UNOCAL CORP
8-K, 1997-01-03
PETROLEUM REFINING
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                       SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC. 20549



                                    FORM 8-K



                             Current Report Pursuant
                          to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934



Date of report (Date of earliest event reported)     December 16, 1996
                                                    ----------------------



                               UNOCAL CORPORATION
- --------------------------------------------------------------------------------

             (Exact name of registrant as specified in its charter)



                                    Delaware
- --------------------------------------------------------------------------------
                 (State or Other Jurisdiction of Incorporation)



           1-8483                                       95-3825062
- --------------------------------------------------------------------------------
(Commission File Number)                   (I.R.S. Employer Identification No.)



2141 Rosecrans Avenue, Suite 4000, El Segundo, California               90245
- --------------------------------------------------------------------------------

(Address of Principal Executive Offices)                             (Zip Code)



                                 (310) 726-7600
- --------------------------------------------------------------------------------
              (Registrant's Telephone Number, Including Area Code)




<PAGE>





Item 5.           Other Events.






On December 16, 1996, the following news release was issued:




                      UNOCAL, TOSCO SIGN AGREEMENT FOR SALE
                    OF UNOCAL'S WEST COAST DOWNSTREAM ASSETS
                    ----------------------------------------


         El Segundo, Calif., Dec. 16, 1996 -- Unocal Corporation today said that
its Union Oil Company of California  subsidiary and Tosco  Corporation  signed a
definitive  agreement  for the sale of Unocal's West Coast  petroleum  refining,
marketing and  transportation  assets.  The sale is valued at  approximately  $2
billion.

         The assets to be sold are  currently  operated  by Unocal's 76 Products
Company business unit, which is headquartered in Costa Mesa,  Calif. The company
expects the sale to close in the first quarter 1997.

         "This  sale  is  an  important  step  in  Unocal's  transition  from  a
mid-sized,  regional  integrated  oil  company  to  being  the  world's  largest
independent  oil and gas  producer  with a major focus on project  development,"
said Roger C. Beach,  Unocal  chairman and chief executive  officer.  "With this
sale,  we look to shifting  significant  resources  to  potentially  high-return
opportunities in the fast-growing  economies of Asia and strengthen our resource
base in the Louisiana/Gulf of Mexico region."

         The  company has said it expects to use the  proceeds  from the sale to
invest in new  projects,  reduce  debt by about $800  million and buy back up to
$400 million of the company's common stock.

         The fixed assets to be sold include Unocal's  California  refineries in
San Francisco,  Santa Maria and Los Angeles,  which have a combined  capacity of
251,000-barrels per day; various terminals, bulk plants and pipelines;  Unocal's


                                       2
<PAGE>

lubricants  business;  Unocal's  retail  marketing  business,   including  1,100
controlled sites and 250 unbranded,  non-controlled sites in six Western states;
the company's commercial and industrial petroleum products business; credit card
systems; and other assets.

     Unocal  expects to record a $375 million  aftertax  book loss in the fourth
quarter 1996 as a result of the sale.

         The sale is subject to approval by Tosco  shareholders and clearance by
various regulatory  agencies,  and the satisfaction of certain other conditions.
Tosco plans to use debt and equity financing for the purchase.


                                       3
<PAGE>




ITEM 7.         FINANCIAL STATEMENTS AND EXHIBITS.

         (c)    EXHIBITS
      
2.1            Sale  and  Purchase  Agreement  for 76  Products  Company,  dated
               December 14, 1996,  between Union Oil Company of  California  and
               Tosco Corporation (without attachments or schedules).

2.2            Form of Stock Purchase and Shareholder Agreement,  to be dated as
               of January 15, 1997, by and between Tosco  Corporation  and Union
               Oil Company of California, together with form of Supplement No. 1
               thereto.

2.3            Form of  Environmental  Agreement,  to be dated as of the closing
               date, by and between  Union Oil Company of  California  and Tosco
               Corporation (without schedules.


                                       4
<PAGE>




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.




                                                  UNOCAL CORPORATION
                                                     (Registrant)




Date: January 3, 1997                           By: /s/ CHARLES S. MCDOWELL
- -----------------------                           ---------------------------
                                                  Charles S. McDowell,
                                                  Vice President and Comptroller




                                       5
<PAGE>



                               UNOCAL CORPORATION
                                  EXHIBIT INDEX

2.1            Sale  and  Purchase  Agreement  for 76  Products  Company,  dated
               December 14, 1996,  between Union Oil Company of  California  and
               Tosco Corporation (without attachments or schedules).

2.2            Form of Stock Purchase and Shareholder Agreement,  to be dated as
               of January 15, 1997, by and between Tosco  Corporation  and Union
               Oil Company of California, together with form of Supplement No. 1
               thereto.

2.3            Form of  Environmental  Agreement,  to be dated as of the closing
               date, by and between  Union Oil Company of  California  and Tosco
               Corporation (without schedules. 





                                       6




                                                                     EXHIBIT 2.1




                           SALE AND PURCHASE AGREEMENT

                                       FOR

                               76 PRODUCTS COMPANY

                                     BETWEEN

                         UNION OIL COMPANY OF CALIFORNIA

                                       AND

                                TOSCO CORPORATION

                                December 14, 1996



<PAGE>

                                                         
                                TABLE OF CONTENTS

                                                                            Page

1.   Sale and Purchase of Assets.............................................  1
2.   Excluded Assets.........................................................  2
3.   Purchase Price..........................................................  3
4.   Adjustments.............................................................  4
5.   Payment of Purchase Price...............................................  4
6.   Inventory...............................................................  6
7.   Assumption of Obligations; Retained Liabilities.........................  6
8.   Related Agreements......................................................  8
9.   Permits, Contracts, Etc.................................................  9
10.  Closing.................................................................  9
11.  Conditions Precedent to Closing......................................... 12
12.  Cooperation............................................................. 14
13.  Seller's Representations and Warranties................................. 15
14.  Purchaser's Representations and Warranties.............................. 20
15.  Environmental Agreement................................................. 21
16.  Condition of Assets..................................................... 22
17.  Objections to Title; Title Insurance.................................... 22
18.  Opinions of Counsel..................................................... 23
19.  Risk of Loss............................................................ 25
20.  Termination; Remedies upon Default or Termination....................... 26
21.  Updating of Representations and Warranties; Adjustment
     of Purchase Price....................................................... 27
22.  Indemnification......................................................... 27
23.  Limitations of Liability................................................ 30
24.  Records and Assistance.................................................. 30
25.  Access to 76 Assets After Closing....................................... 31
26.  Inspections............................................................. 31
27.  Operations of the Products Company and Actions.......................... 32
28.  Publicity............................................................... 32
29.  Employees and Benefits.................................................. 32
30.  Transfer of Permits..................................................... 35
31.  Certain Tax Matters, Etc................................................ 35
32.  Bulk Sales.............................................................. 37
33.  Construction............................................................ 37
34.  Entire Agreement........................................................ 37
35.  Assignment.............................................................. 37
36.  Further Assurances...................................................... 38
37.  Payments................................................................ 38
38.  Notices................................................................. 38
39.  Counterparts............................................................ 39
40.  Waiver.................................................................. 39
41.  Amendments.............................................................. 39
42.  Time of Essence......................................................... 39
43.  Independent Decisions................................................... 39
44.  Glossary................................................................ 40

                                       i.

<PAGE>

                                                         

                       INDEX TO ATTACHMENTS AND SCHEDULES


Attachment 
    No.          Description                            Section References

  I ....... Financial Statements .......................1(a), 13(t)
  II ...... Real Property ..............................1(a), 13(e)
 III ...... Pipelines ..................................1(a), 13(f)
  IV ...... Equipment ..................................1(a), 13(h)
  V ....... [Intentionally Omitted] ....................--
  VI ...... Vessels ....................................1(a)
 VII ...... Material Contracts and Franchises ..........1(a), 13(k), 13(l)(ii)
 VIII ..... Subsidiaries and Investments ...............1(a), 13(a)(ii)
  IX ...... Inventory Determination and Settlement .....1(a), 6
  X ....... Title Exceptions ...........................1(b)
  XI ...... Shared Software License Agreement ..........2(b), 8(a)(ii)
 XII ...... Participation Payment Agreement ............3(c)
 XIII ..... Escrow Agreement ...........................5(a)
 XIV ...... Stock Purchase and Shareholder Agreement ...5(a)
  XV ...... Intellectual Property Agreement ............8(a)
 XVI ...... [Intentionally Omitted] ....................--
 XVII ..... [Intentionally Omitted] ....................--
XVIII ..... Refineries Capacities ......................11(a)(vi)(1), 13(i)
 XIX ...... [Intentionally Omitted] ....................--
  XX ...... Permits and Consents .......................13(c)
 XXI ...... Capital Projects ...........................13(g), 27
 XXII ..... Environmental Agreement ....................15
XXIII ..... Major Refinery Turnarounds and Tank Work ...27

Schedule
  No.      Description                                  Section References


 13(d) ....Seller's Breach Exceptions ..................13(d)
 13(j) ....Compliance with Laws ........................13(j)
 13(l) ....Intellectual Property .......................13(l)
 13(m) ....Actions and Proceedings .....................13(m)
 13(n) ....Labor Relations .............................13(n)
 14(c) ....Purchaser's Consents ........................14(c)
 14(d) ....Purchaser's Breach Exceptions ...............14(d)
 14(e) ....Purchaser's Action
           and Proceedings .............................14(e)
 27 .......Permitted Transactions ......................27

                                      ii.
<PAGE>




                                                         

                           SALE AND PURCHASE AGREEMENT



                  THIS AGREEMENT is made the 14th day of December, 1996, between
UNION OIL COMPANY OF CALIFORNIA, a corporation of the State of California,  with
its principal place of business in California ("Seller"), and TOSCO CORPORATION,
a corporation  of the State of Nevada,  with its principal  place of business in
Connecticut ("Purchaser").


                               W I T N E S S E T H

                  WHEREAS,   Seller  is  engaged  in  refining,   marketing  and
transportation  of petroleum  products  through its 76 Products Company business
segment ("Products Company");

                  WHEREAS,  Seller  desires to sell,  and  Purchaser  desires to
purchase,  the business and assets constituting the Products Company,  except as
specifically excluded herein.

                  NOW,  THEREFORE,   in  reliance  on  the  representations  and
warranties  and the mutual  promises and covenants  hereinafter  set forth,  and
subject to the terms and conditions hereof, the parties hereto agree as follows:

     1. Sale and  Purchase of Assets.  (a) At the  Closing  (as defined  below),
     --------------------------------
Seller shall sell,  transfer,  assign and deliver to  Purchaser,  and  Purchaser
shall purchase and acquire from Seller, all of (i) the right, title and interest
of Seller and Seller's  affiliates  in and to the  businesses  and assets of the
Products  Company (the "76 Assets")  (other than  Inventory  described in clause
(ii) below),  constituting  generally the businesses and assets reflected in the
Audited  Financial   Statements  (as  defined  in  Section  13(t))  included  in
Attachment I, subject to changes in the ordinary course of business,  including,
without  limitation,  the real  property set forth in  Attachment II hereto (the
"Real  Property") and the permanent  structures and other  improvements  thereon
owned or leased by Seller  (the  "Improvements"),  the  pipelines  described  in
Attachment III hereto (the "Pipelines"),  the equipment,  including spare parts,
set forth in Attachment IV hereto (the "Equipment"),  the intellectual  property
owned by Seller or its affiliates  and used in the business of Products  Company
as set  forth in the  schedules  to  Attachment  XV  hereto  (the  "Intellectual
Property"),  such transfer to be made in the form of an assignment or license as
specified  in  Section  8(a),  the three  oceangoing  vessels  as  described  on
Attachment VI (the  "Vessels"),  the  contracts  and  franchises of the Products
Company (the  "Contracts"),  including  those  Material  Contracts  set forth in
Attachment  VII hereto,  all  investments  in  subsidiaries  and other  entities
included in the  operations  of the Products  Company as set forth on Attachment

                                       1
<PAGE>


VIII ("Subsidiaries"),  the assets,  Contracts and systems constituting Seller's
credit card systems  (including  co-branded cards) and any other assets owned by
Seller which are part of the Products Company or necessary to the conduct of its
operations,  including  normal spare parts and service  station  merchandise and
certain tank bottoms and linefill;  and (ii) the Products Company inventories of
hydrocarbons,  usable  catalysts  and precious  metals in  storehouses,  whether
onsite or offsite,  determined as provided in Attachment  IX  (hereinafter,  the
"Inventory").

     (b) Seller  shall convey to  Purchaser  marketable  fee simple title or its
leasehold or other  interests in and to the Real Property and the  Improvements,
subject only to the  encumbrances and other exceptions set forth in Attachment X
hereto and other  encumbrances  and liens,  which together do not  significantly
adversely affect the use of the Real Property and Improvements as presently used
by Seller, or otherwise as provided in Section 17 (the "Permitted  Exceptions").
Purchaser  shall have the right to obtain title insurance as provided in Section
17(d). Seller will use reasonable efforts, both pre-Closing and post-Closing, to
resolve any curable  defects in title  appearing of record,  and Purchaser shall
cooperate in such efforts.

     (c) The Equipment  and the Inventory  shall be free and clear of any defect
in title, and of any claim,  charge,  option,  lien, chattel mortgage,  security
interest, encumbrance, reservation or restriction.

     (d) Seller shall assign to Purchaser the Contracts which are assignable, or
otherwise make  available the benefits  thereof as provided in Section 9 hereof,
and Purchaser  agrees to assume,  pay,  perform and discharge  when due Seller's
obligations  under the  Contracts  to the extent  provided in Sections  7(a) and
7(b).

     (e) The assets  conveyed to Purchaser by Seller  hereunder  shall  include,
without limitation,  all of Seller's warranties,  books, records, files and data
relating to the 76 Assets.

     (f) Seller  shall,  after  collection of its accounts  receivable  from the
affected dealers and customers, transfer to Purchaser an amount of cash equal to
the  aggregate  amount of dealer  and  customer  deposits  with  respect  to the
obligations assumed by Purchaser pursuant to Section 7(a)(iii).

     (g)  Seller  shall  transfer  to  Purchaser  all  notes   receivable   from
distributors and dealers ("Self-Amortizing Notes").

     2. Excluded Assets.  Notwithstanding Section 1, it is agreed that Seller is
not selling, and Purchaser is not purchasing,  hereunder the following assets of
Seller and its Subsidiaries (the "Excluded Assets"):

     (a) Cash (except as provided in Section  1(f)) and  marketable  securities,
whether on deposit or in transit.

                                       2
<PAGE>

     (b) All Seller systems and software which are not used  exclusively  for or
necessary for operation of the 76 Assets;  provided,  however,  that Seller will
grant a paid up, royalty free (for three years),  license to use all proprietary
software  owned by Seller and used  jointly  in both the 76 Assets and  Seller's
other  businesses  on  substantially  the terms set forth on  Attachment XI (the
"Shared Software License Agreement").

     (c) Seller's confidential operating manuals and policy manuals except those
useful or necessary for the operation of the 76 Assets.

     (d) Accounts and notes  receivable and credit balances on accounts  payable
relating to the  businesses  conducted  using the 76 Assets prior to the Closing
Date;  provided,  however,  that  all  amounts  with  respect  to  interest  and
amortization  payments (if any) by distributors  and dealers on  Self-Amortizing
Notes with respect to the period  after the Closing  shall be for the account of
Purchaser  and the right to such  payments is included  in the  Purchase  Price;
provided,  further that for a period of 120 days Purchaser  shall cooperate with
Seller in  collecting  receivables  outstanding  as of the Closing  Date for the
benefit of Seller,  and  Purchaser  shall  remit  amounts  which it  receives on
account of such receivables to Seller not less frequently than weekly.

     (e) Assets owned by Seller in the nature of central staff services (meaning
the legal,  cash  management,  treasury,  tax,  insurance,  health  and  safety,
environmental  management  and pension  services),  employee  records,  employee
benefits funds and plans presently provided to the 76 Assets by Seller or one of
its  subsidiaries,  including  without  limitation  employee  and other  records
necessary  to  administer  payrolls  and benefit and welfare  plans  retained by
Seller and all information  necessary to file tax returns;  provided that Seller
shall make available its  information  with respect to employees as specified in
Section 29.

     (f) Insurance proceeds and state underground  storage tank reimbursement or
other  reimbursements,  except claims  related to tank  replacement  paid for by
Purchaser.

     (g) Tax and fee refunds arising out of taxes and fees paid by Seller.

     (h) Seller's and its  subsidiaries'  employee  benefit plans and all assets
related thereto.

     (i)  Books  and  records   with  respect  to  Excluded   Assets,   Retained
Liabilities, employees and former employees of Seller.

     3. Purchase Price.  Purchaser shall pay Seller for the Products Company the
following consideration (the "Purchase Price"):

     (a) $1.4  billion  in cash at closing or as set forth in Section 5 (subject
to adjustment as set forth in Section 4)(the "Base Purchase Price");

                                       3
<PAGE>

     (b) The value of the Inventory as provided in Section 6;

     (c) Up to an additional $250 million in the form of participation  payments
as set forth in Attachment XII (the "Participation Payment Agreement");

     (d)  Assumption of certain  environmental  liabilities  as set forth in the
Environmental Agreement provided for in Section 15 below;

     (e) The outstanding  principal balance on all Self-Amortizing  Notes issued
after  the date of this  Agreement  in  accordance  with past  practices  and as
discussed with Purchaser; and

     (f) Such additional amounts for employee severance payments as provided for
in Section 29 below.

     4. Adjustments. The following items shall be apportioned between Seller and
Purchaser,  with Seller  obligated for any charges  applicable for periods on or
before the Closing Date and Purchaser  obligated for any charges  applicable for
periods after the Closing Date:

     (a) ad valorem taxes, real property taxes, personal property taxes, special
assessments,  direct  assessments,  general  assessments and similar obligations
(and any refunds, credits and the like) with respect to the 76 Assets;

     (b) charges for gas, electricity,  water, sewerage, telephone and all other
utilities;

     (c) any other charges and credits which cover a period of time which begins
prior to the Closing Date and extends beyond the Closing Date; and

     (d) interest, if any, accrued on the Self-Amortizing Notes.

                  If any of the amounts to be  apportioned in this Section 4 are
not readily determinable as of the time of Closing,  such apportionments  shall,
to the  extent  necessary,  be  based on  Seller's  and  Purchaser's  reasonable
estimate thereof. Purchaser and Seller shall cooperate with each other in making
the  calculations  upon which  amounts are to be allocated in favor of Seller or
Purchaser,  as the  case  may  be.  Such  apportionments  made on the  bases  of
estimates shall be  recalculated  as soon as possible after the  availability of
required  information,  and any overpayments or  underpayments  due either party
shall be adjusted by suitable  payments of one to the other.  The parties  shall
cooperate to complete final apportionment within 60 days of the Closing Date, if
practicable.

     5. Payment of Purchase. The Purchase  Price for the 76 Assets shall be paid
     -----------------------
as follows:

                                       4
<PAGE>

     (a) Escrow  Deposit on January 15,  1997.  The parties  shall enter into an
Escrow Agreement with Chase Manhattan Bank ("Escrow Agent") in the form attached
hereto as Attachment  XIII (the "Escrow  Agreement")  on or prior to January 15,
1997 (the "Escrow").  On January 15, 1997,  Purchaser shall deposit $1.4 billion
of value into the Escrow, of which at least $1.0 billion shall be cash.  Instead
of delivering  cash for the difference  between the amount so deposited and $1.4
billion,  Purchaser  may  elect to  deposit  a Stock  Purchase  and  Shareholder
Agreement  (the  "Shareholder   Agreement")  in  the  form  attached  hereto  as
Attachment XIV. Purchaser may deposit additional cash in the Escrow from time to
time on or prior to the Closing Date. The Shareholder Agreement provides for the
delivery  to Seller of a number of  shares  of common  stock of  Purchaser  (the
"Shares") on the Closing Date which would have a Market  Value  (defined  below)
equal to the  amount by which (i) the  amount of cash then in the Escrow is less
than (ii) the Base  Purchase  Price due and owing to Seller on the Closing  Date
pursuant  to Section  3(a).  However,  Purchaser  shall not be required to issue
Shares at a Market Price of less than $45.  Purchaser shall use its best efforts
to obtain approval of its  shareholders  for the issuance of the Shares pursuant
to the  Shareholder  Agreement  and to  obtain  approval  of the New York  Stock
Exchange  for the listing of the  Shares,  subject  only to  official  notice of
issuance,  on or by February 17, 1997.  "Market Price" shall mean the average of
the daily  averages of the high and low trading  prices for  Purchaser's  common
stock  reported  on the New  York  Stock  Exchange  Composite  tape  for the ten
business  days  preceding the Closing  Date,  and "Market  Value" shall mean the
Market Price  multiplied by the number of Shares to be  delivered.  If Purchaser
deposits the Shareholder  Agreement in the Escrow, then until Purchaser deposits
a total of $1.4  billion in cash,  Seller  shall be  permitted  to  conduct  due
diligence with respect to Purchaser and its common stock. In conducting such due
diligence,  Purchaser shall allow Seller and its employees,  agents and advisors
access to Purchaser's  facilities,  refineries,  and other physical assets,  and
access to the books,  records,  management and  executives of Purchaser,  to the
extent  Seller  believes  appropriate  for a due diligence  investigation  by an
prudent investor or underwriter acquiring or underwriting $400 million of common
stock.  Seller  will  execute  an  appropriate   confidentiality   agreement  in
connection  with such due  diligence.


     (b) Payments.  At Closing and thereafter  Purchaser  shall pay the Purchase
         --------
Price as  follows:

     (i)  Payments at the  Closing.  At the Closing  Purchaser  and Seller shall
          ------------------------
deliver irrevocable instructions to the Escrow Agent to deliver to Seller all of
the cash in the escrow (up to the Base  Purchase  Price)  and,  if the amount of
cash in the  Escrow  is less  than  the Base  Purchase  Price,  the  Shareholder
Agreement. In addition, Purchaser shall deliver the number of Shares then called
for under the  Shareholder  Agreement,  if any, at the Closing.  Purchaser shall
deliver the other  amounts due and owing in cash at the Closing by wire transfer
of  immediately  available  funds.  Inventory  payments  shall be  determined in
accordance with the provisions of Section 6. At the Closing,  Purchaser shall be
entitled to a credit, not to exceed $5 million, against the Purchase Price in an
amount equal to (A) 50 percent of the difference  between the interest earned by
Purchaser  on the funds in the Escrow and the interest  paid by  Purchaser  with
respect  thereto,  and  (B) 50  percent  of the  transaction  fees  incurred  by

                                       5
<PAGE>

Purchaser in obtaining the funds in the Escrow (other than the transaction  fees
incurred by Purchaser in respect to $600 million of debt that  Purchaser  issues
in a public  offering or in a private  offering  designed to allow resales under
Rule 144A, or if an irrevocable letter of credit is used in lieu of issuing such
$600 million of debt, the issuance fees for the letter of credit, which issuance
fees shall be for the  account of  Purchaser).


     (ii)  Payments  after  Closing.  Purchaser  shall  pay any  portion  of the
           ------------------------
Purchase  Price due after the Closing in accordance  with the provisions of this
Agreement or other  agreement  covering  such  payment.

     6.  Inventory.  At Closing and thereafter in accordance with the provisions
         ---------
of Attachment  IX,  Purchaser  shall pay as  consideration  for the Inventory an
amount  determined  in accordance  with the  provisions of Attachment IX by wire
transfer of immediately available funds.

     (7)   Assumption  of   Obligations;   Retained   Liabilities.
     ----------------------------------

     (a) Assumption of Obligations. Purchaser shall assume, and pay, perform and
     -----------------------------
discharge  when due,  any  liability  or  obligation  (i) with respect to the 76
Assets and the  Contracts  but only to the extent such  liability or  obligation
arises  out of or  relates to the  period  from and after the  Closing,  (ii) as
provided in the Environmental  Agreement, and (iii) with respect to deposits and
advances  from  customers  and dealers,  but only to the extent of the amount of
cash  transferred  to Purchaser  pursuant to Section 1(f) as dealer and customer
deposits.

     (b) Franchise and PMPA Obligations.
         ------------------------------

     (i) Except as otherwise  provided in section  7(b)(iv) below,  Seller shall
assign and Purchaser shall assume and discharge all existing franchise and other
agreements and  obligations of the Products  Company with its  franchisees as of
the Closing Date, including  obligations under the Petroleum Marketing Practices
Act,  as  amended,  15  U.S.C.  ss.ss.2801,  et seq.  ("PMPA"),  and  applicable
provisions of state law (Cal. Bus. & Prof. Code ss.ss.20999,  et seq.; Wash. St.
ss.ss.19.100.101,  et seq.; Ore. Rev. St. ss.ss.650.200,  et seq., and Ore. Rev.
St. ss.ss.44-01551,  et seq.; Nev. Rev. St. ss.ss.597.300, et seq.; Ha. Rev. St.
ss.ss.486H-I,  et seq.;  and Ak. Rev.  St.  ss.ss.45.50.800,  et  seq.).

     (ii) Seller has  determined,  in good faith and in the  ordinary  course of
business,  to withdraw from  marketing  motor fuel through retail outlets in the
states of California,  Washington,  Oregon, Nevada,  Arizona,  Alaska and Hawaii
("Withdrawal  Area") in accordance with the requirements of the PMPA. Within ten
days of the date of this Agreement, Seller will provide written notice to all of
its  PMPA  franchisees  in the  Withdrawal  Area of such  withdrawal  and of the
termination  and  non-renewal  of  their  franchise   agreements  and  franchise
relationship with Seller.  Seller shall also give all other notices required by,

                                       6
<PAGE>

and otherwise  comply with, PMPA and any state law not preempted by Federal law,
in connection with such withdrawal and such termination and non-renewal.  If the
franchise  agreement of any such franchisee  expires prior to the effective date
of such termination and non-renewal, Seller will extend the franchise agreement,
or offer the  franchisee an "interim  franchise"  in  accordance  with the PMPA,
until such effective  date. To the extent that it has the  contractual and legal
right to do so, Seller will also  terminate or non-renew any other  agreement it
has with the franchisee  which is related to the franchise,  effective as of the
effective date of termination or non-renewal of the franchise agreement.  Seller
will provide  Purchaser with a copy of the form of the notice of termination and
non-renewal, and a list of the franchisees to whom it was sent.

     (iii) Not less than  seventy-five  days  prior to the date set forth in the
notices of termination and non-renewal  referenced in section  7(b)(ii)  hereof,
Purchaser  shall:  (1) in accordance  with the provisions of the PMPA, 15 U.S.C.
ss.2802(b)(2)(E)(iii)(II),  offer, in good faith,  to each franchisee  leasing a
retail outlet from Seller a franchise agreement of at least three years duration
on terms  and  conditions  which are not  discriminatory  to the  franchisee  as
compared to franchises then currently being offered by Purchaser; and (2) offer,
in good  faith,  to  each  franchisee  (other  than  those  covered  by  Section
7(b)(iii)(1))  a branded supply  contract for motor fuel of at least three years
duration on terms and conditions which are not  discriminatory to the franchisee
as compared to franchises then currently  being offered by Purchaser.  Purchaser
agrees that these franchise agreements and branded supply contracts shall become
effective  no later than the date set forth in the  notices of  termination  and
non-renewal referenced in Section 7(b)(ii) hereof.

     (iv)  Liabilities  and  costs  associated  with  franchise   litigation  or
threatened claims against Seller arising out of events prior to closing (and not
covered by the next sentence of this clause (iv)) shall be the responsibility of
Seller, and Seller will defend,  indemnify and hold harmless Purchaser from such
litigation or claims.  Purchaser will defend, indemnify and hold harmless Seller
from all  franchise  or  related  claims  under  the PMPA or state law which are
brought against Seller by any person as the result of Seller's  participation in
the  transactions  contemplated  hereby,  including,  but not limited to, claims
based on future  intentional acts by Seller in violation of state statutes which
Purchaser and Seller contend are lawful acts because of preemption by the PMPA.

     (c) Retained  Liabilities.  The following liabilities and obligations shall
         ---------------------
be  the   responsibility   of  Seller  (the   "Retained   Liabilities"):

     (i) except as otherwise  provided  herein,  any  liability or obligation of
Seller or the  Subsidiaries,  including  without  limitation  any  liability  or
obligation  in  respect  of the 76  Assets,  whether  known,  unknown,  accrued,
absolute,  contingent or otherwise, which arises out of or relates to the period
prior to the Closing;

     (ii)  without  limiting  the  foregoing,   environmental   liabilities  and
obligations  in respect of the 76 Assets,  as and to the extent  provided in the
Environmental Agreement;


                                       7
<PAGE>

     (iii) except as otherwise  provided in Section 29 hereof,  any liability or
obligation for salary, wages, benefits, vacation,  severance, or overhead for or
on behalf of, or for any violations of law relating to the hiring, employment or
termination of employment (including,  without limitation, any violations of the
Employee  Retirement  Income Security Act ("ERISA"),  the Worker  Adjustment and
Retraining  Notification Act ("WARN"),  continuation coverage ("COBRA coverage")
requirements of Section 4980B of the Internal  Revenue Code of 1986, as amended,
or Part 6 of Title I of ERISA,  worker's  compensation  laws,  and any  federal,
state,  local or foreign  laws  relating  to plant  closings or  termination  of
employees)  of any current or former  employees  of Seller  pertaining  to their
employment  by Seller,  and any other  liability or  obligation  relating to any
employee or former employee of Seller pertaining to their employment by Seller;

     (iv) any Taxes or levies (1) based upon the gross or net income or receipts
of Seller or any of its  affiliates  or  otherwise in the nature of an income or
franchise Tax (as defined  below),  or (2) arising  during,  or relating to, any
period (or portion thereof) ended on or prior to the Closing;

     (v) any  liability or  obligation  arising out of or relating to any of the
Excluded Assets; and

     (vi) liabilities and costs allocated to Seller by Section 7(b)(iv).

     (8) Related Agreements. As provided below, Seller and Purchaser shall enter
     ----------------------
into the following agreements at the Closing in connection with the transactions
contemplated hereby:

     (a)  Intellectual  Property.  (i)  Seller  shall  cause to be  assigned  or
          ----------------------
licensed to  Purchaser  the  Intellectual  Property  pursuant to the terms of an
Intellectual  Property Agreement (the "Intellectual  Property Agreement") in the
form attached hereto as Attachment  XV;

     (ii) Seller  shall cause to be provided to  Purchaser  the Shared  Software
License Agreement on the terms set forth on Attachment XI.

     (iii) to the  extent  it is able,  Seller  shall  assign to  Purchaser  any
third-party  intellectual  property rights it has with respect to the 76 Assets.
Purchaser shall be responsible for any payments with respect thereto incurred on
or after Closing; and

     (iv) Seller shall assist Purchaser in obtaining, to the extent practicable,
at Purchaser's expense, any rights from independent  third-parties in respect of
the intellectual property not covered by Sections 8(a)(i), (ii) and (iii) above.

     (b) Services.  (i) Purchaser shall provide to Seller certain  services (the
         --------
"Purchaser  Services")  pursuant to one or more Purchaser Services Agreements in
the form to be reasonably agreed by the parties prior to Closing (the "Purchaser

                                       8
<PAGE>

Services Agreement(s)").<F1>

     (ii) Seller shall provide, or cause its affiliates to provide, to Purchaser
certain services (the "Seller Services") pursuant to one or more Seller Services
Agreements in the form to be  reasonably  agreed by the parties prior to Closing
(the "Seller Services Agreement(s)").<F2>

     9. Permits,  Contracts, Etc.. Seller shall assign to Purchaser all permits,
        --------------------------
contracts,   licenses,  leases  (including  office  leases)  and  other  similar
entitlements  and obligations  with respect thereto relating to the 76 Assets to
the extent  assignable by Seller;  provided,  however,  that if a non-assignable
permit, license, lease, contract or other entitlement is material and reasonably
necessary  for the  operation  of a facility,  the parties  shall  cooperate  to
provide to purchaser the benefits of such lease or contract by sublease or other
mechanism,  and,  if it is not  possible  to do so, the  purchase  price will be
adjusted if the lease or contract is material,  subject to the  limitations  set
forth in Section 21. The parties will  cooperate in good faith,  both before and
after Closing, to obtain any Consents required.

     (10) Closing.

     (a)  Date,  Time and  Place.  The sale and  purchase  of the  assets  to be
          -----------------------
conveyed  hereunder  shall occur at the Closing (the  "Closing"),  to be held at
Seller's executive offices at El Segundo,  California, or such other location as
Seller may designate, on the close of business,  February 28, 1997. Either party
may extend the Closing to a date as soon as  reasonably  practicable  thereafter
(but not later than May 30,  1997) if all closing  conditions  specified  herein
have not been  satisfied  or waived by  February  28,  1997.  As used herein the
"Closing Date" shall be the actual date of the Closing, and the Closing shall be
effective as of the close of business on such date.  Any  extensions  beyond May
30, 1997 shall be upon mutual agreement of the parties.

- ----------

<F1> Purchaser Services to inlcude any services provided by the Products Company
to other  operations  of Seller after the Closing Date,  and which  services are
reasonably  necessary for Seller to conduct such  operations as conducted on the
date of this  Agreement.  Purchaser  to  provide  such  services  to seller on a
commercially  reasonable  basis,  and shall not be  required to perform any such
services to the extent such performance would unreasonably interfere with the 76
Assets.

<F2> Seller Services to include any services provided to the 76 Assets by Seller
or any of its affiliates as of the date hereof which are reasonably necessary in
respect of the 76 Assets or to conduct the  operations of the Products  Company.
Seller to provide such services to Purchaser on a commercially reasonable basis.


                                       9
<PAGE>

     (b) Seller's  Obligations.  At the Closing,  Seller  shall  execute  and/or
deliver  (as the  case may be) to  Purchaser  (or,  in the case of (xii)  below,
Purchaser's title insurance companies) the  following:

          (i)  one or more grant deeds (or  equivalents  with covenants  against
               grantor's   acts)  (the   "Deed(s)")   conveying   Insurable  and
               marketable title to the Real Property and  Improvements  owned in
               fee to Purchaser,  subject only to the Permitted Exceptions, such
               Deed(s) being in recordable form for recording same in the county
               or  counties  in which the Real  Property  and  improvements  are
               located, and such other assignments and instruments of conveyance
               or transfer,  in forms reasonably  satisfactory to Purchaser,  as
               may be necessary  to vest in  Purchaser  the interest in the Real
               Property and the Improvements which are not owned in fee;

          (ii) a bill of sale in the form  reasonably  satisfactory to Purchaser
               ("Bill  of  Sale"),   stock  powers   conveying   the  shares  of
               Subsidiaries,  together  with the  certificates  evidencing  such
               shares,  an  Assignment  and  Assumption of Contracts in the form
               reasonably    satisfactory   to   Purchaser    ("Assignment   and
               Assumption"), and such other bills of sale, assignments and other
               instruments  of  conveyance  and  transfer,  in forms  reasonably
               satisfactory to Purchaser,  as are necessary to vest in Purchaser
               title in and to the Inventory,  Equipment and  Contracts.  Seller
               shall (or where  appropriate shall cause a subsidiary to) take or
               cause  to be  taken  such  other  steps  as are  required  to put
               Purchaser in actual  possession  and operating  control of the 76
               Assets and the operations of the Products Company;

          (iii) the Intellectual Property Agreement;

          (iv) the Shared Software License Agreement;

          (v) the Seller Services Agreement(s);

          (vi) the Purchaser Services Agreement(s);

          (vii) the Environmental Agreement;

          (viii) the Participation Payment Agreement;

          (ix) the following certificates:

                                       10
<PAGE>

               (1)  a  certificate  substantially  to  the  effect  of  Sections
                    11(a)(i),  (ii) and (iii),  dated as of the Closing Date and
                    executed by a duly authorized officer of Seller;

               (2)  a certificate  certifying  the  incumbency of any officer of
                    Seller   executing   this   Agreement,   or  any  agreement,
                    instrument or certificate  delivered by Seller in connection
                    herewith,  dated as of the  Closing  Date and  executed by a
                    duly authorized officer of Seller;

               (3)  a  certificate  to the effect that,  as of the Closing Date,
                    Seller is not a foreign  person as defined  in the  Internal
                    Revenue   Code  of  1986,   as   amended,   and  Income  Tax
                    Regulations,  such  certificate to be  substantially  in the
                    form    described    in    Treasury    Regulation    Section
                    1.1445-2(b)(2)(iii)(B) or otherwise with the requirements of
                    Section  1.1445-2(b)(2) of that regulation,  dated as of the
                    Closing  Date and  signed by a duly  authorized  officer  of
                    Seller;

          (x) the opinion of counsel of Seller described in Section 18 below;

          (xi) any and all  other  documents,  instruments  and/or  certificates
               reasonably  requested by Purchaser or otherwise  contemplated  by
               this Agreement;

          (xii)an  owner's  affidavit  and  such  corporate   certificates  with
               respect to good standing,  incumbency,  franchise  Taxes, and the
               authorization  of the sale of the Real Property and  Improvements
               as title insurance  companies may reasonably  request in order to
               omit  requirements,  exceptions  and/or add affirmative  coverage
               endorsements  from or to the coverage of the fee  policies  being
               delivered at Closing with respect to all encumbrances,  liens and
               other matters affecting the Real Property and Improvements  other
               than the Permitted Exceptions; and

          (xiii) such documents necessary to effect the transfer of the Vessels,
               as required by U.S. Coast Guard regulations.

     (c) Purchaser's Obligations. At the Closing, Purchaser shall execute and/or
         -----------------------
deliver (as the case may be) to Seller the following:Purchaser's Obligations. At
the Closing,  Purchaser  shall  execute  and/or  deliver (as the case may be) to
Seller the following:

          (i)  the  amounts  payable  at the  Closing  in  respect  of the  Base
               Purchase  Price,  the  Inventory  and the  outstanding  principal
               balance of Self-  Amortizing  Notes issued after the date hereof,
               as set forth above;

                                       11
<PAGE>

          (ii)    the Intellectual Property Agreement;

          (iii)   the Shared Software License Agreement;

          (iv)    the Seller Services Agreement(s);

          (v)     the  Purchaser  Services  Agreement(s); 

          (vi)    the  Environmental Agreement;

          (vii)   the Participation Payment Agreement;

          (viii)  the following certificates:

               (1)  a  certificate  substantially  to  the  effect  of  Sections
                    11(b)(i),  (ii) and (iii),  dated as of the Closing Date and
                    executed by a duly authorized officer of Purchaser;

               (2)  a certificate  certifying  the  incumbency of any officer of
                    Purchaser  executing  this  Agreement,   or  any  agreement,
                    instrument   or   certificate   executed  by   Purchaser  in
                    connection  herewith,  dated  as of  the  Closing  Date  and
                    executed by a duly authorized officer of Purchaser;

          (ix)      the opinion of counsel of Purchaser  described in Section 18
                    below; and

          (x)       any and all other documents, instruments and/or certificates
                    reasonably requested by Seller or otherwise  contemplated by
                    this Agreement.

     11.  Conditions  Precedent  to Closing.  Subject to the terms  hereof,  the
          ---------------------------------
obligations  of  Seller  and  Purchaser  at  the  Closing  are  subject  to  the
satisfaction  or waiver  at or prior to the  Closing  of each of the  respective
conditions set forth below.

     (a)   Conditions   to   Purchaser's   Obligations.   The   obligations   of
           -------------------------------------------  Purchaser at the Closing
are subject to the following conditions:

     (i) subject to Section 21, all  representations  and  warranties  of Seller
contained  in  this  Agreement  and any  agreement,  instrument  or  certificate
delivered  by Seller  pursuant  hereto shall be true and correct in all material
respects, except to the extent waived by Purchaser;

     (ii) Seller shall have performed all covenants  required by this Agreement,
or by any  agreement,  instrument or  certificate  delivered by Seller  pursuant
hereto, to be performed by it at or prior to the Closing;

                                       12
<PAGE>

     (iii) Seller shall have delivered to Purchaser all agreements, instruments,
certificates  and documents  required to be so delivered under this Agreement or
such other agreements or instruments,  including without limitation those listed
in Section 10(b);

     (iv) any  applicable  waiting  periods  or  extensions  thereof  under  the
Hart-Scott-Rodino  Antitrust  Improvements  Act of 1976, as amended,  shall have
expired;

     (v)  no  injunction  or  order  shall  have  been  issued   restraining  or
prohibiting, nor shall there be any law or decision which would render Purchaser
unable  to  consummate,  or  which  would  bar or  substantially  delay  (1) any
transaction  contemplated by this Agreement, or (2) Purchaser's ownership or use
of the 76  Assets;  nor shall any  governmental  agency  have filed an action or
threatened to file an action seeking any of the foregoing;

     (vi) the following specific conditions shall have been satisfied:

                    (1)  the  Improvements  and the  Equipment  shall be in such
                         working  condition  that  Purchaser  will  be  able  to
                         operate the refineries included in the 76 Assets at the
                         capacities set forth in Attachment XVIII, in compliance
                         in all material  respects with all applicable  laws and
                         Permits;

                    (2)  Purchaser  shall have  obtained  or have the benefit of
                         all  material  Permits and Consents  necessary  for the
                         normal operation of the 76 Assets by Purchaser;

                    (3)  subject  to  Section  21,   Purchaser's  due  diligence
                         investigation  in  respect  of the  condition  and  the
                         operations  of the 76 Assets  shall not have  disclosed
                         material adverse matters as to the 76 Assets,  taken as
                         a whole, not heretofore  known by Purchaser.  Purchaser
                         agrees  that it will  undertake  and  complete  its due
                         diligence on the  capacities of the major process units
                         at the refineries by January 15, 1997, on the Condition
                         of the  refineries by February 7, 1997 and on all other
                         matters by February 25, 1997,  and notify Seller of its
                         findings  by such dates.  Failure to complete  such due
                         diligence  and so  notify  Seller by such  dates  shall
                         constitute a waiver of the  condition set forth in this
                         Section  11(a)(vi)(3)  (but not any other  provision of
                         this Agreement); and

     (vii) as of the Closing,  Purchaser  shall have  obtained all rights to all
Intellectual  Property  necessary  to  operate  the 76  Assets  or  conduct  the
operations of the Products Company.

                                       13
<PAGE>

     (b) Conditions to Seller's  Obligations.  The  obligations of Seller at the
         -----------------------------------
Closing  are  subject  to  the  following   conditions:

     (i) all  representations  and  warranties  of  Purchaser  contained in this
Agreement and any agreement or instrument delivered by Purchaser pursuant hereto
shall be true and correct in all material respects,  except to the extent waived
in writing by Seller;

     (ii)  Purchaser  shall  have  performed  all  covenants  required  by  this
Agreement, or by any agreement, instrument or certificate delivered by Purchaser
pursuant hereto, to be performed by it at or prior to the Closing;

     (iii) Purchaser shall have delivered to Seller all agreements, instruments,
certificates  and documents  required to be so delivered under this Agreement or
such other agreements or instruments,  including without limitation those listed
in Section 10(c);

     (iv) any  applicable  waiting  periods  or  extensions  thereof  under  the
Hart-Scott-Rodino  Antitrust  Improvements  Act of 1976, as amended,  shall have
expired;

     (v)  no  injunction  or  order  shall  have  been  issued   restraining  or
prohibiting,  nor shall there be any law or decision  which would render  Seller
unable to consummate, or which would bar or substantially delay, any transaction
contemplated by this Agreement;  nor shall any governmental agency have filed an
action or threatened to file an action seeking any of the foregoing;

     (vi) all governmental approval, decision or permit required to complete the
transactions contemplated by this Agreement shall have been obtained; and

     (vii) If Seller is entitled to receive  Shares under the Escrow  Agreement,
there  shall not have  occurred  a  material  adverse  change  in the  financial
condition  of  Purchaser  after the date of its most recent  publicly  available
financial  statements,  and Purchaser's  independent  accountants shall not have
qualified their opinion to Purchaser's audited financial  statements on a "scope
of audit" or "going concern" basis.

     12.  Cooperation.  From the date  hereof  until  the  Closing,  Seller  and
          -----------
Purchaser  shall work  together in the spirit of continuing  cooperation  to (a)
cause the  conditions  to Closing  set forth in Section  11 to be  satisfied  as
quickly as is reasonably possible, and (b) obtain any Consent (as defined below)
required by Seller or Purchaser to consummate the  transaction  contemplated  by
this Agreement,  or otherwise in connection with Purchaser's ownership of the 76
Assets or  its proposed business operations.

                                       14
<PAGE>

     13. Seller's  Representations and Warranties.  In order to induce Purchaser
         -----------------------------------------
to enter into this Agreement,  Seller,  for itself and the Subsidiaries,  hereby
warrants and represents to Purchaser that:

     (a)  Organization.  (i) Seller is a  corporation  duly  organized,  validly
          -------------
existing and in good standing  under the laws of the State of California and has
the corporate power and authority to own, lease and operate the 76 Assets and to
conduct its business  operations.

     (ii) To Seller's  knowledge,  each of the Subsidiaries listed in Attachment
VIII is duly organized,  validly existing and in good standing under the laws of
the  state of its  respective  organization,  and has the  corporate  power  and
authority to own its assets and conduct its  operations.  Seller owns the equity
interests in the  Subsidiaries  set forth in Attachment VIII subject to no lien,
encumbrance or option in favor of any third party.

     (b) Authority; Enforceability. Seller has the corporate power and authority
         --------------------------
(i) to execute and deliver this  Agreement  and each  agreement  and  instrument
delivered  or to be delivered by Seller  pursuant  hereto,  and to carry out its
obligations hereunder and thereunder and (ii) to own or lease and operate the 76
Assets and to conduct its business.  The execution,  delivery and performance of
this Agreement and each  agreement and  instrument  delivered or to be delivered
pursuant hereto by Seller, and the consummation of the transactions provided for
hereby and thereby,  have been duly  authorized  and  approved by all  requisite
corporate  action of Seller and no other corporate act or proceeding on the part
of Seller or its  affiliates  or  shareholders  is necessary  to  authorize  the
execution, delivery or performance of this Agreement or of such other agreements
and instruments, or the transactions contemplated hereby or thereby; and each of
this Agreement and such agreements and instruments is, or upon its execution and
delivery  will be,  legal,  valid,  binding and  enforceable  against  Seller in
accordance with its respective  terms.  Neither Seller nor any of its affiliates
has any contractual obligation,  to sell, lease or otherwise transfer,  directly
or  indirectly,  the 76 Assets or any part  thereof  to any  person  other  than
Purchaser or as permitted by Section  27.

     (c) Permits and  Consents.  To Seller's  knowledge,  Attachment  XX and the
         ----------------------
schedules to  Attachment  XXII hereto set forth an accurate and complete list of
all permits,  licenses,  approvals and  authorizations  required  under federal,
state, local and foreign laws, rules, regulations,  orders, licenses, decrees or
judgments  necessary  for the  operation  of the Products  Company  ("Permits").
Except  as set forth on  Attachment  XX and the  schedules  to  Attachment  XXII
hereto,  to Seller's  knowledge  no consent,  waiver,  approval,  authorization,
exemption,  registration, license or declaration ("Consent") of or by, or filing
with,  any  other  person  is  required  with  respect  to  Seller or any of its
affiliates in connection with the execution,  delivery or enforceability of this
Agreement or any agreement or instrument  delivered  pursuant  hereto by Seller,
and or the  consummation  of any of the  transactions  provided  for  hereby  or
thereby,  other than (i) those for which any adverse consequences arising out of
the failure to obtain such  Consent or to make such filing are not  significant,

                                       15
<PAGE>

individually and in the aggregate, to the 76 Assets and/or the operations of the
Products Company,  and (ii) filings made under the  Hart-Scott-Rodino  Antitrust
Improvements  Act  of  1976,  as  amended.


     (d) No Breach.  Except as set forth on Schedule  13(d),  the  execution and
         ----------
delivery of this Agreement and each agreement and instrument  delivered or to be
delivered  pursuant hereto by Seller,  and the  consummation of the transactions
provided  for hereby and  thereby and the  compliance  by Seller with any of the
provisions  hereof or thereof  does not and will not (i)  violate,  or  conflict
with, or result in a breach of, any  provisions  of, or constitute a default (or
an event  which,  with  notice  or lapse of time or  both,  would  constitute  a
default)  under,  or result in the termination of, or accelerate the performance
required  by,  or  result  in the  creation  of any  lien  upon  any of the Real
Property, Improvements,  Inventory, Equipment, Pipelines,  Intellectual Property
or Contracts under,  any of the terms,  conditions or provisions of the Articles
of  Incorporation  or  Bylaws  of Seller or  similar  charter  documents  of any
Subsidiary or under any Material Contract (as defined in Section 13(k)) or other
agreement,  instrument or obligation to which Seller is a party, or by which the
facility or any of the operations of the Products Company is otherwise bound, or
(ii)  violate  any order,  injunction,  statute,  rule or  regulation,  or (iii)
trigger  any rights of first  refusal,  or any  buy/sell  or  similar  rights.

     (e) Real  Property.  Attachment  II sets forth the  address of each item of
         ---------------
Real Property and the nature and extent of Seller's  ownership interest therein.
Seller has Insurable and marketable title in fee simple to the Real Property and
Improvements indicated thereon as owned in fee, which at Closing will be subject
only to the Permitted Exceptions,  and the Deed(s) thereto will be in recordable
form  with  respect  to all of  such  Real  Property  and  Improvements  therein
described.  With  respect to any Real  Property or  Improvements  which is under
lease to Seller,  such Attachment  identifies the address,  the landlord and the
date and terms of the lease;  and, except as indicated in such  Attachment,  all
such  leases are valid and are in full force and effect and are  enforceable  in
accordance  with their terms, no material  defaults exist with respect  thereto,
are Insurable  leasehold  interests,  and all such leases may be assigned and/or
sublet to Purchaser  without the consent of the lessor  thereunder  or any third
party.  With  respect to any other  interest  in real  property  included in the
Products  Company,  such  Attachment  sets  forth a  description  of  such  Real
Property,  its  owner,  and the  terms  and  conditions  of use.  To the best of
Seller's  knowledge,  other than as listed in Attachment  II or Attachment  III,
there are no material easements, covenants, restrictions, rights-of-way or other
interests or rights  reasonably  necessary  for the  operations  of the Products
Company.  The easements,  rights-of-way and other interests and rights described
in  such  Attachment  are  valid  and  are in  full  force  and  effect  and are
enforceable  in  accordance  with their terms,  and may be assigned or otherwise
transferred to Purchaser without the Consent of any third party, except as noted
in said Attachment.

     (f) Pipelines.  Attachment III sets forth a list of the pipelines which are
         ---------
included  in the 76 Assets.  To the best of  Seller's  knowledge,  other than as
listed in Attachment  III and other than  Permitted  Exceptions,  Seller has all



                                       16
<PAGE>

material easements, covenants, restrictions, rights-of-way or other interests or
rights that are  reasonably  necessary  for the  operation  of the  Pipelines as
conducted by Seller in 1996.  Except as set forth on Attachment III, Seller has,
and as of the Closing  Purchaser will have, title to the equipment  constituting
the Pipelines free and clear of all liens and encumbrances  other than Permitted
Exceptions.

     (g) Capital Projects. Attachment XXI identifies and describes in reasonable
         -----------------
detail all major capital  projects pending or planned at or in respect of the 76
Assets in calendar year 1997,  including the estimated final completion date and
estimated  final cost  thereof.

     (h)  Equipment.  Attachment  IV  identifies  each major  item of  equipment
          ---------
relating to the 76 Assets,  including  a general  description  of related  spare
parts,  and provides a summary  description  of each material item thereof,  and
except  as  indicated  in  Attachment  IV,  Seller  has,  and as of the  Closing
Purchaser will have,  title to such  Equipment,  free and clear of all liens and
encumbrances.

     (i) Refineries Capacities;  Condition.  The capacities of the refineries of
         ----------------------------------
the Products Company are set forth in Attachment  XVIII. The condition of the 76
Assets, taken as a whole, is generally consistent with their respective ages and
stages of useful  life  (repair  cycle).

     (j)  Compliance  with Laws. To Seller's  knowledge,  except as set forth on
          ----------------------
Schedule  13(j),  Seller  and each of its  affiliates  is in  compliance  in all
material respects with all Permits, judgments,  orders,  injunctions,  statutes,
rules,  regulations and other legal requirements (other than Environmental Laws)
applicable  to, or required in connection  with, the 76 Assets or the operations
of the Products  Company.  Except as set forth in said Schedule,  Seller has not
received  (whether  directly or indirectly) since January 1, 1996, any notice of
material violation of any such Permit,  judgment,  order,  injunction,  statute,
rule,  regulation or other legal  requirement.

     (k) Contracts. (i) Attachment VII contains an accurate and complete list of
         ----------
all Material Contracts of the Products Company, including without limitation any
Material  Contracts  relating  to any of the 76 Assets or by which the 76 Assets
are  bound.

     (ii) Except as  specifically  disclosed in  Attachment  VII, (1) all of the
Material  Contracts  are  valid  and  are in  full  force  and  effect  and  are
enforceable  in  accordance  with their  terms,  (2) to Seller's  knowledge,  no
material defaults exist with respect thereto,  nor has any event occurred which,
with the lapse of time or the  giving of notice,  or both,  would  constitute  a
default under any Material Contract, except where neither such a default nor the
loss of such Contract would have a material adverse effect upon the 76 Assets or
any of the operations of the Products Company,  (3) all such Material  Contracts
may be assigned to Purchaser  without the Consent of any third party, and (4) to

                                       17
<PAGE>

the best of Seller's knowledge,  there exists no material dispute with any other
party with respect to any such Material Contract.

     (iii) As used herein,  "Material  Contract" means a Contract which involves
the  purchase,  sale or lease of goods,  services or property  for $1 million or
more and is not terminable without penalty prior to June 30, 1997.

     (1)  Intellectual  Property.  (i) To Seller's  knowledge,  the schedules to
          ----------------------
Attachment XV contain an accurate and complete list of all Intellectual Property
owned by Seller and its  affiliates  which is used in, and is  material  to, the
business  of  Products  Company.  To  Seller's  knowledge,  without  independent
investigation, (A) such Intellectual Property does not infringe upon any patent,
trademark or service mark,  or  misappropriate  any trade  secret,  of any third
party (and,  except as disclosed on Schedule  13(l),  Seller is not aware of any
assertions   made  by  any  third  party  alleging  such  an   infringement   or
misappropriation),  and (B) Seller's right to use such Intellectual  Property is
valid  and  such   Intellectual   Property  is  not  being   infringed  upon  or
misappropriated  by any third party.  Except as disclosed on Schedule  13(l), to
Seller's  knowledge,  Seller and its  affiliates  have the right to assign their
respective right,  title and interest in and to, or to license the right to use,
the  Intellectual  Property to  Purchaser  in  accordance  with the terms of the
Intellectual   Property   Agreement.

     (ii) To Seller's knowledge, without independent investigation, with respect
to any intellectual  property owned by a third party and licensed or sublicensed
to Seller or its  affiliates  under a Contract set forth on Attachment  VII, (A)
such Contract grants to Seller or its affiliate, as licensee or sublicensee,  as
the case may be, the right to use such intellectual  property as it is currently
being  used in  connection  with the  business  of  Products  Company,  (B) such
Contract is valid,  binding,  in full force and effect and  enforceable  against
such third party licensor or sublicensor in accordance  with its terms,  and (C)
such  intellectual  property  is  valid  and  is not  being  infringed  upon  or
misappropriated  by Seller or its  affiliates.  Except as  disclosed on Schedule
13(l),  to Seller's  knowledge,  all such Contracts  (relating to the license or
sublicense  of  intellectual  property  from a  third  party  to  Seller  or its
affiliates)  may be assigned or sublicensed to Purchaser  without the consent of
any third party.

     (m) Actions  and  Proceedings.  (i) Except as set forth on Schedule  13(m),
         -------------------------
there  is no  action,  suit,  proceeding  or  claim  pending,  or,  to  Seller's
knowledge,  threatened  against Seller or any of its affiliates,  whether or not
the defense  thereof or liability  in respect  thereof is covered by policies of
insurance,  involving  or  affecting  the 76  Assets  or the  operations  of the
Products Company and seeking (A) compensation in an amount in excess of $250,000
in each case, or $1,000,000 in the aggregate, (B) compensation in an unspecified
amount,  (C) relief or redress under  Environmental  Laws; or (D) any injunctive
relief,  except for such injunctive  relief that if granted would be immaterial,
individually and in the aggregate, to the 76 Assets and/or the operations of the
Products  Company,  nor is there any basis known to Seller for any such  action,
suit,  proceeding  or claim;  and there are no  decrees,  injunctions,  liens or
                                       18
<PAGE>

orders of any court or  governmental  department or agency  outstanding  against
Seller  relating to or affecting the 76 Assets or the operations of the Products
Company.

     (ii) To  Seller's  knowledge,  except as set forth on  Schedule  13(m),  no
action,  suit,  proceeding or claim is pending or threatened seeking to restrain
or  prohibit  this  Agreement,  or  any  agreement,  instrument  or  transaction
contemplated  hereby, or to obtain damages, a discovery order or other relief in
connection with this Agreement or any such agreement, instrument, or transaction
contemplated hereby.

     (n)  Employee  Relations.  Except as set  forth on  Schedule  13(n),  since
          -------------------                                                   
January 1, 1996 there has not occurred,  or to Seller's knowledge been seriously
threatened, any strikes,  slowdowns,  picketing, work stoppages or other similar
labor  activities  with  respect to  employees  employed  at the 76 Assets or in
connection with Seller's business operations thereat. 

     (o) Ordinary  Course.  Since  October 1, 1996,  except as permitted by this
         ----------------                                                       
Agreement, the 76 Assets have been used, operated and held by Seller only in the
ordinary course of  business.

     (9) Brokers.  All negotiations  relating to this Agreement,  the agreements
         -------                                                                
and instruments  delivered  pursuant hereto,  and the transactions  contemplated
hereby and thereby have been carried on without the  intervention  of any person
acting on behalf of Seller or its affiliates  (other than Goldman,  Sachs & Co.)
in such  manner as to give rise to any valid  claim  against  Purchaser  for any
broker's  or  finder's  fee or  similar  compensation  in  connection  with  the
transactions  contemplated  hereby  or  thereby.  Seller  agrees  to pay  and to
indemnify fully,  hold harmless and defend Purchaser and its affiliates from and
against,  and pay,  any  claims by  Goldman,  Sachs & Co.  or any  other  person
alleging a right to a broker's or finder's  fee based upon any actions of Seller
or its  affiliates.

     (q) Solvency.  Seller is solvent, is not in the hands of a receiver, nor is
         ---------
any  application of  receivership  pending and no proceedings  are pending by or
against  it  for   bankruptcy  or   reorganization   in  any  state  or  federal
court.

     (r)  Disclosure.  No  representation  or  warranty  made by  Seller in this
          ----------
Agreement  or in  any  agreement,  instrument  or  schedule  required  hereunder
contains any untrue  statement  of a material  fact or omits to state a material
fact necessary to make the statements  contained herein and therein not false or
misleading.

     (s)  Returns.  Seller has filed (or will cause to be filed) all  Non-Income
          --------
Tax  Returns (as  defined in Section  31(j)) that are  required to be filed with
respect to the 76 Assets or the Products  Company through the Closing Date, and,
to the best of Seller's knowledge,  such Returns are (and will be) true, correct
and  complete  in all  material  respects  and were  (and will be)  prepared  in
conformity  with all applicable  laws and  regulations  subject to Section 13(t)

                                       19
<PAGE>

below,  has paid (or will pay when due) all Taxes due on such  Returns  as owing
which are  attributable to any taxable period or portion thereof that ends on or
before the  Closing  Date.


     (t)  Financial  Statements.  Attachment  I contains  the audited  financial
          ---------------------
statements of the Products Company consisting of its consolidated  balance sheet
as of December 31, 1995 and  September  30, 1996,  and the related  consolidated
statements of operations, cash flows and parent company investment for the years
ending  December 31, 1994 and 1995 and for the nine months ended  September  30,
1996, and the report thereon of Coopers & Lybrand L.L.P. (the "Audited Financial
Statements").  The Audited  Financial  Statements  fairly  present the financial
condition and results of operations of the Products Company at the dates and for
the  periods  indicated  in  accordance  with  generally   accepted   accounting
principles ("GAAP") as described in the footnotes thereto.

     14. Purchaser's  Representations and Warranties.  In order to induce Seller
         --------------------------------------------
to enter into this Agreement, Purchaser hereby warrants and represents to Seller
that:

     (a)  Organization.  Purchaser  is a  corporation  duly  organized,  validly
          -------------
existing   and  in   good   standing   under   the   laws   of  the   State   of
Nevada.

     (b)  Authority;  Enforceability.  Purchaser  has the  corporate  power  and
          ---------------------------
authority  (i) to execute and deliver  this  Agreement  and each  agreement  and
instrument  delivered or to be delivered by Purchaser  pursuant  hereto,  and to
carry out its obligations  hereunder and thereunder and (ii) to own or lease and
operate the 76 Assets and to conduct its business.  The execution,  delivery and
performance of this Agreement and each agreement and instrument  delivered or to
be  delivered  pursuant  hereto  by  Purchaser,  and  the  consummation  of  the
transactions  provided for hereby and  thereby,  have been duly  authorized  and
approved by all requisite  corporate  action of Purchaser and no other corporate
act or proceeding on the part of Purchaser or its affiliates or  shareholders is
necessary to authorize the execution,  delivery or performance of this Agreement
or of such other agreements and instruments, or of the transactions contemplated
hereby  or  thereby;  and  each  of  this  Agreement  and  such  agreements  and
instruments  is, or upon its  execution  and  delivery  will be,  legal,  valid,
binding and  enforceable  against  Purchaser in accordance  with its  respective
terms. 

     (c)  Consents.  Except  as set  forth on  Schedule  14(c),  to  Purchaser's
          ---------
knowledge,  no Consent of or by, or filing  with,  any other  person is required
with  respect to  Purchaser  or any of its  affiliates  in  connection  with the
execution,  delivery or  enforceability  of this  Agreement or any  agreement or
instrument  delivered or to be delivered or to be delivered  pursuant  hereto by
Purchaser, or the consummation of any of the transactions provided for hereby or
thereby,  other than (i) those for which any adverse consequences arising out of
the  failure  to obtain  such  Consent or to make such  filing  are  immaterial,
individually and in the aggregate, to the 76 Assets and/or the operations of the
Products  Company,  (ii)  filings  made  under the  Hart-Scott-Rodino  Antitrust
Improvements  Act of  1976,  as  amended,  and  (iii)  approval  of  Purchaser's

                                       20
<PAGE>

shareholders  for the  issuance of any shares of  Purchaser  pursuant to Section
5(a).

     (d) No Breach.  Except as set forth on Schedule  14(d),  the  execution and
        -----------
delivery of this agreement and each agreement and instrument  delivered or to be
delivered pursuant hereto by Purchaser, and the consummation of the transactions
provided for hereby and thereby and the  compliance by Purchaser with any of the
provisions  hereof or thereof  does not and will not (i)  violate,  or  conflict
with, or result in a breach of any provisions of, or constitute a default (or an
event which,  with notice or lapse of time or both,  would constitute a default)
under, or result in the  termination of, or accelerate the performance  required
under,  any of the  terms,  conditions  or  provisions  of  the  Certificate  of
Incorporation  or By-laws of Purchaser  or (ii)  violate any order,  injunction,
statute,  rule or regulation,  or (iii) trigger any rights of first refusal,  or
any buy/sell or similar rights.

     (e) Actions and Proceedings.  To Purchaser's knowledge, except as set forth
         -----------------------
on Schedule 14(e), no action, suit, proceeding or claim is pending or threatened
seeking to restrain or prohibit this Agreement, or any agreement,  instrument or
transaction  contemplated  hereby,  or to obtain  damages,  a discovery order or
other  relief  in  connection   with  this  Agreement  or  any  such  agreement,
instrument,  or transaction  contemplated  hereby.

     (f) Brokers.  All negotiations  relating to this Agreement,  the agreements
         -------
and instruments  delivered  pursuant hereto,  and the transactions  contemplated
hereby and thereby have been carried on without the  intervention  of any person
acting on behalf of Purchaser or its  affiliates  in such manner as to give rise
to any valid claim  against  Seller for any  broker's or finder's fee or similar
compensation in connection with the transactions contemplated hereby or thereby.
Purchaser agrees to pay and to indemnify fully,  hold harmless and defend Seller
and its affiliates from and against,  and pay, any claims by any person alleging
a right to a broker's or finder's fee based upon any actions of Purchaser or its
affiliates.

     (g) Solvency.  Purchaser is solvent, is not in the hands of a receiver, nor
         --------
is any application of receivership  pending and no proceedings are pending by or
against it for  bankruptcy  or  reorganization  in any state or  federal  court.

     (h)  Disclosure.  No  representation  or warranty made by Purchaser in this
          ----------
Agreement or in any agreement or instrument delivered pursuant hereto, or in any
schedule,  written  statement or  certificate  furnished to Seller in connection
herewith or therewith, contains any untrue statement of a material fact or omits
to state a material fact necessary to make the statements  contained  herein and
therein not false or  misleading.

     15.  Environmental  Agreement.  Seller and  Purchaser  shall enter into the
          ------------------------
Environmental  Agreement  in the form of  Attachment  XXII  (the  "Environmental
Agreement")  at Closing.  The parties  intend that the  Environmental  Agreement
shall be the sole and exclusive  statement of the  representations,  warranties,
covenants, agreements and indemnities with respect to Environmental Laws and the

                                       21
<PAGE>

Release of Hazardous Substances (as defined in the Environmental Agreement).

     16. Condition of Assets.
         --------------------

         EXCEPT AS OTHERWISE SET FORTH HEREIN: ALL EQUIPMENT AND IMPROVEMENTS TO
BE CONVEYED  HEREUNDER WILL BE CONVEYED ON AN "AS IS," "WHERE IS," AND "WITH ALL
FAULTS"  BASIS AT THE  CLOSING;  AND  SELLER  MAKES NO  WARRANTIES,  EXPRESS  OR
IMPLIED,  CONCERNING  THE  PHYSICAL  CONDITION,  UTILITY OR  OPERABILITY  OF THE
EQUIPMENT OR IMPROVEMENTS (OTHER THAN SELLER'S  INVENTORY),  INCLUDING,  BUT NOT
LIMITED TO, ANY  WARRANTY OF  MERCHANTABILITY  OR OF FITNESS FOR  PARTICULAR  OR
ORDINARY USES OR PURPOSES.

     17. Objections to Title; Title Insurance. (a) Purchaser may, after the date
         ------------------------------------
hereof, (A) order an examination of title to the Real Property,  and (B) procure
property  searches with respect to the  Improvements,  Inventory,  Pipelines and
Equipment,  and (i) at Purchaser's  sole option,  order an as-built  survey (the
"Survey") from a reputable  surveying  firm,  complying  with current  ALTA/ACSM
standards,  showing the Real  Property,  the material  Improvements,  easements,
licenses,  rights-of-way and any other material recorded or unrecorded  interest
in respect of the Real Property, reasonably acceptable to Purchaser. The cost of
any  examination or search by Purchaser  hereunder and title  insurance shall be
paid by Purchaser.  Seller shall  cooperate  with  Purchaser and its  authorized
representatives  in respect of any examination,  search or survey hereunder and,
to the extent  available,  deliver to  Purchaser  all existing  title  insurance
reports,  copies of deeds,  Tax bills and surveys relating to the Real Property,
the Improvements and the Pipelines.

     (b) If (i) any material  defect appears in such report or search,  which is
not a  Permitted  Exception  or any survey  reveals  (ii) (A) any state of facts
which is  materially  adverse to  Purchaser's  use of the Real  Property  or the
Pipelines, access to all public roads, waterways, loading facilities, utilities,
pipelines and other  services and  improvements  necessary to, or otherwise used
for the benefit of, the 76 Assets, (B) any encroachments onto the Real Property,
projections off of the Real Property by the Improvements,  or encroachments onto
the Real Property by structures not intended to be conveyed to Purchaser hereby,
or  the  violation  of  applicable  zoning  or  set  back  requirements  of  the
Improvements,  (C) any  encroachment  onto any easements or rights-of-way by the
Improvements,   including  encroachments  onto  otherwise  acceptable  Permitted
Exceptions,  or (D) any gaps,  overlaps or easements  along the record lines and
the lots comprising the Real Property or on which the Pipelines are located,  or
within the  property  lines (each  matter  referred to in clause (i) or (ii),  a
"Reported  Encumbrance"),  Purchaser  shall give written notice of such Reported
Encumbrance to Seller within a period ending on the later of January 15, 1997 or
10 business  days after  receiving  the title  report,  Survey or other  written
notice  thereof (or any update or revision  thereto).  Seller shall have 30 days
following such notice in which to cure such Reported  Encumbrance to Purchaser's
reasonable  satisfaction,  and if the Reported  Encumbrance  is not cured within

                                       22
<PAGE>

such period, then the provisions of Section 21 shall be applicable thereto as if
it were an amendment to Seller's representations and warranties.

     (c) If Seller  cures any Reported  Encumbrance  to  Purchaser's  reasonable
satisfaction  pursuant hereto, or if Purchaser fails to notify Seller thereof in
accordance with Section 17(b), then such Reported  Encumbrance shall be deemed a
Permitted Exception for all purposes hereof.

     (d) Title  Insurance.  The title to the  portion of the Real  Property  and
Improvements  owned by Seller in fee or leased by Seller and that is conveyed to
Purchaser  hereunder  shall be insurable  (in the amount of the  Purchase  Price
allocated to such Real Property) at regular rates, subject only to the Permitted
Exceptions,  by nationally recognized title insurance companies authorized to do
business in the state where the Real Property is located acceptable to Purchaser
("Insurable")  pursuant to such coinsurance  and/or  reinsurance  title policies
which Purchaser reasonably deems appropriate, which shall be at Purchaser's cost
and  expense.  Any  such  reinsurance  title  policies,  as  referenced  in  the
immediately   preceding   sentence,   shall  contain  direct  access  provisions
reasonably acceptable to Purchaser.

     18. Opinions of Counsel.
         -------------------

     (a) Counsel for Seller.  Seller  shall  deliver to Purchaser at the Closing
         ------------------
the opinion of Dennis P.R.  Codon,  Esq., Vice President and General Counsel for
Seller, supplemented by opinions of designated counsel as appropriate, dated the
Closing Date and  substantially to the effect  that:

     (i) Seller is duly organized,  validly  existing and in good standing under
the laws of the State of California  and is duly  qualified and in good standing
in California and in other  jurisdictions  where the ownership of the 76 Assets,
or the conduct of the operations of the Products  Company,  requires it to be so
qualified;

     (ii)  Seller  has full  corporate  power and  authority  to enter into this
Agreement and each of the agreements specifically provided herein (together, the
"Seller's Agreements"), and to perform its obligations hereunder and thereunder;

     (iii) Each of the Seller's  Agreements  delivered pursuant hereto by Seller
has been duly executed and delivered by Seller;

     (iv) The  execution,  delivery  and  performance  by  Seller of each of the
Seller's Agreements by Seller will not result in any breach of Seller's Articles
of Incorporation or Bylaws;

     (v) Each of the Seller's Agreements is, and in combination are, or will be,
valid  agreements and  obligations of Seller and legally binding upon it, except

                                       23
<PAGE>

as  the  same  may  be  limited  by  or  subject  to   bankruptcy,   insolvency,
reorganization,  moratorium  or other  similar  laws now or  hereafter in effect
affecting  the  enforcement  of  creditors'   rights  generally  or  by  general
principles of equity;

     (vi) To such counsel's knowledge,  there is no action, suit,  proceeding or
claim  pending or  threatened  against or relating to Seller which is reasonably
likely to prevent  the  carrying  out of this  Agreement  or the  agreements  or
instruments  delivered pursuant hereto, or the transactions  contemplated hereby
or thereby,  declare any such transactions  unlawful, or cause such transactions
to be rescinded.

     (b) Counsel for Purchaser. Purchaser shall deliver to Seller at the Closing
         ---------------------
an opinion of Wilkes McClave III, Esq.,  counsel for Purchaser,  as supplemented
by opinions of  designated  counsel as  appropriate,  dated the Closing Date and
substantially to the effect that:

     (i)  Purchaser is duly  organized,  validly  existing and in good  standing
under the laws of the State of Nevada and has the corporate  power to own all of
its properties and assets and to carry on its business as conducted  immediately
prior to the Closing, and is duly qualified and in good standing in California;

     (ii)  Purchaser has full  corporate  power and authority to enter into this
Agreement  and each of the other  agreements  specifically  contemplated  hereby
(collectively,  the  "Purchaser's  Agreements"),  and to perform its obligations
hereunder and thereunder;

     (iii)  Each  of the  Purchaser's  Agreements  deliver  pursuant  hereto  by
Purchaser has been duly executed and delivered by Purchaser;

     (iv) The  execution,  delivery and  performance by Purchaser of each of the
Purchaser's Agreements will not result in any breach of Purchaser's  Certificate
of Incorporation or By-laws;

     (v) Each of the Purchaser's  Agreements is, and in combination are, or will
be, valid  agreements and  obligations of Purchaser and legally binding upon it,
except as the same may be  limited  by or  subject  to  bankruptcy,  insolvency,
reorganization,  moratorium  or other  similar  laws now or  hereafter in effect
affecting  the  enforcement  of  creditors'   rights  generally  or  by  general
principles of equity;

     (vi) To such counsel's knowledge,  there is no action, suit,  proceeding or
claim pending or threatened against or relating to Purchaser which is reasonably
likely to prevent  the  carrying  out of this  Agreement  or the  agreements  or
instruments  delivered pursuant hereto, or the transactions  contemplated hereby
or thereby,  declare any such transactions  unlawful, or cause such transactions
to be rescinded.

                                       24
<PAGE>

     19. Risk of Loss.  (a) If a Material  Loss Event (as defined  below)  shall
         ------------  
occur prior to Closing,  Seller shall immediately notify Purchaser and provide a
detailed report and the parties shall proceed as follows:

     (i) If it appears the damage can  reasonably  be  repaired  within 60 days,
Seller shall  immediately  commence  preparation  to effect such repairs and the
Closing shall be delayed  until the repairs are  completed;  provided,  however,
either party, in turn, may promptly notify the other that it wishes to close the
transaction  without  such  delay but with a  reduction  in the  Purchase  Price
reflecting  the  diminution  in value caused by the damage.  In such event,  the
parties  will  negotiate  in good  faith an  adjustment  to the  Purchase  Price
reflecting  the  diminution in value caused by the Material Loss Event.  If they
are unable to reach agreement, Seller shall complete the repairs in the required
time and the Closing shall be delayed until the repairs are completed.

     (ii) If it appears repairs can not reasonably be completed  within 60 days,
Seller shall  immediately  commence  preparation  to effect such repairs and the
parties shall  negotiate in good faith an  adjustment  to the Purchase  Price to
reflect the  diminution in value of the 76 Assets  caused by the damage.  Either
party  shall have the right to delay the date of  Closing  for up to 60 days (or
such shorter  time as is  necessary to remedy the loss).  If the parties are not
able to agree on a reasonable  price  adjustment  by the extended  Closing Date,
Purchaser may terminate the  transaction,  amounts in the escrow account will be
returned to Purchaser,  and both parties shall be released from the  transaction
with no penalty.

     (iii) In the event of  destruction,  damage,  or other  casualty  of the 76
Assets prior to Closing which does not  constitute a Material Loss Event,  or in
the event of a taking of less than a Material  portion thereof (in each case, as
defined below),  Seller shall promptly  notify  Purchaser and provide a detailed
report thereof. In such event,  Purchaser's  obligation to close hereunder shall
not be  affected,  but  Purchaser  and Seller  shall  negotiate  in good faith a
reduction in the Purchase Price to fairly reflect any diminution in value of the
76 Assets in excess of $5  million  per event  represented  by the  destruction,
damages,  or other casualty.  Seller may, in the alternative,  delay the Closing
for up to 90 days (or such  shorter time as is necessary to remedy the loss) and
rebuild, repair, replace or otherwise remedy the loss event, in which case there
shall be no reduction of the Purchase Price.

For purposes of this  Section 19 only,  a "Material  Loss Event" shall be damage
and probable loss caused by fire, explosion, earthquake, breakdown of equipment,
environmental  release that significantly  adversely affects the operations of a
major  facility,  or other  casualty to all or a portion of the 76 Assets,  or a
taking of a material portion of the 76 Assets (for Real Property,  more than 10%
of the  area  of the  Real  Property  is so  taken),  for  which  the  estimated
diminution  in value  (without  taking into account any insurance or third party
contributions)  is  reasonably  estimated  to be more than One  Hundred  Million
Dollars ($100,000,000 million).

                                       25
<PAGE>

     20. Termination; Remedies upon Default or Termination.
         -------------------------------------------------

     (a) Default by Seller.  Except as provided in Sections 20(c),  (d), (e) and
         -----------------  
(f) below, if Seller fails or refuses to close pursuant to this Agreement by the
appropriate  date of Closing as provided in Section 10 for any reason other than
Purchaser's material breach (including without limitation,  Purchaser's material
failure  to  cooperate  with  Seller  to  cause  the  closing  conditions  to be
satisfied),  Purchaser  shall be entitled to  reimbursement  for its  reasonable
out-of-pocket  costs paid in furtherance of this Agreement and the  transactions
contemplated hereby,  including reasonable  attorneys' fees, and its damages for
such breach  (subject to the  limitations of Section  23(d)).

     (b) Default by Purchaser. Except as provided in Section 20(f), if Purchaser
         --------------------
fails or refuses to close pursuant to this Agreement by the appropriate  date of
Closing as provided in Section 10 for any reason  other than  Seller's  material
breach  (including  without  limitation,  Seller's material failure to cooperate
with Purchaser to cause the closing conditions to be satisfied), Seller shall be
entitled  to  reimbursement  of  its  reasonable  out-of-pocket  costs  paid  in
furtherance of this Agreement and the transaction contemplated hereby, including
reasonable  attorneys'  fees,  and its damages  for such breach  (subject to the
limitations  of Section  23(d)).

     (c) Failure to Fund Escrow.  If Purchaser  fails to make the deposits  into
         -----------------------
the Escrow on January 15,  1997,  as required by Section 5,  Purchaser or Seller
may terminate  this  Agreement and Purchaser  shall pay $20 million to Seller by
wire transfer of  immediately  available  funds,  and that shall be the sole and
exclusive remedy of  Seller.

     (d) Failure to Obtain  Shareholder  Approval.  If  Purchaser  has failed to
         -----------------
deposit an amount in cash equal to the Base Purchase Price into the Escrow,  and
if the  Shareholders  of Purchaser fail to approve the issuance of the Shares by
February  28,  1997 (or March 14,  1997,  if the SEC reviews  Purchaser's  proxy
materials for its meeting of shareholders),  Seller may terminate this Agreement
and  Purchaser  will pay $20 million to Seller.  If Purchaser  has made deposits
into the Escrow,  Purchaser  and Seller  shall give  instructions  to the Escrow
Agent to  deliver  $20  million  to Seller  and the  remainder  of the Escrow to
Purchaser.  If  Purchaser  has not made any deposit  into the Escrow,  Purchaser
shall pay Seller by wire transfer of $20 million in immediately available funds.
Receipt  of $20  million  hereunder  by Seller  shall be the sole and  exclusive
remedy of Seller.

     (e) Purchaser Stock Price. If the Market Price is less than $45,  Purchaser
         ----------------------
may elect to issue  Shares in  accordance  with the  Shareholder  Agreement.  If
Purchaser  does not  elect to issue  sufficient  Shares in  accordance  with the
Shareholders  Agreement  such  that the  Market  Value is at least  equal to the
difference  between the Base Purchase  Price and the amount of cash deposited in
the  Escrow,  Seller  may elect to  terminate  this  Agreement  upon  payment to
Purchaser  of a  termination  fee of $20 million.  If Purchaser  elects to issue
sufficient  Shares in accordance  with the  Shareholder  Agreement such that the
Market Value is at least equal to the difference between the Base Purchase Price
and the amount of cash deposited in the Escrow, and if Seller determines in good

                                       26
<PAGE>

faith that there has been a material  adverse change in the financial  condition
of  Purchaser,  then Seller may elect to terminate  this  Agreement by paying to
Purchaser a termination  fee of $20 million.  Payment and receipt of $20 million
shall be the sole and exclusive remedy of both parties.

     (f) Other  Termination.  If Seller and Purchaser are unable to close by May
         ------------------
30, 1997  pursuant to the terms of this  Agreement  for any reason other than as
provided  above  despite  Purchaser's  and Seller's  mutual  cooperation  in all
material respects to cause the closing conditions to be satisfied,  if Purchaser
or Seller elects to terminate the Agreement pursuant to Section 21, or if Seller
and Purchaser  otherwise agree in writing to terminate this Agreement before the
Closing, this Agreement shall terminate and that shall be the sole and exclusive
remedy of both parties.

     21.  Updating of  Representations  and  Warranties;  Adjustment of Purchase
          ----------------------------------------------------------------------
Price. Each party may amend the schedules or disclosure  Attachments referred to
in its representations and warranties as set forth herein at any time up to five
(5) business  days prior to Closing,  and each party will advise the other if it
determines that the  representations or warranties of the other are not true and
correct in any material respect. The failure by a party to advise the other when
such party knows a  representation  and  warranty of the other is not true or is
incorrect shall constitute a waiver thereof by such party. If a party amends the
schedules to  representations  and warranties as set forth herein,  or if either
party  determines that there is a breach of any  representation  or warranty and
such breach is not cured,  Purchaser and Seller shall negotiate in good faith on
an  appropriate  adjustment  to the  Purchase  Price for the 76 Assets.  In such
event:  (A) if the parties agree to an  adjustment to the Purchase  Price within
five (5)  business  days,  the  subject  schedules  to the  representations  and
warranties  will be  deemed  amended  for all  purposes  hereof,  and (B) if the
parties  cannot agree upon an adjustment  to the Purchase  Price within five (5)
business  days,  and if the  amendment or breach is  material,  then the counter
party to the party making the amendment or  committing  the breach may elect (i)
to terminate this Agreement under the provisions of Section 20(f), or (ii) waive
any breach hereunder,  or accept such amendment,  and continue with the Closing.
Notwithstanding  the  foregoing,  the Purchase Price shall not be reduced unless
the sum total of the agreed upon adjustments exceeds $30 million.

     22. Indemnification.
         ---------------

     (a) Indemnification by Seller. From and after the Closing, Seller agrees to
         -------------------------
pay and indemnify  fully,  hold harmless and defend  Purchaser and its officers,
directors, employees,  shareholders and representatives from and against any and
all claims  based upon  Damages  (as  defined in (d)  below),  whether  based on
negligent acts or omissions, statutory liability, strict liability or otherwise,
arising out of, resulting from or relating  to:
relating to:

     (i) any  inaccuracy or breach as of the Closing Date of any  representation
or warranty of Seller  contained in this Agreement or any agreement,  instrument

                                       27
<PAGE>

or  certificate  delivered  by Seller  pursuant  hereto and made at or as of the
Closing Date (other than the representations  concerning  environmental matters,
the sole remedy for which is set forth in the  Environmental  Agreement),  or of
any  covenant or agreement  of Seller  contained  in this  Agreement or any such
agreement or instrument;

     (ii) Retained  Liabilities,  including without  limitation any liability or
obligation in respect to the 76 Assets or the operations of the Products Company
prior to the  Closing  (subject  in the  case of  environmental  matters  to the
provision of the Environmental Agreement);

     (iii) Taxes in any manner  relating to the 76 Assets or the  operations  of
the Products  Company and  attributable to any taxable period or portion thereof
that ends on or before the Closing Date; or

     (iv) any claim by any  securityholder  of Seller's  securities based on any
action taken or disclosure made or omitted by Seller.

     (b)  Indemnification  by Purchaser.  From and after the Closing,  Purchaser
          -----------------------------
agrees to pay and to indemnify  fully,  hold  harmless and defend Seller and its
officers, directors,  employees and representatives from and against any and all
claims  based  upon  Damages,  whether  based on  negligent  acts or  omissions,
statutory  liability,  strict liability or otherwise,  arising out of, resulting
from or relating  to:

     (i) any  inaccuracy or breach as of the Closing Date of any  representation
or  warranty  of  Purchaser  contained  in  this  Agreement  or  any  agreement,
instrument or certificate  delivered by Purchaser pursuant hereto and made at or
as of the Closing Date or of any covenant or agreement of Purchaser contained in
this Agreement or any such other agreement or instrument;

     (ii) any  liability  or  obligation  assumed by  Purchaser  (A) pursuant to
Sections 7(a) and (b), and (B) any  environmental  liability or  obligation  for
which it is responsible under the Environmental Agreement.

     (iii) any liability or obligation arising out of the ownership or operation
of the 76 Assets or the Products  Company from and after the Closing (other than
Retained Liabilities as described in Section 22(a)(ii) above);

     (iv) any claim by any securityholder of Purchaser's securities based on any
action taken or  disclosure  made or omitted by Purchaser  (other than claims by
such  securityholders  against  Seller  based on  misstatements  in  information
specifically provided by Seller for inclusion in a registration  statement under
the Securities Act of 1933, as amended,  and so included with Seller's consent);
or

                                       28
<PAGE>

     (v) any lien,  penalty  or  interest  imposed  on Seller by any  applicable
assessment  jurisdiction with respect to any property tax returns filed by Tosco
or Tosco's  Agent,  or  required to be so filed,  with  respect to the 76 Assets
after the Closing.

     (c)  Third-Party  Claims.  If  any  action,   suit,   proceeding  or  claim
          --------------------
is commenced,  or if any claim,  demand or  assessment  is asserted,  by a third
party in respect  of which any  person  entitled  to be  indemnified  under this
Agreement  or  any  agreement  or  instrument  delivered  pursuant  hereto  (the
"Indemnified  Party") proposes to demand  indemnification  from the other person
(the "Indemnifying Party") in connection herewith or therewith, the Indemnifying
Party shall be given prompt  notice  thereof (a "Claim  Notice"),  together with
copies of written information  relating to such claims, and shall have the right
to assume  control of the defense,  compromise  or  settlement  thereof.  Unless
within 20 business  days after such notice is given to the  Indemnifying  Party,
the  Indemnifying  Party gives the  Indemnified  Party notice of its election to
assume such control,  the Indemnifying Party shall be deemed to have waived such
right.  If the  Indemnifying  Party does elect to assume such  control,  (i) its
defense against the action, suit,  proceeding or claim shall be conducted by the
Indemnifying  Party  and its  counsel  at its  expense  in a  manner  reasonably
satisfactory  and effective to protect the Indemnified  Party fully and (ii) the
Indemnifying Party and its counsel will keep the Indemnified Party fully advised
as to its conduct of such defense.  If the Indemnifying Party shall undertake at
any time to compromise any action, suit,  proceeding or claim, it shall promptly
notify the Indemnified  Party of its intention to do so. The Indemnifying  Party
shall not enter into any  compromise or settlement  hereunder  without the prior
written  consent  of  the  Indemnified   Party,   which  consent  shall  not  be
unreasonably  withheld.

         If the  Indemnifying  Party  should not elect to assume  control of the
defense or should fail to defend  against any such action,  suit,  proceeding or
claim,  or if it should  fail to conduct  such  defense  in a manner  reasonably
satisfactory  and  effective  to  protect  the  Indemnified   Party  fully,  the
Indemnified Party may assume control of the defense and, with the consent of the
Indemnifying Party, which shall not be unreasonably withheld, settle the action,
suit, proceeding or claim at the Indemnifying Party's expense.

         Notwithstanding  the foregoing,  each of the Indemnified  Party and the
Indemnifying  Party  shall  have the  right at all times to  participate  in the
defense of any action, suit, proceeding,  claims, demand or assessment hereunder
with its own counsel and at its own expense.

     (d)  Damages.  For purposes  hereof,  "Damages"  shall mean any  liability,
          --------
obligation, cost, damage, fine, penalty, charge or expense, including reasonable
legal fees and cost of  defending  any claim,  to the extent not  prohibited  by
law.
                                       29
<PAGE>

     23. Limitations of Liability.
         ------------------------

     (a) Subject to Section  23(b)  hereof,  with respect to any  inaccuracy  or
breach of any  representation  or warranty made by Seller in this Agreement,  or
any other agreement, instrument or certificate delivered pursuant hereto, or any
other breach or the  nonperformance  of Seller's  covenants and agreements under
this  Agreement  or such  other  agreements  or  instruments,  Seller's  maximum
liability to Purchaser  shall not exceed Seven  Hundred  Fifty  Million  Dollars
($750,000,000).

     (b) The limitation on Seller's  liability set forth in Section 23(a) hereof
shall not apply with respect to, and shall be in addition to, all costs  related
to Seller's  environmental  liabilities  and  obligations as provided for in the
Environmental Agreement and Retained Liabilities.

     (c)  Each  claim   against   Seller   after  the   Closing  for  breach  of
representation  or  warranty  shall be  subject  to a de  minimus  threshold  of
$350,000,  and Purchaser shall be entitled to recover claims which are in excess
of the de minimus  threshold  only to the extent the  aggregate  of such  claims
exceed $10 million.

     (d) Neither Seller nor Purchaser shall be liable for any special, punitive,
exemplary, consequential or indirect damages, or for lost profits.

     (e) Seller's and Purchaser's  representations  and warranties in Section 13
and 14,  respectively,  and all liability with respect thereto,  shall expire at
Closing, except that the following shall expire on the listed anniversary of the
Closing Date:

    First Anniversary:    13(i), 13(k), 13(o)
    Second Anniversary:   13(c), 13(d), 13(j), 13(l)(ii), 14(c), 14(d)
    Third Anniversary:    13(h), 13(q), 13(t), 14(g)
    Fifth Anniversary:    13(b), 13(e), 13(f), 13(l)(i), 13(p), 14(b), 14(f)
    No Expiration:        13(a), 13(s), 14(a)

     24. Records and Assistance.  (a) Notwithstanding Section 1(e), Seller shall
         ----------------------
have the right to make copies of any records of the  Products  Company for which
it has, or may have, any business,  technical or legal need, and Seller may have
the original of any record for which it has a  particular  need;  provided  that
Purchaser may make copies of any such records which Purchaser  reasonably  needs
for the continuing  operation of the Products Company.  To the extent that those
records,  or any other  information  made available to Purchaser before or after
the Closing,  contain proprietary or confidential  business,  technical or legal
information of Seller or its affiliates,  Purchaser  agrees to hold such records
in  confidence  and limit  their use to the 76 Assets or the  operations  of the
Products Company.

                                       30
<PAGE>

     (b)  Purchaser  shall not  destroy  or  otherwise  dispose  of any  records
acquired  hereunder for a period of seven years  (except as to tax records,  for
which the period  shall be the time when the  returns  for the year in  question
become final)  following  the Closing  Date,  except upon 30 days' prior written
notice to Seller,  during  which time Seller may elect to take such  records and
after which time Purchaser may destroy the same. During such seven-year  period,
Purchaser  shall  make  such  records  available  to  Seller  or its  authorized
representatives for any business, legal or technical need in a manner which does
not unreasonably interfere with Purchaser's business operations. For a period of
seven years from the Closing Date,  Purchaser  will also afford,  and will cause
its respective employees, agents, officers, directors, accountants and attorneys
to afford to the employees, agents,  representatives,  accountants and attorneys
of  Seller,  free  and  full  access  at all  reasonable  times  to the  assets,
properties,  books and records of Purchaser related to the Products Company that
existed  at or  prior to the  Closing  Date,  as  Seller  may from  time to time
request, for the purposes of responding to any governmental inquiry or any audit
conducted by any government,  including any governmental subdivisions,  agencies
and instrumentalities.

     (c)  On  reasonable  notice,   Purchaser  shall  permit  (with  appropriate
recompense  to  Purchaser  if the time is  extensive  and in a  manner  so as to
minimize  disruption)  its  employees  who were  former  employees  of Seller to
participate  on  Seller's  behalf in any  pending or  subsequent  litigation  or
alternative  dispute  resolution  proceeding on a matter  concerning  which such
employee  has   knowledge,   and   Purchaser   shall   respect  and  uphold  any
attorney-client  privilege or work product  privilege  that attaches to Seller's
former employees and documents.

     25.  Access  to 76  Assets  After  Closing.  Purchaser  shall  afford  duly
          -------------------------------------
authorized  representatives  of  Seller  reasonable  access  to  the  facilities
included in the 76 Assets with respect to any legal,  technical  or  operational
matter  relating  to  Seller's  obligations  under this  Agreement,  or Seller's
operation of the Products Company before Closing,  including without  limitation
removal of any Excluded Assets,  provided that Seller gives Purchaser reasonable
                                 --------
prior notice,  and provided  further that Seller's access does not  unreasonably
                   -----------------
interfere with Purchaser's normal  operations.  It is understood and agreed that
Seller shall remove all Excluded Assets prior to the Closing,  or, if necessary,
as soon as practicable thereafter.

     26.   Inspections.   (a)  Seller  agrees  to  give  to  Purchaser  and  its
           -----------
representatives  access during normal business hours to the facilities  included
in the 76 Assets  and to permit  Purchaser  to make,  or cause to be made,  such
investigations  of such  facilities and the  operations of the Products  Company
considers  necessary  or  advisable;  provided  that (i)  Purchaser  shall  give
                                      --------
reasonable  prior  notice,   (ii)  such  investigation  shall  not  unreasonably
interfere  with normal  operations  of Seller,  and (iii)  Seller shall have the
right  to  accompany   Purchaser  and  its   representatives   during  any  such
investigation at the facilities included in the 76 Assets. Seller also agrees to
make  available  to Purchaser  all such  documents  and copies of documents  and
information  with  respect to the 76 Assets and the  operations  of the Products
Company as Purchaser from time to time may reasonably request.

                                       31
<PAGE>

     (b) In the event that the Closing  contemplated by this Agreement shall not
occur, none of the information  received by Purchaser or its  representatives in
making such  inspection or  investigation  shall at any time or in any manner be
thereafter  utilized by  Purchaser  or be  disclosed  by  Purchaser to any other
persons to the material  detriment of Seller.  Any written documents provided by
Seller  shall,   upon  Seller's  written  notice,   be  destroyed  or  returned.
Notwithstanding  the  foregoing,  Purchaser  shall be free to  utilize  any such
information in connection with the exercise of its rights for any breach of this
Agreement by Seller.

     27. Operations of the Products Company and Actions.  Except as contemplated
         ----------------------------------------------
in, or provided  for by, this  Agreement or as required by any  applicable  law,
from the date hereof until the Closing,  Seller agrees and covenants that the 76
Assets shall be operated,  and the  operations of the Products  Company shall be
conducted,  only in the ordinary course of business in material  compliance with
all laws and regulations.  Without limiting the foregoing,  Seller shall not (i)
sell, mortgage, or otherwise transfer or convey any of the 76 Assets (other than
Inventory,   minor  matters  in  the  ordinary  course  of  business  and  those
transactions  identified on Schedule 27), (ii) except in the ordinary course and
consistent  with past practice in the conduct of the  operations of the Products
Company,  amend, modify,  terminate or suspend any of operations of the Products
Company (except in immaterial respects);  or (iii) except in the ordinary course
and  consistent  with past  practice  in the  conduct of the  operations  of the
Products  Company,  waive or relinquish any material right (except in immaterial
respects) under any Contract, Permit or applicable law. Seller shall continue in
the ordinary course (x) all scheduled  major refinery  turnarounds and tank work
reasonably  consistent in times and amounts with Attachment  XXIII,  (y) capital
expenditures reasonably consistent in times and amounts with Attachment XXI, and
(z) its  advertising  program in the  ordinary  course.  Seller may,  subject to
Purchaser's  review and  approval of  specific  plans,  continue  its program of
transferring the 76 Assets to one or more of the Subsidiaries.

     28. Publicity.  At all times prior to the Closing,  neither party will make
         ---------
any press release or other public  statement  concerning  this  Agreement or the
transactions contemplated hereby, or disclose the terms hereof or thereof to any
third party, except upon mutual agreement,  or as required by law or regulation,
or in connection  with any Permit  application in furtherance of this Agreement,
or as deemed  necessary  or  appropriate.  No public  statement  or  third-party
disclosure will be made without advance notice to the other party.

     29.  Employees  and  Benefits.   (a)  Purchaser  intends  to  give  special
          ------------------------
consideration to hiring current employees of Seller.  Therefore,  not later than
December 31, 1996,  Seller will furnish  Purchaser  with a complete and accurate
list of the employees whose employment is related  primarily to Seller's conduct
of the  operations  ("Seller's  Employees")  as of the date  hereof,  and  their
current  respective  base  salary or wage  rate,  as well as a list of  Seller's
Employees in management  level  positions to whom Seller will offer  alternative
employment.  Not later than  February 14,  1997,  Purchaser  shall  designate to


                                       32
<PAGE>

Seller in writing the names of Seller's  Employees to whom Purchaser has offered
or to whom Purchaser  intends to offer employment as of the Closing Date. Within
30 days after the Closing Date,  Purchaser will provide Seller with a final list
of all of Seller's Employees who accepted or rejected  employment with Purchaser
and in each case their applicable base salary or wage rate.  Seller's  Employees
who accept  employment  with  Purchaser as of the Closing Date or within 30 days
after the Closing Date are referred to herein as the "New Hires."

     (b) The  selection of the New Hires shall be entirely at the  discretion of
Purchaser and therefore Purchaser agrees to defend,  indemnify and hold harmless
Seller  and its  employees,  officers  and agents  from any  claims by  Seller's
employees regarding the selection process undertaken by Purchaser (including the
provision by Seller of information in response to requests by Purchaser) and for
employment  actions as to New Hires  occurring  subsequent  to the Closing Date,
including   Purchaser's   alleged  violations  of  Federal  or  State  labor  or
anti-disclosure laws.

     (c) Purchaser  assumes no obligations or liabilities with respect to any of
Seller's  existing  employee  benefit and pension plans,  programs,  agreements,
arrangements or policies,  whether or not subject to ERISA. Purchaser assumes no
obligations or liabilities  with respect to any existing  collective  bargaining
agreement under which Seller is obligated.  Purchaser  understands  that certain
groups of Seller's  Employees are currently  represented  by various  unions for
collective bargaining purposes. Seller shall give all necessary WARN Act notices
and other notices to employees  required of Seller by law or labor agreements as
a result of the transactions contemplated hereby.

     (d) All obligations or liabilities  whatsoever  whether  accruing before or
after  the  Closing  Date or at any time by  reason  of  Seller  (or any  entity
required to be  aggregated  with Seller  pursuant to Section 414 of the Internal
Revenue  Code of 1986,  as amended or Section  4001 of ERISA)  contributing  to,
maintaining,   discontinuing,   terminating,  or  ceasing  participation  in  or
withdrawing  from any  employee  benefit,  welfare or pension  plan or  program,
including  without  limitation,  severance pay obligations  accruing during such
employee's   employment   by  Seller,   shall  be  and  remain   Seller's   sole
responsibility and obligation except as otherwise specifically provided herein.

     (e) Seller will make available to Purchaser a true and complete copy of (or
a  description  of) each  employee  benefit plan as defined in section  3(93) of
ERISA and each  other  employee  benefit  plan,  arrangement,  program or policy
maintained  or  contributed  to by  Seller  for  Seller's  Employees,  including
(without  limitation)  any arrangement  providing for profit  sharing,  bonuses,
fringe benefits and executive compensation.  Seller has delivered to Purchaser a
true and complete copy of each  collective  bargaining  agreement  pertaining to
Seller's Employees.

     (f) Prior to the Closing  Date,  Seller  shall make  available to Purchaser
true,  correct and  complete  copies of all  payroll and benefit  records of New
Hires necessary to effectuate  such transfer of employment.  Seller has obtained
and maintained a Form I-9 for each Employee if required by law and, prior to the

                                       33
<PAGE>

Closing Date,  Seller will afford Purchaser and its  representatives  reasonable
access  to  Seller's  employees  and such  documents  of  Seller  as will  allow
Purchaser to verify this information with respect to New Hires.

     (g) Seller  shall not increase the base salary or wage rate of any employee
so as to render  untrue  the  salary  and wage  information  made  available  to
Purchaser pursuant to Section 29(a), other than regularly  scheduled  increases,
promotions in the normal course or pursuant to collective bargaining agreements.

     (h) If  Purchaser  terminates  any of the New Hires  within one year of the
Closing Date for reasons other than misconduct,  such employee shall be eligible
for the  Severance  Benefits he or she would have been  eligible  for had Seller
terminated such employee as of the Closing Date.  "Severance Benefits" means the
Unocal  Termination  Allowance Plan benefits,  the salary or wage portion of the
Unocal  Employee  Redeployment  Program,  tuition  reimbursement  up  to  $2500,
outplacement assistance,  and subsidized COBRA rates in accordance with terms of
Seller's plans and programs as in effect on or before November 17, 1996.

     (i) Seller shall be  responsible  for paying any retention  incentives  and
Severance Benefits with respect to Seller's Employees. Except for the subsidized
COBRA rates,  Seller shall also be responsible for paying the Severance Benefits
of those  covered under Section  29(h) above.  However,  Purchaser  shall pay to
Seller  an  amount  equal  to the  sum of (A)  50% of the  amount  of  retention
incentives,  plus (B) 50% of the  amount of  Severance  Benefits  paid by Seller
pursuant to Section 29(h), plus (C) 50% of the amount of Severance Benefits paid
by Seller pursuant to this Section 29(i) with respect to those employees who are
not offered employment by Purchaser nor offered continued employment with Seller
on or after the  Closing  Date,  reduced  by 50%  (fifty  percent)  of any COBRA
subsidy provided by Purchaser.

     (j) Seller will offer  retiree  medical  coverage to those of the New Hires
who were at least 55 years of age with 10 years of  Service  and who would  have
been  eligible for retiree  medical  coverage as of the Closing Date or on their
Normal Retirement Date in accordance with the terms of Seller's  applicable plan
as of the date any such  employee  shall elect said  retiree  medical  coverage.
Purchaser  will not  offer  retiree  medical  coverage  to said  employees,  but
Purchaser  shall offer retiree  medical  coverage to other New Hires on terms at
least as favorable as apply to similarly situated employees of Purchaser.

     (k) Purchaser will recognize under its applicable  retirement plans the New
Hire's  service  recognized  by Seller as of the  Closing  Date for  purposes of
eligibility,  vesting,  any waiting periods and benefit accruals,  subject to an
offset for any benefits payable under Seller's retirement plan.  Purchaser shall
recognize  under its  applicable  retiree  medical plan New Hire's  service with
Seller for purposes of  eligibility  and benefit  accruals  under such Purchaser
plan,  subject to Section  29(j) above.  Purchaser  shall  recognize  New Hire's

                                       34
<PAGE>

service  with Seller for  purposes of  eligibility  and  waiting  periods  under
Purchaser  employee welfare benefit plans (including  without  limitation 401(k)
and  other  profit  sharing  plans)  and  for  future  vacation  accruals  under
Purchaser's vacation plan or policy applicable to such New Hire.

     30. Transfer of Permits.  It shall be Purchaser's  responsibility to obtain
         -------------------
the  issuance or  transfer of all  environmental  and other  Permits;  provided,
however,  that Seller shall  cooperate with any efforts of Purchaser to complete
the actions  required in connection with  transferring or obtaining the issuance
of all such Permits.  During any interim  between the Closing and the completion
of the  transfer  or issuance of any such  Permit in  Purchaser's  name,  Seller
agrees to  provide  Purchaser  with the  benefits  of such  Permit to the extent
permitted by applicable law and provided Purchaser assumes all  responsibilities
and liabilities under any such Permit with respect to the period after Closing.

     31. Certain Tax Matters, Etc.
         ------------------------

     (a) Purchase Price Allocation. Purchaser and Seller hereby agree to attempt
         -------------------------
to  allocate  in good  faith  the  purchase  price  paid  for the 76  Assets  in
accordance  with Section 1060 of the Internal  Revenue Code of 1986, as amended,
among the properties and assets  conveyed to Purchaser  hereunder  (including in
the case of any  subsidiary  for which a Section  338(h)(10) is made pursuant to
Section 31(h) below,  the assets of such  subsidiary),  and the parties agree to
cooperate in good faith in the  completion  and filing of United States  federal
income tax Form 8594 in accordance  with the price  allocation.  Such allocation
shall also include an allocation of the Purchase  Price to the Real Property for
purposes of Sections 17(d) and 31(b).  The parties  further agree that they will
report the tax  consequences  of the  purchase  and sale  hereunder  in a manner
consistent with the price allocation, if one has been agreed upon, and that they
will not take any position inconsistent  therewith in connection with the filing
of any  Return.

     (b) Real Estate Transfer Fees. Purchaser shall pay any real estate transfer
         -------------------------
fee imposed on the consideration  from conveyance of realty under this Agreement
and shall be entitled to reimbursement therefrom from Seller or a credit against
the Purchase  Price.

     (c) Recording and Filing Fees. Purchaser shall pay any recording and filing
         -------------------------
fees  imposed  in   connection   with  the   conveyance  of  realty  under  this
Agreement.

     (d) Sales  and Use  Taxes.  Seller  shall pay all  applicable  sales  taxes
        -----------------------
imposed upon the sale of tangible personal property under this Agreement.  It is
understood  by Seller and  Purchaser  that  delivery of vessels shall take place
outside of the State of California  and Purchaser  represents  that said vessels
shall not enter the State of California  other than in  interstate  commerce and
shall be used continuously in interstate commerce. It is further understood that
the  consideration  for the sale of  tangible  personal  property is exempt from
California  sales and use tax as a sale for resale as defined  under  California
Sales and Use Tax Law, to the extent said tangible personal property is included
in service  station  property  leased to third parties or  inventory.  Purchaser

                                       35
<PAGE>

shall issue a valid resale  certificate  with  respect to all tangible  personal
property  which is eligible for an exemption from any tax in any state as a sale
for  resale.

     (e)  Federal  and State  Taxes on  Inventory.  Taxes  with  respect  to the
          ---------------------------------------
Inventory shall be governed by Section II.S. of Attachment  IX.

     (f) Computer  Software  Programs.  The transfer of any prewritten  computer
         ---------------------------- 
software program pursuant to this Agreement shall, to the extent practicable, be
by remote telecommunications from Seller's to Purchaser's computer and Purchaser
shall not obtain possession of any tangible personal  property,  such as storage
media, in any such  transaction.

     (g)  Cooperation.  Seller and  Purchaser  will provide each other with such
          -----------
cooperation  and  information as each may  reasonably  request of the other with
regard to the preparation  and filing of Returns,  or the conduct of an audit or
other  proceeding in respect of  Taxes.

     (h) Section 338(h)(10)  Election.  To the extent that the 76 Assets include
         ----------------------------
the stock of any  subsidiary  corporation,  Seller will join with  Purchaser  in
making an election  under Section  338(h)(10) of the Internal  Revenue Code (and
any corresponding elections under state, local, or foreign tax law) with respect
to the purchase and sale of the stock of each  subsidiary.  Seller's return will
reflect  any tax  attributable  to the  making  of the  election  under  Section
338(h)(10).

     (i) Property Taxes.  All ad valorem taxes,  real property  taxes,  personal
         --------------
property taxes, special assessments, direct assessments, general assessments and
similar obligations (and any refunds, credits and the like) shall be apportioned
as of the Closing Date between Seller and Purchaser,  pursuant to Section 4. Any
such tax,  assessment or similar obligation with a payment delinquent date on or
before  the  Closing  Date  shall be paid by  Seller,  and any such  item with a
payment  delinquent  date after the Closing Date shall be paid by Purchaser.  To
the extent that the payments differ from the apportionments  required by Section
4,  appropriate  adjustments  shall be made  pursuant to Section 4. Seller shall
file or cause to be filed all  required  reports  and  returns  incident to such
taxes which are due on or before the Closing Date,  and Purchaser  shall file or
cause to be filed all required  reports and returns incident to such taxes which
are due after Closing Date.  The  obligation  for filing  reports and returns or
payment of property  taxes can be altered by the mutual  agreement  of Purchaser
and Seller.  Notwithstanding  any other provision hereof, any Taxes which may be
imposed  by reason of the  failure of a party to make a payment or file a report
or  Return as above  provided  (or as  otherwise  agreed)  shall be  solely  the
obligation of such  party.

                                       36
<PAGE>

     (j)  Definitions. For the purposes of this Agreement:
          -----------

         "Returns"  shall  mean all  federal,  state,  local,  foreign  or other
governmental   income  and  franchise  returns  and  all  sales,  use,  payroll,
withholding  and other tax returns,  and "Non-Income Tax Returns" shall mean all
such Returns other than net income tax returns; and

         "Taxes" shall mean any and all federal, state, local and foreign taxes,
charges, fees, levies, imposts, assessments, withholdings, impositions, or other
similar  governmental  charges  and any  interest,  liens,  additions  to tax or
penalties thereon.

     32. Bulk Sales.  Seller and Purchaser  agree to waive  compliance  with any
         ----------
applicable bulk sales laws.

     33.  Construction.  This  Agreement  shall be governed by and  construed in
          ------------
accordance with the laws of the State of California without giving effect to its
conflicts-of-laws  principles (other than any provisions  thereof validating the
choice of the laws of the State of California as the governing law).

     34. Entire  Agreement.  This  Agreement,  together with the Attachments and
         -----------------
Schedules  hereto,  and the agreements  and  instructions  contemplated  herein,
constitutes  the entire  agreement  among the parties  pertaining to the subject
matter hereof and supersedes all prior or contemporaneous agreements relating to
the subject  matter  hereof.  In case of any  conflict  between the body of this
Agreement and any such Attachment,  Schedule, agreement or instrument, the terms
of the body of this Agreement shall prevail.

     35. Assignment.  (a) Subject to Section 35(b),  hereof,  this Agreement may
         ----------
not be assigned in whole or in part  without  the prior  written  consent of the
other party.

     (b) Seller and  Purchaser  may each assign this  Agreement,  in whole or in
part, to one or more of their  respective  affiliates,  upon prior notice to the
non-assigning  party;  provided,  that the non-assigning  party may require as a
                       --------
condition of such  assignment that the assigning  party  reasonably  demonstrate
and/or assure the assignee's  financial and technical  capability to perform its
proposed  obligations  hereunder.  Any attempted assignment of this Agreement in
violation  of this  Section  35  shall  be null and  void.  Notwithstanding  the
foregoing,   Purchaser's   obligation   under  the  Escrow   Agreement  and  the
Shareholders  Agreement  may not be  assigned.

     (c) This Agreement  shall inure to the benefit of, and be binding upon, the
parties hereto and their respective heirs, legal representatives, successors and
permitted  assigns,  except  that any such  assignment  shall  not  relieve  the
assigning party of its obligations hereunder. This Agreement is not intended to,
and does not create, any rights in any third parties.

                                       37
<PAGE>

     36.  Further  Assurances.  Each  of the  parties  hereto  shall  take  such
          -------------------
additional  action,  and shall cooperate with one another,  as may be reasonably
necessary  to  effectuate  the  terms of this  Agreement  and any  agreement  or
instrument  delivered pursuant hereto,  including effecting the working transfer
of the 76 Assets and the operations of the Products Company to Purchaser.

     37. Payments. (a) Unless otherwise specified herein, any payment to be made
        ----------
hereunder  shall  be made in  U.S.  dollars  by  wire  transfer  of  immediately
available funds,  without  discount or deduction,  or by such other means as the
parties may agree.

     (b) Any  amount  not paid by either  party  when due  hereunder  shall bear
interest from the date upon which payment was due through the date of payment at
a rate equal to one percent  (1%) above the prime rate of interest as  announced
by Chase Manhattan Bank N.A. in New York City from time to time.

     38.  Notices.  (a) All  notices,  requests,  demands,  consents  and  other
          -------
communications  required or  permitted  to be given or made  hereunder  shall be
deemed to have  been  duly  given or made if  delivered  personally,  or sent by
overnight courier delivery or by telecopy or similar facsimile transmission (and
confirmed in writing  thereafter),  or mailed by prepaid registered or certified
mail, return receipt requested, to the other party at the respective address set
forth below (or to such other  address as a party shall  designate for itself by
written notice given or made in accordance herewith):

            (i)   if to Seller, to it at:

                  UNOCAL Corporation
                  2141 Rosecrans Avenue, Suite 4000
                  El Segundo, California 90245

                  Attn:    Neal E. Schmale,
                                    Chief Financial Officer
                                    (310) 726-7621 (Phone)
                                    (310) 726-7806 (Fax)

                  cc:      Dennis P.R. Codon, Esq.
                                    General Counsel
                                    (310) 726-7651
                                    (310) 726-7815 (Fax)

                                       38
<PAGE>


             (ii) if to Purchaser, to it at:

                  Tosco Corporation
                  72 Cummings Point Road
                  Stamford, Connecticut 06902

                  Attn:    Wilkes McClave III, Esq.
                                    General Counsel
                                    (203) 977-1005 (Phone)
                                    (203) 964-3187 (Fax)


     (b) Any notice,  request or other  communication  hereunder shall be deemed
delivered  and  given or made on the  seventh  business  day  after  the date of
mailing, if mailed by registered or certified mail, or on the first business day
after the date of  transmittal,  if sent by courier  delivery  or by telecopy or
similar facsimile transmission (and confirmed in writing thereafter),  or on the
first business day after the date of delivery, if delivered personally.

     39.   Counterparts.   This  Agreement  may  be  executed  in  one  or  more
           ------------
counterparts, each of which shall be deemed to be an original instrument.

     40.  Waiver.  It is agreed that any party to this Agreement may extend time
          ------
for  performance  by any other  party  hereto or waive  the  performance  of any
obligation  of  any  other  party  hereto  or  waive  any  inaccuracies  in  the
representations  and warranties of any other party, but any such waiver shall be
in writing,  unless a non-written waiver is expressly  permitted,  and shall not
constitute  or be  construed  as a waiver  of any other  obligation,  condition,
representation or warranty under this Agreement.

     41.  Amendments.  This  Agreement  cannot be altered,  amended,  changed or
          ----------
modified in any respect or particular  unless each such  alteration,  amendment,
change or  modification  shall have been agreed to by each of the parties hereto
and reduced to writing in its entirety and signed and delivered by each party.

     42. Time of  Essence.  Time is of the  essence in the  performance  of each
         ----------------
covenant and agreement of this Agreement.

     43. Independent Decisions.  Purchaser has made its own independent judgment
         ---------------------
of the commercial  potential,  condition and usefulness of the 76 Assets, taking
into  consideration  all current  environmental  laws and  requirements  and the
likelihood that such laws and requirements will change in the future.  Purchaser
has such knowledge and experience in business and financial  affairs in general,
and of the oil refining  business as conducted  and  regulated in  California in
particular,  as to be capable of  evaluating  the merits and risks of purchasing
the 76 Assets,  taking into  account the  accuracy  of the  representations  and

                                       39
<PAGE>

warranties  contained  in  Section  13  hereof,  and  also the  accuracy  of the
information provided to Purchaser during the due diligence period.

     44. Glossary. As used in this Agreement (or, if so indicated,  with respect
         --------
to particular  Sections  hereof),  the following terms have the meanings defined
for such terms in the Sections set forth below:


   Term                                                   Section
   ----                                                   -------
   76 Assets .............................................1(a)
   Assignment and Assumption .............................10(b)(ii)
   Audited Financial Statements ..........................13(t)
   Base Purchase Price ...................................3(a)
   Bill of Sale ..........................................10(b)(ii)
   Claim Notice ..........................................22(c)
   Closing ...............................................10(a)
   Closing Date ..........................................10(a)
   COBRA coverage ........................................7(c)(iii)
   Consent ...............................................13(c)
   Contracts .............................................1(a)
   Damages .............................................. 22(d)
   Deed(s) .............................................. 10(b)(i)
   Environmental Agreement .............................. 15
   Environmental Laws ................................... 15
   Equipment ............................................ 1(a)
   ERISA ................................................ 7(c)(iii)
   Escrow ............................................... 5(a)
   Escrow Agent ......................................... 5(a)
   Escrow Agreement ..................................... 5(a)
   Excluded Assets ...................................... 2
   GAAP ................................................. 13(t)
   Indemnified Party .................................... 22(c)


                                       40
<PAGE>

   Term                                                   Section
   ----                                                   -------
   Indemnifying Party ................................... 22(c)
   Improvements ......................................... 1(a)
   Insurable ............................................ 17(d)
   Intellectual Property ................................ 1(a)
   Intellectual Property Agreement ...................... 8(a)
   Inventory ............................................ 1(a)
   Market Price ......................................... 5(a)
   Market Value ......................................... 5(a)
   Material Loss Event (Section 19 only) ................ 19(a)
   Material Contract .................................... 13(k)(iii)
   New Hires ............................................ 29(a)
   Non-Income Tax Returns ............................... 31(j)
   Participation Payment Agreement ...................... 3(c)
   Permits .............................................. 13(c)
   Permitted Exceptions ................................. 1(b)
   Pipelines ............................................ 1(a)
   PMPA ................................................. 7(b)(i)
   Products Company ..................................... Recitals
   Purchase Price ....................................... 3
   Purchaser ............................................ Recitals
   Purchaser Services ................................... 8(b)(i)
   Purchaser Services Agreement(s) ...................... 8(b)(i)
   Purchaser's Agreements ............................... 18(b)(ii)
   Real Property ........................................ 1(a)
   Release of Hazardous Substances ...................... 15
   Reported Encumbrance ................................. 17(b)
   Retained Liabilities ................................. 7(c)
   Returns .............................................. 31(j)

                                       41
<PAGE> 

   Term                                                   Section
   ----                                                   -------

   Self-Amortizing Notes ................................ 1(g)
   Seller ............................................... Recitals
   Seller Services ...................................... 8(b)(ii)
   Seller Services Agreement(s) ......................... 8(b)(ii)
   Seller's Agreements .................................. 18(a)(ii)
   Seller's Employees ................................... 29(a)
   Severance Benefits ................................... 29(h)
   Shared Software License Agreement .................... 2(b)
   Shareholder Agreement ................................ 5(a)
   Shares ............................................... 5(a)
   Subsidiaries ......................................... 1(a)
   Survey ............................................... 17(a)
   Taxes ................................................ 31(j)
   Vessels .............................................. 1(a)
   WARN ................................................. 7(c)(iii)
   Withdrawal Area ...................................... 7(b)(ii)

                            [SIGNATURE PAGE FOLLOWS]

                                       42
<PAGE>
                         




         IN WITNESS WHEREOF, the parties have executed this Agreement on the day
and year first written above.

ATTEST:                            UNION OIL COMPANY OF CALIFORNIA

 /s/ Joseph A. Householder       By:  /s/ Roger C. Breach
- ---------------------------           --------------------
JOSEPH A. HOUSEHOLDER                 ROGER C. BEACH
Vice President, Tax                   Chairman and Chief Executive Officer



ATTEST                             TOSCO CORPORATION

 /s/ Wilkes McClave III          By:  /s/ Thomas D. O'Malley
- ---------------------------           --------------------
WILKES MCCLAVE III                    THOMAS D. O'MALLEY
Senior Vice President                 Chairman and Chief Executive Officer
and General Counsel





               


                                                                     EXHIBIT 2.2



                                 ATTACHMENT XIV




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





                    STOCK PURCHASE AND SHAREHOLDER AGREEMENT


                                 By and Between


                                TOSCO CORPORATION


                                       and


                        UNION OIL COMPANY OF CALIFORNIA



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

                          Dated as of January 15, 1997
                          ----------------------------







<PAGE>


                    STOCK PURCHASE AND SHAREHOLDER AGREEMENT


     THIS STOCK PURCHASE AND SHAREHOLDER  AGREEMENT,  is dated as of January 15,
1997 ( "Agreement"),  between and among TOSCO CORPORATION,  a Nevada corporation
("Tosco"),  and  UNION OIL  COMPANY  OF  CALIFORNIA,  a  California  corporation
("Union").

                            RECITALS
                            --------

          WHEREAS,  Tosco  and  Union  have  entered  into a Sale  and  Purchase
Agreement for the business and assets of the 76 Products  Company dated December
14, 1996 ("Sale and Purchase Agreement"),  pursuant to which Tosco agreed to buy
and Union agreed to sell the business and assets that constitute the 76 Products
Company segment of Union ("76 Products' Business and Assets"); and

          WHEREAS,  the Sale and Purchase  Agreement  provides that a portion of
the  purchase  price for the 76 Products  Business  and Assets may be payable in
Common Stock of Tosco, $.75 par value; and

          WHEREAS,  Tosco and Union have entered into an Escrow  Agreement dated
January 15, 1997 ("Escrow  Agreement"),  and,  pursuant to the Sale and Purchase
Agreement, deposited this Agreement into escrow.

          NOW, THEREFORE, the parties agree as follows:

     1.  Definitions.  For all purposes of this  Agreement,  the following terms
shall have the following  meanings (such meanings to be equally  applied to both
the singular and plural forms of the terms defined); all terms of this Agreement
that are not defined specifically herein shall have the meaning assigned to them
in the Sale and Purchase Agreement:

          "Affiliate"  of any  specified  Person  shall  mean any  other  Person
directly or indirectly  controlling or controlled by or under direct or indirect
common control with such specified Person.

          "Agreement" shall have the meaning set forth in the preamble hereof.

          "Board" shall mean the board of directors of Tosco.

          "Business  Day" shall mean a day,  other than a Saturday  or a Sunday,
when commercial banks are open for business in Los Angeles,  California, and New
York City, New York.

                                       1
<PAGE>


          "Closing"  shall have that  meaning set forth in Section  10(a) of the
Sale and Purchase Agreement.

          "Common Stock" shall mean the shares of Tosco common stock,  par value
of $.75, delivered to Union pursuant to Section 2 of this Agreement and which at
the relevant date is beneficially  owned by Union or an Affiliate of Union,  and
all shares of such common  stock  issued  pursuant to a stock  split,  dividend,
reorganization, reclassification, or recapitalization of such common stock.

          "Derivative Security" shall mean a security issued by Union or any one
or more of its Affiliates which is convertible,  exchangeable or exercisable for
Common Stock.

          "Escrow  Account"  shall have the meaning set forth in Section 3(b) of
the Escrow Agreement.

          "Escrow Agent" shall have the meaning set forth in the Preamble of the
Escrow Agreement.

          "Exchange  Act" shall mean the  Securities  Exchange  Act of 1934,  as
amended.  Each  reference to the Exchange  Act or a rule or  regulation  adopted
under the Exchange Act shall mean the Exchange Act or the rule or  regulation as
in effect at the time for application of a provision of this Agreement.

          "Market  Price"  shall mean the  average of the daily  averages of the
high and low trading prices for Purchaser  common stock reported on the New York
Stock  Exchange  Composite  tape for the ten business days preceding the Closing
Date,  but in no case less than $45 per share unless Tosco elects,  by execution
and delivery of Supplement No. 1 attached to this Agreement, to issue sufficient
shares  of Common  Stock  such  that the  Market  Value is equal to (i) the Base
Purchase  Price  pursuant to Section  3(a) of the Sale and  Purchase  Agreement,
minus (ii) the fair market value of the cash and  marketable  securities  (other
than the right to receive  Common  Stock) in the Escrow  Account on the  Closing
Date.

          "Market Value" shall mean the Market Price multiplied by the number of
shares of Common Stock to be delivered.

          "Person"  shall  mean  any  corporation,  limited  liability  company,
natural  person,  firm,  joint  venture,   partnership,   trust,  unincorporated
organization,  enterprise,  other legal entity,  government or any department or
agency of any government.

          "Securities  Act" shall mean the  Securities  Act of 1933, as amended.
Each reference to the  Securities Act or a rule or regulation  adopted under the
Securities  Act shall mean the  Securities  Act or the rule or  regulation as in
effect at the time for application of a provision of this Agreement.

                                       2
<PAGE>

          "Shareholder" shall mean any holder of shares of Common Stock.

     2.   Purchase and Sale. At Closing, Tosco will deliver to Union, as partial
          -----------------

consideration, a number of shares of Common Stock, to be determined as follows:

          The number of shares shall equal:

               (a) the Base Purchase  Price pursuant to Section 3(a) of the Sale
               and Purchase  Agreement,  minus the fair market value of cash and
               marketable  securities  (other  than the right to receive  Common
               Stock) in the Escrow Account on the Closing Date,

               Divided by

               (b) the Market Price.

     3.   Representations and Warranties of Union.
          --------------------------------------- 

          (a) Union (i) is a qualified  institutional  buyer, (ii) is aware that
the sale of the Common  Stock to it is being made in reliance  upon an exemption
to  registration  under the  Securities  Act, and (iii) is acquiring such Common
Stock for its own account;

          (b) Union  understands  that the Common Stock has not been  registered
under the Securities Act and may not be reoffered,  resold, pledged or otherwise
transferred by Union except (a)(i) to a person who Union reasonably  believes is
a qualified institutional buyer acquiring for its own account or for the account
of a qualified  institutional buyer in a transaction meeting the requirements of
Rule  144A  under  the  Securities  Act,  (ii)  pursuant  to an  exemption  from
registration  under  the  Securities  Act,  (iii)  in  an  offshore  transaction
complying with Rule 903 or Rule 904 of Regulation S under the Securities Act; or
(iv) in a transaction registered under the Securities Act, and (b) in accordance
with all applicable securities laws of the states of the United States and other
jurisdictions;

          (c) The certificates  evidencing the Common Stock will bear legends to
the following  effect,  unless Tosco  determines  otherwise in  compliance  with
applicable law:

          (i) "THE COMMON STOCK EVIDENCED  HEREBY HAS NOT BEEN REGISTERED  UNDER
          THE U.S. SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT") AND
          MAY NOT BE OFFERED,  SOLD,  PLEDGED OR  OTHERWISE  TRANSFERRED  EXCEPT
          (A)(i)  TO A PERSON  WHO  UNION  REASONABLY  BELIEVES  IS A  QUALIFIED
          INSTITUTIONAL  BUYER  ACQUIRING FOR ITS OWN ACCOUNT OR FOR THE ACCOUNT
          OF A  QUALIFIED  INSTITUTIONAL  BUYER  IN A  TRANSACTION  MEETING  THE
          REQUIREMENTS  OF RULE 144A UNDER THE SECURITIES  ACT, (ii) PURSUANT TO
         

                                       3
<PAGE>

          AN EXEMPTION FROM  REGISTRATION  UNDER THE SECURITIES ACT, (iii) IN AN
          OFFSHORE TRANSACTION COMPLYING WITH RULE 903 OR RULE 904 OF REGULATION
          S UNDER THE SECURITIES ACT; OR (iv) IN A TRANSACTION  REGISTERED UNDER
          THE  SECURITIES  ACT,  AND  (B)  IN  ACCORDANCE  WITH  ALL  APPLICABLE
          SECURITIES  LAWS  OF  THE  STATES  OF  THE  UNITED  STATES  AND  OTHER
          JURISDICTIONS."

          (ii) "THE SHARES  EVIDENCED HEREBY ARE SUBJECT TO A STOCK PURCHASE AND
          SHAREHOLDERS   AGREEMENT,   DATED  AS  OF   JANUARY   15,   1997  (THE
          "SHAREHOLDERS AGREEMENT", A COPY OF WHICH MAY BE OBTAINED FROM TOSCO),
          THE SHARES ARE  TRANSFERRABLE  ONLY IN ACCORD  WITH AND SUBJECT TO THE
          CONDITIONS OF THE  SHAREHOLDERS  AGREEMENT,  AND, ONCE  TRANSFERRED BY
          UNION TO ANY PERSON, NOT AN AFFILIATE OF UNION, OWNING LESS THAN 5% OF
          TOSCO'S  COMMON  STOCK  AFTER THE  TRANSFER,  ARE NOT  SUBJECT  TO THE
          SHAREHOLDERS AGREEMENT."

     4.   Covenants of Union.  Union agrees as follows:
          ------------------

          (a) Promise to Liquidate. Union shall undertake to sell, distribute or
              --------------------
otherwise  dispose of the Common Stock as soon as reasonably  practical in light
of  market  conditions  so as to  maximize  the  price  received  by Union  upon
disposition  of all of the  Common  Stock.  In making its  decisions  concerning
timing and method of any disposition of Common Stock, Union shall consult with a
nationally  recognized investment banking firm and be fully protected in relying
on the advice of any such firm.

          (b) Share  Voting.  Union  shall  arrange  for the Common  Stock to be
              -------------
present  at all  shareholders'  meetings  of Tosco and shall  vote its shares in
proportion,  for,  against  and  in  abstention,  to  the  votes  of  the  other
shareholders  present at such meeting,  if the vote relates to a matter on which
the interest of Union and the interests of the other shareholders are reasonably
similar.  If any Person solicits written consent for action from shareholders of
Tosco,  Union shall deliver to the Person  soliciting  such  consent,  a written
consent  which  shall,  at a time that the written  consent  becomes  effective,
consents to the action by a percentage  of the Common Stock that is equal to the
percentage by which all other shares, not held by Union consented to the action.

          (c) Standstill Provision.  Union shall not acquire any common stock of
              --------------------
Tosco or  securities  convertible  into  common  stock of Tosco nor shall  Union
propose  to  Tosco  or  any  Person  any  acquisition   transaction   (excluding
transactions in the ordinary course of business of the type previously conducted
by Union and Tosco)  between Union and Tosco and/or the Tosco  security  holders
involving any of their  respective  securities or assets unless Tosco shall have
requested in writing that Union make such a proposal.

                                       4
<PAGE>

          (d) Passivity Provision. Union shall not, directly or indirectly:
              -------------------

     (i) seek representation on or seek to influence Tosco's Board of Directors;

     (ii) solicit or participate in soliciting proxies or actions by
written  consent with respect to any matter  presented  to the  shareholders  of
Tosco;

     (iii) encourage any third party to seek control of Tosco;
               

     (iv) propose a slate of directors  in  opposition  to any slate of nominees
proposed by management or the Board of Directors of Tosco; or

     (v)  without  consent of Tosco,  sell  Common  Stock to anyone  who,  after
completion of such sale, would own more than 5% of the common stock outstanding,
except in the case of sale into a public tender offer  available to shareholders
generally and except a sale to underwriters  who purchase in the ordinary course
of their  business  with a view toward  subsequent  resale (other than resale to
anyone who such underwriter knows, after completion of such sale, would own more
than 5% of the common stock outstanding).

     5.   Covenants of Tosco.  Tosco agrees as follows:
          ------------------

     (a) Share Listing.  Tosco shall list the Common Stock on the New York Stock
         -------------
Exchange.

     (b) Best  Efforts.  Tosco shall use its best efforts to obtain  shareholder
         -------------
approval for the issuance of Common Stock.

     (c) Accountant's Letters. Tosco shall deliver(i) to Union at Closing a
         --------------------
letter from Tosco's  independent  public  accountants which shall be in the form
permitted by Statement on Auditing Standards No. 75, and (ii) to each person who
would be entitled to receive,  and who requests,  a comfort  letter  pursuant to
Statement  on  Auditing  Standards  Nos.  72 and 76 at the  closing of any other
transaction in Common Stock, in each case applying procedures no more burdensome
than those  described  in the form of comfort  letter  customarily  delivered by
Tosco's  independent public  accountants in connection with underwritten  public
offerings of Tosco common stock.

     (d) Sale or Disposition of Common Stock.  Tosco acknowledges that Union may
         -----------------------------------
dispose of Common  Stock in one or more of several  methods,  including  but not
limited to: (i) a registered offering of Common Stock or Derivative  Securities;
(ii) an offering of Common Stock or Derivative Securities under Rule 144A of the
Securities Act; (iii) an offering of Common Stock or Derivative Securities under
Regulation S of the Securities  Act; or (iv) a  distribution  of Common Stock to
shareholders  of Union  and its  Affiliates  in a  transaction  which is  either
required  to  be  registered   under  the  Securities  Act  or  is  exempt  from

                                       5
<PAGE>

registration  under the Securities Act. Tosco shall do all things  reasonable or
beneficial in order to assist Union in selling or disposing of the Common Stock,
including the following:

               (i) If Union has sold Common Stock or  Derivative  Securities  in
reliance on a private placement exemption, Tosco agrees that it will not solicit
any  offer  to buy or offer  to sell  the  Common  Stock by means of any form of
general  solicitation  or general  advertising (as defined in Regulation D under
the  Securities  Act) or in any manner  involving a public  offering  within the
meaning of 4(2) of the Securities Act ;

               (ii) Tosco shall not engage in any directed  selling efforts with
respect  to the  Common  Stock  within the  meaning  of  Regulation  S under the
Securities  Act and  Tosco and each  such  person  acting on behalf of Tosco has
complied  and  will  comply  with  the  offering  restrictions   requirement  of
Regulation S;

               (iii) If  Union  sells  Derivative  Securities  in a  transaction
exempt from  registration  pursuant to Rule 144A under the Securities  Act, then
during the three year period following the last closing date of a sale by Union,
Tosco shall make available,  if it is not then subject to Section 13 or 15(d) of
the Exchange Act, upon request,  to any seller of the Common Stock or Derivative
Securities,  the information concerning Tosco specified in Rule 144A(d)(4) under
the Securities Act, (so long as such requirement is necessary in order to permit
holders of the Common Stock or  Derivative  Securities  to effect  resales under
Rule 144A); and

               (iv) Tosco  shall not sell,  offer for sale or solicit  offers to
buy or  otherwise  negotiate  in  respect  of any  security  (as  defined in the
Securities  Act) which could be integrated  with the sale of the Common Stock or
any Derivative  Security in a manner which would require the registration of the
Common Stock or any Derivative Security under the Securities Act.

          (e) Standstill Provision.  Tosco shall not acquire any common stock of
              --------------------
Unocal Corporation,  a Delaware corporation and holder of all of the outstanding
stock of Union ("Unocal"), or securities convertible into common stock of Unocal
nor shall  Tosco  propose to Unocal or any Person  any  acquisition  transaction
(excluding  transactions  in  the  ordinary  course  of  business  of  the  type
previously  conducted by Union and Tosco)  between Unocal and Tosco and/or their
security holders  involving any of their respective  securities or assets unless
Union shall have requested in writing that Tosco make such a proposal.

          (f) Conflict with Articles or Bylaws. Tosco agrees that if any term or
              --------------------------------
provision of this  Agreement is  inconsistent  or in conflict with the terms and
provisions of its Articles of  Incorporation  or Bylaws,  as may be amended from
time to time,  Tosco  shall  abide by the terms and  provisions  hereof  and, if
necessary, to the extent within its control, cause the conflicting provisions in
the Articles or Bylaws to be amended accordingly.

                                       6
<PAGE>

     6.   Grant of Registration Rights.
          ----------------------------

          (a) Union is  entitled  to  demand  registration  of Common  Stock for
aggregate  proceeds of a minimum of $200  million  per  demand,  except if Union
possesses less than a $200 million value of Common Stock in which case Union may
demand registration of its remaining balance of Common Stock, but, in any event,
Union is entitled to not less than two demand registrations. Notwithstanding the
foregoing:

               (i) If Tosco shall furnish to Union,  upon Union's  request for a
demand registration,  a certificate signed by the Chairman of the Board of Tosco
stating that in the good faith  judgment of the Board of Directors,  it would be
seriously  detrimental  to an  equity  or debt  offering  by Tosco or any  other
corporate  transaction  by  Tosco,  in  either  case for  which  Tosco  had made
substantial  preparation  before  the date of receipt  of  Union's  request  for
registration pursuant to this Section and it is therefore essential to defer the
filing of such registration statement,  Tosco shall have the right to defer such
filing for the minimum  period of time  necessary to eliminate  the detriment to
Tosco,  provided  however that each such  deferral  shall not exceed a period of
more than  ninety  (90) days and all such  deferrals  in any  twelve  (12) month
period shall not exceed one hundred and twenty (120) days; and

               (ii) Tosco shall not be required to make a registration statement
effective  with the SEC  pursuant to a demand  registration  by Union within one
hundred  and  eighty  (180)  days  of the  effective  date  of the  registration
statement relating to a previous demand.

          (b) If Tosco  proposes to file any  registration  relating to a public
equity offering solely for cash, Tosco shall, at such time,  promptly give Union
written  notice of such  registration.  Upon the written  request of Union given
within twenty (20) days after mailing of such notice by Tosco, Tosco shall cause
to be registered under the Securities Act all of the Common Stock that Union has
requested to be registered  unless the registration  statement relates to a firm
commitment underwriting arrangement.  In that case, Tosco shall consult with the
managing  underwriters  and Union and shall use its best  efforts to include the
shares of Common Stock requested to be registered by Union.

     7. Mechanical Provisions.  (a) Whenever required to effect the registration
        ---------------------
of any Common Stock, Tosco shall:

               (i) Prepare and file with the SEC a  registration  statement,  as
expeditiously as reasonably  possible,  and in any case within twenty (20) days,
with  respect  to such  Common  Stock  and use its best  efforts  to cause  such
registration statement to become effective, and, upon the request of Union, keep
such registration  statement effective for up to ninety (90) days, unless in the
reasonable  opinion of counsel to Union,  some  longer  period is  necessary  to
effect the method of distribution  of the Common Stock or Derivative  Securities
selected by Union;

                                       7
<PAGE>

               (ii) Prepare and file with the SEC such amendments and
supplements to such registration statement and the prospectus used in connection
with  such  registration  statement  as may be  necessary  to  comply  with  the
provisions  of  the  Securities  Act  with  respect  to the  disposition  of all
securities covered by such registration statement;

               (iii)  Furnish to Union such  numbers of copies of a  prospectus,
including a preliminary  prospectus,  in conformity with the requirements of the
Securities Act, and such other documents as they may reasonably request in order
to facilitate the disposition of Common Stock owned by them;

               (iv) Use its best efforts to register and qualify the  securities
covered by such  registration  statement under such other securities or Blue Sky
laws of such jurisdictions as shall be reasonably  requested by Union,  provided
that Tosco  shall not be  required  in  connection  therewith  or as a condition
thereto to qualify to do business or,  except as required  under the  Securities
Act,  to file a general  consent to  service  of  process in any such  states or
jurisdictions;

               (v) In the event of any underwritten public offering,  enter into
and  perform  its  obligations  under an  underwriting  agreement,  in usual and
customary form including indemnity obligations, with the managing underwriter of
such  offering.  Union shall also enter into and perform its  obligations  under
such an agreement;

               (vi) Notify Union at any time when a prospectus  relating thereto
is required to be delivered  under the  Securities  Act of the  happening of any
event  as a  result  of  which  the  prospectus  included  in such  registration
statement, as then in effect, includes an untrue statement of a material fact or
omits to state a material  fact  required to be stated  therein or  necessary to
make the  statements  therein not  misleading in the light of the  circumstances
then existing;

               (vii) Cause all Common Stock registered  pursuant hereunder to be
listed  on each  securities  exchange  or  automated  quotation  system on which
similar securities issued by Tosco are then listed; and

               (viii) If the  method  of  distribution  selected  by Union is an
underwritten public offering,  and if the managing underwriter determines that a
roadshow would be beneficial to the success of the offering,  prepare a roadshow
presentation  and  make  those  executive  officers  selected  by  the  managing
underwriter  available  for meetings  with  investors  and analysts in locations
selected by the managing underwriter.

          (b) Union will make such information available to Tosco concerning the
76 Assets as is  necessary  in the opinion of counsel to Tosco to  complete  the
registration in compliance with the Securities Act.

                                       8
<PAGE>

     8. Indemnification;  Contribution. In the event the sale or distribution of
        ------------------------------
any shares of Common  Stock by Union are  included in a  registration  statement
filed by Tosco:

          (a) Tosco agrees to indemnify and hold harmless Union,  its directors,
officers  and each  person,  if any,  who  controls  Union within the meaning of
either  Section 15 of the  Securities Act or Section 20 of the Exchange Act from
and against  any and all losses,  claims,  damages and  liabilities  (including,
without limitation,  any legal or other expenses reasonably incurred by Union or
any such controlling  person in connection with defending or  investigating  any
such action or claim) caused by any untrue statement or alleged untrue statement
of a material  fact  contained in the  registration  statement or any  amendment
thereof,  any  preliminary  prospectus  or the final  prospectus  (as amended or
supplemented  if Tosco  shall  have  furnished  any  amendments  or  supplements
thereto),  or caused by any  omission  or alleged  omission  to state  therein a
material fact required to be stated  therein or necessary to make the statements
therein  not  misleading,  except  insofar as such  losses,  claims,  damages or
liabilities  are caused by any such  untrue  statement  or  omission  or alleged
untrue statement or omission based upon information  relating to Union furnished
to Tosco in writing by Union expressly for use therein.

          (b) Union agrees to indemnify and hold harmless Tosco,  its directors,
its officers who sign the  registration  statement and each person,  if any, who
controls  Tosco within the meaning of either Section 15 of the Securities Act or
Section 20 of the  Exchange  Act to the same extent as the  foregoing  indemnity
from Tosco to Union,  but only with reference to  information  relating to Union
furnished  to Tosco in writing by Union  expressly  for use in the  registration
statement  (including any preliminary  prospectus,  the final  prospectus or any
amendments or supplements thereto).

          (c) In case any proceeding (including any governmental  investigation)
shall be instituted  involving  any person in respect of which  indemnity may be
sought  pursuant to either  paragraph  (a) or (b) of this Section 8, such person
(the  "indemnified  party") shall  promptly  notify the person against whom such
indemnity  may  be  sought  (the  "indemnifying   party")  in  writing  and  the
indemnifying  party, upon request of the indemnified party, shall retain counsel
reasonably  satisfactory to the  indemnified  party to represent the indemnified
party and any others the indemnifying party may designate in such proceeding and
shall pay the fees and disbursements of such counsel related to such proceeding.
In any such proceeding, any indemnified party shall have the right to retain its
own counsel,  but the fees and expenses of such counsel  shall be at the expense
of such indemnified party unless (i) the indemnifying  party and the indemnified
party shall have  mutually  agreed to the  retention of such counsel or (ii) the
named parties to any such proceeding  (including any impleaded  parties) include
both the indemnifying party and the indemnified party and representation of both
parties by the same counsel  would be  inappropriate  due to actual or potential
differing  interests between them. It is understood that the indemnifying  party
shall  not,  in  respect  of the  legal  expenses  of any  indemnified  party in
connection with any proceeding or related  proceedings in the same jurisdiction,
be liable for the fees and expenses of more than one separate  firm (in addition
to any local  counsel) for all such  indemnified  parties and that all such fees

                                       9
<PAGE>

and  expenses  shall be  reimbursed  as they are  incurred.  Such firm  shall be
designated in writing by Union, in the case of parties  indemnified  pursuant to
paragraph (a) above, and by Tosco in the case of parties indemnified pursuant to
paragraph  (b)  above.  The  indemnifying  party  shall  not be  liable  for any
settlement  of any  proceeding  effected  without  its written  consent,  but if
settled with such consent or if there is a final judgment for the plaintiff, the
indemnifying  party agrees to indemnify the  indemnified  party from and against
any loss or liability by reason of such settlement or judgment.  Notwithstanding
the foregoing sentence, if at any time an indemnified party shall have requested
an indemnifying  party to reimburse the indemnified  party for fees and expenses
of counsel as  contemplated by the second and third sentences of this paragraph,
the indemnifying  party agrees that it shall be liable for any settlement of any
proceeding  effected  without  its  written  consent if (i) such  settlement  is
entered into more than 30 days after receipt by such  indemnifying  party of the
aforesaid request and (ii) such indemnifying party shall not have reimbursed the
indemnified  party in  accordance  with such  request  prior to the date of such
settlement.  No indemnifying  party shall,  without the prior written consent of
the  indemnified  party,  effect any  settlement  of any  pending or  threatened
proceeding  in  respect of which any  indemnified  party is or could have been a
party and indemnity could have been sought hereunder by such indemnified  party,
unless such settlement  includes an  unconditional  release of such  indemnified
party  from  all  liability  on  claims  that  are the  subject  matter  of such
proceeding.

          (d) To the extent the indemnification provided for in paragraph (a) or
(b) of this Section 8 is unavailable to an indemnified  party or insufficient in
respect of any losses,  claims, damages or liabilities referred to therein, then
each  indemnifying  party under such  paragraph,  in lieu of  indemnifying  such
indemnified party thereunder,  shall contribute to the amount paid or payable by
such  indemnified  party  as  a  result  of  such  losses,  claims,  damages  or
liabilities  in such  proportion as is appropriate to reflect the relative fault
of Tosco on the one hand and of Union on the other hand in  connection  with the
statements  or  omissions  that  resulted  in such  losses,  claims,  damages or
liabilities,  as  well  as any  other  relevant  equitable  considerations.  The
relative  fault of Tosco on the one hand and  Union on the other  hand  shall be
determined by reference  to, among other  things,  whether the untrue or alleged
untrue statement of a material fact or the omission or alleged omission to state
a material  fact  relates to  information  supplied by Tosco or by Union and the
parties'  relative intent,  knowledge,  access to information and opportunity to
correct or prevent such statement or omission.

          (e) The  obligations  of Tosco  and Union  under  this  Section  shall
survive  the  completion  of any  offering  of  Common  Stock in a  registration
statement under this Section, and otherwise.


     9.  Underwriting  Expenses.  Union  shall  bear  and pay  all  third-party,
         ----------------------
out-of-pocket  costs  of the  underwriting  incurred  by  Tosco in the case of a
registration  statement  filed  pursuant  to Section  6(a),  if those  costs are
incurred in the same manner as Tosco would incur in an underwritten  transaction
on  its  own  behalf.  Tosco  shall  be  responsible  for  the  expenses  of the

                                       10
<PAGE>

underwriting  in the case of a registration  statement filed pursuant to Section
6(b) other than those additional  expenses (such as the additional  registration
fee) that are incurred as a result of the inclusion of Common Stock.  In advance
of filing a  registration  statement  pursuant to Section 6(a),  however,  Tosco
shall  present a good faith  estimate  to Union and shall  meet and confer  with
Union  regarding  the  expenses  to be  incurred.  In all cases,  Union shall be
responsible  for the  underwriting  discount and  commission on the Common Stock
sold by Union.

     10.  Termination.
          -----------

          (a) The  Agreement  shall  terminate  and be of no  further  force and
effect as to each particular  share of Common Stock, and the legend specified in
Section  3(c)(ii) shall be removed from any  certificate  evidencing such share,
immediately upon the earliest to occur of the following events:  (i) the sale or
transfer by Union of such Common Stock to any Person or Persons, other than to a
Person that is an Affiliate of Union or (ii) January 15, 2007;

          (b) The  Agreement  shall  terminate  and be of no  further  force and
effect  as to Union  immediately  upon the  earliest  to occur of the  following
events:  (i) the sale or transfer by Union of that amount of Common  Stock which
causes  Union to own less than 5% of the  outstanding  shares of Common Stock or
(ii) January 15, 2007;

          (c)  Upon  Termination  of this  Agreement  as to  Union  or as to any
particular  share of Common Stock,  the legends  defined in Section 3(c) of this
Agreement shall be removed from those shares which are no longer subject to this
Agreement;

          (d)  Notwithstanding the provisions of Section 10(a) or (b) above, the
registration  rights granted in Section 6 of this Agreement shall terminate when
all of the Common Stock could be sold under Rule 144 (or successor rule) without
any volume limitations.

     11.  Agreement to Perform  Necessary Acts. Union and Tosco shall do any and
          ------------------------------------
all things,  take any and all actions,  perform any further acts and execute and
deliver any further  documents that may be reasonably  necessary,  whether under
any applicable law, the Articles and Bylaws of Tosco or otherwise,  to carry out
and effectuate the provisions of this Agreement;

     12.  Governing Law. This Agreement shall be governed by and construed under
          -------------
the laws of the State of New York.

     13.  Integration.  This  Agreement  constitutes  the entire  agreement  and
          -----------
understanding  of Tosco and Union  with  respect to the  subject  matter of this
Agreement and supersedes all prior  agreements and  understandings  with respect
thereto.

                                       11
<PAGE>


     14.   Counterparts.   This  Agreement  may  be  executed  in  two  or  more
           ------------
counterparts,  each of  which  shall be  deemed  an  original,  but all of which
together shall constitute one and the same instrument.

     15. Titles and  Subtitles.  The titles and subtitles used in this Agreement
         ---------------------
are used for  convenience  only and are not to be  considered  in  construing or
interpreting this Agreement.

     16.  Notices.  Unless  otherwise  provided  herein,  any notice required or
          -------
permitted  under this  Agreement  shall be given in writing or by facsimile  and
shall,  subject to the provisos set forth below, be deemed effectively given (i)
upon personal  delivery to the party to be notified at the address indicated for
such party on the signature page hereof,  (ii) on the next Business Day after it
is deposited with a recognized overnight courier service servicing the locale of
the addressee,  designated for overnight delivery,  prepaid and addressed to the
party to be notified at the address  indicated  for such party on the  signature
page hereof,  or (iii) upon  transmission to such party at its facsimile  number
indicated  for  such  party  on  the  signature  page  hereof  (with  electronic
acknowledgment  of  receipt  and a copy  thereof  sent by  overnight  courier in
accordance  with clause (ii)  above);  provided,  however,  that any such notice
shall be sent to such  other  address  or  facsimile  number  as such  party may
designate by ten (10) days' advance notice to the other party.

     17. Enforcement Expenses. If any action at law or in equity is necessary to
         --------------------
enforce or interpret the terms of this Agreement,  the prevailing party shall be
entitled to reasonable  attorneys'  fees,  costs and necessary  disbursements in
addition to any other relief to which such party may be entitled.

     18. Amendments and Waivers. Except as expressly provided in this Agreement,
         ----------------------
neither this Agreement nor any term hereof may be amended, waived, discharged or
terminated  other than upon the written consent of all of (i) Tosco and (ii) the
holders of at least a majority  of the Common  Stock.  Any  amendment  or waiver
effected in accordance  with this paragraph shall be binding upon each holder of
Common Stock and Tosco. In the event that an  underwriting  agreement is entered
into  between  Tosco  and any  holder  of Common  Stock,  and such  underwriting
agreement  contains  terms  differing from this Agreement as to any such holder,
the terms of such underwriting agreement shall govern.

     19. No  Reliance  on Other  Parties.  Each  party  hereto  has  voluntarily
         -------------------------------
undertaken its  obligations to the other parties hereto under this Agreement and
each of the other  contracts  and  instruments  referred  to herein.  Each party
hereto represents and warrants that it has reviewed and understands each of this
Agreement and such other documents and has discussed each such document with its
legal counsel (and other advisors,  if any) so that such party is satisfied that
it is aware of its risks and the significance of each such document.  Each party
acknowledges  and  agrees  that  it is  not  relying  upon  any  representation,
warranty,  understanding  or  obligation  of any other party  hereto that is not
expressly stated in this Agreement or any other contract or instrument  referred
to herein.

                                       12
<PAGE>


     20.  Severability.  If one or more provisions of this Agreement are held to
          ------------
be  unenforceable  under  applicable  law, such provision shall be excluded from
this Agreement and the balance of the Agreement  shall be interpreted as if such
provision  were so excluded  and shall be  enforceable  in  accordance  with its
terms.

     21.  Business  Days.  If any date set forth  herein as the final  date (for
          --------------
purposes of payment, notice or otherwise) is not a Business Day, then such final
date  shall be deemed to be the next  succeeding  Business  Day.  Time is of the
essence under this Agreement.




<PAGE>


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


                             TOSCO CORPORATION
                             a Nevada corporation


                             By
                                  ---------------------------------
                                  Name:
                                  Title:

                             Address for Notices:

                             Tosco Corporation
                             72 Cummings Point Road
                             Stamford, Connecticut 06902

                             Attn:  Wilkes McClave III, Esq.
                                    General Counsel
                                    (203) 977-1005 (Phone)
                                    (203) 964-3187 (Fax)

                             UNION OIL COMPANY OF CALIFORNIA
                             a California corporation


                             By
                                  --------------------------------
                                  Name:
                                  Title:

                             Address for Notices:

                             UNOCAL Corporation
                             2141 Rosecrans Avenue, Suite 4000
                             El Segundo, California 90245

                             Attn:  Neal E. Schmale
                                    Chief Financial Officer
                                    (310) 726-7621 (Phone)
                                    (310) 726-7806 (Fax)

                             cc:    Dennis P.R. Codon, Esq.
                                    General Counsel
                                    (310) 726-7651 (Phone)
                                    (310) 726-7815 (Fax)

<PAGE>


                         SUPPLEMENT NO. 1 TO

              STOCK PURCHASE AND SHAREHOLDER AGREEMENT


          Tosco  Corporation  hereby  elects  that the $45 per share  limitation
contained in the  definition  of Market Price set forth in Section 1, on page 2,
of the Stock Purchase and Shareholder Agreement dated January 15, 1997 shall not
apply.

          IN WITNESS WHEREOF, Tosco Corporation has executed this as of the 15th
day of January, 1997.


                             TOSCO CORPORATION
                             a Nevada corporation


                             By
                                 ---------------------------------
                                 Name:
                                 Title:





                                                                    EXHIBIT 2.3

                                                                   
                                 ATTACHMENT XXII

                                   ----------


                             ENVIRONMENTAL AGREEMENT


                                 By and Between


                         UNION OIL COMPANY OF CALIFORNIA


                                       and


                                TOSCO CORPORATION



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

                           Dated as of [Closing Date]
                          ----------------------------






<PAGE>



                             ENVIRONMENTAL AGREEMENT



         THIS   ENVIRONMENTAL   AGREEMENT   is  dated  as  of   [Closing   Date]
("Agreement"), between UNION OIL COMPANY OF CALIFORNIA, a California corporation
and TOSCO CORPORATION, a Nevada Corporation.

                                    RECITALS

                 WHEREAS,  Seller and  Purchaser  have  entered  into a Sale and
Purchase  Agreement For 76 Products  Company dated  December 14, 1996 ("Sale and
Purchase  Agreement"),  pursuant  to which  Purchaser  agreed to buy and  Seller
agreed to sell the business and assets that  constitute the 76 Products  Company
business segment of Seller; and

                 WHEREAS,  the Sale and Purchase  Agreement provides that Seller
and Purchaser  will enter into an  Environmental  Agreement at Closing to be the
exclusive statement of the representations,  warranties,  covenants,  agreements
and  indemnities  with  respect  to  Environmental  Laws as they apply to the 76
Products Company business segment.

                 NOW, THEREFORE, the parties agree as follows:

     1.  Definitions.  For all purposes of this  Agreement,  the following terms
shall have the following meanings, and such meanings shall be equally applied to
both the singular and plural forms of the terms defined.


     (a) "Allocated  Overhead Costs" shall have the meaning specified in Section
1(n).

     (b)  "Baseline"  shall mean all  Releases  in or to the  atmosphere,  soil,
surface  water,  subsurface  strata or groundwater at or from the 76 Assets that
occurred prior to the Closing and shall include  Releases,  whenever  occurring,
resulting from Hazardous  Materials sent prior to Closing from the 76 Assets, as
they are  comprised on the Closing  Date,  to a disposal  site  designated  as a
"Superfund" site under the Comprehensive  Environmental  Response,  Compensation
and Liability Act.

     (c)  "Baseline  Amortizing  Amount"  shall have the  meaning  specified  in
Section 4(a).

     (d) "Baseline  Corrective Action Costs" shall have the meaning specified in
Section 4(a).

     (e)  "Baseline  Corrective  Action Costs  Quarterly  Report" shall have the
meaning specified in Section 5(b)(ii).

                                       1
<PAGE>


     (f)  "Baseline  Development  Period"  shall have the meaning  specified  in
Section 4(b).

     (g)  "Category  I Project"  shall  have the  meaning  specified  in Section
5(c)(i).

     (h)  "Category  II  Projects"  shall have the meaning  specified in Section
5(c)(i).

     (i) "Change Event" shall have the meaning specified in Section 4(a).

     (j) "Claim Notice" shall have the meaning specified in Section 8(c).

     (k) "Closing" shall mean the date and time that the 76 Assets are purchased
by Purchaser under the Sale and Purchase Agreement.

                 (l) "Compliance  Action" shall mean any expenditure or activity
necessary to operate the 76 Assets in compliance with  applicable  Environmental
Laws.

     (m) "Compliance  Action Costs" shall have the meaning  specified in Section
4(c).

     (n)  "Corrective  Action"  shall mean any  expenditure  or  activity  taken
pursuant to Environmental Laws to investigate,  monitor and, if required, abate,
clean up,  remove,  treat,  cover or in any other way  remediate a Release at or
from the 76  Assets,  including  reasonably  incurred  removal,  remediation  or
cleanup costs, site investigation and assessment costs, government oversight and
response  costs  and,  if  applicable,  allocated  costs of  in-house  personnel
necessary to directly  manage or support such  activities  ("Allocated  Overhead
Costs"),  but excluding any allocation of general corporate overhead;  provided,
however,  such  allocated  costs shall not exceed ten percent  (10%) of Baseline
Corrective  Action  Costs.  Corrective  Action  shall also mean any payment of a
third  party's  (including,  but not  limited  to, any  federal,  state or local
government  agency)  claim  for  property  damages,  losses,  expenses,   costs,
deficiencies,   penalties,  liens,  interests,   fines,  assessments,   charges,
obligations or liabilities of any kind, including reasonable attorneys' fees and
court  costs,  arising out of or relating to a Release at or from the 76 Assets;
provided,  however,  Corrective  Action  shall not  include  Compliance  Action,
Retained Environmental Liability,  payment of a third party's claim for personal
injury  (including,  but not  limited  to,  any claim for a  person's  physical,
mental,  psychological,  chemical or  biological  response to the  exposure to a
Hazardous Substance) or punitive damages.

     (o)  "Corrective  Action Plan" shall have the meaning  specified in Section
5(b)(i).

     (p)  "Environmental  Laws"  shall mean any legal  requirement  relating  to
pollution,  protection or cleanup of the environment (including, but not limited
to, ambient air, surface water, groundwater, land surface or subsurface strata),
including,   without  limitation,  the  Comprehensive   Environmental  Response,
Compensation and

                                       2
<PAGE>
         
          
Liability Act of 1980, as amended,  the Resources  Conservation and Recovery Act
of 1976, as amended, and any other federal,  state and local legal requirements,
as such  legal  requirements  exist on the  Closing  Date  (except as such legal
requirements   may  be  amended  after  the  Closing  Date  to  modify  existing
remediation standards), relating to: (i) a Release or the containment,  removal,
remediation,  response,  cleanup or abatement of a Hazardous Substance; (ii) the
manufacture,   generation,  formulation,   processing,  labeling,  distribution,
introduction into commerce, use, treatment, handling, storage, or transportation
of a Hazardous Substance;  (iii) exposure of persons,  including employees, to a
Hazardous  Substance;  (iv) occupational  safety or health matters;  and (v) the
physical  structure  or  condition  of a  building,  facility,  fixture or other
structure, including, without limitation, those relating to the management, use,
storage,   disposal,   cleanup  or  removal  of  asbestos,   asbestos-containing
materials, polychlorinated biphenyls or any other Hazardous Substance.

     (q)  "Hazardous  Substance"  shall  mean  any  toxic  substance  or  waste,
pollutant, hazardous substance or waste, contaminant,  special waste, industrial
substance or waste,  petroleum or  petroleum-derived  substance or waste, or any
toxic or  hazardous  constituent  of any such  substance  or  waste,  including,
without  limitation,  any substance  regulated under or defined by Environmental
Laws.

     (r)   "Improvements"   shall  mean  the  permanent   structures  and  other
improvements on the Real Property acquired by Purchaser pursuant to the Sale and
Purchase Agreement.

     (s) "Indemnified Party" and "Indemnifying  Party" shall have the respective
meanings specified in Section 8(c).

     (t) "Independent  Consultant"  shall have the meaning  specified in Section
10(b).

     (u)  "Permit"  shall  mean  any  approval,   registration,   authorization,
certificate, certificate of occupancy, consent, license, order, permit, variance
or  other  similar   authorization   of  any  government   agency   required  by
Environmental  Laws in  effect  on or  prior  to the  Closing  for  the  current
ownership, use or operation of the 76 Assets.

     (v)  "Purchaser"  shall  mean  Tosco  Corporation  and  its  successors  in
interest.

     (w) "Real  Property"  shall mean the real  property  acquired by  Purchaser
pursuant to the Sale and Purchase Agreement.

     (x) "Release" shall mean any spilling, leaking, pumping, pouring, emitting,
emptying,  discharging,  escaping, leaching, dumping or disposing of a Hazardous
Substance  into the  environment  of any  kind  whatsoever,  including,  but not
limited to, the abandonment or discarding of barrels, containers, tanks or other
receptacles containing or previously containing a Hazardous Substance. Migration
of any pre-Closing Release shall not be considered a new Release for purposes of
this Environmental Agreement.

                                       3
<PAGE>


     (y)  "Remediation  Equipment"  shall have the meaning  specified in Section
7(d).

     (z)  "Reportable  Quantity of a Hazardous  Substance"  shall mean a Release
which  is  required,  pursuant  to  Environmental  Laws,  to  be  reported  to a
government agency.

     (aa) "Retail Site" shall mean Real Property and  Improvements  used for the
retail sale of motor fuel to the general public.

     (bb) "Retained Environmental Liability" shall mean any liability imposed by
Environmental  Laws arising out of Seller's  pre-Closing  activities  other than
activities  associated with the 76 Assets,  and shall also include any liability
for  any  designated   "Superfund"  site  as  of  the  Closing  Date  under  the
Comprehensive  Environmental Response,  Compensation and Liability Act for which
Seller has been named a "Potentially  Responsible Party" as of the Closing Date.
Retained  Environmental   Liability  shall  not  include  Compliance  Action  or
Corrective Action.

     (ac) "Sale and Purchase  Agreement" shall have the meaning specified in the
first recital of this Agreement.

     (ad) "Seller" shall mean Union Oil Company of California and its successors
in interest.

     (ae) "Special Damages" shall have the meaning specified in Section 7(d).

     (af) "UST Funds" shall have the meaning specified in Section 9(a).

     (ag) "76  Assets"  shall mean the  business  and assets of the 76  Products
Company  business  segment of Seller acquired by Purchaser  pursuant to the Sale
and Purchase Agreement.

     (ah) "$200 Million Cap" shall have the meaning specified in Section 4(a).


     2. SELLER'S ENVIRONMENTAL REPRESENTATIONS.  To Seller's knowledge, Schedule
2A sets  forth an  accurate  and  complete  list of all  Permits  Seller has for
operation of the 76 Assets pursuant to applicable Environmental Laws. Except for
the items set forth in  Schedule 2B to this  Agreement,  to the best of Seller's
knowledge as of the Closing:

                 (a) All Permits  necessary  for the operation of the 76 Assets,
as they are currently  being  operated by Seller,  have been obtained and are in
effect and, where  required,  applications  for renewal thereof have been timely
filed,  except where the failure to obtain such Permits,  individually or in the
aggregate, would not have a significant adverse effect upon the operation of the
76 Assets as they have been operated on a historical basis.

                                       4
<PAGE>


                 (b)  The  76  Assets   are  in   compliance   with   applicable
Environmental  Laws  and  Permits,  except  where  the  failure  to be  in  such
compliance would not have a significant  adverse effect on the operations of the
76 Assets as they have been operated on a historical basis.

     3. PURCHASER'S ENVIRONMENTAL  REPRESENTATIONS AFTER DUE DILIGENCE. Based on
Purchaser's  inquiry  and  due  diligence  prior  to the  Closing,  none  of the
representations made above by Seller is inaccurate.

     4. ENVIRONMENTAL PROVISIONS.

                 (a) ALLOCATION OF BASELINE  CORRECTIVE ACTION COSTS.  Except as
otherwise  provided in this Agreement,  Seller shall be responsible for Retained
Environmental  Liability  and the cost of  Corrective  Action  arising out of or
related to the Baseline  ("Baseline  Corrective  Action  Costs"),  and Purchaser
shall be responsible for all other Corrective Action;  provided,  however,  that
Seller's   obligation  for  Baseline   Corrective   Action  Costs  shall  expire
twenty-five  (25)  years  after the  Closing,  except as to  unpaid  amounts  of
Baseline  Corrective Action Costs invoiced to Seller for work performed prior to
such  expiration  and except  Baseline  Corrective  Action  Costs for a discrete
project begun prior to such  expiration and to be completed  within a reasonable
and definite time period (but  excluding  costs  associated  with  monitoring of
environmental  conditions  and other ongoing  non-remediation  costs).  Baseline
Corrective  Action  Costs  shall  include  costs  incurred  to  prevent or abate
migration  of a  pre-Closing  Release at or from a 76 Assets to  adjoining  real
property owned, leased or used by a third party.  Notwithstanding the foregoing,
Purchaser shall pay, during each calendar year, the first $7 million of Baseline
Corrective  Action  Costs  and forty  percent  (40%) of the  amount of  Baseline
Corrective Action Costs (and Seller shall pay the remaining sixty percent (60%))
in excess of the $7 million,  up to a lifetime  aggregate of $200 million ("$200
Million Cap"). Upon and after the occurrence of a Change Event,  Seller shall be
charged annually with its allocated share of the Baseline  Amortizing  Amount in
accordance with the allocation of responsibility for Baseline  Corrective Action
Costs  provided in this Section 4(a).  Purchaser  shall be  responsible  for all
Corrective Action costs in excess of the Baseline  Amortizing  Amount,  and such
costs shall not be included in the  calculation  of the $200 Million  Cap.  Only
Purchaser's  allocated share of the Baseline Amortizing Amount shall be included
in the calculation of the $200 Million Cap.  "Baseline  Amortizing Amount" means
the annual Baseline  Corrective Action Costs with respect to a facility at which
a Change Event has occurred, estimated in good faith using the Corrective Action
Plan as a  guideline  and  assuming  that such  Change  Event had not  occurred.
"Change  Event"  means:  (i) the closure of a 76 Asset site (other than a Retail
Site); and/or (ii) the change in use of a 76 Asset (other than a Retail Site) to
a use outside the  petroleum/chemical  industry.  For purposes of this  Section,
closure means the  termination of  substantially  all operations at a site which
results in an acceleration of or additional Baseline Corrective Action from what
is otherwise set forth in the Corrective  Action Plan prior to the contemplation
of closure of such site,  or if no such  Corrective  Action Plan exists prior to
such contemplation, Seller's existing plans for such site.

                                       5
<PAGE>


                 (b) BASELINE DETERMINATION. The Baseline shall be determined by
reference to existing  information from studies performed by or for Seller, such
as described in Seller's existing  Environmental  Remediation  Services Business
Plans for Real Property and  Improvements.  Within six (6) months of the Closing
("Baseline  Development  Period"),  the  Baseline  can be  augmented  by further
investigation that Purchaser determines in good faith is reasonably necessary to
establish the Baseline. Such further investigation shall be performed during the
Baseline  Development  Period (or if Seller in its sole  discretion  agrees to a
longer  period than six (6) months,  during the period as Seller  agrees).  Such
further  investigation  shall be performed at Purchaser's sole expense and shall
not be included in  calculation  of the $200 Million Cap.  Purchaser may further
augment the Baseline after the six (6)-month  period with in situ testing of the
76 Assets that Purchaser,  during the Baseline Development Period, identifies is
reasonably  necessary  to  establish  that a Release  should be  included in the
Baseline, but only to the extent such testing is required by a lawful order of a
government  agency (with  jurisdiction)  to conduct such testing on such site or
Seller agrees such testing is required under  Environmental Laws (such agreement
not to be unreasonably withheld).

                 (c) COMPLIANCE  ACTION COSTS.  Except as otherwise  provided in
this Section 4(c), Seller shall be responsible for the cost of Compliance Action
("Compliance  Action  Costs")  which arise out of or result from  operations  or
conditions  before the Closing.  Purchaser  shall be responsible  for Compliance
Action Costs which arise out of or result from  operations or  conditions  after
the Closing.  Notwithstanding the foregoing,  Purchaser shall be responsible for
Compliance  Action  Costs  associated  with the  construction  and  operation of
facilities  necessary to achieve selenium  effluent  limitations at Seller's San
Francisco  Refinery  and  the  construction  and  operation  of  vapor  recovery
equipment at Seller's Los Angeles  Refinery  Marine Terminal to: (i) comply with
Environmental Laws; or (ii) as may be required in connection with the renewal of
Seller's existing lease for the Terminal.

     5. CONDUCT OF BASELINE CORRECTIVE ACTION.

     (a) If Baseline Corrective Action is required,  Purchaser shall conduct and
pay for such action,  and Seller shall  reimburse  Purchaser in accordance  with
Section  4(a).  During the time Seller is obligated to pay all or any portion of
Baseline Corrective Action Costs, Purchaser shall, within twenty-four (24) hours
after  reporting to the  appropriate  government  agency,  notify  Seller of any
Reportable  Quantity of a Hazardous  Substance.  If a  Reportable  Quantity of a
Hazardous Substance is discovered in the soil, surface water,  subsurface strata
or  groundwater  at a 76 Asset  after  the  Closing  in an  amount  not  readily
distinguishable  from  the  Baseline,  Purchaser  shall be  responsible  for the
incremental  Corrective Action costs associated therewith,  and such costs shall
not be included in the  calculation  of the $200  million cap.  Purchaser  shall
provide to Seller  information  about such an event  sufficient  to estimate the
incremental  Corrective Action costs attributable thereto.  Purchaser and Seller
shall work  together in good faith to agree on such  incremental  costs.  In the
event the parties are unable to reach agreement on such  incremental  costs, the
dispute may be submitted for dispute resolution in accordance with Section 10.


                                       6
<PAGE>

     (b) Purchaser shall provide to Seller the following reports and information
in  conjunction  with  Baseline  Corrective  Action  conducted  or planned to be
conducted by Purchaser:

     (i) By September 30 of each calendar year during which  Purchaser  conducts
Baseline  Corrective Action,  Purchaser shall provide Seller with an expenditure
plan detailing its planned Baseline  Corrective Action  expenditures for each of
the next three (3) calendar years  ("Corrective  Action  Plan").  The Corrective
Action  Plan  shall  include   separate  detail   supporting  any  project  with
anticipated  expenditures during the three (3)-year period in excess of $250,000
("Category  I  Project")  and  a  summary  total  of  all  other  projects  with
anticipated  expenditures during the three (3)-year period of less than $250,000
("Category II Projects").

     (ii)  Within  thirty  (30)  days  after the end of each  calendar  quarter,
Purchaser  shall provide Seller with a status report of all Baseline  Corrective
Action Costs Purchaser has incurred  year-to-date  ("Baseline  Corrective Action
Costs Quarterly Report").  The Baseline Corrective Action Costs Quarterly Report
shall  provide a summary of the total  expenditures  incurred  for the  previous
quarter, year-to-date and life-to-date for each Category I Project identified in
the Corrective Action Plan and a summary of the total expenditures  incurred for
the  previous  quarter,  year-to-date  and  life-to-date  for  the  Category  II
Projects.  The expenditures  reported shall segregate Baseline Corrective Action
Costs with a breakdown  within each category  between direct costs and Allocated
Overhead Costs,  and a summary of the amount of all Baseline  Corrective  Action
Costs Purchaser contends should be included in calculating the $200 Million Cap.
The  Baseline  Corrective  Action Costs  Quarterly  Report for each of the first
three quarters of the year shall include an update to the estimated expenditures
for each  Category I Project and for all Category II Projects for the balance of
the current year. The Baseline  Corrective Action Costs Quarterly Report for the
fourth  quarter  shall include an update for the  following  year (i.e.  the 4th
quarter Baseline  Corrective Action Costs Quarterly Report of 1997 will estimate
expenditures  for each  Category I Project and the  Category II Projects for the
calendar year 1998). The Baseline Corrective Action Costs Quarterly Report shall
include an invoice to Seller for Seller's  share of Baseline  Corrective  Action
Costs.  Purchaser  shall  provide  Seller  with  any  documentation   reasonably
requested by Seller that evidences the invoiced amounts.

     (c) Seller shall  reimburse  Purchaser  for Seller's  share of the invoiced
Baseline  Corrective Action Costs within thirty (30) days of Seller's receipt of
such  invoice or,  within  such time,  notify  Purchaser  in writing of disputed
invoiced  amounts and withhold  payment of those amounts.  Only disputed amounts
may be withheld.

     (d) Seller shall have the right, upon reasonable notice, to
audit the Baseline  Corrective Action Costs Quarterly  Reports.  Any adjustments
identified by Seller  through an audit will be presented to Purchaser in writing
for  consideration  to revise the Baseline  Corrective  Action  Costs  Quarterly
Reports and  associated  invoices.  Purchaser and Seller shall  together  review
Seller's  proposed  adjustments  and  negotiate  in good faith to resolve  those
adjustments.  If an  agreement  cannot be reached  within sixty (60) days of the

                                       7
<PAGE>

presentment  of the proposed  adjustments,  the  unresolved  adjustments  may be
submitted for dispute resolution in accordance with Section 10.

     (e) Upon Seller's reasonable request, Purchaser shall provide Seller with a
copy of any information relating to Baseline Corrective Action,  including,  but
not limited to, soil assessment data,  laboratory reports,  field study results,
groundwater   monitoring  data,  and  operating  and  maintenance  histories  of
groundwater  recovery  equipment  operated  by  Purchaser  relating  to Baseline
Corrective Action.

     (f)  Seller  shall  have  the  right,  but not the  obligation,  to  notify
Purchaser  in  writing  within  thirty  (30)  days of  Seller's  receipt  of the
Corrective Action Plan of Seller's intent to participate  directly in government
agency contacts and the development of a site assessment or remediation  plan or
project for any Category I Project.  Except in each case to the extent Purchaser
is required to take action pursuant to Environmental  Laws before such agreement
can be reached,  Purchaser  and Seller shall reach  agreement on  communications
with the government  agency and the scope of the plan or project,  and Purchaser
shall  not agree to a site  assessment  or  remediation  plan  without  Seller's
consent.

     (g) If Purchaser's  share of Baseline  Corrective  Action Costs reaches the
$200 Million Cap, Seller shall have the right, but not the obligation, to assume
control over all further Baseline  Corrective  Action, the cost for which Seller
is responsible  under this  Agreement,  upon giving  Purchaser  ninety (90) days
prior written notice.  Within a reasonable period of time following such notice,
Purchaser and Seller shall agree upon an orderly transition of control over such
Baseline  Corrective  Action,  including,  but not limited to,  compensation for
equipment  previously used by Purchaser in connection  with Baseline  Corrective
Action.

     6. CASHOUT OF CERTAIN BASELINE CORRECTIVE ACTION OBLIGATIONS.  Seller shall
have the option to extinguish its share of Baseline  Corrective Action Costs for
a 76 Asset in exchange for an agreed lump-sum payment to Purchaser upon the sale
of a 76 Asset owned by Purchaser.  Designation  of such a 76 Asset shall be made
by written  notice to Purchaser.  Purchaser  and Seller shall  negotiate in good
faith in an attempt to agree on the appropriate  lump-sum payment.  In the event
the parties are unable to agree on the lump-sum  payment,  Seller shall have the
option to submit the matter for dispute  resolution in  accordance  with Section
10.  Upon  payment of the agreed  upon  amount or the amount  determined  by the
Independent Consultant to be appropriate,  Seller shall be released by Purchaser
from any further  environmental  obligation with respect to Baseline  Corrective
Action for such a 76 Asset and shall be entitled to indemnification by Purchaser
pursuant to section 8(b)(vi).  Only Purchaser's share of the projected  Baseline
Corrective  Action  Costs used in  determining  the  lump-sum  payment  shall be
included  at that  time in  calculating  the  $200  Million  Cap and  shall  not
otherwise  be included in  calculating  the  allocation  of Baseline  Corrective
Action Costs pursuant to Section 4(a).


                                       8
<PAGE>

     7. ACCESS.

     (a) Upon reasonable  notice,  Purchaser  shall permit,  under the following
conditions  specified  in this  Section,  access to and entry upon a 76 Asset to
Seller  and  Seller's  independent  contractors  as  necessary:  (i) to  conduct
Baseline  Corrective  Action, if Seller elects to assume control of such action;
and (ii) to observe and monitor Baseline Corrective Action.

     (b) If Seller assumes control of Baseline Corrective Action,  except in the
event of an  emergency,  Seller shall provide  Purchaser  with at least five (5)
business days notice prior to  commencement  of any drilling,  construction,  or
equipment  installation,  and any other activity that may  unreasonably  disrupt
normal business operations at a 76 Asset. If any such activity will likely cause
an unreasonable disruption, Seller shall reschedule the activity to a reasonable
mutually  convenient time in order to minimize the  disruption.  Purchaser shall
not  unreasonably  interfere  with Seller while Seller  exercises  its rights of
ingress  and egress to conduct  Baseline  Corrective  Action.  Seller  shall use
reasonable  efforts  to conduct  Baseline  Corrective  Action in a manner  which
minimizes disruption to the business activities at a 76 Asset. Seller shall take
steps  reasonably  necessary to prevent  injury to persons or damage to property
resulting from or in any way connected with such Baseline  Corrective  Action it
conducts, including adherence to Purchaser's safety rules and procedures.

     (c)  Within a  reasonable  period  of time  after  completion  of  Baseline
Corrective Action at a 76 Asset where Seller has assumed control of such action,
Seller shall restore such 76 Asset to substantially  the condition which existed
immediately  prior to Seller's  commencement of Baseline  Corrective  Action. No
claim for special,  exemplary,  consequential or indirect  damages,  or for lost
profits,  shall be asserted  by  Purchaser  against  Seller in  connection  with
Baseline  Corrective  Action performed by an independent  contractor.  Purchaser
shall  have the right to pursue  such  damage  claims  against  the  independent
contractor. No contractor, subcontractor,  materialman, agent, officer, director
or employee of Seller  shall have any right to a lien  against a 76 Asset or any
part  thereof  for any work,  labor or  materials  furnished  to Seller  for the
actions performed thereon, unless otherwise required by applicable law.

     (d)  Purchaser  shall  reimburse  Seller for all  damages,  losses,  costs,
penalties,  fines and assessments  which Seller incurs if reasonable access to a
76 Asset is not granted to Seller in accordance with this  Agreement.  Purchaser
shall reimburse  Seller for any  out-of-pocket  damages in excess of $1,000 that
Purchaser  and its  employees,  agents,  lessees,  occupants  of a 76  Asset  or
contractors  cause,  as a  result  of  injury  to any test or  monitoring  well,
remediation  equipment  and/or  associated  piping,  or any  other  property  or
equipment  installed or otherwise used by Seller in connection with its Baseline
Corrective  Action  ("Remediation   Equipment"),   but  no  claim  for  special,
exemplary,  consequential  or  indirect  damages,  or for lost  profit  shall be
asserted by Seller in connection  therewith against Purchaser.  However,  Seller
shall  have the right to pursue  such  damage  claims  against  any  independent
contractor.  All Remediation Equipment owned by Seller shall remain the property

                                       9
<PAGE>

of Seller  and may be  removed  from a 76 Asset,  upon  completion  of  Baseline
Corrective Action at a 76 Asset.

     8. INDEMNIFICATION.

     (a)  SELLER'S  INDEMNIFICATION:  Seller  shall  indemnify,  defend and hold
harmless  Purchaser  from and  against:  (i) subject to Section  4(a),  Baseline
Corrective Action Costs;  (ii) Compliance Action Costs,  except for that portion
of such costs to be paid by Purchaser  pursuant to Section 4(c); (iii) migration
of a Hazardous Substance after the Closing which would not have occurred but for
Baseline  Corrective  Action  conducted by Seller in a manner which  constitutes
gross negligence or willful  misconduct;  (iv) subject to Section 10, any damage
resulting  from any  inaccuracy in any  representation  or warranty of Seller in
this  Agreement;  (v)  Retained  Environmental  Liabilities;  and (vi) any other
obligations  for  which  Seller  has  assumed  responsibility  pursuant  to this
Agreement.

     (b) PURCHASER'S INDEMNIFICATION: Purchaser shall indemnify, defend and hold
harmless Seller from and against: (i) Corrective Action costs resulting from the
ownership or operation of the 76 Assets by Purchaser after the Closing which are
not included in Baseline  Corrective  Action  Cost;  (ii)  Purchaser's  share of
Baseline  Corrective  Action Costs as provided in Section 4(a); (iii) Compliance
Action  Costs  resulting  from the  ownership  or  operation of the 76 Assets by
Purchaser as provided in Section 4(c);  (iv) migration of a Hazardous  Substance
after the Closing  which would not have  occurred  but for  Baseline  Corrective
Action conducted by Purchaser in a manner which  constitutes gross negligence or
willful misconduct;  (v) all Baseline Corrective Action Costs incurred more than
twenty-five  (25) years after the Closing,  except as provided in Section  4(a);
(vi)  subject to Section 10, any damage  resulting  from any  inaccuracy  in any
representation  or warranty of Purchaser in this Agreement;  and (vii) any other
obligations  for which  Purchaser  has assumed  responsibility  pursuant to this
Agreement.

     (c) INDEMNIFICATION PROCEDURES.

                 Whenever  Purchaser  or Seller  becomes  aware of a claim  with
respect  to  a  76  Asset  ("Indemnified  Party")  for  which  the  other  party
("Indemnifying Party") is obligated to provide indemnification, the Indemnifying
Party shall,  within a reasonable  period of time, give prompt notice thereof (a
"Claim Notice"),  together with copies of written  information  relating to such
claim, and shall have the right to assume  responsibility  for the obligation to
be indemnified. Unless within twenty (20) days after such notice is given to the
Indemnifying Party, the Indemnifying Party gives the Indemnified Party notice of
its election to assume the obligation, the Indemnifying Party shall be deemed to
have  waived  such  right.  If the  Indemnifying  Party  elects to  assume  such
obligation,  (i) the Indemnifying  Party shall take such action as is reasonably
necessary to protect the Indemnified Party and (ii) the Indemnifying  Party will
keep the Indemnified Party fully advised as to such actions. If the Indemnifying
Party elects to assume responsibility for the obligation to be indemnified,  the
Indemnified  Party may take action that is  reasonably  necessary  to protect it
fully.

                                       10
<PAGE>


     9. UST FUNDS.

          (a) Reimbursement claims have been and will continue to be
submitted to the California Petroleum  Underground Storage Tank Cleanup Fund and
similar  federal,  state  and  local  government  funds  ("UST  Funds")  to seek
reimbursement  of Corrective  Action costs.  Purchaser and Seller shall have the
right to pursue,  control,  settle,  waive or release  reimbursement claims they
have  filed with the UST Funds and for which  they have paid  Corrective  Action
costs. Any reimbursement  claim not on file as of the Closing shall be filed and
pursued by Seller, if Corrective Action is commenced prior to the Closing.

     (b) Seller shall have the right to any reimbursement amount received from a
UST Fund as a result of  Corrective  Action  costs  incurred by Seller at a Real
Property prior to the Closing.

     (c) Purchaser  shall have the right to any  reimbursement  amount  received
from a UST Fund as a result of Corrective  Action costs incurred by Purchaser at
a Real  Property  after the Closing,  but such amount  shall reduce  Purchaser's
share  of the  aggregate  Baseline  Corrective  Action  Costs  for  purposes  of
calculating the $200 Million Cap.

     (d) Purchaser and Seller shall  cooperate with each other in the filing and
pursuit of their respective  reimbursement  claims. In the event of a dispute as
to whether a particular  reimbursement claim should be submitted by Purchaser or
Seller,  Seller shall have the right to submit such claim pending  resolution of
the dispute in accordance with the dispute resolution  provisions of Section 10.
If  Purchaser  is  determined  to have the  right to such  claim,  Seller  shall
promptly  transfer control of the claim and execute any necessary  authorization
in favor of  Purchaser.  Purchaser and Seller shall pay their  respective  costs
associated with the submission and pursuit of any reimbursement claim.

     10. DISPUTE RESOLUTION AND LIMITATIONS OF LIABILITY.

     (a)  Purchaser and Seller agree that any disputed  claim or demand  against
the other  arising  out of or relating  to this  Agreement  shall be resolved in
accordance with and subject to the procedures and limitations of Section 10.

     (b) If a dispute  arises  between the parties under this Agreement and that
dispute is not  resolved  within a reasonable  period of time,  either party may
notify the other in writing that the dispute is to be submitted to  arbitration.
Such  arbitration  shall be held in Los Angeles,  California.  The parties shall
jointly select an  environmental  consultant,  engineer,  or other  professional
reasonably  qualified (including at least 7 years' experience in the appropriate
environmental field) to arbitrate such dispute  ("Independent  Consultant").  If
the Independent Consultant is not an attorney, he or she shall have the right to
obtain the assistance of qualified legal counsel in arbitrating the dispute,  if
the  Independent  Consultant  determines  that  such  assistance  is  necessary.
Notwithstanding  any other provision  hereof,  the parties shall each bear their

                                       11
<PAGE>

respective  legal fees and costs,  and  one-half of the cost of the  Independent
Consultant (and his or her attorney, if necessary).  If the parties cannot agree
on the Independent  Consultant within sixty (60) days, either party may apply to
the American  Arbitration  Association in Los Angeles for the appointment of the
Independent Consultant.  The Independent Consultant shall establish an expedited
procedure for hearing and resolving the dispute. Each party shall have the right
to conduct  discovery  pursuant to California  Code of Civil  Procedure  section
1283.05 within sixty (60) days of the appointment of the Independent Consultant.
Unless the parties agree otherwise,  the Independent  Consultant  shall, no more
than one hundred twenty (120) days after the Independent Consultant is retained,
render a decision  resolving  the dispute,  with a written  opinion  stating the
reasons therefor.  The decision of the Independent Consultant shall be final and
binding,  and a court of  competent  jurisdiction  may enter  judgment  thereon.
Except  as  otherwise  provided  in  Section  10(c),  (d) and (e),  the  dispute
resolution  procedures of this Section 10 shall  constitute the exclusive remedy
of  the  parties  hereto  with  respect  to any  disputes  arising  out of  this
Agreement.

     (c) If a dispute arises between the parties prior to Closing concerning any
representation  in Section 2(a) or 3 under this Agreement,  the dispute shall be
limited by and resolved in accordance  with the  procedures set forth in Section
21 of the Sale and Purchase Agreement.

     (d) Notwithstanding Section 23(b) of the Sale and Purchase Agreement,  each
claim against Seller after Closing for breach of representation shall be subject
to the de minimis threshold provisions of Section 23(c) of the Sale and Purchase
Agreement and shall be aggregated  with all other claims subject to such Section
for purposes of calculating the $10 million threshold.

     (e)  Seller's  and  Purchaser's   representations  in  Sections  2  and  3,
respectively, and all liability with respect thereto, shall expire on the second
anniversary of the Closing.

     11. MISCELLANEOUS PROVISIONS.

     (a)  CONSTRUCTION.  This  Agreement  shall be governed by and  construed in
accordance with the laws of the State of California without giving effect to its
conflicts-of-laws principles.

     (b) ENTIRE  AGREEMENT.  This Agreement and the Schedules hereto  constitute
the entire  agreement among the parties  pertaining to the subject matter hereof
and supersedes all prior or contemporaneous  agreements  relating to the subject
matter  hereof.  In case of any conflict  between the body of this Agreement and
any such Schedule, the terms of the body of this Agreement shall prevail.


                                       12
<PAGE>


     (c) ASSIGNMENT.

          (i)  Subject  to  Section  11(c)(ii),  this  Agreement  shall  not  be
     assigned,  in whole or in part,  without the prior  written  consent of the
     other party.

          (ii) Seller and Purchaser may each assign this Agreement,  in whole or
     in part, to one or more of their respective  affiliates,  upon prior notice
     to the non-assigning party; provided, however, that the non-assigning party
     may require as a condition  of such  assignment  that the  assigning  party
     reasonably demonstrate and/or assure the assignee's financial and technical
     capability to perform its obligations  hereunder.  Any attempted assignment
     of this Agreement in violation of this Section  11(c)(ii) shall be null and
     void.

          (iii) This  Agreement  shall  inure to the  benefit of, and be binding
     upon, the parties hereto and their respective heirs, legal representatives,
     successors and permitted assigns, except that any such assignment shall not
     relieve the assigning party of its obligations hereunder. This Agreement is
     not intended to, and does not create, any rights in any third parties.

     (d)  FURTHER  ASSURANCES.  Each  of the  parties  hereto  shall  take  such
additional  action,  and shall cooperate with one another,  as may be reasonably
necessary to effectuate the terms of this Agreement.

     (e) NOTICES.

          (i) All  written  notices  required or  permitted  to be given or made
     hereunder  shall be deemed to have  been  duly  given or made if  delivered
     personally, or sent by overnight courier delivery or by telecopy or similar
     facsimile transmission (and confirmed in writing thereafter),  or mailed by
     prepaid  registered or certified  mail,  return receipt  requested,  to the
     other  party at the  respective  address  set forth below (or to such other
     address as a party shall  designate  for itself by written  notice given or
     made in accordance herewith):

        (1) if to Seller, to it at:

           Unocal Corporation
           2141 Rosecrans Avenue, Suite 4000
           El Segundo, California 90245

           Attn:           Neal E. Schmale
                           Chief Financial Officer
                           (310) 726-7621 (Phone)
                           (310) 726-7806 (Fax)

           cc:             Dennis P.R. Codon, Esq.
                           General Counsel
                           (310) 726-7651 (Phone)
                           (310) 726-7815 (Fax)

                                       13
<PAGE>



           (2)      if to Purchaser, to it at:

           Tosco Corporation
           72 Cummings Point Road
           Stamford, Connecticut 06902

           Attn:           Wilber McClave III, Esq.
                           General Counsel
                           (203) 977-1001 (Phone)
                           (203) 964-3187 (Fax)

           cc:             Duane B. Bordvick
                           Vice President Environmental and External Affairs
                           Tosco Corporation
                           2300 Clayton Road
                           Suite 1100
                           (510) 602-4050 (Phone)
                           (510) 602-4018 (Fax)

          (ii) Any notice,  request or other  communication  hereunder  shall be
     deemed  delivered  and given or made on the seventh  business day after the
     date of mailing, if mailed by registered or certified mail, or on the first
     business day after the date of transmittal,  if sent by courier delivery or
     by telecopy or similar  facsimile  transmission  (and  confirmed in writing
     thereafter),  or on the first  business day after the date of delivery,  if
     delivered personally.

     (f)   COUNTERPARTS.   This  Agreement  may  be  executed  in  one  or  more
counterparts, each of which shall be deemed to be an original instrument.

     (g) WAIVER.  It is agreed that any party to this  Agreement may extend time
for  performance  by any other  party  hereto or waive  the  performance  of any
obligation  of  any  other  party  hereto  or  waive  any  inaccuracies  in  the
representations  and warranties of any other party, but any such waiver shall be
in writing,  unless a non-written waiver is expressly  permitted,  and shall not
constitute  or be  construed  as a waiver  of any other  obligation,  condition,
representation or warranty under this Agreement.

     (h)  AMENDMENTS.  This  Agreement  cannot be altered,  amended,  changed or
modified in any respect or particular  unless each such  alteration,  amendment,
change or  modification  shall have been agreed to by each of the parties hereto
and reduced to writing in its entirety and signed and delivered by each party.


                                       14
<PAGE>

                 IN  WITNESS   WHEREOF,   the   parties   have   executed   this
Environmental Agreement as of the date first above written.


                                        UNION OIL COMPANY OF CALIFORNIA
                                        a California corporation



                                        By
                                            ------------------------------
                                            Name:

                                            Time:


                                        TOSCO CORPORATION
                                        a Nevada corporation



                                        By
                                            ------------------------------
                                            Name:

                                            Title:







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