Document:

EXHIBIT 4.3

                               CREDIT AGREEMENT
                               ----------------

                                 $15,000,000.00
                    SECURED REDUCING REVOLVING LINE OF CREDIT

                                      FROM

                                  COMPASS BANK

                                       TO

                             WHITTIER ENERGY COMPANY
                                       AND
                            WHITTIER OPERATING, INC.

                                  JULY 17, 2002

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                                TABLE OF CONTENTS

                                                                                           Page
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ARTICLE I.   DEFINITIONS.....................................................................1

ARTICLE II.   THE LOAN......................................................................10
    2.01         The Loan...................................................................10
    2.02         Advances and Payments of Principal Under the Note..........................10
    2.03         Payments of Interest under the Note........................................11
    2.04         Provisions Relating to Interest............................................11
    2.05         Advances to Satisfy Obligations of Borrower................................12
    2.06         Mandatory Prepayment of the Note...........................................12
    2.07         Borrowing Base Determination...............................................12
    2.08         Assignment of Production...................................................14
    2.09         Commitment Fee.............................................................14
    2.10         Facility Fee...............................................................14
    2.11         Letters of Credit..........................................................15
    2.12         Repayment of Letters of Credit.............................................15
    2.13         Letter of Credit Fee.......................................................15

ARTICLE III.   CONDITIONS...................................................................15
    3.01         Receipt of Note, Agreement and Compliance Certificate......................16
    3.02         Receipt of Assignment of Note, Liens and Security Interests................16
    3.03         Receipt of Organizational Documents........................................16
    3.04         Receipt of Certified Copy of Corporate Proceedings and Certificates
                 of Incumbency..............................................................16
    3.05         Receipt of Certificates of Authority and Certificates of Good Standing.....16
    3.06         UCC Search.................................................................16
    3.07         Fees.......................................................................16
    3.08         Use of Loan Proceeds.......................................................16
    3.09         Request for Advance........................................................17
    3.10         Accuracy of Representations and Warranties and No Event of Default.........17
    3.11         Legal Matters Satisfactory to Counsel to Bank..............................17
    3.12         No Material Adverse Change.................................................17
    3.13         Status of Title............................................................17
    3.14         Security Instruments.......................................................17
    3.15         Legal Fees.................................................................17
    3.16         Documents Required for Subsequent Disbursements............................17

ARTICLE IV.   REPRESENTATIONS AND WARRANTIES................................................18
    4.01         Existence and Good Standing................................................18
    4.02         Due Authorization..........................................................18

                                             i
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    4.03         Valid and Binding Obligations..............................................18
    4.04         Ownership of Borrowing Base Properties.....................................18
    4.05         Oil and Gas Leases.........................................................19
    4.06         Interest in the Borrowing Base Properties..................................19
    4.07         Oil and Gas Contracts......................................................19
    4.08         Producing Wells............................................................19
    4.09         Purchasers of Production...................................................20
    4.10         Scope and Accuracy of Financial Statements.................................20
    4.11         Liabilities, Litigation and Restrictions...................................20
    4.12         Margin Stock...............................................................20
    4.13         Authorizations and Consents................................................20
    4.14         Compliance with Laws, Rules, Regulations and Orders........................20
    4.15         Proper Filing of Tax Returns and Payment of Taxes Due......................21
    4.16         ERISA......................................................................21
    4.17         Investment Company Act Compliance..........................................21
    4.18         Public Utility Holding Company Act Compliance..............................21
    4.19         Environmental Laws.........................................................21
    4.20         Existing Indebtedness......................................................22
    4.21         Subsidiaries...............................................................22
    4.22         Investments................................................................22
    4.23         Hedge Transactions.........................................................23

ARTICLE V.   AFFIRMATIVE COVENANTS..........................................................23
    5.01         Use of Funds...............................................................23
    5.02         Maintenance and Access to Records..........................................23
    5.03         Quarterly Financial Statements of Borrower.................................23
    5.04         Annual Financial Statements of Borrower....................................23
    5.05         Quarterly Compliance Certificates..........................................23
    5.06         Statement of Material Adverse Change in Condition..........................24
    5.07         Additional Information.....................................................24
    5.08         Compliance with Laws and Payment of Assessments and Charges................24
    5.09         Maintenance of Existence and Good Standing.................................24
    5.10         Further Assurances.........................................................24
    5.11         Initial Expenses of Bank...................................................24
    5.12         Subsequent Expenses of Bank................................................24
    5.13         Maintenance of Tangible Property...........................................25
    5.14         Maintenance of Insurance...................................................25
    5.15         Inspection of Tangible Assets/Right of Audit...............................25
    5.16         Payment of Note and Performance of Obligations.............................25
    5.17         ERISA Reports..............................................................25
    5.18         Compliance with Laws.......................................................26
    5.19         Hazardous Substances Indemnification.......................................26
    5.20         Operating Accounts.........................................................27

                                             ii
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    5.21         Changes in Management......................................................27
    5.22         Proceeds from Hedging Transactions.........................................27
    5.23         Production Reports.........................................................27
    5.24         Hedging Transaction Reports................................................27
    5.25         Aged Accounts Reports......................................................28
    5.26         Payment of Contract Operators..............................................28
    5.27         Payment of Royalties.......................................................28
    5.28         Tangible Net Worth Requirements............................................28
    5.29         EBITDAX to Interest Expense Ratio..........................................28
    5.30         Current Ratio..............................................................29
    5.31         Additional Collateral......................................................29
    5.32         East Hamel Borrowing Base Properties.......................................29

ARTICLE VI.   NEGATIVE COVENANTS............................................................29
    6.01         Loans, Advances, or Investments............................................29
    6.02         Mortgages or Pledges of Assets.............................................30
    6.03         Nature of Business.........................................................30
    6.04         Sales of Assets............................................................30
    6.05         Payment of Accounts Payable................................................30
    6.06         Cancellation of Insurance..................................................30
    6.07         Changes in Business Structure..............................................30
    6.08         Creation of New Subsidiaries...............................................30
    6.09         Management and Shareholder Control.........................................30
    6.10         Transactions with Affiliates...............................................31
    6.11         Hedging Transactions.......................................................31
    6.12         Dividends and Distributions................................................31
    6.13         Other Indebtedness.........................................................31

ARTICLE VII.   EVENTS OF DEFAULT............................................................31
    7.01         Enumeration of Events of Default...........................................31
    7.02         Rights Upon Default........................................................33
    7.03         Rights Upon Unmatured Event of Default.....................................33

ARTICLE VIII.   MISCELLANEOUS...............................................................33
    8.01         Security Interests in Deposits and Right of Offset or Banker's Lien........33
    8.02         Survival of Representations, Warranties and Covenants......................33
    8.03         Notices and Other Communications...........................................34
    8.04         Renewals and Extensions....................................................34
    8.05         No Waiver by Bank..........................................................34
    8.06         INDEMNIFICATION............................................................34
    8.07         GOVERNING LAW..............................................................35
    8.08         Incorporation of Exhibits and Schedules....................................35
    8.09         Survival Upon Unenforceability.............................................35
    8.10         Rights of Third Parties....................................................35
    8.11         Amendments or Modifications of this Agreement..............................35
    8.12         Agreement Construed as an Entirety.........................................35
    8.13         Number and Gender..........................................................36
    8.14         AGREEMENT SUPERSEDES ALL PRIOR AGREEMENTS..................................36
    8.15         Hedging Transactions.......................................................36
    8.16         Controlling Provision Upon Conflict........................................36
    8.17         Time, Place and Method of Payments.........................................36
    8.18         Counterpart Execution......................................................37
    8.19         Continuing Security........................................................37

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EXHIBITS

EXHIBIT A      Note
EXHIBIT B      Security Instruments
EXHIBIT C      Request for Advance
EXHIBIT D      Compliance Certificate

SCHEDULES
---------

1.01(a)        Borrowing Base Properties
4.09           Purchasers of Production
4.11           Litigation
4.20           Existing Indebtedness
4.23           Existing Hedge Transactions
5.01           Use of Funds
6.01           Investments
6.09           Whittier Family Group and Ownership Interest in Borrower

                                       iv
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                                CREDIT AGREEMENT
                                ----------------

     THIS CREDIT AGREEMENT, is entered into as of the 17th day of July 2002, by
and among WHITTIER ENERGY COMPANY, a Nevada corporation ("Whittier Energy"), and
WHITTIER OPERATING, INC., a Texas corporation ("Whittier Operating")
(collectively, the "Borrower") and COMPASS BANK, an Alabama state chartered bank
(the "Bank").

                               W I T N E S S E T H

     WHEREAS, Borrower desires to obtain loans from Bank to be used for the
purposes set forth on Schedule 5.01 attached hereto; and

     WHEREAS, Bank is willing to loan such funds to Borrower in accordance with
the terms of this Agreement;

     NOW, THEREFORE, in consideration of the mutual covenants and agreements
herein contained, Bank and Borrower agree as follows:

                             ARTICLE I. DEFINITIONS

     As used in this Agreement, the following terms shall have the meanings
indicated:

     "Affiliate" means, as applied to any Person, any other Person, directly or
indirectly, controlling, controlled by, or under common control with, that
Person. For purposes of this definition, "control" (including, with correlative
meanings, the terms "controlling", "controlled by", and "under common control
with"), as applied to any Person, means the possession, directly or indirectly,
of the power to direct or cause the direction of the management and policies of
that Person, whether through the ownership of voting securities, by contract, or
otherwise.

     "Agreement" means this Credit Agreement, as the same may be amended or
supplemented from time to time.

     "Applicable Law" means all ordinances, statutes, rules, regulations,
orders, injunctions, writs or decrees of any government or political subdivision
or agency thereof, or any court or similar entity established by any thereof,
that are applicable to Bank, any Borrower, any of the Borrowing Base Properties
or other assets of Borrower, and/or all or any part of the transactions
evidenced by this Agreement and/or any of the Loan Documents.

     "Assignment of Note, Liens and Security Interests" means that certain
Assignment of Note, Liens and Security Interests duly executed by Equiva,
pursuant to which the Equiva Note, the Equiva Credit Agreement, and the Equiva
Security Instruments, and all rights associated therewith, are assigned to Bank.

<PAGE>

     "Bank" has the meaning set forth in the preamble hereof.

     "Big Wells PSA" means that certain Purchase and Sale Agreement dated June
20, 2002 by and between Whittier Energy and Sue-Ann Operating, L.C., a Texas
limited liability company, covering various Oil and Gas Properties located in
Dimmitt County, Texas as more fully described on Exhibit "A" attached to such
Purchase and Sale Agreement.

     "Borrower" has the meaning set forth in the preamble hereof.

     "Borrowing Base" means the maximum loan amount supported by the Borrowing
Base Properties, as determined by Bank from time to time in accordance with
Section 2.07 of this Agreement.

     "Borrowing Base Properties" means those Oil and Gas Properties of Whittier
Energy that will, with execution of the Loan Documents, be subject to liens
created by certain of the Security Instruments to secure the Obligations, which
initial Borrowing Base Properties are described in Schedule 1.01(a) attached
hereto and made a part hereof and such Borrowing Base Properties to include
those Oil and Gas Properties described on Part Two of such Schedule 1.01(a) upon
the satisfaction of the conditions precedent under Section 3.17 hereof.

     "Borrowing Base Property Data" means geological data relative to the Proved
Reserves that are attributable to the Borrowing Base Properties, all data of the
type required to be reported by Borrower pursuant to Section 5.23 of this
Agreement, and all such other information as Bank may request regarding volumes
of production produced and sold, contracts, pricing, gross revenues, expenses,
and other information and engineering and geological data as may relate to the
Borrowing Base Properties.

     "Business Day" means a day other than a Saturday, Sunday or legal holiday
for commercial banks under the laws of the State of Texas.

     "Business Entity" means a company, corporation, limited liability company,
limited partnership, partnership, joint venture, trust, association, or other
entity other than a natural person, that has been formed and exists to conduct
any line of business.

     "Certificate of Formation" means any certificates, articles, or other
instruments that are required or permitted to be filed with any designated
agency of the jurisdiction in which a Business Entity is formed in order to
evidence the legal formation of such Business Entity.

     Chapparal" has the meaning set forth in Section 4.22 hereof.

                                       2
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     "Closing" means the closing of the transaction contemplated herein to occur
contemporaneously with the execution of this Agreement.

     "Compliance Certificate" means the certificate of the Chief Executive
Officer, President or Vice President of Borrower required to be submitted to
Bank from time to time pursuant to this Agreement, which certificate shall be in
the form attached hereto as Exhibit "D."

     "Corporate Action" means action taken by the Governing Body of any Business
Entity (not just a corporation) in order to authorize such Business Entity
pursuant to its Governing Documentation to enter into and become bound by the
terms of any particular transaction.

     "Corporate Power" means the power and authority of a Business Entity, under
the terms of its Governing Documentation and applicable law, to enter into, and
become bound by, the terms of any particular transaction.

     "Environmental Laws" means (a) the following federal laws as they may be
cited, referenced and amended from time to time: the Clean Air Act, the Clean
Water Act, the Safe Drinking Water Act, the Comprehensive Environmental
Response, Compensation and Liability Act, the Endangered Species Act, the
Resource Conservation and Recovery Act, the Occupational Safety and Health Act,
the Hazardous Materials Transportation Act, the Superfund Amendments and
Reauthorization Act, and the Toxic Substances Control Act; (b) any and all
environmental statutes of any state in which property of Borrower is situated,
as they may be cited, referenced and amended from time to time; (c) any rules or
regulations promulgated under or adopted pursuant to the above federal and state
laws; and (d) any other federal, state or local statute or any requirement,
rule, regulation, code, ordinance or order adopted pursuant thereto, including,
without limitation, those relating to the generation, transportation, treatment,
storage, recycling, disposal, handling or release of Hazardous Substances.

     "Equiva" means Equiva Trading Company, a Delaware general partnership.

     "Equiva Credit Agreement" means that certain Loan Agreement dated April 5,
2002, by and between Whittier Energy and Equiva, as amended.

     "Equiva Note" means that certain Term Note dated April 5, 2002, in the
original principal sum of $2,500,000, executed by Whittier Energy as maker, and
payable to the order of Equiva, as payee, as said note may have been renewed,
extended, amended and/or replaced.

                                       3
<PAGE>

     "Equiva Security Instruments" means the "Security Instruments," as defined
in the Equiva Credit Agreement, together with all other financing statements,
mortgages, deeds of trust, security agreements, pledges and other instruments
creating liens or security interests executed by Whittier Energy or its
predecessors, either prior to or after the date of the Equiva Credit Agreement,
which secure any of the indebtedness and obligations owed by Whittier Energy to
Equiva, in connection with the Equiva Credit Agreement and/or the Equiva Note.

     "ERISA" means the Employee Retirement Income Security Act of 1974, as
amended from time to time, and the regulations and published interpretations
thereof.

     "ERISA Affiliate" means any trade or business (whether or not incorporated)
which together with Borrower would be treated as a single employer under Section
4001 of ERISA.

     "Event of Default" means any of the events specified in Section 7.01 of
this Agreement.

     "Existing Indebtedness" has the meaning set forth in Section 4.20.

     "Financial Statements" means the statements of the financial condition of
the indicated Person, as at the point in time and for the period indicated and
consisting of at least a consolidated balance sheet, income statement and
statement of cash flows, and, when the foregoing are audited, accompanied by the
certification of such Person's independent certified public accountants and
footnotes to any of the foregoing, with such statements to be prepared in
accordance with GAAP.

     "Floating Rate" means, except as provided otherwise in Section 2.04 hereof,
the Index Rate in effect from time to time plus three-fourths of one percent
(0.75%).

     "GAAP" means generally accepted accounting principles, applied on a
consistent basis, as set forth in Opinions of the Accounting Principles Board of
the American Institute of Certified Public Accountants and/or in statements of
the Financial Accounting Standards Board and/or their respective successors and
which are applicable in the circumstances as of the date in question. Accounting
principles are applied on a "consistent basis" when the accounting principles
observed in a current period are comparable in all material respects to those
accounting principles applied in a preceding period.

     "Governing Body" means, in the case of a corporation, its board of
directors, in the case of a limited liability company, its members or its
managers, depending on how the management of such Business Entity is allocated
in its Governing Documentation, in the case of a general partnership or joint
venture, the partners or the joint venturers thereof, respectively, in the case
of a limited partnership, the applicable Governing Body of the general partner
thereof, if such general partner is a Business Entity, and in the case of any
other Business Entity not specified herein, the designees thereof that, pursuant
to the Governing Documentation of such Business Entity, fulfill the
responsibilities typically discharged by a board of directors of a corporation.

                                       4
<PAGE>

     "Governing Documentation" means, in the case of a corporation, its
certification of incorporation, articles of incorporation and by laws, as
amended, in the case of a limited liability company, its certificate of
formation, its limited liability company agreement, and its operating agreement
or regulations (or similar documentation as denominated under the laws of the
jurisdiction in which it is formed), in the case of a partnership, joint venture
or a limited partnership, the applicable partnership agreement or joint venture
agreement, and in the case of any other Business Entity not specifically
enumerated herein, the applicable documentation typically utilized in the
jurisdiction where such Business Entity has been formed for purposes of
initially forming such Business Entity according to the laws of such
jurisdiction and thereafter operating and managing such Business Entity.

     "Hazardous Substances" means flammables, explosives, radioactive materials,
hazardous wastes, asbestos or any material containing asbestos, polychlorinated
biphenyls (PCBs), toxic substances or related materials, petroleum and petroleum
products and associated oil or natural gas exploration, production and
development wastes or any substances defined as "hazardous substances",
"hazardous materials", "hazardous wastes" or "toxic substances" under the
Comprehensive Environmental Response, Compensation and Liability Act, as
amended, the Superfund Amendments and Reauthorization Act, as amended, the
Hazardous Materials Transportation Act, as amended, the Resource Conservation
and Recovery Act, as amended, the Toxic Substances Control Act, as amended, or
any other Environmental Laws now or hereafter enacted or promulgated by any
regulatory authority or governmental body.

     "Hedging Transaction" means a swap, collar, floor, cap, forward, futures,
spot or foreign currency exchange transaction, cross currency rate swap,
currency option, or any combination of, or option with respect to, any of the
foregoing or similar transactions (including sales contracts for a term of
greater than one year with fixed prices) entered into by Borrower with any other
Person, which is intended to reduce or eliminate the risk of fluctuations in
interest rates, exchange rates, currency, stock, portfolio or loan valuations or
commodity prices.

     "Indebtedness" means, as to any Person, (a) all items of indebtedness or
liability (other than capital, surplus, deferred credits and reserves, as such)
which in accordance with GAAP would be included in determining total liabilities
as shown on the liability side of a balance sheet as at the date as of which
Indebtedness is to be determined, (b) indebtedness secured by any mortgage,
pledge or lien existing on or encumbering property owned by the Person whose
Indebtedness is being determined, whether or not the indebtedness secured
thereby shall have been assumed, and (c) all indebtedness of others which such
Person has directly or indirectly guaranteed, endorsed (otherwise than for
collection or deposit in the ordinary course of business), discounted with
recourse, agreed (contingently or otherwise) to purchase or repurchase or
otherwise acquire, or in respect of which such Person has agreed to supply or
advance funds (whether by way of loan, purchase of securities or capital
contribution, through a commitment to pay for property or services regardless of
the nondelivery of such property or the nonfurnishing of such services or
otherwise), or in respect of which such Person has otherwise become directly or
indirectly liable, contingently or otherwise, whether now existing or hereafter
arising.

                                       5
<PAGE>

     "Index Rate" means, at any time, the prime rate established in The Wall
Street Journal's "Money Rates" or similar table. If multiple prime rates are
quoted in the table, then the highest prime rate will be the Index Rate. In the
event that the prime rate is no longer published by The Wall Street Journal in
the "Money Rates" or similar table, then Bank may select an alternative
published index based upon comparable information as a substitute Index Rate.
Upon the selection of a substitute Index Rate, the applicable interest rate
shall thereafter vary in relation to the substitute index. Such substitute index
shall be the same index that is generally used as a substitute by Bank on all
Index Rate loans.

     "Investment" in any Person means any stock, bond, note or other evidence of
Indebtedness or any other security (other than current trade and customer
accounts) of, or loan to, such Person.

     "ISDA Master Agreement" means a form of agreement for the conduct of
Hedging Transactions promulgated by the International Swap Dealers Association,
Inc. and referred to as the Master Agreement (Local Currency - Single
Jurisdiction) (copyright 1992) and the Schedule to the Master Agreement (ISDA
1992) to be attached thereto, with all blanks therein completed in accordance
with Bank's standard practices.

     "Leases" means oil and gas leases and all oil, gas and mineral leases
constituting any part of the Borrowing Base Properties.

     "Letter(s) of Credit" has the meaning set forth in Section 2.11 hereof.

     "Limitation Period" means any period while any amount remains owing on the
Note and interest on such amount calculated at the Floating Rate, plus any fees
payable hereunder and deemed to be interest under applicable law, would exceed
the Maximum Rate.

     "Loan" means, singly, any advance by Bank to Borrower pursuant to this
Agreement and "Loans" means, cumulatively, the aggregate sum of all money
advanced by Bank to Borrower pursuant to this Agreement.

     "Loan Documents" means this Agreement and all promissory notes, security
agreements, guaranties, and other instruments, documents, and agreements
executed and delivered pursuant to or in connection with this Agreement, as such
instruments, documents, and agreements may be amended, modified, renewed,
extended, or supplemented from time to time.

     "Loan Excess" means, at any point in time, the amount, if any, by which the
outstanding balance on the Loans evidenced by the Note exceeds the Revolving
Commitment then in effect.

     "Marketable Title" means good and indefeasible title and ownership, free
and clear of all mortgages, liens and encumbrances, except for Permitted
Encumbrances.

     "Maturity Date" means July 17, 2004.

                                       6
<PAGE>

     "Maximum Rate" means the maximum non-usurious interest rate permissible
under applicable laws of the State of Texas or those of the United States of
America applicable to Bank.

     "Monthly Borrowing Base Reduction" means the amount of the automatic
monthly reduction to the Borrowing Base, as determined by Bank from time to time
in accordance with Section 2.07 of this Agreement.

     "Multi-employer Plan" means a plan described in Section 4001(a)(3) of ERISA
which covers employees of Borrower or any ERISA Affiliate.

     "Note" means that certain reducing revolving promissory note in the
original face amount of $15,000,000.00, dated of even date herewith, made by
Borrower payable to the order of Bank, in the form attached hereto as Exhibit
"A", together with all deferrals, renewals, extensions, amendments,
modifications or rearrangements thereof, which promissory note shall evidence
the advances to Borrower by Bank pursuant to Section 2.01 hereof.

     "Obligations" means all obligations, indebtedness, and liabilities of
Borrower to Bank, now existing or hereafter arising, including, but not limited
to, the indebtedness evidenced by the Note, and any indebtedness or obligations
of Borrower to Bank arising under any Hedging Transaction or other Loan Document
between Borrower and Bank, whether direct, indirect, related, unrelated, fixed,
contingent, specified, unspecified, joint, several, or joint and several, and
all interest and fees accruing thereon and all attorneys' fees and other
expenses incurred in the enforcement or collection thereof.

     "Oil and Gas Properties" means fee, leasehold or other interests in or
under mineral estates or oil, gas and other liquid or gaseous hydrocarbon leases
with respect to properties situated in the United States, including, without
limitation, overriding royalty and royalty interests, leasehold estate
interests, net profits interests, production payment interests and mineral fee
interests, together with all contracts executed in connection therewith, all
oil, gas and other minerals produced and to be produced therefrom, all proceeds
thereof, and all tenements, hereditaments, appurtenances and properties, real or
personal, appertaining, belonging, affixed or incidental thereto.

     "PBGC" means the Pension Benefit Guaranty Corporation or any entity
succeeding to any or all of its functions under ERISA.

     "Permitted Encumbrances" means:

          (A)  Liens for taxes, assessments, or similar charges, incurred in the
               ordinary course of business that are not yet due and payable;

                                       7
<PAGE>

          (B)  Liens of mechanics, materialmen, warehousemen, carriers, or other
               similar liens, securing obligations incurred in the ordinary
               course of business that are not yet due and payable;

          (C)  Encumbrances consisting of zoning restrictions, easements, or
               other restrictions on the use of real property, none of which
               materially impairs the use of such property by Borrower in the
               operation of its business, and none of which is violated in any
               material respect by existing or proposed operations;

          (D)  Liens in favor of Bank;

          (E)  The following, if the validity or amount thereof is being
               contested in good faith by appropriate and lawful proceedings, so
               long as levy and execution thereon have been stayed and continue
               to be stayed, and in Bank's sole judgment they do not, in the
               aggregate, materially detract from the value of the property of
               Borrower or any Subsidiary, or materially impair the use thereof
               in the operation of its business:

               1.   Claims or liens for taxes, assessments, or similar charges;
                    and

               2.   Claims or liens of mechanics, materialmen, warehousemen,
                    carriers, or other similar liens; and

          (F)  Liens held by operators under customary forms of operating
               agreements securing lease operating expenses incurred in the
               ordinary course of business that are not yet due and payable.

     "Person" means an individual, company, corporation, partnership, limited
partnership, joint venture, trust, association, unincorporated organization or a
government or any agency or political subdivision thereof.

     "Prohibited Transaction" means any transaction set forth in Section 406 of
ERISA or Section 4975 of the Internal Revenue Code of 1986, as amended from time
to time.

     "Proved Developed Producing Reserves" means Proved Reserves that are
classified as Proved Developed Producing in accordance with the most current
criteria promulgated by the Society of Petroleum Engineers.

                                       8
<PAGE>

     "Proved Reserves" means the estimated quantities of crude oil, condensate,
natural gas liquids and natural gas which geological and engineering data
demonstrate with reasonable certainty to be recoverable by primary producing
mechanisms in future years from known reservoirs underlying lands or interests
therein constituting Oil and Gas Properties, under existing economic and
operating conditions. Reserves which can be produced economically through
application of improved recovery techniques (e.g., fluid injection) will be
included in Proved Reserves when successful testing by a pilot project or the
operation of an installed program in the reservoir provides support for the
engineering analysis on which the pilot project or installed program was based.
In general, the economic productivity of the estimated proved reserves is
supported by actual production or a conclusive formation test; however, in
certain instances proved reserves are assigned to reservoirs on the basis of a
combination of electrical and other type logs and core analyses which indicate
these reservoirs are analogous to similar reservoirs in the same field which are
producing or have demonstrated the ability to produce on a formation test.

     "Reportable Event" means any of the events set forth in Section 4043 of
ERISA.

     "PW9" means the present worth of future net income, discounted to the
present value at the simple interest rate of nine percent (9.0%) per year.

     "PYR Energy" has the meaning set forth in Section 4.22 hereof.

     "Request for Advance" means the written request by Borrower for an advance
by Bank pursuant to this Agreement, which Request for Advance shall be in a
form, and shall include the information and accompanying supporting
documentation, as prescribed in Exhibit "C" attached hereto.

     "Revolving Commitment" means the obligation of Bank, subject to the
provisions of this Agreement and existing only through the last Business Day
prior to the Maturity Date, to advance to Borrower funds, not to exceed at any
one time outstanding an amount equal to the Borrowing Base then in effect.

     "Security Instruments" means the security instruments described on Exhibit
"B", in form and substance satisfactory to Bank, to be executed by Whittier
Energy and/or Whittier Operating pursuant to Section 3.14, and any and all other
instruments or documents hereafter executed in connection with or as security
for the payment of the Note.

     "Subsidiary" means, with respect to any Person, (a) any corporation in
which such Person, directly or indirectly through its Subsidiaries, owns more
than fifty percent (50%) of the stock of any class or classes having by the
terms thereof the ordinary voting power to elect a majority of the directors of
such corporation; and (b) any partnership, association, joint venture, or other
entity in which such Person, directly or indirectly through its Subsidiaries,
has more than a fifty percent (50%) equity interest at the time.

                                       9
<PAGE>

     "Tangible Net Worth" means the total assets of Borrower exclusive of (a)
those assets classified as intangible, including, without limitation, goodwill,
patents, trademarks, trade names, copyrights, franchises and deferred charges,
(b) treasury stock and minority interests in any Person, (c) cash set apart and
held in a sinking or other analogous fund established for the purpose of
redemption or other retirement of capital stock, (d) to the extent not already
deducted from total assets, allowances for depreciation, depletion, obsolescence
and/or amortization of properties, uncollectible accounts, and contingent but
probable liabilities as to which an amount can be established, (e) all assets
arising from advances to any partners, managers, officers, former officers or
sales representatives of Borrower made outside of the ordinary course of
business, (f) unrealized gains or losses attributable to Borrower's ownership of
Securities in any Person as of the date of Closing and (g) unrealized gains or
losses accounted for in accordance with Financial Accounting Standard 133
relating to Hedging Transactions; less total liabilities of Borrower; all of the
above being determined in accordance with GAAP.

     "Unmatured Event of Default" means any event or occurrence which solely
with the lapse of time or the giving of notice or both will ripen into an Event
of Default.

     "Whittier Energy" has the meaning set forth in the preamble hereof.

     "Whittier Family Group" means those certain individuals listed on Schedule
6.09 as owners of the stock of Whittier Operating and Whittier Energy.

     "Whittier Operating" has the meaning set forth in the preamble hereof.

     Undefined financial accounting terms used in this Agreement shall be
defined in accordance with GAAP.

                              ARTICLE II. THE LOAN

     2.01 The Loan. Upon the terms and conditions (including, without
limitation, the right of Bank to terminate the Revolving Commitment hereunder
upon an Event of Default or an Unmatured Event of Default) and relying on the
representations and warranties contained in this Agreement, Bank agrees, for a
period from and after the date hereof through the last Business Day prior to the
Maturity Date, to make advances for the account of Borrower from time to time
following receipt of a Request for Advance; provided that each requested advance
must be in the amount of at least $50,000.00 and in additional increments of
$10,000.00; and provided, further, that the aggregate principal amount of all
Loans at any one time outstanding shall not exceed the Revolving Commitment.

     Through the last Business Day prior to the Maturity Date, Borrower may use
this revolving credit by borrowing, prepaying and reborrowing, all in accordance
with the terms and conditions of this Agreement. The borrowings made by Borrower
pursuant to the Revolving Commitment shall be made at the principal office of
Bank and shall be evidenced by the Note. The entire principal amount of the Note
is due on the Maturity Date.

                                       10
<PAGE>

     2.02 Advances and Payments of Principal Under the Note. Each time an
advance is made against or payment is made on the Note, Bank is hereby
irrevocably authorized by Borrower to make appropriate entries of such in its
records in accordance with the usual and customary practices of accounting for
advances and payments on notes; provided, however, the failure of Bank to do so
shall not relieve Borrower of its correct liability hereunder or under the Note.

     The aggregate unpaid amount of advances reflected by the notations by Bank
on its records or the ledger sheets affixed to the Note shall be deemed
rebuttably presumptive evidence of the principal amount owing on the Note. The
liability for payment of principal and interest evidenced by the Note shall be
limited to principal amounts actually advanced to Borrower and outstanding under
this Agreement and interest on such amounts calculated in accordance with this
Agreement. Interest provided for in the Note and herein shall be calculated on
unpaid sums actually advanced and outstanding under the Note pursuant to the
terms of this Agreement and only for the period from the date or dates of such
advances until repayment.

     2.03 Payments of Interest under the Note. Subject to the terms and
provisions of this Agreement, interest on the Loans, calculated at the Floating
Rate, shall be due and payable monthly as it accrues beginning August 1, 2002,
and continuing thereafter on the first day of each succeeding calendar month
while any amount remains owing on the Note and at the Maturity Date, the
interest payment in each instance to be that which has been earned and remains
unpaid. The rate of interest charged on the Loan shall be adjusted, effective on
the effective date of each change in the Index Rate.

     2.04 Provisions Relating to Interest. All Loans hereunder and outstanding
from time to time shall bear interest at a daily rate equal to the Floating
Rate, each such change in the rate of interest charged on the Loans to become
effective without notice to Borrower, on the effective date of each change in
the Index Rate, calculated on the basis of a year of three hundred sixty-five or
three hundred sixty-six (365 or 366) days, as applicable, from the date of
advance through the date of repayment.

     It is the intention of the parties hereto to comply strictly with the usury
laws of the State of Texas and the United States of America and, in this
connection, there shall never be collected, charged or received on any sums
advanced hereunder interest in excess of the Maximum Rate. For purposes of
Chapter 303 of the Texas Finance Code, as amended, Borrower agrees that the
maximum rate to be charged shall be the "indicated (weekly) rate ceiling" as
defined in said Chapter, provided that Bank may also rely to the extent
permitted by applicable laws of the State of Texas or the United States of
America, on alternative maximum rates of interest under other applicable laws of
the State of Texas or the United States of America applicable to Bank, if
greater. Upon the occurrence and during the continuation of an Event of Default
interest on the unpaid balance of the Loans shall accrue at a daily rate equal
to the Floating Rate plus five percent (5%) per annum, calculated on the basis
of a year of three hundred sixty-five or three hundred sixty-six (365 or 366)

                                       11
<PAGE>

days, as applicable, for the number of days elapsed, not to exceed the Maximum
Rate, if applicable. Notwithstanding anything herein or in the Note to the
contrary, during any Limitation Period, the interest rate to be charged on
amounts evidenced by the Note shall be the Maximum Rate and the obligation of
Borrower for any fees payable hereunder and deemed to be interest under
applicable law shall be suspended. During any period or periods of time
following a Limitation Period, to the extent permitted by applicable laws of the
State of Texas or the United States of America, the interest rate to be charged
hereunder shall remain at the Maximum Rate until such time as there has been
paid to Bank (a) the amount of interest in excess of the Maximum Rate that Bank
would have received during the Limitation Period had the interest rate remained
at the relevant Floating Rate and (b) all interest and fees otherwise due to
Bank but for the effect of such Limitation Period.

     If under any circumstances the aggregate amounts paid on the Note or under
this Agreement include amounts which by law are deemed interest and which would
exceed the amount permitted if the Maximum Rate were in effect, Borrower
stipulates that such payment and collection will have been and will be deemed to
have been, to the extent permitted by applicable laws of the State of Texas or
the United States of America, the result of mathematical error on the part of
both Borrower and Bank, and Bank shall promptly refund the amount of such excess
(to the extent only of such interest payments above the Maximum Rate which could
not lawfully have been collected and retained) upon discovery of such error by
Bank or notice thereof from Borrower.

     2.05 Advances to Satisfy Obligations of Borrower. Bank may, but shall not
be obligated to, make advances hereunder and apply same to the satisfaction of
any condition, warranty, representation or covenant of Borrower contained in
this Agreement, and the funds so advanced and applied shall be part of the Loan
proceeds advanced under this Agreement and evidenced by the Note.

     2.06 Mandatory Prepayment of the Note. In the event that Bank or Borrower
determine that a Loan Excess exists, Borrower shall immediately, but in no event
later than thirty (30) days following the earlier of either: (a) Borrower
becoming aware that a Loan Excess exists, or (b) notice from Bank of any such
determination, (i) prepay the principal of the Note in an aggregate amount at
least equal to such Loan Excess or (ii) add to the Borrowing Base Properties
additional Oil and Gas Properties of Borrower, or other collateral acceptable to
Bank in its sole discretion, sufficient in value, as determined by Bank in its
sole discretion pursuant to Section 2.07, to increase the Borrowing Base to
equal the unpaid principal amount of the Note plus all accrued, unpaid interest.

     Notwithstanding the foregoing provisions of this Section, however, at the
time that each Monthly Borrowing Base Reduction becomes applicable on the first
day of each calendar month, Borrower shall contemporaneously prepay so much of
the principal of the Note as is necessary to ensure that no Loan Excess results
from the application of such Monthly Borrowing Base Reduction. With respect to
any principal payment that is more than ten (10) days overdue, but prior to
Bank's acceleration of the maturity of any Indebtedness, Borrower shall be
assessed and shall be obligated to pay upon such assessment late charges equal
to five percent (5%) of the amount of such payment, but in no event to exceed
the Maximum Rate.

                                       12
<PAGE>

     2.07 Borrowing Base Determination. The initial Borrowing Base is hereby
established at $2,550,000 effective as of the date hereof, and the Borrowing
Base shall automatically be reduced effective on the first day of each month,
commencing October 1, 2002, by the amount of the Monthly Borrowing Base
Reduction. The Monthly Borrowing Base Reduction is hereby initially established
at Fifty Thousand Dollars ($50,000) and shall continue to be equal to $50,000
until such Monthly Borrowing Base reduction is redetermined by Bank, with the
next redetermination currently scheduled for December 1, 2002. Notwithstanding
the first two sentences of this Section 2.07, immediately upon the closing of
the transaction evidenced by the Big Wells PSA, such closing to be consummated
no later than September 1, 2002 for this sentence to become effective, including
the assignment of the Oil and Gas Properties described in Part Two of Schedule
1.01(a) attached hereto to Whittier Energy and the execution and delivery of the
Security Instruments from Whittier Energy to Bank covering such Oil and Gas
Properties as set forth in Section 3.17, the Borrowing Base shall be increased
to $3,850,000 effective as of such date, and the Borrowing Base shall
automatically be reduced, effective on the first day of each month, commencing
October 1, 2002 by the monthly Borrowing Base Reduction which shall be
established at Seventy Thousand Dollars ($70,000) and shall continue to be equal
to $70,000 until such Monthly Borrowing Base Reduction is redetermined by Bank.
Each time Bank redetermines the Borrowing Base and the Monthly Borrowing Base
Reduction, it shall do so in accordance with its customary lending practices in
effect from time to time, including Bank's customary credit approval practices
and procedures, as applied to its other borrowers with whom Borrower is
similarly situated. Borrower acknowledges that the Bank's determination of the
Borrowing Base and the Monthly Borrowing Base Reduction is not necessarily based
exclusively or principally on the value, for loan purposes, of the Borrowing
Base Properties, but instead such determination represents the Bank's overall
credit evaluation with respect to Borrower including Bank's assessment of the
value, for loan purposes, of the Borrowing Base Properties.

     On or before each October 1 and April 1until the Maturity Date, Borrower
shall furnish to Bank a report (the "Semi-Annual Report"), in form and substance
satisfactory to Bank, which report shall set forth, as of the preceding July 1
and January 1, respectively, such Borrowing Base Property Data as Bank may
request attributable to the Borrowing Base Properties. Each Annual Report that
is due on or before each April 1 shall be prepared by independent petroleum
engineers that are acceptable to Bank, and each Semi-Annual Report that is due
on or before each October 1 may be prepared by Borrower's own engineers and
shall be certified by an officer of Borrower. The Semi-Annual Report that is due
on or before April 1 of each year shall be provided in ARIES format, or other
electronic format acceptable to Bank in its discretion. Upon receipt of each
such Semi-Annual Report, Bank shall, in the normal course of business, make a
determination of the Borrowing Base and the Monthly Borrowing Base Reduction,
which shall become effective upon written notification from Bank to Borrower,
and which, subject to the other provisions of this Agreement, shall be the basis
on which the Borrowing Base shall thereafter be calculated, until the effective
date of the next redetermination of the Borrowing Base and the Monthly Borrowing
Base Reduction as set forth in this Section. Notwithstanding anything to the
contrary in this Section 2.07, in the event of any delay in the scheduled
redetermination of the Borrowing Base or the Monthly Borrowing Base Reduction,
the most recent Monthly Borrowing Base Reduction shall remain effective until
written notification from Bank to Borrower of such redetermination, if any.

                                       13
<PAGE>

     Borrower shall pay a fee of $3,500.00 at the time of Borrower's delivery to
Bank of each Semi-Annual Report and each time Borrower requests a
redetermination of the Borrowing Base pursuant to this Section 2.07. Each such
Engineering Fee is to be paid to Bank for Bank's analysis of each such
Semi-Annual Report and its redetermination of the Borrowing Base and Monthly
Borrowing Base Reduction.

     In addition to scheduled redeterminations of the Borrowing Base, either the
Borrower may request that the Bank redetermine, or the Bank may elect to
redetermine, the Borrowing Base and the Monthly Borrowing Base Reduction at any
time, and from time to time, which redetermination shall become effective upon
written notification from Bank to Borrower and which, subject to the other
provisions of this Agreement, shall be the basis on which the Borrowing Base
shall thereafter be calculated until the effective date of the next
redetermination of the Borrowing Base and the Monthly Borrowing Base Reduction,
as set forth in this Section.

     2.08 Assignment of Production. Certain of the Security Instruments covering
the Borrowing Base Properties contain an assignment unto and in favor of Bank of
all oil, gas and other minerals produced and to be produced from or attributable
to the Oil and Gas Properties that constitute part of the Borrowing Base
Properties, together with all of the revenues and proceeds attributable to such
production, and such Security Instruments further provide that all such revenues
and proceeds which may be so collected by Bank pursuant to the assignment shall
be applied to the payment of the Note and the satisfaction of all other
Indebtedness to be secured by such Security Instruments. Such Security
Instruments further provide that the Bank grants to Borrower a license to
receive and collect the revenues and proceeds attributable to such production
unless and until an the Bank, acting in its sole discretion, terminates
Borrower's license to collect such revenues and proceeds. Borrower hereby
appoints Bank as its agent and attorney-in-fact for all purposes deemed by Bank
to be necessary or desirable in connection with such assignment of production,
including, but not limited to, completing the letter transfer orders delivered
to Bank pursuant to Sections 3.14 and/or 3.16 hereof, which power is coupled
with an interest and is not revocable.

     2.09 Commitment Fee. As consideration for the commitment of Bank to make
Loans to Borrower through the Maturity Date pursuant to this Agreement, Borrower
agrees to pay to Bank within three (3) Business Days of receipt of Bank's
statement as to quarterly periods ending March 31, June 30, September 30 and
December 31 of each year (except the first period shall be for a period of time
from the Closing to September 30, 2002) during the period commencing on the date
of this Agreement to and including the Maturity Date and at the Maturity Date, a
fee equal to 1/2 of 1% per annum (computed on the basis of 365 or 366 days, as
the case may be) multiplied by an amount equal to the daily average excess, if
any, of the Revolving Commitment, over the aggregate principal amount
outstanding on the Note throughout the period from the date of this Agreement or
previous calculation date provided above, whichever is later, to the relevant
calculation date or the Maturity Date, as the case may be.

                                       14
<PAGE>

     2.10 Facility Fee. As consideration for the commitment of Bank to make
Loans to Borrower pursuant to this Agreement, Borrower shall pay to Bank a fee
("Facility Fee") of $25,500.00, one-half of which has been paid prior to
Closing, and the balance of which shall be paid simultaneously with the Closing.
Contemporaneously with any increase of the Borrowing Base above the initial
Borrowing Base available at Closing, Borrower shall pay to Bank an additional
Facility Fee equal to one percent (1.0%) of the amount by which such increased
Borrowing Base exceeds the highest Borrowing Base previously in effect under the
terms of this Agreement, such additional Facility Fees includes a Facility Fee
in the amount of $13,000 due by Borrower to Bank upon the closing of the Big
Wells PSA and the increase of the Borrowing Base contemporaneously therewith.

     2.11 Letters of Credit.

          (a) Subject to the terms and conditions of this Agreement, the Bank
     agrees to issue standby letters of credit ("Letter(s) of Credit") for the
     account of the Borrower from time to time following receipt, at least three
     (3) Business Days prior to the requested date of issuance, of Bank's
     then-current form of application for a Letter of Credit properly completed
     by Borrower in such amount as the Borrower may request not to exceed an
     aggregate amount outstanding equal to the unborrowed portion of the
     Revolving Commitment. The amount available to be drawn as Loans under the
     Revolving Commitment shall be reduced by the aggregate face amount of the
     outstanding Letters of Credit issued pursuant to this Section 2.11(a).

          (b) If there is any conflict between the terms of any Letter of Credit
     application accepted by the Bank and the terms of this Agreement, the terms
     of this Agreement shall control. No Letter of Credit shall have an
     expiration date that is later than one year from the date of its issuance,
     or, if sooner, beyond the Maturity Date.

     2.12 Repayment of Letters of Credit. If drawn upon by the beneficiary of a
Letter of Credit, all amounts so drawn shall be due and payable by the Borrower
immediately upon receipt of Bank's request therefor.

     2.13 Letter of Credit Fee. As consideration for the issuance by the Bank of
Letters of Credit for the account of the Borrower, the Borrower agrees to pay to
the Bank a fee of one and one-half percent (1.5%), per annum, of the amount of
each such Letter of Credit (subject to a $500.00 minimum fee per year on each
Letter of Credit), the first such per annum fee for each Letter of Credit to be
payable in advance of the issuance of such Letter of Credit, with successive per
annum fees to be paid in advance of the anniversary date of the issuance of such
Letter of Credit if it is to remain in effect beyond such anniversary date.

                                       15
<PAGE>

                             ARTICLE III. CONDITIONS

     The obligation of Bank to make the initial Loan referred to in Article II
of this Agreement on or about July 17, 2002 is subject to satisfaction of the
following conditions precedent stated in this Article III (except for Section
3.16). The obligation of Bank to make subsequent advances pursuant to this
Agreement is subject to the prior or contemporaneous satisfaction of the
conditions precedent stated in Sections 3.09 through 3.16 and also Section 3.17
with regard to any Loan, or portion thereof, attributable to the increased
Borrowing Base as set forth in the third sentence of Section 2.07.

     3.01 Receipt of Note, Agreement and Compliance Certificate. Bank shall have
received the Note, multiple counterparts of this Agreement, as requested by
Bank, and the Compliance Certificate duly executed by an authorized officer for
Borrower.

     3.02 Receipt of Assignment of Note, Liens and Security Interests. Bank
shall have received the Assignment of Note, Liens and Security Interests duly
executed by Equiva.

     3.03 Receipt of Organizational Documents. Bank shall have received from
Borrower its Governing Documentation certified by the secretary or assistant
secretary of such Borrower.

     3.04 Receipt of Certified Copy of Corporate Proceedings and Certificates of
Incumbency. Bank shall have received from Borrower copies of all resolutions of
its Governing Body authorizing the transactions set forth in this Agreement, and
the execution of this Agreement, the Note, and those of the Security Instruments
and other Loan Documents to which it is a party, such copy or copies to be
certified by the secretary or an assistant secretary of Borrower or its general
partner or manager, if applicable, as being true and correct and in full force
and effect as of the date hereof. In addition, Bank shall have received from
Borrower a certificate of incumbency signed by a secretary or an assistant
secretary of Borrower or its general partner or manager, if applicable, setting
forth (a) the names of the officers executing this Agreement, the Note, and
those of the Security Instruments and other Loan Documents to which it is a
party, (b) the office(s) to which such Persons have been elected and in which
they presently serve and (c) an original specimen signature of each such person.

     3.05 Receipt of Certificates of Authority and Certificates of Good
Standing. Bank shall have received certificates, as of the most recent dates
practicable, of the Secretary of State of the state in which Borrower is formed
attesting to Borrower's existence, and of each state in which Borrower is
qualified to do business as a foreign Business Entity, attesting to such
qualification, and from the Secretary State or the department of revenue or
taxation of each of the foregoing states, as applicable, as to the good standing
of Borrower in such state;

                                       16
<PAGE>

     3.06 UCC Search. The results of a Uniform Commercial Code search showing
all financing statements and other documents or instruments on file against
Borrower in the Office of the Secretary of State of the State of Texas and in
the counties in which Borrowing Base Properties are located, such search to be
as of a date no more than ten (10) days prior to the date of the advance of the
Loan.

     3.07 Fees. Bank shall have contemporaneously received the fee required by
Section 2.10.

     3.08 Use of Loan Proceeds. Bank shall receive evidence, contemporaneous
with making the initial Loan under Article II, that Borrower has used the
initial Loan proceeds advanced on or about July 17, 2002, (a) to pay all fees
due and payable hereunder, including, without limitation, those described in
Section 2.10 and Section 3.15, and (b) to cause Bank to receive from Equiva an
assignment of the Existing Indebtedness evidenced by the Equiva Note and the
Equiva Credit Agreement.

     3.09 Request for Advance. Bank shall have received from Borrower a Request
for Advance.

     3.10 Accuracy of Representations and Warranties and No Event of Default.
The representations and warranties contained in Article IV of this Agreement
shall be true and correct in all material respects on the date of the making of
such Loans or advances with the same effect as though such representations and
warranties had been made on such date; and no Event of Default shall have
occurred and be continuing or will have occurred at the completion of the making
of such Loans or advances.

     3.11 Legal Matters Satisfactory to Counsel to Bank. All legal matters
incident to the consummation of the transactions hereby contemplated shall be
satisfactory to counsel for Bank.

     3.12 No Material Adverse Change. No material adverse change shall have
occurred since the date of this Agreement in the condition, financial or
otherwise, of Borrower.

     3.13 Status of Title. Bank shall have been satisfied that Whittier Energy
has Marketable Title to its Borrowing Base Properties, that Whittier Energy owns
record title to an undivided net revenue interest in the production from each
Oil and Gas Property that is a Borrowing Base Property that is not less than the
net revenue interest therein attributed to Whittier Energy in the Loan
Documents, as amended from time to time, as well as (if applicable) an undivided
working interest in each such Oil and Gas Property that is not greater than the
working interest therein attributed to Whittier Energy in the Loan Documents, as
amended from time to time (unless there is a corresponding increase in the net
revenue interest attributed to such party therein).

     3.14 Security Instruments. As security for the payment of the Note and the
performance of the Obligations of Borrower under this Agreement, Bank shall have
received the Security Instruments, duly executed by Borrower with respect to the
Borrowing Base Properties.

                                       17
<PAGE>

     3.15 Legal Fees. All legal fees and disbursements owed to Bank's special
counsel who provided representation to the Bank in connection with this
Agreement or any amendment hereto and in connection with the review of title to
the Borrowing Base Properties shall have been paid.

     3.16 Documents Required for Subsequent Disbursements. As of the time of
funding any additional advances to Borrower that are made in conjunction with
the addition to the Borrowing Base Properties of Oil and Gas Properties owned by
Whittier Energy, Borrower shall have duly delivered to Bank: (i) the Security
Instruments that are necessary or appropriate, in the opinion of Bank, relating
to such additional Borrowing Base Properties, and (ii) Transfer Order Letters
applicable to the production of oil and gas from any additional Oil and Gas
Properties added to the Borrowing Base Properties.

     3.17 Big Wells Security Instruments. As of the time of funding any
additional advances to Borrower attributable to the increased Borrowing Base as
set forth in the third sentence of Section 2.07, Borrower shall have delivered
the items described in Section 3.16 above (or any amendments thereto) as they
relate to the Oil and Gas Properties under the Big Wells PSA and original
executed assignments covering the Oil and Gas Properties under the Big Wells
PSA. Upon the delivery of such instruments, all of Borrower's representations,
warranties and covenants hereunder relating to the initial Borrowing Base
Properties shall automatically apply to such additional Borrowing Base
Properties.

                   ARTICLE IV. REPRESENTATIONS AND WARRANTIES

     To induce Bank to enter into this Agreement and to make the Loan hereunder,
Borrower represents and warrants to Bank (which representations and warranties
will survive the delivery of the Note) that:

     4.01 Existence and Good Standing. Borrower is a Business Entity of the type
it is described to be in the preamble of this Agreement, duly organized, legally
existing and in good standing under the laws of its jurisdiction of formation
and is duly qualified and in good standing as a foreign Business Entity of that
type in all jurisdictions wherein the property owned or the business transacted
by it makes such qualification necessary, other than those jurisdictions wherein
the failure to so qualify does not have a material adverse effect on Borrower.

     4.02 Due Authorization. The execution and delivery by Borrower of this
Agreement and the borrowings hereunder; the execution and delivery by Borrower
of the Note, the Security Instruments and the other Loan Documents; and the
repayment by Borrower of Indebtedness evidenced by the Note and interest and
fees provided in the Note and this Agreement are (a) within the Corporate Power
of Borrower; (b) have been duly authorized by all necessary Corporate Action of
Borrower; and (c) do not and will not (i) require the consent of any regulatory
authority, governmental body, or any other Person, (ii) violate any provision of
law, the Certificate of Formation of Borrower, or the Governing Documentation of
Borrower, (iii) cause a default to occur under the terms and provisions of any
indenture, instrument or other agreement to which any Borrower is a party or by
which its property may be presently bound or encumbered, or (iv) result in or
require the creation or imposition of any mortgage, lien, pledge, security
interest, charge or other encumbrance in, upon or of any of the properties or
assets of Borrower under any such indenture, instrument or other agreement,
other than under any of the Security Instruments.

                                       18
<PAGE>

     4.03 Valid and Binding Obligations. This Agreement, the Note, the Security
Instruments and the other Loan Documents, when duly executed and delivered, will
be, as to each such instrument executed by Borrower, the legal, valid and
binding obligations of and enforceable against Borrower in accordance with their
respective terms (subject to any applicable bankruptcy, insolvency or other laws
of general application affecting creditors' rights and judicial decisions
interpreting any of the foregoing).

     4.04 Ownership of Borrowing Base Properties. Whittier Energy has Marketable
Title to all of its Borrowing Base Properties free and clear of all liens,
claims and encumbrances other than Permitted Encumbrances.

     4.05 Oil and Gas Leases. The Leases which constitute any part of the
Borrowing Base Properties are in full force and effect, are valid, subsisting
leases covering the entire estates to which they pertain and all rentals,
royalties and other amounts due and payable in accordance with the terms of the
Leases, overriding royalties, net profits or other production burdens have been
duly paid or provided for; the obligations to be performed under the Leases have
been duly performed; and Borrower is not aware of any default by any third party
under any of the Leases with respect to such third party's obligations.

     4.06 Interest in the Borrowing Base Properties. With respect to each of the
Borrowing Base Properties, the ownership of Whittier Energy in such property
will, with respect to the wells, units and/or tracts of land described in
Schedule 1.01(a) hereto in connection with such property, (i) entitle Whittier
Energy to receive (subject to the terms and provisions of this Agreement) a
decimal share of the oil and gas produced from, or allocated to, such wells,
units and/or tracts equal to not less than the decimal share set forth in
Schedule 1.01(a) in connection with such wells, units and/or tracts, and (ii)
cause Whittier Energy to be obligated to bear a decimal share of the cost of
exploration, development and operation of such wells, units and/or tracts of
land not greater than the decimal share set forth in Schedule 1.01(a) in
connection with such wells, units and/or tracts, unless any increase in Whittier
Energy's share of costs is accompanied by a pro-rata increase in Whittier
Energy's share of revenue. Except as set forth in the instrument and agreements,
if any, more particularly described in Schedule 1.01(a), all such shares of
production which Whittier Energy is entitled to receive, and shares of expenses
which Whittier Energy is obligated to bear, are not subject to change, except
for changes attributable to future elections by Whittier Energy not to
participate in operations proposed pursuant to customary forms of applicable
joint operating agreements, and except for changes attributable to changes in
participating areas under any federal units wherein participating areas may be
formed, enlarged or contracted in accordance with the rules and regulations of
the applicable governmental authority.

                                       19
<PAGE>

     4.07 Oil and Gas Contracts. Borrower is not obligated, by virtue of any
prepayment under any contract providing for the sale by Borrower of hydrocarbons
which contains a "take-or-pay" clause or under any similar prepayment agreement
or arrangement, including, without limitation, "gas balancing agreements", to
deliver a material amount of hydrocarbons produced from the Borrowing Base
Properties at some future time without then or thereafter receiving full payment
therefor (i.e., in the case of oil, not in excess of sixty (60) days, and in the
case of gas, not in excess of ninety (90) days). The Borrowing Base Properties
are not subject to any contractual, or other arrangement for the sale of crude
oil which cannot be canceled on ninety (90) days' (or less) notice, unless the
price provided for therein is equal to or greater than the prevailing market
price in the vicinity. The Borrowing Base Properties are not subject to any gas
sales contract that contains any material terms which are not customary in the
industry within the region in which the Borrowing Base Properties affected
thereby are located. The Borrowing Base Properties are not subject to any
regulatory refund obligation and no facts exist which might cause the same to be
imposed.

     4.08 Producing Wells. All producing wells located on the Borrowing Base
Properties have been, during all times that such were under the direction or
control of Borrower and, to the knowledge of Borrower, at all other times,
drilled, operated and produced in conformity in all material respects with all
Applicable Laws, rules, regulations and orders of all regulatory authorities
having jurisdiction, are subject to no penalties on account of past production,
and are bottomed under and are producing from, and the well bores are wholly
within, the Borrowing Base Properties or on Oil and Gas Properties which have
been pooled, unitized or communitized with the Borrowing Base Properties.

     4.09 Purchasers of Production. The persons who are purchasing Whittier
Energy's interests in oil and gas produced from the Borrowing Base Properties as
of the calendar month during which the Loans are made hereunder are identified
on Schedule 4.09 attached hereto.

     4.10 Scope and Accuracy of Financial Statements. All Financial Statements
submitted and to be submitted to Bank hereunder are and will be complete and
correct in all material respects; and do and will fairly reflect the financial
condition and the results of the operations of Borrower in all material respects
as of the dates and for the period stated therein (subject only to normal
year-end audit adjustments with respect to such unaudited interim statements of
Borrower); and no material adverse change has since occurred in the condition,
financial or otherwise, of Borrower.

     4.11 Liabilities, Litigation and Restrictions. Except as disclosed in the
Financial Statements, Borrower has no liabilities, direct or contingent, which
may materially and adversely affect the business or assets of Borrower. Except
as described on Schedule 4.11, there is no litigation or other action of any
nature pending before any court, governmental instrumentality, regulatory
authority or arbitral body or, to the knowledge of Borrower, threatened against
or affecting Borrower, which might reasonably be expected to result in any
material, adverse change in the business or assets of Borrower. No unusual or
unduly burdensome restriction, restraint or hazard exists by contract, law,
governmental regulation or otherwise relative to the business or material
properties of Borrower other than such as relate generally to Persons engaged in
the business activities conducted by Borrower.

                                       20
<PAGE>

     4.12 Margin Stock. None of the proceeds of the Loans will be used for the
purpose of buying or carrying margin stock.

     4.13 Authorizations and Consents. No authorization, consent, approval,
exemption, franchise, permit or license of, or filing with, any governmental or
public authority or any third party is required to authorize, or is otherwise
required in connection with the valid execution and delivery by Borrower of this
Agreement, the Note, and those of the Security Instruments to which it is a
party or any instrument contemplated hereby, the repayment by Borrower of
advances against the Note and interest and fees provided in the Note and this
Agreement, or the performance by Borrower of its obligations under any of the
foregoing.

     4.14 Compliance with Laws, Rules, Regulations and Orders. To the best of
the knowledge and belief of Borrower, neither the business nor any of the
activities of Borrower, as presently conducted, violates any law or any rule,
regulation or directive of any applicable judicial, administrative or other
governmental instrumentality (including, but not by way of limitation, any law
or any rule, regulation or directive of any judicial, administrative or other
governmental instrumentality relating to zoning, to any Environmental Law, to
the stabilization of wages or prices or to the development, production,
transportation or purchase or sale of oil, gas or other hydrocarbons) the result
of which violation would have a material adverse effect on Borrower, and
Borrower possesses all licenses, approvals, registrations, permits and other
authorizations necessary to enable it to carry on its business in all material
respects as now conducted, and all such licenses, approvals, registrations,
permits and other authorizations are in full force and effect; and Borrower has
no reason to believe that it will be unable to obtain the renewal of any such
licenses, approvals, registrations, permits and other authorizations.

     4.15 Proper Filing of Tax Returns and Payment of Taxes Due. Borrower has
duly and properly filed all United States Income Tax returns and all other tax
returns which are required to be filed, and has paid all taxes due from Borrower
pursuant to said returns or pursuant to any assessment received, except such
taxes, if any, as are being contested in good faith and as to which adequate
provisions and disclosures have been made; and the respective charges and
reserves on the books of Borrower with respect to any taxes or other
governmental charges are adequate.

     4.16 ERISA. Borrower is in compliance in all material respects with all
applicable provisions of ERISA. Neither a Reportable Event nor a Prohibited
Transaction has occurred and is continuing with respect to any plan; no notice
of intent to terminate a plan has been filed, nor has any plan been terminated;
no circumstances exist which constitute grounds under Section 4042 of ERISA
entitling the PBGC to institute proceedings to terminate, or appoint a trustee
to administrate a plan, nor has the PBGC instituted any such proceedings;
neither Borrower nor any ERISA Affiliate has completely or partially withdrawn
under Sections 4201 or 4204 of ERISA from a Multi-employer plan; Borrower and
each ERISA Affiliate have met their minimum funding requirements under ERISA
with respect to all of their plans and the present value of all vested benefits
under each plan exceeds the fair market value of all plan assets allocable to
such benefits, as determined on the most recent valuation date of the plan and
in accordance with the provisions of ERISA and the regulations thereunder for
calculating the potential liability of Borrower or any ERISA Affiliate to the
PBGC or the plan under Title IV of ERISA; and neither Borrower nor any ERISA
Affiliate has incurred any liability to the PBGC under ERISA.

                                       21
<PAGE>

     4.17 Investment Company Act Compliance. Borrower is not, nor is it directly
or indirectly controlled by or acting on behalf of any person or entity which
is, an investment company or an "affiliated person" of an investment company
within the meaning of the Investment Company Act of 1940, as amended.

     4.18 Public Utility Holding Company Act Compliance. Borrower is not a
"holding company", or an "affiliate" of a "holding company" or of a "subsidiary
company" of a "holding company", within the meaning of the Public Utility
Holding Company Act of 1935, as amended.

     4.19 Environmental Laws. To the best of the knowledge and belief of
Borrower:

          (a) no property of Borrower is currently on, or has ever been on, any
     federal or state list of superfund sites as listed on the Environmental
     Protection Agency National Priority List or any comparable state registries
     or list in any state of the United States (collectively "Superfund Sites");

          (b) no Hazardous Substances have in the past been generated,
     transported, and or disposed of, by Borrower at any Superfund Site;

          (c) except in accordance with a valid permit, license, certificate or
     approval of the relevant regulatory authority or governmental body, there
     has been no emission, spill, release, disposal or discharge of any
     Hazardous Substance into or upon (i) the air, (ii) soils or any
     improvements located thereon, (iii) surface water or groundwater, or (iv)
     the sewer, septic system or waste treatment, storage or disposal system
     servicing any property of Borrower; and

          (d) no complaint, order, directive, claim, citation, notice of
     environmental report, notice of investigation or other notice by any
     regulatory authority or governmental body or any other Person with respect
     to (i) air emissions, (ii) spills, releases or discharges to soils or any
     improvements located thereon, surface water, groundwater or the sewer,
     septic system or waste treatment, storage or disposal systems servicing any
     property of Borrower, (iii) solid or liquid waste disposal, (iv) the use,
     generation, storage, transportation or disposal of any Hazardous Substance,
     or (v) other environmental, health or safety matters affecting any property
     of Borrower, any improvements located thereon, or the business thereon
     conducted, has been received by Borrower, nor has Borrower been given oral
     or written notice thereof;

                                       22
<PAGE>

provided, however, that the representations and warranties set forth in
subparagraphs (c) and (d) above shall apply only to events and conditions which
either resulted in (i) a continuing lien or encumbrance on the property of
Borrower or (ii) otherwise materially affect Borrower's use or operation of
their respective property or Borrower's ability to repay the Indebtedness
evidenced by the Note.

     4.20 Existing Indebtedness. The Indebtedness to be refinanced by Borrower
with a portion of the Loan funds to be initially advanced pursuant to Section
2.01 is the Indebtedness described on Schedule 4.20 attached hereto ("Existing
Indebtedness").

     4.21 Subsidiaries. As of the date of Closing, Whittier Operating is a
wholly-owned Subsidiary of Whittier Energy, Whittier Energy owns no other
Subsidiaries other than Whittier Operating and Whittier Operating owns no
Subsidiaries.

     4.22 Investments. As of the date of Closing, Borrower (i) owns 173,625
shares and 543,850 shares of all the outstanding stock of PYR Energy
Corporation, a Maryland corporation, ("PYR Energy") and Chaparral Resources,
Inc., a Delaware corporation ("Chaparral"), respectively, (ii) such stock
ownership constitutes 0.7% and 1.42% of the total outstanding issued shares of
stock of PYR Energy and Chaparral, respectively, and (iii) no such shares of
stock are subject to any liens, contingent or otherwise, and Borrower possesses
and shall continue to possess full rights to pledge a security interest to Bank
covering such stock and all rights related thereto.

     4.23 Hedge Transactions. As of the Closing, all Hedge Transactions to which
Borrower is a party are described on Schedule 4.23 attached hereto and Borrower
has provided true and accurate copies of all such Hedge Transactions to Bank
prior to Closing.

                        ARTICLE V. AFFIRMATIVE COVENANTS

     Borrower covenants, so long as any Indebtedness of Borrower to Bank remains
unpaid under this Agreement or Bank remains obligated to make advances
hereunder, to:

     5.01 Use of Funds. Use the proceeds advanced under the Loan solely for the
purposes described on Schedule 5.01 attached hereto, and furnish Bank such
evidence as it may reasonably require with respect to such use.

                                       23
<PAGE>

     5.02 Maintenance and Access to Records. Keep adequate records in accordance
with good accounting practices, of all of Borrower's transactions so that at any
time, and from time to time, its true and complete financial condition may be
readily determined and, at Bank's reasonable request, make all financial records
and records relating to the Borrowing Base Properties available for Bank's
inspection and permit Bank to make and take away copies thereof for Bank's
internal use only and subject to such confidentiality agreements as Borrower may
reasonably require.

     5.03 Quarterly Financial Statements of Borrower. Deliver to Bank, on or
before the sixtieth (60th) day after the end of each of the calendar quarters of
each fiscal year, beginning with the quarter ending June 30, 2002, unaudited
Financial Statements of Borrower as at the end of such period and from the
beginning of such fiscal year to the end of the respective period, as
applicable, which Financial Statements shall be certified by the president, vice
president or chief financial officer of Borrower as being true and correct,
subject to changes resulting from year-end audit adjustments.

     5.04 Annual Financial Statements of Borrower. Deliver to Bank, on or before
the one hundred twentieth (120th) day after the close of each fiscal year of
Borrower, beginning with the fiscal year ending December 31, 2002, annual
audited Financial Statements of Borrower for such fiscal year.

     5.05 Quarterly Compliance Certificates. Deliver to Bank a Compliance
Certificate: (a) at the time of Borrower's execution of this Agreement, and (b)
at the time of delivery of each of the Financial Statements pursuant to Sections
5.03 (with respect to the first three calendar quarters of each fiscal year) and
5.04 above.

     5.06 Statement of Material Adverse Change in Condition. Deliver to Bank,
promptly upon any officer of the Borrower having knowledge of any material
adverse change in the condition, financial or otherwise, of Borrower (or any
event or circumstance that would result in any such material adverse change in
condition including, but not limited to, litigation and changes in business), a
statement of an officer of Borrower, setting forth the change in condition or
event or circumstance likely to result in any such change and the steps being
taken by Borrower or the applicable Subsidiary with respect to such change in
condition or event or circumstance.

     5.07 Additional Information. Furnish to Bank, promptly upon Bank's
reasonable request, such additional financial or other information concerning
the assets, liabilities, operations, and transactions of Borrower in Borrower's
possession or to which it has access, including, without limitation, information
concerning the Borrowing Base Properties.

     5.08 Compliance with Laws and Payment of Assessments and Charges. Comply
with all applicable statutes and government regulations, including, without
limitation, ERISA, and pay all taxes, assessments, governmental charges, claims
for labor, supplies, rent, its share of all costs and expenses incurred under
any joint operating agreement, and other obligations which, if unpaid, might
become a lien against its property, except any of the foregoing being contested
in good faith and as to which satisfactory accruals have been provided and
unless failure to comply or pay would not have a material adverse effect on the
assets of Borrower and its Subsidiaries (taken as a whole).

                                       24
<PAGE>

     5.09 Maintenance of Existence and Good Standing. Maintain Borrower's
Business Entity existence and good standing in the jurisdiction of its
formation, and in all jurisdictions wherein the property now owned or hereafter
acquired or business now or hereafter conducted necessitates same, other than
those jurisdictions wherein the failure to so qualify will not have a material
adverse effect on Borrower.

     5.10 Further Assurances. Promptly cure any defects in the execution and
delivery of this Agreement, the Note, the Security Instruments or any other
instrument referred to herein or executed in connection with the Note, and upon
notice, immediately execute and deliver to Bank, all such other and further
instruments as may be reasonably required by Bank from time to time in
compliance with the covenants and agreements made in this Agreement.

     5.11 Initial Expenses of Bank. Pay all fees and expenses of special legal
counsel for Bank, incurred in connection with the negotiation and preparation of
this Agreement, the Note, the Security Instruments or any other instrument
referred to herein or executed in connection with the Note, the satisfaction of
the conditions precedent set forth in Article III of this Agreement and the
consummation of the transactions contemplated in this Agreement.

     5.12 Subsequent Expenses of Bank. Upon request, promptly reimburse Bank for
all reasonable amounts expended, advanced or incurred by Bank to collect the
Note or to enforce the rights of Bank under this Agreement, the Note, the
Security Instruments or any other instrument referred to herein or executed in
connection with the Note, which amounts shall be deemed compensatory in nature
and liquidated as to amount upon notice to Borrower by Bank and which amounts
will include, but not be limited to, (a) all court costs, (b) attorneys' fees,
(c) fees of auditors and accountants, (d) investigation expenses, (e) internal
fees of Bank's in-house legal counsel, (f) fees and expenses incurred in
connection with Bank's participation as a member of the creditors' committee in
a case commenced under Title 11 of the United States Code or other similar law
of the United States, the State of Texas or any other jurisdiction, (g) fees and
expenses incurred in connection with lifting the automatic stay prescribed in
ss.ss.362 Title 11 of the United States Code, and (h) fees and expenses incurred
in connection with any action pursuant to ss.ss.1129 Title 11 of the United
States Code, incurred by Bank in connection with the collection of any sums due
under this Agreement, together with interest at the Floating Rate per annum,
calculated on a basis of a year of three hundred sixty-five (365) or three
hundred sixty-six (366) days, on each such amount from the date of notification
to Borrower that the same was expended, advanced or incurred by Bank until the
date it is repaid to Bank, with the obligations under this Section 5.12,
surviving the non-assumption of this Agreement in a case commenced under Title
11 of the United States Code or other similar law of the United States, the
State of Texas or any other jurisdiction and being binding upon Borrower or a
trustee, receiver or liquidator of any such party appointed in any such case.

                                       25
<PAGE>

     5.13 Maintenance of Tangible Property. Maintain all of Borrower's tangible
property in good repair and condition and make all necessary replacements
thereof and operate such property in a good and workmanlike manner in accordance
with standard industry practices, unless the failure to do so would not have a
material adverse effect on Borrower or the value of the Borrowing Base
Properties.

     5.14 Maintenance of Insurance. Continue to maintain, or cause to be
maintained, insurance with respect to the properties and business of Borrower
against such liabilities, casualties, risks and contingencies and in such
amounts as is customary in the industry, in an amount and form, and underwritten
by an insurer or insurers, as are acceptable to Bank in its sole discretion, and
furnish to Bank, at the execution of this Agreement and annually thereafter,
certificates evidencing such insurance.

     5.15 Inspection of Tangible Assets/Right of Audit. Permit (or cause to be
permitted) any authorized representative of Bank, to visit and inspect (at the
risk of Bank and/or such representative but otherwise at Borrower's expense) any
tangible asset of Borrower, and/or to audit the books and records of Borrower
during normal business hours.

     5.16 Payment of Note and Performance of Obligations. As to Borrower, pay
the Note according to the reading, tenor and effect thereof, as modified hereby,
and do and perform every act and discharge all of the Obligations provided to be
performed and discharged hereunder.

     5.17 ERISA Reports. Promptly after the filing or receiving thereof, copies
of all reports, including annual reports, and notices which Borrower files with
or receives from the PBGC or the U.S. Department of Labor under ERISA; and
promptly after Borrower knows or has reason to know that any Reportable Event or
Prohibited Transaction has occurred with respect to any plan or that the PBGC or
Borrower has instituted or will institute proceedings under Title IV of ERISA to
terminate any plan, Borrower will deliver to Bank a certificate of the
controller of Borrower setting forth details as to such Reportable Event or
Prohibited Transaction or plan termination and the action Borrower proposes to
take with respect thereto.

     5.18 Compliance with Laws. Comply in all material respects with any and all
material requirements of law, including, without limitation, Environmental Laws,
(a) related to any natural or environmental resource or media located on, above,
within, in the vicinity of, related to or affected by any Borrowing Base
Properties or any other property of Borrower, or (b) required for the
performance or conduct of its operations, including, without limitation, all
permits, licenses, registrations, approvals and authorizations, and, in this
regard, comply fully and in a timely manner with, and cause all employees, crew
members, agents, contractors, subcontractors and future lessees (pursuant to
appropriate lease provisions) of Borrower while such Persons are acting within
the scope of their relationship with Borrower, to so comply with, all
requirements of law, including, without limitation, Environmental Laws, and
other requirements with respect to the property of Borrower and the operation
thereof necessary or appropriate to enable Borrower to fulfill its obligations
under all requirements of law, including, without limitation, Environmental
Laws, applicable to the use, generation, handling, storage, treatment, transport
and disposal of any Hazardous Substances now or hereafter located or present on
or under any such property.

                                       26
<PAGE>

     5.19 Hazardous Substances Indemnification. Indemnify and hold Bank harmless
from and against any and all claims, losses, damages, liabilities, fines,
penalties, charges, administrative and judicial proceedings and orders,
judgments, remedial actions, requirements and enforcement actions of any kind,
and all costs and expenses incurred in connection therewith (including, without
limitation, attorneys' fees and expenses), arising directly or indirectly, in
whole or in part, out of (a) the presence of any Hazardous Substances on, under
or from its property, whether prior to or during the term hereof, or (b) any
activity carried on or undertaken on or off its property, whether prior to or
during the term hereof, and whether by Borrower or any predecessor in title or
any employees, agents, contractors or subcontractors of Borrower or any
predecessor in title, or any third Persons at any time occupying or present on
such property, in connection with the handling, treatment, removal, storage,
decontamination, cleanup, transportation or disposal of any Hazardous Substances
at any time located or present on or under such property; with the foregoing
indemnity further applying to any residual contamination on or under the
property of Borrower, or any property of any other Person, or affecting any
natural resources, and to any contamination of any property or natural resources
arising in connection with the generation, use, handling, storage,
transportation or disposal of any Hazardous Substances, irrespective of whether
any of such activities were or will be undertaken in accordance with applicable
requirements of law, including, without limitation, Environmental Laws, and
surviving satisfaction of all Indebtedness of Borrower to Bank and the
termination of this Agreement, provided, further, that the claims and other
actions of any kind against Bank which give rise to such indemnity are not
barred by the applicable statute of limitations at the time such claims or
actions are instituted and such indemnity shall not extend to any act or
omission by Bank or any Affiliate of Bank or any of Bank's employees or agents
with respect to the relevant property subsequent to Bank becoming the owner of,
taking possession of to the exclusion of Borrower or assuming operations of any
property previously owned by Borrower and with respect to which property such
claim, loss, damage, liability, fine, penalty, charge, proceeding, order,
judgment, action or requirement arises subsequent to the acquisition of title
thereto, taking possession thereof or assumption of operations thereon by Bank
or any Affiliate of Bank or any of Bank's employees or agents. Notwithstanding
anything herein to the contrary, the provisions of this Section 5.19 shall
survive any termination of this Agreement and shall survive the payment and
performance in full of all Obligations owed by Borrower to Bank. The amount of
any loss for which indemnification is provided under this Agreement shall be net
of (i) any tax benefit (such as a deduction, credit or deferral) actually
realized by the Bank from any loss, (ii) any amounts recovered by the Bank
pursuant to any indemnification by or indemnification agreement with any third
party (net of all unreimbursed costs and expenses incurred in achieving such
recovery), and (iii) any insurance proceeds or other cash receipts or
reimbursement received by the Bank from any third party as an offset against
such loss.

                                       27
<PAGE>

     5.20 Operating Accounts. Maintain all principal operating accounts of
Borrower with Bank.

     5.21 Changes in Management. Provide written notice to Bank promptly upon
the occurrence of any change in the Persons who serve as directors, managers or
officers of Borrower and/or of the director, manager and/or officer position(s)
held by any of such Persons.

     5.22 Proceeds from Hedging Transactions. Following the occurrence and
during the continuation of any Unmatured Event of Default relating to Borrower's
obligations under Section 2.06 or any Event of Default, promptly deliver to Bank
one hundred percent (100%) of all proceeds received by Borrower or, if not
received, cause to be delivered to Bank all proceeds which Borrower is entitled
to receive arising from the early termination of any Hedging Transaction, such
proceeds to be applied against the outstanding balance owing on the Note.

     5.23 Production Reports. Deliver to Bank, on or before the sixtieth (60th)
day after the end of each calendar quarter, a quarterly report of oil, gas and
liquids production volumes by major field and the total production of all fields
during such calendar quarter, lease operating expenses by major field and total
lease operating expenses of all fields during such calendar quarter, and
production taxes (on a combined basis) attributable to the oil, gas and liquids
production during such calendar quarter. Unless and until Bank requests
otherwise in writing, Borrower may satisfy its obligations under this Section by
submitting to Bank for each relevant period the form of lease operating
statement routinely maintained by Borrower with respect to its operations on and
production from the Borrowing Base Properties, but following written request
from Bank, Borrower shall modify or supplement such report(s) as necessary to
provide any related information desired by the Bank.

     5.24 Hedging Transaction Reports. For each Hedging Transaction to which
Borrower is a party, if any, deliver to Bank, (i) on or before the fifth (5th)
day after entering into any such Hedging Transaction or entering into any
amendment or cancellation of any such Hedging Transaction copies of all
documents relating to such Hedging Transaction, amendment or cancellation
thereof, and (ii) on or before the sixtieth (60th) day after the end of each
calendar month, a detailed report setting out Borrower's position as of the end
of such calendar month including, but not limited to, Borrower's settlement
payments and receipts during such calendar month and settlement payables and
receivables as of the end of such calendar month.

     5.25 Aged Accounts Reports. Deliver to Bank, on or before the sixtieth
(60th) day after the end of each calendar quarter, a detailed aging accounts
receivable report and a detailed aging accounts payable report effective as of
the end of such calendar quarter in accordance with the invoice dates of such
accounts payable, such report to include, but not be limited to, unpaid royalty
obligations and amounts owed to operators, including contract operators, all
such reports to be prepared in accordance with GAAP.

                                       28
<PAGE>

     5.26 Payment of Contract Operators. Pay, within thirty (30) days after the
receipt of any billings or sooner if so required by the terms of any applicable
operating agreement, all fees, expenses and charges due from Borrower to
operators and/or contract operators (as such terms are generally understood in
the oil and gas industry) for operations provided by operators and/or contract
operators relating to the Borrowing Base Properties, except any such fees that
are diligently being contested in good faith by appropriate proceedings.

     5.27 Payment of Royalties. Pay, within sixty (60) days after the last day
of each calendar month or sooner if so required by any applicable lease or
statute, all royalties, overriding royalties, production payments or other
payments payable by Borrower to the owners of such interests in the Borrowing
Base Properties and any other Oil and Gas Properties owned by Borrower with
respect to oil and gas produced during such calendar month, unless Borrower has
created and maintains a suspense account for separate accounting of any such
payments that are payable but not yet due under the terms of the applicable
lease and applicable laws. Any such payments made into such suspense account
shall be accounted for in accordance with all applicable laws of the state in
which the Borrowing Base Properties or any other Oil and Gas Properties owned by
Borrower to which such payment relates are located.

     5.28 Tangible Net Worth Requirements. Borrower shall maintain a total
Tangible Net Worth of not less than $4,900,000.00, plus: (a) fifty percent (50%)
of net income (excluding losses) of Borrower commencing with the quarter ending
September 30, 2002, and (b) one hundred percent (100%) of any increases in
shareholders' equity resulting from the sale or issuance of equity interests in
Borrower commencing with the quarter ending September 30, 2002.

     5.29 EBITDAX to Interest Expense Ratio. Borrower will maintain (calculated
in accordance with GAAP) a ratio of quarterly EBITDAX to quarterly Interest
Expense of not less than 3.00. Compliance with this covenant shall begin with
the quarter ending September 30, 2002. For the purposes of calculating this
ratio:

          (a) "EBITDAX" shall be defined as the sum of net income before
     interest expenses, taxes, depreciation, depletion, amortization,
     exploration costs and other non-cash expenses less non-cash income of
     Borrower and less any capitalized expenses, and

          (b) "Interest Expense" shall be defined as the sum of all cash
     interest amounts (including any capitalized interest payments) required to
     be paid by Borrower during such quarter on all of its Indebtedness
     including, but not limited to, the Indebtedness evidenced by the Note.

     5.30 Current Ratio. Borrower shall maintain a ratio of Current Assets to
Current Liabilities (each defined in accordance with GAAP) of at least
one-to-one, determined quarterly beginning with the quarter ending June 30,
2002. For purposes of this ratio, Current Assets shall include unused
availability under the Revolving Commitment but shall exclude assets accounted
for in accordance with Financial Accounting Standards 133 under GAAP and Current
Liabilities shall exclude current maturities of the Loans and any liabilities
accounted for in accordance with Financial Accounting Standards 133 under GAAP.

                                       29
<PAGE>

     5.31 Additional Collateral. If, within 90 days of Closing, Borrower has not
added Oil and Gas Properties satisfactory to Bank in its discretion to the
Borrowing Base Properties with a PW9 of at least $1,000,000, Borrower shall
grant Bank a first priority security interest in all of Borrower's stock
ownership in PYR Energy and Chaparral as described in Section 4.23 above and
Borrower shall execute and deliver any and all Loan Documents requested by Bank
in connection therewith.

     5.32 East Hamel Borrowing Base Properties. Within 60 days of Closing,
Borrower shall provide to Bank satisfactory evidence, in Bank's sole discretion,
that Whittier Energy has been unconditionally conveyed the interests in the
Borrowing Base Properties described on Schedule 1,01(a) as the East Hamel
properties.

                         ARTICLE VI. NEGATIVE COVENANTS

     Without the prior written consent of Bank and so long as any part of the
principal or interest on the Note shall remain unpaid or Bank remains obligated
to make advances hereunder, Borrower and its Subsidiaries will not:

     6.01 Loans, Advances, or Investments. Make or agree to make or allow to
remain outstanding any loans or advances to any Person, including Affiliates of
Borrower, or make Investments in or purchase or otherwise acquire all or
substantially all of the assets of any Person, or any shares of stock of, or
similar interest in, any Person, in amounts which exceed $150,000 in the
aggregate for any and all of the foregoing, except (i) advances or extensions of
credit in the form of accounts receivable incurred in the ordinary course of
business, (ii) advances made by Borrower in its capacity as operator of oil, gas
and other mineral properties for the benefit of the working interest owners
pursuant to standard industry practices and (iii) Whittier Energy's Investment
in those certain Persons described on Schedule 6.01 attached hereto.

     6.02 Mortgages or Pledges of Assets. Create, incur, assume or permit to
exist, any mortgage, pledge, security interest, lien or encumbrance on any of
its properties or assets (now owned or hereafter acquired) including, without
limitation, the collateral covered by the Security Instruments, and Borrower's
stock in PYR Energy or Chapparal, except that the foregoing restrictions shall
not apply to any matters that would constitute or result in Permitted
Encumbrances.

     6.03 Nature of Business. Make or allow to occur any material change in the
character of its business as conducted as of the date hereof.

     6.04 Sales of Assets. Except as specifically provided for herein, sell,
lease, assign, transfer or otherwise dispose of, in one or any series of related
transactions, all or any part of its assets, if such transfer is material to
Borrower's operations, nor enter into any arrangement, directly or indirectly,
with any Person to sell and rent or lease back such assets or any part thereof
which are intended to be used for substantially the same purpose or purposes as
the assets sold or transferred, provided that if any such transaction occurs or
the proceeds thereof are received by Borrower at any time when a Loan Excess
exists, all such proceeds shall immediately be paid to Bank, not to exceed the
amount necessary to repay such Loan Excess. Upon request of Borrower, so long as
no Event of Default or Unmatured Event of Default exists, Bank shall consent to
the sale of assets having a value not to exceed 10% of the net present value of
the Borrowing Base Properties' then current value, as determined by the Bank in
its sole discretion, provided, however, that the Borrowing Base shall be reduced
accordingly, and, if any such reduction creates a Loan Excess, the proceeds of
such sale shall be applied to eliminate any such Loan Excess.

                                       30
<PAGE>

     6.05 Payment of Accounts Payable. Allow any account payable to remain
unpaid after its due date, except such as are overdue and being contested in
good faith, and as to which adequate provision or accrual has been made.

     6.06 Cancellation of Insurance. Allow any insurance policy required to be
carried hereunder to be terminated or lapse or expire without provision for
adequate renewal thereof.

     6.07 Changes in Business Structure. Consolidate or merge with any
corporation, firm, association or enterprise, or allow any such entity to be
merged into Borrower, unless Borrower is the surviving entity of such merger,
nor shall Borrower dissolve or liquidate.

     6.08 Creation of New Subsidiaries. Form any new Subsidiaries without the
prior written consent of Bank.

     6.09 Management and Shareholder Control. Cause or permit the Whittier
Family Group to owns less than fifty-one percent (51%) of the total equity or
the voting stock of either Whittier Energy or Whittier Operating.

     6.10 Transactions with Affiliates. Enter into any transaction between or
among Borrower and any of its Affiliate(s) on terms that are less favorable than
could be obtained in an arms-length transaction with a Person that is not an
Affiliate.

     6.11 Hedging Transactions. (a) Enter into any Hedging Transaction except
for Hedging Transactions that are: (i) based on monthly notional volumes that do
not exceed, in the aggregate, eighty percent (80%) of Borrower's share of
production attributable to Proved Developed Producing Reserves for such month as
estimated and utilized by Bank in its most recent reevaluation of the Borrowing
Base, (ii) based on "strike prices" that are equal to or greater than the prices
utilized by Bank in its most recent reevaluation of the Borrowing Base, (iii)
with a counterparty that has been rated by Standard & Poor's Ratings Group or
Moody's Investors Services, Inc. as investment grade or otherwise has been
approved in writing by Bank, and (iv) subject to a security interest granted by
Borrower to Bank pursuant to Security Instruments acceptable to Bank, in its
discretion, or (b) terminate, cash out or otherwise extinguish any material
portion of Borrower's then existing Hedge Transactions.

                                       31
<PAGE>

     6.12 Dividends and Distributions. Declare or pay any dividend from Borrower
or make any distribution on, or purchase, redeem or otherwise acquire for value,
any interest in Borrower.

     6.13 Other Indebtedness. Incur, create, assume or suffer to exist any
Indebtedness, whether by way of loan or the issuance of sale of securities
except (a) Loans hereunder, (b) loans by Bank under other credit arrangements,
(c) Indebtedness owed to Bank by any Affiliates of Borrower and (d) unsecured
accounts payable incurred in the ordinary course of business which are not
overdue, or if overdue, are being contested in good faith by appropriate
proceedings.

                         ARTICLE VII. EVENTS OF DEFAULT

     7.01 Enumeration of Events of Default. Any of the following events shall be
considered an Event of Default as that term is used herein:

          (a) Default shall be made by Borrower in the payment of any
     installment of principal on the Note;

          (b) Default shall be made by Borrower in the payment of any
     installment of interest on the Note, or any fees or other monetary
     obligation payable hereunder, and such default shall remain unremedied in
     excess of five (5) days after notice being given by Bank;

          (c) Default shall be made by Borrower in the due observance or
     performance of any affirmative covenant required in this Agreement, the
     Note, or the Security Instruments, and such default shall remain unremedied
     for in excess of thirty (30) days after the earlier of: (i) such default
     becoming known to Borrower, or (ii) notice being given by Bank;

          (d) Default shall be made by Borrower in the due observance or
     performance of any negative covenant required in this Agreement, the Note,
     or the Security Instruments;

          (e) Any representation or warranty herein made by Borrower proves to
     have been untrue in any respect material to Borrower, or any
     representation, statement (including Financial Statements), certificate or
     data furnished or made by Borrower to Bank in connection herewith proves to
     have been untrue in any respect material to Borrower as of the date the
     facts therein set forth were stated or certified;

          (f) Default shall be made by Borrower (as principal or guarantor or
     other surety) in payment or performance of any bond, debenture, note or
     other evidence of Indebtedness for borrowed money, or any other credit
     agreement, loan agreement, indenture, promissory note or similar agreement
     or instrument executed in connection with any of the foregoing in excess of
     $100,000 in the aggregate; and such default shall remain unremedied for in
     excess of the period of grace, if any, with respect thereto, with the
     effect of accelerating the maturity of any such Indebtedness;

                                       32
<PAGE>

          (g) Borrower applies for or consents to the appointment of a receiver,
     trustee or liquidator of it or all or a substantial part of its assets, or
     (ii) files a voluntary petition commencing a case under Title 11 of the
     United States Code, seeking liquidation, reorganization or rearrangement or
     taking advantage of any bankruptcy, insolvency, debtor's relief or other
     similar law of the United States, the State of Texas or any other
     jurisdiction, or (iii) makes a general assignment for the benefit of
     creditors, or (iv) is unable, or admits in writing its inability to pay its
     debts generally as they become due, or (v) files an answer admitting the
     material allegations of a petition filed against it in any case commenced
     under Title 11 of the United States Code or any reorganization, insolvency,
     conservatorship or similar proceeding under any bankruptcy, insolvency,
     debtor's relief or other similar law of the United States, the State of
     Texas or any other jurisdiction;

          (h) An order, judgment or decree shall be entered against Borrower by
     any court of competent jurisdiction or by any other duly authorized
     authority, on the petition of a creditor or otherwise, granting relief
     under Title 11 of the United States Code or under any bankruptcy,
     insolvency, debtor's relief or other similar law of the United States, the
     State of Texas or any other jurisdiction, approving a petition seeking
     reorganization or an arrangement of its debts or appointing a receiver,
     trustee, conservator, custodian or liquidator of it or all or any
     substantial part of its assets, and the failure to have such order,
     judgment or decree dismissed within thirty (30) days of its entry; or

          (i) Borrower has concealed, removed, or permitted to be concealed or
     removed, any part of its property, with intent to hinder, delay or defraud
     its creditors or any of them; or has made or suffered a transfer of any of
     its property which may be fraudulent under any bankruptcy, fraudulent
     conveyance or similar law; or has made any transfer of its property to or
     for the benefit of a creditor at a time when other creditors similarly
     situated have not been paid; or has suffered or permitted, while insolvent,
     any creditor to obtain a lien upon any of its property through legal
     proceedings or distraint which is not vacated within thirty (30) days from
     the date thereof.

     7.02 Rights Upon Default. Upon the happening of an Event of Default
specified in Subsections 7.01(g) or (h), the entire aggregate principal amount
of all Indebtedness then outstanding hereunder and the interest accrued thereon
shall automatically become immediately due and payable, and upon the happening
and continuation of any other Event of Default, Bank may declare the entire
aggregate principal amount of all Indebtedness then outstanding hereunder and
the interest accrued thereon immediately due and payable. In either case, the
entire principal and interest shall thereupon become immediately due and
payable, without notice (including, without limitation, notice of intent to
accelerate maturity or notice of acceleration of maturity) and without
presentment, demand, protest, notice of protest or other notice of default or
dishonor of any kind, except as provided to the contrary elsewhere herein, all
of which are hereby expressly waived by Borrower.

                                       33
<PAGE>

     7.03 Rights Upon Unmatured Event of Default. At any time that there exists
an Unmatured Event of Default, any obligation of the Bank hereunder to make
advances to or for the benefit of the Borrower shall be suspended unless and
until the Bank shall reinstate the same in writing, the Unmatured Event of
Default shall have been waived by the Bank or the relevant Unmatured Event of
Default shall have been remedied prior to the ripening into an Event of Default.

     Upon the happening and continuation of any Event of Default, all
obligations (if any) of Bank hereunder shall immediately cease and terminate
unless and until Bank shall reinstate the same in writing.

                           ARTICLE VIII. MISCELLANEOUS

     8.01 Security Interests in Deposits and Right of Offset or Banker's Lien.
Borrower hereby transfers, assigns and pledges to Bank and/or grants to Bank a
security interest (as security for the payment and/or performance of the
obligations of Borrower under this Agreement and the Note, with such interest of
Bank to be retransferred, reassigned and/or released by Bank at the expense of
Borrower upon payment in full and/or complete performance by Borrower of all
such obligations) and the right, exercisable at such time as any obligation
hereunder shall mature, whether by acceleration of maturity or otherwise of
offset or banker's lien against all funds or other property of Borrower now or
hereafter or from time to time on deposit with or in the possession of Bank,
including, without limitation, all certificates of deposit and other depository
accounts.

     8.02 Survival of Representations, Warranties and Covenants. All
representations and warranties of Borrower and all covenants and agreements

herein made shall survive the execution and delivery of the Note and this
Agreement and shall remain in force and effect so long as any debt is
outstanding under the Note, or any renewal or extension of this Agreement or the
Note, or Bank remains obligated to make advances hereunder.

     8.03 Notices and Other Communications. Notices, requests and communications
hereunder shall be in writing and shall be sufficient in all respects if
delivered to the relevant address indicated below (including delivery by
registered or certified United States mail, telex, telegram or hand):

                                       34
<PAGE>

          (a) If to Bank:

              COMPASS BANK
              24 Greenway Plaza, Suite 1400A
              Houston, Texas 77046
              Attention:  Energy Banking
              Fax:  (713) 968-8292

          (b) If to Borrower:

              WHITTIER ENERGY COMPANY
              7770 El Camino Real
              Carlsbad, California 92009
              Attention: Mr. Bryce W. Rhodes
              Fax: (760) 943-3938

     Any party may, by proper written notice hereunder to the other, change the
individuals or addresses to which such notices to it shall thereafter be sent.

     8.04 Renewals and Extensions. All provisions of this Agreement relating to
the Note shall apply with equal force and effect to each and all promissory
notes hereafter executed which in whole or in part represent a renewal,
extension, amendment, modification or rearrangement of any part of the
Indebtedness originally represented by the Note.

     8.05 No Waiver by Bank. No course of dealing on the part of Bank, its
officers or employees, nor any failure or delay by Bank with respect to
exercising any of its rights, powers or privileges under this Agreement, the
Note, the Security Instruments or any other instrument referred to herein or
executed in connection with the Note shall operate as a waiver thereof. The
rights and remedies of Bank under this Agreement, the Note, the Security
Instruments or any other instrument referred to herein or executed in connection
with the Note shall be cumulative and the exercise or partial exercise of any
such right or remedy shall not preclude the exercise of any other right or
remedy. In the event that Borrower is unable to satisfy any covenant, warranty
or condition herein, no advance of loan proceeds by Bank shall have the effect
of precluding Bank from thereafter declaring any such continuing inability to be
an Event of Default as hereinabove provided.

     8.06 INDEMNIFICATION. BORROWER HEREBY RELEASES AND AGREES TO INDEMNIFY AND
HOLD BANK AND ITS OFFICERS, EMPLOYEES, DIRECTORS, AGENTS AND ATTORNEYS
(COLLECTIVELY THE "BANK PARTIES") HARMLESS, FROM AND AGAINST ALL CLAIMS,
DAMAGES, LIABILITIES AND EXPENSES, KNOWN OR UNKNOWN, ACCRUED AND UNACCRUED,
INCLUDING ANY OF THE FOREGOING ALLEGED TO HAVE RESULTED FROM NEGLIGENCE OF ANY
OF THE BANK PARTIES, UNLESS ATTRIBUTABLE TO BANK PARTIES' OWN GROSS NEGLIGENCE
OR WILFUL MISCONDUCT, THAT MAY NOW OR HEREAFTER BE ASSERTED AGAINST ANY OF BANK
PARTIES IN CONNECTION WITH OR ARISING OUT OF ANY INVESTIGATION, LITIGATION OR
PROCEEDING DIRECTLY OR INDIRECTLY RELATING TO OR ARISING OUT OF ANY OF THE
TRANSACTIONS CONTEMPLATED BY THIS AGREEMENT.

                                       35
<PAGE>

     8.07 GOVERNING LAW. THIS AGREEMENT AND THE NOTE SHALL BE DEEMED TO BE
CONTRACTS MADE UNDER AND SHALL BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY
THE LAWS OF THE STATE OF TEXAS.

     8.08 Incorporation of Exhibits and Schedules. The Exhibits and Schedules
attached to this Agreement are incorporated herein for all purposes and shall be
considered a part of this Agreement.

     8.09 Survival Upon Unenforceability. In the event any one or more of the
provisions contained in this Agreement, the Note, the Security Instruments or in
any other instrument referred to herein or executed in connection with the Note
shall, for any reason, be held to be invalid, illegal or unenforceable in any
respect, such invalidity, illegality or unenforceability shall not affect any
other provision hereof or of any other instrument referred to herein or executed
in connection herewith.

     8.10 Rights of Third Parties. All provisions herein are imposed solely and
exclusively for the benefit of Bank and Borrower and no other Person shall have
standing to require satisfaction of such provisions in accordance with their
terms or be entitled to assume that Bank will refuse to make advances in the
absence of strict compliance with any or all thereof and any or all of such
provisions may be freely waived in whole or in part by Bank at any time if in
its sole discretion it deems it advisable to do so.

     8.11 Amendments or Modifications of this Agreement. Neither this Agreement
nor any provision hereof may be changed, waived, discharged or terminated
orally, but only by an instrument in writing signed by the party against whom
enforcement of the change, waiver, discharge or termination is sought.

     8.12 Agreement Construed as an Entirety. This Agreement, for convenience
only, has been divided into Articles and Sections and it is understood that the
rights, powers, privileges, duties and other legal relations of the parties
hereto shall be determined from this Agreement as an entirety and without regard
to the aforesaid division into Articles and Sections and without regard to
headings prefixed to said Articles or Sections.

     8.13 Number and Gender. Whenever the context requires, reference herein
made to the single number shall be understood to include the plural and likewise
the plural shall be understood to include the singular. Words denoting sex shall
be construed to include the masculine, feminine, and neuter, when such
construction is appropriate, and specific enumeration shall not exclude the
general, but shall be construed as cumulative.

                                       36
<PAGE>

     8.14 AGREEMENT SUPERSEDES ALL PRIOR AGREEMENTS. THIS AGREEMENT, TOGETHER
WITH THE NOTE, THE SECURITY INSTRUMENTS, AND ALL OTHER INSTRUMENTS EXECUTED
PURSUANT HERETO, REPRESENT, COLLECTIVELY, THE FINAL AGREEMENT BETWEEN THE
PARTIES HERETO WITH RESPECT TO THE SUBJECT MATTER HEREOF AND MAY NOT BE
CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL
AGREEMENTS OF THE PARTIES AND SHALL SUPERSEDE ANY PRIOR AGREEMENT BETWEEN THE
PARTIES HERETO, WHETHER WRITTEN OR ORAL, RELATING TO THE SUBJECT MATTER HEREOF.
THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.

     8.15 Hedging Transactions. Borrower agrees that promptly upon Bank's
request at or after the execution of this Agreement, Borrower shall execute and
deliver to Bank the ISDA Master Agreement. The existence of the ISDA Master
Agreement or any other master agreement between Borrower and Bank relating to
Hedging Transactions shall not obligate Bank or Borrower to enter into any
particular Hedging Transaction. Borrower agrees that each request by Borrower to
enter into a Hedging Transaction to be governed by any such master agreement
between Borrower and Bank shall be underwritten separately by Bank according to
its then-existing criteria for Hedging Transactions, and each request by
Borrower to enter into a Hedging Transaction shall be subject to separate
approval by Bank. If the Obligations are paid in full and this Agreement is
terminated, the Bank shall execute and deliver or cause to be executed and
delivered such instruments of satisfaction and reassignment prepared at the
expense of Borrower as may be appropriate in order to release all Liens and
security interests created by the Security Instruments, provided, however, that
in lieu of paying off any such Obligations arising under any Hedging Transaction
with the Bank, the Borrower may provide substitute credit support acceptable to
Bank in the form of a letter of credit or cash or cash equivalents in any amount
equal to 110% of the then current exposure under such Hedging Transaction.

     8.16 Controlling Provision Upon Conflict. In the event of a conflict
between the provisions of this Agreement and those of the Note, the Security
Instruments or any other instrument referred to herein or executed in connection
with the Note, the provisions of this Agreement shall control.

     8.17 Time, Place and Method of Payments. All payments required pursuant to
this Agreement or the Note shall be made in immediately available funds; shall
be deemed received by Bank on the next Business Day following receipt if such
receipt is after 3:00 p.m., on any Business Day, and shall be made at the
principal banking quarters of Bank as specified in the Note.

     8.18 Counterpart Execution. This Agreement may be executed as one
instrument signed by all parties or in separate counterparts hereof, each of
which counterparts shall be considered an original and all of which shall be
deemed to be one instrument, and any signed counterpart shall be deemed
delivered by and binding upon the party signing it if either the original signed
counterpart is delivered to any other party hereto or if a copy thereof is sent
to any other party hereto by electronic facsimile transmission.

                                       37
<PAGE>

     8.19 Continuing Security. This Agreement and the Note amend and restate, in
their entirety, the Equiva Credit Agreement and the Equiva Note, respectively,
provided that the Security Instruments, as defined in the Equiva Credit
Agreement, shall continue to secure the Obligations hereunder, as such Security
Documents and all rights thereunder are assigned by Equiva to Bank pursuant to
the Assignment of Note, Liens and Security Interests.

                            [Signature page follows]

<PAGE>

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

                                           BORROWER:
                                           ---------

                                           WHITTIER OPERATING, INC.,
                                           a Texas corporation

                                           By:
                                           -------------------------------------
                                           Bryce W. Rhodes
                                           Vice President

                                           WHITTIER ENERGY COMPANY,
                                           a Nevada corporation

                                           By:
                                           -------------------------------------
                                           Bryce W. Rhodes
                                           Vice President

                                           BANK:
                                           -----

                                           COMPASS BANK

                                           By:
                                           -------------------------------------
                                           Kathleen J. Bowen
                                           Vice President

                                       39
<PAGE>

                                Schedule 1.01(a)
                                ----------------

                            Borrowing Base Properties
                            -------------------------

This Schedule 1.01(a) sets forth the description of the Borrowing Base
Properties covered by the Agreement to which this Schedule 1.01(a) is attached.
All of the terms defined in the Agreement are used in this Schedule 1.01(a) with
the same meanings given therein.

The Borrowing Base Properties include:

     (a) All of Borrower's right, title and interest in and to the oil, gas and
mineral leases described herein and/or lands described in and subject to such
oil, gas and mineral leases (regardless, as to such leases and/or lands, of any
surface acreage and/or depth limitations set forth in any description of any of
such oil, gas and mineral leases), and all of Borrower's right, title and
interest in and to any of the oil, gas and minerals in, on or under the lands,
if any, described on this Schedule 1.01(a), including, without limitation, all
contractual rights, fee interests, leasehold interests, overriding royalty
interests, non-participating royalty interests, mineral interests, production
payments, net profits interests, or any other interest measured by or payable
out of production of oil, gas or other minerals from the oil, gas and mineral
leases and/or lands described herein; and

     (b) All of the foregoing interests of Borrower as such interests may be
enlarged by the discharge of any payments out of production or by the removal of
any charges or encumbrances together with Borrower's interests in, to and under
or derived from all renewals and extensions of any oil, gas and mineral leases
described herein, it being specifically intended hereby that any new oil and gas
lease (i) in which an interest is acquired by Borrower after the termination or
expiration of any oil and gas lease, the interests of Borrower in, to and under
or derived from which are subject to the lien and security interest hereof, and
(ii) that covers all or any part of the property described in and covered by
such terminated or expired leases, shall, to the extent, and only to the extent
such new oil and gas lease may cover such property, be considered a renewal or
extension of such terminated or expired lease; and

     (c) All right, title and interest of Borrower in, to and under or derived
from any operating, farmout, and bidding agreements, assignments and subleases,
whether or not described in this Schedule 1.01(a), to the extent, and only to
the extent, that such agreements, assignments and subleases (i) cover or include
any of Borrower's present right, title and interest in and to the leases and/or
lands described in this Schedule 1.01(a), or (ii) cover or include any other
undivided interests now or hereafter held by Borrower in, to and under the
described leases and/or lands, including, without limitation, any future
operating, farmout and bidding agreements, assignments, subleases and pooling,
unitization and communitization agreements and the units created thereby
(including, without limitation all units formed under orders, regulations, rules
or other official acts of any governmental body or agency having jurisdiction)
to the extent and only to the extent that such agreements, assignments,
subleases, or units cover or include the described leases and/or lands; and

<PAGE>

     (d) All right, title, and interest of Borrower in, to and under or derived
from all presently existing and future advance payment agreements, oil,
casinghead gas and gas sales, exchange, and processing contracts and agreements
including, without limitation, those contracts and agreements that are described
on this Schedule 1.01(a) to the extent, and only to the extent, those contracts
and agreements cover or include the described leases and/or lands herein; and

     (e) All right, title and interest of Borrower in, to and under or derived
from all existing and future permits, licenses, easements and similar rights and
privileges that relate to or are appurtenant to any of the described leases
and/or lands.

     Notwithstanding the intention of this Agreement to cover all of the right,
title and interest of Borrower in and to the described leases and/or lands,
Borrower hereby specifically warrants and represents that the interests covered
by this Schedule 1.01(a) are not greater than the working interest nor less than
the net revenue interest, overriding royalty interest, net profit interest,
production payment interest or other interest payable out of or measured by
production set forth in connection with each oil and gas well described in this
Schedule 1.01(a). In the event Borrower owns any other or greater interest, such
additional interest shall also be covered by and included in this Agreement. The
designation "Working Interest" or "W.I." means an interest owned in an oil, gas,
and mineral lease that determines the cost bearing percentage of the owner of
such interest. The designation "Net Revenue Interest" or "NRI" means net revenue
interest, or that portion of the production attributable to the owner of a
working interest after deduction for all royalty burdens, overriding royalty
burdens, or other burdens on production, except severance, production, windfall
profits and other similar taxes. The designation "Overriding Royalty Interest"
or "ORRI" means an interest in production which is free of any obligation for
the expense of exploration, development and production, bearing only its pro
rata share of severance, production, windfall profits and other similar taxes.

<PAGE>

                              PROPERTY DESCRIPTION

                                  Subject Wells
                                  -------------

                                 Subject Leases
                                 --------------

                                    PART TWO

                                  Subject Wells
                                  -------------

                                 Subject Leases
                                 --------------

<PAGE>

                                  Schedule 4.09
                                  -------------

                            Purchasers of Production
                            ------------------------

<PAGE>

                                  Schedule 4.11
                                  -------------

                                   Litigation
                                   ----------

<PAGE>

                                  Schedule 4.20
                                  -------------

                              Existing Indebtedness
                              ---------------------

1.   Equiva Credit Agreement and Equiva Note

<PAGE>

                                  Schedule 4.23
                                  -------------

                           Existing Hedge Transactions
                           ---------------------------

                              [See following pages]

<PAGE>

                                  Schedule 5.01
                                  -------------

                                  Use of Funds
                                  ------------

The funds advanced by Bank pursuant to this Agreement shall be advanced by Bank
to Equiva for Bank's acquisition of the Existing Indebtedness described on
Schedule 4.20 hereof owed by Borrower to Equiva pursuant to the Assignment of
Note, Liens and Security Interests and the remainder of funds shall be advanced
to Borrower solely for acquiring Oil and Gas Properties with Proved Reserves,
conducting developmental drilling and for other general corporate purposes.

<PAGE>

                                  Schedule 6.01
                                  -------------

                                   Investments
                                   -----------

<PAGE>

                                  Schedule 6.09
                                  -------------

            Whittier Family Group and Ownership Interest in Borrower
            --------------------------------------------------------

<PAGE>

                                   EXHIBIT "A"

                             REDUCING REVOLVING NOTE
                             -----------------------

$15,000,000.00                    Houston, Texas                   July 17, 2002

     On the dates hereinafter prescribed, for value received, WHITTIER ENERGY
COMPANY, a Nevada corporation, and WHITTIER OPERATING, INC., a Texas corporation
(collectively, "Borrower"), having an address at 7770 El Camino Real, Carlsbad,
California 92009, promises to pay to the order of COMPASS BANK (herein called
"Bank"), at its principal offices at 24 Greenway Plaza, Suite 1400A, Houston,
Harris County, Texas 77046, (i) the principal amount of FIFTEEN MILLION AND
NO/100 DOLLARS ($15,000,000.00) or the principal amount advanced pursuant to the
terms of the Credit Agreement (defined herein) as of the date of maturity
hereof, whether by acceleration or otherwise, whichever may be the lesser, and
(ii) interest on the principal balance from time to time advanced and remaining
unpaid from the date of the advance until the "Maturity Date" at a rate of
interest equal to the lesser of (a) the "Floating Rate," calculated on the basis
of a year of 365 or 366 days, as the case may be, and for the actual number of
days elapsed (including the first day but excluding the last day), or (b) the
"Maximum Rate." Any increase or decrease in interest rate resulting from a
change in the Maximum Rate shall be effective immediately when such change
becomes effective, without notice to Borrower, unless "Applicable Law" requires
that such increase or decrease not be effective until a later time, in which
event such increase or decrease shall be effective at the earliest time
permitted under the provisions of such law.

     All capitalized terms used herein, which are not defined herein, including,
but not limited to, the terms Applicable Law, Floating Rate, Maturity Date,
Maximum Rate and Security Instruments shall be defined as set forth in the
Credit Agreement between Borrower and Bank dated of even date with this Note
(the "Credit Agreement").

     This Note is issued pursuant to the Credit Agreement. Reference is hereby
made to the Credit Agreement for a statement of the rights and obligations of
the holder of this Note and the duties and obligations of Borrower in relation
thereto; but neither this reference to the Credit Agreement nor any provisions
thereof shall affect or impair the absolute and unconditional obligation of
Borrower to pay any outstanding and unpaid principal of and interest on this
Note when due, in accordance with the terms of the Credit Agreement. Each
advance and each payment made pursuant to this Note shall be reflected by
notations made by Bank on its records and the aggregate unpaid amounts of
principal and interest reflected by the notations on the records of Bank shall
be deemed rebuttably presumptive evidence of the principal amount owing under
this Note.

<PAGE>

     This Note is a revolving credit note and it is contemplated that by reason
of prepayments hereon there may be times when no indebtedness is owing
hereunder; but notwithstanding such occurrence, this Note shall remain valid and
in full force and effect as to each principal advance made hereunder subsequent
to each such occurrence.

     This Note is secured by all security agreements, collateral assignments,
mortgages and lien instruments executed by Borrower (or by any other party) in
favor of Bank or its predecessors, including the Security Instruments executed
simultaneously herewith, those executed heretofore and those hereafter executed.

     Except as may be expressly provided in the Credit Agreement, Borrower and
all sureties, endorsers and guarantors of this Note waive demand, presentment
for payment, notice of nonpayment, protest, notice of protest, notice of intent
to accelerate maturity, notice of acceleration of maturity, and all other
notices, filing of suit and diligence in collecting this Note or enforcing any
of the security herefor, and agree to any substitution, exchange or release of
any such security or the release of any party primarily or secondarily liable
hereon and further agree that it will not be necessary for Bank, in order to
enforce payment of this Note by them, to first institute suit or exhaust its
remedies against any Borrower or others liable herefor, or to enforce its rights
against any security herefor, and consent to any one or more extensions or
postponements of time of payment of this Note on any terms or any other
indulgences with respect hereto, without notice thereof to any of them. Bank may
transfer this Note, and the rights and privileges of Bank under this Note shall
inure to the benefit of Bank's representatives, successors or assigns.

     Executed this 17th day of July 2002.

                                         WHITTIER OPERATING, INC.,
                                         a Texas corporation

                                         By:
                                         ---------------------------------------
                                         Bryce W. Rhodes
                                         Vice President

                                         WHITTIER ENERGY COMPANY,
                                         a Nevada corporation

                                         By:
                                         ---------------------------------------
                                         Bryce W. Rhodes
                                         Vice President

<PAGE>

                                   EXHIBIT "B"

                              SECURITY INSTRUMENTS
                              --------------------

     The Security Instruments securing the obligations of Borrower and
Indebtedness to Bank shall include the following, each in form and substance
satisfactory to Bank:

1.   DEED OF TRUST, MORTGAGE, SECURITY AGREEMENT, FINANCING STATEMENT AND
     ASSIGNMENT OF PRODUCTION, (and such other similarly titled mortgaged
     instruments) covering each Borrower's interest in the Borrowing Base
     Properties, the personal property and equipment therein and thereon, the
     production of oil, gas, and other minerals therefrom, and all of the
     products and proceeds thereof.

2.   AMENDED AND RESTATED ACT OF MORTGAGE, SECURITY AGREEMENT, FINANCING
     STATEMENT AND ASSIGNMENT OF PRODUCTION, covering each Borrower's interest
     in the Borrowing Base Properties, the personal property and equipment
     therein and thereon, the production of oil, gas, and other minerals
     therefrom, and all of the products and proceeds thereof.

3.   SECURITY AGREEMENT granting Bank a first priority security interest in all
     of each Borrower's accounts, escrow accounts, equipment, machinery,
     fixtures, inventory, chattel paper, documents, contracts (including Hedging
     Transactions), instruments and general intangibles relating to or arising
     out of the Borrowing Base Properties, and in all collateral supporting
     bonds for plugging and abandonment of wells and Oil and Gas Properties
     included in the Borrowing Base Properties, whether now owned or hereafter
     acquired, and all products and proceeds thereof.

4.   FINANCING STATEMENTS in connection with the Security Instruments described
     in the preceding paragraphs, in form and number satisfactory to Bank as
     Bank, from to time, may specify (including additional or supplemental
     financing statements, amendments thereto, and continuation statements
     thereof).

5.   LETTERS IN LIEU OF TRANSFER ORDERS covering Borrower's interest in oil and
     gas produced from the Borrowing Base Properties and in the proceeds from
     the sale thereof, pursuant to the assignment of production included in the
     Deed of Trust referenced above.

                                      B-1
<PAGE>

6.   OTHER SECURITY INSTRUMENTS. Such other instruments as are necessary or
     appropriate from time to time, in the good faith opinion of Bank, to
     perfect to the satisfaction of Bank's liens, security interests, and other
     rights in the Borrowing Base Properties and in any and all other collateral
     covered by or described in (or, as evidenced by the Agreement, intended to
     have been covered by) any of the other Security Instruments described
     above.

POWER OF ATTORNEY. To the fullest extent permitted by Law, Borrower hereby
appoints Bank as its attorney-in-fact (without requiring Bank to act as such) to
execute any Security Instrument in the name of Borrower, and to perform all
other acts that Bank deems appropriate to perfect and continue its liens,
security interests, and other rights in, and to protect and preserve, the
Borrowing Base Properties and other collateral covered by or described in (or,
as evidenced by the Agreement, intended to have been covered by) any of the
Security Instruments described above, but only to the extent required of
Borrower under the terms of this Agreement. This power of attorney is coupled
with an interest and shall be irrevocable until the full and final payment and
performance of all of Borrower's Indebtedness and Obligations to Bank.

                                      B-2
<PAGE>

                                   EXHIBIT "C"

                               REQUEST FOR ADVANCE
                               -------------------

     I, the undersigned officer of WHITTIER ENERGY COMPANY and WHITTIER
OPERATING, INC. (collectively, the "Borrower"), pursuant to Section 2.01 of the
Credit Agreement (the "Agreement") dated as of July 17, 2002, as amended from
time to time, by and between COMPASS BANK (the "Bank") and the Borrower, do
hereby:

     1.   request an advance under the Agreement in the amount of
          $______________ to be made on ______________, 200 ;

     2.   certify that the funds advanced from Bank to Borrower pursuant to
          paragraph 1 hereof shall be used by Borrower solely for the purposes
          permitted by the Agreement; and

     3.   further certify that to my knowledge after reasonable inquiry into the
          applicable facts, as of the date hereof, Borrower is in compliance in
          all material respects with all of the representations, warranties,
          terms, conditions and covenants contained in the Agreement.

     This certificate is executed this ___________ day of ___________ , 200__.

                                           WHITTIER OPERATING, INC.,
                                           a Texas corporation

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

                                           WHITTIER ENERGY COMPANY,
                                           a Nevada corporation

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

<PAGE>

                                   EXHIBIT "D"

                             COMPLIANCE CERTIFICATE
                             ----------------------EXHIBIT 4.4

                                 FIRST AMENDMENT
                                       to
                                CREDIT AGREEMENT

                                  by and among

                WHITTIER ENERGY COMPANY, WHITTIER OPERATING, INC.
                                       and
                                  COMPASS BANK

     This First Amendment ("First Amendment") to that certain Credit Agreement
dated July 17, 2002 by and among WHITTIER ENERGY COMPANY, a Nevada corporation
("Whittier Energy"), and WHITTIER OPERATING, INC., a Texas corporation
("Whittier Operating") (collectively, the "Borrower") and COMPASS BANK, an
Alabama state chartered bank (the "Bank"), is entered into on this 10th day of
March 2003.

                              W I T N E S S E T H:

     Whereas, Borrower and Bank entered into that certain Credit Agreement dated
July 17, 2002 (the "Credit Agreement").

     Whereas, Borrower has requested that Bank amend the Credit Agreement and
Bank has agreed to such amendments subject to the terms and conditions hereof.

     NOW, THEREFORE, in consideration of the mutual promises herein contained,
and for other good and valuable consideration, the receipt and sufficiency of
which are acknowledged by Borrower and Bank, and each intending to be legally
bound hereby, the parties agree as follows:

     I. Specific Amendments to Credit Agreement.

     Article I of the Credit Agreement is hereby amended by adding the following
definitions thereto:

          "Eagle Letter Agreement" means that certain Letter Agreement between
     Eagle Energy Development Company, a Texas corporation, and Whittier
     Operating dated February 13, 2003, which evidences, among other things,
     Eagle Energy Development Company's agreement to assign the Borrowing Base
     Properties, described on Supplemental. Schedule 1.01(a) attached to the
     First Amendment, to Whittier Operating.

          "First Amendment" means the First Amendment to this Agreement executed
     by Borrower and Bank on March 10, 2003.

          "Newfield Purchase and Sale Agreement" means that certain Purchase and
     Sale Agreement by and between Newfield Exploration Company, as Seller, and
     Eagle Energy Development Company, as Buyer, dated effective September 1,
     2002.

<PAGE>

     Article I of the Credit Agreement is hereby further amended by revising the
following definition in its entirety to read as follows:

          "Borrowing Base Properties" means those Oil and Gas Properties of
     Borrower that will, with execution of the Loan Documents, be subject to
     liens created by certain of the Security Instruments to secure the
     Obligations, which initial Borrowing Base Properties are described in
     Schedule 1.01(a) attached hereto and made a part hereof, as amended or
     supplemented from time to time, and such Borrowing Base Properties to
     include those Oil and Gas Properties described in Part Two of such Schedule
     1.01(a) upon the satisfaction of the conditions precedent under Section
     3.17 hereof.

     The following sections of the Credit Agreement are hereby amended by
replacing the term "Whittier Energy" each time it appears therein with the term
"Borrower":

        Section 3.13;
        Section 3.16;
        Section 4.04;
        Section 4.06; and
        Section 4.09.

     Schedule 1.01(a) to the Credit Agreement is hereby amended by adding
thereto the Borrowing Base Properties described on Supplemental Schedule 1.01(a)
attached hereto.

     Schedule 4.09 to the Credit Agreement is hereby amended by adding thereto
the purchasers of production listed on Supplemental Schedule 4.09 attached
hereto.

     Schedule 4.11 to the Credit Agreement is hereby amended by adding thereto
those certain litigation matters listed on Supplemental Schedule 4.11 attached
hereto.

     II. Conditions Precedent in Connection with the First Amendment. The
obligation of Bank to enter into the First Amendment is subject to satisfaction
of the following conditions precedent:

          (a) Receipt of First Amendment and Compliance Certificate. Bank shall
     have received multiple counterparts of the First Amendment, as requested by
     Bank, and the Compliance Certificate duly executed by an authorized officer
     for each Borrower.

          (b) Accuracy of Representations and Warranties and No Event of
     Default. The representations and warranties contained in Article IV of the
     Credit Agreement shall be true and correct in all material respects on the
     date of the First Amendment with the same effect as though such
     representations and warranties had been made on such date; and no Event of
     Default shall have occurred and be continuing.

          (c) Legal Matters Satisfactory to Special Counsel to Bank. All legal
     matters incident to the consummation of the transactions contemplated by
     the First Amendment shall be satisfactory to the firm of Porter & Hedges,
     L.L.P., special counsel for Bank.

                                       2
<PAGE>

          (d) No Material Adverse Change. No material adverse change shall have
     occurred since the date of the Credit Agreement in the condition, financial
     or otherwise, of Borrower.

          (e) Acquisition Agreements. Bank shall be satisfied in its sole
     discretion that the transactions evidenced by the Newfield Purchase and
     Sale Agreement and the Eagle Letter Agreement have been irrevocably closed
     and Whittier Operating has been assigned the interests in those certain
     Borrowing Base Properties described on Supplemental Schedule 1.01(a)
     attached to this First Amendment.

     III. Reaffirmation of Representations and Warranties. To induce Bank to
enter into this First Amendment, Borrower hereby reaffirms, as of the date
hereof, its representations and warranties contained in Article IV of the Credit
Agreement and in all other documents executed pursuant thereto, and additionally
represents and warrants as follows:

          A. The execution and delivery of this First Amendment and the
     performance by Borrower of its obligations under this First Amendment are
     within Borrower's Corporate Power, have been duly authorized by all
     necessary Corporate Action, have received all necessary governmental
     approval (if any shall be required), and do not and will not contravene or
     conflict with any provision of law or of the Governing Documentation of
     Borrower or of any agreement binding upon Borrower.

          B. The Credit Agreement as amended by this First Amendment, represents
     the legal, valid and binding obligations of Borrower, enforceable against
     Borrower in accordance with its terms, subject as to enforcement only to
     bankruptcy, insolvency, reorganization, moratorium or other similar laws
     affecting the enforcement of creditors' rights generally.

          C. No Event of Default or Unmatured Event of Default has occurred and
     is continuing as of the date hereof.

     IV. Defined Terms. Except as amended hereby, terms used herein that are
defined in the Credit Agreement shall have the same meanings in this First
Amendment.

     V. Reaffirmation of Credit Agreement. This First Amendment shall be deemed
to be an amendment to the Credit Agreement, and the Credit Agreement, as hereby
amended, is hereby ratified, approved and confirmed in each and every respect.
All references to the Credit Agreement herein and in any other document,
instrument, agreement or writing shall hereafter be deemed to refer to the
Credit Agreement as amended hereby.

     VI. Entire Agreement. The Credit Agreement, as hereby amended, embodies the
entire agreement between Borrower and Bank and supersedes all prior proposals,
agreements and understandings relating to the subject matter hereof. Borrower
certifies that it is relying on no representation, warranty, covenant or
agreement except for those set forth in the Credit Agreement as hereby amended
and the other documents previously executed or executed of even date herewith.

                                       3
<PAGE>

     VII. Governing Law. THIS FIRST AMENDMENT SHALL BE GOVERNED BY AND CONSTRUED
IN ACCORDANCE WITH THE LAWS OF THE STATE OF TEXAS AND THE APPLICABLE LAWS OF THE
UNITED STATES OF AMERICA. This First Amendment has been entered into in Harris
County, Texas, and it shall be performable for all purposes in Harris County,
Texas. Courts within the State of Texas shall have jurisdiction over any and all
disputes between Borrower and Bank, whether in law or equity, including, but not
limited to, any and all disputes arising out of or relating to this First
Amendment or any other Loan Document; and venue in any such dispute whether in
federal or state court shall be laid in Harris County, Texas.

     VIII. Severability. Whenever possible each provision of this First
Amendment shall be interpreted in such manner as to be effective and valid under
applicable law, but if any provision of this First Amendment shall be prohibited
by or invalid under applicable law, such provision shall be ineffective to the
extent of such prohibition or invalidity, without invalidating the remainder of
such provision or the remaining provisions of this First Amendment.

     IX. Execution in Counterparts. Each party hereto acknowledges that this
Agreement may be executed in several counterparts by each party at different
times and in different locations; that each separate counterpart bearing the
signature of any party may be effectively delivered to the other parties by the
delivery of an electronic facsimile sent via telecopier; that each party so
delivering any such counterpart shall be bound by its facsimile signature
thereon; and that the signature pages from counterparts signed by each party may
be collated into one or more copies of this agreement, which shall constitute
one and the same agreement among all parties hereto.

     X. Section Captions. Section captions used in this First Amendment are for
convenience of reference only, and shall not affect the construction of this
First Amendment.

     XI. Successors and Assigns. This First Amendment shall be binding upon
Borrower and Bank and their respective successors and assigns, and shall inure
to the benefit of Borrower and Bank, and the respective successors and assigns
of Bank.

     XII. Non-Application of Chapter 346 of Texas Finance Codes. In no event
shall Chapter 346 of the Texas Finance Code (which regulates certain revolving
loan accounts and revolving tri-party accounts) apply to this Credit Agreement
as hereby amended or any other Loan Document or the transactions contemplated
hereby.

     XIII. Notice. THIS FIRST AMENDMENT TOGETHER WITH THE CREDIT AGREEMENT, AND
THE OTHER LOAN DOCUMENTS REPRESENT THE FINAL AGREEMENT BETWEEN THE PARTIES AND
MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT ORAL
AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE
PARTIES.

                                       4
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this First Amendment to
be effective as of the day and year above written.

                                            BORROWER:
                                            ---------

                                            WHITTIER OPERATING, INC.,
                                            a Texas corporation

                                            By:________________________________
                                            Bryce W. Rhodes
                                            Vice President

                                            WHITTIER ENERGY COMPANY,
                                            A Nevada corporation

                                            By:________________________________
                                            Bryce W. Rhodes
                                            Vice President

                                            BANK:
                                            -----

                                            COMPASS BANK

                                            By:________________________________
                                            Kathleen J. Bowen
                                            Vice President

                                        5
<PAGE>

                          Supplemental Schedule 1.01(a)
                          -----------------------------

                            Borrowing Base Properties
                            -------------------------

                             [See pages to follow.]
            [Any reference to Exhibit A shall be deemed to reference
                         Supplemental Schedule 1.01(a).]

<PAGE>

                           Supplemental Schedule 4.09
                           --------------------------

                            Purchasers of Production
                            ------------------------

ConocoPhillips
600 North Dairy Ashford
Houston, Texas 77079-1175

<PAGE>

                           Supplemental Schedule 4.11
                           --------------------------

                                   Litigation
                                   ----------

1. Keith Vienne, et al. v. Conoco, Inc., et al., No. 74,427, 15th Judicial
District Court, Parish of Acadia, State of Louisiana.

2. Larry Mouton, et al. v. Conoco, Inc., et al., No. 75,038, 15th Judicial
District Court, Parish of Acadia, State of Louisiana.

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