Document:

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                                                                    EXHIBIT 10.3

                           EMPLOYEE MATTERS AGREEMENT

                                     BETWEEN

                              PLAINS RESOURCES INC.

                                       AND

                         PLAINS EXPLORATION & PRODUCTION

                                  COMPANY, L.P.

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                                TABLE OF CONTENTS

<TABLE>
<S>                                                                                <C>
ARTICLE I. DEFINITIONS..............................................................3

ARTICLE II. GENERAL PRINCIPLES......................................................7
   Section 2.01   Assumption of Spinco Liabilities..................................7
   Section 2.02   Transfer of Stocker Plans.........................................8
   Section 2.03   Employment Liabilities Indemnification............................8
   Section 2.04   Establishment of Spinco Plans....................................10
   Section 2.05   Spinco's Participation in Plains Plans...........................10
   Section 2.06   Terms of Participation by Spinco Employees in Spinco Plans.......11

ARTICLE III. DEFINED CONTRIBUTION PLAN.............................................12
   Section 3.01   Existing Plains 401(k) Plan Converted to Spinco 401(k) Plan......12
   Section 3.02   New Plains 401(k) Plan...........................................12
   Section 3.03   Spinco Retired Employees.........................................12

ARTICLE IV. DEFERRED COMPENSATION AND SEVERANCE....................................13
   Section 4.01   Deferred Compensation Arrangements...............................13
   Section 4.02   Severance Pay....................................................13

ARTICLE V. HEALTH AND WELFARE PLANS................................................13
   Section 5.01   Assumption of Health and Welfare Plan Liabilities................13
   Section 5.02   Claims for Health and Welfare Plans..............................13
   Section 5.03   Post-Distribution Transitional Arrangements......................14
   Section 5.04   Vendor and Insurance Arrangements................................15
   Section 5.05   COBRA and HIPPA..................................................15
   Section 5.06   Leave of Absence Programs and FMLA...............................16
   Section 5.07   Plains Workers' Compensation Program.............................16

ARTICLE VI. EQUITY AND OTHER COMPENSATION..........................................17
   Section 6.01   Option Conversion................................................17
   Section 6.02   Value and Ratio..................................................18

ARTICLE VII. TRANSITION COOPERATION................................................18
   Section 7.01   Transition Services Agreements...................................18
   Section 7.02   Payment of Liabilities, Plan Expenses and Related Matters........18
   Section 7.03   Sharing of Participant Information...............................19
   Section 7.04   Reporting and Disclosure Communications to Participants..........19
   Section 7.05   Audits Regarding Vendor Contracts................................19
   Section 7.06   Beneficiary Designations.........................................19
   Section 7.07   Request for IRS and DOL Opinions.................................20
   Section 7.08   Fiduciary Matters................................................20
   Section 7.09   Consent of Third Parties.........................................20
   Section 7.10   Tax Cooperation..................................................20
   Section 7.11   Plan Returns.....................................................20

ARTICLE VIII. EMPLOYMENT-RELATED MATTERS...........................................20
   Section 8.01   Terms of Spinco Employment.......................................20
   Section 8.02   HR Data Support Systems..........................................20
</TABLE>

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<TABLE>
<S>                                                                                <C>
   Section 8.03   Employment of Employees with U.S. Work Visas.....................20
   Section 8.04   Confidentiality and Proprietary Information......................21
   Section 8.05   Accrued Payroll, Bonuses, Profit Sharing and Commissions.........24
   Section 8.06   Payroll and Withholding..........................................24
   Section 8.07   Personal and Pay Records.........................................25
   Section 8.08   Non-Termination of Employment; No Third-Party Beneficiaries......25

ARTICLE IX. MISCELLANEOUS..........................................................25
   Section 9.01   Entire Agreement.................................................25
   Section 9.02   Governing Law....................................................25
   Section 9.03   Notices..........................................................26
   Section 9.04   Counterparts.....................................................26
   Section 9.05   Binding Effect; Assignment.......................................26
   Section 9.06   Severability.....................................................26
   Section 9.07   Failure or Indulgence not Waiver; Remedies Cumulative............26
   Section 9.08   Waivers, Modifications, Amendments...............................26
   Section 9.09   Headings.........................................................27
   Section 9.10   Relationship of Parties..........................................27
   Section 9.11   Provisions Unaffected............................................27
   Section 9.12   No Third-Party Beneficiaries.....................................27
   Section 9.13   Rights of the Parties............................................27
   Section 9.14   Effect if IPO and/or Distribution does not Occur.................27
   Section 9.15   Affiliated Companies.............................................27
   Section 9.16   Incorporation of Separation Agreement Provisions.................27
   Section 9.17   Termination......................................................28
   Section 9.18   Conflict.........................................................28
</TABLE>

Schedules

Schedule 1 - Health and Welfare Plans
Schedule 2 - Health Plans
Schedule 5.04(a) - Group Insurance Policies
Schedule 5.04(b) - HMO Agreements

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                           EMPLOYEE MATTERS AGREEMENT

     This EMPLOYEE MATTERS AGREEMENT (this "Agreement") is entered into as of
July ___, 2002, between Plains Resources Inc., a Delaware corporation ("Plains,"
and along with Spinco, the "Parties"), and Plains Exploration & Production
Company, L.P., a California limited partnership ("Plains Exploration").
Undefined capitalized terms are defined in the Separation Agreement (as defined
below).

                                    RECITALS

     WHEREAS, on the date hereof, Stocker Inc. owns a 2.5% general partner
interest in Plains Exploration and Plains owns a 97.5% limited partner interest
in Plains Exploration; and

     WHEREAS, the Parties currently contemplate that Plains Exploration will
(collectively, the "Conversion") (1) convert from a California limited
partnership to a Delaware limited partnership, and immediately thereafter (2)
convert from a Delaware limited partnership to a Delaware corporation (such
corporation, the "Converted Corporation"); and

     WHEREAS, the Board of Directors of Plains has determined that it is in the
best interests of Plains to separate Plains' existing businesses into two
independent business groups; and

     WHEREAS, to effectuate the foregoing, Plains and Spinco have entered into a
Master Separation Agreement, dated as of the date hereof (the "Separation
Agreement"), pursuant to which, among other things, Plains will transfer certain
assets to Spinco and Spinco will assume certain liabilities of Plains; and

     WHEREAS, the Parties currently contemplate that Spinco will make an initial
public offering ("IPO") of an amount of its common stock pursuant to a
registration statement on Form S-1 filed pursuant to the Securities Act of 1933,
as amended, that will reduce Plains' ownership of Spinco by less than 20%; and

     WHEREAS, Plains currently contemplates that, following the IPO, it will
complete the Distribution; and

     WHEREAS, in furtherance of the foregoing, the Parties have agreed to enter
into this Agreement to allocate between them assets, liabilities and
responsibilities with respect to certain employee compensation, benefit plans
and programs, and certain employment matters.

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

                                   ARTICLE I.
                                   DEFINITIONS

     "Adjusted Plains Option" shall have the meaning set forth in Section 6.01.

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     "Agreement" means this Employee Matters Agreement, including all the
Addenda, Schedules and Exhibits hereto, and all amendments made hereto from time
to time.

     "COBRA" means the continuation coverage requirements for "group health
plans" under Title X of the Consolidated Omnibus Budget Reconciliation Act of
1985, as amended from time to time, and as codified in Code Section 4980B and
ERISA Sections 601 through 608.

     "Common Stock," when immediately preceded by "Plains," means the common
stock, par value $.10 per share of Plains. When immediately preceded by
"Spinco," "Common Stock" means the common stock, par value $.01 per share, of
Spinco.

     "Conversion" is defined in the Recitals.

     "Converted Corporation" is defined in the Recitals.

     "Deferred Compensation Arrangements," when immediately preceded by
"Plains," means any Plains deferred compensation arrangements. When immediately
preceded by "Spinco," "Deferred Compensation Arrangements" means any deferred
compensation arrangements to be established by Spinco pursuant to Section 2.04
and Section 4.01 that corresponds to the Plains Deferred Compensation
Arrangements.

     "DOL" means the United States Department of Labor.

     "Employment Agreement" means any employment agreement entered into by an
employee with either Plains or Spinco.

     "Employment Liabilities" means all claims, causes of action, demands,
liabilities, debts or damages (known or unknown) related to all employment
matters addressed in this Agreement, including but not limited to claims arising
under federal, state or local statute (including, without limitation, Title VII
of the Civil Rights Act of 1964, as amended ("Title VII"); the Age
Discrimination in Employment Act of 1967, including the Older Workers Benefit
Protection Act of 1990 ("ADEA"); the Civil Rights Act of 1866, as amended, the
Civil Rights Act of 1991, the Americans with Disabilities Act of 1990 ("ADA"),
the Energy Reorganization Act, as amended, 42 U.S.C. ss. 5851; the Workers
Adjustment and Retraining Notification Act of 1988; the Pregnancy Discrimination
Act of 1978; ERISA; FMLA; the Fair Labor Standards Act; the Occupational Safety
and Health Act; the Equal Pay Act); claims in connection with workers'
compensation or "whistle blower" statutes and/or contract, tort, defamation,
slander, wrongful termination or any other state or federal regulatory,
statutory or common law or local ordinance.

     "ERISA" means the Employee Retirement Income Security Act of 1974, as
amended from time to time.

     "Flexible Benefits Plan," when immediately preceded by "Plains," means the
Plains Flexible Benefits Plan prior to the Distribution Date or any successor
plan after such date. When immediately preceded by "Spinco," Flexible Benefits
Plan means the flexible benefits plan to be

                                        4

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sponsored by Spinco pursuant to Section 2.04 and ARTICLE V that corresponds to
the Plains Flexible Benefits Plan.

     "FMLA" means the Family and Medical Leave Act of 1993, as amended from time
to time.

     "401(k) Plan" means a tax-qualified 401(k) plan.

     "Group Insurance Policies" is defined in Section 5.04 and the Schedule
thereto.

     "Health and Welfare Plans," when immediately preceded by "Plains," means
the Plains Health Plans, the Plains Flexible Benefits Plan, and the health and
welfare plans listed on Schedule 1 and any similar or successor plans, programs
or arrangements. When immediately preceded by "Spinco," "Health and Welfare
Plans" means the Spinco Health Plans, the Spinco Flexible Benefits Plan, and the
health and welfare plans to be established by Spinco pursuant to Section 2.04
and ARTICLE V that correspond to the respective Plains Health and Welfare Plans.

     "Health Plans," when immediately preceded by "Plains," means the Plans set
forth on Schedule 2, and any similar or successor plans, programs or
arrangements. When immediately preceded by "Spinco," "Health Plans" means the
health plans, programs and arrangements to be established by Spinco pursuant to
Section 2.04 and ARTICLE V that correspond to the respective Plains Health
Plans.

     "HMO" means a health maintenance organization that provides benefits under
the Plains Health Plans or the Spinco Health Plans.

     "HMO Agreements" is defined in Section 5.04 and Schedule 5.04(b).

     "Incentive Compensation Plan" means any annual or long-term incentive plan
for employees or executives.

     "IPO" is defined in the Recitals.

     "IRS" means the United States Internal Revenue Service.

     "Leave of Absence Programs," when immediately preceded by "Plains," means
the personal, medical, military and FMLA leave offered from time to time under
the personnel policies and practices of Plains. When immediately preceded by
"Spinco," "Leave of Absence Programs" means the leave of absence programs
established and maintained by Spinco.

     "Option," when immediately preceded by "Plains," means an option to
purchase Plains common stock pursuant to a Stock Plan. When immediately preceded
by "Spinco," "Option" means an option to purchase Spinco common stock pursuant
to a plan providing such benefits to be established by Spinco pursuant to
Section 2.04 and ARTICLE VI.

     "Outsource" is defined in Section 5.02(b).

                                        5

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     "Participating Company" means: (a) Plains; (b) any Person (other than an
individual) that Plains has approved for participation in, has accepted
participation in, and which is participating in, a Plan sponsored by Plains; or
(c) any Person (other than an individual) which, by the terms of such a Plan,
participates in such a Plan sponsored by Plains or any employees of which, by
the terms of such a Plan, participate in or are covered by such a Plan.

     "Parties" is defined in the Preamble.

     "PBGC" means the Pension Benefit Guaranty Corporation.

     "Plains" is defined in the Preamble. In all such instances in which Plains
is referred to in this Agreement, it shall also be deemed to include a reference
to each member of the Plains Group, unless it specifically provides otherwise;
Plains shall be solely responsible to Spinco for ensuring that each member of
the Plains Group complies with the applicable terms of this Agreement.

     "Plains Employee" means an individual who, on the Distribution Date, is or
was employed with any member of the Plains Group and is not a Spinco Employee.

     "Plains Exploration" is defined in the Preamble.

     "Plains Terminated Employee" means any individual who is a former employee
of any member of the Plains Group and who, on the Distribution Date, is not a
Spinco Employee.

     "Plains WCP" means the Plains Workers' Compensation Program, comprised of
the various arrangements established by a member of the Plains Group to comply
with the workers' compensation requirements of the states in which the Plains
Group conducts business.

     "Plan," depending on the context, may mean any plan, policy, program,
payroll practice, arrangement, contract, trust, insurance policy, or any
agreement or funding vehicle providing compensation or benefits to employees,
former employees or directors of Plains or Spinco.

     "QDRO" means a domestic relations order which qualifies under Code Section
414(p) and ERISA Section 206(d) and which creates or recognizes an alternate
payee's right to, or assigns to an alternate payee, all or a portion of the
benefits payable to a participant under the Plains 401(k) Plan.

     "QMCSO" means a medical child support order which qualifies under ERISA
Section 609(a) and which creates or recognizes the existence of an alternate
recipient's right to, or assigns to an alternate recipient the right to, receive
benefits for which a participant or beneficiary is eligible under any of the
Health Plans.

     "SEC" means the United States Securities and Exchange Commission.

     "Separation Agreement" is defined in the Recitals.

                                        6

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     "Spinco" means, as the case may be, Plains Exploration or the Converted
Corporation. In all such instances in which Spinco is referred to in this
Agreement, it shall also be deemed to include a reference to each member of the
Spinco Group, unless it specifically provides otherwise; Spinco shall be solely
responsible to Plains for ensuring that each member of the Spinco Group complies
with the applicable terms of this Agreement.

     "Spinco Employee" means any individual who, as of the Distribution Date,
is: (a) either actively employed by, or on a leave of absence from, any member
of the Spinco Group; (b) a Spinco Terminated Employee; (c) an alternate payee
under a QDRO, alternate recipient under a QMCSO, beneficiary, covered dependent,
or qualified beneficiary (as such term is defined under COBRA), of an employee
described in Subsection (a) or (b) above; or (d) an employee or group of
employees designated by Plains and Spinco, by mutual agreement, as Spinco
Employees; but not (e) a Spinco Retired Employee. An employee may be a Spinco
Employee pursuant to this Section regardless of whether such employee is, as of
the Distribution Date, alive, actively employed, on a temporary leave of absence
from active employment, on layoff, terminated from employment, retired or on any
other type of employment or post-employment status relative to a Plains Plan,
and regardless of whether, as of the Distribution Date, such employee is then
receiving any benefits from a Plains Plan.

     "Spinco Retired Employee" means any individual who would have qualified as
a Spinco Employee but who retired on or before the Distribution Date and who is
identified as a Spinco Retired Employee by mutual agreement between Spinco and
Plains on or before the Distribution Date.

     "Spinco Terminated Employee" means any individual who is a former employee
of any member of the Plains Group who was terminated from any member of the
Spinco Group on or before the Distribution Date. Notwithstanding the foregoing,
"Spinco Terminated Employee" shall not, unless otherwise expressly provided to
the contrary in this Agreement, include: (a) an individual who is a Plains
Employee at the Distribution Date; (b) an individual who is otherwise a Spinco
Terminated Employee, but who is subsequently employed by any member of the
Plains Group on or prior to the Distribution Date; or (c) a Spinco Retired
Employee.

     "Spinco WCP Claims" is defined in Section 5.07(a)(i).

     "Stock Plan," when immediately preceded by "Plains," means the 2001 Stock
Incentive Plan, 1996 Stock Incentive Plan, 1992 Stock Incentive Plan and 1991
Management Option Plan, and when immediately preceded by "Spinco," means the
stock incentive plan to be established and maintained by Spinco.

     "Stocker Plans" means all Plans sponsored by Stocker Resources, Inc.

                                   ARTICLE II.
                               GENERAL PRINCIPLES

     Section 2.01 Assumption of Spinco Liabilities. Except as specified
otherwise in this Agreement, or as mutually agreed upon by Spinco and Plains
from time to time, Plains hereby assumes and agrees to pay, perform, fulfill and
discharge, in accordance with their respective

                                        7

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terms, subject to Section 7.02 and Section 2.03, all Liabilities incurred prior
to the Distribution Date (whether or not reported prior to the Distribution
Date), relating to any employee of Plains who becomes a Spinco Employee on the
Distribution Date and any employee of Plains who remains employed by Plains
prior to and after the Distribution Date. Spinco hereby assumes and agrees to
pay, perform, fulfill and discharge, in accordance with their respective terms,
all of the following: (a) subject to Section 7.02 and to the indemnification
provisions of Section 2.03, all Liabilities to or relating to employees hired by
any member of the Spinco Group prior to the Distribution Date, in each case
relating to, arising out of or resulting from employment by any member of the
Spinco Group before the Distribution Date (b) subject to Section 7.02 and to the
indemnification provisions of Section 2.03, all Liabilities to or relating to
Spinco Employees, in each case relating to, arising out of or resulting from
employment by any member of the Spinco Group on or after the Distribution Date,
and (c) subject to Section 7.02 and to the indemnification provisions of Section
2.03, all other Liabilities relating to, arising out of or resulting from
obligations, liabilities and responsibilities expressly assumed or retained by
any member of the Spinco Group or a Spinco Plan, pursuant to this Agreement,
including but not limited to the Plains Deferred Compensation Arrangements and
any newly established Spinco Deferred Compensation Arrangements.

     Section 2.02 Transfer of Stocker Plans. Effective as of the Distribution
Date, Plains shall transfer all Stocker Plans with their associated assets and
liabilities to a member of the Spinco Group.

     Section 2.03 Employment Liabilities Indemnification.

     (a) Indemnification by Spinco. Except as otherwise provided in this
Agreement, including Section 2.03(c), Spinco shall, for itself and as agent for
each member of the Spinco Group, indemnify, defend (or, where applicable, pay
the defense costs for) and hold harmless the Plains Indemnitees from and against
any and all Employment Liabilities that any third party seeks to impose upon the
Plains Indemnitees, or which are imposed upon the Plains Indemnitees, if and to
the extent such Employment Liabilities relate to, arise out of or result from
any of the following items (without duplication):

          (i) any acts or omissions or alleged acts or omissions by or on behalf
     of any member or person employed by a member of the Spinco Group in the
     conduct of the Spinco Business;

          (ii) any claim by an officer of any member of the Spinco Group (who is
     an officer as of the IPO Closing Date) against any member or employee of
     any member of the Plains Group except with respect to benefit obligations
     of Spinco Employees assumed by Plains pursuant to a specific provision of
     this Agreement;

          (iii) any Liabilities assumed or retained by Spinco pursuant to
     Section 2.01; and

          (iv) any breach by Spinco or any member or person employed by a member
     of the Spinco Group of this Agreement.

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     If any member of the Spinco Group makes a payment to the Plains Indemnitees
hereunder, and the Employment Liability on account of which such payment was
made is subsequently diminished, either directly or through a third-party
recovery, Plains will promptly repay (or will procure a Plains Indemnitee to
promptly repay) such member of the Spinco Group the amount by which the payment
made by such member of the Spinco Group exceeds the actual cost of the
associated indemnified Employment Liability.

     (b) Indemnification by Plains. Except as otherwise provided in this
Agreement, including Section 2.03(c), Plains shall, for itself and as agent for
each member of the Plains Group, indemnify, defend (or, where applicable, pay
the defense costs for) and hold harmless the Spinco Indemnitees from and against
any and all Employment Liabilities that any third party seeks to impose upon the
Spinco Indemnitees, or which are imposed upon the Spinco Indemnitees, if and to
the extent such Employment Liabilities relate to, arise out of or result from
any of the following items (without duplication):

          (i) any acts or omissions or alleged acts or omissions by or on behalf
     of any member or person employed by a member of the Plains Group in the
     conduct of the Plains Business;

          (ii) any claim by an officer of any member of the Plains Group (who is
     an officer as of the IPO Closing Date) against any member or employee of
     any member of the Spinco Group;

          (iii) any Liabilities retained by Plains pursuant to this Agreement;
     and

          (iv) any breach by Plains or any member or person employed by a member
     of the Plains Group of this Agreement.

     If any member of the Plains Group makes a payment to the Spinco Indemnitees
hereunder, and the Employment Liability on account of which such payment was
made is subsequently diminished, either directly or through a third-party
recovery, Spinco will promptly repay (or will procure a Spinco Indemnitee to
promptly repay) such member of the Plains Group the amount by which the payment
made by such member of the Plains Group exceeds the actual cost of the
indemnified Employment Liability.

     (c) Exceptions. In accordance with the current practice in effect as of the
execution of the Agreement, with respect to claims for benefits or compensation,
if an underlying act or omission as contemplated in Section 2.03(a) or Section
2.03(b) occurs and such act or omission constitutes the principal basis for such
a claim, then Section 2.03(a) or Section 2.03(b) shall apply, as applicable, to
establish indemnification obligations. If, however, no specific act or omission
occurs that is attributable to Plains or Spinco and the principal underlying
basis for a claim for benefits or compensation involves plan administration or
other similar systemic type activities related to maintenance of plans,
notwithstanding Section 2.03(a) and Section 2.03(b), in accordance with the
current practice in effect as of the execution of this Agreement, Spinco and
Plains shall be responsible for their pro rata allocated share of costs to
defend such claim. In addition, if a claim relates specifically to the transfer
or other movement of employment between Plains and Spinco in connection with the
Separation and to the employee benefit changes made

                                        9

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in connection therewith, then notwithstanding Section 2.03(a) and Section
2.03(b), in accordance with the current practice in effect as of the execution
of this Agreement, Spinco and Plains shall be responsible for their pro rata
allocated share of costs to defend such claim.

     (d) Relationship to Article III of Separation Agreement.

          (i) Unless expressly modified in this Section 2.03, all other
     provisions of Article III of the Separation Agreement will apply to an
     indemnifiable claim.

          (ii) Any claim which is not an Employment Liability will only be
     subject to the provisions of the Separation Agreement.

     Section 2.04 Establishment of Spinco Plans.

     (a) Health and Welfare Plans. Except as specified otherwise in this
Agreement, effective as of the Distribution Date or such other date(s) as Plains
and Spinco may mutually agree, Spinco shall adopt sponsorship of the existing
Plains Health and Welfare Plans and shall amend them to reflect the new
sponsorship. Plains shall adopt comparable Health and Welfare Plans.

     (b) 401(k) Plan and Fringe Benefits. Except as specified otherwise in this
Agreement, effective as of the Distribution Date or such other date(s) as Plains
and Spinco may mutually agree, Spinco shall adopt the existing Plains 401(k)
Plan as more fully described in ARTICLE III and shall amend it to reflect the
new sponsorship. Plains shall adopt a comparable 401(k) Plan.

     (c) Equity and Other Compensation. Except as specified otherwise in this
Agreement, effective as of the date of the IPO, or such other earlier date(s) as
Plains and Spinco may mutually agree, Spinco shall establish (i) the Spinco 2002
Stock Incentive Plan, and (ii) the Spinco Deferred Compensation Arrangements.
The foregoing Spinco 2002 Stock Incentive Plan shall be substantially comparable
to the Plains Plan as in effect on the IPO Closing Date.

     (d) Plains and Spinco Under No Obligation to Maintain Plans. Except as
specified otherwise in this Agreement, nothing in this Agreement shall preclude
Spinco or Plains, at any time from amending, merging, modifying, terminating,
eliminating, reducing, or otherwise altering in any respect any Plan, any
benefit under any Plan or any trust, insurance policy or funding vehicle related
to any Plan (to the extent permitted by law).

     Section 2.05 Spinco's Participation in Plains Plans.

     (a) Participation in Plains Plans.

          (i) Except as specified otherwise in this Agreement, or as Plains and
     Spinco may mutually agree, Spinco shall adopt as a Participating Company
     the Plains Plans in effect as of the date hereof, to the extent that Spinco
     has not yet established substantially comparable Plans and such
     participation is necessary for any Spinco Employee to be covered by such
     Plan prior to the Distribution Date. Effective as of any date on or after
     the date hereof and before the Distribution Date (or such other date as
     Plains and Spinco

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     may mutually agree upon), any member of the Spinco Group not described in
     the preceding sentence may, at its request and with the consent of Plains
     and Spinco, become a Participating Company in any or all of the Plains
     Plans, to the extent that Spinco has not yet established a substantially
     comparable Plan.

          (ii) On and after the Distribution Date, Spinco Retired Employees
     shall continue to participate in the Plains Plans for which they are
     eligible as of the Distribution Date, including, but not limited to the
     Plains 401(k) Plan and any Plains Plan as provided in ARTICLE IV.

     (b) Plains' General Obligations as Plan Sponsor.

          (i) To the extent that Spinco is a Participating Company in any Plains
     Plan(s), Plains shall continue to administer, or cause to be administered,
     in accordance with their terms and applicable law, such Plains Plan(s), and
     shall have the sole and absolute discretion and authority to interpret the
     Plains Plan(s), as set forth therein. Plains shall not, without first
     consulting with Spinco, amend or terminate any material feature of any
     Plains Plan in which Spinco is a Participating Company, except to the
     extent such amendment or termination would not affect any benefits of
     Spinco Employees under such Plan or as may be necessary or appropriate to
     comply with applicable law.

          (ii) With regard to Spinco Retired Employees participating in Plains
     Plans after the Distribution Date, Plains shall continue to administer, or
     cause to be administered, in accordance with their terms and applicable
     law, such Plains Plans, and shall have sole and absolute discretion and
     authority to interpret such Plans or amend or terminate such Plans, as set
     forth therein.

     (c) Spinco's General Obligations as Participating Company. Spinco shall
perform with respect to its participation in the Plains Plans, the duties of a
Participating Company as set forth in each such Plan or any procedures adopted
pursuant thereto, including: (i) assisting in the administration of claims, to
the extent requested by the claims administrator of the applicable Plains Plan;
(ii) cooperating fully with Plains Plan auditors, benefit personnel and benefit
vendors; (iii) preserving the confidentiality of all financial arrangements
Plains has or may have with any vendors, claims administrators, trustees or any
other entity or individual with whom Plains has entered into an agreement
relating to the Plains Plans; and (iv) preserving the confidentiality of
participant information (including, without limitation, health information in
relation to FMLA leaves) to the extent not specified otherwise in this
Agreement.

     (d) Termination of Participating Company Status. Except as specified
otherwise in this Agreement or otherwise may be mutually agreed upon by Plains
and Spinco, effective as of the Distribution Date or such other date as Spinco
establishes a substantially comparable Plan (as specified in Section 2.04 or
otherwise in this Agreement), Spinco shall automatically cease to be a
Participating Company in the corresponding Plains Plan except to the extent that
Spinco shall adopt such Plan in which case Plains shall cease to sponsor or be a
Participating Company in such Plan.

     Section 2.06 Terms of Participation by Spinco Employees in Spinco Plans.

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     (a) Non-Duplication of Benefits. As of the Distribution Date or such other
date that applies to the particular Spinco Plan, the separate Spinco Plans shall
be, with respect to employees of the Spinco Group, in all respects the
successors in interest to, and shall not provide benefits that duplicate
benefits provided by, the corresponding Plains Plans. Plains and Spinco shall
mutually agree, if necessary, on methods and procedures, including amending the
respective Plan documents, to prevent employees of the Spinco Group from
receiving duplicate benefits from the Plains Plans and the Spinco Plans.

     (b) Service Credit. Except as specified otherwise in this Agreement, with
respect to Spinco Employees, each Spinco Plan shall provide that all service,
all compensation and all other benefit-affecting determinations that, as of the
Distribution Date, were recognized under the corresponding Plains Plan shall, as
of the Distribution Date, receive full recognition and credit and be taken into
account under such Spinco Plan to the same extent as if such items occurred
under such Spinco Plan, except to the extent that duplication of benefits would
result. The service crediting provisions shall be subject to any respectively
applicable "service bridging," "break in service," "employment date," or
"eligibility date" rules under the Spinco Plans and the Plains Plans.

                                  ARTICLE III.
                            DEFINED CONTRIBUTION PLAN

     Section 3.01 Existing Plains 401(k) Plan Converted to Spinco 401(k) Plan.
Effective on or before the Distribution Date, Spinco shall assume the
sponsorship of the existing Plains 401(k) Plan and related trust and make such
amendments as necessary to reflect its new sponsorship by Spinco for the benefit
of Spinco Employees (renamed the "Spinco 401(k) Plan"). As soon as reasonably
practicable following the Distribution Date, Spinco shall cause to be determined
for the new Plains 401(k) Plan the amount of assets to be transferred from the
Spinco 401(k) Plan to the new Plains 401(k) Plan. Such amount shall be equal to
the greater of (a) the amount required under Code Section 414(l), or (b) the
amount within the sub-account(s) within the related trust that has been
separately maintained and accounted for on behalf of then currently active
employees of the members of the Plains Group.

     Section 3.02 New Plains 401(k) Plan. Effective on or before the
Distribution Date, Plains shall establish, or cause to be established, a trust,
which is intended to be qualified under Code Section 401(a), exempt from
taxation under Code Section 501(a)(1), and form the new Plains 401(k) Plan.
Except as provided in this ARTICLE III, and subject to market availability, such
new Plains 401(k) Plan shall be substantially comparable to the previously
existing Plains 401(k) Plan as applicable to employees of members of the Plains
Group immediately prior to the Distribution Date.

     Section 3.03 Spinco Retired Employees. Notwithstanding the above, account
balances of Spinco Retired Employees, if any, shall remain in the new Plains
401(k) Plan after the Distribution Date.

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                                   ARTICLE IV.
                       DEFERRED COMPENSATION AND SEVERANCE

     Section 4.01 Deferred Compensation Arrangements. Effective as of the
Distribution Date or such other date as Plains and Spinco may mutually agree,
Spinco shall establish the Spinco Deferred Compensation Arrangements for Spinco
Employees which shall be substantially comparable to the Plains Deferred
Compensation Arrangements. As of the Distribution Date, Spinco shall assume all
Liabilities to or relating to (i) the Spinco Employees under the Plains Deferred
Compensation Arrangements, and (ii) all other terminated or retired participants
in the Plains Deferred Compensation Arrangements whether or not such
participants previously worked for Plains or Spinco; provided, however, that
Plains shall transfer a cash amount equal to the cost of such Liabilities
transferred to Spinco as soon as practicable following the Distribution Date or
such other date as Plains and Spinco may mutually agree.

     Section 4.02 Severance Pay. Spinco shall establish such severance plans as
it deems necessary in its discretion. No Spinco Employee, other than those whose
Employment Agreement entitles them to severance, shall become eligible for
severance benefits on account of Spinco ceasing to be a Subsidiary of Plains as
of the Distribution Date.

                                   ARTICLE V.
                            HEALTH AND WELFARE PLANS

     Section 5.01 Assumption of Health and Welfare Plan Liabilities.

     (a) General - Health and Welfare Plans. Upon the Distribution Date, Spinco
shall assume each Plains Health and Welfare Plan and Plains shall establish
comparable Plans. Such successor Plains Health and Welfare Plans shall retain
all Liabilities incurred (whether or not reported) through the Distribution Date
or such other date as Plains and Spinco may mutually agree under each such
Plains Health and Welfare Plan, whether or not claims are filed before the
Distribution Date, by or on behalf of Spinco Employees or their spouses or
dependents. To the extent that Spinco hires any employees prior to the
Distribution Date, Spinco shall indemnify each such Plan against the
pre-Distribution Date Liabilities by paying the current cost of coverage
associated with such Spinco Employees or their spouses or dependents, to the
extent not already paid.

     (b) Substantially Similar Self-Insured Plans. Any Health and Welfare Plan
self-insured by Plains and substantially similar to any Spinco Health and
Welfare Plan established as of the Distribution Date, or such other date as
agreed upon by Plains and Spinco, shall cease to be responsible for Liabilities
to or relating to Spinco Employees under the Plains Health and Welfare Plans as
of the Distribution Date, and the corresponding Spinco Health and Welfare Plans
shall assume such Liabilities as of the Distribution Date.

     Section 5.02 Claims for Health and Welfare Plans.

     (a) Administration of Plains Claims. Plains shall administer claims
incurred under the Plains Health and Welfare Plans by Spinco Employees before
the Distribution Date, but only to the extent that Spinco has not, before the
Distribution Date, established and assumed

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<PAGE>

administrative responsibility for a comparable Plan. Any determination made or
settlements entered into by Plains with respect to such claims shall be final
and binding.

     (b) Outsourcing of Claims by Plains. Plains shall have the right to engage
a third party administrator, vendor, or insurance company to administer
("Outsource") claims incurred under the Plains Health and Welfare Plans,
including claims incurred by employees of the members of the Spinco Group before
the Distribution Date. Plains may determine the manner and extent of such
Outsourcing, including the selection of one or more third party administrators,
vendors, or insurance companies and the ability to transfer the liability for
such claims to one or more independent insurance companies. Plains has
Outsourced administration of many Plains Health and Welfare Plans, as set forth
in Section 5.04 and the Schedule thereto.

     (c) Outsourcing of Claims by Spinco. Plains shall use its Reasonable
Efforts for and on behalf of Spinco to negotiate for Outsourcing arrangements
with its third party administrators, vendors, or insurance companies with
comparable features to each of Plains' current Outsourcing arrangements.

     Section 5.03 Post-Distribution Transitional Arrangements.

     (a) Continuance of Elections, Co-Payments and Maximum Benefits.

          (i) As of the Distribution Date or such other date as Plains and
     Spinco may mutually agree, Spinco and Plains shall cause their respective
     successor or adopted Health and Welfare Plans to maintain substantially
     comparable coverage and contribution elections, if any, made by their
     respective employees under the Plains Health and Welfare Plans and apply
     such elections under the successor Plains Health and Welfare Plans and
     Spinco Health and Welfare Plans for the remainder of the period or periods,
     if any, for which such elections are by their terms applicable. The
     transfer or other movement of employment between Plains and Spinco in
     connection with the Distribution shall constitute neither a "status change"
     under the Plains Health and Welfare Plans or the Spinco Health and Welfare
     Plans nor a "qualifying event," as defined under COBRA.

          (ii) On and after the Distribution Date, Spinco and Plains shall cause
     their respective Health Plans to recognize and give credit for all benefits
     paid to their respective employees under the Plains Health Plans for (A)
     all amounts applied to deductibles, out of pocket maximums, co-payments and
     other applicable benefit coverage limits with respect to which such
     expenses have been incurred by their respective employees under the Plains
     Health Plans for the remainder of the calendar year in which the
     Distribution Date occurs and (B) all benefits paid to their respective
     employees under the Plains Health Plans for purposes of determining when
     such persons have reached their lifetime maximum benefits under their
     respective Health Plans. Notwithstanding the above, their respective
     obligations under this Section 5.03(a)(ii) shall be limited by the market
     availability of health insurance products or other arrangements satisfying
     the criteria described above. Spinco and Plains shall use their Reasonable
     Efforts to locate and engage the services of a vendor whose policies or
     other arrangements meet the requirements above.

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<PAGE>

     (b) Flexible Benefits Plan. To the extent any Spinco Employee contributed
to an account under the Plains Flexible Benefits Plan during the calendar year
that includes the Distribution Date, then effective as of the Distribution Date,
Plains shall transfer to the Spinco Flexible Benefits Plan the account balances
of Spinco Employees for such calendar year under the Plains Flexible Benefits
Plan, regardless of whether the account balance is positive or negative.

     Section 5.04 Vendor and Insurance Arrangements. To the extent applicable,
Plains shall use its Reasonable Efforts (1) for and on behalf of Spinco to
negotiate for, effective as of the Distribution Date or such other date as
Plains and Spinco mutually agree upon: (a) the assignment of the Group Insurance
Policies set forth in Schedule 5.04(a) (the "Group Insurance Policies") to
Spinco; (b) the assignment of the HMO Agreements entered into by Plains set
forth in Schedule 5.04(b) (the "HMO Agreements") to Spinco, and (c) competitive
premium rates for all Spinco Health and Welfare Plans. In each case, Spinco
shall, as of the Distribution Date or such other date as Plains and Spinco
mutually agree upon, establish, adopt and/or implement acceptable contracts,
agreements or arrangements. . To the extent applicable, Plains and Spinco shall
collaborate and use Best Efforts for and on behalf of Plains to negotiate for,
effective as of the Distribution Date or such other date as Plains and Spinco
mutually agree upon: (a) Group Insurance Policies with comparable features and
costs to the Group Insurance Policies previously entered into by Plains; (b) HMO
Agreements with comparable features and costs to the HMO Agreements entered into
by Plains, and (c) competitive premium rates for all Plains Health and Welfare
Plans. In each case, Plains shall, as of the Distribution Date or such other
date as Plains and Spinco mutually agree upon, establish, adopt and/or implement
acceptable contracts, agreements or arrangements. In accordance with Section
7.03, Plains and Spinco shall on or before the Distribution Date provide each
other upon request, copies of such contracts or successor arrangements thereto
identified in Schedules 5.04(a) and (b).

     Section 5.05 COBRA and HIPPA. Plains shall be responsible, through the
Distribution Date, for compliance with the health care continuation coverage
requirements of COBRA, the portability requirements under the Health Insurance
Portability and Accountability Act of 1996 ("HIPPA") and the Plains Health and
Welfare Plans with respect to any employees of the members of the Spinco Group
and qualified beneficiaries (as such term is defined under COBRA). Plains shall
provide all necessary notices, or cause the notices to be provided, as soon as
administratively practical, but in no event later than required under COBRA.
Spinco shall be responsible for providing Plains or its agents with all
necessary employee change notices and related information for covered
dependents, spouses, qualified beneficiaries (as such term is defined under
COBRA), and alternate recipients pursuant to QMCSO, in accordance with
applicable Plains COBRA policies and procedures. As soon as administratively
practicable after the Distribution Date, Plains shall provide Spinco, through
hard copy, electronic format or such other mechanism as is appropriate under the
circumstances, with a list of all qualified beneficiaries (as such term is
defined under COBRA) that relate to the members of the Spinco Group and the
relevant information pertaining to their coverage elections. Effective as of the
Distribution Date, Spinco shall be solely responsible for compliance with the
health care continuation coverage requirements of COBRA and the portability
requirements under HIPPA for the Spinco Health and Welfare Plans for Spinco
Employees and their qualified beneficiaries (as such term is defined under
COBRA).

                                       15

<PAGE>

     Section 5.06 Leave of Absence Programs and FMLA.

     (a) Allocation of Responsibilities After Distribution Date. Effective as of
the Distribution Date, Spinco shall establish the Spinco Leave of Absence
Programs and FMLA programs and shall be responsible for administering leaves of
absence and complying with FMLA with respect to Spinco Employees.

     (b) Disclosure. As soon as administratively practicable after the
Distribution Date, Plains shall provide to Spinco copies of all records
pertaining to the leaves of absence and FMLA with respect to all Spinco
Employees to the extent such records have not been previously provided.

     Section 5.07 Plains Workers' Compensation Program.

     (a) Administration of Claims.

          (i) Through the Distribution Date or such other date as Plains and
     Spinco may mutually agree, Plains shall continue to be responsible for the
     administration of all claims that (A) are, or have been, incurred under the
     Plains WCP before the Distribution Date by employees of the Spinco Group
     ("Spinco WCP Claims"), and (B) have been historically administered by
     Plains or its third party administrator. However, Plains will advise Spinco
     of and secure approval for any material changes to current policy or
     practice with respect to the administration of Spinco WCP Claims.

          (ii) Effective as of the Distribution Date or such other date as
     Plains and Spinco may mutually agree, Spinco shall be responsible for the
     administration of all Spinco WCP Claims.

          (iii) Each party shall fully cooperate with the other with respect to
     the administration and reporting of Spinco WCP Claims, the payment of
     Spinco WCP Claims determined to be payable, and the transfer of the
     administration of any Spinco WCP Claims to the other party.

     (b) Self-Insurance Status. Plains shall maintain and amend, as necessary,
its certificates of self-insurance and any other applicable policies to include
Spinco until the Distribution Date, and Spinco shall fully cooperate with Plains
in obtaining such amendments. Plains shall use its Reasonable Efforts to obtain
self-insurance status for workers' compensation for Spinco effective as of the
Distribution Date in those jurisdictions in which Spinco conducts business, in
which Plains is self-insured, and where Plains and Spinco mutually agree that
such status is beneficial to Spinco. Spinco hereby authorizes Plains to take all
actions necessary and appropriate on its behalf in order to obtain such
self-insurance status. All costs incurred by Plains in amending such
certificates, including without limitation filing fees, adjustments of security
and excess loss policies and amendments of safety programs, shall be shared pro
rata by Plains and Spinco.

                                       16

<PAGE>

     (c) Insurance Policy.

          (i) Effective as of the Distribution Date, in all states other than
     those states where Spinco is to be self-insured pursuant to Section 5.07(b)
     above, Plains shall use its Reasonable Efforts to negotiate for workers'
     compensation insurance policies on behalf of Spinco from the issuing
     insurance companies (as set forth in the relevant portion of Schedule
     5.04(a)) or different insurance companies which are comparable to the
     policies previously maintained by Plains; provided that the retention under
     such Spinco policies shall be as determined by Spinco.

          (ii) Plains shall use its Reasonable Efforts to cause the premium
     rates for all workers' compensation insurance policies for both Plains and
     Spinco in effect for periods through the Distribution Date to be based on
     the aggregate number of employees covered under the workers' compensation
     insurance policies of both Plains and Spinco. Any premiums due under the
     separate workers' compensation insurance issued to Spinco shall be payable
     by Spinco.

                                   ARTICLE VI.
                          EQUITY AND OTHER COMPENSATION

     Section 6.01 Option Conversion. Fully vested tranches of outstanding Plains
Options granted prior to the Distribution Date that are unexercised and
unexpired as of the Distribution Date shall continue as Adjusted Plains Options
and employment at Spinco shall be treated as employment at Plains for the option
termination provisions. Unvested tranches of Plains Options held by Plains
employees shall continue as Adjusted Plains Options. Unvested tranches of Plains
Options held by Spinco Employees shall be converted to Spinco Options. In
general, a Plains Option that qualifies as an incentive stock option under the
Code will be replaced with an Adjusted Plains Option or a Spinco Option (as
applicable) which will qualify as an incentive stock option, provided, however,
that in order for incentive stock options to remain qualified and retain their
tax benefits under the Code, the adjustment formulas described below may be
required to be altered. With respect to each Plains Option that is converted to
an Adjusted Plains Option, the option price will be determined by dividing the
option price for the original Plains Option by the Plains "conversion factor,"
and the number of shares of Plains common stock subject to each Adjusted Plains
Option will be determined by multiplying the number of shares subject to the
original Plains Option by the Plains conversion factor The Plains conversion
factor will be a number equal to (1) the closing price of Plains common stock on
the New York Stock Exchange on the Distribution Date, divided by (2) the opening
price of Plains common stock on the New York Stock Exchange on the day following
the Distribution Date. With respect to each Plains Option that is converted to a
Spinco Option, the option price will be determined by dividing the option price
for the related Plains Option by the Spinco "conversion factor," and the number
of shares of Spinco common stock subject to each Spinco Option will be
determined by multiplying the number of shares subject to the related Plains
Option by the Spinco conversion factor. The Spinco conversion factor will be a
number equal to (1) the closing price of Plains common stock on the New York
Stock Exchange on the Distribution Date, divided by (2) the opening price of
Spinco common stock on the New York Common Stock on the day following the
Distribution Date.

                                       17

<PAGE>

     Section 6.02 Value and Ratio. The exercise price per share of each such
Adjusted Plains Option and each such Spinco Option will be determined such that,
immediately following the Distribution Date, the difference between the exercise
price of each option and the fair market value of the shares underlying each
option approximately equals, in the aggregate, the difference between the
exercise price of each Plains Option it replaces and the fair market value per
share of Plains Common Stock (with dividend) immediately prior to the
Distribution Date. In addition, the ratio of the exercise price of the Adjusted
Plains Options to the fair market value of Plains' Common Stock immediately
after the Distribution Date, and the ratio of the exercise price of the Spinco
Options to the fair market value of Spinco's Common Stock immediately after the
Distribution Date, will each approximately equal the ratio of the exercise price
of the Plains Option it replaces to the fair market value of Plains' Common
Stock immediately prior to the Distribution Date. Employment with Spinco will be
treated as employment with Plains for purposes of the Adjusted Plains Options,
and employment with Plains will be treated as employment with Spinco for
purposes of the Spinco Options. Other than the adjustments described in this
Section 6.02, all other terms and conditions applicable to the Plains Options
(including, but not limited to, the vesting schedule) shall remain applicable to
the Adjusted Plains Options and the Spinco Options following the Distribution
Date, and the Spinco Options shall be issued pursuant to a separate mirror
transition option plan adopted specifically for the purpose of issuing the
Spinco Options described in this Section 6.02.

                                  ARTICLE VII.
                             TRANSITION COOPERATION

     Section 7.01 Transition Services Agreements. On or about the date hereof,
Plains and Spinco shall enter into the Spinco Transition Services Agreement and
the Plains Transition Services Agreement (together, the "Transition Services
Agreements") covering the provisions of various services to be provided by
Plains to Spinco. The provisions of this Agreement shall be subject to the
provisions of such Transition Services Agreements, as applicable.

     Section 7.02 Payment of Liabilities, Plan Expenses and Related Matters.

     (a) Shared Costs. Spinco shall pay its share, as determined by Plains in
good faith, of any contributions made to any trust maintained in connection with
a Plains Plan while Spinco is a Participating Company in any such Plains Plan.

     (b) Contributions to Trusts. With respect to Plains Plans to which
employees of Spinco make contributions, Plains shall use reasonable procedures
to determine Spinco Liabilities associated with such Plans, taking into account
such contributions, settlements, refunds and similar payments.

     (c) Administrative Expenses Not Chargeable to a Trust. To the extent not
charged pursuant to this ARTICLE VII, and to the extent not otherwise agreed to
by Plains and Spinco, and to the extent not chargeable to a trust established in
connection with a Plains Plan, Spinco shall be responsible, through either
direct payment or reimbursement to Plains, for its allocable share of expenses
incurred by Plains in the administration of (i) the Plains Plans while Spinco
participates in such Plans, and (ii) the Spinco Plans, to the extent Plains
administers such Plans.

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<PAGE>

For this purpose, Spinco allocable share of such expenses shall be calculated in
accordance with current practice in effect as of the date of this Agreement.

     Section 7.03 Sharing of Participant Information. In accordance with the
applicable provisions of the Separation Agreement, Plains and Spinco shall
share, or cause to be shared, all participant information that is necessary or
appropriate for the efficient and accurate administration of each of the Plains
Plans and the Spinco Plans during the respective periods applicable to such
Plans as Spinco and Plains may mutually agree. Plains and Spinco and their
respective authorized agents shall, subject to applicable laws of
confidentiality and data protection, be given reasonable and timely access to,
and may make copies of, all information relating to the subjects of this
Agreement in the custody of the other party or its agents, to the extent
necessary or appropriate for such administration.

     Section 7.04 Reporting and Disclosure Communications to Participants. While
Spinco is a Participating Company in the Plains Plans, Plains shall take, or
cause to be taken, all actions necessary or appropriate to facilitate the
distribution of all Plains Plan-related communications and materials to
employees, participants and beneficiaries, including (without limitation)
summary plan descriptions and related summaries of material modification(s),
summary annual reports, investment information, prospectuses, notices and
enrollment material for the Plains Plans. Spinco shall provide all information
needed by Plains to facilitate such Plains Plan-related communications. Spinco
shall take, or cause to be taken, all actions necessary or appropriate to
facilitate the distribution of all Spinco Plan-related communications and
materials to employees, participants and beneficiaries. Spinco shall assist, and
Spinco shall cause each other applicable member of the Spinco Group to assist,
Plains in complying with all reporting and disclosure requirements of ERISA,
including the preparation of Form Series 5500 annual reports, for the Plains
Plans, where applicable.

     Section 7.05 Audits Regarding Vendor Contracts. From the period beginning
as of the Distribution Date or such other date as Plains and Spinco mutually
agree upon and ending on such date as Plains and Spinco may mutually agree,
Plains and Spinco and their duly authorized representatives shall have the right
to conduct joint audits with respect to any vendor contracts that relate to both
the Plains Health and Welfare Plans and the Spinco Health and Welfare Plans. The
scope of such audits shall remain consistent with the current practices and all
documents and other information currently made available for review shall
continue to be made available. Plains and Spinco shall agree on the performance
standards, audit methodology, auditing policy and quality measures, reporting
requirements, and the manner in which costs incurred in connection with such
audits will be shared.

     Section 7.06 Beneficiary Designations. Subject to Section 7.09, all
beneficiary designations made by employees of the Spinco Group for the Plains
Plans shall be transferred to and be in full force and effect under the
corresponding Spinco Plans until such time, if ever, any such beneficiary
designations are replaced or revoked by the employees of the Spinco Group who
made the beneficiary designations. All beneficiary designations made by Spinco
Retired Employees for the Spinco Plans shall be transferred to and be in full
force and effect under the corresponding Plains Plans until such time, if ever,
any such beneficiary designations are replaced or revoked by the Spinco Retired
Employees who made the beneficiary designations.

                                       19

<PAGE>

     Section 7.07 Request for IRS and DOL Opinions. Plains and Spinco shall make
such applications to regulatory agencies, including the IRS and DOL, as may be
necessary or appropriate. Spinco and Plains shall cooperate fully with one
another on any issue relating to the transactions contemplated by this Agreement
for which Plains and/or Spinco elects to seek a determination letter or private
letter ruling from the IRS or an advisory opinion from the DOL.

     Section 7.08 Fiduciary Matters. Plains and Spinco each acknowledge that
actions contemplated to be taken pursuant to this Agreement may be subject to
fiduciary duties or standards of conduct under ERISA or other applicable law,
and no party shall be deemed to be in violation of this Agreement if such party
fails to comply with any provisions hereof based upon such party's good faith
determination that to do so would violate such a fiduciary duty or standard.

     Section 7.09 Consent of Third Parties. If any provision of this Agreement
is dependent on the consent of any third party (such as a vendor) and such
consent is withheld, Plains and Spinco shall use their Reasonable Efforts to
implement the applicable provisions of this Agreement. If any provision of this
Agreement cannot be implemented due to the failure of such third party to
consent, Plains and Spinco shall negotiate in good faith to implement the
provision in a mutually satisfactory manner.

     Section 7.10 Tax Cooperation. In connection with the interpretation and
administration of this Agreement, Plains and Spinco shall take into account the
agreements and policies established pursuant to the Separation Agreement and the
Tax Allocation Agreement.

     Section 7.11 Plan Returns. Plan Returns shall be filed or caused to be
filed by Plains or Spinco as the case may be in accordance with the principles
established in the Tax Allocation Agreement. For purposes of this Section 7.11,
"Plan Returns" means any return, report, certificate, form or similar statement
or document required to be filed with a government agency with respect to an
employee benefit plan governed by the ERISA, or a program governed by Section
6039D of the Code.

                                  ARTICLE VIII.
                           EMPLOYMENT-RELATED MATTERS

     Section 8.01 Terms of Spinco Employment. Nothing in the Separation
Agreement, this Agreement, or any Ancillary Agreement should be construed to
change the at-will status of any of the employees of any member of the Plains
Group or the Spinco Group.

     Section 8.02 HR Data Support Systems. Plains shall provide human resources
data support for employees of the members of the Spinco Group in accordance with
the terms of the Spinco Transition Services Agreement.

     Section 8.03 Employment of Employees with U.S. Work Visas. Spinco will
comply with all immigration laws and regulations of the Unites States of America
as such laws and regulations applied to employees of any member of the Plains
Group in the United States of America pursuant to a work or training visa
regardless of visa category. Spinco expressly assumes all obligations,
liabilities and undertakings arising from or under attestations made in

                                       20

<PAGE>

each certified and effective Labor Condition Application filed by Plains. Spinco
shall file amended petitions with the Immigration and Naturalization Service, as
may be necessary or appropriate. In such cases, the foreign national employee
will remain employed by a member of the Plains Group and continue to participate
in the Plains Plans until such amended petitions have been approved.

     Section 8.04 Confidentiality and Proprietary Information.

     (a) No Release. No provision of the Separation Agreement or any Ancillary
Agreement shall be deemed to release any individual for any violation of the
Plains non-competition guideline or any agreement or policy pertaining to
confidential or proprietary information of any member of the Plains Group or
Spinco Group, or otherwise relieve any individual of his or her obligations
under such non-competition guideline, agreement, or policy.

     (b) Employee Agreements. As used in this Section 8.04(b), "Employee
Agreement" means any confidentiality agreement, non-compete, non-solicitation
and any similar agreements executed by Plains or Spinco employees in connection
with their employment. Nothing in this Agreement, the Separation Agreement or
any other Ancillary Agreement shall be deemed to supercede any provision
regarding the conduct of employees mandated by the Federal Energy Regulatory
Commission or any other applicable regulatory authority.

          (i) Survival of Plains Employee Agreement Obligations and Plains'
     Common Law Rights. The Plains Employee Agreements of all Spinco Employees
     and all former Plains employees transferred to Spinco on or before the
     Distribution Date shall remain in full force and effect according to their
     terms. Notwithstanding the foregoing to the contrary, none of the following
     acts committed by former Plains or Spinco employees within the scope of
     their Spinco employment shall constitute a breach of such Plains Employee
     Agreements: (i) the use or disclosure of confidential information for or on
     behalf of Spinco, if such disclosure is consistent with the assignment or
     license of rights, businesses and assets granted to Spinco and restrictions
     imposed on Spinco under the Separation Agreement, any other Ancillary
     Agreement or any other agreement between the parties, and (ii) the
     rendering of any services, directly or indirectly, to Spinco to the extent
     such services are consistent with the assignment or license of rights,
     businesses and assets granted to Spinco and the restrictions imposed on
     Spinco under the Separation Agreement, any other Ancillary Agreement or any
     other agreement between the parties. Further, Plains retains any rights it
     has under statute or common law with respect to actions by its former
     employees to the extent such actions are inconsistent with the assignment
     or license of rights, businesses and assets granted to Spinco and
     restrictions imposed on Spinco under the Separation Agreement, any other
     Ancillary Agreement or any other agreement between the parties.

          (ii) Survival of Spinco Employee Agreement Obligations and Spinco
     Common Law Rights. The Spinco Employee Agreements of all Plains Employees
     and all former Spinco employees transferred to Plains on or before the
     Distribution Date shall remain in full force and effect according to their
     terms; provided, however, that none of the following acts committed by
     former Spinco or Plains employees within the scope of their Plains
     employment shall constitute a breach of such Spinco Employee Agreements:

                                       21

<PAGE>

     (i) the use or disclosure of Confidential Information (as that term is
     defined in the Plains Employee Agreement) for or on behalf of Plains, if
     such disclosure is consistent with the rights, businesses and assets
     retained by Plains and restrictions imposed on Plains under the Separation
     Agreement, any other Ancillary Agreement or any other agreement between the
     parties, and (ii) the rendering of any services, directly or indirectly, to
     Plains to the extent such services are consistent with the rights,
     businesses and assets retained by Plains and the restrictions imposed on
     Plains under the Separation Agreement, any other Ancillary Agreement or any
     other agreement between the parties. Further, Spinco retains any rights it
     has under statute or common law with respect to actions by its former
     employees to the extent such actions are inconsistent with the rights,
     businesses and assets retained by Plains and restrictions imposed on Plains
     under the Separation Agreement, any other Ancillary Agreement or any other
     agreement between the parties.

          (iii) Assignment, Cooperation for Compliance and Enforcement.

               (A)  (1) Plains retains all rights under the Plains Employee
               Agreements of all former Plains employees necessary to permit
               Plains to protect the rights and interests of Plains, but hereby
               transfers and assigns to Spinco its rights under the Plains
               Employee Agreements of all former Plains employees to the extent
               required to permit Spinco to enjoin, restrain or recover damages
               from the Plains Employee Agreements or obtain other remedies
               against any employee who breaches his or her Plains Employee
               Agreement, and to the extent necessary to permit Spinco to
               protect its rights and interests.

                    (2) Plains and Spinco agree, at their own respective cost
               and expense, to use their reasonable efforts to cooperate as
               follows: (A) Spinco shall advise Plains of: (1) any violation(s)
               of the Plains Employee Agreements by Spinco or former Plains
               employees, and (2) any violation(s) of the Spinco Employee
               Agreements which affect Plains' rights; and (B) Plains shall
               advise Spinco of any violation(s) of the Plains Employee
               Agreements by current or former Plains employees which affect
               Spinco's rights; provided, however, that the foregoing
               obligations shall only apply to violation(s) which become known
               to an attorney within the legal department of the party obligated
               to provide notice thereof.

                    (3) Plains and Spinco each may separately enforce the Plains
               Employee Agreements of Spinco and former Plains employees to the
               extent necessary to reasonably protect their respective
               interests, provided, however, that (i) Spinco shall not commence
               any litigation relating thereto without first consulting with
               Plains' General Counsel or his or her designee and (ii) Plains
               shall not commence any litigation relating thereto against any
               former Plains employee who is at the time an employee of the
               Spinco Group without first consulting with Spinco's General
               Counsel or his or her designee. If either party, in seeking to
               enforce any Plains Employee Agreement, notifies the other party
               that it requires, or desires, the other party to join in such
               action, then the other party shall do so. In

                                       22

<PAGE>

               addition, if either party commences or becomes a party to any
               action to enforce a Plains Employee Agreement of an employee of
               the Spinco Group or former Plains employee, the other party
               shall, whether or not it becomes a party to the action, cooperate
               with the other party by making available its files and employees
               who have information or knowledge relevant to the dispute,
               subject to appropriate measures to protect the confidentiality of
               any proprietary or confidential information that may be disclosed
               in the course of such cooperation or action and subject to any
               relevant privacy laws and regulations. Any such action shall be
               conducted at the expense of the party bringing the action and the
               parties shall agree on a case by case basis on compensation, if
               any, of the other party for the value of the time of such other
               party's employees as reasonably required in connection with the
               action.

               (B)  (1) Spinco retains all rights under the Spinco Employee
               Agreements of all former Spinco employees necessary to permit
               Spinco to protect the rights and interests of Spinco, but hereby
               transfers and assigns to Plains its rights under the Spinco
               Employee Agreements of all former Spinco employees to the extent
               required to permit Plains to enjoin, restrain or recover damages
               from the Spinco Employee Agreements or obtain other remedies
               against any employee who breaches his or her Spinco Employee
               Agreement, and to the extent necessary to permit Plains to
               protect its rights and interests.

                    (2) Plains and Spinco agree, at their own respective cost
               and expense, to use their reasonable efforts to cooperate as
               follows: (A) Plains shall advise Spinco of: (1) any violation(s)
               of the Spinco Employee Agreements by Plains or former Spinco
               employees, and (2) any violation(s) of the Plains Employee
               Agreements which affect Spinco's rights; and (B) Spinco shall
               advise Plains of any violations of the Spinco Employee Agreements
               by current or former Spinco employees which affect Plains'
               rights; provided, however, that the foregoing obligations shall
               only apply to violations which become known to an attorney within
               the legal department of the party obligated to provide notice
               thereof.

                    (3) Plains and Spinco each may separately enforce the Plains
               Employee Agreements of Plains and former Spinco employees to the
               extent necessary to reasonably protect their respective
               interests, provided, however, that (i) Plains shall not commence
               any litigation relating thereto without first consulting with
               Spinco's General Counsel or his or her designee and (ii) Spinco
               shall not commence any litigation relating thereto against any
               former Spinco employee who is at the time a Plains Employee
               without first consulting with Plains' General Counsel or his or
               her designee. If either party, in seeking to enforce any Spinco
               Employee Agreement, notifies the other party that it requires, or
               desires, the other party to join in such action, then the other
               party shall do so. In addition, if either party commences or
               becomes a party to any action to enforce a

                                       23

<PAGE>

               Spinco Employee Agreement of a Plains Employee or former Spinco
               employee, the other party shall, whether or not it becomes a
               party to the action, cooperate with the other party by making
               available its files and employees who have information or
               knowledge relevant to the dispute, subject to appropriate
               measures to protect the confidentiality of any proprietary or
               confidential information that may be disclosed in the course of
               such cooperation or action and subject to any relevant privacy
               laws and regulations. Any such action shall be conducted at the
               expense of the party bringing the action and the parties shall
               agree on a case by case basis on compensation, if any, of the
               other party for the value of the time of such other party's
               employees as reasonably required in connection with the action.

               (C) Plains and Spinco understand and acknowledge that matters
          relating to the making, enforcement, assignment and termination of
          employee agreements are typically governed by the laws and regulations
          of the national, federal, state or local governmental unit where an
          employee resides, or where an employee's services are rendered, and
          that such laws and regulations may supersede or limit the
          applicability or enforceability of this Section 8.04. In such
          circumstances, Plains and Spinco agree to take action with respect to
          the employee agreements that best accomplishes the parties' objectives
          as set forth in this Section 8.04 and that is consistent with
          applicable law.

     Section 8.05 Accrued Payroll, Bonuses, Profit Sharing and Commissions.
Except as otherwise specified in an Ancillary Agreement, Spinco shall be
responsible for all Liabilities relating to, arising out of, or attributable to
payroll, bonuses, profit sharing and commissions accrued by employees employed
by Spinco through the Distribution Date. Plains and Spinco shall agree on the
manner and method of payment for all payroll, bonuses, profit sharing and
commissions agreed to on behalf of employees who have been employed by Spinco on
or before the Distribution Date. Plains shall provide or cause to be provided to
Spinco in the same manner as in effect on the date of this Agreement all payroll
services as required in the Spinco Transition Services Agreement.

     Section 8.06 Payroll and Withholding.

     (a) Income Reporting, Withholding. Plains shall perform in the same manner
as in effect on the date of this Agreement the income reporting and withholding
function under Spinco's employer identification number for employees of the
Spinco Group and other service providers as required by the Spinco Transition
Services Agreement.

     (b) Delivery of, and Access to, Documents and Other Information.
Concurrently with the Distribution Date, Plains shall cause to be delivered to
Spinco, the employee information set forth on all IRS Forms W-4 executed by
Plains Employees designated as Spinco Employees as of the Distribution Date. For
the period ending on the Distribution Date (and for such additional period as
Plains and Spinco may mutually agree), Plains shall make reasonably available to
Spinco all forms, documents or information, no matter in what format stored,
relating to compensation or payments made to any employee or service provider of
Spinco. Such

                                       24

<PAGE>

information may include, but is not limited to, information concerning employee
payroll deductions, payroll adjustments, records of time worked, tax records
(e.g., IRS Forms W-2, W-4, 940 and 941), and information concerning garnishment
of wages or other payments.

     (c) Consistency of Tax Positions; Duplication. Plains and Spinco shall
individually and collectively make commercially reasonable best efforts to avoid
unnecessarily duplicated federal, state or local payroll taxes, insurance or
workers' compensation contributions, or unemployment contributions arising on or
after the Distribution Date. Plains and Spinco shall take consistent reporting
and withholding positions with respect to any such taxes or contributions.

     Section 8.07 Personal and Pay Records. For the period beginning on the date
of this Agreement and ending on the Distribution Date (and for such additional
period as Plains and Spinco may mutually agree), Plains shall make reasonably
available to Spinco for review and reproduction, subject to applicable laws on
confidentiality and data protection, all current and historic forms, documents
or information, no matter in what format stored, relating to pre-Distribution
Date personnel and medical records. Such forms, documents or information may
include, but is not limited to: (a) information regarding ranking or promotions
of employees of the Spinco Group; (b) the existence and nature of garnishment
orders or other judicial or administrative actions or orders affecting an
employee's or service provider's compensation; and (c) performance evaluations.

     Section 8.08 Non-Termination of Employment; No Third-Party Beneficiaries.
No provision of this Agreement, the Separation Agreement, or any Ancillary
Agreement shall be construed to create any right, or accelerate entitlement, to
any compensation or benefit whatsoever on the part of any Spinco Employee or
other future, present or former employee of Plains or Spinco under any Plains
Plan or Spinco Plan or otherwise. Without limiting the generality of the
foregoing: (a) except as otherwise provided in this agreement or applicable
provisions of Plans, neither the Distribution nor the termination of the
Participating Company status of Spinco or any member of the Spinco Group shall
cause any employee to be deemed to have incurred a termination of employment;
and (b) no transfer of employment between Plains and Spinco before the
Distribution Date shall be deemed a termination of employment for any purpose
hereunder.

                                   ARTICLE IX.
                                  MISCELLANEOUS

     Section 9.01 Entire Agreement. This Agreement, the Separation Agreement,
the other Ancillary Agreements and the Exhibits and Schedules referenced or
attached hereto and thereto, constitute the entire agreement between the Parties
with respect to the subject matter hereof and shall supersede all prior written
and oral and all contemporaneous oral agreements and understandings with respect
to the subject matter hereof.

     Section 9.02 Governing Law. This Agreement shall be governed by and
construed in accordance with the laws of the State of Texas without regard to
its principles of conflicts of law.

                                       25

<PAGE>

     Section 9.03 Notices. Unless expressly provided herein, all notices,
claims, certificates, requests, demands and other communications hereunder shall
be in writing and shall be deemed to be duly given (i) when personally delivered
or (ii) if mailed registered or certified mail, postage prepaid, return receipt
requested, on the date the return receipt is executed or the letter refused by
the addressee or its agent or (iii) if sent by overnight courier which delivers
only upon the signed receipt of the addressee, on the date the receipt
acknowledgment is executed or refused by the addressee or its agent or (iv) if
sent by facsimile on the date confirmation of transmission is received (provided
that a copy of any notice delivered pursuant to this clause (iv) shall also be
sent pursuant to clause (ii) or (iii)), addressed to the attention of the
addressee's Chief Executive Officer at the address of its principal executive
office or to such other address or facsimile number for a party as it shall have
specified by like notice.

     Section 9.04 Counterparts. This Agreement may be executed in counterparts,
each of which shall be deemed to be an original but all of which shall
constitute one and the same agreement.

     Section 9.05 Binding Effect; Assignment. This Agreement shall inure to the
benefit of and be binding upon the Parties and their respective legal
representatives and successors and nothing in this Agreement, express or
implied, is intended to confer upon any other Person any rights or remedies of
any nature whatsoever under or by reason of this Agreement. This Agreement may
not be assigned by any Party without the prior written consent of the other
Party, which may be withheld for any or no reason.

     Section 9.06 Severability. The provisions of this Agreement will be deemed
severable and the invalidity or unenforceability of any provision will not
affect the validity or enforceability of the other provisions hereof; provided
that if any provision of this Agreement, as applied to any Party or to any
circumstance, is adjudged by a Governmental Authority, arbitrator, or mediator
not to be enforceable in accordance with its terms, the Parties agree that the
Governmental Authority, arbitrator or mediator making such determination will
have the power to modify the provision in a manner consistent with its
objectives such that it is enforceable, and/or to delete specific words or
phrases, and in its reduced form, such provision will then be enforceable and
will be enforced.

     Section 9.07 Failure or Indulgence not Waiver; Remedies Cumulative. No
failure or delay on the part of either Party in the exercise of any right
hereunder shall impair such right or be construed to be a waiver of, or
acquiescence in, any breach of any representation, warranty or agreement herein,
nor shall any single or partial exercise of any such right preclude other or
further exercise thereof or of any other right. All rights and remedies existing
under this Agreement are cumulative to, and not exclusive of, any rights or
remedies otherwise available.

     Section 9.08 Waivers, Modifications, Amendments. No provision of this
Agreement may be amended, modified or waived except in the manner set forth in
the Separation Agreement.

                                       26

<PAGE>

     Section 9.09 Headings. The heading references herein are for convenience
purposes only, do not constitute a part of this Agreement and shall not be
deemed to limit or affect any of the provisions hereof.

     Section 9.10 Relationship of Parties. Nothing in this Agreement shall be
deemed or construed by the Parties or any third party as creating the
relationship of principal and agent, partnership or joint venture between the
Parties, and no provision contained herein, and no act of the Parties, shall be
deemed to create any relationship between the Parties other than the
relationship set forth herein nor be deemed to vest any rights, interests or
claims in any third parties.

     Section 9.11 Provisions Unaffected. Nothing contained in this Agreement
shall affect the rights and obligations of Plains and Spinco under the
Separation Agreement.

     Section 9.12 No Third-Party Beneficiaries. This Agreement is solely for the
benefit of the parties hereto and should not be deemed to confer upon third
parties any remedy, claim, liability, reimbursement, claim of action or other
right in excess of those existing without reference to this Agreement.

     Section 9.13 Rights of the Parties. Nothing expressed or implied in this
Agreement is intended or will be construed to confer upon or give any Person,
other than the Parties and to the extent provided herein their respective
Subsidiaries, any rights or remedies under or by reason of this Agreement or any
transaction contemplated thereby.

     Section 9.14 Effect if IPO and/or Distribution does not Occur. Subject to
Section 9.17, if the IPO and/or Distribution does not occur, then all actions
and events that are, under this Agreement, to be taken or occur effective as of
the IPO Closing Date, and/or Distribution Date, or otherwise in connection with
the IPO and/or Distribution, shall not be taken or occur except to the extent
specifically agreed by Spinco and Plains.

     Section 9.15 Affiliated Companies. Each of Plains and Spinco shall cause to
be performed, and hereby guarantee the performance of, any and all actions of
any and all members of the Plains Group or the Spinco Group, respectively.

     Section 9.16 Incorporation of Separation Agreement Provisions. If a
dispute, claim or controversy results from or arises out of or in connection
with this Agreement, the parties agree to use the procedures set forth in
Article VIII of the Separation Agreement in lieu of other available remedies, to
resolve the same. The provisions of Article VIII (Arbitration; Dispute
Resolution), and Sections 6.2 (Issuance of Stock), 9.2 (Further Instruments),
9.5 (Auditors and Audits, Annual and Quarterly Statements and Accounting), 9.7
(Governmental Approvals), 11.1 (Limitation of Liability) and 11.11 (Authority)
of the Separation Agreement are hereby incorporated herein by reference, and
unless otherwise expressly specified herein, such provisions shall apply as if
fully set forth herein (references in this Section 9.16 to an "Article" or
"Section" shall mean Articles or Sections of the Separation Agreement, and,
except as expressly set forth herein, references in the material incorporated
herein by reference shall be references to the Separation Agreement).

                                       27

<PAGE>

     Section 9.17 Termination. This Agreement may be terminated and the
Distribution abandoned at any time prior to the IPO Closing Date by Plains in
its sole discretion. This Agreement may be terminated at any time after the IPO
Closing Date and before the Distribution Date by mutual consent of Plains and
Spinco. In the event of termination pursuant to this Section, no party shall
have any liability of any kind under this Agreement to the other party.

     Section 9.18 Conflict. In the event of any conflict between the provisions
of this Agreement and the Separation Agreement, any Ancillary Agreement, or
Plan, the provisions of this Agreement shall control.

                           - SIGNATURE PAGE FOLLOWS -

                                       28

<PAGE>

     IN WITNESS WHEREOF, each of the parties have caused this Employee Matters
Agreement to be executed on its behalf by its officers thereunto duly authorized
on the day and year first above written.

                                PLAINS RESOURCES INC.

                                By:    /s/ Jere C. Overdyke, Jr.
                                       -----------------------------------------
                                Name:  Jere C. Overdyke, Jr.
                                Title: Vice President and Treasurer

                                PLAINS EXPLORATION & PRODUCTION
                                COMPANY, L.P.

                                By:    Stocker Resources, Inc., its sole general
                                       partner

                                       By:    /s/ Jere C. Overdyke, Jr.
                                              ----------------------------------
                                       Name:  Jere C. Overdyke, Jr.
                                       Title: Vice President and Treasurer

                                       29<PAGE>

                                                                    EXHIBIT 10.4

                            TAX ALLOCATION AGREEMENT

                                 by and between

                              PLAINS RESOURCES INC.

                                       and

                  PLAINS EXPLORATION & PRODUCTION COMPANY, L.P.

                                  July 3, 2002

<PAGE>

                                TABLE OF CONTENTS

                                                                            Page

1.    Spinco Group............................................................2

2.    Tax Returns.............................................................2

3.    Obligation for Payment of Taxes.........................................4

4.    No Plains Tax Payments..................................................5

5.    Spinco Tax Payments.....................................................5

6.    Tax Benefits Before Spin-Off; Deferred Intercompany Gains...............7

7.    Spinco Tax Benefits After Spin-Off; No Payment by Spinco................7

8.    Tax Audits..............................................................8

9.    Proposed Adjustments....................................................8

10.   Notice of Settlement or Compromise......................................9

11.   Spinco's Right to Contest...............................................9

12.   Subsequent Adjustments or Refunds......................................10

13.   Spinco Spin-Off Tax Indemnity..........................................11

14.   Future Actions.........................................................12

15.   Combined, Consolidated or Unitary Basis Returns........................13

16.   Earnings and Profits Information.......................................13

17.   Tax Interpretation.....................................................13

18.   Consistent Tax Treatment...............................................14

19.   Retention of Records...................................................14

20.   Post Spin-Off Period Taxes.............................................14

21.   Expenses...............................................................15

22.   Definitions............................................................15

      (a)   "After-Tax Basis"................................................15

      (b)   "Agreed Rate"....................................................15

      (c)   "Code"...........................................................15

      (d)   "Conversion".....................................................15

      (e)   "Converted Corporation"..........................................15

      (f)   "Distribution Agreement".........................................16

      (g)   "Items of Loss or Tax Benefit"...................................16

      (h)   "Interim Period".................................................16

                                       -i-

<PAGE>

                                TABLE OF CONTENTS
                                   (continued)

                                                                            Page

      (i)   "Plains".........................................................16

      (j)   "Plains Group"...................................................16

      (k)   "Returns"........................................................16

      (l)   "Ruling".........................................................16

      (m)   "Short Period"...................................................16

      (n)   "Spinco".........................................................16

      (o)   "Spinco Group"...................................................16

      (p)   "Spin-Off".......................................................16

      (q)   "Spin-Off Date"..................................................16

      (r)   "Spin-Off Tax"...................................................17

      (s)   "Stocker Inc."...................................................17

      (t)   "Tax Authority"..................................................17

      (u)   "Taxes"..........................................................17

      (v)   "Transfer Tax"...................................................18

23.   Notices................................................................18

24.   Binding Effect; Successors.............................................18

25.   Severability...........................................................19

26.   Entire Agreement.......................................................19

27.   Governing Law..........................................................20

28.   Arbitration............................................................20

                                      -ii-

<PAGE>

                            TAX ALLOCATION AGREEMENT

     THIS TAX ALLOCATION AGREEMENT, made and entered into as of the __day of
July, 2002, by and between Plains Resources Inc., a Delaware corporation
("Plains"), and Plains Exploration & Production Company, L.P., a California
limited partnership ("Plains E&P").

                              W I T N E S S E T H:

     WHEREAS, Plains is the common parent of an affiliated group of corporations
(hereinafter referred to as the "Plains Group") within the meaning of Section
1504(a) of the Internal Revenue Code of 1986, as amended (the "Code"), and the
members of the Plains Group have heretofore joined in filing consolidated
Federal income Tax Returns;

     WHEREAS, on or about the date hereof, certain assets associated with the
upstream business conducted by the Plains Group, including the stock of certain
subsidiaries included in the Plains Group and engaged in the upstream business,
will be contributed to the capital of Spinco or otherwise acquired by Spinco or
one or more of its subsidiaries;

     WHEREAS, Plains and Stocker Resources, Inc., the sole general partner of
Plains E&P ("Stocker Inc."), currently contemplate that Plains E&P will
(collectively, the "Conversion") (1) convert from a California limited
partnership to a Delaware limited partnership and immediately thereafter (2)
convert from a Delaware limited partnership to a Delaware corporation (such
corporation, the "Converted Corporation)";

     WHEREAS, Plains, on a date to be determined by Plains (the "Spin-Off
Date"), will distribute to its stockholders all of the outstanding stock of
Spinco that it then holds (the "Spin-Off"), and thereafter Spinco and its
subsidiaries will no longer be members of the Plains Group for Federal income
Tax purposes; and

<PAGE>

     WHEREAS, the parties desire to provide for the sharing of the Federal,
state, local and foreign income Tax liabilities and benefits accrued prior to
the Spin-Off between Plains and its subsidiaries and Spinco and its
subsidiaries;

     NOW, THEREFORE, the parties hereto agree as follows:

     1. Spinco Group. For purposes of this Agreement, the "Spinco Group" shall
mean (i) Spinco, (ii) Spinco's subsidiaries, and (iii) those corporations and
other entities whose stock or ownership interests will be contributed to Spinco
prior to the Spin-Off Date, all of such subsidiaries of Spinco and such
corporations and other entities being listed on Exhibit A attached hereto.
Unless otherwise specified, whenever items of income, gain, loss, deduction,
credit, or other Tax attributes of Spinco are referred to in this Agreement
(hereinafter "Items of Loss or Tax Benefit"), the reference shall be to the
collective amounts of such items for the Spinco Group.

     2. Tax Returns. Plains shall prepare and file or cause to be prepared and
filed timely all appropriate Returns in respect of Spinco and the other members
of the Spinco Group that (i) are required to be filed on or before the Spin-Off
Date; or (ii) are required to be filed after the Spin-Off Date that (A) are
required to include, on a consolidated, combined or unitary basis, the
operations of Spinco or any other member of the Spinco Group for any Tax period
or portion thereof ending on or before the Spin-Off Date; or (B) are required to
be filed by Spinco or any other member of the Spinco Group on a separate return
basis for any Tax period ending on or before the Spin-Off Date. To the extent
requested by Plains, Spinco shall participate in the filing of and shall file
any required Returns with respect to any Tax period that ends on or before the
Spin-Off Date. Spinco shall prepare or cause to be prepared the schedules in
respect of Spinco and other members of the Spinco Group containing the
information necessary for Plains to

                                      -2-

<PAGE>

prepare any consolidated, combined or unitary Returns. If Plains, after
consulting with Spinco, files any such consolidated, combined or unitary Return
using information with respect to Spinco and the other members of the Spinco
Group that is different from the information prepared and furnished by Spinco,
and Plains and Spinco thereafter are unable to resolve such difference, such
difference shall constitute a claim for purposes of Paragraph 28 of this
Agreement. Spinco shall also prepare or cause to be prepared and shall file or
cause to be filed all other Returns required of Spinco or any other members of
the Spinco Group, or in respect of its or any of their activities, for any Tax
period ending after the Spin-Off Date that includes the operations of Spinco or
any other member of the Spinco Group prior to the Spin-Off Date. The parties
hereto will, to the extent permitted by applicable law, elect with the relevant
Tax Authority to treat for all purposes the Spin-Off Date as the last day of a
Tax period of Spinco and the other members of the Spinco Group, and such period
shall be treated as a "Short Period" for purposes of this Agreement. In any case
where applicable law does not permit Spinco to treat the Spin-Off Date as the
last day of a Short Period, then for purposes of this Agreement, the portion of
such Taxes that is attributable to the operations of Spinco and the other
members of the Spinco Group for such Interim Period (as defined below) shall be
(i) in the case of Taxes that are not based in whole or in part on income or
gross receipts, the total amount of such Taxes for the period in question
multiplied by a fraction, the numerator of which is the number of days in the
Interim Period, and the denominator of which is the total number of days in the
entire period in question, and (ii) in the case of Taxes that are based in whole
or in part on income or gross receipts, the Taxes that would be due with respect
to the Interim Period, if such Interim Period were a Short Period. "Interim
Period" means with respect to any Taxes imposed on Spinco or any other members
of the Spinco Group for which the Spin-Off Date is not the last day of a Short
Period,

                                      -3-

<PAGE>

the period of time beginning on the first day of the actual Tax period that
includes (but does not end on) the Spin-Off Date and ending on and including the
Spin-Off Date. Any franchise Tax shall be allocated to the Tax period or portion
thereof during which the right to do business obtained by the payment of such
franchise Tax relates, regardless of whether such franchise Tax is measured by
income, operations, assets or capital relating to another Tax period.

     3. Obligation for Payment of Taxes. Plains shall be entitled to receive
from Spinco amounts calculated in accordance with Paragraphs 5, 12 and 13
hereof. Except as otherwise provided in Paragraph 5, the amounts, if any, that
Spinco shall be obligated to pay Plains pursuant to Paragraph 5, with respect to
Tax periods of the Plains Group ending on or prior to the Spin-Off Date, shall
be paid (i) within 30 days after the Spin-Off Date where the Taxes were paid by
Plains on or before the Spin-Off Date and shall include interest thereon
calculated for the period from the Spin-Off Date to the date of payment at a per
annum rate of interest (computed on the basis of the actual number of days
elapsed (including the Spin-Off Date but excluding the payment date) over a year
of 365 or 366 days, as the case may be) equal to the underpayment rate under
Section 6601 of the Code, or (ii) within 30 days after the date of payment where
the Taxes are paid by Plains after the Spin-Off Date. This initial settlement
shall be based on the Returns as they have been filed and shall include any
amendments of or adjustments to such Returns that have been finally settled.
Except as otherwise provided in Paragraph 5, any amounts that Spinco shall be
obligated to pay Plains pursuant to Paragraph 5 with respect to Tax periods of
the Plains Group ending after the Spin-Off Date shall be paid within 30 days
after filing of the Returns for such Tax periods. In the event of an adjustment
to the amount of payment for any Tax period as determined under Paragraph 12,
Plains shall be entitled to receive from Spinco such payment within 30 days
after payment of a deficiency to or receipt of a refund

                                      -4-

<PAGE>

from the Tax Authority. In the event of an adjustment under Paragraph 12
resulting in no additional payment to or receipt of a refund from the Tax
Authority, settlement shall be made within 30 days after filing of the amended
Return or final settlement of the adjustment. In the event that Spinco is
delinquent in paying to Plains any amount due pursuant to this Paragraph 3,
including any interest accrued thereon pursuant to this Paragraph 3, such unpaid
amount shall bear interest from the original due date until paid at a per annum
rate equal to the lesser of (a) 18 percent and (b) the maximum lawful
non-usurious rate of interest, if any, which under applicable law Plains is
permitted to charge Spinco thereon from time to time.

     4. No Plains Tax Payments. Notwithstanding any other provision of this
Agreement to the contrary, Plains shall not be obligated to pay Spinco for any
Items of Loss or Tax Benefit of the Spinco Group used by the Plains Group to
reduce its Federal income Tax liability or Federal taxable income for any Tax
period ending on or before the Spin-Off Date. For purposes of these
computations, the allocation of Tax attributes to the Spinco Group and
absorption thereof by the Plains Group for each Tax period shall be determined
in accordance with the Treasury Regulations under (S) 1502 of the Code, applied
in a manner consistent with practices and methods followed in reporting the
Federal income Tax liability of the Plains Group for such Tax periods. In any
instance where a Tax attribute must be characterized, the characterization
prescribed by the aforementioned Treasury Regulations will control.

     5. Spinco Tax Payments. For each Tax period of the Plains Group which
includes income of the Spinco Group, Spinco shall be obligated to pay Plains an
amount equal to the product of (i) the net taxable income of the Spinco Group
included in the consolidated Federal income Tax Return of the Plains Group for
such period, multiplied by (ii) the highest marginal statutory Federal corporate
income Tax rate applicable to such income for such period; provided,

                                      -5-

<PAGE>

however, that no payment shall be required pursuant to this Paragraph 5 to the
extent such payments have previously been made by the Spinco Group to members of
the Plains Group other than the Spinco Group under any Tax sharing agreement or
arrangement (whether written or oral) or any other similar system of payments
with respect to Federal income Taxes of the Plains Group in existence prior to
the Spin-Off Date, including, but not limited to, any estimated Tax payments.
For purposes of these computations, the allocation of Tax attributes to the
Plains Group and absorption thereof by the Spinco Group for each Tax period
shall be determined in accordance with the Treasury Regulations under (S)1502 of
the Code, applied in a manner consistent with practices and methods followed in
reporting the Federal income Tax liability of the Plains Group for such Tax
periods. In any instance where a Tax attribute must be characterized, the
characterization prescribed by the aforementioned Treasury Regulations will
control. To the extent, if any, that the amount of Taxes Plains is required to
pay for a Tax period that includes any net taxable income of the Spinco Group is
less than the amount calculated as owed by Spinco to Plains under this Paragraph
5, the amount owed by Spinco to Plains shall be (i) reduced to the extent that
such difference is attributable to Items of Loss or Tax Benefit of the Plains
Group used which would have otherwise expired unused but for the fact that the
Spinco Group had net taxable income for such Tax period, or (ii) deferred to the
extent such difference is attributable to Items of Loss or Tax Benefit of the
Plains Group used which would have otherwise carried forward to a subsequent
year or years but for the fact that the Spinco Group had net taxable income for
such Tax period. In the event an amount otherwise payable by Spinco to Plains is
deferred pursuant to clause (ii) of the immediately preceding sentence, such
amount shall be paid by Spinco to Plains within 30 days after the filing of the
Tax Return for the Tax period in which such Tax benefits of the Plains Group
previously used would have been

                                      -6-

<PAGE>

used. Any amount payable by Spinco to Plains pursuant to the immediately
preceding sentence shall not be greater than the amount of Tax paid by Plains as
a consequence of the Tax benefits of the Plains Group previously having been
used to offset taxable income of the Spinco Group.

     6. Tax Benefits Before Spin-Off; Deferred Intercompany Gains. For purposes
of the calculations under Paragraphs 5, 12 and 13 of this Agreement, any loss of
or decrease in any Items of Loss or Tax Benefit resulting from or attributable
to the transfer of assets to Spinco or any other member of the Spinco Group in
connection with the Spin-Off (under the Treasury Regulations governing Federal
consolidated returns) shall be ignored and all calculations shall be made as
though all such Items of Loss or Tax Benefit were available for use by the
Plains Group. In the event any deferred intercompany gain attributable to assets
transferred to Spinco or any other members of the Spinco Group by other members
of the Plains Group is recognized by the Plains Group by reason of the Spin-Off,
such deferred intercompany gain, if any, shall be deemed to be a gain of the
Spinco Group for its taxable year ending on the Spin-Off Date for purposes of
all calculations under this Agreement, including the calculation of Taxes owed
by Spinco to Plains pursuant to Paragraphs 3, 5, 12 and 13 hereof.
Notwithstanding anything in this Agreement to the contrary, with respect to any
items of income or gain resulting from an acceleration of an excess loss account
prior to or on the Spin-Off Date, Spinco shall not be liable to Plains for Taxes
or the use of Items of Loss or Tax Benefit resulting from those items of income
or gain.

     7. Spinco Tax Benefits After Spin-Off; No Payment by Spinco.
Notwithstanding anything in this Agreement to the contrary, with respect to
items of loss or other Tax benefits apportioned to and carried over by the
Spinco Group after the Spin-Off (under the Treasury Regulations governing
Federal consolidated income Tax Returns) and regardless of whether such

                                      -7-

<PAGE>

Tax benefits (x) are used by the Spinco Group to reduce its Federal income Tax
liability after the Spin-Off or (y) expire unused by the Spinco Group, Spinco
shall not have any obligation to pay Plains for any such item of loss or other
Tax benefit.

     8. Tax Audits. In the event of an audit by any Tax Authority of a Return
filed by Plains for any Tax period ending prior to or on the Spin-Off Date (or
any Tax period thereafter in which a carryforward of the Spinco Group's Tax
benefits is used), Plains shall give Spinco timely and reasonable notice of such
audit proceedings and Spinco shall have the right to participate in any such
audit; provided, however, that Plains shall have the full power and authority to
control such audit. In connection with any such audit, Spinco will provide all
necessary information and other assistance reasonably requested by Plains with
respect to issues concerning the activities of the Spinco Group. All
communications with any such Tax Authority and its employees concerning any such
audit will be made by Plains unless otherwise agreed between the parties hereto.
In connection with its participation in any audit, Spinco shall be given
reasonable notice of all material meetings, investigations, field examinations
and similar events and copies of all relevant material correspondence between
the Tax Authority conducting the audit and Plains.

     9. Proposed Adjustments. Plains shall give prompt notice to Spinco of any
adjustment or adjustments proposed by any Tax Authority relating to the
activities of the Spinco Group for any Tax period ending prior to or on the
Spin-Off Date. After consulting with Spinco, Plains shall determine in its sole
discretion the nature of all action to be taken to contest such proposed
adjustment, including whether any such action shall initially be contested by
way of judicial or administrative proceedings, or both, whether any such
proposed adjustment shall be contested by resisting payment thereof or by paying
the same and seeking a refund thereof, and if

                                      -8-

<PAGE>

Plains shall undertake to contest such proposed adjustment, the court or other
judicial body before which such action will be commenced. Plains shall have full
control over any contest or administrative proceeding pursuant to this
Paragraph, but Spinco, at its expense and subject to approval by Plains, which
approval shall not be unreasonably withheld, may participate in any proceedings
contesting any proposed adjustment relating to the activities of the Spinco
Group.

     10. Notice of Settlement or Compromise. Plains shall give prompt notice to
Spinco of any proposal made to it at the time of an audit or otherwise, to
settle or compromise issues relating to the Tax liabilities of the Spinco Group
for any Tax period ending prior to or on the Spin-Off Date. Plains will not
accept or offer any settlement or compromise of such issues without the consent
of Spinco, and such consent shall not be unreasonably withheld. If, in Plains's
opinion, Spinco unreasonably withholds such consent, Plains shall have the right
to settle or compromise such issues on the basis contained in the notice to
Spinco. If Spinco thereafter desires to dispute such settlement or compromise,
Spinco's claim with respect thereto shall constitute a claim for purposes of
Paragraph 28 of this Agreement.

     11. Spinco's Right to Contest. Should Plains decline or cease to contest
any proposed adjustment relating to the activities of the Spinco Group for any
Tax period ending prior to or on the Spin-Off Date, Plains shall so notify
Spinco. Spinco, at its expense and upon providing reasonable assurances to
Plains of Spinco's ability to pay any Taxes resulting from any such proposed
adjustment, may contest such proposed adjustment; but in no event shall Spinco
be permitted to accept or offer any settlement or compromise that would require
the settlement or compromise of issues relating to the Tax liabilities of
members of the Plains Group other than the Spinco Group.

                                      -9-

<PAGE>

     12. Subsequent Adjustments or Refunds. With respect to any Tax period of
the Plains Group after December 31, 2001, for which Plains received (or would be
entitled to receive) from Spinco a payment pursuant to Paragraph 5 or this
Paragraph 12, if the filing of an amended income Tax Return, final determination
of any adjustment made by any Tax Authority or the receipt of a refund by Plains
occurs with respect to such period and such event would cause a difference in
the amount of payment required for such period as previously calculated pursuant
to Paragraph 5 or this Paragraph 12, Plains shall give Spinco prompt notice of
such difference and Plains shall be obligated to pay or entitled to receive from
Spinco the amount of such difference. Any amount required to be paid pursuant to
this Paragraph 12 shall include any interest imposed by or received from the Tax
Authority if the adjustment results in the payment of Tax to or receipt of Tax
from the Tax Authority.

     In addition, Plains and Spinco acknowledge and agree that the tax sharing
agreement in effect for the Plains Group as of December 31, 2001, shall be
negated and canceled as of the Spin-Off Date. Plains and Spinco further agree
that there are no claims or causes of action under such tax sharing agreement as
of December 31, 2001, for periods ending on or before December 31, 2001, by
either of them or any member of their respective group against the other or any
member of the other's group, and they release each other from any and all such
claims. With respect to Taxes for periods ending after December 31, 2001, Plains
and Spinco agree that this Agreement shall control. Spinco agrees that it will
have no right to request that Plains file an amended return or a claim for
refund for any reason, unless Spinco agrees to pay any Tax liability shown
thereon or therein and Plains, in its absolute discretion (which may be withheld
for any reason), agrees. In the event Spinco generates net operating losses or
other Items of Loss or Tax Benefit after the Spin-Off Date that may otherwise be
carried back to the taxable income

                                      -10-

<PAGE>

or Tax liability of the Plains Group prior to the Spin-Off Date, Spinco agrees
to relinquish the entire carry back period with respect to each such net
operating loss or other Items of Loss or Tax Benefit under Section 172(b)(3) or
other appropriate sections and to carry forward any such losses and other items.

     13. Spinco Spin-Off Tax Indemnity. Notwithstanding any other provision of
this Agreement to the contrary, Spinco shall be liable for, shall pay and shall
indemnify and hold Plains and the other members of the Plains Group harmless, on
an After-Tax Basis, against (A) any Transfer Taxes and other Taxes which may be
imposed or assessed as a result of the contribution by Plains to the capital of
Spinco or the acquisition (by sale or purchase or otherwise) by Spinco or one or
more of the other members of the Spinco Group of assets associated with the
upstream business conducted by the Plains Group, including the stock of certain
subsidiaries included in the Plains Group and engaged in the exploration and
production business, (B) any Taxes resulting from the recognition of deferred
intercompany gains as contemplated by Paragraph 6 hereof, and (C) any Spin-Off
Tax. In determining the amount of, and the time of payment of, any such Transfer
Taxes, other Taxes or Spin-Off Tax owed by Spinco to Plains, the principles set
forth in the last three sentences of Paragraph 5 shall apply.

     In addition, Spinco shall be liable, and shall indemnify Plains, for 50
percent of any Tax to which Plains or any member of the Plains Group is subject
as a result of the application of any provision of the Code to the Spin-Off,
including without limitation, Section 311(b), Section 355(c)(2), Section 355(e)
or Section 361(c)(2) of the Code (or any corresponding or similar provision of
state, local or foreign law), other than (i) any Spin-Off Tax, which is provided
for in the immediately preceding paragraph, or (ii) any such Tax which results
(x) solely from the fact that one or more persons acquire after the Spin-Off
Date directly or

                                      -11-

<PAGE>

indirectly stock representing a 50-percent or greater interest in Plains and
such acquisition is subject to Section 355(e) of the Code, (y) from the failure
of Plains or any other member of the Plains Group (other than Spinco or any
other member of the Spinco Group) to comply with the covenants, agreements and
representations in the Ruling, except to the extent that any of the covenants,
agreements or representations require compliance by Spinco or any other member
of the Spinco Group after the Spin-Off, or (z) from any action by, or failure to
take an action on the part of, Plains or any other member of the Plains Group
(other than Spinco or any other member of the Spinco Group).

     14. Future Actions. Spinco agrees that, during the three-year period
following the Spin-Off, it will not engage in any transaction that could
adversely affect the tax treatment of the Spin-Off without the prior written
consent of Plains, which consent may be withheld only if reasonable, unless (i)
Spinco delivers to Plains a supplemental ruling from the Internal Revenue
Service or a tax opinion acceptable to Plains of nationally recognized tax
counsel to the effect that the proposed transaction would not adversely affect
the tax treatment of the Spin-Off, or (ii) Spinco or another person or entity
acceptable to Plains provides to, or for the benefit of, Plains a cash escrow,
letter of credit or other comparable security acceptable to Plains in an amount
equal to the Taxes and accrued interest thereon (which accrued interest shall be
increased over time until such Taxes are paid or determined not to be payable)
that Plains reasonably calculates would be payable if the Spin-Off were
determined to be a taxable event for Tax purposes, with the terms and conditions
of any such cash escrow, letter of credit or other security being mutually
acceptable to Plains and Spinco or such other person or entity, as the case may
be. Plains agrees to cooperate with and provide reasonable assistance to Spinco
in the event that Spinco requests a supplemental ruling from the Internal
Revenue Service.

                                      -12-

<PAGE>

     15. Combined, Consolidated or Unitary Basis Returns. The parties
acknowledge that certain state, local or foreign Tax Authorities may require, or
one of the parties may desire, to file amended or original state, local or
foreign income Tax Returns on a combined, consolidated or unitary basis. In this
regard, Spinco agrees that it will have no right to request that Plains file an
amended return or a claim for refund for any reason, unless Spinco agrees to pay
any Tax liability shown thereon or therein and Plains, in its absolute
discretion (which may be withheld for any reason), agrees. Such filing may
result in an aggregate decrease in the state, local or foreign income Tax of
both parties; however, one party may suffer a Tax increase compared to its
state, local or foreign income Tax liability calculated on a separate company
basis, while the other party enjoys a Tax decrease. In any such event, the
parties intend that the required calculations for determining which party owes
Taxes to the other with respect thereto be made by utilizing the principles set
forth in Paragraphs 3, 4, 5 and 12 hereof.

     16. Earnings and Profits Information. The parties agree to share such
information as is necessary to allocate properly the earnings and profits of the
Spinco Group in accordance with the Code and Treasury Regulations for Tax
periods prior to or ending on the Spin-Off Date. After the Spin-Off, Plains
agrees to provide Spinco and Spinco's independent auditors with such information
as is necessary to verify amounts received or receivable or paid or payable by
Spinco under this Agreement. Spinco agrees to make available to Plains, upon
request, all Federal, state, local and foreign Tax Returns, work papers and
other documents pertaining to the activities of the Spinco Group prior to the
Spin-Off.

     17. Tax Interpretation. For all Tax purposes and notwithstanding any other
provision of this Agreement, to the extent permitted by applicable law, the
parties hereto shall treat any payment made pursuant to this Agreement as a
capital contribution or dividend distribution, as

                                      -13-

<PAGE>

the case may be, immediately prior to the Spin-Off Date and, accordingly, as not
includible in the taxable income of the recipient. If it is finally determined
that the receipt or accrual of any payment made under this Agreement is taxable
to the recipient, the payor shall pay to the recipient, on an After-Tax Basis,
an amount equal to any increase in the Taxes of the recipient as a result of
receiving the payment from the payor.

     18. Consistent Tax Treatment. To the extent that assets are assigned, sold,
transferred or conveyed by a member of the Plains Group to Spinco or another
member of the Spinco Group in contemplation of the Separation (as defined in the
Distribution Agreement) or the Spin-Off and any such transaction is treated as a
sale for Tax purposes, the aggregate purchase price shall be allocated among the
assets assigned, sold, transferred or conveyed as determined by Plains in its
sole discretion. Each of Plains and Spinco agrees to report and, where
applicable, to cause the members of their respective groups to report, the
purchase prices of such assets as determined by Plains.

     19. Retention of Records. Each party hereto agrees, to the extent
potentially relevant to the other party, to (1) retain, in accordance with
Plains' record retention policies in effect on the date of this Agreement, all
records, documents, accounting and other information (including computer data)
necessary for the preparation and filing of all Returns or the audit of such
Returns, and (2) give to the other party reasonable access to such records,
documents, accounting data, Returns and related books and records and other
information (including computer data) and to its personnel (insuring their
cooperation) and premises, for purposes of the review or audit of such Returns
to the extent relevant to an obligation or liability of a party under this
Agreement.

     20. Post Spin-Off Period Taxes. Except as otherwise provided to the
contrary in this Agreement, (i) Plains and the other members of the Plains Group
(which, for this purpose, shall

                                      -14-

<PAGE>

not include Spinco and the other members of the Spinco Group) shall be solely
responsible for all Taxes of the Plains Group (which, for this purpose, shall
not include Spinco and the other members of the Spinco Group) arising in Tax
periods beginning after the Spin-Off Date, and (ii) Spinco and the other members
of the Spinco Group shall be solely responsible for all Taxes of the Spinco
Group arising in Tax periods beginning after the Spin-Off Date.

     21. Expenses. Each party will bear its own expenses in complying with this
Agreement, including but not limited to the cost of employee work hours. The
sharing of fees and expenses of nonemployees and independent contractors
mutually engaged by the parties shall be agreed upon before such persons are
engaged.

     22. Definitions.

          (a) "After-Tax Basis" means, with respect to any payment, an amount
calculated by taking into account the Tax consequences of the receipt of such
payment, as well as any Tax benefit associated with the liability giving rise to
the payment, in each case calculated on a present value basis using the Agreed
Rate.

          (b) "Agreed Rate" means the annual rate of interest quoted, from time
to time, by JPMorgan Chase Bank in Houston, Texas as its prime rate of interest
for the purpose of determining the interest rates charged by it for United
States dollar commercial loans made in the United States.

          (c) "Code" has the meaning set forth in the first recital hereof.

          (d) "Conversion" has the meaning set forth in the third recital
hereto.

          (e) "Converted Corporation" has the meaning set forth in the third
recital hereto.

                                      -15-

<PAGE>

          (f) "Distribution Agreement" means that certain Master Separation
Agreement dated as of the date hereof, by and between Plains and Spinco, as the
same may be amended or otherwise modified from time to time pursuant to the
terms thereof.

          (g) "Items of Loss or Tax Benefit" has the meaning set forth in
Paragraph 1 hereof.

          (h) "Interim Period" has the meaning set forth in Paragraph 2 hereof.

          (i) "Plains" has the meaning set forth in the preamble hereto.

          (j) "Plains Group" has the meaning set forth in the first recital
hereto.

          (k) "Returns" means all returns, declarations, reports, statements and
other documents required to be filed in respect of Taxes, and the term "Return"
means any one of the foregoing Returns.

          (l) "Ruling" means that certain private letter ruling issued by the
Internal Revenue Service on May 22, 2002, with respect to the Spin-Off and
relating to the tax consequences associated with the distribution of all
outstanding shares of Spinco common stock, as the same may be amended,
supplemented or otherwise modified or added to by the Internal Revenue Service
on or before the Spin-Off Date.

          (m) "Short Period" has the meaning set forth in Paragraph 2 hereof.

          (n) "Spinco" means, as the case may be, Plains E&P or the Converted
Corporation.

          (o) "Spinco Group" has the meaning set forth in Paragraph 1 hereof.

          (p) "Spin-Off" has the meaning set forth in the fourth recital hereof.

          (q) "Spin-Off Date" has the meaning set forth in the fourth recital
hereof.

                                      -16-

<PAGE>

          (r) "Spin-Off Tax" means any Tax to which Plains or any member of the
Plains Group is subject as a result of the application of any provision of the
Code to the Spin-Off, including without limitation, Section 311(b), Section
355(c)(2), Section 355(e) or Section 361(c)(2) of the Code (or any corresponding
or similar provision of state, local or foreign law), which results (i) solely
from the fact that one or more persons acquire after the Spin-Off Date directly
or indirectly stock representing a 50-percent or greater interest in Spinco and
such acquisition is subject to Section 355(e) of the Code; (ii) from the failure
of Spinco or any other member of the Spinco Group to comply with the covenants,
agreements and representations in the Ruling; (iii) from any action by, or
failure to take an action on the part of, Spinco or any other member of the
Spinco Group, or (iv) from any combination of (i) through (iii) above.

          (s) "Stocker Inc." has the meaning set forth in the third recital
hereto.

          (t) "Tax Authority" means the United States Internal Revenue Service
or any other comparable state, local or foreign governmental authority.

          (u) "Taxes" means all federal, state, local, foreign and other taxes,
duties, levies, imposts, customs or other assessments, including, without
limitation, all net income, alternative minimum, gross income, gross receipts,
sales, use, ad valorem, transfer, franchise, profits, profit share, license,
value added, withholding, payroll, employment, excise, estimated, severance,
stamp, occupation, premium, property, windfall profits, or other taxes, of any
kind whatsoever, together with any interest, penalties, additions to tax, fines
or other additional amounts imposed thereon or related thereto, and the term
"Tax" means any one of the foregoing Taxes.

                                      -17-

<PAGE>

          (v) "Transfer Tax" means any excise, sales, use, transfer,
documentary, filing, recordation or other similar tax or fee, together with any
interest, additions or penalties with respect thereto and any interest in
respect of such additions or penalties.

     23. Notices. All notices and other communications to be given or made
hereunder shall be in writing and shall be (a) personally delivered with signed
receipt obtained acknowledging delivery; (b) transmitted by postage prepaid
registered mail, return receipt requested (air mail if international); or (c)
transmitted by facsimile; to a party at the address set out below (or at such
other address as it may have provided notification for the purposes hereof to
the other party hereto in accordance with this Section).

          If to Spinco:         Plains Exploration & Production Company, L.P.
                                500 Dallas Street, Suite 700
                                Houston, Texas 77002
                                Fax number: 713-654-4915
                                Attention:  General Counsel

          If to Plains:         Plains Resources Inc.
                                500 Dallas Street, Suite 700
                                Houston, Texas 77002
                                Fax number: (713) 654-4915
                                Attention:  Chief Executive Officer

     24. Binding Effect; Successors. This Agreement shall be binding upon and
inure to the benefit of and be enforceable by the parties hereto and any
successor, by merger, acquisition of substantially all of a party's assets or
otherwise, to either of the parties hereto (including but not limited to any
successor of Plains or Spinco succeeding to the Tax attributes of Plains or
Spinco under Section 381 of the Code), to the same extent as if such successor
had been an original party to this Agreement. In addition, in the event of an
acquisition of substantially all of the assets of Spinco in which gain or loss
is not recognized, in whole or in part, for Federal

                                      -18-

<PAGE>

income Tax purposes, Spinco shall ensure that any purchaser of such assets shall
assume the obligations set forth in this Agreement.

     25. Severability. Any provision of this Agreement that is determined by
arbitration as provided herein or a court of competent jurisdiction to be
invalid, illegal or unenforceable shall be ineffective to the extent of such
invalidity, illegality or unenforceability, without affecting in any way the
remaining provisions hereof in such jurisdiction or rendering that or any other
provision of this Agreement invalid, illegal or unenforceable, so long as the
material purposes of this Agreement can be determined and effectuated. Should
any provision of this Agreement be so declared invalid, illegal or
unenforceable, the parties shall agree on a valid provision to substitute for
it.

     26. Entire Agreement. This Agreement, including the exhibit and other
writings referred to herein or delivered pursuant hereto and the Distribution
Agreement, as well as the other agreements entered into by and between Plains
and Spinco in connection with the transactions contemplated by the Distribution
Agreement, constitutes the entire agreement between Plains and Spinco with
respect to the subject matter hereof and supersedes all other agreements,
representations, warranties, statements, promises and undertakings, whether oral
or written, with respect to the subject matter hereof, including, without
limitation, any and all Tax sharing agreements or arrangements (whether oral or
written) between Plains and the other members of the Plains Group (other than
the Spinco Group) on the one hand and Spinco and the other members of the Spinco
Group on the other hand, that require payments or indemnities to be made with
respect to Taxes. This Agreement may not be amended, altered or modified except
by a writing signed by duly authorized officers of Plains and Spinco.

                                      -19-

<PAGE>

     27. Governing Law. All questions arising out of this Agreement and the
rights and obligations created herein, or its validity, existence,
interpretation, performance or breach, shall be governed by and construed in
accordance with the internal laws of the State of Texas, without regard to or
the application of the rules of conflicts of laws set forth in such laws.

     28. Arbitration. The parties agree that any claim arising out of or related
to this Agreement shall be governed by the dispute resolution, arbitration and
choice of forum provisions set forth in Article VIII of the Distribution
Agreement.

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

                              PLAINS RESOURCES INC.

                              By: /s/ Jere C. Overdyke
                                  -----------------------------------------
                                  Jere C. Overdyke
                                  Executive Vice President

                              PLAINS EXPLORATION & PRODUCTION
                              COMPANY, L.P.

                              By: Stocker Resources, Inc., its Sole General
                                  Partner

                              By: /s/ Jere C. Overdyke
                                  -----------------------------------------
                                  Jere C. Overdyke
                                  Vice President

                                      -20-

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