ATLANTIC RICHFIELD CO /DE
10-Q, 2000-05-11
PETROLEUM REFINING
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<PAGE>

================================================================================


                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

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

                                    FORM 10-Q

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



                QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(D)

                     OF THE SECURITIES EXCHANGE ACT OF 1934

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


                  FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2000

                          COMMISSION FILE NUMBER 1-1196

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

                           ATLANTIC RICHFIELD COMPANY
             (Exact name of registrant as specified in its charter)

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

                  DELAWARE                                       23-0371610
       (State or other jurisdiction of                        (I.R.S. Employer
       incorporation or organization)                        Identification No.)

333 SOUTH HOPE STREET LOS ANGELES, CALIFORNIA                       90071
  (Address of principal executive offices)                        (Zip code)

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

                                 (213) 486-3511
              (Registrant's telephone number, including area code)

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


                                 NOT APPLICABLE

              (Former name, former address and former fiscal year,
                         if changed since last report)

     Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.

                                                         Yes |X| No [ ]

Number of shares of Common Stock, outstanding as of April 18, 2000: 324,711,290.
All of these shares are indirectly owned by BP Amoco p.l.c., and are no longer
listed on the New York Stock Exchange, or any other stock exchange. The only
equity securities currently listed on the New York and Pacific Stock Exchanges,
as of April 18, 2000, are 462,425 shares of $2.80 Preference Shares and 38,668
shares of $3.00 Preference Shares.

================================================================================
<PAGE>

                          PART I. FINANCIAL INFORMATION

            ATLANTIC RICHFIELD COMPANY AND CONSOLIDATED SUBSIDIARIES
                  CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)


                        CONSOLIDATED STATEMENT OF INCOME
<TABLE>
<CAPTION>

                                                                                          THREE MONTHS ENDED
                                                                                               MARCH 31,
                                                                                    --------------------------------
                                                                                          2000             1999
                                                                                    ---------------  ---------------
<S>                                                                                 <C>              <C>
(MILLIONS EXCEPT PER SHARE AMOUNTS)

REVENUES
     Sales and other operating revenues..........................................   $        3,993   $        2,415
     Other revenues..............................................................              201              136
                                                                                    ---------------  ---------------
                                                                                             4,194            2,551
                                                                                    ---------------  ---------------
EXPENSES
     Trade purchases.............................................................            1,685              800
     Operating expenses..........................................................              600              566
     Selling, general and administrative expenses................................              136              152
     Depreciation, depletion and amortization....................................              484              483
     Exploration expenses (including undeveloped leasehold amortization).........              100               74
     Taxes other than income taxes...............................................              177              120
     Interest....................................................................              110               95
                                                                                    ---------------  ---------------
                                                                                             3,292            2,290
                                                                                    ---------------  ---------------
  Income before income taxes and minority interest...............................              902              261
  Provision for taxes on income..................................................              271               93
  Minority interest in earnings of subsidiaries..................................               14                3
                                                                                    ---------------  ---------------
NET INCOME.......................................................................   $          617   $          165
                                                                                    ===============  ===============
EARNED PER SHARE
     BASIC.......................................................................   $         1.91   $         0.51
                                                                                    ===============  ===============
     DILUTED.....................................................................   $         1.87   $         0.51
                                                                                    ===============  ===============
CASH DIVIDENDS PAID PER SHARE OF COMMON STOCK....................................   $        .7125   $        .7125
                                                                                    ===============  ===============
</TABLE>


        THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE STATEMENTS.

                                       1
<PAGE>


                           ATLANTIC RICHFIELD COMPANY
                           CONSOLIDATED BALANCE SHEET

                                                      MARCH 31,    DECEMBER 31,

                                                         2000          1999
                                                      -----------  -------------
(MILLIONS)

ASSETS
Current assets:

   Cash and cash equivalents........................  $    1,007   $         879
   Short-term investments...........................         253             264
   Accounts receivable..............................       1,406           1,301
   Inventories......................................         385             430
   Prepaid expenses and other current assets........         199             184
                                                      -----------  -------------
   Total current assets.............................       3,250           3,058
                                                      -----------  -------------
Investments and long-term receivables:
   Investments accounted for on the equity method...       1,579           1,508
   Other investments and long-term receivables......       1,883           1,660
                                                      -----------  -------------
                                                           3,462           3,168
                                                      -----------  -------------
Net property, plant and equipment...................      18,173          18,466

Net assets of discontinued operations...............          68              67
Deferred charges and other assets...................       1,578           1,513
                                                      -----------  -------------
Total assets........................................  $   26,531   $      26,272
                                                      ===========  =============


        THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE STATEMENTS.

                                       2
<PAGE>
                           ATLANTIC RICHFIELD COMPANY
                           CONSOLIDATED BALANCE SHEET

                                                      MARCH 31,  DECEMBER 31,
                                                        2000        1999

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

(MILLIONS)

LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Notes payable...................................... $ 1,488    $   1,672
  Accounts payable...................................     883          830
  Taxes payable......................................     578          420
  Long-term debt due within one year.................      11           11
  Other..............................................     903        1,090
                                                      --------   ----------

  Total current liabilities..........................   3,863        4,023
                                                      --------   ----------

Long-term debt.......................................   5,599        5,698
Deferred income taxes................................   3,643        3,644
Dismantlement, restoration and reclamation...........   1,174        1,154
Other deferred liabilities and credits...............   2,711        2,770
Minority interest....................................     309          297
                                                      --------   ----------

  Total liabilities..................................  17,299       17,586
                                                      --------   ----------
Stockholders' equity

  Preference stocks..................................       1            1
  Common stock.......................................     818          817
  Capital in excess of par value of stock............     918          889
  Retained earnings..................................   7,476        7,091
  Treasury stock.....................................    (272)        (279)
  Accumulated other comprehensive income.............     291          167
                                                      --------   ----------

  Total stockholders' equity.........................   9,232        8,686
                                                      --------   ----------


Total liabilities and stockholders' equity........... $26,531    $  26,272
                                                      ========   ==========


        THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE STATEMENTS.


                                       3
<PAGE>
                           ATLANTIC RICHFIELD COMPANY
                      CONSOLIDATED STATEMENT OF CASH FLOWS

<TABLE>
<CAPTION>
                                                                   THREE MONTHS ENDED
                                                                       MARCH 31,
                                                                 --------------------
                                                                    2000        1999
                                                                 ---------  ---------
<S>                                                               <C>       <C>
(MILLIONS)

CASH FLOWS FROM OPERATING ACTIVITIES:

Net income..................................................      $   617   $   165
Adjustments to reconcile net income to net cash
provided by operating activities:
  Depreciation, depletion and amortization..................          484       483
  Dry hole expense and undeveloped leasehold amortization...           53        21
  Net gain on asset sales...................................          (71)      (14)
  Income from equity investments............................          (26)       (7)
  Dividends from equity investments.........................           24        20
  Minority interest in earnings of subsidiaries.............           14         3
  Cash payments greater than noncash provisions.............          (86)     (125)
  Deferred income taxes.....................................          (47)       (5)
  Changes in working capital accounts.......................          (72)     (296)
  Other.....................................................          (34)      (43)
                                                                  --------  --------
       Net cash provided by operating activities............          856       202
                                                                  --------  --------

CASH FLOWS FROM INVESTING ACTIVITIES:

  Additions to fixed assets (including dry hole costs)......         (619)     (760)
  Net cash provided by short-term investments...............            7         5
  Proceeds from asset sales.................................          446       577
  Investments and long-term receivables.....................          (75)       (2)
  Other.....................................................          (38)       27
                                                                  --------  --------
       Net cash used by investing activities................         (279)     (153
                                                                  --------  --------

CASH FLOWS FROM FINANCING ACTIVITIES:

  Repayments of long-term debt..............................          (35)     (549)
  Proceeds from issuance of long-term debt..................           --       634
  Net cash provided (used) by notes payable.................         (186)      202
  Dividends paid............................................         (232)     (229)
  Other.....................................................           16        13
                                                                 --------  ---------

       Net cash provided (used) by financing activities.....         (437)       71
                                                                  --------  --------

  Cash flows from discontinued operations...................           (8)       21

  Effect of exchange rate changes on cash...................           (4)       (8)
                                                                  --------  --------

  Net increase in cash and cash equivalents.................          128       133

  Cash and cash equivalents at beginning of period..........          879       657
                                                                  --------  --------
  Cash and cash equivalents at end of period................      $ 1,007   $   790
                                                                  ========  ========
</TABLE>

        THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE STATEMENTS.

                                       4
<PAGE>

          NOTES TO CONSOLIDATED FINANCIAL STATEMENTS-UNAUDITED

NOTE A.  ACCOUNTING POLICIES.

Basis of Presentation.

     The accompanying unaudited consolidated financial statements have been
prepared in accordance with accounting principles generally accepted in the
United States for interim financial information and with the instructions to
Form 10-Q and Article 10 of Regulation S-X. Certain previously reported amounts
have been restated to conform to classifications adopted in 2000. Unless
otherwise stated, the Notes to Consolidated Financial Statements exclude
discontinued operations. In the opinion of the Company, the consolidated
financial statements reflect all adjustments, consisting of normal recurring
accruals, necessary for a fair presentation.

     For further information, refer to the consolidated financial statements and
footnotes thereto included in the annual report on Form 10-K for the year ended
December 31, 1999.

NOTE B.  COMPREHENSIVE INCOME.

     Comprehensive income comprises net income plus all other changes in equity
from nonowner sources. ARCO's comprehensive income for the three-month periods
ended March 31, 2000 and 1999 was as follows:

<TABLE>
<CAPTION>
                                                                 THREE MONTHS
                                                                     ENDED

                                                                   MARCH 31,
                                                                --------------
 (MILLIONS)                                                      2000   1999
                                                                ------- ------
<S>                                                             <C>     <C>

Net income...................................................   $ 617   $ 165
Other comprehensive income:
     Net unrealized gain on investments (a)..................     129     111
Foreign currency translation adjustment......................      (5)    193
                                                                 ----    ----
Comprehensive income.........................................   $ 741   $ 469
                                                                =====   =====
</TABLE>
- --------------
     (a) Primarily consists of changes in the fair value of ARCO's investment in
LUKOIL, which had a fair value of approximately $928 million at March 31, 2000,
compared to a fair value of approximately $714 million at December 31, 1999. The
unrealized pretax gain in the LUKOIL investment at March 31, 2000, was $586
million.

     Accumulated nonowner changes in equity (accumulated other comprehensive
income) at March 31, 2000 and December 31, 1999 were as follows:

<TABLE>
<CAPTION>
                                                            MARCH 31   DECEMBER 31
(MILLIONS)                                                    2000        1999
                                                            --------   -----------
<S>                                                         <C>         <C>
Net unrealized gain on investments.......................   $  357      $   228
Foreign currency translation adjustment..................      (35)         (30)
Minimum pension liability................................      (31)         (31)
                                                            --------   -----------
Accumulated other comprehensive income...................    $ 291      $   167
                                                            ========   ===========
</TABLE>


                                       5
<PAGE>

        NOTES TO CONSOLIDATED FINANCIAL STATEMENTS-UNAUDITED--(CONTINUED)

NOTE C.  INTERIM SEGMENT INFORMATION.

<TABLE>
<CAPTION>
(MILLIONS)
 ---------
                              EXPLORATION  REFINING
                              &            &         ALL
MARCH 31, 2000                PRODUCTION   MARKETING OTHER UNALLOCATED TOTAL
- --------------                ---------    --------  ----  ---------   -------
<S>                           <C>          <C>       <C>   <C>         <C>
Sales and other
   operating revenues........ $   2,391    $  2,249  $  8  $       2   $ 4,650
Intersegment revenues.......       (655)         --    (1)        (1)     (657)
                              ---------    -------   ----  ---------   -------
Total.......................  $   1,736    $  2,249  $  7  $       1   $ 3,993
                              =========    ========  ====  =========   =======
Net income..................  $     601    $     70  $ 14  $     (68)  $   617
                              =========    ========  ====  =========   =======
Segment assets..............  $  18,941    $  4,680  $935  $   1,975   $26,531
                              =========    ========  ====  =========   =======

DECEMBER 31, 1999
- -----------------
Segment assets..............  $  18,752    $  4,695  $916  $   1,909   $26,272
                              =========    ========  ====  =========   =======

MARCH 31, 1999
- --------------
Sales and other
   operating revenues........ $   1,304    $  1,306  $ 17  $       1   $ 2,628
Intersegment revenues.......       (211)         --    (1)        (1)     (213)
                              ---------    --------  ----  ---------   -------
Total.......................  $   1,093    $  1,306  $ 16  $      --   $ 2,415
                              =========    ========  ====  =========   =======
Net income..................  $      89    $    129  $ 24  $     (77)      165
                              =========    ========  ====  =========   =======
</TABLE>

     For first quarter ended March 31, 2000 discontinued operations consisted of
one remaining unsold coal mine in Australia. For the first quarter ended March
31, 1999 discontinued operations consisted of the Company's Australian coal
operations and the operations of Union Texas Petrochemicals. At December 31,
1999 and March 31, 2000, the net assets of discontinued operations are included
with unallocated items in the segment presentation above.

     The amortization associated with a gain deferred in conjunction with the
sale of the chemicals operations had a favorable impact of approximately $12
million and $10 million after tax on Refining and Marketing earnings in the
first quarter 2000 and 1999, respectively.

NOTE D.  INVESTMENTS.

     At March 31, 2000 and 1999, investments in debt securities were primarily
composed of U.S. Treasury securities and corporate debt instruments. Maturities
generally ranged from three days to 10 years. These investments were classified
as short or long term depending on maturity. ARCO's investments in LUKOIL common
stock and Zhenhai Refining and Chemical Company convertible bonds were included
in other investments and long-term receivables. At March 31, 2000 and 1999, all
investments were classified as available-for-sale and were reported at fair
value, with unrealized holding gains and losses, net of tax, reported in
accumulated other comprehensive income.

     The following summarizes investments in securities at March 31:
<TABLE>
<CAPTION>
(MILLIONS)                                   2000         1999
                                           -------       ------
<S>                                        <C>           <C>
Aggregate fair value....................   $ 1,808       $  869
Gross unrealized holding losses.........        11           14
Gross unrealized holding gains..........      (592)         (73)
                                           -------       ------
Amortized cost..........................   $ 1,227       $  810
                                           =======       ======
</TABLE>


                                       6
<PAGE>

        NOTES TO CONSOLIDATED FINANCIAL STATEMENTS-UNAUDITED--(CONTINUED)

NOTE D. INVESTMENTS (CONTINUED)

     Investment activity for the three months ended March 31 was as follows:
<TABLE>
<CAPTION>
(MILLIONS)                                                2000    1999
                                                         ------  ------
<S>                                                      <C>     <C>
Gross purchases..........................................$4,736  $2,285
Gross sales..............................................    13     445
Gross maturities......................................... 4,628   2,078
</TABLE>

Gross realized gains and losses were insignificant and were determined by the
specific identification method.

NOTE E.  INVENTORIES.

     Inventories at March 31, 2000 and December 31, 1999 comprised the
following:
<TABLE>
<CAPTION>
                                                          MARCH 31,  DECEMBER 31,
(MILLIONS)                                                 2000          1999
                                                         ---------- ------------
<S>                                                      <C>         <C>
Crude oil and petroleum products........................ $      159  $        199
Other products..........................................         25            26
Materials and supplies..................................        201           205
                                                         ----------  ------------
  Total................................................. $      385  $        430
                                                         ==========  ============
</TABLE>

NOTE F.  CAPITAL STOCK.

     Detail of the Company's capital stock was as follows:
<TABLE>
<CAPTION>
                                                          MARCH 31,  DECEMBER 31,
                                                            2000          1999
                                                         ---------- ------------
<S>                                                      <C>         <C>
(THOUSANDS)
$3.00 Cumulative convertible reference stock,
par $1.................................................  $      39  $         41
$2.80 Cumulative convertible preference stock,
par $1.................................................        470           493
Common stock, par $2.50................................    818,070       816,673
                                                         ---------  ------------

  Total................................................  $ 818,579  $    817,207
                                                         =========  ============
</TABLE>

NOTE G.  CAPITALIZATION OF INTEREST.

     Interest expense excludes capitalized interest of $36 million and $39
million for the three-month periods ended March 31, 2000 and 1999, respectively.

NOTE H.  RESTRUCTURING PROGRAMS.

     Through December 31, 1999, the company had established reserves totalling
$251 million for the costs of terminating 1,250 employees. $103 million related
to short-term benefits such as severance payments and ancillary benefits such as
relocation and outplacement; $148 million related to pension and other
postretirement benefits.

     Through March 31, 2000, approximately 1,200 employees have been terminated
and approximately $88 million of severance and ancillary benefits have been paid
and charged against the accrual. Payments made do not necessarily correlate to
the number of terminations due to the ability of terminees to defer receipt of
certain payments.

UNION TEXAS PETROLEUM HOLDINGS, INC. (UTP) RESTRUCTURE.

     Through December 31, 1999, the company established a $90 million provision
for the termination of 357 employees resulting from the integration of UTP into
ARCO's operations. As of March 31, 2000, ARCO had terminated 355 of the
employees and had paid out a total of $83 million in severance benefits.

                                       7
<PAGE>

        NOTES TO CONSOLIDATED FINANCIAL STATEMENTS-UNAUDITED--(CONTINUED)

NOTE I.  INCOME TAXES.
<TABLE>
<CAPTION>
                                                                THREE MONTHS ENDED
    Provision for taxes on income:                                  MARCH 31,
                                                                --------------
                                                                   2000   1999
                                                                -------   ------
(MILLIONS)

<S>                                                            <C>       <C>
 Federal:
   Current....................................................  $   144   $   41
   Deferred...................................................       14       11
                                                                -------   ------
                                                                    158       52
                                                                -------   ------
  Foreign:
   Current....................................................      135       45
   Deferred...................................................      (61)     (17)
                                                                -------   ------
                                                                     74       28
                                                                -------   ------
 State:
   Current....................................................       39       12
   Deferred...................................................       --        1
                                                                -------   ------
                                                                     39       13
                                                                -------   ------
    Total.....................................................  $   271   $   93
                                                                =======   ======
</TABLE>

     Reconciliation of provision for taxes on income with tax at federal
statutory rate:
<TABLE>
<CAPTION>
                                                   THREE MONTHS ENDED
                                                       MARCH 31,
                                          ------------------------------------
                                                2000               1999
                                          ------------------ -----------------
                                                    PERCENT           PERCENT
                                                    OF                OF
                                                    PRETAX            PRETAX
(MILLIONS)                                AMOUNT    INCOME   AMOUNT   INCOME
                                          --------- -------  -------  --------
<S>                                       <C>       <C>      <C>      <C>
 Income before income taxes and
 minority interest......................  $    902    100.0  $   261     100.0
                                          ========  =======  =======  ========
 Tax at federal statutory rate..........  $    316     35.0  $    91      35.0
 Increase (reduction) in taxes
 resulting from:
   Taxes on foreign income (less)
    greater
      than statutory rate...............       (40)    (4.4)      21       8.0
   State income taxes (net of federal
    effect).............................        25      2.8        8       3.1
   Tax credits..........................       (29)    (3.2)     (24)     (9.2)
   Other................................        (1)    (0.2)      (3)     (1.3)
                                          ------------------ -------- --------
 Provision for taxes on income..........  $    271     30.0  $    93      35.6
                                          ========  =======  =======  ========
</TABLE>

NOTE J.  DISCONTINUED OPERATIONS.

     In 1999, ARCO disposed of its interests in two Australian coal mines and
its stake in the Clermont coal deposit in Australia. At March 31, 2000, the
carrying value of the remaining Australian assets, consisting of one coal mine,
was $68 million and was included in net assets of discontinued operations on the
balance sheet. Beginning in January 1999, ARCO suspended depreciation on the
Australian coal assets (1998 annual depreciation was $23 million).

     As part of the acquisition of UTP, ARCO determined it would sell UTP's
petrochemical business. In March 1999, Arco sold Union Texas Petrochemicals to
Williams Energy Services.

                                       8
<PAGE>

        NOTES TO CONSOLIDATED FINANCIAL STATEMENTS-UNAUDITED--(CONTINUED)

NOTE J.  DISCONTINUED OPERATIONS (CONTINUED).

     Revenues and income from discontinued operations for the three months ended
March 31, 2000 and 1999 were:
<TABLE>
<CAPTION>
                                    THREE MONTHS ENDED
                                         MARCH 31
                                    ------------------
                                       2000    1999
                                     -------- --------
(MILLIONS)
<S>                                  <C>      <C>
Revenues:
  Coal operations..................  $     26 $    26
  UTP petrochemical................        --      24
                                     -------- -------
   Total...........................  $     26 $    50
                                     ======== =======
Net income:
  Coal operations..................  $     -- $    --
  UTP petrochemical................        --      --
                                     -------- -------
   Total...........................  $    --  $    --
                                     ======== =======
</TABLE>

NOTE K.  EARNED PER SHARE.

     The information necessary for the calculation of earned per share is as
follows:
<TABLE>
<CAPTION>
                                                       THREE MONTHS ENDED
                                                          MARCH 31, 2000
                                                    --------------------------
                                                     INCOME   SHARES  PER SHARE
                                                    -------- -------- ---------
(MILLIONS, EXCEPT PER SHARE AMOUNTS)
<S>                                                 <C>      <C>      <C>
Net income........................................  $ 617.0
Less:  Preference stock dividends.................      (.4)
                                                    -------
Net income available to common stockholders--basic
EPS...............................................    616.6    323.4  $  1.91
                                                                      =======
Effect of dilutive securities:
Contingently issuable shares (primarily options)..               2.9
Convertible preference stock......................       .4      2.8
                                                    -------  -------
 Net income available to common stockholders and
  assumed conversions--diluted EPS................  $ 617.0     329.1  $  1.87
                                                    =======  =======  =======
</TABLE>
<TABLE>
<CAPTION>
                                                       THREE MONTHS ENDED
                                                         MARCH 31, 1999
                                                    --------------------------
                                                    INCOME   SHARES   PER SHARE
                                                    -------  -------  ---------
<S>                                                 <C>      <C>      <C>
Net income........................................  $ 165.4
Less:  Preference stock dividends.................      (.5)
                                                    -------
Net income available to common stockholders--basic
EPS...............................................    164.9    321.6  $    0.51
                                                                      =========
Effect of dilutive securities:
Contingently issuable shares (primarily options)..               2.2
Convertible preference stock......................       .5      3.4
                                                    -------- -------
Net income available to common stockholders and
  assumed conversions--diluted EPS................  $ 165.4  $ 327.2  $    0.51
                                                    =======  =======  =========
</TABLE>
                                       9
<PAGE>

                         NOTES TO CONSOLIDATED FINANCIAL
                       STATEMENTS - UNAUDITED--(CONTINUED)


NOTE L.       SUPPLEMENTAL INCOME STATEMENT INFORMATION.

       Taxes other than income taxes comprised the following:
<TABLE>
<CAPTION>

                                                                                                THREE MONTHS ENDED
                                                                                                     MARCH 31,
                                                                                                --------------------
                                                                                                  2000       1999
                                                                                                ---------  ---------
(MILLIONS)
<S>                                                                                             <C>        <C>
Production/severance.........................................................................   $      96  $     40
Property.....................................................................................          36        35
Other .......................................................................................          45        45
                                                                                                ---------- ---------
Total........................................................................................   $     177  $    120
                                                                                                ========== =========
</TABLE>

NOTE M.       SUPPLEMENTAL CASH FLOW INFORMATION.

       Following is supplemental cash flow information for the three months
ended March 31, 2000 and 1999:
<TABLE>
<CAPTION>

                                                                                               THREE MONTHS ENDED
                                                                                                   MARCH 31,
                                                                                               -------------------
                                                                                                 2000      1999
                                                                                               ---------  --------
(MILLIONS)
<S>                                                                                            <C>        <C>
  Gross sales and maturities of short-term investments......................................   $     13   $    15
  Gross purchases of short-term investments.................................................         (6)      (10)
                                                                                               ---------  --------
  Net cash provided by short-term investments...............................................   $      7   $     5
                                                                                               =========  ========
  Gross proceeds from issuance of notes payable.............................................   $  3,697   $ 3,737
  Gross repayments of notes payable.........................................................     (3,883)   (3,535)
                                                                                               ---------  --------
  Net cash provided (used) by notes payable.................................................   $   (186)  $   202
                                                                                               =========  ========
  Gross noncash provisions charged to income................................................   $     38   $    37
  Cash payments of previously accrued items.................................................       (124)     (162)
                                                                                               ---------  --------
  Cash payments greater than noncash provisions.............................................   $    (86)  $  (125)
                                                                                               =========  ========
  Interest paid.............................................................................   $     84   $   101
                                                                                               =========  ========
  Income taxes paid.........................................................................   $     90   $    98
                                                                                               =========  ========
</TABLE>

       Changes in working capital accounts for the three-month periods ended
March 31, 2000 and 1999 were as follows:
<TABLE>
<CAPTION>

                                                                                             THREE MONTHS ENDED
                                                                                                  MARCH 31,
                                                                                             --------------------
                                                                                               2000       1999
                                                                                             ---------  ---------
(MILLIONS)
<S>                                                                                          <C>        <C>
Increase (decrease) to cash
   Accounts receivable....................................................................   $   (126)  $    (16)
   Inventories............................................................................         35        (16)
   Accounts payable.......................................................................         56       (146)
   Other working capital..................................................................        (37)      (118)
                                                                                             ---------  ---------
     Total................................................................................   $    (72)  $   (296)
                                                                                             =========  =========
</TABLE>

NOTE N.       OTHER COMMITMENTS AND CONTINGENCIES

     ARCO has commitments, including those related to the acquisition,
construction and development of facilities, all made in the normal course of
business.

     ARCO has also guaranteed all of LUKARCO's obligations associated with the
Caspian pipeline project, which amount to 25% of all funding requirements for
this project. The current estimates of total project funding requirements are
between $2.2 to $2.4 billion.

     Following the March 1989 EXXON VALDEZ oil spill, numerous federal, state
and private plaintiff lawsuits were brought against Exxon, Alyeska Pipeline
Service Company (Alyeska), and Alyeska's owner companies including ARCO, which
owns approximately 22%. While all of the federal, state and private plaintiff
lawsuits have

                                       10
<PAGE>

                         NOTES TO CONSOLIDATED FINANCIAL
                       STATEMENTS - UNAUDITED--(CONTINUED)

NOTE N.       OTHER COMMITMENTS AND CONTINGENCIES (CONTINUED)

been settled, certain issues relating to the liability for the spill remain
unresolved between Exxon and Alyeska (including its owner companies).

     Lawsuits, including purported class actions and actions by governmental
entities, are pending or threatened against ARCO and others seeking damages,
abatement of the housing units, and compensation for medical problems arising
out of the presence of lead-based paint in certain housing units. ARCO is unable
to predict the scope or amount of any such liability.

     The State of Montana, along with the United States and the Salish and
Kootenai Tribes, have been seeking recovery from ARCO of alleged injuries to
natural resources resulting from mining and mineral processing businesses
formerly operated by Anaconda. In April 1998, ARCO entered two consent decrees,
settling all of the natural resources damage claims of the United States and the
tribes and the bulk of such claims of the State of Montana. Remaining for
disposition are the State's claims for $206 million of restoration damages at
three sites.

     ARCO is subject to liability pursuant to various federal, state and local
environmental laws and regulations that require ARCO to do some or all of the
following:

     o    Remove or mitigate the effects on the environment at various sites
          from the disposal or release of certain substances;

     o    Perform restoration work at such sites; and

     o    Pay damages for loss of use and non-use values.

The federal agencies involved with the sites included the Department of the
Interior, Department of Justice and Environmental Protection Agency.
Environmental liabilities include personal injury claims allegedly caused by
exposure to toxic materials manufactured or used by ARCO.

     ARCO is currently involved in assessments and cleanups under these laws at
federal- and state-managed sites as well as other clean-up sites including
service stations, refineries, terminals, third-party landfills, former nuclear
processing facilities, sites associated with discontinued operations and sites
previously owned by ARCO or predecessors. This comprises 130 sites for which
ARCO has been named a potentially responsible party (PRP), along with other
sites for which no claims have been asserted. The number of PRP sites in and of
itself is not a relevant measure of liability because the nature and extent of
environmental concerns varies by site and ARCO's share of responsibility varies
from sole responsibility to very little responsibility.

     ARCO may in the future be involved in additional assessments and cleanups.
Future costs depend on unknown factors such as:

     o    Nature and extent of contamination;

     o    Timing, extent and method of remedial action;

     o    ARCO's proportional share of costs; and

     o    Financial condition of other responsible parties.

     The environmental remediation accrual is updated annually, at a minimum,
and at March 31, 2000, was $686 million. As these costs become more clearly
defined, they may require future charges against earnings. Applying Monte Carlo
analysis to estimated site maximums on a portfolio basis, ARCO estimates that
future costs could exceed the amount accrued by as much as $550 million.

     Approximately 60% of the reserve related to sites associated with ARCO's
discontinued operations, primarily mining activities in the states of Montana,
Utah and New Mexico. Another significant component related to currently and
formerly owned chemical, nuclear processing, and refining and marketing
facilities, and other sites which received wastes from these facilities. One
site represented 11% of the total accrual. No other site represented more than
7% of the total accrual. The remainder related to other sites with reserves
ranging from $1 million to $10 million per site. Substantially all amounts
accrued are expected to be paid out over the next six years.

     Claims for recovery of remediation costs already incurred and to be
incurred in the future have been filed against various third parties. Many of
these claims have been resolved. ARCO has neither recorded any asset nor reduced
any liability in connection with unresolved claims.


                                       11
<PAGE>

                         NOTES TO CONSOLIDATED FINANCIAL
                       STATEMENTS - UNAUDITED--(CONTINUED)

NOTE N.       OTHER COMMITMENTS AND CONTINGENCIES (CONTINUED)

     Although any ultimate liability arising from any of the matters described
herein could result in significant expenses or judgments that, if aggregated and
assumed to occur within a single fiscal year, would be material to ARCO's
results of operations, the likelihood of such occurrence is considered remote.
On the basis of management's best assessment of the ultimate amount and timing
of these events, such expenses or judgments are not expected to have a material
adverse effect on ARCO's consolidated financial statements.

     The operations and consolidated financial position of ARCO continue to be
affected by domestic and foreign political developments as well as legislation,
regulations and litigation pertaining to restrictions on production, imports and
exports, tax increases, environmental regulations, cancellation of contract
rights and expropriation of property. Both the likelihood of such occurrences
and their overall effect on ARCO vary greatly and are not predictable.

     These uncertainties are part of a number of items that ARCO has taken and
will continue to take into account in periodically establishing reserves.

NOTE O.       SUBSEQUENT EVENTS

MERGER OF ARCO INTO BP AMOCO P.L.C.  AND CHANGE OF CONTROL OF ARCO

     On April 18, 2000, the combination of BP Amoco p.l.c. (BP Amoco) and ARCO
was completed by the merger of Prairie Holdings, Inc. (a subsidiary of BP Amoco)
with and into ARCO, pursuant to the terms of the merger agreement dated March
31, 1999, as amended through March 8, 2000 (Merger Agreement). Pursuant to the
Merger Agreement, each share of outstanding common stock of ARCO (save for any
such shares owned by BP Amoco, ARCO or any subsidiary of BP Amoco or ARCO) was
converted into the right to receive 1.64 BP Amoco American Depositary Receipts
(ADRs) or, subject to the timely receipt of elections therefor, 9.84 BP Amoco
Ordinary Shares. In addition, the outstanding ARCO common stock was delisted
from the New York Stock Exchange and other exchanges on which it had been
listed.

     ARCO's outstanding shares of $2.80 and $3.00 Preference Stock remain listed
on the New York Stock Exchange. Pursuant to the Merger Agreement, each share of
$2.80 Preference Stock was converted into the right to receive 7.872 ADRs and
each share of $3.00 Preference Stock was converted into the right to receive
22.304 ADRs. ARCO remains a reporting company within the meaning of the
Securities and Exchange Act of 1934.

     In connection with the merger, on April 18, 2000, ARCO issued 324,711,290
shares of common stock to BP Amoco. Later on April 18, 2000, BP Amoco
transferred all such shares to BP America, Inc., a wholly owned subsidiary of BP
Amoco, so that BP Amoco owns indirectly all of the currently outstanding common
stock of ARCO. As the holder of all the outstanding common stock of ARCO, none
of which is publicly traded, BP Amoco is the controlling shareholder of ARCO.

     Included in the merger agreement was a provision requiring BP Amoco to keep
in place for two years following the merger ARCO's change of control severance
programs. The benefits associated with those programs will result in ARCO
recording later in the year a potentially significant charge for ARCO employees
who are terminated in the next two years as a result of the merger. In addition,
there will be charges for other merger related costs.

SALE OF ALASKAN BUSINESSES

     On March 15, 2000 ARCO entered into an agreement to sell its Alaskan
businesses to Phillips Petroleum Company (Phillips) for approximately $6.5
billion cash subject to purchase price adjustments (plus up to an additional
$500 million based on the prices realized on production subsequent to December
31, 1999). Under the purchase and sale agreement, which was amended on April 6,
2000, ARCO agreed to sell all of the outstanding shares of ARCO Alaska, Inc.,
together with certain other subsidiaries of ARCO engaged principally in the
operation of ARCO's Alaskan businesses, along with certain pipeline and marine
assets associated with the transport of Alaskan crude oil. The major portion
of the sale closed on April 26, 2000. The remainder of the assets are expected
to be transferred upon receipt of governmental approvals.

                                       12
<PAGE>

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

MERGER OF ARCO INTO BP AMOCO P.L.C. AND CHANGE OF CONTROL OF ARCO

     On April 18, 2000, the combination of BP Amoco and ARCO was completed. ARCO
became a wholly owned subsidiary of BP Amoco. As indirect owner of all of the
outstanding shares of common stock of ARCO, BP Amoco is the controlling
shareholder of ARCO. (See Note O. to the financial statements and Item 5
beginning on page 18 of this Report on Form 10-Q).

FIRST QUARTER 2000 VS. FIRST QUARTER 1999

CONSOLIDATED EARNINGS

     The $452 million increase in net income in the first quarter of 2000
reflected higher crude oil prices, and to a lesser extent, higher U.S. natural
gas prices. These factors were partially offset by lower crude oil and natural
gas production volumes, as well as higher operating and exploration expense and
lower earnings from the refinery and marketing segment.

     A net special items benefit in the first quarter 2000 totaled $34 million
and consisted of net gains on asset sales, partially offset by a provision
associated with a patent lawsuit, BP Amoco merger costs and charges for future
environmental remediation.

     For the first quarter of 1999, net special items charges totaled $7 million
and consisted primarily of charges for future environmental remediation.

AFTER-TAX SEGMENT EARNINGS

<TABLE>
<CAPTION>
                                                                                                 2000     1999
                                                                                                -------- --------
(MILLIONS)
<S>                                                                                             <C>      <C>
Exploration and production...................................................................   $   601  $    89
Refining and marketing.......................................................................        70      129
Other operations.............................................................................        14       24
Interest expense.............................................................................       (79)     (70)
Other unallocated expenses...................................................................        11       (7)
                                                                                                -------- --------
   Net income................................................................................   $   617  $   165
                                                                                                ======== ========
</TABLE>

EXPLORATION AND PRODUCTION

     ARCO's earnings from worldwide oil and gas exploration and production
operations in the first quarter 2000 were significantly impacted by higher crude
oil prices and, to a lesser extent, higher U.S. natural gas prices and lower
operating expenses. These factors were partially offset by lower crude oil and
natural gas production volumes and increased exploration expense. Operating
expenses were $17 million lower in the first quarter of 2000, compared to the
same period in 1999. The earnings in the first quarter of 2000 included a
special item benefit of $58 million after tax from assets sales. There were no
special items in the first quarter of 1999.


                                       13
<PAGE>

                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
           FINANCIAL CONDITION AND RESULTS OF OPERATIONS--(CONTINUED)


AVERAGE OIL & GAS PRICES
<TABLE>
<CAPTION>

                                                                                                 2000      1999
                                                                                               ---------  --------
<S>                                                                                            <C>        <C>
  U.S.
     Petroleum liquids--per barrel (bbl)
       Alaska...............................................................................   $  20.32   $  6.07
       Lower 48, including Vastar...........................................................   $  23.34   $  9.75
       Composite average price..............................................................   $  21.28   $  7.17
     Natural gas--per thousand cubic feet (mcf).............................................   $   2.18   $  1.60
  International

     Petroleum liquids composite average--per bbl............................................  $  22.08   $  9.16
     Venezuela crude oil--per bbl............................................................  $  12.00   $  3.17
     Natural gas (excluding LNG)--per mcf....................................................  $   2.36   $  2.47
     Indonesia LNG...........................................................................  $   4.78   $  2.31
</TABLE>

PETROLEUM LIQUIDS AND NATURAL GAS PRODUCTION
<TABLE>
<CAPTION>

                                                                                           2000          1999
                                                                                        ------------  ------------
<S>                                                                                      <C>           <C>
  Net Production
  U.S.
     Petroleum liquids--bbl/day
       Alaska........................................................................       307,300       345,100
       Vastar........................................................................        66,800        55,900
       Other Lower 48................................................................        75,700        92,200
         Total.......................................................................       449,800       493,200
     Natural gas--mcf/day............................................................     1,258,300     1,359,800
     Barrels of oil equivalent (BOE)/day*............................................       659,500       719,800

  International
     Petroleum liquids--bbl/day......................................................       138,700       179,100
     Natural gas--mcf/day............................................................     1,261,400     1,228,600
     BOE/day.........................................................................       349,000       383,900

  Total net production BOE/day.......................................................     1,008,500     1,103,700
</TABLE>
- --------------
* Natural gas converted at the ratio of 6 mcf to 1 barrel of liquid.

     In 2000, the reduction in U.S. petroleum liquids production primarily
resulted from natural field declines in Alaska and the effect of higher crude
oil prices on the ARCO Long Beach , Inc. production contract. The decreased
international petroleum liquids volumes primarily reflected lower Indonesian,
Tunisian and United Kingdom North Sea production volumes. The Indonesian
decrease resulted from the impact of higher crude oil prices on production
sharing contracts. The decreased Tunisian production reflected the sale of the
Ashtart field, which was effective January 1, 2000. The decrease in United
Kingdom North Sea production resulted from natural field decline.

     The increase in international natural gas volumes in 2000 primarily
reflected higher production in Indonesia and the Yacheng 13 field in China
offset by a net decrease in United Kingdom North Sea production of approximately
30 million cubic feet per day due to natural field decline. The first quarter
2000 decrease in U.S. natural gas volumes reflected lower production from Vastar
Resources, Inc. (Vastar), which is 81.9 % owned by ARCO. The lower Vastar
production resulted from natural field declines and asset sales during the last
nine months of 1999.

     ARCO's exploration and production earnings and petroleum liquids production
will decline significantly with the sale of Alaskan businesses to Phillips (see
Sale of Alaskan businesses).


                                       14
<PAGE>

                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
           FINANCIAL CONDITION AND RESULTS OF OPERATIONS--(CONTINUED)


REFINING AND MARKETING

     In the first quarter of 2000, refining and marketing earnings decreased
primarily as a result of the establishment of a reserve for a patent lawsuit and
higher refinery turnaround costs. In addition, higher crude oil costs were
mostly, but not completely, offset by increased retail marketing prices and
volumes.

     The amortization associated with the deferral of part of the pre-tax gain
on the sale of the ARCO Chemical interest in 1998 had a net favorable impact of
approximately $12 million and $10 million after tax on refining and marketing
earnings in the first quarter of 2000 and 1999, respectively. See the Company's
Annual Report on Form 10-K for the year ended December 31, 1999 for a further
discussion of the deferred gain.

WEST COAST PETROLEUM PRODUCTS SALES
<TABLE>
<CAPTION>

                                                                                             2000         1999
                                                                                          -----------  -----------
<S>                                                                                          <C>          <C>
  VOLUMES (BARRELS/DAY)
  Gasoline.............................................................................      341,100      310,000
  Jet..................................................................................      103,900       98,500
  Distillate...........................................................................       86,900       87,900
  Other................................................................................       51,700       59,100
                                                                                          -----------  -----------
     Total.............................................................................      583,600      555,500
                                                                                          ===========  ===========
</TABLE>

OTHER OPERATIONS

     The 2000 and 1999 results from ARCO's other operations included the
earnings from Lower 48 pipeline operations and an aluminum rolling facility. The
lower pipeline earnings reflected a decrease in volumes for the Seaway pipeline
and losses incurred on the Olympic Pipeline.

DISCONTINUED OPERATIONS

     In June of 1998, ARCO disposed of its U.S. coal operations. As of March
1999, ARCO sold its interests in three Australian coal mines. ARCO sold its 80%
interest in the Gordonstone coal mine, its 31.4% interest in the Blair Athol
Joint Venture and its stake in the Clermont coal deposit. At March 31, 2000, the
Company's discontinued operations consisted of one remaining coal mine in
Australia.

     In March 1999, ARCO sold its wholly owned subsidiary, Union Texas
Petrochemicals obtained during the 1998 acquisition of Union Texas Petroleum
Holdings, Inc.

     ARCO had no earnings from discontinued operations in the first quarter of
2000, because income or loss from the remaining Australian coal operation is
being deferred as part of net assets from discontinued operations on the balance
sheet at March 31, 2000.

CONSOLIDATED REVENUES
<TABLE>
<CAPTION>

  (MILLIONS)                                                                                    2000       1999
                                                                                               --------  ---------
<S>                                                                                            <C>       <C>
  SALES AND OTHER OPERATING REVENUES
  Exploration and production...............................................................    $ 2,391   $  1,304
  Refining and marketing...................................................................      2,249      1,306
  Other....................................................................................         10         18
  Intersegment eliminations................................................................       (657)      (213)
                                                                                               --------  ---------
     Total.................................................................................    $ 3,993   $  2,415
                                                                                               ========  =========
</TABLE>

     The increase in exploration and production sales and other operating
revenues resulted primarily from higher crude oil prices and, to a much lesser
extent, higher domestic natural gas prices. Refining and marketing sales and
other operating revenues increased primarily because of higher refined products
prices, and to a lesser extent, higher gasoline volumes.


                                       15
<PAGE>

                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
           FINANCIAL CONDITION AND RESULTS OF OPERATIONS--(CONTINUED)


CONSOLIDATED EXPENSES

     Trade purchases were higher in the first quarter of 2000 primarily as a
result of higher crude oil prices and, to a lesser extent, higher purchased
volumes of finished refined products.

     The increase in operating expenses in the first quarter of 2000 reflected
refining and marketing expenses associated with the establishment of a reserve
for a patent lawsuit and higher refinery turnaround costs. These factors were
partially offset by a decline in exploration and production and Lower 48
pipeline operating expenses related to the Company's cost reduction programs.

     The lower selling, general and administrative expenses in 2000 were
primarily in the corporate (unallocated) and refining and marketing segments and
resulted from the Company's cost reduction programs.

     The increase in exploration expense in the first quarter 2000 resulted from
higher dry hole expense due to the write-off of two offshore wells (one
deepwater well and one shelf well).

     The increase in taxes other than income taxes in 2000 primarily resulted
from the impact of higher crude oil prices on U.S. production taxes, partially
offset by lower production volumes.

INCOME TAXES

     The Company's effective tax rate was 30.0% in the first quarter 2000,
compared to 35.6% in the 1999 first quarter. The effective tax rate in the first
quarter of 2000 was lower than the federal statutory rate, primarily as a result
of a lower effective tax rate associated with the sale of certain foreign
properties.

LIQUIDITY AND CAPITAL RESOURCES
<TABLE>
<CAPTION>
                                                                                                          --------
  (MILLIONS)                                                                                               2000
                                                                                                          --------
<S>                                                                                                       <C>
  Cash flow provided (used) by:
  Operations...........................................................................................   $   856
  Investing activities.................................................................................   $  (279)
  Financing activities.................................................................................   $  (437)
</TABLE>

     The net cash used by investing activities in the first quarter 2000
included expenditures for additions to fixed assets of $619 million and proceeds
from asset sales of $446 million (approximately $360 million associated with
asset sales of foreign properties). The Company expects total capital
expenditures for additions to fixed assets to approximate $2.1 billion for the
full year 2000. The budget was revised downward to give effect to the sale of
the Alaskan assets in April 2000.

     The net cash used by financing activities in the first quarter of 2000
included repayments of short-term debt of $186 million and dividend payments of
$232 million.

     Cash and cash equivalents and short-term investments totaled $1.3 billion,
and short-term borrowings were $1.5 billion at the end of the first quarter of
2000.

     Beginning in 1997 and continuing through the first quarter of 1999, the
Company utilized increased short-term borrowing in lieu of increased long-term
borrowing (other than long-term debt assumed in connection with the UTP
acquisition in 1998). As a result the Company is in a working capital deficit
position of $613 million at March 31, 2000.

     The Company believes it has adequate resources and liquidity to fund future
cash requirements for working capital, capital expenditures, dividends and debt
repayments with cash from operations, existing cash balances, additional short-
and long-term borrowing, cash infusions from ARCO's parent company BP Amoco and
the sale of assets.


                                       16
<PAGE>

                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
           FINANCIAL CONDITION AND RESULTS OF OPERATIONS--(CONTINUED)


SALE OF ALASKAN BUSINESSES

     On March 15, 2000 ARCO entered into an agreement to sell its Alaskan
businesses to Phillips Petroleum Company (Phillips) for approximately $6.5
billion cash subject to purchase price adjustments (plus up to an additional
$500 million based on the realized prices of production subsequent to December
31, 1999). Proceeds from the sale were advanced to BP Amoco. Under the purchase
and sale agreement, which was amended on April 6, 2000, ARCO agreed to sell all
of the outstanding share of ARCO Alaska, Inc., together with certain other
subsidiaries of ARCO engaged principally in the operation of ARCO's Alaskan
businesses, along with certain pipeline and marine assets associated with the
transport of Alaskan crude oil. The major portion of the sale closed on April
26, 2000. The remainder of the assets are expected to be transferred upon
receipt of governmental approvals.

     Included in the merger agreement was a provision requiring BP Amoco to keep
in place for two years following the merger ARCO's change of control severance
programs. The benefits associated with those programs will result in ARCO
recording later in the year a potentially significant charge for ARCO employees
who are terminated in the next two years as a result of the merger. In addition,
there will be charges for other merger related costs.

STATEMENTS OF FINANCIAL ACCOUNTING STANDARDS NOT YET ADOPTED

     In June 1998, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards (SFAS) No. 133, "Accounting for Derivative
Instruments and Hedging Activities." SFAS No. 133 requires companies to adopt
its provisions for all fiscal quarters of all fiscal years beginning after June
15, 2000 (as deferred by SFAS No. 137). Earlier application of all of the
provisions of SFAS No. 133 is permitted, but the provisions cannot be applied
retroactively to financial statements of prior periods. SFAS No. 133
standardizes the accounting for derivative instruments by requiring that an
entity recognize those items as assets or liabilities in the statement of
financial position and measure them at fair value. The Company has not yet
completed evaluating the impact of the provisions of SFAS No. 133.

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

     Management cautions against projecting any future results based on present
earnings levels because of economic uncertainties, the extent and form of
existing or future governmental regulations and other possible actions by
governments.
                                       17
<PAGE>

                           PART II. OTHER INFORMATION

ITEM 1.   LEGAL PROCEEDINGS.

     1.   On March 23, 2000, ARCO (as successor to IS&R and Anaconda Lead
Products Company) was named as a defendant in a purported class action lawsuit,
COUNTY OF SANTA CLARA V. ATLANTIC RICHFIELD COMPANY, ET AL. (Case No. CV788657),
filed in Santa Clara County Superior Court in San Jose, California by the County
of Santa Clara on behalf of itself and seeking to represent a class of all
public entities in California who expend any funds for medical treatment,
educational expenses, abatement or other costs and expenses due to exposure to
or potential exposure to lead paint. The complaint, which also names seven
alleged former manufacturers of lead pigments and the LIA, includes causes of
action for violation of California Business & Professions Code ss. 17200, strict
product liability, failure to warn, market share liability, negligence, fraud
and concealment, and unjust enrichment. The County of Santa Clara and the
purported class seek compensatory and punitive damages as well as indemnity for
past, present, and future costs associated with the medical care of lead
poisoned children and adults, education programs for children injured as a
result of lead exposure, and the abatement of lead hazards.

     2.   Reference is made to the disclosure regarding a purported class
action filed against ARCO and Babcock & Wilcox Company (B&W) described on page
17 of ARCO's Report on Form 10-K for the year ended December 31, 1999. On
February 22, 2000, B & W filed a voluntary petition for relief under Chapter 11
of the Bankruptcy Code in the United States Bankruptcy Court for the Eastern
District of Louisiana. On April 4, 2000, B &W filed an adversary complaint in
the Bankruptcy Court against the plaintiffs in the Hall v. B & W action, seeing
to confirm that the automatic stay applicable to actions against the debtor
operates to stay the Hall case in its entirety, including any claims against
ARCO. The Bankruptcy Court has not ruled on this complaint.

     3.   Reference is made to the disclosure regarding the action titled
ARCO, et al. v. UNOCAL described on page 18 of ARCO's Report on Form 10-K for
the year ended December 31, 1999. On September 29, 1998, the court issued a
judgment in favor of UNOCAL for $10.3 million (including prejudgment interest)
against ARCO for infringing gallons during the first five months of production
and for $1.5 million joint and several against ARCO and the other five refiners
for UNOCAL's attorneys fees. On March 29, 2000, the Court of Appeals for the
Federal Circuit affirmed the judgment.

     4.   On March 17, 2000, six purported class action suits were filed in
New Castle County, Delaware Chancery Court against Vastar Resources, Inc.,
Atlantic Richfield Company, BP Amoco, and Vastar's nine individual directors.
The suits are brought by individual Vastar stockholders on behalf of a
purported class of all Vastar minority stockholders. The suits allege that BP
Amoco's proposed tender offer price for Vastar's minority shares is
inadequate. The suits generally seek class action certification, an
injunction against BP Amoco's tender offer as it is presently proposed,
rescission or rescissory damages, other monetary damages, and attorney fees
and court costs. The first-filed of the suits is Giarraputo  v. Callison, et
al. (Case No. 17888-NC). ARCO, Vastar, and Vastar's nine directors have been
officially served in two of the six suits, Giarraputo and Rothe v. Vastar
Resources, Inc., et al. (Case No. 17891-NC).

     5.   Reference is made to the disclosure regarding the Aguilar action
described on page 18 of ARCO's Report on Form 10-K for the year ended December
31, 1999. On January 31, 2000, the Court of Appeal for the Fourth Appellate
District reversed the order granting a new trial and ordered the Superior Court
to grant summary judgment in favor of each defendant. On March 1, 2000, the
Court of Appeal denied the plaintiffs' petition for rehearing. On March 13,
2000, the plaintiffs filed a petition for review by the California Supreme
Court.

     6.   Reference is made to the Company's 1999 Form 10-K Report for
information on other legal proceeding matters reported therein.

ITEM 5.   OTHER.

     A.   CHANGE OF CONTROL OF ARCO

     On April 18, 2000, the combination of BP Amoco p.l.c. (BP Amoco) and ARCO
was completed by the merger of Prairie Holdings, Inc (a subsidiary of BP Amoco)
with and into ARCO, pursuant to the terms of the merger agreement dated March
31, 1999, as amended through March 27, 2000 (Merger Agreement). Pursuant to the
Merger Agreement, each share of outstanding common stock of ARCO (except for any
such shares owned by BP

                                       18
<PAGE>

Amoco, ARCO or any subsidiary of BP Amoco or ARCO) was converted into the right
to receive 1.64 BPAmoco American Depositary Receipts (ADRs) or, subject to the
timely receipt of elections therefor, 9.84 BP Amoco Ordinary Shares. In
addition, the outstanding ARCO common stock was delisted from the New York Stock
Exchange and other exchanges on which it had been listed. In connection with the
merger, on April 18, 2000, ARCO issued 324,711,290 new shares of common stock to
BP Amoco. Later on April 18, 2000, BP Amoco transferred all such shares to BP
America, Inc., a wholly owned subsidiary of BP Amoco, so that BP Amoco owns
indirectly all of the currently outstanding common stock of ARCO. As the holder
of all the outstanding common stock of ARCO, none of which is publically traded,
BP Amoco is the controlling shareholder of ARCO. ARCO's outstanding shares of
$2.80 and $3.00 Preference Stock remain listed on the New York Stock Exchange.
Pursuant to the Merger Agreement, each share of $2.80 Preference Stock became
convertible into 7.872 ADRs and each share of $3.00 Preference Stock became
convertible into 22.304 ADRs. ARCO remains a reporting company within the
meaning of the Securities and Exchange Act of 1934.

     Also in connection with the merger, all of ARCO's directors and officers,
including its executive officers listed in ARCO's Report on Form 10-K for the
year ended December 31, 1999, resigned concurrently with the effective date of
the merger, April 18, 2000. Effective April 18, 2000, and pursuant to the Merger
Agreement, as amended, the directors of Prairie Holdings, Inc became the
directors of ARCO. Accordingly the directors of ARCO now are:

Peter B. P. Bevan
John F. Campbell
D. Patrick Chapman
Robert D. Agdern
James G. Nemeth

     As of May 11, 2000, the following individuals are officers of ARCO:

President Robert D. Agdern
Chief Financial Officer and Vice President Eileen A. Kamerick
Executive Vice President David H. Welch
Executive Vice President Roger E. Williams
Vice President W. Murray Air
Vice President Larry D. Burton
Vice President-Human Resources John F. Campbell
Vice President Lucy I. Davies
Vice President Mike Hoffman
Vice President William R. Hutchinson
Vice President Chris Noble
Vice President Anthony J. Nocchiero
Vice President Richard Porter
Vice President Edward W. Sturrus
Vice President David R. Watson
Vice President and General Tax Officer James G. Nemeth
Corporate Secretary Daniel B. Pinkert
Treasurer Robert J. Novaria
Tax Officer Dale P. Shrallow
Controller Anthony J. Nocchiero
Assistant Controller Charles L. Hall

     All of the above individuals are employees of BP Amoco or of a subsidiary
company of BP Amoco. None of these individuals own any shares of ARCO common or
preference stocks.

     On April 18, 2000, in connection with the combination of ARCO and BP Amoco,
PricewaterhouseCoopers LLP resigned as ARCO's independent accountants. Ernst &
Young LLP, who currently act as independent accountants for BP Amoco, have been
appointed as ARCO's independent accountants.

                                       19
<PAGE>

     B.   ANNUAL MEETING OF STOCKHOLDERS SET FOR JULY 11, 2000

     The Board of Directors of ARCO have fixed the Annual Meeting of
Shareholders for Tuesday, July 11, 2000. Notice of Meeting and a Proxy
Statement will be mailed to shareholders of record on June 2, 2000. Shareholders
of ARCO include BP Amoco, as holder of all the outstanding shares of Common
Stock, and holders of the $2.80 and $3.00 Preference Stock, all of which vote as
one class with the holder of the Common Stock.

     C.   SALE OF ALASKAN BUSINESSES AND PRO FORMA FINANCIAL STATEMENTS.

     On March 15, 2000, pursuant to an understanding with the Federal Trade
Commission in conjunction with its review of the acquisition of ARCO by BP
Amoco, ARCO entered into an agreement to sell its Alaskan businesses to Phillips
Petroleum Company (Phillips) for approximately $6.5 billion cash, subject to
purchase price adjustments (plus up to an additional $500 million based on
post-closing production). Under the purchase and sale agreement, which was
amended on April 6, 2000, ARCO agreed to sell all of the outstanding shares of
ARCO Alaska, Inc., together with certain other subsidiaries of ARCO engaged
principally in the operation of ARCO's Alaskan businesses, along with certain
pipeline and marine assets associated with the transport of Alaskan crude oil.
The major portion of the sale closed on April 26, 2000. The remainder of the
assets are expected to be transferred upon receipt of governmental approvals.

     The following unaudited pro forma financial statements include certain
adjustments to the historical financial statements of the Company. Such
adjustments are made to give effect to the sale of ARCO's Alaskan businesses to
Phillips. These adjustments reflect the elimination of ARCO Alaska, Inc.
balances, as well as those pipeline and marine assets associated with the
transport of Alaskan crude oil from ARCO's consolidated financial statements and
the receipt of $6.1 billion in cash from the sale of ARCO Alaska, Inc. common
stock and the pipeline and marine assets. The adjustments also reflect an
after-tax gain of $1.65 billion and the estimated income taxes payable of $1.36
billion.

     The pro forma condensed statements of income have been prepared as if the
sale of the shares and the pipeline and marine assets took place as of January
1, 1999. The pro forma condensed balance sheet has been prepared as if the sale
of the shares took place as of March 31, 2000.

     Such pro forma financial statements are not necessarily indicative of the
results of future operations, nor the results of historical operations had the
sale of ARCO Alaska, Inc. shares and the pipeline and marine assets taken place
as of the assumed dates.

                                       20
<PAGE>

            ATLANTIC RICHFIELD COMPANY AND CONSOLIDATED SUBSIDIARIES
                                   (UNAUDITED)
                     PRO FORMA CONDENSED STATEMENT OF INCOME

<TABLE>
<CAPTION>
                                                                               YEAR ENDED DECEMBER 31, 1999
                                                                         -----------------------------------------
                                                                                                       PRO FORMA
                                                                                                      AFTER GIVING
                                                                                                       EFFECT TO
(MILLIONS, EXCEPT PER SHARE AMOUNTS)                                     HISTORICAL    ADJUSTMENTS    ADJUSTMENTS
                                                                         ----------    -----------    ------------
  <S>                                                                    <C>           <C>            <C>
  Revenues
     Sales and other operating revenues..............................    $   12,501    $      (470)   $     10,651
     Other revenues..................................................           554            (15)            539
                                                                         ----------    -----------    ------------
                                                                             13,055           (485)         11,190
                                                                         ----------    -----------    ------------

  Expenses
     Trade purchases.................................................         4,893          1,359          4,872
     Operating expenses..............................................         2,386           (298)          2,088
     Selling, general and administrative expenses....................           607            (54)            553
     Depreciation, depletion and amortization........................         1,785           (363)          1,422
     Exploration expenses (including undeveloped leasehold
       amortization).................................................           386            (50)            336
     Impairment of oil and gas properties............................            14             --              14
     Taxes other than income taxes...................................           475           (239)            236
     Interest........................................................           398             (9)            389
     Loss on disposition of Algeria assets...........................           175             --             175
     Restructuring costs.............................................            20             --              20
                                                                         ----------    -----------    ------------
                                                                             11,139            346          10,105
                                                                         ----------    -----------    ------------
  Income before income taxes and minority interest...................         1,916           (831)          1,085
  Provision for taxes on income......................................          (533)           286            (247)
  Minority interest in earnings of subsidiaries......................           (38)            --             (38)
                                                                         ----------    -----------    ------------
  Income from continuing operations..................................    $    1,345    $      (545)   $        800
                                                                         ==========    ===========    ============

  Earned per Share
     Continuing operations--Basic (322.3 shares)......................   $     4.17    $     (1.69)   $       2.48
     Continuing operations--Diluted (328.8 shares)....................   $     4.09    $     (1.66)   $       2.43
</TABLE>


                                       21
<PAGE>

            ATLANTIC RICHFIELD COMPANY AND CONSOLIDATED SUBSIDIARIES
                                   (UNAUDITED)
                     PRO FORMA CONDENSED STATEMENT OF INCOME
<TABLE>
<CAPTION>
                                                                              THREE MONTHS ENDED MARCH 31, 2000
                                                                             -------------------------------------
                                                                                                      PRO FORMA
                                                                                                     AFTER GIVING
                                                                                                       EFFECT TO
  (MILLIONS, EXCEPT PER SHARE AMOUNTS)                                       HISTORICAL   ADJUSTMENTS  ADJUSTMENTS
                                                                             ---------  ------------  ------------
<S>                                                                          <C>        <C>           <C>
  Revenues                                                                   $  3,993   $      (123)  $     3,300
     Sales and other operating revenues...................................        201            (3)          198
                                                                             ---------  ------------  ------------
     Other revenues.......................................................      4,194          (126)        3,498
                                                                             ---------  ------------  ------------
  Expenses
     Trade purchases......................................................      1,685           562         1,677
     Operating expenses...................................................        600           (71)          529
     Selling, general and administrative expenses ........................        136           (11)          125
     Exploration expenses (including undeveloped leasehold amortization)..        100           (17)           83
     Depreciation, depletion and amortization.............................        484           (87)          397
     Taxes other than income taxes........................................        177           (85)           92
     Interest ............................................................        110            (3)          107
                                                                             ---------  ------------  ------------
                                                                                3,292           288         3,010
                                                                             ---------  ------------  ------------

  Income before income taxes and minority interest........................        902          (414)          488
  Provision for taxes on income...........................................       (271)          154          (117)
  Minority interest in earnings of subsidiaries...........................        (14)           --           (14)
                                                                             ---------  ------------  ------------
  Income from continuing operations.......................................   $    617   $      (260)  $       357
                                                                             =========  ============  ============

  Earned per Share
     Continuing operations--Basic (323.4 shares)..........................   $   1.91   $      (.81)  $      1.10
     Continuing operations--Diluted (329.1 shares)........................   $   1.87   $      (.79)  $      1.08
</TABLE>
- --------------

                                       22
<PAGE>

                           ATLANTIC RICHFIELD COMPANY
                                   (UNAUDITED)
                        PRO FORMA CONDENSED BALANCE SHEET
<TABLE>
<CAPTION>
                                                                                     MARCH 31, 2000
                                                                   -----------------------------------------------
                                                                                                       PRO FORMA
                                                                                                     AFTER GIVING
                                                                                                       EFFECT TO
  (MILLIONS)                                                          HISTORICAL       ADJUSTMENTS    ADJUSTMENTS
                                                                   ----------------  ---------------  ------------
<S>                                                                <C>               <C>              <C>
  ASSETS
  Cash, cash equivalents, and short-term investments............   $         1,260   $          (11)  $     1,249
  Receivable from BP Amoco......................................                              6,118         6,118
  Other accounts receivable, inventories and
     other current assets.......................................             1,990             (251)        1,739

  Investments accounted for on the equity method................             1,579               (2)        1,577
  Investments and long-term receivables.........................             1,883               --         1,883

  Net property, plant and equipment.............................            18,173           (4,951)       13,222

  Net assets of discontinued operations.........................                68               --            68
  Deferred charges and other assets.............................             1,578               (9)        1,569
                                                                   ----------------  ---------------  ------------

  Total assets..................................................   $        26,531   $          894   $    27,425
                                                                   ================  ===============  ============

  LIABILITIES AND STOCKHOLDERS' EQUITY
  Current liabilities...........................................   $         3,863   $        1,129        $4,992
  Long-term debt................................................             5,599             (266)        5,333
  Deferred income taxes.........................................             3,643             (799)        2,844
  Other deferred liabilities and credits........................             3,885             (820)        3,065
  Minority interest.............................................               309               --           309
  Stockholder's equity:
     Preference stocks..........................................                 1               --             1
     Common stock...............................................               818               --           818
     Capital in excess of par value of stock....................               918               --           918
     Retained earnings..........................................             7,476            1,650         9,126
     Treasury stock.............................................              (272)              --          (272)
     Accumulated other comprehensive income.....................               291               --           291
                                                                   ----------------  ---------------  ------------
  Total stockholders' equity....................................             9,232            1,650        10,882
                                                                   ----------------  ---------------  ------------
  Total liabilities and stockholders' equity....................   $        26,531   $          894   $    27,425
                                                                   ================  ===============  ============
</TABLE>

                                       23
<PAGE>


ITEM 6. EXHIBITS AND REPORTS ON FORM 8-K.

       (a)   Exhibits.

           2    Master Purchase and Sale Agreement, dated as of March 15,
                2000, as amended, by and among ARCO, CH-Twenty, Inc., BP
                Amoco p.l.c. and Phillips Petroleum Company.

           27   Financial Data Schedule.

       (b)   Reports on Form 8-K.

       The following Current Reports on Form 8-K were filed during the quarter
ended March 31, 2000 and through the date hereof.

   DATE OF REPORT             ITEM NO.                 FINANCIAL STATEMENTS
- ------------------       -----------------           ------------------------

May 9, 2000                    1 and 4                         None
April 25, 2000                 1 and 4                         None
April 13, 2000                    5                            None
March 28, 2000                    5                            None
March 21, 2000                    5                            None
February 9, 2000                  5                            None

                                       24
<PAGE>


                                    SIGNATURE

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

                                               ATLANTIC RICHFIELD COMPANY
                                                     (Registrant)

                                               /s/ Charles L. Hall
                                         --------------------------------------
      Dated:   May 11, 2000                        Charles L. Hall
                                                   Assistant Controller
                                                   (Duly Authorized Officer and
                                                   Principal Accounting Officer)


<PAGE>

                                                                      EXHIBIT 2




                       MASTER PURCHASE AND SALE AGREEMENT

                                  by and among

                           ATLANTIC RICHFIELD COMPANY,

                                CH-TWENTY, INC.,

                                 BP AMOCO P.L.C.

                                       and

                           PHILLIPS PETROLEUM COMPANY

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


                           Dated as of March 15, 2000

                         As Amended as of April 6, 2000

<PAGE>

<TABLE>
<CAPTION>
                                TABLE OF CONTENTS

                                                                                                      PAGE
                                                                                                      ----
<S>             <C>                                                                                    <C>
Article I       DEFINITIONS AND TERMS....................................................................2

   Section 1.1       Specific Definitions................................................................2
   Section 1.2       Other Terms........................................................................17
   Section 1.3       Other Definitional Provisions......................................................17

Article II      PURCHASE AND SALE OF THE SHARES AND CONVEYED PROPERTIES.................................17

   Section 2.1       Purchase and Sale..................................................................17
   Section 2.2       First Closing; Producing and Marine Assets Delivery and Payment....................18
   Section 2.3       Adjustments to the Initial Producing and Marine Assets
                         Purchase Price.................................................................19
   Section 2.4       Second Closing; Pipeline Assets Delivery and Payment...............................25
   Section 2.5       Adjustments to the Pipeline Assets Purchase Price..................................26
   Section 2.6       Actions Prior to First Closing.....................................................28
   Section 2.7       Preferential Rights................................................................30
   Section 2.8       Contingent Payments................................................................30

Article III     REPRESENTATIONS AND WARRANTIES OF SELLERS...............................................31

   Section 3.1       Organization and Authority.........................................................32
   Section 3.2       Binding Effect.....................................................................32
   Section 3.3       Organization, Qualification and Authority of the Companies.........................32
   Section 3.4       Ownership of Shares and LLC Interests..............................................32
   Section 3.5       Consents and Approvals.............................................................33
   Section 3.6       Non-Contravention..................................................................33
   Section 3.7       Financial Statements...............................................................34
   Section 3.8       Litigation and Claims..............................................................34
   Section 3.9       Taxes..............................................................................35
   Section 3.10      Compliance with Laws...............................................................35
   Section 3.11      Contracts..........................................................................35
   Section 3.12      Properties.........................................................................35
   Section 3.13      Absence of Changes.................................................................36
   Section 3.14      Finders' Fees......................................................................36
   Section 3.15      Indebtedness.......................................................................36
   Section 3.16      Employee Benefits..................................................................36
   Section 3.17      No Other Representations or Warranties.............................................37

                                       i
<PAGE>

Article IV      REPRESENTATIONS AND WARRANTIES OF PURCHASER.............................................37

   Section 4.1       Organization and Authority.........................................................37
   Section 4.2       Binding Effect.....................................................................37
   Section 4.3       Consents and Approvals.............................................................37
   Section 4.4       Non-Contravention..................................................................37
   Section 4.5       Finders' Fees......................................................................38
   Section 4.6       Financial Capability...............................................................38
   Section 4.7       Investigation by Purchaser.........................................................38
   Section 4.8       Purchaser Impediments..............................................................38
   Section 4.9       Securities Act.....................................................................38
   Section 4.10      No Other Representations or Warranties.............................................39

Article V       COVENANTS...............................................................................39

   Section 5.1       Access.............................................................................39
   Section 5.2       Retention of Records...............................................................40
   Section 5.3       Conduct of Business................................................................41
   Section 5.4       Filings; Other Actions; Notifications..............................................42
   Section 5.5       Tax Matters........................................................................43
   Section 5.6       Employees and Employee Benefits....................................................50
   Section 5.7       Indebtedness.......................................................................50
   Section 5.8       Further Assurances.................................................................51
   Section 5.9       Certain Transactions...............................................................51
   Section 5.10      Charter Obligations................................................................51
   Section 5.11      Sellers' Trade Names, Etc..........................................................53
   Section 5.12      Guarantee..........................................................................53
   Section 5.13      Insurance Matters..................................................................53
   Section 5.14      Long-Term Supply Contracts.........................................................54
   Section 5.15      Certain Intellectual Property......................................................55
   Section 5.16      Substitution of Guarantor..........................................................57
   Section 5.17      Transitional Services..............................................................57
   Section 5.18      Designation of Transferee..........................................................58
   Section 5.19      Preparation of Financial Statements................................................58
   Section 5.20      Order to Hold Separate and Maintain Assets.........................................58
   Section 5.21      ARCO Directors and Officers........................................................58
   Section 5.22      Marine.............................................................................59

Article VI      CONDITIONS TO CLOSING...................................................................61

   Section 6.1       Conditions to the Obligations of Purchaser and Sellers With Respect
                         to the First Closing...........................................................61
   Section 6.2       Conditions to the Obligations of Purchaser With Respect to the
                         First Closing..................................................................62

                                     ii
<PAGE>

   Section 6.3       Conditions to the Obligations of Sellers With Respect to the
                         First Closing..................................................................63
   Section 6.4       Conditions to the Obligations of Purchaser and Sellers With Respect
                         to the Second Closing..........................................................64

Article VII     CERTAIN ENVIRONMENTAL MATTERS...........................................................64

   Section 7.1       Acknowledgments....................................................................64
   Section 7.2       Assumption of Obligations..........................................................65
   Section 7.3       Retention of Obligations...........................................................65

Article VIII    SURVIVAL; INDEMNIFICATION; TITLE AND INSPECTION MATTERS.................................66

   Section 8.1       Survival...........................................................................66
   Section 8.2       Indemnification by Purchaser.......................................................67
   Section 8.3       Indemnification by ARCO............................................................68
   Section 8.4       Indemnification Procedures.........................................................69
   Section 8.5       Characterization of Indemnification Payments.......................................70
   Section 8.6       Limitations on Liability...........................................................70
   Section 8.7       Indemnification as Sole Remedy.....................................................71
   Section 8.8       Tax Indemnification................................................................72
   Section 8.9       Title Matters......................................................................72
   Section 8.10      Inspection of AMI Conveyed Properties owned by AMI.................................74

Article IX      TERMINATION.............................................................................76

   Section 9.1       Termination of Agreement...........................................................76
   Section 9.2       Effect of Termination..............................................................77
   Section 9.3       Termination of Certain Obligations.................................................77

Article X       MISCELLANEOUS...........................................................................77

   Section 10.1      Notices............................................................................77
   Section 10.2      Amendment; Waiver..................................................................79
   Section 10.3      Assignment.........................................................................79
   Section 10.4      Entire Agreement...................................................................79
   Section 10.5      Fulfillment of Obligations.........................................................79
   Section 10.6      Parties in Interest................................................................79
   Section 10.7      Public Disclosure..................................................................80
   Section 10.8      Expenses...........................................................................80
   Section 10.9      Schedules..........................................................................80
   Section 10.10     GOVERNING LAW; SUBMISSION TO JURISDICTION; SELECTION OF FORUM......................80
   Section 10.11     Counterparts.......................................................................80

                                      iii

<PAGE>

   Section 10.12     Headings...........................................................................81
   Section 10.13     Severability.......................................................................81
   Section 10.14     Extension of Performance...........................................................81
</TABLE>

                                       iv

<PAGE>

     This MASTER PURCHASE AND SALE AGREEMENT, dated as of March 15, 2000, as
amended as of April 6, 2000, by and among Atlantic Richfield Company, a Delaware
corporation ("ARCO"), CH-Twenty, Inc., a Delaware corporation ("CH-20", each of
ARCO and CH-20 being referred to herein as a "SELLER" and, together, the
"SELLERS"), BP Amoco p.l.c., an English public limited company ("BP AMOCO") and
a party to this Agreement solely in respect of Section 5.12, and Phillips
Petroleum Company, a Delaware corporation ("PURCHASER").

                              W I T N E S S E T H :

     WHEREAS, ARCO is the owner of: (i) all of the issued and outstanding shares
of (A) common stock, par value $10,000 per share ("ARCO ALASKA SHARES"), of ARCO
Alaska, Inc., a Delaware corporation ("ARCO ALASKA"), (B) common stock, par
value $10,000 per share ("ATAI SHARES"), of ARCO Transportation Alaska, Inc., a
Delaware corporation ("ATAI"), (C) common stock, par value $1,000 per share
("KUPARUK SHARES"), of Kuparuk Pipeline Company, a Delaware corporation
("KUPARUK"), (D) common stock, par value $100 per share ("OLIKTOK SHARES"), of
Oliktok Pipeline Company, a Delaware corporation ("OLIKTOK"), (E) common stock,
par value $100 per share ("ALPINE SHARES"), of Alpine Pipeline Company, a
Delaware corporation ("ALPINE"), (F) common stock, par value $10 per share
("ARCO MARINE SHARES"), of ARCO Marine, Inc., a Delaware corporation ("ARCO
MARINE") and (G) common stock, par value $.01 per share ("UTP HOLDINGS SHARES"),
of Union Texas Petroleum Holdings, Inc., a Delaware corporation ("UTP HOLDINGS")
and the indirect owner of all of the limited liability company interests ("UTA
INTERESTS") in Union Texas Alaska, LLC, a Delaware limited liability company
("UTA"), (ii) 8,000 of the issued and outstanding shares of common stock, par
value $100 per share ("CIPC SHARES"), of Cook Inlet Pipeline Company, a Delaware
corporation ("CIPC") and (iii) the Product Inventory;

     WHEREAS, CH-20 is the owner of all of the issued and outstanding shares of
common stock, par value $1 per share ("ARCO BELUGA SHARES"), of ARCO Beluga,
Inc., a Delaware corporation ("ARCO BELUGA"; each of ARCO Alaska, ATAI, Kuparuk,
Oliktok, Alpine, ARCO Marine, UTP Holdings, UTA and ARCO Beluga being referred
to herein as a "COMPANY" and, collectively, the "COMPANIES"; and the ARCO Alaska
Shares, ATAI Shares, Kuparuk Shares, Oliktok Shares, Alpine Shares, ARCO Marine
Shares, UTP Holdings Shares, CIPC Shares and ARCO Beluga Shares collectively
being referred to herein as the "SHARES");

     WHEREAS, BP Amoco, ARCO and Prairie Holdings, Inc. ("PRAIRIE") have
executed that certain Agreement and Plan of Merger, dated March 31, 1999, as
amended (the "MERGER AGREEMENT"), wherein the parties agreed, subject to certain
terms and conditions, to merge Prairie with and into ARCO (the "BP AMOCO/ARCO
MERGER");

<PAGE>

     WHEREAS, in order to facilitate the fulfillment of certain conditions to
the BP Amoco/ARCO Merger, ARCO and CH-20 desire to sell and transfer to
Purchaser the respective Shares owned by them, and Purchaser desires to purchase
the Shares on the terms and subject to the conditions set forth herein, and the
parties desire to engage in the other transactions contemplated herein;

     NOW, THEREFORE, in consideration of the mutual covenants and agreements
contained herein and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, and on the terms and subject to
the conditions set forth herein, the parties hereto agree as follows:

                                   ARTICLE I
                              DEFINITIONS AND TERMS


          Section 1.1 SPECIFIC DEFINITIONS. As used in this Agreement,
the following terms have the meanings set forth or as referenced below:

     "ADVERSE CHANGE" has the meaning set forth in Schedule 5.6, Section 5.

     "AFFILIATE" means, as applied to any Person, any other Person directly or
indirectly controlling, controlled by, or under common control with, such other
Person at the time at which the determination of affiliation is made. The term
"control" (including, with correlative meanings, the terms "controlled by" and
"under common control with"), as applied to any Person, means the possession,
direct or indirect, of the power to direct or cause the direction of the
management and policies of that Person, whether through the ownership of voting
securities or other ownership interests, by contract or otherwise.

     "AFFILIATE TRANSACTION" means any transaction between a Seller and/or any
Affiliate of Seller (other than any Company), on the one hand, and any Company,
on the other hand, excluding any transaction to which a third Person is also a
party.

     "AGREEMENT" means this Master Purchase and Sale Agreement and all Schedules
hereto, as the same may be amended or supplemented from time to time in
accordance with the terms hereof.

     "ALASKA BUSINESS" has the meaning set forth in Section 3.12.

     "ALIGNMENT AGREEMENT" means the ARCO Alaska/BP Exploration/Unocal Alignment
Agreement, Greater Kuparuk Area, dated January 1, 1997.

     "ALPINE" has the meaning set forth in the Recitals.

                                       2

<PAGE>

     "ALPINE CERTIFICATE" has the meaning set forth in Section 2.6(a)(iii).

     "ALPINE RIGHTS-OF-WAY" means the two right-of-way leases by and between the
State of Alaska and ARCO for the Alpine crude oil pipeline (ADL-415701) and the
Alpine diesel line (ADL-415932) and, in the event that the Alpine Utility
Right-of-Way is transferred from ARCO Alaska to ARCO prior to the First Closing
in accordance with Section 2.6(b)(ii), the Alpine Utility Right-of-Way.

     "ALPINE SHARES" has the meaning set forth in the Recitals.

     "ALPINE UTILITY RIGHT-OF-WAY" means the right-of-way grant by and between
the State of Alaska and ARCO Alaska for the Alpine utility pipeline
(ADL-415857).

     "AMI" means AMI Leasing Inc., a Delaware corporation.

     "AMI CONVEYED CONTRACT" means the contract more specifically identified on
Schedule 1.1(A).

     "AMI CONVEYED PROPERTIES" means the tankers more specifically identified on
Schedule 1.1(B).

     "ARCO" has the meaning set forth in the Preamble.

     "ARCO ALASKA" has the meaning set forth in the Recitals.

     "ARCO ALASKA BUSINESSES" means the business of (a) acquiring any right
or option (whether or not contingent) to bid for or to explore for, to develop
or to produce hydrocarbons in Alaska, (b) exploring for, developing or producing
hydrocarbons in Alaska or transporting or shipping hydrocarbons within or from
Alaska, (c) providing any product or service, directly or indirectly, with or
without compensation, to any person engaged in any of the activities in (a) or
(b) where such product or service is primarily used in or related to such
person's activities in Alaska or (d) supporting ARCO in any of the activities
referred to in clauses (a), (b) or (c) as those activities were conducted by
ARCO on March 15, 2000.

     "ARCO ALASKA COMPANY" means each of ARCO Alaska, ATAI, Kuparuk, Oliktok,
Alpine, ARCO Marine, ARCO Marine Spill Response Company, a Delaware corporation
and a wholly owned subsidiary of ARCO Marine, UTP Holdings and UTA.

     "ARCO ALASKA INTELLECTUAL PROPERTY" has the meaning set forth in
Section 5.15(a)(i).

     "ARCO ALASKA SHARES" has the meaning set forth in the Recitals.

                                       3

<PAGE>

     "ARCO BELUGA" has the meaning set forth in the Recitals.

     "ARCO BELUGA SHARES" has the meaning set forth in the Recitals.

     "ARCO DIRECTORS AND OFFICERS" has the meaning set forth in Section
5.21(b).

     "ARCO GEOSCIENCE AND RESERVOIR INTELLECTUAL PROPERTY" has the meaning set
forth in Section 5.15(c).

     "ARCO INTELLECTUAL PROPERTY" has the meaning set forth in Section
5.15(b).

     "ARCO MARINE" has the meaning set forth in the Recitals.

     "ARCO MARINE SHARES" has the meaning set forth in the Recitals.

     "ARCO MARINE TRANSFER DATE" means the date on which the ARCO Marine
Shares are delivered to Purchaser in accordance with Section 2.6(b)(vi).

     "ARCO OIL AND GAS LEASE" means each of the 17 lease agreements relating
to the Producing Properties that is identified on Schedule 1.1(C).

     "ARCO PATENTS" has the meaning set forth in Section 5.15(a)(ii).

     "ARCO PRODUCTS TIME CHARTERS" has the meaning set forth in Section
5.22(c).

     "ARCO PROPRIETARY IP" has the meaning set forth in Section 5.15(a).

     "ARCO SEISMIC DATA" has the meaning set forth in Section 5.15(a)(iii).

     "ARCO SEVERANCE PLANS" has the meaning set forth in Schedule 5.6,
Section 7.

     "ARCO TRADER" means the tanker more specifically identified on Schedule
1.1(D).

     "AREA PARTICIPATION PERCENTAGE" means, with respect to each Field, the
sum of the percentages obtained by multiplying the percentage of the working
interest owned by Seller and its Subsidiaries in each tract included within the
Field by the tract participation of such tract for the Field.

     "ASO" has the meaning set forth in Section 5.13.

     "ATAI" has the meaning set forth in the Recitals.

     "ATAI SHARES" has the meaning set forth in the Recitals.

     "ATC" has the meaning set forth in Section 5.22(b)(i).

                                       4

<PAGE>

     "BANKRUPTCY AND EQUITY EXCEPTION" has the meaning set forth in Section 3.2.

     "BAREBOAT CHARTERS" has the meaning set forth in Section 5.22(b)(i).

     "BONDS" has the meaning set forth in Section 5.7(b).

     "BOOKS AND RECORDS" means all books, ledgers, files, reports, customer
lists, plans and operating records of, or maintained by, or pertaining to, any
of the Companies in whatever form stored or retained.

     "BP AMOCO" has the meaning set forth in the Preamble.

     "BP AMOCO/ARCO MERGER" has the meaning set forth in the Recitals.

     "BP EXPLORATION" means BP Exploration (Alaska), Inc., a Delaware
corporation.

     "BUSINESS DAY" means any day other than a Saturday, a Sunday or a day
on which banks in the State of New York are authorized or obligated by law or
executive order to close.

     "CHARTER" means the Charter for Development of the Alaskan North Slope
entered into as of December 2, 1999, among the State of Alaska, ARCO Alaska, BP
Exploration and BP Amoco, providing for, among other things, the divestiture of
certain oil and gas properties and other related interests on the North Slope of
Alaska, as supplemented by the Addendum to the Charter for the Development of
the Alaskan North Slope, dated March 15, 1999.

     "CHOSEN COURTS" has the meaning set forth in Section 10.10.

     "CH-20" has the meaning set forth in the Preamble.

     "CIPC" has the meaning set forth in the Recitals.

     "CIPC SHARES" has the meaning set forth in the Recitals.

     "CLAIM NOTICE" has the meaning set forth in Section 8.4.

     "CLOSING" has the meaning set forth in Section 2.4(a).

     "CLOSING DATE" means either the First Closing Date, the Second Closing Date
or the ARCO Marine Transfer Date, as the context requires.

     "CLOSING MARINE FINANCIAL STATEMENTS" has the meaning set forth in
Section 2.3(a).

                                       5

<PAGE>

     "CLOSING MARINE SCHEDULE OF SETTLEMENTS" has the meaning set forth in
Section 2.3(a).

     "CLOSING PIPELINE FINANCIAL STATEMENTS" has the meaning set forth in
Section 2.5(a).

     "CLOSING PIPELINE SCHEDULE OF SETTLEMENTS" has the meaning set forth in
Section 2.5(a).

     "CLOSING PRODUCING FINANCIAL STATEMENTS" has the meaning set forth in
Section 2.3(a).

     "CLOSING PRODUCING SCHEDULE OF SETTLEMENTS" has the meaning set forth
in Section 2.3(a).

     "CODE" means the Internal Revenue Code of 1986, as amended.

     "COMPANY" and "COMPANIES" have the meanings set forth in the Recitals.

     "COMPETITION LAWS" means any Law designed or intended to prohibit, restrict
or regulate actions or states of affairs having the purpose or effect of
monopolization, restraint or distortion of competition.

     "CONFIDENTIAL INFORMATION" has the meaning set forth in Section 5.1(b).

     "CONFIDENTIALITY AGREEMENT" means the Confidentiality Agreement, executed
in November 1999, by and between ARCO et al. and Purchaser (or its Affiliate),
as amended.

     "CONSENT AGREEMENT" means the Agreement Containing Consent Orders by and
among BP Amoco, ARCO and counsel for the FTC that includes the Provisional
Consent Order.

     "CONTRACTS" means any agreements, contracts, leases, purchase orders,
arrangements, commitments or licenses.

     "CONVEYED PROPERTIES" means the Alpine Rights-of-Way, the AMI Conveyed
Properties and the AMI Conveyed Contract.

     "CPA FIRM" has the meaning set forth in Section 2.3(c).

     "CUTOFF DATE" has the meaning set forth in Section 2.8(e).

     "DEDUCTIBLE" has the meaning set forth in Section 8.6(a).

                                       6

<PAGE>

     "DISCLOSURE SCHEDULE" has the meaning set forth in Article III.

     "EFFECTIVE DATE" means January 1, 2000.

     "EFFECTIVE TIME" means January 1, 2000 at 12:01 a.m. Anchorage time.

     "EMPLOYEE PLANS" has the meaning set forth in Section 3.16.

     "ENCUMBRANCE" means any lien, charge, pledge, security interest,
restriction or other encumbrance of any kind.

     "ENVIRONMENTAL LAW" means any Law relating to the protection of the
environment or the use, storage, recycling, treatment, handling, release or
disposal of Hazardous Substances.

     "ERISA" has the meaning set forth in Section 3.16.

     "ESTIMATED PRODUCT INVENTORY PURCHASE PRICE" means $170,213,643.

     "EXCHANGE ACT" means the United States Securities Exchange Act of 1934, as
amended.

     "EXPLORATION LEASES" mean the oil and gas leases located, as of the date of
this Agreement, in the land department files of ARCO Alaska wherein ARCO Alaska
is named as an original lessee or assignee of such oil and gas leases, PROVIDED,
HOWEVER, that the term "Exploration Leases" shall not include (a) oil and gas
leases which are included (wholly or partially) in a producing unit or the
Greater Kuparuk Area as such term is defined in Greater Kuparuk Joint Operating
Agreement, Pre-Development, dated March 1, 1997, as amended, (b) oil and gas
leases that expire, lapse or terminate or have expired, lapsed or terminated
under their own terms, or (c) oil and gas leases which were released by ARCO
Alaska prior to the Effective Time.

     "FIELD" means each participating area or accumulation described in Schedule
8.9 of the Disclosure Schedules.

     "FINAL CLOSING MARINE SCHEDULE OF SETTLEMENTS" has the meaning set forth in
Section 2.3(d).

     "FINAL CLOSING PIPELINE SCHEDULE OF SETTLEMENTS" has the meaning set forth
in Section 2.5(b).

     "FINAL CLOSING PRODUCING SCHEDULE OF SETTLEMENTS" has the meaning set
forth in Section 2.3(d).

                                       7

<PAGE>

     "FINAL PRODUCT INVENTORY PURCHASE PRICE" means the sum of Kuparuk Line Fill
(in barrels) multiplied by (Kuparuk Royalty Price plus $0.10) plus TAPS Line
Fill (in barrels) multiplied by (TAPS Royalty Price plus $1.44) plus Tanker
Cargo (in barrels) multiplied by (TAPS Royalty Price plus $3.525).

     "FIRST CLOSING" has the meaning set forth in Section 2.2(a).

     "FIRST CLOSING DATE" has the meaning set forth in Section 2.2(a).

     "FIRST CLOSING SCHEDULE OF SETTLEMENTS" has the meaning set forth in
Section 2.3(a).

     "FIRST CLOSING FINANCIAL STATEMENTS" has the meaning set forth in Section
2.3(a).

     "FTC" means the Federal Trade Commission.

     "GAAP" means United States generally accepted accounting principles.

     "GOVERNMENTAL AUTHORIZATIONS" means all licenses, permits, certificates and
other authorizations and approvals of or issued by any Governmental Entity
required (i) with respect to any party hereto, to perform their respective
obligations hereunder and (ii) with respect to any of the Companies, to carry on
its business substantially as currently conducted under applicable Law.

     "GOVERNMENTAL ENTITY" means any foreign, federal, state, local, municipal,
county, borough, or other governmental, quasi-governmental, administrative or
regulatory authority, body, agency, court, tribunal, commission or other similar
entity (including any branch, department or official thereof).

     "GUARANTEES" has the meaning set forth in Section 5.7(b).

     "GOVERNMENT ANTITRUST ENTITY" has the meaning set forth in Section 5.4(d).

     "HAZARDOUS SUBSTANCES" means any substance listed, defined, designated
or classified as hazardous, toxic or radioactive under any applicable
Environmental Law, including petroleum and any derivative or by-product thereof.

     "HSR ACT" means the Hart-Scott-Rodino Antitrust Improvements Act of
1976, as amended.

     "INDEMNIFIED PARTIES" has the meaning set forth in Section 8.3.

     "INDEMNIFYING PARTY" has the meaning set forth in Section 8.4.

                                       8

<PAGE>

     "INITIAL PIPELINE ASSETS PURCHASE PRICE" has the meaning set forth in
Section 2.1.

     "INITIAL PRODUCING AND MARINE ASSETS PURCHASE PRICE" has the meaning
set forth in Section 2.1.

     "KEY PERSONNEL" has the meaning set forth in Schedule 5.6, Section 8.

     "KNOWLEDGE OF SELLERS" or "SELLERS' KNOWLEDGE" means the actual knowledge
of those persons set forth on Schedule 1.1(E) of the Disclosure Schedule.

     "KUPARUK" has the meaning set forth in the Recitals.

     "KUPARUK LINE FILL" means the barrels of Alaska North Slope oil and
natural gas liquids owned by ARCO, determined as of 11:59 P.M. (Alaska Time) on
the First Closing Date, that are contained between the inlet of Kuparuk's
pipeline system and the inlet of TAPS Pump Station No. 1.

     "KUPARUK ROYALTY PRICE" means the weighted average royalty price per
barrel paid by ARCO Alaska for production attributable to the Kuparuk River Unit
for the production month in which the First Closing occurs, as initially
published in the Monthly Royalty Report by the State of Alaska.

     "KUPARUK SHARES" has the meaning set forth in the Recitals.

     "LAW" means any foreign, federal, state or local law, statute, ordinance,
directive, rule, regulation, order, judgment, decree, injunction or other
legally binding obligation imposed by a Governmental Entity.

     "LONG-TERM SUPPLY CONTRACT" has the meaning set forth in Section 5.14.

     "LOSSES" has the meaning set forth in Section 8.2.

     "MARINE COMPANIES" means, collectively, AMI and ARCO Marine.

     "MARINE EMPLOYEES" shall mean current and former employees of ARCO
Marine for whom Sellers retain any liability pursuant to Schedule 5.6, Section
13.

     "MARINE FINANCIAL STATEMENTS" has the meaning set forth in Section 3.7.

     "MATERIAL ADVERSE EFFECT" shall mean a material adverse effect on the
financial condition, business, assets or results of operations of the Companies
taken as a whole, but shall exclude any effect resulting from any change after
the date of this Agreement (i) in Law or interpretations thereof, (ii) in
economic or business conditions generally, (iii) in the

                                       9

<PAGE>

oil and gas industry generally or (iv) arising out of the announcement of this
Agreement or the consummation of the transactions contemplated hereby.

     "MATERIAL CONTRACT" means any Contract to which any Company is a party that
would be considered a "Material Contract" of the Companies under Item 601(b) of
Regulation S-K promulgated under the Securities Act and the Exchange Act if all
of the Companies, taken together, constituted a reporting company under the
Exchange Act.

     "MERGER AGREEMENT" has the meaning set forth in the Recitals.

     "NECESSARY CONSENT" has the meaning set forth in Section 2.4(c).

     "NET REVENUE INTEREST BARRELS" has the meaning set forth in Section
2.8(c).

     "NON-UNIT RESERVE PITS" means the reserve pit sites associated with the
Producing Properties other than the Unit Reserve Pits.

     "NORM" means naturally occurring radioactive materials.

     "NOTICE PERIOD" has the meaning set forth in Section 8.4.

     "OLIKTOK" has the meaning set forth in the Recitals.

     "OLIKTOK SHARES" has the meaning set forth in the Recitals.

     "ORDER" has the meaning set forth in Section 5.4(d).

     "PERMITTED ENCUMBRANCES" means any and all of the following:

     (a)  the obligations of ARCO Alaska under the Alignment Agreement;

     (b)  any consents to assignment required under Contracts set forth on
Schedule 3.6;

     (c)  preferential rights to purchase affecting any of the Shares or the
Conveyed Properties described in Section 2.7;

     (d)  rights to consent by, required notices to, and filings with any
Governmental Entity associated with the conveyance of the Shares or Conveyed
Properties;

     (e)  rights reserved to or vested by Law in a Governmental Entity having
jurisdiction to control or regulate any of the Companies or Properties in any
manner whatsoever, and all Laws of such Governmental Entities;

                                       10

<PAGE>

     (f) obligations and restrictions to which any Company or its Properties are
subject under the Charter, the Provisional Consent Order or the State Consent
Order;

     (g)  the terms and conditions of the unitizations, communitizations,
poolings, agreements, instruments, licenses and permits affecting the
Properties;

     (h)  liens for taxes or assessments not yet delinquent or, if delinquent,
are being contested by a Seller or a Company in good faith in the ordinary
course of business;

     (i)  liens of operators relating to obligations not yet delinquent or, if
delinquent, are being contested by a Seller or a Company in good faith in the
ordinary course of business; and

     (j)  the matters referenced on Schedule 3.8(a) and Schedule 3.8(b).

     "PERSON" means an individual, a corporation, a partnership, an
association, a limited liability company, a trust or other entity or
organization, including any Governmental Entity.

     "PERSONNEL" has the meaning set forth in Schedule 5.6, Section 1.

     "PIPELINE ADJUSTMENT PAYMENT" has the meaning set forth in Section
2.5(c).

     "PIPELINE ASSETS" means, collectively, the ATAI Shares, the Kuparuk Shares,
the Oliktok Shares, the Alpine Shares, the CIPC Shares, the AMI Conveyed
Contract and the Alpine Rights-of-Way.

     "PIPELINE ASSETS PURCHASE PRICE" has the meaning set forth in Section 2.1.

     "PIPELINE COMPANIES" means, collectively, ATAI, Kuparuk, Oliktok, Alpine
and CIPC.

     "PIPELINE ESTIMATED ADJUSTMENT" has the meaning set forth in Section
2.4(b)(iii).

     "PIPELINE FINANCIAL STATEMENTS" has the meaning set forth in Section
3.7.

     "POST-CLOSING PERIOD" means (i) with respect to the Producing Companies,
UTP Holdings, the Product Inventory and the AMI Conveyed Properties, each
taxable period that starts after the First Closing Date and, in the case of a
taxable period beginning before and ending after the First Closing Date, the
portion of such period beginning after the First Closing Date, (ii) with respect
to ARCO Marine, each taxable period that starts after the ARCO Marine Transfer
Date and, in the case of a taxable period beginning before and ending after the
ARCO Marine Transfer Date, the portion of such period beginning after the ARCO
Marine Transfer Date, (iii) with respect to the Pipeline Companies, CIPC and

                                       11

<PAGE>

the Alpine Rights-of-Way, each taxable period that starts after the Second
Closing Date and, in the case of a taxable period beginning before and ending
after the Second Closing Date, the portion of such period beginning after the
Second Closing Date and (iv) with respect to the AMI Conveyed Contract, each
taxable period that starts after the applicable Closing Date, and, in the case
of a taxable period beginning before and ending after such Closing Date, the
portion of such period beginning after such Closing Date.

     "POST-EFFECTIVE TIME PERIOD" means each taxable period that begins after
December 31, 1999 and, in the case of a taxable period beginning before and
ending after December 31, 1999, the portion of such period beginning after
December 31, 1999.

     "PRAIRIE" has the meaning set forth in the Recitals.

     "PRE-CLOSING PERIOD" means (i) with respect to the Producing Companies,
UTP Holdings, ARCO Marine, the Product Inventory and the AMI Conveyed
Properties, each taxable period that ends on or before the First Closing Date
and, in the case of a taxable period beginning before and ending after the First
Closing Date, the portion of such period through the end of the First Closing
Date, (ii) with respect to ARCO Marine, each taxable period that ends on or
before the ARCO Marine Transfer Date and, in the case of a taxable period
beginning before and ending after the ARCO Marine Transfer Date, the portion of
such period through the end of ARCO Marine Transfer Date, (iii) with respect to
the Pipeline Companies, CIPC and the Alpine Rights-of-Way, each taxable period
that ends on or before the Second Closing Date and, in the case of a taxable
period beginning before and ending after the Second Closing Date, the portion of
such period through the end of the Second Closing Date and (iv) with respect to
the AMI Conveyed Contract, each taxable period that ends on or before the
applicable Closing Date, and, in the case of a taxable period beginning before
and ending after such Closing Date, the portion of such period through the end
of such Closing Date.

     "PRE-EFFECTIVE TIME PERIOD" means each taxable period that ends on or
before December 31, 1999 and, in the case of a taxable period beginning before
and ending after December 31, 1999, the portion of such period through the end
of December 31, 1999.

     "PREFERENTIAL RIGHT" has the meaning set forth in Section 2.7.

     "PROCESS SAFETY MANAGEMENT" means all processes and activities required
to comply with Process Safety Management of Highly Hazardous Chemicals;
Explosives and Blasting Agents (29 U.S. Code of Federal Regulations ss. 1910),
as amended from time to time.

     "PRODUCING AND MARINE ADJUSTMENT PAYMENT" has the meaning set forth in
Section 2.3(e).

                                       12

<PAGE>

     "PRODUCING AND MARINE ASSETS" means, collectively, the ARCO Alaska Shares,
the UTP Holdings Shares, the ARCO Beluga Shares, the ARCO Marine Shares, the AMI
Conveyed Properties and the Product Inventory.

     "PRODUCING AND MARINE ASSETS PURCHASE PRICE" has the meaning set forth in
Section 2.1.

     "PRODUCING AND MARINE ESTIMATED ADJUSTMENT" has the meaning set forth in
Section 2.2(b)(vi).

     "PRODUCING COMPANIES" means, collectively, ARCO Alaska, UTA and ARCO
Beluga.

     "PRODUCING FINANCIAL STATEMENTS" has the meaning set forth in Section 3.7.

     "PRODUCING PROPERTIES" means, with respect to ARCO Alaska, UTA and ARCO
Beluga, all oil and gas leasehold interests constituting part of the Properties
of such Company and all property (whether real, personal or mixed) relating to,
situated upon, used or held for use by such Company in connection with the
ownership, operation, maintenance or repair of such leasehold interests.

     "PRODUCT INVENTORY" means the Kuparuk Line Fill, the TAPS Line Fill and the
Tanker Cargo.

     "PRODUCT INVENTORY PURCHASE PRICE ADJUSTMENT" means the Final Product
Inventory Purchase Price minus the Estimated Product Inventory Purchase Price.

     "PROPERTIES" means (i) with respect to each Company, all rights and
interests of any kind held by such Company in and to any property, whether real,
personal, mixed, contractual or otherwise, (ii) with respect to ARCO, all rights
and interests of any kind held by ARCO in and to the Alpine Rights-of-Way; (iii)
with respect to AMI, all rights and interests of any kind held by AMI in and to
the AMI Conveyed Properties and the AMI Conveyed Contract; and (iv) with respect
to ARCO, all rights and interests of ARCO in and to the Product Inventory.

     "PROVISIONAL CONSENT ORDER" means the Decree and Order of the FTC in
the matter of BP Amoco and ARCO prior to the entry of a final order in respect
thereof.

     "PURCHASE PRICE" has the meaning set forth in Section 2.1.

     "PURCHASER" has the meaning set forth in the Preamble.

                                       13

<PAGE>

     "PURCHASER DEFINED CONTRIBUTION PLAN" has the meaning set forth in Schedule
5.6, Section 3.

     "PURCHASER INDEMNIFIED PARTIES" has the meaning set forth in Section
8.3.

     "PURCHASER PENSION PLANS" has the meaning set forth in Schedule 5.6,
Section 2.

     "PURCHASER SAVINGS PLAN" has the meaning set forth in Schedule 5.6,
Section 4.

     "PURCHASER'S OBJECTION" has the meaning set forth in Section 2.3(b).

     "PURCHASER TAX INDEMNITEE" means the Purchaser and its Subsidiaries and
Affiliates (including each Company after the Closing Date applicable to such
Company).

     "RCA" has the meaning set forth in Section 2.6(a)(iii).

     "REQUIRED GOVERNMENTAL CONSENTS" means the reports, filings, registrations,
notices, consents, approvals, waivers, and authorizations referred to in Section
3.5 (including Schedule 3.5 of the Disclosure Schedule) and Section 4.3.

     "SECOND CLOSING" has the meaning set forth in Section 2.4(a).

     "SECOND CLOSING DATE" has the meaning set forth in Section 2.4(a).

     "SECTION 338(H)(10) ELECTION" has the meaning set forth in Section
5.5(f)(i).

     "SECURITIES ACT" means the United States Securities Act of 1933, as
amended.

     "SELLER" and "SELLERS" have the meaning set forth in the Preamble.

     "SELLER INDEMNIFIED PARTIES" has the meaning set forth in Section 8.2.

     "SELLER TAX INDEMNITEE" means Sellers and their Subsidiaries and
Affiliates, other than the Companies.

     "SETTLEMENTS" has the meaning set forth in Section 2.3(a).

     "SHARES" has the meaning set forth in the Recitals.

     "SSP" has the meaning set forth in Section 2.8(a).

     "STATE CONSENT ORDER" means the Consent Decree and Final Judgment in
the matter of STATE OF CALIFORNIA, STATE OF OREGON AND STATE OF WASHINGTON v.
ATLANTIC RICHFIELD COMPANY AND BP AMOCO P.L.C.

                                       14

<PAGE>

     "SUBSIDIARY" means with respect to any Person, any corporation or other
entity of which such Person has, directly or indirectly, ownership of securities
or other interests having the power to elect a majority of such corporation's
Board of Directors (or similar governing body), or otherwise having the power to
direct the business and policies of that corporation.

     "TANKER CARGO" means the barrels of Alaska North Slope oil and natural gas
liquids owned by ARCO, determined as of 11:59 P.M. (Alaska Time) on the First
Closing Date, that are contained on board any tanker that on-loaded its cargo at
Valdez and has not begun off-loading such cargo.

     "TAPS" means the Trans Alaska Pipeline System.

     "TAPS LINE FILL" means the barrels of Alaska North Slope oil and natural
gas liquids owned by ARCO, determined as of the 11:59 P.M. (Alaska Time) on the
First Closing Date based upon the Alyeska Pipeline Service Company Owner Data
Reporting System Inventory By Carrier/Owner RPT NO. ODR - 1 and provided by the
applicable carriers, that are contained between the inlet of TAPS Pump Station
No. 1 and the outlet of the Valdez terminal.

     "TAPS ROYALTY PRICE" means the weighted average royalty price per barrel,
calculated excluding gas products and natural gas liquids injected at Kuparuk
River Unit paid by ARCO Alaska for the production month in which the First
Closing occurs, as initially published in the Monthly Royalty Report by the
State of Alaska.

     "TAXES" shall mean all federal, state, local or foreign income, gross
receipts, windfall profits, value added, severance, property, production, sales,
use, license, excise, franchise, employment, withholding or similar taxes
together with any interest, additions or penalties with respect thereto and any
interest in respect of such additions or penalties.

     "TAX INDEMNITEE" means either a Purchaser Tax Indemnitee or a Seller
Tax Indemnitee.

     "TAX PACKAGE" has the meaning set forth in Section 5.5(c).

     "TAX PROCEEDING" has the meaning set forth in Section 5.5(a)(viii).

     "TAX RESERVES" means amounts payable, accrued liabilities or other amounts
owing in respect of Taxes attributable to the operations of any Company.

     "TAX RETURNS" means all reports and returns required to be filed with
respect to Taxes.

                                       15

<PAGE>

     "THIRD PARTY CLAIM NOTICE" has the meaning set forth in Section 8.4.

     "THIRD PARTY CLAIMS" means any and all claims, demands, suits, causes of
action, losses, damages, liabilities, fines, penalties and costs (including,
without limitation, attorneys' fees and costs of litigation), whether known or
unknown, that are brought by or owed to a "third party". For the purpose of this
definition, the term "THIRD PARTY" shall mean any Person other than the parties
hereto; PROVIDED that a claim, demand, suit or cause of action by an officer,
director, employee or Affiliate of a party against that Party shall not be a
claim, demand, suit or cause of action brought by or owed to a "third party".

     "THIRD PARTY INTELLECTUAL PROPERTY" has the meaning set forth in Section
5.15(e).

     "TRANSITION DATE" has the meaning set forth in Schedule 5.6, Section
12.

     "UNISTAR" means Unistar, Inc., a Delaware corporation.

     "UNIT RESERVE PITS" means the reserve pit sites associated with the
Producing Properties that are subject to that certain Stipulation And Final
Consent Judgment, dated May 3, 1993, entered in NATURAL RESOURCES DEFENSE
COUNCIL INC. v. ARCO ALASKA, INC., No. A88-287 CIV (D. Alaska), as amended, and
other reserve pits associated with currently active oil and gas production units
in which any Company has a unit interest.

     "UTA" has the meaning set forth in the Recitals.

     "UTA INTERESTS" has the meaning set forth in the Recitals.

     "UTP ENERGY" means Union Texas Petroleum Energy Corporation, a Delaware
corporation.

     "UTP HOLDINGS" has the meaning set forth in the Recitals.

     "UTP HOLDINGS SHARES" has the meaning set forth in the Recitals.

     "VALUE" means, with respect to each Field, the specified amount allocated
in Schedule 8.9 of the Disclosure Schedule to the Area Participation Percentage
in such Field.

     "WARN OBLIGATIONS" has the meaning set forth in Schedule 5.6, Section 9.

     "WTI PRICE" has the meaning set forth in Section 2.8(c).

     "YEAR-END FINANCIAL STATEMENTS" has the meaning set forth in Section 3.7.

                                       16

<PAGE>

          Section 1.2 OTHER TERMS. Other terms may be defined elsewhere in the
text of this Agreement or the Schedules hereto and, unless otherwise indicated,
have such meanings throughout this Agreement.

          Section 1.3 OTHER DEFINITIONAL PROVISIONS. (a) The words "hereof",
"herein", and "hereunder" and words of similar import, when used in this
Agreement, refer to this Agreement as a whole and not to any particular
provision of this Agreement.

          (b) Terms defined in the singular have a comparable meaning when used
in the plural, and vice versa.

          (c) Wherever the word "include," "includes," or "including" is used
in this Agreement, it shall be deemed to be followed by the words "without
limitation."

          (d) This Agreement shall be deemed to have been drafted by each party
hereto and shall not be construed against any party as the principal
draftsperson hereof.

                                   ARTICLE II
             PURCHASE AND SALE OF THE SHARES AND CONVEYED PROPERTIES

          Section 2.1 PURCHASE AND SALE.  On the terms and subject to the
conditions set forth herein:

          (a) ARCO agrees to sell, transfer, assign, convey and deliver to
Purchaser the ARCO Alaska Shares, the ATAI Shares, the Kuparuk Shares, the
Oliktok Shares, the Alpine Shares, the ARCO Marine Shares, the UTP Holdings
Shares, the CIPC Shares and the Alpine Rights-of-Way;

          (b) CH-20 agrees to sell, transfer, assign, convey and deliver to
Purchaser the ARCO Beluga Shares;

          (c)  ARCO agrees to cause AMI to sell, transfer, assign, convey and
deliver to Purchaser the AMI Conveyed Properties and the AMI Conveyed Contract;
and

          (d)  ARCO agrees to sell, transfer, assign, convey and deliver to
Purchaser the Product Inventory;

and Purchaser agrees to purchase and accept from Sellers and AMI, all of such
Shares, Conveyed Properties and Product Inventory, for an aggregate purchase
price (the "PURCHASE PRICE") consisting of (i) for the Producing and Marine
Assets, $5,724,213,643 (the "INITIAL PRODUCING AND MARINE ASSETS PURCHASE
PRICE"), subject to adjustment as provided in Sections 2.3 and 2.8(e) (as so
adjusted, the "PRODUCING AND MARINE ASSETS PURCHASE PRICE"), plus, as additional
consideration for ARCO Alaska and UTP Holdings,

                                       17

<PAGE>

such SSPs as are payable in respect of production occurring after the Cutoff
Date pursuant to Section 2.8 and (ii) for the Pipeline Assets, $921,000,000,
less the aggregate principal amount of Bonds outstanding as of the close of
business on the day prior to the Second Closing Date (the "INITIAL PIPELINE
ASSETS PURCHASE PRICE"), less any reduction required pursuant to Section 2.7 and
subject to adjustment as provided in Section 2.5 (as so reduced or adjusted, the
"PIPELINE ASSETS PURCHASE PRICE").

          Section 2.2 FIRST CLOSING; PRODUCING AND MARINE ASSETS DELIVERY
AND PAYMENT.

          (a)  The consummation of the purchase and sale of the Producing and
Marine Assets other than the ARCO Marine Shares (the delivery of which to
Purchaser shall be effected in accordance with Section 2.6(b)(vi)) (the "FIRST
CLOSING") shall take place at the offices of Sullivan & Cromwell, 125 Broad
Street, New York, New York at 10:00 A.M., New York City time, on the later of
(i) the third Business Day following satisfaction or waiver of the conditions
set forth in Sections 6.1, 6.2 and 6.3 of this Agreement (other than those
conditions that by their terms are to be satisfied at the First Closing, but
subject to the satisfaction or waiver at or prior to the First Closing of all
such conditions) and (ii) the tenth calendar day following the consummation of
the BP Amoco/ARCO Merger, or at such other time and place as the parties hereto
may mutually agree, but in no event shall occur before April 3, 2000. The date
and time at which the First Closing occurs is sometimes referred to herein as
the "FIRST CLOSING DATE".

          (b) At the First Closing:

          (i) ARCO shall deliver to Purchaser certificates evidencing the ARCO
     Alaska Shares and the UTP Holdings Shares, each duly endorsed in blank
     or accompanied by stock powers duly executed in blank, in proper form for
     transfer and with any requisite stock transfer tax stamps properly affixed
     thereto;

          (ii) CH-20 shall deliver to Purchaser a certificate or
     certificatesevidencing the ARCO Beluga Shares, duly endorsed in blank or
     accompanied by stock powers duly executed in blank, in proper form for
     transfer and with any requisite stock transfer tax stamps properly affixed
     thereto;

          (iii) ARCO shall cause AMI to deliver to Purchaser an instrument of
     sale and assignment, in a form reasonably acceptable to Purchaser, for the
     AMI Conveyed Properties, the deliveries of which to Purchaser shall be
     subject to the timing for such deliveries agreed between the parties, as
     specified in such instrument;

                                       18

<PAGE>
          (iv) ARCO shall deliver or cause its Subsidiaries to deliver to
     Purchaser a bill of sale, in a form reasonably acceptable to Purchaser, for
     the Product Inventory;

          (v) ARCO shall deliver or cause to be delivered to Purchaser (A) all
     documents or other media constituting ARCO Seismic Data and (B) an
     instrument of sale and assignment, in a form reasonably acceptable to
     Purchaser, for the ARCO Patents, in each case to be transferred to
     Purchaser in accordance with Section 5.15; and

          (vi) Purchaser shall pay to Sellers an amount equal to the sum of (A)
     the Initial Producing and Marine Assets Purchase Price (B) an estimate
     (expressed as a positive or a negative amount), prepared by Sellers and
     delivered to Purchaser at least three Business Days prior to the First
     Closing Date, of any adjustment to the Initial Producing and Marine Assets
     Purchase Price that will be required in accordance with Section 2.3 (a)
     through (e) (the "PRODUCING AND MARINE ESTIMATED ADJUSTMENT") and (C) such
     SSPs as are payable in respect of production occurring from the Effective
     Time to and including the Cutoff Date pursuant to Section 2.8(e), by wire
     transfer of immediately available funds to an account or accounts
     designated in writing not less than two Business Days prior to the First
     Closing by Sellers to Purchaser. The Initial Producing and Marine Assets
     Purchase Price shall be allocated among ARCO, CH-20 and AMI as set forth on
     Schedule 2.2(b) of the Disclosure Schedule, subject to such adjustments
     thereto as may be required by any adjustments to the Initial Producing and
     Marine Assets Purchase Price in accordance with Section 2.3, which
     adjustments shall be allocated among ARCO, CH-20 and AMI in the manner
     agreed by Sellers and Purchaser. The parties agree that the foregoing
     allocation and those set forth in Section 2.8(f) shall be binding on the
     Sellers and Purchaser and their respective Affiliates and shall be used by
     them for all Tax reporting.

          Section 2.3  ADJUSTMENTS TO THE INITIAL PRODUCING AND MARINE ASSETS
PURCHASE PRICE.

          (a) Within 120 days following the First Closing Date, Sellers shall
prepare and deliver to Purchaser a schedule of Settlements and special purpose
audited financial statements (including a balance sheet, income statement and
statement of cash flows) for the Producing Companies for the period beginning as
of the Effective Date and ending at the close of business on the First Closing
Date or, in the case of such balance sheet, as at the close of business on the
First Closing Date (a "CLOSING PRODUCING SCHEDULE OF SETTLEMENTS" and "CLOSING
PRODUCING FINANCIAL STATEMENTS," respectively) and a schedule of Settlements and
special purpose audited financial statements (including a balance sheet, income
statement and statement of cash flows) for the Marine Companies for the same
period and as at the same date, except that with respect to ARCO Marine,

                                       19

<PAGE>

the operations, activities, transactions and accounts will be included only
through the ARCO Marine Transfer Date (a "CLOSING MARINE SCHEDULE OF
SETTLEMENTS" and "CLOSING MARINE FINANCIAL STATEMENTS," respectively). The
Closing Producing Schedule of Settlements and the Closing Marine Schedule of
Settlements are referred to herein as the "FIRST CLOSING SCHEDULES OF
SETTLEMENTS" and the Closing Producing Financial Statements and the Closing
Marine Financial Statements are referred to herein as the "FIRST CLOSING
FINANCIAL STATEMENTS". Each of the Closing Producing Financial Statements and
the Closing Marine Financial Statements will be prepared in accordance with
GAAP, applied in a manner consistent with the accounting principles and
methodology used in preparation of the Producing Financial Statements and the
Marine Financial Statements, respectively. Each First Closing Schedule of
Settlements shall include a line item for "Settlements" for the period covered
thereby, and shall be prepared in accordance with the procedures set forth in
this Section 2.3(a). Each First Closing Schedule of Settlements shall be
accompanied by a report thereon of Ernst & Young LLP that the Settlements have
been determined in accordance with this Section 2.3(a). Purchaser shall provide
Sellers and their accountants full access to the books and records, any other
information, including working papers of its accountants, and to any employees,
to the extent necessary for Sellers to prepare the First Closing Schedules of
Settlements and the First Closing Financial Statements to be delivered by
Sellers. For purposes of this Article II, the term "SETTLEMENTS" means, with
respect to the applicable period, the net cash withdrawn from or contributed to
the Producing Companies, the Marine Companies or the Pipeline Companies, as
applicable, by (i) ARCO, (ii) any Affiliate of ARCO that is not a Company or
(iii) UTP Holdings, including provision for payment of any receivables or
payables with ARCO or any Affiliate of ARCO in accordance with past practice.
Generally consistent, except as modified by clauses (2), (3), (4), (6) and (9)
below, with the "Settlements with ARCO" line on the cash flow statements
included in the Year-End Financial Statements described in Section 3.7,
Settlements will be determined by the following methodology, which shall
constitute a First Closing Schedule of Settlements, or, as applied pursuant to
Section 2.5(a), the Closing Pipeline Schedule of Settlements:

          (1) The base amount shall be net income (loss) before income taxes*;

          (2) Add back any charges* from (A) ARCO, (B) any Affiliate of ARCO
     that is not a Company or (C) UTP Holdings for employee benefit costs or
     corporate services included in (1) above;


- ----------
*    The Schedule of Settlements items set forth in clauses (1), (2),
     (5), (7), (8) and (9) will be determined from the applicable First Closing
     Financial Statements or the Closing Pipeline Financial Statements, as the
     case may be.

                                       20

<PAGE>


          (3) Subtract employee benefit costs for benefits provided by (A) ARCO,
     (B) any Affiliate of ARCO that is not a Company or (C) UTP Holdings at the
     rate of 28% of salaries and wages expense, and charges of $1,200,000 for
     the Producing Companies, $500,000 for the Pipeline Companies, and $250,000
     for the Marine Companies, per month, for corporate services, pro-rated for
     any partial month periods;

          (4) Adjust by an amount determined as the product of a specified tax
     rate of 38.5% and net income (loss) before income taxes, as adjusted for
     (2) and (3) above, but without regard to any income or loss relating to any
     Taxes set forth in Section 5.5(a)(i)(D), (E), (G) or (H), and without
     regard to any income or loss relating to any extraordinary transaction
     occurring before the Effective Date;

          (5) Adjust to remove non-cash amounts in (1) above, which will
     include, but not necessarily be limited to, (A) adjustments to remove the
     effects of changes in non-cash working capital but not including any income
     taxes payable or refundable, (B) depreciation, depletion and amortization
     charges, including non-cash charges for future dismantlement, restoration
     and abandonment and (C) non-cash dry hole expense*;

          (6) Plus the amount of taxes (other than income taxes) included in the
     accrued liabilities at December 31, 1999, as shown in the audited Year-End
     Financial Statements referenced in Section 3.7;

          (7) Plus or minus cash flows from investing activities*;

          (8) Plus or minus cash flows from financing activities* other than
     activities with (A) ARCO, (B) any Affiliate of ARCO that is not a Company
     or (C) UTP Holdings;

          (9) (A) Plus any cash investment into or minus any cash withdrawal
     from the capital construction fund of AMI and (B) plus the amount of any
     payments (net of any refunds) made by AMI under the AMI Conveyed Contract*;
     and

          (10) The amount of Settlements shall be computed by subtracting the
     amount computed in items (1) through (9) from any net change during the
     period, expressed as a positive (if an increase) or negative (if a
     decrease) amount, in cash retained in the applicable Company.


- --------
*    The Schedule of Settlements items set forth in clauses (1), (2),
     (5), (7), (8) and (9) will be determined from the applicable First Closing
     Financial Statements or the Closing Pipeline Financial Statements, as the
     case may be.

                                       21

<PAGE>

          (b) Purchaser shall, within 60 days after the delivery by Sellers of
the First Closing Schedules of Settlements, complete its review of Settlements
as reflected on each First Closing Schedule of Settlements. Each First Closing
Schedule of Settlements shall be binding and conclusive upon, and deemed
accepted by, Purchaser unless Purchaser shall have notified Sellers in writing
within 60 days after delivery of the First Closing Schedules of Settlements of
any good faith objection (a "PURCHASER'S OBJECTION") to any item on such First
Closing Schedule of Settlements, PROVIDED that no such objection may be based on
(i) the accounting principles and methodology used in preparation of such First
Closing Schedule of Settlements or the related First Closing Financial
Statements if such accounting principles and methodology are consistent with the
accounting principles and methodology used in preparation of the Producing
Financial Statements or the Marine Financial Statements, as the case may be, and
the provisions of this Agreement or (ii) the pricing of goods, services, costs
and charges between any Company and ARCO or any Affiliate of ARCO to the extent
such pricing is consistent with past practice prior to the Effective Date,
except as expressly provided in clause (3) of Section 2.3(a). A Purchaser's
Objection shall set forth a specific description of the basis of Purchaser's
objection and the adjustments to Settlements reflected on each First Closing
Statement of Settlements which Purchaser believes should be made. Any items not
disputed during the aforementioned 60-day period shall be deemed to have been
accepted by Purchaser.

          (c) If Sellers and Purchaser are unable to resolve all of their
disputes with respect to either First Closing Schedule of Settlements within 15
days following Sellers' receipt of Purchaser's Objection pursuant to Section
2.3(b), they shall refer their remaining differences to Deloitte & Touche or
another internationally recognized firm of independent public accountants as to
which Sellers and Purchaser mutually agree (the "CPA FIRM") for decision as to
whether, insofar as it relates to the unresolved elements of the Purchaser's
Objection, the First Closing Schedule of Settlements that is the subject of the
Purchaser's Objection was prepared in accordance with the procedure set forth in
Section 2.3(a), or whether the relevant First Closing Financial Statements on
which such First Closing Schedule of Settlements was based present fairly in
accordance with GAAP, applied in a manner consistent with the accounting
principles and methodology used in preparation of the Producing Financial
Statements or Marine Financial Statements, as the case may be, the financial
position, results of operations and cash flows of the entities included therein
for the periods presented, which decision shall be final and binding on the
parties. Any unresolved element of Purchaser's Objection shall be submitted to
the CPA Firm only if such element individually would have an effect on the
Producing and Marine Adjustment Payment exceeding $250,000 if resolved in
Purchaser's favor, and then only if the total effect on the Producing and Marine
Adjustment Payment of all unresolved elements of Purchaser's Objection taken
together would exceed $2,000,000 if all such elements were resolved in
Purchaser's favor. Otherwise, each First Closing Schedule of Settlements, as
adjusted pursuant to any agreement between the parties, shall be deemed

                                       22

<PAGE>

accepted by Purchaser. The procedure and schedule under which any dispute shall
be submitted to the CPA Firm shall be as follows:

          (i) Within 15 days following a Purchaser's Objection under Section
     2.3(b), Purchaser shall submit any unresolved elements of its objection to
     the CPA Firm in writing, supported by any documents and/or affidavits upon
     which it relies. Failure to do so shall constitute a withdrawal by
     Purchaser of Purchaser's Objection with respect to any unresolved element
     to which such failure relates.

          (ii) Within 15 days following Purchaser's submission of the unresolved
     elements of Purchaser's Objection as specified in clause (i) above, Sellers
     shall submit their response to the CPA Firm in writing, supported by any
     documents and/or affidavits upon which it relies.

          (iii) The CPA Firm shall deliver its written opinion within 20 days
     following its receipt of the information provided for in clauses (i) and
     (ii) above, or such longer period of time as the CPA Firm determines is
     necessary. Sellers and Purchaser shall make readily available to the CPA
     Firm all relevant books and records and any work papers (including those of
     the parties' respective accountants) relating to the applicable First
     Closing Schedules of Settlements and all other items reasonably requested
     by the CPA Firm.

Each party shall deliver to the other a copy of all material submitted to the
CPA Firm within one Business Day after such material is so submitted. Any
expenses relating to the engagement of the CPA Firm shall be shared equally by
Sellers and Purchaser. Sellers and Purchaser shall each bear the fees of their
respective accountants incurred in connection with the review and determination
contemplated by this Section 2.3(c).

          (d) Each of the Closing Producing Schedule of Settlements and the
Closing Marine Schedule of Settlements shall become final and binding on the
parties upon the earliest of (i) if no Purchaser's Objection has been given with
respect to such First Closing Schedule of Settlements, the expiration of the
period within which Purchaser must make its objection pursuant to Section
2.3(b), (ii) agreement in writing by Sellers and Purchaser that such First
Closing Schedules of Settlements, together with any modifications thereto agreed
by Sellers and Purchaser, shall be final and binding, (iii) the deemed
withdrawal of the last unresolved element of Purchaser's Objection in accordance
with Section 2.3(c)(i), and (iv) the date on which the CPA Firm shall issue its
written determination with respect to any dispute relating to such First Closing
Schedules of Settlements. Each of the Closing Producing Schedule of Settlements
and the Closing Marine Schedule of Settlements, in each case as submitted by
Sellers if no timely Purchaser's Objection has been given or as adjusted
pursuant to any agreement between the parties or as determined pursuant to the
decision of the CPA Firm, when final and

                                       23

<PAGE>

binding on all parties, is herein referred to as the "FINAL CLOSING PRODUCING
SCHEDULE OF SETTLEMENTS" and the "FINAL CLOSING MARINE SCHEDULE OF SETTLEMENTS,"
respectively.

     (e)  Within 10 Business Days following issuance of the Final Closing
Producing Schedule of Settlements and the Final Closing Marine Schedule of
Settlements, respectively, the net adjustment payment payable pursuant to this
Section 2.3(e) (the "PRODUCING AND MARINE ADJUSTMENT PAYMENT") shall be paid by
wire transfer of immediately available funds to a bank account designated by
Sellers or Purchaser, as the case may be. The Producing and Marine Adjustment
Payment shall be equal to (i) the sum of the amounts (whether positive or
negative) shown as Settlements on the Final Closing Producing Schedule of
Settlements and the Final Closing Marine Schedule of Settlements, respectively,
minus (ii) the Producing and Marine Estimated Adjustment, in the case of each of
(i) and (ii), expressed as a positive or negative amount. The Producing and
Marine Adjustment Payment shall be payable by Purchaser to Sellers, if positive,
and by Sellers to Purchaser, if negative.

     (f)  As soon as reasonably practicable, but in no event later than 90 days
after the First Closing Date, ARCO will deliver to Purchaser a statement that
sets forth ARCO's determination of the Product Inventory Purchase Price
Adjustment. ARCO will provide Purchaser access during ARCO's regular business
hours to records necessary for Purchaser to conduct a review of such statement.
As soon as reasonably practicable, but in no event later than 30 days after
Purchaser receives such statement, Purchaser may deliver to ARCO a written
report containing the changes that Purchaser proposes to be made to the
statement. If Purchaser fails to timely deliver the written report to ARCO
containing changes Purchaser proposes to be made to such statement, such
statement as delivered by ARCO will be deemed to be correct and will be final
and binding on the parties and not subject to further review, audit or
adjustment. As soon as practicable, but in no event later than 30 days after
ARCO receives Purchaser's written report, the parties shall meet and undertake
to agree on the final adjustments to the statement. If the parties fail to agree
on the final adjustments to the statement within the 30-day period, either party
may submit the dispute to the CPA Firm for resolution. If neither party submits
the dispute to the CPA Firm for resolution within such 30-day period, the
statement delivered by ARCO will be deemed to be correct and will be final and
binding on the parties and not subject to further review, audit or adjustment.
In resolving any dispute, the CPA Firm shall limit its review to verifying the
Kuparuk Royalty Price, TAPS Royalty Price, Kuparuk Line Fill (in barrels), TAPS
Line Fill (in barrels), Tanker Cargo (in barrels), and Final Product Inventory
Purchase Price. The parties shall direct the CPA Firm to resolve the disputes
within 60 days after having the relevant materials submitted for review. The
decision of the CPA Firm shall be binding on and non-appealable by the parties.
If the Product Inventory Purchase Price Adjustment is negative, then ARCO shall
pay Purchaser an amount equal to the Product Inventory Purchase Price
Adjustment, and if the Product Inventory Purchase Price Adjustment is positive,
then Purchaser shall pay ARCO an amount equal to the Product Inventory Purchase
Price Adjustment. Any amounts owed

                                       24

<PAGE>

by one party to the other as a result of the review process will be paid by wire
transfer of immediately available funds to a bank account designated by ARCO or
Purchaser, as the case may be, within 30 days after the date when the statement
delivered by ARCO to Purchaser becomes final and binding on the parties, final
adjustments to the statement are agreed upon by ARCO and Purchaser or they
receive the decision of the CPA Firm.

          Section 2.4   SECOND CLOSING; PIPELINE ASSETS DELIVERY AND PAYMENT.

          (a) The consummation of the purchase and sale of the Pipeline Assets
(the "SECOND CLOSING"; each of the First Closing and the Second Closing being
referred to herein as a "CLOSING") shall take place at the offices of Sullivan &
Cromwell, 125 Broad Street, New York, New York at 10:00 A.M., New York City
time, on the third Business Day following satisfaction or waiver of the
conditions set forth in Section 6.4 of this Agreement (other than those
conditions that by their terms are to be satisfied at the Second Closing, but
subject to the satisfaction or waiver at or prior to the Second Closing of all
such conditions), or at such other time and place as the parties hereto may
mutually agree. The date and time at which the Second Closing occurs is
sometimes referred to herein as the "SECOND CLOSING DATE".

          (b) At the Second Closing,subject to the provisions of Section 2.4(c):

          (i) ARCO shall deliver to Purchaser (A) certificates evidencing the
     ATAI Shares, the Kuparuk Shares, the Oliktok Shares, the Alpine Shares and
     the CIPC Shares, each duly endorsed in blank or accompanied by stock powers
     duly executed in blank, in proper form for transfer and with any requisite
     stock transfer tax stamps properly affixed thereto, and (B) an instrument
     or instruments of transfer, assignment and conveyance, in a form to be
     reasonably acceptable to Purchaser, sufficient to transfer, assign and
     convey to Purchaser the Alpine Rights-of-Way;

          (ii) ARCO shall cause AMI to execute and deliver to Purchaser, and
     Purchaser shall execute and deliver to AMI, an instrument of assignment and
     assumption, in a form reasonably acceptable to ARCO and Purchaser, for the
     AMI Conveyed Contract; and

          (iii) Purchaser shall pay to Sellers an amount equal to the sum of (A)
     the Initial Pipeline Assets Purchase Price, less any reduction required
     pursuant to Section 2.7, and (B) an estimate (expressed as a positive or a
     negative amount), prepared by Sellers and delivered to Purchaser at least
     three Business Days prior to the Second Closing Date, of any adjustment to
     the Initial Pipeline Assets Purchase Price as of the Second Closing Date
     that will be required in accordance with Section 2.5 (the "PIPELINE
     ESTIMATED ADJUSTMENT"), by wire transfer of immediately available funds to
     an account or accounts designated in writing not less than two

                                       25

<PAGE>

     Business Days prior to the Second Closing by Sellers to Purchaser. The
     Initial Pipeline Assets Purchase Price shall be allocated among the
     Pipeline Assets as set forth on Schedule 2.4(b) of the Disclosure Schedule,
     subject to such adjustments thereto as may be required by any adjustments
     to the Initial Pipeline Assets Purchase Price in accordance with Section
     2.5, which adjustments shall be allocated among the Pipeline Assets in the
     manner agreed by Sellers and Purchaser. The parties agree that the
     foregoing allocation shall be binding on the Sellers and Purchaser and
     their respective Affiliates and shall be used by them for all Tax
     reporting.

          (c) In the event that all Required Governmental Consents and any other
consent or waiver of any third party necessary for the sale, transfer,
assignment, conveyance and delivery of the Pipeline Assets (each, a "NECESSARY
CONSENT") shall have been obtained except that a Preferential Right shall have
been exercised in respect of the ATAI Shares (or the underlying Properties) or
the CIPC Shares, the sale, transfer, assignment, conveyance and delivery of all
Pipeline Assets other than the Shares in respect of which, or in respect of the
underlying Properties of which, a Preferential Right was exercised shall proceed
in accordance with Section 2.4(b), PROVIDED that (i) the Shares in respect of
which, or in respect of the underlying Properties of which, the Preferential
Right was exercised will not be sold, transferred, assigned, conveyed or
delivered to Purchaser and the parties shall have no further obligation to each
other with respect to the same except as provided in Section 2.7, (ii) the
Initial Pipeline Assets Purchase Price shall be reduced as provided in Section
2.7 and (iii) the Pipeline Estimated Adjustment shall exclude any estimated
Settlements with respect to such Shares.

     Section 2.5  ADJUSTMENTS TO THE PIPELINE ASSETS PURCHASE PRICE.

          (a) Within 120 days following the Second Closing Date, Sellers shall
prepare and deliver to Purchaser a schedule of Settlements and audited special
purpose financial statements (including a balance sheet, income statement and
statement of cash flows) for the Pipeline Companies for the period beginning as
of the Effective Date and ending at the close of business on the Second Closing
Date or, in the case of such balance sheet, as at the close of business on the
Second Closing Date (a "CLOSING PIPELINE SCHEDULE OF SETTLEMENTS" and "CLOSING
PIPELINE FINANCIAL STATEMENTS," respectively). The Closing Pipeline Financial
Statements will be prepared in accordance with GAAP, applied in a manner
consistent with the accounting principles and methodology used in preparation of
the Pipeline Financial Statements. The Closing Pipeline Schedule of Settlements
shall include a line item for Settlements for the period covered thereby and
shall be prepared in accordance with the procedures set forth in Section 2.3(a)
to the extent applicable to the Pipeline Companies. The Closing Pipeline
Schedule of Settlements shall be accompanied by a report thereon of Ernst &
Young LLP that the Settlements have been determined in accordance with Section
2.3(a) to the extent applicable to the Pipeline Companies. Purchaser shall
provide ARCO and its accountants full access to the books and records,

                                       26

<PAGE>

any other information, including working papers of its accountants, and to any
employees, to the extent necessary for ARCO to prepare the Closing Pipeline
Schedule of Settlements and the Closing Pipeline Financial Statement delivered
by Sellers. "Settlements" has the meaning described in Section 23(a).

          (b) Purchaser shall, within 60 days after the delivery by ARCO of the
Closing Pipeline Schedule of Settlements, complete its review of Settlements as
reflected on the Closing Pipeline Schedule of Settlements. The Closing Pipeline
Schedule of Settlements shall be binding and conclusive upon, and deemed
accepted by, Purchaser unless Purchaser shall have notified ARCO in writing
within 60 days after delivery of the Closing Pipeline Schedule of Settlements of
any good faith objection to any item on such Closing Pipeline Schedule of
Settlements, PROVIDED that no such objection may be based on (i) the accounting
principles and methodology used in preparation of such Closing Pipeline Schedule
of Settlements or the related Closing Pipeline Financial Statements if such
accounting principles and methodology are consistent with the accounting
principles and methodology used in preparation of the Pipeline Financial
Statements and the provisions of this Agreement or (ii) the pricing of goods,
services, costs and charges between any Pipeline Company and ARCO (or any
Affiliate of ARCO that is not a Company) to the extent such pricing is
consistent with past practice prior to the Effective Date, except as expressly
provided in clause (3) of Section 2.3(a). The procedures for the resolution of
any such good faith objection (which shall constitute a "Purchaser's Objection")
shall be the procedures applicable to a Purchaser's Objection pursuant to
Sections 2.3(b), (c) and (d); PROVIDED that any unresolved element of
Purchaser's Objection shall be submitted to the CPA Firm only if such element
individually would have an effect on the Pipeline Adjustment Payment exceeding
$250,000 if resolved in Purchaser's favor, and then only if the total effect on
the Pipeline Adjustment Payment of all unresolved elements of Purchaser's
Objection taken together would exceed $2,000,000 if all such elements were
resolved in Purchaser's favor. Otherwise, each of the Closing Pipeline Schedule
of Settlements, as adjusted pursuant to any agreement between the Parties, shall
be deemed accepted by Purchaser. The Closing Pipeline Schedule of Settlements,
as submitted by ARCO if no timely Purchaser's Objection has been given or as
adjusted pursuant to any agreement between the parties or as determined pursuant
to the decision of the CPA Firm, when final and binding on all parties, is
herein referred to as the "FINAL CLOSING PIPELINE SCHEDULE OF SETTLEMENTS."

          (c) Within 10 Business Days following issuance of the Final Closing
Pipeline Schedule of Settlements, the net adjustment payment payable pursuant to
this Section 2.5(c) (the "PIPELINE ADJUSTMENT PAYMENT") shall be paid by wire
transfer of immediately available funds to a bank account designated by ARCO or
Purchaser, as the case may be. The Pipeline Adjustment Payment shall be equal to
(i) the amount shown as Settlements on the Final Closing Pipeline Schedule of
Settlements, minus (ii) the Pipeline Estimated Adjustment, in the case of each
of (i) and (ii), expressed as a positive or negative amount, plus (iii) the
amount of any payments (net of any refunds) made by AMI

                                       27

<PAGE>

under the AMI Conveyed Contract during the period beginning on the Effective
Date and ending on the Second Closing Date. The Pipeline Adjustment Payment
shall be payable by Purchaser to ARCO, if positive, and by ARCO to Purchaser, if
negative.

          (d) In the event that the provisions of Section 2.4(c) shall apply in
connection with the Second Closing with respect to any of the Pipeline Assets,
the provisions of this Section 2.5 shall remain in effect, PROVIDED that the
Closing Pipeline Settlement Schedule shall exclude any items attributable to any
Pipeline Company the Shares of which will not be sold, transferred, assigned,
conveyed or delivered to Purchaser in accordance with Section 2.4(c) and 2.7.

          Section 2.6 ACTIONS PRIOR TO FIRST CLOSING.


          (a) Prior to the date hereof:

          (i) ARCO has filed applications with the Alaska Department of Natural
     Resources for approval of the assignments of the ARCO Oil and Gas Leases to
     ARCO Alaska. Upon approval of such assignments, whether before or after the
     First Closing Date, the effective date for each such assignment will be
     February 1, 2000;

          (ii) ARCO Alaska has filed an application with the State of Alaska for
     approval of the transfer of the Alpine Utility Right-of-Way to ARCO; and

          (iii) ARCO Alaska has applied to the Regulatory Commission of Alaska
     ("RCA") for approval of the transfer of the Certificate of Public
     Convenience and Necessity relating to the Alpine crude oil pipeline (the
     "ALPINE CERTIFICATE") to Alpine.

          (b) The parties agree and acknowledge that prior to the First Closing:

          (i) ARCO shall transfer, assign, convey and deliver to ARCO Alaska:
     (A) ARCO's real property interest in the office complex in Anchorage,
     Alaska more particularly described on Schedule 2.6 of the Disclosure
     Schedule, (B) the aircraft leases described on Schedule 2.6 of the
     Disclosure Schedule; and (C) subject to the approval referred to in Section
     2.6(a)(i), the ARCO Oil and Gas Leases;

          (ii) Subject to the approval referred to in Section 2.6(a)(ii), ARCO
     Alaska shall transfer, assign, convey and deliver to ARCO the Alpine
     Utility Right-of-Way;

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<PAGE>

          (iii) Subject to the approval referred to in Section 2.6(a)(iii)
     above, ARCO Alaska shall transfer, assign, convey and deliver to Alpine the
     Alpine Certificate;

          (iv) ARCO shall cause a restructuring of the holdings of UTP Holdings
     such that (A) UTP Energy will be liquidated and will distribute all of the
     capital stock of each of its Subsidiaries to UTP Holdings, after which
     transactions UTP Holdings will hold directly all of the outstanding UTA
     Interests; and (B) UTP Holdings will distribute all of its assets
     (including all of the outstanding shares of common stock of Unistar and the
     former Subsidiaries of UTP Energy) other than the UTA Interests to ARCO,
     such that the only asset of UTP Holdings shall be the UTA Interests;

          (v) In conjunction with the restructuring referred to in clause (iv)
     above, ARCO shall assume the obligations of UTP Holdings under the
     indentures set forth on Schedule 3.15 and UTP Holdings shall be relieved of
     all obligations and covenants under the same;

          (vi) Immediately prior to the consummation of the BP Amoco/ARCO
     Merger, ARCO shall transfer, assign, convey and deliver to Purchaser the
     ARCO Marine Shares, duly endorsed in blank or accompanied by stock powers
     duly executed in blank, in proper form for transfer and with any requisite
     stock transfer stamps properly affixed thereto;

          (vii) Purchaser shall deliver to ARCO an affidavit of citizenship
     dated as of the ARCO Marine Transfer Date and as of the First Closing Date
     and signed on behalf of Purchaser by an executive officer of Purchaser in
     such form as has been accepted by the Maritime Administration,
     demonstrating that Purchaser is a citizen of the United States within the
     meaning of Section 2 of the Shipping Act of 1916, as amended, and is
     qualified under Section 27 of the Merchant Marine Act of 1920, as amended,
     to engage in United States coastwide trade; and

          (viii) The parties shall take all actions required to be taken prior
     to the First Closing Date in accordance with Sections 5.21(a) and 5.22 and
     Schedule 5.6, Section 13, of the Disclosure Schedule.

          (c) Immediately prior to the First Closing, ARCO Alaska shall
transfer, assign, convey and deliver to ARCO the 150 shares of common stock, par
value $1 per share, of CH-20 held by ARCO Alaska. For U.S. federal income tax
purposes, such transfer, assignment, conveyance and delivery in conjunction with
the subsequent sale of the ARCO Alaska Shares to Purchaser (for which an
election under Section 338(h)(10) of the Code will be made by ARCO and Purchaser
in accordance with Section 5.5(f)(i)), is intended to be treated as a sale by
ARCO Alaska of all its assets (excluding the shares of

                                       29

<PAGE>

CH-20 actually distributed to ARCO as described above), followed by a
distribution by ARCO Alaska to ARCO of all its assets (including the
aforementioned shares of CH-20) in a complete liquidation to which Section 332
of the Code applies.

          Section 2.7 PREFERENTIAL RIGHTS. ARCO will deliver or cause to be
delivered any notices to holders of preferential purchase rights that are
required in connection with the sale of the ATAI Shares and CIPC Shares (each, a
"PREFERENTIAL RIGHT") (including any notices required due to the reactivation of
Preferential Rights that may have previously lapsed), using as the relevant
purchase price the portion of the Initial Pipeline Assets Purchase Price
allocated to such Shares on Schedule 2.4(b) of the Disclosure Schedule (in the
case of the ATAI Shares without regard to any adjustment for the Bonds). If,
prior to the Second Closing, a holder of a Preferential Right notifies ARCO that
it elects to exercise its rights with respect to the Shares (or underlying
Properties of the issuer of such Shares) to which its Preferential Right relates
(in accordance with and determined by the agreement creating the Preferential
Right), the Shares, the sale of which is subject to such Preferential Right,
shall not be sold, transferred, assigned, conveyed or delivered to Purchaser and
the Initial Pipeline Assets Purchase Price shall be reduced by the amount
allocated to such Shares on Schedule 2.4(b); PROVIDED that, if the Second
Closing shall have already occurred in accordance with Section 2.4(c) and
thereafter for any reason the purchase and sale of the Shares (or underlying
Properties of the issuer of such Shares) subject to the Preferential Right is
not or cannot be consummated with the holder of the Preferential Right, ARCO
will promptly notify Purchaser and, within ten Business Days after Purchaser's
receipt of such notice, subject to receipt of any Necessary Consents, ARCO will
sell, transfer, assign, convey and deliver to Purchaser, and Purchaser will
purchase and accept from ARCO, such Shares in exchange for the amount allocated
to such Shares on Schedule 2.4(b). Such purchase price shall be subject to
adjustment based on the application of the methodology set forth in Section 2.5
to such Shares for the period beginning as of the Effective Date and ending at
the close of business on the day of the delivery and acceptance of such Shares,
or on such other basis as the parties may agree.

          Section 2.8  CONTINGENT PAYMENTS.

          (a) As additional consideration for ARCO Alaska and UTP Holdings,
Purchaser shall pay to ARCO, on a monthly basis, Sliding Scale Payments (each,
an "SSP") for production from the Producing Properties from the Effective Time
through December 31, 2004; PROVIDED, HOWEVER, that Purchaser's total obligation
to pay SSPs to Seller shall in no event exceed a total of $500,000,000.00.

          (b) Each SSP shall equal the product of (i) WTI Price minus $25.00 and
(ii) Net Revenue Interest Barrels; provided, however, if the SSP for any given
month is a negative number or is zero, no SSP shall be payable for that month.

                                       30

<PAGE>

          (c) For purposes of this Section 2.8: (i) "WTI PRICE" shall mean the
average, rounded to four decimal places, of the mid-point Cushing second line as
quoted in Platt's for WTI for each business day during the relevant month; IT
BEING UNDERSTOOD that (A) the mid-point Cushing second line for any business day
shall be equal to the average of the high and the low Cushing second line as
quoted in Platt's for WTI for such business day and (B) for purposes of this
definition only, the term "business day" shall mean any day on which a Cushing
second line is quoted in Platt's for WTI, and (ii) "NET REVENUE INTEREST
BARRELS" shall mean total barrels of hydrocarbon liquids produced from the
Producing Properties delivered into TAPS Pump Station No. 1 during the relevant
month, as reported in the relevant unit operator's off-take reports filed with
the State of Alaska, but not including any barrels attributable to royalty
obligations except for any royalty obligations which the owner of the Producing
Properties may voluntarily incur subsequent to the First Closing. For the
avoidance of doubt, any transfer of any Producing Property or part thereof by
Purchaser to any Person after the First Closing shall not affect the
calculations to be made under this Section 2.8.

          (d) Each SSP shall be calculated on a calendar monthly basis and,
except as provided in Section 2.8(e), shall be paid within 10 Business Days
following the last day of the relevant month.

          (e) Any SSP obligation for production occurring from the Effective
Time to and including the most recent calendar month-end preceding the First
Closing Date by at least 10 Business Days (the "CUTOFF DATE") shall be treated
as a positive adjustment to the Initial Producing and Marine Assets Purchase
Price (in addition to any adjustments calculated in accordance with the terms of
Section 2.3) for ARCO Alaska and UTP Holdings and shall be credited against the
$500,000,000 maximum amount referred to in Section 2.8(a).

          (f) The SSPs provided by this Section 2.8 shall be allocated to ARCO
Alaska and UTP Holdings as agreed by ARCO and Purchaser.


                                  ARTICLE III
                    REPRESENTATIONS AND WARRANTIES OF SELLERS

     Except as otherwise set forth in the disclosure schedule delivered by
Sellers to Purchaser on the date of execution of this Agreement, as amended as
of April 6, 2000 (the "DISCLOSURE SCHEDULE"), Sellers make the following
representations and warranties to Purchaser (it being understood that any
representation and warranty made with respect to UTP Holdings, UTA or their
respective Properties is not made with respect to any Properties of UTP Holdings
that will not be Properties of UTP Holdings after giving effect to the
restructuring contemplated by Section 2.6(a)(iv)):

                                       31
<PAGE>

          Section 3.1 ORGANIZATION AND AUTHORITY. Each Seller is a corporation
duly incorporated, validly existing and in good standing under the laws of the
State of Delaware. Each Seller has all requisite corporate power and authority
and has taken all corporate action necessary in order to execute, deliver and
perform its obligations under this Agreement and to consummate the transactions
contemplated by this Agreement.

          Section 3.2 BINDING EFFECT. This Agreement has been duly authorized,
executed and delivered by each Seller and constitutes a valid and binding
obligation of such Seller, enforceable against such Seller in accordance with
its terms, subject to bankruptcy, insolvency, fraudulent conveyance,
reorganization, moratorium and similar laws of general applicability relating to
or affecting creditors' rights and to general equity principles (the "BANKRUPTCY
AND EQUITY EXCEPTION").

          Section 3.3 ORGANIZATION, QUALIFICATION AND AUTHORITY OF THE
COMPANIES. Each Company other than UTA is a corporation duly incorporated,
validly existing and in good standing under the laws of the State of Delaware.
UTA is a limited liability company duly formed, validly existing and in good
standing under the laws of the State of Delaware. Each Company (a) has all
requisite corporate or other power and authority to own, lease or otherwise hold
its assets and to carry on its business as currently conducted and (b) is duly
qualified to do business and is in good standing as a foreign corporation or
limited liability company, as the case may be, in each jurisdiction where the
ownership or operation of its assets or the conduct of its business requires
such qualification, except where any failures to have such power and authority
or to be so qualified or in good standing, as the case may be, individually or
in the aggregate, would not be reasonably likely to have a Material Adverse
Effect.

          Section 3.4 OWNERSHIP OF SHARES AND LLC INTERESTS. ARCO owns all of
the Shares other than the ARCO Beluga Shares, of record and beneficially (in the
case of the ARCO Marine Shares, only prior to the delivery contemplated by
Section 2.6(b)(vi)), and CH-20 owns all of the ARCO Beluga Shares, of record and
beneficially, in each case free and clear of all Encumbrances other than
Permitted Encumbrances. With respect to each Company, the Shares or, with
respect to UTA, the UTA Interests are, as of the date hereof and as of the
applicable Closing Date with respect to such Company, the only shares of capital
stock or limited liability company interests, as the case may be, of or in such
Company issued and outstanding except that, as of the date hereof, UTP Holdings
has 100,000 shares of Series A Cumulative Preferred Stock issued and
outstanding. All of the Shares have been duly authorized and validly issued and
are fully paid and non-assessable. The UTA Interests have been duly authorized
and validly issued and are fully paid. As of the date hereof and as of the
applicable Closing Date with respect to each Company, (i) except for this
Agreement and the Preferential Rights referred to in Section 2.7, there are no
preemptive or other outstanding rights, options, warrants, conversion rights or
agreements or commitments of any character relating to the authorized and
issued, unissued or treasury shares of capital stock or limited liability
company interests, as

                                       32

<PAGE>

the case may be, of any of the Companies and no such securities or obligations
evidencing any such rights are outstanding and (ii) none of the Companies has
any outstanding debt or other securities which are convertible into or
exchangeable for, or that give any Person a right to subscribe for or acquire,
capital stock or limited liability company interests of any of the Companies. At
the applicable Closing, Purchaser will obtain good and marketable title to the
Shares delivered at such Closing, free and clear of all Encumbrances other than
Permitted Encumbrances.

          Section 3.5 CONSENTS AND APPROVALS. Except for (a) the issuance by the
FTC of the Provisional Consent Order, (b) the issuance of the State Consent
Order, (c) the termination of the applicable waiting period under the HSR Act,
(d) reports, registrations, filings and/or notices to comply with Environmental
Laws and (e) consents, approvals, waivers or authorizations that may be
obtained, or reports, registrations, filings or notices that may be made, after
the transfer of any Shares or Conveyed Properties, and except as set forth in
Schedule 3.5 of the Disclosure Schedule, no consent, approval, waiver or
authorization is required to be obtained by a Seller or any Company from, and no
report, registration, filing or notice is required to be given by a Seller or
any Company to, or made by a Seller or any Company with, any Governmental Entity
in connection with the execution, delivery and performance by Sellers of this
Agreement, other than where any failures to obtain such consent, approval,
waiver or authorization, or to give or make such report, registration, filing or
notice, individually or in the aggregate, would not be reasonably likely to have
a Material Adverse Effect or materially impair or delay a Seller's ability to
perform its obligations hereunder.

          Section 3.6 NON-CONTRAVENTION. The execution, delivery and performance
by each Seller of this Agreement, and the consummation by each Seller of the
transactions contemplated hereby, do not and will not (a) violate any provision
of the certificate of incorporation or bylaws (or equivalent constituent
documents) of either Seller or any Company, (b) subject to obtaining or making
the consents, approvals, waivers, authorizations, reports, registrations,
filings and notices referred to in Section 3.5 and obtaining the consents set
forth in Schedule 3.6 of the Disclosure Schedule, conflict with, or result in
the breach of, or constitute a default under, or result in the termination,
cancellation or acceleration (whether after the giving of notice or the lapse of
time or both) of any material right or obligation of any Company under, or to a
loss of any material benefit to which any Company is entitled under, any
Contract to which any Company is a party or, except for any Encumbrance arising
under this Agreement, result in the creation of any Encumbrance upon any Shares
or Conveyed Properties to be sold, transferred, assigned, conveyed and delivered
pursuant to this Agreement or the Properties of any Company, or (c) assuming
compliance with the matters set forth in Sections 3.5 and 4.3, to the Knowledge
of Sellers, violate or result in a breach of or constitute a default under any
Law to which either Seller or any Company is subject, including any Governmental
Authorization, other than, in the case of clauses (b) and (c), any conflict,
breach, default, termination, cancellation, acceleration, loss, Encumbrance or

                                       33

<PAGE>

violation which, individually or in the aggregate, would not be reasonably
likely to have a Material Adverse Effect or materially impair or delay either
Seller's ability to perform its obligations hereunder.

          Section 3.7 FINANCIAL STATEMENTS. Schedule 3.7 of the Disclosure
Schedule contains a copy of the following financial statements: (a) a special
purpose unaudited combined balance sheet for the Producing Companies as of
December 31, 1999 and 1998, and the related special purpose unaudited combined
statements of income and statements of cash flows for each of the years then
ended (collectively, the "PRODUCING FINANCIAL STATEMENTS"), (b) a special
purpose unaudited combined balance sheet for the Marine Companies as of December
31, 1999 and 1998, and the related special purpose unaudited combined statements
of income and statements of cash flows for each of the years then ended
(collectively, the "MARINE FINANCIAL STATEMENTS") and (c) a special purpose
unaudited combined balance sheet for the Pipeline Companies as of December 31,
1999 and 1998, and the related special purpose unaudited combined statements of
income and statements of cash flows for each of the years then ended
(collectively, the "PIPELINE FINANCIAL STATEMENTS"and, together with the
Producing Financial Statements and the Marine Financial Statements, the
"YEAR-END FINANCIAL STATEMENTS").Each of the Year-End Financial Statements has
been prepared in accordance with GAAP and presents fairly, in all material
respects, the combined financial position, results of operations and cash flows
of the Producing Companies (in the case of the Producing Financial Statements),
the Marine Companies (in the case of the Marine Financial Statements) and the
Pipeline Companies (in the case of the Pipeline Financial Statements) as of
their respective dates and for the respective periods then ended, except in each
case as may be noted on such Year-End Financial Statements or in the notes
thereto and subject, in each case, to such audit adjustments as may be required
that will not be material in amount or effect. As soon as available to ARCO
after the date hereof, ARCO shall deliver to Purchaser Year-End Financial
Statements which have been audited, together with the report thereon of
PricewaterhouseCoopers LLP.

          Section 3.8 LITIGATION AND CLAIMS.

          (a) Except as set forth in Schedule 3.8(a) of the Disclosure Schedule,
as of the date hereof there is no civil, criminal or administrative action,
suit, hearing, proceeding or investigation pending or, to the Knowledge of
Sellers, threatened, against any Company or any of its Properties other than
those that, individually or in the aggregate, would not be reasonably likely to
have a Material Adverse Effect.

          (b) Except as set forth in Schedule 3.8(b) of the Disclosure Schedule,
as of the date hereof no Company is a party or subject to any order, writ,
judgment, award or injunction of any Governmental Entity applicable to such
Company or any of its Properties

                                       34

<PAGE>

other than those that, individually or in the aggregate, would not be reasonably
likely to have a Material Adverse Effect.

          Section 3.9 TAXES. Except for any failure to file or timely pay,
adjustment, action, proceeding, waiver, audit, or examination that, individually
or in the aggregate, would not be reasonably likely to have a Material Adverse
Effect, (a) all Tax Returns that are required to be filed (taking into account
applicable extensions) by or with respect to the Companies have been duly and
timely filed; (b) all Taxes shown to be due on the Tax Returns referred to in
clause (a) and all Taxes for periods ending on or before the date of this
Agreement for which Tax Returns have not yet been filed have been timely paid or
recorded as Tax Reserves or current liabilities in the Books and Records; (c) no
adjustments relating to the Tax Returns referred to in clause (a) have been
proposed by the appropriate Governmental Entity; (d) there are no pending or, to
the Knowledge of Sellers, threatened actions or proceedings for the assessment
or collection of Taxes against the Companies; (e) there are no outstanding
waivers or agreements extending the applicable statute of limitations for any
period with respect to any Taxes of the Companies; (f) to the Knowledge of
Sellers no taxing authorities are presently conducting any audits or other
examinations of any Tax Returns referred to in clause (a).

          Section 3.10 COMPLIANCE WITH LAWS. Except as set forth in
Schedule 3.10 of the Disclosure Schedule and except for such matters that,
individually or in the aggregate, would not be reasonably likely to have a
Material Adverse Effect: (a) each Company is conducting its business in
compliance with all applicable Laws, (b) each Company has or is entitled to the
benefits of all Governmental Authorizations necessary for the conduct of its
business as currently conducted and (c) there are no proceedings pending or, to
the Knowledge of Seller, threatened, which would be reasonably likely to result
in the revocation, cancellation or suspension of any such Governmental
Authorization.

          Section 3.11 CONTRACTS. Schedule 3.11 of the Disclosure Schedule sets
forth each Material Contract. Except as set forth on Schedule 3.11 of the
Disclosure Schedule, as of the date hereof each Material Contract is a valid and
binding agreement of the Seller or the Company party thereto and is in full
force and effect in accordance with its terms, subject to the Bankruptcy and
Equity Exception. Except as set forth on Schedule 3.11 of the Disclosure
Schedule, there exists no default under any Material Contract by either Seller
or the applicable Company or, to the Knowledge of Sellers, any other party
thereto, which default has not been cured or waived, other than such defaults
that, individually or in the aggregate, would not be reasonably likely to have a
Material Adverse Effect.

          Section 3.12 PROPERTIES. The Properties of the Companies and the
Conveyed Properties (after giving effect to the transactions contemplated by
Section 2.6) to be sold, transferred, assigned, conveyed and delivered pursuant
to this Agreement (a)

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<PAGE>

constitute all of the assets and properties, tangible and intangible, of ARCO
and its Subsidiaries located in the State of Alaska that are used in, associated
with or connected to the business of exploration for and production and
transportation of oil, natural gas and other liquid and gaseous hydrocarbons and
other minerals conducted by ARCO and its Subsidiaries in the State of Alaska
(the "ALASKA BUSINESS") and (b) considered together with the Books and Records,
the license and other arrangements contemplated by Section 5.15 and the
transitional services to be provided pursuant to Section 5.17, constitute all of
the assets and properties, tangible and intangible, including all geological and
geophysical data and interpretations and lease bids, wherever located, that are
primarily used in, associated with or connected to the Alaska Business.

          Section 3.13 ABSENCE OF CHANGES. Except (x) to the extent arising out
of or relating to the transactions contemplated by this Agreement, (y) as set
forth on Schedule 3.13 of the Disclosure Schedule or (z) to the extent arising
out of or relating to the Charter or, after the Provisional Consent Order has
been issued by the FTC, the Provisional Consent Order or, after the State
Consent Order has been issued, the State Consent Order, since December 31, 1999,
(i) the respective businesses of each of the Companies has been operated in the
ordinary course consistent with past practice, (ii) there has not been any
change in the Companies which, individually or in the aggregate, would be
reasonably likely to have a Material Adverse Effect and (iii) no Company has
settled, compromised, waived, released or assigned any material rights or claims
it has under or in respect of any Material Contract to which such Company is a
party.

          Section 3.14 FINDERS' FEES. There is no investment banker, broker,
finder or other intermediary which has been retained by or is authorized to act
on behalf of either Seller or any of the Companies who is entitled to any fee or
commission that is or will be an obligation of any Company in connection with
the purchase and sale of the Shares and the Conveyed Properties pursuant to this
Agreement.

          Section 3.15 INDEBTEDNESS. As of the Closing Date applicable to such
Company, no Company shall have any loans, borrowings or other indebtedness in
the nature of borrowings outstanding, in each case where monies are due from any
Company, except as reflected in the Financial Statements or as set forth on
Schedule 3.15 of the Disclosure Schedule.

          Section 3.16 EMPLOYEE BENEFITS. No Personnel currently participate
in any employee benefit plan that is a multiemployer plan as defined in Section
3(37) of the Employee Retirement Income Security Act of 1974, as amended
("ERISA"), or that is otherwise required to be provided to such Personnel
pursuant to the terms of any collective bargaining agreement. No severance pay
or benefits, pay in lieu of notice, or similar pay or benefits will be owed to
any Personnel solely by reason of the consummation of the transactions
contemplated hereby. Except as set forth in Schedule 5.3 of the Disclosure
Schedule and Exhibit B of Schedule 5.6 of the Disclosure

                                       36

<PAGE>

Schedule, none of the Companies, CIPC or any of their respective Subsidiaries
sponsors any employee benefit plan within the meaning of Section 3(3) of ERISA
or any other employee benefit plan, program, policy, practices, or other
arrangement (collectively, "EMPLOYEE PLANS") providing incentive compensation or
benefits to any Personnel.

          Section 3.17 NO OTHER REPRESENTATIONS OR WARRANTIES. Except for the
representations and warranties contained in this Article III and Section 5.5,
none of Seller, the Companies or any other Person makes any other express or
implied representation or warranty on behalf of Seller, the Companies or
otherwise in respect of the Shares or the Conveyed Properties.

                                   ARTICLE IV
                   REPRESENTATIONS AND WARRANTIES OF PURCHASER

     Purchaser makes the following representations and warranties to Sellers:

          Section 4.1 ORGANIZATION AND AUTHORITY. Purchaser is a corporation
duly incorporated, validly existing and in good standing under the laws of the
State of Delaware. Purchaser has all requisite corporate power and authority and
has taken all corporate action necessary in order to execute, deliver and
perform its obligations under this Agreement and to consummate the transactions
contemplated hereby.

          Section 4.2 BINDING EFFECT. This Agreement has been duly authorized,
executed and delivered by Purchaser and constitutes a valid and b inding
obligation of Purchaser, enforceable against Purchaser in accordance with its
terms, subject to the Bankruptcy and Equity Exception.

          Section 4.3 CONSENTS AND APPROVALS. Other than (a) the approval of the
Maritime Administration in connection with Purchaser's acquisition of the ARCO
Marine Shares and (b) the termination of the applicable waiting period under the
HSR Act, no consent, approval, waiver or authorization is required to be
obtained by Purchaser or any of its Affiliates from, and no report,
registration, filing or notice is required to be given by Purchaser or any of
its Affiliates to or made by Purchaser or any of its Affiliates with, any
Governmental Entity in connection with the execution, delivery and performance
by Purchaser of this Agreement.

          Section 4.4 NON-CONTRAVENTION. The execution, delivery and performance
by Purchaser of this Agreement, and the consummation by Purchaser of the
transactions contemplated hereby, do not and will not (a) violate any provision
of the certificate of incorporation or by-laws of Purchaser, (b) conflict with,
or result in the breach of, or constitute a default under, or result in the
termination, cancellation or acceleration (whether after the giving of notice or
the lapse of time or both) of any material right or obligation of Purchaser
under, or to a loss of any material benefit to

                                       37

<PAGE>

which Purchaser is entitled under, any Contract to which Purchaser or any of its
Affiliates is a party, or (c) assuming compliance with the matters set forth in
Sections 3.5 and 4.3, to the knowledge of Purchaser, violate or result in a
breach of or constitute a default under any Law to which Purchaser is subject,
including any Governmental Authorization, other than in the cases of clauses (b)
and (c), any conflict, breach, default, termination, cancellation, acceleration,
loss or violation which, individually or in the aggregate, would not be
reasonably likely to have a material adverse effect on Purchaser or materially
impair or delay Purchaser's ability to perform its obligations hereunder.

          Section 4.5 FINDERS' FEES. There is no investment banker, broker,
finder or other intermediary which has been retained by or is authorized to act
on behalf of Purchaser who is entitled to any fee or commission in connection
with the purchase and sale of the Shares and the Conveyed Properties pursuant to
this Agreement.

          Section 4.6 FINANCIAL CAPABILITY. On each Closing Date, Purchaser will
have available sufficient funds to purchase the Shares and any Conveyed
Properties to be sold, transferred, assigned, conveyed and delivered on such
Closing Date on the terms and subject to the conditions set forth in this
Agreement and to consummate the transactions contemplated for the applicable
Closing hereunder. The obligations of Purchaser hereunder are not subject to any
conditions regarding the ability of Purchaser to obtain financing for the
consummation of the transactions contemplated herein.

          Section 4.7 INVESTIGATION BY PURCHASER. Purchaser acknowledges that it
is a sophisticated purchaser of businesses and has been given sufficient access
to all information with respect to the Companies and the Conveyed Properties
requested by Purchaser and, in entering into this Agreement, has not relied upon
anything other than the representations and warranties of Sellers set forth in
Article III and Section 5.5. Purchaser acknowledges that neither Seller nor any
other Person shall have any liability with respect to any information with
respect to the Companies and the Conveyed Properties made available to Purchaser
prior to the date hereof. Purchaser has no knowledge that any representation or
warranty of Sellers is inaccurate in any respect.

          Section 4.8 PURCHASER IMPEDIMENTS. There is no civil, criminal or
administrative action, suit, hearing, proceeding or investigation pending or, to
the knowledge of Purchaser, threatened, or outstanding, order, writ, judgment,
award or injunction of any Governmental Entity, against Purchaser or any of its
Affiliates that, individually or in the aggregate, would be reasonably likely to
impair or delay the ability of Purchaser to obtain the consents, approvals,
waivers or authorizations described in Section 4.3 or impair or delay the
ability of the parties hereto to consummate the transactions contemplated
hereby.

          Section 4.9 SECURITIES ACT. Purchaser is acquiring the Shares for its
own account and not with a view to their distribution within the meaning of
Section 2(11)

                                       38

<PAGE>

of the Securities Act in any manner that would be in violation of
the Securities Act. Purchaser has not, directly or indirectly, offered the
Shares to anyone or solicited any offer to buy the Shares from anyone, so as to
bring such offer and sale of the Shares by Purchaser within the registration
requirements of the Securities Act. Purchaser will not sell, convey, transfer or
offer for sale any of the Shares except upon compliance with the Securities Act
and any applicable state securities laws or pursuant to any exemption therefrom.

          Section 4.10 NO OTHER REPRESENTATIONS OR WARRANTIES. Except for the
representations and warranties contained in this Article IV, neither Purchaser
nor any other Person makes any express or implied representation or warranty on
behalf of Purchaser.

                                   ARTICLE V
                                    COVENANTS

          Section 5.1   ACCESS.

          (a)  Prior to the each Closing, Sellers shall permit Purchaser and its
representatives to have access, during regular business hours and upon
reasonable advance notice, to the personnel and properties of Sellers and the
Companies, subject to reasonable rules and regulations of Sellers, and shall,
subject to applicable Laws regarding the exchange of information, furnish, or
cause to be furnished, to Purchaser such financial and operating data and other
information, in each case relating to the Companies and the Conveyed Properties
that are the subject of such Closing, as are available and as Purchaser shall
from time to time reasonably request, PROVIDED, that the foregoing shall not
require Sellers or any Company to permit any inspection, or to disclose any
information, that in the reasonable judgment of Sellers or such Company, would
(i) result in the disclosure of any trade secrets of third parties or the loss
of any applicable attorney-client privilege or (ii) violate any of its
obligations with respect to confidentiality if Sellers or the Company, as the
case may be, shall have used reasonable efforts to obtain the consent of such
third party to such inspection or disclosure, PROVIDED, FURTHER, that Purchaser
and its representatives shall not conduct any on-site tests or sampling or any
boring, digging, drilling or other physical intrusion on or into the properties
of the Companies. All requests for information made pursuant to this Section
shall be directed to an executive officer of ARCO, or such Person as may be
designated by such executive officer. All such information shall be governed by
the terms of the Confidentiality Agreement.

          (b) All information that relates to Sellers or any of their Affiliates
(other than the Companies) that is provided, conveyed, obtained or furnished to
Purchaser or Purchaser's representatives or that Purchaser or Purchaser's
representatives otherwise obtain in the course of Purchaser's investigation of
the Companies, together with any

                                       39

<PAGE>

reports, analyses, compilations, memoranda, notes and any other writings
prepared by Purchaser or Purchaser's representatives which contain, reflect or
are based upon any such information ("CONFIDENTIAL INFORMATION"), shall be kept
strictly confidential by Purchaser and Purchaser's representatives after the
Closings. Purchaser agrees that, in the event it or any its representatives are
required to disclose any Confidential Information (i) in connection with any
judicial or administrative proceedings (by oral questions, interrogatories,
requests for information or documents, subpoena, civil investigative demand or
similar process) or (ii) in order, in the opinion of Purchaser's outside
counsel, to avoid violating the federal securities laws, Purchaser will in
advance of such disclosure provide Sellers with prompt notice of such
requirement(s). Purchaser also agrees, to the extent legally permissible, to
provide Sellers, in advance of any such disclosure, with copies of any such
information Purchaser intends to disclose (and, if applicable, the text of the
disclosure language itself) and to cooperate with Sellers to the extent Sellers
may seek to limit such disclosure. If, in the absence of a protective order or
receipt of a waiver from Sellers after a request in writing therefor is made by
Purchaser (such request to be made as soon as practicable to allow Sellers a
reasonable amount of time to respond thereto), Purchaser or its representatives
are legally required to disclose such information to any tribunal or in order to
comply with the federal securities laws, Purchaser or its representatives may
disclose such portion of such information which Purchaser, in the opinion of
Purchaser's outside counsel, is legally required to disclose so long as
Purchaser exercises its best efforts to obtain assurances that the information
so disclosed will be kept confidential by any recipient(s).

          (c) In the event of termination of this Agreement, Purchaser shall
promptly deliver to Sellers, or certify to Sellers that it has destroyed, all
documents, work papers and other material obtained by Purchaser or on its behalf
from Sellers, the Companies or any of their respective agents, employees or
representatives as a result hereof or in connection herewith, whether so
obtained before or after the execution hereof.

          Section 5.2 RETENTION OF RECORDS. Purchaser shall retain, and cause
its Affiliates to retain, all Books and Records relating to the conduct of the
businesses of the Companies and the operation of the Properties prior to the
applicable Closing Date with respect to such Companies or Properties for a
period of at least six years from the date hereof. Upon reasonable notice to
Purchaser and with Purchaser's prior consent, which consent Purchaser will not
withhold or delay unreasonably, Sellers may inspect and make copies of any such
records for any reasonable purpose during business hours; PROVIDED that Sellers
shall have no right to inspect or copy any competitively sensitive information
unless Sellers shall demonstrate to the reasonable satisfaction of Purchaser
that reasonable safeguards designed to prevent the disclosure of such sensitive
information have been established. No such Books and Records shall be destroyed
by Purchaser without first

                                       40

<PAGE>

advising Sellers in writing and giving Sellers a reasonable opportunity to
obtain possession thereof.

          Section 5.3 CONDUCT OF BUSINESS. During the period from the date
hereof to the applicable Closing in respect of each Company, except as otherwise
contemplated by this Agreement, as required by Law or as Purchaser shall
otherwise consent to in writing (which consent shall not be unreasonably
withheld or delayed), each Seller covenants and agrees that it shall cause each
such Company to operate its respective business in the ordinary course
consistent with past practice and to preserve intact the business and
relationships of such Company with third parties; PROVIDED that no action
permitted by the next succeeding sentence shall be deemed to violate this
provision. During the period from the date hereof to the
applicable Closing in respect of each Company, except (a) as otherwise
contemplated by this Agreement or the capital budget of ARCO Alaska for the
fiscal year 2000 previously made available to Purchaser and any capital budget
for the fiscal year 2001 (which shall not provide for capital expenditures in
excess of 10% in excess of the amounts set forth in the fiscal year 2000 capital
budget), (b) as required by Law (including the Provisional Consent Order, any
final order of the FTC in respect thereof and the State Consent Order) or the
Charter or (c) as Purchaser shall otherwise consent, each Seller covenants and
agrees that it shall use its reasonable best efforts to cause each such Company
not to:

          (i) approve any new capital expenditures in excess of 10% over the
     amount budgeted for such expenditures in the capital budgets hereinabove
     referenced;

          (ii) (x) incur, create or assume any material Encumbrance on any
     Property other than Permitted Encumbrances, or (y) dispose of any capital
     assets if the greater of the book value and the fair market value of such
     capital assets exceeds $15,000,000 in the aggregate;

          (iii) incur or assume any material indebtedness for money borrowed or
     guarantee any such obligations other than (A) any loans from such Seller or
     an Affiliate of such Seller or (B) indebtedness under existing lines of
     credit in amounts consistent with past practice;

          (iv) enter into any material transaction other than as disclosed on
     Schedule 5.3 of the Disclosure Schedule or in the ordinary course of
     business consistent with past practice;

          (v) other than as disclosed on Schedule 5.3 of the Disclosure
     Schedule, as required by Law or existing agreements or as is consistent
     with the conduct of its normal business, grant any salary or wage increases
     that in the aggregate would be material to the Companies, or modify or
     amend any benefit plan in any way that

                                       41

<PAGE>

     materially increases the amount of the liability attributable to such
     Company in respect of such plan or grant any benefit to Personnel that
     would become payable as a result of the transactions contemplated hereby;

          (vi) amend its certificate of incorporation or by-laws or equivalent
     constituent documents;

          (vii)issue or sell any Shares, limited liability company interests or
     other equity securities to anyone other than such Seller, or issue or sell
     any securities convertible into, or options with respect to, or warrants to
     purchase or rights to subscribe for, any Shares, limited liability company
     interests or other equity securities, or enter into any agreement
     obligating it to do any of the foregoing;

          (viii)declare or set aside for payment any dividends to be paid after
     the applicable Closing; and

          (ix) enter into any Affiliate Transaction other than as disclosed on
     Schedule 5.3 of the Disclosure Schedule or in the ordinary course of
     business.

          Section 5.4 FILINGS; OTHER ACTIONS; NOTIFICATIONS.

          (a) Sellers and Purchaser shall cooperate with each other and use (and
shall cause their respective Subsidiaries to use) their respective reasonable
best efforts to take or cause to be taken all actions, and do or cause to be
done all things, necessary, proper or advisable on its part under this Agreement
and applicable Laws to consummate and make effective the transactions
contemplated hereby as soon as practicable, including preparing and filing as
soon as practicable all documentation to effect or obtain as soon as practicable
all consents, approvals, waivers, authorizations, reports, registrations,
filings and notices necessary or advisable to be obtained from any third party
and/or any Governmental Entity in order to consummate the transactions
contemplated hereby.

          (b) Subject to applicable Laws relating to the exchange of information
and the preservation of any applicable attorney-client privilege, Sellers and
Purchaser shall have the right to review in advance, and to the extent
practicable each will consult the other on, all the information relating to
Sellers or Purchaser, as the case may be, and any of their respective
Affiliates, that appear in any statement, filing, notice or application made
with, or written materials submitted to, any third party and/or any Governmental
Entity in connection with the transactions contemplated by this Agreement. In
exercising the foregoing right, each of Sellers and Purchaser shall act
reasonably and as promptly as practicable.

          (c) Subject to applicable Laws and the preservation of any applicable
attorney-client privilege, the Sellers and Purchaser each shall, upon request by
the other, furnish the other with all information concerning itself, its
Subsidiaries, directors, officers

                                       42

<PAGE>

and stockholders and such other matters as may be reasonably necessary or
advisable in connection with the Provisional Consent Order, any final order of
the FTC in respect thereof, the State Consent Order, the Charter and any
statement, filing, notice or application made by or on behalf of Sellers, the
Companies or Purchaser or any of their respective Subsidiaries to any third
party and/or any Governmental Entity in connection with the transactions
contemplated by this Agreement.

          (d) Without limiting the generality of the undertakings pursuant to
this Section 5.4, each Seller and Purchaser agrees to take or cause to be taken
the following actions: (i) provide promptly to any Governmental Entity with
jurisdiction over enforcement of any applicable Competition Laws ("GOVERNMENT
ANTITRUST ENTITY") information and documents requested by any Government
Antitrust Entity or necessary, proper or advisable to permit consummation of the
transactions contemplated by this Agreement, (ii) contest and resist any action
seeking to have imposed any order, decree, judgment, injunction, ruling or other
order (whether temporary, preliminary or permanent) other than the Provisional
Consent Order, any final order of the FTC in respect thereof and the State
Consent Order (an "ORDER"), that would materially delay, restrain, enjoin or
otherwise prohibit consummation of the transactions contemplated hereby; it
being understood that in the event that any such temporary or preliminary Order
is entered in any proceeding that would make consummation of the transactions
contemplated hereby in accordance with the terms of this Agreement unlawful or
that would prevent or materially delay consummation of the transactions
contemplated by this Agreement, each Seller and Purchaser agrees to use its
reasonable best efforts to take promptly any and all steps (including the appeal
thereof, the posting of a bond or the taking of the steps contemplated by clause
(i) of this paragraph) necessary to vacate, modify or suspend such Order so as
to permit such consummation and (iii) use its reasonable best efforts to take
all action necessary or reasonably required in order for ARCO and BP Amoco to
obtain and to comply with the Provisional Consent Order, any final order of the
FTC in respect thereof, the State Consent Order and the Charter and to
consummate the transactions contemplated hereby in a manner consistent with the
Provisional Consent Order, any final order of the FTC in respect thereof, the
State Consent Order and the Charter, PROVIDED, that no party shall be required
to take any such action if the result of such action would be to affect
materially and adversely the economic benefits reasonably expected to be derived
by such party from the consummation of the transactions contemplated hereby

          Section 5.5 TAX MATTERS.

          (a) LIABILITY FOR TAXES AND RELATED MATTERS.

          (i) LIABILITY FOR TAXES. Sellers shall pay or cause to be paid, and
     shall indemnify each Purchaser Tax Indemnitee and fully protect, save and
     hold each Purchaser Tax Indemnitee harmless from and against the following:
     (A) any Tax imposed upon or relating to the Sellers (other than in respect
     of the Companies,

                                       43

<PAGE>

     the AMI Conveyed Properties, the AMI Conveyed Contract, the Alpine
     Rights-of-Way, the Product Inventory or CIPC) for any period (whether
     before or after any Closing Date), including any such Tax for which the
     Purchaser or a Company may be liable under Section 1.1502-6 of the Treasury
     Regulations (or any similar provision of state, local or foreign law), as a
     transferee or successor, by contract or otherwise; (B) any consolidated,
     combined or unitary Taxes (other than in respect of the Companies, the AMI
     Conveyed Properties, the AMI Conveyed Contract, the Alpine Rights-of-Way,
     the Product Inventory or CIPC) of any group of which any of the Sellers, BP
     Amoco or any of their respective Affiliates is a member or is the common
     parent; (C) any consolidated, combined or unitary Taxes imposed upon or
     relating to any of the Companies, the AMI Conveyed Properties, the AMI
     Conveyed Contract, the Alpine Rights-of-Way, the Product Inventory or CIPC
     for any Pre-Closing Period; (D) any Taxes resulting from or arising out of
     any transaction set forth in Section 2.6 of this Agreement or otherwise
     contemplated hereunder or any other transaction undertaken in any
     Pre-Closing Period by any of the Sellers or the Companies or any of their
     Affiliates outside of the ordinary course of business; (E) any Taxes
     imposed upon or relating to UTP Energy, Unistar or any Subsidiary, entity,
     Property or asset held directly or indirectly by UTP Holdings prior to the
     restructuring set forth in Section 2.6(b)(iv) that will not be so held
     after such restructuring; (F) any Taxes imposed upon or relating to any of
     the Companies, the AMI Conveyed Properties, the AMI Conveyed Contract, the
     Alpine Rights-of-Way or CIPC for the Pre-Effective Time Period (regardless
     of when such Taxes are paid) and any Taxes imposed upon or relating to the
     Product Inventory for the Pre-Closing Period (regardless of when such Taxes
     are paid); (G) any Taxes resulting from or arising out of any Section
     338(h)(10) Election; (H) any Tax (and any interest pursuant to Code Section
     7518(g)(3)(C)(ii)) arising from or relating to the "capital construction
     fund" of ARCO or any of its Affiliates; (I) any Losses arising from a
     deemed termination, if any, under Section 708(b)(1)(B) of the Code, of any
     tax partnership resulting from the transactions contemplated hereby to the
     extent such Losses are asserted by a third party partner in such tax
     partnership; (J) any Taxes resulting from any breach of any representation
     or warranty of Sellers contained in Section 5.5(j) of this Agreement; (K)
     royalty claims and severance Taxes for production through and including
     December 31, 1999 (regardless of when such amounts are paid); (L) any Tax
     imposed on any Purchaser Tax Indemnitee as a result of structuring any
     transaction as a like-kind exchange pursuant to Section 5.5(g); and (M) any
     Taxes resulting from or arising out of Section 5.22(d) or any of the
     transactions set forth therein. Sellers shall be entitled to any refund of
     Taxes to the extent that such refund relates to a Tax liability paid by the
     Sellers under this Section 5.5(a)(i);

          (ii) Purchaser shall, except to the extent that such Taxes or other
     amounts are the responsibility of Sellers under Section 5.5(a)(i) or
     otherwise

                                       44

<PAGE>

     hereunder, pay or cause to be paid, and shall indemnify each Seller Tax
     Indemnitee and fully protect, save and hold each Seller Tax Indemnitee
     harmless from and against all Taxes imposed upon or relating to the
     Companies, the AMI Conveyed Properties, the AMI Conveyed Contract, the
     Alpine Rights-of-Way, the Product Inventory or CIPC. Purchaser shall be
     entitled to any refund relating to the Companies, the AMI Conveyed
     Properties, the AMI Conveyed Contract, the Alpine Rights-of-Way, the
     Product Inventory or CIPC, except to the extent Sellers are entitled to
     such refund under Section 5.5(a)(i).

          (iii) In the case of any indemnified Tax which a Tax Indemnitee is
     required to pay a Governmental Entity, the indemnitor shall pay the Tax
     Indemnitee the amount for which the indemnitor is responsible pursuant to
     Section 5.5(a)(i) or (ii) in immediately available funds no later than
     three days prior to the date such Tax is due to the relevant Governmental
     Entity (PROVIDED that, without duplication of any amount taken into account
     pursuant to clause (6) of the definition of "Settlements", in the case of
     any Tax (other than any consolidated, combined or unitary Tax) for which
     Sellers are responsible under Section 5.5(a)(i)(F) or (K) that is paid on
     or after January 1, 2000 and on or prior to the applicable Closing Date,
     Sellers shall pay Purchaser the amount for which Sellers are responsible
     under Section 5.5(a)(i)(F) or (K) on the applicable Closing Date).

          (iv) Notwithstanding the foregoing clauses (i) and (ii), the
     liabilities, obligations and entitlements pursuant to such clauses of CH-20
     shall be with respect to ARCO Beluga only.

          (v) TAXES FOR SHORT TAXABLE YEAR. For purposes of paragraphs (a)(i)
     and (a)(ii), whenever it is necessary to determine the liability for Taxes
     of a Company (including any such liability arising from partnership income
     or loss) or with respect to any of the AMI Conveyed Properties, the AMI
     Conveyed Contract, the Alpine Rights-of-Way, the Product Inventory or CIPC
     for a portion of a taxable year or period that begins before and ends after
     the applicable Closing Date (or December 31, 1999), the determination of
     the Taxes of such Company (or with respect to any of the AMI Conveyed
     Properties, the AMI Conveyed Contract, the Alpine Rights-of-Way, the
     Product Inventory or CIPC) for the portion of the year or period ending on,
     and the portion of the year or period beginning after, the applicable
     Closing Date (or December 31, 1999) shall be determined by assuming a
     taxable year or period for such Company (or partnership) or with respect to
     any of the AMI Conveyed Properties, the AMI Conveyed Contract, the Alpine
     Rights-of Way, the Product Inventory or CIPC which ended at the applicable
     Closing Date (or December 31, 1999), except that exemptions, allowances or
     deductions that are calculated on an annual basis, such as the deduction
     for depreciation, shall be apportioned on a time basis.

                                       45

<PAGE>

          (vi) ADJUSTMENT TO PURCHASE PRICE. Any payment by Sellers to Purchaser
     pursuant to Section 5.5(a)(i) will be treated as an adjustment to the
     Purchase Price.

          (vii)TAX RETURNS. Sellers shall file or cause to be filed when due all
     Tax Returns that are required to be filed by or with respect to the
     Companies for taxable years or periods ending on or before the applicable
     Closing Date (which Tax Returns shall be filed in a manner consistent with
     past practice) and shall pay any Taxes due in respect of such Tax Returns,
     and Purchaser shall file or cause to be filed when due all Tax Returns that
     are required to be filed by or with respect to the Companies for taxable
     years or periods ending after the applicable Closing Date and shall pay any
     Taxes due in respect of such Tax Returns. Purchaser shall not amend, or
     cause to be amended, any Tax Returns required to be filed by Sellers.
     Sellers shall pay Purchaser the Taxes for which Sellers are liable pursuant
     to Section 5.5(a)(i) but which are payable with Tax Returns to be filed by
     Purchaser pursuant to the previous sentence within 10 days prior to the due
     date for payment of such Tax.

          (viii) CONTEST PROVISIONS. Purchaser shall promptly notify Sellers in
     writing upon receipt by Purchaser, any of its Affiliates or any Company of
     notice of any pending or threatened Tax audits or assessments which may
     affect the Tax liabilities of any Company for which Sellers would be
     required to indemnify Purchaser pursuant to Section 5.5(a)(i). Sellers
     shall have the sole right to represent any Company's interest in any Tax
     audit or administrative or court proceedings (a "TAX PROCEEDING") relating
     solely to Taxes which may be the subject of indemnification by Sellers
     under Section 5.5(a)(i) and to employ counsel of its choice at its expense.
     Purchaser shall have the sole right to represent any Company's interest in
     any Tax Proceeding relating solely to Taxes which may be the subject of
     indemnification by Purchaser under Section 5.5(a)(ii) and to employ counsel
     of its choice at its expense. With respect to any Tax Proceeding relating
     to Taxes, a portion of which is the subject of indemnification by Sellers
     under Section 5.5(a)(i) and a portion of which is the subject of
     indemnification by Purchaser under Section 5.5(a)(ii), Sellers shall have
     the right to participate in such Tax Proceeding; provided, however, that
     with the written consent of Purchaser and at their own expense, Sellers may
     assume the entire defense of such Tax Proceeding.

          (ix) TERMINATION OF TAX ALLOCATION AGREEMENTS. Any tax allocation or
     sharing agreement or arrangement, whether or not written, that may have
     been entered into by Sellers and any Company (or CIPC) shall be terminated
     as to such Company (or CIPC) as of the applicable Closing Date, or, with
     respect to ARCO Marine, as of the ARCO Marine Transfer Date, and no
     payments which would be

                                       46

<PAGE>

     owed by or to such Company (or CIPC) pursuant thereto shall be made
     thereunder.

          (b)  TRANSFER TAXES. Notwithstanding Sections 5.5(a)(i) and (ii),
Purchaser, on the one hand, and Sellers, on the other hand, shall share equally
all transfer, sales, excise and similar Taxes, if any, arising from the purchase
and sale of the Shares, the AMI Conveyed Properties, the AMI Conveyed Contract,
the Alpine Rights-of-Way or the Product Inventory.

          (c)  INFORMATION TO BE PROVIDED BY PURCHASER. With respect to the
taxable year of Sellers ending December 31, 1999 and all relevant taxable
periods in 2000 prior to the applicable Closing Date, Purchaser shall cause each
Company to prepare and provide to Sellers a package of tax information materials
(the "TAX PACKAGE"), which shall be completed in accordance with past practice
including past practice as to providing the information, schedules and work
papers and as to the method of computation of separate taxable income or other
relevant measure of income of such Company. Purchaser shall cause to be
delivered to Sellers the Tax Package for the taxable period ending on December
31, 1999 by August 1, 2000 and for the taxable period ending on the applicable
Closing Date by June 30, 2001.

          (d)  ASSISTANCE AND COOPERATION. After the applicable Closing Date,
each of Sellers and Purchaser shall:

          (i) assist (and cause their respective Affiliates to assist) the other
     party in preparing any Tax Returns or reports which such other party is
     responsible for preparing and filing in accordance with this Section 5.5;

          (ii) cooperate fully in preparing for any audits of, or disputes with
     taxing authorities regarding, any Tax Returns of any Company;

          (iii) make available to the other and to any taxing authority as
     reasonably requested all information, records, and documents relating to
     Taxes of any Company;

          (iv) provide timely notice to the other in writing of any pending or
     threatened tax audits or assessments of any Company for taxable periods for
     which the other may have a liability under this Section 5.5; and

          (v) furnish the other with copies of all correspondence received from
     any taxing authority in connection with any tax audit or information
     request with respect to any such taxable period.

                                       47
<PAGE>

          (e) SURVIVAL OF OBLIGATIONS. The obligations, representations and
covenants of the parties set forth in this Section 5.5 shall be unconditional
and absolute and shall remain in effect without limitation as to time.

          (f) SECTION 338(H)(10).

          (i) ELECTION. Sellers shall make a joint election with Purchaser under
     Section 338(h)(10) of the Code and under any similar provisions of state or
     foreign law (each a "SECTION 338(H)(10) ELECTION") with respect to each of
     the Companies (and any Subsidiary of any of them that is treated as a
     corporation under the Code) other than UTP Holdings. Sellers represent that
     the sales of such Companies are eligible for, and Purchaser represents that
     it is qualified to make, such elections. Sellers and Purchaser shall
     exchange complete and executed copies of Internal Revenue Service Form
     8023, required schedules thereto, and any similar state and foreign forms.
     If any changes are required in these forms as a result of information which
     is first available after the applicable Closing Date, the parties will
     promptly agree on such changes. Notwithstanding anything to the contrary in
     this Agreement, Sellers and Purchaser agree that no election under Section
     338(h)(10) of the Code and under any similar state law shall be made with
     respect to UTP Holdings.

          (ii) ALLOCATION OF PURCHASE PRICE. Sellers and Purchaser will agree to
     an allocation of the purchase price (in accordance with relative fair
     market values and consistent with Schedules 2.2(b) and 2.4(b) and Section
     2.8(f)) among the assets of the Companies that are deemed to have been
     acquired pursuant to Section 338(h)(10) of the Code or any state or foreign
     law equivalent and among the UTP Holdings Shares, the CIPC Shares, the
     Conveyed Properties and the Product Inventory (the Final Product Inventory
     Purchase Price being allocated to the Product Inventory). Purchaser will
     prepare the initial draft of such purchase price allocation. Purchaser and
     Sellers shall use the asset values determined from such agreed-upon
     allocation for purposes of all reports and returns with respect to Taxes,
     including Internal Revenue Service Form 8594 or any equivalent statement.

          (g) POSSIBLE EXCHANGE. The parties may elect to structure one or
more of these transactions as a like-kind exchange pursuant to Section 1031
of the Code. If Sellers are entitled to receive cash pursuant to this Agreement
(or pursuant to the exercise by any third party of any preferential purchase
rights to purchase where such right becomes exercisable by reason of this
Agreement), Sellers may assign their rights under this Agreement to a qualified
intermediary, and have Purchaser transfer the cash directly to the qualified
intermediary, to the extent necessary to enable the Sellers to consummate a
deferred like-kind exchange by directing the qualified intermediary to reinvest
the cash in

                                       48

<PAGE>

like-kind property. The parties agree to execute all documents,
conveyances or other instruments reasonably necessary to effectuate such a
deferred like-kind exchange.

          (h) CONSOLIDATED TAX RETURNS. Notwithstanding any other provision of
this Agreement, (i) Sellers and their Affiliates shall not be required to
provide any Person with any consolidated, combined or unitary Tax Return or copy
thereof that includes any of Sellers and their Affiliates (other than any entity
transferred directly or indirectly to Purchaser by any of Sellers and their
Affiliates hereunder) and (ii) Purchaser and its Affiliates shall not be
required to provide any Person with any consolidated, combined or unitary Tax
Return or copy thereof that includes Purchaser or any of its Affiliates;
PROVIDED, HOWEVER, that to the extent that such Tax Returns would be required to
be delivered but for this Section 5.5(h), the Person that would be required to
deliver such Tax Returns shall instead deliver pro formas relating solely to the
Companies, the AMI Conveyed Properties, the AMI Conveyed Contract, the Alpine
Rights-of-Way, the Product Inventory or CIPC, as the case may be.

          (i) CONSOLIDATED TAX PROCEEDINGS. Notwithstanding any other provision
of this Agreement, (i) Sellers and their Affiliates shall be entitled to
control, and Purchaser shall not be entitled to participate in, any Tax
Proceeding with respect to any consolidated, combined or unitary Tax Return that
includes any of Sellers and their Affiliates (other than any entity transferred
directly or indirectly to Purchaser by any of Sellers and their Affiliates
hereunder) and (ii) Purchaser and its Affiliates shall be entitled to control,
and Sellers and their Affiliates shall not be entitled to participate in, any
Tax Proceeding with respect to any consolidated, combined or unitary Tax Return
that includes Purchaser or any of its Affiliates (other than any entity
transferred directly or indirectly to Purchaser by any of Sellers and their
Affiliates hereunder).

          (j) TAX BASIS AND SECTION 754 ELECTION REPRESENTATION. Sellers make
the following representations and warranties to Purchaser: (i) Schedule 5.5(j)
hereto sets forth the tax basis under the Code of UTP Holdings (or its
Subsidiary), as of December 31, 1999, in its partnership interest in Colville
River Unit and the corresponding share of UTP Holdings (or its Subsidiary) in
Colville River Unit's basis in Colville River Unit's assets; and (ii) in the
case of each transfer hereunder that is, for purposes of the Code, a transfer of
an interest that is, or has been treated as, a partnership interest under the
Code, each relevant partnership (other than any partnership interest in the
Colville River Unit and any partnership interest to which no value is allocated
by the parties pursuant to Section 5.5(f)(ii)) has made (or will make) a valid
election under Section 754 of the Code that will apply to such transfer.

          (k) In the case of any Subsidiary of a Company that is treated as a
corporation under the Code, the principles of this Section 5.5 shall apply as if
such

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<PAGE>

Subsidiary were a Company. The principles of this Section 5.5 shall also
apply to any intellectual property sold to Purchaser pursuant to Section 5.15
hereof.

          Section 5.6 EMPLOYEES AND EMPLOYEE BENEFITS. The parties hereby agree
to all of the provisions set forth in Schedule 5.6 of the Disclosure Schedule,
as amended as of April 6, 2000, with respect to Personnel and employee
compensation and benefits.

          Section 5.7   INDEBTEDNESS.

          (a) Except as set forth in Section 5.7(b), Sellers shall cause
each Company to repay all existing indebtedness of each Company for borrowed
money prior to the applicable Closing with respect to such Company. Sellers
shall cause the Contracts solely between ARCO or any Affiliate of ARCO that is
not a Company, on the one hand, and any Company, on the other hand, other than
the Contracts identified on Schedule 5.7(a) of the Disclosure Schedule and
except as provided by Section 5.15, to be terminated as of the applicable
Closing Date with respect to such Company.

          (b) Notwithstanding Section 5.7(a), Sellers shall have no
obligation prior to the Second Closing to cause the repayment of the
$265,000,000 principal amount of City of Valdez, Alaska Marine Terminal Revenue
Refunding Bonds, Series A, B & C 1994, due 2031 (the "BONDS") for which ATAI is
the primary obligor and ARCO has guaranteed payment. No later than eighteen
months from the Second Closing Date, Purchaser shall cause the Bonds then
outstanding, together with all interest and other amounts then due and payable
thereunder, to be paid in full, or provision for payment thereof to be made, so
that the existing guarantees delivered by ARCO in respect of such Bonds (the
"GUARANTEES") shall terminate and ARCO, as guarantor, shall cease to have any
continuing liability or obligation with respect to any Bonds, or any refunding
thereof, and the Guarantees shall be delivered to ARCO by the trustee for the
Bonds marked cancelled. Purchaser's ability to refund or reissue the Bonds shall
not be a condition to Purchaser's obligations with respect to repayment of the
Bonds within the foregoing period. Purchaser shall forever indemnify and hold
harmless the Seller Indemnified Parties for any demand for payment, loss, claim,
liability, damages, costs or expenses asserted against, or incurred by, ARCO as
Guarantor of the Bonds or of ATAI's obligations, or any of ARCO's Affiliates, in
respect of any failure to pay principal or interest under the Bonds or any other
default with respect to the Bonds, or any reissue or refunding thereof, arising
after the Second Closing Date. ARCO shall procure that, prior to the Second
Closing, (i) for Bonds issued in the Variable Rate Mode (as defined in the
applicable Indenture), ATAI shall not cause any of the Bonds to be converted to
any interest rate mode such that the Bonds bear interest at a Quarterly,
Semiannual, Term or Fixed Rate (as defined in the applicable Indenture), and
(ii) for Bonds issued in the Flexible Rate Mode (as defined in the applicable
Indenture), ATAI shall request the Remarketing Agent (as defined in the
applicable Indenture) to use commercially reasonable efforts to market the Bonds
for

                                       50

<PAGE>

Flexible Rate Periods (as defined in the applicable Indenture) not exceeding
90 days and (iii) ATAI shall not issue Bonds in the Fixed Rate Mode (as defined
in the applicable Indenture). The time period referred to in the second sentence
of this Section 5.7(b) may be extended by mutual agreement of ARCO and Purchaser
but shall not extend for more than two years in total.

          Section 5.8 FURTHER ASSURANCES. At any time after a Closing Date,
Sellers and Purchaser shall, and Purchaser shall cause each Company that after
such Closing Date is a Subsidiary of Purchaser to, promptly execute, acknowledge
and deliver any other assurances or documents reasonably requested by Sellers or
Purchaser, as the case may be, and necessary for Sellers or Purchaser, as the
case may be, to satisfy its respective obligations hereunder or under the
Provisional Consent Order or any final order of the FTC in respect thereof or
obtain the benefits contemplated hereby.

          Section 5.9 CERTAIN TRANSACTIONS. Purchaser agrees that it shall
not, and shall not permit any of its Affiliates to (i) acquire or agree to
acquire any assets, (ii) acquire or agree to acquire, whether by merger,
consolidation, by purchasing a substantial portion of the assets of or equity
in, or by any other manner, any Person or division thereof, if the entering into
of a definitive agreement relating to or the consummation of such acquisition,
merger or consolidation could reasonably be expected to (A) impose any material
delay in the expiration or termination of any applicable waiting period or
impose any material delay in the obtaining of, or significantly increase the
risk of not obtaining, any Governmental Authorization, including the Provisional
Consent Order, any final order of the FTC in respect thereof, the State Consent
Order and the Charter, (B) significantly increase the risk of any Governmental
Entity entering an order prohibiting the consummation of the transactions
contemplated hereby, (C) significantly increase the risk of not being able to
remove any such order on appeal or otherwise or (D) materially delay or impede
the consummation of the transactions contemplated hereby, or (iii) take any
action that could reasonably be expected to result in any modification to the
Provisional Consent Order by the FTC that would be adverse to Sellers or would
require any indemnification by ARCO pursuant to Section 8.3(f) or the withdrawal
of the Provisional Consent Order by the FTC.

          Section 5.10 CHARTER OBLIGATIONS.

          (a) Purchaser acknowledges that ARCO Alaska and BP Exploration are
each parties to the Charter and that the Charter requires both and each of ARCO
Alaska and BP Exploration to undertake certain commitments, some of which are
associated with the ownership or operation of the Properties of the Companies,
some of which are associated with the ownership or operation of properties owned
by BP Exploration and some of which are general in nature.

                                       51

<PAGE>

          (b) Notwithstanding anything in this Agreement to the contrary, as
between ARCO and Purchaser, Purchaser shall assume all obligations of ARCO
Alaska for complying with the Charter commitments to the extent such commitments
are associated with the ownership or operation of the Properties of the
Companies or the Conveyed Properties, ARCO shall be responsible for complying
with the Charter commitments to the extent such commitments are associated with
the ownership or operation of the properties retained by BP Exploration, and
ARCO and Purchaser shall each be separately responsible, and Purchaser shall
assume such responsibility, for all other Charter commitments in equal measure,
subject only to the following clarifications and exceptions:

          (i) The commitment of BP Exploration and ARCO Alaska with respect to
     purchasing crude oil under Charter paragraph I.G. shall be allocated
     entirely to ARCO.

          (ii) The commitment of BP Exploration and ARCO Alaska with respect to
     natural gas volume under Charter paragraph I.J. shall be allocated between
     ARCO and Purchaser based upon BP Exploration's and ARCO Alaska's
     then-allocated share of gas reserves of the Prudhoe Bay (Permo-Triassic)
     Reservoir.

          (iii) The commitment of BP Exploration and ARCO Alaska with respect to
     orphan sites under Charter paragraph II.A.1. shall be allocated entirely to
     ARCO.

          (iv) The commitment of BP Exploration and ARCO Alaska with respect to
     clean up of sites and reserve pits under Charter paragraphs II.A.3 and
     II.A.4. shall be allocated between ARCO and Purchaser based upon the
     specific party designations in Charter Exhibits D.2., D.3.A. and D.3.B.

          (v) The commitment of BP Exploration and ARCO Alaska with respect to
     unspent funds under Charter paragraph II.A.8. shall be allocated between
     ARCO and Purchaser in the same proportion as in the allocations previously
     established for the relevant provisions of Charter paragraph II.A to which
     paragraph II.A.8 refers.

          (vi) The commitment of BP Exploration and ARCO Alaska with respect to
     establishing and funding a charitable entity under Charter paragraph II.D.
     shall be allocated between ARCO and Purchaser in proportion to their
     respective share of Alaska liquids production and based upon the assumption
     that each will establish a separate entity.

          (vii) The commitment of BP Exploration and ARCO Alaska with respect to
     annual reporting under Charter paragraph II.E. shall be accomplished by

                                       52

<PAGE>

     separate reporting by each of ARCO and Purchaser concerning their
     respective allocated shares of the Charter commitments.

          (viii) The commitment of BP Exploration and ARCO Alaska to pay
     Alaska's attorneys' fees under Charter paragraph V.G. shall be allocated
     entirely to ARCO.

In fulfilling its obligations hereunder, Sellers and Purchaser shall each comply
with applicable laws.

          Section 5.11 SELLERS' TRADE NAMES, ETC. Effective as of the applicable
Closing Date with respect to each Company, any license agreement pursuant to
which Sellers or any Affiliate of Sellers have granted to any Company the right
to use trademarks, trade names or logos that include the word "ARCO" shall be
terminated. As promptly as is practicable after the applicable Closing,
Purchaser shall cause each such Company to eliminate the word "ARCO" and every
word or expression derived therefrom from (a) its certificate of incorporation
and other organizational documents and (b) the names under which it does
business. Within 90 days after the applicable Closing, Purchaser shall cause
each Company to remove any such trademarks, trade names and logos from its
respective properties, stationery and literature, and thereafter neither
Purchaser nor any Company shall use any such trademarks, trade names or logos.

          Section 5.12 GUARANTEE.  Effective upon the consummation of the BP
Amoco/ARCO Merger as provided in the Merger Agreement, BP Amoco hereby
unconditionally guarantees to Purchaser the prompt, faithful and full
performance of all of the covenants and obligations of each Seller under this
Agreement.

          Section 5.13 INSURANCE MATTERS. ARCO shall maintain insurance
coverage with respect to each Company and the Conveyed Properties generally in a
manner consistent with its past practice and overall insurance program for ARCO
until the applicable Closing Date with respect to such Company or Conveyed
Properties. From the ARCO Marine Transfer Date until the First Closing, ARCO
agrees to maintain the ARCO excess general liability insurance program, insuring
ARCO, its subsidiaries and divisions, in a manner consistent with ARCO's past
practice. Purchaser acknowledges that upon the ARCO Marine Transfer Date, the
excess comprehensive general liability insurance including tanker vessel
pollution coverage maintained as part of the insurance coverage for ARCO and its
subsidiaries may no longer be available with respect to the operations of ARCO
Marine. Commencing on the ARCO Marine Transfer Date until the First Closing,
Purchaser shall maintain insurance coverage for the AMI Conveyed Properties and
the ARCO Trader, and for risks with respect to the operations of ARCO Marine,
with an insurer which is a member of the International Group of Protection and
Indemnity Associations, at the same or better level of coverage as ARCO
maintained with the American Steamship Owners Mutual Protection and Indemnity
Association, Inc. ("ASO")

                                       53

<PAGE>

for the ARCO Trader, AMI Conveyed Properties and ARCO Marine immediately prior
to the ARCO Marine Transfer Date. If Purchaser uses an insurer other than ASO,
Purchaser will reimburse ARCO for 50% of any termination penalty, release call
or other calls related to termination made against ARCO by ASO, subject to a
maximum reimbursement by Purchaser of $1 million, and ARCO will reimburse
Purchaser for 50% of any termination penalty, release call or other calls
related to termination made against ARCO Marine by ASO. Sellers and Purchaser
acknowledge that as and when insurance policies expire or are renewed, it may
not be possible to maintain the same insurance coverage either in kind or amount
as may be in place as of the date of this Agreement. From and after the
applicable Closing Date with respect to the Shares of each Company and the
Conveyed Properties, Purchaser shall solely be responsible for providing such
insurance coverage as it may in its sole judgment determine to be appropriate
which respect to occurrences and claims arising after such Closing Date with
respect to each Company and the Conveyed Properties, as the case may be. With
respect to claims arising after the applicable Closing Date, including claims
made after such Closing Date for Losses occurring prior to the relevant Closing
Date but insured on a "claims made" basis, Purchaser shall have no separate or
independent claim against or interest in insurance policies of ARCO and ARCO's
Subsidiaries (without prejudice to the Sellers' submission of claims in
conformity with the provisions of this Section) with respect to losses or claims
related to occurrences prior to the applicable Closing Date. Schedule 5.13 lists
insurance policies that provide occurrence coverage to ARCO which may be
available to Purchaser to respond to claims arising out of occurrences prior to
the applicable Closing Date. Sellers acknowledge that there may be additional
policies which may provide some coverage with respect to losses or claims
related to occurrences prior to the applicable Closing Date. Sellers agree to
cooperate on a reasonable basis with Purchaser, at Purchaser's expense, with
respect to identifying any such policies and will, as appropriate, tender,
submit or present claims with respect to such policies, provided that Sellers
may in their sole discretion decline to tender, submit or present any such claim
if acceptance or processing of any such claim by the relevant insurance carrier
or provider would result in any economic cost or charge to Sellers or any
Subsidiary or Affiliate of Sellers (including as a result of policies written by
or agreements by Subsidiaries or Affiliates of the Sellers or policies that are
experience rated, fronted or otherwise recapture all or a portion of any
recovery from the insured or policy holder through subsequent premium
adjustments or charges), provided Sellers shall submit or present any such claim
should Purchaser agree to hold Sellers harmless from any such economic cost or
charge unless, in the reasonable judgment of Sellers, any such agreement of
Purchaser would be insufficient to prevent an adverse effect on a Seller.
Sellers do not represent or warrant that coverage under such policies would be
available to cover a loss sustained by Purchaser in any particular instance or
generally. Any coverage under any such policy would be subject to the terms and
conditions of such policies and rules of the relevant underwriter.

          Section 5.14 LONG-TERM SUPPLY CONTRACTS. Simultaneous with the
execution and delivery of this Agreement, Purchaser has entered into an
agreement with

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<PAGE>

BP Oil Supply Company providing for the assignment of the rights and obligations
of BP Oil Supply Company under each of the crude oil supply agreements
identified on Schedule 5.14 of the Disclosure Schedule (each, a "LONG-TERM
SUPPLY CONTRACT") to Purchaser subject to the terms and conditions stated in
such agreement.

          Section 5.15 CERTAIN INTELLECTUAL PROPERTY.

          (a) On or prior to the time of the applicable Closing Date, ARCO
agrees to convey to Purchaser:

          (i) by means of the sale, transfer, assignment, conveyance and
     delivery to Purchaser of the ARCO Alaska Shares, the ATAI Shares, the
     Kuparuk Shares, the Oliktok Shares, the Alpine Shares, the ARCO Marine
     Shares and the UTP Holdings Shares, the intellectual property, inventions,
     technology, trademarks, trade names, trade secrets, copyrights, know-how,
     research material, technical information, seismic data, geological data,
     geophysical data, management information systems, software and software
     specifications, designs, drawings, plans (whether proposed or tentative,
     whether adopted, pending or implemented), specifications, processes and
     quality control data that, as of the date that the Consent Agreement is
     signed, are owned, in whole or in part (but only to the extent of such
     part), by or has been assigned to any ARCO Alaska Company, including any
     special analyses, interpretations and other derivatives from proprietary
     seismic, geological and geophysical data owned by ARCO Alaska relating to
     any hydrocarbons in Alaska or the geology of Alaska (the "ARCO ALASKA
     INTELLECTUAL PROPERTY"), PROVIDED, HOWEVER, that ARCO Alaska Intellectual
     Property shall not include the ARCO Patents or any proprietary trade names
     or trademarks of ARCO;

          (ii) all patents, patent applications and inventions that, as of the
     date the Consent Agreement is signed, are owned, in whole or in part (but
     only to the extent of such part), by ARCO and primarily related to ARCO
     Alaska Businesses or otherwise primarily used by, for or in connection with
     an ARCO Alaska Company, in each case subject to any licenses to or other
     agreements with third parties in effect as of the date the Consent
     Agreement is signed (the "ARCO Patents"); and

          (iii) all proprietary seismic, geological and geophysical data that,
     as of the date that the Consent Agreement is signed, are owned, in whole or
     in part (but only to the extent of such part), by ARCO or its Subsidiaries
     relating to any hydrocarbons in Alaska or the geology of Alaska (the "ARCO
     SEISMIC DATA").

          (b) On or prior to the First Closing Date, ARCO and Purchaser shall
enter into a license agreement for the ARCO Intellectual Property pursuant to
which

                                       55

<PAGE>

ARCO will grant to Purchaser a fully paid up, irrevocable non-exclusive
license, for use of the ARCO Intellectual Property in connection with the
operation in any manner by Purchaser of the ARCO Alaska Businesses (excluding
for this purpose clause (d) of the definition of ARCO Alaska Businesses) as
existing as of the date the Consent Agreement is signed and reasonably
foreseeable extensions thereof, subject to any restrictions on the transfer or
license of any such ARCO Intellectual Property arising under any agreement with
a third party. ARCO shall cooperate with Purchaser and use reasonable best
efforts to assist Purchaser in obtaining a waiver, consent or license, as
applicable, for any such restricted ARCO Intellectual Property (or the benefits
equivalent thereto), the expense of any such license or equivalent benefits to
be borne by Purchaser. For the purposes of this Agreement, "ARCO INTELLECTUAL
PROPERTY" means intellectual property, inventions, technology, trademarks, trade
names, trade secrets, patents, copyrights, know-how, research material,
technical information, management information systems, software and software
specifications, designs, drawings, plans (whether proposed or tentative, whether
adopted, pending or implemented), specifications, processes and quality control
data that, as of the date the Consent Agreement is signed, are owned, in whole
or in part (but only to the extent of such part), by ARCO or its Subsidiaries
(excluding each ARCO Alaska Company), and either are licensed by ARCO or such a
Subsidiary to an ARCO Alaska Company or are otherwise primarily used in, for or
connected with the ARCO Alaska Businesses as of the date the Consent Agreement
is signed, including, without limitation, all information, technology, know-how,
research and other intangible assets and expertise used in connection with the
ARCO Alaska Businesses related to miscible injection for enhanced oil recovery
and technology related to unconsolidated sands, PROVIDED, HOWEVER, that "ARCO
Intellectual Property" shall not include ARCO Patents, ARCO Seismic Data, ARCO
Geoscience and Reservoir Intellectual Property or any proprietary trade names or
trademarks of ARCO.

          (c) On or prior to the First Closing Date, ARCO and Purchaser shall
enter into a license agreement for the ARCO Geoscience and Reservoir
Intellectual Property pursuant to which ARCO will grant to Purchaser a fully
paid-up, irrevocable non-exclusive license, for use of the ARCO Geoscience and
Reservoir Intellectual Property in connection with the operation in any manner
by Purchaser of the ARCO Alaska Businesses (excluding for this purpose clause
(d) of the definition of ARCO Alaska Businesses) as existing as of the date the
Consent Agreement is signed and reasonably foreseeable extensions thereof,
subject to any restrictions on the transfer or license of any such ARCO
Geoscience and Reservoir Intellectual Property arising under any agreement with
a third party and subject to the rights of any third parties under licenses
previously granted by ARCO. ARCO shall cooperate with Purchaser and use
reasonable best efforts to assist Purchaser in obtaining a waiver, consent or
license, as applicable, for any such restricted ARCO Geoscience and Reservoir
Intellectual Property (or the benefits equivalent thereto), the expense of any
such license or equivalent benefits to be borne by Purchaser. For the purposes
of this Agreement, "ARCO GEOSCIENCE AND RESERVOIR INTELLECTUAL PROPERTY" means
all technical information, patents, computer programs and

                                       56

<PAGE>

code, including all supporting manuals and documentation that, as of the date
the Consent Agreement is signed, are owned, in whole or in part (but only to the
extent of such part), by ARCO or its Subsidiaries (excluding each ARCO Alaska
Company) and used in or connected with the ARCO Alaska Businesses and related to
(1) modeling and simulation of subsurface hydrocarbon reservoirs, (2)
interpreting seismic, geological and geophysical data and reservoir data, (3)
optimizing facilities, and (4) drilling and producing hydrocarbons. Such ARCO
Geoscience and Reservoir Intellectual Property includes, but is not limited to:
(a) geophysical techniques employing elastic impedance seismic inversion
technology; (b) reservoir simulation computer models (known as "ACRES"); (c)
enhanced oil recovery and fluid characterization technology; (d) geomechanical
modeling; (e) fluid flow ("ARCO90") relative permeability technology; and (e)
analytical reservoir measurement techniques.

          (d) On or prior to the First Closing Date, ARCO and Purchaser shall
enter into a license agreement pursuant to which Purchaser will grant to ARCO a
fully paid up, irrevocable non-exclusive license for use of the ARCO Patents
worldwide. Such license will permit sublicenses to third parties.

          (e)  ARCO shall cooperate with Purchaser and use reasonable best
efforts to assist Purchaser in obtaining a license for any Third Party
Intellectual Property (or the benefits equivalent thereto), the expense of any
such license or equivalent benefits to be borne by Purchaser. For the purposes
of this Agreement, "THIRD PARTY INTELLECTUAL PROPERTY" means intellectual
property, inventions, technology, trademarks, trade names, trade secrets,
patents, copyrights, know-how, research material, technical information,
management information systems, software and software specifications, designs,
drawings, plans (whether proposed or tentative, whether adopted, pending or
implemented), specifications, processes and quality control data that, as of the
date the Consent Agreement is signed, are owned by a party other than ARCO or
any of its Subsidiaries but are licensed to ARCO or its Subsidiaries (excluding
for this purpose each ARCO Alaska Company) and are primarily used in, for or
connected with the ARCO Alaska Businesses (excluding for this purpose clause (d)
of the definition of ARCO Alaska Businesses).

          Section 5.16 SUBSTITUTION OF GUARANTOR. Purchaser agrees that in
connection with and at the time of the applicable Closing, Purchaser will be
substituted for ARCO or any Subsidiary of ARCO as the guarantor (or other party
providing support or assurances for the obligations of any Company) with respect
to all operating and performance guarantees, sureties, support and similar
obligations theretofore assumed by ARCO or such Subsidiary with respect to a
Company or, in the event that any required consent or approval for such
substitution is not obtained, will indemnify ARCO and its Affiliates in respect
of any liabilities incurred by them in respect of such obligations.

          Section 5.17 TRANSITIONAL SERVICES. After the execution of this
Agreement, ARCO and Purchaser will negotiate in good faith to conclude, and
prior to

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<PAGE>

Closing shall enter into, agreements, in forms to be agreed upon by the parties,
for the provision of transitional services with respect to the Companies and the
AMI Conveyed Properties. Such agreements shall provide that Purchaser will pay
ARCO fees for such services (a) at the rate or rates currently charged or
allocated by ARCO to ARCO Alaska for internal accounting purposes or in the most
recent budget for ARCO Alaska or (b) in the case of services for which there is
no historical charge or allocation, at a rate or rates, to be mutually agreed by
ARCO and Purchaser in good faith, reflecting the cost to ARCO of providing such
services.

          Section 5.18 DESIGNATION OF TRANSFEREE. In its sole discretion,
Purchaser shall be permitted to direct that any of the Shares the Conveyed
Properties or the Product Inventory that Purchaser is entitled to receive
hereunder be delivered directly to any Affiliate of Purchaser; PROVIDED that
such direction shall be given to Sellers prior to the filing by Sellers of any
application with any Governmental Entity for approval of the transfer of the
Shares or the Conveyed Properties in question to Purchaser, but in any event
Purchaser shall not be required to give such direction to Sellers prior to the
third Business Day after the date of the first public announcement of this
Agreement; and PROVIDED, FURTHER, that any such direction shall not affect the
obligations of Purchaser hereunder.

          Section 5.19 PREPARATION OF FINANCIAL STATEMENTS. Prior to and
subsequent to the Closing, Sellers will cooperate with Purchaser to prepare such
audited financial statements for the Companies on a combined basis as the
Securities and Exchange Commission may require.

          Section 5.20 ORDER TO HOLD SEPARATE AND MAINTAIN ASSETS.
Notwithstanding anything to the contrary contained in this Agreement, Sellers
shall not be required to perform any covenant or agreement herein, and the
failure to perform any such covenant or agreement shall not constitute a breach
of this Agreement by Sellers, if the performance of such covenant or agreement
would violate, or the performance of such covenant or agreement shall not be
within the control of Sellers as a result of, any order to hold separate and
maintain assets issued by the FTC.

          Section 5.21  ARCO DIRECTORS AND OFFICERS.

          (a) On or prior to the ARCO Marine Transfer Date, in the case of ARCO
Marine, on or prior to the First Closing Date, in the case of ARCO Alaska, UTP
Holdings and ARCO Beluga, and on or prior to the Second Closing Date, in the
case of ATAI, Kuparuk, Oliktok, Alpine and CIPC, Sellers shall deliver or cause
to be delivered to Purchaser letters of resignation from each director and
officer of such Company and any wholly owned Subsidiary of such Company and, in
the case of CIPC, from any

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<PAGE>

director of CIPC who was nominated to such position by ARCO, such resignations
to be effective on the Closing Date applicable to each such Company.

          (b) From and after the Closing Date applicable to each Company,
Purchaser shall not take any action that would eliminate, reduce, limit or
otherwise modify the indemnification available to any present or former director
or officer of such Company or any of its Subsidiaries, if applicable, determined
as of the relevant Closing (collectively, the "ARCO DIRECTORS AND OFFICERS"),
whether such indemnification is provided pursuant to such Company's certificate
of incorporation, by-laws or other organizational document, indemnification
agreements, or otherwise.

          (c) If Purchaser or any of its successors or assigns (i) shall
consolidate with or merge into any other Person and shall not be the continuing
or surviving corporation or entity of such consolidation or merger or (ii) shall
transfer all or substantially all of its properties and assets to any Person,
then, and in each such case, proper provisions shall be made so that the
successors and assigns of Purchaser shall assume all of the obligations set
forth in this Section 5.21.

          (d) The provisions of this Section 5.21 are intended to be for the
benefit of, and shall be enforceable by, each of the ARCO Directors and
Officers, their heirs and their representatives.

          Section 5.22  MARINE.

          (a) AMI CONVEYED CONTRACT. Purchaser acknowledges that certain ARCO
Marine employees are currently responsible for the management and oversight of
the AMI Conveyed Contract and the construction program implemented pursuant
thereto. Purchaser agrees that during the period beginning on the ARCO Marine
Transfer Date and ending on the Second Closing Date, Purchaser shall, and shall
cause ARCO Marine (i) to continue to manage and maintain oversight of the AMI
Conveyed Contract and the construction program implemented pursuant thereto in a
manner consistent with the practices of ARCO Marine prior to such delivery of
the ARCO Marine Shares and (ii) not to amend the engineering design,
construction process or any terms of the AMI Conveyed Contract without the prior
written consent of AMI.

          (b) BAREBOAT CHARTERS.

          (i) During the period beginning on the ARCO Marine Transfer Date and
     ending on the First Closing Date, Purchaser shall not permit ARCO Marine to
     terminate, and shall cause ARCO Marine to perform its obligations under,
     (A) each of the bareboat charters between AMI and ARCO Marine then in
     effect for each of the AMI Conveyed Properties (collectively, the "BAREBOAT
     CHARTERS") and

                                       59

<PAGE>

     (B) the bareboat charter between Attransco, Inc. and ARCO
     Marine then in effect for the ARCO Trader.

          (ii) In connection with the First Closing, ARCO shall cause AMI to
     terminate each of the Bareboat Charters when the relevant AMI Conveyed
     Property is delivered, at a time mutually agreed upon as provided in
     Section 2.2(b)(iii). Should the parties be unable to agree on a mutually
     acceptable time, then such delivery of the relevant AMI Conveyed Property
     and termination of the applicable Bareboat Charter shall be at the time of
     the First Closing as provided in Section 2.2(a). Purchaser acknowledges and
     agrees that ARCO Marine has as of the date hereof waived any requirement of
     notice of such termination under any Bareboat Charter and further agrees
     that upon and after the delivery of the ARCO Marine Shares to Purchaser in
     accordance with Section 2.6(b)(vi) such waiver shall remain in effect.

          (c) TIME CHARTERS.

          (i) During the period beginning on the ARCO Marine Transfer Date and
     ending on the First Closing Date, Purchaser shall not permit ARCO Marine to
     terminate, and shall cause ARCO Marine to perform its obligations under,
     each of the time charters between ARCO Marine and ARCO Products Company
     then in effect for each of the AMI Conveyed Properties and the ARCO Trader
     (the "ARCO PRODUCTS TIME CHARTERS").

          (ii) ARCO shall cause the termination of each of the ARCO Products
     Time Charters, effective simultaneously with the termination of the
     Bareboat Charters in accordance with Section 5.22(b).

          (d) RECONVEYANCE. In the event that the ARCO Marine Shares shall have
been delivered to Purchaser in accordance with Section 2.6(b)(vi) and thereafter
this Agreement shall be terminated prior to the First Closing, then upon the
demand(s) of and at the time(s) designated by ARCO (which time(s) shall be as
promptly as practicable after obtaining the relevant approval(s) of the Maritime
Administration, the application(s) for which shall be made by ARCO no later than
five business days after such termination of this Agreement), (i) Purchaser
shall cause ARCO Marine to assign, for no consideration, all of the rights and
obligations of ARCO Marine under each of the Bareboat Charters and the bareboat
charter for the ARCO Trader to ARCO's designee(s), (ii) Purchaser shall deliver
possession of the AMI Conveyed Properties and the ARCO Trader to ARCO's
designee(s), (iii) Purchaser and ARCO shall cause termination without penalty of
each of the ARCO Products Time Charters, (iv) Purchaser shall transfer, assign,
convey and deliver to ARCO or, at ARCO's option, ARCO's designee, for no
consideration, the ARCO Marine Shares, duly endorsed in blank or accompanied by
stock powers duly executed in blank, in proper form for transfer and with any
requisite stock transfer stamps

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properly affixed thereto, and (v) if such assignments, deliveries and
terminations contemplated by clauses (i), (ii), (iii) and (iv) have been made,
ARCO will indemnify, defend and hold harmless the Purchaser Indemnified Parties
from, against and in respect of any (x) Losses imposed on, sustained, incurred
or suffered by or asserted against any of the Purchaser Indemnified Parties, to
the extent arising out of the operation of ARCO Marine prior to delivery of the
ARCO Marine Shares to Purchaser, and (y) Losses (including those related to
personal injuries, property damage, or any actual or threatened discharge of
oil), relating to or arising out of any of the AMI Conveyed Properties or the
ARCO Trader, or Purchaser's bareboat chartering or operating any such vessel
after the ARCO Marine Transfer Date to the extent that such Losses exceed the
coverage which Purchaser is required to maintain pursuant to Section 5.13;
PROVIDED, HOWEVER, that this clause (y) shall not apply to any Losses arising
out of or related to the gross negligence or willful misconduct of any Purchaser
Indemnified Party. Notwithstanding anything in this Agreement to the contrary,
this Section 5.22(d) shall survive indefinitely.

                                   ARTICLE VI
                              CONDITIONS TO CLOSING

          Section 6.1 CONDITIONS TO THE OBLIGATIONS OF PURCHASER AND SELLERS
WITH RESPECT TO THE FIRST CLOSING. The obligations of the parties hereto to
effect the First Closing are subject to the satisfaction (or waiver by Purchaser
and Sellers) prior to the First Closing of the following conditions:

          (a) GOVERNMENTAL CONSENTS. (i) The Provisional Consent Order shall
have been issued by the FTC, (ii) the State Consent Order shall have been
issued, (iii) any applicable waiting period under the HSR Act shall have been
terminated and (iv) all Required Governmental Consents (other than any Required
Governmental Consent that relates only to the sale, transfer, assignment and
conveyance of the Pipeline Assets) shall have been obtained or made.

          (b) LITIGATION. No court or other Governmental Entity of competent
jurisdiction shall have enacted, issued, promulgated, enforced or entered any
Law or Order that is in effect and enjoins or otherwise prohibits consummation
of the transactions contemplated by Sections 2.2(a) and 2.2(b).

          (c) BP AMOCO/ARCO MERGER. The BP Amoco/ARCO Merger shall have been
consummated; PROVIDED, HOWEVER, that Purchaser acknowledges and agrees that,
notwithstanding anything to the contrary contained in this Agreement, neither
ARCO nor BP Amoco shall have any obligation to Purchaser under the terms of this
Agreement or otherwise to (i) complete the BP Amoco/ARCO Merger or (ii) take any
action or refrain from taking any action to consummate the BP Amoco/ARCO Merger.

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          (d) ARCO shall have caused AMI to terminate the Bareboat Charters
pursuant to Section 5.22(b)(ii).

          (e) ARCO shall have caused the termination of the ARCO Products Time
Charters in accordance with Section 5.22(c).

          Section 6.2 CONDITIONS TO THE OBLIGATIONS OF PURCHASER WITH RESPECT TO
THE FIRST CLOSING. The obligation of Purchaser to effect the First Closing is
subject to the satisfaction (or waiver by Purchaser) prior to the First Closing
of the following conditions:

          (a) REPRESENTATIONS AND WARRANTIES. The representations and warranties
of Sellers set forth in this Agreement shall be true and correct (without giving
effect to any qualifications as to "Material Adverse Effect," "material" or
similar qualifications except for any reference to "Material Contracts" and the
references to "material" in Section 3.7) as of the date of this Agreement and on
and as of the First Closing as though made on and as of the First Closing
(except to the extent any such representation or warranty expressly speaks as of
an earlier or different date, and except for changes contemplated or permitted
by the terms hereof) except, in either case, where the failure of such
representations and warranties to be so true and correct (without giving effect
to any qualifications as to "Material Adverse Effect," "material" or similar
qualifications except for any references to "Material Contracts" and the
references to "material" in Section 3.7), individually or in the aggregate,
would not reasonably be expected to have a Material Adverse Effect, and each
Seller shall have delivered to Purchaser a certificate dated as of the First
Closing Date and signed on behalf of such Seller by an executive officer of such
Seller to such effect.

          (b) COVENANTS. The covenants and agreements of Sellers to be performed
on or prior to the First Closing shall have been duly performed in all material
respects, and each Seller shall have delivered to Purchaser a certificate dated
as of the First Closing Date and signed on behalf of such Seller by an executive
officer of such Seller to such effect; PROVIDED that any failure to satisfy the
foregoing condition with respect to any covenant or agreement of Sellers (other
than the agreements set forth in Article II) shall be disregarded and may not be
asserted by Purchaser if and to the extent that (i) ARCO shall agree to
indemnify the Purchaser Indemnified Parties and hold them harmless against any
and all Losses that may arise out of or relate to the failure of Sellers to duly
perform such covenant or agreement in all material respects and (ii) all of such
failures, taken together, do not materially and adversely affect the economic
benefits reasonably expected to be derived by Purchaser from the consummation of
the transactions contemplated hereby.

          (c) DELIVERIES. Purchaser shall have received from Sellers the
certificates and other instruments of transfer, assignment and conveyance
required to be delivered pursuant to Section 2.2(b) hereof.

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          (d) ARCO shall have delivered to Purchaser, at least five Business
Days prior to the First Closing Date, the audited Year-End Financial Statements
referenced in Section 3.7.

          (e) ALPINE PIPELINE. ARCO Alaska and UTA shall have transferred to
Alpine all of the assets, tangible and intangible, which are reflected in the
book value for the alpine pipeline common carrier crude oil pipeline on the
accounting records of ARCO Alaska and UTA, at the date of such asset transfer.
Such transfer at book value is already reflected in the $165 million allocation
in Schedule 5.5(j).

          Section 6.3 CONDITIONS TO THE OBLIGATIONS OF SELLERS WITH RESPECT TO
THE FIRST CLOSING. The obligations of Sellers to effect the First Closing are
subject to the satisfaction (or waiver by Sellers) prior to the First Closing of
the following conditions:

          (a) REPRESENTATIONS AND WARRANTIES. The representations and warranties
of Purchaser set forth in this Agreement shall be true and correct (without
giving effect to any qualifications as to "Material Adverse Effect," "material"
or similar qualifications) as of the date of this agreement and on and as of the
First Closing as though made on and as of the First Closing (except to the
extent any such representation or warranty expressly speaks as of an earlier or
different date, and except for changes contemplated or permitted by the terms
hereof) except, in either case, where the failure of such representations and
warranties to be so true and correct (without giving effect to any
qualifications as to "material adverse effect," "material" or similar
qualifications), individually or in the aggregate, would not reasonably be
expected to have a material adverse effect on Purchaser or materially impair or
delay Purchaser's ability to perform its obligations hereunder, and Purchaser
shall have delivered to Sellers a certificate dated as of the First Closing Date
and signed on behalf of Purchaser by an executive officer of Purchaser to such
effect.

          (b) COVENANTS. The covenants and agreements of Purchaser to be
performed on or prior to the First Closing shall have been duly performed in all
material respects, and Purchaser shall have delivered to Sellers a certificate
dated as of the First Closing Date and signed on behalf of Purchaser by an
executive officer of Purchaser to such effect.

          (c) RECEIPT OF PURCHASE PRICE. Sellers shall have received from
Purchaser the payment required to be made at the First Closing pursuant to
Section 2.2(b) hereof.

          (d) INSTRUMENTS. Purchaser shall have executed all instruments of
transfer, assignment, assumption or conveyance required in connection with the
First Closing.

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          Section 6.4 CONDITIONS TO THE OBLIGATIONS OF PURCHASER AND SELLERS
WITH RESPECT TO THE SECOND CLOSING.

          (a) The obligations of the parties hereto to effect the Second Closing
are subject to the satisfaction (or waiver by Purchaser and Sellers) prior to
the Second Closing of the following conditions:

          (i) Subject to the provisions of Section 2.4(c), all Required
     Governmental Consents and all other Necessary Consents relating to the
     Pipeline Assets shall have been obtained or made.

          (ii) No court or other Governmental Entity of competent jurisdiction
     shall have enacted, issued, promulgated, enforced or entered any Law or
     Order that is in effect and enjoins or otherwise prohibits consummation of
     the transactions contemplated by Sections 2.4(a) and 2.4(b).

          (b)  The obligation of Purchaser to effect the Second Closing is
subject to the satisfaction (or waiver by Purchaser) prior to the Second Closing
of the condition that Purchaser shall have received from Sellers the
certificates and other instruments of transfer, assignment and conveyance
required to be delivered pursuant to Section 2.4(b).

          (c) The obligations of Sellers to effect the Second Closing are
subject to the satisfaction (or waiver by Sellers) prior to the Second Closing
of the following conditions:

          (i) Sellers shall have received from Purchaser the payment required to
     be made at the Second Closing pursuant to Section 2.4(b); and

          (ii) Purchaser shall have executed all instruments of transfer,
     assignment, assumption or conveyance required in connection with the Second
     Closing.

                                  ARTICLE VII
                          CERTAIN ENVIRONMENTAL MATTERS

          Section 7.1 ACKNOWLEDGMENTS.  Purchaser acknowledges that:

          (a) the Properties may currently contain or have in the past contained
asbestos and NORM and that special procedures associated with the assessment,
remediation, removal, transportation or disposal of such asbestos and NORM may
be necessary;

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          (b) the Properties include wells, pipelines, facilities, gravel pads
and roads that may have been temporarily or permanently abandoned;

          (c) the Producing Properties contain reserve pits; and

          (d) Process Safety Management associated with the Properties is an
ongoing process.

          Section 7.2 ASSUMPTION OF OBLIGATIONS.  At and after the applicable
Closing, Purchaser shall have sole responsibility for, agrees to pay any and all
costs and expenses associated with, and on behalf of itself, its Affiliates and
its and their successors and assigns irrevocably waives any and all claims any
of them may have against any Seller Indemnified Party associated with:

          (a) the assessment, remediation, removal, transportation or disposal
of asbestos and NORM associated with any of the Properties, irrespective of when
such costs and expense or claims, as the case may be, may be incurred or may
arise;

          (b) the plugging, abandonment or remediation of all wells, pipelines,
pipeline rights-of-way, facilities and gravel pads and roads associated with any
of the Properties, irrespective of when such costs and expense or claims, as the
case may be, may be incurred or may arise;

          (c)  the abandonment or remediation of the Non-Unit Reserve Pits to
the extent that such costs and expenses or claims, as the case may be, relate to
the ownership or operation of the Producing Properties on and after the
Effective Time;

          (d)  the abandonment or remediation of the Unit Reserve Pits,
irrespective of when such costs and expense or claims, as the case may be, may
be incurred or may arise; and

          (e) Process Safety Management associated with the Properties
(including, without limitation, identification, evaluation and remediation),
irrespective of when such costs and expense or claims, as the case may be, may
be incurred or may arise.

In fulfilling its obligations under this Section, Purchaser shall comply with
applicable Laws.

          Section 7.3  RETENTION OF OBLIGATIONS.  At and after the applicable
Closing, Sellers shall have sole responsibility for, agree to pay any and all
costs and expenses associated with, and on behalf of themselves, their
Affiliates and their successors and assigns irrevocably waive any and all claims
any of them may have against any Purchaser Indemnified Party associated with,
the abandonment and remediation of the Non-Unit Reserve Pits to the extent that
such costs and expenses or claims, as the case

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<PAGE>

may be, relate to the ownership or operation of the Producing Properties prior
to the Effective Time. In fulfilling their obligations under this Section,
Sellers shall comply with applicable Laws.

                                  ARTICLE VIII
             SURVIVAL; INDEMNIFICATION; TITLE AND INSPECTION MATTERS

          Section 8.1  SURVIVAL

          (a)  SURVIVAL OF REPRESENTATIONS AND WARRANTIES. The representations
and warranties of Sellers and Purchaser contained in this Agreement and all
claims and causes of action with respect thereto shall terminate on the date
that is twenty-four months from the First Closing Date; except that (i) any
representation and warranty that expressly relates to a Company or its
Properties, any Shares or any Conveyed Properties that are transferred,
assigned, conveyed and delivered in the Second Closing, and all claims and
causes of action with respect thereto shall survive for a period of twenty-four
months from the Second Closing Date and (ii) the representations and warranties
in Sections 3.1, 3.2, 3.3, 3.4, 3.14, 3.16, 4.1, 4.2, 4.5, 4.7, 4.9, 4.10 and
5.5 shall survive indefinitely.

          (b) SURVIVAL OF COVENANTS AND AGREEMENTS. Each covenant and agreement
of Sellers or Purchaser contained in this Agreement that shall require any part
of its performance after a Closing (excluding the covenants and agreements of
indemnification set forth in Sections 8.2 through 8.7, the survival of which
shall be governed by Section 8.1(c)) shall survive in accordance with the terms
of such covenant or agreement.

          (c) SURVIVAL OF INDEMNIFICATION. The indemnification obligations
provided in Sections 8.2 through 8.7:

          (i) with respect to each representation or warranty referenced in
     Sections 8.2(a) and 8.3(a), shall survive indefinitely unless the
     applicable representation or warranty shall have terminated pursuant to
     Section 8.1(a);

          (ii) with respect to each matter referenced in Sections 8.2(b),
     8.2(c), 8.3(b), 8.3(d) and 8.3(e), shall survive indefinitely;

          (iii) with respect to each matter referenced in Section 8.3(c), shall
     survive for a period of twenty-four months from the First Closing Date;
     PROVIDED that where such matter expressly relates to a Company or its
     Properties, any Shares or any Conveyed Properties that are transferred,
     assigned, conveyed and delivered in the Second Closing, indemnification by
     ARCO with respect to any such matter shall survive for a period of
     twenty-four months from the Second Closing Date;

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          (iv) with respect to each matter referenced in Section 8.3(f), shall
     survive for a period of twelve months from the First Closing Date;

PROVIDED, that such obligations to indemnify the Seller Indemnified Parties or
the Purchaser Indemnified Parties shall not terminate with respect to a
particular item as to which, before the expiration of the applicable survival
period, the party seeking indemnification has made a claim by delivering a
notice of such claim (in accordance with the terms of this Article VIII) to the
party or parties from which indemnification is sought.

          Section 8.2  INDEMNIFICATION BY PURCHASER.  Purchaser hereby agrees
that, subject to the limitations set forth in Sections 8.1 and 8.6, it shall,
and shall cause the Companies (from and after the date that any Company becomes
a Subsidiary of Purchaser) to, indemnify, defend and hold harmless Sellers,
their Affiliates, and, if applicable, their respective directors, officers,
shareholders, partners, attorneys, accountants, agents and employees (the
"SELLER INDEMNIFIED PARTIES") from, against and in respect of any damages,
claims, losses, charges, actions, suits, proceedings, deficiencies, interest,
penalties, and reasonable costs and expenses (including, without limitation,
reasonable attorneys' fees, removal costs, remediation costs, closure costs,
fines, penalties and expenses of investigation and ongoing monitoring), net of
any insurance recovery (collectively, "LOSSES")imposed on, sustained, incurred
or suffered by or asserted against any of the Seller Indemnified Parties, to the
extent arising from:

          (a)  any breach of any representation or warranty (without giving
effect to any qualifications as to "Material Adverse Effect," "material" or
similar qualifications therein) made by Purchaser contained in Article IV;

          (b)  any breach of any covenant or agreement of Purchaser,
including any obligation of Purchaser to assure performance of its Subsidiaries,
contained in this Agreement, including the obligations and commitments of
Purchaser set forth in Sections 5.7(b), 5.10 and 7.2, in each case whether the
matter to which such covenant or agreement relates arose before or after the
Effective Time; and

          (c) any Third Party Claims relating to, arising out of or connected
with, directly or indirectly,

          (i) the ownership or operation of any of the Companies, CIPC, their
     respective Properties, the Conveyed Properties or the Product Inventory or
     any part thereof, on and after the Effective Time; and

          (ii) the ownership or operation of any of the Companies, CIPC, their
     respective Properties, the Conveyed Properties or the Product Inventory, or
     any part thereof, no matter when asserted and whether pertaining to such
     ownership or operation before or after the Effective Time, for which ARCO's
     indemnity

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     obligations shall have terminated (in accordance with Section 8.1
     or otherwise) or for which ARCO has no indemnity obligation hereunder.

          The indemnity and defense obligation set forth in this Section 8.2
shall apply regardless of cause or of any negligent acts or omissions of a
Seller Indemnified Party (including, without limitation, the sole negligence,
concurrent negligence or strict liability of any Seller Indemnified Party).

          Section 8.3 INDEMNIFICATION BY ARCO. ARCO hereby agrees that, subject
to the limitations set forth in Sections 8.1 and 8.6, it shall indemnify, defend
and hold harmless Purchaser, its Affiliates and, if applicable, their respective
directors, officers, shareholders, partners, attorneys, accountants, agents and
employees (the "PURCHASER INDEMNIFIED PARTIES" and, collectively with the Seller
Indemnified Parties, the "INDEMNIFIED PARTIES") from, against and in respect of
any Losses imposed on, sustained, incurred or suffered by or asserted against
any of the Purchaser Indemnified Parties, to the extent arising from:

          (a)  any breach of any representation or warranty (without giving
effect to any qualifications as to "Material Adverse Effect," "material" or
similar qualifications therein except for any references to "Material Contracts"
and the references to "material" in Section 3.7) made by a Seller contained in
Article III;

          (b)  any breach of any covenant or agreement of a Seller contained
in this Agreement, whether the matter to which such covenant or agreement
relates arose before or after the Effective Time;

          (c)  any Third Party Claims relating to, arising out of or
connected with, directly or indirectly, the ownership or operation of any
Company, CIPC, their respective Properties, the Conveyed Properties or the
Product Inventory, or any part thereof, prior to the Effective Time;

          (d)  any assets, liabilities or operations of UTP Holdings
and each of its Subsidiaries prior to the Effective Time other than (i) the
assets, liabilities and operations of UTA at any time and (ii) UTP Holdings'
interest in the income, gains, losses and liabilities of UTA at any time (it
being understood that the foregoing clauses (i) and (ii) shall not limit in any
respect any right of the Purchaser Indemnified Parties to be indemnified with
respect to Losses under any other subsection of this Section 8.3); PROVIDED,
that ARCO shall not indemnify, defend or hold harmless the Purchaser Indemnified
Parties from, against and in respect of any Losses for which Purchaser is
required to indemnify the Seller Indemnified Parties pursuant to this Agreement;

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          (e)  "quality bank" adjustments and oil and gas overlifts,
underlifts and imbalances for production through and including December 31,
1999, notwithstanding any disclosure of such matters in the Disclosure Schedule;
and

          (f) the withdrawal of the Provisional Consent Order or any
modification to the terms of the Provisional Consent Order made in any final
order of the FTC in respect thereof.

The indemnity and defense obligation set forth in this Section 8.3 shall apply
regardless of cause or of any negligent acts or omissions of any Purchaser
Indemnified Party (including, without limitation, the sole negligence,
concurrent negligence or strict liability of any Purchaser Indemnified Party).

          Section 8.4 INDEMNIFICATION PROCEDURES. With respect to Third
Party Claims other than those relating to Taxes, all claims for indemnification
by any Indemnified Party hereunder shall be asserted and resolved as set forth
in this Section 8.4. In the event that any written claim or demand for which
ARCO or Purchaser, as the case may be (an "INDEMNIFYING PARTY"), may be liable
to any Indemnified Party hereunder is asserted against or sought to be collected
from any Indemnified Party by a third party, such Indemnified Party shall
promptly, but in no event later than 20 days following such Indemnified Party's
receipt of such claim or demand, notify the Indemnifying Party of such claim or
demand and the amount or the estimated amount thereof to the extent then
feasible (which estimate shall not be conclusive of the final amount of such
claim or demand) (the "THIRD PARTY CLAIM NOTICE") and in the event that an
Indemnified Party shall assert a claim for indemnity under this Article VIII or
Section 5.22(d), not including any Third Party Claim, the Indemnified Party
shall notify the Indemnifying Party promptly following its discovery of the
facts or circumstances giving rise thereto (together with a Third Party Claim
Notice, a "CLAIM NOTICE"). The Indemnifying Party shall have no liability with
respect to any expenses incurred by the Indemnified Party prior to the time the
Claim Notice is delivered to the Indemnifying Party. The Indemnifying Party
shall have 30 days from the personal delivery or mailing of the Claim Notice
(the "NOTICE PERIOD") to notify the Indemnified Party whether or not it desires
to defend the Indemnified Party against such claim or demand. All costs and
expenses incurred by an Indemnified Party in defending such claim or demand
after the Claim Notice is delivered to the Indemnifying Party shall be
considered Losses of the Indemnified Party for purposes of Sections 8.2 and 8.3
of this Agreement. Except as hereinafter provided, in the event that the
Indemnifying Party notifies the Indemnified Party within the Notice Period that
it desires to defend the Indemnified Party against such claim or demand, the
Indemnifying Party shall have the right to defend the Indemnified Party by
appropriate proceedings and shall have the sole power to direct and control such
defense. If the Indemnifying Party so elects to assume the defense of such
claim, the Indemnifying Party shall not be liable to the Indemnified Party for
any legal expenses subsequently incurred by the Indemnified Party. If any
Indemnified Party desires to participate in, but not control, any such defense
it may do so

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at its sole cost and expense. An Indemnified Party shall not settle, compromise
or discharge a claim or demand for which it has the right to claim
indemnification from the Indemnifying Party hereunder or admit to any liability
with respect to such claim or demand without the prior written consent of the
Indemnifying Party (which may be withheld in the sole discretion of the
Indemnifying Party). The Indemnifying Party shall not, without the prior written
consent of the Indemnified Party (which may be withheld in the sole discretion
of the Indemnified Party) settle, compromise or discharge or offer to settle,
compromise or discharge any such claim or demand on a basis which (x) does not
include a provision whereby the plaintiff or claimant in the matter releases the
Indemnified Party from all liability with respect to the Third Party Claim or
(y) imposes any obligation on the Indemnified Party or any Subsidiary or
Affiliate thereof other than the payment to be made by the Indemnifying Party.
If the Indemnifying Party elects not to defend the Indemnified Party, then the
Indemnified Party shall have the right to defend the claim or demand by
appropriate proceedings and shall have the sole power to direct and control such
defense. If the Indemnifying Party elects not to defend the Indemnified Party
against such claim or demand, then the amount of any such claim or demand, or,
if the same be contested by the Indemnified Party, then that portion of any such
claim or demand as to which such defense is unsuccessful (and all reasonable
costs of expenses pertaining to such defense) shall be the liability of the
Indemnifying Party hereunder, subject to the limitations set forth in Section
8.6 hereof. In any event, the Indemnifying Party shall (at its own expense) have
the right to participate in the defense or settlement of any Third Party Claim
for which the Indemnifying Party may be liable hereunder. To the extent the
Indemnifying Party shall direct, control or participate in the defense or
settlement of any Third Party Claim, the Indemnified Party will provide the
Indemnifying Party and its counsel access to all relevant business records and
other documents, and shall use its best efforts to assist, and to cause the
employees and counsel of the Indemnified Party to assist, in defense of such
claim.

          Section 8.5 CHARACTERIZATION OF INDEMNIFICATION PAYMENTS. Any amounts
paid by ARCO or Purchaser pursuant to this Article VIII shall be treated for all
Tax purposes as adjustments to the Purchase Price.

          Section 8.6  LIMITATIONS ON LIABILITY.

          (a) Purchaser shall not be liable to any Seller Indemnified Party and
Sellers shall not be liable to any Purchaser Indemnified Party in respect of any
claim for indemnification arising under Section 8.2(a), 8.3(a) or 8.3(c), unless
and until the aggregate amount of Losses arising out of all such claims of
indemnification by the Seller Indemnified Parties or the Purchaser Indemnified
Parties, as applicable, exceeds in the aggregate $85,000,000 (the "DEDUCTIBLE"),
and then, only to the extent of any Losses exceeding such Deductible.

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          (b) Purchaser shall have no liability to any Seller Indemnified Party,
and Sellers shall have no liability to any Purchaser Indemnified Party, in
respect of any individual claim for indemnification (or groups of related claims
or claims of the same Person having substantially similar factual and legal
bases) under Section 8.2(a) or 8.3(a) or the Losses arising from such claim
unless and until the Losses arising therefrom exceed $1,000,000. Any Losses
arising out of any claim or claims of a Purchaser Indemnified Party excluded
from indemnification pursuant to this Section 8.6(b) shall not count against the
Deductible.

          (c) For purposes of this Article VIII and Section 5.22(d), (i) Losses
shall not include any Losses (A) that would result from a change in GAAP or a
change in Law after the Effective Time having retroactive effect, (B) to the
extent there are reserves reflected in the Year-End Financial Statements in
respect of the matter giving rise to such Losses (except that this clause (B)
shall not apply to the indemnification provided in Section 5.22(d)) or (C) to
the extent the Indemnified Party or any of its Affiliates receives or has the
uncontested right to receive insurance proceeds from a third party (not
including any proceeds from an insurance policy that is claims rated or is
otherwise the economic equivalent of self-insurance unless Purchaser shall be
entitled to assert claims against such insurance and shall have indemnified
Sellers with respect thereto in accordance with Section 5.13) in respect of such
Losses and (ii) the amount of any Losses for which indemnification is provided
under this Article VIII or Section 5.22(d) shall be reduced by the present value
of any Tax benefits actually realized by the Indemnified Party arising from the
incurrence or payment of any such Losses and increased by the present value of
any Tax cost actually incurred by the Indemnified Party as a result of any
indemnification payment under this Article VIII or Section 5.22(d).

          (d) Notwithstanding any other provision of this Agreement, neither
party shall be entitled to receive from the other party, and no indemnification
shall be provided under Sections 5.22(d), 8.2 or 8.3 in respect of, any special,
indirect, incidental, punitive or consequential damages (except to the extent
assessed against the Indemnified Party by a Governmental Entity of competent
jurisdiction).

          (e) Unless and until the BP Amoco/ARCO Merger is consummated, Sellers
and BP Amoco shall not have any liability under this Agreement to Purchaser
(whether for indemnification under this Article VIII or otherwise) or any other
liability to Purchaser (other than any remedy that may be expressly provided by
Article IX) arising out of or in connection with any breach by either Seller of
any of its representations, warranties, covenants and agreements in this
Agreement.

          Section 8.7 INDEMNIFICATION AS SOLE REMEDY. After the First Closing
occurs, unless this Agreement expressly provides other remedies, the indemnity
provided herein as it relates to this Agreement and the transactions
contemplated by this Agreement shall be the sole and exclusive remedy of the
Seller Indemnified Parties and the Purchaser

                                       71

<PAGE>

Indemnified Parties (without limitation of any rights of Sellers or Purchaser
under Section 6.4 in respect of the Second Closing, under Article IX or Section
5.5) with respect to any and all claims for Losses sustained, incurred or
suffered, directly or indirectly, relating to or arising out of this Agreement
and the transactions contemplated hereby, including, without limitation, any
such claims arising under or based upon any Laws, and Purchaser on behalf of the
Purchaser Indemnified Parties and ARCO on behalf of the Seller Indemnified
Parties waive, to the fullest extent permitted under applicable Laws, any and
all rights, claims and causes of action, legal or equitable, to pursue any other
remedies.

          Section 8.8 TAX INDEMNIFICATION. Claims for indemnification with
respect to Taxes shall be governed by Section 5.5 rather than by this Article
VIII (except to the extent set forth in Section 8.6(c)(ii)).

          Section 8.9 TITLE MATTERS.

          (a) TITLE DUE DILIGENCE. After execution and delivery of this
Agreement, ARCO Alaska will make available during ARCO Alaska's regular business
hours, for Purchaser's review, records in ARCO Alaska's possession relating to
the title to the individual Fields and Exploration Leases. As soon as reasonably
practicable (and on an ongoing basis), but in no event later than 120 days after
the First Closing, Purchaser may notify Sellers in writing of any (a) title
defect which results in a reduction in Area Participation Percentage as set
forth in Schedule 8.9 of the Disclosure Schedule for the Field in question, and
(b) any failure of title in and to an Exploration Lease. Such notice shall
include a description and reasonably detailed explanation (including any and all
supporting documentation associated therewith) of each title defect or title
failure being claimed. The parties shall meet from time to time as necessary in
an attempt to agree on a resolution with respect to any title defects or title
failures raised by Purchaser.

          (b) AREA PARTICIPATION PERCENTAGE. The parties agree that (i) any and
all monetary adjustments resulting from a title defect associated with the
Fields claimed by Purchaser shall be calculated by multiplying the actual
percentage decrease in the Area Participation Percentage of the Field in
question as set forth in Schedule 8.9 of the Disclosure Schedule by the Value
allocated to the Area Participation Percentage of the Field in question, and
(ii) no monetary adjustment associated with a title defect may exceed the Value
allocated to the Area Participation Percentage of the Field in question. If the
parties are unable to agree on a resolution with respect to one or more of the
title defects claimed by Purchaser, Purchaser may, within 180 days after the
Closing, initiate binding arbitration in accordance with the provisions set
forth in Section 8.9(d) to resolve the dispute over the title defect. If
Purchaser fails to submit such dispute to binding arbitration for resolution
within such 180-day period, Purchaser's right to a monetary adjustment resulting
from such title defect or defects shall terminate, and Purchaser

                                       72

<PAGE>

irrevocably waives any and all claims it may have against Sellers and their
Affiliates associated with the same.

          (c) EXPLORATION LEASES. The parties agree that any and all monetary
adjustments resulting from a title failure associated with the Exploration
Leases claimed by Purchaser shall be calculated by multiplying ARCO Alaska's
purported working interest in the Exploration Lease in question (as reflected in
the land department files of ARCO Alaska) by the amount of the original lease
bonus paid to the applicable lessor; PROVIDED, HOWEVER, that Purchaser shall not
be entitled to a monetary adjustment resulting from a title failure associated
with the Exploration Leases unless and until the aggregate amount of the actual
monetary adjustments determined in accordance with this Section 8.9(c) exceeds
in the aggregate $2,187,500, and then, only to the extent that any monetary
adjustment exceeds such deductible amount. If the parties are unable to agree on
a resolution with respect to one or more of the title failures claimed by
Purchaser, Purchaser may, within 180 days after the First Closing, initiate
binding arbitration in accordance with the provisions set forth in Section
8.9(d) to resolve the dispute over the title failure. If Purchaser fails to
submit the dispute over the title failure to binding arbitration for resolution
within such 180-day period, Purchaser's right to a monetary adjustment resulting
from such title failure or failures shall terminate, and Purchaser irrevocably
waives any and all claims it may have against Sellers and their Affiliates
associated with the same.

          (d) ARBITRATION. Any and all disputes arising under Sections 8.9(b)
and 8.9(c) shall be resolved through the use of binding arbitration using three
arbitrators, in accordance with the Commercial Arbitration Rules of the American
Arbitration Association, as supplemented by the Federal Arbitration Act (Title 9
of the United States Code) to the extent necessary to determine any procedural
appeal questions. If there is any inconsistency between this Section 8.9 and the
Commercial Arbitration Rules or the Federal Arbitration Act, the terms of this
Section 8.9 will control the rights and obligations of the parties. Arbitration
must be initiated within the applicable time limits set forth in Section 8.9(b)
or 8.9(c), as applicable, and not thereafter. Arbitration may be initiated by
Purchaser by serving written notice on Sellers that Purchaser elects to refer
the dispute to binding arbitration. Purchaser's notice initiating binding
arbitration must identify the arbitrator Purchaser has appointed. Sellers shall
respond to Purchaser within 60 days after receipt of Purchaser's notice,
identifying the arbitrator Sellers have appointed. If Sellers fail for any
reason to name an arbitrator within the 60-day period, Purchaser will name the
arbitrator for Sellers' account. The two arbitrators so chosen shall select a
third arbitrator within 30 days after the second arbitrator has been appointed.
Sellers will pay the compensation and expenses of the arbitrator named by or for
it, and Purchaser will pay the compensation and expenses of the arbitrator named
by it. Sellers and Purchaser will each pay one-half of the compensation and
expenses of the third arbitrator. All arbitrators must be neutral parties who
have never been officers, directors or employees of the parties or any of their
Affiliates, and must have not less than seven

                                       73

<PAGE>

years of title examination legal experience in the oil and gas industry. The
hearing will be conducted in Anchorage, Alaska and commence within 60 days after
the selection of the third arbitrator. The parties and the arbitrators should
proceed diligently and in good faith in order that the award may be made as
promptly as possible. The award of damages, if any, by the arbitrators shall be
limited as follows: (i) with respect to title defects asserted in accordance
with the provisions of Section 8.9(b), damages (A) shall be calculated by
multiplying the actual percentage decrease in the Area Participation Percentage
of the Field in question as set forth in Schedule 8.9 of the Disclosure Schedule
by the Value allocated to the Area Participation Percentage of the Field in
question, and (B) shall not exceed the Value allocated to the Area Participation
Percentage of the Field in question, and (ii) with respect to title failures
asserted in accordance with the provisions of Section 8.9(c), damages (A) shall
be calculated by multiplying ARCO Alaska's purported working interest in the
Exploration Lease in question (as reflected in the land department files of ARCO
Alaska) by the amount of the original lease bonus paid to the applicable lessor,
and (B) Purchaser shall not be entitled to a monetary adjustment resulting from
a title failure associated with the Exploration Leases unless and until the
aggregate amount of the actual monetary adjustments determined in accordance
with Section 8.9(c) exceeds in the aggregate $2,187,500, and then, only to the
extent that any monetary adjustment exceeds such deductible amount. The
arbitrators shall additionally have no right to grant or award any special,
indirect, punitive or consequential damages of any kind. Except as provided in
the Federal Arbitration Act, the decision of the arbitrators will be binding on
and non-appealable by the parties.

          (e) SOLE REMEDY. The provisions of this Section 8.9 set forth the sole
and exclusive remedy of Purchaser and its Affiliates with respect to any and all
defects or deficiencies in title to the Properties, other than AMI Conveyed
Properties, and Purchaser, on behalf of itself and the Purchaser Indemnified
Parties, waives, to the fullest extent permitted under applicable Law, any and
all rights, claims and causes of action, legal or equitable, to pursue any other
remedies.

          Section 8.10  INSPECTION OF AMI CONVEYED PROPERTIES OWNED BY AMI.

          (a)  INSPECTION. After execution and delivery of this Agreement and
within 60 days of the date hereof, ARCO will cause AMI to provide Purchaser with
an opportunity to conduct a class inspection of each tanker listed on Schedule
1.1(B) that is owned by AMI and an opportunity to review each tanker's
classification certificate so that the Purchaser may confirm that each such
tanker has been assigned by the classification society, American Bureau of
Shipping, Inc., the class set forth on Schedule 1.1(B) for such tanker and is
suitable for the carriage of crude oil in the trade in which it is currently
engaged on behalf of AMI.

          (b) NOTIFICATION OF ANY DEFICIENCY. As soon as reasonably practicable
(and on an ongoing basis), but in no event later than 10 days after the end of
the 60-day


                                       74

<PAGE>

period referred to in Section 8.10(a), Purchaser may notify ARCO in
writing of any deficiency which results, as of the First Closing Date, in a
failure of any tanker to be in such class or additional conditions or
recommendations being made with respect to such class, in each case not arising
out of the operation of such tanker by Purchaser after the ARCO Marine Transfer
Date. Such notice must include a description and reasonably detailed explanation
(including any and all supporting documentation associated therewith) of each
deficiency being claimed and the value Purchaser in good faith attributes to the
same. The parties shall consult and/or meet from time to time as necessary in an
attempt to agree on a resolution with respect to the deficiency claimed by
Purchaser. Promptly upon (i) any such agreement between the parties on the
resolution of any deficiency claimed by Purchaser or (ii) a final arbitration
award with respect to such deficiency in accordance with Section 8.10(c), ARCO
shall pay to Purchaser the reasonable costs of correcting any such deficiency in
accordance with the applicable resolution.

          (c) ARBITRATION. Any and all disputes arising under this Section 8.10
must be resolved through the use of binding arbitration using three arbitrators,
in accordance with the Rules of the Society of Maritime Arbitrators (New York),
Inc., as supplemented by the Federal Arbitration Act (Title 9 of the United
States Code) to the extent necessary to determine any procedural appeal
questions. If there is any inconsistency between this Section 8.10 and the Rules
of the Society of Maritime Arbitrators (New York), Inc., the terms of this
Section 8.10 will control the rights and obligations of the parties. Arbitration
must be initiated within the applicable time limits set forth in Section 8.10(b)
and not thereafter. Arbitration may be initiated by Purchaser serving written
notice on ARCO that Purchaser elects to refer the dispute to binding
arbitration. Purchaser's notice initiating binding arbitration must identify the
arbitrator Purchaser has appointed from the list of arbitrators maintained by
the Society of Maritime Arbitrators (New York), Inc. ARCO shall respond to
Purchaser within 60 days after receipt of Purchaser's notice, identifying the
arbitrator ARCO has appointed from the list of arbitrators maintained by the
Society of Maritime Arbitrators (New York), Inc. If ARCO fails for any reason to
name an arbitrator within the 60 day period, Purchaser will name the arbitrator
for ARCO's account. The two arbitrators so chosen shall select a third
arbitrator within 30 days after the second arbitrator has been appointed. ARCO
will pay the compensation and expenses of the arbitrator named by or for it, and
Purchaser will pay the compensation and expenses of the arbitrator named by it.
The parties will each pay one-half of the compensation and expenses of the third
arbitrator. The hearing will be conducted in the City of New York and commence
within 60 days after the selection of the third arbitrator. The parties and the
arbitrators should proceed diligently and in good faith in order that the award
may be made as promptly as possible. The award of damages by the arbitrators, if
any, shall be the reasonable cost required to restore the tanker to the
classification set forth on Schedule 1.1(B) for such tanker. The arbitrators
shall additionally have no right to grant or award any special, indirect,
punitive or consequential

                                       75

<PAGE>

damages of any kind. Except as provided in the Federal Arbitration Act, the
decision of the arbitrators will be binding on and non-appealable by the
parties.

                                   ARTICLE IX
                                   TERMINATION

          Section 9.1 TERMINATION OF AGREEMENT. This Agreement may be terminated
at any time prior to the First Closing:


          (a)  by written agreement of Purchaser and Sellers;

          (b) by either Purchaser or Sellers, if there shall be in effect any
Law that prohibits the consummation of the First Closing or if consummation of
the First Closing would violate an Order which has become final and
non-appealable;

          (c)  by either Sellers or Purchaser if the Merger Agreement is
terminated for any reason whatsoever other than by consummation of the BP
Amoco/ARCO Merger;

          (d)  by Purchaser (provided that Purchaser is not in material breach
of any representation, warranty, covenant or agreement contained herein) in the
event that Sellers shall have materially breached this Agreement and such breach
would result in the failure of a condition to the First Closing set forth in
Section 6.1 or 6.2 and such breach is not capable of being cured prior to the
First Closing;

          (e) by Sellers (provided that Sellers are not in material breach of
any representation, warranty, covenant or agreement contained herein) in the
event that Purchaser shall have materially breached this Agreement and such
breach would result in the failure of a condition to the First Closing set forth
in Section 6.1 or 6.3 and such breach is not capable of being cured prior to the
First Closing;

          (f) by Sellers, if (i) the First Closing shall not have occurred as a
result of any action or inaction by Purchaser on or prior to the fifth Business
Day following the first day on which the First Closing could occur in accordance
with Section 2.2(a), (ii) the Provisional Consent Order or the State Consent
Order shall not have been issued within 10 Business Days of the date hereof or
(iii) the State of Alaska notifies ARCO Alaska and BP Exploration that it
objects to the proposed sale of the Shares and the Conveyed Properties to
Purchaser pursuant to Section V.E.2. of the Charter; or

          (g)  by Purchaser, if the First Closing shall not have occurred as a
result of any action or inaction by Sellers on or prior to the fifth Business
Day following the first day on which the First Closing could occur in accordance
with Section 2.2(a).

                                       76

<PAGE>

          Section 9.2 EFFECT OF TERMINATION. In the event of the termination of
this Agreement in accordance with Section 9.1 hereof, this Agreement shall
thereafter become void and have no effect, and no party hereto shall have any
liability to any other party hereto or its Affiliates, directors, officers,
shareholders, partners, attorneys, accountants, agents or employees in
connection with this Agreement; PROVIDED, HOWEVER, that the obligations of the
parties hereto contained in the Confidentiality Agreement and in this Section
9.2 and in Sections 5.22(d), 10.1, 10.2, 10.4, 10.6, 10.7, 10.8 and 10.10 hereof
shall survive, and nothing herein will relieve any party from liability for any
material breach of this Agreement prior to such termination.

          Section 9.3 TERMINATION OF CERTAIN OBLIGATIONS. In the event that the
Second Closing shall not have occurred on or prior to June 30, 2001, the
obligations, covenants and agreements of the parties under (a) Sections 2.4,
2.5, 2.7 and 6.4 and (b) Article V and Article VIII, but only with respect to
the Second Closing and any Shares, Companies and Conveyed Properties that are
the subject of the Second Closing, shall terminate and no party hereto shall
have any liability to any other party hereto or its Affiliates, directors,
officers, shareholders, partners, attorneys, accountants, agents or employees in
connection with the aforementioned obligations, covenants and agreements.

                                    ARTICLE X
                                  MISCELLANEOUS

          Section 10.1 NOTICES. All notices or other communications hereunder
shall be deemed to have been duly given and made if in writing and if served by
personal delivery upon the party for whom it is intended, if delivered by
registered or certified mail, return receipt requested, or by a national courier
service, or if sent by facsimile; PROVIDED that the facsimile is promptly
confirmed by telephone confirmation thereof, to the person at the address set
forth below, or such other address as may be designated in writing hereafter, in
the same manner, by such person:

          To Purchaser:


              Phillips Petroleum Company
              Phillips Building
              Bartlesville, Oklahoma 74004

              Telephone:        (918) 661-5634
              Facsimile:        (918) 662-1617
              Attn:             J. Bryan Whitworth

              With a copy to:

              Wachtell, Lipton, Rosen & Katz

                                       77

<PAGE>

              51 West 52nd Street
              New York, NY 10019

              Telephone:        (212) 403-1000
              Facsimile:        (212) 403-2000
              Attn:             Andrew R. Brownstein, Esq.
                                Elliott V. Stein, Esq.

              To Sellers:

              Atlantic Richfield Company
              333 South Hope Street
              Los Angeles, CA 90071

              Telephone:        (213) 486-1774
              Facsimile:        (213) 486-3354
              Attn:             Bruce G. Whitmore

              And

              CH-Twenty, Inc.
              444 South Flower Street, 32nd Floor
              Los Angeles, CA 90071

              Telephone:        (213) 486-3640
              Facsimile:        (213) 486-2063
              Attn:             Steven R. Porter

          With a copy to:

              BP Amoco p.l.c.
              Britannic House
              1 Finsbury Circus
              London EC2M 7BA
              England

              Telephone:        (011-44-171) 496-4013
              Fax:              (011-44-171) 496-4592
              Attn:             Peter B.P. Bevan

              And

              SULLIVAN & CROMWELL

                                       78

<PAGE>

              125 Broad Street
              New York, New York 10004

              Telephone:        (212) 558-4000
              Facsimile:        (212) 558-3588
              Attn:             Benjamin F. Stapleton, III

              Section 10.2 AMENDMENT; WAIVER. Any provision of this Agreement
may be amended or waived if, and only if, such amendment or waiver is in writing
and signed, in the case of an amendment, by Sellers and Purchaser, or in the
case of a waiver, by the party against whom the waiver is to be effective. No
failure or delay by any party in exercising any right, power or privilege
hereunder shall operate as a waiver thereof nor shall any single or partial
exercise thereof preclude any other or further exercise thereof or the exercise
of any other right, power or privilege.

              Section 10.3 ASSIGNMENT. No party to this Agreement may assign
any of its rights or obligations under this Agreement without the prior written
consent of the other parties hereto; PROVIDED, HOWEVER, that, subject to the
provisions of Section 5.18, Purchaser may assign its rights to purchase the
Shares, any of the Conveyed Properties or any of the Product Inventory to a
wholly owned Subsidiary of Purchaser without, however, in any respect limiting
Purchaser's obligations pursuant to this Agreement. Any assignment in
contravention of this provision shall be null and void.

              Section 10.4 ENTIRE AGREEMENT. This Agreement (including the
Disclosure Schedule) contains the entire agreement between the parties hereto
with respect to the subject matter hereof and supersedes all prior agreements
and understandings, oral or written, with respect to such matters, except for
the Confidentiality Agreement, which will remain in full force and effect until
the Second Closing.

              Section 10.5 FULFILLMENT OF OBLIGATIONS. Any obligation of any
party to any other party under this Agreement, which obligation is performed,
satisfied or fulfilled by an Affiliate of such party, shall be deemed to have
been performed, satisfied or fulfilled by such party.

              Section 10.6 PARTIES IN INTEREST. This Agreement shall inure to
the benefit of and be binding upon the parties hereto and their respective
successors and permitted assigns. Nothing in this Agreement, express or implied,
is intended to confer upon any Person other than Sellers or Purchaser or their
successors or permitted assigns any rights or remedies under or by reason of
this Agreement; PROVIDED, HOWEVER, that Purchaser's obligations under Sections
5.6 and 5.21 are intended for the benefit of the employees of the Companies and
the ARCO Directors and Officers, respectively.

                                       79
<PAGE>

              Section 10.7 PUBLIC DISCLOSURE. Notwithstanding anything herein
to the contrary, each of the parties to this Agreement hereby agrees with the
other parties hereto that no press release or similar public announcement or
communication shall, prior to the First Closing, be made or caused to be made
concerning the execution or performance of this Agreement without prior
consultation with the other parties hereto.

              Section 10.8 EXPENSES. Except as otherwise expressly provided in
this Agreement, whether or not the transactions contemplated by this Agreement
are consummated, all costs and expenses incurred in connection with this
Agreement and the transactions contemplated hereby shall be borne by the party
incurring such expenses.

              Section 10.9 SCHEDULES. The disclosure of any matter in any
schedule to this Agreement shall be deemed to be a disclosure for all purposes
of this Agreement to which such matter could reasonably be likely to be
pertinent, but shall expressly not be deemed to constitute an admission by
Seller, or to otherwise imply, that any such matter is material for the purposes
of this Agreement.

              Section 10.10 GOVERNING LAW; SUBMISSION TO JURISDICTION;
SELECTION OF FORUM. THIS AGREEMENT SHALL BE GOVERNED BY THE LAWS OF THE STATE OF
NEW YORK APPLICABLE TO CONTRACTS TO BE WHOLLY PERFORMED IN SUCH STATE. EACH
PARTY HERETO AGREES THAT IT SHALL BRING ANY ACTION OR PROCEEDING IN RESPECT OF
ANY CLAIM ARISING OUT OF OR RELATED TO THIS AGREEMENT OR THE TRANSACTIONS
CONTAINED IN OR CONTEMPLATED BY THIS AGREEMENT, WHETHER IN TORT OR CONTRACT OR
AT LAW OR IN EQUITY, EXCLUSIVELY IN THE UNITED STATES DISTRICT COURT FOR THE
SOUTHERN DISTRICT OF NEW YORK OR THE SUPREME COURT OF THE STATE OF NEW YORK FOR
THE COUNTY OF NEW YORK (THE "CHOSEN COURTS") AND (I) IRREVOCABLY SUBMITS TO THE
EXCLUSIVE JURISDICTION OF THE CHOSEN COURTS, (II) WAIVES ANY OBJECTION TO LAYING
VENUE IN ANY SUCH ACTION OR PROCEEDING IN THE CHOSEN COURTS, (III) WAIVES ANY
OBJECTION THAT THE CHOSEN COURTS ARE AN INCONVENIENT FORUM OR DO NOT HAVE
JURISDICTION OVER ANY PARTY HERETO AND (IV) AGREES THAT SERVICE OF PROCESS UPON
SUCH PARTY IN ANY SUCH ACTION OR PROCEEDING SHALL BE EFFECTIVE IF NOTICE IS
GIVEN IN ACCORDANCE WITH SECTION 10.1 OF THIS AGREEMENT OR IN ANY OTHER MANNER
PERMITTED BY LAW.

              Section 10.11 COUNTERPARTS. This Agreement may be executed in
counterparts, each of which shall be deemed an original, and all of which shall
constitute one and the same Agreement.

                                       80
<PAGE>

              Section 10.12 HEADINGS. The heading references herein and the
table of contents hereto are for convenience purposes only, do not constitute a
part of this Agreement and shall not be deemed to limit or affect any of the
provisions hereof.

              Section 10.13 SEVERABILITY. The provisions of this Agreement
shall be deemed severable and the invalidity or unenforceability of any
provision shall not affect the validity or enforceability of the other
provisions hereof. If any provision of this Agreement, or the application
thereof to any person or entity or any circumstance, is invalid or
unenforceable, (a) a suitable and equitable provision shall be substituted
therefor in order to carry out, so far as may be valid and enforceable, the
intent and purpose of such invalid or unenforceable provision, and (b) the
remainder of this Agreement and the application of such provision to other
persons, entities or circumstances shall not be affected by such invalidity or
unenforceability, nor shall such invalidity or unenforceability affect the
validity or enforceability of such provision, or the application thereof, in any
other jurisdiction.

              Section 10.14 EXTENSION OF PERFORMANCE. Whenever under the terms
of this Agreement the time for performance of a covenant or condition falls upon
a day that is not a Business Day, such time for performance shall be extended to
the next Business Day.



                                       81
<PAGE>

          IN WITNESS WHEREOF, the parties have executed or caused this Agreement
to be executed as of the date first written above.

                             ATLANTIC RICHFIELD COMPANY

                             By:  /S/ MIKE R. BOWLIN
                                -----------------------
                                Name: Mike R. Bowlin
                                 Title: Chairman and
                                        Chief  Executive Officer


                             CH-TWENTY, INC.

                             By: /S/ TERRY G. DALLAS
                                -----------------------
                                Name:  Terry G. Dallas
                                 Title:  Vice-President


                             PHILLIPS PETROLEUM COMPANY

                             By: /S/ J.J. MULVA
                                -----------------------
                                Name: J.J. Mulva
                                 Title: Chairman and
                                        Chief Executive Officer

              SOLELY FOR PURPOSES OF SECTION 5.12 HEREOF:

                                BP AMOCO P.L.C.


                                By: /S/ G.R. BRADLEY
                                -----------------------
                                Name: G.R. Bradley
                                 Title:  Attorney-in Fact






<TABLE> <S> <C>


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<MULTIPLIER>                  1,000,000

<S>                                               <C>
<PERIOD-TYPE>                                     3-MOS
<FISCAL-YEAR-END>                           DEC-31-2000
<PERIOD-END>                                MAR-31-2000
<CASH>                                            1,007
<SECURITIES>                                        253
<RECEIVABLES>                                     1,406
<ALLOWANCES>                                          0
<INVENTORY>                                         385
<CURRENT-ASSETS>                                  3,250
<PP&E>                                           38,983
<DEPRECIATION>                                  (20,810)
<TOTAL-ASSETS>                                   26,531
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<BONDS>                                           5,599
                                 0
                                           1
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<TOTAL-LIABILITY-AND-EQUITY>                     26,531
<SALES>                                           3,993
<TOTAL-REVENUES>                                  4,194
<CGS>                                             2,946
<TOTAL-COSTS>                                     3,046
<OTHER-EXPENSES>                                      0
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<INTEREST-EXPENSE>                                  110
<INCOME-PRETAX>                                     902
<INCOME-TAX>                                        271
<INCOME-CONTINUING>                                 617
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<EPS-BASIC>                                        1.91
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