ATLANTIC RICHFIELD CO /DE
10-Q, 1999-11-12
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

                               ________________

<TABLE>

<S>                                                         <C>
For the quarterly period ended September 30, 1999           Commission file number 1-1196
</TABLE>
                                ________________


                          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, $2.50 par value, outstanding as of
September 30, 1999:  322,731,860.
<PAGE>

                         PART I.  FINANCIAL INFORMATION

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

                        CONSOLIDATED STATEMENT OF INCOME
<TABLE>
<CAPTION>

                                                        Three Months Ended    Nine Months Ended
                                                           September 30,        September 30,
                                                        -------------------   ------------------
                                                         1999       1998       1999       1998
                                                        -------   ---------   -------   --------
<S>                                                     <C>       <C>         <C>       <C>
(Millions except per share amounts)
Revenues
  Sales and other operating revenues...................  $3,423     $2,655     $8,885    $7,755
  Other revenues.......................................     119        146        428       346
                                                        -------     ------     ------    ------
                                                          3,542      2,801      9,313     8,101
                                                        -------     ------     ------    ------
Expenses
  Trade purchases......................................   1,418      1,039      3,397     3,096
  Operating expenses...................................     593        919      1,753     2,013
  Selling, general and administrative expenses.........     168        187        496       572
  Depreciation, depletion and amortization.............     423        399      1,334     1,077
  Impairment of oil and gas properties.................       -        147          -       257
  Exploration expenses (including undeveloped
    leasehold amortization)............................     100        135        282       410
  Taxes other than income taxes........................     117        121        353       397
  Interest.............................................      98        123        288       326
  Loss on disposition of Algeria assets................     175          -        175         -
  Restructuring cost adjustments.......................      20          -         20         -
                                                        -------     ------     ------    ------
                                                          3,112      3,070      8,098     8,148
                                                        -------     ------     ------    ------

Income (loss) from continuing operations before
  income taxes and minority interest...................     430       (269)     1,215       (47)
Provision (benefit) for taxes on income................      87       (138)       382      (128)
Minority interest in earnings of subsidiaries..........      13          7         25        21
                                                        -------     ------     ------    ------

Income (loss) from continuing operations...............     330       (138)       808        60
Income from discontinued operations, net of
  income taxes of $7 and $93 (1998)....................       -         12          -       188
Gain on disposition of discontinued operations,
  net of income taxes (benefit) of $(38) (1999, both
  periods) and $1,612 (1998, both periods).............      42        998         42       998
                                                        -------     ------     ------    ------
Net income............................................. $   372     $  872     $  850    $1,246
                                                        =======     ======     ======    ======
Earned per Share
  Basic
    Continuing operations.............................. $  1.03     $(0.43)    $ 2.51    $ 0.18
    Discontinued operations............................     .13       3.14        .13      3.70
                                                        -------     ------    -------   -------
    Net income......................................... $  1.16     $ 2.71    $  2.64   $  3.88
                                                        =======     ======    =======   =======
  Diluted
    Continuing operations.............................. $  1.00     $(0.43)   $  2.46   $   .18
    Discontinued operations............................     .13       3.14        .13      3.63
                                                        -------     ------    -------   -------
    Net income......................................... $  1.13     $ 2.71    $  2.59   $  3.81
                                                        =======     ======    =======   =======

Cash Dividends Paid per Share of Common Stock.......... $ .7125     $.7125    $2.1375   $2.1375
                                                        =======     ======    =======   =======
</TABLE>
        The accompanying notes are an integral part of these statements.

                                       1
<PAGE>

                           ATLANTIC RICHFIELD COMPANY
                           CONSOLIDATED BALANCE SHEET
<TABLE>
<CAPTION>


                                                      September 30,   December 31,
                                                          1999            1998
                                                      -------------   ------------
<S>                                                   <C>             <C>
(Millions)

Assets
Current assets:
  Cash and cash equivalents........................         $   745        $   657
  Short-term investments...........................             246            260
  Accounts receivable..............................           1,504          1,002
  Inventories......................................             427            475
  Prepaid expenses and other current assets........             224            317
                                                            -------        -------

  Total current assets.............................           3,146          2,711
                                                            -------        -------

Investments and long-term receivables:
  Investments accounted for on the equity method...           1,291          1,235
  Other investments and long-term receivables......           1,322            831
                                                            -------        -------

                                                              2,613          2,066
                                                            -------        -------

Net property, plant and equipment..................          18,563         18,762

Net assets of discontinued operations..............              67            339
Deferred charges and other assets..................           1,438          1,321
                                                            -------        -------
Total assets.......................................         $25,827        $25,199
                                                            =======        =======
</TABLE>

       The accompanying notes are an integral part of these statements.

                                       2
<PAGE>

                           ATLANTIC RICHFIELD COMPANY
                           CONSOLIDATED BALANCE SHEET
<TABLE>
<CAPTION>


                                                     September 30,    December 31,
                                                          1999            1998
                                                     --------------   -------------
<S>                                                  <C>              <C>
(Millions)

Liabilities and Stockholders' Equity
Current liabilities:
  Notes payable...................................         $ 1,958         $ 2,403
  Accounts payable................................             717             976
  Long-term debt due within one year..............             105             399
  Taxes payable...................................             509             634
  Other...........................................           1,007           1,285
                                                            ------          ------

  Total current liabilities.......................           4,296           5,697

Long-term debt....................................           5,691           4,332
Deferred income taxes.............................           3,468           3,318
Dismantlement, restoration and reclamation........           1,138           1,058
Other deferred liabilities and credits............           2,845           2,955
Minority interest.................................             285             259
                                                            ------          ------

  Total liabilities...............................          17,723          17,619
                                                            ------         -------

Stockholders' equity:
  Preference stocks...............................               1               1
  Common stock....................................             816             815
  Capital in excess of par value of stock.........             859             863
  Retained earnings...............................           6,749           6,589
  Treasury stock..................................            (285)           (344)
  Accumulated other comprehensive income (loss)...             (36)           (344)
                                                            ------          ------

  Total stockholders' equity......................           8,104           7,580
                                                            ------          ------
Total liabilities and stockholders' equity........         $25,827         $25,199
                                                            ======          ======
</TABLE>

       The accompanying notes are an integral part of these statements.

                                       3
<PAGE>

                           ATLANTIC RICHFIELD COMPANY
                      CONSOLIDATED STATEMENT OF CASH FLOWS
<TABLE>
<CAPTION>

                                                                             Nine Months Ended
                                                                               September 30,
                                                                               -------------
                                                                              1999       1998
                                                                              ----       ----
<S>                                                                         <C>       <C>
(Millions)
Cash flows from operating activities:
Income from continuing operations.................................          $  808    $    60
Adjustments to reconcile income to net cash
 provided by operating activities:
  Depreciation, depletion and amortization........................           1,334      1,077
  Impairment of oil and gas properties............................               -        257
  Dry hole expense and undeveloped leasehold amortization.........             150        194
  Loss on disposition of Algeria assets...........................             175          -
  Net gain on asset sales.........................................             (70)       (56)
  Income from equity investments..................................             (31)       (53)
  Dividends from equity investments...............................              50          9
  Minority interest in earnings of subsidiaries...................              25         21
  Cash payments (greater) less than noncash provisions............            (347)        85
  Changes in working capital accounts.............................            (811)      (217)
  Deferred income taxes...........................................             184       (103)
  Other...........................................................              48        108
                                                                             -----     ------

    Net cash provided by operating activities.....................           1,515      1,382
                                                                             -----     ------

Cash flows from investing activities:
  Union Texas Petroleum acquisition...............................               -     (2,707)
  Additions to fixed assets (including dry hole costs)............          (1,988)    (2,477)
  Net cash used by short-term investments.........................              (1)        (7)
  Proceeds from sale of ARCO Chemical stock.......................               -      4,593
  Proceeds from asset sales.......................................             732      1,169
  Investments and long-term receivables...........................            (168)      (149)
  Other...........................................................              38       (166)
                                                                             -----     ------

    Net cash (used) provided by investing activities..............          (1,387)       256
                                                                            ------     ------

Cash flows from financing activities:
  Repayments of long-term debt....................................            (826)      (235)
  Proceeds from issuance of long-term debt........................           1,891        215
  Net cash used by notes payable..................................            (439)      (347)
  Dividends paid..................................................            (690)      (688)
  Treasury stock purchases........................................              (2)       (31)
  Other...........................................................              37         48
                                                                             -----     ------

    Net cash used by financing activities.........................             (29)    (1,038)
                                                                             -----      -----

Cash flows from discontinued operations...........................              (8)        37

Effect of exchange rate changes on cash...........................              (3)        (1)
                                                                             -----     ------

Net increase in cash and cash equivalents.........................              88        636

Cash and cash equivalents at beginning of period..................             657        434
                                                                             -----     ------

Cash and cash equivalents at end of period........................          $  745    $ 1,070
                                                                             =====     ======
</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 foregoing financial information is unaudited and has been prepared from
the books and records of the Company.  Certain previously reported amounts have
been restated to conform to classifications adopted in 1999.  In the opinion of
the Company, the financial information reflects all adjustments, consisting of
normal recurring adjustments, necessary for a fair presentation of the financial
position and results of operations in conformity with generally accepted
accounting principles.


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- and nine-
month periods ended September 30, 1999 and 1998 was as follows:

<TABLE>
<CAPTION>

                                                      Three Months Ended    Nine Months Ended
                                                        September 30,         September 30,
                                                     --------------------   ------------------
                                                       1999        1998      1999       1998
                                                     ---------   --------   -------   --------
<S>                                                  <C>         <C>        <C>       <C>
(Millions)
Net income........................................      $ 372      $ 872     $  850    $1,246
Other comprehensive income:
  Net unrealized gain (loss) on investments (a)          (114)      (198)       101      (717)
  Foreign currency translation adjustment.........         23         38        207       (12)
  Minimum pension liability.......................          -          7          -         7
                                                        -----      -----     ------    ------

Comprehensive income..............................      $ 281      $ 719     $1,158    $  524
                                                        =====      =====     ======    ======
</TABLE>

(a) Primarily consists of tax-effected changes in the fair value of ARCO's
    investment in LUKOIL, which had a fair value of approximately $382 million
    at September 30, 1999, compared to a fair value of approximately $225
    million at December 31, 1998.  The unrealized pretax gain on the LUKOIL
    investment at September 30, 1999, was $40 million.

    Accumulated nonowner changes in equity (accumulated other comprehensive
income) at September 30, 1999 and December 31, 1998 were as follows:
<TABLE>
<CAPTION>

                                                            September 30,  December 31,
                                                               1999            1998
                                                           -------------   -------------
<S>                                                        <C>             <C>
      (Millions)
      Net unrealized gain (loss) on investments.........          $  26           $ (75)
      Foreign currency translation adjustment...........            (15)           (222)
      Minimum pension liability.........................            (47)            (47)
                                                                  -----           -----

        Accumulated other comprehensive income (loss)...          $ (36)          $(344)
                                                                  =====           =====
</TABLE>

                                       5
<PAGE>

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED


NOTE C.  Interim Segment Information.


Three Months Ended September 30, 1999
- -------------------------------------

<TABLE>
<CAPTION>

                          Exploration     Refining &    Other      Unallocated
(Millions)                & Production    Marketing   Operations      Items      Total
                          ------------    ---------   ----------   -----------   -----
<S>                     <C>               <C>         <C>          <C>           <C>
Sales and other
 operating revenues . .     $ 1,882        $1,959       $    8       $    2    $ 3,851
Intersegment revenues. .       (424)            -           (1)          (3)      (428)
                             ------         -----        -----        -----    -------
Total. . . . . . . . . .    $ 1,458        $1,959       $    7       $   (1)   $ 3,423
                             ======         =====        =====        ======    ======

Income (loss) from
 continuing operations      $   183        $  182       $   25       $  (60)   $   330
Income from discontinued
 operations*  . . . . .           -             -            -           42         42
                            -------        ------       ------       ------      -----

Net income (loss). . . .    $   183        $  182       $   25       $  (18)   $   372
                             ======         =====        =====        ======    ======

Segment assets . . . . .    $18,428        $4,270       $  929       $2,200    $25,827
                             ======         =====        =====        ======    ======


December 31, 1998
- -----------------

Segment assets . . . . .    $18,203        $3,826       $1,119       $2,051    $25,199
                             ======         =====        =====        ======    ======
<CAPTION>


Three Months Ended September 30, 1998
- -------------------------------------


                          Exploration     Refining &    Other      Unallocated
(Millions)                & Production    Marketing   Operations      Items      Total
                          ------------    ---------   ----------   -----------   -----
<S>                     <C>               <C>         <C>          <C>           <C>
Sales and other
 operating revenues . .     $ 1,518        $1,386       $   39       $    3    $ 2,946
Intersegment revenues. .       (268)            -          (20)          (3)      (291)
                             ------         -----        -----       ------     ------
Total. . . . . . . . . .    $ 1,250        $1,386       $   19       $    -    $ 2,655
                             ======         =====        =====       ======     ======

Income (loss) from
 continuing operations      $   (56)       $  108       $   45       $ (235)   $  (138)
Income from discontinued
 operations*  . . . . .          -              -            -        1,010      1,010
                             ------         -----        -----       ------     ------
Net income (loss). . . .    $   (56)       $  108       $   45       $  775    $   872
                             ======         =====        =====        ======    ======
</TABLE>
_______________

* Includes gains on disposition of discontinued operations of $42 million and
  $998 million for the periods, ended September 30, 1999 and 1998, respectively.

                                       6
<PAGE>

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED


NOTE C.  Interim Segment Information (Continued).

<TABLE>
<CAPTION>

Nine Months Ended September 30, 1999
- ------------------------------------

                          Exploration     Refining &    Other      Unallocated
(Millions)                & Production    Marketing   Operations      Items       Total
                          ------------    ---------   ----------   -----------    -----
<S>                       <C>             <C>         <C>          <C>           <C>
Sales and other
 operating revenues . .     $ 4,735        $ 5,084      $   37       $    7      $ 9,863
Intersegment revenues. .       (968)             -          (3)          (7)        (978)
                             ------         ------       -----        -----       ------
Total. . . . . . . . . .    $ 3,767        $ 5,084      $   34       $    -      $ 8,885
                             ======         ======       =====        =====       ======

Income from continuing
 operations . . . . . .     $   446        $   517      $   73       $ (228)     $   808
Income from discontinued
 operations*  . . . . .           -              -           -           42           42
                             ------         ------       -----        -----       ------
Net income (loss). . . .    $   446        $   517      $   73       $ (186)     $   850
                             ======         ======       =====        =====       ======



Nine Months Ended September 30, 1998
- ------------------------------------


                          Exploration     Refining &    Other      Unallocated
(Millions)                & Production    Marketing   Operations      Items       Total
                          ------------    ---------   ----------   -----------    -----
<S>                       <C>             <C>         <C>          <C>           <C>
Sales and other
 operating revenues . .     $ 4,424        $ 4,170      $  118       $   19      $ 8,731
Intersegment revenues. .       (892)           (12)        (60)         (12)        (976)
                             ------         ------       -----        -----       ------
Total. . . . . . . . . .    $ 3,532        $ 4,158      $   58       $    7      $ 7,755
                             ======         ======       =====        =====       ======

Income from continuing
 operations . . . . . .     $   143        $   224      $   98       $ (405)     $    60
Income from discontinued
 operations*  . . . . .          -              -            -        1,186        1,186
                             ------         ------       -----        -----       ------
Net income . . . . . . .    $   143        $   224      $   98       $  781      $ 1,246
                             ======         ======       =====        =====       ======
</TABLE>
_______________

* Includes gains on disposition of discontinued operations of $42 million and
  $998 million for the periods, ended September 30, 1999 and 1998, respectively.


    The Company's coal and chemical operations have been reported as
discontinued operations since March 31, 1998 and June 30, 1998, respectively.
Accordingly, at December 31, 1998 and September 30, 1999, the income from and
net assets of discontinued operations are included with unallocated items in the
segment presentation above.

    The amortization (and recognition of imputed interest) associated with a
gain deferred in conjunction with the sale of the chemicals operations had a
favorable impact of approximately $11 million and $38 million after tax on
Refining and Marketing earnings in the third quarter and first nine months of
1999, respectively.  The amortization, which began in the third quarter of 1998,
had a favorable impact of approximately $9 million after tax in the third
quarter of 1998.

                                       7
<PAGE>

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED


NOTE D.  Investments.

    At September 30, 1999 and 1998, investments in debt securities were
primarily composed of U.S. Treasury securities and corporate debt instruments.
Maturities generally ranged from one day to ten years. 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 September 30,
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 (loss).

    The following summarizes investments in securities at September 30:

<TABLE>
<CAPTION>

                                                                                              1999       1998
                                                                                            --------   --------
<S>                                                                                         <C>        <C>
          (Millions)

          Aggregate fair value...........................................................   $ 1,142    $   951
          Gross unrealized holding losses................................................         6        200
          Gross unrealized holding gains.................................................       (45)       (19)
                                                                                            -------    -------

          Amortized cost.................................................................   $ 1,103    $ 1,132
                                                                                            =======    =======
</TABLE>

    Investment activity for the nine-month periods ended September 30 was as
follows:

<TABLE>
<CAPTION>

                                                                                              1999       1998
                                                                                            -------    -------
<S>                                                                                         <C>        <C>
          (Millions)

          Gross purchases................................................................   $16,330    $14,493
          Gross sales....................................................................       708        339
          Gross maturities...............................................................    15,567     13,935
</TABLE>

Gross realized gains and losses were determined by the specific identification
method and for the three- and nine-month periods ended September 30, 1999 and
1998, were insignificant.


NOTE E.  Inventories.

    Inventories at September 30, 1999 and December 31, 1998 comprised the
following:

<TABLE>
<CAPTION>

                                         September 30,  December 31,
                                             1999           1998
                                         ------------   ------------
<S>                                      <C>            <C>
   (Millions)

   Crude oil and petroleum products...          $ 187          $ 220
   Other products.....................             26             24
   Materials and supplies.............            214            231
                                                -----          -----

     Total............................          $ 427          $ 475
                                                =====          =====
</TABLE>

                                       8
<PAGE>

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED

NOTE F.  Capital Stock.

    Detail of the Company's capital stock was as follows:

<TABLE>
<CAPTION>

                                                              September 30,  December 31,
                                                                  1999           1998
                                                              ------------   ------------
<S>                                                           <C>            <C>
   (Thousands)

   $3.00 Cumulative convertible preference stock, par $1...       $     43       $     52
   $2.80 Cumulative convertible preference stock, par $1...            509            573
   Common stock, par $2.50.................................        815,881        814,673
                                                                  --------       --------
    Total.................................................        $816,433       $815,298
                                                                  ========       ========
</TABLE>


NOTE G.  Capitalization of Interest.

    Interest expense excluded capitalized interest of $45 million and $29
million, respectively, for the three-month periods ended September 30, 1999 and
1998, and $133 million and $66 million, respectively, for the nine-month periods
ended September 30, 1999 and 1998.


NOTE H.  Restructuring Programs.

    During 1998, ARCO recorded pretax charges of $229 million for the costs of
eliminating over 1,200 positions, primarily exploration and production technical
support, international exploration and production support operations and the
corporate headquarters.  During the third quarter of 1999 ARCO increased the
provision by $12 million primarily to reflect approximately 75 additional
terminations.  The following table summarizes the liabilities related to the
1998 restructuring program, including $10.5 million transferred from the 1997
program to cover those people who had not yet terminated under the 1997 program
and became eligible for the 1998 program:

<TABLE>
<CAPTION>


($ Millions)
                                       Funded        Unfunded
                      Short-term     Long-term      Long-term
   Terminations      Benefits (a)   Benefits (b)   Benefits (c)   Total
   ------------      ------------   ------------   ------------   -----
<S>                  <C>            <C>            <C>            <C>
      1,285                 $103            $90            $58     $251
</TABLE>

      (a) Severance payments and ancillary benefits such as relocation and
          outplacement.
      (b) Net increase in pension benefits to be paid from assets of qualified
          plans.
      (c) Net increase in non-qualified pension benefits and other
          postretirement benefits to be paid from Company funds.

    Through September 30, 1999, approximately 1,045 employees have been
terminated and approximately $64 million ($14 million in the third quarter of
1999) 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.  The remaining severance and ancillary benefits are expected to be
paid by first quarter 2001.

                                       9
<PAGE>

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED


NOTE H.  Restructuring Programs (continued).

Union Texas Petroleum Holdings, Inc. (UTP) Restructure.

    As part of the purchase price allocation for the purchase of UTP in 1998,
the company established a $78 million reserve for the termination of 357
employees resulting from the integration of UTP into ARCO's operations.  In
September 1999, the reserve was increased to $86 million.  At September 30,
1999, 352 employees have been terminated and a total of $80 million in severance
benefits has been paid. The remaining severance benefits are expected to be paid
by second quarter 2000.  The group of employees terminated included U.S.
citizens employed in exploration and production operations and corporate
headquarters personnel.


NOTE I.  Income Taxes.

    Provision (benefit) for taxes on income:

<TABLE>
<CAPTION>

                  Three Months Ended     Nine Months Ended
                    September 30,          September 30,
                 --------------------   -------------------
                   1999        1998       1999       1998
                 ---------   --------   --------   --------
<S>              <C>         <C>        <C>        <C>
(Millions)

Federal:
  Current.....      $(128)     $ (41)     $  37      $ (86)
  Deferred....        197        (66)       228        (17)
                    -----      -----      -----      -----

                       69       (107)       265       (103)
                    -----      -----      -----      -----

Foreign:
  Current.....         32         19        144         44
  Deferred....         (5)       (40)       (55)       (76)
                    -----      -----      -----      -----

                       27        (21)        89        (32)
                    -----      -----      -----      -----

State:
  Current.....        (18)         6         17         17
  Deferred....          9        (16)        11        (10)
                    -----      -----      -----      -----

                       (9)       (10)        28          7
                    -----      -----      -----      -----

    Total.....      $  87      $(138)     $ 382      $(128)
                    =====      =====      =====      =====

</TABLE>

                                       10
<PAGE>

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED


Note I.  Income Taxes (continued).

    Reconciliation of provision for taxes on income with tax at federal
statutory rate:

<TABLE>
<CAPTION>
                                                                 Three Months Ended
                                                                    September 30,
                                                                   --------------
                                                                1999                        1998
                                                                ----                        ----
                                                              Percent                     Percent
                                                                 of                          of
                                                               Pretax                      Pretax
                                                    Amount     Income        Amount        Income
                                                   --------   --------       ------       --------

<S>                                                <C>        <C>        <C>              <C>
(Millions)

Income (loss) from continuing operations
 before income taxes and minority interest......    $  430      100.0            $(269)     100.0
                                                    ======      =====            =====     ======

Tax at federal statutory rate...................    $  150       35.0            $ (94)     (35.0)
Increase (reduction) in taxes resulting from:
 Subsidiary stock transactions..................       (22)      (5.1)              (7)      (2.6)
 Taxes on foreign income in excess of
  statutory rate................................         3        0.7                4        1.5
 State income taxes (net of federal effect).....        (6)      (1.4)              (6)      (2.2)
 Tax credits....................................       (42)      (9.8)             (28)     (10.4)
 Other..........................................         4        0.8               (7)      (2.6)
                                                    ------      -----            -----     ------

Provision (benefit) for taxes on income.........    $   87       20.2            $(138)     (51.3)
                                                    ======      =====            =====     ======

<CAPTION>
                                                                      Nine Months Ended
                                                                        September 30,
                                                                        -------------
                                                               1999                        1998
                                                               ----                        ----
                                                              Percent                     Percent
                                                                of                          of
                                                              Pretax                      Pretax
                                                   Amount     Income        Amount        Income
                                                   ------     -------       ------        -------

(Millions)

Income (loss) from continuing operations
 before income taxes and minority interest .....    $1,215      100.0            $ (47)     100.0
                                                    ======      =====            =====     ======

Tax at federal statutory rate...................    $  425       35.0            $ (16)     (35.0)
Increase (reduction) in taxes resulting from:
 Subsidiary stock transactions..................       (22)      (1.8)             (64)    (136.2)
 Taxes on foreign income in excess of
  statutory rate................................        46        3.8               44       93.6
 State income taxes (net of federal effect).....        18        1.5                5       10.6
 Tax credits....................................       (92)      (7.6)             (87)    (185.1)
 Other..........................................         7        0.5              (10)     (20.2)
                                                    ------      -----            -----     ------

Provision (benefit) for taxes on income.........    $  382       31.4            $(128)    (272.3)
                                                    ======      =====            =====     ======
</TABLE>

                                       11
<PAGE>

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED


NOTE J.  Discontinued Operations.

    In the first quarter 1999, ARCO disposed of its interests in two Australian
coal mines.  ARCO disposed of its 80% interest in the Gordonstone coal mine and
its 31.4% interest in the Blair Athol Joint Venture.  At September 30, 1999, the
carrying value of the remaining Australian assets was $67 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).  In 1998, ARCO recorded a $92
million provision for the estimated loss on the disposal of the U.S. and
Australian coal assets.

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

    In the third quarter of 1999, the gain or loss recorded on the disposition
of ARCO Chemical, the ARCO coal operations and UTP's petrochemical business was
adjusted to reflect an additional net gain of $42 million.

    Revenues and income from discontinued operations for the three months and
nine months ended September 30, 1999 and 1998 were:

<TABLE>
<CAPTION>


                          Three Months Ended   Nine Months Ended
                            September 30,        September 30,
                          ------------------   -----------------
                           1999       1998      1999      1998
                          -------   --------   ------   --------
<S>                       <C>       <C>        <C>      <C>
Revenues:

   ARCO Chemical.......   $     -      $ 290    $   -     $1,990
   Coal operations.....        20         61       63        293
   UTP petrochemical...         -         23       24         23
                          -------      -----    -----     ------
                          $    20      $ 374    $  87     $2,306
                          =======      =====    =====     ======
Net income:

   ARCO Chemical.......   $     -      $  12    $   -     $  178
   Coal operations.....         -          -        -         10
   UTP petrochemical...         -          -        -          -
                          -------      -----    -----     ------
                          $     -      $  12    $   -     $  188
                          =======      =====    =====     ======
</TABLE>
_______________

                                       12
<PAGE>

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED


NOTE K.  Earned Per Share.

    The information necessary for the calculation of earned per share is as
follows:

<TABLE>
<CAPTION>

                                                                      Three Months Ended             Three Months Ended
                                                                      September 30, 1999             September 30, 1998
                                                                      --------------------------   -----------------------
                                                                      Income Shares Per share      Income Shares Per share
                                                                      --------------------------   ----------------------
(Millions, except per share amounts)
<S>                                                                   <C>     <C>     <C>            <C>       <C>      <C>
Income (loss) from continuing
  operations..........................                                $330                           $ (138)
Less: Preference stock dividends* .                                      -                                -
                                                                      ----                            -----
Income (loss) from continuing
  operations available to common
  stockholders - basic EPS............                                 330    322.5   $1.03            (138)   321.2   $(0.43)
                                                                              =====                            =====

Income from discontinued operations                                     42    322.5     .13            1,010   321.2     3.14
                                                                      ----    =====   -----          -------   =====   ------
Net income available to common
  stockholders - basic EPS............                                 372    322.5   $1.16          $   872   321.2   $ 2.71
                                                                                      =====          =======   =====   ======

Effect of dilutive securities**:
Contingently issuable shares
  (primarily options).................                                          3.8
Convertible preference stock..........                                   -      3.2
                                                                      ----    -----
Net income available to common
  stockholders and assumed
  conversions - diluted EPS...........                                 372    329.5   $1.13
                                                                              =====

Less: income from discontinued
  operations..........................                                  42    329.5     .13
                                                                      ----    =====   -----

Income from continuing operations
  available to common stockholders
  and assumed conversions -
  diluted EPS.........................                                $330    329.5   $1.00
                                                                      ====    =====   =====
- ---------------
</TABLE>
*  Dividend rounds to zero for the three-month periods presented.
** No dilution assumed for three months ended September 30, 1998
   due to loss from continuing operations.

                                       13
<PAGE>

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED


NOTE K.  Earned Per Share (continued).

<TABLE>
<CAPTION>

                                            Nine Months Ended               Nine Months Ended
                                            September 30, 1999             September 30, 1998
                                            ------------------             ------------------
                                          Income Shares Per share        Income Shares Per share
                                          ------ ------ ---------        ------ ------ ---------

(Millions, except per share amounts)

<S>                                       <C>      <C>     <C>           <C>      <C>      <C>
Income from continuing operations......  $  808                          $   60
Less: Preference stock dividends.......      (1)                             (2)
                                            ---                           -----
Income from continuing operations
  available to common stockholders -
  basic EPS............................     807    322.1   $2.51             58   320.9    $0.18
                                                   =====                          =====

Income from discontinued operations          42    322.1     .13          1,186   320.9     3.70
                                                   =====    ----         ------   =====    -----

Net income available to common
  stockholders - basic EPS.............     849    322.1   $2.64          1,244   320.9    $3.88
                                                            ====                            ====

Effect of dilutive securities:
Contingently issuable shares
  (primarily options)..................              3.1                            2.8
Convertible preference stock...........       1      3.3                      2     3.6
                                            ---    -----                  -----   -----

Net income available to common
  stockholders and assumed
  conversions - diluted EPS............     850    328.5   $2.59          1,246   327.3    $3.81
                                                   =====                          =====
Less: Income from discontinued
  operations...........................      42    328.5     .13          1,186   327.3     3.63
                                            ---    =====     ---          -----   =====     ----

Income from continuing operations
 available to common stockholders
 and assumed conversions -
 diluted EPS...........................  $  808    328.5   $2.46         $   60   327.3    $0.18
                                          =====    =====    ====          =====   =====     ====
</TABLE>


                                       14
<PAGE>

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED


NOTE L.  Supplemental Income Statement Information.

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

                             Three Months Ended    Nine Months Ended
                               September 30,         September 30,
                               -------------         -------------
                               1999      1998      1999       1998
                               ----      ----      ----       ----
<S>                          <C>        <C>        <C>      <C>
   (Millions)

   Production/severance...      $  64     $  54    $ 156     $ 173
   Property...............         32        39      101       109
   Other..................         21        28       96       115
                                -----     -----    -----     -----

     Total................      $ 117     $ 121    $ 353     $ 397
                                =====     =====    =====     =====

</TABLE>

NOTE M.  Supplemental Cash Flow Information.

     Following is supplemental cash flow information for the nine months ended
September 30, 1999 and 1998:

<TABLE>
<CAPTION>
                                                             Nine Months Ended
                                                               September 30,
                                                               -------------
                                                              1999        1998
                                                              ----        ----
(Millions)
<S>                                                          <C>        <C>

   Gross sales and maturities of short-term investments...   $   153    $    171
   Gross purchases of short-term investments..............      (154)       (178)
                                                              ------     -------

   Net cash used by short-term investments................   $    (1)   $     (7)
                                                              ======     =======


   Gross proceeds from issuance of notes payable..........   $ 9,526    $ 12,096
   Gross repayments of notes payable......................    (9,965)    (12,443)
                                                              ------     -------

   Net cash used by notes payable.........................   $  (439)   $   (347)
                                                              ======     =======


   Gross noncash provisions charged to income.............   $   168    $    416
   Cash payments of previously accrued items..............      (515)       (331)
                                                              ------     -------

   Cash payments (greater) less than noncash provisions...   $  (347)   $     85
                                                              ======     =======

   Interest paid..........................................   $   258    $    318(a)
                                                              ======     =======

   Income taxes paid......................................   $   472    $    169(a)
                                                              ======      ======
</TABLE>
  (a) Includes amounts paid related to discontinued operations.

                                       15
<PAGE>

s
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED


NOTE M.  Supplemental Cash Flow Information (continued).

    Excluded from the Consolidated Statement of Cash Flows for the nine months
ended September 30, 1998 was the issuance of 2,725,030 shares of ARCO common
stock to a consolidated subsidiary in exchange for certain property, plant and
equipment owned by the subsidiary.  The transaction was recorded at fair market
value.

    In conjunction with the acquisition of UTP in 1998, liabilities were assumed
as follows:

            (Millions)

            Fair value of assets acquired . . . . . . $3,745
            Cash paid . . . . . . . . . . . . . . . .  2,707
                                                       -----

               Liabilities assumed. . . . . . . . . . $1,038
                                                       =====

    Changes in working capital accounts for the nine-month periods ended
September 30, 1999 and 1998 were as follows:

                                                            Nine Months Ended
                                                              September 30,
                                                            ---------------
                                                            1999        1998
                                                            ----        ----

(Millions)

Changes in working capital - Increase (decrease) to cash:

   Accounts receivable..................................    $(232)      $  71
   Inventories..........................................       38         (18)
   Accounts payable.....................................     (259)         22
   Other working capital................................     (358)       (292)
                                                            ------      ------

     Total..............................................    $(811)      $(217)
                                                            ======      ======

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

                                       16
<PAGE>

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED


NOTE N.  Other Commitments and Contingencies (continued).

    Lawsuits, including purported class actions and actions by governmental
entities, are pending or threatened against ARCO and others seeking damages,
abatement of 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 1999 the United States District Court
for the District of Montana approved two consent decrees.  Under the terms of
these decrees, ARCO has paid $135 million, plus interest, for settlement of $561
million of the State's $767 million natural resource damage claim relating to
the Clark Fork River Basin, $86 million for clean-up and related liabilities at
Silver Bow Creek, and $20 million to resolve claims by the Tribes and the United
States.

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

 .  Remove or mitigate the effects on the environment at various sites from the
   disposal or release of certain substances;
 .  Perform restoration work at such sites; and
 .  Pay damages for loss of use and non-use values.

    The federal agencies involved with the sites include 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 comprised 125 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 environmental assessments
and cleanups.  Future costs depend on unknown factors such as:

 .  Nature and extent of contamination;
 .  Timing, extent and method of the remedial action;
 .  ARCO's proportional share of costs; and
 .  Financial condition of other responsible parties.

  The environmental remediation accrual is updated annually, at a minimum, and
at September 30, 1999, was $702 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 $500 million.

                                       17
<PAGE>

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - UNAUDITED


NOTE N.  Other Commitments and Contingencies (continued).

    Approximately 54% 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.  The
remainder related to other sites with reserves ranging from $1 million to $10
million per site.  No one site represents more than 10% of the total reserve.
Substantially all amounts accrued are expected to be paid out over the next five
to 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.

    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 period, 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. Merger Agreement between ARCO and BP Amoco.

    On March 31, 1999, BP Amoco and ARCO reached agreement to combine with each
other in an all-share transaction. Following the stock split of BP Amoco
Ordinary Shares effective in October 1999, shareholders of ARCO will receive
1.64 BP Amoco American Depositary Shares for each share of ARCO stock exchanged
or, subject to election by the shareholder, Ordinary Shares. One BP Amoco
American Depositary Share represents 6 BP Amoco Ordinary Shares.

    The merger was approved initially by both boards of directors, and in the
third quarter of 1999 by the shareholders of both BP Amoco and ARCO. In
addition, on September 29, 1999, the European Commission announced approval of
the combination conditioned upon some North Sea asset sales. The combination is
subject to the review of various state and regulatory authorities, including the
Federal Trade Commission. Both companies are currently working to close the
transaction later in the year; however, there can be no assurance that the
transaction will be completed by year end.

                                       18
<PAGE>

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


Third Quarter 1999 vs. Third Quarter 1998


Income from Continuing Operations

    ARCO's income from continuing operations improved to $330 million in the
third quarter of 1999, compared to a loss of $138 million in the third quarter
of 1998.  The improvement primarily was the result of higher crude oil and
natural gas prices, higher refined products margins and lower operating,
exploration and interest expenses.


Special Items included in Net Income

    The 1999 third quarter net income included net after-tax charges of $139
million for special items, consisting of a loss on the disposition of Algeria
assets, an increase in the restructuring cost reserves, charges for future
environmental remediation and merger costs, partially offset by tax adjustments.

    The 1998 third quarter net income included a net after-tax benefit of $799
million from special items, consisting of a gain of $1,088 million from the sale
of ARCO's interest in ARCO Chemical Company ("ARCO Chemical"), partially offset
by various charges. The charges were for future environmental remediation and
reclamation related to both current operations and to natural resource damage
liabilities in the state of Montana associated with previously discontinued
mining operations; a provision for estimated net loss on divestment of coal
operations; and an impairment writedown of California heavy crude oil
properties.

<TABLE>
<CAPTION>

After-tax Segment Earnings
<S>                               <C>      <C>       <C>          <C>          <C>         <C>
                                            1999                                1998
                                            ----                                ----
                                            Less:                               Less:
                                           Special                             Special
                                             Items                               Items
           (Millions)             Net      (Charge)  Operating     Net         (Charge)    Operating
                                  Income    Benefit   Results     Income       Benefit      Results
                                  -----    --------   -------     ------       --------     -------
 Exploration and production....... $183     $(177)     $360       $ (56)         $ (94)       $ 38
 Refining and marketing...........  182        (2)      184         108              -         108
 Other operations.................   25         5        20          45             17          28
 Interest expense.................  (70)        -       (70)        (92)             -         (92)
 Other unallocated expenses.......   10        (7)       17        (143)          (122)        (21)
                                   ----     -----      ----       -----          -----        ----
 Income (loss) from
   continuing operations..........  330      (181)      511        (138)          (199)         61
 Income from discontinued
   operations.....................    -         -        -           12              -          12
 Gain on disposition of
   discontinued operations........   42        42        -          998            998           -
                                   ----     -----     ----        -----          -----        ----

   Net income..................... $372     $(139)     $511       $ 872           $799        $ 73
                                   ====     =====      ====       =====           ====        ====
</TABLE>

                                      19
<PAGE>

Exploration and Production

    ARCO's operating results from worldwide oil and gas exploration and
production operations in 1999 were impacted by significantly higher crude oil
prices and, to a lesser extent, higher domestic natural gas prices and lower
petroleum liquids production.  In addition, combined operating, exploration, and
selling, general and administrative ("SG&A") expenses before tax were more than
$100 million lower in the 1999 third quarter, compared to third quarter 1998.

    The 1999 third quarter included a special item charge of $175 million after
tax for the loss on the sale of a portion of ARCO's interest in the Rhourde El
Baguel field in Algeria.  The 1998 third quarter included special items totaling
$94 million after tax, primarily related to the writedown of the California
heavy oil holdings.

<TABLE>
<CAPTION>


Average Oil and Gas Prices
                                                             1999     1998
                                                            ------   ------
<S>                                                         <C>      <C>
      U.S.
        Petroleum liquids - per barrel (bbl)
          Alaska.........................................   $13.32   $ 7.84
          Lower 48, including Vastar.....................   $16.85   $10.47
          Composite average price........................   $14.49   $ 8.76
        Natural gas - per thousand cubic feet (mcf)......   $ 2.25   $ 1.75

      International
        Petroleum liquids - per bbl......................   $16.68   $10.96
        Venezuela crude oil - per bbl....................   $ 8.47   $ 7.94
        Natural gas (excluding LNG) - per mcf............   $ 2.09   $ 2.29
        Indonesia liquefied natural gas (LNG)- per mcf...   $ 3.53   $ 2.29

</TABLE>

Petroleum Liquids and Natural Gas Production

<TABLE>
<CAPTION>

Net Production*                                                     1999        1998
                                                                    ----        ----
<S>                                                                <C>         <C>
      U.S.
      Petroleum liquids - bbl/day
          Alaska............................................       291,200     334,600
          Vastar............................................        62,500      44,800
          Other Lower 48....................................        82,700     136,400
                                                                   -------   ---------
            Total...........................................       436,400     515,800
        Natural gas - mcf/day...............................     1,222,000   1,163,500

        Barrels of oil equivalent - (BOE)/day...............       640,100     709,700

      International
        Petroleum liquids - bbl/day.........................       163,600     178,400
        Natural gas - mcf/day...............................       997,600     883,500
        BOE/day.............................................       329,800     325,700

        Total net production - BOE/day......................       969,900   1,035,400
</TABLE>
     *  Includes ARCO's share of production from equity affiliates. For BOE
        calculation, natural gas is converted at the ratio of 6 mcf to 1
        barrel of liquid.

                                       20
<PAGE>

    In 1999, the reduction in U.S. petroleum liquids production primarily
resulted from natural field declines in Alaska and the absence of production
from California properties (other Lower 48), producing exclusively heavy crude
oil. The California properties were exchanged for Gulf of Mexico exploration
acreage and properties producing both crude oil and natural gas that were
ultimately transferred to Vastar. The lower Alaska petroleum liquids production
primarily reflected natural field decline at the Prudhoe Bay, Kuparuk River and
Greater Point McIntyre fields partially offset by increases in satellite field
production. The decline in international petroleum liquids production primarily
reflected a decrease of approximately 16,000 barrels per day in Indonesia
production resulting from the impact of higher crude oil prices on production
sharing contracts.

    Most of the growth in international natural gas production came from the
United Kingdom North Sea, while the increase in U.S. natural gas production
reflected Vastar's 7% growth in production, compared to the third quarter 1998.
Vastar's increased production resulted from the Gulf of Mexico properties
transferred to Vastar late in 1998, successful exploitation programs and the
addition of last year's African Swallow discovery.


Refining and Marketing

    The higher earnings in 1999 primarily resulted from improved light product
margins.  The effect of the West Coast refinery outages in the second quarter of
1999 continued to impact supply in the first two months of the third quarter
1999 resulting in higher product realizations.  The higher product sales prices
were partially offset by higher crude oil costs.  The 3% increase in gasoline
sales volumes reflected increased volumes at existing ARCO retail outlets.  The
increase in jet fuel sales in 1999 reflected the timing on jet fuel military
contract takes in 1999 versus 1998.  In 1998, the military took more of the
fixed contract amount earlier in the year.


West Coast Petroleum Products Sales

<TABLE>
<CAPTION>

Volumes (Barrels/day)                                   1999      1998
                                                       -------   -------
<S>                                                    <C>       <C>

          Gasoline..................................   314,600   304,900
          Jet.......................................   104,700    97,100
          Distillate................................    77,000    83,500
          Other.....................................    74,200    75,400
                                                       -------   -------

          Total.....................................   570,500   560,900
                                                       =======   =======

</TABLE>

Other Operations

    Other operations comprise earnings from Lower 48 pipeline and aluminum
operations.  The 1999 and 1998 earnings included special items of $5 million and
$17 million, respectively, primarily from the sale of pipeline assets.
Excluding the special items, the decline in operating results in 1999 reflected
decreased earnings from the pipeline operations, primarily as a result of the
transfer of certain pipeline operations to the refining and marketing segment.

Discontinued Operations

    In the first quarter of 1999, ARCO sold its interests in two Australian coal
mines, Gordonstone and the Blair Athol Joint Venture, and sold Union Texas
Petrochemicals Corporation, which ARCO had acquired as part of its purchase of
Union Texas Petroleum Holdings, Inc. in June 1998.

                                       21
<PAGE>

    After-tax earnings from discontinued operations in the 1998 third quarter
totaled $12 million.  Discontinued operations in the third quarter 1998 included
ARCO's interest in ARCO Chemical for part of the quarter and Australian coal
operations.


Gain on Disposition of ARCO Chemical Stock

    In the third quarter of 1998, ARCO sold its entire interest in ARCO Chemical
(80,000,001 shares of common stock) to Lyondell, an unrelated third party, for
$4.6 billion and recorded a net after-tax gain of $1,088 million.

    Previously, the Company entered into a ten-year purchase agreement with ARCO
Chemical providing for the delivery of fixed quantities of methyl tertiary butyl
ether ("MTBE") at a fixed price approximating the then-market price.  Over the
last several years the spot market price of MTBE has declined; however,
provision for loss on the contract was not necessary since ARCO Chemical was a
consolidated, majority-owned subsidiary of the Company.

    The above-market MTBE contract value was reflected in the sale price of the
Company's interest in ARCO Chemical.  As a result, ARCO has deferred $313
million of the pre-tax gain on sale of the ARCO Chemical interest.  This
deferral represents the estimated discounted present value of the difference
over the remaining term of the contract between the contract price and the spot
market price for MTBE.

    The deferral will be amortized over the remaining term of the contract on a
unit-of-production basis.  The amortization and recognition of imputed interest
associated with the deferral of part of the pre-tax gain on the sale of the ARCO
Chemical interest is expected to have a net favorable impact of approximately
$40 million after tax on earnings of the refining and marketing segment for the
full year 1999.

<TABLE>
<CAPTION>


Consolidated Revenues
                                                   1999      1998
                                                 ------    ------
<S>                                              <C>       <C>
         (Millions)

         Sales and other operating revenues
           Exploration and production.........   $1,882    $1,518
           Refining and marketing.............    1,959     1,386
           Other..............................       10        42
           Intersegment eliminations..........     (428)     (291)
                                                 ------    ------

             Total............................   $3,423    $2,655
                                                 ======    ======
</TABLE>

    The increase in exploration and production sales revenues resulted primarily
from higher petroleum liquids and natural gas prices, partially offset by lower
crude oil marketing volumes.

    Refining and marketing sales revenues primarily increased because of higher
light product prices.

                                       22
<PAGE>

Consolidated Expenses

    Trade purchases were higher in 1999 primarily as a result of an increase in
purchases of finished refined product from third parties and higher crude oil
costs, partially offset by lower crude oil marketing volumes.

    Operating expenses were lower in 1999 primarily as a result of the absence
of $213 million before tax in special item charges for future environmental
remediation and reclamation related to both current operations and to natural
resource damage liabilities in the state of Montana associated with previously
discontinued mining operations.  In addition, exploration and production
operating costs were more than $50 million before tax lower than in the third
quarter of 1998.

    Selling, general and administrative expenses in 1999 primarily reflected
lower expenses associated with international exploration and production
operations.

    The lower exploration expenses in 1999 primarily resulted from reduced
geological and geophysical ("G&G") expenses including staff-related G&G for
international exploration and production.

   The lower interest expense in 1999 primarily resulted from the impact of
capitalized interest.


Income Taxes

    The Company had an effective tax rate of 20.2% in the 1999 third quarter.
An effective tax rate in 1999 lower than the statutory rate primarily reflected
various tax credits and other benefits.  The Company had a tax benefit in the
1998 third quarter reflecting the Company's loss from continuing operations in
that period.

Nine-Month Period Ended September 30, 1999 vs. Same Nine-Month Period 1998

Income from Continuing Operations

    The improvement in income from continuing operations for the first nine
months of 1999, compared to the same period in 1998, primarily reflected higher
crude oil prices and natural gas volumes, increased refined products margins and
lower operating and SG&A expenses.

Special Items included in Net Income

    Special items for the first nine months of 1999 primarily included the net
after-tax charges of $139 million reported in the third quarter 1999 results.

    Special items for the first nine months of 1998 included the net after-tax
benefit of $799 million included in the third quarter 1998 results, as well as
net charges of $58 million for special items in the first two quarters of 1998.

                                       23
<PAGE>

After-tax Segment Earnings

<TABLE>
<CAPTION>
                                       1999                            1998
                                       ----                            -----
                                       Less:                           Less:
                                      Special                         Special
                                       Items                           Items
 (Millions)                     Net   (Charge)  Operating      Net   (Charge)    Operating
                              Income   Benefit   Results     Income   Benefit    Results
                              ------   -------   -------     ------   -------    -------
<S>                           <C>     <C>       <C>         <C>      <C>         <C>
 Exploration and production   $  446   $ (172)    $618       $  143   $ (169)    $  312
 Refining and marketing . .      517       (4)     521          224        -        224
 Other operations . . . . .       73        5       68           98       17         81
 Interest expense . . . . .     (211)       -     (211)        (236)       -       (236)
 Other unallocated expenses      (17)      (6)     (11)        (169)    (117)       (52)
                              ------   ------    -----       ------   ------     ------
   Income from continuing
     operations . . . . . .      808     (177)     985           60     (269)       329
 Income from discontinued
   operations . . . . . . .        -        -        -          188       12        176
 Gain on disposition of
   discontinued operations        42       42        -          998      998          -
                              ------   ------    -----       ------   ------     ------
 Net income . . . . . . . .   $  850   $ (135)    $985       $1,246   $  741     $  505
                              ======   ======    =====       ======   ======     ======
</TABLE>


<TABLE>
<CAPTION>


Consolidated Revenues
                                                                 1999            1998
                                                                 ----            ----
<S>                                                            <C>             <C>

          (Millions)

          Sales and other operating revenues
            Exploration and production...................       $4,735          $4,424
            Refining and marketing.......................        5,084           4,170
            Other........................................           44             137
            Intersegment eliminations....................         (978)           (976)
                                                                ------          ------

              Total......................................       $8,885          $7,755
                                                                ======          ======
</TABLE>

    The increase in exploration and production sales revenues for the first nine
months of 1999 primarily resulted from higher petroleum liquids prices and
natural gas production volumes.

    For the first nine months of 1999 refining and marketing sales revenues
primarily increased because of higher refined products prices, and to a much
lesser extent increased sales volumes.

                                       24
<PAGE>

Consolidated Expenses

    Trade purchases for the nine months ended September 30, 1999 were higher
primarily as a result of increased purchases of finished and unfinished refined
product from third parties.

    Operating expenses declined during the first nine months of 1999, compared
to the same period in 1998 primarily as a result of the absence of $213 million
before tax in special item charges for future environmental remediation and
reclamation related to both current operations and to natural resource damage
liabilities in the state of Montana associated with previously discontinued
mining operations.  In addition, exploration and production operating costs
decreased approximately $40 million before tax, compared to the nine months
ended September 30, 1998.

    Depreciation, depletion and amortization expense for the first nine months
of 1999 was higher as a result of DD&A of the former UTP operations, which
became a part of ARCO's operations in the third quarter of 1998, and increased
crude oil and natural gas production and higher average depletive writeoff rates
associated with Vastar's operations.

    The lower exploration expense for the first nine months of 1999 reflected a
decline in geological and geophysical and dryhole expense in ARCO's
international exploration operations and Vastar's exploration operations.

    For the nine months ended September 30, 1999, the lower interest expense
resulted from the impact of capitalized interest, partially offset by an
increase in long-term debt outstanding during the first nine months of 1999,
compared to the same period in 1998.


Income Taxes

   The Company had an effective tax rate of 31.4% for the first nine months of
1999.  An effective tax rate in 1999 lower than the statutory rate primarily
reflected various tax credits and other benefits, partially offset by taxes on
foreign income in excess of statutory rate.  The Company had a tax benefit in
the 1998 comparable period reflecting the Company's loss from continuing
operations in that period.

<TABLE>
<CAPTION>


Average Oil and Gas Prices
                                                    Nine Months Ended
                                                      September 30,
                                                    -----------------
                                                     1999        1998
                                                    -------   -------
      <S>                                           <C>       <C>
                U.S.
                  Petroleum liquids - per bbl
                    Alaska.......................    $ 9.76    $ 8.59
                    Lower 48, including Vastar...    $13.40    $11.31
                    Composite average price......    $10.91    $ 9.55
                  Natural gas - per mcf..........    $ 1.89    $ 1.85

</TABLE>

                                       25
<PAGE>

Average Oil and Gas Prices

<TABLE>
<CAPTION>
                                                                                        Nine Months Ended
                                                                                          September 30,
                                                                                          -------------
                                                                                           1999      1998
                                                                                           ----      ----
<S>                                                                                     <C>       <C>
          International
            Petroleum liquids - per bbl..............................................    $12.87    $11.62
            Venezuela crude oil - per bbl............................................    $ 6.41    $ 7.96
            Natural gas (excluding LNG) - per mcf....................................    $ 2.22    $ 2.51
            Indonesia liquid natural gas (LNG) - per mcf.............................    $ 2.94    $ 2.29


</TABLE>
Petroleum Liquids and Natural Gas Production

<TABLE>
<CAPTION>
                                                                                         1999      1998
                                                                                        -------   -------
<S>                                                                                     <C>       <C>
          Net Production*
          U.S.
            Petroleum liquids - bbl/day
              Alaska.................................................................   317,500    346,100
              Vastar.................................................................    59,400     48,600
              Other Lower 48.........................................................    86,800    138,500
                                                                                        -------    -------
                Total................................................................   463,700    533,200
            Natural gas - mcf/day.................................................... 1,280,000  1,125,000

            Barrels of oil equivalent - (BOE)/day....................................   677,000    720,700

          International
            Petroleum liquids - bbl/day..............................................   163,800    116,000
            Natural gas - mcf/day.................................................... 1,091,500    793,100
            BOE/day..................................................................   345,800    248,200

            Total net production - BOE/day........................................... 1,022,800    968,900
</TABLE>

         *  Includes ARCO's share of production from equity affiliates. For BOE
            calculation, natural gas is converted at the ratio of 6 mcf to 1
            barrel of liquid.


Liquidity and Capital Resources

<TABLE>
<CAPTION>
                                                                                          1999
                                                                                          ----
        (Millions)
<S>                                                                                      <C>
        Cash flow provided (used) by:
        Operations...................................................................    $ 1,515
        Investing activities.........................................................    $(1,387)
        Financing activities.........................................................    $   (29)
</TABLE>

    The net cash provided by investing activities in the first nine months of
1999 included expenditures for additions to fixed assets of $2.0 billion, offset
by proceeds from assets sales of $732 million primarily associated with the sale
of Australian coal assets and the Union Texas Petrochemicals Corporation.

    The net cash used by financing activities in the first nine months of 1999
primarily included $826 million in long-term debt repayments, a decrease of $439
million in the Company's short-term debt position and dividend payments of $690
million, offset by proceeds from the issuance of $1.9 billion in long-term debt.

                                       26
<PAGE>

    Cash and cash equivalents and short-term investments totaled $991 million
and short-term borrowings were $1,958 million at the end of the third quarter of
1999.

    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).  While overall short-term borrowings are lower at the end
of the third quarter of 1999 compared to the end of the first quarter 1999, the
Company is still in a working capital deficit position of approximately $1,150
million at September 30, 1999.

         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 and the sale of assets.


Impact of Year 2000 Issue
- -------------------------

    The Company's plans to address the Year 2000 issue are fully described in
its Annual Report on Form 10-K for the year ended December 31, 1998. The
following table is an update of a table contained in that document and shows the
Company's progress on addressing the Year 2000 issue as of October 31,
1999:
<TABLE>
<CAPTION>
                                                                       Total
                                                                     expended
                               Percent                                through          Total
                              complete at       Expected date        October 31,     estimated
                              October 31,             of                1999            cost
    Areas addressed              1999            completion          (millions)      (millions)
    ---------------              ----            -------------       ----------      ----------
<S>                       <C>                  <C>                 <C>              <C>
Computing integrity             100%             October 1999            $14             $14

Asset integrity                  98%             November 1999            11              13

Commercial integrity             96%             November 1999             3               3
                                                                         ---             ---

     Total costs                                                         $28             $30
                                                                         ===             ===
</TABLE>
________________

    Current emphasis is contingency planning for all mission critical com-
ponents and end of year transition. Items outside of ARCO's direct control are
being addressed through the creation of specific contingency plans.

    The total cost associated with required modifications to achieve Year 2000
compliance is not expected to be material to the Company's financial position.
The approximate total cost of the Year 2000 project is $30 million. This
estimate does not include ARCO's potential share of Year 2000 costs that may be
incurred by partnerships and joint ventures in which the Company participates
but is not the operator.

   The ARCO Year 2000 due diligence requires that vendors of mission critical
components and providers of mission critical services be solicited concerning
Year 2000 compliance.  Many of these third party providers have responded in
writing addressing their understanding of the problem and their commitment to
remediating the Year 2000 problem.

                                       27
<PAGE>

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.

                                       28
<PAGE>

                          PART II.  OTHER INFORMATION


Item 1.  Legal Proceedings.

    1. On July 28, 1999, ARCO and the Riverside County District Attorney agreed
       in principle to settle the County Department of Environmental Health's
       (DEH) claim of violation of underground storage tank laws at thirty-three
       ARCO-owned stations in the county. DEH claims ARCO failed to maintain a
       continuous monitoring system, primarily due to the alleged improper
       placement of monitoring probes. Without admitting liability, ARCO agreed
       to pay $200,000 in civil penalties.

    2. On August 13, 1999, the San Joaquin County District Attorney filed an
       action against ARCO, alleging operation without a certificate of
       equipment compliance from the County, among other matters, at eight
       service stations in the San Joaquin area. The District Attorney is
       seeking penalties in excess of $100,000.

    3. On September 20, 1999, ARCO (as successor to IS&R) and The Anaconda
       Company were named by 11 homeowners as defendants in a purported class
       action suit filed in the Circuit Court for Baltimore City, Maryland, Earl
       Cofield, et al. v. Lead Industries Association, et al. (Case No. 24-C-99-
       004491). The amended complaint, which also names 13 alleged former
       manufacturers of lead products, the Lead Industries Association, and the
       National Paint and Coatings Association, alleges causes of action for
       negligent product design and failure to warn, supplier negligence, fraud
       and deceit, conspiracy, concert of action, aiding and abetting, and
       products liability. This matter also incorporates causes of action for
       nuisance, indemnification, and enterprise liability. The plaintiffs seek,
       on behalf of themselves and a purported class of over 10,000 people
       living in the State of Maryland whose pre-1978 residences allegedly were
       contaminated with lead-based paint, compensatory and punitive damages and
       injunctive relief, including orders requiring defendants to pay for (i)
       notification to class members about the hazards of lead pigments, (ii)
       abatement of residences where class members reside, (iii) a public
       education campaign concerning the hazards of lead pigments, lead paint,
       and lead poisoning, and (iv) attorney fees.

4.     On October 12, 1999, ARCO (as successor to IS&R) was named as a defendant
       in a lead paint lawsuit filed in Rhode Island Superior Court, Providence
       County by Rhode Island Attorney General Sheldon Whitehouse, State of
       Rhode Island v. Lead Industries Association, et al. (Case No. 99-5226).
       The complaint, which also names seven former lead pigment manufacturers
       and the Lead Industries Association, alleges causes of action for public
       nuisance, violation of Rhode Island's Unfair Trade Practice and Consumer
       Protection Act, strict liability, negligence, negligent and fraudulent
       misrepresentations, civil conspiracy, unjust enrichment, indemnity and
       equitable relief to protect children. The State of Rhode Island seeks
       compensatory and punitive damages, funding for a public education
       campaign concerning the dangers of lead poisoning and injunctive relief
       that includes an order requiring defendants to pay for the detection and
       abatement of lead paint in all public and private buildings within the
       State that are accessible to children.

                                       29
<PAGE>

Item 1.  Legal Proceedings (continued).

5.   In September, 1999, ARCO and the South Coast Air Quality Management
     District recently reached a tentative settlement of certain notices of
     violation (the "NOVs") alleging that ARCO and two of its contractors --
     Metalclad and Brown & Root -- violated a number of federal and local
     asbestos regulations during excavation activities conducted in 1997 at the
     Los Angeles Refinery in preparation for the installation of certain
     polypropylene manufacturing equipment. The excavation occurred at large
     parcel of land that ARCO had earlier purchased from the Johns Manville
     Corporation and that was the former location of an asbestos manufacturing
     facility. The settlement amount consists of a penalty of $600,000 and
     a future payment of $200,000 towards a supplemental environmental project
     to be agreed upon later by the District and ARCO.

6.   Reference is made to the disclosure on page 19 of the Company's 1998 Form
     10-K Report and on page 27 of the Second Quarter Form 10-Q report regarding
     Squyres v. Barry, et al., (Case No. 16357NC), McMullen v. Union Texas
     Petroleum, et al., (Case No. 16358NC), and Squyres v. Whitmire, et al.
     (Case No. 98-6085). These cases have been dismissed with prejudice.

7.   Reference is made to the Company's 1998 Form 10-K Report for information on
     other legal proceedings matters reported herein.

                                       30
<PAGE>

Item 5.  Other Information.

Safe Harbor for Forward-Looking Statements*

ARCO's management from time to time may make forward-looking statements to
inform existing and potential security holders regarding various matters. Such
statements are generally accompanied by words such as estimate, project, predict
or expect, that convey the uncertainty of future events or outcomes. These
statements may include projections and estimates concerning the timing and
success of specific projects, the size and timing of cost reductions, the level
of future income, production volumes, size of hydrocarbon resources, ability to
replace reserves and levels of capital spending. Actual results could differ
materially based on numerous factors, including those described below. Unless
otherwise noted in the statements, ARCO does not intend to update such forward-
looking statements.


Price Volatility, Political, Economic and Regulatory Instability

Volatility in prices and margins affects all of the company's businesses.
Volatility is caused by a number of factors, including changes in market supply
and demand balances and fluctuations in political, regulatory and economic
climates throughout the world. The ability to operate ARCO's businesses is
dependent on the politics and regulations in the U.S. and in the particular
geographic regions where the company operates. The ability to negotiate and
implement specific projects in a timely and favorable manner may be impacted by
political considerations unrelated to or beyond the control of the company.

Level of Oil and Gas Prices

ARCO's management makes assumptions about the future prices of oil and gas for
various planning, budgetary and accounting disclosure purposes. Management
expects that these assumptions will change over time and actual prices in the
future may differ from these estimates. Any substantial or extended decline in
actual prices could have a material adverse effect on ARCO's financial position
and results of operations, on the quantities of crude oil and natural gas
reserves that economically may be produced and on the quantity of proved
reserves that may be attributed to our properties.

Production Rates and Reserve Replacement

Projecting future rates of oil and gas production is inherently imprecise.
Production rates of oil and gas reservoirs generally decline. Future production
rates can be affected by price volatility and the company's ability to replace
depleting reserves. There can be no assurances: (a) as to the level or timing of
success, if any that the company will have in acquiring or finding and
developing economically recoverable reserves; (b) that estimates of proved
reserves will not be revised in the future; or (c) that the actual quantities of
oil and gas ultimately recovered will not differ from the reserve estimates.



*The company desires to take advantage of the "safe harbor" provisions contained
in Section 27A of the Securities Act and Section 21B of the Exchange Act and is
including this statement in order to do so.

                                       31
<PAGE>

Item 5.  Other Information (continued).

Refining & Marketing

Overall profitability of the company's refining and marketing operations depends
heavily on the margin between the price of crude oil and/or purchased products
and the sales price of products produced and/or purchased. Volumes produced and
margins historically have been volatile and are impacted by market demand,
regulatory changes (particularly environmental regulations regarding gasoline),
the price of crude oil, and the ability of regional refiners and the company to
provide a sufficient supply of refined products.

Operating Hazards

Operations are subject to various hazards common to the industry, including
explosions, fires, uncontrollable spills, and damage from severe weather
conditions.

Year 2000 Risks

The company has described its plans for addressing the Year 2000 issue and made
a number of forward-looking statements regarding its Year 2000 readiness under
the caption "Impact of the Year 2000 Issue." These statements are made on a
number of assumptions: (a) that the company will be able to timely identify and
locate all relevant Year 2000 items; (b) that the company's repair and
replacement program will be timely completed, including work to be performed by
third-party vendors and contractors; and (c) that representations by third
parties regarding their readiness are correct. Actual results could differ
materially if any of these assumptions are incorrect.

Due to the general uncertainty as to the Year 2000 readiness of third parties
and as to the reaction of the general population to any perceived gasoline
shortages, as well as the general interconnectedness of businesses and their
dependency on computers and embedded computer chips, the company cannot assure
its stockholders that its operations and business will not be affected by a Year
2000 issue.

Pending Merger with BP Amoco

The timing of the closing of the combination with BP Amoco is subject to the
timing of governmental reviews.
                                       32
<PAGE>

Item 6.  Exhibits and Reports on Form 8-K

     (a)  Exhibits.
               2      Agreement and Plan of Merger. Among BP Amoco
                      p.l.c., Atlantic Richfield Company and Prarie
                      Holdings, Inc. dated as of March 31, 1999, as
                      amended as of July 12, 1999, filed herewith.


               2.1    Amendment No. 1 to Agreement and Plan of Merger,
                      filed herewith.

              10.1    Amended and Restated Atlantic Richfield Capital
                      Accumulation Plan, effective March 15, 1999,
                      filed herewith.


              10.2    Amended and Restated CH-Twenty, Inc. Capital
                      Accumulation Plan, effective March 15, 1999,
                      filed herewith.

              10.3    Amendment No. 12 to Atlantic Richfield Company
                      1985 Executive Long-Term Incentive Plan,
                      effective March 31, 1999, filed herewith.

              10.4    Amendment No. 13 to Atlantic Richfield Company
                      1985 Executive Long-Term Incentive Plan, effective
                      March 31, 1999, filed herewith.


              27      Financial Data Schedule.

      (b)  Reports on Form 8-K

           The following Current Reports on Form 8-K were filed during the
           quarter ended September 30, 1999 and through the date hereof.

                 Date of Report           Item No.         Financial Statements
                 --------------           --------         --------------------

                 August 30, 1999          5                        None
                 September 14, 1999       5                        None


                                       33
<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/ ALLAN L. COMSTOCK
Dated:  November 10, 1999                         ----------------------------
                                                          (signature)
                                                       Allan L. Comstock
                                                 Vice President and Controller
                                                 (Duly Authorized Officer and
                                                 Principal Accounting Officer)

                                       34

<PAGE>

                                                                       Exhibit 2

                              AGREEMENT AND PLAN

                                   OF MERGER

                                     Among

                                BP AMOCO p.l.c.,

                           ATLANTIC RICHFIELD COMPANY

                                      and

                             PRAIRIE HOLDINGS, INC.

                          Dated as of March 31 , 1999



                         As amended as of July 12, 1999
<PAGE>

                               TABLE OF CONTENTS


                                                                           Page



                     ARTICLE I The Closing and the Merger
<TABLE>
<CAPTION>


<S>                                                                         <C>
1.1.    Closing............................................................. 2
1.2.    The Share Exchange and the Merger................................... 2
1.3.    Conversion and Exchange of Shares................................... 3
1.4.    Surrender and Payment............................................... 6
1.5.    ARCO Stock Options; Other Stock-Based Plans......................... 9
1.6.    Fractional BP Amoco Depositary Shares...............................13
1.7.    The Surviving Corporation...........................................13
1.8.    Lost, Stolen or Destroyed Certificates..............................14


                   ARTICLE II Representations and Warranties


2.1.    Representations and Warranties of BP Amoco and ARCO................. 14
        2.1.1.  Organization, Good Standing and Qualification............... 14
        2.1.2.  Capital Structure........................................... 15
        2.1.3.  Corporate Authority; Approval and Fairness.................. 18
        2.1.4.  Governmental Filings; No Violations......................... 19
        2.1.5.  Reports; Financial Statements............................... 21
        2.1.6.  Absence of Certain Changes.................................. 23
        2.1.7.  Litigation and Liabilities.................................. 23
        2.1.8.  Takeover Statutes........................................... 24
        2.1.9.  Brokers and Finders......................................... 24
        2.1.10. Ownership of Other Party's Common Stock..................... 25
        2.1.11. Merger Sub.................................................. 25
        2.1.12. ARCO Employee Benefit Plans................................. 25
        2.1.13. Environmental Matters....................................... 26
        2.1.14. ARCO Rights Plan............................................ 27
        2.1.15. ARCO Joint Ventures; Exclusivity Arrangements............... 27
        2.1.16. Tax Matters................................................. 28
2.2.    Vastar.............................................................. 28
</TABLE>

                                      -i-
<PAGE>

<TABLE>
<CAPTION>
                              ARTICLE III Covenants

<S>     <C>                                                                 <C>
3.1.    Interim Operations.................................................. 28
        3.1.1.  Interim Operations of BP Amoco.............................. 28
        3.1.2.  Interim Operations of ARCO.................................. 30
        3.1.3.  Consultation as to Material Contracts....................... 35
3.2.    ARCO Acquisition Proposals.......................................... 35
3.3.    Information Supplied................................................ 37
        3.3.1.  Registration Statement...................................... 37
        3.3.2.  BP Amoco Documents.......................................... 38
3.4.    Shareholders Meetings............................................... 39
3.5.    Filings; Other Actions; Notification................................ 40
3.6.    Access.............................................................. 42
3.7.    Publicity........................................................... 43
3.8.    Benefits and Other Matters.......................................... 43
        3.8.1.  Employee Benefits........................................... 43
        3.8.2.  Director and Officer Liability.............................. 46
3.9.    Expenses............................................................ 47
3.10.   Takeover Statutes................................................... 47
3.11.   Dividends........................................................... 47
3.12.   Listing Applications................................................ 47
3.13.   Letters of Accountants.............................................. 48
3.14.   Agreements of ARCO Affiliates....................................... 48
3.15.   Accounting Matters.................................................. 48
3.16.   Tax Matters......................................................... 49
3.17.   Vastar.............................................................. 49
3.18.   Section 103......................................................... 49

                             ARTICLE IV Conditions

4.1.    Conditions to Each Party's Obligation to Effect the Merger.......... 49
        4.1.1.  Shareholder Approvals....................................... 49
        4.1.2.  Regulatory Consents......................................... 49
        4.1.3.  Laws and Orders............................................. 50
        4.1.4.  Effectiveness of Form F-4................................... 50
        4.1.5.  Exchange Listings........................................... 50
</TABLE>

                                      -ii-
<PAGE>

<TABLE>
<CAPTION>

<S>     <C>                                                                <C>
4.2.    Conditions to Obligations of BP Amoco and Merger Sub................ 50
        4.2.1.  Representations and Warranties of ARCO...................... 50
        4.2.2.  Performance of Obligations of ARCO.......................... 51
4.3.    Conditions to Obligation of ARCO.................................... 51
        4.3.1.  Representations and Warranties.............................. 51
        4.3.2.  Performance of Obligations of BP Amoco...................... 51
        4.3.3.  Tax Opinion................................................. 52


                             ARTICLE V Termination


5.1.    Termination by Mutual Consent....................................... 52
5.2.    Termination by Either BP Amoco or ARCO.............................. 52
5.3.    Termination by BP Amoco............................................. 53
5.4.    Termination by ARCO................................................. 53
5.5.    Effect of Termination and Abandonment............................... 53

                     ARTICLE VI Miscellaneous and General


6.1.    Survival............................................................ 55
6.2.    Modification or Amendment........................................... 56
6.3.    Waiver.............................................................. 56
6.4.    Failure or Indulgence Not Waiver; Remedies Cumulative............... 56
6.5.    Counterparts........................................................ 56
6.6.    GOVERNING LAW AND VENUE; WAIVER OF JURY TRIAL....................... 56
6.7.    Notices............................................................. 57
6.8.    Entire Agreement.................................................... 59
6.9.    Obligations of BP Amoco and of ARCO................................. 60
6.10.   Severability........................................................ 60
6.11.   Interpretation...................................................... 60
6.12.   Assignment.......................................................... 60
</TABLE>

                                     -iii-
<PAGE>

                              Index of Defined Terms
<TABLE>
<CAPTION>

<S>                                                                         <C>
Affiliate................................................................... 15
Agreement...................................................................  1
ARCO........................................................................  1
ARCO $2.80 Preference Stock................................................. 17
ARCO $3.00 Preference Stock................................................. 16
ARCO Acquisition Proposal................................................... 35
ARCO Affiliates............................................................. 48
ARCO Alternative Agreement.................................................. 54
ARCO Audit Date............................................................. 22
ARCO Common Shares..........................................................  1
ARCO Compensation and Benefit Plans......................................... 26
ARCO Disclosure Letter...................................................... 14
ARCO Executive Officers..................................................... 24
ARCO Preference Stock....................................................... 17
ARCO Preferred Stock........................................................ 16
ARCO Proxy Statement........................................................ 37
ARCO Reports................................................................ 22
ARCO Representatives........................................................ 35
ARCO Required Consents...................................................... 20
ARCO Requisite Vote......................................................... 18
ARCO Stock Option...........................................................  9
ARCO Stock Plans............................................................ 17
ARCO Stockholders Meeting................................................... 39
ARCO Termination Amount..................................................... 54
Audit Date.................................................................. 22
Bankruptcy and Equity Exception............................................. 18
BP Amoco....................................................................  1
BP Amoco 20-F............................................................... 21
BP Amoco ADRs...............................................................  3
BP Amoco Audit Date......................................................... 21
BP Amoco Circular........................................................... 38
BP Amoco Depositary Shares..................................................  3
BP Amoco Disclosure Letter.................................................. 14
BP Amoco Documents.......................................................... 39
BP Amoco Executive Directors................................................ 24
BP Amoco First Preference Shares............................................ 15
BP Amoco Listing Document................................................... 38
BP Amoco Ordinary Shares....................................................  3
</TABLE>

                                      -iv-
<PAGE>

<TABLE>
<S>                                                                        <C>
BP Amoco Reports............................................................ 21
BP Amoco Required Consents.................................................. 20
BP Amoco Requisite Vote..................................................... 18
BP Amoco Second Preference Shares........................................... 16
BP Amoco Shareholder Meeting................................................ 39
BP Amoco Shares.............................................................  6
BP Amoco Termination Amount................................................. 55
BP Amoco Voting Shares...................................................... 18
Canceled ARCO Share.........................................................  3
Certificate.................................................................  4
Certificate of Merger.......................................................  3
CH-Twenty...................................................................  3
CH-Twenty ARCO Shares.......................................................  3
Closing.....................................................................  2
Closing Date................................................................  2
Code........................................................................  1
Companies Act............................................................... 15
Confidentiality Agreement................................................... 43
Constituent Corporations....................................................  1
Contracts................................................................... 20
Deposit Agreement...........................................................  4
Depositary..................................................................  4
DGCL........................................................................  1
Directors' Plan............................................................. 12
Disclosure Letter........................................................... 14
Effective Time..............................................................  3
Eligible ARCO Shareholders..................................................  1
ELTIP....................................................................... 10
Encumbrance................................................................. 16
Environmental Law........................................................... 26
ERISA....................................................................... 25
Exchange Act................................................................ 15
Exchange Agent..............................................................  6
Exchange Ratio..............................................................  3
Excluded ARCO Shares........................................................  3
Exclusivity Agreements...................................................... 27
Exon-Florio................................................................. 19
Form F-4.................................................................... 37
FSA......................................................................... 39
Governmental Consents....................................................... 49
Governmental Entity......................................................... 20
</TABLE>

                                      -v-
<PAGE>

<TABLE>
<S>                                                                        <C>
Hazardous Substance......................................................... 27
HSR Act..................................................................... 19
Indemnitees................................................................. 46
IPA......................................................................... 45
Joint Venture Agreements.................................................... 27
Law......................................................................... 21
Material Adverse Effect..................................................... 15
Merger......................................................................  1
Merger Consideration........................................................  3
Merger Sub..................................................................  1
Merger Sub Common Stock.....................................................  4
MMC......................................................................... 19
Nominee.....................................................................  6
NYSE........................................................................ 13
Option Schemes.............................................................. 16
Order....................................................................... 50
Ordinary Share Election.....................................................  6
Parties.....................................................................  1
Party.......................................................................  1
Person...................................................................... 15
Regulation.................................................................. 19
Reports..................................................................... 23
Rights...................................................................... 27
Rights Agreement............................................................ 27
SEC......................................................................... 12
Securities Act.............................................................. 12
Stock Option Agreement......................................................  1
Subsidiary.................................................................. 15
Superior Proposal........................................................... 36
Surviving Corporation.......................................................  2
Takeover Panel.............................................................. 20
Takeover Statute............................................................ 24
Termination Date............................................................ 52
U.K. GAAP................................................................... 22
U.S. GAAP................................................................... 22
Vastar...................................................................... 17
</TABLE>

                                      -vi-
<PAGE>

          This AGREEMENT AND PLAN OF MERGER, dated as of March 31, 1999, as
amended as of July ___, 1999 (this "Agreement"), among BP AMOCO p.l.c. ("BP
                                    ---------                            --
Amoco"), an English public limited company, ATLANTIC RICHFIELD COMPANY, a
- -----
Delaware corporation ("ARCO"), and PRAIRIE HOLDINGS, INC., a Delaware
                       ----
corporation and a direct wholly owned subsidiary of BP Amoco ("Merger Sub" and,
                                                               ----------
together with ARCO, the "Constituent Corporations");
                         ------------------------

                             W I T N E S S E T H :

          WHEREAS, the respective Boards of Directors of each of ARCO, BP Amoco
and Merger Sub (each, a "Party" and, together, the "Parties") have each
                         -----                      -------
determined that it is in the best interests of their respective companies and
stockholders or shareholders, as the case may be, to combine their respective
businesses;

          WHEREAS, in furtherance of such combination, the respective Boards of
Directors of ARCO and Merger Sub have each adopted resolutions approving this
Agreement and declaring its advisability and approving the merger (the "Merger")
                                                                        ------
of Merger Sub with and into ARCO in accordance with the Delaware General
Corporation Law, as amended (the "DGCL"), upon the terms and subject to the
                                  ----
conditions set forth herein;

          WHEREAS, in furtherance of such combination, the Board of Directors of
BP Amoco adopted a resolution approving this Agreement and the Merger, upon the
terms and subject to the conditions set forth herein;

          WHEREAS, it is intended that, for U.S. federal income tax purposes,
the DSC II Share Exchange (as defined herein) and the Merger shall qualify as a
reorganization under the provisions of Section 368(a) of the Internal Revenue
Code of 1986, as amended, and the rules and regulations promulgated thereunder
(the "Code") and that the holders of ARCO Common Shares who will not be "five
      ----
percent transferee shareholders" as defined in Treasury Regulation Section
1.367(a)-3(c)(5)(ii) or who enter into five-year gain recognition agreements in
the form provided in Treasury Regulation Section 1.367(a)-8(b) ( "Eligible ARCO
                                                                  -------------
Shareholders") not recognize taxable gain with respect to the DSC II Share
- ------------
Exchange or the Merger pursuant to Section 367(a) of the Code (except with
respect to cash received in lieu of fractional share interests);

          WHEREAS, as an inducement to the willingness of BP Amoco to enter into
this  Agreement, the Board of Directors of ARCO has approved the grant to BP
Amoco of an option to purchase shares of common stock, par value $2.50 per
share, of ARCO ("ARCO Common Shares") pursuant to a stock option agreement,
                 ------------------
dated as of March 31, 1999, between ARCO and BP Amoco (the "Stock Option
                                                            ------------
Agreement"), and
- ---------
<PAGE>

each of ARCO and BP Amoco has duly authorized, executed and delivered the Stock
Option Agreement; and

          WHEREAS, ARCO and BP Amoco desire to make certain representations,
warranties, covenants and agreements in connection with this Agreement.

          NOW, THEREFORE, in consideration of the mutual representations,
warranties, covenants and agreements contained herein, the parties hereto,
intending to be legally bound, hereby agree as follows:

                                   ARTICLE I

                          The Closing and the Merger

          I.1.  Closing.  The closing of the Merger (the "Closing") shall take
                -------                                   -------
place (i) at the offices of Linklaters & Paines, One Silk Street, London,
England, with a meeting to be held simultaneously at the offices of Sullivan &
Cromwell, 125 Broad Street, New York, New York, for the delivery of certain
documents in connection therewith, at a time to be agreed by the Parties on the
third business day after the day on which the last to be fulfilled or waived of
the conditions set forth in Article IV (other than those conditions that by
their nature are to be fulfilled at the Closing, but subject to the fulfillment
or waiver of such conditions) shall be fulfilled or waived in accordance with
this Agreement or (ii) at such other places and time and/or on such other date
as ARCO and BP Amoco may agree in writing (the "Closing Date").
                                                ------------

          I.2.   The Share Exchange and the Merger.
                 ---------------------------------

          I.2.1. Upon the terms and subject to the conditions set forth in the
     Share Exchange Agreement, dated as of July __, 1999 (the "Share Exchange
                                                               --------------
     Agreement"), among BP Amoco, ARCO and ARCO DSC II, Inc., a Delaware
     ---------
     corporation ("DSC II"), prior to the Effective Time (as defined in Section
                   ------
     1.2.3), each ARCO Common Share then owned by DSC II shall be exchanged for
     a number of ordinary shares, of nominal value $0.50 each, of BP Amoco
     (each, a "BP Amoco Ordinary Share") equal to the Exchange Ratio (as defined
               -----------------------
     in Section 1.3.2), which shall be delivered to DSC II in the form of BP
     Amoco Depositary Shares (as defined in Section 1.3.2)  (the "DSC II Share
                                                                  ------------
     Exchange").  The consummation of the DSC II Share Exchange shall not be a
     --------
     condition to the obligations of the Parties to effect the Merger.

          1.2.2. Upon the terms and subject to the conditions set forth in this
     Agreement, at the Effective Time (as defined in Section 1.2.3), Merger Sub
     shall be merged with and into ARCO in accordance with the DGCL, whereupon
     the
<PAGE>

     separate existence of Merger Sub shall cease, and ARCO shall be the
     surviving corporation in the Merger (the "Surviving Corporation") and shall
                                               ---------------------
     continue to be governed by the laws of the State of Delaware, and the
     separate corporate existence of ARCO, with all its rights, privileges,
     immunities, powers and franchises, shall continue unaffected by the Merger
     except as set forth in this Article I. The Merger shall have the effects
     specified in the DGCL.

          1.2.3. As soon as practicable after satisfaction or waiver (to the
     extent herein permitted) of the conditions to the obligations of the
     Parties to consummate the Merger set forth in Article IV, ARCO and Merger
     Sub will cause a certificate of merger (the "Certificate of Merger") to be
                                                  ---------------------
     executed and filed with the Secretary of State of the State of Delaware and
     make all other filings or recordings required by applicable law in
     connection with the Merger.  The Merger shall become effective at such time
     as the Certificate of Merger is duly filed with the Secretary of State of
     the State of Delaware or at such later time as is specified in the
     Certificate of Merger in accordance with the DGCL (the "Effective Time").
                                                             --------------

          I.3.   Conversion and Exchange of Shares.  At the Effective Time:
                 ---------------------------------

          I.3.1. Each ARCO Common Share owned by BP Amoco, ARCO or any
     Subsidiary (as defined in Section 2.1.1) of BP Amoco or ARCO (other than
     CH-Twenty Holdings, LLC, a Delaware limited liability company and a
     Subsidiary of ARCO ("CH-Twenty")) immediately prior to the Effective Time,
                          ---------
     including the ARCO Common Shares acquired by BP Amoco in the DSC II Share
     Exchange (each, a "Canceled ARCO Share"), shall, by virtue of the Merger,
                        -------------------
     and without any action on the part of the holder thereof, no longer be
     outstanding, shall be canceled and retired without payment of any
     consideration therefor and shall cease to exist.  The ARCO Common Shares
     owned by CH-Twenty immediately prior to the Merger (if any) (the "CH-Twenty
                                                                       ---------
     ARCO Shares" and, together with the Canceled ARCO Shares, the "Excluded
     -----------                                                    --------
     ARCO Shares") shall remain outstanding, without change, after the Effective
     -----------
     Time, and no consideration shall be delivered in exchange therefor.

          I.3.2. Each ARCO Common Share outstanding immediately prior to the
     Effective Time, other than Excluded ARCO Shares, shall be converted into
     and shall be canceled in exchange for the right to receive 4.92 (the

     "Exchange Ratio") BP Amoco Ordinary Shares, which shall be delivered to the
     ---------------
     holders of ARCO Common Shares (other than Excluded ARCO Shares) (i) in the
     form of American depositary shares (the "BP Amoco Depositary Shares"), each
                                              --------------------------
     representing the right to receive six BP Amoco Ordinary Shares, or (ii) if
     and to the extent elected by any such holder in a timely manner in
     accordance with Section 1.4.1, in the

                                      -3-
<PAGE>

     form of BP Amoco Ordinary Shares, in registered form, rather than BP Amoco
     Depositary Shares (the "Merger Consideration"). The BP Amoco Depositary
                             --------------------
     Shares may be evidenced by one or more receipts ("BP Amoco ADRs") issued in
                                                       -------------
     accordance with the Amended and Restated Deposit Agreement, dated as of
     December 31, 1998, among BP Amoco, Morgan Guaranty Trust Company of New
     York, as Depositary (the "Depositary"), and the holders from time to time
                               ----------
     of BP Amoco ADRs (as amended or supplemented through the Effective Time,
     the "Deposit Agreement"). At the Effective Time, all ARCO Common Shares
          -----------------
     (other than any CH-Twenty ARCO Shares) shall no longer be outstanding,
     shall be canceled and retired and shall cease to exist, and each
     certificate (a "Certificate") formerly representing any of such ARCO Common
                     -----------
     Shares (other than Excluded ARCO Shares) and each uncertificated ARCO
     Common Share (other than Excluded ARCO Shares) shall thereafter represent
     only the right to the Merger Consideration and the right, if any, to
     receive pursuant to Section 1.6 cash in lieu of fractional interests in BP
     Amoco Depositary Shares (such fractional interests to include, for all
     purposes under this Agreement, Excess Ordinary Shares (as defined in
     Section 1.4.1) representing such a fractional interest in accordance with
     Section 1.6) and any dividend or distribution pursuant to Section 1.4.6, in
     each case without interest. BP Amoco shall, following the Closing, pay all
     stamp duties, stamp duty reserve tax and other taxes and similar levies
     imposed in connection with the issuance or creation of the BP Amoco
     Ordinary Shares, BP Amoco Depositary Shares and any BP Amoco ADRs in
     connection therewith.

          I.3.3. Each share of common stock of Merger Sub, par value $.001 per
     share ("Merger Sub Common Stock"), outstanding immediately prior to the
             -----------------------
     Effective Time shall be canceled and, in consideration for the issuance of
     the BP Amoco Ordinary Shares referred to in Section 1.3.4, the Surviving
     Corporation shall issue to BP Amoco at the Effective Time such number of
     shares of common stock as is equal to the number of ARCO Common Shares
     outstanding immediately prior to the Effective Time (excluding any CH-
     Twenty ARCO Shares) with the same rights, powers and privileges as the ARCO
     Common Shares, which shares of common stock, together with the CH-Twenty
     ARCO Shares, shall constitute the only outstanding shares of common stock
     of the Surviving Corporation.

          I.3.4. In consideration of the issue to BP Amoco by the Surviving
     Corporation of shares of common stock of the Surviving Corporation pursuant
     to Section 1.3.3, BP Amoco shall issue, in accordance with Section 1.4,
     such number of BP Amoco Ordinary Shares as is equal to (a) the number of
     ARCO Common Shares outstanding immediately prior to the Effective Time
     (other than the Excluded ARCO Shares) multiplied by the Exchange Ratio to
     permit (i) the

                                      -4-
<PAGE>

     issuance of BP Amoco Depositary Shares and (ii) if and to the extent
     elected by any holder of such ARCO Common Shares in a timely manner in
     accordance with Section 1.4.1, the delivery of BP Amoco Ordinary Shares, in
     registered form, to the holders of such ARCO Common Shares for the purpose
     of giving effect to the delivery of the Merger Consideration referred to in
     Section 1.3.2 , less (b) the aggregate number of BP Amoco Ordinary Shares
     that would (but for the provisions of Section 1.6) be issued in respect of
     fractional interests in BP Amoco Depositary Shares.

          I.3.5.  In the event that, subsequent to the date of this Agreement
     but prior to the Effective Time, ARCO changes the number of ARCO Common
     Shares, or BP Amoco changes the number of BP Amoco Ordinary Shares, issued
     and outstanding as a result of a stock split, stock combination, stock
     dividend, recapitalization, redenomination of share capital or other
     similar transaction, the Exchange Ratio and other items dependent thereon
     (including the number of BP Amoco Ordinary Shares to be exchanged for each
     ARCO Common Share in the DSC II Share Exchange) shall be appropriately
     adjusted.  Without limiting the generality of the foregoing, in the event
     that the proposed one-for-one subdivision of the ordinary share capital of
     BP Amoco (the "Share Subdivision") is approved by the requisite vote of
                    -----------------
     shareholders of BP Amoco at the BP Amoco Shareholder Meeting (as defined in
     Section 3.4) and otherwise becomes effective prior to the Effective Time,
     the Exchange Ratio shall for all purposes under this Agreement be 9.84,
     subject to any further adjustments pursuant to this Section 1.3.5,  and
     references herein to the nominal value of each BP Amoco Ordinary Share
     shall be deemed to be $0.25.

          I.3.6.  Each share of ARCO $3.00 Preference Stock and each share of
     ARCO $2.80 Preference Stock (each as defined in Section 2.1.2.2)
     outstanding immediately prior to the Effective Time shall remain
     outstanding, without change, after the Effective Time, and no consideration
     shall be delivered in exchange therefor; provided, however, BP Amoco agrees
                                              --------  -------
     that (i) from and after the Effective Time, shares of ARCO $3.00 Preference
     Stock and ARCO $2.80 Preference Stock shall be convertible into BP Amoco
     Ordinary Shares, deliverable in the form of BP Amoco Depositary Shares,
     (ii) the number of BP Amoco Ordinary Shares into which each share of ARCO
     $3.00 Preference Stock and each share of ARCO $2.80 Preference Stock shall
     be convertible shall be equal in each case to the number of ARCO Common
     Shares into which such share was convertible immediately prior to the
     Effective Time, multiplied by the Exchange Ratio (subject to any adjustment
     pursuant to Section 1.3.5, but without any adjustment pursuant to Section
     1.3.5 in the conversion rates between such ARCO Preference Stock and ARCO
     Common Shares for changes in ARCO

                                      -5-
<PAGE>

     Common Shares prior to the Effective Time, for which changes the terms of
     the ARCO $3.00 Preference Stock and the ARCO $2.80 Preference Stock
     contained in the restated certificate of incorporation of ARCO shall
     provide the relevant adjustment, if any, and in each case subject to future
     adjustments after the Effective Time in accordance with ARCO's restated
     certificate of incorporation) and (iii) BP Amoco shall pay all stamp
     duties, stamp duty reserve tax and other taxes and similar levies imposed
     in connection with the issuance or creation of any BP Amoco Depositary
     Shares and any BP Amoco ADRs in connection therewith that may be issued
     upon the conversion of shares of ARCO $3.00 Preference Stock or ARCO $2.80
     Preference Stock in accordance with their terms.

          I.4.   Surrender and Payment.
                 ---------------------

          I.4.1. Prior to the Effective Time, BP Amoco shall appoint an agent
     reasonably acceptable to ARCO as exchange agent (the "Exchange Agent") for
                                                           --------------
     the purpose of accepting Certificates to be surrendered by holders of ARCO
     Common Shares in exchange for BP Amoco Depositary Shares or, if and to the
     extent elected by a holder of ARCO Common Shares in the manner provided in
     this Section 1.4.1, for BP Amoco Ordinary Shares in registered form, and
     letters of transmittal as described in this Section 1.4.1.  Promptly after
     the Effective Time, the Surviving Corporation will send, or will cause the
     Exchange Agent to send, to each holder of record as of the Effective Time
     of ARCO Common Shares (other than holders of Excluded ARCO Shares) (i) a
     letter of transmittal, in such form or forms as ARCO and BP Amoco may
     reasonably agree, for use in effecting delivery of Certificates to the
     Exchange Agent and including a form of election by which each holder of
     ARCO Common Shares may elect, subject to the provisions of this Section
     1.4.1, to receive (the "Ordinary Share Election") all or  part of the
                             -----------------------
     Merger Consideration to which such holder is entitled in the form of BP
     Amoco Ordinary Shares in registered form, rather than in the form of BP
     Amoco Depositary Shares (such BP Amoco Ordinary Shares or BP Amoco
     Depositary Shares to be received by a holder being referred to in this
     Agreement as "BP Amoco Shares"), and (ii) instructions for surrendering
                   ---------------
     ARCO Common Shares in exchange for the BP Amoco Shares, and any cash in
     lieu of fractional interests in BP Amoco Depositary Shares and any cash
     dividends or other distributions, that such holder has the right to receive
     pursuant to this Article I.  ARCO, acting as agent for each holder of
     record as of the Effective Time of ARCO Common Shares (other than Excluded
     ARCO Shares), shall prior to the Effective Time appoint Exchange Nominees
     Limited or such other agent as may be reasonably acceptable to BP Amoco
     (the "Nominee"), as nominee and agent for and on behalf of the holders of
           -------
     ARCO Common Shares in connection with the issuance of BP Amoco Depositary
     Shares or BP Amoco Ordinary Shares in

                                      -6-
<PAGE>

     accordance with this Article I, subject to the terms and conditions of this
     Agreement and an exchange agent and nominee agreement among BP Amoco, ARCO,
     the Exchange Agent and the Nominee. BP Amoco shall issue the BP Amoco
     Ordinary Shares referred to in Section 1.3.4 in registered form to the
     Nominee. The BP Amoco Ordinary Shares held by the Nominee shall be
     deposited by the Nominee or on its behalf with the Depositary (or as it may
     direct) as and when required for the issuance of BP Amoco Depositary
     Shares, or delivered by the Nominee to holders of ARCO Common Shares in
     accordance with any Ordinary Share Election, in each case in accordance
     with this Article I. To the extent required, the Nominee will requisition
     from the Depositary, from time to time, such number of BP Amoco Depositary
     Shares, in such denominations as the Nominee shall specify, as are issuable
     in respect of ARCO Common Shares properly delivered to the Exchange Agent
     that are not subject to an Ordinary Share Election.

          Each holder of ARCO Common Shares entitled to receive the Merger
     Consideration in accordance with Section 1.3.2 may exercise the Ordinary
     Share Election only by returning to the Exchange Agent prior to the close
     of business on the 42nd day following the Closing Date a properly completed
     letter of transmittal and form of election. Any such holder of ARCO Common
     Shares may make an Ordinary Share Election with respect to any or all of
     such holder's ARCO Common Shares, provided that (i) the number of BP Amoco
                                       --------
     Ordinary Shares to which any such holder will be entitled in respect of
     such Ordinary Share Election shall not be less than six and shall be an
     integral multiple of six; (ii) any number of BP Amoco Ordinary Shares less
     than six or in excess of an integral multiple thereof ("Excess Ordinary
                                                             ---------------
     Shares") shall constitute a fractional interest in a BP Amoco Depositary
     ------
     Share; and (iii) such holder will therefore be entitled only to cash in
     lieu of Excess Ordinary Shares in accordance with Section 1.6.  Only BP
     Amoco Depositary Shares shall be issued as Merger Consideration with
     respect to ARCO Common Shares for which the holder of such ARCO Common
     Shares shall not have exercised an Ordinary Share Election prior to the
     close of business on the 42nd day following the Closing Date or for which
     the  holder shall have delivered to the Exchange Agent prior to such time a
     letter of transmittal declining to make an Ordinary Share Election.

          I.4.2.  Each holder of any ARCO Common Shares that have been converted
     into a right to receive the consideration set forth in Section 1.3.2 shall,
     (i) in the case of a holder of a Certificate, upon surrender to the
     Exchange Agent of such Certificate, together with a properly completed
     letter of transmittal covering the ARCO Common Shares represented by such
     Certificate and (ii) in the case of a holder of uncertificated ARCO Common
     Shares, upon delivery to the

                                      -7-
<PAGE>

     Exchange Agent prior to the close of business on the 42nd day following the
     Closing Date of a properly completed letter of transmittal and, after such
     time, without any further action on the part of such holder of
     uncertificated ARCO Common Shares, in case (i) and in case (ii), be
     entitled to receive (x) the number of BP Amoco Depositary Shares or BP
     Amoco Ordinary Shares (excluding any fractional interest in a BP Amoco
     Depositary Share), to which such holder is entitled in respect of such ARCO
     Common Shares pursuant to Sections 1.3.2 and 1.4.1 and (y) a check in the
     amount (after giving effect to any required tax withholdings) of (I) any
     cash in lieu of fractional interests in BP Amoco Depositary Shares to be
     paid pursuant to Section 1.6, plus (II) any cash dividends or other
     distributions that such holder has the right to receive pursuant to Section
     1.4.6. Until such time as any such holder of ARCO Common Shares has become
     entitled to receive such BP Amoco Shares, such holder's ARCO Common Shares
     (whether or not represented by a Certificate) shall, after the Effective
     Time, represent for all purposes only the right to receive the Merger
     Consideration to which such holder is entitled and the applicable amounts
     provided in the foregoing clause (y).

          I.4.3.  If any BP Amoco Shares are to be issued or transferred to a
     person other than the registered holder of the ARCO Common Shares
     represented by a Certificate or Certificates surrendered with respect
     thereto, it shall be a condition to such issue or transfer that the
     Certificate or Certificates so surrendered shall be properly endorsed or
     otherwise be in proper form for transfer and that the person requesting
     such issue or transfer shall pay to the Exchange Agent any transfer or
     other taxes required as a result of such issue or transfer to a person
     other than the registered holder of such ARCO Common Shares or establish to
     the satisfaction of the Exchange Agent that such tax has been paid or is
     not payable.

          I.4.4.  After the close of the stock transfer books of ARCO on the day
     prior to the Effective Time, there shall be no further registration of
     transfers of ARCO Common Shares that were outstanding prior to the
     Effective Time.  After the Effective Time, Certificates presented to the
     Surviving Corporation for transfer shall be canceled and exchanged for the
     consideration provided for, and in accordance with the procedures set
     forth, in this Article I.

          I.4.5.  After the 42nd day after the Closing, any BP Amoco Ordinary
     shares and any cash amounts then held by the Nominee shall be deposited by
     the Nominee with the Depositary or on its behalf for the issuance or
     delivery to the Exchange Agent, as and when required, of BP Amoco
     Depositary Shares and any cash amounts which may thereafter be issuable or
     deliverable to holders of ARCO Common Shares.  Any BP Amoco Depositary
     Shares issuable or deliverable in

                                      -8-
<PAGE>

     respect of ARCO Common Shares pursuant to this Article I and any cash in
     lieu of fractional interests in BP Amoco Depositary Shares payable pursuant
     to Section 1.6, plus any cash dividend or other distribution that such
     holder has the right to receive pursuant to Section 1.4.6, that remains
     unclaimed by any holder of ARCO Common Shares six months after the
     Effective Time shall be held by or on behalf of the Depositary, subject to
     the instruction of BP Amoco, in an account or accounts designated for such
     purpose. BP Amoco shall not be liable to any holder of ARCO Common Shares
     for any securities delivered or any amount paid by the Depositary to a
     public official pursuant to applicable abandoned property laws. Any cash
     remaining unclaimed by holders of ARCO Common Shares three years after the
     Effective Time (or such earlier date immediately prior to such time as such
     cash would otherwise escheat to or become property of any governmental
     entity or as is otherwise provided by applicable Law (as defined in Section
     2.1.4.2)) shall, to the extent permitted by applicable Law, become the
     property of the Surviving Corporation or BP Amoco, as BP Amoco may
     determine.

          I.4.6.  No dividends, interest or other distributions with respect to
     securities of BP Amoco or the Surviving Corporation issuable with respect
     to ARCO Common Shares shall be paid to any holder of ARCO Common Shares
     until such holder shall have become entitled, in accordance with Section
     1.4.2, to receipt of the Merger Consideration and the applicable amounts
     provided in Section 1.4.2.  Subject to the effect of applicable Law, upon
     such holder becoming entitled to receipt of the Merger Consideration, there
     shall be issued and/or paid to the holder of the BP Amoco Shares issued in
     exchange therefor, without interest, (A) at the time of such entitlement,
     the dividends or other distributions payable with respect to such BP Amoco
     Shares with a record date after the Effective Time and a payment date on or
     prior to the date of such entitlement and not previously paid and (B) at
     the appropriate payment date, the dividends or other distributions payable
     with respect to such BP Amoco Shares with a record date after the Effective
     Time but with a payment date subsequent to the date of such entitlement.
     For purposes of dividends or other distributions in respect of BP Amoco
     Shares, all BP Amoco Shares to be issued pursuant to the Merger shall be
     deemed issued and outstanding as of the Effective Time.

          I.4.7.  The Parties may, by mutual agreement and without amending this
     Agreement in accordance with Section 6.2, make any modifications to the
     terms of or procedures for the Share Election, provided that any such
                                                    --------
     modification will not adversely affect the entitlement of holders of ARCO
     Common Shares to the Merger Consideration and that such modification shall
     be filed with the Secretary of ARCO and made available to the stockholders
     of ARCO, without cost, upon request.

                                      -9-
<PAGE>

          I.5.   ARCO Stock Options; Other Stock-Based Plans.
                 -------------------------------------------

          I.5.1. At the Effective Time, each stock option to purchase ARCO
     Common Shares under any ARCO Stock Plan (as defined in Section 2.1.2.2)
     (each, an "ARCO Stock Option") which is then outstanding and unexercised
                -----------------
     shall cease to represent a right to acquire ARCO Common Shares and shall be
     converted automatically into an option to purchase BP Amoco Ordinary
     Shares, to be issued in the form of BP Amoco Depositary Shares, and BP
     Amoco shall assume each such ARCO Stock Option subject to the terms of the
     relevant ARCO Stock Plan, and the agreement evidencing the grant
     thereunder; provided, however, that from and after the Effective Time, (i)
                 --------  -------
     the number of BP Amoco Ordinary Shares purchasable, in the form of BP Amoco
     Depositary Shares, upon exercise of each such ARCO Stock Option shall be
     equal to the number of ARCO Common Shares that were purchasable under such
     ARCO Stock Option immediately prior to the Effective Time (without taking
     into account any Dividend Share Credits under any ARCO Stock Plan),
     multiplied by the Exchange Ratio and rounded down to the number of BP Amoco
     Ordinary Shares representing the nearest whole number of BP Amoco
     Depositary Shares issuable in respect of such exercise, and (ii) the per BP
     Amoco Ordinary Share exercise price under each such ARCO Stock Option shall
     be obtained by dividing the per share exercise price of each such ARCO
     Stock Option by the Exchange Ratio, and rounding down to the nearest cent.
     Notwithstanding the foregoing, the number of BP Amoco Ordinary Shares and
     the per BP Amoco Ordinary Share exercise price of each ARCO Stock Option
     which is intended to be an "incentive stock option" (as defined in Section
     422 of the Code) shall be adjusted in accordance with the requirements of
     Section 424 of the Code.  Accordingly, with respect to any incentive stock
     options, BP Amoco Ordinary Shares representing a fractional interest in a
     BP Amoco Depositary Share shall be rounded down to the number of BP Amoco
     Ordinary Shares representing the nearest whole number of BP Amoco
     Depositary Shares and where necessary the per BP Amoco Ordinary Share
     exercise price shall be rounded up to the nearest cent.

          I.5.2.  Shares of Restricted Stock and Performance-Based Restricted
     Stock outstanding and held by participants in any ARCO Stock Plan
     immediately prior to the Effective Time shall be converted into and shall
     be canceled in exchange for the right to receive BP Amoco Shares in
     accordance with Sections 1.3.2 and 1.4.1.

          I.5.3.  The obligation of ARCO to deliver ARCO Common Shares pursuant
     to Article III, Subsection 3(b)(v)(1) of the ARCO 1985 Executive Long-

                                      -10-
<PAGE>

     Term Incentive Plan (the "ELTIP"), as amended through the date hereof, in
                               -----
     respect of Contingent Restricted Stock upon the Change of Control
     represented by the Merger shall be satisfied through the delivery by BP
     Amoco of (i) a number of BP Amoco Ordinary Shares (to be issued in the form
     of BP Amoco Depositary Shares) equal to the number of ARCO Common Shares
     that were otherwise so deliverable multiplied by the Exchange Ratio and
     rounded down to the number of BP Amoco Ordinary Shares representing the
     nearest whole number of BP Amoco Depositary Shares issuable in respect of
     such ARCO Common Shares, and (ii) such other amounts payable in respect of
     such ARCO Common Shares pursuant to this Article I.

          I.5.4.  With respect to Dividend Share Credits under any ARCO Stock
     Plan, including Prospective Dividend Share Credits to be credited pursuant
     to Article IV, Subsection 4(b) of the ELTIP and under Article II, Section
     2.6 of the Director's Plan (as defined in Section 1.5.6(b)) in connection
     with the Merger, BP Amoco and ARCO agree that: (a) as of the Effective
     Time, ARCO Common Shares represented by Dividend Share Credits, including
     such Prospective Dividend Share Credits, shall be deemed converted into BP
     Amoco Ordinary Shares at the Exchange Ratio; (b) after the Effective Time
     the obligation of ARCO to deliver ARCO Common Shares under Article IV,
     Section 3 of the ELTIP shall be satisfied through the delivery by BP Amoco
     of  (i) a number of BP Amoco Ordinary Shares (to be issued in the form of
     BP Amoco Depositary Shares) equal to the number of ARCO Common Shares that
     were otherwise so deliverable multiplied by the Exchange Ratio and rounded
     down to the number of BP Amoco Ordinary Shares representing the nearest
     whole number of BP Amoco Depositary Shares issuable in respect of such ARCO
     Common Shares and (ii) cash in lieu of any fractional interest in a BP
     Amoco Depositary Share, which would otherwise be issuable in respect of
     such ARCO Common Shares; and (c) after the Effective Time, references in
     Article IV of the ELTIP and Article V of the Directors' Plan to "Common
     Stock" shall be deemed references to "BP Amoco Ordinary Shares", and
     references in Article I, Subsection 2(m) of the ELTIP and Article II,
     Subsection 2.7 of the Directors' Plan to "New York Stock Exchange" shall be
     to "London Stock Exchange".

          I.5.5.  At the Effective Time, each right of any kind, whether vested
     or unvested, contingent or accrued, to acquire or receive ARCO Common
     Shares that may be held, awarded, outstanding, credited, payable or
     reserved for issuance under the ARCO Stock Plans and any other ARCO
     Compensation and Benefit Plan (as defined in 2.1.12), except for ARCO Stock
     Options converted in accordance with Section 1.5.1, shares of Restricted
     Stock and Performance-Based Restricted Stock converted in accordance with
     Section 1.5.2, Contingent

                                      -11-
<PAGE>

     Restricted Stock converted in accordance with Section 1.5.3, and any
     Dividend Share Credits converted in accordance with 1.5.4, shall be deemed
     to be converted into a right to acquire or receive, as the case may be, (i)
     the number of BP Amoco Ordinary Shares (to be issued in the form of BP
     Amoco Depositary Shares) equal to the number of ARCO Common Shares subject
     to such right immediately prior to the Effective Time multiplied by the
     Exchange Ratio and rounded down to the number of BP Amoco Ordinary Shares
     representing the nearest whole number of BP Amoco Depositary Shares
     issuable in respect of such ARCO Common Shares and (ii) cash in lieu of any
     fractional interest in a BP Amoco Depositary Share which would otherwise be
     issuable in respect of such ARCO Common Shares; and such rights with
     respect to BP Amoco Ordinary Shares shall otherwise be subject to the same
     terms, conditions and restrictions, if any, as were applicable to the
     rights with respect to ARCO Common Shares under the relevant ARCO Stock
     Plan or ARCO Compensation and Benefit Plan. Similarly, all ARCO Stock Plans
     and other ARCO Compensation and Benefit Plans (and awards thereunder)
     providing for cash payments measured by the value of a number of ARCO
     Common Shares shall be deemed to refer to the number of BP Amoco Ordinary
     Shares equal to the result of multiplying such number of ARCO Common Shares
     by the Exchange Ratio, and such cash payments shall otherwise be made on
     the same terms, conditions and restrictions, if any, as were applicable
     under the relevant ARCO Stock Plan or ARCO Compensation and Benefit Plan.
     At or prior to the Effective Time, ARCO shall adopt appropriate amendments
     to the ARCO Stock Plans and the ARCO Compensation and Benefit Plans to
     effectuate the provisions of this Section 1.5.5. Without limiting the
     applicability of the foregoing, ARCO shall take all necessary action to
     ensure that the Surviving Corporation will not be bound at the Effective
     Time by any options, stock appreciation rights, warrants or other rights or
     arrangements under any ARCO Compensation and Benefit Plan that would
     entitle any person to own any ARCO Common Shares or to receive any payments
     in respect thereof, and all ARCO Compensation and Benefit Plans conferring
     any rights to ARCO Common Shares or other capital stock of ARCO shall be
     deemed to be amended to be in conformity with this Section.

          I.5.6.  All capitalized terms used in this Section 1.5 and not
     otherwise defined in this Agreement shall have the respective meanings
     given such terms in the ELTIP.  "Directors' Plan" means the Stock Option
                                      ---------------
     Plan for Outside Directors of ARCO, as amended through the date hereof.

          I.5.7.  Prior to the Effective Time, BP Amoco shall make available for
     issuance in accordance with Section 1.4.1 the number of BP Amoco Ordinary
     Shares necessary to satisfy BP Amoco's obligations under this Section 1.5.
     At the

                                      -12-
<PAGE>

     Effective Time, BP Amoco shall file with the Securities and Exchange
     Commission (the "SEC") a registration statement on an appropriate form or a
                      ---
     post-effective amendment to a previously filed registration statement under
     the Securities Act of 1933, as amended (the "Securities Act"), (i) with
                                                  --------------
     respect to the BP Amoco Ordinary Shares and the BP Amoco Depositary Shares
     subject to issuance or subject to options pursuant to this Section 1.5, and
     (ii) if registration of any other interests in any ARCO Stock Plan or any
     other ARCO Compensation and Benefit Plan referred to in this Section 1.5,
     or the BP Amoco Ordinary Shares and BP Amoco Depositary Shares to be issued
     thereunder, is required under the Securities Act, with respect to such
     interests or such BP Amoco Ordinary Shares or BP Amoco Depositary Shares,
     BP Amoco shall use its best reasonable efforts to cause such registration
     statement to become and remain effective and maintain the current status of
     the prospectus contained therein, as well as comply with any applicable
     state securities or "blue sky" laws, for so long as such options remain
     outstanding.

          I.5.8. BP Amoco shall, following the Closing, pay all stamp duties,
     stamp duty reserve tax and other taxes and similar levies imposed in
     connection with the issuance or creation of the BP Amoco Depositary Shares
     and any BP Amoco ADRs in connection with such issuance or creation,
     pursuant to this Section 1.5.

          I.6.   Fractional BP Amoco Depositary Shares.  No fraction of a BP
                 -------------------------------------
Amoco Depositary Share will be issued.  In lieu of any fractional interest in a
BP Amoco Depositary Share, including any Excess Ordinary Shares representing
such a fractional interest, each holder of ARCO Common Shares who would
otherwise be entitled thereto shall be entitled to an amount in cash, without
interest, rounded to the nearest cent, equal to the product of (i) the amount of
the fractional interest in a BP Amoco Depositary Share to which such holder is
entitled under Section 1.3 (or would be entitled but for this Section 1.6) and
(ii) the average of the closing sale prices for the BP Amoco Depositary Shares
on the New York Stock Exchange (the "NYSE"), as reported in The Wall Street
                                     ----                   ---------------
Journal, Northeastern edition, for each of the ten consecutive trading days
- -------
ending with the fifth complete trading day prior to the Closing Date (not
counting the Closing Date).

          I.7.   The Surviving Corporation.
                 -------------------------

          I.7.1. The certificate of incorporation of the Surviving Corporation
     shall be the restated certificate of incorporation of ARCO, unless this
     Agreement is adopted by the holders of 66 2/3% or more of the voting power
     of the outstanding stock entitled to vote at the ARCO Stockholders Meeting
     (as defined in Section 3.4), in which case the restated certificate of
     incorporation of the Surviving

                                      -13-
<PAGE>

     Corporation shall be amended as of the Effective Time to delete Articles V,
     VI, VII and VIII and to substitute therefor Articles V, VI and VII as set
     forth in full in Exhibit A.
                      ---------

          I.7.2.  The bylaws of Merger Sub in effect at the Effective Time shall
     be the bylaws of the Surviving Corporation until amended in accordance with
     applicable law.

          I.7.3.  From and after the Effective Time, until successors are duly
     elected or appointed and qualified in accordance with applicable law, (i)
     the directors of Merger Sub at the Effective Time shall be the directors of
     the Surviving Corporation, and (ii) such officers as are mutually agreed by
     BP Amoco and ARCO prior to the Effective Time shall be the officers of the
     Surviving Corporation.

          1.8.  Lost, Stolen or Destroyed Certificates.  In the event any
                --------------------------------------
Certificate shall have been lost, stolen or destroyed, upon the holder's
compliance with the replacement requirements established by the Exchange Agent,
including, if necessary, the posting by such Person of a bond in customary
amount as indemnity against any claim that may be made against it with respect
to such Certificate, the Exchange Agent will issue in exchange for such lost,
stolen or destroyed Certificate, the Merger Consideration and any cash payable
in lieu of fractional interests in BP Amoco Depositary Shares and any unpaid
dividends or other distributions deliverable pursuant to Section 1.4.6 in
respect of the ARCO Common Shares represented by such Certificate pursuant to
this Agreement.


                                  ARTICLE II

                        Representations and Warranties

          II.1.  Representations and Warranties of BP Amoco and ARCO.  Except
                 ---------------------------------------------------
as set forth in the corresponding sections or subsections of the disclosure
letter, dated the date hereof and signed by an authorized officer, delivered by
BP Amoco to ARCO or by ARCO to BP Amoco (each a "Disclosure Letter," and the "BP
                                                 -----------------            --
Amoco Disclosure Letter" and the "ARCO Disclosure Letter," respectively), as the
- -----------------------           ----------------------
case may be, BP Amoco (except for Sections 2.1.2.2, 2.1.3.2, 2.1.5.2, 2.1.8,
2.1.9(ii), 2.1.10.2, 2.1.12, 2.1.14 and 2.1.15 and references in Section 2.1.1
to documents made available by ARCO to BP Amoco) hereby represents and warrants
to ARCO, and ARCO (except for Sections 2.1.2.1, 2.1.3.1, 2.1.5.1, 2.1.9(i),
2.1.10.1 and 2.1.11 and references in Section 2.1.1 to documents made available
by BP Amoco to ARCO), subject to Section 2.2, hereby represents and warrants to
BP Amoco, that:

                                      -14-
<PAGE>

          II.1.1.  Organization, Good Standing and Qualification.  Each of it
                   ---------------------------------------------
     and its Subsidiaries (as defined below), is duly organized, validly
     existing and in good standing (with respect to jurisdictions that recognize
     the concept of good standing) under the laws of its respective jurisdiction
     of organization and has all requisite corporate or similar power and
     authority, and has been duly authorized by all necessary approvals and
     orders, to own, operate and lease its properties and assets and to carry on
     its business as presently conducted and is duly qualified to do business
     and is in good standing in each jurisdiction where the ownership, operation
     or leasing of its assets or properties or conduct of its business requires
     such qualification, except where the failure to be so organized, qualified
     or in good standing, or to have such power or authority, would not,
     individually or in the aggregate, reasonably be expected to have a Material
     Adverse Effect (as defined below) on it.  BP Amoco has made available to
     ARCO complete and correct copies of its memorandum and articles of
     association, and ARCO has made available to BP Amoco complete and correct
     copies of its restated certificate of incorporation and by-laws, in all
     cases as amended to date.  Such memorandum and articles of association or
     restated certificate of incorporation and by-laws, as the case may be, as
     so made available are in full force and effect.

          As used in this Agreement, the term (i) "Subsidiary" means, with
                                                   ----------
     respect to BP Amoco, any body corporate which is a subsidiary or subsidiary
     undertaking, in each case within the meaning of the Companies Act of 1985
     of the United Kingdom, as amended (the "Companies Act"),  and, with respect
                                             -------------
     to ARCO, any entity, whether incorporated or unincorporated, in which ARCO
     owns, directly or indirectly, more than fifty percent of the securities or
     other ownership interests having by their terms ordinary voting power to
     elect more than fifty percent of the directors or other persons performing
     similar functions, or the management and policies of which ARCO otherwise
     has the power to direct, (ii) "Material Adverse Effect" means, with respect
                                    -----------------------
     to any Person (as defined below), a material adverse effect on the
     financial condition, properties, business or operating income of such
     Person and its Subsidiaries taken as a whole, other than any such effect to
     the extent arising out of changes in general United States, United Kingdom
     or international economic conditions, conditions or changes in or affecting
     the United States, United Kingdom or international oil and gas industry
     (including changes in market prices), provided that, except as otherwise
                                           --------
     specifically provided, all references to Material Adverse Effect on BP
     Amoco or any of its Subsidiaries or to ARCO or any of its Subsidiaries in
     this Article II or in Article III shall be deemed to refer solely to BP
     Amoco and its Subsidiaries and ARCO and its Subsidiaries, respectively,
     without giving effect to BP Amoco's ownership of ARCO and its Subsidiaries
     after the Effective Time,  (iii) "Person"
                                       ------

                                      -15-
<PAGE>

     shall mean any individual, corporation (including not-for-profit), general
     or limited partnership, limited liability or unlimited liability company,
     joint venture, estate, trust, association, organization, Governmental
     Entity (as defined in Section 2.1.4.1) or other entity of any kind or
     nature, and (iv) "Affiliate" shall have the meaning specified in Rule 12b-2
                       ---------
     of the Securities Exchange Act of 1934, as amended (the "Exchange Act").
                                                              ------------

          II.1.2.  Capital Structure.
                   -----------------

                                      -16-
<PAGE>

               II.1.2.1.  The authorized share capital of BP Amoco is
          $6,000,000,000 and (Pounds)12,750,000.  As of the close of business on
          March 29, 1999, the allotted share capital of BP Amoco consisted of
          9,720,380,579 BP Amoco Ordinary Shares, not more than 7,232,838 8%
          cumulative first preference shares, of nominal value (Pounds)1 each
          ("BP Amoco First Preference Shares"), and not more than 5,473,414 9%
          ----------------------------------
          cumulative second preference shares, of nominal value (Pounds)1 each
          ("BP Amoco Second Preference Shares").  All of the outstanding BP
            ---------------------------------
          Amoco Ordinary Shares, BP Amoco First Preference Shares and BP Amoco
          Second Preference Shares have been, and the BP Amoco Ordinary Shares
          to be issued as Merger Consideration shall be, duly authorized and
          validly issued and are or will be, as the case may be, fully paid or
          credited as fully paid.  As of March 31, 1999, BP Amoco has no BP
          Amoco Ordinary Shares, BP Amoco First Preference Shares or BP Amoco
          Second Preference Shares reserved for or otherwise subject to
          issuance, except for BP Amoco Ordinary Shares held by trusts or
          otherwise subject to issuance in relation to option schemes pursuant
          to which BP Amoco Ordinary Shares may be issued in the ordinary course
          of business (the "Option Schemes").  Each of the outstanding shares of
                            --------------
          capital stock or other ownership interests of each of BP Amoco's
          Subsidiaries that constitutes a "Significant Subsidiary" (as defined
          in Rule 1-02(w) of Regulation S-X promulgated under the Exchange Act)
          is duly authorized, validly issued, fully paid and nonassessable and
          owned by BP Amoco or a direct or indirect wholly owned Subsidiary of
          BP Amoco, in each case free and clear of any lien, pledge, security
          interest, claim or other encumbrance ("Encumbrance").  Except as set
                                                 -----------
          forth above or as contemplated by this Agreement, there are no pre-
          emptive or other outstanding rights, options, warrants, conversion
          rights, stock appreciation rights, redemption rights, repurchase
          rights, agreements, arrangements, calls, commitments or rights of any
          kind which obligate BP Amoco or any of its Subsidiaries to issue or to
          sell any shares of capital stock or other securities of BP Amoco or
          any of its Subsidiaries or any securities or obligations convertible
          or exchangeable into or exercisable for, or giving any Person a right
          to subscribe for or acquire from BP Amoco or any of its Subsidiaries,
          any securities of BP Amoco or any of its Subsidiaries, and no
          securities or obligations evidencing such rights are authorized,
          issued or outstanding.  BP Amoco does not have outstanding any bonds,
          debentures, notes or other obligations the holders of which have the
          right to vote (or which are convertible into or exercisable for
          securities having the right to vote) with the shareholders of BP Amoco
          on any matter.

                                      -17-
<PAGE>

               II.1.2.2. The authorized capital stock of ARCO consists of
          600,000,000 ARCO Common Shares, of which 325,937,777 ARCO Common
          Shares were issued and outstanding as of the close of business on
          March 26, 1999, 75,000,000 shares of Preferred Stock, par value $.01
          per share ("ARCO Preferred Stock"), of which no shares were
                      --------------------
          outstanding as of the date hereof; 78,089 shares of $3.00 Cumulative
          Convertible Preference Stock, par value $1.00 per share ("ARCO $3.00
                                                                    ----------
          Preference Stock"), of which 49,749 shares were outstanding as of
          ----------------
          March 26, 1999; and 833,776 shares of $2.80 Cumulative Convertible
          Preference Stock, par value $1.00 per share ("ARCO $2.80 Preference
                                                        ---------------------
          Stock"), of which 564,439 shares were outstanding as of March 26, 1999
          -----
          (the ARCO $3.00 Preference Stock and the ARCO $2.80 Preference Stock
          being referred to herein as the "ARCO Preference Stock").  All of the
                                           ---------------------
          outstanding ARCO Common Shares and shares of ARCO Preference Stock
          have been duly authorized and validly issued and are fully paid and
          nonassessable.  As of March 31, 1999, ARCO has no ARCO Common Shares,
          shares of ARCO Preferred Stock or shares of ARCO Preference Stock
          reserved for or otherwise subject to issuance, except that (i) as of
          the close of business on March 29, 1999, there were 13,927,493.16 ARCO
          Common Shares subject to issuance pursuant to options or other common
          stock equivalents (excluding Prospective Dividend Share Credits (as
          defined in the ELTIP)) outstanding under the plans of ARCO identified
          in paragraph 2.1.2.2 of the ARCO Disclosure Letter as being the only
          ARCO Compensation and Benefit Plans pursuant to which ARCO Common
          Shares may be issued (the "ARCO Stock Plans"); and (ii) as of the date
                                     ----------------
          hereof, there are not less than 64,861,617 ARCO Common Shares reserved
          for issuance pursuant to the Stock Option Agreement.  Each of the
          outstanding shares of capital stock or other ownership interests of
          each of ARCO's Significant Subsidiaries (or, in the case of Vastar
          Resources, Inc. ("Vastar"), the shares of capital stock of Vastar
                            ------
          owned by ARCO) is duly authorized, validly issued, fully paid and
          nonassessable and owned by ARCO or a direct or indirect wholly owned
          subsidiary of ARCO, in each case free and clear of any Encumbrance.
          Except as set forth above or as contemplated by this Agreement, there
          are no preemptive or other outstanding rights, options, warrants,
          conversion rights, stock appreciation rights, redemption rights,
          repurchase rights, agreements, arrangements, calls, commitments or
          rights of any kind which obligate ARCO or any of its Subsidiaries to
          issue or sell any shares of capital stock or other securities of ARCO
          or any of its Subsidiaries or any securities or obligations
          convertible or exchangeable into or exercisable for, or giving any
          Person a right to subscribe for or acquire from ARCO or any of its
          Subsidiaries, any securities of ARCO or

                                      -18-
<PAGE>

          any of its Subsidiaries, and no securities or obligations evidencing
          such rights are authorized, issued or outstanding. The ARCO Common
          Shares issuable pursuant to the Stock Option Agreement have been duly
          reserved for issuance by ARCO, and upon any issuance of such ARCO
          Common Shares in accordance with the terms of the Stock Option
          Agreement, such ARCO Common Shares will be duly authorized, validly
          issued, fully paid and nonassessable and free and clear of any
          Encumbrance. ARCO does not have outstanding any bonds, debentures,
          notes or other obligations the holders of which have the right to vote
          (or which are convertible into or exercisable for securities having
          the right to vote) with the stockholders of ARCO on any matter.

          II.1.3.  Corporate Authority; Approval and Fairness.
                   ------------------------------------------

               II.1.3.1.  BP Amoco 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
          the Stock Option Agreement and to consummate the Merger and the other
          transactions contemplated hereby and thereby, subject only to the
          approval of the Merger by, on a show of hands, not less than the
          requisite majority of the holders of outstanding BP Amoco Ordinary
          Shares, BP Amoco First Preference Shares and BP Amoco Second
          Preference Shares (collectively, the "BP Amoco Voting Shares") present
                                                ----------------------
          in person or, on a poll, not less than the requisite majority of the
          votes attaching to the BP Amoco Voting Shares voted by the holders in
          person or by proxy at the BP Amoco Shareholders Meeting (as defined in
          Section 3.4) (the "BP Amoco Requisite Vote").  The execution, delivery
                             -----------------------
          and performance of this Agreement and the Stock Option Agreement have
          been duly authorized by all necessary corporate action on the part of
          BP Amoco, and, assuming the due authorization, execution and delivery
          of this Agreement and the Stock Option Agreement by ARCO, this
          Agreement and the Stock Option Agreement constitute valid and binding
          agreements of BP Amoco, enforceable against BP Amoco in accordance
          with their terms, subject to  bankruptcy, insolvency, fraudulent
          transfer, reorganization, moratorium and similar laws of general
          applicability relating to or affecting creditors' rights and to
          general equity principles (the "Bankruptcy and Equity Exception").
                                          -------------------------------
          The Board of Directors of BP Amoco has approved this Agreement, the
          Stock Option Agreement, the Merger and the other transactions
          contemplated hereby and thereby and the Board of Directors has
          received the opinion of its financial advisor, Morgan Stanley & Co.

                                      -19-
<PAGE>

          Incorporated, to the effect that, as of the date of this Agreement,
          the Exchange Ratio is fair to BP Amoco, from a financial point of
          view.

               II.1.3.2.  ARCO 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 the Stock
          Option Agreement and to consummate the Merger and the other
          transactions contemplated hereby and thereby, subject only to the
          adoption of this Agreement by the vote of the holders of a majority of
          the outstanding stock entitled to vote at the ARCO Stockholders
          Meeting (the "ARCO Requisite Vote").  The execution, delivery and
                        -------------------
          performance of this Agreement and the Stock Option Agreement have been
          duly authorized by all necessary corporate action on the part of ARCO
          and, assuming the due authorization, execution and delivery of this
          Agreement and the Stock Option Agreement by BP Amoco, this Agreement
          and the Stock Option Agreement constitute valid and binding agreements
          of ARCO enforceable against ARCO in accordance with their terms,
          subject to the Bankruptcy and Equity Exception. The Board of Directors
          of ARCO (A) has unanimously approved this Agreement, the Stock Option
          Agreement, the  Merger and the other transactions contemplated hereby
          and thereby and declared the advisability of the Merger Agreement and
          (B) has received the opinions of its financial advisors, Goldman,
          Sachs & Co. and Salomon Smith Barney Inc., to the effect that, as of
          the date of this Agreement, the Exchange Ratio is fair to the holders
          of ARCO Common Shares (other than holders of Excluded ARCO Shares)
          from a financial point of view.

          II.1.4.  Governmental Filings; No Violations.
                   -----------------------------------

                                      -20-
<PAGE>

               II.1.4.1.  Other than the necessary filings, permits,
          authorizations, notices, approvals, confirmations, consents,
          declarations and/or decisions (A) pursuant to Sections 1.2.2 and
          3.3.1, (B) under the Hart-Scott-Rodino Antitrust Improvements Act of
          1976, as amended (the "HSR Act"), the Exchange Act, the Securities Act
                                 -------
          and the Exon-Florio provisions of the Omnibus Trade and
          Competitiveness Act of 1988 ("Exon-Florio"), (C) to comply with the
                                        -----------
          rules and regulations of the NYSE or the LSE or any other stock
          exchanges on which securities of BP Amoco, ARCO or any of their
          respective Subsidiaries are listed, (D) to comply with Council
          Regulation (EEC) No 4064/89 as amended (the "Regulation"), (insofar as
                                                       ----------
          the Merger constitutes a concentration with a Community dimension
          within the scope of the Regulation), (E) from the UK Office of Fair
          Trading that is not the intention of the UK Secretary of State for
          Trade and Industry to refer the Merger or any matters arising
          therefrom to the UK Monopolies and Mergers Commission (the "MMC") or
                                                                      ---
          from the Secretary of State for Trade and Industry in the event that
          the Merger or any matters arising therefrom are referred to the MMC
          (insofar as the Merger qualifies for investigation by the MMC under
          the UK Fair Trading Act 1973 or a referral is made by the European
          Commission to the UK Competent Authority under Article 9 of the
          Regulation), (F) with or from any other national authority within the
          European Community to which the Merger (or any part of it) is referred
          pursuant to Article 9 of the Regulation) and (G) from H.M. Treasury
          pursuant to section 765 of the Income and Corporation Taxes Act 1988
          (or the confirmation from H.M. Treasury or the Inland Revenue that no
          such consent is required to the transactions contemplated by this
          Agreement) (such filings, permits, authorizations, notices, approvals,
          confirmations, consents, declarations and/or decisions to be made,
          given or obtained by BP Amoco being the "BP Amoco Required Consents"
                                                   --------------------------
          and by ARCO being the "ARCO Required Consents"), no filings, notices,
                                 ----------------------
          declarations and/or decisions are required to be made by it with, nor
          are any permits, authorizations, approvals or other confirmations or
          consents required to be obtained by it from, any governmental or
          regulatory (including stock exchange) authority, agency, court,
          commission, body or other governmental entity (including the U.K.
          Panel on Takeovers and Mergers (the "Takeover Panel")) (each, a
                                               --------------
          "Governmental Entity"), in connection with the execution and delivery
          --------------------
          by it of this Agreement and the Stock Option Agreement and the
          consummation by it of the Merger and the other transactions
          contemplated hereby and thereby, except those the failure of which to
          make, give or obtain would not, individually or in the aggregate,
          reasonably be expected to have a Material Adverse Effect on it or
          prevent, materially delay or

                                      -21-
<PAGE>

          materially impair its ability to consummate the Merger and the other
          transactions contemplated by this Agreement and the Stock Option
          Agreement.

               II.1.4.2.  The execution, delivery and performance of this
          Agreement and the Stock Option Agreement by it do not, and the
          consummation by it of the Merger and the other transactions
          contemplated hereby and thereby (including, in the case of BP Amoco,
          the issue of BP Amoco Ordinary Shares, and the deposit of BP Amoco
          Ordinary Shares by or on behalf of BP Amoco with the Depositary
          against issuance of BP Amoco Depositary Shares in accordance with the
          Deposit Agreement) will not, constitute or result in (A) a breach or
          violation of, or a default under, its memorandum or articles of
          association, in the case of BP Amoco, or its restated certificate of
          incorporation or by-laws, in the case of ARCO, or the comparable
          governing instruments of any of the Significant Subsidiaries of BP
          Amoco or ARCO (in each case as amended from time to time), (B) subject
          to making, giving or obtaining all necessary filings, permits,
          authorizations, notices, approvals, confirmations, consents,
          declarations and/or decisions described in Section 2.1.4.1 and all
          other necessary third-party consents as set forth in paragraph 2.1.4.2
          of its Disclosure Letter, a breach or violation of, or a default
          under, the acceleration of any obligations or rights of third parties
          or the creation of an Encumbrance on the assets of it or any of its
          Subsidiaries (with or without notice, lapse of time or both) pursuant
          to any agreement, lease, license, contract, note, mortgage, indenture,
          arrangement or other obligation ("Contracts") binding upon it or any
                                            ---------
          of its Subsidiaries or any law, ordinance, regulation, judgment,
          order, decree, arbitration, award, license or permit of any
          Governmental Entity ("Law") or non-governmental permit or license to
                                ---
          which it or any of its Subsidiaries is subject, or (C) any change in
          the rights or obligations of either Party under any of its Contracts,
          except, in the case of clause (B) or (C) above, for any breach,
          violation, default, acceleration, creation or change that,
          individually or in the aggregate, would not reasonably be expected to
          have a Material Adverse Effect on it or prevent, materially delay or
          materially impair its ability to consummate the Merger and the other
          transactions contemplated by this Agreement and the Stock Option
          Agreement.

          II.1.5.  Reports; Financial Statements.
                   -----------------------------

                                      -22-
<PAGE>

               II.1.5.1.  BP Amoco has made available to ARCO copies of (A) each
          registration statement, report and annual report prepared by it or its
          Subsidiaries and filed with the SEC since December 31, 1997, each in
          the form (including exhibits, annexes and any amendments thereto)
          filed with the SEC, a draft as of the date hereof of BP Amoco's Annual
          Report on Form 20-F for the year ended December 31, 1998 (the "BP
                                                                         --
          Amoco 20-F," December 31, 1998 being the "BP Amoco Audit Date"), and
          ----------                                -------------------
          each quarterly report distributed by BP Amoco to its shareholders
          (collectively, including any such registration statement, report or
          annual report filed with the SEC or, in the case of quarterly reports,
          distributed to BP Amoco shareholders subsequent to the date hereof,
          the "BP Amoco Reports"); and (B) all circulars, reports and other
               ----------------
          documents distributed by BP Amoco to its shareholders since the BP
          Amoco Audit Date.  As of their respective dates, the BP Amoco Reports
          (i) complied in all material respects with, and any BP Amoco Report
          filed, distributed or delivered subsequent to the date hereof will
          comply in all material respects with, any applicable requirements of
          the Securities Act and the Exchange Act and the rules and regulations
          of the SEC promulgated thereunder and (ii) did not, and any BP Amoco
          Report filed, distributed or delivered subsequent to the date hereof
          will not (and all circulars, reports and other documents referred to
          in clause (B) of the preceding sentence did not, and such materials
          circulated subsequent to the date hereof will not), contain any untrue
          statement of a material fact or omit to state a material fact required
          to be stated therein or necessary to make the statements made therein,
          in the light of the circumstances under which they were made, not
          misleading.  Each of the audited consolidated balance sheets of BP
          Amoco and its Subsidiaries included in or incorporated by reference
          into the BP Amoco Reports (including the related notes and schedules)
          fairly presents, or will fairly present, in all material respects, the
          consolidated financial position of BP Amoco and its Subsidiaries as of
          its date, and each of the related consolidated statements of income,
          changes in shareholders' interest, total recognized gains and losses
          and cash flows included in or incorporated by reference into the BP
          Amoco Reports (including any related notes and schedules) fairly
          presents, or will fairly present, in all material respects, the
          consolidated results of its operations, retained earnings and cash
          flows of BP Amoco and its Subsidiaries as of the relevant dates for
          the periods set forth therein (subject, in the case of unaudited
          statements, to notes and normal year-end audit adjustments that will
          not be material in amount or effect), in each case in accordance with
          generally accepted accounting principles in the U.K. ("U.K. GAAP")
                                                                 ---------
          consistently applied during the periods involved except as may be
          noted therein.  The related notes

                                      -23-
<PAGE>

          reconciling to generally accepted accounting principles in the United
          States ("U.S. GAAP") the consolidated net income and shareholders'
                   ---------
          equity of BP Amoco and its Subsidiaries comply in all material
          respects with the requirements of the SEC applicable to such
          reconciliation.

               II.1.5.2.  ARCO has made available to BP Amoco copies of each
          registration statement, report, proxy statement or information
          statement prepared by it or any of its Subsidiaries and filed with the
          SEC since December 31, 1998 (December 31, 1998 being the "ARCO Audit
                                                                    ----------
          Date," with the BP Amoco Audit Date and the ARCO Audit Date each being
          ----
          referred to herein as the relevant Party's "Audit Date"), including
                                                      ----------
          ARCO's Annual Report on Form 10-K for the year ended December 31,
          1998, each in the form (including exhibits, annexes and any amendments
          thereto) filed with the SEC (collectively, including any such
          registration statement, report, proxy statement or information
          statement filed with the SEC subsequent to the date hereof, the "ARCO
                                                                           ----
          Reports").  As of their respective dates, the ARCO Reports (i)
          -------
          complied in all material respects with, and any ARCO Report filed
          subsequent to the date hereof will comply in all material respects
          with, any applicable requirements of the Securities Act and the
          Exchange Act and the rules and regulations of the SEC promulgated
          thereunder and (ii) did not, and any ARCO Reports filed with the SEC
          subsequent to the date hereof will not, contain any untrue statement
          of a material fact or omit to state a material fact required to be
          stated therein or necessary to make the statements made therein, in
          the light of the circumstances under which they were made, not
          misleading.  Each of the consolidated balance sheets included in or
          incorporated by reference into the ARCO Reports (including the related
          notes and schedules) fairly presents, or will fairly present, in all
          material respects, the consolidated financial position of ARCO and its
          Subsidiaries as of its date and each of the related consolidated
          statements of income, changes in stockholders' equity and cash flows
          included in or incorporated by reference into the ARCO Reports
          (including any related notes and schedules) fairly presents, or will
          fairly present in all material respects, the consolidated results of
          operations and cash flows of ARCO and its Subsidiaries for the periods
          set forth therein (subject, in the case of unaudited statements, to
          notes and normal year-end audit adjustments that will not be material
          in amount or effect), in each case in accordance with U.S. GAAP
          consistently applied during the periods involved except as may be
          noted therein.  The BP Amoco Reports and the ARCO Reports are
          collectively referred to herein as the "Reports," and references in
                                                  -------
          this Agreement to "Reports filed prior to the date hereof" shall
          include, with

                                      -24-
<PAGE>

          respect to BP Amoco, the BP Amoco 20-F provided to ARCO on or prior to
          the date hereof.

          II.1.6.  Absence of Certain Changes.  Except as disclosed in the
                   --------------------------
     Reports filed prior to the date hereof, or as expressly contemplated by
     this Agreement, since its respective Audit Date it and its Subsidiaries
     have conducted their respective businesses only in, and have not engaged in
     any material transaction other than according to, the ordinary and usual
     course of such businesses, and there has not been (i) any change in the
     financial condition, properties, business or operating income of it and its
     Subsidiaries except those changes that, individually or in the aggregate,
     have not had and would not reasonably be expected to have a Material
     Adverse Effect on it; (ii) any declaration, setting aside or payment of any
     dividend or other distribution in cash, stock or property in respect of its
     capital stock, except for dividends or other distributions on its capital
     stock publicly announced prior to the date hereof and except as expressly
     permitted hereby; (iii) any stock split, stock combination,
     recapitalization, redenomination of share capital or other similar
     transaction or issuance or authorization of any issuance of any other
     securities in respect of, in lieu of or in substitution for shares of its
     capital stock, except as expressly contemplated hereby or, in the case of
     ARCO, in the Stock Option Agreement; or (iv) any change by it in accounting
     principles, practices or methods except as required by changes in U.K. GAAP
     or U.S. GAAP, as the case may be.  Since its respective Audit Date, except
     as provided for herein or as disclosed in the Reports filed prior to the
     date hereof, there has not been any material increase in the compensation
     payable or that could become payable by it or any of its Subsidiaries to
     officers or key employees or any amendment of any of its compensation or
     benefit plans or agreements other than increases or amendments in the
     ordinary course or as contemplated by this Agreement.

          II.1.7.  Litigation and Liabilities.  Except as disclosed in the
                   --------------------------
     Reports filed prior to the date hereof, there are no (i) civil, criminal or
     administrative actions, suits, claims, hearings, investigations, complaints
     or proceedings pending or, to the knowledge of, in the case of BP Amoco,
     its Chief Executive Officer, Deputy Chief Executive Officer, Chief
     Financial Officer or General Counsel ("BP Amoco Executive Directors"), and,
                                            ----------------------------
     in the case of ARCO, its Chief Executive Officer, President, Chief
     Financial Officer or General Counsel ("ARCO Executive Officers"),
                                            -----------------------
     threatened against it or any of its Affiliates or (ii) obligations or
     liabilities, whether or not accrued, contingent or otherwise and whether or
     not required to be disclosed, or any other facts or circumstances of which,
     in the case of BP Amoco, the BP Amoco Executive Directors, and, in the case
     of ARCO, the ARCO Executive Officers, have knowledge that would reasonably
     be expected to result in any claims against, or obligations or liabilities
     of, it or any of its

                                      -25-
<PAGE>

     Subsidiaries, except, in each case, for those that, individually or in the
     aggregate, have not had and would not reasonably be expected to have a
     Material Adverse Effect on it or prevent, materially delay or materially
     impair its ability to consummate the Merger and the other transactions
     contemplated by this Agreement and the Stock Option Agreement.

          II.1.8.  Takeover Statutes.  Assuming that BP Amoco's representation
                   -----------------
     and warranty set forth in Section 2.1.10.1 is true and correct, the board
     of directors of ARCO has taken or will take all appropriate and necessary
     action such that BP Amoco will not be prohibited from entering in a
     "business combination" with ARCO as an "interested stockholder" (in each
     case as such term is used in Section 203 of the DGCL) without complying
     with Section 203(a)(3) of the DGCL as a result of the execution and
     delivery of this Agreement and the Stock Option Agreement or the
     consummation of the transactions contemplated hereby and thereby.  No other
     "fair price," "moratorium," "control share acquisition" or other similar
     anti-takeover statute or regulation, including such business combination
     provisions of the DGCL (each, a "Takeover Statute"), and no anti-takeover
                                      ----------------
     provision in the restated certificate of incorporation or by-laws of ARCO
     is, or at the Effective Time will be, applicable to the Merger or any of
     the other transactions contemplated by this Agreement and the Stock Option
     Agreement.

          II.1.9.  Brokers and Finders.  Neither it nor any of its Subsidiaries,
                   -------------------
     officers, directors or employees has employed any broker or finder or
     incurred any liability for any brokerage fees, commissions or finders' fees
     in connection with the execution and delivery of this Agreement, the Stock
     Option Agreement, the Merger or the other transactions contemplated by this
     Agreement and the Stock Option Agreement, except that (i) BP Amoco has
     employed Morgan Stanley & Co. Incorporated, Merrill Lynch, Pierce, Fenner &
     Smith Incorporated and Cazenove & Co. as its financial advisors, the
     arrangements with all of which have been disclosed to ARCO prior to the
     date hereof, and (ii) ARCO has retained Goldman, Sachs & Co. and Salomon
     Smith Barney Inc. as its financial advisors, the arrangements with both of
     which have been disclosed to BP Amoco prior to the date hereof.

          II.1.10.  Ownership of Other Party's Common Stock.
                    ---------------------------------------

               II.1.10.1.  Neither BP Amoco nor any of its Subsidiaries
          "beneficially owns" (as such term is defined in Rule 13d-3 under the
          Exchange Act) any ARCO Common Shares.

                                      -26-
<PAGE>

               II.1.10.2.  Neither ARCO nor any of its Subsidiaries
          "beneficially owns" (as such term is defined in Rule 13d-3 under the
          Exchange Act) any BP Amoco Ordinary Shares or BP Amoco Depositary
          Shares (other than any BP Amoco Ordinary Shares or BP Amoco Depositary
          Shares beneficially owned by an ARCO Compensation and Benefit Plan or
          an ARCO sponsored non-U.S. employee benefit plan and, if the DSC II
          Share Exchange is consummated prior to the Effective Time, by DSC II).

          II.1.11.  Merger Sub.  Merger Sub was formed solely for the purpose of
                    ----------
     engaging in the transactions contemplated hereby and has not (i) engaged in
     any business activities, (ii) conducted any operations other than in
     connection with the transactions contemplated hereby or (iii) incurred any
     liabilities other than in connection with the transactions contemplated
     hereby.  The execution, delivery and performance of this Agreement have
     been duly authorized by all necessary corporate action on the part of
     Merger Sub and, assuming the due authorization, execution and delivery of
     this Agreement by ARCO and BP Amoco, this Agreement constitutes a valid and
     binding agreement of Merger Sub enforceable against Merger Sub in
     accordance with its terms, subject to the Bankruptcy and Equity Exception.
     BP Amoco, as Merger Sub's sole stockholder, has approved Merger Sub's
     execution, delivery and performance of this Agreement and has adopted this
     Agreement.

          II.1.12.  ARCO Employee Benefit Plans.
                    ---------------------------

               II.1.12.1.  Set forth in Section 2.1.12 of the ARCO Disclosure
          Letter are all significant compensation and benefit plans, contracts,
          policies or arrangements currently in effect for U.S. based employees
          covering current or former employees of ARCO and its Subsidiaries and
          current or former directors of ARCO, including, but not limited to,
          "employee benefit plans" within the meaning of Section 3(3) of the
          Employee Retirement Income Security Act of 1974, as amended ("ERISA"),
                                                                        -----
          and deferred compensation, stock option, stock purchase, stock
          appreciation rights, stock based, incentive and bonus plans (the "ARCO
                                                                            ----
          Compensation and Benefit Plans").  True and complete copies of all
          ------------------------------
          ARCO Compensation and Benefit Plans, including, but not limited to,
          any trust instruments and insurance contracts forming a part of any
          ARCO Compensation and Benefit Plan, and all amendments thereto have
          been provided or made available to BP Amoco.

               II.1.12.2.  Except as set forth in Section 2.1.12 of the ARCO
          Disclosure Letter, none of the execution and delivery of this
          Agreement by

                                      -27-
<PAGE>

          ARCO, the performance by ARCO of its obligations hereunder, the
          consummation of the transactions contemplated by this Agreement nor
          any other action taken or failed to be taken by ARCO prior to the
          execution of this Agreement will (a) limit ARCO's right, in its sole
          discretion, to administer, amend or terminate any ARCO Compensation
          and Benefit Plan or any related trust instrument, (b) entitle any
          employees of ARCO or any of its Subsidiaries to severance pay, (c)
          accelerate the time of payment or vesting or trigger any payment or
          funding (through a grantor trust or otherwise) of compensation,
          benefits or awards under, increase the amount payable or trigger any
          other material obligation pursuant to, any of the ARCO Compensation
          and Benefit Plans or (d) result in any breach or violation of, or a
          default under, any of the ARCO Compensation and Benefit Plans.

          II.1.13.  Environmental Matters.     Except as disclosed in its
                    ---------------------
     Reports filed prior to the date hereof and except for such matters that,
     individually or in the aggregate, have not had and would not reasonably be
     expected to have a Material Adverse Effect on it, to the knowledge of the
     BP Amoco Executive Officers or the ARCO Executive Officers, as applicable,
     (i) it and its Subsidiaries are in compliance with all applicable
     Environmental Laws; (ii) no property currently or formerly owned or
     operated by it or its Subsidiaries is contaminated with any Hazardous
     Substance requiring remediation under any Environmental Law; (iii) neither
     it nor any of its Subsidiaries is subject to liability under any
     Environmental Law for off-site disposal or contamination; (iv) neither it
     nor any of its Subsidiaries has received any claim, notice, demand or
     letter indicating that it may be in violation of, or subject to liability
     under, any Environmental Law; (v) neither it nor any of its Subsidiaries is
     subject to any order, decree, investigation, injunction or agreement with
     any Governmental Entity or any third party relating to any Environmental
     Law; and (vi) there are no other circumstances or conditions involving it
     or any of its Subsidiaries that reasonably could be expected to result in
     any claims, liabilities or costs in connection with any Environmental Law.

          As used herein, "Environmental Law" means any federal, state, local
                           -----------------
     and foreign law, regulation, order, decree, common law or agency
     requirement relating to the protection of the environment or human health
     and safety, and "Hazardous Substance" means any  substance, waste or
                      -------------------
     byproduct in any concentration that is listed, classified or regulated
     pursuant to any Environmental Law, including petroleum and petroleum
     products and wastes, mine tailings and wastes, asbestos, lead products and
     polychlorinated biphenyls.

                                      -28-
<PAGE>

          II.1.14.  ARCO Rights Plan.  Assuming that BP Amoco's representation
                    ----------------
     and warranty set forth in Section 2.1.10.1 is true and correct, the board
     of directors of ARCO has taken all action necessary to render the rights
     (the "Rights") issued under the Rights Agreement, dated as of July 24, 1995
           ------
     (the "Rights Agreement"), between ARCO and First Chicago Trust Company of
           ----------------
     New York inapplicable to the Merger, this Agreement, the Stock Option
     Agreement and the other transactions contemplated hereby and thereby.  ARCO
     will take all necessary action with respect to all of the outstanding
     Rights so that, as of immediately prior to the Effective Time, (A) neither
     ARCO nor BP Amoco will have any obligations under the Rights or the Rights
     Agreement and (B) the holders of the Rights will have no rights under the
     Rights or the Rights Agreement.

          II.1.15. ARCO Joint Ventures; Exclusivity Arrangements. For purposes
                   ---------------------------------------------
     of this Agreement, the material organizational documents, shareholder,
     membership or voting agreements and material agreements relating to the
     transfer of investments and management or operatorships to which it or any
     of its Subsidiaries is a party in connection with its joint ventures are
     referred to herein as the "Joint Venture Agreements", and the non-compete,
                                ------------------------
     exclusivity or similar agreements pursuant to which the ability of ARCO or
     any of its Subsidiaries or Affiliates of any of them to engage in any line
     of business, to contract with third parties or to do business in any
     geographic area is restricted in any material manner, and any area-of-
     mutual-interest agreements, are referred to herein as the "Exclusivity
                                                                -----------
     Agreements".  All of ARCO's Joint Venture Agreements and Exclusivity
     ----------
     Agreements are, with respect to it and its Subsidiaries, valid and in full
     force and effect on the date hereof except for any failures to be in full
     force and effect that, individually or in the aggregate, would not
     reasonably be expected to have a Material Adverse Effect on it.  Neither
     ARCO nor any of its Subsidiaries has violated any provision of, or
     committed or failed to perform any act which with or without notice, lapse
     of time or both would constitute a default under the provisions of, any of
     its Joint Venture Agreements or Exclusivity Agreements, except in each case
     for such violations, acts or omissions as, individually or in the
     aggregate, would not reasonably be expected to result in a Material Adverse
     Effect on it; it being understood that no effect arising out of the
     execution, performance or consummation of this Agreement shall be deemed to
     have a Material Adverse Effect for purposes of this Section 2.1.15.

          II.1.16.  Tax Matters.  Neither it nor any of its Affiliates has taken
                    -----------
     or agreed to take any action that would, or failed to take any action the
     omission of which would, or has reason to believe that any conditions exist
     that could reasonably be expected to (i) prevent or impede the Merger from
     qualifying as a reorganization under Section 368(a) of the Code or (ii)
     cause the Eligible ARCO Shareholders to

                                      -29-
<PAGE>

     recognize taxable gain with respect to the Merger pursuant to Section
     367(a) of the Code (except with respect to cash received in lieu of
     fractional interests in BP Amoco Depositary Shares).

          II.2.  Vastar.  Notwithstanding anything to the contrary in this
                 ------
Article II, ARCO does not make any representation or warranty with respect to
Vastar and its Subsidiaries (i) as of any date after the date hereof or (ii) for
matters covered by the fifth sentence of Section 2.1.2.2, clauses (B) and (C) of
Section 2.1.4.2, the last sentence of Section 2.1.6, and Section 2.1.12;
provided, however, that (x) ARCO represents and warrants as of the date hereof
- --------  -------
that, to the knowledge of the ARCO Executive Officers, without any investigation
or inquiry, the representations and warranties referred to in the foregoing
clause (ii) are true and accurate with respect to Vastar and its Subsidiaries
and (y) ARCO will make the representations and warranties contained in Sections
2.1.5.2 and 2.1.6(i) with respect to Vastar and its Subsidiaries as of the
Closing Date as though made on the Closing Date (except that any such
representation or warranty that by its terms expressly speaks as of an earlier
date shall be true and correct as of its date) for purposes of Section 4.2.1.


                                  ARTICLE III

                                   Covenants

          III.1.  Interim Operations.
                  ------------------

          III.1.1.  Interim Operations of BP Amoco.  BP Amoco covenants and
                    ------------------------------
     agrees as to itself and its Subsidiaries that, after the date hereof and
     until the Effective Time (unless ARCO shall otherwise approve in writing
     and except as contemplated by the Share Subdivision, as otherwise
     contemplated by the BP Amoco Circular, as otherwise expressly contemplated
     by or provided in this Agreement (including the BP Amoco Disclosure
     Letter), or as required by applicable Law):

               III.1.1.1.  BP Amoco shall not:

                    (i) amend its memorandum and articles of association in any
          manner that would adversely affect the rights of any Party under this
          Agreement, the transactions contemplated hereby or the rights of
          holders of BP Amoco Ordinary Shares or BP Amoco Depositary Shares;

                                      -30-
<PAGE>

                    (ii)  split, combine, subdivide or reclassify its
          outstanding shares of capital stock;

                    (iii) declare, set aside or pay any dividend or distribution
          payable in cash, stock or property in respect of any capital stock
          other than (A) regular quarterly cash dividends on BP Amoco Ordinary
          Shares consistent with past practice, including periodic dividend
          increases consistent with past practice, and (B) regular cash
          dividends on the issued and outstanding BP Amoco First Preference
          Shares and BP Amoco Second Preference Shares; or

                    (iv)  repurchase, redeem or otherwise acquire, or permit any
          of its Subsidiaries to purchase, redeem or otherwise acquire (except
          for repurchases, redemptions or acquisitions (A) required by the terms
          of its capital stock or securities outstanding on the date hereof or
          (B) required by or in connection with the respective terms as of the
          date hereof of any Option Schemes or any dividend reinvestment plan as
          in effect on the date hereof in the ordinary course of the operation
          of such plans) any shares of the capital stock of BP Amoco or any
          securities convertible into or exchangeable or exercisable for any
          shares of the capital stock of BP Amoco;

               III.1.1.2. neither BP Amoco nor any of its Subsidiaries shall
          issue, sell, pledge, dispose of or encumber any shares of, or
          securities convertible into or exchangeable or exercisable for, or
          rights, options, warrants, conversion rights, stock appreciation
          rights, redemption rights, repurchase rights, agreements,
          arrangements, calls, commitments or rights of any kind to acquire, the
          capital stock of BP Amoco of any class (other than (x) BP Amoco
          Ordinary Shares issuable or transferable pursuant to (A) options
          outstanding on the date hereof under the Option Schemes, (B)
          additional options or rights to acquire BP Amoco Ordinary Shares
          granted under the terms of any Option Scheme as in effect on the date
          hereof or as amended, or any similar option scheme adopted in
          replacement of or as an enhancement to any such option scheme, in each
          case in the ordinary course of the operation of such option scheme,
          and (C) the DSC II Share Exchange, (y) BP Amoco Ordinary Shares
          issuable or transferable pursuant to such options or rights so granted
          and (z) issuances of securities in connection with grants, awards or
          issuances of stock-based compensation);

               III.1.1.3.  subject to the provisions of Section 3.5.1, neither
          BP Amoco nor any of its Subsidiaries shall take any action or omit to
          take any

                                      -31-
<PAGE>

          action for the purpose of preventing, delaying or impeding the
          consummation of the Merger or the other transactions contemplated by
          this Agreement and the Stock Option Agreement including any action or
          omission that would cause (i) the Merger to fail to qualify as a
          reorganization under Section 368(a) of the Code or (ii) the exchange
          of BP Amoco Shares for ARCO Common Shares in the Merger to fail to
          qualify for nonrecognition of gain (except with respect to (a) cash
          received in lieu of fractional interests in BP Amoco Depositary Shares
          or (b) stockholders of ARCO that are not Eligible ARCO Shareholders);
          and

               III.1.1.4.  neither BP Amoco nor any of its Subsidiaries shall
          authorize or enter into an agreement to do any of the foregoing.

          III.1.2.  Interim Operations of ARCO.  ARCO covenants and agrees as to
                    --------------------------
     itself and its Subsidiaries that, after the date hereof and until the
     Effective Time (unless BP Amoco shall otherwise approve in writing and
     except as otherwise expressly contemplated by or provided in this Agreement
     (including the ARCO Disclosure Letter) or the Stock Option Agreement, or as
     required by applicable Law, and subject to Section 3.17):

               III.1.2.1.  the business of ARCO and its Subsidiaries shall be
          conducted in the ordinary and usual course and, to the extent
          consistent therewith, ARCO and each of its Subsidiaries shall use
          their respective best reasonable efforts to preserve its business
          organization intact and maintain its existing relations, status and
          goodwill with customers, suppliers, creditors, state, federal and
          foreign governmental authorities, lessors, employees and business
          associates;

               III.1.2.2.  ARCO shall not:

                    (i) amend its restated certificate of incorporation; amend
          its by-laws in any manner that would adversely affect the rights of
          any Party under this Agreement or the transactions contemplated hereby
          or affect the rights of holders of ARCO Common Shares; or, subject to
          the fiduciary duties of ARCO's board of directors, amend, modify or
          terminate the Rights Agreement;

                    (ii) split, combine, subdivide or reclassify its outstanding
          shares of capital stock;

                                      -32-
<PAGE>

                    (iii) declare, set aside or pay any dividend or distribution
          payable in cash, stock or property in respect of any capital stock
          other than (A) regular quarterly cash dividends on ARCO Common Shares
          not in excess of the quarterly cash dividends declared by ARCO in the
          quarter ended December 31, 1998 and (B) regular cash dividends on the
          issued and outstanding shares of ARCO Preference Stock; or

                    (iv)  repurchase, redeem or otherwise acquire, or permit any
          of its Subsidiaries to purchase, redeem or otherwise acquire (except
          for repurchases, redemptions or acquisitions (A) required by the terms
          of its capital stock or securities outstanding on the date hereof, (B)
          required by or in connection with the respective terms as of the date
          hereof of any ARCO Stock Plans or any dividend reinvestment plan as in
          effect on the date hereof in the ordinary course of the operation of
          such plans or (C) effected to acquire ARCO Common Shares from DSC II)
          any shares of the capital stock of ARCO or any securities convertible
          into or exchangeable or exercisable for any shares of the capital
          stock of ARCO;

               III.1.2.3.  neither ARCO nor any of its Subsidiaries shall:

                    (i) issue, sell, pledge, dispose of or encumber any shares
          of, or securities convertible into or exchangeable or exercisable for,
          or rights, options, warrants, conversion rights, stock appreciation
          rights, redemption rights, repurchase rights, agreements,
          arrangements, calls, commitments or rights of any kind to acquire, the
          capital stock of ARCO of any class (other than (A) ARCO Common Shares
          issuable or deliverable (x) pursuant to options outstanding on the
          date hereof under the ARCO Stock Plans, (y) in connection with the
          conversion of shares of ARCO Preference Stock in accordance with their
          terms or (z) pursuant to the Stock Option Agreement; (B) issuances of
          ARCO Common Shares, including Restricted Stock, Performance-Based
          Restricted Stock, Contingent Restricted Stock and Dividend Share
          Credits, in connection with grants and awards made prior to the date
          hereof; (C) issuances of securities in connection with grants, awards
          or issuances of stock-based compensation made in accordance with
          Section 3.1.2.4; (D) Rights issuable pursuant to the Rights Agreement
          in respect of ARCO Common Shares issued or to be issued in accordance
          with this clause (i) or Section 3.1.2.4; (E) ARCO Common Shares
          issuable upon the exercise of Rights; or (F) ARCO Common Shares
          exchangeable for BP Amoco Depositary Shares in the DSC II Share
          Exchange);

                                      -33-
<PAGE>

                    (ii)  transfer, lease, license, sell or otherwise dispose of
          any of its property or assets (including capital stock of any of its
          Subsidiaries), including any contribution of property or assets to a
          joint venture (including any joint venture that may be entered into
          pursuant to Section 3.1.2.3 (vii)) and any transfer or disposition in
          connection with financing transactions, other than property or assets
          having an aggregate fair market value of not more than $500 million;

          provided, however, that ARCO shall not transfer, lease, license, sell
          --------  -------
          or otherwise dispose of any individual property or asset with a fair
          market value in excess of $50 million without first consulting with BP
          Amoco;

                    (iii) incur any indebtedness except for (x) long-term
          indebtedness not in excess of $1.5 billion incurred in connection with
          the refinancing of existing indebtedness and (y) commercial paper and
          short-term indebtedness repayable upon less than 30 days' notice
          without penalty (other than LIBOR "breakage" costs); provided,
                                                               --------
          however,  that ARCO shall provide reasonable advance notice to and
          -------
          consult with BP Amoco on the development of, and any proposed changes
          in, ARCO's plans for such refinancings contemplated by clause (x)
          (including expected maturities and other material terms);

                    (iv)  make capital expenditures in an aggregate amount in
          excess of $2.7 billion during 1999 and $2.7 billion during 2000, plus,
                                                                           ----
          in each year no more than an additional 15% of such limit, after
          reasonable advance notice to and consultation with BP Amoco with
          respect to ARCO's plans for such additional capital expenditures; or,
          without first consulting with BP Amoco, authorize or commit to any
          individual future capital expenditure in an amount in excess of $50
          million unless such consultation would be inconsistent with applicable
          Laws;

                    (v)   by any means make or authorize or commit to any
          acquisition of, or investment in, assets or stock of any other Person
          or entity except to the extent that such acquisition or investment is
          a capital expenditure permitted pursuant to Section 3.1.2.3(iv) or a
          contribution to a joint venture permitted pursuant to Section
          3.1.2.3(ii);

                    (vi)  terminate any existing line of business;  or

                    (vii) without reasonable advance notice to and consultation
          with BP Amoco, enter into any new shareholder, membership or voting
          agreements or other agreements relating to the transfer of investments
          or

                                      -34-
<PAGE>

          management or operatorships in connection with joint ventures other
          than any such agreements with respect to which the total book value or
          fair market value (whichever is greater) of all of the assets of ARCO
          and its Subsidiaries to be employed in or subject to the relevant
          joint venture is less than $200 million;

               III.1.2.4.  neither ARCO nor any of its Subsidiaries shall

                    (i) terminate, establish, adopt, enter into, make any new
          (or accelerate or otherwise modify any existing) grants or awards of
          stock-based compensation or other benefits under, amend or otherwise
          modify any ARCO Compensation and Benefit Plan except for (A) grants or
          awards to directors, officers and employees of it or any of its
          Subsidiaries under existing ARCO Compensation and Benefit Plans in the
          ordinary and usual course of business consistent with past practice
          (which shall include normal periodic performance reviews and the
          making of related grants and awards with provisions consistent with
          past practice; but shall not include any grants or awards that would
          accelerate, vest or become payable solely as a result of the
          consummation of the transactions contemplated by this Agreement) and,
          with respect to stock-based compensation, in any event not in excess
          of a number of grants or awards (x) granted after the date of this
          Agreement and before December 31, 1999 that would (currently or with
          the passage of time or the fulfillment of conditions), in the
          aggregate, entitle the holders thereof to receive or to purchase
          200,000 ARCO Common Shares pursuant to at-market stock options; and
          (y) granted after February 1, 2000 that would (currently or with the
          passage of time or the fulfillment of conditions), in the aggregate,
          entitle the holders thereof to receive or to purchase 1.5 million ARCO
          Common Shares pursuant to at-market stock options and 250,000 ARCO
          Common Shares pursuant to other equity-based awards, except that
          additional stock options may be substituted for other equity-based
          awards on an equivalent value basis, with calculation of the value of
          each equity instrument based on reasonable and customary valuation
          methods; (B) actions necessary to satisfy existing contractual
          obligations under ARCO Compensation and Benefit Plans in force as of
          the date hereof, as required by law or under the terms of any
          collective bargaining agreement or any other action in the ordinary
          and usual course of business which would not significantly increase
          the cost of such plan to ARCO; and (C) actions necessary in order to
          extend the effectiveness of the Enhanced Retirement Program as set
          forth in Section 41 of the ARCO Retirement Plan,  Section 19 of the
          CH-Twenty, Inc. Retirement Plan and Section 4A and 5A of the ARCO


                                      -35-
<PAGE>

          Special Termination Allowance Plan (the "Enhanced Retirement
          Program"), including but not limited to the final average salary
          feature, as currently in effect, for  qualifying terminations of
          employment occurring within two years following the Effective Time;

                    (ii)  increase the salary, wage, bonus or other compensation
          of any directors, officers or employees except for (A) increases
          occurring in the ordinary and usual course of business (which shall
          include normal periodic performance reviews and related compensation
          and benefit increases and increases reasonably required to maintain
          competitive compensation (based on market data) for specialized
          employees) and  (B) the provision of individual compensation and
          benefit plans or agreements for newly hired or appointed officers or
          employees in the ordinary and usual course of business consistent with
          past practice; or

                    (iii) make any determination with respect to the
          satisfaction of performance objectives under the ARCO Compensation and
          Benefit Plans other than reasonable determinations that are consistent
          with past practice;

               III.1.2.5. subject to the provisions of Section 3.5.1, neither
          ARCO nor any of its Subsidiaries shall take any action or omit to take
          any action for the purpose of preventing, delaying or impeding the
          consummation of the Merger or the other transactions contemplated by
          this Agreement and the Stock Option Agreement including any action or
          omission that would cause (i) the Merger to fail to qualify as a
          reorganization under Section 368(a) of the Code or (ii) the exchange
          of BP Amoco Shares for ARCO Common Shares in the Merger to fail to
          qualify for nonrecognition of gain (except with respect to (a) cash
          received in lieu of fractional interests in BP Amoco Depositary Shares
          or (b) stockholders of ARCO who are not Eligible ARCO Shareholders);

               III.1.2.6. ARCO shall timely satisfy, or cause to be timely
          satisfied, all applicable tax reporting and filing requirements
          contained in the Code with respect to the transactions contemplated
          hereby, including, without limitation, the reporting requirements
          contained in United States Treasury Regulation Section 1.367(a)-
          3(c)(6);

               III.1.2.7. neither ARCO nor any of its Subsidiaries shall:

                                      -36-
<PAGE>

                    (i)    without reasonable advance notice to and consultation
          with BP Amoco (unless BP Amoco is an adverse party with respect to
          such claim or litigation or to the extent such consultation would
          result in ARCO waiving its attorney-client privilege with respect to
          such claim or litigation), settle or compromise any claims or
          litigation where the amount of any such settlement or compromise
          exceeds $50,000,000; or

                    (ii)   make any election with respect to taxes that could
          reasonably be expected to have a Material Adverse Effect on it;

               III.1.2.8.  ARCO shall not modify any accounting policy except as
          may be required by changes in Law or in U.S. GAAP;

               III.1.2.9.  ARCO shall not create, write down or change any
          material reserve, except in the ordinary and usual course of business,
          without reasonable advance notice to and consultation with BP Amoco;
          and

               III.1.2.10. neither ARCO nor any of its Subsidiaries shall
          authorize or enter into an agreement to do any of the foregoing.

          III.1.3.  Consultation as to Material Contracts.  ARCO shall
                    -------------------------------------
     cooperate with BP Amoco promptly after the date hereof in identifying and
     creating a list of Contracts that may be considered material to ARCO and
     its Subsidiaries.  ARCO agrees that it will provide reasonable advance
     notice to and consult with BP Amoco with respect to any material amendment,
     modification or termination of, or any waiver, release or assignment of any
     material rights or claims under, the Contracts so identified and listed
     other than in the ordinary and usual course of business of ARCO and its
     Subsidiaries.

          III.2.    ARCO Acquisition Proposals.
                    --------------------------

          III.2.1.  ARCO agrees that, subject to Section 3.2.3 and except as
     expressly contemplated by this Agreement, neither it nor any of its
     Subsidiaries nor any of the officers or directors of it or any of its
     Subsidiaries shall, and that it shall direct and use its best efforts to
     cause its and its Subsidiaries' employees, investment bankers, attorneys,
     accountants, financial advisors, agents or other representatives
     (collectively, the "ARCO Representatives") not to, directly or indirectly,
                         --------------------
     initiate, solicit, encourage or otherwise facilitate any inquiries or the
     making of any proposal or offer with respect to a merger, reorganization,
     share exchange, dual-holding company transaction, consolidation or similar
     transaction involving

                                      -37-
<PAGE>

     ARCO, or any purchase of, or offer to purchase, all or substantially all of
     the equity securities of ARCO or of its and its Subsidiaries' assets taken
     as a whole (any such proposal or offer being hereinafter referred to as an
     "ARCO Acquisition Proposal"). ARCO further agrees that neither it nor any
      -------------------------
     of its Subsidiaries nor any of its or its Subsidiaries' officers or
     directors shall, and that it shall direct and use its best efforts to cause
     the ARCO Representatives not to, directly or indirectly, have any
     discussions with or provide any confidential information or data to any
     Person relating to an ARCO Acquisition Proposal or engage in any
     negotiations concerning an ARCO Acquisition Proposal, or otherwise
     facilitate any effort or attempt to make or implement an ARCO Acquisition
     Proposal; provided, however, that nothing contained in this Agreement shall
               --------  -------
     prevent ARCO or its board of directors from (i) making any disclosure to
     its stockholders if, in the good faith judgment of its board of directors,
     failure so to disclose would be inconsistent with its obligations under
     applicable Law; (ii) negotiating with or furnishing information to any
     Person who has made a bona fide written ARCO Acquisition Proposal which did
     not result from a breach of this Section 3.2.1; or (iii) recommending such
     an ARCO Acquisition Proposal to its stockholders (and in connection
     therewith withdraw its approval or favorable recommendation to stockholders
     of this Agreement), if and only to the extent that, in the case of actions
     referred to in clause (ii) or clause (iii), such ARCO Acquisition Proposal
     is a Superior Proposal (as defined below). For purposes of this Agreement,
     a "Superior Proposal" means any ARCO Acquisition Proposal by a third party
        -----------------
     (x) on terms which the board of directors of ARCO determines in its good
     faith judgment after consultation with its financial advisors, to be more
     favorable from a financial point of view to its stockholders than the
     Merger and the other transactions contemplated hereby, and (y) which the
     ARCO board of directors determines in its good faith judgment to constitute
     a transaction that is reasonably likely to be consummated on the terms set
     forth, taking into account all legal, financial, regulatory and other
     aspects of such proposal. ARCO agrees that it will, on the date hereof,
     immediately cease and cause to be terminated any existing activities,
     discussions or negotiations with any Person conducted heretofore with
     respect to any ARCO Acquisition Proposal. ARCO also agrees that if it has
     not already done so, it will promptly request each Person, if any, that has
     heretofore executed a confidentiality agreement within the 12 months prior
     to the date hereof in connection with its consideration of any ARCO
     Acquisition Proposal to return or destroy all confidential information
     heretofore furnished to such Person by or on behalf of it or any of its
     Subsidiaries.

          III.2.2.  ARCO agrees that it will take the necessary steps promptly
     to inform its Subsidiaries and its Subsidiaries' officers, directors and
     the ARCO Representatives of the obligations undertaken in this Section 3.2.
     ARCO agrees

                                      -38-
<PAGE>

     that it will notify BP Amoco promptly if any such inquiries, proposals or
     offers relating to or constituting an ARCO Acquisition Proposal are
     received by, any such information is requested from, or any such
     discussions or negotiations are sought to be initiated or continued with,
     any of its or its Subsidiaries' officers, directors and the ARCO
     Representatives indicating, in connection with such notice, the name of
     such Person and the material terms and conditions of any proposals or
     offers and thereafter shall keep BP Amoco informed, on a current basis, of
     the status and material terms and conditions of any such proposals or
     offers. ARCO shall give BP Amoco at least five business days' notice of all
     material terms and conditions of each ARCO Acquisition Proposal and the
     opportunity to respond to such ARCO Acquisition Proposal prior to any
     action by the ARCO board of directors approving the execution and delivery
     of a definitive agreement to implement a transaction in respect of such
     ARCO Acquisition Proposal.

          III.2.3.  Nothing contained herein shall prohibit ARCO from taking and
     disclosing to its stockholders a position contemplated by Rule 14e-2(a)
     under the Exchange Act with respect to an ARCO Acquisition Proposal by
     means of a tender or exchange offer.

                                      -39-
<PAGE>

          III.3.    Information Supplied.
                    --------------------

          III.3.1.  Registration Statement.
                    ----------------------

                    III.3.1.1.  Each of BP Amoco and ARCO shall cooperate with
          respect to and as promptly as practicable prepare, and BP Amoco shall
          file with the SEC as soon as practicable, a Registration Statement on
          Form F-4 (the "Form F-4") under the Securities Act, with respect to
                         --------
          the issuance pursuant to this Agreement and the Share Exchange
          Agreement of BP Amoco Shares, which Registration Statement shall
          include the proxy statement/prospectus to be sent to holders of ARCO
          Common Shares (the "ARCO Proxy Statement") and, so far as appropriate,
                              --------------------
          the BP Amoco Documents (as defined in Section 3.3.2.1).  The Parties
          will cause the Form F-4 to comply as to form in all material respects
          with the applicable provisions of the Securities Act and the rules and
          regulations thereunder.  Each of BP Amoco and ARCO shall use its
          respective best reasonable efforts to have the Form F-4 declared
          effective by the SEC as promptly as practicable after such filing.  BP
          Amoco shall use its reasonable efforts to obtain, prior to the
          effective date of the Form F-4, all necessary state securities law or
          "Blue Sky" permits or approvals required to carry out the transactions
          contemplated by this Agreement.  BP Amoco will advise ARCO, promptly
          after it receives notice thereof, of the time when the Form F-4 has
          become effective or any supplement or amendment has been filed, the
          issuance of any stop order, the suspension of the qualification of the
          BP Amoco Shares issuable in connection with the Merger for offering or
          sale in any jurisdiction, or any request by the SEC for amendment of
          the ARCO Proxy Statement or the Form F-4 or comments thereon and
          responses thereto or requests by the SEC for additional information.

                    III.3.1.2.  BP Amoco and ARCO each agrees, as to itself and
          its Subsidiaries, that none of the information supplied or to be
          supplied by it or its Subsidiaries for inclusion or incorporation by
          reference in the Form F-4, including, without limitation, the ARCO
          Proxy Statement, and any amendment or supplement thereto will, at the
          time the Form F-4 becomes effective under the Securities Act, at the
          date of mailing to stockholders and at the time or times of the ARCO
          Stockholders Meeting (as defined in Section 3.4), contain any untrue
          statement of a material fact or omit to state any material fact
          required to be stated therein or necessary in order to make the
          statements therein, in the light of the circumstances under which they
          were made, not misleading. If at any time prior to the date of the
          ARCO Stockholders Meeting any information relating to ARCO or BP

                                      -40-
<PAGE>

          Amoco, or any of their respective Affiliates, officers or directors,
          should be discovered by ARCO or BP Amoco which should be set forth in
          an amendment to the Form F-4 or a supplement to the ARCO Proxy
          Statement, so that such document would not include any misstatement of
          a material fact or omit to state any material fact required to be
          stated therein or necessary to make the statements therein, in the
          light of the circumstances under which they were made, not misleading,
          the Party which discovers such information shall promptly notify the
          other Party and, to the extent required by Law, an appropriate
          amendment or supplement describing such information shall be promptly
          filed with the SEC and, to the extent required by law, disseminated to
          the ARCO stockholders.

                    III.3.1.3. ARCO will use its best reasonable efforts to
          cause the definitive ARCO Proxy Statement to be mailed to its
          stockholders as promptly as practicable after the date hereof.

          III.3.2.  BP Amoco Documents.
                    ------------------

               III.3.2.1.  BP Amoco shall, with the reasonable assistance of
          ARCO, as promptly as practicable prepare and file with the LSE (a) a
          circular to be sent to BP Amoco shareholders in connection with the BP
          Amoco Shareholders Meeting (as defined in Section 3.4) (the "BP Amoco
                                                                       --------
          Circular"), containing (i) a notice convening the BP Amoco
          --------
          Shareholders Meeting, (ii) such other information (if any) as may be
          required by the LSE and (iii) such other information as BP Amoco and
          ARCO shall agree to include therein; and (b) listing particulars or an
          exempt listing document relating to BP Amoco and its Subsidiaries and
          the BP Amoco Ordinary Shares (together with any summary thereof, the

          "BP Amoco Listing Document," and the BP Amoco Circular and  the BP
          --------------------------
          Amoco Listing Document, together, the "BP Amoco Documents").  BP Amoco
                                                 ------------------
          and ARCO each agrees, as to itself and its Subsidiaries, that the BP
          Amoco Documents and any supplements thereto and any circulars or
          documents issued to shareholders, employees or debentureholders of BP
          Amoco, will contain all particulars relating to BP Amoco and ARCO
          required to comply in all material respects with all United Kingdom
          statutory and other legal provisions (including, without limitation,
          the Companies Act, the Financial Services Act 1986 (the "FSA") and the
                                                                   ---
          rules and regulations made thereunder, and the rules and requirements
          of the LSE) and all such information contained in the BP Amoco
          Documents will be substantially

                                      -41-
<PAGE>

          in accordance with the facts and will not omit anything material
          likely to affect the import of such information.

                    III.3.2.2.  BP Amoco will use its best reasonable efforts to
          cause the BP Amoco Documents to receive any clearance thereof required
          from the LSE and to cause the definitive BP Amoco Documents to be
          mailed to its shareholders, in each case as promptly as practicable
          after the date hereof.

                    III.3.2.3. Notwithstanding any of the other provisions of
          this Section 3.3 and for the avoidance of doubt, BP Amoco hereby
          agrees that (i) for the purposes of the preparation of the BP Amoco
          Circular and the BP Amoco Listing Document and any amendments or
          supplements thereto, ARCO shall only be obliged (pursuant to such
          other provisions) to supply BP Amoco with information to the extent
          that it relates solely to ARCO and/or its Subsidiaries, and (ii)
          neither ARCO, nor any of its Subsidiaries, nor any of its or their
          directors or other officers shall accept any responsibility for either
          the BP Amoco Circular or the BP Amoco Listing Document or the
          information included therein or omitted therefrom.

          III.4.  Shareholders Meetings.  ARCO will take all action necessary
                  ---------------------
to convene a special meeting of the holders of ARCO Common Shares at which the
holders of ARCO Common Shares shall consider the adoption of this Agreement
(including any adjournments or postponements thereof, the "ARCO Stockholders
                                                           -----------------
Meeting") as promptly as practicable after the Form F-4 has been declared
- -------
effective by the SEC.  BP Amoco will take all action necessary to convene an
extraordinary general meeting of BP Amoco shareholders at which an ordinary
resolution will be proposed to consider the approval of the Merger (the "BP
                                                                         --
Amoco Shareholder Meeting") after the BP Amoco Documents are cleared by the LSE
- -------------------------
and the Form F-4 has been declared effective by the SEC.  BP Amoco and ARCO each
agrees to use best reasonable efforts such that, to the extent practical, the
ARCO Stockholders Meeting and the BP Amoco Shareholders Meeting each shall be
held as promptly as practicable after the conditions precedent to holding such
meeting have been fulfilled and as nearly contemporaneously as practicable.
Subject to the terms of this Agreement, including the provisions of Section 3.2,
the board of directors of each of BP Amoco and ARCO shall recommend to its
respective shareholders, in the case of BP Amoco, the approval of the Merger
and, in the case of ARCO, the adoption of the Merger Agreement and shall use
best reasonable efforts to solicit such adoption unless it concludes, in the
exercise of its fiduciary duties, after consultation with outside counsel, that
the Merger is no longer advisable for its shareholders; provided, however, that
                                                        --------  -------
neither BP Amoco nor ARCO shall be entitled to withdraw its recommendation to
its

                                      -42-
<PAGE>

respective shareholders if to do so would be inconsistent with the obligations
it has expressly assumed elsewhere in this Agreement. In the event that
subsequent to the date hereof, the board of directors of BP Amoco and/or ARCO
determines that the Merger or the Merger Agreement, as the case may be, is no
longer advisable and recommends that its respective shareholders reject it, BP
Amoco shall nevertheless submit the Merger to the holders of BP Amoco Voting
Shares for approval at the BP Amoco Shareholders meeting and ARCO shall
nevertheless submit this Agreement to the holders of ARCO Common Shares, for
adoption at the ARCO Stockholders Meeting, in each case unless this Agreement
shall have been terminated in accordance with its terms prior to the date of the
applicable meeting.

          III.5.   Filings; Other Actions; Notification.
                   ------------------------------------

          III.5.1. BP Amoco and ARCO shall each cooperate with the other and
     (i) use (and shall use best reasonable efforts to cause their respective
     Subsidiaries to use) all their respective best reasonable efforts promptly
     to take or cause to be taken all actions, and do or cause to be done all
     things, necessary, proper or advisable under this Agreement, the Stock
     Option Agreement and applicable Laws to consummate and make effective the
     Merger and the other transactions contemplated by this Agreement and the
     Stock Option Agreement as soon as practicable, including preparing and
     filing as promptly as practicable all documentation to effect all necessary
     filings, notices, petitions, statements, registrations, submissions of
     information, applications and other documents, (ii) use (and shall use best
     reasonable efforts to cause their respective Subsidiaries to use) all their
     respective best reasonable efforts to obtain as promptly as practicable all
     approvals, consents, registrations, permits, authorizations and other
     confirmations required to be obtained from any third party (other than BP
     Amoco Required Consents and ARCO Required Consents) necessary, proper or
     advisable to consummate the Merger and the other transactions contemplated
     by this Agreement and the Stock Option Agreement, and (iii) use (and shall
     use best reasonable efforts to cause their respective Subsidiaries to use)
     their respective best reasonable efforts to take or cause to be taken all
     actions, and do or cause to be done all things, necessary, proper or
     advisable to obtain the BP Amoco Required Consents or ARCO Required
     Consents, as the case may be; it being understood that, for purposes of
     this Section 3.5, the Parties agree that "best reasonable efforts" shall
     require (without limitation of any other meaning of such words) each Party
     to accept or agree to, at such time as may be required to cause the
     condition set forth in Section 4.1.2 to be fulfilled prior to the
     Termination Date, as it may be extended pursuant to Section 5.2, any
     conditions, terms or restrictions in connection with any such BP Amoco
     Required Consent or ARCO Required Consent, as the case may be, unless all
     such conditions, terms and

                                      -43-
<PAGE>

     restrictions, in the aggregate, would be reasonably likely to have a
     Material Adverse Effect on BP Amoco or ARCO after the Effective Time (it
     being understood that, for this purpose materiality shall be considered
     solely with respect to the total value of the U.S. operations of BP Amoco,
     ARCO and their Subsidiaries, taken together). Subject to applicable Laws
     relating to the exchange of information, BP Amoco and ARCO shall have the
     right to review in advance, and to the extent practicable each will consult
     the other on, all the information relating to ARCO and its Subsidiaries or
     BP Amoco and its Subsidiaries, as the case may be, that appears in any
     filing made with, or written materials submitted to, any third party and/or
     any Governmental Entity in connection with the Merger and the other
     transactions contemplated by this Agreement and the Stock Option Agreement.
     In exercising the foregoing right, each of BP Amoco and ARCO shall act
     reasonably and as promptly as practicable.

          III.5.2.  BP Amoco and ARCO each shall, upon request by and reasonable
     notice from the other, furnish the other with all information concerning
     itself, its Subsidiaries, directors, officers and shareholders or
     stockholders and such other matters as may be reasonably necessary or
     advisable in connection with the Form F-4, the BP Amoco Documents, the ARCO
     Proxy Statement or any other necessary or appropriate filing, notice,
     petition, statement, registration, submission of information or application
     made by or on behalf of BP Amoco or ARCO or any of their respective
     Subsidiaries to any third party and/or any Governmental Entity in
     connection with the Merger and the other transactions contemplated by this
     Agreement and the Stock Option Agreement.

          III.5.3.  BP Amoco and ARCO each shall keep the other apprised of the
     status of matters relating to completion of the Merger and the other
     transactions contemplated by this Agreement and the Stock Option Agreement,
     including promptly furnishing the other with copies of notices or other
     communications received by BP Amoco or ARCO, as the case may be, or any of
     its Subsidiaries, from any third party and/or any Governmental Entity with
     respect to the Merger and the other transactions contemplated by this
     Agreement and the Stock Option Agreement.  BP Amoco and ARCO each shall
     give prompt notice to the other of any change that would, individually or
     in the aggregate,  reasonably be expected to result in a Material Adverse
     Effect on it or of any failure of any condition set forth in Article IV to
     the other Party's obligations to effect the Merger.

          III.5.4.  Prior to making any filing, notice, petition, statement,
     registration, submission of information or application to or with any third
     party and/or Governmental Entity (including any domestic or foreign
     national securities exchange) in connection with the consummation of the
     Merger and the other

                                      -44-
<PAGE>

     transactions contemplated by this Agreement and the Stock Option Agreement
     and except as may be required by Law or by obligations pursuant to any
     listing agreement with or rules of any domestic or foreign national
     securities exchange, each Party shall make all reasonable efforts to
     consult with the other Party with respect to the content of such filing,
     notice, petition, statement, registration, submission of information or
     application and to provide the other Party with copies of the proposed
     filing, notice, petition, statement, registration, submission of
     information or application. Neither BP Amoco nor ARCO shall agree to
     participate in any meeting with any Governmental Entity in respect of any
     filings, investigation or other inquiry relating to the Merger and the
     other transactions contemplated by this Agreement or the Stock Option
     Agreement unless it consults with the other Party in advance and, to the
     extent practicable and permitted by such Governmental Entity, gives the
     other Party the opportunity to attend and participate thereat.

          III.5.5.  In the event any claim, action, suit, investigation or other
     proceeding by any Governmental Entity or other Person or other legal or
     administrative proceeding is commenced that questions the validity or
     legality of this Agreement, the Stock Option Agreement, or the Merger or
     the other transactions contemplated by this Agreement and the Stock Option
     Agreement or claims damages in connection therewith, the Parties agree to
     cooperate and use their best reasonable efforts, subject to the limitations
     set forth in Section 3.5.1, to defend against, respond to and resolve such
     claim, action, suit, investigation or other proceeding in a manner that
     permits the consummation of the Merger prior to the Termination Date.

          III.6.  Access.   In order to facilitate consummation of the Merger
                  ------
and the other transactions contemplated by this Agreement, the Parties hereby
agree that upon reasonable request to any executive officer of BP Amoco or ARCO,
as the case may be, designated for the purpose, and except as may otherwise be
required by applicable Law, BP Amoco and ARCO each shall (and shall cause its
Subsidiaries to) afford the other's officers, employees, investment bankers,
attorneys, accountants, financial advisors, agents or other representatives
reasonable access, during normal business hours throughout the period prior to
the Effective Time, to its properties, books, contracts and records and, during
such period, each shall (and shall cause its Subsidiaries to) furnish promptly
to the other all information concerning its business, properties and personnel
as may reasonably be requested, provided that no receipt of information pursuant
                                --------
to this Section shall affect or be deemed to modify any representation or
warranty made by BP Amoco or ARCO hereunder, and provided, further, that the
                                                 --------  -------
foregoing shall not require BP Amoco or ARCO to permit any inquiry, or to
disclose any information, that in the reasonable judgment of BP Amoco or ARCO,
as the case may be, would (i) violate any

                                      -45-
<PAGE>

antitrust or competition Law or (ii) result in the disclosure of any trade
secrets of third parties or violate any of its obligations with respect to
confidentiality to third parties unless the consent of such third party is
obtained (and BP Amoco or ARCO, as the case may be, shall use its reasonable
efforts to obtain the consent of such third party to such inspection or
disclosure). All such information shall be governed by the terms of the
Confidentiality Agreement, dated January 28, 1999, between BP Amoco and ARCO
(the "Confidentiality Agreement"), including without limitation all such
      -------------------------
information disclosed in the Disclosure Letters.

          III.7.  Publicity.  The initial press release concerning this
                  ---------
Agreement, the Merger and the other transactions contemplated by this Agreement
and the Stock Option Agreement shall be a joint press release, and thereafter BP
Amoco and ARCO shall consult with each other prior to issuing any press releases
or otherwise making public announcements with respect to the Merger and the
other transactions contemplated by this Agreement and the Stock Option
Agreement.

          III.8.  Benefits and Other Matters.
                  --------------------------

               III.8.1.  Employee Benefits.
                         -----------------

               III.8.1.1.  It is the specific intention of the Parties that the
          compensation and benefit programs (including annual and long-term
          incentive programs) to be provided by BP Amoco and its Subsidiaries
          for current and former employees of ARCO will be no less favorable in
          the aggregate than is provided to similarly situated employees of BP
          Amoco and its Subsidiaries.

               III.8.1.2.  For at least one year following the Effective Time,
          BP Amoco shall provide or cause to be provided to current and former
          employees and directors of ARCO and its Subsidiaries compensation and
          benefits that are at least as favorable in the aggregate (taking into
          account the benefits provided pursuant to this Section 3.8) as the
          compensation and benefits they were entitled to receive immediately
          prior to the Effective Time (including, without limitation, benefits
          pursuant to qualified and non-qualified retirement plans, savings
          plans, medical plans and programs, deferred compensation arrangements,
          incentive plans, and retiree benefit plans, policies and
          arrangements); provided, however, that, with respect to employees who
                         --------  -------
          are subject to collective bargaining, all benefits shall be provided
          in accordance with the applicable collective bargaining or other labor
          agreements; and provided, further, that all incentive, bonus and
                          --------  -------

                                      -46-
<PAGE>

          similar plans shall after the Effective Time be substantially
          performance-based.

               III.8.1.3.  BP Amoco shall cause (i) ARCO's and its Subsidiaries'
          (other than Vastar's) existing severance programs (as in effect
          immediately prior to the Effective Time) to continue without any
          reduction in benefits for at least two years following the Effective
          Time; (ii) beginning with the first full plan year after the Effective
          Time, interest to be credited to the accounts of participants under
          the ARCO Executive Deferral Plan (as in effect at the Effective Time)
          at the greater of (x) the interest rate credited under a comparable BP
          Amoco plan maintained in the United States for senior executives or
          (y) the "Citibank Base Rate," as defined in the ARCO Executive
          Deferral Plan; provided, however, that for the period ending upon
                         --------  -------
          completion of ten full plan years after the Effective Time, such rate
          shall be no less than 125% of the 120-month rolling average of the 10-
          year U.S. Treasury Note rate for each applicable 120-month period
          ending June 30 (determined in a manner consistent with past practice),
          such rate to be effective for the immediately following plan year,
          except that the minimum rate shall be the Citibank Base Rate in those
          limited circumstances in which it is determined by ARCO management, in
          its sole discretion pursuant to a formal action taken prior to the
          Effective Time, that any participant has failed to satisfactorily
          perform his/her duties consistent with pre-established goals
          previously communicated to the participant and such failure to so
          perform has not otherwise been excused by ARCO management; and (iii)
          the ARCO outplacement policies and, for executives, financial
          counseling policies, as in effect as of the date hereof, to be
          maintained for two years following the Effective Time.

               III.8.1.4.  Following the Effective Time, BP Amoco shall, and
          shall cause its Subsidiaries to, recognize service with ARCO and its
          Subsidiaries and any predecessor entities (and any other service
          credited by ARCO under similar benefit plans), prior to the Effective
          Time for all purposes (including, without limitation, eligibility to
          participate, vesting, benefit accrual, eligibility to commence
          benefits and severance) under any benefit plans of BP Amoco or its
          Subsidiaries in which the particular employee or former employee of
          ARCO (or its respective Subsidiaries) participates to the same extent
          as if such service had been rendered to BP Amoco or any of its
          Subsidiaries; provided however, that the foregoing shall not result in
                        -------- -------
          any duplication of benefits for the same period of service.  From and
          after the Effective Time, BP Amoco shall, and shall cause its
          Subsidiaries to, recognize any and all appropriate out-of-pocket

                                      -47-
<PAGE>

          expenses of each employee or former employee of ARCO and its
          Subsidiaries for purposes of determining such employee's and former
          employee's (including their beneficiaries and dependents) deductible
          and co-payment expenses under BP Amoco's medical benefit plans.  BP
          Amoco shall waive, or cause to be waived, any pre-existing condition
          limitation under any welfare benefit plan maintained by BP Amoco or
          any of its Subsidiaries in which employees of ARCO and its
          Subsidiaries (and their respective eligible dependents) will be
          eligible to participate on or following the Effective Time to the
          extent such pre-existing condition limitation was waived or satisfied
          under the comparable ARCO plan.

               III.8.1.5.  From and after the Effective Time, BP Amoco shall
          honor, fulfill and discharge, and shall cause its Subsidiaries to
          honor, fulfill and discharge, in accordance with its terms, each
          existing employment, change of control, severance and termination
          agreement between ARCO or any of its Subsidiaries, and any officer,
          director or employee of such company, including without limitation (i)
          all legal and contractual obligations pursuant to outstanding
          retirement plans, including the extension of the Enhanced Retirement
          Program, pursuant to Section 3.1.2.4(i), salary and bonus deferral
          plans, vested and accrued benefits and similar employment and benefit
          arrangements and agreements in effect as of the Effective Time,
          including all the "change of control" provisions under the plans,
          programs, policies and agreements listed in Section 3.8.1.5 of the
          ARCO Disclosure Letter, and (ii) all vacation, personal and sick days
          accrued by employees of ARCO and its Subsidiaries as of the Effective
          Time. BP Amoco acknowledges that the consummation of the Merger will
          constitute a "change of control" as respectively defined under the
          plans, programs, policies and agreements listed in Section 3.8.1.5 of
          the ARCO Disclosure Letter.

               III.8.1.6.  From and after the Effective Time, BP Amoco shall
          recognize, and cooperate in good faith with, the Independent Plan
          Administrator (the "IPA") of the ARCO Supplemental Executive Benefit
                              ---
          Plans Trust Agreement; provided, however, that BP Amoco agrees to
                                 --------  -------
          cooperate with ARCO and the IPA in an effort to effect the transfer
          and/or assumptions of any plan, or portion thereof, under the
          administration of ARCO or the IPA to any successor plan or trust, as
          may be requested by ARCO or the IPA.



                                      -48-
<PAGE>

               III.8.2.  Director and Officer Liability.
                         ------------------------------

               III.8.2.1. BP Amoco agrees that all rights to indemnification and
          all limitations on liability existing in favor of any Indemnitee (as
          defined below) in respect of acts or omissions of such Indemnitees on
          or prior to the Effective Time as provided in the restated certificate
          of incorporation and by-laws of ARCO or an agreement between an
          Indemnitee and ARCO or its Subsidiaries in effect as of the date
          hereof shall continue in full force and effect in accordance with the
          terms thereof.

               III.8.2.2. For six years after the Effective Time, BP Amoco shall
          indemnify and hold harmless the individuals who on or prior to the
          Effective Time were officers or directors of ARCO or any of its
          Subsidiaries (the "Indemnitees") (i) with respect to all acts or
                             -----------
          omissions by them in their capacities as officers or directors of ARCO
          in connection with the approval of this Agreement and the transactions
          contemplated hereby and (ii) to the same extent indemnified as set
          forth in Section 3.8.2.1, with respect to all other actions or
          omissions by them in their capacities as officers or directors of
          ARCO, or taken by them at the request of, ARCO or any of its
          Subsidiaries.  In the event any claim in respect of which
          indemnification is available pursuant to the foregoing provisions is
          asserted or made within such six-year period, all rights to
          indemnification shall continue until such claim is disposed of or all
          judgments, orders, decrees or other rulings in connection with such
          claim are duly satisfied.

               III.8.2.3. For six years after the Effective Time, BP Amoco shall
          procure the provision of directors' and officers' liability insurance
          in respect of acts or omissions occurring prior to the Effective Time
          covering each such Person currently covered by ARCO's directors' and
          officers' liability insurance policy on terms set forth in the BP
          Amoco Disclosure Letter.  Such liability insurance procured by BP
          Amoco may provide "first dollar" coverage, without any requirement to
          first seek indemnification from the Surviving Corporation or BP Amoco.

               III.8.2.4. The obligations of BP Amoco under this Section 3.8.2
          shall not be terminated or modified in such a manner as to adversely
          affect any Indemnitee to whom this Section 3.8.2 applies without the
          consent of such affected Indemnitee (it being expressly agreed that
          the Indemnitees to whom this Section 3.8.2 applies shall be third
          party beneficiaries of this Section 3.8.2).

                                      -49-
<PAGE>

          III.9.  Expenses.  Except as otherwise provided in Section 5.5,
                  --------
whether or not the Merger is consummated, all costs and expenses incurred in
connection with this Agreement, the Stock Option Agreement, the Merger and the
other transactions contemplated by this Agreement and the Stock Option Agreement
shall be paid by the party incurring such expense, except that the parties shall
share equally the costs and expenses of filing, printing and distributing the
Form F-4, the ARCO Proxy Statement, the BP Amoco Documents and related
documents.

          III.10.  Takeover Statutes.  If any Takeover Statute is or may
                   -----------------
become applicable to the Merger or the other transactions contemplated by this
Agreement and the Stock Option Agreement, each of BP Amoco and ARCO and its
board of directors shall, subject to applicable Law, grant such approvals and
take such actions as are necessary so that the Merger and the other transactions
contemplated by this Agreement and the Stock Option Agreement may be consummated
as promptly as practicable on the terms contemplated by this Agreement and the
Stock Option Agreement, and otherwise act to eliminate or minimize the effects
of such Takeover Statute on such transactions.

          III.11.  Dividends.  At least until December 31, 2003, dividends on
                   ---------
the BP Amoco Ordinary Shares will be announced in U.S. dollars and paid to
holders of BP Amoco Depositary Shares in U.S. dollars and to holders of BP Amoco
Ordinary Shares in pounds sterling.  ARCO agrees that it will coordinate its
record dates for dividends on ARCO Common Shares with BP Amoco's record dates
for dividends on BP Amoco Ordinary Shares so that record dates with respect to
dividends to which holders of ARCO Common Shares will be entitled, whether
declared with respect to ARCO Common Shares or, after the Effective Time, with
respect to BP Amoco Ordinary Shares, do not occur more or less frequently than
once each calendar quarter.

          III.12.  Listing Applications.  BP Amoco shall promptly prepare and
                   --------------------
submit to the LSE a listing application with respect to the BP Amoco Ordinary
Shares issuable in the Merger, and to each of the NYSE and Pacific Exchange a
listing application in respect of the BP Amoco Depositary Shares issuable in the
Merger and in the DSC II Share Exchange, and shall use its best efforts to
obtain, prior to the Effective Time, approval for the listing of such BP Amoco
Ordinary Shares, in the case of the LSE, subject to allotment, and such BP Amoco
Depositary Shares, in the case of the NYSE, subject to official notice of
issuance.  After the Closing, BP Amoco shall take any action that may be
required under applicable Laws, including, if necessary, the submission of
additional listing applications, as and when required, to provide for the
listing (i) on the London Stock Exchange of all BP Amoco Ordinary Shares and
(ii) on the NYSE of all BP Amoco Depositary Shares, in each case that may be
issued after the Effective Time in

                                      -50-
<PAGE>

respect of ARCO Stock Options or otherwise under any ARCO Stock Plan (or any
successor thereto).

          III.13.  Letters of Accountants.
                   ----------------------

          III.13.1.  BP Amoco shall use its best reasonable efforts to cause to
     be delivered to ARCO "comfort" letters of Ernst & Young, BP Amoco's
     independent public accountants, dated the effective date of the Form F-4
     and the Closing Date, respectively, and addressed to ARCO and its
     directors, in form reasonably satisfactory to ARCO and customary in scope
     and substance for "comfort" letters delivered by independent public
     accountants in connection with registration statements similar to the Form
     F-4.

          III.13.2.  ARCO shall use its best reasonable efforts to cause to be
     delivered to BP Amoco "comfort" letters of PricewaterhouseCoopers, ARCO's
     independent public accountants, dated the effective date of the Form F-4
     and the Closing Date, respectively, and addressed to BP Amoco and its
     directors, in form reasonably satisfactory to BP Amoco and customary in
     scope and substance for "comfort" letters delivered by independent public
     accountants in connection with registration statements similar to the Form
     F-4.

          III.14.  Agreements of ARCO Affiliates.  Prior to the date of the
                   -----------------------------
ARCO Stockholders Meeting, ARCO shall cause to be prepared and delivered to BP
Amoco a list identifying all persons who, at the time of the ARCO Stockholders
Meeting, ARCO believes may be deemed to be "affiliates" of ARCO for purposes of
Rule 145 under the Securities Act (the "ARCO Affiliates").  BP Amoco shall be
                                        ---------------
entitled to place restrictive legends on any BP Amoco ADRs (or any underlying BP
Amoco Ordinary Shares that may be withdrawn upon surrender of such BP Amoco
ADRs) received by such ARCO Affiliates.  ARCO shall use its best efforts to
cause each person who is identified as an ARCO Affiliate in such list to deliver
to BP Amoco, at or prior to the Effective Time, a written agreement, in the form
to be approved by the Parties, that such ARCO Affiliate will not sell, pledge,
transfer or otherwise dispose of any BP Amoco Depositary Shares or BP Amoco
Ordinary Shares issued to such ARCO Affiliate pursuant to the Merger (or any
underlying BP Amoco Ordinary Shares that may be withdrawn upon surrender of such
BP Amoco Depositary Shares), except pursuant to an effective registration
statement or in compliance with Rule 145 or an exemption from the registration
requirements of the Securities Act.  BP Amoco shall not register the transfer of
any BP Amoco Ordinary Shares  and shall cause the Depositary not to register the
transfer of any BP Amoco Depositary Shares unless such transfer is made in
compliance with the foregoing.

                                      -51-
<PAGE>

          III.15.  Accounting Matters.  At least until December 31, 2003, BP
                   ------------------
Amoco shall include as supplemental disclosure in its consolidated financial
statements a reconciliation of its consolidated net income and shareholders'
equity to U.S. GAAP.

          III.16.  Tax Matters.  BP Amoco shall timely satisfy, or cause to be
                   -----------
timely satisfied, all applicable tax reporting and filing requirements contained
in the Code with respect to the transactions contemplated hereby, including,
without limitation, the reporting requirements contained in the United States
Treasury Regulation Section 1.367(a)-3(c)(6).

          III.17.  Vastar.  Notwithstanding anything to the contrary in this
                   ------
Article III, if any action is taken by Vastar or any of its Subsidiaries, or
Vastar or any of its Subsidiaries fails to take any action, that would (but for
this Section 3.17) constitute a violation by ARCO of a provision of this Article
III, ARCO shall be deemed to be in compliance with, and deemed not in violation
of, such provision if ARCO has used reasonable efforts, consistent with the
fiduciary duties of the Vastar directors designated by ARCO, to prevent such
action or such failure to take action, as the case may be, on the part of Vastar
and its Subsidiaries.  For the purposes of Section 3.1.2.3, transactions by
Vastar and its Subsidiaries shall not count toward the monetary amounts set
forth therein.

          III.18.  Section 103.  BP Amoco shall, if and to the extent
                   -----------
required, comply with its obligations under Section 103 of the U.K. Companies
Act 1985 in respect of the Merger Consideration.

                                  ARTICLE IV

                                  Conditions

          IV.1.  Conditions to Each Party's Obligation to Effect the Merger'.
                 -----------------------------------------------------------
The respective obligations of BP Amoco, Merger Sub and ARCO to effect the Merger
are subject to the satisfaction or waiver of each of the following conditions:

          IV.1.1.  Shareholder Approvals.  This Agreement shall have been duly
                   ---------------------
     adopted by holders of ARCO Common Shares constituting the ARCO Requisite
     Vote, and the Merger shall have been duly approved by the shareholders of
     BP Amoco constituting the BP Amoco Requisite Vote.

          IV.1.2.  Regulatory Consents.  All BP Amoco Required Consents and
                   -------------------
     ARCO Required Consents from or with any Governmental Entity (collectively,
     "Governmental Consents") in connection with the consummation of the Merger
      ---------------------
     and the other transactions contemplated hereby shall have been made or
     obtained,

                                      -52-
<PAGE>

     except where the failure to obtain such Governmental Consent would not,
     individually or in the aggregate, reasonably be expected to have a Material
     Adverse Effect on BP Amoco or ARCO after the Effective Time, and such
     Governmental Consents shall not contain any terms or impose any conditions,
     terms or restrictions in connection with any such Governmental Consent
     which, individually or in the aggregate, would be reasonably likely to have
     a Material Adverse Effect on BP Amoco or ARCO after the Effective Time (it
     being understood that, for this purpose, materiality shall be considered
     solely with respect to the total value of the U.S. operations of BP Amoco,
     ARCO and their Subsidiaries, taken together.

          IV.1.3.  Laws and Orders.  No Governmental Entity of competent
                   ---------------
     jurisdiction shall have enacted, issued, promulgated, enforced or entered
     any Law (whether temporary, preliminary or permanent) that is in effect and
     restrains, enjoins or otherwise prohibits the consummation of the Merger or
     the other transactions contemplated by this Agreement and that,
     individually or in the aggregate with all other such Laws, is reasonably
     likely to have a Material Adverse Effect on BP Amoco or ARCO or that would
     materially impair the ability of BP Amoco to consummate the Merger
     (collectively, an "Order").  The enactment, issuance, promulgation,
                        -----
     enforcement or execution by any Governmental Entity of any Order with
     respect to a Governmental Consent shall not result in a failure of the
     conditions set forth in this Section 4.1.3 if such Order imposes on BP
     Amoco or ARCO or their respective Subsidiaries conditions, terms or
     restrictions with respect to or upon the consummation of the Merger and
     such conditions, terms or restrictions, if contained solely in a
     Governmental Consent, would not result in the failure of the condition set
     forth in Section 4.1.2.

          IV.1.4.  Effectiveness of Form F-4.  The Form F-4 shall have become
                   -------------------------
     effective prior to the mailing of the ARCO Proxy Statement to its
     stockholders, no stop order suspending the effectiveness of the Form F-4
     shall then be in effect, and no proceedings for that purpose shall then be
     threatened by the SEC or shall have been initiated by the SEC and not
     concluded or withdrawn.

          IV.1.5.  Exchange Listings.  The LSE shall have granted permission
                   -----------------
     for admission to the Official List of the LSE, subject to allotment, of the
     BP Amoco Ordinary Shares to be issued pursuant to the Merger, and such
     permission shall not have been withdrawn prior to the Effective Time, and
     the BP Amoco Depositary Shares shall have been authorized for listing on
     the NYSE, subject to official notice of issuance.

                                      -53-
<PAGE>

          IV.2.  Conditions to Obligations of BP Amoco and Merger Sub.  The
                 ----------------------------------------------------
obligations of BP Amoco and Merger Sub to effect the Merger is also subject to
the satisfaction or waiver by BP Amoco and Merger Sub prior to the Effective
Time of the following conditions:

          IV.2.1.  Representations and Warranties of ARCO.  The
                   --------------------------------------
     representations and warranties of ARCO set forth in this Agreement (i) to
     the extent qualified by Material Adverse Effect or any other materiality
     qualification shall be true and correct and (ii) to the extent not
     qualified by Material Adverse Effect or any other materiality qualification
     shall be true and correct, in each case when made and as of the Closing
     Date as though made on and as of the Closing Date (except as provided in
     Section 2.2 and except that any representation or warranty that by its
     terms expressly speaks as of an earlier date shall be true and correct as
     of such date) (provided that this clause (ii) shall be deemed satisfied so
     long as any failures of such representations and warranties to be true and
     correct, taken together, would not, individually or in the aggregate,
     reasonably be expected to have a Material Adverse Effect on ARCO), and BP
     Amoco shall have received a certificate signed on behalf of ARCO by an
     executive officer of ARCO to such effect.

          IV.2.2.  Performance of Obligations of ARCO.  ARCO shall have
                   ----------------------------------
     performed all material obligations required to be performed by it under
     this Agreement at or prior to the Closing Date, and BP Amoco shall have
     received a certificate signed on behalf of ARCO by an executive officer of
     ARCO to such effect.

          IV.3.  Conditions to Obligation of ARCO.  The obligation of ARCO to
                 --------------------------------
effect the Merger is also subject to the satisfaction or waiver by ARCO prior to
the Effective Time of the following conditions:

          IV.3.1.  Representations and Warranties. The representations and
                   ------------------------------
     warranties of BP Amoco and Merger Sub set forth in this Agreement (i) to
     the extent qualified by Material Adverse Effect or any other materiality
     qualification shall be true and correct and (ii) to the extent not
     qualified by Material Adverse Effect or any other materiality qualification
     shall be true and correct, in each case when made and as of the Closing
     Date as though made on and as of the Closing Date (except that any
     representation or warranty that by its terms expressly speaks as of an
     earlier date shall be true and correct as of such date) (provided that this
     clause (ii) shall be deemed satisfied so long as any failures of such
     representations and warranties to be true and correct, taken together,
     would not, individually or in the aggregate, reasonably be expected to have
     a Material Adverse Effect on BP

                                      -54-
<PAGE>

     Amoco), and ARCO shall have received a certificate signed on behalf of BP
     Amoco by an executive officer of BP Amoco to such effect.

          IV.3.2.  Performance of Obligations of BP Amoco.  BP Amoco shall
                   --------------------------------------
     have performed all material obligations required to be performed by it
     under this Agreement at or prior to the Closing Date, and ARCO shall have
     received a certificate signed on behalf of BP Amoco by an executive officer
     of BP Amoco to such effect.

          IV.3.3.  Tax Opinion.  ARCO shall have received an opinion from
                   -----------
     Cravath, Swaine & Moore, dated as of the Effective Time, substantially to
     the effect that, on the basis of the facts, representations and assumptions
     set forth in such opinion, the Merger will be treated for U.S. federal
     income tax purposes as a reorganization within the meaning of Section
     368(a) of the Code and that no gain or loss will be recognized by the
     stockholders of ARCO who exchange ARCO Common Shares solely for BP Amoco
     Shares pursuant to the Merger (except with respect to (i) cash received in
     lieu of fractional interests in BP Amoco Depositary Shares or (ii)
     stockholders of ARCO who are not Eligible ARCO Shareholders).  In rendering
     such opinion, counsel may require and rely upon representation letters of
     BP Amoco and ARCO substantially in the form set forth as Exhibits B and C
     hereto, respectively.


                                   ARTICLE V

                                  Termination

          V.1.  Termination by Mutual Consent.  This Agreement may be
                -----------------------------
terminated and the Merger may be abandoned at any time prior to the Effective
Time, whether before or after the approval by shareholders of BP Amoco and the
stockholders of ARCO referred to in Section 4.1.1, by mutual written consent of
BP Amoco and ARCO, by action of their respective boards of directors.

          V.2.  Termination by Either BP Amoco or ARCO.  This Agreement may be
                --------------------------------------
terminated and the Merger may be abandoned at any time prior to the Effective
Time by action of the board of directors of either BP Amoco or ARCO if (i) the
Merger shall not have been consummated by March 31, 2000, whether such date is
before or after the approvals by the shareholders of BP Amoco and the
stockholders of ARCO (subject to extension as provided below, the "Termination
                                                                   -----------
Date"), (ii) any Order permanently restraining, enjoining or otherwise
- ----
prohibiting the consummation of the Merger shall have become final and non-
appealable, whether before or after the approval by the shareholders of BP Amoco
or the stockholders of ARCO, (iii) this Agreement shall not

                                      -55-
<PAGE>

have been adopted by holders of ARCO Common Shares constituting the ARCO
Requisite Vote at the duly held ARCO Stockholders Meeting, including any
adjournment or postponement thereof or (iv) the Merger shall not have been
approved by shareholders of BP Amoco constituting the BP Amoco Requisite Vote at
the duly held BP Amoco Shareholders Meeting, including any adjournment or
postponement thereof; provided that the right to terminate this Agreement
                      --------
pursuant to this Section 5.2 shall not be available to a Party that has breached
in any material respect its obligations under Section 3.5 or any of its other
obligations under this Agreement in any manner that shall have proximately
contributed to the failure of the Merger to be consummated; provided, further,
                                                            --------  -------
that, if a condition set forth in Section 4.1.2 or 4.1.3 remains unsatisfied and
shall not have been waived by each of the parties hereto on or prior to the
Termination Date, either ARCO or BP Amoco may extend the Termination Date to
June 30, 2000. The party electing pursuant to the foregoing proviso to extend
the Termination Date shall deliver written notice to such effect to the other
party on or before March 31, 2000, whereupon such extension shall be effective
from and after April 1, 2000, and this Agreement may not be terminated and the
Merger abandoned pursuant to Section 5.2(i) until after such extended
Termination Date.

          V.3.  Termination by BP Amoco.  This Agreement may be terminated and
                -----------------------
the Merger may be abandoned at any time prior to the Effective Time, whether
before or after the approval by the shareholders of BP Amoco referred to in
Section 4.1.1, by action of the board of directors of BP Amoco, if (i) the board
of directors of ARCO shall have withdrawn its approval or favorable
recommendation to stockholders of this Agreement; or (ii) ARCO or its board of
directors shall take any of the actions described in clause (ii) or clause (iii)
of the proviso to Section 3.2.1; or (iii) there shall be a breach by ARCO of any
representation, warranty, covenant or agreement contained in this Agreement
which would result in a failure of a condition set forth in Section 4.2.1 or
4.2.2 and cannot be or is not cured prior to the Termination Date.

          V.4.  Termination by ARCO.  This Agreement may be terminated and the
                -------------------
Merger may be abandoned at any time prior to the Effective Time, whether before
or after the approval by stockholders of ARCO referred to in Section 4.1.1, by
action of the board of directors of ARCO, if (i) the board of directors of BP
Amoco shall have withdrawn its approval or favorable recommendation to
shareholders of the Merger or (ii) the board of directors of ARCO becomes
entitled pursuant to Section 3.2.1 to recommend an ARCO Acquisition Proposal to
its stockholders and, (A) at the time of such termination pursuant to this
clause (ii), ARCO is in compliance with Section 3.2.1, (B) ARCO first pays to BP
Amoco the ARCO Termination Amount and any amounts due to BP Amoco under the
Stock Option Agreement and (C) ARCO concurrently enters into a definitive
agreement to implement such ARCO Acquisition Proposal, or (iii) there shall be a
breach by BP Amoco of any representation, warranty, covenant or agreement

                                      -56-
<PAGE>

contained in this Agreement which would result in a failure of a condition set
forth in Section 4.3.1 or 4.3.2 and cannot be or is not cured prior to the
Termination Date.

          V.5.  Effect of Termination and Abandonment.
                -------------------------------------

          V.5.1.  In the event of termination of this Agreement and the
     abandonment of the Merger pursuant to this Article V, this Agreement (other
     than as set forth in Section 6.1) shall become void and of no effect with
     no liability on the part of either Party (or of any of its
     Representatives); provided, however, that no such termination shall relieve
                       --------  -------
     either Party of any liability for damages resulting from any willful breach
     of this Agreement or from any obligation to pay, if applicable, the amounts
     payable pursuant to Section 5.5.2 or 5.5.3.

          V.5.2.  In the event that (i) this Agreement is terminated by either
     BP Amoco or ARCO pursuant to Section 5.2(iii) and at the time of the ARCO
     Stockholders Meeting (or at any adjournment thereof) an ARCO Acquisition
     Proposal exists or (ii) (A) this Agreement is terminated by either BP Amoco
     or ARCO pursuant to Section 5.2(iii) and prior to such termination ARCO's
     board of directors shall have withdrawn its approval or favorable
     recommendation to its stockholders of this Agreement, (B) this Agreement is
     terminated by BP Amoco pursuant to Section 5.3(i), Section 5.3(ii) (solely
     with respect to the recommendation by ARCO or the board of directors of
     ARCO of an ARCO Acquisition Proposal) or Section 5.3(iii) (solely with
     respect to a willful breach of Section 3.2), or (C) this Agreement is
     terminated by ARCO in accordance with Section 5.4(ii), then ARCO shall
     promptly, but in no event later than two business days after the date of
     such termination or, in the case of termination pursuant to Section
     5.4(ii), at the time provided therein, pay to BP Amoco as compensation for
     the Merger not becoming effective a termination payment equal to the ARCO
     Termination Amount (as defined below), which amount shall be exclusive of
     any expenses to be paid pursuant to Section 3.9, payable by wire transfer
     of same day funds.  The term "ARCO Termination Amount" shall mean, in the
                                   -----------------------
     case of termination by BP Amoco pursuant to clause (ii) of the preceding
     sentence, $450,000,000 (inclusive of value added tax, if any) or, in the
     case of termination by BP Amoco or ARCO pursuant to clause (i) of the
     preceding sentence, "ARCO Termination Amount" shall mean $250,000,000
     (inclusive of value added tax, if any), plus, if (x) ARCO executes and
                                             ----
     delivers an agreement with respect to any ARCO Acquisition Proposal (an
     "ARCO Alternative Agreement") or (y) an ARCO Acquisition Proposal with
     ---------------------------
     respect to ARCO is consummated, in any such case, within 12 months from the
     date of termination, an additional $200,000,000  (inclusive of value added
     tax, if any) (which additional amount shall be paid promptly by wire
     transfer in same day funds, and in no event later than two

                                      -57-
<PAGE>

     business days after the earliest date on which the event requiring ARCO to
     pay such additional sum occurs). In the event that the board of directors
     of ARCO recommends the acceptance by ARCO stockholders of a third-party
     tender or exchange offer for the ARCO Common Shares, such recommendation
     shall be treated for purposes of this Section as though an ARCO Alternative
     Agreement had been executed. ARCO acknowledges that the agreements
     contained in this Section 5.5.2 are an integral part of the transactions
     contemplated by this Agreement, and that, without these agreements, BP
     Amoco would not enter into this Agreement; accordingly, if ARCO fails
     promptly to pay any amount due pursuant to this Section 5.5.2, and, in
     order to obtain such payment, BP Amoco commences a suit which results in a
     judgment against ARCO for the payment set forth in this Section 5.5.2, ARCO
     shall pay to BP Amoco its costs and expenses (including attorneys' fees) in
     connection with such suit, together with interest on the ARCO Termination
     Amount from each date for payment until the date of such payment at the
     prime rate of Citibank N.A. in effect on the date such payment was required
     to be made plus 2 percent.

          V.5.3.  In the event that this Agreement is terminated (i) by ARCO
     pursuant to Section 5.4(i) or (ii) by either BP Amoco or ARCO pursuant to
     Section 5.2(iv) and prior to such termination BP Amoco's board of directors
     shall have withdrawn its approval or favorable recommendation to
     shareholders of the Merger, then BP Amoco shall promptly, but in no event
     later than two business days after the date of such termination, pay to
     ARCO a termination payment equal to the BP Amoco Termination Amount (as
     defined below), which amount shall be exclusive of any expenses to be paid
     pursuant to Section 3.9 payable by wire transfer of same day funds.  The
     term "BP Amoco Termination Amount" shall mean $500,000,000  (inclusive of
           ---------------------------
     value added tax, if any).  BP Amoco acknowledges that the agreements
     contained in this Section 5.5.3 are an integral part of the transactions
     contemplated by this Agreement, and that, without these agreements, ARCO
     would not enter into this Agreement; accordingly, if BP Amoco fails
     promptly to pay any amount due pursuant to this Section 5.5.3, and, in
     order to obtain such payment, ARCO commences a suit which results in a
     judgment against BP Amoco for the payment set forth in this Section 5.5.3,
     BP Amoco shall pay to ARCO its costs and expenses (including attorneys'
     fees) in connection with such suit, together with interest on the BP Amoco
     Termination Amount from each date for payment until the date of such
     payment at the prime rate of Citibank N.A. in effect on the date such
     payment was required to be made plus 2 percent.


                                  ARTICLE VI

                                      -58-
<PAGE>

                           Miscellaneous and General

          VI.1.  Survival.  This Article VI and the agreements of BP Amoco and
                 --------
ARCO contained in Article I, Sections 3.8 (Benefits and Other Matters), 3.15
(Accounting Matters) and Section 3.16 (Tax Matters) shall survive the Effective
Time.  This Article VI, the representations and warranties contained in Section
2.1.3 (Corporate Authority; Approval and Fairness), the agreements of BP Amoco
and ARCO contained in Section 3.7 (Publicity), Section 3.9 (Expenses), Section
5.5 (Effect of Termination and Abandonment), and the last sentence of Section
3.6 (Access) shall survive the termination of this Agreement.  All other
representations, warranties, agreements and covenants in this Agreement shall
not survive the Effective Time or the termination of this Agreement.

          VI.2.  Modification or Amendment.  This Agreement may be modified or
                 -------------------------
amended by agreement of the Parties, by action taken or authorized by their
respective boards of directors, at any time prior to the Effective Time;

provided, however, that, after approval by ARCO stockholders of the matters
- --------  -------
presented at the ARCO Stockholders Meeting, no modification or amendment shall
be made which under applicable Law requires further approval by such
stockholders without such further approval.  This Agreement may not be modified
or amended except by an instrument in writing executed and delivered by duly
authorized officers of each of the Parties.

          VI.3.  Waiver.  Any provision of this Agreement may be waived prior
                 ------
to the Effective Time if, and only if, such waiver is in writing and signed by
the Party against whom the waiver is to be effective.

          VI.4.  Failure or Indulgence Not Waiver; Remedies Cumulative.  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.  Except as otherwise herein provided,
the rights and remedies herein provided shall be cumulative and not exclusive of
any rights or remedies provided by Law.

          VI.5.  Counterparts.  This Agreement may be executed in any number
                 ------------
of counterparts, each such counterpart being deemed to be an original
instrument, and all such counterparts shall together constitute the same
agreement.

          VI.6.  GOVERNING LAW AND VENUE; WAIVER OF JURY TRIAL.
                 ---------------------------------------------

          VI.6.1.  THIS AGREEMENT SHALL BE DEEMED TO BE MADE IN, AND IN ALL
     RESPECTS SHALL BE INTERPRETED, CONSTRUED

                                      -59-
<PAGE>

     AND GOVERNED BY AND IN ACCORDANCE WITH THE LAWS OF THE STATE OF DELAWARE
     APPLICABLE TO CONTRACTS TO BE PERFORMED WHOLLY IN SUCH STATE, EXCEPT TO THE
     EXTENT THAT IN THE CASE OF BP AMOCO, THE COMPANIES ACT AND ENGLISH LAW ARE
     APPLICABLE. The Parties hereby irrevocably submit to the jurisdiction of
     the federal courts of the United States of America located in the State of
     Delaware and the state courts of the State of Delaware, solely in respect
     of the interpretation and enforcement of the provisions of this Agreement
     and in respect of the transactions contemplated hereby and hereby waive,
     and agree not to assert, as a defense in any action, suit or proceeding for
     the interpretation or enforcement hereof, that it is not subject thereto or
     that such action, suit or proceeding may not be brought or is not
     maintainable in said courts or that the venue thereof may not be
     appropriate or that this Agreement may not be enforced in or by such
     courts, and the Parties irrevocably agree that all claims with respect to
     such action or proceeding shall be heard and determined in such a court.
     The Parties hereby consent to and grant any such court jurisdiction over
     the person of such Parties and over the subject matter of such dispute and
     agree that mailing of process or other papers in connection with any such
     action or proceeding in the manner provided in Section 6.7, or in such
     other manner as may be permitted by Law, shall be valid and sufficient
     service thereof.

          VI.6.2.  EACH PARTY ACKNOWLEDGES AND AGREES THAT ANY CONTROVERSY WHICH
     MAY ARISE UNDER THIS AGREEMENT IS LIKELY TO INVOLVE COMPLICATED AND
     DIFFICULT ISSUES, AND THEREFORE EACH SUCH PARTY HEREBY IRREVOCABLY AND
     UNCONDITIONALLY WAIVES ANY RIGHT SUCH PARTY MAY HAVE TO A TRIAL BY JURY IN
     RESPECT OF ANY LITIGATION DIRECTLY OR INDIRECTLY ARISING OUT OF OR RELATING
     TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED BY THIS AGREEMENT.  EACH
     PARTY CERTIFIES AND ACKNOWLEDGES THAT (i) NO REPRESENTATIVE, AGENT OR
     ATTORNEY OF ANY OTHER PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT
     SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE
     FOREGOING WAIVER, (ii) EACH SUCH PARTY UNDERSTANDS AND WITH THE ADVICE OF
     COUNSEL HAS CONSIDERED THE IMPLICATIONS OF THIS WAIVER, (iii) EACH SUCH
     PARTY MAKES THIS WAIVER VOLUNTARILY, AND (iv) EACH SUCH PARTY HAS BEEN
     INDUCED TO ENTER INTO THIS AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL
     WAIVERS AND CERTIFICATIONS IN THIS SECTION 6.6.

                                      -60-
<PAGE>

          VI.7.  Notices.  Notices, requests, instructions or other documents
                 -------
to be given under this Agreement shall be in writing and shall be deemed given,
(i) when sent if sent by facsimile, provided that the facsimile is promptly
confirmed by telephone confirmation thereof,  (ii) when delivered, if delivered
personally to the intended recipient, and (iii) one business day later, if sent
by overnight delivery via a national courier service, and in each case,
addressed to a Party at the following address for such Party:

          if to ARCO:
          ----------

          ARCO

          Atlantic Richfield Company
          333 South Hope Street
          Los Angeles, California  90071
          Attention:   Bruce Whitmore, Esq.
          Telecopier:  213-486-1818

          with copies to

          Cravath, Swaine & Moore
          Worldwide Plaza
          825 Eighth Avenue
          New York, New York  10019
          Attention:   Richard Hall, Esq.
          Telecopier:  (212) 474-3700

          and

          Clifford Chance
          200 Aldersgate Street
          London EC1A 4JJ
          England
          Attention:   Adam Signy, Esq.
          Telecopier:  44-171-600-5555

                                      -61-
<PAGE>

          if to BP Amoco or Merger Sub:

          BP Amoco p.l.c.
          Brittanic House
          1 Finsbury Circus
          London EC2M 7BA
          England
          Attention:   Peter B.P. Bevan, Esq.
                       General Counsel
          Telecopier: 44-171-496-4592

          with copies to

          Sullivan & Cromwell
          125 Broad Street
          New York, New York  10004
          Attention:   Benjamin F. Stapleton, Esq.
          Telecopier:  (212) 558-3588

          and

          Linklaters & Paines
          One Silk Street
          London EC2Y 8HQ
          Attention:   David Cheyne, Esq.
          Telecopier:  011-44-171-456-2222

or to such other Persons or addresses as may be designated in writing by the
Party to receive such notice as provided above.

          VI.8.  Entire Agreement.  This Agreement (including any exhibits
                 ----------------
hereto), the Stock Option Agreement, the Share Exchange Agreement and the
Confidentiality Agreement constitute the entire agreement, and supersede all
other prior agreements, understandings, representations and warranties both
written and oral, between the Parties with respect to the subject matter hereof.
References herein to this Agreement shall for all purposes be deemed to include
references to the BP Amoco Disclosure Letter and the ARCO Disclosure Letter.
Except as set forth in Sections 1.3, 1.5 and 3.8 (except for the provisions of
Section 3.8.1.1 and 3.8.1.2), this Agreement is not intended to confer upon any
Person other than the Parties any rights or remedies hereunder.  EACH PARTY
HERETO AGREES THAT, EXCEPT FOR THE

                                      -62-
<PAGE>

REPRESENTATIONS AND WARRANTIES CONTAINED IN THIS AGREEMENT, THE STOCK OPTION
AGREEMENT OR ANY OTHER AGREEMENT CONTEMPLATED HEREBY OR THEREBY, NONE OF BP
AMOCO, ARCO OR MERGER SUB MAKES ANY OTHER REPRESENTATIONS OR WARRANTIES, AND
EACH HEREBY DISCLAIMS ANY OTHER REPRESENTATIONS OR WARRANTIES MADE BY ITSELF OR
ANY OF ITS OFFICERS, DIRECTORS, EMPLOYEES, AGENTS, FINANCIAL AND LEGAL ADVISORS
OR OTHER REPRESENTATIVES WITH RESPECT TO THE EXECUTION AND DELIVERY OF THIS
AGREEMENT, THE STOCK OPTION AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY OR
THEREBY, NOTWITHSTANDING THE DELIVERY OR DISCLOSURE TO THE OTHER OR THE OTHER'S
REPRESENTATIVES OF ANY DOCUMENTATION OR OTHER INFORMATION WITH RESPECT TO ANY
ONE OR MORE OF THE FOREGOING.

          VI.9.  Obligations of BP Amoco and of ARCO.  Whenever this Agreement
                 -----------------------------------
requires a Subsidiary of BP Amoco to take any action, such requirement shall be
deemed to include an undertaking on the part of BP Amoco to use best reasonable
efforts to cause such Subsidiary to take such action. Subject to Section 3.17,
whenever this Agreement requires a Subsidiary of ARCO to take any action, such
requirement shall be deemed to include an undertaking on the part of ARCO to use
best reasonable efforts to cause such Subsidiary to take such action.

          VI.10.  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 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 unless the substitution of such provision would materially frustrate
the express intent and purposes of this Agreement, and (b) the remainder of this
Agreement and the application of such provision to other Persons 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.

          VI.11.  Interpretation.  The headings herein are for convenience of
                  --------------
reference only, do not constitute part of this Agreement and shall not be deemed
to limit or otherwise affect any of the provisions hereof.  Where a reference in
this Agreement is made to a Section or Exhibit, such reference shall be to a
Section of or Exhibit to this Agreement unless otherwise indicated.  Whenever
the words "include," "includes" or

                                      -63-
<PAGE>

"including" are used in this Agreement, they shall be deemed to be followed by
the words "without limitation."

          VI.12.  Assignment.  This Agreement shall not be assignable by
                  ----------
operation of law or otherwise, and any purported assignment in violation of this
provision shall be void.

                                      -64-
<PAGE>

          IN WITNESS WHEREOF, this Agreement has been duly executed and
delivered by the duly authorized officers of BP Amoco, ARCO and Merger Sub as of
the date hereof.


                         BP AMOCO p.l.c.

                         By:   /s/  John Browne
                             ------------------
                             Name:  (E.J.P. Browne) - Sir John Browne
                             Title:  Chief Executive Officer

                         By:   /s/  B.E. Grote
                             -----------------
                             Name:   B.E. Grote
                             Title:  Executive Vice President


                         ATLANTIC RICHFIELD COMPANY

                         By:    /s/  Mike R. Bowlin
                              ---------------------
                             Name:   Mike R. Bowlin
                             Title:  Chairman of the Board and
                                     Chief Executive Officer

                         PRAIRIE HOLDINGS, INC.

                         By:   /s/  Peter B.P. Bevan
                             -----------------------
                             Name:   P.B.P. Bevan
                             Title:  President

                                      -65-

<PAGE>
                                                                     Exhibit 2.1


                Amendment No. 1 to Agreement and Plan of Merger


          AMENDMENT NO. 1, dated as of July 12, 1999 (this "Amendment"), to the
                                                            ---------
Agreement and Plan of Merger, dated as of March 31, 1999 (the "Agreement"),
                                                               ---------
among BP AMOCO p.l.c., an English public limited company ("BP Amoco"), ATLANTIC
                                                           --------
RICHFIELD COMPANY, a Delaware corporation ("ARCO") and Prairie Holdings, Inc., a
                                            ----
Delaware corporation and direct wholly owned subsidiary of BP Amoco ("Merger
                                                                      ------
Sub").


                              W I T N E S S E T H:


          WHEREAS, BP Amoco, ARCO and Merger Sub desire to amend the Agreement;
and

          WHEREAS, Section 6.2 of the Agreement provides that, prior to approval
by the respective shareholders of ARCO and BP Amoco, the Agreement may be
modified or amended by agreement of the parties, by action taken or authorized
by their respective boards of directors prior to the Effective Time (as defined
in the Agreement) and by an instrument in writing executed and delivered by duly
authorized officers of each of the parties hereto; and

          WHEREAS, the respective Boards of BP Amoco, ARCO and Merger Sub have
approved this Amendment and authorized their duly authorized officers to execute
and deliver this Amendment;

          NOW, THEREFORE, in consideration of the mutual covenants and
agreements set forth herein, the parties hereto agree as follows:


                                   ARTICLE I
                          Amendments to the Agreement
                          ---------------------------

     1.1   The Agreement shall be amended to read in its entirety as set forth
in Appendix 1 hereto.
   ----------
<PAGE>

                                   ARTICLE II
                                 Miscellaneous
                                 -------------

     2.1   Definitions.  Capitalized terms used in this Amendment and not
           -----------
defined herein shall have the respective meanings ascribed to them in the
Agreement.

     2.2   Entire Agreement; Restatement.  Other than as amended by Section 1.1
           -----------------------------
above, the Agreement shall remain in full force and effect unaffected hereby.
Reference in the Agreement to "this Agreement," "herein" and "hereof" shall be
deemed to refer to the Agreement, as amended by this Amendment, and the parties
hereto hereby agree that the Agreement may be restated to reflect the amendments
provided for in this Amendment.

     2.3   Counterparts.  This Amendment may be executed in any number of
           ------------
counterparts, each such counterpart being deemed an original instrument, and all
such counterparts shall together constitute the same agreement.

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

                              BP AMOCO p.l.c.


                              By:___________________________
                                 Name:
                                 Title:


                              ATLANTIC RICHFIELD COMPANY


                              By:___________________________
                                 Name:
                                 Title:


                              PRAIRIE HOLDINGS, INC.
<PAGE>

                              By:___________________________
                                 Name:
                                 Title:

<PAGE>

                                                                    EXHIBIT 10.1

[LOGO OF ARCO]
- ----------------------------------------------------------------

ATLANTIC RICHFIELD
CAPITAL ACCUMULATION PLAN


Amendment and Restatement
Effective As Of March 15, 1999
<PAGE>

                          ATLANTIC RICHFIELD COMPANY.
                           CAPITAL ACCUMULATION PLAN
                               TABLE OF CONTENTS
                               -----------------
<TABLE>
<CAPTION>

                                                                               Page No.
                                                                               --------
INTRODUCTION......................................................................    1
<S>        <C>                                                                     <C>
Section 1 - DEFINITION
- ---------
            1.1   Acquisition Loan................................................    2
            1.2   Administrator...................................................    2
            1.3   Annual Earnings or Earnings.....................................    2
            1.4   Benefits Committee..............................................    2
            1.5   Capital Accumulation Plan Administrative Committee..............    2
            1.6   Code............................................................    2
            1.7   Company.........................................................    2
            1.8   Credited Company Service........................................    2
            1.9   Effective Date..................................................    2
            1.10   Elective Deferrals or Deferrals................................    3
            1.11   Employee.......................................................    3
            1.12   Employee Contribution Agreement................................    3
            1.13   ERISA..........................................................    3
            1.14   Financed Shares................................................    3
            1.15   Former Member..................................................    3
            1.16   Highly Compensated Employee....................................    3
            1.17   Hour of Service................................................    4
            1.18   Matching Contributions.........................................    5
            1.19   Member.........................................................    5
            1.20   Member's Account or Account....................................    5
            1.21   Member Contributions...........................................    6
            1.22   Plan or Plans..................................................    6
            1.23   Plan Year......................................................    6
            1.24   Subsidiary or Affiliate........................................    6
            1.25   Trust Agreement................................................    6
            1.26   Trustee........................................................    6
            1.27   Valuation Date.................................................    6

Section 2 - MEMBERSHIP - ELIGIBILITY
- ---------
            2.1   Membership......................................................    7
            2.2   Notice to Administrator.........................................    7
            2.3   Membership Termination..........................................    7
            2.4   Member Suspension...............................................    8
            2.5   Member Transfers................................................    8
            2.6   Capital Accumulation Plan Assets................................    8
</TABLE>

                                       i
<PAGE>

<TABLE>
<CAPTION>

Section 3 - MEMBERS' ELECTIVE DEFERRALS
- ---------
<S>       <C>   <C>                                                                <C>
            3.1   Members' Elections..............................................   10
            3.2   Contribution of Elective Deferrals and Member Contributions.....   11
            3.3   Annual Dollar Limitation........................................   11
            3.4   Actual Deferral Percentage Tests................................   12
            3.5   Distribution of Excess Contributions............................   12
            3.6   Make-Up Elective Deferrals and Member Contributions.............   13

Section 4 -  COMPANY CONTRIBUTION
- ---------
            4.1   Matching Contribution...........................................   14
            4.2   Form of Contribution............................................   14
            4.3   Members Excluded From Contribution..............................   14
            4.4   Actual Contribution Percentage Test.............................   14
            4.5   Distribution of Excess Contributions............................   15
            4.6   Limitation on the Multiple Use Alternative......................   16
            4.7   Section 415 Limitations.........................................   16
            4.8   Nonelective Contributions.......................................   17
            4.9   Exclusive Benefit...............................................   17

Section 5 - FINANCED SHARES
- ---------
            5.1   Acquisition Loans...............................................   18
            5.2   Payments on Acquisition Loan....................................   19

Section 6 - INVESTMENT OF MEMBERS' AND FORMER MEMBERS' ACCOUNTS
- ---------
            6.1   Members' and Former Members' Accounts...........................   21
            6.2   Investment of Elective Deferrals,Member Contribution, Rollovers
                  and Certain Matching Contributions..............................   21
            6.3   Investment of Company Contributions.............................   21
            6.4   Member of Former Member Direction of Investments................   22
            6.5   Allocation of Investment Experience.............................   22
            6.6   Manner and Time of Debiting Distributions.......................   22
            6.7   Title of Investments............................................   22
            6.8   Voting of Investments...........................................   22
            6.9   Voting of Atlantic Richfield Company Common Stock...............   23
            6.10  Allocation of Dividends on Atlantic Richfield Company
                  Common Stock....................................................   23
            6.11  Investment Advisory Fees........................................   24
            6.12  Member or Former Member Protection..............................   24
            6.13  Confidentiality.................................................   24

Section 7 - WITHDRAWALS DURING EMPLOYMENT
- ---------
            7.1   Age 59 1/2 Withdrawal...........................................   25
            7.2   Application and Basis for Hardship Withdrawal...................   25
            7.3   Partial Withdrawals of Member Contributions.....................   26
</TABLE>

                                       ii
<PAGE>

<TABLE>
<CAPTION>

Section 8 - PAYMENTS ON TERMINATION OF MEMBERSHIP OR OTHER REASONS
- ---------
            <S>   <C>                                                              <C>
            8.1   Termination of Employment.......................................   28
            8.2   Death...........................................................   29
            8.3   Disability......................................................   30
            8.4   Divorce.........................................................   30
            8.5   Rollover........................................................   30
            8.6   Notice..........................................................   31
            8.7   Distributions...................................................   31
            8.8   Distribution of Benefits........................................   33

Section 9 - LOANS TO MEMBERS
- ---------
            9.1   General.........................................................   34
            9.2   Eligibility.....................................................   34
            9.3   Loan Amount.....................................................   34
            9.4   Number of Loans.................................................   35
            9.5   Interest Rate...................................................   35
            9.6   Security........................................................   35
            9.7   Funding of the Loan.............................................   35
            9.8   Repayment of the Loan...........................................   35
            9.9   Deemed Distribution.............................................   36
            9.10   Default........................................................   36

Section 10 - CAPITAL ACCUMULATION ADMINISTRATIVE COMMITTEE
- ----------
            10.1   Capital Accumulation Plan Administrative Committee.............   37
            10.2   Rules of Conduct...............................................   37
            10.3   Legal, Accounting, Clerical....................................   37
            10.4   Interpretation of Provisions...................................   37
            10.5   Records of Administration......................................   37
            10.6   Claims for Benefits............................................   38
            10.7   Liability of Committee.........................................   39
            10.8   Unlocated Member...............................................   39
            10.9   Legal Representative...........................................   39

Section  11 - AMENDMENTS, DISCONTINUANCE, LIABILITIES
- ----------
            11.1   Amendment......................................................   40
            11.2   Termination....................................................   41
            11.3   Liability of Company...........................................   41

Section 12 - MISCELLANEOUS
- ----------
            12.1   Employment.....................................................   42
            12.2   Benefits Not Assignable........................................   42
            12.3   Discharge of Liability.........................................   42
            12.4   Governing Laws.................................................   42
            12.5   Limitation on Mergers..........................................   42
            12.6   Delegation of Fiduciary or Administrative Responsibilities.....   42
</TABLE>

                                      iii
<PAGE>

<TABLE>
<CAPTION>
          <S>    <C>                                                               <C>
            12.7   Named Fiduciary................................................   43

Section 13 - ROLLOVERS
- ----------
         13.1   Rollovers from Other Qualified Plans..............................   44
         13.2   Transfers from Individual Retirement Accounts.....................   44
         13.3   Membership........................................................   44
         13.4   Administration....................................................   44

Section 14 - TOP HEAVY PROVISIONS
- ----------
         14.1   Definitions.......................................................   46
         14.2   Minimum Allocation................................................   49
         14.3   ..................................................................   50
         14.4   ..................................................................   50
         14.5   ..................................................................   50
         14.6   ..................................................................   50
</TABLE>

                                       iv
<PAGE>

                              ATLANTIC RICHFIELD
                           CAPITAL ACCUMULATION PLAN

                                 INTRODUCTION

This Plan is intended to qualify as a Stock Bonus Plan under (S)401(a) of the
Internal Revenue Code of 1986, as amended, and as a Qualified Cash or Deferred
Arrangement under (S)401(k) of the Code.  Part of the Plan (the "ESOP Part") is
intended to qualify as an Employee Stock Ownership Plan under (S)4975(e)(7) of
the Code and such part is designed to invest primarily in Atlantic Richfield
Company Common Stock.

Effective March 14, 1999, the Atlantic Richfield Company Capital Accumulation
Plan III, the Atlantic Richfield Savings Plan II, the Atlantic Richfield Savings
Plan III and the Union Texas Petroleum Savings Plan for Salaried Employees (the
"Predecessor Plans") are merged into the Atlantic Richfield Capital Accumulation
Plan II and the name of the plan is changed to the Atlantic Richfield Capital
Accumulation Plan .

This amendment and restatement of the Plan is effective March 15, 1999, except
as otherwise indicated, and is intended to bring the Plan into compliance with
the Uniformed Services Employment and Re-employment Act of 1994, Small Business
Protection Act of 1996, subsequent legislation, and relevant regulations and
rulings.  The provisions of this amended and restated plan apply to persons who
are employed on or after March 15, 1999, unless otherwise indicated.

                                      -1-
<PAGE>

                                   SECTION 1
                                  DEFINITIONS

1.1  "Acquisition Loan"  means a loan or other extension of credit used by the
     Trustee to finance the acquisition of Atlantic Richfield Company Common
     Stock.

1.2  "Administrator"  means the Capital Accumulation Plan Administrative
     Committee.

1.3  "Annual Earnings" or "Earnings"  means the annual, actual wages or salary
     paid to a Member for the Member's personal service, including the amount of
     any Employee contribution pursuant to (S)125 and (S)401(k) of the Code, as
     amended, but excluding the Alaska benefit base enhancement and foreign
     service premiums/1/, and extra pay such as overtime, premiums, bonuses,
     living or other allowances.  Annual Earnings shall not exceed a Member's
     regular wages or salary as determined by the Company.  Annual Earnings or
     Earnings shall not exceed $160,000, as adjusted each Plan Year pursuant to
     (S)401(a)(17)(B) of the Code.

1.4  "Benefits Committee"  means a committee comprised of the Senior Vice
     President, Human Resources, the Senior Vice President and Treasurer, and
     the Senior Vice President and General Counsel, which Committee shall have
     responsibilities for amendments to the Plan as prescribed in Subparagraph
     11.1(b) of the Plan.

1.5  "Capital Accumulation Plan Administrative Committee" means the committee
     provided for in Section 10 of this Plan.

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

1.7  "Company" means Atlantic Richfield Company and such of its Subsidiaries or
     Affiliates whose Employees are included in this Plan upon authorization of
     Atlantic Richfield Company and adoption of this Plan by such authorized
     Subsidiary or Affiliate.

1.8  "Credited Company Service" means service with the Company, a predecessor
     company, and/or a Subsidiary or Affiliate which service the Company
     recognizes, on a basis uniformly applicable to all persons similarly
     situated, for purposes of this Plan.

1.9  "Effective Date" means the effective date of this amended and restated Plan
     which is March 15, 1999, unless otherwise indicated.

- --------------------------
  /1/  The exclusion of foreign service premiums shall not apply to a Member who
     on September 1, 1994 is in a foreign assignment until such time as the
     Member leaves the country in which the Member is employed on September 1,
     1994 or, if later, completes the assignment in which the Member was engaged
     on September 1, 1994.

                                      -2-
<PAGE>

1.10 "Elective Deferrals" or "Deferrals"  means reductions pursuant to an
     Employee Contribution Agreement of a Member's Annual Earnings, which
     amounts are transferred by the Company to the Trustee of the Plan.

1.11 "Employee"  means any person who is employed by the Company, excluding:

     (a)  Casual Employees, Project Employees and Leased Employees, as defined
          under the Atlantic Richfield Employment Status Classification Policy;

     (b)  Employees represented by any collective bargaining agent which has not
          negotiated the benefits of this Plan; and

     (c)  Any division or group of employees which is expressly excluded from
          eligibility for the Plan by action of Atlantic Richfield Company or,
          in the case of a Subsidiary or Affiliate, action by the Subsidiary or
          Affiliate by which such employees are paid.

1.12 "Employee Contribution Agreement"  means an agreement entered into between
     the Member and the Company, and by which the Member agrees to accept a
     reduction in Earnings from the Company equal to any whole (or fractions, as
     required by adjustments under Paragraph 3.3, 3.4 or 4.4) percentage, per
     payroll period.  This reduction may be on a pre-tax or after-tax basis, as
     elected by the Member.  This agreement shall apply to each payroll period
     during the period it is in effect in which the Member receives Earnings.
     In consideration of such agreement, the Company will transfer to the
     Member's pre-tax Elective Deferral subaccount or to the Member's after-tax
     Member Contribution subaccount, as applicable, the amount of the Elective
     Deferrals or Member Contributions at the time that regular salary payments
     are made to its Employees.

1.13 "ERISA"  means the Employee Retirement Income Security Act of 1974.

1.14 "Financed Shares"  means shares of Atlantic Richfield Company Common Stock
     acquired by the Trustee with the proceeds of an Acquisition Loan.

1.15 "Former Member" means a Member whose membership has terminated pursuant to
     Paragraph 2.3 and whose account has not been fully distributed.

1.16 "Highly Compensated Employee", effective July 1, 1997, means:

     (a)  Any employee who performs service during the determination year and is
          described in one or more of the following groups:

          (i)  An employee who is a five percent owner, as defined in
               (S)416(i)(1) of the Code, at any time during the determination
               year or the look-back year, as defined below; or

                                      -3-
<PAGE>

          (ii)  An employee who receives compensation in excess of $80,000, as
                adjusted pursuant to (S)415(d) of the Code during the look-back
                year.

     (b)  For purposes of the definition of Highly Compensated Employee the
          following will apply:

          (i)   The determination year is the Plan Year for which the
                determination of who is highly compensated is being made.

          (ii)  The look-back year is the 12-month period immediately preceding
                the determination year; provided, however, that for the Plan
                Year beginning March 15, 1999, the look-back year shall be the
                calendar beginning January 1, 1999.

          (iii) Employers aggregated under (S)414(b), (c), (m), or (o) of the
                Code are treated as a single employer.

          (iv)  Compensation, for purposes of this Paragraph 1.16 means
                compensation within the meaning of (S)415(c)(3) of the Code
                without regard to (S)125, (S)402(e)(3) and (S)402(h)(1)(B) of
                the Code.

     (c)  A former Employee who has a separation year prior to the determination
          year and who was a highly compensated active employee for either (i)
          such employee's separation year, or (ii) any determination year ending
          on or after the employee's 55th birthday will be a Highly Compensated
          Employee. Generally, a separation year is the determination year the
          employee separates from service. An employee who separated from
          service before January 1, 1987, will be included as a Highly
          Compensated Employee only if the Employee was a five percent owner or
          received compensation in excess of $50,000 during the year.

1.17 "Hour of Service"  means:

     (a)  Each hour for which an Employee is paid, or entitled to payment,
          for the performance of duties for the Company or any Subsidiary or
          Affiliate during the computation period in which the duties are
          performed.

     (b)  Each hour for which an Employee is paid, or entitled to payment,
          by the Company or any Subsidiary or Affiliate on account of a period
          of time during which no duties are performed (irrespective of whether
          the employment relationship has terminated) due to vacation, holiday,
          illness, incapacity (including disability), layoff, jury duty,
          military duty or leave of absence.

     (c)  Each hour for which back pay, irrespective of mitigation of
          damages, is either awarded or agreed to by the Company or any
          Subsidiary or Affiliate. Such hours shall be credited to the Employee
          for the computation period or

                                      -4-
<PAGE>

          periods to which the award or agreement pertains.

     (d)  An Employee will be credited with 200 Hours of Service, to the
          extent required by Federal law, for each month during which the
          Employee is on active duty in the Armed Forces of the United States
          and for which the Employee is not paid or entitled to be paid by the
          Company or any Subsidiary or Affiliate.

     (e)  Hours credited for any period under any provision of this
          Paragraph 1.17 may not also be credited for the same period under any
          other provisions of this Plan.  Hours shall be credited under
          Subparagraphs 1.17(a) thru (c) pursuant to U.S. Department of Labor
          Regulations under 29CFR (S)2530.200b-2, which are incorporated herein
          by this reference.

     (f)  For all purposes under the Plan, an Employee shall be credited with
          200 Hours of Service for each calendar month in which the Employee
          would otherwise be credited with one or more Hours of Service.

     (g)  Solely for purposes of determining whether a break in service has
          occurred in a computation period, and to the extent it does not
          duplicate Hours of Service credited under any other provision of this
          Paragraph 1.17, an individual who is absent from work for maternity or
          paternity reasons shall receive credit for the Hours of Service which
          would otherwise have been credited to such individual but for such
          absence, or in any case in which such hours cannot be determined,
          eight Hours of Service per day of such absence.  For purposes of this
          subparagraph, an absence from work for maternity or paternity reasons
          means an absence which commences on or after January 1, 1985, and is
          (i) by reason of the pregnancy of the individual; (ii) by reason of a
          birth of a child of the individual; (iii) by reason of the placement
          of a child with the individual in connection with the adoption of the
          child by such individual; or (iv) for purposes of caring for such
          child for a period beginning immediately following such birth or
          placement.  The Hours of Service credited under this subparagraph
          shall be credited within the computation period in which the absence
          begins if the crediting is necessary to prevent a break in service in
          that period, or in all other cases, in the following computation
          period.

1.18 "Matching Contributions"  means the Company contribution pursuant to
     Paragraph 4.1 of the Plan.

1.19 "Member"  means an Employee who has qualified for membership in accordance
     with the requirements of this Plan and whose membership has not terminated
     in accordance with Paragraph 2.3 of the Plan.

1.20 "Member's Account" or "Account"  means a separate account maintained by
     the Trustee for each Member consisting of (a) one subaccount to which is
     allocated

                                      -5-
<PAGE>

     the Member's Elective Deferrals, as adjusted for earnings and
     withdrawals, and realized and unrealized gains and losses attributable
     thereto; (b) a second subaccount to which is allocated Member Contributions
     as adjusted for earnings and withdrawals, and realized and unrealized gains
     and losses attributable thereto; (c) a third subaccount to which is
     allocated the Company's contributions as adjusted for earnings and
     withdrawals, and realized and unrealized gains and losses attributable
     thereto; and (d) a fourth subaccount to which is allocated rollovers
     pursuant to Section 13 and transfers pursuant to Subparagraph 2.6(b) as
     adjusted for earnings and withdrawals, and realized and unrealized gains
     and losses attributable thereto.

1.21 "Member Contributions"  means after-tax reductions in the Member's Annual
     Earnings pursuant to an Employee Contribution Agreement, which amounts are
     transferred by the Company to the Trustee.

1.22 "Plan" or "Plans"  means the Atlantic Richfield Capital Accumulation Plan
     as set forth herein, and any amendments thereto.

1.23 "Plan Year"  means the period commencing on March 15, 1999 and ending on
     December 31, 1999.  Thereafter, the Plan Year shall be the calendar year.

1.24 "Subsidiary" or "Affiliate"  means:

     (a)  Any corporation 50 percent or more of the voting stock of which is
          owned directly or indirectly by Atlantic Richfield Company or a
          Subsidiary or Affiliate; or

     (b)  Any partnership, joint venture or similar organization 50 percent or
          more of the profits interest or capital interest of which is owned
          directly or indirectly by Atlantic Richfield Company or a Subsidiary
          or Affiliate.

1.25 "Trust Agreement"  means the agreement of trust between the Trustee and
     Atlantic Richfield Company to hold contributions from the Company,
     Deferrals and Member Contributions of Members, transfers and rollovers, and
     investments thereof and earnings thereon.

1.26 "Trustee"  means the persons or corporations, or both, designated by the
     Trust Agreement.  The duties and responsibilities of the Trustee shall be
     those set forth in the Trust Agreement.

1.27 "Valuation Date" means the date or dates established by the Administrator
     for the valuation of the assets of the Plan.  In no event shall the assets
     of the Plan be valued less frequently than once each Plan Year.

                                      -6-
<PAGE>

                                   SECTION 2
                            MEMBERSHIP - ELIGIBILITY

2.1  Membership
     ----------

     (a)  Elective Deferrals and Member Contributions -  An Employee who is paid
          -------------------------------------------
          on the United States dollar payroll of the Company may become a Member
          and make Elective Deferrals and/or Member Contributions on or after
          the Employee's date of employment.

          To become a Member, an Employee must enter into an Employee
          Contribution Agreement in accordance with Section 3.

     (b)  Company Contributions -  An Employee who is paid on a United States
          ---------------------
          dollar payroll of the Company shall be eligible for Matching
          Contributions with respect to Elective Deferrals on the earlier of (i)
          or (ii) below:

          (i)  Completion of six months of Credited Company Service, or

          (ii) The end of any 12-consecutive-month period during which the
               Employee completes at least 1,000 Hours of Service.  Such 12-
               consecutive-month period shall commence on the Employee's date of
               employment or any anniversary thereof.

2.2  Notice to Administrator
     -----------------------

     The Company shall advise the Administrator as to the date an Employee
     becomes a Member. In the event that any question arises as to the
     eligibility of any Employee, the decision of the Administrator as to such
     Employee's eligibility shall be binding upon the Company, the Employees,
     the Members, the beneficiaries, and any and all other persons having or
     claiming any interest hereunder.

2.3  Membership Termination
     ----------------------

     (a)  An Employee's membership shall terminate upon:

          (i)  Death, disability, dismissal, retirement or termination of
               employment for any other reason;

          (ii) Continuation of a Participant's employment with an acquiring
               corporation in conjunction with a sale to the acquiring
               corporation of substantially all of the assets used by the
               Company or any Subsidiary or Affiliate in a trade or business
               which such entity conducts; or

                                      -7-
<PAGE>

          (iii) A disposition of the Company's interest in a Subsidiary
                or Affiliate when the Participant continues employment with such
                Subsidiary or Affiliate.

     (b)  A Member may not voluntarily terminate membership in this Plan during
          active employment with the Company.

     (c)  If a Member transfers to a Subsidiary or Affiliate which is not
          participating in this Plan, or to an employment classification
          excluded from Plan participation, the Member's eligibility to make
          Elective Deferrals and Member Contributions, and to receive Matching
          or nonelective  Contributions shall cease, but the Member's Account
          shall not be distributed until the Member has terminated employment
          with Atlantic Richfield Company or all of its Subsidiaries or
          Affiliates or is involved in a sale described in Subparagraph
          2.3(a)(ii) or (iii).

2.4  Member Suspension
     -----------------

     If an Employee is a Member of a defined contribution plan of the Company
     (including the Predecessor Plans), or a Subsidiary or Affiliate, and the
     Elective Deferrals to such plan of the Company or Subsidiary or Affiliate
     are suspended at the time the Employee becomes eligible for membership in
     this Plan, the Elective Deferrals and Employee's Contributions to the Plan
     shall commence with the first full pay period beginning on or after the
     date on which such period of suspension then in effect under the plan of
     the Company, or the Subsidiary or Affiliate, ends.

2.5  Member Transfers
     ----------------

     If a Member transfers to employment with a Subsidiary or Affiliate of the
     Company, which maintains a capital accumulation plan, the Member's Account
     shall be transferred to the capital accumulation plan of the Subsidiary or
     Affiliate in accordance with procedure established by the Administrator.

2.6  Capital Accumulation Plan Assets
     --------------------------------

     (a)  Upon the transfer of an Employee eligible to participate in the Plan
          from a Subsidiary or Affiliate, any assets maintained under a capital
          accumulation plan of such Subsidiary or Affiliate on behalf of such
          Employee will be transferred to the Plan in the same investment
          alternative under which held as of the transfer date, and such
          transferred assets will be subject to the reinvestment provisions
          under Paragraph 6.4, except as provided herein:

          (i)  Any assets transferred on behalf of a Member which have been
               invested in Common Stock of a Subsidiary or Affiliate in the
               subaccount attributable to the Member's Deferrals or Member

                                      -8-
<PAGE>

                Contributions under the capital accumulation plan of a
                Subsidiary or Affiliate will remain so invested, with future
                dividends being reinvested in such stock under the Member's
                Account, absent the Member's direction to reinvest such assets
                pursuant to Paragraph 6.4 of the Plan; provided, however, that
                any assets converted from the Common Stock of a Subsidiary or
                Affiliate to another investment alternative under the Plan may
                not be reinvested in Common Stock of a Subsidiary or Affiliate.

          (ii)  Any assets transferred on behalf of a Member which have been
                invested in the Common Stock of a Subsidiary or Affiliate in the
                subaccount attributable to Company Contributions under the
                capital accumulation plan of a Subsidiary or Affiliate, will
                remain so invested, with future dividends being reinvested in
                such stock under the Member's Account; provided, however, that
                the Member, unless the Employee is an officer of Atlantic
                Richfield Company, may elect to convert such assets to Atlantic
                Richfield Company Common Stock held under the ESOP Part of the
                Plan and any assets so converted may not be reinvested in the
                Common Stock of a Subsidiary or Affiliate. If the Member is an
                officer of Atlantic Richfield Company the Member may elect to
                convert such assets to Atlantic Richfield Company Common Stock
                held under the non-ESOP Part of the Plan and any assets so
                converted may not be reinvested in the Common Stock of a
                Subsidiary or Affiliate. This subparagraph does not apply to
                Atlantic Richfield Common Stock transferred to the Plan.

          (iii) Common Stock of a Subsidiary or Affiliate held by the
                Plan shall be subject to the sale and voting provisions of
                Section 6.

     (b)  Upon the transfer to the Company from Prestige Stations, Inc., any
          assets maintained under the Prestige Stations, Inc. 401(k) Plan, on
          behalf of an Employee eligible to participate in the Plan, shall be
          converted to cash and transferred to a Rollover Account established
          for the Employee.

                                      -9-
<PAGE>

                                   SECTION 3
                          MEMBERS' ELECTIVE DEFERRALS

3.1  Members' Elections
     ------------------

     (a)  Each Member who is an Employee may enter into an Employee Contribution
          Agreement with the Company providing for withholding of Elective
          Deferrals and/or Member Contributions from each of the Member's
          regular paychecks at a rate of one percent to 27 percent of the
          Member's Earnings, in whole percentages.  An Employee Contribution
          Agreement shall remain in effect until changed by the Member, except
          as otherwise set forth in this Section 3.

     (b)  A Member's election shall be made in the manner prescribed by the
          Administrator and shall include such information as the Administrator
          may require.  A Member may change the Member's election with respect
          to the Member's rate of future contributions at any time by giving
          notice in such manner as is prescribed by the Administrator.  Such
          changes shall be effective as soon as administratively feasible after
          the date of receipt of such notice by the Administrator, or its
          delegate.

     (c)  The Company may limit or reduce its Employee Contribution Agreement
          with any Member at any time, on a nondiscriminatory basis, to the
          extent necessary to ensure compliance with the limitations of
          Paragraph 3.3, 3.4, 4.4 or 4.7.

     (d)  A Member's Elective Deferrals and Member Contributions will be
          suspended as follows:

          (i)   Upon the Member's transfer, other than on an approved leave of
                absence, to employment with:

                (1) A Subsidiary or Affiliate which is not participating in the
                    Plan; or

                (2) Atlantic Richfield Company or any of its Subsidiaries or
                    Affiliates in such foreign countries as the Company shall
                    designate; the Member's Elective Deferrals and/or Member
                    Contributions shall automatically be suspended while the
                    Member remains in such employment.

          (ii)  Upon the Member's transfer to an employee group of the Company
                that is not participating in the Plan.

          (iii) As described in Section 7.

                                      -10-
<PAGE>

3.2  Contribution of Elective Deferrals and Member Contributions
     -----------------------------------------------------------

     The Company shall pay to the Trustee on behalf of each Member the Elective
     Deferrals and Member Contributions elected by the Member.  A Member's
     Elective Deferrals and Member Contributions shall be paid to the Trustee
     the earlier of the date such Elective Deferrals and Member Contributions
     can reasonably be segregated from the Company's general assets or the 15th
     day of the month following the month in which the Elective Deferrals and
     Member Contributions would have been paid to the Member.  Elective
     Deferrals and Member Contributions may be paid to the Trustee in the
     following forms:

     (a)  To the extent that a Member has directed pursuant to the Plan that his
          or her Elective Deferrals and/or Member Contributions be invested in
          an option other than Atlantic Richfield Common Stock, such Elective
          Deferrals and/or Member Contributions shall be paid to the Trustee in
          cash;

     (b)  To the extent that a Member has directed pursuant to the Plan that his
          or her Elective Deferrals and/or Member Contributions be invested in
          Atlantic Richfield Company Common Stock under the Non-ESOP Part of the
          Plan, such Elective Deferrals and/or Member Contributions may be paid
          to the Trustee in cash, in shares of Atlantic Richfield Company Common
          Stock, or in any combination thereof; and

     (c)  To the extent that a Member has directed pursuant to the Plan that his
          or her Elective Deferrals and/or Member Contributions be invested in
          Atlantic Richfield Company Common Stock under the ESOP Part of the
          Plan, such Elective Deferrals and/or Member Contributions may be paid
          to the Trustee in cash, in shares of Atlantic Richfield Company Common
          Stock, in the form of forgiveness of indebtedness on an Acquisition
          Loan from the Company to the Plan, or in any combination thereof.

3.3  Annual Dollar Limitation
     ------------------------

     (a)  A Member's Elective Deferrals for a calendar year, when considered
          together with the amount of salary reduction elected by the Member
          under any other plan meeting the requirement of (S)401(k) of the Code,
          may not exceed $10,000, as adjusted pursuant to Code (S)415(d).

     (b)  Once a Member's Elective Deferrals reach the limitation described in
          Subparagraph 3.3(a), all subsequent deferrals will be suspended for
          the remainder of the calendar year.  Elective Deferrals will
          automatically resume on the following January 1.  Unless the Member
          elects to change the Elective Deferral percent according to Paragraph
          3.1, Elective Deferrals will resume at the rate in effect on the
          suspension date.

                                      -11-
<PAGE>

     (c)  If a Member notifies the Administrator on or before March 31 after the
          close of a calendar year that the Member's total Elective Deferrals
          (within the meaning of (S)402(g)(3) of the Code) for such calendar
          year exceed the limitation of Subparagraph 3.3(a), the Administrator
          shall direct that such excess Elective Deferrals, plus any income and
          minus any loss allocable thereto for the calendar year, be distributed
          no later than the April 15 following notification to the
          Administrator.  A Member is deemed to notify the Administrator of
          Elective Deferrals in excess of the limitation in Subparagraph 3.3(a)
          that arise by taking into account those Elective Deferrals made to the
          Plan or to any other Plan of the Company or a Subsidiary or Affiliate.

     (d)  For purposes of Subparagraph 3.3(c), gain or loss allocable to excess
          Elective Deferrals shall be computed under the method used by the Plan
          to allocate gains and losses.

3.4  Actual Deferral Percentage Tests
     --------------------------------

     The Plan shall comply with the requirements of (S)401(k)(3) of the Code,
     the regulations thereunder, including Treas. Reg. 1.401(k)-1(b) and
     Internal Revenue Service guidance in this regard, which provisions are
     incorporated herein by this reference. To the extent permitted by
     regulations, Matching Contributions described in Paragraph 4.1 and
     nonelective contributions described in Paragraph 4.8 may, at the discretion
     of the Administrator, be deemed Elective Deferrals for purposes of this
     Paragraph 3.4. Effective July 1, 1997, in determining whether the Plan
     satisfies the requirements of (S)401(k)(3) of the Code, the Plan shall use
     the prior-year testing method.

3.5  Distribution of Excess Contributions
     ------------------------------------

     (a)  If the average actual deferral percentage test of Paragraph 3.4 is not
          satisfied for a Plan Year, then the Excess Contributions, as defined
          below, and gain or loss allocable thereto, shall be distributed, to
          the extent required under Treasury regulations, no later than the last
          day of the Plan Year following the Plan Year for which the Excess
          Contributions were made.

     (b)  Effective July 1, 1997, for purposes of this paragraph, Excess
          Contributions shall consist of the excess of the aggregate amount of
          Elective Deferrals made by or on behalf of the affected Highly
          Compensated Employees over the maximum amount of all such
          contributions permitted under the test of Paragraph 3.4.  In reducing
          the excess contributions hereunder, the reduction shall be first
          applied to the Highly Compensated Employee with the highest percentage
          under Paragraph 3.4.  If reductions are further required to comply
          with Paragraph 3.4, such reductions shall be applied to the Highly
          Compensated Employee with the next highest percentage, and so forth
          until the nondiscrimination test of Paragraph 3.4 is satisfied.  The

                                      -12-
<PAGE>

          aggregate amount of reductions determined in the preceding sentence
          shall be distributed, together with gain or loss allocable thereto, to
          the Highly Compensated Employees with the highest dollar amount of
          Elective Deferrals.  The Elective Deferrals of the Highly Compensated
          Employee with the highest dollar amount of Elective Deferrals are
          reduced by the amount required to cause such Highly Compensated
          Employee's Elective Deferrals to equal the Elective Deferral amount of
          the Highly Compensated Employee with the next highest dollar amount of
          Elective Deferrals.  If the total amount distributed to the Highly
          Compensated Employee is less than the total Excess Contribution, this
          process shall be repeated until the total Excess Contributions are
          distributed.

     (c)  The gain or loss allocable to Excess Contributions shall be determined
          by multiplying the gain or loss allocable to the Member's Elective
          Deferrals for the Plan Year by a fraction, the numerator of which is
          the Excess Contributions made on behalf of the Member for the Plan
          Year, and the denominator of which is the sum of the Member's Account
          balances attributable to the Member's Elective Deferrals amounts on
          the last day of the Plan Year.

3.6  Make-Up Elective Deferrals and Member Contributions
     ---------------------------------------------------

     Notwithstanding any provision of the Plan to the contrary, Elective
     Deferrals and Member Contributions with respect to qualified military
     service may be made in accordance with (S)414(u) of the Code.

                                      -13-
<PAGE>

                                   SECTION 4
                              COMPANY CONTRIBUTION

4.1  Matching Contribution
     ---------------------

     Subject to the provisions of Paragraphs 4.3 and 4.4, for each pay period,
     the Company shall pay to the Trustee a contribution on behalf of each
     Member equal to 160 percent of the Member's Elective Deferrals, including
     Elective Deferrals under Paragraph 3.6, for the pay period which do not
     exceed five percent of the Member's Earnings for the pay period. This
     contribution shall be made no later than 30 days following the date on
     which the related Member Deferrals are made, or as soon as administratively
     practicable, if later, and except for Members who have attained age 55,
     shall be made under the ESOP Part of the Plan.

4.2  Form of Contribution
     --------------------

     Matching Contributions may be made in the form of cash, shares of Atlantic
     Richfield Company Common Stock, forgiveness of indebtedness on an
     Acquisition Loan from the Company to the Plan, or any combination of the
     foregoing.

4.3  Members Excluded From Contribution
     ----------------------------------

     The Matching Contribution shall not be made on behalf of a Member described
     in one or more of the following subparagraphs:

     (a)  A Member who is an officer of Atlantic Richfield Company; or

     (b)  A Member whose base salary is more than $150,000 on an annualized
          basis.

4.4  Actual Contribution Percentage Test
     -----------------------------------

     With respect to Member Contributions and Matching Contributions, the Plan
     shall comply with the requirements of (S)401(m)(2) of the Code, the
     regulations thereunder, including Treas. Reg. (S)1.401(m)-1(b) and Internal
     Revenue Service guidance in this regard, which provisions are incorporated
     herein by this reference. To the extent permitted by regulations, Elective
     Deferrals described in Paragraph 3.1 and nonelective contributions
     described in Paragraph 4.8 may, at the discretion of the Administrator, be
     taken into account in satisfying the requirements of this Paragraph 4.4.
     Effective July 1, 1997, in determining whether the Plan satisfies the
     requirements of Section 401(m)(2) of the Code, the Plan shall use the
     prior-year testing method.

                                      -14-
<PAGE>

4.5  Distribution of Excess Aggregate Contributions
     ----------------------------------------------

     (a)  If the nondiscrimination tests of Paragraph 4.4 are not satisfied for
          a Plan Year, then the Excess Aggregate Contributions, as defined
          below, and any gain or loss allocable thereto, shall be distributed to
          the Member on whose behalf the Excess Aggregate Contributions were
          made no later than the last day of the Plan Year following the Plan
          Year for which such Excess Aggregate Contributions were made.  Member
          Contributions shall be distributed before Matching Contributions.

          Notwithstanding the foregoing, to the extent otherwise required to
          comply with the requirements of (S)401(a)(4) of the Code and
          regulations thereunder, vested Matching Contributions may be
          forfeited.

     (b)  Effective July 1, 1997, for purposes of this paragraph, Excess
          Aggregate Contributions shall consist of the excess of the amount of
          Member Contributions, Matching Contributions, and Elective Deferrals
          (to the extent not used to satisfy the average actual deferral
          percentage test of Section 3.4) made on behalf of the affected Highly
          Compensated Employees over the maximum amount of all such
          contributions permitted under the nondiscrimination tests under
          Paragraph 4.4.  In reducing the Excess Aggregate Contributions
          hereunder, the reduction shall be first applied to the Highly
          Compensated Employee with the highest percentage under Paragraph 4.4.
          If reductions are further required to comply with Paragraph 4.4, such
          reductions shall be applied to the Highly Compensated Employee with
          the next highest percentage, and so forth until the nondiscrimination
          tests of Paragraph 4.4 are satisfied.  The aggregate amount of
          reductions determined in the preceding sentence shall be distributed
          together with gain or loss allocable thereto, to the Highly
          Compensated Employees with the highest dollar amount of Member
          Contributions and Matching Contributions.  The Member Contributions
          and Matching Contributions of the Highly Compensated Employee with the
          highest dollar amount of such contributions are reduced by the amount
          required to cause such Highly Compensated Employee's Member
          Contributions and Matching Contributions to equal the Member
          Contributions and Matching Contributions of the Highly Compensated
          Employee with the next highest dollar amount of such contributions.
          If the total amount distributed to the Highly Compensated Employee is
          less than the total Excess Aggregate Contribution, this process shall
          be repeated until the total Excess Aggregate Contributions are
          distributed.

     (c)  The gain or loss allocable to Excess Aggregate Contributions shall be
          determined by multiplying the gain or loss allocable to such
          contributions by a fraction, the numerator of which is the Excess
          Aggregate Contributions on behalf of the Member for the Plan Year, and
          the denominator of which is the

                                      -15-
<PAGE>

          sum of the Member's Account balances attributable to Excess Aggregate
          Contributions on the last day of the Plan Year.

4.6  Limitation On The Multiple Use Alternative
     ------------------------------------------

     (a)  The sum of the average actual deferral percentage of Highly
          Compensated Employees under Paragraph 3.4 and the average contribution
          percentage of Highly Compensated Employees under Paragraph 4.4 shall
          not exceed the "aggregate limit", as defined in (S)401(m)(9) of the
          Code and the regulations thereunder.

     (b)  If the aggregate limit is exceeded, the average contributions
          percentage of the Highly Compensated Employees shall be reduced in
          accordance with the provisions of Paragraph 4.5.  In lieu of reducing
          the average contribution percentage, the Administrator may reduce the
          average actual deferral percentage of the Highly Compensated Employees
          in accordance with the provisions of Paragraph 3.4.  The reductions
          under this paragraph shall be made only to the extent necessary to
          comply with the restrictions on the multiple use of the alternative
          limitation within the meaning of Code (S)401(m)(9).

4.7  Section 415 Limitations
     -----------------------

     (a)  In addition to other limitations set forth in the Plan and
          notwithstanding any other provisions of the Plan, "annual additions"
          made to this Plan (and all other defined contribution plans required
          to be aggregated with the Plan under the provisions of (S)415 of the
          Code) shall not exceed an amount in excess of the limit set forth in
          such section of the Code.  For purposes of calculating such limit
          under (S)415 of the Code, the "limitation year" shall be the calendar
          year.  Elective Deferrals, Member Contributions and Matching
          Contributions in excess of the actual deferral and contribution
          percent tests of Sections 3.4 and 4.4 are considered annual additions
          even if corrected through distribution.

     (b)  If the limitations described in (S)415(c) of the Code are exceeded for
          a Member for a limitation year, the excess will be eliminated as
          follows:

          (i)  Provisions of any other defined contribution plans established by
               the Company or a Subsidiary or Affiliate which have caused the
               limits to be exceeded will be applied; provided, however, that if
               such other Plan is described in (S)401(k) of the Code, the
               provisions of the Plan in which the Member is active as of the
               last day of the limitation year shall be applied before the
               provisions of the Plan in which the Member is inactive.

                                      -16-
<PAGE>

          (ii)  Amounts attributable to after-tax contributions made by the
                Member to the Plan (or any other plan maintained by the Company
                or any Subsidiary or Affiliate) shall be paid to the Member.

          (iii) Amounts attributable to Elective Deferrals made by a
                Member to the Plan (or any other plan maintained by the Company
                or a Subsidiary or Affiliate) shall be paid to the Member.

          (iv)  The excess, if any, will be held unallocated in a suspense
                account.  The suspense account will be applied to reduce
                contributions for remaining Members in the limitation year, and
                each succeeding limitation year, if necessary.  If a suspense
                account is in existence at any time during the limitation year
                pursuant to this subparagraph, it will not participate in the
                allocation of the investment gains and losses.

     (c)  Prior to January 1, 2000, if the limitations described in (S)415(e) of
          the Code are exceeded for a Member for a limitation year, the excess
          will be eliminated by applying the provisions of the defined benefit
          plan in which the Member participates.

4.8  Nonelective Contributions
     -------------------------

     (a)  The Administrator, in its sole discretion, may make a nonelective
          contribution to the Accounts of certain Members who are not highly
          compensated to the extent necessary to satisfy the requirement of
          Paragraph 3.4 and/or 4.4 of the Plan, or to assist the Plan or any
          other plan of the Company or any Subsidiary or Affiliate to satisfy
          the requirements of (S)410(b) of the Code.

     (b)  A contribution under Subparagraph 4.8(a) shall be allocated to
          eligible Members in the ratio that the Earnings of each such Member
          for the Plan Year bears to the total Earnings of all such Member's for
          the Plan Year.

     (c)  The Company shall make contributions necessary to reinstate Members'
          Accounts pursuant to Paragraph 10.8 of the Plan.

     (d)  The Company may make contributions necessary to correct administrative
          errors relative to a Member's Account.

4.9  Exclusive Benefit
     -----------------

     The corpus or income of the trust may not be divested to or used for other
     than the exclusive benefit of the Members and their beneficiaries and to
     defray reasonable expenses of administering the Plan.

                                      -17-
<PAGE>

                                   SECTION 5
                                FINANCED SHARES

5.1  Acquisition Loans
     -----------------

     Atlantic Richfield Company, by action of its Treasurer, may direct the
     Trustee to incur Acquisition Loans from time to time to finance the
     acquisition of Atlantic Richfield Company Common Stock (Financed Shares)
     under the ESOP Part of the Plan or to repay a prior Acquisition Loan. For
     this purpose, an installment obligation incurred in connection with the
     purchase of Atlantic Richfield Company Common Stock shall be treated as an
     Acquisition Loan.

     An Acquisition Loan shall be for a specific term, shall bear a reasonable
     rate of interest, and shall not be payable on demand except in the event of
     default. An Acquisition Loan may be secured by a pledge of the Financed
     Shares so acquired (or acquired with the proceeds of a prior Acquisition
     Loan which is being refinanced). No other assets of the Plan may be pledged
     as collateral for an Acquisition Loan, and no lender shall have recourse
     against assets of the Plan other than Financed Shares remaining subject to
     pledge. If the lender is a "party in interest" [as defined in (S)3(14) of
     ERISA], the Acquisition Loan must provide that in the event of default,
     assets of the Plan may be transferred to the lender only upon, and to the
     extent of, the failure of the Plan to meet the payment schedule of the
     Acquisition Loan. Any pledge of Financed Shares must provide for the
     release of the shares so pledged as payments on the Acquisition Loan are
     made by the Trustee and such Financed Shares are allocated to Members'
     Accounts under Paragraph 5.2.

     Payments of principal and/or interest on any Acquisition Loan shall be made
     by the Trustee, as directed by the Company, only from: (a) Company
     Contributions paid in cash to enable the Plan to make payments on such
     Acquisition Loan [including Elective Deferrals and Member Contributions, to
     the extent that Members have directed pursuant to the Plan that such
     Elective Deferrals and/or Member Contributions be invested in shares of
     Atlantic Richfield Company Common Stock under the ESOP Part of the Plan]
     and earnings attributable thereto; (b) the proceeds of any Acquisition Loan
     and the earnings attributable thereto; and (c) any cash dividends received
     by the Plan on the Financed Shares purchased with the proceeds of such
     Acquisition Loan. The payments made with respect to an Acquisition Loan for
     a Plan Year must not exceed the sum of such Matching Contributions,
     Elective Deferrals, Member Contributions, proceeds, earnings, and dividends
     for that Plan Year and prior Plan Years, as reduced by the amount applied
     to make such payments in prior Plan Years. As directed by Atlantic
     Richfield Company, the Trustee also may sell any Financed Shares that have
     not yet been allocated to Members' Accounts and use the proceeds from such
     sale to pay principal and/or interest on the Acquisition Loan used to
     acquire such shares.

                                      -18-
<PAGE>

5.2  Payments on Acquisition Loan
     ----------------------------

     The acquisition of Atlantic Richfield Company Common Stock with the
     proceeds of an Acquisition Loan may be made on the open-market, or from the
     Company, in a single purchase or a series of purchases over a period of
     time. Prior to use for such purchase or purchases, the Acquisition Loan
     proceeds may be invested by the Trustee (as directed by Atlantic Richfield
     Company) in interest-bearing accounts or instruments. Interest derived
     therefrom shall be applied to make payments on the Acquisition Loan, or, if
     the Acquisition Loan has been repaid in full, shall be allocated as of the
     last day of the Plan Year among the Accounts of all Members who have not
     terminated membership pursuant to Paragraph 2.3 as of such date in
     proportion to their Earnings for the Plan Year.

     All Financed Shares acquired by the Plan shall initially be credited to a
     loan suspense account, and will be allocated to the Members' Accounts only
     as payments on the Acquisition Loan are made. Release from the loan
     suspense account for allocation to Members' Accounts in each Plan Year
     shall be based on shares of stock or other non-monetary units, rather than
     by dollar amount, and shall not be less than the number calculated as
     follows:

     (a)  The number of Financed Shares held in the loan suspense account
          immediately before the release in the current Plan Year shall be
          multiplied by a fraction, the numerator of which is the amount of
          principal and interest paid on the Acquisition Loan for that Plan
          Year, and the denominator of which is the sum of the numerator plus
          the total payments of principal and interest on that Acquisition Loan
          projected to be paid for all future Plan Years.  For this purpose, the
          interest to be paid in future Plan Years is computed by using the
          interest rate in effect as of the last day of the current Plan Year.

     (b)  In lieu of the method described in Subparagraph 5.2(a), the Company
          may elect (as to each  Acquisition Loan) or the provisions of the
          Acquisition Loan may provide for the release of Financed Shares from
          the loan suspense account based solely on the ratio that the payments
          of principal for each Plan Year bear to the total principal amount of
          the Acquisition Loan. This method may be used only if:  (i) the
          Acquisition Loan provides for annual payments of principal and
          interest at a cumulative rate that is not less rapid at any time than
          level annual payments of such amounts for ten years; (ii) interest
          included in any payment on the Acquisition Loan is disregarded only to
          the extent that it would be determined to be interest under standard
          loan amortization tables; and (iii) the entire duration of the
          Acquisition Loan repayment period does not exceed ten years, even in
          the event of a renewal, extension, or refinancing of the Acquisition
          Loan.

     As of each date that payments (other than payments with the proceeds of a
     new Acquisition Loan) are made on an Acquisition Loan, the Financed Shares
     released

                                      -19-
<PAGE>

     from the loan suspense account shall be allocated to Members' Accounts in
     proportion to the amounts debited from each Member's Account to make the
     Acquisition Loan payments.

                                      -20-
<PAGE>

                                   SECTION 6
              INVESTMENT OF MEMBERS' AND FORMER MEMBERS' ACCOUNTS

6.1      Members' and Former Members' Accounts
         -------------------------------------

         The Administrator shall establish and maintain an Account in the name
         of each Member and Former Member. Separate records shall be maintained
         with respect to the portion of a Member's or Former Member's Account
         attributable to Elective Deferrals, Member Contributions, rollovers
         under Section 13, Matching Contributions, and earnings thereon.

6.2      Investment of Elective Deferrals, Member Contribution, Rollovers and
         --------------------------------------------------------------------
         Certain Matching Contributions
         ------------------------------

         (a)    In accordance with procedures established by the Administrator,
                the following amounts shall be invested by the Trustee among the
                investment alternatives authorized by the Administrator in the
                proportion indicated by the Member or Former Member in his or
                her investment directions provided to the Administrator, or its
                delegate:

                (i)     Elective Deferrals;
                (ii)    Member Contributions;
                (iii)   Rollovers;
                (iv)    Matching Contributions pursuant to Subparagraph 6.3(b);
                        and
                (v)     Matching Contributions to the Atlantic Richfield Savings
                        Plans II and III made prior to July 1, 1988.

         (b)    Notwithstanding anything in the Plan to the contrary, the
                Trustee may limit the daily volume of purchases or sales of
                Atlantic Richfield Common Stock to the extent it believes such
                action to be in the best interest of Members or Former Members.

6.3      Investment of Company Contributions
         -----------------------------------

         (a)    Except as provided in Subparagraph 6.3(b), all Matching
                Contributions and nonelective contributions pursuant to
                Subparagraph 4.8(a), and any amounts of interest attributable to
                the proceeds of an Acquisition Loan allocated to Members' or
                Former Members' Accounts pursuant to Paragraph 5.2 after the
                Acquisition Loan has been repaid in full, shall at all times be
                invested in Atlantic Richfield Company Common Stock under the
                ESOP Part of the Plan. Contributions under Paragraph 4.1 made in
                cash shall be applied to purchase shares of Atlantic Richfield
                Company Common Stock or to make payments on an Acquisition Loan
                within a reasonable time after being paid to the Trustee or
                after being allocated to Members' or Former Members' Accounts.

                                      -21-
<PAGE>

         (b)    A Member or Former Member who has attained age 55 may invest
                Company Contributions in any of the investment alternatives set
                forth in Paragraph 6.2.

6.4      Member or Former Member Direction Of Investments
         ------------------------------------------------

         In accordance with procedures established by the Administrator, each
         Member or Former Member may direct how his or her Account is to be
         invested among the available investment funds. In the event a Member or
         Former Member fails to make an investment election, with respect to all
         or any portion of his or her Account, the Trustee shall invest all or
         such portion of his or her Account in the investment fund to be
         designated by the Administrator. Under procedures established by the
         Administrator, a Member or Former Member may change his or her
         investment election, with respect to future contributions and amounts
         previously accumulated in the Member's or Former Member's Account. Any
         such change in a Member's or Former Member's investment election shall
         be effective at such time as may be prescribed by the Administrator.

6.5      Allocation of Investment Experience
         -----------------------------------

         As of each Valuation Date, the investment funds of the Trust, other
         than shares of Company Common Stock, shall be valued at fair market
         value, and the income, loss, appreciation and deprecation (realized and
         unrealized), and any paid expenses of the Trust attributable to such
         fund shall be apportioned among Member's or Former Member's Accounts
         within the fund based upon the value of each Account within the fund as
         of the preceding Valuation Date.

6.6      Manner and Time of Debiting Distributions
         -----------------------------------------

         For any Member or Former Member who is entitled to receive a
         distribution from his or her Account, the amount distributed shall be
         based upon the fair market value of the Member's or Former Member's
         Account as of the Valuation Date immediately preceding the
         distribution.

6.7      Title of Investments
         --------------------

         All investments will be held in the name of the Trustee or its
         nominees.

6.8      Voting of Investments
         ---------------------

         Except as provided in Paragraph 6.9, the Trustee in accordance with the
         Trust Agreement, shall exercise all voting and other rights associated
         with any investments held in the Plan.

                                      -22-
<PAGE>

6.9      Voting of Atlantic Richfield Company Common Stock
         -------------------------------------------------

         (a)    The Trustee shall vote whole shares of Atlantic Richfield
                Company Common Stock credited to each Member's or Former
                Member's Account in accordance with such Members' or Former
                Members' written instructions. Fractional shares of Atlantic
                Richfield Company Common Stock shall be aggregated into whole
                shares of stock and voted by the Trustee, to the nearest whole
                vote, in the same proportion as shares are to be voted by the
                Trustee pursuant to Members' or Former Members' written
                instructions. In the absence of voting instructions by one or
                more Members or Former Members, the Trustee shall vote
                uninstructed shares, to the nearest whole vote, in the same
                proportion as shares are to be voted by the Trustee pursuant to
                Members' or Former Members' written instructions. The Trustee
                shall vote unallocated shares, to the nearest whole vote, in the
                same proportion as allocated shares are to be voted by the
                Trustee pursuant to Members' or Former Members' written
                instructions.

         (b)    The Trustee shall exercise rights other than voting rights
                attributable to whole shares of Atlantic Richfield Company
                Common Stock credited to each Member's or Former Member's
                Account in accordance with such Members' or Former Members'
                written instructions. Rights attributable to fractional shares
                of Company Common Stock (which for this purpose shall be
                aggregated into whole shares of stock) shall be exercised by the
                Trustee in the same proportion as rights which are exercised by
                the Trustee pursuant to Members' or Former Members' written
                instructions. In the absence of instructions by one or more
                Members or Former Members, the Trustee shall exercise
                uninstructed rights in the same proportion as rights which are
                to be exercised by the Trustee pursuant to Members' or Former
                Members' written instructions. The Trustee shall exercise rights
                attributable to unallocated shares in the same proportion as
                rights attributable to allocated shares which are to be
                exercised by the Trustee pursuant to Members' or Former Members'
                written instructions. Notwithstanding the foregoing, in the
                absence of directions, the Trustee shall not tender shares of
                Common Stock in the same proportion as shares are tendered
                pursuant to Member's or Former Member's written instructions.

         (c)    The Trustee shall notify the Members or Former Members of each
                occasion for the exercise of voting rights and rights other than
                voting rights within a reasonable time before such rights are to
                be exercised. This notification shall include all the
                information that the Company distributes to shareholders
                regarding the exercise of such rights.

6.10     Allocation of Dividends on Atlantic Richfield Company Common Stock
         ------------------------------------------------------------------

         (a)    Any cash dividends declared on Atlantic Richfield Company Common
                Stock held in a Member's or Former Member's Account under the
                ESOP Part of

                                      -23-
<PAGE>

                the Plan as of the record date for the dividend shall be paid in
                cash to the Member or Former Member (or, in the event of death,
                to the Member's or Former Member's beneficiary) on, or as soon
                as possible following, the payment date for the dividend.

         (b)    Any cash dividends declared on Atlantic Richfield Company Common
                Stock held in a loan suspense account as of the record date for
                the dividend shall be used to make payments on the Acquisition
                Loan used to acquire the shares of stock held in such account.

         (c)    Except as provided in Subparagraphs 6.10(a) and (b), all
                dividends or other distributions attributable to shares of
                Atlantic Richfield Company Common Stock shall be allocated to
                the Account of the Member or Former Member whose Account is
                credited with such shares.

6.11     Investment Advisory Fees
         ------------------------

         The investment advisory fees, if any, incurred for management of any of
         the investment funds are charged to each respective fund.

6.12     Member or Former Member Protection
         ----------------------------------

         No shares of Atlantic Richfield Company Common Stock held by the ESOP
         Part of the Plan may be subject to a put, call or other option, or
         buy/sell or similar arrangement. The provisions of this Paragraph 6.12
         shall continue to be applicable to the shares of Atlantic Richfield
         Company Common Stock held by the ESOP Part of the Plan even if such
         part ceases to be an Employee Stock Ownership Plan under (S)4945(e)(7)
         of the Code.

6.13     Confidentiality
         ---------------

         The Capital Accumulation Plan Administrative Committee shall be
         responsible for ensuring the adequacy of procedures established by the
         Administrator to safeguard the confidentiality of information relating
         to the purchasing, holding and selling of Atlantic Richfield Company
         Common Stock and any voting, tender or similar rights relating to such
         stock.

                                      -24-
<PAGE>

                                   SECTION 7
                         WITHDRAWALS DURING EMPLOYMENT

7.1      Age 59 1/2 Withdrawal
         ---------------------

         A Member who has attained age 59 1/2 may request that all or a portion
         of the Member's Account be paid to the Member. The request must be made
         at such time and in such manner as prescribed by the Administrator.

7.2      Application and Basis for Hardship Withdrawal
         ---------------------------------------------

         (a)    A Member may at any time request that the Member's Elective
                Deferrals (but not the earnings thereon) be paid to the Member
                due to financial hardship. The request must be made to the
                Administrator at such time and in such manner as prescribed by
                the Administrator and shall include such documentation and/or
                written explanation requested by the Administrator.

         (b)    The Administrator shall authorize a withdrawal on account of
                financial hardship only upon making a written determination that
                the withdrawal does not exceed the amount of the immediate and
                heavy financial need of the Member, including amounts withheld
                for taxes and the amount of any early distribution taxes, if
                any, and that the withdrawal is based on the need for funds
                under one or more of the five following circumstances:

                (i)     The payment of unreimbursable medical expenses described
                        in (S)29(d) of the Code previously incurred by the
                        Member, the Member's spouse, or any dependents of the
                        Member (as defined in (S)152 of the Code) or necessary
                        for these persons to obtain medical care;

                (ii)    The payment of all or a portion of the purchase price
                        (excluding mortgage payments) of a principal residence
                        of the Member;

                (iii)   The payment of tuition and related educational expenses
                        for the next 12 months of post-secondary education for
                        the Member, his or her spouse, children or dependents,
                        as defined in Code (S)152;

                (iv)    The need to prevent the eviction of the Member from his
                        or her principal residence or foreclosure on the
                        mortgage of the Member's principal residence; and

                (v)     The need to satisfy a judgment of a federal, state or
                        local court against the Member (such withdrawal will be
                        permitted only if a written determination is made that
                        such withdrawal is necessary in light of immediate and
                        heavy financial need of the Member).

         (c)    Hardship withdrawals shall be paid as follows:

                                      -25-
<PAGE>

                (i)     A hardship withdrawal shall be paid in a single payment
                        to the Member within 60 days following the
                        Administrator's favorable determination.

                (ii)    A hardship withdrawal shall not cause a termination of
                        Membership in the Plan.

         (d)    As a condition to receiving the withdrawal:

                (i)     The Member must have obtained all distributions and all
                        nontaxable loans available as of the date of the
                        withdrawal under this Plan and any other employee
                        benefit plan maintained by the Company and any
                        Subsidiary or Affiliate;

                (ii)    The Member's contributions to the Plan and any other
                        defined contribution or defined benefit employee pension
                        benefit plan maintained by the Company and any
                        Subsidiary or Affiliate are to be suspended for 12
                        months; and Elective Deferrals shall be suspended for
                        the remainder of the calendar year in which the hardship
                        distribution occurs and the calendar year immediately
                        following such calendar year.

7.3      Partial Withdrawals of Member Contributions
         -------------------------------------------

         (a)    An application for partial withdrawal of funds attributable to
                Member Contributions must be in the form prescribed by the
                Administrator. Distribution will be made as soon as practicable
                after the date the application is received by the Administrator.

         (b)    A Member may make the following partial withdrawals during
                employment with the Company; provided, that (i) partial
                withdrawals under this Paragraph 7.3 are made at not less than
                six-month intervals, and (ii) Member Contributions made prior to
                January 1, 1987, must be withdrawn prior to withdrawal of any
                other contributions and earnings:

                (i)     Items in the Member's Account derived from Member
                        Contributions, and earnings thereon (Member
                        Contributions made prior to January 1, 1987 must be
                        withdrawn first);

                (ii)    Items in the Member's Account derived from Company
                        Contribution to an ARCO Savings Plan made prior to July
                        1, 1988, and earnings thereon; and

         (c)    In addition to the withdrawals described in Subparagraph 7.3(b),
                a Former Member of the Union Texas Petroleum Savings Plan for
                Salaried Employees (the "UTP Plan") whose account balance has
                been transferred

                                      -26-
<PAGE>

                to the Plan and who has withdrawn all Member Contributions made
                to such plan prior to January 1, 1987, and earnings thereon, may
                withdraw the following amounts:

                (i)     If the Member made elective deferrals to the UTP Plan
                        for at least 60-consecutive months, all or a portion of
                        the Member's Company Contributions, and earnings
                        thereon, under the UTP Plan; and

                (ii)    If the Member has not made elective deferrals for at
                        least 60-consecutive months, Company Contributions under
                        the UTP Plan and earnings thereon that have been held in
                        the UTP Plan and this Plan for at least 24 months.

                                      -27-
<PAGE>

                                   SECTION 8
             PAYMENTS ON TERMINATION OF MEMBERSHIP OR OTHER REASONS


8.1      Termination of Membership
         -------------------------

         (a)    If a Member's membership in the Plan is terminated due to
                disability, termination of employment for any other reason
                except death, or as the result of a sale described in
                Subparagraphs 2.3(a)(ii) or (iii), the Member may receive all
                items in the Member's Account. Each Member shall be fully vested
                at all times in all items in the Member's Account, whether the
                same be derived from Elective Deferrals, Member Contributions,
                Company Contributions or rollovers, and earnings thereon.

         (b)    Upon the election of the Member who has terminated membership,
                all items in such Member's Account shall be distributed to the
                Member. With respect to a Former Member who does not request a
                distribution:

                (i)     Notwithstanding anything to the contrary in this
                        Paragraph 8.1, a Former Member's Account shall be
                        distributed in accordance with the provisions of
                        Paragraph 8.7;

                (ii)    In the case of the Former Member's death prior to final
                        distribution, the Former Member's Account shall be
                        distributed in accordance with Paragraph 8.2 of the
                        Plan; and

                (iii)   No loans or hardship withdrawals may be taken following
                        termination of membership or disability.

         (c)    Notwithstanding anything to the contrary in this Paragraph 8.1,
                all items in the Account of a Member who has terminated
                membership, and whose Account balance is $5,000 or less on the
                date of determination, shall be distributed as soon as
                administratively practicable following the Member's termination
                of membership, unless the Member elects an earlier distribution
                date.

         (d)    Notwithstanding anything in the Plan to the contrary, when a
                Former Member elects to receive all items in the Former Member's
                Account and, in conjunction therewith, directs that items in his
                or her Account be converted pursuant to Paragraph 6.4, the
                conversion shall be transacted on the later of the first
                transaction date under the Plan following the Administrator's
                receipt of a request for distribution, or the date of
                termination. Distribution under this Paragraph 8.1 shall be made
                in accordance with the requirements of 409(h) of the Code in the
                form of cash, Company stock or a combination thereof, as elected
                by the Member. If the Member does not make an election
                hereunder, Company stock will be distributed in kind and

                                      -28-
<PAGE>

                all other investment alternative shall be converted to cash.

         (e)    Under procedures established by the Administrator, distributions
                under this Paragraph 8.1 may be made under any of the following
                forms of payment, or any combination thereof:

                (i)     Lump sum distribution;
                (ii)    Installment payments, not to exceed 20 years if a
                        specific period is requested; or
                (iii)   Partial withdrawals.

8.2  Death
     -----

         (a)    If a Member or Former Member dies and it is established to the
                Plan's satisfaction that the consent required under Subparagraph
                8.2(c), either has been obtained or was not obtainable, all
                items in the Member's or former Member's Account shall be paid
                to the beneficiary or beneficiaries most recently designated by
                the Member or Former Member in such manner as prescribed by the
                Administrator. If no such designation shall have been made, or
                if all designated beneficiaries should die before the Member or
                former Member, payment shall be made to the Member's or former
                Member's estate.

         (b)    Except as provided in Subparagraph 8.2(c), if a Member or former
                Member is survived by a spouse, all items in the Member's or
                former Member's Account shall be paid to the Member's spouse.

         (c)    If a Member or former Member is survived by a spouse, all items
                in a Member's or former Member's Account shall be paid to the
                beneficiary or beneficiaries most recently designated by the
                Member or former Member in such manner as prescribed by the
                Administrator; provided, (i) the surviving spouse of the Member
                or former Member has irrevocably consented in writing to the
                designation of the specific beneficiary or beneficiaries, which
                designation may not be changed without spousal consent (or the
                spouse expressly permits designations by the Member or Former
                Member without any further spousal consent), such consent
                acknowledged the effect of the election and such consent was
                witnessed by a notary public, or (ii) it is established to the
                Plan's satisfaction that the consent required by Subparagraph
                8.2(c)(i), could not be obtained because the surviving spouse
                could not be located or because of such other circumstances as
                the Secretary of Treasury may by regulation prescribe. Any
                consent necessary under this paragraph shall be effective only
                with respect to such spouse, or, in the event it is established
                that the consent may not be obtained, such designated spouse. A
                revocation of a prior designation may be made by a Member or
                Former Member without the consent of the spouse at any time
                prior to the Member's for Former Member's death. A consent that
                permits

                                      -29-
<PAGE>

                designation by the Member or Former Member without any
                requirement for further consent by the spouse must acknowledge
                that the spouse has the right to limit consent to a specific
                beneficiary and that the spouse voluntarily elects to relinquish
                such right.

         (d)    Payment under this Paragraph 8.2 may be made in any form of
                distribution permitted by Paragraph 8.1; provided, however, that
                all items in the Member's or Former Member's Account shall be
                paid no later than December 31 of the calendar year which
                contains the fifth anniversary of the date of the Member's
                death. Prior to distribution, the beneficiary shall have the
                rights of a Former Member under Section 6 and Paragraph 8.1;
                provided, however, that the beneficiary may not elect
                installments or partial withdrawals under Subparagraphs
                8.1(e)(ii) and (iii) and any Atlantic Richfield Company Stocks
                held under the ESOP Part of the Plan shall be converted to non-
                ESOP Atlantic Richfield Common Stock.

8.3      Disability
         ----------

         (a)    A Member who is determined to be disabled may elect to receive a
                distribution of such Member's Account in accordance with
                Paragraph 8.1.

         (b)    A Member is disabled if as a result of a medically determinable
                physical or mental impairment resulting from illness or injury
                the Member is unable to perform one or more of the substantial
                duties of the Member's normal work assignment with the Company
                or of any work assignment which the Company determines is
                available to the Member and for which the Member is reasonably
                qualified by education, training or experience to perform as
                determined by the Administrator after review by the entity
                designated by the Administrator.

8.4      Divorce
         -------

         To the extent a Qualified Domestic Relations Order ("QDRO"), as defined
         in (S)414(p) of the Code, is received by the Plan, distributions from a
         Member's Account shall be made to an Alternate Payee, as defined in
         (S)414(p) of the Code, as soon as administratively possible following
         the determination of the order's qualified status. Prior to such
         distribution, Atlantic Richfield Common Stock in the ESOP Part of the
         Plan shall be converted to non-ESOP Atlantic Richfield Common Stock.

8.5      Rollover
         --------

         (a)    Notwithstanding anything in this Section 8 to the contrary, a
                distributee, as defined below, may elect, at a time and in the
                manner prescribed by the Administrator, to have all or a portion
                of a distribution under this Section 8, other than any Member
                Contributions and any amount required to be

                                      -30-
<PAGE>

                distributed pursuant to (S)401(a)(9) of the Code, made payable
                to an eligible retirement plan.

         (b)    For purposes of this Section 8, other than Paragraph 8.2, an
                eligible retirement plan is an individual retirement account or
                annuity described in (S)408(a) or (b) of the Code, an annuity
                plan described in (S)403(a) of the Code or a qualified trust
                described in (S)401(a) of the Code that accepts such
                distribution. For purposes of a distribution under Paragraph
                8.2, an eligible retirement plan is an individual retirement
                account or annuity.

         (c)    Distributee means an Member or Former Member, the surviving
                spouse of such Member or such Member's spouse or former spouse
                who is an alternate payee as defined in (S)414(p) of the Code.

8.6      Notice
         ------

         With respect to a Former Member whose account exceeds $5,000, the
         Administrator shall provide the notice required by (S)1.411(a)-11(c) of
         Income Tax Regulations no less than 30 days and no more than 90 days
         before the Former Member's date of distribution; provided, however,
         that such distribution may commence less than 30 days after the
         required notice is given if:

         (a)    The Former Member is informed of the Former Members' right to a
                period of at least 30 days after receiving the notice to
                consider distribution options; and

         (c)    The Former Member, after receiving the notice, affirmatively
                elects a distribution.

         The distribution shall commence no earlier than seven days following
         the date the notice, described above, is provided to the Former Member.

8.7      Distributions
         -------------

         (a)    All distributions required under the Plan shall be determined
                and made in accordance with the proposed regulations under
                (S)401(a)(9) of the Code, including the minimum distribution
                incidental benefit requirement of (S)1.401(a)(9)-2 of the
                proposed regulations.

         (b)    The entire interest of a Member must be distributed or begin to
                be distributed no later than the Member's required beginning
                date. The required beginning date of a Member is the later of
                the April 1 of the calendar year following the calendar year in
                which the Member attains age 70 1/2 or retires, except that
                benefit distributions to a five-percent owner must commence by
                the April 1 of the calendar year following the calendar year in
                which the Member attains age 70 1/2.

                                      -31-
<PAGE>

         (c)    As of the first distribution calendar year, as defined below,
                distributions, if not made in a single-sum, may only be made
                over one of the following periods (or a combination thereof):

                (i)     The life of the Member;
                (ii)    The life of the Member and a designated beneficiary;
                (iii)   A period certain not extending beyond the life
                        expectancy of the Member; or
                (iv)    A period certain not extending beyond the joint and last
                        survivor expectancy of the Member and a designated
                        beneficiary.

         (d)    The amount required to be distributed for each calendar year,
                beginning with distributions for the first distribution calendar
                year, as defined below, must at least equal the quotient
                obtained by dividing the Member's entire Account as of the last
                Valuation Date in the calendar year preceding the distribution
                calendar year, by the applicable life expectancy.

         (e)    The minimum distribution required for the Member's first
                distribution calendar year must be made on or before the
                Member's required beginning date as defined in Subparagraph
                8.7(b). The minimum distribution for other calendar years,
                including the minimum distribution for the distribution calendar
                year in which the Member's required beginning date occurs, must
                be made on or before December 31 of that distribution calendar
                year.

         (f)    If the Member dies after distribution of his or her interest has
                begun on or after the Member's required beginning date, as
                defined in Subparagraph 8.7(b), the remaining portion of such
                interest will continue to be distributed at least as rapidly as
                under the method of distribution being used prior to the
                Member's death.

         (g)    If the Member dies before distribution of his or her interest
                begins, distribution of the Member's entire interest shall be
                completed by December 31 of the calendar year containing the
                fifth anniversary of the participant's death.

         (h)    The life expectancy (or joint and last survivor expectancy)
                shall be calculated in accordance with Treasury regulations.
                Life expectancies shall be recalculated annually.

         (i)    The distribution calendar year is a calendar year for which a
                minimum distribution is required. For distributions beginning
                before the Member's death, the first distribution calendar year
                is the calendar year immediately preceding the calendar year
                which contains the Member's required beginning date.

                                      -32-
<PAGE>

8.8      Distribution of Benefits
         ------------------------

         The distribution of benefits under this Plan to a Member who has
         elected to receive such benefits shall be made not later than the 60th
         day after the latest of the close of the Plan Year in which (a) the
         Member attains age 65 or such earlier normal retirement age as may be
         specified in this Plan; (b) there occurs the tenth anniversary of the
         year in which the Member commenced membership in this Plan; or (c) the
         Member's service with the Company is terminated.

                                      -33-
<PAGE>

                                   SECTION 9
                                LOANS TO MEMBERS
9.1      General
         -------

         A Member, or a Former Member who is a Party-In-Interest as defined in
         Section 3(14) of ERISA, may borrow from his or her Account in
         accordance with the terms and conditions set forth in this Section 9
         and such additional rules, consistent with such terms and conditions,
         which the Administrator may establish from time to time.

9.2      Eligibility
         -----------

         To be eligible to apply for and receive a loan, the Member must be in
         receipt of regular Earnings. The loan shall be irrevocable upon the
         earlier of:

         (a)    Endorsement of the check representing the loan proceeds, or

         (b)    Expiration of ten days from issuance of such check.

9.3      Loan Amount
         -----------

         (a)    The maximum loan shall be the lesser of one half of the Member's
                Account or $50,000 (reduced by the highest balance, at any
                specific time, of any outstanding loan or loans during the
                preceding 12 months from this Plan).

         (b)    A loan must be in cash, in increments of $100 and in an amount
                not less than $1,000.

         (c)    The maximum loan amount shall be reduced to the extent necessary
                to prevent each installment of the loan payment, including
                principal and interest, when added to installments under any
                outstanding loan under the Plan, from exceeding 25 percent of a
                Member's biweekly earnings.

         (d)    The loan amount may not exceed the lesser of (i) the amount of
                the Member's Contributions, Elective Deferrals and Company
                Contributions under the Atlantic Richfield Savings Plans II and
                III made prior to July 1, 1988 (excluding assets which
                originated in the Atlantic Richfield Employee Stock Ownership
                Plan), Matching Contributions under the Union Texas Petroleum
                Savings Plan for Salaried Employees, and earnings thereon at the
                time the loan is made, or (ii) the amount of the security, as
                described hereafter, for the loan.

         (f)    For purposes of this Paragraph 9.3, the value of Common Stock,
                or any other investment alternative will be determined on the
                Valuation Date immediately preceding the date the loan
                application is received by the Administrator under rules
                established by the Administrator.

                                      -34-
<PAGE>

9.4      Number of Loans
         ---------------

         A Member may have such number of loans outstanding at any time as shall
         be determined by the Administrator.

9.5      Interest Rate
         -------------

         A loan shall bear interest at a rate established and communicated by
         the Capital Accumulation Plan Administrative Committee to provide the
         Plan with a rate of return commensurate with prevailing interest rates
         charged on similar commercial loans by persons in the business of
         lending money.

9.6      Security
         --------

         (a)    Each loan must be evidenced by a loan agreement executed by the
                Member for the amount of the loan, including principal and
                interest, payable to the order of the Trustee.

         (b)    Security for the loans shall equal 50 percent of the assets in
                the Member's Account as of the date of the loan request.

         (c)    The assets which constitute security for the loan will be valued
                on the date of the loan agreement, or at such other time as may
                be determined by the Administrator.

9.7      Funding of the Loan
         -------------------

         (a)    The loan will be funded in accordance with procedures
                established by the Administrator.

         (b)    Under procedures established by the Administrator, investment
                alternatives shall be sold to fund the loan.

9.8      Repayment of the Loan
         ---------------------

         (a)    As determined by the Member, but subject to the restriction in
                Subparagraph 9.3(c), a loan may be repaid over a period of one,
                two, three, four or five years or, in the case of a loan used to
                acquire the Member's principal residence, such longer term as
                determined by the Administrator and permitted under (S)72(p) of
                the Code.

         (b)    Principal and interest shall be amortized, on a level basis,
                over the term of the loan.

         (c)    Except as provided below, payments shall be made by means of
                payroll deductions, the authorization of which shall be
                irrevocable.

                                      -35-
<PAGE>

                (i)     The loan may be repaid in full at any time without
                        penalty.

                (ii)    If a Member is not in receipt of regular Earnings
                        sufficient to permit repayment of the loan, or has
                        terminated employment, repayment shall be made by means
                        prescribed by the Administrator.

                Repaid principal and interest shall be credited in accordance
                with the Member's election under Paragraph 6.2.

9.9      Deemed Distribution
         -------------------

         A distribution of the unpaid principal shall be deemed to have been
         made to the Member if the Member fails to make payment under
         Subparagraph 9.8(c) for a period of 90 days.

9.10     Default
         -------

         If the Member is not in receipt of regular Earnings sufficient to
         permit repayment of the loan and does not make manual repayments for a
         period exceeding 90 days, the loan will be deemed in default and the
         Administrator will realize on the security in accordance with
         applicable laws.

                                      -36-
<PAGE>

                                   SECTION 10
                                 ADMINISTRATION
               CAPITAL ACCUMULATION PLAN ADMINISTRATIVE COMMITTEE

10.1     Capital Accumulation Plan Administrative Committee
         --------------------------------------------------

         The Plan shall be administered by a Capital Accumulation Plan
         Administrative Committee. The Committee shall consist of the Senior
         Vice President, Human Resources of Atlantic Richfield Company, who
         shall serve as Chairperson, and not less than two other persons
         appointed by the Chairperson. Members of the Committee shall serve
         without compensation. Vacancies shall be filled by the Chairperson or
         the Chairperson's delegate.

10.2     Rules of Conduct
         ----------------

         The Capital Accumulation Plan Administrative Committee shall adopt such
         rules for the conduct of its business and administration of this Plan
         as it considers desirable; provided, they do not conflict with this
         Plan.

10.3     Legal, Accounting, Clerical
         ---------------------------

         The Capital Accumulation Plan Administrative Committee may authorize
         one or more of its members or any agent to act on its behalf and may
         contract for legal, accounting, clerical and other services to carry
         out this Plan. Unless paid by the Company, all expenses of the Company,
         the Administrator and the Plan shall be paid by the Plan, to the extent
         they constitute reasonable expenses of administering the Plan. The Plan
         may reimburse expenses paid directly by the Company or its designee.
         This provision shall be deemed a part of any contract to provide for
         expenses of Plan administration, whether or not the signatory to such
         contract is, as a matter of convenience, the Company or its designee.
         Notwithstanding the foregoing, brokerage commissions, transfer fees and
         other expenses actually incurred in any sale or purchase of Company
         Common Stock shall be equitably added to the cost or subtracted from
         the proceeds of all purchases or sales.

10.4     Interpretation of Provisions
         ----------------------------

         The Capital Accumulation Plan Administrative Committee shall have full
         discretion and final authority to determine eligibility for benefits
         and to interpret the provisions of this Plan, to decide questions
         arising in its administration, and to establish such other rules for
         its administration as may be desirable.

10.5     Records of Administration
         -------------------------

         The Capital Accumulation Plan Administrative Committee shall keep
         records reflecting the administration of this Plan which shall be
         subject to audit by the

                                      -37-
<PAGE>

         Company. Members may examine records pertaining directly to themselves.
         At least annually, the Capital Accumulation Plan Administrative
         Committee shall have mailed to each Member a statement of his or her
         Account and such statement shall be deemed to have been accepted as
         correct for all purposes of this Plan unless written notice to the
         contrary is received by the Capital Accumulation Plan Administrative
         Committee or the Trustee within 30 days after the date of mailing.

10.6     Claims for Benefits
         -------------------

         Applications for benefits must be made in such manner as prescribed by
         the Administrator. The Administrator shall have full discretion and
         final authority to determine eligibility for benefits and to construe
         the terms of the Plan in acting upon an initial application for
         benefits or an appeal of a denial of an application for benefits. Each
         application shall be acted upon and approved or disapproved within 90
         days following its receipt by the Administrator. In the event special
         circumstances require an extension of time for reviewing the initial
         application for benefits, the Administrator shall make a determination
         as soon as practicable but no later than 180 days following receipt of
         the application. If any application for benefits is denied, in whole or
         in part, the Administrator shall notify the applicant in writing of
         such denial and of the applicant's right to a review by the
         Administrator and shall set forth in a manner calculated to be
         understood by the applicant, specified reasons for such denial,
         specific references to pertinent Plan provisions on which the denial is
         based, a description of any additional material or information
         necessary for the applicant to perfect the application, an explanation
         of why such material or information is necessary, and an explanation of
         the Plan's review procedure.

         Any person, or a duly authorized representative thereof, whose
         application for benefits is denied in whole or in part, may appeal from
         such denial to the Administrator for a review of the decision by
         submitting to the Administrator within 60 days after receiving notice
         of denial, a written statement:

         (a)    Requesting a review of the application for benefits by the
                Administrator;

         (b)    Setting forth all of the grounds upon which the request for
                review is based and any facts in support thereof; and

         (c)    Setting forth any issues or comments which the applicant deems
                relevant to the application.

         The Administrator shall act upon each such appeal application within 60
         days after the later of receipt of the applicant's request for review
         by the Administrator or receipt of any additional materials reasonably
         requested by the Administrator from such applicant. In the event
         special circumstances require an extension of time for reviewing the
         appeal, the Administrator shall make a determination as soon as
         practicable but no later than 120 days following receipt of the appeal.

                                      -38-
<PAGE>

         The Administrator shall make a full and fair review of each such
         application and any written materials submitted by the applicant or the
         Company in connection therewith and may require the Company or the
         applicant to submit within 30 days of written notice by the
         Administrator therefor, such additional facts, documents, or other
         evidence as the Administrator, in its sole discretion, deems necessary
         or advisable in making such a review. The Administrator shall have full
         discretion in making an independent determination of the applicant's
         eligibility for benefits under the Plan and shall have full discretion
         to construe the terms of the Plan in making its review. The decision of
         the Administrator on any application for benefits shall be final and
         conclusive upon all persons.

         If the Administrator denies an application in whole or in part, the
         Administrator shall give written notice of its decision to the
         applicant setting forth in a manner calculated to be understood by the
         applicant the specific reasons for such denial and specific references
         to the pertinent Plan provisions on which the Administrator's decision
         was based.

10.7     Liability of Committee
         ----------------------

         No Member of the Capital Accumulation Plan Administrative Committee
         shall be liable for any action taken in good faith or for the exercise
         of any power given the Capital Accumulation Plan Administrative
         Committee, or for the actions of other members of said Committee unless
         and except to the extent that such liability is imposed under law as a
         result of a breach by such Member of his or her fiduciary
         responsibilities.

10.8     Unlocated Member
         ----------------

         If the Committee is unable, after reasonable and diligent effort, to
         locate a Member, Former Member or beneficiary entitled to payment under
         the Plan, such payment may be forfeited and used to offset Company
         Contributions or to pay Plan expenses. If the Member, Former Member or
         beneficiary later files a claim for benefit, such benefit will be
         reinstated.

10.9     Legal Representative
         --------------------

         The Capital Accumulation Plan Administrative Committee shall act on
         behalf of the Plan with respect to any claim or cause of action,
         whether arising in the course of administrative or judicial proceedings
         or otherwise, and shall be responsible for initiating, pursuing and
         defending any such claim or cause of action involving the Plan.

                                      -39-
<PAGE>

                                   SECTION 11
                    AMENDMENTS, DISCONTINUANCE, LIABILITIES

11.1     Amendment
         ----------

         The Plan may be amended, as follows, provided that the Plan, as
         amended, continues to be for the exclusive benefit of the Members of
         the Plan and that no amendment shall reduce the Account of any Member
         as of the date of such amendment:

         (a)    The Board of Directors of Atlantic Richfield Company shall have
                the sole power to amend the Plan with respect to any change that
                (i) reduces or may reduce, as determined by the Plan counsel,
                the future Member or Company Contribution to the Plan, in any
                manner, except to the extent legally required, as determined by
                the Plan counsel; (ii) increases or may increase, as certified
                by the Plan actuary, Company or Plan expense by an amount
                exceeding $10 million; and (iii) although within the amendment
                power of the ARCO Benefits Committee, has been determined by the
                Benefits Committee to be appropriate for decision by the Board
                of Directors.

         (b)    Except as provided in Subparagraph 11.1(a), the ARCO Benefits
                Committee shall have the power to amend the Plan under the
                following circumstances:

                (i)     Any legally required change, as determined by the Plan
                        counsel.

                (ii)    Any change which is the subject of a collective
                        bargaining agreement.

                (iii)   Any change which is determined by the Administrator,
                        with concurrence of the Plan counsel, to be primarily
                        intended to improve administrative efficiency.

                (iv)    Any change that is the subject of an agreement to which
                        the Company is a party and which pertains to an
                        acquisition, divestiture or similar corporate
                        transaction.

                (v)     Any change which is a consequence of a legally required
                        limitation, as determined by the Plan counsel, affecting
                        the dollar amount or type of contributions or benefits
                        available under the Plan.

                (vi)    Any change which is made in conjunction with a transfer
                        of assets and/or liabilities or merger or spin-off of
                        assets and/or liabilities among plans of the Controlled
                        Group of companies (or former members of such Controlled
                        Group in conjunction with the entity

                                      -40-
<PAGE>

                        ceasing to be a Member of the Controlled Group) of which
                        the Company is a member, as defined in Section 1563 of
                        the Code.

11.2     Termination
         -----------

         Atlantic Richfield Company intends to continue this Plan indefinitely
         but reserves the right to terminate it at any time, by action of its
         Board of Directors. If this Plan is terminated, or if there is a
         complete discontinuance of contributions under this Plan by the
         Company, all amounts credited to Accounts of Members shall be held for
         distribution as provided in Section 8.

11.3     Liability of Company
         --------------------

         The Company shall have no liability for payments under this Plan except
         to make the contributions required by Section 4. Any payments under the
         Plan shall be made solely from the fund held by the Trustee.

                                      -41-
<PAGE>

                                   SECTION 12
                                 MISCELLANEOUS

12.1     Employment
         ----------

         This Plan shall not give any Member any right to be continued in the
         employment of the Company.

12.2     Benefits Not Assignable
         -----------------------

         Except as provided in Paragraph 8.4, no benefit under this Plan shall
         be assignable or transferable in whole or in part, either directly or
         by operation of law or otherwise, and shall not be subject to
         attachment or other process.

12.3     Discharge of Liability
         ----------------------

         If the Administrator deems any person incapable of receiving benefits
         to which such person is entitled under this Plan, by reason of
         minority, illness, infirmity, mental incompetency or other incapacity,
         it may direct the Trustee to make payment directly for the benefit or
         the account of such person or to any eligible person selected by the
         Administrator to disburse such payment whose receipt shall be a
         complete settlement therefor.

12.4     Governing Laws
         --------------

         The Plan shall be governed by and construed in accordance with federal
         laws governing employee benefit plans qualified under the Code or with
         the laws of the State of Delaware to the extent not preempted by
         federal law.

12.5     Limitation on Mergers
         ---------------------

         This Plan may not merge or consolidate with, or transfer any of its
         assets or liabilities to any other plan unless each Member in this Plan
         would, if said other plan were to terminate, receive a benefit
         immediately after the merger, consolidation or transfer which is equal
         to or greater than the benefit such Member would have been entitled to
         receive immediately before the merger, consolidation or transfer if
         this Plan had terminated.

12.6     Delegation of Fiduciary or Administrative Responsibilities
         ----------------------------------------------------------

         Atlantic Richfield Company, by resolution of its Board of Directors or
         by written action of any officer generally or specifically named by
         such a resolution to take such an action, and the Capital Accumulation
         Plan Administrative Committee, by resolution of said Committee, may at
         any time delegate to any other named person or body, or reassume
         therefrom, any of their respective fiduciary responsibilities or
         administrative duties with respect to this Plan, including the power to
         delegate and

                                      -42-
<PAGE>

         reassume such responsibilities and duties by written action naming the
         person or body to whom the responsibility has been delegated. However,
         only the immediate delegate of Atlantic Richfield Company, the Capital
         Accumulation Plan Administrative Committee, or of the Treasurer of
         Atlantic Richfield Company, as the case may be, may, if so authorized
         by Atlantic Richfield Company, said Committee or said Treasurer,
         delegate any such responsibilities or duties.

12.7     Named Fiduciary
         ---------------

         The named fiduciary with respect to this Plan is Atlantic Richfield
         Company except that (a) as to any matter specified in this Plan as
         being the responsibility or function of the Capital Accumulation Plan
         Administrative Committee, the named fiduciary is said Committee, (b) as
         to any matter specified in the Plan or in the Trust Agreement as being
         the responsibility or function of the Trustee or the Investment
         Officer, the named fiduciary is the Trustee or the Investment Officer,
         as the case may be, and (c) as to any matter specified in the Plan as
         being the responsibility or function of the Treasurer of Atlantic
         Richfield Company, the named fiduciary is such Treasurer.

                                      -43-
<PAGE>

                                   SECTION 13
                                   ROLLOVERS

13.1     Rollovers from Other Qualified Plans
         ------------------------------------

         An Employee who has had distributed to the Employee all or a portion of
         his or her taxable interest in a plan meeting the requirements of
         (S)401(a) of the Code, including a defined benefit retirement plan of
         the Company or a Subsidiary or Affiliate, (the "Other Plan") may, in
         accordance with procedures approved by the Capital Accumulation Plan
         Administrative Committee, rollover in cash all or a portion of the
         taxable distribution received from the Other Plan to the Plan, provided
         the following conditions are met:

         (a)    The rollover occurs on or before the 60th day after the Member
                receives the distribution from the Other Plan;

         (b)    The distribution from the Other Plan qualifies as an eligible
                rollover distribution within the meaning of (S)402(c)(4) of the
                Code; and

         (c)    The amount rolled over does not exceed the maximum amount which
                may be rolled over in accordance with (S)402(c)(2) of the Code.

13.2     Transfers From Individual Retirement Accounts
         ---------------------------------------------

         An Employee who receives a distribution from an individual retirement
         account described in (S)408(a) of the Code or an individual retirement
         annuity described in (S)408(b) of the Code which constitutes the entire
         amount of such account or annuity (including earnings thereon), and no
         portion of which is attributable to any source other than a
         distribution from a qualified plan described in Paragraph 13.1, may, in
         accordance with procedures approved by the Capital Accumulation Plan
         Administrative Committee, rollover in cash all or a portion of such
         distribution to the Plan, within 60 days after receiving the
         distribution.

13.3     Membership
         ----------

         Notwithstanding anything in the Plan to the contrary, an Employee who
         rolls over funds to the Plan pursuant to Paragraph 13.1 or 13.2, shall,
         upon such rollover, become a Member of the Plan except that the right
         to make Elective Deferrals, Member Contributions or receive Company
         Contributions will remain subject to Paragraph 2.1.

13.4     Administration
         --------------

         The Administrator shall develop such procedures, including procedures
         for obtaining information from an Employee desiring to make such a
         transfer, as it deems necessary or desirable to enable it to determine
         that the proposed rollover

                                      -44-
<PAGE>

         will meet the requirements of this section. Upon approval by the
         Capital Accumulation Plan Administrative Committee, the rollover shall
         be deposited with the Trustee in the Employee's Rollover Account.

                                      -45-
<PAGE>

                                   SECTION 14
                              TOP HEAVY PROVISIONS

If the Plan is or becomes Top Heavy in any Plan Year, the provisions of this
Section 14 will supersede any conflicting provisions in the Plan.

14.1     Definitions
         -----------

         (a)    Key Employee means an Employee, former Employee or an Employee's
                ------------
                beneficiary who at any time during the determination period is:

                (i)     An officer of the Company who has annual Compensation
                        greater than 50 percent of the amount in effect under
                        (S)415(b)(1)(A) of the Code for the Plan Year;

                (ii)    One of the ten Employees owning (or considered as owning
                        within the meaning of (S)318 of the Code) the largest
                        interest in the Company; provided, such Employee's
                        annual Compensation from the Company exceeds the dollar
                        limitation under (S)415(c)(1)(A) of the Code. If two or
                        more Employees have the same ownership interest, the
                        Employee with the greater annual Compensation from the
                        Company for the Plan Year shall be considered to own the
                        larger interest in the Company;

                (iii)   A five percent owner of the Company; or

                (iv)    A one percent owner of the Company who has annual
                        Compensation from the Company of more than $150,000.

                The determination period of the Plan is the Plan Year containing
                the Determination Date and the four preceding Plan Years.

                The determination of who is a Key Employee will be made in
                accordance with (S)416(i)(1) of the Code and the regulations
                thereunder.

         (b)    Top Heavy Plan: For any Plan Year after December 31, 1983, this
                --------------
                Plan is Top Heavy if any of the following conditions exist:

                (i)     If the Top Heavy Ratio for this Plan exceeds 60 percent
                        and this Plan is not part of any Required Aggregation
                        Group or Permissive Aggregation Group of plans;

                (ii)    If this Plan is a part of a Required Aggregation Group
                        of plans (but which is not part of a Permissive
                        Aggregation Group) and the Top Heavy Ratio for the group
                        of plans exceeds 60 percent; or

                                      -46-
<PAGE>

                (iii)   If this Plan is a part of a Required Aggregation Group
                        of plans and part of a Permissive Aggregation Group and
                        the Top Heavy Ratio for the Permissive Aggregation Group
                        exceeds 60 percent.

         (c)    Top Heavy Ratio
                ---------------

                (i)     If the Company maintains one or more defined
                        contribution plans (including any Simplified Employee
                        Pension Plan) and the Company has not maintained any
                        defined benefit plan which during the five- year period
                        ending on the Determination Date(s) has or has had
                        accrued benefits, the Top Heavy Ratio for this plan
                        alone or for the Required or Permissive Aggregation
                        Group as appropriate is a fraction, the numerator of
                        which is the sum of the account balances of all Key
                        Employees as of the Determination Date(s) [including any
                        part of any account balance distributed in the five-year
                        period ending on the Determination Date(s)], and the
                        denominator of which is the sum of all account balances
                        [including any part of any account balance distributed
                        in the five-year period ending on the Determination
                        Date(s)], both computed in accordance with (S)416 of the
                        Code and the regulations thereunder. Both the numerator
                        and denominator of the Top Heavy Ratio are adjusted to
                        reflect any contribution not actually made as of the
                        Determination Date, but which is required to be taken
                        into account on that date under (S)416 of the Code and
                        the regulations thereunder.

                (ii)    If the Company maintains one or more defined
                        contribution plans (including any Simplified Employee
                        Pension Plan) and the Company maintains or has
                        maintained one or more defined benefit plans which
                        during the five-year period ending on the Determination
                        Date(s) has or has had any accrued benefits, the Top
                        heavy Ratio for any Required or Permissive Aggregation
                        Group as appropriate is a fraction, the numerator of
                        which is the sum of account balances under the
                        aggregated defined contribution plan or plans for all
                        Key Employees, determined in accordance with
                        Subparagraph 14.1(c)(i), and the Present Value of
                        accrued benefits under the aggregated defined benefit
                        plan or plans for all Key Employees as of the
                        Determination Date(s), and the denominator of which is
                        the sum of the account balances under the aggregated
                        defined contribution plan or plans for all Members,
                        determined in accordance with Subparagraph 14.1(c)(i),
                        and the Present Value of accrued benefits under the
                        defined benefit plan or plans for all Members as of the
                        Determination Date(s), all determined in accordance with
                        (S)416 of the Code and the regulations thereunder. The
                        accrued benefits under a defined benefit plan in both
                        the numerator and denominator of the Top Heavy Ratio are
                        adjusted for any distribution of an accrued benefit made
                        in the five-year period ending on the Determination

                                      -47-
<PAGE>

                        Date.

                (iii)   For purposes of Subparagraphs 14.1(c)(i) and (c)(ii),
                        the value of account balances and the Present Value of
                        accrued benefits will be determined as of the most
                        recent Valuation Date that falls within or ends with the
                        12-month period ending on the Determination Date except
                        as provided in (S)416 of the Code and the regulations
                        thereunder for the first and second Plan Years of a
                        defined benefit plan. The account balances and accrued
                        benefits of a Member (A) who is not a Key Employee but
                        who was a Key Employee in a prior-year, or (B) effective
                        January 1, 1985, who has not been credited with at least
                        one Hour of Service with a Company maintaining the Plan
                        at any time during the five-year period ending on the
                        Determination Date will be disregarded. The calculation
                        of the Top Heavy Ratio, and the extent to which
                        distributions, rollovers and transfers are taken into
                        account will be made in accordance with (S)416 of the
                        Code and the regulations thereunder. Deductible Member
                        Contributions will not be taken into account for
                        purposes of computing the Top Heavy Ratio. When
                        aggregating plans, the value of account balances and
                        accrued benefits will be calculated with reference to
                        the Determination Dates that fall within the same
                        calendar year.

                (iv)    The accrued benefit of a Member other than a Key
                        Employee shall be determined under the method, (A) if
                        any, that uniformly applies for accrual purposes under
                        all defined benefit plans maintained by the Company, or
                        (B) absent such method, as if such benefits accrued not
                        more rapidly than the slowest accrued rate permitted
                        under the fractional rule of (S)411(b)(1)(C) of the
                        Code.

         (c)    Permissive Aggregation Group: The Required Aggregation Group of
                ----------------------------
                plans plus any other plan or plans of the Company which, when
                considered as a group with the Required Aggregation Group, would
                continue to satisfy the requirements of (S)401(a)(4) and (S)410
                of the Code.

         (e)    Required Aggregation Group means:
                --------------------------

                (i)     Each qualified plan of the Company in which at least one
                        Key Employee participates or participated at any time
                        during the determination period (regardless of whether
                        the plan terminated); and

                (ii)    Any other qualified plan of the Company which enables a
                        plan described in Subparagraph 14.1(e)(i) to meet the
                        requirements of (S)401(a)(4) or (S)410 of the Code.

                                      -48-
<PAGE>

         (f)    Determination Date means for any Plan Year the last day of the
                ------------------
                preceding Plan Year. For the first Plan Year of the Plan, the
                last day of that year.

         (g)    Valuation Date means December 31 of each year.
                --------------

         (h)    Present Value: Present Value shall be based on interest rate and
                -------------
                the mortality tables specified in the Company's defined benefit
                plan.

         (i)    Compensation means all compensation, as that term is defined for
                ------------
                (S)415 purposes, but including amounts contributed by the
                Company pursuant to Employee Contribution Agreements which are
                excludable from the Employee's income under Code (S)125,
                (S)402(e)(3), (S)402(h) and (S)403(b).

14.2     Minimum Allocation
         ------------------

         (a)    Except as otherwise provided in Subparagraphs 14.2(b), (c) and
                (d), the Company Contribution allocated on behalf of any Member
                who is not a Key Employee shall not be less than the lesser of
                three percent of such Member's Compensation or in the case where
                the Company has no defined benefit plan which designates this
                Plan to satisfy (S)401 of the Code, the largest percentage of
                Company Contribution, as a percentage of the first $150,000 of
                the Key Employee's Compensation, allocated on behalf of any Key
                Employee for that year. The minimum allocation is determined
                without regard to any Social Security contribution. This minimum
                allocation shall be made even though, under other Plan
                provisions, the Member would not otherwise be entitled to
                receive an allocation, or would have received a lesser
                allocation for the year because of (i) the Member's failure to
                complete 1,000 Hours of Service, or (ii) the Member's failure to
                make mandatory Member Contributions to the Plan, or (iii)
                Compensation less than a stated amount.

         (b)    The provision in Subparagraph 14.2(a), shall not apply to any
                Member who was not employed by the Company on the last day of
                the Plan Year.

         (c)    If Members of this Plan are covered by one or more defined
                benefit plans maintained by the Company or its Subsidiaries, the
                minimum allocation or benefit requirements applicable to Top
                Heavy plans shall first be met by such defined benefit plan or
                plans.

         (d)    If Members of this Plan are covered by one or more defined
                contribution plans maintained by the Company or its
                Subsidiaries, and are not covered by any defined benefit plans
                of the Company or its Subsidiaries, the minimum allocation
                requirement will be met by the defined contribution plan in
                which the Employee is an active Member in the following order:

                                      -49-
<PAGE>

                1.  Money Purchase Pension Plan
                2.  Profit Sharing Plan, and
                3.  Stock Bonus Plan

         (e)    For purposes of satisfying the minimum allocation requirements
                of this Paragraph 14.2, Elective Deferrals and Matching
                Contributions may not be taken into account.

14.3     The minimum accrued benefit required [to the extent required to be
         nonforfeitable under (S)416(b)] may not be suspended or forfeited under
         Code (S)411(a)(3)(B) or (S)411(a)(3)(D).

14.4     For any Plan Year in which the Plan is Top Heavy, only the first
         $150,000 (or such larger amount as may be prescribed by the Secretary
         of Treasury or the Secretary's delegate) of each Member's annual
         Compensation will be taken into account for purposes of determining
         benefits under the Plan.

14.5     In any Plan Year in which the Top Heavy Ratio exceeds 60 percent the
         denominators of the defined benefit fraction and defined contribution
         fraction [as previously defined in the Plan] shall be computed using
         100 percent of the dollar limitation instead of 125 percent. The
         preceding sentence shall not apply to an Employee so long as there are
         no:

         (a)    Company Contribution, forfeitures or voluntary nondeductible
                contributions allocated to such Employee, or

         (b)    Accruals for such Employee under any qualified defined benefit
                plan.

14.6     In determining the highest rate of contribution applicable to any Key
         Employee, amounts that such Key Employee elects to defer under an
         arrangement qualified under (S)401(k) of the Code will be counted for
         the purposes of (S)416 of the Code.

                                      -50-
<PAGE>

                               ATLANTIC RICHFIELD
                           CAPITAL ACCUMULATION PLAN



To record the adoption of the amended and restated Atlantic Richfield Capital
Accumulation Plan, effective March 15, 1999, the undersigned, being duly
authorized to act on behalf of Atlantic Richfield Company has executed this plan
document at Los Angeles, California on the 23 day of March, 1999.



ATTEST:            ATLANTIC RICHFIELD COMPANY



BY:   [Richard J. Anderson]                 BY:    [John H. Kelly]
    ---------------------------                  -------------------------------
                                                    John H. Kelly
                                                    Senior Vice President
                                                    Human Resources

                                      -51-

<PAGE>

                                                                    Exhibit 10.2

CH-Twenty, Inc.


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

CH-TWENTY, INC.
CAPITAL ACCUMULATION PLAN


Amendment and Restatement
Effective As Of March 15, 1999
<PAGE>

                                CH-Twenty, Inc.
                           CAPITAL ACCUMULATION PLAN
                               TABLE OF CONTENTS
                               -----------------
<TABLE>
<CAPTION>
                                                                                 Page No.
<S>                                                                                   <C>
INTRODUCTION........................................................................  1

Section 1 - DEFINITION
- ---------
          1.1   Acquisition Loan...................................................   2
          1.2   Administrator......................................................   2
          1.3   Annual Earnings or Earnings........................................   2
          1.4   Capital Accumulation Plan Administrative Committee.................   2
          1.5   Code...............................................................   2
          1.6   Company............................................................   2
          1.7   Credited Company Service...........................................   2
          1.8   Effective Date.....................................................   2
          1.9   Elective Deferrals or Deferrals....................................   2
         1.10   Employee...........................................................   2
         1.11   Employee Contribution Agreement....................................   3
         1.12   ERISA..............................................................   3
         1.13   Financed Shares....................................................   3
         1.14   Former Member......................................................   3
         1.15   Highly Compensated Employee........................................   3
         1.16   Hour of Service....................................................   4
         1.17   Matching Contributions.............................................   5
         1.18   Member.............................................................   5
         1.19   Member's Account or Account........................................   5
         1.20   Member Contributions...............................................   6
         1.21   Plan or Plans......................................................   6
         1.22   Plan Year..........................................................   6
         1.23   Subsidiary or Affiliate............................................   6
         1.24   Trust Agreement....................................................   6
         1.25   Trustee............................................................   6
         1.26   Valuation Date.....................................................   6

Section 2 - MEMBERSHIP - ELIGIBILITY
- ---------
          2.1   Membership.........................................................   7
          2.2   Notice to Administrator............................................   7
          2.3   Membership Termination.............................................   7
          2.4   Member Suspension..................................................   8
          2.5   Member Transfers...................................................   8
          2.6   Capital Accumulation Plan Assets...................................   8
</TABLE>

                                       i
<PAGE>

<TABLE>
<CAPTION>
Section 3 - MEMBERS' ELECTIVE DEFERRALS
- ---------
<S>                                                                                  <C>
          3.1   Members' Elections................................................   10
          3.2   Contribution of Elective Deferrals and Member Contributions.......   11
          3.3   Annual Dollar Limitation..........................................   11
          3.4   Actual Deferral Percentage Tests..................................   12
          3.5   Distribution of Excess Aggregate Contributions....................   12
          3.6   Make-Up Elective Deferrals and Member Contributions...............   13

Section 4 -  COMPANY CONTRIBUTION
- ---------
          4.1   Matching Contribution.............................................   14
          4.2   Form of Contribution..............................................   14
          4.3   Members Excluded From Contribution................................   14
          4.4   Actual Contribution Percentage Test...............................   14
          4.5   Distribution of Excess Contributions..............................   15
          4.6   Limitation on the Multiple Use Alternative........................   16
          4.7   Section 415 Limitations...........................................   16
          4.8   Nonelective Contributions.........................................   17
          4.9   Exclusive Benefit.................................................   17

Section 5 - FINANCED SHARES
- ---------
          5.1   Acquisition Loans.................................................   18
          5.2   Payments on Acquisition Loan......................................   19

Section 6 - INVESTMENT OF MEMBERS' AND FORMER MEMBERS' ACCOUNTS
- ---------
          6.1   Members' and Former Members' Accounts.............................   21
          6.2   Investment of Elective Deferrals,Member Contribution, Rollovers
                  and Certain Matching Contributions..............................   21
          6.3   Investment of Company Contributions...............................   21
          6.4   Member or Former Member Direction of Investments..................   22
          6.5   Allocation of Investment Experience...............................   22
          6.6   Manner and Time of Debiting Distributions.........................   22
          6.7   Title of Investments..............................................   22
          6.8   Voting of Investments.............................................   22
          6.9   Voting of Atlantic Richfield Company Common Stock.................   23
         6.10   Allocation of Dividends on Atlantic Richfield Company
                  Common Stock....................................................   24
         6.11   Investment Advisory Fees..........................................   24
         6.12   Member or Former Member Protection................................   24
         6.13   Confidentiality...................................................   24

Section 7 - WITHDRAWALS DURING EMPLOYMENT
- ---------
          7.1   Age 59 1/2 Withdrawal.............................................   25
          7.2   Application and Basis for Hardship Withdrawal.....................   25
          7.3   Partial Withdrawals of Member Contributions.......................   26
</TABLE>

                                       ii
<PAGE>

<TABLE>
<CAPTION>
Section 8 - PAYMENTS ON TERMINATION OF MEMBERSHIP OR OTHER REASONS
- ---------
<S>                                                                                 <C>
          8.1   Termination of Membership.........................................   27
          8.2   Death.............................................................   28
          8.3   Disability........................................................   29
          8.4   Divorce...........................................................   29
          8.5   Rollover..........................................................   29
          8.6   Notice............................................................   30
          8.7   Distributions.....................................................   30
          8.8   Distribution of Benefits..........................................   32

Section 9 - LOANS TO MEMBERS
- ---------
          9.1   General...........................................................   33
          9.2   Eligibility.......................................................   33
          9.3   Loan Amount.......................................................   33
          9.4   Number of Loans...................................................   34
          9.5   Interest Rate.....................................................   34
          9.6   Security..........................................................   34
          9.7   Funding of the Loan...............................................   34
          9.8   Repayment of the Loan.............................................   34
          9.9   Deemed Distribution...............................................   35
         9.10   Default...........................................................   35

Section 10 - CAPITAL ACCUMULATION ADMINISTRATIVE COMMITTEE
- ----------
         10.1   Capital Accumulation Plan Administrative Committee................   36
         10.2   Rules of Conduct..................................................   36
         10.3   Legal, Accounting, Clerical.......................................   36
         10.4   Interpretation of Provisions......................................   36
         10.5   Records of Administration.........................................   37
         10.6   Claims for Benefits...............................................   37
         10.7   Liability of Committee............................................   38
         10.8   Unlocated Member..................................................   38
         10.9   Legal Representative..............................................   38

Section  11 - AMENDMENTS, DISCONTINUANCE, LIABILITIES
- -----------
         11.1   Amendment.........................................................   40
         11.2   Termination.......................................................   40
         11.3   Liability of Company..............................................   40

Section 12 - MISCELLANEOUS
- ----------
         12.1   Employment........................................................   41
         12.2   Benefits Not Assignable...........................................   41
         12.3   Discharge of Liability............................................   41
         12.4   Governing Laws....................................................   41
         12.5   Limitation on Mergers.............................................   41
         12.6   Delegation of Fiduciary or Administrative Responsibilities........   41
</TABLE>

                                      iii
<PAGE>

<TABLE>
<S>                                                                                  <C>
         12.7   Named Fiduciary...................................................   42

Section 13 - ROLLOVERS
- ----------
         13.1   Rollovers from Other Qualified Plans..............................   43
         13.2   Transfers from Individual Retirement Accounts.....................   43
         13.3   Membership........................................................   43
         13.4   Administration....................................................   43

Section 14 - TOP HEAVY PROVISIONS
- ----------
         14.1   Definitions.......................................................   45
         14.2   Minimum Allocation................................................   48
         14.3   ..................................................................   49
         14.4   ..................................................................   49
         14.5   ..................................................................   49
         14.6   ..................................................................   49
</TABLE>

                                       iv
<PAGE>

                                CH-Twenty, Inc.
                           CAPITAL ACCUMULATION PLAN

                                  INTRODUCTION

This Plan is intended to qualify as a Stock Bonus Plan under (S)401(a) of the
Internal Revenue Code of 1986, as amended, and as a Qualified Cash or Deferred
Arrangement under (S)401(k) of the Code.  Part of the Plan (the "ESOP Part") is
intended to qualify as an Employee Stock Ownership Plan under (S)4975(e)(7) of
the Code and such part is designed to invest primarily in Atlantic Richfield
Company Common Stock.

Effective March 14, 1999, the CH-Twenty, Inc. Savings Plan is merged into the
CH-Twenty, Inc. Capital Accumulation Plan.

The class of employees eligible to participate in this Plan previously
participated in the Atlantic Richfield Capital Accumulation Plan II and the
Atlantic Richfield Savings Plan II.  The assets and liabilities of the Atlantic
Richfield Capital Accumulation Plan II and the Atlantic Richfield Savings Plan
II allocable as of June 30, 1997 to the participants in the CH-Twenty, Inc.-
Twenty, Inc. Capital Accumulation Plan and CH-Twenty, Inc.-Twenty, Inc. Savings
Plan who commence participation effective July 1, 1997 were transferred to such
plan.

This amendment and restatement of the Plan is effective March 15, 1999, except
as otherwise indicated, and is intended to bring the Plan into compliance with
the Uniformed Services Employment and Re-employment Act of 1994, Small Business
Protection Act of 1996, subsequent legislation, and relevant regulations and
rulings.  The provisions of this amended and restated plan apply to persons who
are employed on or after March 15, 1999, unless otherwise indicated.

                                      -1-
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                                   SECTION 1
                                  DEFINITIONS

1.1   "Acquisition Loan"  means a loan or other extension of credit used by the
      Trustee to finance the acquisition of Atlantic Richfield Company Common
      Stock.

1.2   "Administrator"  means the Capital Accumulation Plan Administrative
      Committee.

1.3   "Annual Earnings" or "Earnings" means the annual, actual wages or salary
      paid to a Member for the Member's personal service, including the amount
      of any Employee contribution pursuant to (S)125 and (S)401(k) of the Code,
      as amended, but excluding extra pay such as overtime, premiums, bonuses,
      living or other allowances. Annual Earnings shall not exceed a Member's
      regular wages or salary as determined by the Company. Annual Earnings or
      Earnings shall not exceed $160,000, as adjusted each Plan Year pursuant to
      (S)401(a)(17)(B) of the Code.

1.4   "Capital Accumulation Plan Administrative Committee" means the committee
      provided for in Section 10 of this Plan.

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

1.6   "Company" means CH-Twenty, Inc. and such of its Subsidiaries or Affiliates
      whose Employees are included in this Plan upon authorization of CH-Twenty,
      Inc. and adoption of this Plan by such authorized Subsidiary or Affiliate.

1.7   "Credited Company Service" means service with the Company, a predecessor
      company, and/or a Subsidiary or Affiliate which service the Company
      recognizes, on a basis uniformly applicable to all persons similarly
      situated, for purposes of this Plan.

1.8   "Effective Date" means the effective date of this amended and restated
      Plan which is March 15, 1999, unless otherwise indicated.

1.9   "Elective Deferrals" or "Deferrals"  means reductions pursuant to an
      Employee Contribution Agreement of a Member's Annual Earnings, which
      amounts are transferred by the Company to the Trustee of the Plan.

1.10  "Employee"  means any person who is employed by the Company, excluding:

      (a)  Casual Employees, Project Employees and Leased Employees, as defined
           under the Company's Employment Status Classification Policy;

      (b)  Employees represented by any collective bargaining agent which has
           not negotiated the benefits of this Plan; and

                                      -2-
<PAGE>

      (c)  Any division or group of employees which is expressly excluded from
           eligibility for the Plan by action of the Board of Directors of the
           Company.

1.11  "Employee Contribution Agreement" means an agreement entered into between
      the Member and the Company, and by which the Member agrees to accept a
      reduction in Earnings from the Company equal to any whole (or fractions,
      as required by adjustments under Paragraph 3.3, 3.4 or 4.4) percentage,
      per payroll period. This reduction may be on a pre-tax or after-tax basis,
      as elected by the Member. This agreement shall apply to each payroll
      period during the period it is in effect in which the Member receives
      Earnings. In consideration of such agreement, the Company will transfer to
      the Member's pre-tax Elective Deferral subaccount or to the Member's
      after-tax Member Contribution subaccount, as applicable, the amount of the
      Elective Deferrals or Member Contributions at the time that regular salary
      payments are made to its Employees.

1.12  "ERISA"  means the Employee Retirement Income Security Act of 1974.

1.13  "Financed Shares"  means shares of Atlantic Richfield Company Common Stock
      acquired by the Trustee with the proceeds of an Acquisition Loan.

1.14  "Former Member" means a Member whose membership has terminated pursuant to
      Paragraph 2.3 and whose account has not been fully distributed.

1.15  "Highly Compensated Employee", effective July 1, 1997, means:

      (a) Any employee who performs service during the determination year and is
          described in one or more of the following groups:

          (i)  An employee who is a five percent owner, as defined in
               (S)416(i)(1) of the Code, at any time during the determination
               year or the look-back year, as defined below; or

          (ii) An employee who receives compensation in excess of $80,000, as
               adjusted pursuant to (S)415(d) of the Code during the look-back
               year and is a member of the top-paid group as defined in Section
               414(q)(3) of the Code.

      (b) For purposes of the definition of Highly Compensated Employee the
          following will apply:

          (i)   The determination year is the Plan Year for which the
                determination of who is highly compensated is being made.

          (ii)  The look-back year is the 12-month period immediately preceding
                the determination year; provided, however, that for the Plan
                Year

                                      -3-
<PAGE>

                beginning March 15, 1999, the look-back year shall be the
                calendar beginning January 1, 1999.

          (iii) Employers aggregated under (S)414(b), (c), (m), or (o) of the
                Code are treated as a single employer.

          (iv)   Compensation, for purposes of this Paragraph 1.16 means
                 compensation within the meaning of (S)415(c)(3) of the Code
                 without regard to (S)125, (S)402(e)(3) and (S)402(h)(1)(B) of
                 the Code.

      (c) A former Employee who has a separation year prior to the
          determination year and who was a highly compensated active employee
          for either (i) such employee's separation year, or (ii) any
          determination year ending on or after the employee's 55th birthday
          will be a Highly Compensated Employee.  Generally, a separation year
          is the determination year the employee separates from service.  An
          employee who separated from service before January 1, 1987, will be
          included as a Highly Compensated Employee only if the Employee was a
          five percent owner or received compensation in excess of $50,000
          during the year.

1.16  "Hour of Service"  means:

      (a) Each hour for which an Employee is paid, or entitled to payment,
          for the performance of duties for the Company or any Subsidiary or
          Affiliate during the computation period in which the duties are
          performed.

      (b) Each hour for which an Employee is paid, or entitled to payment,
          by the Company or any Subsidiary or Affiliate on account of a period
          of time during which no duties are performed (irrespective of whether
          the employment relationship has terminated) due to vacation, holiday,
          illness, incapacity (including disability), layoff, jury duty,
          military duty or leave of absence.

      (c) Each hour for which back pay, irrespective of mitigation of
          damages, is either awarded or agreed to by the Company or any
          Subsidiary or Affiliate. Such hours shall be credited to the Employee
          for the computation period or periods to which the award or agreement
          pertains.

      (d) An Employee will be credited with 200 Hours of Service, to the
          extent required by Federal law, for each month during which the
          Employee is on active duty in the Armed Forces of the United States
          and for which the Employee is not paid or entitled to be paid by the
          Company or any Subsidiary or Affiliate.

                                      -4-
<PAGE>

      (e) Hours credited for any period under any provision of this
          Paragraph 1.17 may not also be credited for the same period under any
          other provisions of this Plan.  Hours shall be credited under
          Subparagraphs 1.17(a) thru (c) pursuant to U.S. Department of Labor
          Regulations under 29CFR (S)2530.200b-2, which are incorporated herein
          by this reference.

      (f) For all purposes under the Plan, an Employee shall be credited with
          200 Hours of Service for each calendar month in which the Employee
          would otherwise be credited with one or more Hours of Service.

      (g) Solely for purposes of determining whether a break in service has
          occurred in a computation period, and to the extent it does not
          duplicate Hours of Service credited under any other provision of this
          Paragraph 1.17, an individual who is absent from work for maternity or
          paternity reasons shall receive credit for the Hours of Service which
          would otherwise have been credited to such individual but for such
          absence, or in any case in which such hours cannot be determined,
          eight Hours of Service per day of such absence.  For purposes of this
          subparagraph, an absence from work for maternity or paternity reasons
          means an absence which commences on or after January 1, 1985, and is
          (i) by reason of the pregnancy of the individual; (ii) by reason of a
          birth of a child of the individual; (iii) by reason of the placement
          of a child with the individual in connection with the adoption of the
          child by such individual; or (iv) for purposes of caring for such
          child for a period beginning immediately following such birth or
          placement.  The Hours of Service credited under this subparagraph
          shall be credited within the computation period in which the absence
          begins if the crediting is necessary to prevent a break in service in
          that period, or in all other cases, in the following computation
          period.

1.17  "Matching Contributions"  means the Company contribution pursuant to
      Paragraph 4.1 of the Plan.

1.18  "Member"  means an Employee who has qualified for membership in accordance
      with the requirements of this Plan and whose membership has not terminated
      in accordance with Paragraph 2.3 of the Plan.

1.19  "Member's Account" or "Account"  means a separate account maintained by
      the Trustee for each Member consisting of (a) one subaccount to which is
      allocated the Member's Elective Deferrals, as adjusted for earnings and
      withdrawals, and realized and unrealized gains and losses attributable
      thereto; (b) a second subaccount to which is allocated Member
      Contributions as adjusted for earnings and withdrawals, and realized and
      unrealized gains and losses attributable thereto; (c) a third subaccount
      to which is allocated the Company's contributions as adjusted for earnings
      and withdrawals, and realized and unrealized gains and losses attributable
      thereto; and (d) a fourth subaccount to which is allocated

                                      -5-
<PAGE>

      rollovers pursuant to Section 13 and transfers pursuant to Subparagraph
      2.6(b) as adjusted for earnings and withdrawals, and realized and
      unrealized gains and losses attributable thereto.

1.20  "Member Contributions"  means after-tax reductions in the Member's Annual
      Earnings pursuant to an Employee Contribution Agreement, which amounts are
      transferred by the Company to the Trustee.

1.21  "Plan" or "Plans"  means the CH-Twenty, Inc. Capital Accumulation Plan as
      set forth herein, and any amendments thereto.

1.22  "Plan Year"  means the period commencing on March 15, 1999 and ending on
      December 31, 1999.  Thereafter, the Plan Year shall be the calendar year.

1.23  "Subsidiary" or "Affiliate"  means:

      (a) Any corporation 50 percent or more of the voting stock of which is
          owned directly or indirectly by Atlantic Richfield Company or a
          Subsidiary or Affiliate; or

      (b) Any partnership, joint venture or similar organization 50 percent or
          more of the profits interest or capital interest of which is owned
          directly or indirectly by Atlantic Richfield Company or a Subsidiary
          or Affiliate.

1.24  "Trust Agreement"  means the agreement of trust between the Trustee and
      CH-Twenty, Inc. to hold contributions from the Company, Deferrals and
      Member Contributions of Members, transfers and rollovers, and investments
      thereof and earnings thereon.

1.25  "Trustee"  means the persons or corporations, or both, designated by the
      Trust Agreement.  The duties and responsibilities of the Trustee shall be
      those set forth in the Trust Agreement.

1.26  "Valuation Date" means the date or dates established by the Administrator
      for the valuation of the assets of the Plan.  In no event shall the assets
      of the Plan be valued less frequently than once each Plan Year.

                                      -6-
<PAGE>

                                   SECTION 2
                            MEMBERSHIP - ELIGIBILITY

2.1   Membership
      ----------

      (a) Elective Deferrals and Member Contributions -  An Employee who is paid
          -------------------------------------------
          on the United States dollar payroll of the Company may become a Member
          and make Elective Deferrals and/or Member Contributions on or after
          the Employee's date of employment.

          To become a Member, an Employee must enter into an Employee
          Contribution Agreement in accordance with Section 3.

      (b) Company Contributions -  An Employee who is paid on a United States
          ---------------------
          dollar payroll of the Company shall be eligible for Matching
          Contributions with respect to Elective Deferrals on the earlier of (i)
          or (ii) below:

          (i)   Completion of six months of Credited Company Service, or

          (ii)  The end of any 12-consecutive-month period during which the
                Employee completes at least 1,000 Hours of Service. Such 12-
                consecutive-month period shall commence on the Employee's date
                of employment or any anniversary thereof.

2.2   Notice to Administrator
      -----------------------

      The Company shall advise the Administrator as to the date an Employee
      becomes a Member. In the event that any question arises as to the
      eligibility of any Employee, the decision of the Administrator as to such
      Employee's eligibility shall be binding upon the Company, the Employees,
      the Members, the beneficiaries, and any and all other persons having or
      claiming any interest hereunder.

2.3   Membership Termination
      ----------------------

      (a)  An Employee's membership shall terminate upon:

           (i)   Death, disability, dismissal, retirement or termination of
                 employment for any other reason;

           (ii)  Continuation of a Participant's employment with an acquiring
                 corporation in conjunction with a sale to the acquiring
                 corporation of substantially all of the assets used by the
                 Company or any Subsidiary or Affiliate in a trade or business
                 which such entity conducts; or

                                      -7-
<PAGE>

           (iii) A disposition of the Company's interest in a Subsidiary or
                 Affiliate when the Participant continues employment with such
                 Subsidiary or Affiliate.

      (b)  A Member may not voluntarily terminate membership in this Plan during
           active employment with the Company.

      (c)  If a Member transfers to a Subsidiary or Affiliate which is not
           participating in this Plan, or to an employment classification
           excluded from Plan participation, the Member's eligibility to make
           Elective Deferrals and Member Contributions, and to receive Matching
           or nonelective Contributions shall cease, but the Member's Account
           shall not be distributed until the Member has terminated employment
           with Atlantic Richfield Company or all of its Subsidiaries or
           Affiliates or is involved in a sale described in Subparagraph
           2.3(a)(ii) or (iii).


2.4   Member Suspension
      -----------------

      If an Employee is a Member of a defined contribution plan of the Company
      (including the Predecessor Plans), or a Subsidiary or Affiliate, and the
      Elective Deferrals to such plan of the Company or Subsidiary or Affiliate
      are suspended at the time the Employee becomes eligible for membership in
      this Plan, the Elective Deferrals and Employee's Contributions to the Plan
      shall commence with the first full pay period beginning on or after the
      date on which such period of suspension then in effect under the plan of
      the Company, or the Subsidiary or Affiliate, ends.


2.5   Member Transfers
      ----------------

      If a Member transfers to employment with a Subsidiary or Affiliate of the
      Company, which maintains a capital accumulation plan, the Member's Account
      shall be transferred to the capital accumulation plan of the Subsidiary or
      Affiliate in accordance with procedure established by the Administrator.


2.6   Capital Accumulation Plan Assets
      --------------------------------

      Upon the transfer of an Employee eligible to participate in the Plan from
      a Subsidiary or Affiliate, any assets maintained under a capital
      accumulation plan of such Subsidiary or Affiliate on behalf of such
      Employee will be transferred to the Plan in the same investment
      alternative under which held as of the transfer date, and such transferred
      assets will be subject to the reinvestment provisions under Paragraph 6.4,
      except as provided herein:

      (a)  Any assets transferred on behalf of a Member which have been invested
           in Common Stock of a Subsidiary or Affiliate in the subaccount
           attributable to

                                      -8-
<PAGE>

           the Member's Deferrals or Member Contributions under the capital
           accumulation plan of a Subsidiary or Affiliate will remain so
           invested, with future dividends being reinvested in such stock under
           the Member's Account, absent the Member's direction to reinvest such
           assets pursuant to Paragraph 6.4 of the Plan; provided, however, that
           any assets converted from the Common Stock of a Subsidiary or
           Affiliate to another investment alternative under the Plan may not be
           reinvested in Common Stock of a Subsidiary or Affiliate.

      (b)  Any assets transferred on behalf of a Member which have been invested
           in the Common Stock of a Subsidiary or Affiliate in the subaccount
           attributable to Company Contributions under the capital accumulation
           plan of a Subsidiary or Affiliate, will remain so invested, with
           future dividends being reinvested in such stock under the Member's
           Account; provided, however, that the Member, unless the Employee is
           an officer of CH-Twenty, Inc., may elect to convert such assets to
           Atlantic Richfield Company Common Stock held under the ESOP Part of
           the Plan and any assets so converted may not be reinvested in the
           Common Stock of a Subsidiary or Affiliate. If the Member is an
           officer of CH-Twenty, Inc. the Member may elect to convert such
           assets to Atlantic Richfield Company Common Stock held under the non-
           ESOP Part of the Plan and any assets so converted may not be
           reinvested in the Common Stock of a Subsidiary or Affiliate. This
           subparagraph does not apply to Atlantic Richfield Common Stock
           transferred to the Plan.

      (c)  Common Stock of a Subsidiary or Affiliate held by the Plan shall be
           subject to the sale and voting provisions of Section 6.

                                      -9-
<PAGE>

                                   SECTION 3
                          MEMBERS' ELECTIVE DEFERRALS

3.1  Members' Elections
     ------------------

     (a)  Each Member who is an Employee may enter into an Employee Contribution
          Agreement with the Company providing for withholding of Elective
          Deferrals and/or Member Contributions from each of the Member's
          regular paychecks at a rate of one percent to 27 percent of the
          Member's Earnings, in whole percentages.  An Employee Contribution
          Agreement shall remain in effect until changed by the Member, except
          as otherwise set forth in this Section 3.

     (b)  A Member's election shall be made in the manner prescribed by the
          Administrator and shall include such information as the Administrator
          may require.  A Member may change the Member's election with respect
          to the Member's rate of future contributions at any time by giving
          notice in such manner as is prescribed by the Administrator.  Such
          changes shall be effective as soon as administratively feasible after
          the date of receipt of such notice by the Administrator, or its
          delegate.

     (c)  The Company may limit or reduce its Employee Contribution Agreement
          with any Member at any time, on a nondiscriminatory basis, to the
          extent necessary to ensure compliance with the limitations of
          Paragraph 3.3, 3.4, 4.4 or 4.7.

     (d)  A Member's Elective Deferrals and Member Contributions will be
          suspended as follows:

         (i)   Upon the Member's transfer, other than on an approved leave of
               absence, to employment with:

               (1)   A Subsidiary or Affiliate which is not participating in the
                     Plan; or

               (2)   CH-Twenty, Inc. or any of its Subsidiaries or Affiliates in
                     such foreign countries as the Company shall designate; the
                     Member's Elective Deferrals and/or Member Contributions
                     shall automatically be suspended while the Member remains
                     in such employment.

         (ii)  Upon the Member's transfer to an employee group of the Company
               that is not participating in the Plan.

         (iii) As described in Section 7.

                                      -10-
<PAGE>

3.2  Contribution of Elective Deferrals and Member Contributions
     -----------------------------------------------------------

     The Company shall pay to the Trustee on behalf of each Member the Elective
     Deferrals and Member Contributions elected by the Member.  A Member's
     Elective Deferrals and Member Contributions shall be paid to the Trustee
     the earlier of the date such Elective Deferrals and Member Contributions
     can reasonably be segregated from the Company's general assets or the
     15/th/ day of the month following the month in which the Elective Deferrals
     and Member Contributions would have been paid to the Member. Elective
     Deferrals and Member Contributions may be paid to the Trustee in the
     following forms:

     (a)  To the extent that a Member has directed pursuant to the Plan that his
          or her Elective Deferrals and/or Member Contributions be invested in
          an option other than Atlantic Richfield Common Stock, such Elective
          Deferrals and/or Member Contributions shall be paid to the Trustee in
          cash;

     (b)  To the extent that a Member has directed pursuant to the Plan that his
          or her Elective Deferrals and/or Member Contributions be invested in
          Atlantic Richfield Company Common Stock under the Non-ESOP Part of the
          Plan, such Elective Deferrals and/or Member Contributions may be paid
          to the Trustee in cash, in shares of Atlantic Richfield Company Common
          Stock, or in any combination thereof; and

     (c)  To the extent that a Member has directed pursuant to the Plan that his
          or her Elective Deferrals and/or Member Contributions be invested in
          Atlantic Richfield Company Common Stock under the ESOP Part of the
          Plan, such Elective Deferrals and/or Member Contributions may be paid
          to the Trustee in cash, in shares of Atlantic Richfield Company Common
          Stock, in the form of forgiveness of indebtedness on an Acquisition
          Loan from the Company to the Plan, or in any combination thereof.

3.3  Annual Dollar Limitation
     ------------------------

     (a)  A Member's Elective Deferrals for a calendar year, when considered
          together with the amount of salary reduction elected by the Member
          under any other plan meeting the requirement of (S)401(k) of the Code,
          may not exceed $10,000, as adjusted pursuant to Code (S)415(d).

     (b)  Once a Member's Elective Deferrals reach the limitation described in
          Subparagraph 3.3(a), all subsequent deferrals will be suspended for
          the remainder of the calendar year.  Elective Deferrals will
          automatically resume on the following January 1.  Unless the Member
          elects to change the Elective Deferral percent according to Paragraph
          3.1, Elective Deferrals will resume at the rate in effect on the
          suspension date.

                                      -11-
<PAGE>

     (c)  If a Member notifies the Administrator on or before March 31 after the
          close of a calendar year that the Member's total Elective Deferrals
          (within the meaning of (S)402(g)(3) of the Code) for such calendar
          year exceed the limitation of Subparagraph 3.3(a), the Administrator
          shall direct that such excess Elective Deferrals, plus any income and
          minus any loss allocable thereto for the calendar year, be distributed
          no later than the April 15 following notification to the
          Administrator.  A Member is deemed to notify the Administrator of
          Elective Deferrals in excess of the limitation in Subparagraph 3.3(a)
          that arise by taking into account those Elective Deferrals made to the
          Plan or to any other Plan of the Company or a Subsidiary or Affiliate.

     (d)  For purposes of Subparagraph 3.3(c), gain or loss allocable to excess
          Elective Deferrals shall be computed under the method used by the Plan
          to allocate gains and losses.

3.4  Actual Deferral Percentage Tests
     --------------------------------

     The Plan shall comply with the requirements of (S)401(k)(3) of the Code,
     the regulations thereunder, including Treas. Reg. 1.401(k)-1(b) and
     Internal Revenue Service guidance in this regard, which provisions are
     incorporated herein by this reference.  To the extent permitted by
     regulations, Matching Contributions described in Paragraph 4.1 and
     nonelective contributions described in Paragraph 4.8 may, at the discretion
     of the Administrator, be deemed Elective Deferrals for purposes of this
     Paragraph 3.4.  Effective July 1, 1997, in determining whether the Plan
     satisfies the requirements of (S)401(k)(3) of the Code, the Plan shall use
     the prior-year testing method.

3.5  Distribution of Excess Contributions
     ------------------------------------

     (a)  If the average actual deferral percentage test of Paragraph 3.4 is not
          satisfied for a Plan Year, then the Excess Contributions, as defined
          below, and gain or loss allocable thereto, shall be distributed, to
          the extent required under Treasury regulations, no later than the last
          day of the Plan Year following the Plan Year for which the Excess
          Contributions were made.

     (b)  Effective July 1, 1997, for purposes of this paragraph, Excess
          Contributions shall consist of the excess of the aggregate amount of
          Elective Deferrals made by or on behalf of the affected Highly
          Compensated Employees over the maximum amount of all such
          contributions permitted under the test of Paragraph 3.4.  In reducing
          the excess contributions hereunder, the reduction shall be first
          applied to the Highly Compensated Employee with the highest percentage
          under Paragraph 3.4.  If reductions are further required to comply
          with Paragraph 3.4, such reductions shall be applied to the Highly
          Compensated Employee with the next highest percentage, and

                                      -12-
<PAGE>

          so forth until the nondiscrimination test of Paragraph 3.4 is
          satisfied. The aggregate amount of reductions determined in the
          preceding sentence shall be distributed, together with gain or loss
          allocable thereto, to the Highly Compensated Employees with the
          highest dollar amount of Elective Deferrals. The Elective Deferrals of
          the Highly Compensated Employee with the highest dollar amount of
          Elective Deferrals are reduced by the amount required to cause such
          Highly Compensated Employee's Elective Deferrals to equal the Elective
          Deferral amount of the Highly Compensated Employee with the next
          highest dollar amount of Elective Deferrals. If the total amount
          distributed to the Highly Compensated Employee is less than the total
          Excess Contribution, this process shall be repeated until the total
          Excess Contributions are distributed.

     (c)  The gain or loss allocable to Excess Contributions shall be determined
          by multiplying the gain or loss allocable to the Member's Elective
          Deferrals for the Plan Year by a fraction, the numerator of which is
          the Excess Contributions made on behalf of the Member for the Plan
          Year, and the denominator of which is the sum of the Member's Account
          balances attributable to the Member's Elective Deferrals amounts on
          the last day of the Plan Year.

3.6  Make-Up Elective Deferrals and Member Contributions
     ---------------------------------------------------

     Notwithstanding any provision of the Plan to the contrary, Elective
     Deferrals and Member Contributions with respect to qualified military
     service may be made in accordance with (S)414(u) of the Code.

                                      -13-
<PAGE>

                                   SECTION 4
                              COMPANY CONTRIBUTION

4.1  Matching Contribution
     ---------------------

     Subject to the provisions of Paragraphs 4.3 and 4.4, for each pay period,
     the Company shall pay to the Trustee a contribution on behalf of each
     Member equal to 160 percent of the Member's Elective Deferrals, including
     Elective Deferrals under Paragraph 3.6, for the pay period which do not
     exceed five percent of the Member's Earnings for the pay period. This
     contribution shall be made no later than 30 days following the date on
     which the related Member Deferrals are made, or as soon as administratively
     practicable, if later, and except for Members who have attained age 55,
     shall be made under the ESOP Part of the Plan.

4.2  Form of Contribution
     --------------------

     Matching Contributions may be made in the form of cash, shares of Atlantic
     Richfield Company Common Stock, forgiveness of indebtedness on an
     Acquisition Loan from the Company to the Plan, or any combination of the
     foregoing.

4.3  Members Excluded From Contribution
     ----------------------------------

     The Matching Contribution shall not be made on behalf of a Member described
     in one or more of the following subparagraphs:

     (a)  A Member who is an officer of CH-Twenty, Inc.; or

     (b)  A Member whose base salary is more than $150,000 on an annualized
          basis.

4.4  Actual Contribution Percentage Test
     -----------------------------------

     With respect to Member Contributions and Matching Contributions, the Plan
     shall comply with the requirements of (S)401(m)(2) of the Code, the
     regulations thereunder, including Treas. Reg. (S)1.401(m)-1(b) and Internal
     Revenue Service guidance in this regard, which provisions are incorporated
     herein by this reference. To the extent permitted by regulations, Elective
     Deferrals described in Paragraph 3.1 and nonelective contributions
     described in Paragraph 4.8 may, at the discretion of the Administrator, be
     taken into account in satisfying the requirements of this Paragraph 4.4.
     Effective July 1, 1997, in determining whether the Plan satisfies the
     requirements of Section 401(m)(2) of the Code, the Plan shall use the
     prior-year testing method.

                                      -14-
<PAGE>

4.5  Distribution of Excess Aggregate Contributions
     ----------------------------------------------

     (a)  If the nondiscrimination tests of Paragraph 4.4 are not satisfied for
          a Plan Year, then the Excess Aggregate Contributions, as defined
          below, and any gain or loss allocable thereto, shall be distributed to
          the Member on whose behalf the Excess Aggregate Contributions were
          made no later than the last day of the Plan Year following the Plan
          Year for which such Excess Aggregate Contributions were made.  Member
          Contributions shall be distributed before Matching Contributions.

          Notwithstanding the foregoing, to the extent otherwise required to
          comply with the requirements of (S)401(a)(4) of the Code and
          regulations thereunder, vested Matching Contributions may be
          forfeited.

     (b)  Effective July 1, 1997, for purposes of this paragraph, Excess
          Aggregate Contributions shall consist of the excess of the amount of
          Member Contributions, Matching Contributions, and Elective Deferrals
          (to the extent not used to satisfy the average actual deferral
          percentage test of Section 3.4) made on behalf of the affected Highly
          Compensated Employees over the maximum amount of all such
          contributions permitted under the nondiscrimination tests under
          Paragraph 4.4.  In reducing the Excess Aggregate Contributions
          hereunder, the reduction shall be first applied to the Highly
          Compensated Employee with the highest percentage under Paragraph 4.4.
          If reductions are further required to comply with Paragraph 4.4, such
          reductions shall be applied to the Highly Compensated Employee with
          the next highest percentage, and so forth until the nondiscrimination
          tests of Paragraph 4.4 are satisfied.  The aggregate amount of
          reductions determined in the preceding sentence shall be distributed
          together with gain or loss allocable thereto, to the Highly
          Compensated Employees with the highest dollar amount of Member
          Contributions and Matching Contributions.  The Member Contributions
          and Matching Contributions of the Highly Compensated Employee with the
          highest dollar amount of such contributions are reduced by the amount
          required to cause such Highly Compensated Employee's Member
          Contributions and Matching Contributions to equal the Member
          Contributions and Matching Contributions of the Highly Compensated
          Employee with the next highest dollar amount of such contributions.
          If the total amount distributed to the Highly Compensated Employee is
          less than the total Excess Aggregate Contribution, this process shall
          be repeated until the total Excess Aggregate Contributions are
          distributed.

     (c)  The gain or loss allocable to Excess Aggregate Contributions shall be
          determined by multiplying the gain or loss allocable to such
          contributions by a fraction, the numerator of which is the Excess
          Aggregate Contributions on behalf of the Member for the Plan Year, and
          the denominator of which is the

                                      -15-
<PAGE>

          sum of the Member's Account balances attributable to Excess Aggregate
          Contributions on the last day of the Plan Year.

4.6  Limitation On The Multiple Use Alternative
     ------------------------------------------

     (a)  The sum of the average actual deferral percentage of Highly
          Compensated Employees under Paragraph 3.4 and the average contribution
          percentage of Highly Compensated Employees under Paragraph 4.4 shall
          not exceed the "aggregate limit", as defined in (S)401(m)(9) of the
          Code and the regulations thereunder.

     (b)  If the aggregate limit is exceeded, the average contributions
          percentage of the Highly Compensated Employees shall be reduced in
          accordance with the provisions of Paragraph 4.5.  In lieu of reducing
          the average contribution percentage, the Administrator may reduce the
          average actual deferral percentage of the Highly Compensated Employees
          in accordance with the provisions of Paragraph 3.4.  The reductions
          under this paragraph shall be made only to the extent necessary to
          comply with the restrictions on the multiple use of the alternative
          limitation within the meaning of Code (S)401(m)(9).

4.7  Section 415 Limitations
     -----------------------

     (a)  In addition to other limitations set forth in the Plan and
          notwithstanding any other provisions of the Plan, "annual additions"
          made to this Plan (and all other defined contribution plans required
          to be aggregated with the Plan under the provisions of (S)415 of the
          Code) shall not exceed an amount in excess of the limit set forth in
          such section of the Code.  For purposes of calculating such limit
          under (S)415 of the Code, the "limitation year" shall be the calendar
          year.  Elective Deferrals, Member Contributions and Matching
          Contributions in excess of the actual deferral and contribution
          percent tests of Sections 3.4 and 4.4 are considered annual additions
          even if corrected through distribution.

     (b)  If the limitations described in (S)415(c) of the Code are exceeded for
          a Member for a limitation year, the excess will be eliminated as
          follows:

          (i)   Provisions of any other defined contribution plans established
                by the Company or a Subsidiary or Affiliate which have caused
                the limits to be exceeded will be applied; provided, however,
                that if such other Plan is described in (S)401(k) of the Code,
                the provisions of the Plan in which the Member is active as of
                the last day of the limitation year shall be applied before the
                provisions of the Plan in which the Member is inactive.

                                      -16-
<PAGE>

          (ii)  Amounts attributable to after-tax contributions made by the
                Member to the Plan (or any other plan maintained by the Company
                or any Subsidiary or Affiliate) shall be paid to the Member.

          (iii) Amounts attributable to Elective Deferrals made by a Member to
                the Plan (or any other plan maintained by the Company or a
                Subsidiary or Affiliate) shall be paid to the Member.

          (iv)  The excess, if any, will be held unallocated in a suspense
                account. The suspense account will be applied to reduce
                contributions for remaining Members in the limitation year, and
                each succeeding limitation year, if necessary. If a suspense
                account is in existence at any time during the limitation year
                pursuant to this subparagraph, it will not participate in the
                allocation of the investment gains and losses.

     (c)  Prior to January 1, 2000, if the limitations described in (S)415(e) of
          the Code are exceeded for a Member for a limitation year, the excess
          will be eliminated by applying the provisions of the defined benefit
          plan in which the Member participates.

4.8  Nonelective Contributions
     -------------------------

     (a)  The Administrator, in its sole discretion, may make a nonelective
          contribution to the Accounts of certain Members who are not highly
          compensated to the extent necessary to satisfy the requirement of
          Paragraph 3.4 and/or 4.4 of the Plan, or to assist the Plan or any
          other plan of the Company or any Subsidiary or Affiliate to satisfy
          the requirements of (S)410(b) of the Code.

     (b)  A contribution under Subparagraph 4.8(a) shall be allocated to
          eligible Members in the ratio that the Earnings of each such Member
          for the Plan Year bears to the total Earnings of all such Member's for
          the Plan Year.

     (c)  The Company shall make contributions necessary to reinstate Members'
          Accounts pursuant to Paragraph 10.8 of the Plan.

     (d)  The Company may make contributions necessary to correct administrative
          errors relative to a Member's Account.

4.9  Exclusive Benefit
     -----------------

     The corpus or income of the trust may not be divested to or used for other
     than the exclusive benefit of the Members and their beneficiaries and to
     defray reasonable expenses of administering the Plan.

                                      -17-
<PAGE>

                                   SECTION 5
                                FINANCED SHARES

5.1  Acquisition Loans
     -----------------

     CH-Twenty, Inc., by action of its President, may direct the Trustee to
     incur Acquisition Loans from time to time to finance the acquisition of
     Atlantic Richfield Company Common Stock (Financed Shares) under the ESOP
     Part of the Plan or to repay a prior Acquisition Loan. For this purpose, an
     installment obligation incurred in connection with the purchase of Atlantic
     Richfield Company Common Stock shall be treated as an Acquisition Loan.

     An Acquisition Loan shall be for a specific term, shall bear a reasonable
     rate of interest, and shall not be payable on demand except in the event of
     default. An Acquisition Loan may be secured by a pledge of the Financed
     Shares so acquired (or acquired with the proceeds of a prior Acquisition
     Loan which is being refinanced). No other assets of the Plan may be pledged
     as collateral for an Acquisition Loan, and no lender shall have recourse
     against assets of the Plan other than Financed Shares remaining subject to
     pledge. If the lender is a "party in interest" [as defined in (S)3(14) of
     ERISA], the Acquisition Loan must provide that in the event of default,
     assets of the Plan may be transferred to the lender only upon, and to the
     extent of, the failure of the Plan to meet the payment schedule of the
     Acquisition Loan. Any pledge of Financed Shares must provide for the
     release of the shares so pledged as payments on the Acquisition Loan are
     made by the Trustee and such Financed Shares are allocated to Members'
     Accounts under Paragraph 5.2.

     Payments of principal and/or interest on any Acquisition Loan shall be made
     by the Trustee, as directed by the Company, only from: (a) Company
     Contributions paid in cash to enable the Plan to make payments on such
     Acquisition Loan [including Elective Deferrals and Member Contributions, to
     the extent that Members have directed pursuant to the Plan that such
     Elective Deferrals and/or Member Contributions be invested in shares of
     Atlantic Richfield Company Common Stock under the ESOP Part of the Plan]
     and earnings attributable thereto; (b) the proceeds of any Acquisition Loan
     and the earnings attributable thereto; and (c) any cash dividends received
     by the Plan on the Financed Shares purchased with the proceeds of such
     Acquisition Loan. The payments made with respect to an Acquisition Loan for
     a Plan Year must not exceed the sum of such Matching Contributions,
     Elective Deferrals, Member Contributions, proceeds, earnings, and dividends
     for that Plan Year and prior Plan Years, as reduced by the amount applied
     to make such payments in prior Plan Years. As directed by Atlantic
     Richfield Company, the Trustee also may sell any Financed Shares that have
     not yet been allocated to Members' Accounts and use the proceeds from such
     sale to pay principal and/or interest on the Acquisition Loan used to
     acquire such shares.

                                      -18-
<PAGE>

5.2  Payments on Acquisition Loan
     ----------------------------

     The acquisition of Atlantic Richfield Company Common Stock with the
     proceeds of an Acquisition Loan may be made on the open-market, or from the
     Company, in a single purchase or a series of purchases over a period of
     time. Prior to use for such purchase or purchases, the Acquisition Loan
     proceeds may be invested by the Trustee (as directed by CH-Twenty, Inc.) in
     interest-bearing accounts or instruments. Interest derived therefrom shall
     be applied to make payments on the Acquisition Loan, or, if the Acquisition
     Loan has been repaid in full, shall be allocated as of the last day of the
     Plan Year among the Accounts of all Members who have not terminated
     membership pursuant to Paragraph 2.3 as of such date in proportion to their
     Earnings for the Plan Year.

     All Financed Shares acquired by the Plan shall initially be credited to a
     loan suspense account, and will be allocated to the Members' Accounts only
     as payments on the Acquisition Loan are made. Release from the loan
     suspense account for allocation to Members' Accounts in each Plan Year
     shall be based on shares of stock or other non-monetary units, rather than
     by dollar amount, and shall not be less than the number calculated as
     follows:

     (a)  The number of Financed Shares held in the loan suspense account
          immediately before the release in the current Plan Year shall be
          multiplied by a fraction, the numerator of which is the amount of
          principal and interest paid on the Acquisition Loan for that Plan
          Year, and the denominator of which is the sum of the numerator plus
          the total payments of principal and interest on that Acquisition Loan
          projected to be paid for all future Plan Years.  For this purpose, the
          interest to be paid in future Plan Years is computed by using the
          interest rate in effect as of the last day of the current Plan Year.

     (b)  In lieu of the method described in Subparagraph 5.2(a), the Company
          may elect (as to each  Acquisition Loan) or the provisions of the
          Acquisition Loan may provide for the release of Financed Shares from
          the loan suspense account based solely on the ratio that the payments
          of principal for each Plan Year bear to the total principal amount of
          the Acquisition Loan. This method may be used only if:  (i) the
          Acquisition Loan provides for annual payments of principal and
          interest at a cumulative rate that is not less rapid at any time than
          level annual payments of such amounts for ten years; (ii) interest
          included in any payment on the Acquisition Loan is disregarded only to
          the extent that it would be determined to be interest under standard
          loan amortization tables; and (iii) the entire duration of the
          Acquisition Loan repayment period does not exceed ten years, even in
          the event of a renewal, extension, or refinancing of the Acquisition
          Loan.

                                      -19-
<PAGE>

     As of each date that payments (other than payments with the proceeds of a
     new Acquisition Loan) are made on an Acquisition Loan, the Financed Shares
     released from the loan suspense account shall be allocated to Members'
     Accounts in proportion to the amounts debited from each Member's Account to
     make the Acquisition Loan payments.

                                      -20-
<PAGE>

                                   SECTION 6
              INVESTMENT OF MEMBERS' AND FORMER MEMBERS' ACCOUNTS

6.1  Members' and Former Members' Accounts
     -------------------------------------

     The Administrator shall establish and maintain an Account in the name of
     each Member and Former Member. Separate records shall be maintained with
     respect to the portion of a Member's or Former Member's Account
     attributable to Elective Deferrals, Member Contributions, rollovers under
     Section 13, Matching Contributions, and earnings thereon.

6.2  Investment of Elective Deferrals, Member Contribution, Rollovers and
     --------------------------------------------------------------------
     Certain Matching Contributions
     ------------------------------

     (a)  In accordance with procedures established by the Administrator, the
          following amounts shall be invested by the Trustee among the
          investment alternatives authorized by the Administrator in the
          proportion indicated by the Member or Former Member in his or her
          investment directions provided to the Administrator, or its delegate:

          (i)   Elective Deferrals;
          (ii)  Member Contributions;
          (iii) Rollovers;
          (iv)  Matching Contributions pursuant to Subparagraph 6.3(b); and
          (v)   Matching Contributions to the Atlantic Richfield Savings Plan II
                made prior to July 1, 1988.

     (b)  Notwithstanding anything in the Plan to the contrary, the Trustee may
          limit the daily volume of purchases or sales of Atlantic Richfield
          Common Stock to the extent it believes such action to be in the best
          interest of Members or Former Members.

6.3  Investment of Company Contributions
     -----------------------------------

     (a)  Except as provided in Subparagraph 6.3(b), all Matching Contributions
          and nonelective contributions pursuant to Subparagraph 4.8(a), and any
          amounts of interest attributable to the proceeds of an Acquisition
          Loan allocated to Members' or Former Members' Accounts pursuant to
          Paragraph 5.2 after the Acquisition Loan has been repaid in full,
          shall at all times be invested in Atlantic Richfield Company Common
          Stock under the ESOP Part of the Plan.  Contributions under Paragraph
          4.1 made in cash shall be applied to purchase shares of Atlantic
          Richfield Company Common Stock or to make payments on an Acquisition
          Loan within a reasonable time after being paid to the Trustee or after
          being allocated to Members' or Former Members' Accounts.

                                      -21-
<PAGE>

     (b)  A Member or Former Member who has attained age 55 may invest Company
          Contributions in any of the investment alternatives set forth in
          Paragraph 6.2.

6.4  Member or Former Member Direction Of Investments
     ------------------------------------------------

     In accordance with procedures established by the Administrator, each Member
     or Former Member may direct how his or her Account is to be invested among
     the available investment funds. In the event a Member or Former Member
     fails to make an investment election, with respect to all or any portion of
     his or her Account, the Trustee shall invest all or such portion of his or
     her Account in the investment fund to be designated by the Administrator.
     Under procedures established by the Administrator, a Member or Former
     Member may change his or her investment election, with respect to future
     contributions and amounts previously accumulated in the Member's or Former
     Member's Account. Any such change in a Member's or Former Member's
     investment election shall be effective at such time as may be prescribed by
     the Administrator.

6.5  Allocation of Investment Experience
     -----------------------------------

     As of each Valuation Date, the investment funds of the Trust, other than
     shares of Company Common Stock, shall be valued at fair market value, and
     the income, loss, appreciation and deprecation (realized and unrealized),
     and any paid expenses of the Trust attributable to such fund shall be
     apportioned among Member's or Former Member's Accounts within the fund
     based upon the value of each Account within the fund as of the preceding
     Valuation Date.

6.6  Manner and Time of Debiting Distributions
     -----------------------------------------

     For any Member or Former Member who is entitled to receive a distribution
     from his or her Account, the amount distributed shall be based upon the
     fair market value of the Member's or Former Member's Account as of the
     Valuation Date immediately preceding the distribution.

6.7  Title of Investments
     --------------------

     All investments will be held in the name of the Trustee or its nominees.

6.8  Voting of Investments
     ---------------------

     Except as provided in Paragraph 6.9, the Trustee in accordance with the
     Trust Agreement, shall exercise all voting and other rights associated with
     any investments held in the Plan.

                                      -22-
<PAGE>

6.9  Voting of Atlantic Richfield Company Common Stock
     -------------------------------------------------

     (a)  The Trustee shall vote whole shares of Atlantic Richfield Company
          Common Stock credited to each Member's or Former Member's Account in
          accordance with such Members' or Former Members' written instructions.
          Fractional shares of Atlantic Richfield Company Common Stock shall be
          aggregated into whole shares of stock and voted by the Trustee, to the
          nearest whole vote, in the same proportion as shares are to be voted
          by the Trustee pursuant to Members' or Former Members' written
          instructions.  In the absence of voting instructions by one or more
          Members or Former Members, the Trustee shall vote uninstructed shares,
          to the nearest whole vote, in the same proportion as shares are to be
          voted by the Trustee pursuant to Members' or Former Members' written
          instructions.  The Trustee shall vote unallocated shares, to the
          nearest whole vote, in the same proportion as allocated shares are to
          be voted by the Trustee pursuant to Members' or Former Members'
          written instructions.

     (b)  The Trustee shall exercise rights other than voting rights
          attributable to whole shares of Atlantic Richfield Company Common
          Stock credited to each Member's or Former Member's Account in
          accordance with such Members' or Former Members' written instructions.
          Rights attributable to fractional shares of Company Common Stock
          (which for this purpose shall be aggregated into whole shares of
          stock) shall be exercised by the Trustee in the same proportion as
          rights which are exercised by the Trustee pursuant to Members' or
          Former Members' written instructions.  In the absence of instructions
          by one or more Members or Former Members, the Trustee shall exercise
          uninstructed rights in the same proportion as rights which are to be
          exercised by the Trustee pursuant to Members' or Former Members'
          written instructions.  The Trustee shall exercise rights attributable
          to unallocated shares in the same proportion as rights attributable to
          allocated shares which are to be exercised by the Trustee pursuant to
          Members' or Former Members' written instructions.  Notwithstanding the
          foregoing, in the absence of directions, the Trustee shall not tender
          shares of  Common Stock in the same proportion as shares are tendered
          pursuant to Member's or Former Member's written instructions.

     (c)  The Trustee shall notify the Members or Former Members of each
          occasion for the exercise of voting rights and rights other than
          voting rights within a reasonable time before such rights are to be
          exercised.  This notification shall include all the information that
          the Company distributes to shareholders regarding the exercise of such
          rights.

                                      -23-
<PAGE>

6.10  Allocation of Dividends on Atlantic Richfield Company Common Stock
      ------------------------------------------------------------------

     (a)  Any cash dividends declared on Atlantic Richfield Company Common Stock
          held in a Member's or Former Member's Account under the ESOP Part of
          the Plan as of the record date for the dividend shall be paid in cash
          to the Member or Former Member (or, in the event of death, to the
          Member's or Former Member's beneficiary) on, or as soon as possible
          following, the payment date for the dividend.

     (b)  Any cash dividends declared on Atlantic Richfield Company Common Stock
          held in a loan suspense account as of the record date for the dividend
          shall be used to make payments on the Acquisition Loan used to acquire
          the shares of stock held in such account.

     (c)  Except as provided in Subparagraphs 6.10(a) and (b), all dividends or
          other distributions attributable to shares of Atlantic Richfield
          Company Common Stock shall be allocated to the Account of the Member
          or Former Member whose Account is credited with such shares.

6.11 Investment Advisory Fees
     ------------------------

     The investment advisory fees, if any, incurred for management of any of the
     investment funds are charged to each respective fund.

6.12 Member or Former Member Protection
     ----------------------------------

     No shares of Atlantic Richfield Company Common Stock held by the ESOP Part
     of the Plan may be subject to a put, call or other option, or buy/sell or
     similar arrangement.  The provisions of this Paragraph 6.12 shall continue
     to be applicable to the shares of Atlantic Richfield Company Common Stock
     held by the ESOP Part of the Plan even if such part ceases to be an
     Employee Stock Ownership Plan under (S)4945(e)(7) of the Code.

6.13 Confidentiality
     ---------------

     The Capital Accumulation Plan Administrative Committee shall be responsible
     for ensuring the adequacy of procedures established by the Administrator to
     safeguard the confidentiality of information relating to the purchasing,
     holding and selling of Atlantic Richfield Company Common Stock and any
     voting, tender or similar rights relating to such stock.

                                      -24-
<PAGE>

                                   SECTION 7
                         WITHDRAWALS DURING EMPLOYMENT

7.1  Age 59 1/2 Withdrawal
     ---------------------

     A Member who has attained age 59 1/2 may request that all or a portion of
     the Member's Account be paid to the Member.  The request must be made at
     such time and in such manner as prescribed by the Administrator.

7.2  Application and Basis for Hardship Withdrawal
     ---------------------------------------------

     (a)  A Member may at any time request that the Member's Elective Deferrals
          (but not the earnings thereon) be paid to the Member due to financial
          hardship.  The request must be made to the Administrator at such time
          and in such manner as prescribed by the Administrator and shall
          include such documentation and/or written explanation requested by the
          Administrator.

     (b)  The Administrator shall authorize a withdrawal on account of financial
          hardship only upon making a written determination that the withdrawal
          does not exceed the amount of the immediate and heavy financial need
          of the Member, including amounts withheld for taxes and the amount of
          any early distribution taxes, if any, and that the withdrawal is based
          on the need for funds under one or more of the five following
          circumstances:

         (i)   The payment of unreimbursable medical expenses described in
               (S)29(d) of the Code previously incurred by the Member, the
               Member's spouse, or any dependents of the Member (as defined in
               (S)152 of the Code) or necessary for these persons to obtain
               medical care;

         (ii)  The payment of all or a portion of the purchase price (excluding
               mortgage payments) of a principal residence of the Member;

         (iii) The payment of tuition and related educational expenses for the
               next 12 months of post-secondary education for the Member, his or
               her spouse, children or dependents, as defined in Code (S)152;

         (iv)  The need to prevent the eviction of the Member from his or her
               principal residence or foreclosure on the mortgage of the
               Member's principal residence; and

         (v)   The need to satisfy a judgment of a federal, state or local court
               against the Member (such withdrawal will be permitted only if a
               written determination is made that such withdrawal is necessary
               in light of immediate and heavy financial need of the Member).

                                      -25-
<PAGE>

     (c) Hardship withdrawals shall be paid as follows:

         (i)   A hardship withdrawal shall be paid in a single payment to the
               Member within 60 days following the Administrator's favorable
               determination.

         (ii)  A hardship withdrawal shall not cause a termination of Membership
               in the Plan.

     (d) As a condition to receiving the withdrawal:

         (i)   The Member must have obtained all distributions and all
               nontaxable loans available as of the date of the withdrawal under
               this Plan and any other employee benefit plan maintained by the
               Company and any Subsidiary or Affiliate;

         (ii)  The Member's contributions to the Plan and any other defined
               contribution or defined benefit employee pension benefit plan
               maintained by the Company and any Subsidiary or Affiliate are to
               be suspended for 12 months; and Elective Deferrals shall be
               suspended for the remainder of the calendar year in which the
               hardship distribution occurs and the calendar year immediately
               following such calendar year.

7.3  Partial Withdrawals of Member Contributions
     -------------------------------------------

     (a)  An application for partial withdrawal of funds attributable to Member
          Contributions must be in the form prescribed by the Administrator.
          Distribution will be made as soon as practicable after the date the
          application is received by the Administrator.; and

     (b)  A Member may make the following partial withdrawals during employment
          with the Company; provided, that (i) partial withdrawals under this
          Paragraph 7.3 are made at not less than six-month intervals, and (ii)
          Member Contributions made prior to January 1, 1987, must be withdrawn
          prior to withdrawal of any other contributions and earnings:

          (i)  Items in the Member's Account derived from Member Contributions,
               and earnings thereon (Member Contributions made prior to January
               1, 1987 must be withdrawn first);

          (ii) Items in the Member's Account derived from Company Contribution
               to an Atlantic Richfield Savings Plan make prior to July 1, 1988,
               and earnings thereon.

                                      -26-
<PAGE>

                                   SECTION 8
             PAYMENTS ON TERMINATION OF MEMBERSHIP OR OTHER REASONS

8.1  Termination of Membership
     -------------------------

     (a)  If a Member's membership in the Plan is terminated due to disability,
          termination of employment for any other reason except death, or as the
          result of a sale described in Subparagraphs 2.3(a)(ii) or (iii), the
          Member may receive all items in the Member's Account.  Each Member
          shall be fully vested at all times in all items in the Member's
          Account, whether the same be derived from Elective Deferrals, Member
          Contributions, Company Contributions or rollovers, and earnings
          thereon.

     (b)  Upon the election of the Member who has terminated membership, all
          items in such Member's Account shall be distributed to the Member.
          With respect to a Former Member who does not request a distribution:

          (i)   Notwithstanding anything to the contrary in this Paragraph 8.1,
                a Former Member's Account shall be distributed in accordance
                with the provisions of Paragraph 8.7;

          (ii)  In the case of the Former Member's death prior to final
                distribution, the Former Member's Account shall be distributed
                in accordance with Paragraph 8.2 of the Plan; and

          (iii) No loans or hardship withdrawals may be taken following
                termination of membership or disability.

     (c)  Notwithstanding anything to the contrary in this Paragraph 8.1, all
          items in the Account of a Member who has terminated membership, and
          whose Account balance is $5,000 or less on the date of determination,
          shall be distributed as soon as administratively practicable following
          the Member's termination of membership, unless the Member elects an
          earlier distribution date.

     (d)  Notwithstanding anything in the Plan to the contrary, when a Former
          Member elects to receive all items in the Former Member's Account and,
          in conjunction therewith, directs that items in his or her Account be
          converted pursuant to Paragraph 6.4, the conversion shall be
          transacted on the later of the first transaction date under the Plan
          following the Administrator's receipt of a request for distribution,
          or the date of termination.  Distribution under this Paragraph 8.1
          shall be made in accordance with the requirements of (S)409(h) of the
          Code in the form of cash, Company stock or a combination thereof, as
          elected by the Member.  If the Member does not make an election
          hereunder, Company stock will be distributed in kind and

                                      -27-
<PAGE>

          all other investment alternative shall be converted to cash.

     (e)  Under procedures established by the Administrator, distributions under
          this Paragraph 8.1 may be made under any of the following forms of
          payment, or any combination thereof:

          (i)   Lump sum distribution;
          (ii)  Installment payments, not to exceed 20 years if a specific
                period is requested; or
          (iii) Partial withdrawals.

8.2  Death
     -----

     (a)  If a Member or Former Member dies and it is established to the Plan's
          satisfaction that the consent required under Subparagraph 8.2(c),
          either has been obtained or was not obtainable, all items in the
          Member's or former Member's Account shall be paid to the beneficiary
          or beneficiaries most recently designated by the Member or Former
          Member in such manner as prescribed by the Administrator. If no such
          designation shall have been made, or if all designated beneficiaries
          should die before the Member or former Member, payment shall be made
          to the Member's or former Member's estate.

     (b)  Except as provided in Subparagraph 8.2(c), if a Member or former
          Member is survived by a spouse, all items in the Member's or former
          Member's Account shall be paid to the Member's spouse.

     (c)  If a Member or former Member is survived by a spouse, all items in a
          Member's or former Member's Account shall be paid to the beneficiary
          or beneficiaries most recently designated by the Member or former
          Member in such manner as prescribed by the Administrator; provided,
          (i) the surviving spouse of the Member or former Member has
          irrevocably consented in writing to the designation of the specific
          beneficiary or beneficiaries, which designation may not be changed
          without spousal consent (or the spouse expressly permits designations
          by the Member or Former Member without any further spousal consent),
          such consent acknowledged the effect of the election and such consent
          was witnessed by a notary public, or (ii) it is established to the
          Plan's satisfaction that the consent required by Subparagraph
          8.2(c)(i), could not be obtained because the surviving spouse could
          not be located or because of such other circumstances as the Secretary
          of Treasury may by regulation prescribe.  Any consent necessary under
          this paragraph shall be effective only with respect to such spouse,
          or, in the event it is established that the consent may not be
          obtained, such designated spouse.  A revocation of a prior designation
          may be made by a Member or Former Member without the consent of the
          spouse at any time

                                      -28-
<PAGE>

          prior to the Member's for Former Member's death. A consent that
          permits designation by the Member or Former Member without any
          requirement for further consent by the spouse must acknowledge that
          the spouse has the right to limit consent to a specific beneficiary
          and that the spouse voluntarily elects to relinquish such right.

     (d)  Payment under this Paragraph 8.2 may be made in any form of
          distribution permitted by Paragraph 8.1; provided, however, that all
          items in the Member's or Former Member's Account shall be paid no
          later than December 31 of the calendar year which contains the fifth
          anniversary of the date of the Member's death.  Prior to distribution,
          the beneficiary shall have the rights of a Former Member under Section
          6 and Paragraph 8.1; provided, however, that the beneficiary may not
          elect installments or partial withdrawals under Subparagraphs
          8.1(e)(ii) and (iii) and any Atlantic Richfield Company Stocks held
          under the ESOP Part of the Plan shall be converted to non-ESOP
          Atlantic Richfield Common Stock.

8.3  Disability
     ----------

     (a)  A Member who is determined to be disabled may elect to receive a
          distribution of such Member's Account in accordance with Paragraph
          8.1.

     (b)  A Member is disabled if as a result of a medically determinable
          physical or mental impairment resulting from illness or injury the
          Member is unable to perform one or more of the substantial duties of
          the Member's normal work assignment with the Company or of any work
          assignment which the Company determines is available to the Member and
          for which the Member is reasonably qualified by education, training or
          experience to perform as determined by the Administrator after review
          by the entity designated by the Administrator.

8.4  Divorce
     -------

     To the extent a Qualified Domestic Relations Order ("QDRO"), as defined in
     (S)414(p) of the Code, is received by the Plan, distributions from a
     Member's Account shall be made to an Alternate Payee, as defined in
     (S)414(p) of the Code, as soon as administratively possible following the
     determination of the order's qualified status. Prior to such distribution,
     Atlantic Richfield Common Stock in the ESOP Part of the Plan shall be
     converted to non-ESOP Atlantic Richfield Common Stock.

8.5  Rollover
     --------

     (a)  Notwithstanding anything in this Section 8 to the contrary, a
          distributee, as defined below, may elect, at a time and in the manner
          prescribed by the

                                      -29-
<PAGE>

          Administrator, to have all or a portion of a distribution under this
          Section 8, other than any Member Contributions and any amount required
          to be distributed pursuant to (S)401(a)(9) of the Code, made payable
          to an eligible retirement plan.

     (b)  For purposes of this Section 8, other than Paragraph 8.2, an eligible
          retirement plan is an individual retirement account or annuity
          described in (S)408(a) or (b) of the Code, an annuity plan described
          in (S)403(a) of the Code or a qualified trust described in (S)401(a)
          of the Code that accepts such distribution.  For purposes of a
          distribution under Paragraph 8.2, an eligible retirement plan is an
          individual retirement account or annuity.

     (c)  Distributee means an Member or Former Member, the surviving spouse of
          such Member or such Member's spouse or former spouse who is an
          alternate payee as defined in (S)414(p) of the Code.

8.6  Notice
     ------

     With respect to a Former Member whose account exceeds $5,000, the
     Administrator shall provide the notice required by (S)1.411(a)-11(c) of
     Income Tax Regulations no less than 30 days and no more than 90 days before
     the Former Member's date of distribution; provided, however, that such
     distribution may commence less than 30 days after the required notice is
     given if:

     (a)   The Former Member is informed of the Former Members' right to a
           period of at least 30 days after receiving the notice to consider
           distribution options; and

     (c)  The Former Member, after receiving the notice, affirmatively elects a
          distribution.

     The distribution shall commence no earlier than seven days following the
     date the notice, described above, is provided to the Former Member.

8.7  Distributions
     -------------

     (a)  All distributions required under the Plan shall be determined and
          made in accordance with the proposed regulations under (S)401(a)(9) of
          the Code, including the minimum distribution incidental benefit
          requirement of (S)1.401(a)(9)-2 of the proposed regulations.

     (b)  The entire interest of a Member must be distributed or begin to be
          distributed no later than the Member's required beginning date.  The
          required beginning date of a Member is the later of the April 1 of the
          calendar year following the calendar year in which the Member attains
          age

                                      -30-
<PAGE>

          70 1/2 or retires, except that benefit distributions to a five-percent
          owner must commence by the April 1 of the calendar year following the
          calendar year in which the Member attains age 70 1/2.

     (c)  As of the first distribution calendar year, as defined below,
          distributions, if not made in a single-sum, may only be made over one
          of the following periods (or a combination thereof):

          (i)   The life of the Member;
          (ii)  The life of the Member and a designated beneficiary;
          (iii) A period certain not extending beyond the life expectancy of
                the Member; or
          (iv)  A period certain not extending beyond the joint and last
                survivor expectancy of the Member and a designated beneficiary.

     (d)  The amount required to be distributed for each calendar year,
          beginning with distributions for the first distribution calendar year,
          as defined below, must at least equal the quotient obtained by
          dividing the Member's entire Account as of the last Valuation Date in
          the calendar year preceding the distribution calendar year, by the
          applicable life expectancy.

     (e)  The minimum distribution required for the Member's first
          distribution calendar year must be made on or before the Member's
          required beginning date as defined in Subparagraph 8.7(b).  The
          minimum distribution for other calendar years, including the minimum
          distribution for the distribution calendar year in which the Member's
          required beginning date occurs, must be made on or before December 31
          of that distribution calendar year.

     (f)  If the Member dies after distribution of his or her interest has
          begun on or after the Member's required beginning date, as defined in
          Subparagraph 8.7(b), the remaining portion of such interest will
          continue to be distributed at least as rapidly as under the method of
          distribution being used prior to the Member's death.

     (g)  If the Member dies before distribution of his or her interest
          begins, distribution of the Member's entire interest shall be
          completed by December 31 of the calendar year containing the fifth
          anniversary of the participant's death.

     (h)  The life expectancy (or joint and last survivor expectancy) shall
          be calculated in accordance with Treasury regulations.  Life
          expectancies shall be recalculated annually.

     (i)  The distribution calendar year is a calendar year for which a minimum
          distribution is required. For distributions beginning before the
          Member's

                                      -31-
<PAGE>

          death, the first distribution calendar year is the calendar year
          immediately preceding the calendar year which contains the Member's
          required beginning date.

8.8  Distribution of Benefits
     ------------------------

     The distribution of benefits under this Plan to a Member who has
     elected to receive such benefits shall be made not later than the 60th day
     after the latest of the close of the Plan Year in which (a) the Member
     attains age 65 or such earlier normal retirement age as may be specified in
     this Plan; (b) there occurs the tenth anniversary of the year in which the
     Member commenced membership in this Plan; or (c) the Member's service with
     the Company is terminated.

                                      -32-
<PAGE>

                                   SECTION 9
                                LOANS TO MEMBERS

9.1  General
     -------

     A Member, or a Former Member who is a Party-In-Interest as defined in
     Section 3(14) of ERISA, may borrow from his or her Account in accordance
     with the terms and conditions set forth in this Section 9 and such
     additional rules, consistent with such terms and conditions, which the
     Administrator may establish from time to time.

9.2  Eligibility
     -----------

     To be eligible to apply for and receive a loan, the Member must be in
     receipt of regular Earnings.  The loan shall be irrevocable upon the
     earlier of:

     (a) Endorsement of the check representing the loan proceeds, or

     (b) Expiration of ten days from issuance of such check.

9.3  Loan Amount
     -----------

     (a)  The maximum loan shall be the lesser of one half of the Member's
          Account or $50,000 (reduced by the highest balance, at any specific
          time, of any outstanding loan or loans during the preceding 12 months
          from this Plan).

     (b)  A loan must be in cash, in increments of $100 and in an amount not
          less than $1,000.

     (c)  The maximum loan amount shall be reduced to the extent necessary
          to prevent each installment of the loan payment, including principal
          and interest, when added to installments under any outstanding loan
          under the Plan, from exceeding 25 percent of a Member's biweekly
          earnings.

     (d)  The loan amount may not exceed the lesser of (i) the amount of the
          Member's Contributions, Elective Deferrals and Company Contributions
          under the Atlantic Richfield Savings Plans II and III made prior to
          July 1, 1988 (excluding assets which originated in the Atlantic
          Richfield Employee Stock Ownership Plan), and earnings thereon at the
          time the loan is made, or (ii) the amount of the security, as
          described hereafter, for the loan.

     (f)  For purposes of this Paragraph 9.3, the value of Common Stock, or any
          other investment alternative will be determined on the Valuation Date
          immediately preceding the date the loan application is received by the
          Administrator under rules established by the Administrator.

                                      -33-
<PAGE>

9.4  Number of Loans
     ---------------

     A Member may have such number of loans outstanding at any time as shall be
     determined by the Administrator.

9.5  Interest Rate
     -------------

     A loan shall bear interest at a rate established and communicated by the
     Capital Accumulation Plan Administrative Committee to provide the Plan with
     a rate of return commensurate with prevailing interest rates charged on
     similar commercial loans by persons in the business of lending money.

9.6  Security
     --------

     (a)  Each loan must be evidenced by a loan agreement executed by the Member
          for the amount of the loan, including principal and interest,  payable
          to the order of the Trustee.

     (b)  Security for the loans shall equal 50 percent of the assets in the
          Member's Account as of the date of the loan request.

     (c)  The assets which constitute security for the loan will be valued on
          the date of the loan agreement, or at such other time as may be
          determined by the Administrator.

9.7  Funding of the Loan
     -------------------

     (a)  The loan will be funded in accordance with procedures established by
          the Administrator.

     (b)  Under procedures established by the Administrator, investment
          alternatives shall be sold to fund the loan.

9.8  Repayment of the Loan
     ---------------------

     (a)  As determined by the Member, but subject to the restriction in
          Subparagraph 9.3(c), a loan may be repaid over a period of one, two,
          three, four or five years or, in the case of a loan used to acquire
          the Member's principal residence, such longer term as determined by
          the Administrator and permitted under (S)72(p) of the Code.

     (b)  Principal and interest shall be amortized, on a level basis, over
          the term of the loan.

                                      -34-
<PAGE>

     (c)  Except as provided below, payments shall be made by means of
          payroll deductions, the authorization of which shall be irrevocable.

          (i)  The loan may be repaid in full at any time without penalty.

          (ii) If a Member is not in receipt of regular Earnings sufficient to
               permit repayment of the loan, or has terminated employment,
               repayment shall be made by means prescribed by the Administrator.

          Repaid principal and interest shall be credited in accordance with the
          Member's election under Paragraph 6.2.

9.9  Deemed Distribution
     -------------------

     A distribution of the unpaid principal shall be deemed to have been
     made to the Member if the Member fails to make payment under Subparagraph
     9.8(c) for a period of 90 days.

9.10 Default
     -------

     If the Member is not in receipt of regular Earnings sufficient to
     permit repayment of the loan and does not make manual repayments for a
     period exceeding 90 days, the loan will be deemed in default and the
     Administrator will realize on the security in accordance with applicable
     laws.

                                      -35-
<PAGE>

                                   SECTION 10
                                 ADMINISTRATION
               CAPITAL ACCUMULATION PLAN ADMINISTRATIVE COMMITTEE

10.1  Capital Accumulation Plan Administrative Committee
      --------------------------------------------------

     The Plan shall be administered by a Capital Accumulation Plan
     Administrative Committee.  The Committee shall consist of the Senior Vice
     President, Human Resources of Atlantic Richfield Company, who shall serve
     as Chairperson, and not less than two other persons appointed by the
     Chairperson.  Members of the Committee shall serve without compensation.
     Vacancies shall be filled by the Chairperson or the Chairperson's delegate.

10.2 Rules of Conduct
     ----------------

     The Capital Accumulation Plan Administrative Committee shall adopt
     such rules for the conduct of its business and administration of this Plan
     as it considers desirable; provided, they do not conflict with this Plan.

10.3 Legal, Accounting, Clerical
     ---------------------------

     The Capital Accumulation Plan Administrative Committee may authorize
     one or more of its members or any agent to act on its behalf and may
     contract for legal, accounting, clerical and other services to carry out
     this Plan.  Unless paid by the Company, all expenses of the Company, the
     Administrator and the Plan shall be paid by the Plan, to the extent they
     constitute reasonable expenses of administering the Plan.  The Plan may
     reimburse expenses paid directly by the Company or its designee.  This
     provision shall be deemed a part of any contract to provide for expenses of
     Plan administration, whether or not the signatory to such contract is, as a
     matter of convenience, the Company or its designee.  Notwithstanding the
     foregoing, brokerage commissions, transfer fees and other expenses actually
     incurred in any sale or purchase of Company Common Stock shall be equitably
     added to the cost or subtracted from the proceeds of all purchases or
     sales.

10.4 Interpretation of Provisions
     ----------------------------

     The Capital Accumulation Plan Administrative Committee shall have full
     discretion and final authority to determine eligibility for benefits and to
     interpret the provisions of this Plan, to decide questions arising in its
     administration, and to establish such other rules for its administration as
     may be desirable.

                                      -36-
<PAGE>

10.5 Records of Administration
     -------------------------

     The Capital Accumulation Plan Administrative Committee shall keep
     records reflecting the administration of this Plan which shall be subject
     to audit by the Company. Members may examine records pertaining directly to
     themselves.  At least annually, the Capital Accumulation Plan
     Administrative Committee shall have mailed to each Member a statement of
     his or her Account and such statement shall be deemed to have been accepted
     as correct for all purposes of this Plan unless written notice to the
     contrary is received by the Capital Accumulation Plan Administrative
     Committee or the Trustee within 30 days after the date of mailing.

10.6 Claims for Benefits
     -------------------

     Applications for benefits must be made in such manner as prescribed by
     the Administrator.  The Administrator shall have full discretion and final
     authority to determine eligibility for benefits and to construe the terms
     of the Plan in acting upon an initial application for benefits or an appeal
     of a denial of an application for benefits.  Each application shall be
     acted upon and approved or disapproved within 90 days following its receipt
     by the Administrator.  In the event special circumstances require an
     extension of time for reviewing the initial application for benefits, the
     Administrator shall make a determination as soon as practicable but no
     later than 180 days following receipt of the application.  If any
     application for benefits is denied, in whole or in part, the Administrator
     shall notify the applicant in writing of such denial and of the applicant's
     right to a review by the Administrator and shall set forth in a manner
     calculated to be understood by the applicant, specified reasons for such
     denial, specific references to pertinent Plan provisions on which the
     denial is based, a description of any additional material or information
     necessary for the applicant to perfect the application, an explanation of
     why such material or information is necessary, and an explanation of the
     Plan's review procedure.

     Any person, or a duly authorized representative thereof, whose
     application for benefits is denied in whole or in part, may appeal from
     such denial to the Administrator for a review of the decision by submitting
     to the Administrator within 60 days after receiving notice of denial, a
     written statement:

     (a) Requesting a review of the application for benefits by the
         Administrator;

     (b) Setting forth all of the grounds upon which the request for review is
         based and any facts in support thereof; and

     (c) Setting forth any issues or comments which the applicant deems relevant
         to the application.

                                      -37-
<PAGE>

     The Administrator shall act upon each such appeal application within
     60 days after the later of receipt of the applicant's request for review by
     the Administrator or receipt of any additional materials reasonably
     requested by the Administrator from such applicant.  In the event special
     circumstances require an extension of time for reviewing the appeal, the
     Administrator shall make a determination as soon as practicable but no
     later than 120 days following receipt of the appeal.

     The Administrator shall make a full and fair review of each such
     application and any written materials submitted by the applicant or the
     Company in connection therewith and may require the Company or the
     applicant to submit within 30 days of written notice by the Administrator
     therefor, such additional facts, documents, or other evidence as the
     Administrator, in its sole discretion, deems necessary or advisable in
     making such a review.  The Administrator shall have full discretion in
     making an independent determination of the applicant's eligibility for
     benefits under the Plan and shall have full discretion to construe the
     terms of the Plan in making its review.  The decision of the Administrator
     on any application for benefits shall be final and conclusive upon all
     persons.

     If the Administrator denies an application in whole or in part, the
     Administrator shall give written notice of its decision to the applicant
     setting forth in a manner calculated to be understood by the applicant the
     specific reasons for such denial and specific references to the pertinent
     Plan provisions on which the Administrator's decision was based.

10.7 Liability of Committee
     ----------------------

     No Member of the Capital Accumulation Plan Administrative Committee
     shall be liable for any action taken in good faith or for the exercise of
     any power given the Capital Accumulation Plan Administrative Committee, or
     for the actions of other members of said Committee unless and except to the
     extent that such liability is imposed under law as a result of a breach by
     such Member of his or her fiduciary responsibilities.

10.8 Unlocated Member
     ----------------

     If the Committee is unable, after reasonable and diligent effort, to
     locate a Member, Former Member or beneficiary entitled to payment under the
     Plan, such payment may be forfeited and used to offset Company
     Contributions or to pay Plan expenses.  If the Member, Former Member or
     beneficiary later files a claim for benefit, such benefit will be
     reinstated.

10.9 Legal Representative
     --------------------

     The Capital Accumulation Plan Administrative Committee shall act on
     behalf of the Plan with respect to any claim or cause of action, whether
     arising in the course of

                                      -38-
<PAGE>

     administrative or judicial proceedings or otherwise, and shall be
     responsible for initiating, pursuing and defending any such claim or cause
     of action involving the Plan.

                                      -39-
<PAGE>

                                   SECTION 11
                    AMENDMENTS, DISCONTINUANCE, LIABILITIES

11.1 Amendment
     ---------

     The Plan may be amended by the Board of Directors of CH-Twenty, Inc.,
     provided that the Plan, as amended, continues to be for the exclusive
     benefit of the Members of the Plan and that no amendment shall reduce the
     Account of any Member as of the date of such amendment.

11.2 Termination
     -----------

     CH-Twenty, Inc. intends to continue this Plan indefinitely but
     reserves the right to terminate it at any time, by action of its Board of
     Directors.  If this Plan is terminated, or if there is a complete
     discontinuance of contributions under this Plan by the Company, all amounts
     credited to Accounts of Members shall be held for distribution as provided
     in Section 8.

11.3 Liability of Company
     --------------------

     The Company shall have no liability for payments under this Plan
     except to make the contributions required by Section 4.  Any payments under
     the Plan shall be made solely from the fund held by the Trustee.

                                      -40-
<PAGE>

                                   SECTION 12
                                 MISCELLANEOUS

12.1 Employment
     ----------

     This Plan shall not give any Member any right to be continued in the
     employment of the Company.

12.2 Benefits Not Assignable
     -----------------------

     Except as provided in Paragraph 8.4, no benefit under this Plan shall
     be assignable or transferable in whole or in part, either directly or by
     operation of law or otherwise, and shall not be subject to attachment or
     other process.

12.3 Discharge of Liability
     ----------------------

     If the Administrator deems any person incapable of receiving benefits
     to which such person is entitled under this Plan, by reason of minority,
     illness, infirmity, mental incompetency or other incapacity, it may direct
     the Trustee to make payment directly for the benefit or the account of such
     person or to any eligible person selected by the Administrator to disburse
     such payment whose receipt shall be a complete settlement therefor.

12.4 Governing Laws
     --------------

     The Plan shall be governed by and construed in accordance with federal
     laws governing employee benefit plans qualified under the Code or with the
     laws of the State of Delaware to the extent not preempted by federal law.

12.5 Limitation on Mergers
     ---------------------

     This Plan may not merge or consolidate with, or transfer any of its
     assets or liabilities to any other plan unless each Member in this Plan
     would, if said other plan were to terminate, receive a benefit immediately
     after the merger, consolidation or transfer which is equal to or greater
     than the benefit such Member would have been entitled to receive
     immediately before the merger, consolidation or transfer if this Plan had
     terminated.

12.6 Delegation of Fiduciary or Administrative Responsibilities
     ----------------------------------------------------------

     CH-Twenty, Inc., by resolution of its Board of Directors or by written
     action of any officer generally or specifically named by such a resolution
     to take such an action, and the Capital Accumulation Plan Administrative
     Committee, by resolution of said Committee, may at any time delegate to any
     other named person or body, or reassume therefrom, any of their respective
     fiduciary responsibilities or

                                      -41-
<PAGE>

     administrative duties with respect to this Plan, including the power to
     delegate and reassume such responsibilities and duties by written action
     naming the person or body to whom the responsibility has been delegated.
     However, only the immediate delegate of CH-Twenty, Inc., or the Capital
     Accumulation Plan Administrative Committee, as the case may be, may, if so
     authorized by CH-Twenty, Inc., said Committee or said Treasurer, delegate
     any such responsibilities or duties.

12.7 Named Fiduciary
     ---------------

     The named fiduciary with respect to this Plan is CH-Twenty, Inc.
     except that (a) as to any matter specified in this Plan as being the
     responsibility or function of the Capital Accumulation Plan Administrative
     Committee, the named fiduciary is said Committee, (b) as to any matter
     specified in the Plan or in the Trust Agreement as being the responsibility
     or function of the Trustee or the Investment Officer of Atlantic Richfield
     Company, the named fiduciary is the Trustee or such Investment Officer, as
     the case may be, and (c) as to any matter specified in the Plan as being
     the responsibility or function of the President of CH-Twenty, Inc. the
     named fiduciary is such President.

                                      -42-
<PAGE>

                                  SECTION 13
                                   ROLLOVERS

13.1 Rollovers from Other Qualified Plans
     ------------------------------------

     An Employee who has had distributed to the Employee all or a portion
     of his or her taxable interest in a plan meeting the requirements of
     (S)401(a) of the Code, including a defined benefit retirement plan of the
     Company or a Subsidiary or Affiliate, (the "Other Plan") may, in accordance
     with procedures approved by the Capital Accumulation Plan Administrative
     Committee, rollover in cash all or a portion of the taxable distribution
     received from the Other Plan to the Plan, provided the following conditions
     are met:

     (a)  The rollover occurs on or before the 60th day after the Member
          receives the distribution from the Other Plan;

     (b)  The distribution from the Other Plan qualifies as an eligible rollover
          distribution within the meaning of (S)402(c)(4) of the Code; and

     (c)  The amount rolled over does not exceed the maximum amount which may be
          rolled over in accordance with (S)402(c)(2) of the Code.

13.2 Transfers From Individual Retirement Accounts
     ---------------------------------------------

     An Employee who receives a distribution from an individual retirement
     account described in (S)408(a) of the Code or an individual retirement
     annuity described in (S)408(b) of the Code which constitutes the entire
     amount of such account or annuity (including earnings thereon), and no
     portion of which is attributable to any source other than a distribution
     from a qualified plan described in Paragraph 13.1, may, in accordance with
     procedures approved by the Capital Accumulation Plan Administrative
     Committee, rollover in cash all or a portion of such distribution to the
     Plan, within 60 days after receiving the distribution.

13.3 Membership
     ----------

     Notwithstanding anything in the Plan to the contrary, an Employee who
     rolls over funds to the Plan pursuant to Paragraph 13.1 or 13.2, shall,
     upon such rollover, become a Member of the Plan except that the right to
     make Elective Deferrals, Member Contributions or receive Company
     Contributions will remain subject to Paragraph 2.1.

13.4 Administration
     --------------

     The Administrator shall develop such procedures, including procedures
     for obtaining information from an Employee desiring to make such a
     transfer, as it

                                      -43-
<PAGE>

     deems necessary or desirable to enable it to determine that the proposed
     rollover will meet the requirements of this section. Upon approval by the
     Capital Accumulation Plan Administrative Committee, the rollover shall be
     deposited with the Trustee in the Employee's Rollover Account.

                                      -44-
<PAGE>

                                   SECTION 14
                              TOP HEAVY PROVISIONS

If the Plan is or becomes Top Heavy in any Plan Year, the provisions of this
Section 14 will supersede any conflicting provisions in the Plan.

14.1  Definitions
      -----------

      (a) Key Employee means an Employee, former Employee or an Employee's
          ------------
          beneficiary who at any time during the determination period is:

          (i)   An officer of the Company who has annual Compensation greater
                than 50 percent of the amount in effect under (S)415(b)(1)(A) of
                the Code for the Plan Year;

          (ii)  One of the ten Employees owning (or considered as owning within
                the meaning of (S)318 of the Code) the largest interest in the
                Company; provided, such Employee's annual Compensation from the
                Company exceeds the dollar limitation under (S)415(c)(1)(A) of
                the Code.  If two or more Employees have the same ownership
                interest, the Employee with the greater annual Compensation from
                the Company for the Plan Year shall be considered to own the
                larger interest in the Company;

          (iii) A five percent owner of the Company; or

          (iv)  A one percent owner of the Company who has annual Compensation
                from the Company of more than $150,000.

          The determination period of the Plan is the Plan Year containing the
          Determination Date and the four preceding Plan Years.

          The determination of who is a Key Employee will be made in accordance
          with (S)416(i)(1) of the Code and the regulations thereunder.

      (b) Top Heavy Plan: For any Plan Year after December 31, 1983, this
          --------------
          Plan is Top Heavy if any of the following conditions exist:

          (i)   If the Top Heavy Ratio for this Plan exceeds 60 percent and this
                Plan is not part of any Required Aggregation Group or Permissive
                Aggregation Group of plans;

          (ii)  If this Plan is a part of a Required Aggregation Group of plans
                (but which is not part of a Permissive Aggregation Group) and
                the Top Heavy Ratio for the group of plans exceeds 60 percent;
                or

                                      -45-
<PAGE>

          (iii) If this Plan is a part of a Required Aggregation Group of plans
                and part of a Permissive Aggregation Group and the Top Heavy
                Ratio for the Permissive Aggregation Group exceeds 60 percent.

     (c)  Top Heavy Ratio
          ---------------

          (i)   If the Company maintains one or more defined contribution plans
                (including any Simplified Employee Pension Plan) and the Company
                has not maintained any defined benefit plan which during the
                five- year period ending on the Determination Date(s) has or has
                had accrued benefits, the Top Heavy Ratio for this plan alone or
                for the Required or Permissive Aggregation Group as appropriate
                is a fraction, the numerator of which is the sum of the account
                balances of all Key Employees as of the Determination Date(s)
                [including any part of any account balance distributed in the
                five-year period ending on the Determination Date(s)], and the
                denominator of which is the sum of all account balances
                [including any part of any account balance distributed in the
                five-year period ending on the Determination Date(s)], both
                computed in accordance with (S)416 of the Code and the
                regulations thereunder. Both the numerator and denominator of
                the Top Heavy Ratio are adjusted to reflect any contribution not
                actually made as of the Determination Date, but which is
                required to be taken into account on that date under (S)416 of
                the Code and the regulations thereunder.

          (ii)  If the Company maintains one or more defined contribution plans
                (including any Simplified Employee Pension Plan) and the Company
                maintains or has maintained one or more defined benefit plans
                which during the five-year period ending on the Determination
                Date(s) has or has had any accrued benefits, the Top heavy Ratio
                for any Required or Permissive Aggregation Group as appropriate
                is a fraction, the numerator of which is the sum of account
                balances under the aggregated defined contribution plan or plans
                for all Key Employees, determined in accordance with
                Subparagraph 14.1(c)(i), and the Present Value of accrued
                benefits under the aggregated defined benefit plan or plans for
                all Key Employees as of the Determination Date(s), and the
                denominator of which is the sum of the account balances under
                the aggregated defined contribution plan or plans for all
                Members, determined in accordance with Subparagraph 14.1(c)(i),
                and the Present Value of accrued benefits under the defined
                benefit plan or plans for all Members as of the Determination
                Date(s), all determined in accordance with (S)416 of the Code
                and the regulations thereunder. The accrued benefits under a
                defined benefit plan in both the numerator and denominator of
                the

                                      -46-
<PAGE>

                Top Heavy Ratio are adjusted for any distribution of an accrued
                benefit made in the five-year period ending on the Determination
                Date.

          (iii) For purposes of Subparagraphs 14.1(c)(i) and (c)(ii), the value
                of account balances and the Present Value of accrued benefits
                will be determined as of the most recent Valuation Date that
                falls within or ends with the 12-month period ending on the
                Determination Date except as provided in (S)416 of the Code and
                the regulations thereunder for the first and second Plan Years
                of a defined benefit plan. The account balances and accrued
                benefits of a Member (A) who is not a Key Employee but who was a
                Key Employee in a prior-year, or (B) effective January 1, 1985,
                who has not been credited with at least one Hour of Service with
                a Company maintaining the Plan at any time during the five-year
                period ending on the Determination Date will be disregarded. The
                calculation of the Top Heavy Ratio, and the extent to which
                distributions, rollovers and transfers are taken into account
                will be made in accordance with (S)416 of the Code and the
                regulations thereunder. Deductible Member Contributions will not
                be taken into account for purposes of computing the Top Heavy
                Ratio. When aggregating plans, the value of account balances and
                accrued benefits will be calculated with reference to the
                Determination Dates that fall within the same calendar year.

          (iv)  The accrued benefit of a Member other than a Key Employee shall
                be determined under the method, (A) if any, that uniformly
                applies for accrual purposes under all defined benefit plans
                maintained by the Company, or (B) absent such method, as if such
                benefits accrued not more rapidly than the slowest accrued rate
                permitted under the fractional rule of (S)411(b)(1)(C) of the
                Code.

     (c)  Permissive Aggregation Group:  The Required Aggregation Group of plans
          ----------------------------
          plus any other plan or plans of the Company which, when considered as
          a group with the Required Aggregation Group, would continue to satisfy
          the requirements of (S)401(a)(4) and (S)410 of the Code.

     (e)  Required Aggregation Group means:
          --------------------------

          (i)   Each qualified plan of the Company in which at least one Key
                Employee participates or participated at any time during the
                determination period (regardless of whether the plan
                terminated); and

                                      -47-
<PAGE>

          (ii)  Any other qualified plan of the Company which enables a plan
                described in Subparagraph 14.1(e)(i) to meet the requirements of
                (S)401(a)(4) or (S)410 of the Code.

     (f)  Determination Date means for any Plan Year the last day of the
          ------------------
          preceding Plan Year.  For the first Plan Year of the Plan, the last
          day of that year.

     (g)  Valuation Date means December 31 of each year.
          --------------

     (h)  Present Value: Present Value shall be based on interest rate and
          -------------
          the mortality tables specified in the Company's defined benefit plan.

     (i)  Compensation means all compensation, as that term is defined for
          ------------
          (S)415 purposes, but including amounts contributed by the Company
          pursuant to Employee Contribution Agreements which are excludable from
          the Employee's income under Code (S)125, (S)402(e)(3), (S)402(h) and
          (S)403(b).

14.2 Minimum Allocation
     ------------------

     (a) Except as otherwise provided in Subparagraphs 14.2(b), (c) and (d), the
         Company Contribution allocated on behalf of any Member who is not a Key
         Employee shall not be less than the lesser of three percent of such
         Member's Compensation or in the case where the Company has no defined
         benefit plan which designates this Plan to satisfy (S)401 of the Code,
         the largest percentage of Company Contribution, as a percentage of the
         first $150,000 of the Key Employee's Compensation, allocated on behalf
         of any Key Employee for that year. The minimum allocation is determined
         without regard to any Social Security contribution. This minimum
         allocation shall be made even though, under other Plan provisions, the
         Member would not otherwise be entitled to receive an allocation, or
         would have received a lesser allocation for the year because of (i) the
         Member's failure to complete 1,000 Hours of Service, or (ii) the
         Member's failure to make mandatory Member Contributions to the Plan, or
         (iii) Compensation less than a stated amount.

     (b) The provision in Subparagraph 14.2(a), shall not apply to any Member
         who was not employed by the Company on the last day of the Plan Year.

     (c) If Members of this Plan are covered by one or more defined benefit
         plans maintained by the Company or its Subsidiaries, the minimum
         allocation or benefit requirements applicable to Top Heavy plans shall
         first be met by such defined benefit plan or plans.

                                      -48-
<PAGE>

     (d) If Members of this Plan are covered by one or more defined contribution
         plans maintained by the Company or its Subsidiaries, and are not
         covered by any defined benefit plans of the Company or its
         Subsidiaries, the minimum allocation requirement will be met by the
         defined contribution plan in which the Employee is an active Member in
         the following order:

          1.   Money Purchase Pension Plan
          2.   Profit Sharing Plan, and
          3.   Stock Bonus Plan

     (e)  For purposes of satisfying the minimum allocation requirements of
          this Paragraph 14.2, Elective Deferrals and Matching Contributions may
          not be taken into account.

14.3 The minimum accrued benefit required [to the extent required to be
     nonforfeitable under (S)416(b)] may not be suspended or forfeited under
     Code (S)411(a)(3)(B) or (S)411(a)(3)(D).

14.4 For any Plan Year in which the Plan is Top Heavy, only the first $150,000
     (or such larger amount as may be prescribed by the Secretary of Treasury or
     the Secretary's delegate) of each Member's annual Compensation will be
     taken into account for purposes of determining benefits under the Plan.

14.5 In any Plan Year in which the Top Heavy Ratio exceeds 60 percent the
     denominators of the defined benefit fraction and defined contribution
     fraction [as previously defined in the Plan] shall be computed using 100
     percent of the dollar limitation instead of 125 percent.  The preceding
     sentence shall not apply to an Employee so long as there are no:

     (a)  Company Contribution, forfeitures or voluntary nondeductible
          contributions allocated to such Employee, or

     (b)  Accruals for such Employee under any qualified defined benefit plan.

14.6 In determining the highest rate of contribution applicable to any Key
     Employee, amounts that such Key Employee elects to defer under an
     arrangement qualified under (S)401(k) of the Code will be counted for the
     purposes of (S)416 of the Code.

                                      -49-
<PAGE>

                                CH-Twenty, Inc.
                           CAPITAL ACCUMULATION PLAN



To record the adoption of the amended and restated CH-Twenty, Inc. Capital
Accumulation Plan, effective March 15, 1999, the undersigned, being duly
authorized to act on behalf of CH-Twenty, Inc. has executed this plan document
at Los Angeles, California on the 9th day of July, 1999.



ATTEST:                                             CH-TWENTY, INC.



BY:  [Armineh Simonian]                      BY:   [Alan L. Comstock]
     ------------------                          ------------------------------
                                                    Alan L. Comstock
                                                    President

<PAGE>

                                                                    Exhibit 10.3

                               AMENDMENT NO. 12
                                       TO
                           ATLANTIC RICHFIELD COMPANY
                    1985 EXECUTIVE LONG-TERM INCENTIVE PLAN
                         _____________________________

Pursuant to the power of amendment reserved therein, the Atlantic Richfield
Company 1985 Executive Long-Term Incentive Plan (the "Plan") is hereby amended
effective immediately.

1.   With respect to Performance Periods which commence before and end after
January 1, 1999, as to the portion of such Performance Period occurring on and
after January 1, 1999, and with respect to any Performance Periods which
commence on or after January 1, 1999, as to the entire Performance Period,
Article I, Subsection 2(f) the Plan is amended to read as follows:

          "(f) "Comparison Group" means Chevron Corporation, Conoco Inc., Exxon
     Corporation, Mobil Corporation, Occidental Corporation, Phillips Petroleum
     Company, Texaco Inc. and Unocal Corporation; provided, however, that if any
     member of the Comparison Group ceases to exist during a Performance Period
     ("Terminated Member") the Organization and Compensation Committee of the
     Board of Directors (the "Committee") shall designate another entity as a
     member of the Comparison Group ("New Member"), which entity shall have
     characteristics as common as possible with the existing members of the
     Comparison Group, as determined in the sole discretion of the Committee;
     provided, that the performance of the Terminated Member shall be used to
     calculate the Company Performance Ranking through the date it ceased to
     exist and the performance of the New Member shall be used to calculate the
     Company Performance Ranking for the remainder of the Performance Period."

2.   Article I, Subsection 2(aa) of the Plan is amended to read as follows:

          "(aa) "Anticipatory Change of Control" means (i) the execution of an
     agreement or a written document which, if the subject thereof were
     consummated, would result in a Change of Control; (ii) a public
     announcement by any Person, including ARCO, of an intent to take an
     action(s) which, if consummated, would result in a Change of Control; or
     (iii) the delivery of a signed, written statement to the Trustee of the
     Change of Control Trust and ARCO's Independent Auditor by the Chief
     Financial Officer of ARCO and General Counsel of ARCO that an Anticipatory
     Change of Control is in effect, provided that, with respect to any of the
     above three circumstances, the Anticipatory Change of Control shall
     commence only upon approval either by the Board or the Executive Committee
     of the Board."

Executed this 23rd day of March, 1999.

ATTEST                                        ATLANTIC RICHFIELD COMPANY


BY:      [Armineh Simoanian]                    BY:  [John H. Kelly]
     ---------------------------                    ---------------------------
                                                     JOHN H. KELLY
                                                     Senior Vice President
                                                     Human Resources

<PAGE>

                                                                    Exhibit 10.4


                               AMENDMENT NO. 13
                                       TO
                           ATLANTIC RICHFIELD COMPANY
                    1985 EXECUTIVE LONG-TERM INCENTIVE PLAN
                         _____________________________

Pursuant to the power of amendment reserved therein, the Atlantic Richfield
Company Executive Long-Term Incentive Plan is amended, effective immediately,
with respect to any Anticipatory Change of Control or Change of Control related
to a merger of a subsidiary of BP Amoco p.l.c. with and into Atlantic Richfield
Company (the "ARCO-BP Merger"), as follows:.

1.   The introductory language under Article 1, Section 2(b)(i) of the Plan is
amended to eliminate footnote No. 1 and read as follows:

     "(i)  Consummation of a reorganization, merger or consolidation or sale of
          all or substantially all of the assets of ARCO (a "Business
          Combination"), unless, in each case, following such Business
          Combination:"

2.   Article II, Section 2(f) of the Plan is amended to read as follows:

     "(f)  Change of Control.  Except as to any grant of Stock Options after the
          commencement of an Anticipatory Change of Control related to a merger
          between Atlantic Richfield Company and BP Amoco, upon the occurrence
          of a Change of Control, a participant shall be entitled to exercise
          any outstanding Stock Options which are not otherwise exercisable
          immediately preceding such a Change of Control."

3.   Article III, Section 4(c) of the Plan is amended to read as follows:

     "(c)  Except as to any grant of Restricted Stock or Performance-Based
         Restricted Stock after the commencement of an Anticipatory Change of
         Control related to a merger between Atlantic Richfield Company and BP
         Amoco, all shares of Restricted Stock and Performance-Based Restricted
         Stock shall be deemed vested upon the occurrence of a Change of
         Control."

4.   Article III, Section 3(b)(v) of the Plan is amended to read as follows:

     "(v)  (1)  If a Change of Control occurs following any grant of Contingent
          Restricted Stock, any actual award of Performance-Based Restricted
          Stock to which the grantee would otherwise be entitled in respect of
          such Contingent Restricted Stock, based on the Company's Performance
          Ranking for the year of the Performance Period on the date of the
          Change of Control under the applicable Restricted Stock Payment
          Schedule, shall be satisfied by the grant of shares of Common Stock.
          The number of

                                       1
<PAGE>

          shares shall be determined by multiplying the Contingent Restricted
          Stock by a fraction, the numerator of which is the number of completed
          months (or fraction thereof) in the Performance Period as of the date
          of the Change of Control and the denominator of which is the number of
          months in such Performance Period. However, if such Contingent
          Restricted Stock is granted after the commencement of an Anticipatory
          Change of Control related to a merger of a subsidiary of BP Amoco
          p.l.c. with and into Atlantic Richfield Company, such grant shall be
          satisfied by the grant of Performance-Based Restricted Stock subject
          to normal employment circumstances."

Executed this 31st day of March, 1999.

ATTEST                                        ATLANTIC RICHFIELD COMPANY



BY:      [Diane Thompson]                     BY:  [John H. Kelly]
     ------------------------                     ------------------------
                                                   JOHN H. KELLY
                                                   Senior Vice President
                                                   Human Resources

                                       2

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<MULTIPLIER> 1,000,000

<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          SEP-30-1999
<PERIOD-END>                               SEP-30-1999
<CASH>                                             745
<SECURITIES>                                       246
<RECEIVABLES>                                    1,504
<ALLOWANCES>                                         0
<INVENTORY>                                        427
<CURRENT-ASSETS>                                 3,146
<PP&E>                                          40,033
<DEPRECIATION>                                (21,470)
<TOTAL-ASSETS>                                  25,827
<CURRENT-LIABILITIES>                            4,296
<BONDS>                                          5,691
                                0
                                          1
<COMMON>                                           816
<OTHER-SE>                                       7,287
<TOTAL-LIABILITY-AND-EQUITY>                    25,827
<SALES>                                          8,885
<TOTAL-REVENUES>                                 9,313
<CGS>                                            6,837
<TOTAL-COSTS>                                    7,119
<OTHER-EXPENSES>                                   195
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 288
<INCOME-PRETAX>                                  1,215
<INCOME-TAX>                                       382
<INCOME-CONTINUING>                                808
<DISCONTINUED>                                      42
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                       850
<EPS-BASIC>                                      $2.64
<EPS-DILUTED>                                    $2.59


</TABLE>


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