its
         Restricted Subsidiaries supporting obligations of the Borrower and/or
         Restricted Subsidiaries which obligations have been incurred in the
         ordinary course of business (including in connection with the
         operation, construction or acquisition of pipelines, platforms and
         related facilities);

                  (d) Guarantee Obligations of any Subsidiary Guarantor in
         respect of the Senior Subordinated Notes, provided that such Guarantee
         Obligations are subordinated to such Subsidiary Guarantor's obligations
         under the Loan Documents to the same extent as the obligations of the
         Borrower in respect of the Senior Subordinated Notes;

                  (e) Guarantee Obligations in an aggregate amount not to exceed
         $11,500,000 at any one time outstanding incurred pursuant to clawback
         and other similar arrangements; and

                  (f) Guarantee Obligations, in addition to those described in
         clause (e) of this subsection 8.4, incurred pursuant to clawback and
         other similar arrangements in an aggregate amount not to exceed
         $10,000,000 outstanding at any time less the aggregate amount of
         Indebtedness incurred pursuant to subsection 8.2(g) then outstanding.



<PAGE>   65


                                                                              60

                  8.5 Limitations on Fundamental Changes. Enter into any merger,
consolidation or amalgamation, or liquidate, wind up or dissolve itself (or
suffer any liquidation or dissolution), or make any material change in its
present method of conducting business, except:

                  (a) any Restricted Subsidiary may be merged or consolidated
         with or into the Borrower (as long as the Borrower is the surviving
         entity) or any one or more Restricted Subsidiaries which is a
         Subsidiary Guarantor (provided that, if any of such Restricted
         Subsidiaries is not wholly owned by the Borrower and the General
         Partner, the Restricted Subsidiary or Restricted Subsidiaries in which
         the Borrower owns the greatest interest shall be the continuing or
         surviving corporation);

                  (b) any Restricted Subsidiary may sell, lease, transfer or
         otherwise dispose of any or all of its assets (upon voluntary
         liquidation or otherwise) to the Borrower or any other Restricted
         Subsidiary which is a Subsidiary Guarantor and in which, if not wholly
         owned by the Borrower and the General Partner, the Borrower owns at
         least the same percentage interests as the Borrower owns in the
         transferor Restricted Subsidiary; and

                  (c) the Borrower or any Restricted Subsidiary may enter into a
         merger, consolidation or share exchange with any other Person so long
         as:

                           (i) such transaction is permitted under subsection
                  8.8;

                           (ii) such transaction shall be effected in such
                  manner so that (A) if the Borrower is a party to such
                  transaction, the Borrower is the surviving entity and (B)
                  otherwise, the Restricted Subsidiary shall be the continuing
                  or surviving entity;

                           (iii) at the time of such acquisition and after
                  giving effect thereto, no Default or Event of Default shall
                  have occurred and shall be continuing; and

                  (d) solely to effect any transaction permitted by subsection
         8.6(b).

The transactions permitted under this subsection shall be permitted
notwithstanding anything to the contrary in subsection 4(j) of each of the
Borrower Pledge Agreement and the Leviathan Pledge Agreement (GP).

                  8.6 Limitation on Sale of Assets. Convey, sell, lease, assign,
transfer or otherwise dispose of any of its property, business or assets
(including, without limitation, receivables and leasehold interests), whether
now owned or hereafter acquired, except:

                  (a)  as permitted by subsection 8.5; and

                  (b) as long as no Default or Event of Default has occurred and
         is continuing or would result therefrom the Borrower and the Restricted
         Subsidiaries may sell or otherwise dispose of property in any fiscal
         year having an aggregate value not in excess of 5% of Consolidated
         Tangible Net Worth calculated on the last day of the prior fiscal
         quarter.



<PAGE>   66


                                                                              61

The transactions permitted under this subsection shall be permitted
notwithstanding anything to the contrary in subsection 4(j) of each of the
Borrower Pledge Agreement and the Leviathan Pledge Agreement (GP).

                  8.7 Limitation on Dividends. Declare or pay any dividend or
distribution on (other than dividends, including splits, payable solely in
non-mandatorily redeemable Capital Stock), or make any payment on account of, or
set apart assets for a sinking or other analogous fund for, the purchase,
redemption, defeasance, retirement or other acquisition of, any shares of any
class of Capital Stock of the Borrower or any warrants or options to purchase
any such Capital Stock, whether now or hereafter outstanding, or make any other
distribution in respect thereof, either directly or indirectly, whether in cash
or property or in obligations of the Borrower or any Restricted Subsidiary (such
declarations, payments, setting apart, purchases, redemptions, defeasances,
retirements, acquisitions and distributions being herein called "Restricted
Payments"), except that as long as no Default or Event of Default has occurred
and is continuing or would result therefrom, the Borrower may make Restricted
Payments once each fiscal quarter consisting of cash distributions in accordance
with the terms of the Partnership Agreement on its Preference Units, its Common
Units and the General Partnership Interest.

                  8.8 Limitation on Investments, Loans and Advances. Make any
advance, loan, extension of credit or capital contribution to, or purchase any
stock, bonds, notes, debentures or other securities of or any assets
constituting a business unit of, or make any other investment in, any Person,
except:

                  (a) extensions of trade credit in the ordinary course of
         business;

                  (b) investments in Cash Equivalents;

                  (c) capital contributions, loans or other investments made by
         the Borrower to any Restricted Subsidiary which is a Subsidiary
         Guarantor and by any Restricted Subsidiary to the Borrower or any
         Restricted Subsidiary which is a Guarantor;

                  (d) capital contributions, loans or other investments by
         Subsidiaries of the Borrower or any Joint Venture to or in the Borrower
         or any Restricted Subsidiary, provided that no Default or Event of
         Default shall have occurred and be continuing, or would occur as a
         result of such investment;

                  (e) other non-hostile acquisitions of equity securities of, or
         assets constituting a business unit of, any Person (an "Acquired
         Business"), provided that (i) immediately prior to and after giving
         effect to any such acquisition, no Default or Event of Default shall
         have occurred or be continuing (whether under subsection 8.17 or
         otherwise), (ii) such acquisition is consummated in accordance with
         applicable law, (iii) if such acquisition is of equity securities of a
         Person, such Person becomes a Restricted Subsidiary, (iv) the Borrower
         shall be in pro forma compliance with the covenants set forth in
         subsection 8.1 after giving effect to such acquisition and (v) the
         Acquired Business shall not be subject to any material liabilities
         except as permitted by this Agreement;




<PAGE>   67


                                                                              62

                  (f) the contribution by the Borrower or any Restricted
         Subsidiary of the equity interests owned by it in a Joint Venture to
         another Joint Venture or the investment by the Borrower or any
         Restricted Subsidiary in another Joint Venture to the extent made with
         equity interests in a Joint Venture owned by it as long as (i) the
         Borrower or such Restricted Subsidiary receives in exchange equity
         interests in such transferee Joint Venture and (ii) unless otherwise
         agreed by the Required Lenders, if the transferred equity interests are
         subject to a Lien under the Loan Documents, the equity interests
         received in exchange become subject to a Lien under the Loan Documents;
         and

                   (g) other capital contributions, loans or other investments
         (which shall not include the transactions described in subsection 4.13
         or 8.8(f)) in an aggregate amount not to exceed $25,000,000 (i) with
         respect to the period between the Closing Date to an including 11:59
         p.m., Central Standard Time, on December 31, 1999 or (ii) during any
         fiscal year of the Borrower beginning with the fiscal year commencing
         on January 1, 2000.

                  8.9 Limitation on Optional Payments and Modifications of Debt
Instruments and Other Agreements. (a) Make any optional payment or prepayment
on, redemption of or purchase of, or voluntarily defease, or directly or
indirectly voluntarily or optionally purchase, redeem, retire or otherwise
acquire, the Senior Subordinated Notes or any other Indebtedness or Guarantee
Obligations (other than the Revolving Credit Loans), or make any payment under
or on account of the Management Agreement except as required pursuant to the
terms thereof, (b) amend, modify or change, or consent or agree to any
amendment, modification or change to, any of the terms of the Senior
Subordinated Notes or the Senior Subordinated Note Indenture (other than any
such amendment, modification or change which would extend the maturity or reduce
the amount of any payment of principal thereof or which would reduce the rate or
extend the date for payment of interest thereon), (c) amend, modify or change,
or consent or agree to any amendment, modification or change to, any of the
terms of any Indebtedness or Guarantee Obligations other than the Senior
Subordinated Notes and Guarantee Obligations in respect thereof (other than any
such amendment, modification or change which would extend the maturity or reduce
the amount of any payment of principal thereof or which would reduce the rate or
extend the date for payment of interest thereon), except to the extent the same
could not reasonably be expected to have a Material Adverse Effect, (d) amend,
modify or change, or consent to any amendment, modification or change to, any of
the terms of, the Partnership Agreement, the Borrower's certificate of limited
partnership, the Management Agreement or any Joint Venture Charter, except to
the extent the same could not reasonably be expected to have a Material Adverse
Effect, (e) waive or otherwise relinquish any of its rights or causes of action
arising out of the Partnership Agreement, the Borrower's certificate of limited
partnership, the Management Agreement or any Joint Venture Charter, except to
the extent the same could not reasonably be expected to have a Material Adverse
Effect or (f) designate any Indebtedness as "Designated Senior Indebtedness"
under the Senior Subordinated Note Indenture without the consent of the
Administrative Agent (other than the Obligations). Notwithstanding any provision
contained in this subsection 8.9, the Borrower and its Restricted Subsidiaries
shall have the absolute right to amend any Joint Venture Charter to the extent
necessary or reasonably appropriate to evidence the substitution, replacement or
other changes of partners, members or owners in any Joint Venture not in
violation of subsection 8.19 or subsection 8.21.




<PAGE>   68


                                                                              63

                  8.10 Limitation on Transactions with Affiliates. Subject to
the rights set forth in subsection 8.13, enter into any transaction, including,
without limitation, any purchase, sale, lease or exchange of property or the
rendering of any service, with any Affiliate unless such transaction is (a)
otherwise permitted under this Agreement, and (b) except for the Management
Agreement, upon fair and reasonable terms no less favorable to the Borrower or
such Restricted Subsidiary, as the case may be, than it would obtain in a
comparable arm's length transaction with a Person which is not an Affiliate.

                  8.11 Limitation on Sales and Leasebacks. Enter into any
arrangement with any Person providing for the leasing by the Borrower or any
Restricted Subsidiary of real or personal property which has been or is to be
sold or transferred by the Borrower or such Restricted Subsidiary to such Person
or to any other Person to whom funds have been or are to be advanced by such
Person on the security of such property or rental obligations of the Borrower or
such Restricted Subsidiary.

                  8.12 Limitation on Changes in Fiscal Year. Permit the fiscal
year of the Borrower to end on a day other than December 31.

                  8.13 Limitation on Lines of Business. Enter into any business,
either directly or through any Subsidiary or Joint Venture, except for (a)
gathering, transporting (by barge, pipeline, ship, truck or other modes of
hydrocarbon transportation), terminalling, storing, producing, acquiring,
developing, exploring for, processing, dehydrating and otherwise handling
hydrocarbons, including, without limitation, constructing pipeline, platform,
dehydration, processing and other energy-related facilities, and activities or
services reasonably related or ancillary thereto and (b) other businesses as
long as the consolidated total assets principally relating to such other
businesses do not exceed 3% of the consolidated total assets of the Borrower and
its Restricted Subsidiaries at any time.

                  8.14 Corporate Documents. Permit the amendment or modification
of the limited liability company agreement or certificate of formation or
incorporation of any Restricted Subsidiary if such amendment could reasonably be
expected to have a Material Adverse Effect, or would authorize or issue any
Capital Stock not authorized or issued on the Closing Date, except to the extent
such authorization or issuance would have the same substantive effect as any
transaction permitted by subsection 8.5 or 8.6.

                  8.15 Compliance with ERISA. (a) Terminate any Plan so as to
result in any material liability to PBGC, (b) engage in any "prohibited
transaction" (as defined in Section 4975 of the Code) involving any Plan which
could result in a material liability for an excise tax or civil penalty in
connection therewith, (c) incur or suffer to exist any material "accumulated
funding deficiency" (as defined in Section 302 of ERISA), whether or not waived
involving any Plan, or (d) allow or suffer to exist any event or condition,
which presents a material risk of incurring a material liability to PBGC by
reason of termination of any such Plan.

                  8.16 Limitation on Restrictions Affecting Subsidiaries. Enter
into, or suffer to exist, any agreement with any Person, other than the Lenders
pursuant hereto and other than the arrangements described in subsections 8.2(c)
and 8.4(d) or which exist on the Closing Date, which prohibits or limits the
ability of any Restricted Subsidiary to (a) pay dividends or make



<PAGE>   69


                                                                              64

other distributions or pay any Indebtedness owed to the Borrower or any
Restricted Subsidiary, (b) make loans or advances to or make other investments
in the Borrower or any Restricted Subsidiary, (c) transfer any of its properties
or assets to the Borrower or any Restricted Subsidiary, (d) create, incur,
assume or suffer to exist any Lien upon any of its property, assets or revenues,
whether now owned or hereafter acquired.

                  8.17 Creation of Restricted Subsidiaries. Create or acquire
any new Restricted Subsidiary of the Borrower or any of its Restricted
Subsidiaries, unless, immediately upon the creation or acquisition of any such
Restricted Subsidiary, (a) such Restricted Subsidiary shall become party to the
Subsidiaries Guarantee as a Subsidiary Guarantor pursuant to an addendum thereto
or other documentation in form and substance reasonably satisfactory to the
Administrative Agent, (b) such Restricted Subsidiary shall become party to the
Subsidiary Security Agreement as a grantor pursuant to an addendum thereto or
other documentation in form and substance reasonably satisfactory to the
Administrative Agent, and all actions required to perfect the Liens granted
thereby, all filings required thereunder and all consents necessitated thereby
shall have been taken, made or obtained, (c) all Capital Stock issued by such
Restricted Subsidiary owned by the Borrower or any other Restricted Subsidiary
shall have been pledged to the Administrative Agent pursuant to an addendum or
amendment to the Borrower Pledge Agreement or other documentation in form and
substance satisfactory to the Administrative Agent, (d) all corporate, company,
partnership or other proceedings, and all documents, instruments and other legal
matters in connection with the creation of such Restricted Subsidiary and the
transactions contemplated by this subsection 8.17 shall be reasonably
satisfactory in form and substance to the Administrative Agent, and the
Administrative Agent shall have received such other documents and legal opinions
in respect of any aspect or consequence of such creation or such transactions as
it shall reasonably request and (e) no Default or Event of Default shall have
occurred and be continuing after giving effect thereto.

                  8.18 Hazardous Materials. Except to the extent that the same
could not reasonably be expected to have a Material Adverse Effect, permit the
manufacture, storage, transmission or presence of any Hazardous Materials over
or upon any of its properties except in accordance with all applicable
Requirements of Law or release, discharge or otherwise dispose of any Hazardous
Materials on any of its properties except that the Borrower and its Restricted
Subsidiaries may treat, store and transport petroleum, its derivatives,
by-products and other hydrocarbons, hydrogen sulfide and sulfur dioxide in the
ordinary course of their business.

                  8.19 Holding Companies. Notwithstanding any other provisions
of this Agreement and the other Loan Documents, permit any Restricted Subsidiary
which is a general partner in or owner of a general partnership interest in a
Joint Venture to incur or suffer to exist any obligations or indebtedness of any
kind, whether contingent or fixed (excluding any contingent liability of such
Restricted Subsidiary to creditors of such Joint Venture arising solely as a
result of its status as a general partner or owner of such Joint Venture and
Guarantee Obligations referred to in subsections 8.4(d), 8.4(e) and 8.4(f)) or
create or suffer to exist any Liens, in each case except to the extent any such
obligations, indebtedness or Liens arise under or pursuant to the Joint Venture
Charter for such Joint Venture as in effect on the Closing Date (or, if later,
the date of acquisition or formation of such Joint Venture) or the Loan
Documents or are otherwise permitted by the Loan Documents; or permit any
Restricted Subsidiary which is a general partner in or owner of a general
partnership interest in a Joint Venture to acquire any



<PAGE>   70


                                                                              65

property or asset after the Closing Date (or, if later, the date of acquisition
or formation of such Joint Venture) except for distributions made to it by such
Joint Venture; or permit any Restricted Subsidiary which is a general partner in
or owner of a general partnership interest in a Joint Venture to engage in any
business or activity other than holding the general partnership interest in (or
other ownership interest) such Joint Venture held by it on the Closing Date (or,
if later, the date of formation of such Joint Venture).

                  8.20 No Voluntary Termination of Joint Venture Charters.
Permit any Restricted Subsidiary which is a partner in, or owner of any interest
in, any Joint Venture to voluntarily terminate any Joint Venture Charter and
liquidate such Joint Venture to the extent permitted thereunder.

                  8.21 Actions by Joint Ventures. (a) Consent or agree to or
acquiesce in any Joint Venture the interests in which are owned by a Restricted
Subsidiary adversely changing its policy of making distributions of available
cash to partners, or (b) so long as any interest therein is owned by a
Restricted Subsidiary, consent or agree to or acquiesce in any Joint Venture's
taking any actions that could reasonably be expected to have a Material Adverse
Effect.

                  8.22 Hedging Transactions. Enter into any interest rate,
cross-currency, commodity, equity or other security, swap, collar or similar
hedging agreement or purchase any option to purchase or sell or to cap any
interest rate, cross-currency, commodity, equity or other security, in any such
case, other than to hedge risk exposures in the operation of its business,
ownership of assets or the management of its liabilities.


                          SECTION 9. EVENTS OF DEFAULT

                  If any of the following events shall occur and be continuing:

                  (a) The Borrower shall fail to pay any principal of any
         Revolving Credit Note or any Reimbursement Obligation which is not
         funded by a Loan when due in accordance with the terms thereof or
         hereof; or the Borrower shall fail to pay any interest on any Revolving
         Credit Note, or any other amount payable hereunder, within five days
         after any such interest or other amount becomes due in accordance with
         the terms thereof or hereof; or

                  (b) Any representation or warranty made or deemed made by the
         Borrower or any other Loan Party herein or in any other Loan Document
         or which is contained in any certificate, document or financial or
         other statement furnished at any time under or in connection with this
         Agreement shall prove to have been incorrect in any material respect on
         or as of the date made or deemed made; or

                  (c) The Borrower shall default in the observance or
         performance of any agreement contained in Section 8 (other than
         subsection 8.1(a)) or in subsection 7.11; or any Loan Party shall
         default in the observance or performance of any agreement contained in
         Section 5(h), (i), (j) or (o) of the Borrower Security Agreement or the
         Subsidiary Security Agreement, or Section 5(h), (i), (j) or (m) of the
         Leviathan Security



<PAGE>   71


                                                                              66

         Agreement, Section 9(j) of the Leviathan Guarantee, Section 4(b) of the
         Borrower Pledge Agreement or the Leviathan Pledge Agreement (LLC) or
         Section 5(b) of the Leviathan Pledge Agreement (GP); or the Borrower
         shall default in the observance or performance of any agreement
         contained in subsection 8.1(a) and such default shall continue uncured
         for a period of 15 days; or

                  (d) The Borrower or any other Loan Party shall default in the
         observance or performance of any other agreement contained in this
         Agreement or any other Loan Document (other than as provided in
         paragraphs (a) through (c) of this Section), and such default shall
         continue unremedied for a period of 30 days after receipt of written
         notice thereof from the Administrative Agent or any Lender; or

                  (e) Any Loan Party or any Restricted Subsidiary of the
         Borrower shall (i) default in any payment of principal of or interest
         on any Indebtedness (other than the Revolving Credit Notes) or in the
         payment of any Guarantee Obligation, beyond the period of grace (not to
         exceed 30 days), if any, provided in the instrument or agreement under
         which such Indebtedness or Guarantee Obligation was created; or (ii)
         default in the observance or performance of any other agreement or
         condition relating to any such Indebtedness or Guarantee Obligation or
         contained in any instrument or agreement evidencing, securing or
         relating thereto, or any other event shall occur or condition exist,
         the effect of which default or other event or condition is to cause, or
         to permit the holder or holders of such Indebtedness or beneficiary or
         beneficiaries of such Guarantee Obligation (or a trustee or agent on
         behalf of such holder or holders or beneficiary or beneficiaries) to
         cause, with the giving of notice if required, such Indebtedness to
         become due prior to its stated maturity or such Guarantee Obligation to
         become payable; provided, however, that the aggregate principal amount
         of Indebtedness and Guarantee Obligations with respect to which such
         defaults shall have occurred shall equal or exceed $5,000,000; or

                  (f) (i) Any Loan Party or any Restricted Subsidiary of the
         Borrower shall commence any case, proceeding or other action (A) under
         any existing or future law of any jurisdiction, domestic or foreign,
         relating to bankruptcy, insolvency, reorganization or relief of
         debtors, seeking to have an order for relief entered with respect to
         it, or seeking to adjudicate it a bankrupt or insolvent, or seeking
         reorganization, arrangement, adjustment, winding-up, liquidation,
         dissolution, composition or other relief with respect to it or its
         debts, or (B) seeking appointment of a receiver, trustee, custodian,
         conservator or other similar official for it or for all or any
         substantial part of its assets, or any Loan Party or any Subsidiary of
         the Borrower shall make a general assignment for the benefit of its
         creditors; or (ii) there shall be commenced against any Loan Party or
         any Restricted Subsidiary of the Borrower any case, proceeding or other
         action of a nature referred to in clause (i) above which (A) results in
         the entry of an order for relief or any such adjudication or
         appointment or (B) remains undismissed, undischarged or unbonded for a
         period of 60 days; or (iii) there shall be commenced against any Loan
         Party or any Restricted Subsidiary of the Borrower any case, proceeding
         or other action seeking issuance of a warrant of attachment, execution,
         distraint or similar process against all or any substantial part of its
         assets which results in the entry of an order for any such relief which
         shall not have been vacated, discharged, or stayed or bonded pending
         appeal within 60 days from the entry thereof; or (iv) any Loan Party or
         any Restricted Subsidiary of the



<PAGE>   72


                                                                              67

         Borrower shall take any action in furtherance of, or indicating its
         consent to, approval of, or acquiescence in, any of the acts set forth
         in clause (i), (ii), or (iii) above; or (v) any Loan Party or any
         Restricted Subsidiary of the Borrower shall generally not, or shall be
         unable to, or shall admit in writing its inability to, pay its debts as
         they become due; or

                  (g) (i) Any Person shall engage in any "prohibited
         transaction" (as defined in Section 406 of ERISA or Section 4975 of the
         Code) involving any Plan, (ii) any "accumulated funding deficiency" (as
         defined in Section 302 of ERISA), whether or not waived, shall exist
         with respect to any Plan or any Lien in favor of the PBGC or a Plan
         shall arise on the assets of the Borrower or any Commonly Controlled
         Entity, (iii) a Reportable Event shall occur with respect to, or
         proceedings shall commence to have a trustee appointed, or a trustee
         shall be appointed, to administer or to terminate, any Single Employer
         Plan, which Reportable Event or commencement of proceedings or
         appointment of a trustee is, in the reasonable opinion of the Required
         Lenders, likely to result in the termination of such Plan for purposes
         of Title IV of ERISA, (iv) any Single Employer Plan shall terminate for
         purposes of Title IV of ERISA, (v) the Borrower or any Commonly
         Controlled Entity shall, or in the reasonable opinion of the Required
         Lenders is likely to, incur any liability in connection with a
         withdrawal from, or the Insolvency or Reorganization of, a
         Multiemployer Plan or (vi) any other event or condition shall occur or
         exist with respect to a Plan; and in each case in clauses (i) through
         (vi) above, such event or condition, together with all other such
         events or conditions, if any, could have a Material Adverse Effect; or

                  (h) One or more judgments or decrees shall be entered against
         the Borrower or any of its Restricted Subsidiaries involving in the
         aggregate a liability (not paid or fully covered by insurance) of
         $5,000,000 or more, and all such judgments or decrees shall not have
         been vacated, discharged, stayed or bonded pending appeal within 60
         days from the entry thereof;

                  (i) If at any time the Borrower or any Restricted Subsidiary
         shall become liable for remediation and/or environmental compliance
         expenses and/or fines, penalties or other charges which, in the
         aggregate, are in excess of the Material Environmental Amount for any
         Loan Party and the Restricted Subsidiaries; or

                  (j) For any reason (other than any act on the part of the
         Administrative Agent or the Lenders) any Security Document or any
         Guarantee ceases to be in full force and effect or any party thereto
         (other than the Administrative Agent or the Lenders) shall so assert in
         writing or the Lien intended to be created by any Security Document
         ceases to be or is not a valid and perfected Lien having the priority
         contemplated thereby; or

                  (k) A Change of Control shall occur; or

                  (l) Except in connection with transactions permitted by
         subsection 8.5 and 8.6(b), the Borrower shall cease to own legally and
         beneficially at least the percentage of the managing limited liability
         company or other equity interest in each Restricted Subsidiary of the
         Borrower which is a limited liability company owned by it on the date
         hereof (or, if later, the date of acquisition or formation of such
         Subsidiary); or Leviathan



<PAGE>   73


                                                                              68

         and the Borrower together shall cease to own legally and beneficially
         the percentage of the equity interest in each Restricted Subsidiary of
         the Borrower owned by it on the date hereof (or, if later, the date of
         acquisition or formation of such Subsidiary); or

                  (m) Any Person (other than any Lender) shall exercise its
         rights and remedies (other than dilution of the equity interests owned
         by the Borrower and its Restricted Subsidiaries in any Joint Venture
         pursuant to contractual dilution provisions existing with respect to
         the Joint Ventures) with respect to its Lien on any equity interest of
         any Joint Venture the equity interest in which has been pledged to such
         Person; provided that in the case of clause (ii), the amount of claims
         secured by such Lien shall equal or exceed $5,000,000 and such claim
         shall not have been vacated, discharged, stayed or bonded pending
         appeal within 30 days from the entry thereof;

                  (n) (i) The Management Agreement shall cease to be in full
         force and effect prior to the end of the initial term thereof
         substantially as in effect on the date hereof; or (ii) El Paso Energy
         Field Services Inc. or El Paso Energy or any of its wholly-owned
         Subsidiaries shall default in the observance or performance of any
         material provision of the Management Agreement; or

                  (o) the Senior Subordinated Notes or the guarantees thereof
         shall cease, for any reason, to be validly subordinated to the
         Obligations or the obligations of the Subsidiary Guarantors under the
         Loan Documents to which they are parties, as the case may be, as
         provided in the Senior Subordinated Note Indenture, or any Loan Party,
         any Affiliate of any Loan Party, the trustee in respect of the Senior
         Subordinated Notes or the holders of at least 25% in aggregate
         principal amount of the Senior Subordinated Notes shall so assert;

then, and in any such event, (A) if such event is an Event of Default specified
in clause (i) or (ii) of paragraph (f) above with respect to the Borrower,
automatically the Revolving Credit Commitments shall immediately terminate and
the Revolving Credit Loans hereunder (with accrued interest thereon) and all
other amounts owing under this Agreement (including, without limitation, all
amounts of L/C Obligations, whether or not the beneficiaries of the then
outstanding Letters of Credit shall have presented the documents required
thereunder) and the Revolving Credit Notes shall immediately become due and
payable, and (B) if such event is any other Event of Default, either or both of
the following actions may be taken: (i) with the consent of the Required
Lenders, the Administrative Agent may, or upon the request of the Required
Lenders, the Administrative Agent shall, by notice to the Borrower declare the
Revolving Credit Commitments to be terminated forthwith, whereupon the Revolving
Credit Commitments shall immediately terminate; and (ii) with the consent of the
Required Lenders, the Administrative Agent may, or upon the request of the
Required Lenders, the Administrative Agent shall, by notice to the Borrower,
declare the Revolving Credit Loans hereunder (with accrued interest thereon) and
all other amounts owing under this Agreement (including, without limitation, all
amounts of L/C Obligations, whether or not the beneficiaries of the then
outstanding Letters of Credit shall have presented the documents required
thereunder) and the Revolving Credit Notes to be due and payable forthwith,
whereupon the same shall immediately become due and payable. If presentment for
honor under any Letter of Credit shall not have occurred at the time of an
acceleration pursuant to the preceding sentence, the Borrower shall at such time
deposit in a cash



<PAGE>   74


                                                                              69

collateral account opened by the Administrative Agent an amount equal to the
aggregate then undrawn and unexpired amount of the Letters of Credit. The
Borrower hereby grants to the Administrative Agent, for the benefit of the
Issuing Bank and the Lenders, a security interest in such cash collateral to
secure all obligations of the Borrower under this Agreement and the other Loan
Documents. Amounts held in such cash collateral account shall be applied by the
Administrative Agent to the payment of drafts drawn under such Letters of
Credit, and the unused portion thereof after all such Letters of Credit shall
have expired or been fully drawn upon, if any, shall be applied to repay other
obligations of the Borrower hereunder and under the Revolving Credit Notes.
After all such Letters of Credit shall have expired or been fully drawn upon,
all Reimbursement Obligations shall have been satisfied and all other
obligations of the Borrower hereunder and under the Revolving Credit Notes shall
have been paid in full, the balance, if any, in such cash collateral account
shall be returned to the Borrower. The Borrower shall execute and deliver to the
Administrative Agent, for the account of the Issuing Bank and the Lenders, such
further documents and instruments as the Administrative Agent may request to
evidence the creation and perfection of the within security interest in such
cash collateral account. Except as expressly provided above in this Section,
presentment, demand, protest, notice of intent to accelerate, notice of
acceleration and all other notices of any kind are hereby expressly waived.


                      SECTION 10. THE ADMINISTRATIVE AGENT

                  10.1 Appointment. Each Lender hereby irrevocably designates
and appoints The Chase Manhattan Bank as the Administrative Agent of such Lender
under this Agreement and the other Loan Documents, and each such Lender
irrevocably authorizes The Chase Manhattan Bank, as the Administrative Agent for
such Lender, to take such action on its behalf under the provisions of this
Agreement and the other Loan Documents and to exercise such powers and perform
such duties as are expressly delegated to the Administrative Agent by the terms
of this Agreement and the other Loan Documents, together with such other powers
as are reasonably incidental thereto. Notwithstanding any provision to the
contrary elsewhere in this Agreement, the Administrative Agent shall not have
any duties or responsibilities, except those expressly set forth herein, or any
fiduciary relationship with any Lender, and no implied covenants, functions,
responsibilities, duties, obligations or liabilities shall be read into this
Agreement or any other Loan Document or otherwise exist against the
Administrative Agent.

                  10.2 Delegation of Duties. The Administrative Agent may
execute any of its duties under this Agreement and the other Loan Documents by
or through agents or attorneys-in-fact and shall be entitled to advice of
counsel concerning all matters pertaining to such duties. The Administrative
Agent shall not be responsible for the negligence or misconduct of any agents or
attorneys in-fact selected by it with reasonable care.

                  10.3 Exculpatory Provisions. Neither the Administrative Agent
nor any of its officers, directors, employees, agents, attorneys-in-fact or
Affiliates shall be (i) liable for any action lawfully taken or omitted to be
taken by it or such Person under or in connection with this Agreement or any
other Loan Document (except for its or such Person's own gross negligence or
willful misconduct) or (ii) responsible in any manner to any of the Lenders for
any recitals, statements, representations or warranties made by the Borrower or
any officer thereof contained



<PAGE>   75


                                                                              70

in this Agreement or any other Loan Document or in any certificate, report,
statement or other document referred to or provided for in, or received by the
Administrative Agent under or in connection with, this Agreement or any other
Loan Document or for the value, validity, effectiveness, genuineness,
enforceability or sufficiency of this Agreement or the Revolving Credit Notes or
any other Loan Document or for any failure of the Borrower to perform its
obligations hereunder or thereunder. The Administrative Agent shall not be under
any obligation to any Lender to ascertain or to inquire as to the observance or
performance of any of the agreements contained in, or conditions of, this
Agreement or any other Loan Document, or to inspect the properties, books or
records of the Borrower.

                  10.4 Reliance by Administrative Agent. The Administrative
Agent shall be entitled to rely, and shall be fully protected in relying, upon
any Revolving Credit Note, writing, resolution, notice, consent, certificate,
affidavit, letter, telecopy, telex or teletype message, statement, order or
other document or conversation believed by it to be genuine and correct and to
have been signed, sent or made by the proper Person or Persons and upon advice
and statements of legal counsel (including, without limitation, counsel to the
Borrower), independent accountants and other experts selected by the
Administrative Agent. The Administrative Agent may deem and treat the payee of
any Revolving Credit Note as the owner thereof for all purposes unless a written
notice of assignment, negotiation or transfer thereof shall have been filed with
the Administrative Agent. The Administrative Agent shall be fully justified in
failing or refusing to take any action under this Agreement or any other Loan
Document unless it shall first receive such advice or concurrence of the
Required Lenders as it deems appropriate or it shall first be indemnified to its
satisfaction by the Lenders against any and all liability and expense which may
be incurred by it by reason of taking or continuing to take any such action. The
Administrative Agent shall in all cases be fully protected in acting, or in
refraining from acting, under this Agreement and the Revolving Credit Notes and
the other Loan Documents in accordance with a request of the Required Lenders,
and such request and any action taken or failure to act pursuant thereto shall
be binding upon all the Lenders and all future holders of the Revolving Credit
Notes.

                  10.5 Notice of Default. The Administrative Agent shall not be
deemed to have knowledge or notice of the occurrence of any Default or Event of
Default hereunder unless the Administrative Agent has received notice from a
Lender or the Borrower referring to this Agreement, describing such Default or
Event of Default and stating that such notice is a "notice of default". In the
event that the Administrative Agent receives such a notice, the Administrative
Agent shall give notice thereof to the Lenders. The Administrative Agent shall
take such action with respect to such Default or Event of Default as shall be
reasonably directed by the Required Lenders; provided that unless and until the
Administrative Agent shall have received such directions, the Administrative
Agent may (but shall not be obligated to) take such action, or refrain from
taking such action, with respect to such Default or Event of Default as it shall
deem advisable in the best interests of the Lenders.

                  10.6 Non-Reliance on Administrative Agent and Other Lenders.
Each Lender expressly acknowledges that neither the Administrative Agent nor any
of its officers, directors, employees, agents, attorneys-in-fact or Affiliates
has made any representations or warranties to it and that no act by the
Administrative Agent hereafter taken, including any review of the affairs of the
Borrower, shall be deemed to constitute any representation or warranty by the
Administrative



<PAGE>   76


                                                                              71

Agent to any Lender. Each Lender represents to the Administrative Agent that it
has, independently and without reliance upon the Administrative Agent or any
other Lender, and based on such documents and information as it has deemed
appropriate, made its own appraisal of and investigation into the business,
operations, property, financial and other condition and creditworthiness of the
Borrower and made its own decision to make its Loans hereunder and enter into
this Agreement. Each Lender also represents that it will, independently and
without reliance upon the Administrative Agent or any other Lender, and based on
such documents and information as it shall deem appropriate at the time,
continue to make its own credit analysis, appraisals and decisions in taking or
not taking action under this Agreement and the other Loan Documents, and to make
such investigation as it deems necessary to inform itself as to the business,
operations, property, financial and other condition and creditworthiness of the
Borrower. Except for notices, reports and other documents expressly required to
be furnished to the Lenders by the Administrative Agent hereunder, the
Administrative Agent shall not have any duty or responsibility to provide any
Lender with any credit or other information concerning the business, operations,
property, condition (financial or otherwise), prospects or creditworthiness of
the Borrower which may come into the possession of the Administrative Agent or
any of its officers, directors, employees, agents, attorneys-in-fact or
Affiliates.

                  10.7 Indemnification. The Lenders agree to indemnify the
Administrative Agent in its capacity as such (to the extent not reimbursed by
the Borrower and without limiting the obligation of the Borrower to do so),
ratably according to their respective Commitment Percentages in effect on the
date on which indemnification is sought under this subsection, from and against
any and all liabilities, obligations, losses, damages, penalties, actions,
judgments, suits, costs, expenses or disbursements of any kind whatsoever which
may at any time (including, without limitation, at any time following the
payment of the Revolving Credit Notes) be imposed on, incurred by or asserted
against the Administrative Agent in any way relating to or arising out of this
Agreement, any of the other Loan Documents or any documents contemplated by or
referred to herein or therein or the transactions contemplated hereby or thereby
or any action taken or omitted by the Administrative Agent under or in
connection with any of the foregoing; provided that no Lender shall be liable
for the payment of any portion of such liabilities, obligations, losses,
damages, penalties, actions, judgments, suits, costs, expenses or disbursements
resulting solely from the Administrative Agent's gross negligence or willful
misconduct. The agreements in this subsection shall survive the payment of the
Revolving Credit Notes and all other amounts payable hereunder.

                  10.8 Administrative Agent in Its Individual Capacity. The
Administrative Agent and its Affiliates may make loans to, accept deposits from
and generally engage in any kind of business with the Borrower as though the
Administrative Agent were not the Administrative Agent hereunder and under the
other Loan Documents. With respect to its Loans made or renewed by it and any
Revolving Credit Note issued to it and with respect to the Letters of Credit,
the Administrative Agent shall have the same rights and powers under this
Agreement and the other Loan Documents as any Lender and may exercise the same
as though it were not the Administrative Agent. The terms "Lender" and "Lenders"
shall include the Administrative Agent in its individual capacity.

                  10.9 Successor Administrative Agent. The Administrative Agent
may resign as Administrative Agent upon 10 days' written notice to the Lenders.
If the Administrative Agent



<PAGE>   77


                                                                              72

shall resign as Administrative Agent under this Agreement and the other Loan
Documents, then the Required Lenders shall appoint from among the Lenders a
successor agent for the Lenders, which successor agent shall be approved by the
Borrower, whereupon such successor agent shall succeed to the rights, powers and
duties of the Administrative Agent, and the term "Administrative Agent" shall
mean such successor agent effective upon such appointment and approval, and the
former Administrative Agent's rights, powers and duties as Administrative Agent
shall be terminated, without any other or further act or deed on the part of
such former Administrative Agent or any of the parties to this Agreement or any
holders of the Revolving Credit Notes. After any retiring Administrative Agent's
resignation as Administrative Agent, the provisions of this subsection shall
inure to its benefit as to any actions taken or omitted to be taken by it while
it was Administrative Agent under this Agreement and the other Loan Documents.

                  10.10 Other Agents. Neither the Syndication Agent nor the
Documentation Agent shall have any rights or obligations in its capacity as
such.


                            SECTION 11. MISCELLANEOUS

                  11.1 Amendments and Waivers. Neither this Agreement, any
Revolving Credit Note, any other Loan Document, nor any terms hereof or thereof
may be amended, supplemented or modified except in accordance with the
provisions of this subsection. The Required Lenders may, or, with the written
consent of the Required Lenders, the Administrative Agent may, from time to
time, (a) enter into with the Borrower or the Loan party thereto written
amendments, supplements or modifications hereto and to the Revolving Credit
Notes and the other Loan Documents for the purpose of adding any provisions to
this Agreement or the Revolving Credit Notes or the other Loan Documents or
changing in any manner the rights of the Lenders or of the Borrower or any other
Loan Party hereunder or thereunder or (b) waive in writing, on such terms and
conditions as the Required Lenders or the Administrative Agent, as the case may
be, may specify in such instrument, any of the requirements of this Agreement or
the Revolving Credit Notes or the other Loan Documents or any Default or Event
of Default and its consequences; provided, however, that no such waiver and no
such amendment, supplement or modification shall (i) reduce the amount or extend
the scheduled date of maturity of any Revolving Credit Note or of any
installment thereof, or reduce the stated rate of any interest or fee payable
hereunder or extend the scheduled date of any payment thereof or increase the
amount or extend the expiration date of any Lender's Revolving Credit
Commitment, in each case without the consent of each Lender affected thereby, or
(ii) amend, modify or waive any provision of this subsection or reduce the
percentage specified in the definition of Required Lenders, or consent to the
assignment or transfer by the Borrower of any of its rights and obligations
under this Agreement and the other Loan Documents (except in a transaction
permitted by subsection 8.5), in each case without the written consent of all
the Lenders, or (iii) amend, modify or waive any provision of Section 10 without
the written consent of the then Administrative Agent, (iv) release the Lenders'
Liens on all or substantially all of the Collateral under the Security Documents
without the consent of each Lender or (v) except to the extent relating to the
Redesignation of any Restricted Subsidiary, the sale or other disposition of any
Restricted Subsidiary as otherwise permitted by this Agreement or any other
transaction permitted by this Agreement, release any Guarantee. Any such waiver
and any such amendment, supplement or modification shall apply



<PAGE>   78


                                                                              73

equally to each of the Lenders and shall be binding upon the Borrower, the
Lenders, the Administrative Agent and all future holders of the Revolving Credit
Notes. In the case of any waiver, the Borrower, the Lenders and the
Administrative Agent shall be restored to their former position and rights
hereunder and under the outstanding Revolving Credit Notes and any other Loan
Documents, and any Default or Event of Default waived shall be deemed to be
cured and not continuing; but no such waiver shall extend to any subsequent or
other Default or Event of Default, or impair any right consequent thereon.

                  11.2 Notices. All notices, requests and demands to or upon the
respective parties hereto to be effective shall be in writing (including by
telecopy), and, unless otherwise expressly provided herein, shall be deemed to
have been duly given or made when delivered by hand, or three days after being
deposited in the mail, postage prepaid, or, in the case of telecopy notice, when
received, addressed as follows in the case of the Borrower and the
Administrative Agent, and as set forth in Schedule I in the case of the other
parties hereto, or to such other address as may be hereafter notified by the
respective parties hereto and any future holders of the Revolving Credit Notes:

         The Borrower:              Leviathan Gas Pipeline Partners, L.P.
                                    El Paso Energy Building
                                    1001 Louisiana Street
                                    Houston, Texas  77002
                                    Attention:  Chief Financial Officer
                                    Telecopy:  (713) 420-5477

         with a copy to:            Akin, Gump, Strauss, Hauer & Feld, L.L.P.
                                    711 Louisiana, Suite 1900
                                    Houston, Texas  77002
                                    Telecopy: (713) 236-0822
                                    Attention:  J. Vincent Kendrick, Esq.

         The Administrative Agent:  The Chase Manhattan Bank
                                    One Chase Manhattan Plaza
                                    8th Floor
                                    New York, New York  10081
                                    Attention:  Lisa Pucciarelli
                                    Telecopy:   (212) 552-5777

provided that any notice, request or demand to or upon the Administrative Agent
or the Lenders pursuant to subsection 2.3, 3.2, 2.6, 2.7, 2.11, 4.1 or 4.2 shall
not be effective until received, provided, further, that the failure by the
Administrative Agent or any Lender to provide a copy to the Borrower's counsel
shall not cause any notice to the Borrower to be ineffective.




<PAGE>   79


                                                                              74

                  11.3 No Waiver; Cumulative Remedies. No failure to exercise
and no delay in exercising, on the part of the Administrative Agent or any
Lender, any right, remedy, power or privilege hereunder shall operate as a
waiver thereof; nor shall any single or partial exercise of any right, remedy,
power or privilege hereunder preclude any other or further exercise thereof or
the exercise of any other right, remedy, power or privilege. The rights,
remedies, powers and privileges herein provided are cumulative and not exclusive
of any rights, remedies, powers and privileges provided by law.

                  11.4 Survival of Representations and Warranties. All
representations and warranties made hereunder and in any document, certificate
or statement delivered pursuant hereto or in connection herewith shall survive
the execution and delivery of this Agreement and the Revolving Credit Notes.

                  11.5 Payment of Expenses and Taxes. The Borrower agrees (a) to
pay or reimburse the Administrative Agent for all its reasonable out-of-pocket
costs and expenses incurred in connection with the development, preparation and
execution of, and any amendment, supplement or modification to, this Agreement
and the Revolving Credit Notes and the other Loan Documents and any other
documents prepared in connection herewith or therewith, and the consummation and
administration of the transactions contemplated hereby and thereby, including,
without limitation, the fees and disbursements of counsel to the Administrative
Agent, (b) to pay or reimburse each Lender and the Administrative Agent for all
its costs and expenses incurred in connection with the enforcement or
preservation of any rights under this Agreement, the Revolving Credit Notes, the
other Loan Documents and any such other documents, including, without
limitation, the fees and disbursements of counsel to the Administrative Agent
and to the several Lenders, (c) to pay, indemnify, and hold each Lender and the
Administrative Agent harmless from, any and all recording and filing fees and
any and all liabilities with respect to, or resulting from any delay in paying,
stamp, excise and other taxes, if any, which may be payable or determined to be
payable in connection with the execution and delivery of, or consummation or
administration of any of the transactions contemplated by, or any amendment,
supplement or modification of, or any waiver or consent under or in respect of,
this Agreement, the Revolving Credit Notes, the other Loan Documents and any
such other documents, and (d) to pay, indemnify, and hold each Lender and the
Administrative Agent harmless from and against any and all other liabilities,
obligations, losses, damages, penalties, actions, judgments and suits, and
reasonable costs, expenses or disbursements, of any kind or nature whatsoever
with respect to the execution, delivery, enforcement, performance and
administration of this Agreement, the Revolving Credit Notes and the other Loan
Documents, the use of the proceeds of the Revolving Credit Loans, including the
use and reliance on electronic, telecommunications or other information or
transmission systems in connection with the Loan Documents (all the foregoing in
this clause (d), collectively, the "indemnified liabilities"), REGARDLESS OF
WHETHER OR NOT SUCH INDEMNIFIED LIABILITIES ARE IN ANY WAY OR TO ANY EXTENT
CAUSED, IN WHOLE OR IN PART, BY ANY NEGLIGENT ACT OR OMISSION OF ANY KIND BY THE
ADMINISTRATIVE AGENT OR ANY LENDER, provided, that the Borrower shall have no
obligation hereunder to the Administrative Agent or any Lender with respect to
indemnified liabilities arising from (i) the gross negligence or willful
misconduct of the Administrative Agent or any such Lender or (ii) legal
proceedings commenced against the Administrative Agent or any such Lender by any
security holder or creditor thereof arising out of and based upon rights
afforded any such security holder or creditor solely in its capacity as such.



<PAGE>   80


                                                                              75

The agreements in this subsection shall survive repayment of the Revolving
Credit Notes and all other amounts payable hereunder.

                  11.6 Successors and Assigns; Participations; Purchasing
Lenders. (a) This Agreement shall be binding upon and inure to the benefit of
the Borrower, the Lenders, the Administrative Agent, all future holders of the
Revolving Credit Notes and their respective successors and assigns, except that
the Borrower may not assign or transfer any of its rights or obligations under
this Agreement without the prior written consent of each Lender.

                  (b) Any Lender may, in the ordinary course of its commercial
banking business and in accordance with applicable law, and after notice to the
Borrower, at any time sell to one or more banks or other entities
("Participants") participating interests in any Revolving Credit Loan owing to
such Lender, any Revolving Credit Note held by such Lender, any Revolving Credit
Commitment of such Lender or any other interest of such Lender hereunder and
under the other Loan Documents. In the event of any such sale by a Lender of a
participating interest to a Participant, such Lender's obligations under this
Agreement to the other parties to this Agreement shall remain unchanged, such
Lender shall remain solely responsible for the performance thereof, such Lender
shall remain the holder of any such Revolving Credit Note for all purposes under
this Agreement and the other Loan Documents, and the Borrower and the
Administrative Agent shall continue to deal solely and directly with such Lender
in connection with such Lender's rights and obligations under this Agreement and
the other Loan Documents. The Borrower agrees that if amounts outstanding under
this Agreement and the Revolving Credit Notes are due or unpaid, or shall have
been declared or shall have become due and payable upon the occurrence of an
Event of Default, each Participant shall be deemed to have the right of setoff
in respect of its participating interest in amounts owing under this Agreement
and any Revolving Credit Note to the same extent as if the amount of its
participating interest were owing directly to it as a Lender under this
Agreement or any Revolving Credit Note, provided that, in purchasing such
participating interest, such Participant shall be deemed to have agreed to share
with the Lenders the proceeds thereof as provided in subsection 11.7(a) as fully
as if it were a Lender hereunder. The Borrower also agrees that each Participant
shall be entitled to the benefits of subsections 4.9, 4.10 and 4.11 with respect
to its participation in the Revolving Credit Commitments, the Revolving Credit
Loans and the Letters of Credit outstanding from time to time; provided, that no
Participant shall be entitled to receive any greater amount pursuant to such
subsections than the transferor Lender would have been entitled to receive in
respect of the amount of the participation transferred by such transferor Lender
to such Participant had no such transfer occurred. No Lender shall be entitled
to create in favor of any Participant, in the participation agreement pursuant
to which such Participant's participating interest shall be created or
otherwise, any right to vote on, consent to or approve any matter relating to
this Agreement or any other Loan Document except for those specified in clauses
(i) to (v) of the proviso of subsection 11.1(b) to the extent the Participant is
directly affected thereby.

                  (c) Any Lender may, in the ordinary course of its business and
in accordance with applicable law, at any time sell to any Lender or any
successor or affiliate thereof and, with the consent of the Borrower and the
Administrative Agent (which in each case shall not be unreasonably withheld), to
one or more additional banks or financial institutions or funds that regularly
purchase loans ("Purchasing Lenders") all or any part of its rights and
obligations under this Agreement and the Revolving Credit Notes pursuant to an
Assignment and Acceptance,



<PAGE>   81


                                                                              76

substantially in the form of Exhibit M, executed by such Purchasing Lender, such
transferor Lender (and, in the case of a Purchasing Lender that is not then a
Lender or an affiliate thereof, by the Borrower and the Administrative Agent)
and delivered to the Administrative Agent for its acceptance and recording in
the Register ,provided that no such assignment to an assignee (other than any
Lender or any affiliate of any Lender) shall be in an aggregate principal amount
of less than $10,000,000 (other than in the case of an assignment of all of a
Lender's interest under this Agreement) and the assigning Lender shall have
retained at least $10,000,000 of Revolving Credit Commitments (unless it is
assigning all of its Revolving Credit Commitments and Revolving Credit Loans),
unless otherwise agreed by the Borrower and the Administrative Agent. For
purposes of the proviso contained in the preceding sentence, the amount
described therein shall be aggregated in respect to each Lender and its related
affiliates, if any. Upon such execution, delivery, acceptance and recording,
from and after the Transfer Effective Date determined pursuant to such
Assignment and Acceptance, (x) the Purchasing Lender thereunder shall be a party
hereto and, to the extent provided in such Assignment and Acceptance, have the
rights and obligations of a Lender hereunder with a Revolving Credit Commitment
as set forth therein, and (y) the transferor Lender thereunder shall, to the
extent provided in such Assignment and Acceptance, be released from its
obligations under this Agreement (and, in the case of an Assignment and
Acceptance covering all or the remaining portion of a transferor Lender's rights
and obligations under this Agreement, such transferor Lender shall cease to be a
party hereto but shall continue to be entitled to the benefit of the indemnity
and expense reimbursement provisions of the Loan Documents to the extent
relating to matters during the time it was a Lender). Such Assignment and
Acceptance shall be deemed to amend this Agreement to the extent, and only to
the extent, necessary to reflect the addition of such Purchasing Lender and the
resulting adjustment of Commitment Percentages arising from the purchase by such
Purchasing Lender of all or a portion of the rights and obligations of such
transferor Lender under this Agreement and the Revolving Credit Notes. On or
prior to the Transfer Effective Date determined pursuant to such Assignment and
Acceptance, the Borrower, at its own expense, shall execute and deliver to the
Administrative Agent in exchange for the Revolving Credit Note of the transferor
Lender a new Revolving Credit Note to the order of such Purchasing Lender in an
amount equal to the Revolving Credit Commitment assumed by it pursuant to such
Assignment and Acceptance and, if the transferor Lender has retained Revolving
Credit Commitments hereunder, a new Revolving Credit Note to the order of the
transferor Lender in an amount equal to the Revolving Credit Commitment retained
by it hereunder. Such new Revolving Credit Notes shall be dated the Closing
Date, and shall otherwise be in the form of the Revolving Credit Note replaced
thereby. The Revolving Credit Notes surrendered by the transferor Lender shall
be returned by the Administrative Agent to the Borrower marked "cancelled".

                  (d) The Administrative Agent, on behalf of the Borrower, shall
maintain at its address referred to in subsection 11.2 a copy of each Assignment
and Acceptance delivered to it and a register (the "Register") for the
recordation of the names and addresses of the Lenders and the Revolving Credit
Commitment of, and principal amount of the Revolving Credit Loans owing to, each
Lender from time to time. The entries in the Register shall be conclusive, in
the absence of manifest error, and the Borrower, the Administrative Agent and
the Lenders may treat each Person whose name is recorded in the Register as the
owner of the Revolving Credit Loan recorded therein for all purposes of this
Agreement, notwithstanding any notice to the contrary. Any assignment of any
Revolving Credit Loan or other Obligations hereunder not evidenced by a
Revolving Credit Note shall be effective only upon appropriate entries with
respect thereto being



<PAGE>   82


                                                                              77

made in the Register. The Register shall be available for inspection by the
Borrower or any Lender at any reasonable time and from time to time upon
reasonable prior notice.

                  (e) Upon its receipt of an Assignment and Acceptance executed
by a transferor Lender and Purchasing Lender (and, in the case of a Purchasing
Lender that is not then a Lender or an affiliate thereof, by the Borrower and
the Administrative Agent) together with payment to the Administrative Agent of a
registration and processing fee of $4,000, the Administrative Agent shall (i)
promptly accept such Assignment and Acceptance and (ii) on the Transfer
Effective Date determined pursuant thereto record the information contained
therein in the Register and give notice of such acceptance and recordation to
the Lenders and the Borrower.

                  (f) The Borrower authorizes each Lender to disclose to any
Participant or Purchasing Lender (each, a "Transferee") and any prospective
Transferee any and all financial information in such Lender's possession
concerning the Borrower and its Affiliates which has been delivered to such
Lender by or on behalf of the Borrower pursuant to this Agreement or which has
been delivered to such Lender by or on behalf of the Borrower in connection with
such Lender's credit evaluation of the Borrower and its Affiliates prior to
becoming a party to this Agreement.

                  (g) For avoidance of doubt, the parties to this Agreement
acknowledge that the provisions of this subsection concerning assignments of
Revolving Credit Loans and Revolving Credit Notes relate only to absolute
assignments and that such provisions do not prohibit assignments creating
security interests, including, without limitation, any pledge or assignment by a
Lender of any Revolving Credit Loan or Revolving Credit Note to any Federal
Reserve Bank in accordance with applicable law.

                  11.7 Adjustments; Set-off. (a) If any Lender (a "benefitted
Lender") shall at any time receive any payment of all or part of its Loans or
the Reimbursement Obligations owing to it, or interest thereon, or receive any
collateral in respect thereof (whether voluntarily or involuntarily, by set-off,
pursuant to events or proceedings of the nature referred to in Section 9(i), or
otherwise), in a greater proportion than any such payment to or collateral
received by any other Lender, if any, in respect of such other Lender's Loans of
the same type or the Reimbursement Obligations owing to it, as the case may be,
or interest thereon, such benefitted Lender shall purchase for cash from the
other Lenders a participating interest in such portion of each such other
Lender's Loan or the Reimbursement Obligations owing to it, or shall provide
such other Lenders with the benefits of any such collateral, or the proceeds
thereof, as shall be necessary to cause such benefitted Lender to share the
excess payment or benefits of such collateral or proceeds ratably with each of
the Lenders; provided, however, that if all or any portion of such excess
payment or benefits is thereafter recovered from such benefitted Lender, such
purchase shall be rescinded, and the purchase price and benefits returned, to
the extent of such recovery, but without interest.

                  (b) In addition to any rights and remedies of the Lenders
provided by law, each Lender shall have the right, without prior notice to the
Borrower, any such notice being expressly waived by the Borrower to the extent
permitted by applicable law, upon any amount becoming due and payable by the
Borrower hereunder or under the Revolving Credit Notes (whether at the stated
maturity, by acceleration or otherwise) to set-off and appropriate and apply
against such



<PAGE>   83


                                                                              78

amount any and all deposits (general or special, time or demand, provisional or
final), in any currency, and any other credits, indebtedness or claims, in any
currency, in each case whether direct or indirect, absolute or contingent,
matured or unmatured, at any time held or owing by such Lender or any branch or
agency thereof to or for the credit or the account of the Borrower. Each Lender
agrees promptly to notify the Borrower and the Administrative Agent after any
such set-off and application made by such Lender, provided that the failure to
give such notice shall not affect the validity of such set-off and application.

                  11.8 Counterparts. This Agreement may be executed by one or
more of the parties to this Agreement on any number of separate counterparts,
and all of said counterparts taken together shall be deemed to constitute one
and the same instrument. A set of the copies of this Agreement signed by all the
parties shall be lodged with the Borrower and the Administrative Agent.

                  11.9 Severability. Any provision of this Agreement which is
prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction,
be ineffective to the extent of such prohibition or unenforceability without
invalidating the remaining provisions hereof, and any such prohibition or
unenforceability in any jurisdiction shall not invalidate or render
unenforceable such provision in any other jurisdiction.

                  11.10 Integration. This Agreement and the other Loan Documents
represent the agreement of the Borrower, the Administrative Agent and the
Lenders with respect to the subject matter hereof, and there are no promises,
undertakings, representations or warranties by the Administrative Agent or any
Lender relative to subject matter hereof not expressly set forth or referred to
herein or in the other Loan Documents.

                  11.11 Usury Savings Clause. It is the intention of the parties
hereto to comply with applicable usury laws (now or hereafter enacted);
accordingly, notwithstanding any provision to the contrary in this Agreement,
the Revolving Credit Notes, any of the other Loan Documents or any other
document related hereto, in no event shall this Agreement or any such other
document require the payment or permit the collection of interest in excess of
the maximum amount permitted by such laws. If from any circumstances whatsoever,
fulfillment of any provision of this Agreement or of any other document
pertaining hereto or thereto, shall involve transcending the limit of validity
prescribed by applicable law for the collection or charging of interest, then,
ipso facto, the obligation to be fulfilled shall be reduced to the limit of such
validity, and if from any such circumstances the Administrative Agent and the
Lenders shall ever receive anything of value as interest or deemed interest by
applicable law under this Agreement, the Revolving Credit Notes, any of the
other Loan Documents or any other document pertaining hereto or otherwise an
amount that would exceed the highest lawful rate, such amount that would be
excessive interest shall be applied to the reduction of the principal amount
owing under the Revolving Credit Notes or on account of any other indebtedness
of the Borrower, and not to the payment of interest, or if such excessive
interest exceeds the unpaid balance of principal of such indebtedness, such
excess shall be refunded to the Borrower. In determining whether or not the
interest paid or payable with respect to any indebtedness of the Borrower to the
Administrative Agent and the Lenders, under any specified contingency, exceeds
the Highest Lawful Rate (as hereinafter defined), the Borrower, the
Administrative Agent and the Lenders shall, to the maximum extent permitted by
applicable law, (a) characterize any non-principal



<PAGE>   84


                                                                              79

payment as an expense, fee or premium rather than as interest, (b) exclude
voluntary prepayments and the effects thereof, (c) amortize, prorate, allocate
and spread the total amount of interest throughout the full term of such
indebtedness so that interest thereon does not exceed the maximum amount
permitted by applicable law, and/or (d) allocate interest between portions of
such indebtedness, to the end that no such portion shall bear interest at a rate
greater than that permitted by applicable law.

                  To the extent that Article 5069-1D.001 et seq., as amended, of
the Texas Revised Civil Statutes is relevant to the Administrative Agent and the
Lenders for the purpose of determining the Highest Lawful Rate, the
Administrative Agent and the Lenders hereby elect to determine the applicable
rate ceiling under such Article by the indicated (weekly) rate ceiling from time
to time in effect. Nothing set forth in this subsection 11.11 is intended to or
shall limit the effect or operation of subsection 11.12. In no event shall
Chapter 346 of the Texas Finance Code (which regulates certain revolving credit
loan accounts) apply to this Agreement or the Revolving Credit Notes.

                   For purposes of this subsection 11.11, "Highest Lawful Rate"
shall mean the maximum rate of nonusurious interest that may be contracted for,
charged, taken, reserved or received on the Revolving Credit Notes under laws
applicable to the Administrative Agent and the Lenders.

                  11.12  GOVERNING LAW.  THIS AGREEMENT AND THE REVOLVING
CREDIT NOTES AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES UNDER THIS AGREEMENT
AND THE REVOLVING CREDIT NOTES SHALL BE GOVERNED BY, AND CONSTRUED AND
INTERPRETED IN ACCORDANCE WITH, THE LAW OF THE STATE OF NEW YORK.

                  11.13 Submission To Jurisdiction; Waivers. The Borrower hereby
irrevocably and unconditionally:

                  (a) submits for itself and its property in any legal action or
         proceeding relating to this Agreement and the other Loan Documents to
         which it is a party, or for recognition and enforcement of any
         judgement in respect thereof, to the non-exclusive general jurisdiction
         of the Courts of the State of New York, the courts of the United States
         of America for the Southern District of New York, and appellate courts
         from any thereof;

                  (b) consents that any such action or proceeding may be brought
         in such courts and waives any objection that it may now or hereafter
         have to the venue of any such action or proceeding in any such court or
         that such action or proceeding was brought in an inconvenient court and
         agrees not to plead or claim the same;

                  (c) agrees that service of process in any such action or
         proceeding may be effected by mailing a copy thereof by registered or
         certified mail (or any substantially similar form of mail), postage
         prepaid, to the Borrower at its address set forth in subsection 11.2 or
         at such other address of which the Administrative Agent shall have been
         notified pursuant thereto;



<PAGE>   85
                                                                             80

                  (d) agrees that nothing herein shall affect the right to
         effect service of process in any other manner permitted by law or shall
         limit the right to sue in any other jurisdiction; and

                  (e) waives, to the maximum extent not prohibited by law, any
         right it may have to claim or recover in any legal action or proceeding
         referred to in this subsection any special, exemplary or punitive
         damages (including, without limitation, damages arising from the use of
         electronic, telecommunications or other information transmissions
         systems in connection with the Loan Documents).

                  11.14 Acknowledgements. The Borrower hereby acknowledges that:

                  (a) it has been advised by counsel in the negotiation,
         execution and delivery of this Agreement and the Revolving Credit Notes
         and the other Loan Documents;

                  (b) neither the Administrative Agent nor any Lender has any
         fiduciary relationship with or duty to the Borrower or any other Loan
         Party arising out of or in connection with this Agreement or any of the
         other Loan Documents, and the relationship between Administrative Agent
         and Lenders, on one hand, and the Borrower and the other Loan Parties,
         on the other hand, in connection herewith or therewith is solely that
         of debtor and creditor; and

                  (c) no joint venture exists among the Lenders or among the
         Borrower and the other Loan Parties and the Lenders.

                  11.15 Confidentiality. Each of the Administrative Agent and
each Lender agrees that it will hold in confidence, any information provided to
such Person pursuant to this Agreement; provided, that nothing in this
subsection 11.15 shall be deemed to prevent the disclosure by the Administrative
Agent or any Lender of any such information (a) to any employee, officer,
director, accountant, attorney or consultant of such Person, or any examiner or
other Governmental Authority, (b) that has been or is made public by Leviathan,
the Borrower or any of its Subsidiaries or Affiliates or by any third party
without breach of this Agreement or that otherwise becomes generally available
to the public other than as a result of a disclosure in violation of this
subsection 11.15, (c) that is or becomes available to any such Person from a
third party on a non-confidential basis, (d) that is required to be disclosed by
any Requirement of Law, including to any bank examiners or regulatory
authorities, (e) that is required to be disclosed by any court, agency,
arbitrator or legislative body, or (f) to any Transferee or proposed Transferee.

                  11.16  WAIVERS OF JURY TRIAL.  THE BORROWER, THE
ADMINISTRATIVE AGENT AND THE LENDERS HEREBY IRREVOCABLY AND UNCONDITIONALLY
WAIVE TRIAL BY JURY IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT
OR THE REVOLVING CREDIT NOTES OR ANY OTHER LOAN DOCUMENT AND FOR ANY
COUNTERCLAIM THEREIN.




<PAGE>   86


                                                                             81

                  11.17 ACKNOWLEDGEMENT OF NO CLAIMS, OFFSETS OR DEFENSES;
RELEASE BY THE LOAN PARTIES. BORROWER, ON BEHALF OF ITSELF AND EACH OF THE OTHER
LOAN PARTIES, ACKNOWLEDGES THAT NO LOAN PARTY NOR ANY OF THEIR RESPECTIVE
OWNERS, DIRECTORS, SUCCESSORS, ASSIGNS, AGENTS, OFFICERS, EMPLOYEES, AND
REPRESENTATIVES (COLLECTIVELY, THE "BORROWER AFFILIATES PARTIES") HAS ANY CLAIM,
DEMAND, RIGHT OF OFFSET, CAUSE OF ACTION IN LAW OR IN EQUITY, LIABILITY OR
DAMAGES OF ANY NATURE WHATSOEVER, WHETHER FIXED OR CONTINGENT (HEREINAFTER
COLLECTIVE CALLED "CLAIMS") THAT COULD BE ASSERTED IN CONNECTION WITH, OR WHICH
WOULD IN ANY OTHER MANNER BE RELATED TO, THE EXISTING CREDIT AGREEMENT OR ANY
PROMISSORY NOTES OR OTHER AGREEMENTS, TRANSACTIONS OR OTHER ACTIONS PRIOR TO THE
DATE HEREOF INVOLVING ANY OF THE BORROWER AFFILIATED PARTIES AND LENDERS ("THE
PRIOR AGREEMENTS AND ACTIVITIES"). NOTWITHSTANDING THE FOREGOING, HOWEVER,
BORROWER HEREBY AGREES THAT IN CONSIDERATION OF THE CREDIT EXTENDED TO BORROWER
UNDER THE LOAN DOCUMENTS AND AS A MATERIAL INDUCEMENT TO THE LENDERS TO ENTER
INTO SUCH LOAN DOCUMENTS AND EXTEND SUCH CREDIT TO BORROWER, BORROWER, ON BEHALF
OF ITSELF AND ALL OF THE OTHER BORROWER AFFILIATED PARTIES HEREBY RELEASES AND
FOREVER DISCHARGES, EACH LENDER, EACH SUBSEQUENT HOLDER OF ANY OF THE REVOLVING
CREDIT NOTES, AND EACH AND ALL OF THEIR PARENT, SUBSIDIARY AND AFFILIATED
CORPORATIONS PAST AND PRESENT, AS WELL AS THEIR RESPECTIVE OWNERS, DIRECTORS,
SUCCESSORS, ASSIGNS, AGENTS, OFFICERS, EMPLOYEES, AND REPRESENTATIVES
(COLLECTIVELY, THE "RELEASED PARTIES"), OF AND FROM ANY AND ALL CLAIMS WHICH
BORROWER AND THE OTHER BORROWER AFFILIATED PARTIES MAY HAVE OR HEREAFTER ACQUIRE
AGAINST ANY OR ALL OF THE RELEASED PARTIES BY REASON OF, OR RELATED IN ANY WAY
TO, THE PRIOR AGREEMENTS AND ACTIVITIES.

                  11.18 Releases. (a) At such time as the Revolving Credit
Loans, the Reimbursement Obligations and any other obligations under this
Agreement shall have been paid in full, the Revolving Credit Commitments have
been terminated and no Letters of Credit shall be outstanding, the Collateral
shall be released from the Liens created by the Loan Documents, and all
obligations (other than those expressly stated to survive such termination) of
the Administrative Agent and each Loan Party thereunder and under the other Loan
Documents shall terminate, all without delivery of any instrument or performance
of any act by any party, and all rights to the Collateral shall revert to the
respective Loan Parties. At the request and expense of any Loan Party following
any such termination, the Administrative Agent shall deliver to such Loan Party
any Collateral held by the Administrative Agent under the Security Documents,
and execute and deliver to such Loan Party such documents as such Loan Party
shall reasonably request to evidence such termination.

                  (b) If any of the Collateral shall be sold, transferred or
otherwise disposed of by any Loan Party in a transaction permitted by this
Agreement or such Loan Party is designated as



<PAGE>   87


                                                                             82

an Unrestricted Subsidiary in accordance with the terms of this Agreement, then
the Lenders authorize the Administrative Agent, at the request and expense of
such Loan Party, to execute and deliver to such Loan Party all releases or other
documents reasonably necessary or desirable for the release of the Liens created
by the applicable Security Documents on such Collateral. At the request and sole
expense of the Borrower, the Lenders authorize the Administrative Agent to
release a Loan Party from its obligations under the applicable Security Document
in the event that all the Capital Stock of such Loan Party shall be sold,
transferred or otherwise disposed of in a transaction permitted by this
Agreement or such Loan Party is designated as an Unrestricted Subsidiary in
accordance with the terms of this Agreement, provided that the Borrower shall
have delivered to the Administrative Agent, at least five Business Days prior to
the date of the proposed release, a written request for release identifying the
relevant Loan Party and the terms of the sale or other disposition in reasonable
detail, including the price thereof and any expenses in connection therewith,
together with a certification by the Borrower stating that such transaction is
in compliance with this Agreement and the other Loan Documents.

                  11.19 Co-Borrower's Obligations. The Co-Borrower is a party
hereto for purposes of providing co-extensive obligors for the Obligations (on a
joint and several basis), although the parties acknowledge that the Co-Borrower
shall not have any substantial assets or other property. All references in this
Agreement and the other Loan Documents to the "Borrower" shall be deemed to
include a reference to the Co-Borrower, mutatis mutandis, whether or not actual
reference is made thereto; provided, that, without limiting the generality of
the foregoing, any obligations by any of the parties hereto to the Borrower
shall be deemed fulfilled with respect to the Co-Borrower when fulfilled with
respect to the Borrower.



<PAGE>   88


                                                                             83



                  IN WITNESS WHEREOF, the parties hereto have caused this
Agreement to be duly executed and delivered by their proper and duly authorized
officers as of the day and year first above written.

                                        LEVIATHAN GAS PIPELINE PARTNERS, L.P.


                                        By   /s/  KEITH FORMAN
                                          -------------------------------------
                                          Name:   Keith Forman
                                          Title:  Chief Financial Officer

                                        LEVIATHAN FINANCE CORPORATION


                                        By   /s/  KEITH FORMAN
                                          -------------------------------------
                                          Name:   Keith Forman
                                          Title:  Chief Financial Officer

                                        THE CHASE MANHATTAN BANK, as
                                          Administrative Agent and as a Lender


                                        By   /s/  PETER M. LING
                                          -------------------------------------
                                          Name:   Peter M. Ling
                                          Title:  Vice President


                                        CREDIT LYONNAIS NEW YORK BRANCH,
                                          as Syndication Agent and as a Lender


                                        By   /s/  XAVIER RATOUIS
                                          -------------------------------------
                                          Name:   Xavier Ratouis
                                          Title:  Senior Vice President


                                        BANKBOSTON, N.A.,
                                          as Documentation Agent and as a Lender

                                        By   /s/  CHRISTOPHER HOLMGREN
                                          -------------------------------------
                                          Name:   Christopher Holmgren
                                          Title:  Director






<PAGE>   89

                                                                             84


                                        ARAB BANKING CORPORATION (B.S.C.)


                                        By   /s/  STEPHEN A. PLAUCHE'
                                          -------------------------------------
                                          Name:   Stephen A. Plauche'
                                          Title:  Vice President


                                        THE BANK OF NOVA SCOTIA


                                        By   /s/  F.C.H. ASHBY
                                          --------------------------------------
                                          Name:   F.C.H. Ashby
                                          Title:  Senior Manager Loan Operations


                                        BANK OF SCOTLAND


                                        By   /s/  JANET TAFFE
                                          -------------------------------------
                                          Name:   Janet Taffe
                                          Title:  Assistant Vice President


                                        THE FIRST NATIONAL BANK OF CHICAGO


                                        By   /s/  KENNETH J. FATUR
                                          -------------------------------------
                                          Name:   Kenneth J. Fatur
                                          Title:  Vice President


                                        BANK OF AMERICA NT &SA


                                        By   /s/  PATRICK DELANEY
                                          -------------------------------------
                                          Name:   Patrick Delaney
                                          Title:  Senior Vice President


                                        CREDIT AGRICOLE INDOSUEZ


                                        By   /s/  PATRICK COCQUEREL
                                          -------------------------------------
                                          Name:   Patrick Cocquerel
                                          Title:  First Vice President,
                                                    Managing Director


                                        By   /s/  BRIAN D. KNEZEAK
                                          -------------------------------------
                                          Name:   Brian D. Knezeak
                                          Title:  First Vice President



<PAGE>   90

                                                                             85

                                        CIBC, INC.


                                        By   /s/  ROGER COLDEN
                                          -------------------------------------
                                          Name:   Roger Colden
                                          Title:  Authorized Signatory


                                        CREDIT SUISSE FIRST BOSTON


                                        By   /s/  J. SCOTT KARRO
                                          -------------------------------------
                                          Name:   J. Scott Karro
                                          Title:  Associate


                                        By   /s/  JAMES P. MORAN
                                          -------------------------------------
                                          Name:   James P. Moran
                                          Title:  Director


                                        THE FUJI BANK, LIMITED


                                        By   /s/  KAZUYUKI NISHIMURA
                                          -------------------------------------
                                          Name:   Kazuyuki Nishimura
                                          Title:  Senior Vice President and
                                                    Group Head

                                        HIBERNIA NATIONAL BANK


                                        By   /s/  GARY CULBERTSON
                                          -------------------------------------
                                          Name:   Gary Culbertson
                                          Title:  Assistant Vice President


                                        FIRST UNION NATIONAL BANK


                                        By   /s/  PAUL N. RIDDLE
                                          -------------------------------------
                                          Name:   Paul N. Riddle
                                          Title:  Managing Director


                                        KBC BANK N.V.


                                        By   /s/  ROBERT SNAUFFER
                                          -------------------------------------
                                          Name:   Robert Snauffer
                                          Title:  First Vice President


                                        By   /s/  RAYMOND F. MURRAY
                                          -------------------------------------
                                          Name:   Raymond F. Murray
                                          Title:  First Vice President



<PAGE>   91

                                                                             86

                                        WELLS FARGO BANK (TEXAS), N.A.


                                        By   /s/  CHRISTINA FAITH
                                          -------------------------------------
                                          Name:   Christina Faith
                                          Title:  Assistant Vice President


                                        PNC BANK


                                        By   /s/  THOMAS A. MAJESKI
                                          -------------------------------------
                                          Name:   Thomas A. Majeski
                                          Title:  Vice President


                                        PARIBAS


                                        By   /s/  MARIAN LIVINGSTON
                                          -------------------------------------
                                          Name:   Marian Livingston
                                          Title:  Vice President


                                        MEESPIERSON CAPITAL CORP.



                                        By   /s/  DARRELL W. HOLLEY
                                          -------------------------------------
                                          Name:   Darrell W. Holley
                                          Title:  Senior Vice President


                                        CREDIT LYONNAIS NEW YORK BRANCH


                                        By   /s/  XAVIER RATOUIS
                                          -------------------------------------
                                          Name:   Xavier Ratouis
                                          Title:  Senior Vice President




<PAGE>   1

                                                                    EXHIBIT 23.1

                       CONSENT OF INDEPENDENT ACCOUNTANTS


     We hereby consent to the use in this Registration Statement on Amendment
No. 1 to Form S-4 of Leviathan Gas Pipeline Partners, L.P. and Leviathan Finance
Corporation of (i) our reports dated March 19, 1999 relating to the consolidated
financial statements of Leviathan Gas Pipeline Partners, L.P. and subsidiaries
and the financial statements of Viosca Knoll Gathering Company, (ii) our report
dated March 11, 1999 relating to the consolidated financial statements of
Neptune Pipeline Company, L.L.C., (iii) our report dated May 3, 1999 relating to
the balance sheet of Leviathan Finance Corporation and (iv) our report dated
June 2, 1999 relating to the balance sheet of Leviathan Gas Pipeline Company
each of which appears in such Registration Statement. We also consent to the
reference to us under the heading "Experts" in such Registration Statement.


                                             /s/ PricewaterhouseCoopers LLP

Houston, Texas

August 26, 1999


<PAGE>   1

                                                                    EXHIBIT 23.2


                         INDEPENDENT AUDITORS' CONSENT



     We consent to the use in this Registration Statement of Leviathan Gas
Pipeline Partners, L.P. on Amendment No. 1 to Form S-4 of our report dated
February 19, 1999, appearing in this Registration Statement, relating to the
statements of financial position of High Island Offshore System, L.L.C. as of
December 31, 1998 and 1997 and the related statements of income, members'
equity, and cash flows for each of the three years in the period ended December
31, 1998.


     We also consent to the reference to us under the heading "Experts" in such
Registration Statement.

                                                /s/ DELOITTE & TOUCHE LLP

Detroit, Michigan

August 26, 1999


<PAGE>   1

                                                                    EXHIBIT 23.3

                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


As independent public accountants, we hereby consent to the use of our report
dated March 18, 1999 relating to the financial statements of Poseidon Oil
Pipeline Company, L.L.C., as of December 31, 1998 and 1997 and for the years
ended December 31, 1998 and 1997 and the period from inception (February 14,
1996) through December 31, 1996, included in this Registration Statement on Form
S-4 (No. 333-81143) of Leviathan Gas Pipeline Partners, L.P., and to all
references to our Firm in this Registration Statement.


                                                 /s/ ARTHUR ANDERSEN LLP

Houston, Texas

August 26, 1999


<PAGE>   1

                                                                    EXHIBIT 23.4

           CONSENT OF INDEPENDENT PETROLEUM ENGINEERS AND GEOLOGISTS


     We hereby consent to the use in this Amendment No. 1 to the Registration
Statement on Form S-4 of Leviathan Gas Pipeline Partners, L.P. of our reserve
report as of December 31, 1998, and all references to our firm appearing in this
Registration Statement of Leviathan Gas Pipeline Partners, L.P. for the fiscal
year ended December 31, 1998. We also consent to the reference to us under the
heading of "Experts" in this Registration Statement.


                                        NETHERLAND, SEWELL & ASSOCIATES, INC.

                                        By:      /s/ FREDERIC D. SEWELL
                                           -------------------------------------
                                                    Frederic D. Sewell
                                                         President

Dallas, Texas

August 26, 1999


<PAGE>   1


                                                                    EXHIBIT 99.1


                     LEVIATHAN GAS PIPELINE PARTNERS, L.P.


                         LEVIATHAN FINANCE CORPORATION


                             LETTER OF TRANSMITTAL
                                      FOR
                           TENDER OF ALL OUTSTANDING

              10 3/8% SERIES A SENIOR SUBORDINATED NOTES DUE 2009

                                IN EXCHANGE FOR

              10 3/8% SERIES B SENIOR SUBORDINATED NOTES DUE 2009

                      THAT HAVE BEEN REGISTERED UNDER THE
                             SECURITIES ACT OF 1933

        THE EXCHANGE OFFER WILL EXPIRE AT 5:00 P.M., NEW YORK CITY TIME,

    ON MONDAY, SEPTEMBER 27, 1999, UNLESS EXTENDED (THE "EXPIRATION DATE").


     SERIES A NOTES TENDERED IN THE EXCHANGE OFFER MAY BE WITHDRAWN AT ANY

      TIME PRIOR TO 5:00 P.M., NEW YORK CITY TIME, ON THE EXPIRATION DATE.

                         Deliver to the Exchange Agent:


                           CHASE BANK OF TEXAS, N.A.



<TABLE>
<S>                                            <C>
      By Registered or Certified Mail or
              Overnight Courier:                             By Hand in Dallas:
          Chase Bank of Texas, N.A.                      Chase Bank of Texas, N.A.
          Corporate Trust Operations                     Corporate Trust Operations
                P.O. Box 2320                                 1201 Main Street
           Dallas, Texas 75221-2320                         Dallas, Texas 75202
                1-800-275-2048                                 1-800-275-2048
              Attn: Frank Ivins                              Attn: Frank Ivins
</TABLE>


                           By Facsimile Transmission:
                        (for Eligible Institutions Only)

                                 (214) 672-5746


                             Confirm by Telephone:

                                 (214) 672-5678



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

     DELIVERY OF THIS INSTRUMENT TO AN ADDRESS OTHER THAN AS SET FORTH ABOVE OR
TRANSMISSION OF INSTRUCTIONS VIA A FACSIMILE NUMBER OTHER THAN THE ONE LISTED
ABOVE WILL NOT CONSTITUTE A VALID DELIVERY. THE INSTRUCTIONS ACCOMPANYING THIS
LETTER OF TRANSMITTAL SHOULD BE READ CAREFULLY BEFORE THIS LETTER OF TRANSMITTAL
IS COMPLETED.


     The undersigned hereby acknowledges receipt and review of the prospectus
dated August 27, 1999 of Leviathan Gas Pipeline Partners, L.P., a Delaware
limited partnership, and Leviathan Finance Corporation, a Delaware corporation
(together, "Leviathan"), and this Letter of Transmittal, which together describe
the offer of Leviathan (the "exchange offer") to exchange Leviathan's 10 3/8%
Series B Senior Subordinated Notes due 2009 (the "Series B notes"), which have
been registered under the Securities Act of 1933, as amended


                                        1
<PAGE>   2

(the "Securities Act"), pursuant to a registration statement of which the
prospectus is a part, for a like principal amount of Leviathan's issued and
outstanding 10 3/8% Series A Senior Subordinated Notes due 2009 (the "Series A
notes"). Certain terms used but not defined herein have the respective meanings
given to them in the prospectus.

     Leviathan reserves the right, at any time or from time to time, to extend
the exchange offer at its discretion, in which event the term "expiration date"
shall mean the latest date to which the exchange offer is extended. Leviathan
shall give notice of any extension by giving oral, confirmed in writing, or
written notice to the exchange agent and by making a public announcement by
press release to the Dow Jones News Service prior to 9:00 a.m., New York City
time, on the first business day after the previously scheduled expiration date.
The term "business day" shall mean any day that is not a Saturday, Sunday or day
on which banks are authorized by law to close in the State of New York.

     This Letter of Transmittal is to be used by a holder of Series A notes if
original Series A notes, if available, are to be forwarded herewith or an
agent's message is to be used if delivery of Series A notes is to be made by
book-entry transfer to the account maintained by the exchange agent at The
Depository Trust Company (the "book-entry transfer facility") pursuant to the
procedures set forth in the prospectus under the caption "The Exchange
Offer -- Procedures for Tendering Series A Notes." Holders of Series A notes
whose Series A notes are not immediately available, or who are unable to deliver
their Series A notes and all other documents required by this Letter of
Transmittal to the exchange agent on or prior to the expiration date, or who are
unable to complete the procedure for book-entry transfer on a timely basis, must
tender their Series A notes according to the guaranteed delivery procedures set
forth in the prospectus under the caption "The Exchange Offer -- Procedures for
Tendering Series A Notes -- Guaranteed Delivery." See Instruction 2. Delivery of
documents to the book-entry transfer facility does not constitute delivery to
the exchange agent.

     The term "holder" with respect to the exchange offer means any person in
whose name Series A notes are registered on the books of Leviathan or any other
person who has obtained a properly completed bond power from the registered
holder. The undersigned has completed, executed and delivered this Letter of
Transmittal to indicate the action the undersigned desires to take with respect
to the exchange offer. Holders who wish to tender their Series A notes must
complete this Letter of Transmittal in its entirety.

     PLEASE READ THE ENTIRE LETTER OF TRANSMITTAL AND THE PROSPECTUS CAREFULLY
BEFORE CHECKING ANY BOX BELOW.

     THE INSTRUCTIONS INCLUDED WITH THIS LETTER OF TRANSMITTAL MUST BE FOLLOWED.
QUESTIONS AND REQUESTS FOR ASSISTANCE OR FOR ADDITIONAL COPIES OF THE PROSPECTUS
AND THIS LETTER OF TRANSMITTAL MAY BE DIRECTED TO THE EXCHANGE AGENT.

                                        2
<PAGE>   3

     List below the Series A notes to which this Letter of Transmittal relates.
If the space below is inadequate, list the registered numbers and principal
amounts on a separate signed schedule and affix the list to this Letter of
Transmittal.

<TABLE>
<S>                                              <C>               <C>                    <C>
- -----------------------------------------------------------------------------------------------------------
                                  DESCRIPTION OF SERIES A NOTES TENDERED
- -----------------------------------------------------------------------------------------------------------
NAME(S) AND ADDRESS(ES) OF REGISTERED HOLDER(S)
 EXACTLY AS NAME(S) APPEAR(S) ON SERIES A NOTES
OR BOOK-ENTRY ACCOUNT (PLEASE FILL IN, IF BLANK)                 SERIES A NOTE(S) TENDERED
- -----------------------------------------------------------------------------------------------------------
                                                                    AGGREGATE PRINCIPAL       PRINCIPAL
                                                    REGISTERED       AMOUNT REPRESENTED        AMOUNT
                                                    NUMBER(S)*           BY NOTE(S)          TENDERED**
                                                   ------------------------------------------------------

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

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

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

                                                   ------------------------------------------------------
- -----------------------------------------------------------------------------------------------------------
  * Need not be completed by book-entry holders.
 ** Unless otherwise indicated, any tendering holder of Series A notes will be deemed to have tendered the
    entire aggregate principal amount represented by such Series A notes. All tenders must be in integral
    multiples of $1,000.
- -----------------------------------------------------------------------------------------------------------
</TABLE>

[ ] CHECK HERE IF TENDERED SERIES A NOTES ARE ENCLOSED HEREWITH.

[ ] CHECK HERE IF TENDERED SERIES A NOTES ARE BEING DELIVERED BY BOOK-ENTRY
    TRANSFER MADE TO THE ACCOUNT MAINTAINED BY THE EXCHANGE AGENT WITH THE
    BOOK-ENTRY TRANSFER FACILITY AND COMPLETE THE FOLLOWING (FOR USE BY ELIGIBLE
    INSTITUTIONS ONLY):

Name of Tendering Institution:
- -------------------------------------------------------------------------------

Account Number:
- --------------------------------------------------------------------------------

Transaction Code Number:
- --------------------------------------------------------------------------------

[ ]  CHECK HERE IF TENDERED SERIES A NOTES ARE BEING DELIVERED PURSUANT TO A
     NOTICE OF GUARANTEED DELIVERY PREVIOUSLY SENT TO THE EXCHANGE AGENT AND
     COMPLETE THE FOLLOWING (FOR USE BY ELIGIBLE INSTITUTIONS ONLY):

Name(s) of registered holder(s) of Series A notes:
- ----------------------------------------------------------

Date of execution of Notice of Guaranteed Delivery:
- ---------------------------------------------------------

Window ticket number (if available):
- -------------------------------------------------------------------------

Name of eligible institution that guaranteed delivery:
- ---------------------------------------------------------

Account number (if delivered by book-entry transfer):
- -------------------------------------------------------

[ ] CHECK HERE IF YOU ARE A BROKER-DEALER AND WISH TO RECEIVE 10 ADDITIONAL
    COPIES OF THE PROSPECTUS AND 10 COPIES OF ANY AMENDMENTS OR SUPPLEMENTS
    THERETO:

Name:
- --------------------------------------------------------------------------------

Address:
- --------------------------------------------------------------------------------

                                        3
<PAGE>   4

                       SIGNATURES MUST BE PROVIDED BELOW
              PLEASE READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY

Ladies and Gentlemen:

     Subject to the terms and conditions of the exchange offer, the undersigned
hereby tenders to Leviathan for exchange the principal amount of Series A notes
indicated above. Subject to and effective upon the acceptance for exchange of
the principal amount of Series A notes tendered in accordance with this Letter
of Transmittal, the undersigned hereby exchanges, assigns and transfers to
Leviathan all right, title and interest in and to the Series A notes tendered
for exchange hereby. The undersigned hereby irrevocably constitutes and appoints
the exchange agent, the agent and attorney-in-fact of the undersigned (with full
knowledge that the exchange agent also acts as the agent of Leviathan in
connection with the exchange offer) with respect to the tendered Series A notes
with full power of substitution to:

     - deliver such Series A notes, or transfer ownership of such Series A notes
       on the account books maintained by the book-entry transfer facility, to
       Leviathan and deliver all accompanying evidences of transfer and
       authenticity, and

     - present such Series A notes for transfer on the books of Leviathan and
       receive all benefits and otherwise exercise all rights of beneficial
       ownership of such Series A notes,

all in accordance with the terms of the exchange offer. The power of attorney
granted in this paragraph shall be deemed to be irrevocable and coupled with an
interest.

     The undersigned hereby represents and warrants that the undersigned has
full power and authority to tender, exchange, assign and transfer the Series A
notes tendered hereby and to acquire the Series B notes issuable upon the
exchange of such tendered Series A notes, and that Leviathan will acquire good
and unencumbered title thereto, free and clear of all liens, restrictions,
charges and encumbrances and not subject to any adverse claim, when the same are
accepted for exchange by Leviathan.

     The undersigned acknowledge(s) that this exchange offer is being made in
reliance upon interpretations contained in no-action letters issued to third
parties by the staff of the Securities and Exchange Commission (the "SEC"),
including Exxon Capital Holdings Corporation, SEC No-Action Letter (available
April 13, 1989), Morgan Stanley & Co. Inc., SEC No-Action Letter (available June
5, 1991) (the "Morgan Stanley Letter") and Mary Kay Cosmetics, Inc., SEC
No-Action Letter (available June 5, 1991), that the Series B notes issued in
exchange for the Series A notes pursuant to the exchange offer may be offered
for resale, resold and otherwise transferred by holders thereof (other than a
broker-dealer who purchased Series A notes exchanged for such Series B notes
directly from Leviathan to resell pursuant to Rule 144A or any other available
exemption under the Securities Act), without compliance with the registration
and prospectus delivery provisions of the Securities Act, provided that such
Series B notes are acquired in the ordinary course of such holders' business and
such holders are not participating in, and have no arrangement with any person
to participate in, the distribution of such Series B notes. The undersigned
specifically represent(s) to Leviathan that:

     - any Series B notes acquired in exchange for Series A notes tendered
       hereby are being acquired in the ordinary course of business of the
       person receiving such Series B notes, whether or not the undersigned;

     - the undersigned is not participating in, and has no arrangement with any
       person to participate in, the distribution of Series B notes;

     - neither the undersigned nor any such other person is an "affiliate" (as
       defined in Rule 405 under the Securities Act) of Leviathan or a
       broker-dealer tendering Series A notes acquired directly from Leviathan.

     If the undersigned is not a broker-dealer, the undersigned represents that
it is not engaged in, and does not intend to engage in, a distribution of Series
B notes. If the undersigned is a broker-dealer that will receive Series B notes
for its own account in exchange for Series A notes that were acquired as a
result of market-
                                        4
<PAGE>   5

making activities or other trading activities, it acknowledges that it will
deliver a prospectus in connection with any resale of such Series B notes;
however, by so acknowledging and by delivering a prospectus, the undersigned
will not be deemed to admit that it is an "underwriter" within the meaning of
the Securities Act. The undersigned acknowledges that if the undersigned is
participating in the exchange offer for the purpose of distributing the Series B
notes:

     - the undersigned cannot rely on the position of the staff of the SEC in
       the Morgan Stanley Letter and similar SEC no-action letters, and, in the
       absence of an exemption therefrom, must comply with the registration and
       prospectus delivery requirements of the Securities Act in connection with
       a secondary resale transaction of the Series B notes, in which case the
       registration statement must contain the selling security holder
       information required by Item 507 or Item 508, as applicable, of
       Regulation S-K of the SEC; and

     - a broker-dealer that delivers such a prospectus to purchasers in
       connection with such resales will be subject to certain of the civil
       liability provisions under the Securities Act and will be bound by the
       provisions of the registration agreement (including certain
       indemnification rights and obligations).

     The undersigned will, upon request, execute and deliver any additional
documents deemed by the exchange agent or Leviathan to be necessary or desirable
to complete the exchange, assignment and transfer of the Series A notes tendered
hereby, including the transfer of such Series A notes on the account books
maintained by the book-entry transfer facility.

     For purposes of the exchange offer, Leviathan shall be deemed to have
accepted for exchange validly tendered Series A notes when, as and if Leviathan
gives oral or written notice thereof to the exchange agent. Any tendered Series
A notes that are not accepted for exchange pursuant to the exchange offer for
any reason will be returned, without expense, to the undersigned at the address
shown below or at a different address as may be indicated herein under "Special
Delivery Instructions" as promptly as practicable after the expiration date.

     All authority conferred or agreed to be conferred by this Letter of
Transmittal shall survive the death, incapacity or dissolution of the
undersigned, and every obligation of the undersigned under this Letter of
Transmittal shall be binding upon the undersigned's heirs, personal
representatives, successors and assigns.

     The undersigned acknowledges that the acceptance of properly tendered
Series A notes by Leviathan pursuant to the procedures described under the
caption "The Exchange Offer -- Procedures for Tendering Series A Notes" in the
prospectus and in the instructions hereto will constitute a binding agreement
between the undersigned and Leviathan upon the terms and subject to the
conditions of the exchange offer.

     Unless otherwise indicated under "Special Issuance Instructions," please
issue the Series B notes issued in exchange for the Series A notes accepted for
exchange and return any Series A notes not tendered or not exchanged, in the
name(s) of the undersigned. Similarly, unless otherwise indicated under "Special
Delivery Instructions," please mail or deliver the Series B notes issued in
exchange for the Series A notes accepted for exchange and any Series A notes not
tendered or not exchanged (and accompanying documents, as appropriate) to the
undersigned at the address shown below the undersigned's signature(s). In the
event that both "Special Issuance Instructions" and "Special Delivery
Instructions" are completed, please issue the Series B notes issued in exchange
for the Series A notes accepted for exchange in the name(s) of, and return any
Series A notes not tendered or not exchanged to, the person(s) so indicated. The
undersigned recognizes that Leviathan has no obligation pursuant to the "Special
Issuance Instructions" and "Special Delivery Instructions" to transfer any
Series A notes from the name of the registered holder(s) thereof if Leviathan
does not accept for exchange any of the Series A notes so tendered for exchange.

                                        5
<PAGE>   6

                         SPECIAL ISSUANCE INSTRUCTIONS
                           (SEE INSTRUCTIONS 5 AND 6)

     To be completed ONLY (i) if Series A notes in a principal amount not
tendered, or Series B notes issued in exchange for Series A notes accepted for
exchange, are to be issued in the name of someone other than the undersigned, or
(ii) if Series A notes tendered by book-entry transfer that are not exchanged
are to be returned by credit to an account maintained at the book-entry transfer
facility other than the account indicated above.

Issue Series B notes and/or Series A notes to:

Name:
- --------------------------------------------------------------------------------
                                (Please Print or Type)

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


Address:
- --------------------------------------------------------------------------------


- --------------------------------------------------------------------------------
              (Include Zip Code)

- --------------------------------------------------------------------------------
                 (Tax Identification or Social Security Number)

[ ] Credit unexchanged Series A notes delivered by book-entry transfer to the
    book-entry transfer facility set forth below:

    Book-entry transfer facility account number:

                         (Complete Substitute Form W-9)

                         SPECIAL DELIVERY INSTRUCTIONS
                           (SEE INSTRUCTIONS 5 AND 6)

     To be completed ONLY if Series A notes in a principal amount not tendered,
or Series B notes issued in exchange for Series A notes accepted for exchange,
are to be mailed or delivered to someone other than the undersigned, or to the
undersigned at an address other than that shown below the undersigned's
signature.

Mail or deliver Series B notes and/or Series A notes to:


Name:
- --------------------------------------------------------------------------------
                             (Please Print or Type)

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


Address:
- --------------------------------------------------------------------------------


- --------------------------------------------------------------------------------
                               (Include Zip Code)

- --------------------------------------------------------------------------------
                 (Tax Identification or Social Security Number)

                                        6
<PAGE>   7

                                   IMPORTANT

                 PLEASE SIGN HERE WHETHER OR NOT SERIES A NOTES
                      ARE BEING PHYSICALLY TENDERED HEREBY

          (COMPLETE ACCOMPANYING SUBSTITUTE FORM W-9 ON REVERSE SIDE)

X
- --------------------------------------------------------------------------------

X
- --------------------------------------------------------------------------------
             (Signature(s) of Registered Holder(s) of Series A Notes)

Dated:                                                                      1999
       -------------------------------------------------------------------,


(The above lines must be signed by the registered holder(s) of Series A notes as
name(s) appear(s) on the Series A notes or on a security position listing, or by
person(s) authorized to become registered holder(s) by a properly completed bond
power from the registered holder(s), a copy of which must be transmitted with
this Letter of Transmittal. If Series A notes to which this Letter of
Transmittal relate are held of record by two or more joint holders, then all
such holders must sign this Letter of Transmittal. If signature is by a trustee,
executor, administrator, guardian, attorney-in-fact, officer of a corporation or
other person acting in a fiduciary or representative capacity, then such person
must set forth his or her full title below and, unless waived by Leviathan,
submit evidence satisfactory to Leviathan of such person's authority so to act.
See Instruction 5 regarding the completion of this Letter of Transmittal,
printed below.)

Name(s):
- --------------------------------------------------------------------------------
                                 (Please Type or Print)

Capacity:
- --------------------------------------------------------------------------------

Address:
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
                               (Include Zip Code)

Area Code and Telephone Number:
- --------------------------------------------------------------------------------

                              SIGNATURE GUARANTEE

                         (IF REQUIRED BY INSTRUCTION 5)

Certain signatures must be guaranteed by an eligible institution.

Signature(s) guaranteed by an eligible institution:

- --------------------------------------------------------------------------------
                             (Authorized Signature)

- --------------------------------------------------------------------------------
                                    (Title)

- --------------------------------------------------------------------------------
                                 (Name of Firm)

- --------------------------------------------------------------------------------
                          (Address, Include Zip Code)

- --------------------------------------------------------------------------------
                        (Area Code and Telephone Number)

Dated:                                                                      1999
- ---------------------------------------------------------------------------,


                                        7
<PAGE>   8

                                  INSTRUCTIONS

         FORMING PART OF THE TERMS AND CONDITIONS OF THE EXCHANGE OFFER

     1. Delivery of this Letter of Transmittal and Series A Notes or Book-Entry
Confirmations. All physically delivered Series A notes or any confirmation of a
book-entry transfer to the exchange agent's account at the book-entry transfer
facility of Series A notes tendered by book-entry transfer (a "book-entry
confirmation"), as well as a properly completed and duly executed copy of this
Letter of Transmittal (or facsimile hereof) or agent's message, and any other
documents required by this Letter of Transmittal, must be received by the
exchange agent at its address set forth herein prior to 5:00 p.m., New York City
time, on the expiration date. The method of delivery of the tendered Series A
notes, this Letter of Transmittal and all other required documents to the
exchange agent is at the election and risk of the holder and, except as
otherwise provided below, the delivery will be deemed made only when actually
received or confirmed by the exchange agent. Instead of delivery by mail, it is
recommended that the holder use an overnight or hand delivery service. In all
cases, sufficient time should be allowed to assure delivery to the exchange
agent before the expiration date. No Letter of Transmittal or Series A notes
should be sent to Leviathan.

     2. Guaranteed Delivery Procedures. Holders who wish to tender their Series
A notes and whose Series A notes are not immediately available or who cannot
deliver their Series A notes, this Letter of Transmittal or any other documents
required hereby to the exchange agent prior to the expiration date or who cannot
complete the procedure for book-entry transfer on a timely basis and deliver an
agent's message, must tender their Series A notes according to the guaranteed
delivery procedures set forth in the prospectus. Pursuant to such procedures:

     - such tender must be made by or through a firm that is a member of a
       registered national securities exchange or of the National Association of
       Securities Dealers Inc., a commercial bank or a trust company having an
       office or correspondent in the United States or an "eligible guarantor
       institution" within the meaning of Rule 17Ad-15 under the Exchange Act
       (an "eligible institution");

     - prior to the expiration date, the exchange agent must have received from
       the eligible institution a properly completed and duly executed Notice of
       Guaranteed Delivery (by facsimile transmission, mail or hand delivery)
       setting forth the name and address of the holder of the Series A notes,
       the registration number(s) of such Series A notes and the total principal
       amount of Series A notes tendered, stating that the tender is being made
       thereby and guaranteeing that, within five business days after the
       expiration date, this Letter of Transmittal (or facsimile hereof)
       together with the Series A notes in proper form for transfer (or a
       book-entry confirmation) and any other documents required hereby, must be
       deposited by the eligible institution with the exchange agent within five
       business days after the expiration date; and

     - the certificates for all physically tendered shares of Series A notes, in
       proper form for transfer (or book-entry confirmation, as the case may be)
       and all other documents required hereby are received by the exchange
       agent within five business days after the expiration date.

     Any holder of Series A notes who wishes to tender Series A notes pursuant
to the guaranteed delivery procedures described above must ensure that the
exchange agent receives the Notice of Guaranteed Delivery prior to 5:00 p.m.,
New York City time, on the expiration date. Upon request of the exchange agent,
a Notice of Guaranteed Delivery will be sent to holders who wish to tender their
Series A notes according to the guaranteed delivery procedures set forth above.

     See "The Exchange Offer -- Procedures for Tendering Series A
Notes -- Guaranteed Delivery" section of the prospectus.

     3. Tender by Holder. Only a holder of Series A notes may tender such Series
A notes in the exchange offer. Any beneficial holder of Series A notes who is
not the registered holder and who wishes to tender should arrange with the
registered holder to execute and deliver this Letter of Transmittal on his
behalf or must, prior to completing and executing this Letter of Transmittal and
delivering his Series A notes, either make

                                        8
<PAGE>   9

appropriate arrangements to register ownership of the Series A notes in such
holder's name or obtain a properly completed bond power from the registered
holder.

     4. Partial Tenders. Tenders of Series A notes will be accepted only in
integral multiples of $1,000. If less than the entire principal amount of any
Series A notes is tendered, the tendering holder should fill in the principal
amount tendered in the third column of the box entitled "Description of Series A
Notes Tendered" above. The entire principal amount of Series A notes delivered
to the exchange agent will be deemed to have been tendered unless otherwise
indicated. If the entire principal amount of all Series A notes is not tendered,
then Series A notes for the principal amount of Series A notes not tendered and
Series B notes issued in exchange for any Series A notes accepted will be sent
to the holder at his or her registered address, unless a different address is
provided in the appropriate box on this Letter of Transmittal, promptly after
the Series A notes are accepted for exchange.

     5. Signatures on this Letter of Transmittal; Bond Powers and Endorsements;
Guarantee of Signatures. If this Letter of Transmittal (or facsimile hereof) is
signed by the record holder(s) of the Series A notes tendered hereby, the
signature must correspond with the name(s) as written on the face of the Series
A notes without alteration, enlargement or any change whatsoever. If this Letter
of Transmittal (or facsimile hereof) is signed by a participant in the
book-entry transfer facility, the signature must correspond with the name as it
appears on the security position listing as the holder of the Series A notes.

     If this Letter of Transmittal (or facsimile hereof) is signed by the
registered holder or holders of Series A notes listed and tendered hereby and
the Series B notes issued in exchange therefor are to be issued (or any
untendered principal amount of Series A notes is to be reissued) to the
registered holder, the said holder need not and should not endorse any tendered
Series A notes, nor provide a separate bond power. In any other case, such
holder must either properly endorse the Series A notes tendered or transmit a
properly completed separate bond power with this Letter of Transmittal, with the
signatures on the endorsement or bond power guaranteed by an eligible
institution.

     If this Letter of Transmittal (or facsimile hereof) is signed by a person
other than the registered holder or holders of any Series A notes listed, such
Series A notes must be endorsed or accompanied by appropriate bond powers, in
each case signed as the name of the registered holder or holders appears on the
Series A notes.

     If this Letter of Transmittal (or facsimile hereof) or any Series A notes
or bond powers are signed by trustees, executors, administrators, guardians,
attorneys-in-fact, officers of corporations or others acting in a fiduciary or
representative capacity, such persons should so indicate when signing, and,
unless waived by Leviathan, evidence satisfactory to Leviathan of their
authority to act must be submitted with this Letter of Transmittal.

     Endorsements on Series A notes or signatures on bond powers required by
this Instruction 5 must be guaranteed by an eligible institution.

     No signature guarantee is required if:

     - this Letter of Transmittal (or facsimile hereof) is signed by the
       registered holder(s) of the Series A notes tendered herein (or by a
       participant in the book-entry transfer facility whose name appears on a
       security position listing as the owner of the tendered Series A notes)
       and the Series B notes are to be issued directly to such registered
       holder(s) (or, if signed by a participant in the book-entry transfer
       facility, deposited to such participant's account at such book-entry
       transfer facility) and neither the box entitled "Special Delivery
       Instructions" nor the box entitled "Special Issuance Instructions" has
       been completed; or

     - such Series A notes are tendered for the account of an eligible
       institution.

In all other cases, all signatures on this Letter of Transmittal (or facsimile
hereof) must be guaranteed by an eligible institution.

     6. Special Issuance and Delivery Instructions. Tendering holders should
indicate, in the applicable box or boxes, the name and address (or account at
the book-entry transfer facility) to which Series B notes or
                                        9
<PAGE>   10

substitute Series A notes for principal amounts not tendered or not accepted for
exchange are to be issued or sent, if different from the name and address of the
person signing this Letter of Transmittal. In the case of issuance in a
different name, the taxpayer identification or social security number of the
person named must also be indicated.

     7. Transfer Taxes. Leviathan will pay all transfer taxes, if any,
applicable to the exchange of Series A notes pursuant to the exchange offer. If,
however, Series B notes or Series A notes for principal amounts not tendered or
accepted for exchange are to be delivered to, or are to be registered or issued
in the name of, any person other than the registered holder of the Series A
notes tendered hereby, or if tendered Series A notes are registered in the name
of any person other than the person signing this Letter of Transmittal, or if a
transfer tax is imposed for any reason other than the exchange of Series A notes
pursuant to the exchange offer, then the amount of any such transfer taxes
(whether imposed on the registered holder or any other persons) will be payable
by the tendering holder. If satisfactory evidence of payment of such taxes or
exemption therefrom is not submitted with this Letter of Transmittal, the amount
of such transfer taxes will be billed directly to such tendering holder.

     EXCEPT AS PROVIDED IN THIS INSTRUCTION 7, IT WILL NOT BE NECESSARY FOR
TRANSFER TAX STAMPS TO BE AFFIXED TO THE SERIES A NOTES LISTED IN THIS LETTER OF
TRANSMITTAL.

     8. Tax Identification Number. Federal income tax law requires that a holder
of any Series A notes that are accepted for exchange must provide Leviathan (as
payor) with its correct taxpayer identification number ("TIN"), which, in the
case of a holder who is an individual is his or her social security number. If
Leviathan is not provided with the correct TIN, the holder may be subject to a
$50 penalty imposed by the Internal Revenue Service. (If withholding results in
an over-payment of taxes, a refund may be obtained). Certain holders (including,
among others, all corporations and certain foreign individuals) are not subject
to these backup withholding and reporting requirements. See the enclosed
"Guidelines for Certification of Taxpayer Identification Number on Substitute
Form W-9" for additional instructions.

     To prevent backup withholding, each tendering holder must provide such
holder's correct TIN by completing the Substitute Form W-9 set forth herein,
certifying that the TIN provided is correct (or that such holder is awaiting a
TIN), and that:

     - the holder has not been notified by the Internal Revenue Service that
       such holder is subject to backup withholding as a result of failure to
       report all interest or dividends; or

     - the Internal Revenue Service has notified the holder that such holder is
       no longer subject to backup withholding.

If the Series A notes are registered in more than one name or are not in the
name of the actual owner, see the enclosed "Guidelines for Certification of
Taxpayer Identification Number on Substitute Form W-9" for information on which
TIN to report.

     Leviathan reserves the right in its sole discretion to take whatever steps
are necessary to comply with Leviathan's obligations regarding backup
withholding.

     9. Validity of Tenders. All questions as to the validity, form, eligibility
(including time of receipt), acceptance and withdrawal of tendered Series A
notes will be determined by Leviathan in its sole discretion, which
determination will be final and binding. Leviathan reserves the absolute right
to reject any and all Series A notes not properly tendered or any Series A notes
the acceptance of which would, in the opinion of Leviathan or its counsel, be
unlawful. Leviathan also reserves the absolute right to waive any conditions of
the exchange offer or defects or irregularities in tenders as to particular
Series A notes. The interpretation of the terms and conditions by Leviathan of
the exchange offer (which includes this Letter of Transmittal and the
instructions hereto) shall be final and binding on all parties. Unless waived,
any defects or irregularities in connection with tenders of Series A notes must
be cured within such time as Leviathan shall determine. Neither Leviathan, the
exchange agent nor any other person shall be under any duty to give notification
of defects or irregularities with regard to tenders of Series A notes nor shall
any of them incur any liability for failure to give such notification.
                                       10
<PAGE>   11

     10. Waiver of Conditions. Leviathan reserves the absolute right to waive,
in whole or part, any of the conditions to the exchange offer set forth in the
prospectus.

     11. No Conditional Tender. No alternative, conditional, irregular or
contingent tender of Series A notes or transmittal of this Letter of Transmittal
will be accepted.

     12. Mutilated, Lost, Stolen or Destroyed Series A Notes. Any holder whose
Series A notes have been mutilated, lost, stolen or destroyed should contact the
exchange agent at the address indicated above for further instructions.

     13. Requests for Assistance or Additional Copies. Requests for assistance
or for additional copies of the prospectus or this Letter of Transmittal may be
directed to the exchange agent at the address or telephone number set forth on
the cover page of this Letter of Transmittal. Holders may also contact their
broker, dealer, commercial bank, trust company or other nominee for assistance
concerning the exchange offer.

     14. Withdrawal. Tenders may be withdrawn only pursuant to the withdrawal
rights set forth in the prospectus under the caption "The Exchange
Offer -- Withdrawal of Tenders."

IMPORTANT: THIS LETTER OF TRANSMITTAL OR A MANUALLY SIGNED FACSIMILE HEREOF
(TOGETHER WITH THE SERIES A NOTES DELIVERED BY BOOK-ENTRY TRANSFER OR IN
ORIGINAL HARD COPY FORM) MUST BE RECEIVED BY THE EXCHANGE AGENT, OR THE NOTICE
OF GUARANTEED DELIVERY MUST BE RECEIVED BY THE EXCHANGE AGENT, PRIOR TO THE
EXPIRATION DATE.

                                       11
<PAGE>   12

<TABLE>
<S>                          <C>                                               <C>
                                                                               ------------------------------
 SUBSTITUTE                   PART 1 -- PLEASE PROVIDE YOUR TIN IN THE BOX AT  Social Security Number(s)
 FORM W-9                     THE RIGHT AND CERTIFY BY SIGNING AND DATING
                              BELOW                                            OR
                                                                               ------------------------------
                                                                               Employer Identification Number
                              PART 2 -- Certification -- Under penalties of    PART 3 --
 Department of the Treasury   perjury, I certify that:
 Internal Revenue Service                                                      Awaiting TIN [ ]
                              (1) The number shown on this form is my correct
 PAYER'S REQUEST FOR              Taxpayer Identification Number (or I am      Please complete the Certificate of
 TAXPAYER IDENTIFICATION          waiting for a number to be issued to me)     Awaiting Taxpayer Identification
 NUMBER (TIN)                     and                                          Number below.
                              (2) I am not subject to backup withholding
                              either because I have not been notified by
                                  Internal Revenue Service ("IRS") that I am
                                  subject to backup withholding as a result
                                  of failure to report all interest or
                                  dividends or the IRS has notified me that I
                                  am no longer subject to backup withholding.

                              CERTIFICATION INSTRUCTIONS -- You must cross out item (2) in Part 2 above if you have
                              been notified by the IRS that you are subject to backup withholding because of
                              underreporting interest or dividends on your tax returns. However, if after being
                              notified by the IRS that you were subject to backup withholding you received another
                              notification from the IRS stating that you are no longer subject to backup
                              withholding, do not cross out item (2).
                              SIGNATURE ------------------------------- DATE------------------------- , 1999
                              NAME (Please Print)----------------------------------------------------------------
</TABLE>

NOTE: FAILURE TO COMPLETE AND RETURN THIS FORM MAY RESULT IN BACKUP WITHHOLDING
      OF 31% OF ANY PAYMENTS MADE TO YOU PURSUANT TO THE EXCHANGE OFFER. PLEASE
      REVIEW THE ENCLOSED GUIDELINES FOR CERTIFICATION OF TAXPAYER
      IDENTIFICATION NUMBER ON SUBSTITUTE FORM W-9 FOR ADDITIONAL DETAILS.

           YOU MUST COMPLETE THE FOLLOWING CERTIFICATE IF YOU CHECKED
                 THE BOX IN PART 3 OF THE SUBSTITUTE FORM W-9.

             CERTIFICATE OF AWAITING TAXPAYER IDENTIFICATION NUMBER

     I certify under penalties of perjury that a taxpayer identification number
has not been issued to me, and either (a) I have mailed or delivered an
application to receive a taxpayer identification number to the appropriate
Internal Revenue Service Center or Social Security Administration Office or (b)
I intend to mail or deliver an application in the near future. I understand that
if I do not provide a taxpayer identification number to the payor within 60
days, 31% of all reportable payments made to me thereafter will be withheld
until I provide a number.

<TABLE>
<S>                                                    <C>
- -----------------------------------------------------  --------------------------------------- ,  1999
                      Signature                                              Date

- -----------------------------------------------------
                 Name (Please Print)
</TABLE>

                                       12
<PAGE>   13

                     CERTIFICATE FOR FOREIGN RECORD HOLDERS

     Under penalties of perjury, I certify that I am not a United States citizen
or resident (or I am signing for a foreign corporation, partnership, estate or
trust).

<TABLE>
<S>                                                    <C>
- -----------------------------------------------------  --------------------------------------- ,  1999
                      Signature                                              Date
</TABLE>

                                       13

<PAGE>   1

                     LEVIATHAN GAS PIPELINE PARTNERS, L.P.
                         LEVIATHAN FINANCE CORPORATION

                         NOTICE OF GUARANTEED DELIVERY
                                      FOR
                           TENDER OF ALL OUTSTANDING
              10 3/8% SERIES A SENIOR SUBORDINATED NOTES DUE 2009
                                IN EXCHANGE FOR
              10 3/8% SERIES B SENIOR SUBORDINATED NOTES DUE 2009
                      THAT HAVE BEEN REGISTERED UNDER THE
                             SECURITIES ACT OF 1933


    This form, or one substantially equivalent hereto, must be used by a holder
to accept the exchange offer of Leviathan Gas Pipeline Partners, L.P., a
Delaware limited partnership, and Leviathan Finance Corporation, a Delaware
corporation (together, "Leviathan"), and to tender 10 3/8% Series A Senior
Subordinated Notes due 2009 (the "Series A notes") to the exchange agent
pursuant to the guaranteed delivery procedures described in "The Exchange
Offer -- Procedures for Tendering Series A Notes -- Guaranteed Delivery"
beginning on page 79 of the prospectus of Leviathan, dated August 27, 1999 and
in Instruction 2 to the related Letter of Transmittal. Any holder who wishes to
tender Series A pursuant to such guaranteed delivery procedures must ensure that
the exchange agent receives this Notice of Guaranteed Delivery prior to the
expiration date (as defined below) of the exchange offer. Certain terms used but
not defined herein have the meanings ascribed to them in the prospectus or the
Letter of Transmittal.


        THE EXCHANGE OFFER WILL EXPIRE AT 5:00 P.M., NEW YORK CITY TIME,

    ON MONDAY, SEPTEMBER 27, 1999, UNLESS EXTENDED (THE "EXPIRATION DATE").

   SERIES A NOTES TENDERED IN THE EXCHANGE OFFER MAY BE WITHDRAWN AT ANY TIME
        PRIOR TO 5:00 P.M., NEW YORK CITY TIME, ON THE EXPIRATION DATE.

                 The Exchange Agent for the Exchange Offer is:

                           CHASE BANK OF TEXAS, N.A.

<TABLE>
<S>                                            <C>
      By Registered or Certified Mail or
              Overnight Courier:                             By Hand in Dallas:
          Chase Bank of Texas, N.A.                      Chase Bank of Texas, N.A.
          Corporate Trust Operations                     Corporate Trust Operations
                P.O. Box 2320                                 1201 Main Street
           Dallas, Texas 75221-2320                         Dallas, Texas 75202
                1-800-275-2048                                 1-800-275-2048
              Attn: Frank Ivins                              Attn: Frank Ivins
</TABLE>

                           By Facsimile Transmission:
                        (for Eligible Institutions Only)
                                 (214) 672-5746

                             Confirm by Telephone:
                                 (214) 672-5678
                             ---------------------

    DELIVERY OF THIS NOTICE OF GUARANTEED DELIVERY TO AN ADDRESS OTHER THAN AS
SET FORTH ABOVE, OR TRANSMISSION OF INSTRUCTIONS VIA FACSIMILE OTHER THAN AS SET
FORTH ABOVE, WILL NOT CONSTITUTE A VALID DELIVERY.

    THIS NOTICE OF GUARANTEED DELIVERY IS NOT TO BE USED TO GUARANTEE
SIGNATURES. IF A SIGNATURE ON A LETTER OF TRANSMITTAL IS REQUIRED TO BE
GUARANTEED BY AN "ELIGIBLE INSTITUTION" UNDER THE INSTRUCTIONS THERETO, SUCH
SIGNATURE GUARANTEE MUST APPEAR IN THE APPLICABLE SPACE IN THE BOX PROVIDED ON
THE LETTER OF TRANSMITTAL FOR GUARANTEE OF SIGNATURES.

                                        1
<PAGE>   2

Ladies and Gentlemen:

     The undersigned hereby tenders to Leviathan, upon the terms and subject to
the conditions set forth in the prospectus and the related Letter of
Transmittal, receipt of which is hereby acknowledged, the principal amount of
Series A notes set forth below pursuant to the guaranteed delivery procedures
set forth in the prospectus and in Instruction 2 of the Letter of Transmittal.

     The undersigned hereby tenders the Series A notes listed below:

<TABLE>
<CAPTION>
<S>                                                     <C>                          <C>
CERTIFICATE NUMBER(S) (IF KNOWN) OF SERIES A NOTES OR   AGGREGATE PRINCIPAL AMOUNT   AGGREGATE PRINCIPAL AMOUNT
      ACCOUNT NUMBER AT THE BOOK-ENTRY FACILITY                REPRESENTED                    TENDERED
- -----------------------------------------------------   --------------------------   --------------------------
</TABLE>
                            PLEASE SIGN AND COMPLETE

Names of Record Holder(s): ----------------------------------------------------

Address(es): ------------------------------------------------------------------

Area Code and Telephone
Number(s): --------------------------------------------------------------------

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

Signature(s): -----------------------------------------------------------------

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

Dated: ------------------------------------------------------------------------,
1999

     This Notice of Guaranteed Delivery must be signed by the holder(s) exactly
as their name(s) appear on certificates for Series A notes or on a security
position listing as the owner of Series A notes, or by person(s) authorized to
become holder(s) by endorsements and documents transmitted with this Notice of
Guaranteed Delivery. If signature is by a trustee, executor, administrator,
guardian, attorney-in-fact, officer or other person acting in a fiduciary or
representative capacity, such person must provide the following information.

                      PLEASE PRINT NAME(S) AND ADDRESS(ES)

Name(s): ----------------------------------------------------------------------

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

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

Capacity: ---------------------------------------------------------------------

Address(es): ------------------------------------------------------------------

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

                                        2
<PAGE>   3

                                   GUARANTEE
                    (NOT TO BE USED FOR SIGNATURE GUARANTEE)


     The undersigned, a firm which is a member of a registered national
securities exchange or of the National Association of Securities Dealers, Inc.,
or is a commercial bank or trust company having an office or correspondent in
the United States, or is otherwise an "eligible guarantor institution" within
the meaning of Rule 17 Ad-15 under the Securities Exchange Act of 1934,
guarantees deposit with the exchange agent of the Letter of Transmittal (or
facsimile thereof), together with the Series A notes tendered hereby in proper
form for transfer (or confirmation of the book-entry transfer of such Series A
notes into the exchange agent's account at the book-entry transfer facility
described in the prospectus under the caption "The Exchange Offer -- Procedures
for Tendering Series A Notes -- Book-Entry Transfer" and in the Letter of
Transmittal) and any other required documents, all by 5:00 p.m., New York City
time, within five business days following the Expiration Date.


Name of Firm:
- --------------------------------------------------------------------------------

Address:
- --------------------------------------------------------------------------------
                                                              (INCLUDE ZIP CODE)

Area Code and Telephone Number:

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


- --------------------------------------------------------------------------------
                             (AUTHORIZED SIGNATURE)

Name:
- --------------------------------------------------------------------------------

Title:
- --------------------------------------------------------------------------------
                             (PLEASE TYPE OR PRINT)

Date:                                                                     , 1999
- --------------------------------------------------------------------------

     DO NOT SEND SERIES A NOTES WITH THIS FORM. ACTUAL SURRENDER OF SERIES A
NOTES MUST BE MADE PURSUANT TO, AND BE ACCOMPANIED BY, A PROPERLY COMPLETED AND
DULY EXECUTED LETTER OF TRANSMITTAL AND ANY OTHER REQUIRED DOCUMENTS.

                                        3
<PAGE>   4

                 INSTRUCTIONS FOR NOTICE OF GUARANTEED DELIVERY


     1. Delivery of this Notice of Guaranteed Delivery. A properly completed and
duly executed copy of this Notice of Guaranteed Delivery and any other documents
required by this Notice of Guaranteed Delivery must be received by the exchange
agent at its address set forth herein prior to the Expiration Date. The method
of delivery of this Notice of Guaranteed Delivery and any other required
documents to the exchange agent is at the election and sole risk of the holder,
and the delivery will be deemed made only when actually received by the exchange
agent. If delivery is by mail, registered mail with return receipt requested,
properly insured, is recommended. As an alternative to delivery by mail, the
holders may wish to consider using an overnight or hand delivery service. In all
cases, sufficient time should be allowed to assure timely delivery. For a
description of the guaranteed delivery procedures, see Instruction 2 of the
Letter of Transmittal.


     2. Signatures on this Notice of Guaranteed Delivery. If this Notice of
Guaranteed Delivery is signed by the registered holder(s) of the Series A notes
referred to herein, the signature must correspond with the name(s) written on
the face of the Series A notes without alteration, enlargement, or any change
whatsoever. If this Notice of Guaranteed Delivery is signed by a participant of
the book-entry transfer facility whose name appears on a security position
listing as the owner of the Series A notes, the signature must correspond with
the name shown on the security position listing as the owner of the Series A
notes.

     If this Notice of Guaranteed Delivery is signed by a person other than the
registered holder(s) of any Series A notes listed or a participant of the
book-entry transfer facility, this Notice of Guaranteed Delivery must be
accompanied by appropriate bond powers, signed as the name of the registered
holder(s) appears on the Series A notes or signed as the name of the participant
shown on the book-entry transfer facility's security position listing.

     If this Notice of Guaranteed Delivery is signed by a trustee, executor,
administrator, guardian, attorney-in-fact, officer of a corporation, or other
person acting in a fiduciary or representative capacity, such person should so
indicate when signing and submit with the Letter of Transmittal evidence
satisfactory to the Leviathan of such person's authority to so act.

     3. Requests for Assistance or Additional Copies. Questions and requests for
assistance and requests for additional copies of the prospectus may be directed
to the exchange agent at the address specified in the prospectus. Holders may
also contact their broker, dealer, commercial bank, trust company, or other
nominee for assistance concerning the exchange offer.

                                        4

<PAGE>   1

                                                                    EXHIBIT 99.3

                     LEVIATHAN GAS PIPELINE PARTNERS, L.P.
                         LEVIATHAN FINANCE CORPORATION
                            EL PASO ENERGY BUILDING
                           1001 LOUISIANA, 26TH FLOOR
                              HOUSTON, TEXAS 77002
                                 (713) 420-2131


                                                                 August 27, 1999


To the Holders of Leviathan Gas Pipeline Partners'

10 3/8% Series A Senior Subordinated Notes due 2009:



     Leviathan Gas Pipeline Partners, L.P., a Delaware limited partnership, and
Leviathan Finance Corporation, a Delaware corporation (together, "Leviathan"),
is offering to exchange its 10 3/8% Series B Senior Subordinated Notes due 2009
that have been registered under the Securities Act of 1933 (the "Series B
notes") for all outstanding 10 3/8% Series A Senior Subordinated Notes due 2009
(the "Series A notes"), upon the terms and subject to the conditions set forth
in the enclosed prospectus dated August 27, 1999 (the "Prospectus") and the
related letter of transmittal (the "Letter of Transmittal" and, together with
the Prospectus, the "Exchange Offer"). The Exchange Offer is conditioned upon a
number of factors set out in the Prospectus under "The Exchange
Offer -- Conditions of the Exchange Offer" beginning on page 81.


     The Series A notes were issued on May 27, 1999 in an original aggregate
principal amount of $175 million, the full principal amount of which remains
outstanding. The maximum amount of Series B notes that will be issued in
exchange for Series A notes is $175 million.

     Please read carefully the Prospectus and the other enclosed materials
relating to the Exchange Offer. If you require assistance, you should consult
your financial, tax or other professional advisors. Holders who wish to
participate in the Exchange Offer are asked to respond promptly by completing
and returning the enclosed Letter of Transmittal, and all other required
documentation, to Chase Bank of Texas, National Association, the exchange agent
(the "Exchange Agent"), for the Exchange Offer.

     If you have questions regarding the terms of the Exchange Offer, please
direct your questions to Chase Bank of Texas, N.A. at 1-800-275-2048.

     Thank you for your time and effort in reviewing this request.

                                        Very truly yours,

                                        LEVIATHAN GAS PIPELINE PARTNERS, L.P.
                                        LEVIATHAN FINANCE CORPORATION

<PAGE>   1

                                                                    EXHIBIT 99.4

                     LEVIATHAN GAS PIPELINE PARTNERS, L.P.
                         LEVIATHAN FINANCE CORPORATION

                               LETTER TO CLIENTS
                                      FOR
                           TENDER OF ALL OUTSTANDING
              10 3/8% SERIES A SENIOR SUBORDINATED NOTES DUE 2009
                                IN EXCHANGE FOR
              10 3/8% SERIES B SENIOR SUBORDINATED NOTES DUE 2009
           THAT HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933

             THE EXCHANGE OFFER WILL EXPIRE AT 5:00 P.M., NEW YORK

           CITY TIME, ON MONDAY, SEPTEMBER 27, 1999, UNLESS EXTENDED

                            (THE "EXPIRATION DATE").
                  NOTES TENDERED IN THE EXCHANGE OFFER MAY BE
               WITHDRAWN AT ANY TIME PRIOR TO 5:00 P.M., NEW YORK
                       CITY TIME, ON THE EXPIRATION DATE.

To Our Clients:


     We are enclosing a prospectus, dated August 27, 1999, of Leviathan Gas
Pipeline Partners, L.P., a Delaware limited partnership, and Leviathan Finance
Corporation, a Delaware corporation (together, "Leviathan"), and a related
Letter of Transmittal (which together constitute the "exchange offer") relating
to the offer by Leviathan to exchange its 10 3/8% Series B Senior Subordinated
Notes due 2009 (the "Series B notes"), which have been registered under the
Securities Act of 1933, as amended, for a like principal amount of Leviathan's
issued and outstanding 10 3/8% Series A Senior Subordinated Notes due 2009 (the
"Series A notes"), upon the terms and subject to the conditions set forth in the
exchange offer.


     The exchange offer is not conditioned upon any minimum number of Series A
notes being tendered.

     We are the holder of record of Series A notes held by us for your account.
A tender of such Series A notes can be made only by us as the record holder and
pursuant to your instructions. The Letter of Transmittal is furnished to you for
your information only and cannot be used by you to tender Series A notes held by
us for your account.

     We request instructions as to whether you wish to tender any or all of the
Series A notes held by us for your account pursuant to the terms and conditions
of the exchange offer. We also request that you confirm that we may on your
behalf make the representations and warranties contained in the Letter of
Transmittal.

                                          Very truly yours,

                                          LEVIATHAN GAS PIPELINE PARTNERS, L.P.
                                          LEVIATHAN FINANCE CORPORATION

                                        1
<PAGE>   2

     PLEASE RETURN YOUR INSTRUCTIONS TO US IN THE ENCLOSED ENVELOPE WITHIN AMPLE
TIME TO PERMIT US TO SUBMIT A TENDER ON YOUR BEHALF PRIOR TO THE EXPIRATION
DATE.

                 INSTRUCTIONS TO REGISTERED HOLDER AND/OR BOOK
                           ENTRY TRANSFER PARTICIPANT

To Registered Holder and/or Participant of the Book-Entry Transfer Facility:


     The undersigned hereby acknowledges receipt of the prospectus dated August
27, 1999 of Leviathan Gas Pipeline Partners, L.P., a Delaware limited
partnership, and Leviathan Finance Corporation, a Delaware corporation
(together, "Leviathan"), and the accompanying Letter of Transmittal, that
together constitute the offer of Leviathan (the "exchange offer") to exchange
Leviathan's 10 3/8% Series B Senior Subordinated Notes due 2009 (the "Series B
notes"), which have been registered under the Securities Act of 1933, as amended
(the "Securities Act"), for all of Leviathan's issued and outstanding 10 3/8%
Series A Senior Subordinated Notes due 2009 (the "Series A notes"). Certain
terms used but not defined herein have the meanings ascribed to them in the
prospectus.


     This will instruct you, the registered holder and/or book-entry transfer
facility participant, as to the action to be taken by you relating to the
exchange offer with respect to the Series A notes held by you for the account of
the undersigned.

     The aggregate face amount of the Series A notes held by you for the account
of the undersigned is (fill in amount):

          $--------------- of the 10 3/8% Series A Senior Subordinated Notes due
     2009.

     With respect to the exchange offer, the undersigned hereby instructs you
(check appropriate box):

        [ ]  To tender the following Series A notes held by you for the account
             of the undersigned (insert principal amount of Series A notes to be
             tendered) (if any): $--------------- .

        [ ]  not to tender any Series A notes held by you for the account of the
             undersigned.

     If the undersigned instructs you to tender the Series A notes held by you
for the account of the undersigned, it is understood that you are authorized to
make, on behalf of the undersigned (and the undersigned by its signature below,
hereby makes to you), the representations and warranties contained in the Letter
of Transmittal that are to be made with respect to the undersigned as a
beneficial owner, including but not limited to the representations, that:

     - the Series B notes acquired in exchange for Series A notes pursuant to
       the exchange offer are being acquired in the ordinary course of business
       of the person receiving such Series B notes, whether or not the
       undersigned;

     - the undersigned is not participating in, and has no arrangement with any
       person to participate in, the distribution of Series B notes within the
       meaning of the Securities Act; and

     - neither the undersigned nor any such other person is an "affiliate"
       (within the meaning of Rule 405 under the Securities Act) of Leviathan or
       a broker-dealer tendering Series A notes acquired directly from
       Leviathan.

                                        2
<PAGE>   3

     If the undersigned is a broker-dealer that will receive Series B notes for
its own account in exchange for Series A notes, it acknowledges that it will
deliver a prospectus in connection with any resale of such Series B notes.

                                   SIGN HERE

Name of beneficial owner(s): ---------------------------------------------------

Signature(s): ------------------------------------------------------------------

Name(s): -----------------------------------------------------------------------
                                 (please print)

Address: -----------------------------------------------------------------------

Telephone Number: --------------------------------------------------------------

Taxpayer Identification or Social Security Number: -----------------------------

Date: --------------------------------------------------------------------------

                                        3

<PAGE>   1

                                                                    EXHIBIT 99.5

                     LEVIATHAN GAS PIPELINE PARTNERS, L.P.
                         LEVIATHAN FINANCE CORPORATION
                        LETTER TO REGISTERED HOLDERS AND
                   DEPOSITORY TRUST COMPANY PARTICIPANTS FOR
                           TENDER OF ALL OUTSTANDING
              10 3/8% SERIES A SENIOR SUBORDINATED NOTES DUE 2009
                                IN EXCHANGE FOR
              10 3/8% SERIES B SENIOR SUBORDINATED NOTES DUE 2009
           THAT HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933

        THE EXCHANGE OFFER WILL EXPIRE AT 5:00 P.M., NEW YORK CITY TIME,

    ON MONDAY, SEPTEMBER 27, 1999, UNLESS EXTENDED (THE "EXPIRATION DATE").


         SERIES A NOTES TENDERED IN THE EXCHANGE OFFER MAY BE WITHDRAWN
                    AT ANY TIME PRIOR TO 5:00 P.M., NEW YORK
                       CITY TIME, ON THE EXPIRATION DATE.

To Registered Holders and Depository Trust Company Participants:


     We are enclosing herewith the material listed below relating to the offer
by Leviathan Gas Pipeline Partners, L.P., a Delaware limited partnership, and
Leviathan Finance Corporation, a Delaware corporation (together, "Leviathan"),
to exchange its 10 3/8% Series B Senior Subordinated Notes due 2009 (the "Series
B notes"), which have been registered under the Securities Act of 1933, as
amended (the "Securities Act"), for a like principal amount of Leviathan's
issued and outstanding 10 3/8% Series A Senior Subordinated Notes due 2009 (the
"Series A notes") upon the terms and subject to the conditions set forth in the
prospectus, dated August 27, 1999, and the related Letter of Transmittal (which
together constitute the "exchange offer").


     Enclosed herewith are copies of the following documents:


          1. Prospectus dated August 27, 1999;


          2. Letter of Transmittal (together with accompanying Substitute Form
     W-9 Guidelines);

          3. Notice of Guaranteed Delivery;

          4. Letter that may be sent to your clients for whose account you hold
     Series A notes in your name or in the name of your nominee;

          5. Letter that may be sent from your clients to you with such client's
     instruction with regard to the exchange offer (included in item 4. above);
     and

          6. Letter to the holders of Series A notes.

     We urge you to contact your clients promptly. Please note that the exchange
offer will expire on the Expiration Date unless extended. The exchange offer is
not conditioned upon any minimum number of Series A notes being tendered.

                                        1
<PAGE>   2

     Pursuant to the Letter of Transmittal, each holder of Series A notes will
represent to Leviathan that:

     - the Series B notes acquired in exchange for Series A notes pursuant to
       the exchange offer are being acquired in the ordinary course of business
       of the person receiving such Series B notes, whether or not the holder;

     - the holder is not participating in, and has no arrangement with any
       person to participate in, the distribution of Series B notes within the
       meaning of the Securities Act; and

     - neither the holder nor any such other person is an "affiliate" (within
       the meaning of Rule 405 under the Securities Act) of Leviathan or a
       broker-dealer tendering Series A notes acquired directly from Leviathan.

If the holder is a broker-dealer that will receive Series B notes for its own
account in exchange for Series A notes, it acknowledges that it will deliver a
prospectus in connection with any resale of such Series B notes.

     The enclosed Letter to Clients contains an authorization by the beneficial
owners of the Series A notes for you to make the foregoing representations.

     Leviathan will not pay any fee or commission to any broker or dealer or to
any other persons (other than the exchange agent) in connection with the
solicitation of tenders of Series A notes pursuant to the exchange offer.
Leviathan will pay or cause to be paid any transfer taxes payable on the
transfer of Series A notes to it, except as otherwise provided in Instruction 7
of the enclosed Letter of Transmittal.

     Additional copies of the enclosed materials may be obtained from the
exchange agent by calling Chase Bank of Texas, N.A. at 1-800-275-2048.

                                          Very truly yours,

                                          LEVIATHAN GAS PIPELINE PARTNERS, L.P.
                                          LEVIATHAN FINANCE CORPORATION

                                        2


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