Document:

<PAGE>

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

                     AMENDED AND RESTATED CREDIT AGREEMENT
                          [Revolving Credit Facility]
            _______________________________________________________

                    PLAINS MARKETING, L.P., as US Borrower,
    ALL AMERICAN PIPELINE, L.P. and PLAINS ALL AMERICAN PIPELINE, L.P., as
                                  Guarantors,

                 FLEET NATIONAL BANK, as Administrative Agent,
          FLEET SECURITIES, INC., as Lead Arranger and Book Manager,

               FIRST UNION NATIONAL BANK, as Syndication Agent,
                BANK OF AMERICA, N.A., as Documentation Agent,
         BANK ONE, NA (MAIN OFFICE CHICAGO) and FORTIS CAPITAL CORP.,
                          as Senior Managing Agents,

               and CERTAIN FINANCIAL INSTITUTIONS, as US Lenders

                    $500,000,000 Revolving Credit Facility
               ________________________________________________

                 PMC (NOVA SCOTIA) COMPANY, as Term Borrower,
    ALL AMERICAN PIPELINE, L.P. and PLAINS ALL AMERICAN PIPELINE, L.P., as
                                  Guarantors,

                 FLEET NATIONAL BANK, as Administrative Agent,
          FLEET SECURITIES, INC., as Lead Arranger and Book Manager,

              and CERTAIN FINANCIAL INSTITUTIONS, as Term Lenders

                            $100,000,000 Term Loan
               ________________________________________________

         PLAINS MARKETING CANADA, L.P., as Canadian Revolver Borrower,
    ALL AMERICAN PIPELINE, L.P. and PLAINS ALL AMERICAN PIPELINE, L.P., as
                                  Guarantors,

                 FLEET NATIONAL BANK, as Administrative Agent,
          FLEET SECURITIES, INC., as Lead Arranger and Book Manager,

         THE TORONTO-DOMINION BANK, as Canadian Administration Agent,

       and CERTAIN FINANCIAL INSTITUTIONS, as Canadian Revolver Lenders

                $30,000,000 Canadian Revolving Credit Facility
            _______________________________________________________

                                  May 4, 2001

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

                               TABLE OF CONTENTS

<TABLE>
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                                                                                                     Page
                                                                                                     ----
<S>                                                                                                  <C>
ARTICLE I - Definitions and References...............................................................   1
     Section 1.1.  Defined Terms.....................................................................   1
     Section 1.2.  Exhibits and Schedules; Additional Definitions....................................  29
     Section 1.3.  Amendment of Defined Instruments..................................................  29
     Section 1.4.  References and Titles.............................................................  30
     Section 1.5.  Calculations and Determinations...................................................  30

ARTICLE IIA - The US Loans...........................................................................  30
     Section 2A.1.  Commitments to Lend; US Notes....................................................  30
     Section 2A.2.  Requests for US Loans............................................................  31
     Section 2A.3.  Continuations and Conversions of Existing US Loans...............................  32
     Section 2A.4.  Use of Proceeds..................................................................  33
     Section 2A.5.  Interest Rates and Fees..........................................................  34
     Section 2A.6.  Optional Prepayments.............................................................  34
     Section 2A.7.  Mandatory Prepayments............................................................  35
     Section 2A.8.  US Letters of Credit.............................................................  36
     Section 2A.9.  Requesting US Letters of Credit..................................................  36
     Section 2A.10. Reimbursement and Participations.................................................  37
     Section 2A.11. US Letter of Credit Fees.........................................................  38
     Section 2A.12. No Duty to Inquire...............................................................  38
     Section 2A.13. US LC Collateral.................................................................  39
     Section 2A.14. Hedging Contracts................................................................  41

ARTICLE IIB - The Canadian Revolver Advances and Canadian Letters of Credit..........................  41
     Section 2B.1.  Canadian Revolver Advances.......................................................  41
     Section 2B.2.  Requests for New Canadian Revolver Advances......................................  42
     Section 2B.3.  Continuations and Conversions of Existing Canadian Revolver Advances.............  43
     Section 2B.4.  Repayments of....................................................................  44
     Section 2B.5.  Interest Rates and Fees..........................................................  45
     Section 2B.6.  Use of Proceeds..................................................................  46
     Section 2B.7.  Creation of Bankers' Acceptances.................................................  46
     Section 2B.8.  Terms of Acceptance by the Canadian Revolver Lenders.............................  47
     Section 2B.9.  General Procedures for Bankers' Acceptances......................................  49
     Section 2B.10. Execution of Bankers' Acceptances................................................  50
     Section 2B.11. Escrowed Funds...................................................................  50
     Section 2B.12. Canadian Letters of Credit.......................................................  50
     Section 2B.13. Requesting Canadian Letters of Credit............................................  51
     Section 2B.14. Reimbursement and Participations.................................................  52
     Section 2B.15. Canadian Letter of Credit Fees...................................................  53
     Section 2B.16. No Duty to Inquire...............................................................  54
     Section 2B.17. Canadian LC Collateral...........................................................  55
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<TABLE>
<S>                                                                                                    <C>
     Section 2B.18.  Hedging Contracts...............................................................  56

ARTICLE IIC - Term Loans.............................................................................  56
     Section 2C.1. Term Loans........................................................................  56
     Section 2C.2. Continuations and Conversions of Existing Term Loans..............................  57
     Section 2C.3. Repayments........................................................................  58
     Section 2C.4. Use of Proceeds...................................................................  59
     Section 2C.5. Hedging Contracts.................................................................  59

ARTICLE III - Payments to Lenders....................................................................  59
     Section 3.1.  General Procedures................................................................  59
     Section 3.2.  Capital Reimbursement.............................................................  62
     Section 3.3.  Increased Cost of LIBOR Loans or Letters of Credit................................  62
     Section 3.4.  Notice; Change of Applicable Lending Office.......................................  63
     Section 3.5.  Availability......................................................................  63
     Section 3.6.  Funding Losses....................................................................  64
     Section 3.7.  Reimbursable Taxes................................................................  64
     Section 3.8.  Replacement of Lenders............................................................  66

ARTICLE IV - Conditions Precedent to Lending.........................................................  68
     Section 4.1.  Documents to be Delivered.........................................................  68
     Section 4.2.  Additional Conditions Precedent...................................................  70

ARTICLE V - Representations and Warranties...........................................................  71
     Section 5.1.  No Default........................................................................  71
     Section 5.2.  Organization and Good Standing....................................................  71
     Section 5.3.  Authorization.....................................................................  71
     Section 5.4.  No Conflicts or Consents..........................................................  72
     Section 5.5.  Enforceable Obligations...........................................................  72
     Section 5.6.  Initial Financial Statements......................................................  72
     Section 5.7.  Other Obligations and Restrictions................................................  73
     Section 5.8.  Full Disclosure...................................................................  73
     Section 5.9.  Litigation........................................................................  73
     Section 5.10.  Labor Disputes and Acts of God...................................................  73
     Section 5.11.  ERISA Plans and Liabilities......................................................  73
     Section 5.12.  Compliance with Laws.............................................................  74
     Section 5.13.  Environmental Laws...............................................................  74
     Section 5.14.  Names and Places of Business.....................................................  76
     Section 5.15.  Borrower's Subsidiaries..........................................................  76
     Section 5.16.  Title to Properties; Licenses....................................................  77
     Section 5.17.  Government Regulation............................................................  77
     Section 5.18.  Insider..........................................................................  77
     Section 5.19.  Solvency.........................................................................  77
     Section 5.20.  Credit Arrangements..............................................................  78
</TABLE>

                                      ii
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<TABLE>
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ARTICLE VI - Affirmative Covenants...................................................................  78
     Section 6.1.  Payment and Performance...........................................................  78
     Section 6.2.  Books, Financial Statements and Reports...........................................  78
     Section 6.3.  Other Information and Inspections.................................................  81
     Section 6.4.  Notice of Material Events and Change of Address...................................  81
     Section 6.5.  Maintenance of Properties.........................................................  82
     Section 6.6.  Maintenance of Existence and Qualifications.......................................  82
     Section 6.7.  Payment of Trade Liabilities, Taxes, etc..........................................  82
     Section 6.8.  Insurance.........................................................................  83
     Section 6.9.  Performance on Borrower's Behalf..................................................  83
     Section 6.10. Interest..........................................................................  83
     Section 6.11. Compliance with Agreements and Law................................................  83
     Section 6.12. Environmental Matters; Environmental Reviews......................................  84
     Section 6.13. Evidence of Compliance............................................................  84
     Section 6.14. Agreement to Deliver Security Documents...........................................  84
     Section 6.15. Perfection and Protection of Security Interests and Liens.........................  84
     Section 6.16. Bank Accounts; Offset.............................................................  85
     Section 6.17. Guaranties of Subsidiaries........................................................  85
     Section 6.18. Compliance with Agreements........................................................  85
     Section 6.19. Rents.............................................................................  86
     Section 6.20. Working Capital Borrowings........................................................  86
     Section 6.21. Canadian Revolver Advances........................................................  86

ARTICLE VII - Negative Covenants.....................................................................  86
     Section 7.1.  Indebtedness......................................................................  87
     Section 7.2.  Limitation on Liens...............................................................  88
     Section 7.3.  Hedging Contracts.................................................................  90
     Section 7.4.  Limitation on Mergers, Issuances of Securities....................................  90
     Section 7.5.  Limitation on Sales of Property...................................................  91
     Section 7.6.  Limitation on Dividends and Redemptions...........................................  92
     Section 7.7.  Limitation on Investments and New Businesses......................................  92
     Section 7.8.  Limitation on Credit Extensions...................................................  93
     Section 7.9.  Transactions with Affiliates......................................................  93
     Section 7.10. Prohibited Contracts..............................................................  93
     Section 7.11. Current Ratio.....................................................................  93
     Section 7.12. Debt Coverage Ratio...............................................................  94
     Section 7.13. Interest Coverage Ratio...........................................................  94
     Section 7.14. Debt to Capital Ratio.............................................................  95
     Section 7.15. Open Position; Certain Permitted Financial Instruments; NYMEX
            Transactions.............................................................................  95
     Section 7.16. 3794865 Canada Ltd................................................................  97

ARTICLE VIII - Events of Default and Remedies........................................................  97
     Section 8.1.  Events of Default.................................................................  97
     Section 8.2.  Remedies.......................................................................... 100
</TABLE>

                                      iii
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<TABLE>
<S>                                                                                                   <C>
ARTICLE IX - Agents.................................................................................. 100
     Section 9.1.  Appointment and Authority......................................................... 100
     Section 9.2.  Exculpation, Administrative Agent's Reliance, Etc................................. 102
     Section 9.3.  Credit Decisions.................................................................. 102
     Section 9.4.  Indemnification................................................................... 102
     Section 9.5.  Rights as Lender.................................................................. 103
     Section 9.6.  Sharing of Set-Offs and Other Payments............................................ 103
     Section 9.7.  Investments....................................................................... 104
     Section 9.8.  Benefit of Article IX............................................................. 104
     Section 9.9.  Resignation....................................................................... 104
     Section 9.10.  Other Agents..................................................................... 105

ARTICLE X - Miscellaneous............................................................................ 106
     Section 10.1.  Waivers and Amendments; Acknowledgments.......................................... 106
     Section 10.2.  Survival of Agreements; Cumulative Nature........................................ 108
     Section 10.3.  Notices.......................................................................... 108
     Section 10.4.  Payment of Expenses; Indemnity................................................... 109
     Section 10.5.  Joint and Several Liability; Parties in Interest; Assignments;
            Replacement Notes........................................................................ 110
     Section 10.6.  Confidentiality.................................................................. 113
     Section 10.7.  Governing Law; Submission to Process............................................. 113
     Section 10.8.  Waiver of Judgment Interest Act (Alberta)........................................ 114
     Section 10.9.  Deemed Reinvestment Not Applicable............................................... 114
     Section 10.10. Limitation on Interest........................................................... 114
     Section 10.11. Termination; Limited Survival.................................................... 116
     Section 10.12. Severability..................................................................... 116
     Section 10.13. Counterparts..................................................................... 116
     Section 10.14. Waiver of Jury Trial, Punitive Damages, etc...................................... 116
     Section 10.15. Amendment and Restatement........................................................ 117
</TABLE>

                                      iv
<PAGE>

Schedules and Exhibits:
----------------------

Schedule 1 - Lender Schedule
Schedule 2 - Disclosure Schedule
Schedule 3 - Security Schedule
Schedule 4 - Insurance Schedule
Schedule 5 - Pricing Grid

Exhibit A-1 - US Note
Exhibit A-2 - Canadian Revolver Note
Exhibit A-3 - Term Note
Exhibit B-1 - US Borrowing Notice
Exhibit B-2 - Canadian Revolver Borrowing Notice
Exhibit C-1 - US Continuation/Conversion Notice
Exhibit C-2 - Canadian Revolver Continuation/Conversion Notice
Exhibit C-3 - Term Continuation/Conversion Notice
Exhibit D -  Certificate Accompanying Financial Statements
Exhibit E-1 - Opinion of In-House Counsel for Restricted Persons
Exhibit E-2 - Opinion of Fulbright & Jaworski L.L.P., Counsel for Restricted
 Persons
Exhibit E-3 - Opinion of Bennett Jones, Canadian Counsel for Restricted Persons
Exhibit F - Environmental Compliance Certificate
Exhibit G-1 - US Letter of Credit Application and Agreement
Exhibit G-2 - Canadian Letter of Credit Application and Agreement
Exhibit H - Assignment and Acceptance Agreement
Exhibit I - Intercreditor Agreement

                                       v
<PAGE>

                     AMENDED AND RESTATED CREDIT AGREEMENT
                     -------------------------------------

     THIS AMENDED AND RESTATED CREDIT AGREEMENT is made as of May 4, 2001 by and
among PLAINS MARKETING, L.P., a Delaware limited partnership ("US Borrower"),
PMC (NOVA SCOTIA) COMPANY, a Nova Scotia unlimited liability company ("Term
Borrower"), PLAINS MARKETING CANADA, L.P., an Alberta limited partnership
("Canadian Revolver Borrower"), ALL AMERICAN PIPELINE, L.P., a Texas limited
partnership ("All American"), PLAINS ALL AMERICAN PIPELINE, L.P. ("Plains MLP"),
a Delaware limited partnership, FLEET NATIONAL BANK, as administrative agent (in
such capacity, "Administrative Agent"), FIRST UNION NATIONAL BANK, as
syndication agent (in such capacity, "Syndication Agent"), BANK OF AMERICA,
N.A., as documentation agent (in such capacity, "Documentation Agent"), BANK
ONE, NA (MAIN OFFICE CHICAGO) and FORTIS CAPITAL CORP., as Senior Managing
Agents, THE TORONTO-DOMINION BANK, as Canadian administration agent (in such
capacity, "Canadian Administration Agent") and FLEET SECURITIES, INC., as lead
arranger and book manager (in such capacity, "Lead Arranger and Book Manager")
and the Lenders referred to below. In consideration of the mutual covenants and
agreements contained herein the parties hereto agree as follows:

                              W I T N E S S E T H

     WHEREAS, US Borrower, as borrower, All American and Plains MLP, as
guarantors, and Administrative Agent and certain lenders named therein entered
into that certain Credit Agreement [Revolving Credit Facility] dated May 8,
2000, as amended (the "Existing Agreement"), providing for extensions of credit
by such financial institutions to US Borrower up to the amount of $500,000,000;
and

     WHEREAS, US Borrower, All American and Plains MLP have requested that
Administrative Agent and the lenders under the Existing Agreement renew and
extend the aggregate unpaid principal balance of the loans, and participate in
outstanding letters of credit issued, thereunder and provide for the extension
of additional credit on the terms and conditions set forth herein;

     Accordingly, the parties hereto agree as follows:

                    ARTICLE I - Definitions and References
                                --------------------------

      Section 1.1.  Defined Terms.  As used in this Agreement, each of the
                    -------------
following terms has the meaning given to such term  in this Section 1.1 or in
the sections and subsections referred to below:

     "Administrative Agent" means Fleet National Bank, as Administrative Agent
      --------------------
hereunder, and its successors in such capacity.

     "Affiliate" means, as to any Person, each other Person that directly or
      ---------
indirectly (through one or more intermediaries or otherwise) controls, is
controlled by, or is under common control

                                       1
<PAGE>

with, such Person. A Person shall be deemed to be "controlled by" any other
Person if such other Person possesses, directly or indirectly, power

          (a) to vote 5% or more of the securities (on a fully diluted basis)
     having ordinary voting power for the election of directors or managing
     general partners; or

          (b) to direct or cause the direction of the management and policies of
     such Person whether by contract or otherwise.

     "Affiliate Agreements" means the Crude Oil Marketing Agreement and the
      --------------------
Omnibus Agreement.

     "Agent" means any of the Administrative Agent or Canadian Administration
      -----
Agent.

     "Aggregate Percentage Share" means, with respect to a Lender, the
      --------------------------
percentage obtained by dividing such Lender's Lender Commitment by the
Commitment.

     "Agreement" means this Credit Agreement.
      ---------

     "All American" means All American Pipeline, L.P., a Texas limited
      ------------
partnership.

     "Applicable Lending Office" means, for each Lender and for each Type of
      -------------------------
Loan, the "Lending Office" of such Lender (or of an Affiliate of such Lender)
designated for such Type of Loan on the Lender Schedule or such other office of
such Lender (or an Affiliate of such Lender) as such Lender may from time to
time specify to Administrative Agent and US Borrower by written notice in
accordance with the terms hereof as the office by which its Loans of such Type
are to be made and maintained.

     "Applicable Leverage Level" means the level set forth below that
      -------------------------
corresponds to the ratio of (i) Consolidated Funded Indebtedness of Plains MLP
and its Subsidiaries to (ii) the Consolidated EBITDA for the applicable period
of four Fiscal Quarters (the "Leverage Ratio"):

                                       2
<PAGE>

   ====================================================================
            Applicable
          Leverage Level              Leverage Ratio
          --------------              --------------
   --------------------------------------------------------------------
         Level I           greater than or equal to 4.50 to 1.0
   --------------------------------------------------------------------
         Level II          greater than or equal to 4.25 to 1.0
                                but less than 4.50 to 1.0
   --------------------------------------------------------------------
         Level III         greater than or equal to 4.00 to 1.0
                                but less than 4.25 to 1.0
   --------------------------------------------------------------------
         Level IV          greater than or equal to 3.50 to 1.0
                                but less than 4.00 to 1.0
   --------------------------------------------------------------------
         Level V           greater than or equal to 3.00 to 1.0
                                but less than 3.50 to 1.0
   --------------------------------------------------------------------
         Level VI          greater than or equal to 2.25 to 1.0
                                but less than 3.00 to 1.0
   --------------------------------------------------------------------
         Level VII         greater than or equal to 1.75 to 1.0
                                but less than 2.25 to 1.0
   --------------------------------------------------------------------
         Level VIII               less than 1.75 to 1.0
   ====================================================================

The Leverage Ratio will be determined as of the date hereof based upon the pro
forma Initial Financial Statements, and shall be determined thereafter quarterly
by Administrative Agent within two (2) Business Days after Administrative
Agent's receipt of Plains MLP's Consolidated financial statements for the
immediate preceding Fiscal Quarter based upon:  (i) Consolidated Funded
Indebtedness as of the end of such Fiscal Quarter, and (ii) the Consolidated
EBITDA for the four Fiscal Quarters ending with such Fiscal Quarter.  The
Applicable Leverage Level shall become effective upon such determination of the
Leverage Ratio by Administrative Agent and shall remain effective until the next
such determination by Administrative Agent of the Leverage Ratio.

     "Available Cash" has the meaning given such term in the Partnership
      --------------
Agreement.

     "BA Discount Rate" means, in respect of a BA being accepted by a Canadian
      ----------------
Revolver Lender on any date, (i) for a Canadian Revolver Lender that is listed
in Schedule I to the Bank Act (Canada), the average bankers' acceptance rate as
quoted on Reuters CDOR page (or such other page as may, from time to time,
replace such page on that service for the purpose of displaying quotations for
bankers' acceptances accepted by leading Canadian financial institutions) at
approximately 10:00 a.m. (Toronto, Ontario time) on such drawdown date for
bankers' acceptances having a comparable maturity date as the maturity date of
such BA (the "CDOR Rate"); or, if such rate is not available at or about such
              ---------
time, the average of the bankers' acceptance rates (expressed to five decimal
places) as quoted to the Canadian Administration Agent by the Schedule I BA
Reference Banks as of 10:00 a.m. (Toronto, Ontario time) on such drawdown date
for bankers' acceptances having a comparable maturity date as the maturity date
of such BA; and (ii) for a Canadian Revolver Lender that is listed in Schedule
II to the Bank Act (Canada) or a Canadian Revolver Lender that is listed in
Schedule III to the Bank Act

                                       3
<PAGE>

(Canada) that is not subject to the restrictions and requirements referred to in
subsection 524 (2) of the Bank Act (Canada), the rate established by the
Canadian Administration Agent to be the lesser of (A) the CDOR Rate plus 10
Basis Points and (B) the average of the bankers' acceptance rates (expressed to
five decimal places) as quoted to the Canadian Administration Agent by the
Schedule II BA Reference Banks as of 10:00 a.m. (Toronto, Ontario time) on such
drawdown date for bankers' acceptances having a comparable maturity date as the
maturity date of such BA.

     "BA Equivalent Advance" means a Canadian Revolver Advance provided
      ---------------------
hereunder by a Canadian Revolver Lender in lieu of accepting and purchasing a BA
pursuant to Section 2B.8(f).

     "Bankers' Acceptance" or "BA" means a Canadian Dollar draft of Canadian
      -------------------      --
Revolver Borrower, for a term selected by Canadian Revolver Borrower of either
one, two, three or six months (as reduced or extended by Canadian Administration
Agent, acting reasonably, to allow the maturity thereof to fall on a Business
Day) payable in Canada.

     "Bankruptcy and Insolvency Act (Canada)" means the Bankruptcy and
      --------------------------------------
Insolvency Act, S.C. 1992, c. 27, including the regulations made and, from time
to time, in force under that Act.

     "Base Rate Loan" means any US Base Rate Loan or Canadian Revolver Prime
      --------------
Rate Loan.

     "Borrowers"means, collectively, US Borrower, Term Borrower, and Canadian
      ---------
Revolver Borrower, and their successor and assigns; "Borrower" means,
                                                     --------
individually, any of such Persons.

     "Borrowing" means a borrowing of new Loans of a single Type pursuant to
      ---------
Section 2A.2 or 2B.2 or a Continuation or Conversion of existing Loans into a
single Type (and, in the case of LIBOR Loans, with the same Interest Period)
pursuant to Section 2A.3, 2B.3, or 2C.2 or the acceptance or purchase by
Canadian Revolver Lenders of Bankers' Acceptances issued by Canadian Revolver
Borrower under Section 2B.8.

     "Borrowing Notice" means a written or telephonic request, or a written
      ----------------
confirmation, made by a Borrower which meets the requirements of Section 2A.2 or
2B.2.

     "Business Day" means: (i) with respect to Canadian Obligations, a Canadian
      ------------
Business Day, and (ii) with respect to all other Obligations, a US Business Day.

     "Canadian Administration Agent" means The Toronto-Dominion Bank.
      -----------------------------

     "Canadian Business Day" means any day, other than a Saturday, Sunday or day
      ---------------------
which shall be in the Provinces of Ontario and Alberta a legal holiday or day on
which banking institutions are required or authorized to close.

     "Canadian Cash and Carry Purchases" means purchases of Petroleum Products
      ---------------------------------
for physical storage at any storage terminal, tankage or facility owned by any
Canadian Subsidiary

                                       4
<PAGE>

or in storage or in transit in pipelines Currently Approved by Majority Lenders
which constitute Hedged Canadian Eligible Inventory.

     "Canadian Eligible Inventory" means inventories of Petroleum Products in
      ---------------------------
which Canadian Revolver Borrower has lawful and absolute title (specifically
excluding, however, tank bottoms and pipeline linefill of any Restricted Person
classified as a long-term asset), which are not subject to any Lien in favor of
any Person (other than Permitted Canadian Inventory Liens), which are subject to
a fully perfected first priority security interest (subject only to Permitted
Canadian Inventory Liens) in favor of Administrative Agent pursuant to the Loan
Documents prior to the rights of, and enforceable as such against, any other
Person, which are otherwise satisfactory to Majority Lenders in their reasonable
business judgment and which are located in storage locations (including
pipelines) which are either (a) owned by a Restricted Person or (b) Currently
Approved by Majority Lenders minus without duplication the amount of any
Permitted Canadian Inventory Lien on any such inventory.  Canadian Eligible
Inventory shall specifically exclude inventory to be delivered in the current or
next succeeding trading month.

     "Canadian Commitment Period" means the period from and including the date
      --------------------------
hereof until the Canadian Revolver Maturity Date (or, if earlier, the day on
which the obligation of Canadian Revolver Lenders to make Canadian Revolver
Advances hereunder and the obligation of Canadian LC Issuer to issue Canadian
Letters of Credit hereunder has been terminated or the day on which any of the
Canadian Revolver Notes first becomes due and payable in full).

     "Canadian Dollars" and "C$" means the lawful currency of Canada.
      ----------------       --

     "Canadian LC Collateral" has the meaning given such term in Section
      ----------------------
2B.17(a).

     "Canadian LC Issuer" means The Toronto-Dominion Bank in its capacity as the
      ------------------
issuer of Canadian Letters of Credit hereunder, and its successors in such
capacity.  Canadian Administration Agent may, with the consent of Canadian
Revolver Borrower and the Canadian Revolver Lender in question, appoint any
Canadian Revolver Lender hereunder as a Canadian LC Issuer in place of or in
addition to The Toronto-Dominion Bank.

     "Canadian LC Obligations" means, at the time in question, the sum of all
      -----------------------
Matured Canadian LC Obligations plus the maximum amounts which Canadian LC
Issuer might then or thereafter be called upon to advance under all Canadian
Letters of Credit then outstanding.

     "Canadian Lender Parties" means Canadian Administration Agent, Canadian LC
      -----------------------
Issuer, and Canadian Revolver Lenders.

     "Canadian Letter of Credit" means any letter of credit issued by Canadian
      -------------------------
LC Issuer hereunder at the application of Canadian Revolver Borrower.

     "Canadian Letter of Credit Fee Rate" means, on any day, the rate per annum
      ----------------------------------
set forth on the Pricing Grid as the "Canadian LC Fee Rate" based on the
Applicable Leverage Level on such date.  Changes in the applicable Canadian
Letter of Credit Fee Rate will occur automatically

                                       5
<PAGE>

without prior notice as changes in the Applicable Leverage Level occur.
Administrative Agent will give notice promptly to Canadian Administration Agent
of any change (and its effective date) in the Applicable Leverage Level, and
Canadian Administration Agent will in turn give notice promptly to Canadian
Revolver Borrower and Canadian Revolver Lenders of such change in the Applicable
Leverage Level and the applicable Canadian Letter of Credit Fee Rate.

     "Canadian Obligations" means all Liabilities from time to time owing by any
      --------------------
Restricted Person to any Lender Party under or pursuant to any of the Canadian
Revolver Advances, Canadian Revolver Notes and Canadian Letters of Credit,
including all Canadian LC Obligations owing thereunder, or under or pursuant to
any guaranty of the obligations of Canadian Revolver Borrower under the Loan
Documents, or under or pursuant to any Security Document which secures the
payment and performance of such Liabilities.  "Canadian Obligation" means any
                                               -------------------
part of the Canadian Obligations.

     "Canadian Revolver Advances" has the meaning given to such term in Section
      --------------------------
2B.1.

     "Canadian Revolver Prime Rate" means on any day a fluctuating rate of
      ----------------------------
interest per annum equal to the higher of (i) the rate of interest per annum
most recently announced by Canadian Administration Agent as its reference rate
for Canadian Dollar commercial demand loans made to a Person in Canada; and (ii)
Canadian Administration Agent's discount rate for Bankers' Acceptances having a
maturity of one month plus the Canadian Revolver Prime Rate Margin plus one-half
percent (0.5%) per annum. Changes in the Canadian Revolver Prime Rate resulting
from changes in the foregoing described reference rate or discount rate shall
take place immediately without notice or demand of any kind.

     "Canadian Revolver Prime Rate Loan" means a Canadian Revolver Loan which
      ---------------------------------
bears interest at a rate based upon the Canadian Revolver Prime Rate.

     "Canadian Revolver Prime Rate Margin" means, on any day, the percent per
      -----------------------------------
annum set forth on the Pricing Grid as the "Canadian Revolver Prime Rate Margin"
based on the Applicable Leverage Level in effect on such date.  Changes in the
applicable Canadian Revolver Prime Rate Margin will occur automatically without
prior notice as changes in the Applicable Leverage Level occur.  Administrative
Agent will give notice promptly to Canadian Administration Agent of any change
(and its effective date) in the Applicable Leverage Level, and Canadian
Administration Agent will in turn give notice promptly to Canadian Revolver
Borrower and Canadian Revolver Lenders of such change in the Applicable Leverage
Level and the applicable Canadian Revolver Prime Rate Margin.

     "Canadian Revolver Borrower" means Plains Marketing Canada, L.P., an
      --------------------------
Alberta limited partnership.

     "Canadian Revolver Commitment" means, in Canadian Dollars, the Dollar
      ----------------------------
Equivalent of $30,000,000.  The Dollar Equivalent of each Canadian Revolver
Lender's Canadian Revolver Commitment shall be the amount set forth on the
Lender Schedule.

                                       6
<PAGE>

     "Canadian Revolver Commitment Fee Rate" means, on any day, the rate per
      -------------------------------------
annum set forth on the Pricing Grid as the "Canadian Revolver Commitment Fee
Rate" based on the Applicable Leverage Level on such date.  Changes in the
applicable Canadian Revolver Commitment Fee Rate will occur automatically
without prior notice as changes in the Applicable Leverage Level occur.
Administrative Agent will give notice promptly to Canadian Administration Agent
of any change (and its effective date) in the Applicable Leverage Level, and
Canadian Administration Agent will in turn give notice promptly to Canadian
Revolver Borrower and Canadian Revolver Lenders of such change in the Applicable
Leverage Level and the applicable Canadian Revolver Commitment Fee Rate.

     "Canadian Revolver Facility Usage" means, at the time in question, the
      --------------------------------
Dollar Equivalent of the aggregate amount of Canadian Revolver Advances and
Canadian LC Obligations then outstanding.

     "Canadian Revolver Lenders" means each signatory hereto designated as a
      -------------------------
Canadian Revolver Lender, and the successors and permitted assigns of each such
party as holder of a Canadian Revolver Note.

     "Canadian Revolver Loans" has the meaning given such term in Section 2B.1
      -----------------------
hereof.

     "Canadian Revolver Maturity Date" means April 30, 2005.
      -------------------------------

     "Canadian Revolver Notes" has the meaning given such term in Section 2B.1
      -----------------------
hereof.

     "Canadian Subsidiaries" means each of Term Borrower and Canadian Revolver
      ---------------------
Borrower, and each of their Subsidiaries, whether now owned or existing or
hereafter formed or acquired.

     "CanPet Acquisition" means the acquisition by US Borrower and Canadian
      ------------------
Revolver Borrower of all or substantially all of the assets of CanPet Energy
Group (USA) Inc. and CanPet Energy Group, Inc., respectively, pursuant to the
CanPet Acquisition Documents.

     "CanPet Acquisition Closing Date" means the date on which the CanPet
      -------------------------------
Acquisition shall have been consummated and US Borrower and Canadian Revolver
Borrower shall have taken good and defensible title to the assets subject
thereof.

     "CanPet Acquisition Documents" means the purchase and sale agreement, title
      ----------------------------
transfer documents and all other agreements or instruments executed and
delivered by US Borrower, Canadian Revolver Borrower, or any of their Affiliates
in connection therewith to consummate the CanPet Acquisition.

     "Capital Lease" means a lease with respect to which the lessee is required
      -------------
concurrently to recognize the acquisition of an asset and the incurrence of a
liability in accordance with GAAP.

                                       7
<PAGE>

     "Capital Lease Obligation" means, with respect to any Person and a Capital
      ------------------------
Lease, the amount of the obligation of such Person as the lessee under such
Capital Lease which would, in accordance with GAAP, appear as a liability on a
balance sheet of such Person.

     "Cash and Carry Purchases" means purchases of Petroleum Products for
      ------------------------
physical storage at a Plains Terminal or in storage or in transit in pipelines
Currently Approved by Majority Lenders which constitute Hedged Eligible
Inventory, as such terms are defined in the Marketing Credit Agreement.

     "Cash Equivalents" means Investments in:
      ----------------

     (a)  marketable obligations, maturing within 12 months after acquisition
thereof, issued or unconditionally guaranteed by the United States of America or
the federal government of Canada or an instrumentality or agency thereof and
entitled to the full faith and credit of the United States of America or the
federal government of Canada, as the case may be;

     (b)  demand deposits and time deposits (including certificates of deposit)
maturing within 12 months from the date of deposit thereof, (i) with any office
of any Lender or (ii) with a domestic office of any national, state or
provincial bank or trust company which is organized under the Laws of the United
States of America or any state therein, or the federal government of Canada or
any province therein, which has capital, surplus and undivided profits of at
least $500,000,000, and whose long term certificates of deposit are rated at
least Aa3 by Moody's or AA- by S&P;

     (c)  repurchase obligations with a term of not more than seven days for
underlying securities of the types described in subsection (a) above entered
into with (i) any Lender or (ii) any other commercial bank meeting the
specifications of subsection (b) above;

     (d)  open market commercial paper, maturing within 270 days after
acquisition thereof, which are rated at least P-1 by Moody's or A-1 by S&P; and

     (e)  money market or other mutual funds substantially all of whose assets
comprise securities of the types described in subsections (a) through (d) above.

     "Change of Control" means the occurrence of any of the following events:
      -----------------
(i) an event or series of events by which any Person or other entity or group of
Persons or other entities acting in concert as a partnership or other group (a
"Group of Persons") shall, as a result of a tender or exchange offer, open
market purchases, privately negotiated purchases, merger, consolidation or
otherwise, have become the beneficial owner (within the meaning of Rule 13d-3
under the Securities Exchange Act of 1934, as amended) of (A) 50% or more of the
combined voting power of the then outstanding voting stock of Resources, in the
case of any Person or Group of Persons constituting or controlled by Affiliates
of Kayne Anderson Investment Management, Inc., or (B) 40% or more of such
combined voting power in the case of any other Person or Group of Persons, (ii)
during any period of two consecutive years (A) the members of the board of
directors of Resources (the "Board") as of January 1, 2001, (B) any director
elected thereafter

                                       8
<PAGE>

in any annual meeting of the stockholders of Resources upon the recommendation
of the Board, and (C) any other member of the Board who will be recommended or
elected to succeed those Persons described in subclauses (A) and (B) of this
clause (ii) by a majority of such Persons who are then members of the Board,
cease for any reason to constitute collectively a majority of the Board then in
office, (iii) the direct or indirect sale, lease, exchange or other transfer of
all or substantially all of the Consolidated assets of Resources and its
Subsidiaries, to any Person or Group of Persons, or (iv) Resources, either
directly or through a Wholly Owned Subsidiary of Resources, shall cease to be
the legal and beneficial owner (as defined above) of more than 50% of the voting
power of the outstanding voting stock of General Partner, or General Partner
shall cease to be, directly or indirectly, the sole legal and beneficial owner
(as defined above) of all of the general partner interests (including all
securities which are convertible into general partner interests), of Plains MLP,
All American, or US Borrower, (v) any Person or Group of Persons other than
Resources or any Subsidiary of Resources shall be the legal and beneficial owner
(as defined above) of 50% or more of the combined voting power of the then total
partnership interests (including all securities which are convertible into
partnership interests) of Plains MLP, US Borrower, All American or any other
Restricted Person that is a partnership, (vi) Plains MLP or US Borrower shall
cease to be the sole legal and beneficial owner (as defined above) of all of the
limited partnership interests of US Borrower and All American, respectively
(including all securities which are convertible into limited partner interests),
(vii) US Borrower shall cease to be the direct or indirect owner of all capital
stock of Term Borrower or all partnership interests of Canadian Revolver
Borrower (other than the limited partnership interests of Canadian Revolver
Borrower that may be issued to CanPet Energy Group (USA), Inc. or CanPet Energy
Group Inc. as permitted under Section 7.4), or (viii) Resources and its Wholly
Owned Subsidiaries taken as a whole shall hold legal and beneficial ownership of
issued and outstanding partnership interests of Plains MLP representing less
than 5% of the total outstanding partnership interests of Plains MLP.

     "Co-Agent" shall have the meaning given that term in Section 9.10.
      --------

     "Code" means the Internal Revenue Code of 1986, as amended from time to
      ----
time, together with all rules and regulations promulgated with respect thereto.

     "Collateral" means all property of any kind which is subject to a Lien in
      ----------
favor of Lenders (or in favor of Administrative Agent, Canadian Administration
Agent, or the collateral agent under the Intercreditor Agreement for the benefit
of Lenders) or which, under the terms of any Security Document, is purported to
be subject to such a Lien, in each case granted or created to secure all or part
of the Obligations.

     "Commitment" means the sum of (a) the Canadian Revolver Commitment, plus
      ----------
(b) the US Commitment, plus (c) the outstanding principal balance of the Term
Notes, in each case as of the time of determination.

     "Companies' Creditors Arrangement Act (Canada)" means the Companies'
      ---------------------------------------------
Creditors Arrangement Act, R.S.C. 1985, c. C-36, including the regulations made
and from time to time in force under that Act.

                                       9
<PAGE>

     "Consolidated" refers to the consolidation of any Person, in accordance
      ------------
with GAAP, with its properly consolidated subsidiaries.  References herein to a
Person's Consolidated financial statements, financial position, financial
condition, liabilities, etc. refer to the consolidated financial statements,
financial position, financial condition, liabilities, etc. of such Person and
its properly consolidated subsidiaries.

     "Consolidated EBITDA" means, for any period, the sum of (1) the
      -------------------
Consolidated Net Income of Plains MLP and its Subsidiaries during such period,
plus (2) all interest expense which was deducted in determining such
Consolidated Net Income for such period, plus (3) all income taxes (including
any franchise taxes to the extent based upon net income) which were deducted in
determining such Consolidated Net Income, plus (4) all depreciation,
amortization (including amortization of good will and debt issue costs) and
other non-cash charges (including any provision for the reduction in the
carrying value of assets recorded in accordance with GAAP) which were deducted
in determining such Consolidated Net Income, plus (5) settlement payments made
in such period with respect to litigation arising out of the unauthorized
trading activity by US Borrower during the period of January 1, 1999 to November
20, 1999, not to exceed an aggregate amount of $6,963,000, minus (6) all non-
cash items of income which were included in determining such Consolidated Net
Income.

     "Consolidated Funded Indebtedness" means as of any date, the sum of the
      --------------------------------
following (without duplication):  (i) all Indebtedness which is classified as
"long-term indebtedness" on a consolidated balance sheet of Plains MLP and its
Consolidated Subsidiaries prepared as of such date in accordance with GAAP and
any current maturities and other principal amount in respect of such
Indebtedness due within one year but which was classified as "long-term
indebtedness" at the creation thereof, (ii) indebtedness for borrowed money of
Plains MLP and its Consolidated Subsidiaries outstanding under a revolving
credit or similar agreement providing for borrowings (and renewals and
extensions thereof) over a period of more than one year, notwithstanding the
fact that any such borrowing is made within one year of the expiration of such
agreement, and (iii) Indebtedness in respect of Capital Leases of Plains MLP and
its Consolidated Subsidiaries; provided, however, Consolidated Funded
Indebtedness shall not include Indebtedness in respect of letters of credit,
Cash and Carry Purchases, Canadian Cash and Carry Purchases or margin deposits.

     "Consolidated Net Income" means, for any period, Plains MLP's and its
      -----------------------
Subsidiaries' gross revenues for such period, including any cash dividends or
distributions actually received from any other Person during such period, minus
Plains MLP's and its Subsidiaries' expenses and other proper charges against
income (including taxes on income, to the extent imposed), determined on a
Consolidated basis after eliminating earnings or losses attributable to
outstanding minority interests and excluding the net earnings of any Person
other than a Subsidiary in which Plains MLP or any of its Subsidiaries has an
ownership interest. Consolidated Net Income shall not include (i) any gain or
loss from the sale of assets, (ii) any extraordinary gains or losses, or (iii)
any non- cash gains or losses resulting from mark to market activity as a result
of the implementation of SFAS 133.  In addition, Consolidated Net Income shall
not include the cost or proceeds of purchasing or selling options which are used
to hedge future activity, until the period in which such hedged future activity
occurs.

                                      10
<PAGE>

     "Consolidated Net Worth" means the remainder of all Consolidated assets, as
      ----------------------
determined in accordance with GAAP, of Plains MLP and its Subsidiaries minus the
sum of (a) Plains MLP's Consolidated liabilities, as determined in accordance
with GAAP, and (b) all outstanding Minority Interests.  The effect of any
increase or decrease in net worth in any period as a result of items of income
or loss not reflected in the determination of net income but reflected in the
determination of comprehensive income (to the extent provided under GAAP as in
effect on the date hereof) shall be excluded in determining Consolidated Net
Worth. "Minority Interests" means the book value of any equity interests in any
of Plains MLP's Subsidiaries (exclusive of the general partner interests held,
directly or indirectly, by the General Partner in US Borrower, All American or
any other Restricted Person and by Term Borrower in Canadian Revolver Borrower,
in each case, of up to two percent (2%) of the aggregate ownership interest in
any such Person) which equity interests are owned by a Person other than Plains
MLP or a Wholly Owned Subsidiary of Plains MLP.

     "Continue", "Continuation" and "Continued" shall refer to (i) the
      --------    ------------       ---------
continuation pursuant to Section 2A.3 or 2C.2 hereof of a LIBOR Loan as a LIBOR
Loan from one Interest Period to the next Interest Period and (ii) a rollover of
a Banker's Acceptance at maturity.

     "Continuation/Conversion Notice" means (i) a written or telephonic request,
      ------------------------------
or a written confirmation, made by a Borrower which meets the requirements of
Section 2A.3, 2B.3, or 2C.2.

     "Convert, "Conversion" and "Convert" refers to (i) a conversion pursuant to
      -------   ----------       -------
Section 2A.3 of one Type of US Loan into another Type of US Loan, (ii) a
conversion pursuant to Section 2B.3 of one Type of Canadian Revolver Advance
into another Type of Canadian Revolver Advance, and (iii) a conversion pursuant
to Section 2C.2 of one Type of Term Loan into another Type of Term Loan.

     "Crude Oil Marketing Agreement" means that certain Crude Oil Marketing
      -----------------------------
Agreement among Resources, Plains Illinois Inc., Stocker Resources, L.P.,
Arguello Inc. and Borrower dated November 23, 1998.

     "Current Trading Month" has the meaning given that term in Section 7.15.
      ---------------------

     "Currently Approved by Majority Lenders" means such Person (including a
      --------------------------------------
limit on the maximum credit exposure to any such Person), storage location,
pipeline, form of Letter of Credit or other matter as the case may be, as
reflected in the most recent written notice given by Administrative Agent to
Borrower as being approved by Majority Lenders.  Each such written notice will
supersede and revoke each prior notice.

     "Debt Coverage Ratio" shall have the meaning given that term in Section
      -------------------
7.12.

     "Default" means any Event of Default and any default, event or condition
      -------
which would, with the giving of any requisite notices and the passage of any
requisite periods of time, constitute an Event of Default.

                                      11
<PAGE>

     "Default Rate" means, at the time in question, two percent (2%) per annum
      ------------
plus:

          (a)  the US LIBOR Rate plus (i) the US LIBOR Rate Margin then in
     effect for each US LIBOR Loan (up to the end of the applicable Interest
     Period), or (ii) the Term LIBOR Rate Margin then in effect for each Term
     LIBOR Loan (up to the end of the applicable Interest Period),

          (b)  the US Base Rate plus (i) the US Base Rate Margin then in effect
     for each US Base Rate Loan, or (ii) the Term Base Rate Margin then in
     effect for each Term Loan, or

          (c)  the Canadian Revolver Prime Rate plus the Canadian Revolver Prime
     Rate Margin for each Canadian Revolver Prime Rate Loan;

provided, however, the Default Rate shall never exceed the Highest Lawful Rate.

     "Default Rate Period" means (i) any period during which an Event of
      -------------------
Default, other than pursuant to Section 8.1 (a) or (b), is continuing, provided
that such period shall not begin until notice of the commencement of the Default
Rate has been given to US Borrower, Term Borrower, or Canadian Revolver
Borrower, as applicable, by Administrative Agent upon the instruction by
Majority Lenders and (ii) any period during which any Event of Default pursuant
to Section 8.1 (a) or (b) is continuing unless US Borrower, Term Borrower, or
Canadian Revolver Borrower, as applicable, has been notified otherwise by
Administrative Agent upon the instruction by Majority Lenders.

     "Depository Bills and Notes Act (Canada)" means the Depository Bills and
      ---------------------------------------
Notes Act (Canada), R.S.C. 1998, c. 13, including the regulations made and, from
time to time, in force under that Act.

     "Disclosure Schedule" means Schedule 2 hereto.
      -------------------

     "Discount Proceeds" means, in respect of each Bankers' Acceptance, funds in
      -----------------
an amount which is equal to:

                       Face Amount
                       ------------------
                       1 + (Rate x Term)
                            ------------
                                365

(where "Face Amount" is the principal amount of the Bankers' Acceptance being
purchased, "Rate" is the BA Discount Rate divided by 100 and "Term" is the
number of days in the term of the Bankers' Acceptance.)

     "Dollar Equivalent" of any amount of any currency at any date means (i) if
      -----------------
such currency is Dollars, the amount of such currency, or (ii) if such currency
is Canadian Dollars, the equivalent in Dollars of such amount of such currency
based upon the rate of exchange for such conversion as quoted by the Bank of
Canada at approximately 12:00 noon, Toronto time (or, if

                                      12
<PAGE>

not so quoted, the spot rate of exchange quoted for wholesale transactions made
by Administrative Agent) on the date on or as of which such amount is to be
determined.

     "Dollars" and "$" means the lawful currency of the United States of
      -------       -
America, except where otherwise specified.

     "Effective Time" shall have the meaning given that term in Section 10.15.
      --------------

     "Eligible Transferee" means a Person which either (a) is a Lender, or (b)
      -------------------
is consented to as an Eligible Transferee by Administrative Agent and, so long
as no Default or Event of Default is continuing, by the relevant Borrower, which
consents in each case will not be unreasonably withheld (provided that no Person
organized outside the United States may be an Eligible Transferee with respect
to US Obligations if US Borrower or Term Borrower would be required to pay
withholding taxes on interest or principal owed to such Person and, provided
that no Person organized outside Canada may be an Eligible Transferee with
respect to Canadian Obligations if Canadian Revolver Borrower would be required
to pay withholding taxes on interest or principal owed to such Person).

     "Environmental Laws" means any and all Laws relating to the environment or
      ------------------
to emissions, discharges, releases or threatened releases of pollutants,
contaminants, chemicals, or industrial, toxic or hazardous substances or wastes
into the environment including ambient air, surface water, ground water, or
land, or otherwise relating to the manufacture, processing, distribution, use,
treatment, storage, disposal, transport, or handling of pollutants,
contaminants, chemicals, or industrial, toxic or hazardous substances or wastes.

     "Equity Offering Date" means the date on which the MLP, US Borrower or any
      --------------------
of their Wholly Owned Subsidiaries receive, in the aggregate, net proceeds of
not less than $40,000,000 from one or more private or public offerings of equity
securities made after April 15, 2001.

     "ERISA" means the Employee Retirement Income Security Act of 1974, as
      -----
amended from time to time, together with all rules and regulations promulgated
with respect thereto.

     "ERISA Affiliate" means each Restricted Person and all members of a
      ---------------
controlled group of corporations and all trades or businesses (whether or not
incorporated) under common control that, together with such Restricted Person,
are treated as a single employer under Section 414 of the Code.

     "ERISA Plan" means any employee pension benefit plan subject to Title IV of
      ----------
ERISA maintained by any ERISA Affiliate with respect to which any Restricted
Person has a fixed or contingent liability.

     "Event of Default" has the meaning given to such term in Section 8.1.
      ----------------

     "Existing Agreement" has the meaning given in the recitals hereto.
      ------------------

                                      13
<PAGE>

     "Federal Funds Rate" means, for any day, the rate per annum (rounded
      ------------------
upwards, if necessary, to the nearest 1/1000th of one percent) equal to the
weighted average of the rates on overnight Federal funds transactions with
members of the Federal Reserve System arranged by Federal funds brokers on such
day, as published by the Federal Reserve Bank of New York on the Business Day
next succeeding such day, provided that (i) if the day for which such rate is to
be determined is not a Business Day, the Federal Funds Rate for such day shall
be such rate on such transactions on the next preceding Business Day as so
published on the next succeeding Business Day, and (ii) if such rate is not so
published for any day, the Federal Funds Rate for such day shall be the average
rate quoted to Administrative Agent on such day on such transactions as
determined by Administrative Agent.

     "Fiscal Quarter" means a three-month period ending on March 31, June 30,
      --------------
September 30 or December 31 of any year.

     "Fiscal Year" means a twelve-month period ending on December 31 of any
      -----------
year.

     "Floating Price Contract" has the meaning given that term in Section 7.15.
      -----------------------

     "GAAP" means those generally accepted accounting principles and practices
      ----
which are recognized as such by the Financial Accounting Standards Board (or any
generally recognized successor) and which, in the case of Plains MLP and its
Consolidated Subsidiaries, are applied for all periods after the date hereof in
a manner consistent with the manner in which such principles and practices were
applied to the Initial Financial Statements.  If any change in any accounting
principle or practice is required by the Financial Accounting Standards Board
(or any such successor) in order for such principle or practice to continue as a
generally accepted accounting principle or practice, all reports and financial
statements required hereunder with respect to Plains MLP or with respect to
Plains MLP and its Consolidated Subsidiaries may be prepared in accordance with
such change, but all calculations and determinations to be made hereunder may be
made in accordance with such change only after notice of such change is given to
each Lender and Majority Lenders agree to such change insofar as it affects the
accounting of Plains MLP or of Plains MLP and its Consolidated Subsidiaries.

     "General Partner" means Plains All American Inc., a Delaware corporation.
      ---------------

     "Guarantors" means Plains MLP and all of its Subsidiaries (including All
      ----------
American but excluding US Borrower with respect to the US Commitment, Term
Borrower with respect to the Term Loan, and Canadian Revolver Borrower with
respect to the Canadian Obligations) and any other Person who has guaranteed
some or all of the Obligations and who has been accepted by Administrative Agent
as a Guarantor or any Subsidiary of Plains MLP which now or hereafter executes
and delivers a guaranty to Administrative Agent pursuant to Section 6.17.

     "Hazardous Materials" means any substances regulated under any
      -------------------
Environmental Law, whether as pollutants, contaminants, or chemicals, or as
industrial, toxic or hazardous substances or wastes, or otherwise.

                                      14
<PAGE>

     "Hedged Canadian Eligible Inventory" means:
      ----------------------------------

     (a)  Canadian Eligible Inventory or

     (b)  Petroleum Products inventory scheduled to be purchased in the
following month, which in either case has been

     (i)  hedged for delivery within the next 190 days (or as to liquefied
petroleum gases, within the next 365 days) by either

           (x) a contract on the NYMEX arranged through brokers approved by
     Administrative Agent and with whom a three-party agreement among Canadian
     Revolver Borrower, Administrative Agent and such broker has been entered in
     form and substance satisfactory to Administrative Agent or

          (y) a contract for physical delivery of such inventory (1) to a
     counterparty whose Debt Rating is either at least Baa3 by Moody's or at
     least BBB- by S&P (such Moody's or S&P reference being to the Canadian
     affiliate of each); (2) fully and unconditionally guaranteed as to payment
     by a Person whose Debt Rating is either at least Baa3 by Moody's or at
     least BBB- by S&P (such Moody's or S&P reference being to the Canadian
     affiliate of each); (3) from any other Person Currently Approved by
     Majority Lenders; or (4) fully covered by a letter of credit from any
     national or state bank or trust company which is organized under the
     federal laws of Canada or any province thereof or any branch licensed to
     operate under the federal laws of Canada or any province thereof, which is
     a branch of a bank organized under any country which is a member of the
     Organization for Economic Cooperation and Development, in each case which
     has capital, surplus and undivided profits of at least $500,000,000 and
     whose commercial paper is rated at least P-1 by Moody's or A-1 by S&P (such
     Moody's or S&P reference being to the Canadian affiliate of each), or

     (ii) otherwise hedged in a manner satisfactory to Majority Lenders.

The value of Hedged Canadian Eligible Inventory shall be the volume of the
inventory times the prices fixed in such hedge, minus all storage,
transportation and other applicable costs.

     "Hedging Contract" means (a) any agreement providing for options, swaps,
      ----------------
floors, caps, collars, forward sales or forward purchases involving interest
rates, commodities or commodity prices, equities, currencies, bonds, or indexes
based on any of the foregoing, (b) any option, futures or forward contract
traded on an exchange, and (c) any other derivative agreement or other similar
agreement or arrangement, excluding in each case for purposes of Section 7.3
only, any such agreement or contract covering Petroleum Products.

     "Highest Lawful Rate" means, with respect to each Lender Party to whom
      -------------------
Obligations are owed, the maximum nonusurious rate of interest that such Lender
Party is permitted under applicable Law to contract for, take, charge, or
receive with respect to such Obligations.  All

                                      15
<PAGE>

determinations herein of the Highest Lawful Rate, or of any interest rate
determined by reference to the Highest Lawful Rate, shall be made separately for
each Lender Party as appropriate to assure that the Loan Documents are not
construed to obligate any Person to pay interest to any Lender Party at a rate
in excess of the Highest Lawful Rate applicable to such Lender Party.

     "Incentive and Option Plans" means the Plains All American Inc. 1998 Long-
      --------------------------
Term Incentive Plan as in effect on the date hereof, the Plains All American
Inc. Management Incentive Plan as in effect on the date hereof and those certain
Transaction Grant Agreements disclosed in writing to Administrative Agent prior
to the date of this Agreement.

     "Income Tax Act (Canada)" means the Income Tax Act, R.S.C. 1985 c. 1 (fifth
      -----------------------
supplement), including the regulations made and, from time to time, in force
under that Act.

     "Indebtedness" of any Person means its Liabilities (without duplication) in
      ------------
any of the following categories:

     (a)  Liabilities for borrowed money,

     (b)  Liabilities constituting an obligation to pay the deferred purchase
price of property or services,

     (c)  Liabilities evidenced by a bond, debenture, note or similar
instrument,

     (d)  Liabilities (other than reserves for taxes and reserves for contingent
obligations) which (i) would under GAAP be shown on such Person's balance sheet
as a liability and (ii are payable more than one year from the date of creation
or incurrence thereof,

     (e)  Liabilities arising under Hedging Contracts (on a net basis to the
extent netting is provided for in the applicable Hedging Contract),

     (f)  Liabilities constituting principal under Capital Leases,

     (g)  Liabilities arising under conditional sales or other title retention
agreements,

     (h)  Liabilities owing under direct or indirect guaranties of Liabilities
of any other Person or otherwise constituting obligations to purchase or acquire
or to otherwise protect or insure a creditor against loss in respect of
Liabilities of any other Person (such as obligations under working capital
maintenance agreements, agreements to keep-well, or agreements to purchase
Liabilities, assets, goods, securities or services), but excluding endorsements
in the ordinary course of business of negotiable instruments in the course of
collection,

     (i)  Liabilities consisting of an obligation to purchase or redeem
securities or other property, if such Liabilities arises out of or in connection
with the sale or issuance of the same or similar securities or property (for
example, repurchase agreements, mandatorily redeemable preferred stock and
sale/leaseback agreements),

                                      16
<PAGE>

     (j)  Liabilities with respect to letters of credit or applications or
reimbursement agreements therefor,

     (k)  Liabilities with respect to banker's acceptances, or

     (l)  Liabilities with respect to obligations to deliver goods or services
in consideration of advance payments therefor;

provided, however, that the "Indebtedness" of any Person shall not include
Liabilities that were incurred in the ordinary course of business by such Person
on ordinary trade terms to vendors, suppliers, or other Persons providing goods
and services for use by such Person in the ordinary course of its business,
unless and until such Liabilities are outstanding more than 120 days after the
date the respective goods are delivered or the respective services are rendered,
other than Liabilities contested in good faith by appropriate proceedings, if
required, and for which adequate reserves are maintained on the books of such
Person in accordance with GAAP.

     "Initial Financial Statements" means (i) the audited Consolidated financial
      ----------------------------
statements of Plains MLP as of December 31, 2000, (ii) the unaudited
consolidating balance sheet and income statement of Plains MLP as of December
31, 2000, (iii) the unaudited Consolidated and consolidating balance sheet and
income statement of Plains MLP as of February 28, 2001, and (iv) the unaudited
pro forma Consolidated and consolidating balance sheet of Plains MLP as of
February 28, 2001, after giving effect to the Murphy Acquisition and the CanPet
Acquisition.

     "Insurance Schedule" means Schedule 4 attached hereto.
      ------------------

     "Intercreditor Agreement" means that certain Intercreditor Agreement of
      -----------------------
even date herewith among Administrative Agent, the Lenders and the other Lender
Parties, and the "Administrative Agent", the "Lenders" and the "LC Issuer" under
the Marketing Credit Agreement substantially in the form of Exhibit I hereto.

     "Interest Act (Canada)" means the Interest Act, R.S.C. 1985, c. I-15,
      ---------------------
including the regulations made and, from time to time, in force under that Act.

     "Interest Expense" means, with respect to any period, the sum (without
      ----------------
duplication) of the following (in each case, eliminating all offsetting debits
and credits between Plains MLP and its Subsidiaries and all other items required
to be eliminated in the course of the preparation of Consolidated financial
statements of Plains MLP and its Subsidiaries in accordance with GAAP): (a) all
interest and commitment fees in respect of Indebtedness of Plains MLP or any of
its Subsidiaries (including imputed interest on Capital Lease Obligations) which
are accrued during such period and whether expensed in such period or
capitalized; plus (b) all fees, expenses and charges in respect of letters of
credit issued for the account of Plains MLP or any of its Subsidiaries, which
are accrued during such period and whether expensed in such period or
capitalized.  The determination of Interest Expense for the Fiscal Quarter ended
March 31, 2000 shall exclude (i) interest and fees under the Paribas Linefill
Financing (as defined in the Existing Agreement), and (ii) interest paid under
the All American Agreement (as defined in the Existing

                                      17
<PAGE>

Agreement) with respect to a principal amount equal to the net proceeds applied
from the assets sold pursuant to the El Paso Longline Sale Agreement (as defined
in the Existing Agreement).

     "Interest Payment Date" means (a) with respect to each Base Rate Loan, the
      ---------------------
last day of each March, June, September and December beginning June 30, 2001,
and (b) with respect to each LIBOR Loan, the last day of the Interest Period
that is applicable thereto and, if such Interest Period is six, or twelve months
in length, the dates specified by Administrative Agent which are approximately
three, six, and nine months (as appropriate) after such Interest Period begins;
provided that the last Business Day of each calendar month shall also be an
Interest Payment Date for each such Loan so long as any Event of Default exists
under Section 8.1 (a) or (b).

     "Interest Period" means, with respect to each particular LIBOR Loan in a
      ---------------
Borrowing, the period specified in the Borrowing Notice or
Continuation/Conversion Notice applicable thereto, beginning on and including
the date specified in such Borrowing Notice or Continuation/Con  version Notice
(which must be a Business Day), and ending one, two, three, six or twelve months
(if twelve months is available for each Lender) thereafter, as US Borrower, Term
Borrower, or Canadian Revolver Borrower may elect in such notice; provided that:
(a) any Interest Period which would otherwise end on a day which is not a
Business Day shall be extended to the next succeeding Business Day unless such
Business Day falls in another calendar month, in which case such Interest Period
shall end on the next preceding Business Day; (b) any Interest Period which
begins on the last Business Day in a calendar month (or on a day for which there
is no numerically corresponding day in the calendar month at the end of such
Interest Period) shall end on the last Business Day in a calendar month; and (c)
notwithstanding the foregoing, no Interest Period may be selected for (i) a US
Loan that would end after the US Maturity Date, or (ii) a Term Loan that would
end after the Term Loan Maturity Date.

     "Investment" means any investment made, directly or indirectly in any
      ----------
Person, whether by acquisition of shares of capital stock, indebtedness or other
obligations or securities or by loan, advance, capital contribution or
otherwise, and whether made in cash, by the transfer of property or by any other
means.

     "Judgment Interest Act (Alberta)" means the Judgment Interest Act, S.A.
      -------------------------------
1984 c. J-O.5, including the regulations made and, from time to time, in force
under that Act.

     "Law" means any statute, law, regulation, ordinance, rule, treaty,
      ---
judgment, order, decree, permit, concession, franchise, license, agreement or
other governmental restriction of the United States or Canada or any state,
province, or political subdivision thereof or of any foreign country or any
department, state, province or other political subdivision thereof.

     "LC Application" means any application for a Letter of Credit hereafter
      --------------
made by US Borrower or Canadian Revolver Borrower to US LC Issuer or Canadian LC
Issuer.

     "LC Obligations" means: (i) with respect to US Lenders, US LC Obligations,
      --------------
and (ii) with respect to Canadian Revolver Lenders, Canadian LC Obligations.

                                      18
<PAGE>

     "Lender Commitment" means, with respect to a Lender, the sum of (a) the
      -----------------
greater of (i) such Lender's Canadian Revolver Commitment, and (ii) such
Lender's portion of the Canadian Facility Usage, plus (b) the greater of (i)
such Lender's US Commitment and (ii) such Lender's US Facility Usage, plus (c)
the outstanding principal balance of such Lender's Term Note, in each case as of
the time of determination.

     "Lender Parties" means Administrative Agent, US LC Issuer, Canadian
      --------------
Administration Agent, Canadian LC Issuer, and all Lenders.

     "Lenders" means, collectively, the US Lenders, the Term Lenders and the
      -------
Canadian Revolver Lenders.

     "Lender Schedule" means Schedule 1 hereto.
      ---------------

     "Letter of Credit" means any letter of credit issued by US LC Issuer
      ----------------
hereunder or under the Existing Agreement or any letter of credit issued by
Canadian LC Issuer hereunder at the application of US Borrower or Canadian
Revolver Borrower.

     "Liabilities" means, as to any Person, all indebtedness, liabilities and
      -----------
obligations of such Person, whether matured or unmatured, liquidated or
unliquidated, primary or secondary, direct or indirect, absolute, fixed or
contingent, and whether or not required to be considered pursuant to GAAP.

     "LIBOR Loan" means a Loan that bears interest at a rate based upon the US
      ----------
LIBOR Rate.

     "Lien" means, with respect to any property or assets, any right or interest
      ----
therein of a creditor to secure Liabilities owed to it or any other arrangement
with such creditor which provides for the payment of such Liabilities out of
such property or assets or which allows such creditor to have such Liabilities
satisfied out of such property or assets prior to the general creditors of any
owner thereof, including any lien, mortgage, security interest, pledge, deposit,
production payment, rights of a vendor under any title retention or conditional
sale agreement or lease substantially equivalent thereto, tax lien, mechanic's
or materialman's lien, or any other charge or encumbrance for security purposes,
whether arising by Law or agreement or otherwise, but excluding any right of
offset which arises without agreement in the ordinary course of business.
"Lien" also means any filed financing statement, any registration of a pledge
(such as with an issuer of uncertificated securities), or any other arrangement
or action which would serve to perfect a Lien described in the preceding
sentence, regardless of whether such financing statement is filed, such
registration is made, or such arrangement or action is undertaken before or
after such Lien exists.

     "Loan Documents" means this Agreement, the Notes, the Security Documents,
      --------------
the Letters of Credit, the LC Applications, the BAs, the Hedging Contracts
described in Sections 2A.14, 2B.18 and 2C.5, and all other agreements,
certificates, documents, instruments and writings at any time delivered in
connection herewith or therewith (exclusive of term sheets and commitment
letters).

                                      19
<PAGE>

     "Loans" means, collectively, the Term Loans, the Canadian Revolver
      -----
Advances, and the US Loans.

     "Majority Lenders" means Lenders whose Aggregate Percentage Shares exceed
      ----------------
sixty-six and two thirds percent (66 2/3%).

     "Marketing Credit Agreement" means that certain Amended and Restated Credit
      --------------------------
Agreement [Letter of Credit and Hedged Inventory Facility] of even date herewith
among US Borrower, All American and Plains MLP as guarantors, and the agents and
financial institutions as lenders named therein.

     "Material Adverse Change" means a material and adverse change, from the
      -----------------------
state of affairs presented in the Initial Financial Statements or as represented
or warranted in any Loan Document, to (a) Plains MLP's Consolidated financial
condition, (b) Plains MLP's Consolidated operations, properties or prospects,
considered as a whole, (c) US Borrower's, Term Borrower's, or Canadian Revolver
Borrower's ability to timely pay its Obligations, or (d) the enforceability of
the material terms of any Loan Document.

     "Matured LC Obligations" means the sum of all Matured Canadian LC
      ----------------------
Obligations and Matured US LC Obligations.

     "Matured Canadian LC Obligations" means all amounts paid by Canadian LC
      -------------------------------
Issuer on drafts or demands for payment drawn or made under or purported to be
under any Canadian Letter of Credit and all other amounts due and owing to
Canadian LC Issuer under any LC Application for any such Canadian Letter of
Credit, to the extent the same have not been repaid to Canadian LC Issuer (with
the proceeds of Loans or otherwise).

     "Matured US LC Obligations" means all amounts paid by US LC Issuer on
      -------------------------
drafts or demands for payment drawn or made under or purported to be under any
US Letter of Credit and all other amounts due and owing to US LC Issuer under
any LC Application for any such US Letter of Credit, to the extent the same have
not been repaid to US LC Issuer (with the proceeds of Loans or otherwise).

     "Moody's" means Moody's Investor Service, Inc., or its successor.
      -------

     "Murphy Acquisition" means the acquisition by Canadian Revolver Borrower of
      ------------------
certain assets from Murphy Oil Company Ltd. as previously disclosed by US
Borrower to Administrative Agent and Lenders pursuant to the Murphy Acquisition
Documents.

     "Murphy Acquisition Closing Date" means the date on which the Murphy
      -------------------------------
Acquisition shall have been consummated and Canadian Revolver Borrower shall
have taken good and defensible title to the assets subject thereof.

     "Murphy Acquisition Documents" means the purchase and sale agreement, title
      ----------------------------
transfer documents and all other agreements or instruments executed and
delivered by Canadian Revolver

                                      20
<PAGE>

Borrower or any Affiliate of Canadian Revolver Borrower in connection therewith
to consummate the Murphy Acquisition.

     "Net Proceeds" means with respect to any Bankers' Acceptance, the Discount
      ------------
Proceeds less the amount equal to the applicable Stamping Fee Rate multiplied by
the face amount of such Bankers' Acceptance.

     "Notes" means, collectively, the Term Notes, the Canadian Revolver Notes,
      -----
and the US Notes.

     "NYMEX" means the New York Mercantile Exchange.
      -----

     "Obligations" means, collectively, the US Obligations, the Canadian
      -----------
Obligations, and all other Liabilities from time to time owing by any Restricted
Person to any Lender Party under or pursuant to any of the Loan Documents,
including all US LC Obligations, all Canadian LC Obligations and Liabilities
arising under Hedging Contracts that are included in Loan Documents.
"Obligation" means any part of the Obligations.

     "Offsetting Position" means any offsetting sale or purchase agreement, an
      -------------------
offsetting NYMEX contract, an offsetting physical inventory position (excluding
tank bottoms and pipeline linefill inventory classified as a long term asset and
working inventory not held for resale), or an offsetting swap, collar or option
contract, in each case eliminating price risk and substantially all basis risk.

     "Omnibus Agreement" means that certain Omnibus Agreement between Resources,
      -----------------
Plains MLP, US Borrower, All American and General Partner dated November 23,
1998.

     "Open Position" means, with respect to Petroleum Products inventory or
      -------------
Petroleum Products purchase or sale contracts, any position that does not have
an Offsetting Position.

     "Partnership Agreement" means the Second Amended and Restated Agreement of
      ---------------------
Limited Partnership of Plains MLP dated November 23, 1998.

     "Percentage Share" means:
      ----------------

     (a)  with respect to US Loans and US Lenders, the percentage shown as each
US Lender's "US Percentage Share" on the Lender Schedule,

     (b)  with respect to Term Loans and Term Lenders, the percentage shown as
each Term Lender's "Term Percentage Share" on the Lender Schedule, and

     (c)  with respect to Canadian Revolver Advances and Canadian Revolver
Lenders, the percentage shown as each Canadian Revolver Lender's "Canadian
Revolver Percentage Share" on the Lender Schedule.

                                      21
<PAGE>

     "Permitted Acquisitions" means (A) the acquisition of all of the capital
      ----------------------
stock or other equity interest in a Person (exclusive of general partner
interests held by General Partner or another Wholly Owned Subsidiary of
Resources not in excess of a 1% economic interest and exclusive of director
qualifying shares and other equity interests required to be held by an Affiliate
to comply with a requirement of Law), (B) the CanPet Acquisition and the Murphy
Acquisition, or (C) any other acquisition of all or a portion of the business,
assets or operations of a Person (whether in a single transaction or a series of
related transactions), provided that (i) prior to and after giving effect to
such acquisition no Default or Event of Default shall have occurred and be
continuing; (ii) all representations and warranties shall be true and correct as
if restated immediately following the consummation of such acquisition; (iii)
substantially all of such business, assets and operations so acquired, or of the
Person so acquired, consists of Petroleum Products and/or gas marketing,
gathering, transportation, storage, terminaling and pipeline operation, and (iv)
(a) the total purchase price of any such acquisition does not exceed $5,000,000,
and (b) if the total purchase price of any such acquisition exceeds $5,000,000,
then the aggregate of the total purchase prices (including any assumed
Indebtedness) for all such acquisitions from the date hereof through the US
Maturity Date does not exceed $50,000,000 (which amount, for the avoidance of
doubt, excludes acquisitions described in the preceding clause (iv)(a)).

     "Permitted Canadian Inventory Liens" means any Lien, and the amount of any
      ----------------------------------
Liability secured thereby, on Petroleum Products inventory which would be a
Permitted Lien under Section 7.2(b) (so long as such Lien is inchoate) or
Section 7.2(d).

     "Permitted Investments" means:
      ---------------------

     (a)  Cash Equivalents,

     (b)  Investments described in the Disclosure Schedule,

     (c)  Investments by any Canadian Subsidiary in any other Restricted Person
that is a Borrower or Guarantor,

     (d)  Investments by Plains MLP or any of its Subsidiaries (other than any
Canadian Subsidiaries) in:

          (I)  any Wholly Owned Subsidiary of Plains MLP which is a Borrower or
     a Guarantor, other than any Canadian Subsidiary,

          (II) any Canadian Subsidiary with respect to the consummation of the
     Murphy Acquisition and the CanPet Acquisition, provided that (A) the
                                                    --------
     aggregate amount of such Investments in Canadian Subsidiaries shall not
     exceed (y) $57,000,000 with respect to the Murphy Acquisition, the proceeds
     of which shall be used to consummate the Murphy Acquisition, to fund
     Canadian Cash and Carry Purchases and for working capital purposes with
     respect to the Murphy Acquisition, and (z) $84,000,000 (including any
     Investment described in clause (y) above), such Investment in excess of the
     Investment

                                      22
<PAGE>

     described in clause (y) above with respect to the CanPet Acquisition, the
     proceeds of which shall be used to consummate the CanPet Acquisition, to
     fund Canadian Cash and Carry Purchases and for working capital purposes
     with respect to the CanPet Acquisition,

          (III) any Canadian Subsidiary pursuant to guaranties of trade payables
     of any Canadian Subsidiary incurred and paid in the ordinary course of
     business on ordinary trade terms,

          (IV)  US Borrower or Canadian Revolver Borrower consisting solely of
     units issued by Plains MLP to be used by US Borrower or Canadian Revolver
     Borrower to satisfy contingent payment obligations of such Persons as
     contemplated by the CanPet Acquisition Documents;

          (V)   any Canadian Subsidiary consisting solely of one or more loans,
     provided (A) the Canadian Revolver Facility Usage shall equal the Canadian
     Revolver Commitment, (B) the aggregate outstanding amount of all such loans
     shall not at any time exceed the Dollar Equivalent of $10,000,000, (C) the
     proceeds of each such loan shall be used solely as short-term working
     capital for specifically identified purposes, and (D) each such loan shall
     be repaid within 90 days after the making thereof from funds other than
     proceeds of loans made pursuant to this clause (V); and

          (VI)  any Canadian Subsidiary not covered by the preceding clauses
     (II), (III), (IV) or (V), provided the aggregate outstanding amount of such
     other Investments in Canadian Subsidiaries shall not at any time exceed the
     Dollar Equivalent of $5,000,000,

     (e)  Investments in publicly traded units of master limited partnerships
whose dividends are "qualifying income" as such term is defined in Section 7704
of the Code (provided, the amount of any such Investments under this clause (e)
             --------
minus any amounts received on such Investments (excluding dividends thereon)
-----
shall not at any time exceed the Dollar Equivalent of $5,000,000), and

     (f)  Permitted Acquisitions.

     "Permitted Lien" has the meaning given to such term in Section 7.2.
      --------------

     "Person" means an individual, corporation, partnership, limited liability
      ------
company, association, joint stock company, trust or trustee thereof, estate or
executor thereof, unincorporated organization or joint venture, Tribunal, or any
other legally recognizable entity.

     "Petroleum Products" means crude oil, condensate, natural gas liquids
      ------------------
(NGL's), liquefied petroleum gases (LPG's) or any blend thereof.

     "Plains MLP" means Plains All American Pipeline, L.P., a Delaware limited
      ----------
partnership.

                                      23
<PAGE>

     "Plains Terminal" means any storage terminal, tankage or facility owned by
      ---------------
any Restricted Person.

     "Pricing Grid" means Schedule 5 attached hereto.
      ------------

     "Rating Agency" means either S&P or Moody's.
      -------------

     "Regulation D" means Regulation D of the Board of Governors of the Federal
      ------------
Reserve System as from time to time in effect.

     "Resources" means Plains Resources Inc., a Delaware corporation.
      ---------

     "Restricted Person" means any of Plains MLP and each Subsidiary of Plains
      -----------------
MLP, including but not limited to US Borrower, All American, Term Borrower,
Canadian Revolver Borrower and each Subsidiary of US Borrower, All American,
Term Borrower, and Canadian Revolver Borrower.

     "S&P" means Standard & Poor's Ratings Group (a division of McGraw Hill,
      ---
Inc.) or its successor.

     "Schedule I BA Reference Banks" means the Lenders listed in Schedule I to
      -----------------------------
the Bank Act (Canada) as are, at such time, designated by Canadian
Administration Agent, with the prior consent of Canadian Revolver Borrower
(acting reasonably), as the Schedule I BA Reference Banks.

     "Schedule II BA Reference Banks" means the Lenders listed in Schedule II to
      ------------------------------
the Bank Act (Canada) as are, at such time, designated by Canadian
Administration Agent, with the prior consent of Canadian Revolver Borrower
(acting reasonably,) as the Schedule II BA Reference Banks.

     "Security Documents" means the instruments listed in the Security Schedule
      ------------------
and all other security agreements, deeds of trust, mortgages, chattel mortgages,
pledges, guaranties, financing statements, continuation statements, extension
agreements and other agreements or instruments now, heretofore, or hereafter
delivered by any Restricted Person to Administrative Agent in connection with
this Agreement or any transaction contemplated hereby to secure or guarantee the
payment of any part of the Obligations or the performance of any Restricted
Person's other duties and obligations under the Loan Documents.

     "Security Schedule" means Schedule 3 hereto.
      -----------------

     "Stamping Fee Rate" means the rate per annum set forth on the Pricing Grid
      -----------------
as the "Stamping Fee Rate" based on the Applicable Leverage Level on such date,
provided that during a Default Rate Period, the Stamping Fee Rate shall be
increased by two percent (2%).  Changes in the applicable Stamping Fee Rate will
occur automatically without prior notice as changes in the Applicable Leverage
Level occur and shall be effective with respect to BA's issued on and

                                      24
<PAGE>

after such change, but shall not apply with respect to any outstanding BA's.
Administrative Agent will give notice promptly to Canadian Administration Agent
of any change (and its effective date) in the Applicable Leverage Level, and
Canadian Administration Agent will in turn give notice promptly to Canadian
Revolver Borrower and Canadian Revolver Lenders of such change in the Applicable
Leverage Level and the applicable Stamping Fee Rate.

     "Subsidiary" means, with respect to any Person, any corporation,
      ----------
association, partnership, limited liability company, joint venture, or other
business or corporate entity, enterprise or organization which is directly or
indirectly (through one or more intermediaries) controlled or owned more than
fifty percent by such Person.

     "Term Base Rate Loan" means a Term Loan which does not bear interest at a
      -------------------
rate based upon the US LIBOR Rate.

     "Term Base Rate Margin" means, on any day (a) from the date hereof through
      ---------------------
but not including the earlier to occur of (i) the six-month anniversary of the
date hereof, or (ii) the Equity Offering Date, the greater of (A) 1.500% per
annum and (B) the percent per annum set forth on the Pricing Grid as the "Term
Base Rate Margin" based on the Applicable Leverage Level in effect on such date,
and (b) on and after such date, the percent per annum set forth on the Pricing
Grid as the "Term Base Rate Margin" based on the Applicable Leverage Level in
effect on such date.  Changes in the applicable Term Base Rate Margin will occur
automatically without prior notice as changes in the Applicable Leverage Level
occur.  Administrative Agent will give notice promptly to Term Borrower and Term
Lenders of changes in the Term Base Rate Margin.

     "Term Borrower" means PMC (Nova Scotia) Company, a Nova Scotia unlimited
      -------------
liability company.

     "Term Lenders" means each signatory hereto designated as a Term Lender, and
      ------------
the successors and each permitted assign of each such party as holder of a Term
Note.

     "Term LIBOR Loan" means a Term Loan that bears interest at a rate based
      ---------------
upon the US LIBOR Rate.

     "Term LIBOR Rate Margin" means, on any day (a) from the date hereof through
      ----------------------
but not including the earlier to occur of (i) the six-month anniversary of the
date hereof, or (ii) the Equity Offering Date, the greater of (A) 3.00% per
annum and (B) the percent per annum set forth on the Pricing Grid as the "Term
LIBOR Rate Margin" based on the Applicable Leverage Level in effect on such
date, and (b) on and after such date, the percent per annum set forth on the
Pricing Grid as the "Term LIBOR Rate Margin" based on the Applicable Leverage
Level in effect on such date.  Changes in the applicable Term LIBOR Rate Margin
will occur automatically without prior notice as changes in the Applicable
Leverage Level occur.  Administrative Agent will give notice promptly to Term
Borrower and Term Lenders of changes in the Term LIBOR Rate Margin.

     "Term Loan" has the meaning given such term in Section 2C.1 hereof.
      ---------

                                      25
<PAGE>

     "Term Loan Maturity Date" means May 5, 2006.
      -----------------------

     "Term Notes" has the meaning given such term in Section 2C.1 hereof.
      ----------

     "Termination Event" means (a) the occurrence with respect to any ERISA Plan
      -----------------
of (i) a reportable event described in Sections 4043(c)(5) or (6) of ERISA or
(ii) any other reportable event described in Section 4043(c) of ERISA other than
a reportable event not subject to the provision for 30-day notice to the Pension
Benefit Guaranty Corporation pursuant to a waiver by such corporation under
Section 4043(a) of ERISA, or (b) the withdrawal of any ERISA Affiliate from an
ERISA Plan during a plan year in which it was a "substantial employer" as
defined in Section 4001(a)(2) of ERISA, or (c) the filing of a notice of intent
to terminate any ERISA Plan or the treatment of any ERISA Plan amendment as a
termination under Section 4041 of ERISA, or (d) the institution of proceedings
to terminate any ERISA Plan by the Pension Benefit Guaranty Corporation under
Section 4042 of ERISA, or (e) any other event or condition which might
constitute grounds under Section 4042 of ERISA for the termination of, or the
appointment of a trustee to administer, any ERISA Plan.

     "Tribunal" means any government, any arbitration panel, any court or any
      --------
governmental department, commission, board, bureau, agency or instrumentality of
the United States of America, the Dominion of Canada, or any state, province,
commonwealth, nation, territory, possession, county, parish, town, township,
village or municipality, whether now or hereafter constituted or existing.

     "Type" means, with respect to any Loans, the characterization of such Loans
      ----
as US Base Rate Loans, Canadian Revolver Prime Rate Loans, US LIBOR Loans, or
BAs.

     "US Base Rate" means the higher of (i) the variable per annum rate of
      ------------
interest so designated from time to time by Administrative Agent as its "prime
rate", or (ii) the Federal Funds Rate plus one-half percent (0.5%) per annum.
The "prime rate" is a reference rate and does not necessarily represent the
lowest or best rate being charged to any customer.  Changes in the US Base Rate
resulting from changes in the "prime rate" shall take place immediately without
notice or demand of any kind.

     "US Base Rate Loan" means a US Loan or Term Loan which does not bear
      -----------------
interest at a rate based upon the US LIBOR Rate.

     "US Base Rate Margin" means the percent per annum set forth on the Pricing
      -------------------
Grid as the "US Base Rate Margin" based on the Applicable Leverage Level in
effect on such date.  Changes in the applicable US Base Rate Margin will occur
automatically without prior notice as changes in the Applicable Leverage Level
occur.  Administrative Agent will give notice promptly to US Borrower and US
Lenders of changes in the US Base Rate Margin.

     "US Borrower" means Plains Marketing, L.P., a Delaware limited partnership.
      -----------

                                      26
<PAGE>

     "US Business Day" means any day, other than a Saturday, Sunday or day which
      ---------------
shall be in the Commonwealth of Massachusetts a legal holiday or day on which
banking institutions are required or authorized to close.  Any Business Day in
any way relating to US LIBOR Loans (such as the day on which an Interest Period
begins or ends) must also be a day on which commercial banks settle payments in
London.

     "US Commitment" means $500,000,000.  Each US Lender's US Commitment shall
      -------------
be the amount set forth on the Lender Schedule.

     "US Commitment Fee Rate" means, on any day, the rate per annum set forth on
      ----------------------
the Pricing Grid as the "US Commitment Fee Rate" based on the Applicable
Leverage Level on such date.  Changes in the applicable US Commitment Fee Rate
will occur automatically without prior notice as changes in the Applicable
Leverage Level occur.  Administrative Agent will give notice promptly to US
Borrower and US Lenders of changes in the US Commitment Fee Rate.

     "US Commitment Period" means the period from and including the date hereof
      --------------------
until the US Maturity Date (or, if earlier, the day on which the obligation of
US Lenders to make US hereunder and the obligation of US LC Issuer to issue US
Letters of Credit hereunder has been terminated or the day on which any of the
US Notes first becomes due and payable in full).

     "US Facility Usage" means, at the time in question, the aggregate amount of
      -----------------
US Loans and US LC Obligations outstanding at such time.

     "US LC Collateral" has the meaning given such term in Section 2A.13(a).
      ----------------

     "US LC Issuer" means Fleet National Bank, in its capacity as the issuer of
      ------------
US Letters of Credit hereunder, and its successors in such capacity.
Administrative Agent may, with the consent of Borrower and the US Lender in
question, appoint any US Lender hereunder as a US LC Issuer in place of or in
addition to Fleet National Bank.

     "US LC Obligations" means, at the time in question, the sum of all Matured
      -----------------
US LC Obligations plus the maximum amounts which US LC Issuer might then or
thereafter be called upon to advance under all US Letters of Credit then
outstanding.

     "US Lender Parties" means Administrative Agent, US LC Issuer, US Lenders,
      -----------------
and Term Lenders.

     "US Lenders" means each signatory hereto designated as a US Lender, and the
      ----------
successors of each such party as holder of a US Note.

     "US Letter of Credit" means any letter of credit issued by US LC Issuer
      -------------------
hereunder at the application of US Borrower.

                                      27
<PAGE>

     "US Letter of Credit Fee Rate" means, on any day, the rate per annum set
      ----------------------------
forth on the Pricing Grid as the "US LC Fee Rate" based on the Applicable
Leverage Level on such date. Changes in the applicable US Letter of Credit Fee
Rate will occur automatically without prior notice as changes in the Applicable
Leverage Level occur.  Administrative Agent will give notice promptly to US
Borrower and US Lenders of changes in the US Letter of Credit Fee Rate.

     "US LIBOR Loan" means a US Loan that bears interest at a rate based upon
      -------------
the US LIBOR Rate.

     "US LIBOR Rate" means, as applicable to any US LIBOR Loan or Term LIBOR
      -------------
Loan within a Borrowing and with respect to the related Interest Period
therefor, the rate per annum (rounded upwards, if necessary, to the nearest
1/100 of 1%) as determined on the basis of offered rates for deposits in
Dollars, for a period of time comparable to such Interest Period which appears
on Telerate Page 3750 (or any successor page) as of 11:00 a.m. London time on
the day that is two Business Days preceding the first day of such US LIBOR Loan
or Term LIBOR Loan; provided, however, if the rate described above does not
appear on the Telerate system on any applicable interest determination date, the
US LIBOR Rate shall be the rate (rounded upwards as described above, if
necessary) for deposits in dollars for a period substantially equal to such
Interest Period on the Reuters Page "LIBOR" (or such other page as may replace
the LIBOR Page on that service for the purpose of displaying such rates), as of
11:00 a.m. (London time), on the date that is two Business Days prior to the
beginning of such Interest Period; provided, however, if more than one rate is
specified on Reuters Screen LIBOR Page, the applicable rate shall be the
arithmetic mean of all such rates (rounded upwards, if necessary, to the nearest
1/1000 of 1%).  If both the Telerate and Reuters system are unavailable, then
the US LIBOR Rate for that date will be determined on the basis of the offered
rates for deposits in Dollars for a period of time comparable to such Interest
Period which are offered by four major banks in the London interbank market at
approximately 11:00 a.m. London time, on the day that is two (2) Business Days
preceding the first day of such US LIBOR Loan or Term LIBOR Loan as selected by
Administrative Agent.  The principal London office of each of the four major
London banks will be requested to provide a quotation of its Dollar deposit
offered rate.  If at least two such quotations are provided, the rate for that
date will be the arithmetic mean of the quotations.  If fewer than two
quotations are provided as requested, the rate for that date will be determined
on the basis of the rates quoted for loans in Dollars to leading European banks
for a period of time comparable to such Interest Period offered by major banks
in New York City at approximately 11:00 a.m. New York City time, on the day that
is two Business Days preceding the first day of such US LIBOR Loan or Term LIBOR
Loan.  In the event that Administrative Agent is unable to obtain any such
quotation as provided above, it will be deemed that the US LIBOR Rate pursuant
to such US LIBOR Loan or Term LIBOR Loan cannot be determined.  In the event
that the Board of Governors of the Federal Reserve System shall impose a Reserve
Percentage with respect to LIBOR deposits of any Lender, then for any period
during which such Reserve Percentage shall apply, the US LIBOR Rate shall be
equal to the amount determined above divided by an amount equal to 1 minus the
Reserve Percentage.  "Reserve Percentage" means the maximum aggregate reserve
requirement (including all basic, supplemental, marginal, special, emergency and
other reserves) which is imposed on member banks of the Federal Reserve System
against "Euro-currency Liabilities" as defined in Regulation D.  Without

                                      28
<PAGE>

limiting the effect of the foregoing, the Reserve Percentage shall reflect any
other reserves required to be maintained by such member banks with respect to
(a) any category of liabilities which includes deposits by reference to which
the US LIBOR Rate is to be determined, or (b) any category of extensions of
credit or other assets which include US LIBOR Loans or Term LIBOR Loans.  The US
LIBOR Rate for any US LIBOR Loan or Term LIBOR Loan shall change whenever the
Reserve Percentage changes.

     "US LIBOR Rate Margin" means the percent per annum set forth on the Pricing
      --------------------
Grid as the "US LIBOR Rate Margin" based on the Applicable Leverage Level in
effect on such date. Changes in the applicable US LIBOR Rate Margin will occur
automatically without prior notice as changes in the Applicable Leverage Level
occur.  Administrative Agent will give notice promptly to US Borrower and US
Lenders of changes in the US LIBOR Rate Margin.

     "US Loans" has the meaning given such term in Section 2A.1 hereof.
      --------

     "US Maturity Date" means April 30, 2005.
      ----------------

     "US Notes" has the meaning given such term in Section 2A.1 hereof.
      --------

     "US Obligations" means all Liabilities from time to time owing by any
      --------------
Restricted Person to any Lender Party under or pursuant to any of the US Notes,
including all US LC Obligations owing thereunder, or the Term Notes, or under or
pursuant to any guaranty of the obligations of US Borrower or Term Borrower
under the Loan Documents, or under or pursuant to any Security Document which
secures the payment and performance of such Liabilities.  "US Obligation" means
                                                           -------------
any part of the US Obligations.

     "Wholly Owned Subsidiary" means any Subsidiary of a Person, all of the
      -----------------------
issued and outstanding stock, limited liability company membership interests, or
partnership interests of which (including all rights or options to acquire such
stock or interests) are directly or indirectly (through one or more
Subsidiaries) owned by such Person, excluding any general partner interests
owned, directly or indirectly, by General Partner in any such Subsidiary that is
a partnership, in each case such general partner interests not to exceed two
percent (2%) of the aggregate ownership interests of any such partnership and
directors' qualifying shares if applicable.

     "Working Capital Borrowings" has the meaning given to such term in Section
      --------------------------
2A.2(c) hereof.

     Section 1.2.  Exhibits and Schedules; Additional Definitions.  All
                   ----------------------------------------------
Exhibits and Schedules attached to this Agreement are a part hereof for all
purposes.  Reference is hereby made to the Security Schedule for the meaning of
certain terms defined therein and used but not defined herein, which definitions
are incorporated herein by reference.

     Section 1.3.  Amendment of Defined Instruments.  Unless the context
                   --------------------------------
otherwise requires or unless otherwise provided herein the terms defined in this
Agreement which refer to a

                                      29
<PAGE>

particular agreement, instrument or document also refer to and include all
renewals, extensions, modifications, amendments and restatements of such
agreement, instrument or document, provided that nothing contained in this
section shall be construed to authorize any such renewal, extension,
modification, amendment or restatement. All references to the term "Marketing
Credit Agreement" shall be deemed to be references to such agreement as such
agreement is executed and delivered by the parties thereto on the date hereof.

     Section 1.4.  References and Titles.  All references in this Agreement to
                   ---------------------
Exhibits, Schedules, articles, sections, subsections and other subdivisions
refer to the Exhibits, Schedules, articles, sections, subsections and other
subdivisions of this Agreement unless expressly provided otherwise.  Titles
appearing at the beginning of any subdivisions are for convenience only and do
not constitute any part of such subdivisions and shall be disregarded in
construing the language contained in such subdivisions.  The words "this
Agreement," "this instrument," "herein," "hereof," "hereby," "hereunder" and
words of similar import refer to this Agreement as a whole and not to any
particular subdivision unless expressly so limited.  The phrases "this section"
and "this subsection" and similar phrases refer only to the sections or
subsections hereof in which such phrases occur.  The word "or" is not exclusive,
and the word "including" (in its various forms) means "including without
limitation."  Pronouns in masculine, feminine and neuter genders shall be
construed to include any other gender, and words in the singular form shall be
construed to include the plural and vice versa, unless the context otherwise
requires.

     Section 1.5.  Calculations and Determinations.  All calculations under the
                   -------------------------------
Loan Documents of interest chargeable with respect to LIBOR Loans and of fees
shall be made on the basis of actual days elapsed (including the first day but
excluding the last) and a year of 360 days.  All other calculations of interest
made under the Loan Documents shall be made on the basis of actual days elapsed
(including the first day but excluding the last) and a year of 365 or 366 days,
as appropriate.  Each determination by a Lender Party of amounts to be paid
under Article III or any other matters which are to be determined hereunder by a
Lender Party (such as any US LIBOR Rate, Business Day, Interest Period, or
Reserve Percentage) shall, in the absence of manifest error, be conclusive and
binding.  Unless otherwise expressly provided herein or unless Majority Lenders
otherwise consent all financial statements and reports furnished to any Lender
Party hereunder shall be prepared and all financial computations and
determinations pursuant hereto shall be made in accordance with GAAP.

              ARTICLE IIA - The US Loans and US Letters of Credit
                            -------------------------------------

     Section 2A.1.  Commitments to Lend; US Notes.  Subject to the terms and
                    -----------------------------
conditions hereof, each US Lender agrees to make loans to US Borrower (herein
called such US Lender's "US Loans") upon US Borrower's request from time to time
                         --------
during the US Commitment Period, provided that (a) subject to Sections 3.3, 3.4
and 3.6, all US Lenders are requested to make US Loans of the same Type in
accordance with their respective Percentage Shares and as part of the same
Borrowing, (b) after giving effect to such US Loans, the US Facility Usage does
not exceed the US Commitment determined as of the date on which the requested US
Loans are to be made, and (c) after giving effect to such US Loans the US Loans
by each US Lender plus the existing US LC Obligations of such US Lender does not
exceed such US Lender's Commitment.  The

                                      30
<PAGE>

aggregate amount of all US Loans in any Borrowing must be equal to $2,000,000 or
any higher integral multiple of $250,000. The obligation of US Borrower to repay
to each US Lender the aggregate amount of all US Loans made by such US Lender to
US Borrower, together with interest accruing in connection therewith, shall be
evidenced by a single promissory note (herein called such US Lender's "US Note")
                                                                       -------
made by US Borrower payable to the order of such US Lender in the form of
Exhibit A-1 with appropriate insertions. The amount of principal owing on any US
Lender's US Note at any given time shall be the aggregate amount of all US Loans
theretofore made by such US Lender minus all payments of principal theretofore
received by such US Lender on such US Note. Interest on each US Note shall
accrue and be due and payable as provided herein and therein. Each US Note shall
be due and payable as provided herein and therein, and shall be due and payable
in full on the US Maturity Date. Subject to the terms and conditions of this
Agreement, US Borrower may borrow, repay, and reborrow under this Section 2A.1.
US Borrower may have no more than seven Borrowings of LIBOR Loans outstanding at
any time. All payments of principal and interest on the US Loans shall be made
in Dollars.

     Section 2A.2.  Requests for US Loans.  US Borrower must give to
                    ---------------------
Administrative Agent written notice (or telephonic notice promptly confirmed in
writing) of any requested Borrowing of US Loans to be funded by US Lenders.
Each such notice constitutes a "Borrowing Notice" hereunder and must:

          (a)  specify (i) the aggregate amount of any such Borrowing of new US
     Base Rate Loans and the date on which such US Base Rate Loans are to be
     advanced, or (ii) the aggregate amount of any such Borrowing of new US
     LIBOR Loans, the date on which such US LIBOR Loans are to be advanced
     (which shall be the first day of the Interest Period which is to apply
     thereto), and the length of the applicable Interest Period; and

          (b)  be received by Administrative Agent not later than 11:00 a.m.,
     Boston, Massachusetts time, on (i) the day on which any such US Base Rate
     Loans are to be made, or (ii) the third Business Day preceding the day on
     which any such US LIBOR Loans are to be made.

          (c)  If any requested Borrowing of US Loans or portion thereof is to
     be utilized by US Borrower exclusively for working capital purposes (such
     Borrowing or such portion being called a "Working Capital Borrowing"), US
     Borrower shall specify in the Borrowing Notice that such Borrowing or such
     portion is a Working Capital Borrowing. In addition, any repayment of a US
     Loan that is intended as a repayment of all or any part of the outstanding
     amount of one or more Working Capital Borrowings shall be so identified to
     the Administrative Agent at the time of such repayment.

Each such written request or confirmation must be made in the form and substance
of the "Borrowing Notice" attached hereto as Exhibit B-1, duly completed.  Each
such telephonic request shall be deemed a representation, warranty,
acknowledgment and agreement by US Borrower as to the matters which are required
to be set out in such written confirmation.  Upon receipt of any such Borrowing
Notice, Administrative Agent shall give each US Lender prompt

                                      31
<PAGE>

notice of the terms thereof. If all conditions precedent to such new US Loans
have been met, each US Lender will on the date requested promptly remit to
Administrative Agent at Administrative Agent's office in Boston, Massachusetts
the amount of such US Lender's new US Loan in immediately available funds, and
upon receipt of such funds, unless to its actual knowledge any conditions
precedent to such US Loans have been neither met nor waived as provided herein,
Administrative Agent shall promptly make such US Loans available to US Borrower.
Unless Administrative Agent shall have received prompt notice from a US Lender
that such US Lender will not make available to Administrative Agent such US
Lender's new US Loan, Administrative Agent may in its discretion assume that
such US Lender has made such US Loan available to Administrative Agent in
accordance with this section, and Administrative Agent may if it chooses, in
reliance upon such assumption, make such US Loan available to US Borrower. If
and to the extent such US Lender shall not so make its new US Loan available to
Administrative Agent, such US Lender and US Borrower severally agree to pay or
repay to Administrative Agent within three days after demand the amount of such
US Loan together with interest thereon, for each day from the date such amount
was made available to US Borrower until the date such amount is paid or repaid
to Administrative Agent, with interest at (i) the Federal Funds Rate, if such US
Lender is making such payment and (ii) the interest rate applicable at the time
to the other new US Loans made on such date, if US Borrower is making such
repayment. If neither such US Lender nor US Borrower pays or repays to
Administrative Agent such amount within such three-day period, Administrative
Agent shall be entitled to recover from US Borrower, on demand in lieu of the
interest provided for in the preceding sentence, interest thereon at the Default
Rate, calculated from the date such amount was made available to US Borrower.
The failure of any US Lender to make any new US Loan to be made by it hereunder
shall not relieve any other US Lender of its obligation hereunder, if any, to
make its new US Loan, but no US Lender shall be responsible for the failure of
any other US Lender to make any new Loan to be made by such other US Lender. All
Borrowings of US Loans shall be advanced to US Borrower in Dollars.

     Section 2A.3.  Continuations and Conversions of Existing US Loans.  US
                    --------------------------------------------------
Borrower may make the following elections with respect to US Loans already
outstanding: to Convert, in whole or in part, US Base Rate Loans to US LIBOR
Loans, to Convert, in whole or in part, US LIBOR Loans to US Base Rate Loans on
the last day of the Interest Period applicable thereto, and to Continue, in
whole or in part, US LIBOR Loans beyond the expiration of such Interest Period
by designating a new Interest Period to take effect at the time of such
expiration.  In making such elections, US Borrower may combine existing US Loans
made pursuant to separate Borrowings into one new Borrowing or divide existing
US Loans made pursuant to one Borrowing into separate new Borrowings, provided
that US Borrower may have no more than seven Borrowings of US LIBOR Loans
outstanding at any time.  To make any such election, US Borrower must give to
Administrative Agent written notice (or telephonic notice promptly confirmed in
writing) of any such Conversion or Continuation of existing US Loans, with a
separate notice given for each new Borrowing.  Each such notice constitutes a
"Continuation/Conversion Notice" hereunder and must:

          (a)  specify the existing US Loans which are to be Continued or
     Converted;

                                      32
<PAGE>

          (b)  specify (i) the aggregate amount of any Borrowing of US Base Rate
     Loans into which such existing US Loans are to be Continued or Converted
     and the date on which such Continuation or Conversion is to occur, or (ii)
     the aggregate amount of any Borrowing of US LIBOR Loans into which such
     existing US Loans are to be Continued or Converted, the date on which such
     Continuation or Conversion is to occur (which shall be the first day of the
     Interest Period which is to apply to such US LIBOR Loans), and the length
     of the applicable Interest Period; and

          (c)  be received by Administrative Agent not later than 11:00 a.m.,
     Boston, Massachusetts time, on (i) the day on which any such Continuation
     or Conversion to US Base Rate Loans is to occur, or (ii) the third Business
     Day preceding the day on which any such Continuation or Conversion to US
     LIBOR Loans is to occur.

Each such written request or confirmation must be made in the form and substance
of the "Continuation/Conversion Notice" attached hereto as Exhibit C-1, duly
completed.  Each such telephonic request shall be deemed a representation,
warranty, acknowledgment and agreement by US Borrower as to the matters which
are required to be set out in such written confirmation. Upon receipt of any
such Continuation/Conversion Notice, Administrative Agent shall give each US
Lender prompt notice of the terms thereof.  Each Continuation/Conversion Notice
shall be irrevocable and binding on US Borrower.  During the continuance of any
Default, US Borrower may not make any election to Convert existing US Loans into
US LIBOR Loans or Continue existing US Loans as US LIBOR Loans beyond the
expiration of their respective and corresponding Interest Period then in effect.
If (due to the existence of a Default or for any other reason) US Borrower fails
to timely and properly give any Continuation/Conversion Notice with respect to a
Borrowing of existing US LIBOR Loans at least three days prior to the end of the
Interest Period applicable thereto, such US LIBOR Loans, to the extent not
prepaid at the end of such Interest Period, shall automatically be Converted
into US Base Rate Loans at the end of such Interest Period.  No new funds shall
be repaid by US Borrower or advanced by any US Lender in connection with any
Continuation or Conversion of existing US Loans pursuant to this section, and no
such Continuation or Conversion shall be deemed to be a new advance of funds for
any purpose; such Continuations and Conversions merely constitute a change in
the interest rate applicable to already outstanding Loans.

     Section 2A.4.  Use of Proceeds.  US Borrower shall use (i) all US Loans
                    ---------------
designated as Working Capital Borrowings pursuant to Section 2A.2(c) to provide
working capital (including, without limitation, to make distributions to the
partners of Restricted Persons), and (ii) all US Loans not designated as Working
Capital Borrowings pursuant to Section 2A.2(c) to (a) refinance all outstanding
indebtedness under the Existing Agreement, and (b) finance capital expenditures
of any Restricted Person, pay reimbursement obligations of US Letters of Credit,
provide working capital for operations and for other general business purposes,
including acquisitions, but not to pay distributions to partners of Restricted
Persons. US Borrower shall use all US Letters of Credit for its and its
Subsidiaries' general corporate purposes (but not to pay distributions to
partners of Restricted Persons) including in relation to the purchase or
exchange by US Borrower of Petroleum Products.  In no event shall the funds from
any US Loan or any US Letter of Credit be used directly or indirectly by any
Person for personal, family, household

                                      33
<PAGE>

or agricultural purposes or for the purpose, whether immediate, incidental or
ultimate, of purchasing, acquiring or carrying any "margin stock" (as such term
is defined in Regulation U promulgated by the Board of Governors of the Federal
Reserve System) or to extend credit to others directly or indirectly for the
purpose of purchasing or carrying any such margin stock. US Borrower represents
and warrants that US Borrower is not engaged principally, or as one of US
Borrower's important activities, in the business of extending credit to others
for the purpose of purchasing or carrying such margin stock.

     Section 2A.5.  Interest Rates and Fees.
                    -----------------------

     (a)  Interest Rates.  Each US Loan shall bear interest as follows: (i)
          --------------
unless the Default Rate shall apply, (A) each US Base Rate Loan shall bear
interest on each day outstanding at the US Base Rate plus the US Base Rate
Margin in effect on such day, and (B) each US LIBOR Loan shall bear interest on
each day during the related Interest Period at the related US LIBOR Rate plus
the US LIBOR Rate Margin in effect on such day, and (ii) during a Default Rate
Period, all US Loans shall bear interest on each day outstanding at the
applicable Default Rate.  If an Event of Default based upon Section 8.1(a),
Section 8.1(b) or, with respect to US Borrower, based upon Section 8.1(i)(i),
(i)(ii) or (i)(iii) exists and the US Loans are not bearing interest at the
Default Rate, the past due principal and past due interest shall bear interest
on each day outstanding at the applicable Default Rate.  The interest rate shall
change whenever the applicable US Base Rate, the US LIBOR Rate, US Base Rate
Margin, or the US LIBOR Rate Margin changes.  In no event shall the interest
rate on any US Loan exceed the Highest Lawful Rate.

     (b)  Commitment Fees.  In consideration of each US Lender's commitment to
          ---------------
make US Loans, US Borrower will pay to Administrative Agent for the account of
each US Lender a commitment fee determined on a daily basis equal to the US
Commitment Fee Rate in effect on such day times such US Lender's Percentage
Share of the unused portion of the US Commitment on each day during the US
Commitment Period, determined for each such day by deducting from the amount of
the US Commitment at the end of such day the US Facility Usage.  This commitment
fee shall be due and payable in arrears on the last day of each Fiscal Quarter
and at the end of the US Commitment Period.  US Borrower shall have the right
from time to time to permanently reduce the US Commitment, provided that (i)
notice of such reduction is given not less than 2 Business Days prior to such
reduction, (ii) the resulting US Commitment is not less than the US Facility
Usage and (iii) each partial reduction shall be in an amount at least equal to
$500,000 and in multiples of $100,000 in excess thereof.

     (c)  Administrative Agent's Fees.  In addition to all other amounts due to
          ---------------------------
Administrative Agent under the Loan Documents, US Borrower will pay fees to
Administrative Agent as described in a letter agreement of even date herewith
between Administrative Agent and US Borrower.

     Section 2A.6.  Optional Prepayments.  US Borrower may, upon three Business
                    --------------------
Days' notice, as to US LIBOR Loans, or one Business Day's notice, as to US Base
Rate Loans, to Administrative Agent (and Administrative Agent will promptly give
notice to the other US

                                      34
<PAGE>

Lenders) from time to time and without premium or penalty prepay the US Loans,
in whole or in part, so long as the aggregate amounts of all partial prepayments
of principal on the US Loans equals $1,000,000 or any higher integral multiple
of $250,000, and so long as US Borrower does not make any prepayments which
would reduce the unpaid principal balance of the US Loans to less than $100,000
without first either (i) terminating this Agreement or (ii) providing assurance
satisfactory to Administrative Agent in its discretion that US Lenders' legal
rights under the Loan Documents are in no way affected by such reduction. Upon
receipt of any such notice, Administrative Agent shall give each US Lender
prompt notice of the terms thereof. Each prepayment of principal of a US Loan
under this section shall be accompanied by all interest then accrued and unpaid
on the principal so prepaid. Any principal or interest prepaid pursuant to this
section shall be in addition to, and not in lieu of, all payments otherwise
required to be paid under the Loan Documents at the time of such prepayment.

     Section 2A.7.  Mandatory Prepayments.
                    ---------------------

     (a)  Without limiting the requirements of Section 7.5 hereof regarding the
consent of Majority US Lenders to sales of property by Restricted Persons which
are not permitted by Section 7.5, the proceeds of any sale of property (net of
all reasonable costs and expenses, but excluding proceeds consisting of tangible
property to be used in the business of Restricted Persons) by any Restricted
Person (other than a sale of property permitted under Section 7.5 hereof) shall
be placed in a collateral account under the control of Administrative Agent in a
manner satisfactory to Administrative Agent immediately upon such Restricted
Person's receipt of such proceeds and maintained therein for a period of ninety
(90) days following the date of receipt thereof in cash (in this Section 2A.7(a)
referred to as the "Collateral Period").  If  any consideration consists of an
                    -----------------
instrument or security, the Collateral Period shall, with respect to each amount
of cash received in respect thereof, continue until ninety (90) days following
such Restricted Person's receipt of such cash unless, pursuant to the following
sentence, an approved investment included such cash; any cash in a collateral
account may be invested in Cash Equivalents designated by US Borrower.  During
each Collateral Period, US Borrower may propose to invest such proceeds in other
property subject to the approval of Majority US Lenders, and shall thereafter
invest such proceeds in such property so approved by Majority US Lenders.  At
the end of each Collateral Period or, if an investment is so proposed and
approved during such Collateral Period, within one hundred-eighty (180) days
after such proposed investment has been so approved by Majority US Lenders, any
such proceeds which have not been so invested by US Borrower shall be applied to
the reduction of the outstanding principal balance of the US Loans at such time,
and the US Commitment shall be reduced by an amount equal to the prepayment
applied to the US Loans.

     (b)  If at any time the US Facility Usage exceeds the US Commitment
(whether due to a reduction in the US Commitment in accordance with this
Agreement, or otherwise), US Borrower shall immediately upon demand prepay the
principal of the US Loans in an amount at least equal to such excess. Each
prepayment of principal under this section shall be accompanied by all interest
then accrued and unpaid on the principal so prepaid. Any principal or interest
prepaid pursuant to this section shall be in addition to, and not in lieu of,
all payments otherwise required to be paid under the Loan Documents at the time
of such prepayment.

                                      35
<PAGE>

     Section 2A.8.  US Letters of Credit.  Subject to the terms and conditions
                    --------------------
hereof, US Borrower may during the US Commitment Period request US LC Issuer to
issue, amend, or extend the expiration date of, one or more US Letters of
Credit, provided that, after taking such US Letter of Credit into account:

          (a)  the US Facility Usage does not exceed the US Commitment at such
     time;

          (b)  the aggregate amount of US LC Obligations at such time does not
     exceed $10,000,000;

          (c)  the expiration date of such US Letter of Credit is prior to the
     earlier of (i) one (1) year after the date of issuance of such US Letter of
     Credit or (ii) the end of the US Commitment Period;

          (d)  such US Letter of Credit is to be used for general corporate
     purposes of US Borrower or any of its Subsidiaries and is not directly or
     indirectly used to assure payment of or otherwise support any Indebtedness
     of any Person, except Indebtedness of a Restricted Person;

          (e)  the issuance of such US Letter of Credit will be in compliance
     with all applicable governmental restrictions, policies, and guidelines and
     will not subject US LC Issuer to any cost which is not reimbursable under
     Article III;

          (f)  the form and terms of such US Letter of Credit are acceptable to
     US LC Issuer in its sole and absolute discretion; and

          (g)  all other conditions in this Agreement to the issuance of such US
     Letter of Credit have been satisfied.

US LC Issuer will honor any such request if the foregoing conditions (a) through
(g) (in the following Section 2A.9 called the "US LC Conditions") have been met
                                               ----------------
as of the date of issuance, amendment, or extension of the expiration, of such
US Letter of Credit.

     Section 2A.9.  Requesting US Letters of Credit.  US Borrower must make
                    -------------------------------
written application for any US Letter of Credit at least two Business Days
before the date on which US Borrower desires for US LC Issuer to issue such US
Letter of Credit.  By making any such written application, unless otherwise
expressly stated therein, US Borrower shall be deemed to have represented and
warranted that the US LC Conditions described in Section 2A.8 will be met as of
the date of issuance of such US Letter of Credit.  Each such written application
for a US Letter of Credit must be made in writing in the form and substance of
Exhibit G-1, the terms and provisions of which are hereby incorporated herein by
reference (or in such other form as may mutually be agreed upon by US LC Issuer
and US Borrower).  If all US LC Conditions for a US Letter of Credit have been
met as described in Section 2A.8 on any Business Day before 11:00 a.m., Boston,
Massachusetts time, US LC Issuer will issue such US Letter of Credit on the same
Business Day at US LC Issuer's office in Boston, Massachusetts.  If the US LC
Conditions are

                                      36
<PAGE>

met as described in Section 2A.8 on any Business Day on or after 11:00 a.m.,
Boston, Massachusetts time, US LC Issuer will issue such US Letter of Credit on
the next succeeding Business Day at US LC Issuer's office in Boston,
Massachusetts. If any provisions of any US LC Application conflict with any
provisions of this Agreement, the provisions of this Agreement shall govern and
control.

     Section 2A.10.  Reimbursement and Participations.
                     --------------------------------

     (a)  Reimbursement by US Borrower.  Each Matured US LC Obligation shall
          ----------------------------
constitute a loan by US LC Issuer to US Borrower.  US Borrower promises to pay
to US LC Issuer, or to US LC Issuer's order, on demand, the full amount of each
Matured US LC Obligation, together with interest thereon  (i) at the US Base
Rate plus the US Base Rate Margin to and including the second Business Day after
the Matured US LC Obligation is incurred and (ii) at the Default Rate on each
day thereafter.

     (b)  US Letter of Credit Advances.  If the beneficiary of any US Letter of
          ----------------------------
Credit makes a draft or other demand for payment thereunder then US Borrower
may, during the interval between the making thereof and the honoring thereof by
US LC Issuer, request US Lenders to make US Loans to US Borrower in the amount
of such draft or demand, which US Loans shall be made concurrently with US LC
Issuer's payment of such draft or demand and shall be immediately used by US LC
Issuer to repay the amount of the resulting Matured US LC Obligation.  Such a
request by US Borrower shall be made in compliance with all of the provisions
hereof, provided that for the purposes of the first sentence of Section 2A.1,
the amount of such US Loans shall be considered, but the amount of the Matured
US LC Obligation to be concurrently paid by such US Loans shall not be
considered.

     (c)  Participation by US Lenders.  US LC Issuer irrevocably agrees to grant
          ---------------------------
and hereby grants to each US Lender, and -- to induce US LC Issuer to issue US
Letters of Credit hereunder -- each US Lender irrevocably agrees to accept and
purchase and hereby accepts and purchases from US LC Issuer, on the terms and
conditions hereinafter stated and for such US Lender's own account and risk an
undivided interest equal to such US Lender's Percentage Share of US LC Issuer's
obligations and rights under each US Letter of Credit issued hereunder and the
amount of each Matured US LC Obligation paid by US LC Issuer thereunder.  Each
US Lender unconditionally and irrevocably agrees with US LC Issuer that, if a
Matured US LC Obligation is paid under any US Letter of Credit for which US LC
Issuer is not reimbursed in full by US Borrower in accordance with the terms of
this Agreement and the related US LC Application (including any reimbursement by
means of concurrent US Loans or by the application of US LC Collateral), such US
Lender shall (in all circumstances and without set-off or counterclaim) pay to
US LC Issuer on demand, in immediately available funds at US LC Issuer's address
for notices hereunder, such US Lender's Percentage Share of such Matured US LC
Obligation (or any portion thereof which has not been reimbursed by US
Borrower).  Each US Lender's obligation to pay US LC Issuer pursuant to the
terms of this subsection is irrevocable and unconditional.  If any amount
required to be paid by any US Lender to US LC Issuer pursuant to this subsection
is paid by such US Lender to US LC Issuer within three Business Days after the
date such payment is due, US LC Issuer shall in addition to such amount be
entitled to recover from such US

                                      37
<PAGE>

Lender, on demand, interest thereon calculated from such due date at the Federal
Funds Rate. If any amount required to be paid by any US Lender to US LC Issuer
pursuant to this subsection is not paid by such US Lender to US LC Issuer within
three Business Days after the date such payment is due, US LC Issuer shall in
addition to such amount be entitled to recover from such US Lender, on demand,
interest thereon calculated from such due date at the US Base Rate plus the US
Base Rate Margin.

     (d)  Distributions to Participants.  Whenever US LC Issuer has in
          -----------------------------
accordance with this section received from any US Lender payment of such US
Lender's Percentage Share of any Matured US LC Obligation, if US LC Issuer
thereafter receives any payment of such Matured US LC Obligation or any payment
of interest thereon (whether directly from US Borrower or by application of US
LC Collateral or otherwise, and excluding only interest for any period prior to
US LC Issuer's demand that such US Lender make such payment of its Percentage
Share), US LC Issuer will distribute to such US Lender its Percentage Share of
the amounts so received by US LC Issuer; provided, however, that if any such
                                         --------  -------
payment received by US LC Issuer must thereafter be returned by US LC Issuer,
such US Lender shall return to US LC Issuer the portion thereof which US LC
Issuer has previously distributed to it.

     (e)  Calculations.  A written advice setting forth in reasonable detail the
          ------------
amounts owing under this section, submitted by US LC Issuer to US Borrower or
any US Lender from time to time, shall be conclusive, absent manifest error, as
to the amounts thereof.

     Section 2A.11.  US Letter of Credit Fees.  In consideration of US LC
                     ------------------------
Issuer's issuance of any US Letter of Credit, US Borrower agrees to pay (i) to
Administrative Agent for the account of each US Lender in proportion to its
Percentage Share, a US Letter of Credit fee equal to the US Letter of Credit Fee
Rate applicable each day times the face amount of such US Letter of Credit and
(ii) to such US LC Issuer for its own account, a letter of credit fronting fee
at a rate equal to one-eighth percent (.125%) per annum times the face amount of
such US Letter of Credit.  Each such fee will be calculated on the face amount
of each US Letter of Credit outstanding on each day at the above applicable
rates and will be payable quarterly in arrears on the last day of each March,
June, September and December.  In addition, US Borrower will pay to US LC Issuer
a minimum administrative issuance fee and such other fees and charges
customarily charged by the US LC Issuer in respect of any issuance, amendment or
negotiation of any US Letter of Credit in accordance with the US LC Issuer's
published schedule of such charges effective as of the date of such amendment or
negotiation.

     Section 2A.12.  No Duty to Inquire.
                     ------------------

     (a)  Drafts and Demands.  US LC Issuer is authorized and instructed to
          ------------------
accept and pay drafts and demands for payment under any US Letter of Credit
without requiring, and without responsibility for, any determination as to the
existence of any event giving rise to said draft, either at the time of
acceptance or payment or thereafter.  US LC Issuer is under no duty to determine
the proper identity of anyone presenting such a draft or making such a demand
(whether by tested telex or otherwise) as the officer, representative or agent
of any beneficiary under any US Letter of Credit, and payment by US LC Issuer to
any such beneficiary when

                                      38
<PAGE>

requested by any such purported officer, representative or agent is hereby
authorized and approved. US Borrower releases each Lender Party from, and agrees
to hold each Lender Party harmless and indemnified against, any liability or
claim in connection with or arising out of the subject matter of this section,
which indemnity shall apply whether or not any such liability or claim is in any
way or to any extent caused, in whole or in part, by any negligent act or
omission of any kind by any Lender Party, provided only that no Lender Party
shall be entitled to indemnification for that portion, if any, of any liability
or claim which is proximately caused by its own individual gross negligence or
willful misconduct, as determined in a final judgment.

     (b)  Extension of Maturity.  If the maturity of any US Letter of Credit is
          ---------------------
extended by its terms or by Law or governmental action, if any extension of the
maturity or time for presentation of drafts or any other modification of the
terms of any US Letter of Credit is made at the request of US Borrower, or if
the amount of any US Letter of Credit is increased at the request of US
Borrower, this Agreement shall be binding upon all Restricted Persons with
respect to such US Letter of Credit as so extended, increased or otherwise
modified, with respect to drafts and property covered thereby, and with respect
to any action taken by US LC Issuer, US LC Issuer's correspondents, or any US
Lender Party in accordance with such extension, increase or other modification.

     (c)  Transferees of US Letters of Credit.  If any US Letter of Credit
          -----------------------------------
provides that it is transferable, US LC Issuer shall have no duty to determine
the proper identity of anyone appearing as transferee of such US Letter of
Credit, nor shall US LC Issuer be charged with responsibility of any nature or
character for the validity or correctness of any transfer or successive
transfers, and payment by US LC Issuer to any purported transferee or
transferees as determined by US LC Issuer is hereby authorized and approved, and
US Borrower releases each US Lender Party from, and agrees to hold each US
Lender Party harmless and indemnified against, any liability or claim in
connection with or arising out of the foregoing, which indemnity shall apply
whether or not any such liability or claim is in any way or to any extent
caused, in whole or in part, by any negligent act or omission of any kind by any
Lender Party, provided only that no Lender Party shall be entitled to
indemnification for that portion, if any, of any liability or claim which is
proximately caused by its own individual gross negligence or willful misconduct,
as determined in a final judgment.

     Section 2A.13.  US LC Collateral.
                     ----------------

     (a)  US LC Obligations in Excess of Commitment. If, after the making of all
          -----------------------------------------
mandatory prepayments required under Section 2A.7, the outstanding US LC
Obligations will exceed the US Commitment, then in addition to prepayment of the
entire principal balance of the US Loans US Borrower will immediately pay to US
LC Issuer an amount equal to such excess. US LC Issuer will hold such amount as
collateral security for the remaining US LC Obligations (all such amounts held
as collateral security for US LC Obligations being herein collectively called
"US LC Collateral") and the other Obligations, and such collateral may be
 ----------------
applied from

                                      39
<PAGE>

time to time to any Matured US LC Obligations or any other Obligations which are
due and payable. Neither this subsection nor the following subsection shall,
however, limit or impair any rights which US LC Issuer may have under any other
document or agreement relating to any US Letter of Credit, US LC Collateral or
US LC Obligation, including any US LC Application, or any rights which any US
Lender Party may have to otherwise apply any payments by US Borrower and any US
LC Collateral under Section 3A.1.

     (b)  Acceleration of US LC Obligations.  If the Obligations or any part
          ---------------------------------
thereof become immediately due and payable pursuant to Section 8.1 then, unless
all US Lenders otherwise specifically elect to the contrary (which election may
thereafter be retracted by any US Lender at any time), all US LC Obligations
shall become immediately due and payable without regard to whether or not actual
drawings or payments on the US Letters of Credit have occurred, and US Borrower
shall be obligated to pay to US LC Issuer immediately an amount equal to the
aggregate US LC Obligations which are then outstanding to be held as US LC
Collateral.

     (c)  Investment of US LC Collateral.  Pending application thereof, all US
          ------------------------------
LC Collateral shall be invested by US LC Issuer in such Cash Equivalents as US
LC Issuer may choose in its sole discretion. All interest on (and other proceeds
of) such Investments shall be reinvested or applied to Matured US LC Obligations
or the US Loans which are due and payable. When all Obligations have been
satisfied in full, including all US LC Obligations, all US Letters of Credit
have expired or been terminated, and all of US Borrower's reimbursement
obligations in connection therewith have been satisfied in full, US LC Issuer
shall release any remaining US LC Collateral. US Borrower hereby assigns and
grants to US LC Issuer for the benefit of US Lenders a continuing security
interest in all US LC Collateral paid by it to US LC Issuer, all Investments
purchased with such US LC Collateral, and all proceeds thereof to secure its
Matured US LC Obligations and its Obligations under this Agreement, each US
Note, and the other Loan Documents, and US Borrower agrees that such US LC
Collateral, Investments and proceeds shall be subject to all of the terms and
conditions of the Security Documents. US Borrower further agrees that US LC
Issuer shall have all of the rights and remedies of a secured party under the
Uniform Commercial Code as adopted in the State of New York with respect to such
security interest and that an Event of Default under this Agreement shall
constitute a default for purposes of such security interest.

     (d)  Payment of US LC Collateral.  When US Borrower is required to provide
          ---------------------------
US LC Collateral for any reason and fails to do so on the day when required, US
LC Issuer or Administrative Agent may without prior notice to US Borrower or any
other Restricted Person provide such US LC Collateral (whether by application of
proceeds of other Collateral, by transfers from other accounts maintained with
US LC Issuer, or otherwise) using any available funds of US Borrower or any
other Person also liable to make such payments, and US LC Issuer or
Administrative Agent will give notice thereof to US Borrower promptly after such
application or transfer.  Any such amounts which are required to be provided as
US LC Collateral and which are not provided on the date required shall, for
purposes of each Security Document, be considered past due Obligations owing
hereunder, and US LC Issuer is hereby authorized to exercise its respective
rights under each Security Document to obtain such amounts.

                                      40
<PAGE>

     Section 2A.14.  Hedging Contracts.  All Hedging Contracts permitted
                     -----------------
hereunder entered into with any one or more US Lenders or their Affiliates shall
be deemed to be Obligations and be secured by all Collateral; subject, however,
to the provisions of the Intercreditor Agreement.

     ARTICLE IIB - The Canadian Revolver Advances and Canadian Letters of Credit
                   -------------------------------------------------------------

     Section 2B.1.  Canadian Revolver Advances.  Subject to the terms and
                    --------------------------
conditions hereof, each Canadian Revolver Lender agrees to extend credit to
Canadian Revolver Borrower by advancing funds to Canadian Revolver Borrower
specified in a Borrowing Notice (herein called such Canadian Revolver Lender's
"Canadian Revolver Loans") and accepting and purchasing drafts of Bankers'
 -----------------------
Acceptances issued under this Agreement by Canadian Revolver Borrower specified
in a Borrowing Notice (herein called such Canadian Revolver Lender's "Bankers'
                                                                      --------
Acceptances"; each Canadian Revolver Lender's Canadian Revolving Loans and
-----------
Bankers' Acceptances are herein collectively called such Canadian Revolver
Lender's "Canadian Revolver Advances") upon Canadian Revolver Borrower's request
          --------------------------
from time to time during the Canadian Commitment Period, provided that (a)
subject to Sections 3.3, 3.4, and 3.6, all Canadian Revolver Lenders are
requested to make Canadian Revolver Advances of the same Type in accordance with
their respective Percentage Shares and as part of the same Borrowing, (b) after
giving effect to such Canadian Revolver Advances, the Canadian Revolver Facility
Usage does not exceed the Canadian Revolver Commitment determined as of the date
on which the requested Canadian Revolver Advances are to be made, and (c) after
giving effect to such Canadian Revolver Advances the Canadian Revolver Advances
by each Canadian Revolver Lender plus the existing Canadian LC Obligations of
such Canadian Revolver Lender does not exceed such Canadian Revolver Lender's
Canadian Revolver Commitment.  The aggregate amount of all Canadian Revolver
Loans in any Borrowing must equal to C$500,000 or any higher integral multiple
of C$100,000. The obligation of Canadian Revolver Borrower to repay to each
Canadian Revolver Lender the aggregate amount of all Canadian Revolver Loans
made by such Canadian Revolver Lender to Canadian Revolver Borrower, together
with interest accruing in connection therewith, shall be evidenced by a single
promissory note (herein called such Canadian Revolver Lender's "Canadian
                                                                --------
Revolver Note") made by Canadian Revolver Borrower payable to the order of such
-------------
Canadian Revolver Lender in the form of Exhibit A-2  with appropriate
insertions.  The amount of principal owing on any Canadian Revolver Lender's
Canadian Revolver Note at any given time shall be the aggregate amount of all
Canadian Revolver Loans theretofore made by such Canadian Revolver Lender minus
all payments of principal theretofore received by such Canadian Revolver Lender
on such Canadian Revolver Note.  Interest on each Canadian Revolver Note shall
accrue and be due and payable as provided herein and therein.  Each Canadian
Revolver Lender's Canadian Revolver Note shall be due and payable as provided
herein and therein and shall be due and payable in full on the Canadian Revolver
Maturity Date.  Subject to the terms and conditions of this Agreement, Canadian
Revolver Borrower may borrow, repay, and reborrow under this Section 2B.1.
Canadian Revolver Borrower may have no more than seven Borrowings of BA's
collectively outstanding at any time.  All payments of principal and interest on
the Canadian Revolver Loans shall be made in the currency in which such
corresponding Canadian Revolver Loan was funded.  All Canadian Revolver Loans
shall be made in Canadian Dollars, or, upon the written request of Canadian
Revolver Borrower, in Dollars.

                                      41
<PAGE>

     Section 2B.2.  Requests for New Canadian Revolver Advances.  The Canadian
                    -------------------------------------------
Revolver Borrower must give to Canadian Administration Agent written notice (or
telephonic notice promptly confirmed in writing) of any requested Borrowing of
Canadian Revolver Loans to be funded by Canadian Revolver Lenders and any
requested Borrowing by way of Bankers' Acceptances.  Each such notice
constitutes a "Borrowing Notice" hereunder and must:

          (a)  specify (i) the aggregate amount of any such Borrowing of new
     Canadian Revolver Prime Rate Loans and the date on which such Canadian
     Revolver Prime Rate Loans are to be advanced, or (ii the aggregate amount
     of any such Borrowing by way of Bankers' Acceptances (subject to Section
     2B.2(f)), and the date on which such Bankers' Acceptances are to be
     accepted and the maturity of such Bankers' Acceptances; and

          (b)  be received by Canadian Administration Agent not later than 10:00
     a.m., Toronto, Ontario time, on (i) the day on which any such Canadian
     Revolver Prime Rate Loans are to be made, or (ii) the third Business Day
     before such Bankers' Acceptances are to be issued.

Each such written request or confirmation must be made in the form and substance
of the "Borrowing Notice" attached hereto as Exhibit B-2, duly completed.  Each
such telephonic request shall be deemed a representation, warranty,
acknowledgment and agreement by Canadian Revolver Borrower as to the matters
which are required to be set out in such written confirmation.  Upon receipt of
any such Borrowing Notice, Canadian Administration Agent shall give each
Canadian Revolver Lender prompt notice of the terms thereof.  If all conditions
precedent to such new Canadian Revolver Advances have been met, each Canadian
Revolver Lender will on the date requested promptly remit to Canadian
Administration Agent at Canadian Administration Agent's office in Toronto,
Ontario the amount of such Canadian Revolver Lender's new Canadian Revolver
Advance in immediately available funds, and upon receipt of such funds, unless
to its actual knowledge any conditions precedent to such Canadian Revolver
Advances have been neither met nor waived as provided herein, Canadian
Administration Agent shall promptly make such Canadian Revolver Advances
available to Canadian Revolver Borrower or each Canadian Lender will accept
drafts of Bankers' Acceptances on the date requested in accordance with Sections
2B.1 through 2B.3.  Unless Canadian Administration Agent shall have received
prompt notice from a Canadian Revolver Lender that such Canadian Revolver Lender
will not make available to Canadian Administration Agent such Canadian Revolver
Lender's new Canadian Revolver Advance, Canadian Administration Agent may in its
discretion assume that such Canadian Revolver Lender has made such Canadian
Revolver Advance available to Canadian Administration Agent in accordance with
this section, and Canadian Administration Agent may if it chooses, in reliance
upon such assumption, make such Canadian Revolver Advance available to Canadian
Revolver Borrower.  If and to the extent such Canadian Revolver Lender shall not
so make its new Canadian Revolver Advance available to Canadian Administration
Agent, such Canadian Revolver Lender and Canadian Revolver Borrower severally
agree to pay or repay to Canadian Administration Agent within three days after
demand the amount of such Canadian Revolver Advance together with interest
thereon, for each day from the date such amount was made available to the
applicable Canadian Borrower until the date such amount is paid or repaid to
Canadian Administration Agent, with interest at

                                      42
<PAGE>

(i) the Canadian Revolver Prime Rate, if such Canadian Revolver Lender is making
such payment and (ii) the interest rate applicable at the time to the other new
Canadian Revolver Advances made on such date, if Canadian Borrower is making
such repayment. If neither such Canadian Revolver Lender nor Canadian Revolver
Borrower pays or repays to Canadian Administration Agent such amount within such
three-day period, Canadian Administration Agent shall be entitled to recover
from Canadian Revolver Borrower, on demand in lieu of the interest provided for
in the preceding sentence, interest thereon at the Default Rate, calculated from
the date such amount was made available to Canadian Revolver Borrower. The
failure of any Canadian Revolver Lender to make any new Canadian Revolver
Advance to be made by it hereunder shall not relieve any other Canadian Revolver
Lender of its obligation hereunder, if any, to make its new Canadian Revolver
Advance, but no Canadian Revolver Lender shall be responsible for the failure of
any other Canadian Revolver Lender to make any new Canadian Revolver Advance to
be made by such other Canadian Revolver Lender. All Borrowings of Canadian
Revolver Loans shall be advanced to Canadian Revolver Borrower in Canadian
Dollars, or, upon the written request of Canadian Revolver Borrower, in Dollars
in an amount equal to the Dollar Equivalent of such requested Canadian Revolver
Loan.

     Section 2B.3.  Continuations and Conversions of Existing Canadian Revolver
                    -----------------------------------------------------------
Advances. Subject to the terms of Section 2B.9 with respect to Bankers'
--------
Acceptances, Canadian Revolver Borrower may make the following elections with
respect to Canadian Revolver Advances already outstanding:  (i) to Convert any
Type of Canadian Revolver Advance to any other Type of Canadian Revolver
Advance, provided that any such Conversion of a Bankers' Acceptance must be made
on the date of maturity thereof; and (ii to rollover any existing Bankers'
Acceptance by designating the new maturity date applicable thereto.  In making
such elections, Canadian Revolver Borrower may combine existing Canadian
Revolver Advances made pursuant to separate Borrowings into one new Borrowing or
divide existing Canadian Revolver Advances made pursuant to one Borrowing into
separate new Borrowings, provided that Canadian Revolver Borrower may have no
more than seven Borrowings of BA's outstanding at any time.  To make any such
election, Canadian Revolver Borrower must give to Canadian Administration Agent
written notice (or telephonic notice promptly confirmed in writing) of any such
Conversion or Continuation of existing Canadian Revolver Advances, with a
separate notice given for each new Borrowing.  Each such notice constitutes a
"Continuation/Conversion Notice" hereunder and must:

          (a)  specify the existing Canadian Revolver Advances which are to be
     Continued or Converted;

          (b)  specify (i) the aggregate amount of any Borrowing of Canadian
     Revolver Prime Rate Loans into which such existing Canadian Revolver
     Advances are to be Continued or Converted and the date on which such
     Continuation or Conversion is to occur, or (ii) the amount of any Borrowing
     of Bankers' Acceptances into which such existing Canadian Revolver Advances
     are to be Continued or Converted, the date on which such Continuation or
     Conversion is to occur, and the maturity of such Bankers' Acceptances; and

                                      43
<PAGE>

          (c)  be received by Canadian Administration Agent not later than 10:00
     a.m., Toronto, Ontario time, on (i) the day on which any such Continuation
     or Conversion to Canadian Revolver Prime Rate Loans is to occur, or (ii) on
     the third Business Day preceding the day on which any such Continuation or
     Conversion to Bankers' Acceptances is to occur.

Each such written request or confirmation must be made in the form and substance
of the "Continuation/Conversion Notice" attached hereto as Exhibit B-2, duly
completed.  Each such telephonic request shall be deemed a representation,
warranty, acknowledgment and agreement by Canadian Revolver Borrower as to the
matters which are required to be set out in such written confirmation.  Upon
receipt of any such Continuation/Conversion Notice, Canadian Revolver Agent
shall give each Canadian Revolver Lender prompt notice of the terms thereof.
Each Continuation/Conversion Notice shall be irrevocable and binding on Canadian
Revolver Borrower.  During the continuance of any Default, Canadian Revolver
Borrower may not make any election to Convert existing Canadian Revolver
Advances into Bankers' Acceptances or to rollover existing Bankers' Acceptances
into new Bankers' Acceptances.  If (due to the existence of a Default or for any
other reason) Canadian Revolver Borrower fails to timely and properly give any
Continuation/Conversion Notice with respect to a Borrowing of existing Bankers'
Acceptances at least three days prior to the maturity of the Bankers'
Acceptance, such Bankers' Acceptances, to the extent not prepaid at the end of
such Interest Period, shall automatically be Converted into Canadian Revolver
Prime Rate Loans at the end of such Interest Period.   No new funds shall be
repaid by Canadian Revolver Borrower or advanced by any Canadian Revolver Lender
in connection with any Continuation or Conversion of existing Canadian Revolver
Advances pursuant to this section, and no such Continuation or Conversion shall
be deemed to be a new advance of funds for any purpose; such Continuations and
Conversions merely constitute a change in the interest rate applicable to
already outstanding Loans.

     Section 2B.4.  Repayments of Canadian Revolver Loans.
                    -------------------------------------

     (a)  Mandatory Prepayments.  Except to the extent permitted by Section
          ---------------------
2B.4(c), if the aggregate principal amount of the outstanding Canadian Revolver
Facility Usage ever exceeds the Canadian Revolver Commitment, Canadian Revolver
Borrower shall immediately on demand prepay the principal of the Canadian
Revolver Advances in an amount at least equal to such excess.  Each prepayment
of principal under this section shall be accompanied by all interest then
accrued and unpaid on the principal so prepaid.  Any principal or interest
prepaid pursuant to this section shall be in addition to, and not in lieu of,
all payments otherwise required to be paid under the Loan Documents at the time
of such prepayment. No BA may be prepaid as a result of the operation of this
Section 2B.4(b); provided, however, that any such excess required to be paid
under this Section 2B.4(b) and not otherwise applicable to Canadian Revolver
Loans will be paid to Canadian Administration Agent and held in accordance with
Section 2B.11.

     (b)  Currency Fluctuations.  Notwithstanding any other provision of this
          ---------------------
Agreement, Canadian Administration Agent shall have the right to calculate the
outstanding Canadian Revolver Facility Usage for all purposes including making a
determination from time to time of the available undrawn portion of the Canadian
Revolver Commitment.  If following such

                                      44
<PAGE>

calculation, Canadian Administration Agent determines that the Canadian Revolver
Facility Usage is greater than 105% of the Canadian Revolver Commitment, then
Canadian Administration Agent shall so advise Canadian Revolver Borrower and
Canadian Revolver Borrower shall repay, on the earlier of five Business Days
after such advice and the next applicable Interest Payment Date immediately
following such advice, an amount sufficient to eliminate such excess, together
with all accrued interest on the amount so paid. No BA may be prepaid as a
result of the operation of this Section 2B.4(c); provided, however, that any
such excess required to be paid under this Section 2B.4(c) and not otherwise
applicable to Canadian Revolver Loans will be paid to Canadian Administration
Agent and held in accordance with Section 2B.11.

     (c)  Optional Prepayments.  Canadian Revolver Borrower may, upon five
          --------------------
Business Days' notice to Canadian Administration Agent (and Canadian
Administration Agent will promptly give notice to the other Canadian Revolver
Lenders) from time to time and without premium or penalty prepay the Canadian
Revolver Loans, in whole or in part, so long as the aggregate amounts of all
partial prepayments of principal on the Canadian Revolver Loans equals C$100,000
or any higher integral multiple of C$100,000.  Each prepayment of principal
under this section shall be accompanied by all interest then accrued and unpaid
on the principal so prepaid.  Any principal or interest prepaid pursuant to this
section shall be in addition to, and not in lieu of, all payments otherwise
required to be paid under the Loan Documents at the time of such prepayment.  No
BA may be prepaid hereunder except in accordance with Section 2B.11.

     Section 2B.5.  Interest Rates and Fees.
                    -----------------------

     (a)  Interest Rates.  Each Canadian Revolver Loan shall bear interest as
          --------------
follows:  (i) unless the Default Rate shall apply, each Canadian Revolver Prime
Rate Loan shall bear interest on each day outstanding at the Canadian Revolver
Prime Rate plus the Canadian Revolver Prime Rate Margin in effect on such day,
and (ii) during a Default Rate Period, all Canadian Revolver Loans shall bear
interest on each day outstanding at the applicable Default Rate.  If an Event of
Default based upon Section 8.1(a), Section 8.1(b) or, with respect to Canadian
Revolver Borrower, based upon Section 8.1(i)(i), (i)(ii) or (i)(iii) exists and
the Canadian Revolver Loans are not bearing interest at the Default Rate, the
past due principal and past due interest shall bear interest on each day
outstanding at the applicable Default Rate.  The interest rate shall change
whenever the applicable Canadian Revolver Prime Rate or the Canadian Revolver
Prime Rate Margin changes.  In no event shall the interest rate on any Canadian
Revolver Loan exceed the such rates as set out in or calculated pursuant to
Section 10.10.

     (b)  Commitment Fees.  In consideration of each Canadian Revolver Lender's
          ---------------
commitment to make Canadian Revolver Advances, Canadian Revolver Borrower will
pay to Canadian Administration Agent for the account of each Canadian Revolver
Lender a commitment fee determined on a daily basis equal to the Canadian
Revolver Commitment Fee Rate in effect on such day times such Canadian Revolver
Lender's Percentage Share of the unused portion of the Canadian Revolver
Commitment on each day during the Canadian Commitment Period, determined for
each such day by deducting from the amount of the Canadian Revolver Commitment
at the end of such day the Canadian Revolver Facility Usage.

                                      45
<PAGE>

This commitment fee shall be due and payable in arrears on the last day of each
Fiscal Quarter and at the end of the Canadian Commitment Period. Canadian
Revolver Borrower shall have the right from time to time to permanently reduce
the Canadian Revolver Commitment, provided that (i) notice of such reduction is
given not less than 2 Business Days prior to such reduction, (ii) the resulting
Canadian Revolver Commitment is not less than the Canadian Revolver Facility
Usage and (iii) each partial reduction shall be in an amount at least equal to
C$500,000 and in multiples of C$100,000 in excess thereof.

     (c)  Stamping Fees.  In consideration of each Canadian Revolver Lender's
          -------------
commitment to accept or participate in Bankers' Acceptances under this
Agreement, Canadian Revolver Borrower will pay to Canadian Administration Agent
for the account of such Canadian Revolver Lender the Stamping Fee Rate
multiplied by the face amount of each Bankers' Acceptance accepted by such
Canadian Revolver Lender under this Agreement calculated for the number of days
in the term of such Bankers' Acceptance.  Such fee shall be due and payable on
the date on which such Bankers' Acceptances are accepted and shall be deducted
from the Discount Proceeds paid to Canadian Revolver Borrower.  Such fee shall
be non-refundable, notwithstanding any reduction in the Stamping Fee Rate during
the term of such Bankers' Acceptances.

     (d)  Canadian Administration Agent's Fees. In addition to all other amounts
          ------------------------------------
due to Canadian Administration Agent under the Loan Documents, Canadian Revolver
Borrower will pay fees to Canadian Administration Agent as described in the
agency fee agreement between Canadian Administration Agent and Canadian Revolver
Borrower.

     Section 2B.6.  Use of Proceeds.  Canadian Revolver Borrower shall use all
                    ---------------
Canadian Revolver Advances (i) to finance its capital expenditures, (ii to pay
reimbursement obligations of Canadian Letters of Credit, and (ii to provide
working capital for operations and for other general business purposes.
Canadian Revolver Borrower shall use all Canadian Letters of Credit for its and
its Subsidiaries' general corporate purposes (but not to pay distributions to
partners of Restricted Persons), including in relation to the purchase or
exchange by Canadian Revolver Borrower of Petroleum Products.  In no event shall
the funds from any Canadian Revolver Loan, or any Canadian Letter of Credit, or
any Banker's Acceptance be used directly or indirectly by any Person for
personal, family, household or agricultural purposes or for the purpose, whether
immediate, incidental or ultimate, of purchasing, acquiring or carrying any
"margin stock" (as such term is defined in Regulation U promulgated by the Board
of Governors of the Federal Reserve System) or to extend credit to others
directly or indirectly for the purpose of purchasing or carrying any such margin
stock.  Canadian Revolver Borrower represents and warrants that it is not
engaged principally, or as one of its important activities, in the business of
extending credit to others for the purpose of purchasing or carrying such margin
stock.

     Section 2B.7.  Creation of Bankers' Acceptances.  Upon receipt of a
                    --------------------------------
Borrowing Notice requesting a Borrowing by way of Bankers' Acceptances, and
subject to the provisions of this Agreement, each Canadian Revolver Lender shall
accept, in accordance with its Percentage Share of the requested Borrowing from
time to time such Bankers' Acceptances as Canadian Revolver Borrower shall
request provided that:

                                      46
<PAGE>

          (a)  Bankers' Acceptances shall be issued on a Business Day;

          (b)  each Bankers' Acceptance shall have a term of one, two, three or
     six months (excluding days of grace), as selected by Canadian Revolver
     Borrower in the relevant Borrowing Notice provided that each Bankers'
     Acceptance shall mature on a Business Day;

          (c)  the face amount of each Bankers' Acceptance shall be not less
     than C$500,000 and in multiples of C$100,000 for any amounts in excess
     thereof; and

          (d)  each Bankers' Acceptance shall be in a form acceptable to the
     Canadian Administration Agent.

     Section 2B.8.  Terms of Acceptance by the Canadian Revolver Lenders.
                    ----------------------------------------------------

     (a)  Delivery and Payment.  Subject to Sections 2B.3 and 2B.4 and only if a
          --------------------
valid appointment pursuant to Section 2B.8(d) is not in place, Canadian Revolver
Borrower shall pre-sign and deliver to each Canadian Revolver Lender bankers'
acceptance drafts in sufficient quantity to meet Canadian Revolver Borrower's
requirements for anticipated Borrowings by way of Bankers' Acceptances.
Canadian Revolver Borrower shall, at its option, provide for payment to Canadian
Administration Agent for the benefit of Canadian Revolver Lenders of each
Bankers' Acceptance on the date on which a Bankers' Acceptance matures, either
by payment of the full face amount thereof or through utilization of a
Conversion to another Type of Borrowing in accordance with this Agreement, or
through a combination thereof.  Canadian Revolver Borrower waives presentment
for payment of Bankers' Acceptances by Canadian Revolver Lenders and shall not
claim from Canadian Revolver Lenders any days of grace for the payment at
maturity of Bankers' Acceptances.  Any amount owing by Canadian Revolver
Borrower in respect of any Bankers' Acceptance which is not paid in accordance
with the foregoing, shall, as and from the date on which such Bankers'
Acceptance matures, be deemed to be outstanding hereunder as a Canadian Revolver
Prime Rate Loan.

     (b)  No Liability.  Canadian Administration Agent and Canadian Revolver
          ------------
Lenders shall not be liable for any damage, loss or improper use of any bankers'
acceptance draft endorsed in blank except for any loss arising by reason of
Canadian Administration Agent or a Canadian Revolver Lender failing to use the
same standard of care in the custody of such bankers' acceptance drafts as
Canadian Administration Agent or such Canadian Revolver Lender use in the
custody of their own property of a similar nature.

     (c)  Bankers' Acceptances Purchased by Canadian Revolver Lenders.  Each
          -----------------------------------------------------------
Canadian Revolver Lender shall purchase Bankers' Acceptances accepted by it for
an amount equal to the Discount Proceeds.

     (d)  Power of Attorney.  To facilitate the procedures contemplated in this
          -----------------
Agreement, Canadian Revolver Borrower appoints each Canadian Revolver Lender
from time to time as the attorney-in-fact of Canadian Revolver Borrower to
execute, endorse and deliver on behalf of

                                      47
<PAGE>

Canadian Revolver Borrower drafts or depository bills in the form or forms
prescribed by such Canadian Revolver Lender for Bankers' Acceptances denominated
in Canadian Dollars. Each Bankers' Acceptance executed and delivered by a
Canadian Revolver Lender on behalf of Canadian Revolver Borrower shall be as
binding upon such Canadian Revolver Borrower as if it had been executed and
delivered by a duly authorized officer of such Canadian Revolver Borrower. The
foregoing appointment shall cease to be effective, in respect of any Canadian
Revolver Lender regarding Canadian Revolver Borrower, three Business Days
following receipt by such Canadian Revolver Lender of a written notice from
Canadian Revolver Borrower revoking such appointment (which notice shall be
copied to the Canadian Administration Agent); provided that any such revocation
shall not affect Bankers' Acceptances previously executed and delivered by such
Canadian Revolver Lender pursuant to such appointment.

     (e)  Pro-Rata Treatment of Canadian Revolver Advances.
          ------------------------------------------------

          (i)  Each Canadian Revolver Advance shall be made available by each
     Canadian Revolver Lender and all repayments and reductions in respect
     thereof shall be made and applied in a manner so that the Canadian Revolver
     Advances outstanding hereunder to each Canadian Revolver Lender will, to
     the extent possible, thereafter be pro rata in accordance with such
     Canadian Revolver Lender's Percentage Share.  The Canadian Administration
     Agent is authorized by Canadian Revolver Borrower and each Canadian
     Revolver Lender to determine, in its sole and unfettered discretion, the
     portion of each Canadian Revolver Advance and each Type of Canadian
     Revolver Advance to be made available by each Canadian Revolver Lender and
     the application of repayments and reductions of Canadian Revolver Advances
     to give effect to the provisions of this Section, provided that no Canadian
     Revolver Lender shall, as a result of any such determination, have a
     Percentage Share of the Canadian Revolver Advances which is in excess of
     its Percentage Share of the Canadian Revolver Commitment.

          (ii) In the event it is not practicable to allocate Bankers'
     Acceptances to each Canadian Revolver Lender such that the aggregate amount
     of Bankers' Acceptances required to be purchased by such Canadian Revolver
     Lender hereunder is in a whole multiple of C$100,000, the Canadian
     Administration Agent is authorized by each Canadian Borrower and each
     Canadian Revolver Lender to make such allocation as the Canadian
     Administration Agent determines in its sole and unfettered discretion may
     be equitable in the circumstances and, if the aggregate amount of such
     Bankers' Acceptances is not a whole multiple of C$100,000, then the
     Canadian Administration Agent may allocate (on a basis considered by it to
     be equitable) the excess of such Canadian Revolver Advance over the next
     lowest whole multiple of C$100,000 to one Canadian Revolver Lender, which
     shall purchase a Bankers' Acceptance with a face amount equal to the excess
     and having the same term as the corresponding Bankers' Acceptances.  In no
     event shall the portion of the outstanding Borrowings by way of Bankers'
     Acceptances of a Canadian Revolver Lender exceed such Canadian Revolver
     Lenders' Percentage Share of the aggregate Borrowings by way of Bankers'
     Acceptances by more than C$100,000 as a result of such exercise of
     discretion by the Canadian Administration Agent.

                                      48
<PAGE>

     (f)  BA Equivalent Advances.  Each Canadian Revolver Lender may, in lieu of
          ----------------------
accepting a BA on the date of any Borrowing, make a BA Equivalent Advance.  The
amount of each BA Equivalent Advance shall be equal to the Discount Proceeds
(with reference to the applicable BA Discount Rate) which would be realized from
a hypothetical sale of those BAs which, but for this subsection, would have been
sold to such Canadian Revolver Lender.  If such Canadian Revolver Lender does
not otherwise have a BA Discount Rate applicable to it, the applicable BA
Discount Rate will be calculated as though such Canadian Revolver Lender was
listed on Schedule II of the Bank Act (Canada).  Any BA Equivalent Advance shall
be made on the relevant date of any Borrowing, and shall remain outstanding for
the term of the corresponding BA.  On the maturity date of the corresponding BA,
such BA Equivalent Advance shall be repaid in an amount equal to the face amount
of a draft that would have been accepted by such Canadian Revolver Lender if
such Canadian Revolver Lender had accepted and purchase a BA hereunder.  Each BA
Equivalent Advance made pursuant to this subsection shall be deemed to be a BA
accepted and purchased by such Canadian Revolver Lender pursuant to the terms
hereof, and except in this subsection, any reference to a BA shall include such
BA Equivalent Advance.

     Section 2B.9.  General Procedures for Bankers' Acceptances.
                    -------------------------------------------

     (a)  Continuations.  In the case of a Continuation of maturing Bankers'
          -------------
Acceptances, each Canadian Revolver Lender in order to satisfy the continuing
liability of Canadian Revolver Borrower to the Canadian Revolver Lender for the
face amount of the maturing Bankers' Acceptances, shall retain for its own
account the Net Proceeds of each new Bankers' Acceptance issued by it in
connection with such Continuation; and Canadian Revolver Borrower shall, on the
maturity date of the maturing Bankers' Acceptances, pay to Canadian
Administration Agent for the benefit of Canadian Revolver Lenders an amount
equal to the difference between the face amount of the maturing Bankers'
Acceptances and the aggregate Net Proceeds of the new Bankers' Acceptances.

     (b)  Conversion from Canadian Revolver Prime Rate Loans.  In the case of a
          --------------------------------------------------
Conversion from a Borrowing of Canadian Revolver Prime Rate Loans into a
Borrowing by way of Bankers' Acceptances to be accepted by a Canadian Revolver
Lender pursuant to Sections 2B.1, 2B.2 and 2B.3, such Canadian Revolver Lender,
in order to satisfy the continuing liability of Canadian Revolver Borrower to it
for the principal amount of the Canadian Revolver Prime Rate Loans being
converted, shall retain for its own account the Discount Proceeds of each new
Bankers' Acceptance issued by it in connection with such Conversion; and
Canadian Revolver Borrower shall, on the date of issuance of the Bankers'
Acceptances, pay to Canadian Administration Agent for the benefit of Canadian
Revolver Lenders an amount equal to the difference between the aggregate
principal amount of the Canadian Revolver Prime Rate Loans being converted owing
to the Canadian Revolver Lenders and the aggregate Discount Proceeds of such
Bankers' Acceptances.

     (c)  Authorization.  Canadian Revolver Borrower hereby authorizes each
          -------------
Canadian Revolver Lender to complete, stamp, hold, sell, rediscount or otherwise
dispose of all Bankers'

                                      49
<PAGE>

Acceptances accepted by it pursuant to this Section in accordance with the
instructions provided by Canadian Revolver Borrower pursuant to Section 2B.3, as
applicable.

     (d)  Depository Notes.  The parties agree that in the administering of
          ----------------
Bankers' Acceptances, each Canadian Revolver Lender may avail itself of the debt
clearing services offered by a clearing house for depository notes pursuant to
the Depository Bills and Notes Act (Canada) and that the procedures set forth in
Article II be deemed amended to the extent necessary to comply with the
requirements of such debt clearing services.

     Section 2B.10.  Execution of Bankers' Acceptances.  The signatures of any
                     ---------------------------------
authorized signatory on Bankers' Acceptances which are authorized and requested
hereunder by the Canadian Revolver Borrower may, at the option of Canadian
Revolver Borrower, be reproduced in facsimile and such Bankers' Acceptances
bearing such facsimile signatures shall be binding on Canadian Revolver Borrower
as if they had been manually signed by such authorized signatory.
Notwithstanding that any person whose signature appears on any Bankers'
Acceptance as a signatory may no longer be an authorized signatory of Canadian
Revolver Borrower at the date of issuance of a Bankers' Acceptance, and
notwithstanding that the signature affixed may be a reproduction only, such
signature shall, unless prior to its use the Canadian Revolver Borrower has
notified the Canadian Administration Agent in writing to contrary, nevertheless
be valid and sufficient for all purposes as if such authority had remained in
force at the time of such issuance and as if such signature had been manually
applied, and any such Bankers' Acceptance so signed shall be binding on Canadian
Revolver Borrower.

     Section 2B.11.  Escrowed Funds.  Upon the occurrence of an Event of
                     --------------
Default and an acceleration of the Obligations under Section 8.1, or if, after
the making of a prepayment as permitted or required under Section 2B.4, the
outstanding Bankers' Acceptances will exceed the Canadian Revolver Commitment,
Canadian Revolver Borrower shall forthwith pay to Canadian Administration Agent
for deposit into an escrow account maintained by and in the name of Canadian
Administration Agent for the benefit of Canadian Revolver Lenders in accordance
with their Percentage Shares an amount equal to the Canadian Revolver Lenders'
maximum potential liability (as determined by Canadian Administration Agent)
under then outstanding Bankers' Acceptances or the amount by which the then
outstanding Bankers' Acceptances exceed the Canadian Revolver Commitment, as the
case may be (the "Escrow Funds").  The Escrow Funds shall be held by Canadian
                  ------------
Administration Agent for set-off against such outstanding Bankers' Acceptances
or such excess, as the case may be, or future Canadian Obligations, and pending
such application shall bear interest at the rate declared by Canadian
Administration Agent from time to time as that payable by it in respect of
deposits for such amount and for such period relative to the maturity date of
such Bankers' Acceptances, as applicable.  If such Event of Default is either
waived or cured in compliance with the terms of this Agreement, or the
outstanding Bankers' Acceptances no longer exceed the Canadian Revolver
Commitment, as the case may be, then the Escrow Funds, together with any accrued
interest to the date of release, shall be forthwith released to Canadian
Revolver Borrower.

     Section 2B.12.  Canadian Letters of Credit.  Subject to the terms and
                     --------------------------
conditions hereof, Canadian Revolver Borrower may during the Canadian Revolving
Period request Canadian LC

                                      50
<PAGE>

Issuer to issue, amend, or extend the expiration date of, one or more Canadian
Letters of Credit denominated in either Canadian Dollars or Dollars, provided
that, after taking such Canadian Letter of Credit into account:

          (a)  the Canadian Facility Usage does not exceed the Canadian Revolver
     Commitment at such time;

          (b)  the aggregate amount of Canadian LC Obligations at such time does
     not exceed the Dollar Equivalent of $5,000,000;

          (c)  the expiration date of such Canadian Letter of Credit is prior to
     the earlier of (i) one (1) year after the date of issuance of such Canadian
     Letter of Credit or (ii) the end of the Canadian Commitment Period;

          (d)  such Canadian Letter of Credit is to be used for general
     corporate purposes of Canadian Revolver Borrower or any of its Subsidiaries
     and is not directly or indirectly used to assure payment of or otherwise
     support any Indebtedness of any Person, except Indebtedness of a Restricted
     Person;

          (e)  the issuance of such Canadian Letter of Credit will be in
     compliance with all applicable governmental restrictions, policies, and
     guidelines and will not subject Canadian LC Issuer to any cost which is not
     reimbursable under Article III;

          (f)  the form and terms of such Canadian Letter of Credit are
     acceptable to Canadian LC Issuer in its sole and absolute discretion; and

          (g)  all other conditions in this Agreement to the issuance of such
     Canadian Letter of Credit have been satisfied.

Canadian LC Issuer will honor any such request if the foregoing conditions (a)
through (g) (in the following Section 2B.13 called the "Canadian LC Conditions")
                                                        ----------------------
have been met as of the date of issuance, amendment, or extension of the
expiration, of such Canadian Letter of Credit.

     Section 2B.13.  Requesting Canadian Letters of Credit.  Canadian Revolver
                     -------------------------------------
Borrower must make written application for any Canadian Letter of Credit at
least two Business Days before the date on which Canadian Revolver Borrower
desires for Canadian LC Issuer to issue such Canadian Letter of Credit.  By
making any such written application, unless otherwise expressly stated therein,
Canadian Revolver Borrower shall be deemed to have represented and warranted
that the Canadian LC Conditions described in Section 2B.12 will be met as of the
date of issuance of such Canadian Letter of Credit.  Each such written
application for a Canadian Letter of Credit must be made in writing in the form
and substance of Exhibit G-2, the terms and provisions of which are hereby
incorporated herein by reference (or in such other form as may mutually be
agreed upon by Canadian LC Issuer and Canadian Revolver Borrower).  If all
Canadian LC Conditions for a Canadian Letter of Credit have been met as
described in Section 2B.12 on any Business Day before 11:00 a.m., Toronto,
Ontario time, Canadian LC Issuer will

                                      51
<PAGE>

issue such Canadian Letter of Credit on the same Business Day at Canadian LC
Issuer's office in Toronto, Ontario. If the Canadian LC Conditions are met as
described in Section 2B.12 on any Business Day on or after 11:00 a.m., Toronto,
Ontario time, Canadian LC Issuer will issue such Canadian Letter of Credit on
the next succeeding Business Day at Canadian LC Issuer's office in Toronto,
Ontario. If any provisions of any Canadian LC Application conflict with any
provisions of this Agreement, the provisions of this Agreement shall govern and
control.

     Section 2B.14.  Reimbursement and Participations.
                     --------------------------------

     (a)  Reimbursement by Canadian Revolver Borrower.  Each Matured Canadian LC
          -------------------------------------------
Obligation shall constitute a loan by Canadian LC Issuer to Canadian Revolver
Borrower. Canadian Revolver Borrower promises to pay to Canadian LC Issuer, or
to Canadian LC Issuer's order, on demand, the full amount of each Matured
Canadian LC Obligation, together with interest thereon  (i) at the Canadian
Revolver Prime Rate to and including the second Business Day after the Matured
Canadian LC Obligation is incurred and (ii) at the  Default Rate on each day
thereafter.

     (b)  Canadian Letter of Credit Advances. If the beneficiary of any Canadian
          ----------------------------------
Letter of Credit makes a draft or other demand for payment thereunder then
Canadian Revolver Borrower may, during the interval between the making thereof
and the honoring thereof by Canadian LC Issuer, request Canadian Revolver
Lenders to make Canadian Revolver Loans to Canadian Revolver Borrower in the
amount of such draft or demand, which Canadian Revolver Loans shall be made
concurrently with Canadian LC Issuer's payment of such draft or demand and shall
be immediately used by Canadian LC Issuer to repay the amount of the resulting
Matured Canadian LC Obligation.  Such a request by Canadian Revolver Borrower
shall be made in compliance with all of the provisions hereof, provided that for
the purposes of the first sentence of Section 2B.1, the amount of such Canadian
Revolver Loans shall be considered, but the amount of the Matured Canadian LC
Obligation to be concurrently paid by such Canadian Revolver Loans shall not be
considered.

     (c)  Participation by Canadian Lenders.  Canadian LC Issuer irrevocably
          ---------------------------------
agrees to grant and hereby grants to each Canadian Revolver Lender, and -- to
induce Canadian LC Issuer to issue Canadian Letters of Credit hereunder -- each
Canadian Revolver Lender irrevocably agrees to accept and purchase and hereby
accepts and purchases from Canadian LC Issuer, on the terms and conditions
hereinafter stated and for such Canadian Revolver Lender's own account and risk
an undivided interest equal to such Canadian Revolver Lender's Percentage Share
of Canadian LC Issuer's obligations and rights under each Canadian Letter of
Credit issued hereunder and the amount of each Matured Canadian LC Obligation
paid by Canadian LC Issuer thereunder.  Each Canadian Revolver Lender
unconditionally and irrevocably agrees with Canadian LC Issuer that, if a
Matured Canadian LC Obligation is paid under any Canadian Letter of Credit for
which Canadian LC Issuer is not reimbursed in full by Canadian Revolver Borrower
in accordance with the terms of this Agreement and the related Canadian LC
Application (including any reimbursement by means of concurrent Canadian
Revolver Loans or by the application of Canadian LC Collateral), such Canadian
Revolver Lender shall (in all circumstances and without set-off or counterclaim)
pay to Canadian LC Issuer on demand, in

                                      52
<PAGE>

immediately available funds at Canadian LC Issuer's address for notices
hereunder, such Canadian Revolver Lender's Percentage Share of such Matured
Canadian LC Obligation (or any portion thereof which has not been reimbursed by
Canadian Revolver Borrower). Each Canadian Revolver Lender's obligation to pay
Canadian LC Issuer pursuant to the terms of this subsection is irrevocable and
unconditional. If any amount required to be paid by any Canadian Revolver Lender
to Canadian LC Issuer pursuant to this subsection is paid by such Canadian
Revolver Lender to Canadian LC Issuer within three Business Days after the date
such payment is due, Canadian LC Issuer shall in addition to such amount be
entitled to recover from such Canadian Revolver Lender, on demand, interest
thereon calculated from such due date at the "Bank Rate" as set by the Bank of
Canada, as quoted on Reuters page BOCFAD. If any amount required to be paid by
any Canadian Revolver Lender to Canadian LC Issuer pursuant to this subsection
is not paid by such Canadian Revolver Lender to Canadian LC Issuer within three
Business Days after the date such payment is due, Canadian LC Issuer shall in
addition to such amount be entitled to recover from such Canadian Revolver
Lender, on demand, interest thereon calculated from such due date at the
Canadian Revolver Prime Rate.

     (d)  Distributions to Participants.  Whenever Canadian LC Issuer has in
          -----------------------------
accordance with this section received from any Canadian Revolver Lender payment
of such Canadian Revolver Lender's Percentage Share of any Matured Canadian LC
Obligation, if Canadian LC Issuer thereafter receives any payment of such
Matured Canadian LC Obligation or any payment of interest thereon (whether
directly from Canadian Revolver Borrower or by application of Canadian LC
Collateral or otherwise, and excluding only interest for any period prior to
Canadian LC Issuer's demand that such Canadian Revolver Lender make such payment
of its Percentage Share), Canadian LC Issuer will distribute to such Canadian
Revolver Lender its Percentage Share of the amounts so received by Canadian LC
Issuer; provided, however, that if any such payment received by Canadian LC
        --------  -------
Issuer must thereafter be returned by Canadian LC Issuer, such Canadian Revolver
Lender shall return to Canadian LC Issuer the portion thereof which Canadian LC
Issuer has previously distributed to it.

     (e)  Calculations.  A written advice setting forth in reasonable detail the
          ------------
amounts owing under this section, submitted by Canadian LC Issuer to Canadian
Revolver Borrower or any Canadian Revolver Lender from time to time, shall be
conclusive, absent manifest error, as to the amounts thereof.

     Section 2B.15.  Canadian Letter of Credit Fees.  In consideration of
                     ------------------------------
Canadian LC Issuer's issuance of any Canadian Letter of Credit, Canadian
Revolver Borrower agrees to pay (i) to Canadian Administration Agent for the
account of each Canadian Revolver Lender in proportion to its Percentage Share,
a Canadian Letter of Credit fee equal to the Canadian Letter of Credit Fee Rate
applicable each day times the face amount of such Canadian Letter of Credit and
(ii) to such Canadian LC Issuer for its own account, a letter of credit fronting
fee at a rate equal to one-eighth percent (.125%) per annum times the face
amount of such Canadian Letter of Credit. Each such fee will be calculated on
the face amount of each Canadian Letter of Credit outstanding on each day at the
above applicable rates and will be payable quarterly in arrears on the last day
of each March, June, September and December.  In addition, Canadian Revolver
Borrower will pay to Canadian LC Issuer a minimum administrative issuance fee
and such other

                                      53
<PAGE>

fees and charges customarily charged by the Canadian LC Issuer in respect of any
issuance, amendment or negotiation of any Canadian Letter of Credit in
accordance with the Canadian LC Issuer's published schedule of such charges
effective as of the date of such amendment or negotiation.

     Section 2B.16.  No Duty to Inquire.
                     ------------------

     (a)  Drafts and Demands. Canadian LC Issuer is authorized and instructed to
          ------------------
accept and pay drafts and demands for payment under any Canadian Letter of
Credit without requiring, and without responsibility for, any determination as
to the existence of any event giving rise to said draft, either at the time of
acceptance or payment or thereafter. Canadian LC Issuer is under no duty to
determine the proper identity of anyone presenting such a draft or making such a
demand (whether by tested telex or otherwise) as the officer, representative or
agent of any beneficiary under any Canadian Letter of Credit, and payment by
Canadian LC Issuer to any such beneficiary when requested by any such purported
officer, representative or agent is hereby authorized and approved. Canadian
Revolver Borrower releases each Lender Party from, and agrees to hold each
Lender Party harmless and indemnified against, any liability or claim in
connection with or arising out of the subject matter of this section, which
indemnity shall apply whether or not any such liability or claim is in any way
or to any extent caused, in whole or in part, by any negligent act or omission
of any kind by any Lender Party, provided only that no Lender Party shall be
entitled to indemnification for that portion, if any, of any liability or claim
which is proximately caused by its own individual gross negligence or willful
misconduct, as determined in a final judgment.

     (b)  Extension of Maturity.  If the maturity of any Canadian Letter of
          ---------------------
Credit is extended by its terms or by Law or governmental action, if any
extension of the maturity or time for presentation of drafts or any other
modification of the terms of any Canadian Letter of Credit is made at the
request of any Restricted Person, or if the amount of any Canadian Letter of
Credit is increased at the request of any Restricted Person, this Agreement
shall be binding upon all Restricted Persons with respect to such Canadian
Letter of Credit as so extended, increased or otherwise modified, with respect
to drafts and property covered thereby, and with respect to any action taken by
Canadian LC Issuer, Canadian LC Issuer's correspondents, or any Canadian
Revolver Lender in accordance with such extension, increase or other
modification.

     (c)  Transferees of Canadian Letters of Credit.  If any Canadian Letter of
          -----------------------------------------
Credit provides that it is transferable, Canadian LC Issuer shall have no duty
to determine the proper identity of anyone appearing as transferee of such
Canadian Letter of Credit, nor shall Canadian LC Issuer be charged with
responsibility of any nature or character for the validity or correctness of any
transfer or successive transfers, and payment by Canadian LC Issuer to any
purported transferee or transferees as determined by Canadian LC Issuer is
hereby authorized and approved, and Canadian Revolver Borrower releases each
Lender Party from, and agrees to hold each Lender Party harmless and indemnified
against, any liability or claim in connection with or arising out of the
foregoing, which indemnity shall apply whether or not any such liability or
claim is in any way or to any extent caused, in whole or in part, by any
negligent act or omission of any kind by any Lender Party,

                                      54
<PAGE>

provided only that no Lender Party shall be entitled to indemnification for that
portion, if any, of any liability or claim which is proximately caused by its
own individual gross negligence or willful misconduct, as determined in a final
judgment.

     Section 2B.17.  Canadian LC Collateral.
                     ----------------------

     (a)  Canadian LC Obligations in Excess of Canadian Revolver Commitment. If,
          -----------------------------------------------------------------
after the making of all mandatory prepayments required under Section 2B.4(c),
the outstanding Canadian LC Obligations will exceed the Canadian Revolver
Commitment, then in addition to prepayment of the entire principal balance of
the Canadian Revolver Loans, Canadian Revolver Borrower will immediately pay to
Canadian LC Issuer an amount equal to such excess. Canadian LC Issuer will hold
such amount as collateral security for the remaining Canadian LC Obligations
(all such amounts held as collateral security for Canadian LC Obligations being
herein collectively called "Canadian LC Collateral") and the other Obligations,
                            ----------------------
and such collateral may be applied from time to time to any Matured Canadian LC
Obligations or other Obligations which are due and payable.  Neither this
subsection nor the following subsection shall, however, limit or impair any
rights which Canadian LC Issuer may have under any other document or agreement
relating to any Canadian Letter of Credit, Canadian LC Collateral or Canadian LC
Obligation, including any LC Application, or any rights which any Canadian
Lender Party may have to otherwise apply any payments by Canadian Revolver
Borrower and any Canadian LC Collateral under Section 3B.1.

     (b)  Acceleration of Canadian LC Obligations.  If the Obligations or any
          ---------------------------------------
part thereof become immediately due and payable pursuant to Section 8.1 then,
unless all Canadian Revolver Lenders otherwise specifically elect to the
contrary (which election may thereafter be retracted by any Canadian Revolver
Lender at any time), all Canadian LC Obligations shall become immediately due
and payable without regard to whether or not actual drawings or payments on the
Canadian Letters of Credit have occurred, and Canadian Revolver Borrower shall
be obligated to pay to Canadian LC Issuer immediately an amount equal to the
aggregate Canadian LC Obligations which are then outstanding to be held as
Canadian LC Collateral.

     (c)  Investment of Canadian LC Collateral. Pending application thereof, all
          ------------------------------------
Canadian LC Collateral shall be invested by Canadian LC Issuer in such Cash
Equivalents as Canadian LC Issuer may choose in its sole discretion.  All
interest on (and other proceeds of) such Investments shall be reinvested or
applied to Matured Canadian LC Obligations or other Obligations which are due
and payable.  When all Obligations have been satisfied in full, including all
Canadian LC Obligations, all Canadian Letters of Credit have expired or been
terminated, and all of Canadian Borrowers's reimbursement obligations in
connection therewith have been satisfied in full, Canadian LC Issuer shall
release any remaining Canadian LC Collateral.  Canadian Revolver Borrower hereby
assigns and grants to Canadian LC Issuer for the benefit of Canadian Revolver
Lenders a continuing security interest in all Canadian LC Collateral paid by it
to Canadian LC Issuer, all Investments purchased with such Canadian LC
Collateral, and all proceeds thereof to secure its Matured Canadian LC
Obligations and its Obligations under this Agreement, each Canadian Revolver
Note, and the other Loan Documents, and Canadian Revolver Borrower agrees that
such Canadian LC Collateral, Investments and proceeds shall be subject to all of
the

                                      55
<PAGE>

terms and conditions of the Security Documents. Canadian Revolver Borrower
further agrees that Canadian LC Issuer shall have all of the rights and remedies
of a secured party under the Personal Property Security Act (Alberta) with
respect to such security interest and that an Event of Default under this
Agreement shall constitute a default for purposes of such security interest.

     (d)  Payment of Canadian LC Collateral.  When Canadian Revolver Borrower is
          ---------------------------------
required to provide Canadian LC Collateral for any reason and fails to do so on
the day when required, Canadian LC Issuer or Canadian Administration Agent may
without prior notice to Canadian Revolver Borrower or any other Restricted
Person provide such Canadian LC Collateral (whether by application of proceeds
of other Collateral, by transfers from other accounts maintained with Canadian
LC Issuer, or otherwise) using any available funds of Canadian Revolver Borrower
or any other Person also liable to make such payments, and Canadian LC Issuer or
Canadian Administration Agent will give notice thereof to Canadian Revolver
Borrower promptly after such application or transfer.  Any such amounts which
are required to be provided as Canadian LC Collateral and which are not provided
on the date required shall, for purposes of each Security Document, be
considered past due Obligations owing hereunder, and Canadian LC Issuer is
hereby authorized to exercise its respective rights under each Security Document
to obtain such amounts.

     Section 2B.18.  Hedging Contracts.  All Hedging Contracts permitted
                     -----------------
hereunder entered into with any one or more Canadian Revolver Lenders or their
Affiliates shall be deemed to be Obligations and be secured by all Collateral;
subject, however, to the provisions of the Intercreditor Agreement.

                           ARTICLE IIC - Term Loans
                                         ----------

     Section 2C.1. Term Loans.  Subject to the terms and conditions hereof,
                   ----------
each Term Lender agrees to make one (1) advance to Term Borrower (herein called
such Lender's "Term Loan") upon Term Borrower's request on or before May 15,
               ---------
2001, provided that (a) such Term Loan by each Term Lender does not exceed such
Term Lender's Term Loan amount set forth on the Lender Schedule and (b) the
aggregate amount of all Term Loans does not exceed $100,000,000. Portions of
each Term Lender's Term Loan may from time to time be designated as a Term Base
Rate Loan or Term LIBOR Loan as provided herein.  The obligation of Term
Borrower to repay to each Term Lender the amount of the Term Loan made by such
Term Lender to Term Borrower, together with interest accruing in connection
therewith, shall be evidenced by a single promissory note (herein called such
Term Lender's "Term Note") made by Term Borrower payable to the order of such
               ---------
Term Lender in the form of Exhibit A-3 with appropriate insertions. The amount
of principal owing on any Term Lender's Term Note at any given time shall be the
amount of such Term Lender's Term Loan minus all payments of principal
theretofore received by such Term Lender on such Term Note.  Interest on each
Term Note shall accrue and be due and payable as provided herein and therein.
Each Term Note shall be due and payable as provided herein and therein, and
shall be due and payable in full on the Term Loan Maturity Date.  No portion of
any Term Loan which has been repaid may be reborrowed.  Term Borrower may have
no more than three Borrowings of Term LIBOR Loans outstanding at any time.  All

                                      56
<PAGE>

payments of principal and interest on the Term Loans shall be made in Dollars.
All Term Loans shall be advanced to Term Borrower in Dollars.

     Section 2C.2.  Continuations and Conversions of Existing Term Loans.  Term
                    ----------------------------------------------------
Borrower may make the following elections with respect to outstanding Term Loans
(1) to Convert, in whole or part, any Type of Term Loan to any other Type of
Term Loan, provided that any such Conversion of any Term LIBOR Loan must be made
on the last day of the Interest Period applicable thereto; and (2) to Continue,
in whole or in part, Term LIBOR Loans beyond the expiration of such Interest
Period by designating a new Interest Period to take effect at the time of such
expiration.  In making such elections, Term Borrower may combine existing Term
Loans made pursuant to separate Borrowings into one new Borrowing or divide
existing Term Loans made pursuant to one Borrowing into separate new Borrowings,
provided that Term Borrower may have no more than three Borrowings of Term LIBOR
Loans outstanding at any time.  To make any such election, Term Borrower must
give to Administrative Agent written notice (or telephonic notice promptly
confirmed in writing) of any such Conversion or Continuation of existing Term
Loans, with a separate notice given for each new Borrowing.  Each such notice
constitutes a "Continuation/Conversion Notice" hereunder and must:

          (a)  specify the existing Term Loans which are to be Continued or
     Converted;

          (b)  specify (i) the aggregate amount of any Borrowing of Term Base
     Rate Loans into which such existing Term Loans are to be Continued or
     Converted and the date on which such Continuation or Conversion is to
     occur, or (ii) the aggregate amount of any Borrowing of Term LIBOR Loans
     into which such existing Term Loans are to be Continued or Converted, the
     date on which such Continuation or Conversion is to occur (which shall be
     the first day of the Interest Period which is to apply to such Term LIBOR
     Loans), and the length of the applicable Interest Period; and

          (c)  be received by Administrative Agent not later than 11:00 a.m.,
     Boston, Massachusetts time, on (i) the day on which any such Continuation
     or Conversion to Term Base Rate Loans is to occur, or (ii) the third
     Business Day preceding the day on which any such Continuation or Conversion
     to Term LIBOR Loans is to occur.

Each such written request or confirmation must be made in the form and substance
of the "Continuation/Conversion Notice" attached hereto as Exhibit B-3, duly
completed.  Each such telephonic request shall be deemed a representation,
warranty, acknowledgment and agreement by Term Borrower as to the matters which
are required to be set out in such written confirmation. Upon receipt of any
such Continuation/Conversion Notice, Administrative Agent shall give each Term
Lender prompt notice of the terms thereof.  Each Continuation/Conversion Notice
shall be irrevocable and binding on Term Borrower.  During the continuance of
any Default, Term Borrower may not make any election to Convert existing Term
Loans into LIBOR Loans or Continue existing LIBOR Loans made under this
Agreement as LIBOR Loans beyond the last day of the respective and corresponding
Interest Period..  If (due to the existence of a Default or for any other
reason) Term Borrower fails to timely and properly give any
Continuation/Conversion Notice with respect to a Borrowing of existing LIBOR
Loans at least

                                      57
<PAGE>

three days prior to the end of the Interest Period applicable thereto, such
LIBOR Loans (to the extent not prepaid at the end of such Interest Period) shall
automatically be Converted into Term Base Rate Loans at the end of such Interest
Period. No new funds shall be repaid by Term Borrower or advanced by any Term
Lender in connection with any Continuation or Conversion of existing Term Loans
pursuant to this section, and no such Continuation or Conversion shall be deemed
to be a new advance of funds for any purpose; such Continuations and Conversions
merely constitute a change in terms of already outstanding Term Loans and the
interest rate applicable thereto.

     Section 2C.3.  Repayments.
                    ----------

     (a)  Scheduled Repayments of Principal.  Subject to Section 2C.3(b) Term
          ---------------------------------
Borrower shall repay the principal of the Term Loans as follows:   (i) a
principal payment in the amount of $1,000,000 shall be due and payable on May 4,
2002; (ii) a principal payment in the amount of $7,000,000 shall be due and
payable on May 4, 2003; (iii) a principal payment in the amount of $8,000,000
shall be due and payable on each of May 4, 2004 and May 4, 2005; and (iv) the
outstanding principal balance shall be due on the Term Loan Maturity Date.

     (b)  Income Tax Act (Canada).  Except as otherwise provided in Section 8.1,
          -----------------------
notwithstanding anything to the contrary contained herein, in no event shall
Term Borrower be required to repay 25% or more of the principal amount (as
defined in the Income Tax Act (Canada)) of the Term Loans made to it prior to
five years and a day after the date on which the Term Loans are made.

     (c)  Interest Rates.  Each Term Loan shall bear interest as follows: (i)
          --------------
unless the Default Rate shall apply, (A) each Term Base Rate Loan shall bear
interest on each day outstanding at the US Base Rate plus the Term Base Rate
Margin in effect on such day, and (B) each Term LIBOR Loan shall bear interest
on each day during the related Interest Period at the related US LIBOR Rate plus
the Term LIBOR Rate Margin in effect on such day, and (ii) during a Default Rate
Period, all Term Loans shall bear interest on each day outstanding at the
applicable Default Rate.  If an Event of Default based upon Section 8.1(a),
Section 8.1(b) or, with respect to Term Borrower, based upon Section 8.1(i)(i),
(i)(ii) or (i)(iii) exists and the Term Loans are not bearing interest at the
Default Rate, the past due principal and past due interest shall bear interest
on each day outstanding at the applicable Default Rate.  The interest rate shall
change whenever the applicable US Base Rate, the US LIBOR Rate, Term Base Rate
Margin, or the Term LIBOR Rate Margin changes.  In no event shall the interest
rate on any Term Loan exceed the Highest Lawful Rate.

     (d)  Optional Prepayments.  Term Borrower may, upon three Business Days'
          --------------------
notice, as to Term LIBOR Loans, or one Business Day's notice, as to Term Base
Rate Loans, to Administrative Agent (and Administrative Agent will promptly give
notice to the other Term Lenders) from time to time and without premium or
penalty prepay the Term Loans, in whole or in part, so long as the aggregate
amounts of all partial prepayments of principal on the Term Loans equals
$5,000,000 or any higher integral multiple of $1,000,000. Notwithstanding the
foregoing sentence, if Term Borrower shall prepay, in whole or in part, the Term
Loans before

                                      58
<PAGE>

the first anniversary of the initial advance of the Term Loans, voluntarily as
provided in this subsection, Term Borrower shall pay to Administrative Agent for
the account of each Term Lender a prepayment premium (the "Prepayment Premium")
in an amount equal to one percent (1.0%) of the amount of any such prepayment.
Upon receipt of any notice described in the first sentence of this subsection,
Administrative Agent shall give each Term Lender prompt notice of the terms
thereof. Each prepayment of principal of a Term LIBOR Loan under this subsection
shall be accompanied by all interest then accrued and unpaid on the principal so
prepaid. Any principal or interest prepaid pursuant to this subsection shall be
in addition to, and not in lieu of, all payments otherwise required to be paid
under the Loan Documents at the time of such prepayment.

     Section 2C.4.  Use of Proceeds.  Term Borrower shall use all Term Loans to
                    ---------------
finance the Murphy Acquisition.  In no event shall the funds from any Term Loan
be used directly or indirectly by any Person for personal, family, household or
agricultural purposes or for the purpose, whether immediate, incidental or
ultimate, of purchasing, acquiring or carrying any "margin stock" (as such term
is defined in Regulation U promulgated by the Board of Governors of the Federal
Reserve System) or to extend credit to others directly or indirectly for the
purpose of purchasing or carrying any such margin stock.  Term Borrower
represents and warrants that it is not engaged principally, or as one of its
important activities, in the business of extending credit to others for the
purpose of purchasing or carrying such margin stock.

     Section 2C.5.  Hedging Contracts.  All Hedging Contracts permitted
                    -----------------
hereunder entered into with any one or more Term Lenders or their Affiliates
shall be deemed to be Obligations and be secured by all Collateral; subject,
however, to the provisions of the Intercreditor Agreement.

                       ARTICLE III - Payments to Lenders
                                     -------------------

     Section 3.1.  General Procedures.
                   ------------------

     (a)  Each Restricted Person shall pay all amounts owing such Restricted
Person with respect to any US Obligations (whether for principal, interest,
fees, or otherwise) to Administrative Agent for the account of the US Lender
Party to whom such payment is owed in Dollars, without set-off, deduction or
counterclaim, and in immediately available funds and each Restricted Person
shall pay all amounts owing by such Restricted Person with respect to any
Canadian Obligations (whether for principal, interest, fees, or otherwise) to
Canadian Administration Agent for the account of the Canadian Lender Party to
whom such payment is owed in Canadian Dollars (or with respect to Canadian
Revolver Loans funded in Dollars, in Dollars), without set-off, deduction or
counterclaim, and in immediately available funds; provided, however, that all
amounts paid by Administrative Agent on behalf of any Restricted Person in
accordance with Section 6.9 hereof shall be reimbursed to Administrative Agent
by US Borrower in the currency in which such amounts were paid by Administrative
Agent.  If any payment is received on account of any US Obligation in any
currency other than Dollars (whether voluntarily or pursuant to any order or
judgment or the enforcement thereof or the realization of any security or the
liquidation of any Person or otherwise howsoever), such payment shall constitute
a discharge of the liability of a Restricted Person hereunder and under

                                      59
<PAGE>

the other Loan Documents in respect of such US Obligation only to the extent of
the amount of Dollars which the relevant Lender Parties are able to purchase
with the amount of the other currency received by it on the Business Day next
following such receipt by the Administrative Agent in accordance with its normal
procedures and after deducting any premium and costs of exchange. If any payment
is received on account of any Canadian Obligation in any currency other than
Canadian Dollars (whether voluntarily or pursuant to any order or judgment or
the enforcement thereof or the realization of any security or the liquidation of
any Person or otherwise howsoever), such payment shall constitute a discharge of
the liability of a Restricted Person hereunder and under the other Loan
Documents in respect of such Canadian Obligation only to the extent of the
amount of Canadian Dollars which the relevant Lender Parties are able to
purchase with the amount of the other currency received by it on the Business
Day next following such receipt by Canadian Administration Agent in accordance
with its normal procedures and after deducting any premium and costs of
exchange. Each payment under the Loan Documents must be received by the relevant
Agent not later than noon, Boston, Massachusetts time or Toronto, Ontario time,
as the case may be, on the date such payment becomes due and payable. Any
payment received by the relevant Agent after such time will be deemed to have
been made on the next following Business Day. Should any such payment become due
and payable on a day other than a Business Day, the maturity of such payment
shall be extended to the next succeeding Business Day, and, in the case of a
payment of principal or past due interest, interest shall accrue and be payable
thereon for the period of such extension as provided in the Loan Document under
which such payment is due. Each payment under a Loan Document to a US Lender
Party shall be due and payable at the place provided therein and, if no specific
place of payment is provided, shall be due and payable at the place of payment
of Administrative Agent's US Note. Each Payment under a Loan Document to a
Canadian Lender Party shall be due and payable at the place provided therein,
and, if no specific place of payment is provided, shall be due and payable at
the place of payment in Canadian Administration Agent's Canadian Revolver Note.

     (b)  When Administrative Agent collects or receives money on account of the
US Obligations, other than as provided in Section 3.9, Administrative Agent
shall distribute all money so collected or received, and each US Lender Party
shall apply all such money so distributed, as follows:

          (i)  first, for the payment of all US Obligations which are then due
     (and if such money is insufficient to pay all such US Obligations, first to
     any reimbursements due Administrative Agent under Section 6.9 or 10.4 and
     then to the partial payment of all other US Obligations then due in
     proportion to the amounts thereof, or as US Lender Parties shall otherwise
     agree);

          (ii) then for the prepayment of amounts owing under the Loan Documents
     (other than principal on the US Notes or the Term Notes) if so specified by
     US Borrower or Term Borrower;

                                      60
<PAGE>

          (iii) then for the prepayment of principal on the US Notes, together
     with accrued and unpaid interest on the principal so prepaid, and then held
     as US LC Collateral pursuant to Section 2A.13(c); and

          (iv)  last, for the payment or prepayment of any other US Obligations.

All payments applied to principal or interest on any US Note or Term Note shall
be applied first to any interest then due and payable, then to principal then
due and payable, and last to any prepayment of principal and accrued interest
thereon in compliance with Sections 2A.6, 2A.7 and 2C.3(d), as applicable.  All
distributions of amounts described in any of subsections (ii), (iii), or (iv)
above shall be made by Administrative Agent pro rata to each US Lender Party
then owed US Obligations described in such subsection in proportion to all
amounts owed to all US Lender Parties which are described in such subsection;
provided that if any US Lender then owes payments to US LC Issuer for the
purchase of a participation under Section 2A.10 or to Administrative Agent under
Section 9.4, any amounts otherwise distributable under this section to such US
Lender shall be deemed to belong to US LC Issuer, or Administrative Agent,
respectively, to the extent of such unpaid payments, and Administrative Agent
shall apply such amounts to make such unpaid payments rather than distribute
such amounts to such US Lender.

     (c)  When Canadian Administration Agent collects or receives money on
account of the Canadian Obligations, other than as provided in Section 3.9,
Canadian Administration Agent shall distribute all money so collected or
received, and each Canadian Lender Party shall apply all such money so
distributed, as follows:

          (i)   first, for the payment of all Canadian Obligations which are
     then due (and if such money is insufficient to pay all such Canadian
     Obligations, first to any reimbursements due Canadian Administration Agent
     under 10.4 and then to the partial payment of all other Canadian
     Obligations then due in proportion to the amounts thereof, or as Canadian
     Lender Parties shall otherwise agree);

          (ii)  then for the prepayment of amounts owing under the Loan
     Documents (other than principal on the Canadian Revolver Notes) if so
     specified by Canadian Revolver Borrower;

          (iii) then for the prepayment of principal on the Canadian Revolver
     Notes, together with accrued and unpaid interest on the principal so
     prepaid, and then held as Canadian LC Collateral pursuant to Section 2B.17;
     and

          (iv)  last, for the payment or prepayment of any other Canadian
     Obligations.

All payments applied to principal or interest on any Canadian Revolver Note
shall be applied first to any interest then due and payable, then to principal
then due and payable, and last to any prepayment of principal and accrued
interest thereon in compliance with Sections 2B.6 and 2B.7, as applicable.  All
distributions of amounts described in any of subsections (ii), (iii), or (iv)
above shall be made by Canadian Administration Agent pro rata to each Canadian
Lender Party

                                      61
<PAGE>

then owed Canadian Obligations described in such subsection in proportion to all
amounts owed to all Canadian Lender Parties which are described in such
subsection; provided that if any Canadian Revolver Lender then owes payments to
Canadian LC Issuer for the purchase of a participation under Section 2B.14(c) or
to Canadian Administration Agent under Section 9.4, any amounts otherwise
distributable under this section to such Canadian Revolver Lender shall be
deemed to belong to Canadian LC Issuer, or Canadian Administration Agent,
respectively, to the extent of such unpaid payments, and Canadian Administration
Agent shall apply such amounts to make such unpaid payments rather than
distribute such amounts to such Canadian Revolver Lender.

     Section 3.2.  Capital Reimbursement.  If either (a) the introduction or
                   ---------------------
implementation of or the compliance with or any change in or in the
interpretation of any Law, or (b) the introduction or implementation of or the
compliance with any request, directive or guideline from any central bank or
other governmental authority (whether or not having the force of Law) affects or
would affect the amount of capital required or expected to be maintained by any
Lender Party or any corporation controlling any Lender Party, then, within five
Business Days after demand by such Lender Party, the relevant Borrower will pay
to the relevant Agent for the benefit of such Lender Party, from time to time as
specified by such Lender Party, such additional amount or amounts which such
Lender Party shall determine to be appropriate to compensate such Lender Party
or any corporation controlling such Lender Party in light of such circumstances,
to the extent that such Lender Party reasonably determines that the amount of
any such capital would be increased or the rate of return on any such capital
would be reduced by or in whole or in part based on the existence of the face
amount of such Lender Party's Loans, Letters of Credit, participations in
Letters of Credit, in Banker's Acceptances, or commitments under this Agreement.

     Section 3.3.  Increased Cost of LIBOR Loans or Letters of Credit.  If any
                   --------------------------------------------------
applicable Law (whether now in effect or hereinafter enacted or promulgated,
including Regulation D) or any interpretation or administration thereof by any
governmental authority charged with the interpretation or administration thereof
(whether or not having the force of Law):

          (a)  shall change the basis of taxation of payments to any Lender
     Party of any principal, interest, or other amounts attributable to any
     LIBOR Loan or Letter of Credit or otherwise due under this Agreement in
     respect of any LIBOR Loan or Letter of Credit (other than taxes imposed on,
     or measured by, the overall net income of such Lender Party or any
     Applicable Lending Office of such Lender Party by any jurisdiction in which
     such Lender Party or any such Applicable Lending Office is located); or

          (b)  shall change, impose, modify, apply or deem applicable any
     reserve, special deposit or similar requirements in respect of any LIBOR
     Loan or any Letter of Credit (excluding those for which such Lender Party
     is fully compensated pursuant to adjustments made in the definition of US
     LIBOR Rate) or against assets of, deposits with or for the account of, or
     credit extended by, such Lender Party; or

                                      62
<PAGE>

          (c)  shall impose on any Lender Party or the interbank eurocurrency
     deposit market any other condition affecting any LIBOR Loan or Letter of
     Credit, the result of which is to increase the cost to any Lender Party of
     funding or maintaining any LIBOR Loan or of issuing any Letter of Credit or
     to reduce the amount of any sum receivable by any Lender Party in respect
     of any LIBOR Loan or Letter of Credit by an amount deemed by such Lender
     Party to be material,

then such Lender Party shall promptly notify Administrative Agent and Borrower
in writing of the happening of such event and of the amount required to
compensate such Lender Party for such event (on an after-tax basis, taking into
account any taxes on such compensation), whereupon (i) Borrower shall, within
five Business Days after demand therefor by such Lender Party, pay such amount
to Administrative Agent for the account of such Lender Party and (ii Borrower
may elect, by giving to Administrative Agent and such Lender Party not less than
three Business Days' notice, to Convert all (but not less than all) of any such
LIBOR Loans into Base Rate Loans.

     Section 3.4.  Notice; Change of Applicable Lending Office.  A Lender Party
                   -------------------------------------------
shall notify the relevant Borrower of any event occurring after the date of this
Agreement that will entitle such Lender Party to compensation under Section 3.2,
3.3, or 3.5 hereof as promptly as practicable, but in any event within 90 days,
after such Lender Party obtains actual knowledge thereof; provided, that (i) if
                                                          --------
such Lender Party fails to give such notice within 90 days after it obtains
actual knowledge of such an event, such Lender Party shall, with respect to
compensation payable pursuant to Section 3.2, 3.3, or 3.5 in respect of any
costs resulting from such event, only be entitled to payment under Section 3.2,
3.3, or 3.5 hereof for costs incurred from and after the date 90 days prior to
the date that such Lender Party does give such notice and (ii) such Lender Party
will designate a different Applicable Lending Office for the Loans affected by
such event if such designation will avoid the need for, or reduce the amount of,
such compensation and will not, in the sole opinion of such Lender Party, be
disadvantageous to such Lender Party, except that such Lender Party shall have
no obligation to designate an Applicable Lending Office located in the United
States of America.  Each Lender Party will furnish to the relevant Borrower a
certificate setting forth the basis and amount of each request by such Lender
Party for compensation under Section 3.2, 3.3, or 3.5 hereof.

     Section 3.5.  Availability.  If (a) any change in applicable Laws, or in
                   ------------
the interpretation or administration thereof of or in any jurisdiction
whatsoever, domestic or foreign, shall make it unlawful or impracticable for any
Lender Party to fund or maintain LIBOR Loans, accept BA's or to issue or
participate in Letters of Credit, or shall materially restrict the authority of
any Lender Party to purchase or take offshore deposits of dollars (i.e.,
"eurodollars"), or (b) any Lender Party determines that matching deposits
appropriate to fund or maintain any LIBOR Loan are not available to it, or (c)
any Lender Party determines that the formula for calculating the US LIBOR Rate
does not fairly reflect the cost to such Lender Party of making or maintaining
loans based on such rate, in each case with respect to the relevant Commitment
hereunder, then, upon notice by such Lender Party to the relevant Borrower and
the relevant Agent, such Borrower's right to elect LIBOR Loans from such Lender
Party or issue BA's (or, if applicable, to obtain Letters of Credit) shall be
suspended to the extent and for the duration of

                                      63
<PAGE>

such illegality, impracticability or restriction and all LIBOR Loans of such
Lender Party which are then outstanding and all BA's which are then outstanding
or are then the subject of any Borrowing Notice and which cannot lawfully or
practicably be maintained, funded or accepted shall immediately become or
remain, or shall be funded as, Base Rate Loans of such Lender Party. With
respect to each Commitment, the relevant Borrower thereunder agrees to indemnify
each Lender Party extending credit pursuant thereto, and hold each such Lender
Party harmless against all costs, expenses, claims, penalties, liabilities and
damages which may result from any such change in Law, interpretation or
administration. Such indemnification shall be on an after-tax basis, taking into
account any taxes imposed on the amounts paid as indemnity.

     Section 3.6.  Funding Losses.  In addition to its other obligations
                   --------------
hereunder, with respect to each Commitment, the relevant Borrower thereunder
will indemnify each Lender Party extending credit pursuant thereto against, and
reimburse each Lender Party on demand for, any loss or expense incurred or
sustained by such Lender Party (including any loss or expense incurred by reason
of the liquidation or reemployment of deposits or other funds acquired by such
Lender Party to fund or maintain LIBOR Loans), as a result of (a) any payment or
prepayment (whether or not authorized or required hereunder) of all or a portion
of a LIBOR Loan on a day other than the day on which the applicable Interest
Period ends, (b) any payment or prepayment, whether or not required hereunder,
of a Loan made after the delivery, but before the effective date, of a
Continuation/Conversion Notice, if such payment or prepayment prevents such
Continuation/Conversion Notice from becoming fully effective, (c) the failure of
any Loan to be made or of any Continuation/Conversion Notice to become effective
due to any condition precedent not being satisfied or due to any other action or
inaction of any Restricted Person, or (d) any Conversion (whether or not
authorized or required hereunder) of all or any portion of any LIBOR Loan into a
Base Rate Loan or into a different LIBOR Loan on a day other than the day on
which the applicable Interest Period ends.  Such indemnification shall be on an
after-tax basis, taking into account any taxes imposed on the amounts paid as
indemnity.

     Section 3.7.  Reimbursable Taxes.  With respect to each Commitment, the
                   ------------------
relevant Borrower thereunder covenants and agrees with each Lender Party
extending credit pursuant thereto that:

          (a)  Such Borrower will indemnify each such Lender Party against and
     reimburse each such Lender Party for all present and future stamp and other
     taxes, duties, levies, imposts, deductions, charges, costs, and
     withholdings whatsoever imposed, assessed, levied or collected on or in
     respect of this Agreement, any LIBOR Loans, any BA's or Letters of Credit
     (whether or not legally or correctly imposed, assessed, levied or
     collected) including all taxes imposed pursuant to Part XIII of the Income
     Tax Act (Canada) and any withholding or other taxes imposed on any Lender
     Party under Canadian Law, excluding, however, any taxes imposed on or
     measured by the overall net income of any Agent or such Lender Party or any
     Applicable Lending Office of such Lender Party by any jurisdiction in which
     such Lender Party or any such Applicable Lending Office is located (all
     such non-excluded taxes, levies, costs and charges being collectively
     called "Reimbursable Taxes" in this section).  Such indemnification shall
     be

                                      64
<PAGE>

     on an after-tax basis, taking into account any taxes imposed on the amounts
     paid as indemnity.

          (b)  All payments on account of the principal of, and interest on,
     each such Lender Party's Loans and Notes, and all other amounts payable by
     such Borrower to any such Lender Party hereunder, shall be made in full
     without set-off or counterclaim and shall be made free and clear of and
     without deductions or withholdings of any nature by reason of any
     Reimbursable Taxes, all of which will be for the account of the relevant
     Borrower. In the event of any such Borrower being compelled by Law to make
     any such deduction or withholding from any payment to any such Lender
     Party, such Borrower shall pay on the due date of such payment, by way of
     additional interest, such additional amounts as are needed to cause the
     amount receivable by such Lender Party after such deduction or withholding
     to equal the amount which would have been receivable in the absence of such
     deduction or withholding. If any such Borrower should make any deduction or
     withholding as aforesaid, such Borrower shall within 60 days thereafter
     forward to such Lender Party an official receipt or other official document
     evidencing payment of such deduction or withholding.

          (c)  If any such Borrower is ever required to pay any Reimbursable Tax
     with respect to any LIBOR Loan, such Borrower may elect, by giving to the
     relevant Agent and such Lender Party not less than three Business Days'
     notice, to Convert all (but not less than all) of any such LIBOR Loan into
     a Base Rate Loan, but such election shall not diminish such Borrower's
     obligation to pay all Reimbursable Taxes.

          (d)  Notwithstanding the foregoing provisions of this section, such
     Borrower shall be entitled, to the extent it is required to do so by Law,
     to deduct or withhold (and not to make any indemnification or reimbursement
     for) income or other similar taxes imposed by the United States of America
     or Canada (other than any portion thereof attributable to a change in
     federal income tax Laws effected after the date hereof) from interest, fees
     or other amounts payable hereunder for the account of such Lender Party,
     other than such a Lender Party (i) who is a US person for Federal income
     tax purposes or (ii) who has the Prescribed Forms on file with
     Administrative Agent (with copies provided to the relevant Borrower) for
     the applicable year to the extent deduction or withholding of such taxes is
     not required as a result of the filing of such Prescribed Forms, provided
     that if such Borrower shall so deduct or withhold any such taxes, it shall
     provide a statement to Administrative Agent and such Lender Party, setting
     forth the amount of such taxes so deducted or withheld, the applicable rate
     and any other information or documentation which such Lender Party may
     reasonably request for assisting such Lender Party to obtain any allowable
     credits or deductions for the taxes so deducted or withheld in the
     jurisdiction or jurisdictions in which such Lender Party is subject to tax.
     As used in this section, "Prescribed Forms" means such duly executed forms
     or statements, and in such number of copies, which may, from time to time,
     be prescribed by Law and which, pursuant to applicable provisions of (x) an
     income tax treaty between the United States and the country of residence of
     such Lender Party providing the forms or statements, (y) the Code, or (z)
     any applicable rules or regulations

                                      65
<PAGE>

     thereunder, permit such Borrower to make payments hereunder for the account
     of such Lender Party free of such deduction or withholding of income or
     similar taxes.

     Section 3.8.  Replacement of Lenders.  If any Lender Party seeks
                   ----------------------
reimbursement for increased costs under Sections 3.2 through 3.7, then within
ninety days thereafter -- provided no Event of Default then exists -- each
Borrower shall have the right (unless such Lender Party withdraws its request
for additional compensation) to replace such Lender Party by requiring such
Lender Party to assign its Loans and Notes and its commitments hereunder to an
Eligible Transferee reasonably acceptable to Administrative Agent and to the
relevant Borrower, provided that:  (i) all Obligations of such Borrower owing to
such Lender Party being replaced (including such increased costs and any
breakage costs with respect to any outstanding LIBOR Loans, but excluding
principal and accrued interest on the Notes being assigned) shall be paid in
full to such Lender Party concurrently with such assignment, and (ii) the
replacement Eligible Transferee shall purchase the Notes being assigned by
paying to such Lender Party a price equal to the principal amount thereof plus
accrued and unpaid interest and accrued and unpaid commitment fees thereon.  In
connection with any such assignment the relevant Borrower, Administrative Agent,
such Lender Party and the replacement Eligible Transferee shall otherwise comply
with Section 10.5.  Notwithstanding the foregoing rights of each Borrower under
this section, however, Borrowers may not replace any Lender Party which seeks
reimbursement for increased costs under Section 3.2 through 3.7 unless such
Borrower is at the same time replacing all Lender Parties which are then seeking
such compensation.

     Section 3.9.  Application of Proceeds After Acceleration.  If any Event of
                   ------------------------------------------
Default shall have occurred and be continuing, and if the Obligations have
become due and payable, all cash collateral held by Administrative Agent or
Canadian Administration Agent under this Agreement and the proceeds of any sale,
disposition, or other realization by Administrative Agent, Canadian
Administration Agent or the collateral agent under the Intercreditor Agreement
upon the Collateral (or any portion thereof) pursuant to the Security Documents,
shall be distributed in whole or in part by Administrative Agent in the
following order of priority, unless otherwise directed by all of the Lenders:

     First, to the Administrative Agent and Canadian Administration Agent,
     -----
ratably, in an amount equal to all reimbursements to Administrative Agent or
Canadian Administration Agent due and payable as of the date of such
distribution; provided, however, that in case such proceeds shall be
insufficient to pay in full all such Obligations, then to the payment thereof to
the Administrative Agent and Canadian Administration Agent, ratably, in
proportion to its percentage of the sum of the aggregate amounts of all such
Obligations;

     Second, to the Lenders, ratably, in an amount equal to all accrued and
     ------
unpaid interest and fees owing to the Lenders under this Agreement due and
payable as of the date of such distribution; provided, however, that in case
such proceeds shall be insufficient to pay in full all such Obligations, then to
the payment thereof to the Lenders, ratably, in proportion to its percentage of
the sum of the aggregate amounts of all such Obligations;

                                      66
<PAGE>

     Third, to the Lenders, ratably, in an amount equal to all Loans plus LC
     -----
Obligations; provided, however, that in the case such proceeds shall be
insufficient to pay in full all such Obligations, then to the payment thereof to
the Lenders, ratably, in proportion to its percentage of the sum of the
aggregate amounts of all such Obligations;

     Fourth, to the Lenders, ratably, in an amount equal to all amounts owing to
     ------
the Lenders under all Obligations with respect to Hedging Contracts between any
Restricted Person and any Lender or an Affiliate; provided, however, that in
case such proceeds shall be insufficient to pay in full all such Obligations,
then to the payment thereof to the Lenders, ratably, in proportion to its
percentage of the sum of the aggregate amounts of all such Obligations;

     Fifth, to the Lenders in an amount equal to all other Obligations;
     -----
provided, however, that in the case such proceeds shall be insufficient to pay
in full such Obligations, then to the payment thereof to the Lenders, ratably,
in proportion to its percentage of the sum of the aggregate amounts of all such
Obligations; and

     Sixth, to the extent of any surplus, to the Restricted Persons as their
     -----
respective interests may appear, except as may be provided otherwise by law;

it being understood that the Restricted Persons shall remain liable to the
extent of any deficiency between the amount of proceeds of the Collateral and
the aggregate sums referred to in clauses First through Fifth above.

     Section 3.10.  Currency Conversion and Indemnity.
                    ---------------------------------

     (a)  If, for the purpose of obtaining or enforcing judgment in any court in
any jurisdiction, it becomes necessary to convert into a particular currency
(the "Judgment Currency") any amount due under a Loan Document in the currency
in which it was effected (the "Agreed Currency") then the conversion shall be
made on the basis of the rate of exchange prevailing on the Business Day
preceding the date such judgment is given and in any event each Restricted
Person obligated to pay such Obligation shall be obligated to pay the relevant
Lender Parties any deficiency in accordance with Section 3.10(b).  For the
foregoing purposes "rate of exchange" means the rate at which the relevant
Agent, as applicable, in accordance with its normal banking procedures is able
on the relevant date to purchase the Agreed Currency with the Judgment Currency
after deducting any premium and costs of exchange.

     (b)  If any Lender Party receives any payment or payments on account of the
liability of a Restricted Person under the Loan Documents pursuant to any
judgment or order in any currency other than the Agreed Currency (an "Other
Currency"), and  the amount of the Agreed Currency which the relevant Lender
Party is able to purchase on the Business Day next following such receipt with
the proceeds of such payment or payments in accordance with its normal
procedures and after deducting any premiums and costs of exchange is less than
the amount of the Agreed Currency due in respect of such Obligations immediately
prior to such judgment or order, then the Borrower owing such Obligation on
demand shall, and such Borrower hereby agrees to, indemnify and save such Lender
Party harmless from and against any loss, cost or

                                      67
<PAGE>

expense arising out of or in connection with such deficiency. The agreement of
indemnity provided for in this Section 3.10(b) shall constitute an obligation
separate and independent from all other obligations contained in this Agreement,
shall give rise to a separate and independent cause of action, shall apply
irrespective of any indulgence granted by the Lender Parties or any of them from
time to time, and shall continue in full force and effect notwithstanding any
judgment or order for a liquidated sum in respect of an amount due hereunder or
under any judgment or order.

                 ARTICLE IV - Conditions Precedent to Lending
                              -------------------------------

     Section 4.1.  Documents to be Delivered.  No Lender has any obligation to
                   -------------------------
make its first Loan, US LC Issuer has no obligation to issue the first US Letter
of Credit, and Canadian LC Issuer has no obligation to issue the first Canadian
Letter of Credit, unless Administrative Agent shall have received all of the
following, at Administrative Agent's office in Boston, Massachusetts, duly
executed and delivered and in form, substance and date satisfactory to
Administrative Agent:

          (a)  This Agreement and any other documents that Lenders are to
     execute in connection herewith.

          (b)  Each Note.

          (c)  Each Security Document listed in the Security Schedule.

          (d)  Certain certificates including:

               (i)   An "Omnibus Certificate" of the secretary and of the
          president of General Partner, which shall contain the names and
          signatures of the officers of General Partner authorized to execute
          Loan Documents and which shall certify to the truth, correctness and
          completeness of the following exhibits attached thereto: (1) a copy of
          resolutions duly adopted by the Board of Directors of General Partner
          and in full force and effect at the time this Agreement is entered
          into, authorizing the execution of this Agreement and the other Loan
          Documents delivered or to be delivered in connection herewith and the
          consummation of the transactions contemplated herein and therein, (2)
          a copy of the charter documents of each Restricted Person and all
          amendments thereto, certified by the appropriate official of such
          Restricted Person's jurisdiction of organization, and (3) a copy of
          any bylaws or agreement of limited partnership of each Restricted
          Person;

               (ii)  A certificate of the president and of the chief financial
          officer of General Partner, regarding satisfaction of Section 4.2; and

               (iii) A solvency certificate from each of US Borrower, Term
          Borrower, and Canadian Revolver Borrower and each Guarantor, with
          attached pro forma

                                      68
<PAGE>

          balance sheet for such Person giving effect to the transactions
          contemplated by the Murphy Acquisition Documents.

          (e)  A certificate (or certificates) of the due formation, valid
     existence and good standing of each Restricted Person in its respective
     jurisdiction of organization, issued by the appropriate authorities of such
     jurisdiction, and certificates of each Restricted Person's good standing
     and due qualification to do business, issued by appropriate officials in
     any jurisdictions in which such Restricted Person owns property subject to
     Security Documents.

          (f)  Documents similar to those specified in subsections (d)(i) and
     (e) of this section with respect to each Guarantor and the execution by it
     of its guaranty of Borrower's Obligations.

          (g)  A favorable opinion of Tim Moore, Esq., General Counsel for
     Restricted Persons, substantially in the form set forth in Exhibit E-1,
     Fulbright & Jaworski L.L.P., special Texas and New York counsel to
     Restricted Persons, substantially in the form set forth in Exhibit E-2,
     Bennett Jones LLP, special Canadian Counsel for Restricted Persons,
     substantially in the form set forth in Exhibit E-3, and local counsel for
     the states of California and Oklahoma satisfactory to Administrative Agent.

          (h)  The Initial Financial Statements.

          (i)  Certificates or binders evidencing Restricted Persons' insurance
     in effect on the date hereof.

          (j)  Copies of such permits and approvals regarding the property and
     business of Restricted Persons as Administrative Agent may request.

          (k)  A certificate signed by the chief executive officer of General
     Partner in form and detail acceptable to Administrative Agent confirming
     the insurance that is in effect as of the date hereof and certifying that
     such insurance is customary for the businesses conducted by Restricted
     Persons and is in compliance with the requirements of this Agreement.

          (l)  Payment of all commitment, facility, agency and other fees
     required to be paid to any Lender pursuant to any Loan Documents or any
     commitment agreement heretofore entered into.

          (m)  The Intercreditor Agreement.

          (n)  US Borrower and Canadian Revolver Borrower shall have adopted
     such risk management procedures and controls and such trading policies as
     shall be satisfactory to each Agent in its sole and absolute discretion.

                                      69
<PAGE>

          (o)  Each Agent and its counsel shall have reviewed and approved, in
     its sole and absolute discretion, all outstanding Plains MLP or Resources
     shareholder litigation and available insurance with respect thereto.

          (p)  The Murphy Acquisition Documents, and the Murphy Acquisition
     Closing Date shall have previously or contemporaneously occurred.

          (q)  Each Restricted Person shall have executed and delivered the
     Marketing Credit Agreement and all conditions precedent to the Marketing
     Credit Agreement shall have been satisfied.

          (r)  General Partner shall have delivered to Administrative Agent a
     certificate by the chief financial officer of General Partner, certifying
     the pro forma Initial Financial Statements delivered pursuant to clause (h)
     above and reflecting pro forma compliance with each event specified in
     Sections 7.11 through 7.14, inclusive.

     Section 4.2.  Additional Conditions Precedent.  No Lender has any
                   -------------------------------
obligation to make any Loan (including its first), and LC Issuer has no
obligation to issue any Letter of Credit (including its first), unless the
following conditions precedent have been satisfied:

          (a)  All representations and warranties made by any Restricted Person
     in any Loan Document shall be true on and as of the date of such Loan or
     the date of issuance of such Letter of Credit as if such representations
     and warranties had been made as of the date of such Loan or the date of
     issuance of such Letter of Credit except to the extent that such
     representation or warranty was made as of a specific date or updated,
     modified or supplemented as of a subsequent date with the consent of
     Majority Lenders.

          (b)  No Default shall exist at the date of such Loan or the date of
     issuance of such Letter of Credit.

          (c)  No Material Adverse Change shall have occurred to, and no event
     or circumstance shall have occurred that could cause a Material Adverse
     Change to, Plains MLP's or Borrower's Consolidated financial condition or
     businesses since the date of the Initial Financial Statements.

          (d)  Each Restricted Person shall have performed and complied with all
     agreements and conditions required in the Loan Documents to be performed or
     complied with by it on or prior to the date of such Loan or the date of
     issuance of such Letter of Credit.

          (e)  The making of such Loan or the issuance of such Letter of Credit
     shall not be prohibited by any Law and shall not subject any Lender or any
     LC Issuer to any penalty or other onerous condition under or pursuant to
     any such Law.

                                      70
<PAGE>

          (f)  Administrative Agent shall have received all documents and
     instruments which Administrative Agent has then requested, in addition to
     those described in Section 4.1 (including opinions of legal counsel for
     Restricted Persons and Administrative Agent; corporate documents and
     records; documents evidencing governmental authorizations, consents,
     approvals, licenses and exemptions; and certificates of public officials
     and of officers and representatives of Borrower and other Persons), as to
     (i) the accuracy and validity of or compliance with all representations,
     warranties and covenants made by any Restricted Person in this Agreement
     and the other Loan Documents, (ii the satisfaction of all conditions
     contained herein or therein, and (ii all other matters pertaining hereto
     and thereto.  All such additional documents and instruments shall be
     satisfactory to Administrative Agent in form, substance and date.

                  ARTICLE V - Representations and Warranties
                              ------------------------------

     To confirm each Lender's understanding concerning Restricted Persons and
Restricted Persons' businesses, properties and obligations and to induce each
Lender to enter into this Agreement and to extend credit hereunder, after giving
effect to the consummation of the transactions set forth in the Murphy
Acquisition Documents, Plains MLP, US Borrower, Term Borrower, and Canadian
Revolver Borrower represent and warrant to each Lender that:

     Section 5.1.  No Default.  No Restricted Person is in default in the
                   ----------
performance of any of the covenants and agreements contained in any Loan
Document.  No event has occurred and is continuing which constitutes a Default.

     Section 5.2.  Organization and Good Standing.  Each Restricted Person is
                   ------------------------------
duly organized, validly existing and in good standing under the Laws of its
jurisdiction of organization, having all powers required to carry on its
business and enter into and carry out the transactions contemplated hereby.
Each Restricted Person is duly qualified, in good standing, and authorized to do
business in all other jurisdictions within the United States and Canada wherein
the character of the properties owned or held by it or the nature of the
business transacted by it makes such qualification necessary except where the
failure to so qualify would not cause a Material Adverse Change.  Each
Restricted Person has taken all actions and procedures customarily taken in
order to enter, for the purpose of conducting business or owning property, each
jurisdiction outside the United States and Canada wherein the character of the
properties owned or held by it or the nature of the business transacted by it
makes such actions and procedures necessary except where the failure to so
qualify would not cause a Material Adverse Change.

     Section 5.3.  Authorization.  Each Restricted Person has duly taken all
                   -------------
action necessary to authorize the execution and delivery by it of the Loan
Documents to which it is a party and to authorize the consummation of the
transactions contemplated thereby and the performance of its obligations
thereunder.  Each of US Borrower, Term Borrower, and Canadian Revolver Borrower
is duly authorized to borrow funds hereunder.

                                      71
<PAGE>

     Section 5.4.  No Conflicts or Consents.  The execution and delivery by the
                   ------------------------
various Restricted Persons of the Loan Documents and Murphy Acquisition
Documents to which each is a party, the performance by each of its obligations
under such Loan Documents and Murphy Acquisition Documents, and the consummation
of the transactions contemplated by the various Loan Documents and various
Murphy Acquisition Documents, do not and will not (i) conflict with any
provision of (1) any Law, (2) the organizational documents of any Restricted
Person or any of its Affiliates, or (3) any agreement, judgment, license, order
or permit applicable to or binding upon any Restricted Person or any of its
Affiliates, (ii result in the acceleration of any Indebtedness owed by any
Restricted Person or any of its Affiliates, or (ii result in or require the
creation of any Lien upon any assets or properties of any Restricted Person or
any of its Affiliates except as expressly contemplated in the Loan Documents.
Except as expressly contemplated in the Loan Documents or disclosed in the
Disclosure Schedule, no permit, consent, approval, authorization or order of,
and no notice to or filing, registration or qualification with, any Tribunal or
third party is required (i) in connection with the execution, delivery or
performance by any Restricted Person of any Loan Document or the Murphy
Acquisition Documents, or (ii) to consummate any transactions contemplated by
the Loan Documents and the Murphy Acquisition Documents (except, in each case
with respect to the Murphy Acquisition Documents, as may be waived by the
parties thereto or the party thereunder to whom such obligation is owed or who
has imposed such obligation), other than consents, approvals, authorizations or
orders that have been obtained or notices given or filings made prior to the
date hereof and other than various notices or filings required to be given or
made following the effectiveness of the Murphy Acquisition Documents.

     Section 5.5.  Enforceable Obligations.  This Agreement is, and the other
                   -----------------------
Loan Documents and the Murphy Acquisition Documents when duly executed and
delivered will be, legal, valid and binding obligations of each Restricted
Person which is a party hereto or thereto, enforceable in accordance with their
terms except as such enforcement may be limited by bankruptcy, insolvency or
similar Laws of general application relating to the enforcement of creditors'
rights.

     Section 5.6.  Initial Financial Statements.  Plains MLP has heretofore
                   ----------------------------
delivered to each Lender true, correct and complete copies of the Initial
Financial Statements.  The Initial Financial Statements other than pro forma
financial statements fairly present Plains MLP's Consolidated and consolidating
financial position at the date thereof and the Consolidated and consolidating
results of Plains MLP's operations for the periods thereof, and in the case of
the annual Initial Financial Statements, Consolidated cash flows for the period
thereof.  The pro forma Initial Financial Statements fairly present Plains MLP's
pro forma Consolidated and consolidating financial position at the date thereof
and the pro forma Consolidated results of Plains MLP's operations for the period
thereof.  Since the date of the annual Initial Financial Statements no Material
Adverse Change has occurred, except as reflected in the quarterly Initial
Financial Statements or in the Disclosure Schedule.  All Initial Financial
Statements other than pro forma financial statements were prepared in accordance
with GAAP.  All Initial Financial Statements that are pro forma financial
statements were prepared in accordance with GAAP with such pro forma adjustments
as have been accepted by Administrative Agent.

                                      72
<PAGE>

     Section 5.7.  Other Obligations and Restrictions.  No Restricted Person
                   ----------------------------------
has any outstanding Liabilities of any kind (including contingent obligations,
tax assessments, and unusual forward or long-term commitments) which are, in the
aggregate, material to Plains MLP or material with respect to Plains MLP's
Consolidated financial condition and not shown in the Initial Financial
Statements, disclosed in the Disclosure Schedule or otherwise permitted under
Section 7.1.  Except as shown in the Initial Financial Statements or disclosed
in the Disclosure Schedule, no Restricted Person is subject to or restricted by
any franchise, contract, deed, charter restriction, or other instrument or
restriction which could cause a Material Adverse Change.

     Section 5.8.  Full Disclosure.  No certificate, statement or other
                   ---------------
information delivered herewith or heretofore by any Restricted Person to any
Lender in connection with the negotiation of this Agreement or in connection
with any transaction contemplated hereby contains any untrue statement of a
material fact or omits to state any material fact necessary to make the
statements contained herein or therein, in light of the circumstances under
which they were made, not misleading as of the date made or deemed made.  All
written information furnished after the date hereof by or on behalf of any
Restricted Person to Administrative Agent or any Lender Party in connection with
this Agreement and the other Loan Documents and the transactions contemplated
hereby and thereby will be true, complete and accurate in every material respect
in light of the circumstances in which made or based on reasonable estimates on
the date as of which such information is stated or certified.  There is no fact
known to any Restricted Person that has not been disclosed to each Lender in
writing which could cause a Material Adverse Change.

     Section 5.9.  Litigation.  Except as disclosed in the Initial Financial
                   ----------
Statements, in the Disclosure Schedule or pursuant to Section 6.4:  (i) there
are no actions, suits or legal, equitable, arbitrative or administrative
proceedings pending, or to the knowledge of any Restricted Person threatened,
against any Restricted Person or affecting any Collateral (including, without
limitation, any which challenge or otherwise pertain to any Restricted Person's
title to any Collateral) before any Tribunal which could reasonably be expected
to cause a Material Adverse Change, and (ii) there are no outstanding judgments,
injunctions, writs, rulings or orders by any such Tribunal against any
Restricted Person or any Restricted Person's stockholders, partners, directors
or officers or affecting any Collateral which could reasonably be expected to
cause a Material Adverse Change.

     Section 5.10. Labor Disputes and Acts of God.  Except as disclosed in the
                   ------------------------------
Disclosure Schedule or otherwise disclosed in writing to Administrative Agent,
neither the business nor the properties of any Restricted Person has been
affected by any fire, explosion, accident, strike, lockout or other labor
dispute, drought, storm, hail, earthquake, embargo, act of God or of the public
enemy or other casualty (whether or not covered by insurance), which could cause
a Material Adverse Change.

     Section 5.11. ERISA Plans and Liabilities.  All currently existing ERISA
                   ---------------------------
Plans are listed in the Disclosure Schedule.  Except as disclosed in the Initial
Financial Statements or in the Disclosure Schedule, no Termination Event has
occurred with respect to any ERISA Plan and all ERISA Affiliates are in
compliance with ERISA in all material respects.  No ERISA Affiliate is

                                      73
<PAGE>

required to contribute to, or has any other absolute or contingent liability in
respect of, any "multiemployer plan" as defined in Section 4001 of ERISA. Except
as set forth in the Disclosure Schedule: (i) no "accumulated funding deficiency"
(as defined in Section 412(a) of the Code) exists with respect to any ERISA
Plan, whether or not waived by the Secretary of the Treasury or his delegate,
and (ii) the current value of each ERISA Plan's benefits does not exceed the
current value of such ERISA Plan's assets available for the payment of such
benefits by more than $500,000.

     Section 5.12.  Compliance with Laws.  Except as set forth in the
                    --------------------
Disclosure Schedule, each Restricted Person has all permits, licenses and
authorizations required in connection with the conduct of its businesses, except
to the extent failure to have any such permit, license or authorization could
not cause a Material Adverse Change.  Each Restricted Person is in compliance
with the terms and conditions of all such permits, licenses and authorizations,
and is also in compliance with all other limitations, restrictions, conditions,
standards, prohibitions, requirements, obligations, schedules and timetables
contained in any Law, including applicable Environmental Law, or in any
regulation, code, plan, order, decree, judgment, injunction, notice or demand
letter issued, entered, promulgated or approved thereunder, except to the extent
failure to comply could not cause a Material Adverse Change.  Without limiting
the foregoing, each Restricted Person (i) has filed and maintained all tariffs
applicable to its business with each applicable commission, (ii) and all such
tariffs are in compliance with all Laws administered or promulgated by each
applicable commission and (iii) has imposed charges on its customers in
compliance with such  tariffs, all contracts applicable to its business and all
applicable Laws.  As used herein, "commission" includes the Federal Energy
Regulatory Commission, the Public Utility Commission of the State of California
and each other US federal, Canadian federal, state, provincial, or local
governmental department, commission, board, bureau, agency or instrumentality
having jurisdiction over any Restricted Person or its properties.

     Section 5.13.  Environmental Laws.  As used in this section: "CERCLA"
                    ------------------                             ------
means the Comprehensive Environmental Response, Compensation and Liability Act
of 1980, as amended, "CERCLIS" means the Comprehensive Environmental Response,
                      -------
Compensation and Liability Information System List of the Environmental
Protection Agency, and "Release" has the meaning given such term in 42 U.S.C.
                        -------
(S) 9601(22).  Without limiting the provisions of Section 5.12, and except as
set forth in the Disclosure Schedule:

          (a)  No notice, notification, demand, request for information,
     citation, summons or order has been issued, no complaint has been filed, no
     penalty has been assessed, and no investigation or review is pending or
     threatened by any Tribunal or any other Person with respect to any of the
     following which in the aggregate could cause a Material Adverse Change: (i)
     any alleged generation, treatment, storage, recycling, transportation,
     disposal, or Release of any Hazardous Materials, either by any Restricted
     Person or on any property owned by any Restricted Person, (ii) any remedial
     action which might be needed to respond to any such alleged generation,
     treatment, storage, recycling, transportation, disposal, or Release, or
     (iii) any alleged failure by any Restricted Person to have any permit,
     license or authorization required in connection with

                                      74
<PAGE>

     the conduct of its business or with respect to any such generation,
     treatment, storage, recycling, transportation, disposal, or Release.

          (b)  No Restricted Person otherwise has any known material contingent
     liability in connection with any alleged generation, treatment, storage,
     recycling, transportation, disposal, or Release of any Hazardous Materials.

          (c)  No Restricted Person has handled any Hazardous Materials, other
     than as a generator, on any properties now or previously owned or leased by
     any Restricted Person to an extent that such handling has caused, or could
     cause, a Material Adverse Change.

          (d)  Except to the extent that the following in the aggregate has not
     caused and could not cause a Material Adverse Change:

               (i)   no PCBs are or have been present at any properties now or
          previously owned or leased by any Restricted Person;

               (ii)  no asbestos is or has been present at any properties now or
          previously owned or leased by any Restricted Person;

               (iii) there are no underground storage tanks for Hazardous
          Materials, active or abandoned, at any properties now or previously
          owned or leased by any Restricted Person; and

               (iv)  no Hazardous Materials have been Released at, on or under
          any properties now or previously owned or leased by any Restricted
          Person.

          (e)  No Restricted Person has transported or arranged for the
     transportation of any Hazardous Material to any location which is listed on
     the National Priorities List under CERCLA, any location listed for possible
     inclusion on the National Priorities List by the Environmental Protection
     Agency in CERCLIS, nor, except to the extent that has not caused and could
     not cause a Material Adverse Change, any location listed on any similar
     state list or which is the subject of federal, state or local enforcement
     actions or other investigations which may lead to claims against any
     Restricted Person for clean-up costs, remedial work, damages to natural
     resources or for personal injury claims, including, but not limited to,
     claims under CERCLA.

          (f)  No property now or previously owned or leased by any Restricted
     Person is listed or proposed for listing on the National Priority list
     promulgated pursuant to CERCLA, in CERCLIS, nor, except to the extent that
     has not caused and could not cause a Material Adverse Change, on any
     similar state list of sites requiring investigation or clean-up.

          (g)  There are no Liens arising under or pursuant to any Environmental
     Laws on any of the real properties or properties owned or leased by any
     Restricted Person, and

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<PAGE>

     no government actions of which Borrower is aware have been taken or are in
     process which could subject any of such properties to such Liens; nor would
     any Restricted Person be required to place any notice or restriction
     relating to the presence of Hazardous Materials at any properties owned by
     it in any deed to such properties.

          (h)  There have been no environmental investigations, studies, audits,
     tests, reviews or other analyses for ground water or soil contamination
     relating to the Release of Hazardous Materials conducted by or which are in
     the possession of any Restricted Person in relation to any properties or
     facility now or previously owned or leased by any Restricted Person which
     have not been made available to Administrative Agent.

          (i)  (i)  Canadian Revolver Borrower and Term Borrower and each
     Subsidiary of either such Person are conducting their businesses in
     material compliance with all applicable Laws, including Environmental Laws,
     and have and are in compliance with all licenses and permits required under
     any such Laws, unless failure to so comply could not reasonably be expected
     to cause a Material Adverse Change; (ii) none of the operations or
     properties of Canadian Revolver Borrower, Term Borrower or any Subsidiary
     of either such Person is the subject of federal, provincial or local
     investigation evaluating whether any material remedial action is needed to
     respond to a release of any Hazardous Materials into the environment or to
     the improper storage or disposal (including storage or disposal at offsite
     locations) of any Hazardous Materials, unless such remedial action could
     not reasonably be expected to cause a Material Adverse Change; and (iii)
     neither Canadian Revolver Borrower nor Term Borrower nor any Subsidiary of
     either such Person (and to the best knowledge of Canadian Revolver Borrower
     and Term Borrower, no other Person) has filed any notice under any Law
     indicating that any such Person is responsible for the improper release
     into the environment, or the improper storage or disposal, of any material
     amount of any Hazardous Materials or that any Hazardous Materials have been
     improperly released, or are improperly stored or disposed of, upon any
     property of any such Person, unless such failure to so comply could not
     reasonably be expected to cause a Material Adverse Change.

     Section 5.14.  Names and Places of Business.  No Restricted Person has,
                    ----------------------------
during the preceding five years, had, been known by, or used any other trade or
fictitious name, except as disclosed in the Disclosure Schedule.  Except as
otherwise indicated in the Disclosure Schedule, the chief executive office and
principal place of business of each Restricted Person are (and for the preceding
five years have been) located at the address of US Borrower set out in Section
10.3.  Except as indicated in the Disclosure Schedule or otherwise disclosed in
writing to the Administrative Agent, no Restricted Person has any other office
or place of business.

     Section 5.15.  Borrower's Subsidiaries.  Borrower does not presently have
                    -----------------------
any Subsidiary or own any stock in any other corporation or association except
those listed in the Disclosure Schedule or hereafter disclosed to Administrative
Agent in writing.  Neither Borrower nor any Restricted Person is a member of any
general or limited partnership, limited liability company, joint venture or
association of any type whatsoever except those listed in the Disclosure
Schedule

                                      76
<PAGE>

or hereafter disclosed to Administrative Agent in writing. Borrower owns,
directly or indirectly, the equity interest in each of its Subsidiaries which is
indicated in the Disclosure Schedule.

     Section 5.16.  Title to Properties; Licenses.  Each Restricted Person has
                    -----------------------------
good and defensible title to all of its material properties and assets, free and
clear of all Liens other than Permitted Liens and of all impediments to the use
of such properties and assets in such Restricted Person's business.  Each
Restricted Person possesses all licenses, permits, franchises, patents,
copyrights, trademarks and trade names, and other intellectual property (or
otherwise possesses the right to use such intellectual property without
violation of the rights of any other Person) which are necessary to carry out
its business as presently conducted and as presently proposed to be conducted
hereafter, and no Restricted Person is in violation in any material respect of
the terms under which it possesses such intellectual property or the right to
use such intellectual property.

     Section 5.17.  Government Regulation.  Neither US Borrower, Term Borrower,
                    ---------------------
Canadian Revolver Borrower, nor any other Restricted Person owing Obligations is
subject to regulation under the Public Utility Holding Company Act of 1935, the
Investment Company Act of 1940 (as any of the preceding acts have been amended)
or any other Law which regulates the incurring by such Person of Indebtedness,
including Laws relating to common contract carriers or the sale of electricity,
gas, steam, water or other public utility services.  Neither US Borrower, Term
Borrower, Canadian Revolver Borrower, nor any other Restricted Person is subject
to regulation under the Federal Power Act which would violate, result in a
default of, or prohibit the effectiveness or the performance of any of the
provisions of the Loan Documents.

     Section 5.18.  Insider.  No Restricted Person, nor any Person having
                    -------
"control" (as that term is defined in 12 U.S.C. (S) 375b(9) or in regulations
promulgated pursuant thereto) of any Restricted Person, is a "director" or an
"executive officer" or "principal shareholder" (as those terms are defined in 12
U.S.C. (S) 375b(8) or (9) or in regulations promulgated pursuant thereto) of any
Lender, of a bank holding company of which any Lender is a Subsidiary or of any
Subsidiary of a bank holding company of which any Lender is a Subsidiary.

     Section 5.19.  Solvency.  Upon giving effect to the issuance of the Notes,
                    --------
the execution of the Loan Documents by US Borrower, Term Borrower, Canadian
Revolver Borrower, and each Guarantor and the consummation of the transactions
contemplated hereby, (i) US Borrower, Term Borrower, Canadian Revolver Borrower,
and each Guarantor will be solvent (as such term is used in applicable
bankruptcy, liquidation, receivership, insolvency or similar Laws), and the sum
of US Borrower's, Term Borrower's, Canadian Revolver Borrower's, and each
Guarantor's absolute and contingent liabilities, including the Obligations or
guarantees thereof, shall not exceed the fair market value of such Restricted
Person's assets, and (ii) US Borrower's, Term Borrower's, Canadian Revolver
Borrower's, and each Guarantor's capital should be adequate for the businesses
in which such Restricted Person is engaged and intends to be engaged.  Neither
US Borrower, Term Borrower, Canadian Revolver Borrower, nor any Restricted
Person has incurred (whether under the Loan Documents or otherwise), nor does
any Restricted Person intend to incur or believe that it will incur, debts which
will be beyond its ability to pay as such debts mature.

                                      77
<PAGE>

     Section 5.20.  Credit Arrangements.  The Disclosure Schedule contains a
                    -------------------
complete and correct list, as of the date of this Agreement, of each credit
agreement, loan agreement, indenture, purchase agreement, guaranty or other
arrangement providing for or otherwise relating to any Indebtedness or any
extension of credit (or commitment for any extension of credit) to, or guaranty
by, any Restricted Person, or to which any Restricted Person is subject, other
than the Loan Documents, the Marketing Credit Agreement and the "Loan Documents"
as defined therein, and the aggregate principal or face amount outstanding or
which may become outstanding under each such arrangement is correctly described
in the Disclosure Schedule.  No Restricted Person is subject to any restriction
under any credit agreement, loan agreement, indenture, purchase agreement,
guaranty or other arrangement providing for or otherwise relating to any
Indebtedness or any extension of credit (or commitment for any extension of
credit) to, or guaranty by, any Affiliate, other than another Restricted Person.

                      ARTICLE VI - Affirmative Covenants
                                   ---------------------

     To conform with the terms and conditions under which each Lender is willing
to have credit outstanding to US Borrower, Term Borrower, and Canadian Revolver
Borrower, and to induce each Lender to enter into this Agreement and extend
credit hereunder, Plains MLP, US Borrower, Term Borrower, and Canadian Revolver
Borrower, covenant and agree that until the full and final payment of the
Obligations and the termination of this Agreement, unless Majority Lenders, or
all Lenders as required under Section 10.1, have previously agreed otherwise:

     Section 6.1.  Payment and Performance.  Each Restricted Person will pay
                   -----------------------
all amounts due under the Loan Documents, to which it is a party, in accordance
with the terms thereof and will observe, perform and comply with every covenant,
term and condition expressed in the Loan Documents to which it is a party.

     Section 6.2.  Books, Financial Statements and Reports.  Each Restricted
                   ---------------------------------------
Person will at all times maintain full and accurate books of account and
records.  Plains MLP will maintain and will cause its Subsidiaries to maintain a
standard system of accounting, will maintain its Fiscal Year, and will furnish
the following statements and reports to each Lender at Restricted Person's
expense:

          (a)  As soon as available, and in any event within ninety (90) days
     after the end of each Fiscal Year (i) complete Consolidated financial
     statements of Plains MLP together with all notes thereto, prepared in
     reasonable detail in accordance with GAAP, together with an unqualified
     opinion, based on an audit using generally accepted auditing standards, by
     PricewaterhouseCoopers LLP, or other independent certified public
     accountants selected by General Partner and acceptable to Majority Lenders,
     stating that such Consolidated financial statements have been so prepared
     and (ii) supporting unaudited consolidating balance sheets and statements
     of income of each other Restricted Person (except for any Restricted Person
     whose financial statements are substantially the same as those of Plains
     MLP).  These financial statements shall contain a Consolidated and
     consolidating balance sheet as of the end of such Fiscal Year and
     Consolidated and consolidating statements of earnings for such Fiscal Year.
     Such Consolidated financial

                                      78
<PAGE>

     statements shall set forth in comparative form the corresponding figures
     for the preceding Fiscal Year. In addition, within ninety (90) days after
     the end of each Fiscal Year Plains MLP will furnish a certificate signed by
     such accountants (i) stating that they have read this Agreement, (ii)
     containing calculations showing compliance (or non-compliance) at the end
     of such Fiscal Year with the requirements of Sections 7.11 through 7.14,
     inclusive, and (iii) further stating that in making their examination and
     reporting on the Consolidated financial statements described above they
     obtained no knowledge of any Default existing at the end of such Fiscal
     Year, or, if they did so conclude that a Default existed, specifying its
     nature and period of existence.

          (b)  As soon as available, and in any event within forty-five (45)
     days after the end of each of the first three Fiscal Quarters of each
     Fiscal Year, (i) Plains MLP's Consolidated balance sheet as of the end of
     such Fiscal Quarter and Consolidated statements of Plains MLP's earnings
     and cash flows for such Fiscal Quarter and for the period from the
     beginning of the then current Fiscal Year to the end of such Fiscal
     Quarter, and (ii) supporting consolidating balance sheets and statements of
     income of each other Restricted Person (except for any Restricted Person
     whose financial statements are substantially the same as those of Plains
     MLP), all in reasonable detail and prepared in accordance with GAAP,
     subject to changes resulting from normal year-end adjustments; and as soon
     as available, and in any event within forty-five (45) days after the end of
     the last Fiscal Quarter of each Fiscal Year, Plains MLP's unaudited
     Consolidated balance sheet as of the end of such Fiscal Quarter and income
     statement for such Fiscal Quarter and for the period from the beginning of
     the current Fiscal Year to the end of such Fiscal Quarter. In addition
     Plains MLP will, together with each such set of financial statements and
     each set of financial statements furnished under subsection (a) of this
     section, furnish a certificate in the form of Exhibit F signed by the chief
     financial officer, principal accounting officer or treasurer of General
     Partner stating that such financial statements are accurate and complete in
     all material respects (subject to normal year-end adjustments), stating
     that he has reviewed the Loan Documents, containing calculations showing
     compliance (or non-compliance) at the end of such Fiscal Quarter with the
     requirements of Sections 7.11 through 7.14, inclusive and stating that no
     Default exists at the end of such Fiscal Quarter or at the time of such
     certificate or specifying the nature and period of existence of any such
     Default.

          (c)  Promptly upon their becoming available, copies of all financial
     statements, reports, notices and proxy statements sent by Plains MLP to its
     unit holders and all registration statements, periodic reports and other
     statements and schedules filed by Plains MLP with any securities exchange,
     the Securities and Exchange Commission or any similar governmental
     authority.

          (d)  As soon as available, and in any event within ninety (90) days
     after the end of each Fiscal Year, a five-year business and financial plan
     for Plains MLP (in form reasonably satisfactory to Administrative Agent),
     prepared or caused to be prepared by a senior financial officer thereof,
     setting forth for the first year thereof, quarterly financial

                                      79
<PAGE>

     projections and budgets for Plains MLP, and thereafter yearly financial
     projections for the next four Fiscal Years.

          (e)  As soon as available, and in any event within forty-five (45)
     days after the end of each month, throughput volume reports setting forth
     in detail pipeline volumes of Petroleum Products delivered by Restricted
     Persons for such month in connection with, and transportation fees charged
     and margins realized by the Restricted Persons for such month delivered
     through all pipeline facilities of Plains MLP and its Subsidiaries.

          (f)  As soon as available, and in any event within forty-five (45)
     days after the end of each Fiscal Quarter, a report setting forth volumes
     and margins for all marketing activities of Restricted Persons.

          (g)  As soon as available, and in any event within thirty (30) days
     after the end of each Fiscal Year, an environmental compliance certificate
     signed by the president or chief executive officer of General Partner in
     the form attached hereto as Exhibit F. Further, if requested by
     Administrative Agent, Restricted Persons shall permit and cooperate with an
     environmental and safety review made in connection with the operations of
     Restricted Persons' properties one time during each Fiscal Year, by Pilko &
     Associates, Inc. or other consultants selected by Administrative Agent
     which review shall, if requested by Administrative Agent, be arranged and
     supervised by environmental legal counsel for Administrative Agent, all at
     Restricted Persons' cost and expense.  The consultant shall render a verbal
     or written report, as specified by Administrative Agent, based upon such
     review at Restricted Persons' cost and expense and a copy thereof will be
     provided to Restricted Persons.

          (h)  Concurrently with the annual renewal of Restricted Persons'
     insurance policies, Restricted Persons shall at their own cost and expense,
     if requested by Administrative Agent in writing, cause a certificate or
     report to be issued by Administrative Agent's professional insurance
     consultants or other insurance consultants satisfactory to Administrative
     Agent certifying that Restricted Persons' insurance for the next succeeding
     year after such renewal (or for such longer period for which such insurance
     is in effect) complies with the provisions of this Agreement and the
     Security Documents.

          (i)  As soon as available, and in any event within thirty-five (35)
     days after the end of each calendar month, a Consolidated statement of
     Plains MLP's earnings for such calendar month in form satisfactory to
     Administrative Agent.

          (j)  By 10:00 a.m., Boston Massachusetts time, each Monday, a report
     on a mark to market basis of all Floating Rate Contracts as of the close of
     business on the previous Friday, and together with such report a complete
     list of all net realized losses on any Floating Rate Contracts for the
     prior twelve months in form satisfactory to Administrative Agent.

                                      80
<PAGE>

     Section 6.3.  Other Information and Inspections.  In each case subject to
                   ---------------------------------
the last sentence of this Section 6.3, each Restricted Person will furnish to
each Lender any information which Administrative Agent or any Lender may from
time to time request concerning any covenant, provision or condition of the Loan
Documents or any matter in connection with Restricted Persons' businesses and
operations. In each case subject to the last sentence of this Section 6.3, each
Restricted Person will permit representatives appointed by Administrative Agent
(including independent accountants, auditors, agents, attorneys, appraisers and
any other Persons) to visit and inspect during normal business hours any of such
Restricted Person's property, including its books of account, other books and
records, and any facilities or other business assets, and to make extra copies
therefrom and photocopies and photographs thereof, and to write down and record
any information such representatives obtain, and each Restricted Person shall
permit Administrative Agent or its representatives to investigate and verify the
accuracy of the information furnished to Administrative Agent or any Lender in
connection with the Loan Documents and to discuss all such matters with its
officers, employees and, upon prior notice to US Borrower, Term Borrower, or
Canadian Revolver Borrower, its representatives.  Without limitation of the
foregoing, within one hundred twenty (120) days after the end of each Fiscal
Year, and in addition once during each Fiscal Year, if requested by
Administrative Agent at the instruction of Majority Lenders, US Borrower, Term
Borrower, and Canadian Revolver Borrower, shall permit commercial financial
examiners appointed by Administrative Agent to conduct a commercial finance
examination of the business and assets of Restricted Persons and in connection
with such examination to have full access to and the right to examine, audit,
make abstracts and copies from, and inspect Restricted Persons' records, files,
books of account and all other documents, instruments and agreements to which a
Restricted Person is a party.  US Borrower, Term Borrower, or Canadian Revolver
Borrower, shall pay all reasonable costs and expenses of Administrative Agent
associated with any such examination.  Each of the foregoing inspections and
examinations shall be made subject to compliance with applicable safety
standards and the same conditions applicable to any Restricted Person in respect
of property of that Restricted Person on the premises of Persons other than a
Restricted Person or an Affiliate of a Restricted Person, and all information,
books and records furnished or requested to be furnished, or of which copies,
photocopies or photographs are made or requested to be made, all information to
be investigated or verified and all discussions conducted with any officer,
employee or representative of any Restricted Person shall be subject to any
applicable attorney-client privilege exceptions which the Restricted Person
determines is reasonably necessary and compliance with conditions to disclosures
under non-disclosure agreements between any Restricted Person and Persons other
than a Restricted Person or an Affiliate of a Restricted Person and the express
undertaking of each Person acting at the direction of or on behalf of any Lender
Party to be bound by the confidentiality provisions of Section 10.6 of this
Agreement.

     Section 6.4.  Notice of Material Events and Change of Address.  Each
                   -----------------------------------------------
Restricted Person will notify each Lender Party, not later than five (5)
Business Days after any executive officer of Restricted Persons has knowledge
thereof, stating that such notice is being given pursuant to this Agreement, of:

          (a)  the occurrence of any Material Adverse Change,

                                      81
<PAGE>

          (b)  the occurrence of any Default,

          (c)  the acceleration of the maturity of any Indebtedness owed by any
     Restricted Person or of any default by any Restricted Person under any
     indenture, mortgage, agreement, contract or other instrument to which any
     of them is a party or by which any of them or any of their properties is
     bound, if such acceleration or default could cause a Material Adverse
     Change,

          (d)  the occurrence of any Termination Event,

          (e)  Under any Environmental Law, any claim of the Dollar Equivalent
     of $1,000,000 or more, any notice of potential liability which might be
     reasonably likely to exceed such amount, or any other material adverse
     claim asserted against any Restricted Person or with respect to any
     Restricted Person's properties taken as a whole, and

          (f)  the filing of any suit or proceeding, or the assertion in writing
     of a claim against any Restricted Person or with respect to any Restricted
     Person's properties in which an adverse decision reasonably could be
     expected to cause a Material Adverse Change.

Upon the occurrence of any of the foregoing Restricted Persons will take all
necessary or appropriate steps to remedy promptly any such Material Adverse
Change, Default, acceleration, default or Termination Event, to protect against
any such adverse claim, to defend any such suit or proceeding, and to resolve
all controversies on account of any of the foregoing.  Restricted Persons will
also notify Administrative Agent and Administrative Agent's counsel in writing
at least twenty Business Days prior to the date that any Restricted Person
changes its name or the location of its chief executive office or principal
place of business or the place where it keeps its books and records concerning
the Collateral, furnishing with such notice any necessary financing statement
amendments or requesting Administrative Agent and its counsel to prepare the
same.

     Section 6.5.  Maintenance of Properties.  Each Restricted Person will
                   -------------------------
maintain, preserve, protect, and keep all Collateral and all other property used
or useful in the conduct of its business in good condition (ordinary wear and
tear excepted) and in compliance with all applicable Laws, and will from time to
time make all repairs, renewals and replacements needed to enable the business
and operations carried on in connection therewith to be promptly and
advantageously conducted at all times.

     Section 6.6.  Maintenance of Existence and Qualifications.  Each
                   -------------------------------------------
Restricted Person will maintain and preserve its existence and its rights and
franchises in full force and effect and will qualify to do business in all
states or jurisdictions where required by applicable Law, except where the
failure so to qualify will not cause a Material Adverse Change.

     Section 6.7.  Payment of Trade Liabilities, Taxes, etc.  Each Restricted
                   -----------------------------------------
Person will (a) timely file all required tax returns (including any extensions);
(b) timely pay all taxes, assessments, and other governmental charges or levies
imposed upon it or upon its income,

                                      82
<PAGE>

profits or property; (c) within one hundred twenty (120) days after the date
such goods are delivered or such services are rendered, pay all Liabilities owed
by it on ordinary trade terms to vendors, suppliers and other Persons providing
goods and services used by it in the ordinary course of its business; (d) pay
and discharge when due all other Liabilities now or hereafter owed by it, other
than royalty payments suspended in the ordinary course of business; and (e)
maintain appropriate accruals and reserves for all of the foregoing in
accordance with GAAP. Each Restricted Person may, however, delay paying or
discharging any of the foregoing so long as it is in good faith contesting the
validity thereof by appropriate proceedings, if necessary, and has set aside on
its books adequate reserves therefor which are required by GAAP.

     Section 6.8.  Insurance.  Each Restricted Person shall at all times
                   ---------
maintain insurance for its property in accordance with the Insurance Schedule,
which insurance shall be by financially sound and reputable insurers.  Each
Restricted Person will maintain any additional insurance coverage as described
in the respective Security Documents.  Upon demand by Administrative Agent any
insurance policies covering Collateral shall be endorsed (a) to provide for
payment of losses to Administrative Agent as its interests may appear, (b) to
provide that such policies may not be canceled or reduced or affected in any
material manner for any reason without fifteen days prior notice to
Administrative Agent, and (c) to provide for any other matters specified in any
applicable Security Document or which Administrative Agent may reasonably
require.  Each Restricted Person shall at all times maintain insurance against
its liability for injury to persons or property in accordance with the Insurance
Schedule, which insurance shall be by financially sound and reputable insurers.
Without limiting the foregoing, each Restricted Person shall at all time
maintain liability insurance in accordance with the Insurance Schedule.

     Section 6.9.  Performance on Borrower's Behalf.  If any Restricted Person
                   --------------------------------
fails to pay any taxes, insurance premiums, expenses, attorneys' fees or other
amounts it is required to pay under any Loan Document, Administrative Agent may
pay the same after notice of such payment by Administrative Agent is given to US
Borrower.  US Borrower shall immediately reimburse Administrative Agent for any
such payments and each amount paid by Administrative Agent shall constitute an
Obligation owed hereunder which is due and payable on the date such amount is
paid by Administrative Agent.

     Section 6.10. Interest.  Each of US Borrower, Term Borrower, and Canadian
                   --------
Revolver Borrower hereby promises to each Lender to pay interest at the Default
Rate on all Obligations (including Obligations to pay fees or to reimburse or
indemnify any Lender) which such Person has in this Agreement promised to pay to
such Lender and which are not paid when due.  Such interest shall accrue from
the date such Obligations become due until they are paid.

     Section 6.11. Compliance with Agreements and Law.  Each Restricted Person
                   ----------------------------------
will perform all material obligations it is required to perform under the terms
of each indenture, mortgage, deed of trust, security agreement, lease, and
franchise, and each material agreement, contract or other instrument or
obligation to which it is a party or by which it or any of its properties is
bound.  Each Restricted Person will conduct its business and affairs in
compliance with all Laws applicable thereto.

                                      83
<PAGE>

     Section 6.12.  Environmental Matters; Environmental Reviews.
                    --------------------------------------------

          (a)  Each Restricted Person will comply in all material respects with
     all Environmental Laws now or hereafter applicable to such Restricted
     Person as well as all contractual obligations and agreements with respect
     to environmental remediation or other environmental matters, and shall
     obtain, at or prior to the time required by applicable Environmental Laws,
     all environmental, health and safety permits, licenses and other
     authorizations necessary for its operations and will maintain such
     authorizations in full force and effect.

          (b)  Each Restricted Person will promptly furnish to Administrative
     Agent all written notices of violation, orders, claims, citations,
     complaints, penalty assessments, suits or other proceedings received by any
     Restricted Person or General Partner, or of which it has notice, pending or
     threatened against any Restricted Person, the potential liability of which
     exceeds the Dollar Equivalent of $1,000,000 or would cause a Material
     Adverse Change if resolved adversely against any Restricted Person, by any
     governmental authority with respect to any alleged violation of or non-
     compliance with any Environmental Laws or any permits, licenses or
     authorizations in connection with its ownership or use of its properties or
     the operation of its business.

          (c)  Each Restricted Person will promptly furnish to Administrative
     Agent all requests for information, notices of claim, demand letters, and
     other notifications, received by any Restricted Person or General Partner
     in connection with its ownership or use of its properties or the conduct of
     its business, relating to potential responsibility with respect to any
     investigation or clean-up of Hazardous Material at any location, the
     potential liability of which exceeds the Dollar Equivalent of $1,000,000 or
     would cause a Material Adverse Change if resolved adversely against any
     Restricted Person.

     Section 6.13.  Evidence of Compliance.  Subject to the last sentence of
                    ----------------------
Section 6.3, each Restricted Person will furnish to each Lender at such
Restricted Person's expense all evidence which Administrative Agent from time to
time reasonably requests in writing as to the accuracy and validity of or
compliance with all representations, warranties and covenants made by any
Restricted Person in the Loan Documents, the satisfaction of all conditions
contained therein, and all other matters pertaining thereto.

     Section 6.14.  Agreement to Deliver Security Documents.  Restricted
                    ---------------------------------------
Persons will deliver to further secure the Obligations whenever requested by
Administrative Agent in its sole and absolute discretion, deeds of trust,
mortgages, chattel mortgages, security agreements, financing statements and
other Security Documents in form and substance satisfactory to Administrative
Agent for the purpose of granting, confirming, and perfecting first and prior
liens or security interests in any real or personal property now owned or
hereafter acquired by any Restricted Person.

     Section 6.15.  Perfection and Protection of Security Interests and Liens.
                    ---------------------------------------------------------
Each Restricted Person will from time to time deliver to Administrative Agent
any financing statements,

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<PAGE>

continuation statements, extension agreements and other documents, properly
completed and executed (and acknowledged when required) by Restricted Persons in
form and substance satisfactory to Administrative Agent, which Administrative
Agent requests for the purpose of perfecting, confirming, or protecting any
Liens or other rights in Collateral securing any Obligations.

     Section 6.16.  Bank Accounts; Offset.  To secure the repayment of the
                    ---------------------
Obligations, each Restricted Person hereby grants to each Lender a security
interest, a lien, and a right of offset, each of which shall be in addition to
all other interests, liens, and rights of any Lender at common Law, under the
Loan Documents, or otherwise, and each of which shall be upon and against (a)
any and all moneys, securities or other property (and the proceeds therefrom) of
such Restricted Person now or hereafter held or received by or in transit to any
Lender from or for the account of such Restricted Person, whether for
safekeeping, custody, pledge, transmission, collection or otherwise, (b) any and
all deposits (general or special, time or demand, provisional or final) of such
Restricted Person with any Lender, and (c) any other credits and claims of such
Restricted Person at any time existing against any Lender, including claims
under certificates of deposit.  At any time and from time to time during the
continuance of any Event of Default, each Lender is hereby authorized to
foreclose upon, or to offset against the Obligations then due and payable (in
either case without notice to any Restricted Person), any and all items herein
above referred to.  The remedies of foreclosure and offset are separate and
cumulative, and either may be exercised independently of the other without
regard to procedures or restrictions applicable to the other.

     Section 6.17.  Guaranties of Subsidiaries.  Each Subsidiary of Plains MLP
                    --------------------------
now existing or created, acquired or coming into existence after the date hereof
shall, promptly upon request by Administrative Agent, execute and deliver to
Administrative Agent an absolute and unconditional guaranty of the timely
repayment of the Obligations and the due and punctual performance of the
obligations of US Borrower, Term Borrower, and Canadian Revolver Borrower
hereunder (in each case for which such Subsidiary is not a borrower, account
party or similar primary and direct obligor), which guaranty shall be
satisfactory to Administrative Agent in form and substance.  Each Subsidiary of
Plains MLP existing on the date hereof shall duly execute and deliver such a
guaranty prior to the making of any Loan hereunder (in each case for which such
Subsidiary is not a borrower, account party or similar primary and direct
obligor). Plains MLP will cause each of its Subsidiaries to deliver to
Administrative Agent, simultaneously with its delivery of such a guaranty,
written evidence satisfactory to Administrative Agent and its counsel that such
Subsidiary has taken all corporate, limited liability company or partnership
action necessary to duly approve and authorize its execution, delivery and
performance of such guaranty and any other documents which it is required to
execute.

     Section 6.18.  Compliance with Agreements.  Each Restricted Person shall
                    --------------------------
observe, perform or comply with any agreement with any Person or any term or
condition of any instrument, if such agreement or instrument is materially
significant to such Restricted Person or to Restricted Persons on a Consolidated
basis or materially significant to any Guarantor, unless

                                      85
<PAGE>

any such failure to so observe, perform or comply is remedied within the
applicable period of grace (if any) provided in such agreement or instrument.

     Section 6.19.  Rents.  By the terms of the various Security Documents,
                    -----
certain Restricted Persons are and will be assigning to Administrative Agent,
for the benefit of Lender Parties, all of the "Rents" (as defined therein)
accruing to the property covered thereby.  Notwithstanding any such assignments,
so long as no Default has occurred and is continuing, (i) such Restricted
Persons may continue to receive and collect from the payors of such Rents all
such Rents, subject, however, to the Liens created under the Security Documents,
which Liens are hereby affirmed and ratified, and free and clear of such Liens,
use the proceeds of the Rents, and (ii) the Administrative Agent will not notify
the obligors of such Rents or take any other action to cause proceeds thereof to
be remitted to the Administrative Agent. Upon the occurrence of a Default,
Administrative Agent may exercise all rights and remedies granted under the
Security Documents, including the right to obtain possession of all Rents then
held by such Restricted Persons or to receive directly from the payors of such
Rents all other Rents until such time as such Default is no longer continuing.
If the Administrative Agent shall receive any Rent proceeds from any payor at
any time other than during the continuance of a Default, then it shall notify US
Borrower thereof and (i) upon request and pursuant to the instructions of US
Borrower, it shall, if no Default is then continuing, remit such proceeds to US
Borrower and (ii) at the request and expense of US Borrower, execute and deliver
a letter to such payors confirming Restricted Persons' right to receive and
collect Rents until otherwise notified by Administrative Agent.  In no case
shall any failure, whether purposed or inadvertent, by Administrative Agent to
collect directly any such Rents constitute in any way a waiver, remission or
release of any of its rights under the Security Documents, nor shall any release
of any Rents by Administrative Agent to such Restricted Persons constitute a
waiver, remission, or release of any other Rents or of any rights of
Administrative Agent to collect other Rents thereafter.

     Section 6.20.  Working Capital Borrowings.  For an economically meaningful
                    --------------------------
period of time in each Fiscal Year, as reasonably determined by the General
Partner, the aggregate outstanding principal balance of all Working Capital
Borrowings shall be reduced to a relatively small amount as may be reasonably
specified by the General Partner.

     Section 6.21.  Canadian Revolver Advances.  For at least one Business Day
                    --------------------------
each year during the Canadian Commitment Period, the outstanding principal
balance of the Canadian Revolver Advances (not including any Canadian Revolver
Advances made in respect of Canadian Cash and Carry Purchases or margin
deposits) will not exceed the Dollar Equivalent of $5,000,000.

                       ARTICLE VII - Negative Covenants
                                     ------------------

     To conform with the terms and conditions under which each Lender is willing
to have credit outstanding to US Borrower, Term Borrower, and Canadian Revolver
Borrower and to induce each Lender to enter into this Agreement and make the
Loans, Plains, US Borrower, Term Borrower, and Canadian Revolver Borrower
covenant and agree that until the full and final

                                      86
<PAGE>

payment of the Obligations and the termination of this Agreement, unless
Majority Lenders, or all Lenders as required under Section 10.1, have previously
agreed otherwise:

     Section 7.1.  Indebtedness.  No Restricted Person will in any manner owe
                   ------------
or be liable for Indebtedness except:

     (a)  the Obligations;

     (b)  Indebtedness arising under Hedging Contracts (i) permitted under
Section 7.3 or (ii) consisting of options, swaps, collars and similar
instruments that relate to Petroleum Products and are either referred to in any
of clauses (i) - (iii) of Section 7.15(a) or permitted by Section 7.15(b) or
(c);

     (c)  Indebtedness of any Restricted Person owing to another Restricted
Person;

     (d)  Liabilities with respect to obligations to deliver Petroleum Products
or to render terminaling or storage services in consideration for advance
payments to a Restricted Person provided such delivery or rendering, as
applicable, is to be made within 60 days (or, as to liquefied petroleum gases,
within 365 days) after such payment;

     (e)  Indebtedness under the Marketing Credit Agreement, provided that the
principal amount of loans and face amount of letters of credit thereunder at any
one time outstanding shall not exceed $300,000,000;

     (f)  guaranties by Plains MLP, any Borrower or any Guarantor of trade
payables of any other Restricted Person incurred and paid in the ordinary course
of business on ordinary trade terms;

     (g)  Indebtedness owing by Plains MLP or any other Restricted Person under
its senior unsecured privately placed or public term Indebtedness (and any
Indebtedness issued in exchange therefor), provided (1) such Indebtedness shall
not permit optional redemption by the issuer or mandatory redemption by any
holder thereof solely at the option of any such holder, nor any stated maturity,
in each case prior to the Maturity Date, (2) the indenture governing such
Indebtedness shall have no covenants or other requirements more onerous than the
Loan Documents, (3) the aggregate outstanding face amount of such Indebtedness
shall not exceed $400,000,000, (4) all of the net proceeds of such originally
issued Indebtedness shall be used to repay US Loans, (5) upon the receipt of net
proceeds from the original issuance of such Indebtedness, the US Commitment
shall be reduced by an amount equal to (A) forty percent (40%) of the face
amount of such Indebtedness, if the aggregate face amount is less than
$350,000,000, or (B) fifty percent (50%) of the face amount of such
Indebtedness, if the aggregate face amount of such Indebtedness is equal to or
greater than $350,000,000, and (6) both immediately prior to and immediately
following the consummation of such offering, no Default or Event of Default
shall have occurred and be continuing; and

                                      87
<PAGE>

     (h)  other Indebtedness not to exceed in the aggregate in respect of all
Restricted Persons the principal amount of the Dollar Equivalent of $25,000,000
at any one time outstanding; provided, no such other Indebtedness under this
clause (h) in respect of borrowed money (1) by Canadian Revolver Borrower shall
exceed in the aggregate the principal amount of $10,000,000 at any one time
outstanding, or (2) by a Restricted Person other than US Borrower, Canadian
Revolver Borrower or Restricted Persons acquired after the date hereof shall
exceed in the aggregate the principal amount of $5,000,000 at any one time
outstanding.

     Section 7.2.  Limitation on Liens.  No Restricted Person will create,
                   -------------------
assume or permit to exist any Lien upon any of the properties or assets which it
now owns or hereafter acquires, except the following ("Permitted Liens"):

          (a)  Liens created pursuant to this Agreement or the Security
     Documents and Liens existing on the date of this Agreement and listed in
     the Disclosure Schedule or Liens created pursuant to the Marketing Credit
     Agreement or the "Security Documents" as defined in the Marketing Credit
     Agreement, subject to the terms of the Intercreditor Agreement referred to
     in Section 4.1(m).

          (b)  Liens imposed by any governmental authority for taxes,
     assessments or charges not yet due or the validity of which is being
     contested in good faith and by appropriate proceedings, if necessary, for
     which adequate reserves are maintained on the books of any Restricted
     Person in accordance with GAAP;

          (c)  pledges or deposits of cash or securities under worker's
     compensation, unemployment insurance or other social security legislation;

          (d)  carriers', warehousemen's, mechanics', materialmen's,
     repairmen's, landlord's, or other like Liens (including without limitation,
     Liens on property of any Restricted Person in the possession of storage
     facilities, pipelines or barges) arising in the ordinary course of business
     for amounts which are not more than 60 days past due or the validity of
     which is being contested in good faith and by appropriate proceedings, if
     necessary, and for which adequate reserves are maintained on the books of
     any Restricted Person in accordance with GAAP;

          (e)  Liens under or with respect to accounts with brokers or
     counterparties with respect to Hedging Contracts consisting of cash,
     commodities or futures contracts, options, securities, instruments, and
     other like assets securing only Hedging Contracts permitted under Section
     7.1;

          (f)  deposits of cash or securities to secure the performance of bids,
     trade contracts (other than for borrowed money), leases, statutory
     obligations, surety and appeal bonds, performance bonds and other
     obligations of a like nature incurred in the ordinary course of business;

                                      88
<PAGE>

          (g)  easements, rights-of-way, restrictions and other similar
     encumbrances incurred in the ordinary course of business and encumbrances
     consisting of zoning restrictions, easements, licenses, restrictions on the
     use of real property or minor imperfections in title thereto which, in the
     aggregate, are not material in amount, and which do not in any case
     materially detract from the value of the property subject thereto or
     interfere with the ordinary conduct of the business of any Restricted
     Person;

          (h)  Liens in respect of operating leases and Capital Leases permitted
     under Section 7.1;

          (i)  Liens upon any property or assets acquired after the date hereof
     by a Restricted Person, each of which either (i) existed on such property
     or asset before the time of its acquisition and was not created in
     anticipation thereof, or (ii) was created solely for the purpose of
     securing Indebtedness representing, or incurred to finance, refinance or
     refund, the cost (including the cost of construction) of such property or
     asset; provided that no such Lien shall extend to or cover any property or
     asset of a Restricted Person other than the property or asset so acquired
     (or constructed) and the Indebtedness secured thereby is permitted under
     Section 7.1(g) hereof; and any extension, renewal, refinancing, refunding
     or replacement (or successive extensions, renewals, refinancings,
     refundings or replacements), in whole or part, of the foregoing, provided,
     however, that such Liens shall not cover or secure any additional
     Indebtedness, obligations, property or asset;

          (j)  rights reserved to or vested in any governmental authority by the
     terms of any right, power, franchise, grant, license or permit, or by any
     provision of law, to revoke or terminate any such right, power, franchise,
     grant, license or permit or to condemn or acquire by eminent domain or
     similar process;

          (k)  rights reserved to or vested by Law in any governmental authority
     to in any manner, control or regulate in any manner any of the properties
     of any Restricted Person or the use thereof or the rights and interests of
     any Restricted Person therein, in any manner under any and all Laws;

          (l)  rights reserved to the grantors of any properties of any
     Restricted Person, and the restrictions, conditions, restrictive covenants
     and limitations, in respect thereto, pursuant to the terms, conditions and
     provisions of any rights-of-way agreements, contracts or other agreements
     therewith;

          (m)  inchoate Liens in respect of pending litigation or with respect
     to a judgment which has not resulted in an Event of Default under Section
     8.1; and

          (n)  Liens on property of US Borrower permitted pursuant to the terms
     of the Marketing Credit Agreement.

                                      89
<PAGE>

     Section 7.3.  Hedging Contracts.  No Restricted Person will be a party to
                   -----------------
or in any manner be liable on any Hedging Contract, except:

          (a)  Hedging Contracts entered into by a Restricted Person with the
     purpose and effect of fixing interest rates on a principal amount of
     indebtedness of such Restricted Person that is accruing interest at a
     variable rate, provided that (i) the aggregate notional amount of such
     contracts never exceeds one hundred percent (100%) of the anticipated
     outstanding principal balance of the indebtedness to be hedged by such
     contracts or an average of such principal balances calculated using a
     generally accepted method of matching interest swap contracts to declining
     principal balances, (ii) the floating rate index of each such contract
     generally matches the index used to determine the floating rates of
     interest on the corresponding indebtedness to be hedged by such contract
     and (iii) each such contract is with a counterparty or has a guarantor of
     the obligation of the counterparty who (unless such counterparty is a
     Lender, a "Lender" as such term is defined in the Marketing Credit
     Agreement, or an Affiliate of a Lender or "Lender" at the time such
     contract is entered into) at the time the contract is made has long-term
     unsecured and unenhanced debt obligations rated A or A2 or better,
     respectively, by either Rating Agency or is otherwise acceptable to
     Majority Lenders.

          (b)  Hedging Contracts entered into by a Canadian Subsidiary (or by a
     Restricted Person on behalf of a Canadian Subsidiary) with the purpose and
     effect of fixing foreign exchange rates on its reasonably anticipated net
     revenues, and not for speculative purposes, provided that (i) no such
     contract fixes an exchange rate for a term of more than 5 years, (ii) the
     aggregate notional amount of such contracts (determined, in the case of
     contracts that are not settled on a monthly basis, by a monthly proration
     acceptable to Administrative Agent) for any single month never exceeds (A)
     ninety percent (90%) of the reasonably anticipated net revenues to be
     hedged by such contracts plus (B) one hundred percent (100%) of the
     anticipated outstanding principal balance of the indebtedness to be hedged
     by such contracts, and (iii) each such contract is with a counterparty or
     has a guarantor of the obligation of the counterparty who (unless such
     counterparty is a Lender, a "Lender" as such term is defined in the
     Marketing Credit Agreement, or an Affiliate of a Lender or "Lender" at the
     time such contract is entered into) at the time the contract is made has
     long-term unsecured and unenhanced debt obligations rated A or A2 or
     better, respectively, by either Rating Agency or is otherwise acceptable to
     Majority Lenders.

          (c)  Hedging Contracts relating to heating oil used to hedge price
     risk for fuel requirements of the truck fleet of a Restricted Person in the
     ordinary course of business.

     Section 7.4.  Limitation on Mergers, Issuances of Securities.  Except as
                   ----------------------------------------------
expressly provided in this section, no Restricted Person will (a) enter into any
transaction of merger or consolidation or amalgamation, or liquidate, wind up or
dissolve itself (or suffer any liquidation or dissolution), (b) acquire any
business or property from, or capital stock of, or be a party to any acquisition
of, any Person except for purchases of inventory and other property to be sold
or used in the ordinary course of business and Investments permitted under
Section 7.7 hereof or (c) sell,

                                      90
<PAGE>

transfer, lease, exchange, alienate or otherwise dispose of, in one transaction
or a series of transactions, any part of its business or property, whether now
owned or hereafter acquired, except for sales or transfers not prohibited by
under Section 7.5 hereof. Any Person, other than US Borrower, Term Borrower, or
Canadian Revolver Borrower that is a Subsidiary of a Restricted Person may,
however, be merged into or consolidated with (i) another Subsidiary of such
Restricted Person, so long as a Guarantor is the surviving business entity, or
(ii such Restricted Person, so long as such Restricted Person is the surviving
business entity. Plains MLP will not issue any securities other than (i) limited
partnership interests and any options or warrants giving the holders thereof
only the right to acquire such interests, (ii) general or subordinate
partnership interests issued to Resources or a Wholly Owned Subsidiary of
Resources and (iii) debt securities permitted by Section 7.1(g). No Subsidiary
of Plains MLP will issue any additional shares of its capital stock or other
securities or any options, warrants or other rights to acquire such additional
shares or other securities except a Subsidiary of a Restricted Person may issue
additional shares or other securities to such Restricted Person, to Plains MLP
or to General Partner so long as such Subsidiary is a Wholly Owned Subsidiary of
Plains MLP after giving effect thereto. No Subsidiary of US Borrower, Term
Borrower, or Canadian Revolver Borrower which is a partnership will allow any
diminution of Plains MLP's interest (direct or indirect) therein.
Notwithstanding the foregoing, Canadian Revolver Borrower may issue limited
partner interests to CanPet Energy Group (USA), Inc. or CanPet Energy Group Inc.
to effect the consummation of the CanPet Acquisition as set forth in the CanPet
Acquisition Documents, provided, such limited partner interests shall:
                       --------

          (i)   pay no cash dividend nor entitle the holder thereof to any cash
     distribution, except upon dissolution (provided that the foregoing shall
     not prevent the accrual of any such dividends or distributions);

          (ii)  not entitle the holder thereof to any right to manage or control
     Canadian Revolver Borrower or vote with respect thereto; and

          (iii) not be redeemable or exchangeable by the holder thereof for
     cash or callable or subject to a put option for cash at the option of any
     such holder.

     Section 7.5.  Limitation on Sales of Property.  No Restricted Person will
                   -------------------------------
sell, transfer, lease, exchange, alienate or dispose of any Collateral or any of
its material assets or properties or any material interest therein except:

     (a)  equipment which is worthless or obsolete or no longer necessary or
useful to the proper conduct of its business or which is replaced by equipment
of equal suitability and value;

     (b)  inventory (including pipeline linefill) which is sold in the ordinary
course of business on ordinary trade terms;

     (c)  in other property which is sold for fair consideration not in the
aggregate in excess of the Dollar Equivalent of $10,000,000 in any Fiscal Year,
the sale of which will not materially

                                      91
<PAGE>

impair or diminish the value of the Collateral or any Restricted Person's
financial condition, business or operations; and

     (d)  sales or transfers, subject to the Security Documents, by a Person
(other than US Borrower) that is a Subsidiary of a Restricted Person to such
Restricted Person or to a Wholly Owned Subsidiary of such Restricted Person that
is a Guarantor.

No Restricted Person will sell, transfer or otherwise dispose of capital stock
of or interest in any of its Subsidiaries except to Plains MLP or a Wholly Owned
Subsidiary of Plains MLP; provided, in the event any limited partner interests
issued by Canadian Revolver Borrower to CanPet Energy Group (USA), Inc. or
CanPet Energy Group Inc. pursuant to Section 7.4 are exchanged for units issued
by Plains MLP, Lenders hereby consent to the contribution by Plains MLP to US
Borrower of any and all such partnership interests.  No Restricted Person will
discount, sell, pledge or assign any notes payable to it, accounts receivable or
future income.  So long as no Default then exists, Administrative Agent will, at
US Borrower's request and expense, execute a release, satisfactory to the
relevant Borrower and Administrative Agent, of any Collateral so sold,
transferred, leased, exchanged, alienated or disposed of pursuant to the clause
(a) or (c) of this Section.

     Section 7.6.  Limitation on Dividends and Redemptions.  No Restricted
                   ---------------------------------------
Person will declare or pay any dividends on, or make any other distribution in
respect of, any class of its capital stock or any partnership, limited liability
company or other interest in it, nor will any Restricted Person directly or
indirectly make any capital contribution of any nature to or purchase, redeem,
acquire or retire any shares of the capital stock of or partnership or limited
liability company interests in any Restricted Person (whether such interests are
now or hereafter issued, outstanding or created), or cause or permit any
reduction or retirement of the capital stock of any Restricted Person, while any
Loan or any US Commitment or any Canadian Commitment is outstanding.
Notwithstanding the foregoing, but subject to Section 7.5, (i) Subsidiaries of
Plains MLP, US Borrower, Term Borrower, Canadian Revolver Borrower or of any
Guarantor shall not be restricted, directly or indirectly, from declaring and
paying dividends or making any other distributions to Plains MLP, US Borrower,
Term Borrower, Canadian Revolver Borrower or any such Guarantor, respectively,
and to the General Partner pursuant to and in accordance with such Subsidiary's
partnership agreement, (ii) no Restricted Person shall be restricted from making
capital contributions of any nature to a Wholly Owned Subsidiary of such
Restricted Person that is a Guarantor, and (iii) so long as no Default or Event
of Default has occurred and is continuing or would result therefrom, Plains MLP
shall not be restricted from (A) distributing Available Cash (other than amounts
required to be applied as otherwise required in any Loan Document) to its
partners in accordance with the Partnership Agreement or (B) purchasing its
partnership units on the open market in connection with the Incentive and Option
Plans.

     Section 7.7.  Limitation on Investments and New Businesses.  No Restricted
                   --------------------------------------------
Person will (a) make any expenditure or commitment or incur any obligation or
enter into or engage in any transaction except in the ordinary course of
business, (b) engage directly or indirectly in any business or conduct any
operations except in connection with or incidental to its present businesses and
operations, (c) make any acquisitions of or capital contributions to or other

                                      92
<PAGE>

Investments in any Person, other than Permitted Investments and Permitted
Acquisitions, or (d) make any acquisitions of properties other than Permitted
Acquisitions.  All transactions permitted under the foregoing subsections (a)
through (d), inclusive, are subject to Section 7.5.

     Section 7.8.  Limitation on Credit Extensions.  Except for Permitted
                   -------------------------------
Investments and Hedging Contracts permitted under Section 7.3(b) hereof, no
Restricted Person will extend credit, make advances or make loans other than
normal and prudent extensions of credit to customers buying goods and services
in the ordinary course of business or to another Restricted Person in the
ordinary course of business, which extensions shall not be for longer periods
than those extended by similar businesses operated in a normal and prudent
manner.

     Section 7.9.  Transactions with Affiliates.  No Restricted Person will
                   ----------------------------
engage in any material transaction with any of its Affiliates except: (a)
transactions among Plains MLP and Wholly Owned Subsidiaries of Plains MLP,
subject to the other provisions of this Agreement, (b) transactions governed by
the Affiliate Agreements, and (c) transactions entered into in the ordinary
course of business of such Restricted Person on terms which are no less
favorable to such Restricted Person than those which would have been obtainable
at the time in arm's-length transactions with Persons other than such
Affiliates.

     Section 7.10. Prohibited Contracts.  Except as expressly provided for in
                   --------------------
the Loan Documents and as described in the Disclosure Schedule, no Restricted
Person will, directly or indirectly, enter into, create, or otherwise allow to
exist any contract or other consensual restriction on the ability of any
Subsidiary of Plains MLP, including but not limited to US Borrower, Term
Borrower, Canadian Revolver Borrower and any Subsidiary of such Persons to: (a)
pay dividends or make other distributions to US Borrower, Term Borrower,
Canadian Revolver Borrower or Plains MLP, (b) redeem equity interests held in it
by US Borrower, Term Borrower, Canadian Revolver Borrower or Plains MLP, (c)
repay loans and other indebtedness owing by it to US Borrower, Term Borrower,
Canadian Revolver Borrower or Plains MLP, or (d) transfer any of its assets to
US Borrower, Term Borrower, Canadian Revolver Borrower or Plains MLP.  No
Restricted Person will enter into any "take-or-pay" contract or other contract
or arrangement for the purchase of goods or services which obligates it to pay
for such goods or service regardless of whether they are delivered or furnished
to it other than contracts for pipeline capacity or for services in either case
reasonably anticipated to be utilized in the ordinary course of business.  No
Restricted Persons will amend, modify or release any of the Affiliate
Agreements.  No Restricted Person will amend or permit any amendment to any
contract or lease which releases, qualifies, limits, makes contingent or
otherwise detrimentally affects the rights and benefits of Administrative Agent
or any Lender under or acquired pursuant to any Security Documents.  No ERISA
Affiliate will incur any obligation to contribute to any "multiemployer plan" as
defined in Section 4001 of ERISA that is subject to Title IV of ERISA.

     Section 7.11. Current Ratio.  The ratio of (i) the sum of Plains MLP's
                   -------------
Consolidated current assets plus the excess, if any, of the Total Revolver
Commitment over the Facility Usage to (ii)  Plains MLP's Consolidated current
liabilities will never be less than 1.0 to 1.0.  For purposes of this section,
Plains MLP's Consolidated current liabilities will be calculated without
including (a) any payments of principal on the Notes or Banker's Acceptances or
the notes under

                                      93
<PAGE>

the Marketing Credit Agreement which are required to be repaid within one year
from the time of calculation and (b) all Liabilities arising under permitted
Hedging Contracts. As used in this section, (x) "Total Revolver Commitment"
                                                 -------------------------
means the sum of (1) the Canadian Revolver Commitment plus (2) the US
Commitment, in each case as of the time of determination and (y) "Facility
                                                                  --------
Usage" means, at the time in question, the sum of (1) the Canadian Revolver
-----
Facility Usage plus (2) the US Facility Usage.

     Section 7.12.  Debt Coverage Ratio.  (a) At the end of any Fiscal Quarter,
                    -------------------
(b) on any date on which General Partner declares a distribution permitted under
Section 7.6 and (c) on the date of any Permitted Acquisition, both immediately
prior to and after giving effect to the consummation thereof, the Debt Coverage
Ratio will not be greater than:

          (A)  4.75 to 1.0, in the case of any determination during the period
     from the date hereof through and including September 29, 2001,

          (B)  4.50 to 1.0, in the case of any determination from September 30,
     2001 through and including June 29, 2002,

          (C)  4.25 to 1.0, in the case of any determination from June 30, 2002
     through and including December 30, 2002, and

          (D)  4.00 to 1.0, in the case of any determination thereafter.

As used herein, "Debt Coverage Ratio" means the ratio of (a) Consolidated Funded
                 -------------------
Indebtedness to (b) Consolidated EBITDA for the four Fiscal Quarter period (or
other period specified below) most recently ended prior to the date of
determination for which financial statements contemplated by Section 6.2(a) or
(b) are available to Borrower; provided, for purposes of this Section 7.12, if,
                               --------
since the beginning of the four Fiscal Quarter period ending on the date for
which Consolidated EBITDA is determined, any Restricted Person shall have made
any asset disposition or acquisition, shall have consolidated or merged with or
into any Person (other than another Restricted Person), or shall have made any
disposition or acquisition of a Restricted Person, Consolidated EBITDA shall be
calculated giving pro forma effect thereto as if the disposition, acquisition,
consolidation or merger had occurred on the first day of such period. Such pro
forma effect shall include adjustments with respect to management fees
previously distributed with respect to the assets subject to the CanPet
Acquisition and the acquisition of the remaining 50% of the Manito Pipeline in
mid calendar year 2000, and shall otherwise be determined (i) in good faith by
the chief financial officer of Borrower, and (ii) without giving effect to any
anticipated or proposed change in operations, revenues, expenses or other items
included in the computation of Consolidated EBITDA, except with the consent of
Majority Lenders.

     Section 7.13.  Interest Coverage Ratio.  The ratio of (a) Consolidated
                    -----------------------
EBITDA to (b) Interest Expense for each four Fiscal Quarter period ending on or
after March 31, 2001 will not be less than 2.75 to 1.0.

                                      94
<PAGE>

     Section 7.14.  Debt to Capital Ratio.  The ratio of (a) all Consolidated
                    ---------------------
Funded Indebtedness to (b) the sum of Consolidated Funded Indebtedness plus
Consolidated Net Worth will never be greater than:

          (i)  prior to December 31, 2002, 0.73 to 1.0 at any time; and

          (ii) from and after December 31, 2002, 0.65 to 1.0 at any time.

     Section 7.15.  Open Position; Certain Permitted Financial Instruments;
                    -------------------------------------------------------
NYMEX Transactions.
------------------

          (a)  Open Position.  No Restricted Person shall at any time have any
               -------------
     Open Positions; provided, however, that a Restricted Person may have:

               (i)   Physical inventories of Petroleum Products (A) consisting
          of tank bottoms and pipeline linefill requirements, in each case
          classified as a long-term asset, (B) working inventory of up to
          1,400,000 barrels in the aggregate at any time, (C) excess inventory
          of up to 200,000 barrels in the aggregate at any time resulting from
          crude gathering receipts in excess of scheduled quantities, provided
          that such Restricted Person shall establish an Offsetting Position
          with respect to such quantities within five business days following
          identification of such inventory, but in any event not later than the
          20/th/ day following the month in which such excess volumes were
          received and (D) Hedged Eligible Inventory.

               (ii)  Floating Price Contracts to purchase or sell Petroleum
          Products in the Current Trading Month; provided that, such Floating
          Price Contracts either (A) have an Offsetting Position by the 26th day
          of the month preceding the month of receipt or delivery, or (B) are
          scheduled to be stored at a Plains Terminal or in pipelines Currently
          Approved by Majority Lenders and are hedged in the delivery month with
          NYMEX contracts; and further provided that such Floating Price
          Contracts relating to the sale of Petroleum Products for the Current
          Trading Month do not exceed purchases by more than 15,000 barrels per
          day.

               (iii) Floating Price Contracts to purchase or sell Petroleum
          Products to be received or delivered after the Current Trading Month,
          but within the twelve months following the Current Trading Month
          provided that (A) such contracts are at the then market price and (B)
          at any point in time the sum of (x) net realized losses relating to
          such contracts within the preceding twelve months (excluding
          Physically Covered Near Term Floating Price Contract Losses) and (y)
          mark to market exposure relating to such contracts (excluding
          aggregate mark to market exposure of up to the Dollar Equivalent of
          $20,000,000 relating to Near Term Floating Price Contracts) does not,
          at any time, exceed the Dollar Equivalent of $5,000,000.

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<PAGE>

     As used herein, "Current Trading Month" means (i) with respect to the first
                      ---------------------
     twenty-five days of any calendar month, the next following calendar month
     and (ii) with respect to the period from the 26/th/ day of a calendar month
     through the last day of such month, the second calendar month next
     following such month (for example, for the period from January 26/th/
     through February 25/th/, the Current Trading Month is March), "Floating
                                                                    --------
     Price Contract"  means (i) a purchase or sale contract based upon a daily
     --------------
     index such as a posted price or NYMEX price from time to time in effect
     during the delivery month and (ii) a NYMEX spread transaction in which the
     length of time between the offsetting purchase and sale obligations do not
     exceed twelve months, "Physically Covered Near Term Floating Price Contract
                            ----------------------------------------------------
     Losses" means net realized losses incurred in the Current Trading Month
     ------
     with respect to Near Term Floating Price Contracts entered into prior to
     such Current Trading Month, for which the Company expects to have an
     offsetting physical position in the delivery month originally specified in
     such Near Term Floating Price Contract, and "Near Term Floating Price
                                                  ------------------------
     Contract" means (A) Floating Price Contracts within the First Trading Month
     --------
     following the Current Trading Month, covering volumes up to 60% of
     projected crude gathering receipts for crude under 30-day evergreen
     floating price contracts for the First Trading Month; and (B) Floating
     Price Contracts within the Second Trading Month following the Current
     Trading Month, covering volumes up to 40% of projected crude gathering
     receipts for crude under 30-day evergreen floating price contracts for the
     Second Trading Month.  Using the same example as that used for Current
     Trading Month, the First Trading Month following the Current Trading Month
     for the same period is April and the Second Trading Month following the
     Current Trading Month for the same period is May.

          (b)  Certain Permitted Financial Instruments. No Restricted Person
               ---------------------------------------
     will write (i.e. sell) or otherwise participate in any swap, collar or
     similar agreement relating to Petroleum Products, or write (i.e. sell) any
     option, unless, with respect thereto, (i) such Restricted Person has an
     Offsetting Position in crude volumes for which there is no basis risk
     between such financial instrument and such Offsetting Position and (ii) the
     counter-party (or guarantor to the obligations of such counter-party) at
     the time such financial instrument is made (A) has one or more long term
     unsecured and unenhanced debt obligations rated A or A2 or better,
     respectively, by either Rating Agency, or (B) is a Lender, a "Lender" as
     such term is defined in the Marketing Credit Agreement, or an Affiliate of
     a Lender or "Lender", or (C) is listed in the Disclosure Schedule.

          (c)  NYMEX Transactions.  No Restricted Person will enter in to any
               ------------------
     NYMEX contracts that are time-spread positions to each other, except (i) in
     the case where the sale obligation is in the future month of the purchase
     obligation, where both (A) the length of time between the purchase and sale
     contracts does not exceed thirty-six months and (B) the volume does not in
     the aggregate exceed the lesser of 3,000,000 barrels or 30% of the Plains
     Terminals' storage capacity and (ii) in the case where the purchase
     obligation is in the future month of the sale obligation, where the length
     of time between the sale and purchase contracts does not exceed twelve
     months. No Restricted Person will convert a NYMEX position to a physical
     position by way of an "exchange for physicals" or an "alternative delivery
     procedure"unless the credit extended in connection with such

                                      96
<PAGE>

     physical position would comply with the credit requirements of the
     definition of "Approved Eligible Receivables".

     Section 7.16.  3794865 Canada Ltd.  Notwithstanding anything contained
                    -------------------
herein or in any other Loan Document, 3794865 Canada Ltd., a corporation
organized under Canadian federal law and a wholly-owned Subsidiary of Term
Borrower, shall not: (a) own any assets, other than the Certificate of Public
Convenience and Need issued by the National Energy Board of Canada with respect
to the Wascana pipeline (the "Certificate"), (b) owe or be liable for any
Indebtedness, (c) create, assume or permit to exist any Lien upon any of the
properties or assets which it now owns or hereafter acquires, (d) sell,
transfer, lease, exchange, alienate or dispose of the Certificate or any rights
thereunder or associated therewith, except to Term Borrower or Canadian Revolver
Borrower, (e) engage in any other business activities of any kind, other than
entering into an operating agreement with Canadian Revolver Borrower with
respect to the operation of the Wascana pipeline (the "Wascana Operating
Agreement") and such other activities as may be necessary in order to maintain
and preserve the Certificate and its rights and franchises thereunder in full
force and effect.  Promptly upon any change in applicable Law resulting in Term
Borrower being able to legally hold the Certificate, Term Borrower shall cause
3794865 Canada Ltd. to apply with the appropriate Tribunal for the transfer of
the Certificate to Term Borrower.  No Restricted Person shall make any
Investment in 3794865 Canada Ltd. or enter into any transaction therewith, other
than the Wascana Operating Agreement, the transfer of the Certificate to Term
Borrower, or such other transaction as may be necessary in order to maintain and
preserve the Certificate and the rights and franchises thereunder in full force
and effect.

                 ARTICLE VIII - Events of Default and Remedies
                                ------------------------------

     Section 8.1.  Events of Default.  Each of the following events constitutes
                   -----------------
an Event of Default under this Agreement:

          (a)  Any Restricted Person fails to pay the principal component of any
     Loan or any reimbursement obligation with respect to any Letter of Credit
     when due and payable, whether at a date for the payment of a fixed
     installment or as a contingent or other payment becomes due and payable or
     as a result of acceleration or otherwise;

          (b)  Any Restricted Person fails to pay any Obligation (other than the
     Obligations in subsection (a) above) when due and payable, whether at a
     date for the payment of a fixed installment or as a contingent or other
     payment becomes due and payable or as a result of acceleration or
     otherwise, within three Business Days after the same becomes due;

          (c)  Any event defined as a "default" or "event of default" in any
     Loan Document occurs, and the same is not remedied within the applicable
     period of grace (if any) provided in such Loan Document;

                                      97
<PAGE>

          (d)  Any Restricted Person fails to duly observe, perform or comply
     with any covenant, agreement or provision of Section 6.4 or Article VII;

          (e)  Any Restricted Person fails (other than as referred to in
     subsections (a), (b), (c) or (d) above) to duly observe, perform or comply
     with any covenant, agreement, condition or provision of any Loan Document
     to which it is a party, and such failure remains unremedied for a period of
     thirty (30) days after notice of such failure is given by Administrative
     Agent to US Borrower;

          (f)  Any representation or warranty previously, presently or hereafter
     made in writing by or on behalf of any Restricted Person in connection with
     any Loan Document shall prove to have been false or incorrect in any
     material respect on any date on or as of which made, or any Loan Document
     at any time ceases to be valid, binding and enforceable as warranted in
     Section 5.5 for any reason other than its release or subordination by
     Administrative Agent;

          (g)  Any Restricted Person shall default in the payment when due of
     any principal of or interest on any of its other Indebtedness in excess of
     the Dollar Equivalent of $2,500,000 in the aggregate (other than
     Indebtedness the validity of which is being contested in good faith by
     appropriate proceedings and for which adequate reserves with respect
     thereto are maintained on the books of such Restricted Person in accordance
     with GAAP), or any event specified in any note, agreement, indenture or
     other document evidencing or relating to any such Indebtedness shall occur
     if the effect of such event is to cause, or (with the giving of any notice
     or the lapse of time or both) to permit the holder or holders of such
     Indebtedness (or a trustee or agent on behalf of such holder or holders) to
     cause, such Indebtedness to become due, or to be prepaid in full (whether
     by redemption, purchase, offer to purchase or otherwise), prior to its
     stated maturity;

          (h)  Either (i) any "accumulated funding deficiency" (as defined in
     Section 412(a) of the Code) in excess of $500,000 exists with respect to
     any ERISA Plan, whether or not waived by the Secretary of the Treasury or
     his delegate, or (ii any Termination Event occurs with respect to any ERISA
     Plan and the then current value of such ERISA Plan's benefit liabilities
     exceeds the then current value of such ERISA Plan's assets available for
     the payment of such benefit liabilities by more than $500,000 (or in the
     case of a Termination Event involving the withdrawal of a substantial
     employer, the withdrawing employer's proportionate share of such excess
     exceeds such amount);

          (i)  General Partner or any Restricted Person:

               (i)  has entered against it of a judgment, decree or order for
          relief by a Tribunal of competent jurisdiction in an involuntary
          proceeding commenced under any applicable bankruptcy, insolvency or
          other similar Law of any jurisdiction now or hereafter in effect,
          including the federal Bankruptcy Code, the Bankruptcy and Insolvency
          Act (Canada) or the Companies' Creditors Arrangement Act (Canada), as
          from time to time amended, or has any such

                                      98
<PAGE>

          proceeding commenced against it, in each case, which remains
          undismissed for a period of sixty days; or

               (ii)  commences a voluntary case under any applicable bankruptcy,
          insolvency or similar Law now or hereafter in effect, including the
          federal Bankruptcy Code, the Bankruptcy and Insolvency Act (Canada) or
          the Companies' Creditors Arrangement Act (Canada), as from time to
          time amended; or applies for or consents to the entry of an order for
          relief in an involuntary case under any such Law; or makes a general
          assignment for the benefit of creditors; or is generally unable to pay
          (or admits in writing its inability to so pay) its debts as such debts
          become due; or takes corporate or other action to authorize any of the
          foregoing; or

               (iii) has entered against it the appointment of or taking
          possession by a receiver, liquidator, assignee, custodian, trustee,
          sequestrator or similar official of all or a substantial part of its
          assets in a proceeding brought against or initiated by it, and such
          appointment or taking possession is neither made ineffective nor
          discharged within sixty days after the making thereof, or such
          appointment or taking possession is at any time consented to,
          requested by, or acquiesced to by it; or

               (iv)  has entered against it the appointment of or taking
          possession by a receiver, liquidator, assignee, custodian, trustee,
          sequestrator or similar official of any part of the Collateral of a
          value in excess of the Dollar Equivalent of $2,500,000 in a proceeding
          brought against or initiated by it, and such appointment or taking
          possession is neither made ineffective nor discharged within sixty
          days after the making thereof, or such appointment or taking
          possession is at any time consented to, requested by, or acquiesced to
          by it; or

               (v)   has entered against it a final judgment for the payment of
          money in excess of the Dollar Equivalent of $2,500,000 (in each case
          not covered by insurance satisfactory to Administrative Agent in its
          discretion), unless the same is stayed or discharged within thirty
          days after the date of entry thereof or an appeal or appropriate
          proceeding for review thereof is taken within such period and a stay
          of execution pending such appeal is obtained; or

               (vi)  suffers a writ or warrant of attachment or any similar
          process to be issued by any Tribunal against all or any substantial
          part of its assets or any part of the Collateral of a value in excess
          of the Dollar Equivalent of $2,500,000, and such writ or warrant of
          attachment or any similar process is not stayed or released within
          thirty days after the entry or levy thereof or after any stay is
          vacated or set aside;

          (j)  General Partner shall default in the payment when due of any
     principal of or interest on any of its Indebtedness in excess of $1,000,000
     in the aggregate, or any

                                      99
<PAGE>

     event specified in any note, agreement, indenture or other document
     evidencing or relating to any such Indebtedness shall occur if the effect
     of such event is to cause, or (with the giving of any notice or the lapse
     of time or both) to permit the holder or holders of such Indebtedness (or a
     trustee or agent on behalf of such holder or holders) to cause, such
     Indebtedness to become due, or to be prepaid in full (whether by
     redemption, purchase, offer to purchase or otherwise), prior to its stated
     maturity; or

          (k)  Any Change in Control occurs.

Upon the occurrence of an Event of Default described in subsection (i)(i),
(i)(ii) or (i)(iii) of this section with respect to US Borrower, Term Borrower,
Canadian Revolver Borrower, All American or Plains MLP, all of the Obligations
shall thereupon be immediately due and payable, without demand, presentment,
notice of demand or of dishonor and nonpayment, protest, notice of protest,
notice of intention to accelerate, declaration or notice of acceleration, or any
other notice or declaration of any kind, all of which are hereby expressly
waived by US Borrower, Term Borrower, Canadian Revolver Borrower and each
Restricted Person who at any time ratifies or approves this Agreement.  Upon any
such acceleration, any obligation of any Lender to make any further Loans and
any obligation of US LC Issuer or Canadian LC Issuer to issue Letters of Credit
hereunder shall be permanently terminated.  During the continuance of any other
Event of Default, Administrative Agent at any time and from time to time may
(and upon written instructions from Majority Lenders, Administrative Agent
shall), without notice to US Borrower, Term Borrower, Canadian Revolver Borrower
or any other Restricted Person, do either or both of the following:  (1)
terminate any obligation of Lenders to make Loans hereunder and any obligation
of US LC Issuer or Canadian LC Issuer to issue Letters of Credit hereunder, and
(2) declare any or all of the Obligations immediately due and payable, and all
such Obligations shall thereupon be immediately due and payable, without demand,
presentment, notice of demand or of dishonor and nonpayment, protest, notice of
protest, notice of intention to accelerate, declaration or notice of
acceleration, or any other notice or declaration of any kind, all of which are
hereby expressly waived by US Borrower, Term Borrower, Canadian Revolver
Borrower and each Restricted Person who at any time ratifies or approves this
Agreement.

     Section 8.2.  Remedies.  If any Default shall occur and be continuing,
                   --------
each Lender Party may protect and enforce its rights under the Loan Documents by
any appropriate proceedings, including proceedings for specific performance of
any covenant or agreement contained in any Loan Document, and each Lender Party
may enforce the payment of any Obligations due it or enforce any other legal or
equitable right which it may have.  All rights, remedies and powers conferred
upon Lender Parties under the Loan Documents shall be deemed cumulative and not
exclusive of any other rights, remedies or powers available under the Loan
Documents or at Law or in equity.

                              ARTICLE IX - Agents
                                           ------

     Section 9.1.  Appointment and Authority.
                   -------------------------

                                      100
<PAGE>

     (a)  Each Lender Party hereby irrevocably authorizes Administrative Agent,
and Administrative Agent hereby undertakes, to receive payments of principal,
interest and other amounts due hereunder as specified herein and to take all
other actions and to exercise such powers under the Loan Documents as are
specifically delegated to Administrative Agent by the terms hereof or thereof,
together with all other powers reasonably incidental thereto.  The relationship
of Administrative Agent to the other Lender Parties is only that of one
commercial lender acting as administrative agent for others, and nothing in the
Loan Documents shall be construed to constitute Administrative Agent a trustee
or other fiduciary for any Lender Party or any holder of any participation in a
Note nor to impose on Administrative Agent duties and obligations other than
those expressly provided for in the Loan Documents.  With respect to any matters
not expressly provided for in the Loan Documents and any matters which the Loan
Documents place within the discretion of Administrative Agent, Administrative
Agent shall not be required to exercise any discretion or take any action, and
it may request instructions from Lenders with respect to any such matter, in
which case it shall be required to act or to refrain from acting (and shall be
fully protected and free from liability to all Lender Parties in so acting or
refraining from acting) upon the instructions of Majority Lenders (including
itself), provided, however, that Administrative Agent shall not be required to
take any action which exposes it to a risk of personal liability that it
considers unreasonable or which is contrary to the Loan Documents or to
applicable Law.  Upon receipt by Administrative Agent from any Borrower of any
communication calling for action on the part of Lenders or upon notice from any
Borrower or any Lender to Administrative Agent of any Default or Event of
Default, Administrative Agent shall promptly notify each other Lender thereof.
Each Lender hereby expressly authorizes Administrative Agent, on behalf of such
Lender, to execute and deliver the Intercreditor Agreement in the form attached
hereto as Exhibit H.

     (b)  Each Lender Party hereby irrevocably authorizes Canadian
Administration Agent, and Canadian Administration Agent hereby undertakes, to
receive payments of principal, interest and other amounts due hereunder as
specified herein and to take all other actions and to exercise such powers under
the Loan Documents as are specifically delegated to Canadian Administration
Agent by the terms hereof or thereof, together with all other powers reasonably
incidental thereto. The relationship of Canadian Administration Agent to the
other Lender Parties is only that of one commercial lender acting as
administrative agent for others, and nothing in the Loan Documents shall be
construed to constitute Canadian Administration Agent a trustee or other
fiduciary for any Lender Party or any holder of any participation in a Canadian
Revolver Note nor to impose on Canadian Administration Agent duties and
obligations other than those expressly provided for in the Loan Documents. With
respect to any matters not expressly provided for in the Loan Documents and any
matters which the Loan Documents place within the discretion of Canadian
Administration Agent, Canadian Administration Agent shall not be required to
exercise any discretion or take any action, and it may request instructions from
Lenders with respect to any such matter, in which case it shall be required to
act or to refrain from acting (and shall be fully protected and free from
liability to all Lender Parties in so acting or refraining from acting) upon the
instructions of Majority Lenders (including itself), provided, however, that
Canadian Administration Agent shall not be required to take any action which
exposes it to a risk of personal liability that it considers unreasonable or
which is contrary to the Loan Documents or to applicable Law. Upon receipt by
Canadian Administration Agent from

                                      101
<PAGE>

any Borrower of any communication calling for action on the part of Lenders or
upon notice from any Borrower or any Lender to Canadian Administration Agent of
any Default or Event of Default, Canadian Administration Agent shall promptly
notify each other Lender thereof.

     Section 9.2.  Exculpation, Administrative Agent's Reliance, Etc.  Neither
                   -------------------------------------------------
any Agent nor any of its directors, officers, agents, attorneys, or employees
shall be liable for any action taken or omitted to be taken by any of them under
or in connection with the Loan Documents, including their negligence of any
kind, except that each shall be liable for its own gross negligence or willful
misconduct.  Without limiting the generality of the foregoing, each Agent (a)
may treat the payee of any Note as the holder thereof until such Agent receives
written notice of the assignment or transfer thereof in accordance with this
Agreement, signed by such payee and in form satisfactory to such Agent; (b) may
consult with legal counsel (including counsel for any Borrower), independent
public accountants and other experts selected by it and shall not be liable for
any action taken or omitted to be taken in good faith by it in accordance with
the advice of such counsel, accountants or experts; (c) makes no warranty or
representation to any other Lender Party and shall not be responsible to any
other Lender Party for any statements, warranties or representations made in or
in connection with the Loan Documents; (d) shall not have any duty to ascertain
or to inquire as to the performance or observance of any of the terms, covenants
or conditions of the Loan Documents on the part of any Restricted Person or to
inspect the property (including the books and records) of any Restricted Person;
(e) shall not be responsible to any other Lender Party for the due execution,
legality, validity, enforceability, genuineness, sufficiency or value of any
Loan Document or any instrument or document furnished in connection therewith;
(f) may rely upon the representations and warranties of each Restricted Person
or Lender Party in exercising its powers hereunder; and (g) shall incur no
liability under or in respect of the Loan Documents by acting upon any notice,
consent, certificate or other instrument or writing (including any facsimile,
telegram, cable or telex) believed by it to be genuine and signed or sent by the
proper Person or Persons.

     Section 9.3.  Credit Decisions.  Each Lender Party acknowledges that it
                   ----------------
has, independently and without reliance upon any other Lender Party, made its
own analysis of US Borrower, Term Borrower, and Canadian Revolver Borrower and
the transactions contemplated hereby and its own independent decision to enter
into this Agreement and the other Loan Documents.  Each Lender Party also
acknowledges that it will, independently and without reliance upon any other
Lender Party and based on such documents and information as it shall deem
appropriate at the time, continue to make its own credit decisions in taking or
not taking action under the Loan Documents.

     Section 9.4.  Indemnification.  Each Lender agrees to indemnify each Agent
                   ---------------
(to the extent not reimbursed by US Borrower, Term Borrower, or Canadian
Revolver Borrower within ten (10) days after demand) from and against such
Lender's Aggregate Percentage Share of any and all liabilities, obligations,
claims, losses, damages, penalties, fines, actions, judgments, suits,
settlements, costs, expenses or disbursements (including reasonable fees of
attorneys, accountants, experts and advisors) of any kind or nature whatsoever
(in this section collectively called "liabilities and costs") which to any
extent (in

                                      102
<PAGE>

whole or in part) may be imposed on, incurred by, or asserted against such Agent
growing out of, resulting from or in any other way associated with any of the
Collateral, the Loan Documents and the transactions and events (including the
enforcement thereof) at any time associated therewith or contemplated therein
(whether arising in contract or in tort or otherwise and including any violation
or noncompliance with any Environmental Laws by any Person or any liabilities or
whole or in part) may be imposed on, incurred by, or asserted against such Agent
growing out of, resulting from or in any other way associated with any of the
Collateral, the Loan Documents and the transactions and events (including the
enforcement thereof) at any time associated therewith or contemplated therein
(whether arising in contract or in tort or otherwise and including any violation
or noncompliance with any Environmental Laws by any Person or any liabilities or
duties of any Person with respect to Hazardous Materials found in or released
into the environment).

The foregoing indemnification shall apply whether or not such liabilities and
costs are in any way or to any extent owed, in whole or in part, under any claim
or theory of strict liability or caused, in whole or in part, by any negligent
act or omission of any kind by any Agent, provided only that no Lender shall be
obligated under this section to indemnify any Agent for that portion, if any, of
any liabilities and costs which is proximately caused by such Agent's own
individual gross negligence or willful misconduct, as determined in a final
judgment.  Cumulative of the foregoing, each Lender agrees to reimburse each
Agent promptly upon demand for such Lender's Aggregate Percentage Share of any
costs and expenses to be paid to such Agent by US Borrower, Term Borrower, and
Canadian Revolver Borrower under Section 10.4(a) to the extent that such Agent
is not timely reimbursed for such expenses by such Persons as provided in such
section.  As used in this section the term " Agent" shall refer not only to the
Persons designated as such in Section 1.1 but also to each director, officer,
agent, attorney, employee, representative and Affiliate of such Person.

     Section 9.5.  Rights as Lender.  In its capacity as a Lender, each Agent
                   ----------------
shall have the same rights and obligations as any Lender and may exercise such
rights as though it were not an Agent.  Each Agent may accept deposits from,
lend money to, act as trustee under indentures of, and generally engage in any
kind of business with any Restricted Person or their Affiliates, all as if it
were not Administrative Agent hereunder and without any duty to account therefor
to any other Lender.

     Section 9.6.  Sharing of Set-Offs and Other Payments.  Each Lender Party
                   --------------------------------------
agrees that if it shall, whether through the exercise of rights under Security
Documents or rights of banker's lien, set off, or counterclaim against US
Borrower, Term Borrower, or Canadian Revolver Borrower or otherwise, obtain
payment of a portion of the aggregate Obligations owed to it which, taking into
account all distributions made by either Agent under Section 3.1, causes such
Lender Party to have received more than it would have received had such payment
been received by either Agent and distributed pursuant to Section 3.1, then (a)
it shall be deemed to have simultaneously purchased and shall be obligated to
purchase interests in the Obligations as necessary to cause all Lender Parties
to share all payments as provided for in Section 3.1, and (b) such other
adjustments shall be made from time to time as shall be equitable to ensure that
such Agent and all Lender Parties share all payments of Obligations as provided
in Section 3.1; provided, however, that nothing herein contained shall in any
way affect the right of any Lender Party to obtain payment (whether by exercise
of rights of banker's lien, set-off or counterclaim or otherwise) of
indebtedness other than the Obligations.  Each of US Borrower, Term Borrower,

                                      103
<PAGE>

and Canadian Revolver Borrower expressly consents to the foregoing arrangements
and agrees that any holder of any such interest or other participation in the
Obligations, whether or not acquired pursuant to the foregoing arrangements, may
to the fullest extent permitted by Law and, subject to the provisions of Section
6.16, exercise any and all rights of banker's lien, set-off, or counterclaim as
fully as if such holder were a holder of the Obligations in the amount of such
interest or other participation.  If all or any part of any funds transferred
pursuant to this section is thereafter recovered from the seller under this
section which received the same, the purchase provided for in this section shall
be deemed to have been rescinded to the extent of such recovery, together with
interest, if any, if interest is required pursuant to the order of a Tribunal to
be paid on account of the possession of such funds prior to such recovery.

     Section 9.7.  Investments.  Whenever either Agent in good faith determines
                   -----------
that it is uncertain about how to distribute to Lender Parties any funds which
it has received, or whenever either Agent in good faith determines that there is
any dispute among Lender Parties about how such funds should be distributed,
such Agent may choose to defer distribution of the funds which are the subject
of such uncertainty or dispute.  If either Agent in good faith believes that the
uncertainty or dispute will not be promptly resolved, or if either Agent is
otherwise required to invest funds pending distribution to Lender Parties, such
Agent shall invest such funds pending distribution; all interest on any such
Investment shall be distributed upon the distribution of such Investment and in
the same proportion and to the same Persons as such Investment.  All moneys
received by either Agent for distribution to Lender Parties (other than to the
Person who is Administrative Agent in its separate capacity as a Lender Party or
the Person who is Canadian Administration Agent in its separate capacity as a
Lender Party) shall be held by such Agent pending such distribution solely as
such Agent for such Lender Parties, and such Agent shall have no equitable title
to any portion thereof.

     Section 9.8.  Benefit of Article IX.  The provisions of this Article are
                   ---------------------
intended solely for the benefit of Lender Parties, and no Restricted Person
shall be entitled to rely on any such provision or assert any such provision in
a claim or defense against any Lender (other than in relation to the reference
to Section 6.16 contained in Section 9.6 or the right to reasonably approve a
successor Agent under Section 9.9).  Lender Parties may waive or amend such
provisions as they desire without any notice to or consent of US Borrower, Term
Borrower, or Canadian Revolver Borrower or any other Restricted Person.

     Section 9.9.  Resignation.
                   -----------

     (a)  Administrative Agent may resign at any time by giving written notice
thereof to Lenders and US Borrower.  Each such notice shall set forth the date
of such resignation.  Upon any such resignation Majority Lenders shall have the
right to appoint a successor Administrative Agent, subject to the approval of US
Borrower, unless a Default has occurred and is continuing, which approval will
not be unreasonably withheld.  A successor must be appointed for any retiring
Administrative Agent, and such Administrative Agent's resignation shall become
effective when such successor accepts such appointment.  If, within thirty days
after the date of the retiring Administrative Agent's resignation, no successor
Administrative Agent has been appointed and has accepted such appointment, then
the retiring Administrative Agent may

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<PAGE>

appoint a successor Administrative Agent, which shall be a commercial bank
organized or licensed to conduct a banking or trust business under the Laws of
the United States of America or of any state thereof. Upon the acceptance of any
appointment as Administrative Agent hereunder by a successor Administrative
Agent, the retiring Administrative Agent shall be discharged from its duties and
obligations under this Agreement and the other Loan Documents. After any
retiring Administrative Agent's resignation hereunder the provisions of this
Article IX shall continue to inure to its benefit as to any actions taken or
omitted to be taken by it while it was Administrative Agent under the Loan
Documents.

     (b) Canadian Administration Agent may resign at any time by giving written
notice thereof to Lenders and Canadian Revolver Borrower.  Each such notice
shall set forth the date of such resignation.  Upon any such resignation
Majority Lenders shall have the right to appoint a successor Canadian
Administration Agent, subject to the approval of Canadian Revolver Borrower,
unless a Default has occurred and is continuing, which approval will not be
unreasonably withheld.  A successor must be appointed for any retiring Canadian
Administration Agent, and such Canadian Administration Agent's resignation shall
become effective when such successor accepts such appointment.  If, within sixty
days after the date of the retiring Canadian Administration Agent's resignation,
no successor Canadian Administration Agent has been appointed and has accepted
such appointment, then the retiring Canadian Administration Agent may appoint a
successor Canadian Administration Agent.  Each Canadian Administration Agent
shall be a commercial bank organized or licensed to conduct a banking or trust
business under the Laws of the Dominion of Canada or of any province thereof.
Upon the acceptance of any appointment as Canadian Administration Agent
hereunder by a successor Canadian Administration Agent, the retiring Canadian
Administration Agent shall be discharged from its duties and obligations under
this Agreement and the other Loan Documents.  After any retiring Canadian
Administration Agent's resignation hereunder the provisions of this Article IX
shall continue to inure to its benefit as to any actions taken or omitted to be
taken by it while it was Canadian Administration Agent under the Loan Documents.

     Section 9.10.  Other Agents.  Neither the Syndication Agent nor the
                    ------------
Documentation Agent ("Co-Agents"), in such capacities, shall have any duties or
                      ---------
responsibilities or incur any liabilities in such agency capacities (as opposed
to its capacity as a Lender) under or in connection with this Agreement or under
any of the other Loan Documents.  The relationship between US Borrower, Term
Borrower, Canadian Revolver Borrower on the one hand, and the Co-Agents and the
Agents, on the other hand, shall be solely that of borrower and lender.  None of
the Co-Agents shall have any fiduciary responsibilities to any of US Borrower,
Term Borrower, Canadian Revolver Borrower or any of its Affiliates.   None of
the Co-Agents undertakes any responsibility to any of US Borrower, Term
Borrower, and Canadian Revolver Borrower or any of its respective Affiliates to
review or inform any such Person of any matter in connection with any phase of
such Person's or such Affiliate's business or operations.

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<PAGE>

                           ARTICLE X - Miscellaneous
                                       -------------

     Section 10.1.  Waivers and Amendments; Acknowledgments.
                    ---------------------------------------

             (a) Waivers and Amendments.  No failure or delay (whether by
                 ----------------------
     course of conduct or otherwise) by any Lender in exercising any right,
     power or remedy which such Lender Party may have under any of the Loan
     Documents shall operate as a waiver thereof or of any other right, power or
     remedy, nor shall any single or partial exercise by any Lender Party of any
     such right, power or remedy preclude any other or further exercise thereof
     or of any other right, power or remedy. No waiver of any provision of any
     Loan Document and no consent to any departure therefrom shall ever be
     effective unless it is in writing and signed as provided below in this
     section, and then such waiver or consent shall be effective only in the
     specific instances and for the purposes for which given and to the extent
     specified in such writing. No notice to or demand on any Restricted Person
     shall in any case of itself entitle any Restricted Person to any other or
     further notice or demand in similar or other circumstances. This Agreement
     and the other Loan Documents set forth the entire understanding between the
     parties hereto with respect to the transactions contemplated herein and
     therein and supersede all prior discussions and understandings with respect
     to the subject matter hereof and thereof, and no waiver, consent, release,
     modification or amendment of or supplement to this Agreement or the other
     Loan Documents shall be valid or effective against any party hereto unless
     the same is in writing and signed by (i) if such party is a Borrower, by
     such Borrower, (ii if such party is Administrative Agent, Canadian
     Administration Agent, US LC Issuer or Canadian LC Issuer, by such party,
     and (ii if such party is a Lender, by such Lender or by Administrative
     Agent on behalf of Lenders with the written consent of Majority Lenders
     (which consent has already been given as to the termination of the Loan
     Documents as provided in Section 10.11). Notwithstanding the foregoing or
     anything to the contrary herein, Administrative Agent shall not, without
     the prior consent of each individual Lender, execute and deliver on behalf
     of such Lender any waiver or amendment which would: (1) waive any of the
     conditions specified in Article IV (provided that Administrative Agent may
     in its discretion withdraw any request it has made under Section 4.2(f)),
     (2) increase the maximum amount which such Lender is committed hereunder to
     lend, (3) reduce any fees payable to such Lender hereunder, or the
     principal of, or interest on, such Lender's Note, (4) change any date fixed
     for any payment of any such fees, principal or interest, (5) amend the
     definition herein of "Majority Lenders" or otherwise change the Aggregate
     Percentage Shares which are required for Administrative Agent, Canadian
     Administration Agent, Lenders or any of them to take any particular action
     under the Loan Documents, (6) release any Borrower from its obligation to
     pay such Lender's Note or any Guarantor from its guaranty of such payment,
     or (7) release any Collateral, except such releases relating to sales of
     property as permitted under Section 7.5.

             (b) Acknowledgments and Admissions.  Each Borrower hereby
                 ------------------------------
     represents, warrants, acknowledges and admits that (i) it has been advised
     by counsel in the negotiation, execution and delivery of the Loan Documents
     to which it is a party, (ii) it

                                      106
<PAGE>

     has made an independent decision to enter into this Agreement and the other
     Loan Documents to which it is a party, without reliance on any
     representation, warranty, covenant or undertaking by Administrative Agent
     or any other Lender Party, whether written, oral or implicit, other than as
     expressly set out in this Agreement or in another Loan Document delivered
     on or after the date hereof, (ii there are no representations, warranties,
     covenants, undertakings or agreements by any Lender Party as to the Loan
     Documents except as expressly set out in this Agreement or in another Loan
     Document delivered on or after the date hereof, (iv no Lender Party has any
     fiduciary obligation toward such Borrower with respect to any Loan Document
     or the transactions contemplated thereby, (v) the relationship pursuant to
     the Loan Documents between such Borrower and the other Restricted Persons,
     on one hand, and each Lender Party, on the other hand, is and shall be
     solely that of debtor and creditor, respectively, (vi no partnership or
     joint venture exists with respect to the Loan Documents between any
     Restricted Person and any Lender Party, (vi Administrative Agent is not
     such Borrower's Administrative Agent, but Administrative Agent for Lenders,
     (vi should an Event of Default or Default occur or exist, each Lender Party
     will determine in its sole discretion and for its own reasons what remedies
     and actions it will or will not exercise or take at that time, (ix without
     limiting any of the foregoing, such Borrower is not relying upon any
     representation or covenant by any Lender Party, or any representative
     thereof, and no such representation or covenant has been made, that any
     Lender Party will, at the time of an Event of Default or Default, or at any
     other time, waive, negotiate, discuss, or take or refrain from taking any
     action permitted under the Loan Documents with respect to any such Event of
     Default or Default or any other provision of the Loan Documents, and (x)
     all Lender Parties have relied upon the truthfulness of the acknowledgments
     in this section in deciding to execute and deliver this Agreement and to
     become obligated hereunder.

          (c) Representation by Lenders.  Each Lender hereby represents that it
              -------------------------
     will acquire its Notes for its own account in the ordinary course of its
     commercial lending or investing business; however, the disposition of such
     Lender's property shall at all times be and remain within its control and,
     in particular and without limitation, such Lender may sell or otherwise
     transfer its Note, any participation interest or other interest in its
     Note, or any of its other rights and obligations under the Loan Documents
     subject to compliance with Sections 10.5(b) through (f), inclusive, and
     applicable Law.

          (d) Joint Acknowledgment.  This written 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.

          (e) Annual Rates of Interest.  For the purposes of the Interest Act
              ------------------------
     (Canada), whenever interest payable pursuant to this Agreement is
     calculated on the basis of a period other than a calendar year (in this
     Section 10.1(e), the "Interest Period"), each rate

                                      107
<PAGE>

      of interest determined pursuant to such calculation expressed as an annual
      rate is equivalent to such rate as so determined multiplied by the actual
      number of days in the calendar year in which the same is to be ascertained
      and divided by the number of days in the Interest Period.

      Section 10.2.  Survival of Agreements; Cumulative Nature.  All of
                     -----------------------------------------
Restricted Persons' various representations, warranties, covenants and
agreements in the Loan Documents shall survive the execution and delivery of
this Agreement and the other Loan Documents and the performance hereof and
thereof, including the making or granting  of the Loans and the  delivery of the
Notes and the other Loan Documents, and shall further survive until all of the
Obligations are paid in full to each Lender Party and all of Lender Parties'
obligations to Borrowers are terminated.  All statements and agreements
contained in any certificate or other instrument delivered by any Restricted
Person to any Lender Party under any Loan Document shall be deemed
representations and warranties by Borrowers or agreements and covenants of
Borrowers under this Agreement.  The representations, warranties, indemnities,
and covenants made by Restricted Persons in the Loan Documents, and the rights,
powers, and privileges granted to Lender Parties in the Loan Documents, are
cumulative, and, except for expressly specified waivers and consents, no Loan
Document shall be construed in the context of another to diminish, nullify, or
otherwise reduce the benefit to any Lender Party of any such representation,
warranty, indemnity, covenant, right, power or privilege.  In particular and
without limitation, no exception set out in this Agreement to any
representation, warranty, indemnity, or covenant herein contained shall apply to
any similar representation, warranty, indemnity, or covenant contained in any
other Loan Document, and each such similar representation, warranty, indemnity,
or covenant shall be subject only to those exceptions which are expressly made
applicable to it by the terms of the various Loan Documents.

      Section 10.3.  Notices.  All notices, requests, consents, demands and
                     -------
other communications required or permitted under any Loan Document shall be in
writing, unless otherwise specifically provided in such Loan Document (provided
that Administrative Agent may give telephonic notices to the other Lender
Parties), and shall be deemed sufficiently given or furnished if delivered by
personal delivery, by facsimile or other electronic transmission, by delivery
service with proof of delivery, or by registered or certified United States
mail, postage prepaid, to Borrowers and Restricted Persons at the address of
Borrowers specified on the signature pages hereto and to each Lender Party at
its address specified on the signature pages hereto (unless changed by similar
notice in writing given by the particular Person whose address is to be
changed).  Any such notice or communication shall be deemed to have been given
(a) in the case of personal delivery or delivery service, as of the date of
first attempted delivery during normal business hours at the address provided
herein, (b) in the case of facsimile or other electronic transmission, upon
receipt, or (c) in the case of registered or certified United States mail, three
days after deposit in the mail; provided, however, that no Borrowing Notice or
Continuation/Conversion Notice shall become effective until actually received by
Administrative Agent.

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<PAGE>

     Section 10.4.   Payment of Expenses; Indemnity.
                     ------------------------------

              (a)    Payment of Expenses.  Whether or not the transactions
                     -------------------
     contemplated by this Agreement are consummated, each Borrower will promptly
     (and in any event, within 30 days after any invoice or other statement or
     notice) pay: (i) all transfer, stamp, mortgage, documentary or other
     similar taxes, assessments or charges levied by any governmental or revenue
     authority in respect of this Agreement or any of the other Loan Documents
     or any other document referred to herein or therein, (ii all reasonable
     costs and expenses incurred by or on behalf of Administrative Agent
     (including attorneys' fees, consultants' fees and engineering fees, travel
     costs and miscellaneous expenses) in connection with (1) the negotiation,
     preparation, execution and delivery of the Loan Documents, and any and all
     consents, waivers or other documents or instruments relating thereto, (2)
     the filing, recording, refiling and re-recording of any Loan Documents and
     any other documents or instruments or further assurances required to be
     filed or recorded or refiled or re-recorded by the terms of any Loan
     Document, (3) the borrowings hereunder and other action reasonably required
     in the course of administration hereof, (4) monitoring or confirming (or
     preparation or negotiation of any document related to) such Borrower's
     compliance with any covenants or conditions contained in this Agreement or
     in any Loan Document, and (ii all reasonable costs and expenses incurred by
     or on behalf of any Lender Party (including attorneys' fees, consultants'
     fees and accounting fees) in connection with the defense or enforcement of
     any of the Loan Documents (including this section) or the defense of any
     Lender Party's exercise of its rights thereunder. In addition to the
     foregoing, until all Obligations have been paid in full, each Borrower will
     also pay or reimburse Administrative Agent for all reasonable out-of-pocket
     costs and expenses of Administrative Agent or its agents or employees in
     connection with the continuing administration of the Loans and the related
     due diligence of Administrative Agent, including travel and miscellaneous
     expenses and fees and expenses of Administrative Agent's outside counsel,
     reserve engineers and consultants engaged in connection with the Loan
     Documents.

              (b)    Indemnity.  Each Borrower agrees to indemnify each Lender
                     ---------
     Party, upon demand, from and against any and all liabilities, obligations,
     claims, losses, damages, penalties, fines, actions, judgments, suits,
     settlements, costs, expenses or disbursements (including reasonable fees of
     attorneys, accountants, experts and advisors) of any kind or nature
     whatsoever (in this section collectively called "liabilities and costs")
     which to any extent (in whole or in part) may be imposed on, incurred by,
     or asserted against such Lender Party growing out of, resulting from or in
     any other way associated with any of the Collateral, the Loan Documents and
     the transactions and events (including the enforcement or defense thereof)
     at any time associated therewith or contemplated therein (whether arising
     in contract or in tort or otherwise and including any violation or
     noncompliance with any Environmental Laws by any Lender Party or any other
     Person or any liabilities or duties of any Lender Party or any other Person
     with respect to Hazardous Materials found in or released into the
     environment).

                                      109
<PAGE>

The foregoing indemnification shall apply whether or not such liabilities and
costs are in any way or to any extent owed, in whole or in part, under any claim
or theory of strict liability or caused, in whole or in part, by any negligent
act or omission of any kind by any Lender Party, provided only that no Lender
Party shall be entitled under this section to receive indemnification for that
portion, if any, of any liabilities and costs which is proximately caused by its
own individual gross negligence or willful misconduct, as determined in a final
judgment.  If any Person (including any Borrower or any of its Affiliates) ever
alleges such gross negligence or willful misconduct by any Lender Party, the
indemnification provided for in this section shall nonetheless be paid upon
demand, subject to later adjustment or reimbursement, until such time as a court
of competent jurisdiction enters a final judgment as to the extent and effect of
the alleged gross negligence or willful misconduct.  As used in this section the
term "Lender Party" shall refer not only to each Person designated as such in
Section 1.1 but also to each director, officer, trustee, agent, attorney,
employee, representative and Affiliate of such Persons.

     Section 10.5.  Joint and Several Liability; Parties in Interest;
                    -------------------------------------------------
Assignments; Replacement Notes.
------------------------------

     (a) All Obligations which are incurred by two or more Restricted Persons
shall be their joint and several obligations and liabilities.  All grants,
covenants and agreements contained in the Loan Documents shall bind and inure to
the benefit of the parties thereto and their respective successors and permitted
assigns; provided, however, that no Restricted Person may assign or transfer any
of its rights or delegate any of its duties or obligations under any Loan
Document without the prior consent of all Lenders.  Neither any Borrower nor any
Affiliates of any Borrower shall directly or indirectly purchase or otherwise
retire any Obligations owed to any Lender nor will any Lender accept any offer
to do so, unless each Lender shall have received substantially the same offer
with respect to the same Percentage Share of the Obligations owed to it.  If any
Borrower or any Affiliate of any Borrower at any time purchases some but less
than all of the Obligations owed to all Lender Parties, such purchaser shall not
be entitled to any rights of any Lender under the Loan Documents unless and
until such Borrower or its Affiliates have purchased all of the Obligations.

     (b) No Lender shall sell any participation interest in its commitment
hereunder or any of its rights under its Loans or under the Loan Documents to
any Person unless the agreement between such Lender and such participant at all
times provides: (i) that such participation exists only as a result of the
agreement between such participant and such Lender and that such transfer does
not give such participant any right to vote as a Lender or any other direct
claims or rights against any Person other than such Lender, (ii) that such
participant is not entitled to payment from any Restricted Person under Sections
3.2 through 3.6 of amounts in excess of those payable to such Lender under such
sections (determined without regard to the sale of such participation), and
(iii) unless such participant is an Affiliate of such Lender, that such
participant shall not be entitled to require such Lender to take any action
under any Loan Document or to obtain the consent of such participant prior to
taking any action under any Loan Document, except for actions which would
require the consent of all Lenders under subsection (a) of Section 10.1.  No
Lender selling such a participation shall, as between the other parties hereto
and such Lender, be

                                      110
<PAGE>

relieved of any of its obligations hereunder as a result of the sale of such
participation. Each Lender which sells any such participation to any Person
(other than an Affiliate of such Lender) shall give prompt notice thereof to
Administrative Agent and the relevant Borrower; provided, however, that no
liability shall arise if any such Lender fails to give such notice to such
Borrower.

     (c) Except for sales of participations under the immediately preceding
subsection, no Lender shall make any assignment or transfer of any kind of its
commitments or any of its rights under its Loans or under the Loan Documents,
except for assignments to an Eligible Transferee or, subject to the provisions
of Subsection (g) below, to an Affiliate, and then only if such assignment is
made in accordance with the following requirements:

          (i)    In the case of an assignment by a US Lender or Canadian
     Revolver Lender of less than all of its Loans, LC Obligations, and
     Commitments, each such assignment shall apply to a consistent percentage of
     all Loans and LC Obligations owing to the assignor Lender hereunder and to
     the same percentage of the unused portion of the assignor Lender's
     Commitments, so that after such assignment is made both the assignee Lender
     and the assignor Lender shall have a fixed (and not a varying) Percentage
     Share in its Loans and LC Obligations and be committed to make that
     Percentage Share of all future Loans and make that Percentage Share of all
     future participations in LC Obligations, and the Percentage Share of such
     US Commitment or Canadian Revolver Commitment of each of the assignor and
     assignee shall equal or exceed $5,000,000. In the case of an assignment by
     a Term Lender of less than all of its Term Loan, after such assignment is
     made, the Term Loan Percentage Share of each of the assignee Term Lender
     and the assignor Term Lender shall equal or exceed 1% (provided that such
     minimum Term Loan Percentage Share shall not be required in connection with
     any assignment by any Lender to any fund that invests in loans and is
     managed by such Lender, any affiliate of such Lender or the same fund
     manager).

          (ii)   The parties to each such assignment shall execute and deliver
     to Administrative Agent (and, as to assignments of Canadian Obligations,
     Canadian Administration Agent), for its acceptance and recording in the
     "Register" (as defined below in this section), an Assignment and Acceptance
     in the form of Exhibit H, appropriately completed, together with the Note
     subject to such assignment and a processing fee payable by such assignor
     Lender (and not at Borrower's expense) to Administrative Agent of $3,500;
     provided, no such processing fee shall be payable in connection with any
     assignment of any Term Loan (or portion thereof) by a Lender to any fund
     that invests in loans and is managed by such Lender or any affiliate of
     such Lender. Upon such execution, delivery, and payment and upon the
     satisfaction of the conditions set out in such Assignment and Acceptance,
     then (i) the relevant Borrower shall issue new Notes to such assignor and
     assignee upon return of the old Notes to the relevant Borrower, and (ii) as
     of the "Settlement Date" specified in such Assignment and Acceptance the
     assignee thereunder shall be a party hereto and a Lender hereunder and
     Administrative Agent shall thereupon deliver to the relevant Borrower and
     each Lender a revised Schedule 1 hereto showing the revised Percentage
     Shares and total Percentage

                                      111
<PAGE>

     Shares of such assignor Lender and such assignee Lender and the revised
     Percentage Shares and total Percentage Shares of all other Lenders.

          (iii)  Each assignee Lender other than an assignee Canadian Revolver
     Lender which is not a United States person (as such term is defined in
     Section 7701(a)(30) of the Code) for Federal income tax purposes, shall (to
     the extent it has not already done so) provide Administrative Agent and
     Borrower with the "Prescribed Forms" referred to in Section 3.7(d).

          (iv)   Each assignee Canadian Revolver Lender shall be a financial
     institution that is not a non-resident of Canada for the purposes of the
     Income Tax Act (Canada).

     (d) Any Lender may at any time pledge all or any portion of its Loan and
Note (and related rights under the Loan Documents including any portion of its
Note) to any of the twelve (12) Federal Reserve Banks organized under Section 4
of the Federal Reserve Act, 12 U.S.C. Section 341.  No such pledge or
enforcement thereof shall release any such Lender from its obligations under any
of the Loan Documents; provided that all related costs, fees and expenses in
connection with any such pledge shall be for the sole account of such Lender.

     (e) By executing and delivering an Assignment and Acceptance, each assignee
Lender thereunder will be confirming to and agreeing with the relevant Borrower,
Administrative Agent and each other Lender Party that such assignee understands
and agrees to the terms hereof, including Article IX hereof.

     (f) Administrative Agent (and with respect to Canadian Obligations,
Canadian Administration Agent) shall maintain a copy of each Assignment and
Acceptance and a register for the recordation of the names and addresses of
Lenders and the Percentage Shares of, and principal amount of the Loans owing
to, each Lender from time to time (in this section called the "Register").  The
entries in the Register shall be conclusive, in the absence of manifest error,
and Borrowers and each Lender Party may treat each Person whose name is recorded
in the Register as a Lender Party hereunder for all purposes.  The Register
shall be available for inspection by Borrowers or any Lender Party at any
reasonable time and from time to time upon reasonable prior notice.

     (g) Any Lender may assign or transfer its commitment or its rights under
its Loans or under the Loan Documents to (i) any Affiliate that is wholly-owned
direct or indirect subsidiary of such Lender or of any Person that wholly owns,
directly or indirectly, such Lender, or (ii) if such Lender is a fund that makes
or invests in bank loans, any other fund that makes or invests in bank loans and
is advised or managed by (A) the same investment advisor as any Lender or (B)
any Affiliate of such investment advisor that is a wholly-owned direct or
indirect subsidiary of any Person that wholly owns, directly or indirectly, such
investment advisor, subject to the following additional conditions:

          (x)    any right of such Lender assignor and such assignee to vote as
     a Lender, or any other direct claims or rights against any other Persons,
     shall be uniformly exercised

                                      112
<PAGE>

     or pursued in the manner that such Lender assignor would have so exercised
     such vote, claim or right if it had not made such assignment or transfer;

          (y)    such assignee shall not be entitled to payment from any
     Restricted Person under Sections 3.2 through 3.7 of amounts in excess of
     those payable to such Lender assignor under such sections (determined
     without regard to such assignment or transfer); and

          (z)    if such Lender assignor is a Lender that assigns or transfers
     to such assignee any of such Lender Commitment, assignee may become
     primarily liable for such Commitment, but such assignment or transfer shall
     not relieve or release such Lender from such Commitment.

     (h)    Upon receipt of an affidavit reasonably satisfactory to Borrower of
an officer of any Lender as to the loss, theft, destruction or mutilation of its
Note or any Security Document which is not of public record, and, in the case of
any such loss, theft, destruction or mutilation, upon cancellation of such Note
or such Security Document, Borrower will execute and deliver, in lieu thereof, a
replacement Note in the same principal amount thereof and otherwise of like
tenor (or each Restricted Person a party to any such Security Document will
execute and deliver a replacement Security Document of like tenor).

     Section 10.6.  Confidentiality.  Each Lender Party agrees (on behalf of
                    ---------------
itself and each of its Affiliates, and each of its and their directors,
officers, agents, attorneys, employees, and representatives) that it (and each
of them) will take all reasonable steps to keep confidential any non-public
information supplied to it by or at the direction of any Restricted Person so
identified when delivered, provided, however, that this restriction shall not
apply to (a) information which has at the time in question entered the public
domain, (b) information which is required to be disclosed by Law (whether valid
or invalid) of any Tribunal, (c) any disclosure to any Lender Party's
Affiliates, auditors, attorneys, or agents, (d) any disclosure to any other
Lender Party or to any purchaser or prospective purchaser of participations or
other interests in any Loan or Loan Document (provided each such Person first
agrees to hold such information in confidence on the terms provided in this
section), or (e) any disclosure in the course of enforcing its rights and
remedies during the existence of an Event of Default.

      Section 10.7. Governing Law; Submission to Process.  Except to the extent
                    ------------------------------------
that the Law of another jurisdiction is expressly elected in a Loan Document,
the Loan Documents shall be deemed contracts and instruments made under the Laws
of the State of New York and shall be construed and enforced in accordance with
and governed by the Laws of the State of New York and the Laws of the United
States of America, without regard to principles of conflicts of law.  Each
Borrower hereby agrees that any legal action or proceeding against such Borrower
with respect to this Agreement, the Notes or any of the Loan Documents may be
brought in the courts of the State of New York or of the United States of
America for the Southern District of New York as Lender Parties may elect, and,
by execution and delivery hereof, each Borrower accepts

                                      113
<PAGE>

and consents for itself and in respect to its property, generally and
unconditionally, the non-exclusive jurisdiction of the aforesaid courts. Each
Borrower agrees that Sections 5-1401 and 5-1402 of the General Obligations Law
of the State of New York shall apply to the Loan Documents and waives any right
to stay or to dismiss any action or proceeding brought before said courts on the
basis of forum non conveniens. In furtherance of the foregoing, each Borrower
hereby irrevocably designates and appoints Corporation Service Company, 80 State
Street, Albany, New York 12207, as agent of such Borrower to receive service of
all process brought against such Borrower with respect to any such proceeding in
any such court in New York, such service being hereby acknowledged by such
Borrower to be effective and binding service in every respect. Copies of any
such process so served shall also, if permitted by Law, be sent by registered
mail to the relevant Borrower at its address set forth below, but the failure of
such Borrower to receive such copies shall not affect in any way the service of
such process as aforesaid. Each Borrower shall furnish to Lender Parties a
consent of Corporation Service Company agreeing to act hereunder prior to the
effective date of this agreement. Nothing herein shall affect the right of
Lender Parties to serve process in any other manner permitted by Law or shall
limit the right of Lender Parties to bring proceedings against any Borrower in
the courts of any other jurisdiction. If for any reason Corporation Service
Company shall resign or otherwise cease to act as any Borrower's agent, each
Borrower hereby irrevocably agrees to (a) immediately designate and appoint a
new agent acceptable to Administrative Agent to serve in such capacity and, in
such event, such new agent shall be deemed to be substituted for Corporation
Service Company for all purposes hereof and (b) promptly deliver to Agent the
written consent (in form and substance satisfactory to Administrative Agent) of
such new agent agreeing to serve in such capacity.

      Section 10.8.   Waiver of Judgment Interest Act (Alberta).  To the extent
                      -----------------------------------------
permitted by Law, the provisions of the Judgment Interest Act (Alberta) shall
not apply to the Canadian Revolver Notes, the Term Notes, and the other Loan
Documents and are hereby expressly waived by Canadian Revolver Borrower and Term
Borrower.

      Section 10.9.   Deemed Reinvestment Not Applicable.  For the purposes of
                      ----------------------------------
the Interest Act (Canada), the principle of deemed reinvestment of interest
shall not apply to any interest calculation under the Loan Documents, and the
rates of interest stipulated in this Agreement are intended to be nominal rates
and not effective rates or yields.

      Section 10.10.  Limitation on Interest.  Lender Parties, Restricted
                      ----------------------
Persons and any other parties to the Loan Documents intend to contract in strict
compliance with applicable usury Law from time to time in effect.  In
furtherance thereof such Persons stipulate and agree that none of the terms and
provisions contained in the Loan Documents shall ever be construed to create a
contract to pay, for the use, forbearance or detention of money, interest in
excess of the maximum amount of interest permitted to be contracted for,
charged, or received by applicable

                                      114
<PAGE>

Law from time to time in effect. Neither any Restricted Person nor any present
or future guarantors, endorsers, or other Persons hereafter becoming liable for
payment of any Obligation shall ever be liable for unearned interest thereon or
shall ever be required to pay interest thereon in excess of the maximum amount
that may be lawfully contracted for, charged, or received under applicable Law
from time to time in effect, and the provisions of this section shall control
over all other provisions of the Loan Documents which may be in conflict or
apparent conflict herewith. Lender Parties expressly disavow any intention to
contract for, charge, or receive excessive unearned interest or finance charges
in the event the maturity of any Obligation is accelerated. If (a) the maturity
of any Obligation is accelerated for any reason, (b) any Obligation is prepaid
and as a result any amounts held to constitute interest are determined to be in
excess of the legal maximum, or (c) any Lender or any other holder of any or all
of the Obligations shall otherwise collect moneys which are determined to
constitute interest which would otherwise increase the interest on any or all of
the Obligations to an amount in excess of that permitted to be contracted for,
charged or received by applicable Law then in effect, then all sums determined
to constitute interest in excess of such legal limit shall, without penalty, be
promptly applied to reduce the then outstanding principal of the related
Obligations or, at such Lender's or holder's option, promptly returned to
Borrower or other payor thereof upon such determination. In determining whether
or not the interest paid or payable, under any specific circumstance, exceeds
the maximum amount permitted under applicable Law, Lender Parties and Restricted
Persons (and any other payors thereof) shall to the greatest extent permitted
under applicable Law, (i) characterize any non-principal payment as an expense,
fee or premium rather than as interest, (ii exclude voluntary prepayments and
the effects thereof, and (ii amortize, prorate, allocate, and spread the total
amount of interest throughout the entire contemplated term of the instruments
evidencing the Obligations in accordance with the amounts outstanding from time
to time thereunder and the maximum legal rate of interest from time to time in
effect under applicable Law in order to lawfully charge the maximum amount of
interest permitted under applicable Law. In the event applicable Law provides
for an interest ceiling under Chapter 303 of the Texas Finance Code (the "Texas
Finance Code") as amended, to the extent that the Texas Finance Code is
mandatorily applicable to any Lender, for that day, the ceiling shall be the
"weekly ceiling" as defined in the Texas Finance Code, provided that if any
applicable Law permits greater interest, the Law permitting the greatest
interest shall apply. In no event shall Chapter 346 of the Texas Finance Code
apply to this Agreement or any other Loan Document, or any transactions or loan
arrangement provided or contemplated hereby or thereby. In no event shall the
aggregate "interest" (as defined in section 347 of the Criminal Code (Canada))
payable under the Loan Documents exceed the maximum effective annual rate of
interest on the "credit advanced" (as defined in that section) permitted under
that section and, if any payment, collection or demand pursuant to this
Agreement in respect of "interest" (as defined in that section) is determined to
be contrary to the provisions of that section, such payment, collection or
demand shall be deemed to have been made by mutual mistake of Canadian Revolver
Borrower, Term Borrower, Canadian Administration Agent, Canadian Revolver
Lenders, and Term Lenders and the amount of such excess payment or collection
shall be refunded to the relevant Borrower. For purposes of the Canadian
Revolver Notes and the Term Notes, the effective annual rate of interest shall
be determined in accordance with generally accepted actuarial practices and
principles over the term applicable thereto on the basis of annual compounding
of the lawfully permitted rate of interest and, in the event of dispute, a
certificate of a Fellow of the Canadian

                                      115
<PAGE>

Institute of Actuaries appointed by Canadian Administration Agent shall be prima
facie evidence, for the purposes of such determination.

      Section 10.11.  Termination; Limited Survival.  In its sole and absolute
                      -----------------------------
discretion Borrower may at any time that no Obligations are owing or outstanding
elect in a written notice delivered to Administrative Agent to terminate this
Agreement.  Upon receipt by Administrative Agent of such a notice, if no
Obligations are then owing or outstanding this Agreement and all other Loan
Documents shall thereupon be terminated and the parties thereto released from
all prospective obligations thereunder.  Notwithstanding the foregoing or
anything herein to the contrary, any waivers or admissions made by any
Restricted Person in any Loan Document, any Obligations under Sections 3.2
through 3.6, and any obligations which any Person may have to indemnify or
compensate any Lender Party shall survive any termination of this Agreement or
any other Loan Document.  At the request and expense of Borrower, Administrative
Agent shall prepare and execute all necessary instruments to reflect and effect
such termination of the Loan Documents.  Administrative Agent is hereby
authorized to execute all such instruments on behalf of all Lenders, without the
joinder of or further action by any Lender.

      Section 10.12.  Severability.  If any term or provision of any Loan
                      ------------
Document shall be determined to be illegal or unenforceable all other terms and
provisions of the Loan Documents shall nevertheless remain effective and shall
be enforced to the fullest extent permitted by applicable Law.

      Section 10.13.  Counterparts.  This Agreement may be separately executed
                      ------------
in any number of counterparts and by different parties hereto in separate
counterparts, each of which when so executed shall be deemed to constitute one
and the same Agreement.

      Section 10.14.  Waiver of Jury Trial, Punitive Damages, etc.  Restricted
                      -------------------------------------------
Persons and Lender Parties mutually hereby knowingly, voluntarily, and
intentionally waive the right to a trial by jury in respect of any claim based
hereon, arising out of, under or in connection with, this Agreement or any other
Loan Documents contemplated to be executed in connection herewith or any course
of conduct, course of dealings, statements (whether verbal or written) or
actions of any party.  This waiver constitutes a material inducement for Lenders
to enter into this Agreement and the other Loan Documents and make the Loans.
Each Borrower and each Lender Party hereby further (a) irrevocably waives, to
the maximum extent not prohibited by Law, any right it may have to claim or
recover in any such litigation any "Special Damages," as defined below, (b)
certifies that no party hereto nor any representative or agent or counsel for
any party hereto has represented, expressly or otherwise, or implied that such
party would not, in the event of litigation, seek to enforce the foregoing
waivers, and (c) acknowledges that it has been induced to enter into this
Agreement, the other Loan Documents and the transactions contemplated hereby and
thereby by, among other things, the mutual waivers and certifications contained
in this section.  As used in this section, "Special Damages" includes all
special, consequential, exemplary, or punitive damages

                                      116
<PAGE>

(regardless of how named), but does not include any payments or funds which any
party hereto has expressly promised to pay or deliver to any other party hereto.

      Section 10.15.  Amendment and Restatement.  Upon satisfaction with each of
                      --------------------------
the conditions set forth in Section 4.1 (except any condition the performance of
which has been waived as a condition to the initial Loan or initial issuance of
a Letter of Credit pursuant to this Agreement), this Agreement shall be deemed
to amend and restate in their entirety the Existing Agreement, at which time
(the "Effective Time") each Lender and each Restricted Person hereby agrees that
(i) the Aggregate Percentage Share of each Lender and the Percentage Share of
each Lender with respect to US Loans, Canadian Revolver Loans, and Term Loans
shall be as set forth in the definition to this Agreement, (ii) the loans
outstanding under the Existing Agreement and all accrued and unpaid interest
thereon (but not any letters of credit issued and outstanding under the Existing
Agreement and reimbursement obligations with respect thereto, which are to be
deemed to be outstanding under and governed by the Marketing Credit Agreement as
provided therein), and all accrued and unpaid fees and expenses under the
Existing Agreement (the "Outstanding Obligations") shall be deemed to be
outstanding under and governed by this Agreement, and (iii) any party named as a
"Lender" under the Existing Agreement that is not a signatory hereto as a Lender
under this Agreement (an "Exiting Lender") shall cease to be a Lender and shall
be released from its obligations under the Existing Agreement and this
Agreement.  At the Effective Time, the Borrower shall make such adjustments in
the Loans, including the borrowing of additional Loans and the repayment of
Loans under the Existing Agreement plus all applicable accrued interest, fees
and expenses (including any costs under Article III of the Existing Agreement)
as shall be necessary to repay in full all Exiting Lenders and to provide for
Loans by each Lender in the amount of its new Percentage Share of US Loans,
Canadian Revolver Loans, and Term Loans, as applicable, as of the Effective
Time.

      Section 10.16.   CanPet Acquisition.  Lender Parties hereby consent to the
                       ------------------
CanPet Acquisition, subject to the following:

          (a)  Administrative Agent shall have received and approved copies of
      all environmental evaluations, reports or reviews related to properties to
      be acquired pursuant to the CanPet Acquisition, and there shall be no
      existing or potential environmental liabilities disclosed thereunder or
      otherwise existing except as disclosed by Borrowers to Administrative
      Agent and Lender Parties prior to the date hereof.

          (b)  Administrative Agent and each Lender Party shall have received
      any updated or revised business and/or financial projections with respect
      to the assets and operations to be acquired pursuant to the CanPet
      Acquisition, and no such projection shall materially and adversely differ
      from those projections previously delivered to Administrative Agent and
      Lenders.

          (c)  The CanPet Acquisition shall exclude the acquisition of any
      existing or potential environmental or litigation liabilities incurred
      prior to the CanPet Acquisition Closing Date, except as disclosed by
      Borrowers to Administrative Agent and Lender Parties prior to the date
      hereof, and US Borrower and Canadian Revolver Borrower, as

                                      117
<PAGE>

     acquirers, shall have received an environmental indemnity providing for a
     deductible of not more than C$50,000 in the aggregate (not applicable with
     respect to environmental liabilities disclosed to Administrative Agent and
     Lender Parties prior to the date hereof) and a cap of not less than
     C$3,000,000 in the aggregate, to be effective for not less than two years
     with respect to on-site contamination and three years with respect to off-
     site contamination following the CanPet Acquisition Closing Date, and
     otherwise reasonably satisfactory to Administrative Agent with respect to
     such liabilities.

          (d)  Administrative Agent  shall have received and approved copies of
     all CanPet Acquisition Documents and all other related documents as
     Administrative Agent may request.

          (e)  The cash portion of the purchase price shall not exceed
     C$39,700,000, subject to purchase price adjustments with respect to
     purchased inventory, prepayment made or received, and income earned from
     the March 1, 2001 effective date of the CanPet Acquisition through the
     CanPet Acquisition Closing Date, as provided for in the purchase agreement
     included in the CanPet Acquisition Documents.

          (f)  Both immediately prior to and immediately following the
     consummation of the CanPet Acquisition, no Material Adverse Change shall
     have occurred since December 31, 2000, and no Default or Event of Default
     shall have occurred and be continuing.

          (g)  Canadian Subsidiaries shall have delivered Security Documents
     pursuant to Section 6.14 of this Agreement with respect to the properties
     acquired pursuant to the CanPet Acquisition.

                 [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK.]

                                      118
<PAGE>

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

U.S. BORROWER:                    PLAINS MARKETING, L.P.

                                  By:   PLAINS ALL AMERICAN INC.,
                                        its general partner

                                        By:  _________________________________
                                             Phil Kramer, Exec. Vice President

TERM BORROWER:                    PMC (NOVA SCOTIA) COMPANY

                                  By:   ______________________________________
                                        Phil Kramer, Exec. Vice President

CANADIAN REVOLVER
BORROWER:                         PLAINS MARKETING CANADA, L.P.

                                  By:   PMC (Nova Scotia) Company,
                                        its general partner

                                        By:  _________________________________
                                             Phil Kramer, Exec. Vice President

GUARANTORS:                       ALL AMERICAN PIPELINE, L.P.

                                  By:   PLAINS ALL AMERICAN INC.,
                                        its general partner

                                        By:  _________________________________
                                             Phil Kramer, Exec. Vice President

                                  PLAINS ALL AMERICAN PIPELINE, L.P.

                                  By:   PLAINS ALL AMERICAN INC.,
                                        its general partner

                                        By:  _________________________________
                                             Phil Kramer, Exec. Vice President

Address for U.S. Borrower, Term   500 Dallas Street, Suite 700
Borrower, Canadian Revolver       Houston, Texas 77002
Borrower and Guarantors:          Attention: Phil Kramer
                                  Telephone: (713) 654-1414
                                  Fax: (713) 654-1523

                                      119
<PAGE>

                                        FLEET NATIONAL BANK,
                                        Administrative Agent, LC Issuer and
                                        a Lender

                                        By:  _________________________________
                                             Terrence Ronan, Managing Director

                                        Address:

                                        100 Federal Street
                                        Boston, Massachusetts 02110
                                        Attention: Terrence Ronan
                                        Mail Code: MADE 10008A

                                        Telephone: (617) 434-5472
                                        Fax: (617) 434-3652

                                        FLEET SECURITIES, INC.,
                                        Lead Arranger and Book Manager

                                        By:  _________________________________
                                             Richard Makin, Managing Director

                                      120
<PAGE>

                                        FIRST UNION NATIONAL BANK,
                                        Syndication Agent and a Lender

                                        By:  ___________________________________
                                             Robert R. Wetteroff, Sr. Vice Pres.

                                        Address:

                                        1001 Fannin, Suite 2255
                                        Houston, Texas 77002
                                        Attention: David Humphreys

                                        Telephone: (713) 650-9843
                                        Fax: (713) 650-6354

                                      121
<PAGE>

                                        BANK OF AMERICA, N.A.,
                                        Documentation Agent and a Lender

                                        By: __________________________________
                                            Name:
                                            Title:

                                        Address:

                                        Energy Finance Group
                                        333 Clay Street, Suite 4550
                                        Houston, Texas 77002
                                        Attention: Irene Rummel

                                        Telephone: (713) 651-4921
                                        Fax: (713) 651-4801

                                      122
<PAGE>

                                        BANK ONE, NA (MAIN OFFICE CHICAGO),
                                        Senior Managing Agent and a Lender

                                        By:  __________________________________
                                             Name:
                                             Title:

                                        Address:
                                        910 Travis
                                        Houston, Texas 77002
                                        Attention: Charles Kingswell-Smith

                                        Telephone: (713) 751-7803
                                        Telecopy: (713) 751-3544

                                      123
<PAGE>

                                        FORTIS CAPITAL CORP.
                                        Senior Managing Agent and a Lender

                                        By:  ________________________________
                                             Name:
                                             Title:

                                        By:  ________________________________
                                             Name:
                                             Title:

                                        Address:

                                        100 Crescent Court, Suite 1777
                                        Dallas, Texas 75201
                                        Attention: Darrell W. Holley

                                        Telephone: (214) 754-0009
                                        Telecopy:  (214) 754-5951

                                      124
<PAGE>

                              U.S. BANK NATIONAL ASSOCIATION,
                              a Lender

                              By: ___________________________________
                                  Name:
                                  Title:

                              Address:

                              918 17th Street
                              Denver, Colorado 80202
                              Attention: Monte E. Deckerd

                              Telephone: (303) 585-4212
                              Telecopy:  (303) 585-4362

                                      125
<PAGE>

                              BANK OF SCOTLAND,
                              a Lender

                              By: ___________________________________
                                  Name:
                                  Title:

                              Address:

                              565 Fifth Avenue
                              New York, New York 10017
                              Attention: Annie Glynn

                              Telephone: (212) 450-0871
                              Telecopy: (212) 557-9460

                              With Copy to:

                              1021 Main Street, Suite 1370
                              Houston, Texas 77002
                              Attention: Richard C. Butler

                              Telephone: (713) 650-0609
                              Telecopy:  (713) 651-9714

                                      126
<PAGE>

                              WELLS FARGO BANK (TEXAS),
                              NATIONAL ASSOCIATION, a Lender

                              By: ___________________________________
                                  Name:
                                  Title:

                              Address:

                              1000 Louisiana, 3rd Floor
                              Houston, Texas 77002
                              Attention: John Lane

                              Telephone: (713) 319-1370
                              Telecopy:  (713) 739-1087

                                      127
<PAGE>

                              THE BANK OF NOVA SCOTIA,
                              a Lender

                              By: ___________________________________
                                  Name:
                                  Title:

                              Address:

                              600 Peachtree Street, N.E., Ste 2700
                              Atlanta, Georgia 30308
                              Attention: Claude Ashby

                              Telephone: 404-877-_____
                              Telecopy: 404-888-8998

                              With Copy to:

                              Houston Representative Office
                              1100 Louisiana, Ste 3000
                              Houston, Texas 77002
                              Attention: Bryan Bulawa

                              Telephone: 713-759-3427
                              Telecopy: 713-752-2425

                                      128
<PAGE>

                              CREDIT AGRICOLE INDOSUEZ,
                              a Lender

                              By: ___________________________________
                                  Name:
                                  Title:

                              By: ___________________________________
                                  Name:
                                  Title:

                              Address:

                              600 Travis Street, Suite 2340
                              Houston, Texas 77002
                              Attention: Doug Whiddon

                              Telephone: 713-223-7003
                              Telecopy: 713-223-7029

                                      129
<PAGE>

                              TORONTO DOMINION (TEXAS), INC.,
                              a Lender

                              By: ___________________________________
                                  Name:
                                  Title:

                              Address:

                              909 Fannin, Suite 1700
                              Houston, Texas 77010
                              Attention: Alice Ellis

                              Telephone: (713) 653-8234
                              Telecopy: (713) 951-9921

                                      130
<PAGE>

                              SOUTHWEST BANK OF TEXAS, N.A.,
                              a Lender

                              By: _____________________________________
                                  Name:
                                  Title:

                              Address:

                              5 Post Oak Park
                              4400 Post Oak Parkway
                              Houston, Texas 77027
                              Attention: Stephen Kennedy

                              Telephone: (713) 235-8870
                              Telecopy:  (713) 439-5925

                                      131
<PAGE>

                              UNION BANK OF CALIFORNIA, N.A.,
                              a Lender

                              By: ___________________________________
                                  Name:
                                  Title:

                              Address:

                              500 North Akard, Suite 4200
                              Dallas, Texas 75201
                              Attn: Dustin Gaspari

                              Telephone: (214) 922-4200
                              Telecopy: (214) 922-4209

                                      132
<PAGE>

                              COMERICA BANK-TEXAS,
                              a Lender

                              By: ___________________________________
                                  Name:
                                  Title:

                              Address:

                              910 Louisiana, Suite 410
                              Houston, Texas 77002
                              Attention: Dan Steele

                              Telephone: (713) 220-5640
                              Telecopy:  (713) 220-5650

                                      133
<PAGE>

                              BNP PARIBAS, a Lender

                              By: ___________________________________
                                  Name:
                                  Title:

                              By: ___________________________________
                                  Name:
                                  Title:

                              Address:

                              787 7th Avenue
                              New York, New York 10019
                              Attention: Edward Chin/Marcie Weiss

                              Telephone: (212) 841-2020 (EC); x2029 (MW)
                              Telecopy:  (212) 841-2536

                                      134
<PAGE>

                              HELLER FINANCIAL, INC., a Lender

                              By:________________________________________
                                    Name:
                                    Title:

                              Address:

                              500 West Monroe Street
                              Chicago, Illinois 60661
                              Attention: Andrew Pluta

                              Telephone: (312) 441-6866
                              Telecopy: (312) 441-736

                                      135
<PAGE>

                              THE TORONTO-DOMINION BANK,
                              Canadian Administration Agent

                              By:____________________________________________
                                   Name:
                                   Title:

                              Address:

                              66 Wellington Street West
                              38/th/ Floor, TD Tower
                              Toronto, Ontario
                              M5K 1A2
                              Attention:   Vice President, Loan Syndications -
                                           Agency

                              Telephone: (416) 982-2196
                              Telecopy: (416) 982-5535

                              With a copy to:

                              909 Fannin, Suite 1700
                              Houston, Texas 77010
                              Attention: Alice Ellis

                              Telephone: (713) 653-8234
                              Telecopy: (713) 951-9921

                                      136
<PAGE>

                              THE TORONTO-DOMINION BANK,
                              a Lender

                              By:______________________________________
                                    Name:
                                    Title:

                              Address:

                              800 Home Oil Tower
                              324 - 8/th/ Avenue S.W.
                              Calgary, Alberta
                              T2P 2Z2
                              Attention: Loretta Palandri

                              Telephone: (403) 292-1287
                              Telecopy: (403) 292-2772

                              With a copy to:

                              909 Fannin, Suite 1700
                              Houston, Texas 77010
                              Attention: Alice Ellis

                              Telephone: (713) 653-8234
                              Telecopy: (713) 951-9921

                                      137
<PAGE>

                              BANK OF AMERICA CANADA, a Lender

                              By:__________________________________________
                                    Name:
                                    Title:

                              Address:

                               200 Front Street West,, Suite 2700
                               Toronto, Ontario. M5V 3L2.
                              Attention: Medina Sales de Andrade

                              Telephone: (416) 349-5433
                              Telecopy: (416) 349-4283

                                      138
<PAGE>

                              BNP PARIBAS (CANADA), a Lender

                              By:__________________________________________
                                    Name:
                                    Title:

                              By:__________________________________________
                                    Name:
                                    Title:

                              Address:

                              77 King Street West, Suite 4100
                              Royal Trust Tower
                              T.D. Centre
                              Toronto, Ontario. M5K 1N8.
                              Attention: Paul McCuaig
                              Telephone: (416) 365-6713
                              Telecopy: (416) 947-3538

                              With a copy to:

                              787 7th Avenue
                              New York, New York 10019
                              Attention: Edward Chin/Marcie Weiss

                              Telephone: (212) 841-2020 (EC); x2029 (MW)
                              Telecopy:  (212) 841-2536

                                      139
<PAGE>

                              HELLER FINANCIAL CANADA, LTD., a Lender

                              By:______________________________________
                                    Name:
                                    Title:

                              Address:

                              11 King West, Suite 1500
                              Toronto, Canada M5H4C7
                              Attention: Adam Flomen

                              Telephone: (416) 202-6211
                              Telecopy: (416)  202-6226

                              With a copy to:

                              500 West Monroe Street
                              Chicago, Illinois 60661
                              Attention: Andrew Pluta

                              Telephone: (312) 441-6866
                              Telecopy: (312) 441-7367

                                      140
<PAGE>

                              PILGRIM PRIME RATE TRUST, a Lender

                              By:   ING Pilgrim Investments, LLC
                                    as its investment manager

                              By:________________________________________
                                    Name:
                                    Title:

                              Address:

                              c/o ING Pilgrim Investments LLC
                              7337 E. Doubletree Ranch Road
                              Scottsdale, Arizona 85258-2034
                              Attention: Curtis Lee

                              Telephone: (480) 477-2221
                              Telecopy: (480) 477-2076

                                      141
<PAGE>

                              PILGRIM SENIOR INCOME FUND, a Lender

                              By:   ING Pilgrim Investments, LLC
                                    as its investment manager

                              By:___________________________________
                                    Name:
                                    Title:

                              Address:

                              c/o ING Pilgrim Investments LLC
                              7337 E. Doubletree Ranch Road
                              Scottsdale, Arizona 85258-2034
                              Attention: Chuck LeMieux

                              Telephone: (480) 477-2202
                              Telecopy: (480) 477-2076

                                      142
<PAGE>

                              MORGAN STANLEY DEAN WITTER PRIME
                               INCOME TRUST, a Lender

                              By:___________________________________
                                    Name:
                                    Title:

                              Address:

                              c/o Morgan Stanley Dean Witter Advisors Inc.
                              Two World Trade Center, 72/nd/ Floor
                              New York, New York 10048
                              Attention: Sheila Finnerty/Jinny Kim

                              Telephone: (212) 392--3415 (SF), -2883 (JK)
                              Telecopy: (212) 392-5345

                                      143
<PAGE>

                              EMERALD ORCHARD LIMITED, a Lender

                              By:_____________________________________
                                    Name:
                                    Title:

                              Address:

                              c/o Highland Capital Management, L.P.
                              1300 Two Galleria Tower
                              13455 Noel Road LB #45
                              Dallas, Texas 75240
                              Attention: Mark Okada

                              Telephone: (972) 233-4300
                              Telecopy: (972) 628-4343

                              With a copy to:

                              909 Fannin, Suite 1700
                              Houston, Texas 77010
                              Attention: Alice Ellis
                              Telephone: (713) 653-8234
                              Telecopy: (713) 951-9921

                                      144<PAGE>

                                                                    EXHIBIT 10.1

                               CREDIT AGREEMENT

                           DATED AS OF APRIL 27, 2001

                                     AMONG

                           ATP OIL & GAS CORPORATION
                                  AS BORROWER,

                                  BNP PARIBAS,
                            AS ADMINISTRATIVE AGENT,

                                      AND

                          THE LENDERS SIGNATORY HERETO

         $100,000,000 SENIOR SECURED REDUCING REVOLVING CREDIT FACILITY

                                  BNP PARIBAS,

                                  AS ARRANGER
<PAGE>

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                   Page
<S>                 <C>                                                             <C>
ARTICLE I           Definitions and Accounting Matters...........................    1
 Section 1.01       Terms Defined Above..........................................    1
 Section 1.02       Certain Defined Terms........................................    1
 Section 1.03       Accounting Terms and Determinations..........................   16

ARTICLE II          Commitments..................................................   16
 Section 2.01       Loans and Letters of Credit..................................   16
 Section 2.02       Borrowings, Continuations and Conversions, Letters of Credit.   17
 Section 2.03       Changes of Commitments.......................................   19
 Section 2.04       Fees.........................................................   19
 Section 2.05       Several Obligations..........................................   20
 Section 2.06       Notes........................................................   20
 Section 2.07       Prepayments..................................................   21
 Section 2.08       Borrowing Base and Monthly Reduction Amount..................   22
 Section 2.09       Assumption of Risks..........................................   24
 Section 2.10       Obligation to Reimburse and to Prepay........................   24
 Section 2.11       Lending Offices..............................................   26

ARTICLE III         Payments of Principal and Interest...........................   26
 Section 3.01       Repayment of Loans...........................................   26
 Section 3.02       Interest.....................................................   26

ARTICLE IV          Payments; Pro Rata Treatment; Computations; Etc..............   27
 Section 4.01       Payments.....................................................   27
 Section 4.02       Pro Rata Treatment...........................................   28
 Section 4.03       Computations.................................................   28
 Section 4.04       Non-receipt of Funds by the Administrative Agent.............   28
 Section 4.05       Set-off, Sharing of Payments, Etc............................   29
 Section 4.06       Taxes........................................................   30
 Section 4.07       Disposition of Proceeds......................................   32

ARTICLE V           Capital Adequacy and Additional Costs........................   33
 Section 5.01       Additional Costs.............................................   33
 Section 5.02       Limitation on LIBOR Loans....................................   34
 Section 5.03       Illegality...................................................   35
 Section 5.04       Base Rate Loans Pursuant to Sections 5.01, 5.02 and 5.03.....   35
 Section 5.05       Compensation.................................................   35
 Section 5.06       Replacement Lenders..........................................   36

ARTICLE VI          Conditions Precedent.........................................   37
 Section 6.01       Initial Funding..............................................   37
 Section 6.02       Initial and Subsequent Loans and Letters of Credit...........   38
 Section 6.03       Conditions Precedent for the Benefit of Lenders..............   39
</TABLE>

                                       i
<PAGE>

<TABLE>
<S>                 <C>                                                             <C>
 Section 6.04       No Waiver....................................................   39

ARTICLE VII         Representations and Warranties...............................   39
 Section 7.01       Corporate Existence..........................................   39
 Section 7.02       Financial Condition..........................................   40
 Section 7.03       Litigation...................................................   40
 Section 7.04       No Breach....................................................   40
 Section 7.05       Authority....................................................   40
 Section 7.06       Approvals....................................................   40
 Section 7.07       Use of Loans.................................................   41
 Section 7.08       ERISA........................................................   41
 Section 7.09       Taxes........................................................   42
 Section 7.10       Titles, etc..................................................   42
 Section 7.11       No Material Misstatements....................................   43
 Section 7.12       Investment Company Act.......................................   43
 Section 7.13       Public Utility Holding Company Act...........................   43
 Section 7.14       Subsidiaries.................................................   43
 Section 7.15       Location of Business and Offices.............................   43
 Section 7.16       Defaults.....................................................   43
 Section 7.17       Environmental Matters........................................   44
 Section 7.18       Compliance with the Law......................................   45
 Section 7.19       Insurance....................................................   45
 Section 7.20       Hedging Agreements...........................................   45
 Section 7.21       Restriction on Liens.........................................   46
 Section 7.22       Material Agreements..........................................   46
 Section 7.23       Gas Imbalances...............................................   46

ARTICLE VIII        Affirmative Covenants........................................   46
 Section 8.01       Reporting Requirements.......................................   46
 Section 8.02       Litigation...................................................   48
 Section 8.03       Maintenance, Etc.............................................   49
 Section 8.04       Environmental Matters........................................   50
 Section 8.05       Further Assurances...........................................   51
 Section 8.06       Performance of Obligations...................................   51
 Section 8.07       Engineering Reports..........................................   51
 Section 8.08       Title Information............................................   52
 Section 8.09       Collateral...................................................   53
 Section 8.10       ERISA Information and Compliance.............................   54
 Section 8.11       Post-Closing Matters.........................................   54

ARTICLE IX          Negative Covenants...........................................   55
 Section 9.01       Debt.........................................................   55
 Section 9.02       Liens........................................................   56
 Section 9.03       Investments, Loans and Advances..............................   56
 Section 9.04       Dividends, Distributions and Redemptions.....................   57
</TABLE>

                                       ii
<PAGE>

<TABLE>
<S>                 <C>                                                             <C>
 Section 9.05       Sales and Leasebacks.........................................   57
 Section 9.06       Nature of Business...........................................   58
 Section 9.07       Limitation on Leases.........................................   58
 Section 9.08       Mergers, Etc.................................................   58
 Section 9.09       Proceeds of Notes; Letters of Credit.........................   58
 Section 9.10       ERISA Compliance.............................................   58
 Section 9.11       Sale or Discount of Receivables..............................   59
 Section 9.12       Capital Expenditures.........................................   59
 Section 9.13       Current Ratio................................................   59
 Section 9.14       Debt Service Coverage Ratio..................................   60
 Section 9.15       Interest Coverage Ratio......................................   60
 Section 9.16       Sale of Oil and Gas Properties...............................   60
 Section 9.17       Environmental Matters........................................   60
 Section 9.18       Transactions with Affiliates.................................   60
 Section 9.19       Subsidiaries.................................................   60
 Section 9.20       Negative Pledge Agreements...................................   60
 Section 9.21       Gas Imbalances, Take-or-Pay or Other Prepayments.............   60
 Section 9.22       Senior Unsecured Notes.......................................   61

ARTICLE X           Events of Default; Remedies..................................   61
 Section 10.01      Events of Default............................................   61
 Section 10.02      Remedies.....................................................   63

ARTICLE XI          The Administrative Agent.....................................   64
 Section 11.01      Appointment, Powers and Immunities...........................   64
 Section 11.02      Reliance by Administrative Agent.............................   64
 Section 11.03      Defaults.....................................................   65
 Section 11.04      Rights as a Lender...........................................   65
 Section 11.05      Indemnification..............................................   65
 Section 11.06      Non-Reliance on Administrative Agent and other Lenders.......   65
 Section 11.07      Action by Administrative Agent...............................   66
 Section 11.08      Resignation or Removal of Administrative Agent...............   66

ARTICLE XII         Miscellaneous................................................   67
 Section 12.01      Waiver.......................................................   67
 Section 12.02      Notices......................................................   67
 Section 12.03      Payment of Expenses, Indemnities, etc........................   67
 Section 12.04      Amendments, Etc..............................................   70
 Section 12.05      Successors and Assigns.......................................   70
 Section 12.06      Assignments and Participations...............................   70
 Section 12.07      Invalidity...................................................   71
 Section 12.08      Counterparts.................................................   72
 Section 12.09      References; Use of Word "Including"..........................   72
 Section 12.10      Survival.....................................................   72
 Section 12.11      Captions.....................................................   72
 Section 12.12      No Oral Agreements...........................................   72
</TABLE>

                                      iii
<PAGE>

<TABLE>
<S>                 <C>                                                             <C>
 Section 12.13      Governing Law; Submission to Jurisdiction....................   72
 Section 12.14      Interest.....................................................   73
 Section 12.15      Confidentiality..............................................   74
</TABLE>

                                       iv
<PAGE>

ANNEXES, EXHIBITS AND SCHEDULES
Annex I        - List of Percentage Shares and Maximum Credit Amounts

Exhibit A      - Form of  Note
Exhibit B      - Form of Borrowing, Continuation and Conversion Request
Exhibit C      - Form of Compliance Certificate
Exhibit D      - List of Security Instruments
Exhibit E      - Form of Assignment Agreement

Schedule 7.02  - Liabilities
Schedule 7.03  - Litigation
Schedule 7.09  - Taxes
Schedule 7.10  - Titles, etc.
Schedule 7.14  - Subsidiaries
Schedule 7.17  - Environmental Matters
Schedule 7.19  - Insurance
Schedule 7.20  - Hedging Agreements
Schedule 7.22  - Material Agreements
Schedule 7.23  - Gas Imbalances
Schedule 9.01  - Debt
Schedule 9.02  - Liens
Schedule 9.03  - Investments, Loans and Advances

                                       v
<PAGE>

     THIS CREDIT AGREEMENT dated as of April 27, 2001 is among ATP OIL & GAS
CORPORATION a corporation formed under the laws of the State of Texas (the
"Borrower"); each of the lenders that is a signatory hereto or which becomes a
signatory hereto as provided in Section 12.06 (individually, together with its
successors and assigns, a "Lender" and, collectively, the "Lenders"); and BNP
PARIBAS, a financial institution formed under the laws of France (in its
individual capacity, "Paribas"), as agent for the Lenders (in such capacity,
together with its successors in such capacity, the "Administrative Agent").

                                R E C I T A L S

          A.   The Borrower has requested that the Lenders provide certain loans
     to and extensions of credit on behalf of the Borrower; and

          B.   The Lenders have agreed to make such loans and extensions of
     credit subject to the terms and conditions of this Agreement.

          C.   In consideration of the mutual covenants and agreements herein
     contained and of the loans, extensions of credit and commitments
     hereinafter referred to, the parties hereto agree as follows:

                                   ARTICLE I

                       DEFINITIONS AND ACCOUNTING MATTERS

     Section 1.01 Terms Defined Above. As used in this Agreement, the terms
"Administrative Agent," "Borrower," "Lender," "Lenders," and "Paribas" shall
have the meanings indicated above.

     Section 1.02 Certain Defined Terms. As used herein, the following terms
shall have the following meanings (all terms defined in this Article I or in
other provisions of this Agreement in the singular to have equivalent meanings
when used in the plural and vice versa):

          "Additional Costs" shall have the meaning assigned such term in
     Section 5.01(a).

          "Affected Loans" shall have the meaning assigned such term in Section
     5.04.

          "Affiliate" of any Person shall mean (i) any Person directly or
     indirectly controlled by, controlling or under common control with such
     first Person, (ii) any director or officer of such first Person or of any
     Person referred to in clause (i) above and (iii) if any Person in clause
     (i) above is an individual, any member of the immediate family (including
     parents, spouse and children) of such individual and any trust whose
     principal beneficiary is such individual or one or more members of such
     immediate family and any Person who is controlled by any such member or
     trust.  For purposes of this definition, any Person which owns directly or
     indirectly 10% or more of the securities having ordinary voting power for
     the election of directors or other governing body of a corporation or 10%
     or more of the partnership or other ownership interests of any other Person
     (other than as a limited partner of such other Person) will be deemed to

                                       1
<PAGE>

     "control" (including, with its correlative meanings, "controlled by" and
     "under common control with") such corporation or other Person.

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

          "Aggregate Commitments" at any time shall equal the amount calculated
     in accordance with Section 2.03.

          "Aggregate Maximum Credit Amounts" at any time shall equal the sum of
     the Maximum Credit Amounts of the Lenders, as the same may be reduced
     pursuant to Section 2.03(b).  As of the Closing Date, the Aggregate Maximum
     Credit Amounts equal $100,000,000.

          "Applicable Lending Office" shall mean, for each Lender and for each
     Type of Loan, the lending office of such Lender (or an Affiliate of such
     Lender) designated for such Type of Loan on the signature pages hereof or
     such other offices of such Lender (or of an Affiliate of such Lender) as
     such Lender may from time to time specify to the Administrative Agent and
     the Borrower as the office by which its Loans of such Type are to be made
     and maintained.

          "Applicable Margin" shall mean, at any time except as otherwise
     specifically set out in this definition, the applicable per annum
     percentage set forth at the appropriate intersection in the table shown
     below, based on the Borrowing Base Utilization as in effect from time to
     time:

        Borrowing Base Utilization                 Applicable Margin
        --------------------------          ------------------------------
                                            LIBOR Loans    Base Rate Loans
                                            -----------    ---------------
Less than 25%                                   1.50%            0.00%
Greater than or equal to 25%, but less          1.75%            0.00%
 than 50%
Greater than or equal to 50%, but less          2.00%            0.00%
 than 75%
Greater than or equal to 75%, but less          2.25%            0.25%
 than 85%
Greater than or equal to 85%                    2.75%            0.75%

; provided, however, if the issuance of the Senior Unsecured Debt has not
occurred on or before June 1, 2001, the "Applicable Margin" shall mean, for the
period from and after June 1, 2001 until, but excluding, the date of issuance of
the Senior Unsecured Debt, the applicable per annum percentage set forth at the
appropriate intersection in the table set forth below, based on the Borrowing
Base Utilization as in effect from time to time:

                                       2
<PAGE>

        Borrowing Base Utilization                  Applicable Margin
        --------------------------          -------------------------------
                                            LIBOR Loans     Base Rate Loans
                                            -----------     ---------------
Less than 25%                                 1.75%              0.25%
Greater than or equal to 25%, but less        2.00%              0.25%
 than 50%
Greater than or equal to 50%, but less        2.25%              0.25%
 than 75%
Greater than or equal to 75%, but less        2.50%              0.50%
 than 85%
Greater than or equal to 85%                  3.00%              1.00%

; further provided, however, at any time that a Borrowing Base Deficiency
exists, the "Applicable Margin" shall be increased by an additional 2.00% in
excess of the Applicable Margin that would otherwise apply if no Borrowing Base
Deficiency existed.

Each change in the Applicable Margin resulting from a change in the Borrowing
Base Utilization shall take effect on the day such change in the Borrowing Base
Utilization occurs.

     "Aquila Buy-Back" shall mean the acquisition by the Borrower of all
overriding royalty interests of Aquila Energy Capital Corporation in and to any
of the Oil and Gas Properties in which the Borrower owns an interest.

     "Assignment" shall have the meaning assigned such term in Section 12.06(b).

     "ATP (UK) " shall mean ATP Oil & Gas (UK) Ltd., a private limited company
formed under the laws of England and Wales.

     "Base Rate" shall mean, with respect to any Base Rate Loan, for any day,
the higher of (i) the Federal Funds Rate for any such day plus 1/2 of 1% or (ii)
the Prime Rate for such day.  Each change in any interest rate provided for
herein based upon the Base Rate resulting from a change in the Base Rate shall
take effect at the time of such change in the Base Rate.

     "Base Rate Loans" shall mean Loans that bear interest at rates based upon
the Base Rate.

     "Beneficiaries" shall mean the Administrative Agent, the Lenders, each
Issuing Bank and each Affiliate of a Lender that is a party to a Hedge Agreement
with the Borrower.

     "Borrowing Base" shall mean at any time an amount equal to the amount
determined in accordance with Section 2.08.

     "Borrowing Base Deficiency" shall mean, and occur at any time when, the
amount by which the aggregate outstanding principal amount of the Loans  plus
the LC Exposure exceeds the Borrowing Base, whether as the result of a
redetermination, a scheduled reduction, or otherwise.

                                       3
<PAGE>

     "Borrowing Base Utilization" shall mean at any time, an amount equal to the
quotient of (i) the aggregate principal amount of Loans outstanding plus LC
Exposure, divided by (ii) the Borrowing Base.

     "Business Day" shall mean any day other than a day on which commercial
banks are authorized or required to close in Houston, Texas or New York, New
York and, if such day relates to a borrowing or continuation of, a payment or
prepayment of principal of or interest on, or a conversion of or into, or the
Interest Period for, a LIBOR Loan or a notice by the Borrower with respect to
any such borrowing or continuation, payment, prepayment, conversion or Interest
Period, any day which is also a day on which dealings in Dollar deposits are
carried out in the London interbank market.

     "Change in Control" shall mean the occurrence of any of the following:

        (i)  the acquisition by any Person (or group of Persons acting together)
             of a direct or indirect interest in more than 30% of the voting
             power of the voting stock of the Borrower, by way of merger or
             consolidation or otherwise, or

        (ii) during any consecutive 12 month period, Continuing Directors cease
             to constitute a majority of the board of directors then in office.

     For purposes of this definition, any transfer of an equity interest of an
entity that was formed for the purpose of acquiring voting stock of the Borrower
will be deemed to be a transfer of such portion of such voting stock as
corresponds to the portion of the equity of such entity that has been so
transferred, and the acquisition of voting power of the voting stock of the
Borrower by any Subsidiary of the Borrower shall be disregarded.

     "Closing Date" shall mean April 27, 2001.

     "Closing Hedging Agreements" shall mean Hedging Agreements entered into by
the Borrower during April 2001 and listed in Schedule 7.20 with other existing
Hedging Agreements, in form and substance reasonably satisfactory to the
Administrative Agent, pursuant to which at least 6,000,000,000 Btu/day of the
Borrower's production from its Oil and Gas Properties is hedged for at least six
months during the period from and after the Closing Date until October 31, 2001
for a net realized price of not less than $5.40/MMBtu.

     "Code" shall mean the Internal Revenue Code of 1986, as amended from time
to time and any successor statute.

     "Commitment" shall mean, for any Lender, its obligation to make Loans and
to participate in the Letters of Credit as provided in Section 2.01(b) up to the
lesser of (i) such Lender's Maximum Credit Amount and (ii) such Lender's
Percentage Share of the amount equal to the then effective Borrowing Base.

     "Consolidated Net Income" shall mean with respect to the Borrower and its
Consolidated Subsidiaries, for any period, the aggregate of the net income (or
loss) of the Borrower and its Consolidated Subsidiaries after allowances for
taxes for such period, determined on a consolidated basis in accordance with
GAAP; provided that there shall be excluded from such

                                       4
<PAGE>

net income (to the extent otherwise included therein) the following: (i) the net
income of any Person in which the Borrower or any Consolidated Subsidiary has an
interest (which interest does not cause the net income of such other Person to
be consolidated with the net income of the Borrower and its Consolidated
Subsidiaries in accordance with GAAP), except to the extent of the amount of
dividends or distributions actually paid in such period by such other Person to
the Borrower or to a Consolidated Subsidiary, as the case may be; (ii) the net
income (but not loss) of any Consolidated Subsidiary to the extent that the
declaration or payment of dividends or similar distributions or transfers or
loans by that Consolidated Subsidiary is not at the time permitted by operation
of the terms of its charter or any agreement, instrument or Governmental
Requirement applicable to such Consolidated Subsidiary, or is otherwise
restricted or prohibited, in each case determined in accordance with GAAP; (iii)
the net income (or loss) of any Person acquired in a pooling-of-interests
transaction for any period prior to the date of such transaction; (iv) any
extraordinary gains or losses, including gains or losses attributable to
Property sales not in the ordinary course of business; and (v) the cumulative
effect of (A) a change in accounting principles and (B) any gains or losses
attributable to non-cash write-ups or write downs of assets.

     "Consolidated Subsidiaries" shall mean each Subsidiary of a Person (whether
now existing or hereafter created or acquired) the financial statements of which
shall be (or should have been) consolidated with the financial statements of
such Person in accordance with GAAP.    Unless otherwise indicated, each
reference to the term "Consolidated Subsidiary" shall mean a Subsidiary
consolidated with the Borrower.

     "Continuing Directors" shall mean any member of the board of directors of
the Borrower on the Closing Date, any director elected since the date thereof in
an annual meeting of the stockholders upon the recommendation of the board of
directors of the Borrower and any other member of the board of directors of the
Borrower who will be recommended or elected to succeed to a Continuing Director
by a majority of Continuing Directors who are then members of the board of
directors of the Borrower.

     "Debt" shall mean, for any Person and at any point in time, the sum of the
following (without duplication): (i) all obligations of such Person for borrowed
money or evidenced by bonds, debentures, notes or other similar instruments
(including principal, interest, fees and charges); (ii) all obligations of such
Person (whether contingent or otherwise) in respect of bankers' acceptances,
letters of credit, surety or other bonds and similar instruments; (iii) all
obligations of such Person to pay the deferred purchase price of Property or
services (other than for borrowed money); (iv) all obligations under leases
which shall have been, or should have been, in accordance with GAAP, recorded as
capital leases in respect of which such Person is liable (whether contingently
or otherwise); (v) all obligations under operating leases which require such
Person or its Affiliate to make payments over the term of such lease, including
payments at termination,  based on the purchase price or appraisal value of the
Property subject to such lease plus a marginal interest rate, and used primarily
as a financing vehicle for, or to monetize, such Property; (vi) all Debt (as
described in the other clauses of this definition) and other obligations of
others secured by a Lien on any asset of such Person, whether or not such Debt
is assumed by such Person; (vii) all Debt (as described in the other clauses of
this definition) and other obligations of others guaranteed by such Person or in
which such Person otherwise assures a creditor against loss of the debtor or
obligations of others; (viii) all obligations or undertakings of such Person to
maintain or cause to be maintained the financial

                                       5
<PAGE>

position or covenants of others or to purchase the Debt or Property of others;
(ix) obligations to deliver goods or services, including Hydrocarbons, in
consideration of advance payments, except as permitted by Section 9.16 and
disclosed pursuant to Section 8.07(c); (x) obligations to pay for goods or
services whether or not such goods or services are actually received or utilized
by such Person; (xi) any capital stock of such Person in which such Person has a
mandatory obligation to redeem such stock; (xii) any Debt of a Special Entity
for which such Person is liable either by agreement or because of a Governmental
Requirement; (xiii) the undischarged balance of any production payment created
by such Person or for the creation of which such Person directly or indirectly
received payment; and (xiv) the net financial exposure of such Person under all
then existing Hedging Agreements.

     "Debt Ratio" shall mean, as of the end of each fiscal quarter, the ratio of
(i) Debt of the Borrower and its Consolidated Subsidiaries as of the end of such
fiscal quarter, less cash on hand exceeding $10,000,000 to (ii) EBITDA (less
interest income) for the immediately preceding four fiscal quarters ending on
such date.

     "Default" shall mean an Event of Default or an event which with notice or
lapse of time or both would become an Event of Default.

     "Dollars" and "$" shall mean lawful money of the United States of America.

     "EBITDA" shall mean, for any period, the sum of Consolidated Net Income for
such period plus the following expenses or charges to the extent deducted from
Consolidated Net Income in such period: interest, taxes, depreciation, depletion
and amortization.

     "Engineering Reports" shall have the meaning assigned such term in Section
2.08.

     "Environmental Laws" shall mean any and all Governmental Requirements
pertaining to health or the environment in effect in any and all jurisdictions
in which the Borrower or any Subsidiary is conducting or at any time has
conducted business, or where any Property of the Borrower or any Subsidiary is
located, including without limitation, the Oil Pollution Act of 1990 ("OPA"),
the Clean Air Act, as amended, the Comprehensive Environmental, Response,
Compensation, and Liability Act of 1980 ("CERCLA"), as amended, the Federal
Water Pollution Control Act, as amended, the Occupational Safety and Health Act
of 1970, as amended, the Resource Conservation and Recovery Act of 1976
("RCRA"), as amended, the Safe Drinking Water Act, as amended, the Toxic
Substances Control Act, as amended, the Superfund Amendments and Reauthorization
Act of 1986, as amended, the Hazardous Materials Transportation Act, as amended,
and other environmental conservation or protection laws.  The term "oil" shall
have the meaning specified in OPA, the terms "hazardous substance" and "release"
(or "threatened release") have the meanings specified in CERCLA, and the terms
"solid waste" and "disposal" (or "disposed") have the meanings specified in
RCRA; provided, however, that (i) in the event either OPA, CERCLA or RCRA is
amended so as to broaden the meaning of any term defined thereby, such broader
meaning shall apply subsequent to the effective date of such amendment and (ii)
to the extent the laws of the state in which any Property of the Borrower or any
Subsidiary is located establish a meaning for "oil," "hazardous substance,"
"release," "solid waste" or "disposal" which is broader than that specified in
either OPA, CERCLA or RCRA, such broader meaning shall apply.

                                       6
<PAGE>

     "ERISA" shall mean the Employee Retirement Income Security Act of 1974, as
amended from time to time and any successor statute.

     "ERISA Affiliate" shall mean each trade or business (whether or not
incorporated) which together with the Borrower or any Subsidiary would be deemed
to be a "single employer" within the meaning of section 4001(b)(1) of ERISA or
subsections (b), (c), (m) or (o) of section 414 of the Code.

     "ERISA Event" shall mean (i) a "Reportable Event" described in Section 4043
of ERISA and the regulations issued thereunder, (ii) the withdrawal of the
Borrower, any Subsidiary or any ERISA Affiliate from a Plan during a plan year
in which it was a "substantial employer" as defined in Section 4001(a)(2) of
ERISA, (iii) the filing of a notice of intent to terminate a Plan or the
treatment of a Plan amendment as a termination under Section 4041 of ERISA, (iv)
the institution of proceedings to terminate a Plan by the PBGC or (v) any other
event or condition which might constitute grounds under Section 4042 of ERISA
for the termination of, or the appointment of a trustee to administer, any Plan.

     "Event of Default" shall have the meaning assigned such term in Section
10.01.

     "Excepted Liens" shall mean:  (i) Liens for taxes, assessments or other
governmental charges or levies not yet due or which are being contested in good
faith by appropriate action and for which adequate reserves have been
maintained; (ii) Liens in connection with workmen's compensation, unemployment
insurance or other social security, old age pension or public liability
obligations not yet due or which are being contested in good faith by
appropriate action and for which adequate reserves have been maintained in
accordance with GAAP; (iii) operators', vendors', carriers', warehousemen's,
repairmen's, mechanics', workmen's, materialmen's, construction or other like
Liens arising by operation of law in the ordinary course of business or incident
to the exploration, development, operation and maintenance of Oil and Gas
Properties or statutory landlord's liens, each of which is in respect of
obligations that have not been outstanding more than 90 days or which are being
contested in good faith by appropriate proceedings and for which adequate
reserves have been maintained in accordance with GAAP; (iv) any Liens reserved
in leases or farmout agreements for rent or royalties and for compliance with
the terms of the farmout agreements or leases in the case of leasehold estates,
to the extent that any such Lien referred to in this clause does not materially
impair the use of the Property covered by such Lien for the purposes for which
such Property is held by the Borrower or any Subsidiary or materially impair the
value of such Property subject thereto; (v) encumbrances (other than to secure
the payment of borrowed money or the deferred purchase price of Property or
services), easements, restrictions, servitudes, permits, conditions, covenants,
exceptions or reservations in any rights of way or other Property of the
Borrower or any Subsidiary for the purpose of roads, pipelines, transmission
lines, transportation lines, distribution lines for the removal of gas, oil,
coal or other minerals or timber, and other like purposes, or for the joint or
common use of real estate, rights of way, facilities and equipment, and defects,
irregularities, zoning restrictions and deficiencies in title of any rights of
way or other Property which in the aggregate do not materially impair the use of
such rights of way or other Property for the purposes of which such rights of
way and other Property are held by the Borrower or any Subsidiary or materially
impair the value of such Property subject thereto; (vi) deposits of cash or
securities to secure the performance of bids, trade contracts, leases, statutory

                                       7
<PAGE>

obligations and other obligations of a like nature incurred in the ordinary
course of business; and (vii) Liens permitted by the Security Instruments.

     "Federal Funds Rate" shall mean, for any day, the rate per annum (rounded
upwards, if necessary, to the nearest 1/100 of 1%) equal to the weighted average
of the rates on overnight federal funds transactions with a member of the
Federal Reserve System arranged by federal funds brokers on such day, as
published by the Federal Reserve Bank of New York on the Business Day next
succeeding such day, provided that (i) if the date for which such rate is to be
determined is not a Business Day, the Federal Funds Rate for such day shall be
such rate on such transactions on the next preceding Business Day as so
published on the next succeeding Business Day, and (ii) if such rate is not so
published for any day, the Federal Funds Rate for such day shall be the average
rate charged to the Administrative Agent on such day on such transactions as
determined by the Administrative Agent.

     "Fee Letter" shall mean that certain letter agreement between the
Administrative Agent and the Borrower, dated as of even date with this
Agreement, concerning certain fees in connection with this Agreement and any
agreements or instruments executed in connection therewith, as the same may be
amended or replaced from time to time.

     "Financial Statements" shall mean the financial statement or statements of
the Borrower and its Consolidated Subsidiaries described or referred to in
Section 7.02.

     "GAAP" shall mean generally accepted accounting principles in the United
States of America in effect from time to time.

     "Governmental Authority" shall include the country, the state, county, city
and political subdivisions in which any Person or such Person's Property is
located or which exercises valid jurisdiction over any such Person or such
Person's Property, and any court, agency, department, commission, board, bureau
or instrumentality of any of them including monetary authorities which exercises
valid jurisdiction over any such Person or such Person's Property.  Unless
otherwise specified, all references to Governmental Authority herein shall mean
a Governmental Authority having jurisdiction over, where applicable, the
Borrower, its Subsidiaries or any of their Property or the Administrative Agent,
any Lender or any Applicable Lending Office.

     "Governmental Requirement" shall mean any law, statute, code, ordinance,
order, determination, rule, regulation, judgment, decree, injunction, franchise,
permit, certificate, license, authorization or other directive or requirement
(whether or not having the force of law), including, without limitation,
Environmental Laws, energy regulations and occupational, safety and health
standards or controls, of any Governmental Authority.

     "Hedging Agreements" shall mean any commodity, interest rate or currency
swap, cap, floor, collar, forward agreement or other exchange or protection
agreements or any option with respect to any such transaction.

     "Highest Lawful Rate" shall mean, with respect to each Lender, the maximum
nonusurious interest rate, if any, that at any time or from time to time may be
contracted for, taken, reserved, charged or received on the Notes or on any
other Obligations under laws applicable to such Lender which are presently in
effect or, to the extent allowed by law, under

                                       8
<PAGE>

such applicable laws which may hereafter be in effect and which allow a higher
maximum nonusurious interest rate than applicable laws now allow.

     "Hydrocarbon Interests" shall mean all rights, titles, interests and
estates now or hereafter acquired in and to oil and gas leases, oil, gas and
mineral leases, or other liquid or gaseous hydrocarbon leases, mineral fee
interests, overriding royalty and royalty interests, net profit interests and
production payment interests, including any reserved or residual interests of
whatever nature.

     "Hydrocarbons" shall mean oil, gas, casinghead gas, drip gasoline, natural
gasoline, condensate, distillate, liquid hydrocarbons, gaseous hydrocarbons and
all products refined or separated therefrom.

     "Indemnified Parties" shall have the meaning assigned such term in Section
12.03(a)(ii).

     "Indemnity Matters" shall mean any and all actions, suits, proceedings
(including any investigations, litigation or inquiries), claims, demands and
causes of action made or threatened against a Person and, in connection
therewith, all losses, liabilities, damages (including, without limitation,
consequential damages) or reasonable costs and expenses of any kind or nature
whatsoever incurred by such Person whether caused by the sole or concurrent
negligence of such Person seeking indemnification.

     "Initial Funding" shall mean the funding of the initial Loans or issuance
of the initial Letters of Credit upon satisfaction of the conditions set forth
in Sections 6.01 and 6.02.

     "Initial Reserve Reports" shall mean the reports of (i) Ryder Scott
Company, dated October 31, 2000 and December 31, 2000, (ii) Holditch-Reservoir
Technologies dated December 31, 2000 and (iii) Atwater Consultants Ltd., dated
January 1, 2001, with respect to the Oil and Gas Properties then owned or being
acquired by the Borrower, copies of which have been delivered to the
Administrative Agent.

     "Interest Coverage Ratio" shall mean, as of the end of each fiscal quarter,
the ratio of (i) EBITDA for the immediately preceding four fiscal quarters
ending on such date to (ii) cash interest payments made by the Borrower and its
Consolidated Subsidiaries for such four fiscal quarters.

     "Interest Period" shall mean, with respect to any LIBOR Loan, the period
commencing on the date such LIBOR Loan is made and ending on the numerically
corresponding day in the first, second, third or sixth calendar month
thereafter, as the Borrower may select as provided in Section 2.02 (or such
longer period as may be requested by the Borrower and agreed to by the Majority
Lenders), except that each Interest Period which commences on the last Business
Day of a calendar month (or on any day for which there is no numerically
corresponding day in the appropriate subsequent calendar month) shall end on the
last Business Day of the appropriate subsequent calendar month.

     Notwithstanding the foregoing:  (i) no Interest Period may end after the
Termination Date; (ii) each Interest Period which would otherwise end on a day
which is not a Business Day shall end on the next succeeding Business Day (or,
if such next succeeding Business Day falls in

                                       9
<PAGE>

the next succeeding calendar month, on the next preceding Business Day); and
(iii) no Interest Period shall have a duration of less than one month and, if
the Interest Period for any LIBOR Loans would otherwise be for a shorter period,
such Loans shall not be available hereunder.

     "Issuing Bank" shall mean Paribas or any other Lender agreed to among the
Borrower and the Administrative Agent to issue Letters of Credit.

     "LC Commitment" at any time shall mean $15,000,000.

     "LC Exposure" at any time shall mean the difference between (i) the
aggregate face amount of all undrawn and uncancelled Letters of Credit plus the
aggregate of all amounts drawn under all Letters of Credit and not yet
reimbursed, minus (ii) the aggregate amount of all cash securing outstanding
Letters of Credit pursuant to Section 2.10(b).

     "Lender Termination Date" shall have the meaning assigned to such term in
Section 5.06(c).

     "Letter of Credit Agreements" shall mean the written agreements with the
Issuing Bank, as issuing lender for any Letter of Credit, executed in connection
with the issuance by the Issuing Bank of the Letters of Credit, such agreements
to be on the Issuing Bank's customary form for letters of credit of comparable
amount and purpose as from time to time in effect or as otherwise agreed to by
the Borrower and the Issuing Bank.

     "Letters of Credit" shall mean the letters of credit issued pursuant to
Section 2.01(b) and all reimbursement obligations pertaining to any such letters
of credit, and "Letter of Credit" shall mean any one of the Letters of Credit
and the reimbursement obligations pertaining thereto.

     "LIBOR Loans" shall mean Loans the interest rates on which are determined
on the basis of rates referred to in the definition of "LIBOR Rate".

     "LIBOR" shall mean the rate of interest determined on the basis of the rate
for deposits in Dollars for a period equal to the applicable Interest Period
commencing on the first day of such Interest Period appearing on Dow Jones
Market Service Page 3750 (or any successor page) as of 11:00 a.m. (London time)
two Business Days prior to the first day of the applicable Interest Period.  In
the event that such rate does not appear on Dow Jones Market Service Page 3750
(or a successor page), "LIBOR" shall be determined by the Administrative Agent
to be the rate per annum at which deposits in Dollars are offered by leading
reference banks in the London interbank market to Paribas at approximately 11:00
a.m. (London time) two Business Days prior to the first day of the applicable
Interest Period for a period equal to such Interest Period and in an amount
substantially equal to the amount of the applicable Loan.

     "LIBOR Loans" shall mean Loans the interest rates on which are determined
on the basis of rates referred to in the definition of "LIBOR Rate".

     "LIBOR Rate" shall mean, with respect to any LIBOR Loan, a rate per annum
(rounded upwards, if necessary, to the nearest 1/100 of 1%) determined by the
Administrative Agent to be equal to the quotient of (i) LIBOR for such Loan for
the Interest Period for such Loan divided by (ii) 1 minus the Reserve
Requirement for such Loan for such Interest Period.

                                       10
<PAGE>

     "Lien" shall mean any interest in Property securing an obligation owed to,
or a claim by, a Person other than the owner of the Property, whether such
interest is based on the common law, statute or contract, and whether such
obligation or claim is fixed or contingent, and including but not limited to (i)
the lien or security interest arising from a mortgage, encumbrance, pledge,
security agreement, conditional sale or trust receipt or a lease, consignment or
bailment for security purposes or (ii) production payments and the like payable
out of Oil and Gas Properties.  The term "Lien" shall include reservations,
exceptions, encroachments, easements, rights of way, covenants, conditions,
restrictions, leases and other title exceptions and encumbrances affecting
Property.  For the purposes of this Agreement, the Borrower or any Subsidiary
shall be deemed to be the owner of any Property which it has acquired or holds
subject to a conditional sale agreement, or leases under a financing lease or
other arrangement pursuant to which title to the Property has been retained by
or vested in some other Person in a transaction intended to create a financing.

     "Loan Documents" shall mean this Agreement, the Notes, the Fee Letter, all
Letters of Credit, all Letter of Credit Agreements, the Security Instruments and
any other document expressly indicating therein that such document is a "Loan
Document" under this Agreement.

     "Loans" shall mean the loans as provided for by Section 2.01(a).

     "Majority Lenders" shall mean, at any time while no Loans are outstanding,
Lenders having at least sixty-six and two-thirds percent (66-2/3%) of the
Aggregate Commitments and, at any time while Loans are outstanding, Lenders
holding at least sixty-six and two-thirds percent (66-2/3%) of the outstanding
aggregate principal amount of the Loans (without regard to any sale by a Lender
of a participation in any Loan under Section 12.06(c)).

     "Material Adverse Effect" shall mean any set of circumstances or events
that (i) has or could reasonably be expected to have any material and adverse
effect whatsoever upon, or result in or reasonably be expected to result in a
material adverse change in, (A) the assets, liabilities, financial condition,
business, operations or affairs of the Borrower and its Subsidiaries taken as a
whole different from those reflected in the Financial Statements or from the
facts represented or warranted in any Loan Document, or (B) the ability of the
Borrower and its Subsidiaries taken as a whole to carry out their business as at
the Closing Date or as proposed as of the Closing Date to be conducted or meet
their obligations under the Loan Documents on a timely basis, (ii) impairs
materially or could be reasonably expected to impair materially the ability of
the Borrower and its Subsidiaries to duly and punctually pay and perform their
obligations under the Loan Documents or (iii) impairs materially or could
reasonably be expected to impair materially the ability of the Administrative
Agent or any of the Lenders, to the extent permitted, to enforce its legal
remedies pursuant to the Loan Documents.

     "Maximum Credit Amount" shall mean, as to each Lender, the amount set forth
opposite such Lender's name on Annex I under the caption "Maximum Credit
Amounts" (as the same may be reduced pursuant to Section 2.03(b) pro rata to
each Lender based on its Percentage Share), as modified from time to time to
reflect any assignments permitted by Section 12.06(b).

     "Monthly Reduction Amount" shall mean the amount by which the Borrowing
Base shall automatically reduce on the first day of each calendar month,
commencing June 1, 2001, as determined by the Administrative Agent and the
Lenders in accordance with Section 2.08.

                                       11
<PAGE>

     "Mortgaged Property" shall mean the Property owned by the Borrower and
which is subject to the Liens existing and to exist under the terms of the
Security Instruments.

     "Multiemployer Plan" shall mean a Plan defined as such in Section 3(37) or
4001(a)(3) of ERISA.

     "Notes" shall mean the Notes provided for by Section 2.06, together with
any and all renewals, extensions for any period, increases, rearrangements,
substitutions or modifications thereof.

     "Notice of Termination" shall have the meaning assigned to such term in
Section 5.06(a).

     "Obligations" shall mean all indebtedness, obligations and liabilities of
the Borrower or any Subsidiary to any of the Lenders, any of the Lenders'
Affiliates, the Administrative Agent, or the Issuing Bank, individually or
collectively, existing on the date of this Agreement or arising thereafter,
direct or indirect, joint or several, absolute or contingent, matured or
unmatured, liquidated or unliquidated, secured or unsecured, arising or incurred
under any Hedge Agreement, under this Agreement or any of the other Loan
Documents or in respect of any of the Loans made or reimbursement obligations
incurred or any of the Notes, Letters of Credit or other instruments at any time
evidencing any thereof, including interest accruing subsequent to the filing of
a petition or other action concerning bankruptcy or other similar proceedings,
and all renewals, extensions, refinancings and replacements for the foregoing.

     "Oil and Gas Properties" shall mean Hydrocarbon Interests; the Properties
now or hereafter pooled or unitized with Hydrocarbon Interests; all presently
existing or future unitization, pooling agreements and declarations of pooled
units and the units created thereby (including without limitation all units
created under orders, regulations and rules of any Governmental Authority) which
may affect all or any portion of the Hydrocarbon Interests; all operating
agreements, contracts and other agreements which relate to any of the
Hydrocarbon Interests or the production, sale, purchase, exchange or processing
of Hydrocarbons from or attributable to such Hydrocarbon Interests; all
Hydrocarbons in and under and which may be produced and saved or attributable to
the Hydrocarbon Interests, including all oil in tanks, the lands covered thereby
and all rents, issues, profits, proceeds, products, revenues and other incomes
from or attributable to the Hydrocarbon Interests; all tenements, hereditaments,
appurtenances and Properties in any manner appertaining, belonging, affixed or
incidental to the Hydrocarbon Interests; and all Properties, rights, titles,
interests and estates described or referred to above, including any and all
Property, real or personal, now owned or hereafter acquired and situated upon,
used, held for use or useful in connection with the operation, production or
development of any of such Hydrocarbon Interests or Property (excluding drilling
rigs, automotive equipment or other personal property which may be on such
premises for the purpose of drilling a well or for other temporary uses) and
including any and all oil wells, gas wells, injection wells or other wells,
buildings, structures, fuel separators, liquid extraction plants, plant
compressors, pumps, pumping units, field gathering systems, tanks and tank
batteries, fixtures, valves, fittings, machinery and parts, engines, boilers,
meters, apparatus, equipment, appliances, tools, implements, cables, wires,
towers, casing, tubing and rods, surface leases, rights-of-way, easements and
servitudes together with all additions, substitutions, replacements, accessions
and attachments to any and all of the foregoing.

                                       12
<PAGE>

     "Other Taxes" shall have the meaning assigned such term in Section 4.06(b).

     "PBGC" shall mean the Pension Benefit Guaranty Corporation or any entity
succeeding to any or all of its functions.

     "Percentage Share" shall mean the percentage of the Aggregate Commitments
to be provided by a Lender under this Agreement as indicated on Annex I hereto,
as modified from time to time to reflect any assignments permitted by Section
12.06(b).

     "Person" shall mean any individual, corporation, company, voluntary
association, partnership, joint venture, trust, unincorporated organization or
government or any agency, instrumentality or political subdivision thereof, or
any other form of entity.

     "Plan" shall mean any employee pension benefit plan, as defined in Section
3(2) of ERISA, which (i) is currently or hereafter sponsored, maintained or
contributed to by the Borrower, any Subsidiary or an ERISA Affiliate or (ii) was
at any time during the preceding six calendar years sponsored, maintained or
contributed to, by the Borrower, any Subsidiary or an ERISA Affiliate.

     "Post-Default Rate" shall mean, in respect of any principal of any Loan or
any other amount payable by the Borrower under this Agreement or any other Loan
Document , a rate per annum during the period commencing on the date of
occurrence of an Event of Default until such amount is paid in full or all
Events of Default are cured or waived equal to 2% per annum above the Base Rate
as in effect from time to time plus the Applicable Margin (if any), but in no
event to exceed the Highest Lawful Rate; provided, however, for a LIBOR Loan,
the "Post-Default Rate" for such principal shall be, for the period commencing
on the date of occurrence of an Event of Default and ending on the earlier to
occur of the last day of the Interest Period therefor or the date all Events of
Default are cured or waived, 2% per annum above the interest rate for such Loan
as provided in Section 3.02(a)(ii), but in no event to exceed the Highest Lawful
Rate.

     "Prime Rate" shall mean the rate of interest from time to time announced
publicly by the Administrative Agent at the Principal Office as its prime
commercial lending rate.  Such rate is set by the Administrative Agent as a
general reference rate of interest, taking into account such factors as the
Administrative Agent may deem appropriate, it being understood that many of the
Administrative Agent's commercial or other loans are priced in relation to such
rate, that it is not necessarily the lowest or best rate actually charged to any
customer and that the Administrative Agent may make various commercial or other
loans at rates of interest having no relationship to such rate.

     "Principal Office" shall mean the principal office of the Administrative
Agent, presently located at 1200 Smith Street, Suite 3100, Houston, Texas 77002.

     "Property" shall mean any interest in any kind of property or asset,
whether real, personal or mixed, or tangible or intangible.

     "Quarterly Dates" shall mean the last day of each March, June, September,
and December, in each year, the first of which shall be June 30, 2001; provided,
however, that if any such day is not a Business Day, such Quarterly Date shall
be the next succeeding Business Day.

                                       13
<PAGE>

     "Redetermination Date" shall mean the date that the redetermined Borrowing
Base becomes effective subject to the notice requirements specified in Section
2.08(e) both for scheduled redeterminations and unscheduled redeterminations.

     "Regulation D" shall mean Regulation D of the Board of Governors of the
Federal Reserve System (or any successor), as the same may be amended or
supplemented from time to time.

     "Regulatory Change" shall mean, with respect to any Lender, any change
after the Closing Date in any Governmental Requirement (including Regulation D)
or the adoption or making after such date of any interpretations, directives or
requests applying to a class of lenders (including such Lender or its Applicable
Lending Office) of or under any Governmental Requirement (whether or not having
the force of law) by any Governmental Authority charged with the interpretation
or administration thereof.

     "Replacement Lenders" shall have the meaning assigned to such term in
Section 5.06(b).

     "Required Payment" shall have the meaning assigned such term in Section
4.04.

     "Reserve Report" shall mean a report, in form and substance satisfactory to
the Administrative Agent, setting forth, as of each January 1 (or such other
date in the event of an unscheduled redetermination or the redetermination
scheduled to occur on or around July 31, 2001); (i) the oil and gas reserves
attributable to the Borrower's Oil and Gas Properties together with a projection
of the rate of production and future net income, taxes, operating expenses and
capital expenditures with respect thereto as of such date, based upon the
pricing assumptions provided by the Administrative Agent and consistent with
pricing assumptions used in connection with credit facilities of a similar
nature extended to other borrowers similarly situated and (ii) such other
information as the Administrative Agent may reasonably request.  The term
"Reserve Report" shall also include the information to be provided by the
Borrower as of July 1 of each year pursuant to Section 8.07(a).

     "Reserve Requirement" shall mean, for any Interest Period for any LIBOR
Loan, the average maximum rate at which reserves (including any marginal,
supplemental or emergency reserves) are required to be maintained during such
Interest Period under Regulation D by member banks of the Federal Reserve System
in New York City with deposits exceeding one billion Dollars against
"Eurocurrency liabilities" (as such term is used in Regulation D).  Without
limiting the effect of the foregoing, the Reserve Requirement shall reflect any
other reserves required to be maintained by such member banks by reason of any
Regulatory Change against (i) any category of liabilities which includes
deposits by reference to which LIBOR is to be determined as provided in the
definition of "LIBOR" or (ii) any category of extensions of credit or other
assets which include a LIBOR Loan.

     "Responsible Officer" shall mean, as to any Person, the Chief Executive
Officer, the President or any Vice President of such Person and, with respect to
financial matters, the term "Responsible Officer" shall include the Chief
Financial Officer of such Person.  Unless otherwise specified, all references to
a Responsible Officer herein shall mean a Responsible Officer of the Borrower.

                                       14
<PAGE>

     "Scheduled Redetermination Date" shall have the meaning assigned to such
term in Section 2.08(d).

     "SEC" shall mean the Securities and Exchange Commission or any successor
Governmental Authority.

     "Security Instruments" shall mean the Letters of Credit, Letter of Credit
Agreements, the agreements or instruments described or referred to in Exhibit D,
and any and all other agreements or instruments now or hereafter executed and
delivered by the Borrower or any other Person (other than participation or
similar agreements between any Lender and any other lender or creditor with
respect to any Obligations pursuant to this Agreement) in connection with, or as
security for the payment or performance of, the Notes, this Agreement, or
reimbursement obligations under the Letters of Credit, as such agreements may be
amended, supplemented or restated from time to time.

     "Senior Unsecured Debt" shall mean the Senior Unsecured Debt of up to
$150,000,000 issued pursuant to terms approved by the Administrative Agent
(which approval will not be unreasonably withheld or delayed).

     "Special Entity" shall mean any joint venture, limited liability company or
partnership, general or limited partnership or any other type of partnership or
company other than a corporation in which a Person or one or more of its other
Subsidiaries is a member, owner, partner or joint venturer and owns, directly or
indirectly, at least a majority of the equity of such entity or controls such
entity, but excluding any tax partnerships that are not classified as
partnerships under state law.  For purposes of this definition, any Person which
owns directly or indirectly an equity investment in another Person which allows
the first Person to manage or elect managers who manage the normal activities of
such second Person will be deemed to "control" such second Person (e.g. a sole
general partner controls a limited partnership).

     "Subsidiary" shall mean (i) any corporation of which at least a majority of
the outstanding shares of stock having by the terms thereof ordinary voting
power to elect a majority of the board of directors of such corporation
(irrespective of whether or not at the time stock of any other class or classes
of such corporation shall have or might have voting power by reason of the
happening of any contingency) is at the time directly or indirectly owned or
controlled by another Person or one or more of such Person's Subsidiaries or by
such Person and one or more of its Subsidiaries and (ii) any Special Entity.
Unless otherwise indicated herein, each reference to the term "Subsidiary" shall
mean a Subsidiary of the Borrower.

     "Taxes" shall have the meaning assigned such term in Section 4.06(a).

     "Terminated Lender" shall have the meaning assigned to such term in Section
5.06(a).

     "Termination Date" shall mean the earlier to occur of (i) December 31, 2003
or (ii) the date that the Commitments are sooner terminated pursuant to Sections
2.03(b) or 10.02.

     "Transfer" shall mean any sale, assignment, farm-out, conveyance or other
transfer of any Oil and Gas Property, or any interest in any Oil and Gas
Property (including, without limitation, any working interest, overriding
royalty interest, production payments, net profits

                                       15
<PAGE>

interest, royalty interest, or mineral fee interest) of the Borrower or ATP
(UK), except for (i) the sale of Hydrocarbons in the ordinary course of
business, (ii) the sale or transfer of equipment that is (A) obsolete, worn out,
depleted or uneconomic and disposed of in the ordinary course of business, (B)
no longer necessary for the business of the Borrower or ATP (UK) or (C)
contemporaneously replaced by equipment of at least comparable value and use,
and (iii) the sale, in any one fiscal year of Oil and Gas Properties of the
Borrower or ATP (UK) which in the aggregate have a fair market value of $250,000
or less.

     "Type" shall mean, with respect to any Loan, a Base Rate Loan or a LIBOR
Loan.

     Section 1.03 Accounting Terms and Determinations. Unless otherwise
specified herein, all accounting terms used herein shall be interpreted, all
determinations with respect to accounting matters hereunder shall be made, and
all financial statements and certificates and reports as to financial matters
required to be furnished to the Administrative Agent or the Lenders hereunder
shall be prepared, in accordance with GAAP, applied on a basis consistent with
the audited financial statements of the Borrower referred to in Section 7.02
(except for changes concurred with by the Borrower's independent public
accountants).

                                  ARTICLE II

                                  COMMITMENTS

     Section 2.01  Loans and Letters of Credit.

          (a) Loans.  Each Lender severally agrees, on the terms and conditions
     of this Agreement, to make loans to the Borrower during the period from and
     including (i) the Closing Date or (ii) such later date that such Lender
     becomes a party to this Agreement as provided in Section 12.06(b), to and
     up to, but excluding, the Termination Date in an aggregate principal amount
     at any one time outstanding up to, but not exceeding, the amount of such
     Lender's Commitment as then in effect; provided, however, that the
     aggregate principal amount of all such Loans by all Lenders hereunder at
     any one time outstanding together with the LC Exposure shall not exceed the
     Aggregate Commitments.  Subject to the terms of this Agreement, during the
     period from the Closing Date to and up to, but excluding, the Termination
     Date, the Borrower may borrow, repay and reborrow the amount described in
     this Section 2.01(a).

          (b) Letters of Credit.  During the period from and including the
     Closing Date to, but excluding, the Termination Date, the Issuing Bank, as
     issuing bank for the Lenders, agrees to extend credit for the account of
     the Borrower or any Subsidiary at any time and from time to time by
     issuing, renewing, extending or reissuing Letters of Credit; provided,
     however, the LC Exposure at any one time outstanding shall not exceed the
     lesser of (i) the LC Commitment or (ii) the Aggregate Commitments, as then
     in effect, minus the aggregate principal amount of all Loans and the LC
     Exposure then outstanding.  The Lenders shall participate in such Letters
     of Credit according to their respective Percentage Shares.  Each of the
     Letters of Credit shall (i) be issued by the Issuing Bank, (ii) contain
     such terms and provisions as are reasonably required by the Issuing Bank,

                                       16
<PAGE>

     (iii) be for the account of the Borrower or a Subsidiary and (iv) expire
     not later than two (2) days before the Termination Date.

          (c) Limitation on Types of Loans.  Subject to the other terms and
     provisions of this Agreement, at the option of the Borrower, the Loans may
     be Base Rate Loans or LIBOR Loans; provided that, without the prior written
     consent of the Majority Lenders, no more than six (6) LIBOR Loans may be
     outstanding at any time.

     Section 2.02 Borrowings, Continuations and Conversions, Letters of Credit.

          (a) Borrowings.  The Borrower shall give the Administrative Agent
     (which shall promptly notify the Lenders) advance notice as hereinafter
     provided of each borrowing hereunder, which shall specify (i) the aggregate
     amount of such borrowing, (ii) the Type and (iii) the date (which shall be
     a Business Day) of the Loans to be borrowed, and (iv) in the case of LIBOR
     Loans, the duration of the Interest Period therefor.

          (b) Minimum Amounts.  All Base Rate Loan borrowings shall be in
     amounts of at least $1,000,000 or the remaining balance of the Aggregate
     Commitments, if less, or any whole multiple of $500,000 in excess thereof,
     and all LIBOR Loans shall be in amounts of at least $5,000,000 or any whole
     multiple of $1,000,000 in excess thereof.

          (c) Notices. All borrowings, continuations and conversions shall
     require advance written notice to the Administrative Agent (which shall
     promptly notify the Lenders) in the form of Exhibit B  (or telephonic
     notice promptly confirmed by such a written notice), which in each case
     shall be irrevocable, from the Borrower to be received by the
     Administrative Agent not later than 11:00 a.m. Houston, Texas time at least
     one Business Day prior to the date of each Base Rate Loan borrowing and
     three Business Days prior to the date of each LIBOR Loan borrowing,
     continuation or conversion.  Without in any way limiting the Borrower's
     obligation to confirm in writing any telephonic notice, the Administrative
     Agent may act without liability upon the basis of telephonic notice
     believed by the Administrative Agent in good faith to be from the Borrower
     prior to receipt of written confirmation.  In each such case, the Borrower
     hereby waives the right to dispute the Administrative Agent's record of the
     terms of such telephonic notice except in the case of gross negligence or
     willful misconduct by the Administrative Agent.

          (d) Continuation Options.  Subject to the provisions made in this
     Section 2.02(d), the Borrower may elect to continue all or any part of any
     LIBOR Loan beyond the expiration of the then current Interest Period
     relating thereto by giving advance notice as provided in Section 2.02(c) to
     the Administrative Agent (which shall promptly notify the Lenders) of such
     election, specifying the amount of such Loan to be continued and the
     Interest Period therefor.  In the absence of such a timely and proper
     election, the Borrower shall be deemed to have elected to convert such
     LIBOR Loan to a Base Rate Loan pursuant to Section 2.02(e).  All or any
     part of any LIBOR Loan may be continued as provided herein, provided that
     (i) any continuation of any such Loan shall be (as to each Loan as
     continued for an applicable Interest Period) in amounts of at least
     $3,000,000 or any whole multiple of $1,000,000 in excess thereof and (ii)
     no Default shall have occurred and be continuing.  If a Default shall have
     occurred and be

                                       17
<PAGE>

     continuing, each LIBOR Loan shall be converted to a Base Rate Loan on the
     last day of the Interest Period applicable thereto.

          (e) Conversion Options.  The Borrower may elect to convert all or any
     part of any LIBOR Loan on the last day of the then current Interest Period
     relating thereto to a Base Rate Loan by giving advance notice to the
     Administrative Agent (which shall promptly notify the Lenders) of such
     election.  Subject to the provisions made in this Section 2.02(e), the
     Borrower may elect to convert all or any part of any Base Rate Loan at any
     time and from time to time to a LIBOR Loan by giving advance notice as
     provided in Section 2.02(c) to the Administrative Agent (which shall
     promptly notify the Lenders) of such election.  All or any part of any
     outstanding Loan may be converted as provided herein, provided that (i) any
     conversion of any Base Rate Loan into a LIBOR Loan shall be (as to each
     such Loan into which there is a conversion for an applicable Interest
     Period) in amounts of at least $3,000,000 or any whole multiple of
     $1,000,000 in excess thereof and (ii) no Default shall have occurred and be
     continuing.  If a Default shall have occurred and be continuing, no Base
     Rate Loan may be converted into a LIBOR Loan.

          (f) Advances.  Not later than 11:00 a.m. Houston, Texas time on the
     date specified for each borrowing hereunder, each Lender shall make
     available the amount of the Loan to be made by it on such date to the
     Administrative Agent, to an account which the Administrative Agent shall
     specify, in immediately available funds, for the account of the Borrower.
     The amounts so received by the Administrative Agent shall, subject to the
     terms and conditions of this Agreement, be made available to the Borrower
     by depositing the same, in immediately available funds, in an account of
     the Borrower, designated by the Borrower and maintained at the Principal
     Office.

          (g) Letters of Credit.  The Borrower shall give the Issuing Bank
     (which shall promptly notify the Lenders of such request and their
     Percentage Share of such Letter of Credit) advance notice to be received by
     the Issuing Bank not later than 11:00 a.m. Houston, Texas time not less
     than two Business Days prior thereto of each request for the issuance, and
     at least 30 Business Days prior to the date of the renewal or extension, of
     a Letter of Credit hereunder which request shall specify (i) the amount of
     such Letter of Credit, (ii) the date (which shall be a Business Day) such
     Letter of Credit is to be issued, renewed or extended, (iii) the duration
     thereof, (iv) the name and address of the beneficiary thereof, (v) the type
     of the Letter of Credit and (vi) such other information as the
     Administrative Agent may reasonably request, all of which shall be
     reasonably satisfactory to the Administrative Agent.  Subject to the terms
     and conditions of this Agreement, on the date specified for the issuance,
     renewal or extension of a Letter of Credit, the Administrative Agent shall
     issue, renew or extend such Letter of Credit to the beneficiary thereof.

          In conjunction with the issuance of each Letter of Credit, the
     Borrower and the relevant Subsidiary, if the account party, shall execute a
     Letter of Credit Agreement.  In the event of any conflict between any
     provision of a Letter of Credit Agreement and this Agreement, the Borrower,
     the Issuing Bank, the Administrative Agent and the Lenders hereby agree
     that the provisions of this Agreement shall govern.

                                       18
<PAGE>

          The Issuing Bank will send to the Borrower and each Lender,
     immediately upon issuance of any Letter of Credit, or an amendment thereto,
     a true and complete copy of such Letter of Credit, or such amendment
     thereto.

     Section 2.03 Changes of Commitments.

          (a) The Aggregate Commitments shall at all times be equal to the
     lesser of (i) the Aggregate Maximum Credit Amounts after adjustments
     resulting from reductions pursuant to Sections 2.03(b) and (c) or (ii) the
     Borrowing Base as determined from time to time.

          (b) The Borrower shall have the right to terminate or to reduce the
     amount of the Aggregate Maximum Credit Amounts at any time, or from time to
     time, upon not less than two Business Days' prior notice to the
     Administrative Agent (which shall promptly notify the Lenders) of each such
     termination or reduction, which notice shall specify the effective date
     thereof and the amount of any such reduction (which shall not be less than
     $5,000,000 or any whole multiple of $1,000,000 in excess thereof) and shall
     be irrevocable and effective only upon receipt by the Administrative Agent.

          (c) Concurrent with the issuance of the Senior Unsecured Notes, the
     Aggregate Maximum Credit Amounts shall automatically reduce to $25,000,000.

          (d) The Aggregate Maximum Credit Amounts once terminated or reduced
     may not be reinstated.

     Section 2.04  Fees.

          (a) Commitment Fee.  The Borrower shall pay to the Administrative
     Agent for the account of each Lender a commitment fee on the daily average
     unused amount of the Aggregate Commitments for the period from and
     including the Closing Date up to, but excluding, the earlier of the date
     the Aggregate Commitments are terminated or the Termination Date at a rate
     per annum equal to 1/2 of 1%.  Accrued commitment fees shall be payable
     quarterly in arrears on each Quarterly Date and on the earlier of the date
     the Aggregate Commitments are terminated or the Termination Date.

          (b)  Letter of Credit Fees.

               (i) The Borrower agrees to pay the Administrative Agent, for the
     account of each Lender, commissions for issuing the Letters of Credit on
     the daily average outstanding amount of the maximum liability of the
     Issuing Bank existing from time to time under such Letter of Credit
     (calculated separately for each Letter of Credit) at the rate per annum
     equal to the Applicable Margin in effect from time to time for LIBOR Loans,
     provided that each Letter of Credit shall bear a minimum commission of
     $1,000.00.  Each Letter of Credit shall be deemed to be outstanding up to
     the full face amount of such Letter of Credit until the Issuing Bank has
     received the canceled Letter of Credit or a written cancellation of the
     Letter of Credit from the beneficiary of such Letter of Credit in form and
     substance acceptable to the Issuing Bank or, for any reductions in the
     amount of the Letter of Credit (other than from a drawing), written
     notification from

                                       19
<PAGE>

     the beneficiary of such Letter of Credit. Such commissions are payable
     quarterly in arrears on each Quarterly Date and upon cancellation or
     expiration of each such Letter of Credit.

               (ii) The Borrower agrees to pay the Administrative Agent, for the
     account of the Issuing Bank, commissions for issuing the Letters of Credit
     (calculated separately for each Letter of Credit) equal to the greater of
     (x) 0.25% of the face amount of each Letter of Credit and (y) $1000,
     payable upon issuance of such Letter of Credit.

               (iii)  The Borrower shall pay to the Issuing Bank such other
     usual and customary fees associated with any transfers, amendments,
     drawings, negotiations or reissuances of any Letters of Credit.

          (c) Other Fees.  The Borrower shall pay such other fees as are set
     forth in the Fee Letter pursuant to the provisions thereof and on the dates
     specified therein.

     Section 2.05 Several Obligations. The failure of any Lender to make any
Loan to be made by it or to provide funds for disbursements or reimbursements
under Letters of Credit on the date specified therefor shall not relieve any
other Lender of its obligation to make its Loan or provide funds on such date,
but no Lender shall be responsible for the failure of any other Lender to make a
Loan to be made by such other Lender or to provide funds to be provided by such
other Lender.

     Section 2.06  Notes.  The Loans made by each Lender shall be evidenced by a
single promissory note of the Borrower in substantially the form of Exhibit A,
dated (i) the Closing Date or (ii) the effective date of an Assignment pursuant
to Section 12.06(b), payable to the order of such Lender in a principal face
amount equal to its Maximum Credit Amount as originally in effect and otherwise
duly completed and such substitute Notes as required by Section 12.06(b).  The
date, amount, Type, interest rate and Interest Period of each Loan made by each
Lender, and all payments made on account of the principal thereof, shall be
recorded by such Lender on its books for its Note, and, prior to any transfer
may be endorsed by such Lender on the schedule attached to such Note or any
continuation thereof or on any separate record maintained by such Lender.
Failure to make any such notation or to attach a schedule shall not affect any
Lender's or the Borrower's rights or obligations in respect of such Loans or
affect the validity of such transfer by any Lender of its Note.

                                       20
<PAGE>

     Section 2.07  Prepayments.

          (a) Voluntary Prepayments.  The Borrower may prepay the Base Rate
     Loans upon not less than one Business Day's prior notice to the
     Administrative Agent (which shall promptly notify the Lenders), which
     notice shall specify the prepayment date (which shall be a Business Day)
     and the amount of the prepayment (which shall be at least $1,000,000 or the
     remaining aggregate principal balance outstanding on the Notes) and shall
     be irrevocable and effective only upon receipt by the Administrative Agent,
     provided that interest on the principal prepaid, accrued to the prepayment
     date, shall be paid on the prepayment date.  The Borrower may prepay LIBOR
     Loans on the same conditions as for Base Rate Loans (except that prior
     notice to the Administrative Agent shall be not less than three Business
     Days for LIBOR Loans) and in addition such prepayments of LIBOR Loans shall
     be subject to the terms of Section 5.05 and shall be in an amount equal to
     all of the LIBOR Loans for the Interest Period prepaid.

          (b)  Mandatory Prepayments.

               (i) Termination or Reduction of Aggregate Maximum Credit Amounts.
     If, after giving effect to any termination or reduction of the Aggregate
     Maximum Credit Amounts pursuant to Section 2.03(b), the outstanding
     aggregate principal amount of the Loans plus the LC Exposure exceeds the
     Aggregate Maximum Credit Amounts, the Borrower shall (i) prepay the Loans
     on the date of such termination or reduction in an aggregate principal
     amount equal to the excess, together with interest on the principal amount
     paid accrued to the date of such prepayment and (ii) if any excess remains
     after prepaying all of the Loans because of LC Exposure, pay to the
     Administrative Agent on behalf of the Lenders an amount equal to the excess
     to be held as cash collateral as provided in Section 2.10(b) hereof.

               (ii) Redetermination of Borrowing Base.  Upon any redetermination
     of the amount of the Borrowing Base in accordance with Section 2.08, if the
     redetermined Borrowing Base results in a Borrowing Base Deficiency, then
     the Borrower shall within 30 days after written notice thereof (i) prepay
     the Loans in an aggregate principal amount sufficient to eliminate such
     Borrowing Base Deficiency, together with interest on the principal amount
     paid accrued to the date of each such prepayment, (ii) grant to the
     Administrative Agent a first priority Lien in additional Properties of the
     Borrower, which in the Lenders' sole determination, have sufficient value
     to eliminate such Borrowing Base Deficiency, or (iii) eliminate such
     Borrowing Base Deficiency, through a combination of the actions described
     in clauses (i) and (ii).  If, because of LC Exposure, a Borrowing Base
     Deficiency remains after prepaying all of the Loans and granting first
     priority Liens in additional Properties to the Administrative Agent, the
     Borrower shall pay to the Administrative Agent on behalf of the Lenders an
     amount equal to such remaining Borrowing Base Deficiency to be held as cash
     collateral as provided in Section 2.10(b).

               (iii)  Monthly Reduction Amount.  If any reduction of the amount
     of the Borrowing Base by operation of the Monthly Reduction Amount in
     accordance with Section 2.08 results in a Borrowing Base Deficiency, then
     the Borrower shall immediately upon receipt of written notice thereof
     prepay the Loans in an aggregate

                                       21
<PAGE>

     principal amount equal to such Borrowing Base Deficiency, together with
     interest on the principal amount paid accrued to the date of such
     prepayment. If, because of LC Exposure, a Borrowing Base Deficiency remains
     after prepaying all of the Loans, the Borrower shall pay to the
     Administrative Agent on behalf of the Lenders an amount equal to such
     remaining Borrowing Base Deficiency to be held as cash collateral as
     provided in Section 2.10(b).

               (iv) Issuance of Senior Unsecured Notes.  Proceeds received by
     the Borrower from the issuance of the Senior Unsecured Notes shall, no
     later than three Business Days after receipt thereof by the Borrower, be
     used, to the extent necessary, to prepay the aggregate principal amount of
     all Loans then outstanding, together with interest on the principal amount
     paid accrued to the date of such prepayment.

          (c) Generally.  Prepayments permitted or required under this Section
     2.07 shall be without premium or penalty, except as required under Section
     5.05 for prepayment of LIBOR Loans.  Any prepayment may be reborrowed
     subject to the then effective Aggregate Commitments.

     Section 2.08  Borrowing Base and Monthly Reduction Amount.

          (a) Generally.  The Borrowing Base and the Monthly Reduction Amount
     shall be determined in accordance with Section 2.08(b) by the
     Administrative Agent with the concurrence of the Lenders and is subject to
     redetermination in accordance with Section 2.08(d).  Upon any
     redetermination of the Borrowing Base or the Monthly Reduction Amount, such
     redetermination shall remain in effect until the next successive
     Redetermination Date.  So long as any of the Commitments are in effect or
     any LC Exposure or Loans are outstanding hereunder, this facility shall be
     governed by the then effective Borrowing Base and Monthly Reduction Amount.
     During the period from and after the Closing Date until the first
     redetermination pursuant to Section 2.08(d) or adjusted pursuant to Section
     8.08(c), the amount of the Borrowing Base shall be $65,000,000 and the
     Monthly Reduction Amount shall be $5,000,000.00; provided, however, if the
     Aquila Buy-Back and Closing Hedging Agreements are not completed prior to
     or on the Closing Date, the initial Borrowing Base shall be $60,000,000.
     No delay for any reason whatsoever in a redetermination of the Monthly
     Reduction Amount shall affect the Borrower's obligations under Section
     2.07(b)(iii).

          (b) Redetermination Procedure.  Upon receipt of the reports required
     by Section 8.07 and such other reports, data and supplemental information
     as may from time to time be reasonably requested by the Administrative
     Agent (the "Engineering Reports"), the Administrative Agent will
     redetermine the Borrowing Base and the Monthly Reduction Amount.  Such
     redetermination will be in accordance with its normal and customary
     procedures for evaluating oil and gas reserves and other related assets as
     such exist at that particular time.   The Administrative Agent, in its sole
     discretion, may make adjustments to the rates, volumes and prices and other
     assumptions set forth therein in accordance with its normal and customary
     procedures for evaluating oil and gas reserves and other related assets as
     such exist at that particular time.  The Administrative Agent shall propose
     to the Lenders a new Borrowing Base and Monthly Reduction Amount within 15
     days following receipt by the Administrative Agent and the Lenders of

                                       22
<PAGE>

     the Engineering Reports in a timely and complete manner. After having
     received notice of such proposal by the Administrative Agent, the Lenders
     shall have 15 days to agree or disagree with such proposal. If at the end
     of the 15 days, the Lenders have not communicated their approval or
     disapproval, such silence shall be deemed to be an approval and the
     Administrative Agent's proposal shall be the new Borrowing Base and Monthly
     Reduction Amount. If however, the Lenders notify the Administrative Agent
     within 15 days of their disapproval, the Lenders shall, within a reasonable
     period of time, agree on a new Borrowing Base and Monthly Reduction Amount.
     The Administrative Agent and all of the Lenders must approve a new
     Borrowing Base and Monthly Reduction Amount.

          (c) Exclusions.  The Administrative Agent may exclude any Oil and Gas
     Property or portion of production therefrom or any income from any other
     Property from the Borrowing Base, at any time, because title information is
     not reasonably satisfactory, such Property is not Mortgaged Property or
     such Property is not assignable.

          (d) Redetermination Dates.  So long as any of the Commitments are in
     effect and until payment in full of all Loans hereunder, on or around the
     first Business Day of each April and October (each being a "Scheduled
     Redetermination Date"), the Lenders shall redetermine the amount of the
     Borrowing Base and the Monthly Reduction Amount in accordance with Section
     2.08(b); provided, however, an interim redetermination of the Borrowing
     Base shall occur on or around July 31, 2001, which date shall be deemed a
     "Scheduled Redetermination Date".  In addition, (i) the Borrower may
     initiate a redetermination of the Borrowing Base and the Monthly Reduction
     Amount at any other time as it so elects by specifying in writing to the
     Administrative Agent (who will promptly notify the Lenders) the date by
     which the Borrower will furnish to the Administrative Agent and the Lenders
     a Reserve Report in accordance with Section 8.07(b) and the date by which
     such redetermination is requested to occur; provided, however, that the
     Borrower may initiate only one such unscheduled redetermination per
     calendar year and (ii) the Administrative Agent may initiate a
     redetermination of the Borrowing Base and the Monthly Reduction Amount at
     any other time as it so elects by specifying in writing to the Borrower the
     date by which the Borrower is to furnish a Reserve Report in accordance
     with Section 8.07(b) and the date on which such redetermination is to
     occur; provided, however, that the Administrative Agent may initiate  only
     one such unscheduled redetermination between each Scheduled Redetermination
     Date.  Concurrently with the delivery of each Reserve Report delivered in
     connection with each unscheduled Borrowing Base redetermination requested
     by the Borrower, the Borrower shall pay an engineering fee to the
     Administrative Agent, for its own account, of $10,000.

          (e) Effective Date.  The Administrative Agent shall promptly notify in
     writing the Borrower and the Lenders of the new Borrowing Base and Monthly
     Reduction Amount.  Any redetermination of the Borrowing Base and the
     Monthly Reduction Amount shall not be in effect until written notice is
     received by the Borrower.

          (f) Redetermination Upon Issuance of Senior Unsecured Notes.  The
     Borrowing Base and the Monthly Reduction Amount may be redetermined by the
     Administrative Agent and the Lenders, in accordance with their respective
     normal and

                                       23
<PAGE>

     customary procedures for evaluating oil and gas reserves and other related
     assets as such exist at that particular time, promptly after the date of
     issuance of the Senior Unsecured Debt and such redetermination shall become
     effective in accordance with the procedures in Section 2.08(f). The
     foregoing redetermination of the Borrowing Base is in addition to any other
     unscheduled redetermination allowed pursuant to Section 2.08(d).
     Notwithstanding anything herein to the contrary, from and after the
     effective date of such redetermination until the next redetermination
     thereafter pursuant to Section 2.08(d), the Borrowing Base shall not exceed
     $20,000,000.

     Section 2.09 Assumption of Risks. The Borrower assumes all risks of the
acts or omissions of any beneficiary of any Letter of Credit or any transferee
thereof with respect to its use of such Letter of Credit. Neither the Issuing
Bank (except in the case of gross negligence or willful misconduct on the part
of the Issuing Bank or any of its employees), its correspondents nor any Lender
shall be responsible for the validity, sufficiency or genuineness of
certificates or other documents or any endorsements thereon, even if such
certificates or other documents should in fact prove to be invalid,
insufficient, fraudulent or forged; for errors, omissions, interruptions or
delays in transmissions or delivery of any messages by mail, telex, or
otherwise, whether or not they be in code; for errors in translation or for
errors in interpretation of technical terms; the validity or sufficiency of any
instrument transferring or assigning or purporting to transfer or assign any
Letter of Credit or the rights or benefits thereunder or proceeds thereof, in
whole or in part, which may prove to be invalid or ineffective for any reason;
the failure of any beneficiary or any transferee of any Letter of Credit to
comply fully with conditions required in order to draw upon any Letter of
Credit; or for any other consequences arising from causes beyond the Issuing
Bank's control or the control of the Issuing Bank's correspondents unless, as to
any of the foregoing, constituting gross negligence or willful misconduct on the
part of the Administrative Agent or any Lender. In addition, neither the Issuing
Bank, the Administrative Agent nor any Lender shall be responsible for any
error, neglect, or default of any of the Issuing Bank's correspondents; and none
of the above shall affect, impair or prevent the vesting of any of the Issuing
Bank's, the Administrative Agent's or any Lender's rights or powers hereunder or
under the Letter of Credit Agreements, all of which rights shall be cumulative,
unless, as to any of the foregoing, constituting gross negligence or willful
misconduct on the part of the Administrative Agent or any Lender. The Issuing
Bank and its correspondents may accept certificates or other documents that
appear on their face to be in order, without responsibility for further
investigation of any matter contained therein regardless of any notice or
information to the contrary. In furtherance and not in limitation of the
foregoing provisions, the Borrower agrees that any action, inaction or omission
taken or not taken by the Issuing Bank or by any correspondent for the Issuing
Bank in good faith in connection with any Letter of Credit, or any related
drafts, certificates, documents or instruments, shall be binding on the Borrower
and shall not put the Issuing Bank or its correspondents under any resulting
liability to the Borrower.

     Section 2.10  Obligation to Reimburse and to Prepay.

          (a) If a disbursement by the Issuing Bank is made under any Letter of
     Credit, the Borrower shall pay to the Administrative Agent within two (2)
     Business Days after notice of any such disbursement is received by the
     Borrower, the amount of each such disbursement made by the Issuing Bank
     under the Letter of Credit (if such payment is not sooner effected as may
     be required under this Section 2.10 or under other provisions of

                                       24
<PAGE>

     the Letter of Credit), together with interest on the amount disbursed from
     and including the date of disbursement until payment in full of such
     disbursed amount at a varying rate per annum equal to (i) the then
     applicable interest rate for Base Rate Loans through the second Business
     Day after notice of such disbursement is received by the Borrower and (ii)
     thereafter, the Post-Default Rate for Base Rate Loans (but in no event to
     exceed the Highest Lawful Rate) for the period from and including the third
     Business Day following the date of such disbursement to and including the
     date of repayment in full of such disbursed amount. The obligations of the
     Borrower under this Agreement with respect to each Letter of Credit shall
     be absolute, unconditional and irrevocable and shall be paid or performed
     strictly in accordance with the terms of this Agreement under all
     circumstances whatsoever, including, without limitation, but only to the
     fullest extent permitted by applicable law, the following circumstances:
     (i) any lack of validity or enforceability of this Agreement, any Letter of
     Credit or any of the Security Instruments; (ii) any amendment or waiver of
     (including any default), or any consent to departure from this Agreement
     (except to the extent permitted by any amendment or waiver), any Letter of
     Credit or any of the Security Instruments; (iii) the existence of any
     claim, set-off, defense or other rights which the Borrower may have at any
     time against the beneficiary of any Letter of Credit or any transferee of
     any Letter of Credit (or any Persons for whom any such beneficiary or any
     such transferee may be acting), the Issuing Bank, the Administrative Agent,
     any Lender or any other Person, whether in connection with this Agreement,
     any Letter of Credit, the Security Instruments, the transactions
     contemplated hereby or any unrelated transaction; (iv) any statement,
     certificate, draft, notice or any other document presented under any Letter
     of Credit proves to have been forged, fraudulent, insufficient or invalid
     in any respect or any statement therein proves to have been untrue or
     inaccurate in any respect whatsoever; (v) payment by the Issuing Bank under
     any Letter of Credit against presentation of a draft or certificate which
     appears on its face to comply, but does not comply, with the terms of such
     Letter of Credit; and (vi) any other circumstance or happening whatsoever,
     whether or not similar to any of the foregoing.

     Notwithstanding anything in this Agreement to the contrary, the Borrower
     will not be liable for payment or performance that results from the gross
     negligence or willful misconduct of the Issuing Bank, except (i) where the
     Borrower or any Subsidiary actually recovers the proceeds for itself or the
     Issuing Bank of any payment made by the Issuing Bank in connection with
     such gross negligence or willful misconduct or (ii) in cases where the
     Administrative Agent makes payment to the named beneficiary of a Letter of
     Credit.

          (b) In the event of the occurrence of any Event of Default, a payment
     or prepayment pursuant to Section 2.07(b) or the maturity of the Notes,
     whether by acceleration or otherwise, an amount equal to the LC Exposure
     (or the excess in the case of Section 2.07(b)) shall be deemed to be
     forthwith due and owing by the Borrower to the Issuing Bank, the
     Administrative Agent and the Lenders as of the date of any such occurrence;
     and the Borrower's obligation to pay such amount shall be absolute and
     unconditional, without regard to whether any beneficiary of any such Letter
     of Credit has attempted to draw down all or a portion of such amount under
     the terms of a Letter of Credit, and, to the fullest extent permitted by
     applicable law, shall not be subject to any

                                       25
<PAGE>

     defense or be affected by a right of set-off, counterclaim or recoupment
     which the Borrower may now or hereafter have against any such beneficiary,
     the Issuing Bank, the Administrative Agent, the Lenders or any other Person
     for any reason whatsoever. Such payments shall be held by the Issuing Bank
     on behalf of the Lenders as cash collateral securing the LC Exposure in an
     account or accounts at the Principal Office; and the Borrower hereby grants
     to and by its deposit with the Administrative Agent grants to the
     Administrative Agent a security interest in such cash collateral. In the
     event of any such payment by the Borrower of amounts contingently owing
     under outstanding Letters of Credit and in the event that thereafter drafts
     or other demands for payment complying with the terms of such Letters of
     Credit are not made prior to the respective expiration dates thereof, the
     Administrative Agent agrees, if no Event of Default has occurred and is
     continuing or if no other amounts are outstanding under this Agreement, the
     Notes or the Security Instruments, to remit to the Borrower amounts for
     which the contingent obligations evidenced by the Letters of Credit have
     ceased.

          (c) Each Lender severally and unconditionally agrees that it shall
     promptly reimburse the Issuing Bank an amount equal to such Lender's
     Percentage Share of any disbursement made by the Issuing Bank under any
     Letter of Credit that is not reimbursed according to this Section 2.10.

     Section 2.11 Lending Offices. The Loans of each Type made by each Lender
shall be made and maintained at such Lender's Applicable Lending Office for
Loans of such Type.

                                  ARTICLE III

                       PAYMENTS OF PRINCIPAL AND INTEREST

     Section 3.01  Repayment of Loans.

          (a) Loans.  On the Termination Date the Borrower shall repay the
     outstanding aggregate principal amount of the Notes.

          (b) Generally.  The Borrower will pay to the Administrative Agent, for
     the account of each Lender, the principal payments required by this Section
     3.01.

     Section 3.02  Interest.

          (a) Interest Rates.  The Borrower will pay to the Administrative
     Agent, for the account of each Lender, interest on the unpaid principal
     amount of each Loan made by such Lender for the period commencing on the
     date such Loan is made to, but excluding, the date such Loan shall be paid
     in full, at the following rates per annum:

               (i) if such a Loan is a Base Rate Loan, the Base Rate (as in
     effect from time to time) plus the Applicable Margin, but in no event to
     exceed the Highest Lawful Rate; and

                                       26
<PAGE>

               (ii) if such a Loan is a LIBOR Loan, for each Interest Period
     relating thereto, the LIBOR Rate for such Loan plus the Applicable Margin
     (as in effect from time to time), but in no event to exceed the Highest
     Lawful Rate.

          (b) Post-Default Rate.  Notwithstanding the foregoing, the Borrower
     will pay to the Administrative Agent, for the account of each Lender,
     interest at the applicable Post-Default Rate on any principal of any Loan
     made by such Lender, and (to the fullest extent permitted by law) on any
     other amount payable by the Borrower hereunder, under any Loan Document or
     under any Note held by such Lender to or for the account of such Lender,
     for the period commencing on the date of an Event of Default until the same
     is paid in full or all Events of Default are cured or waived.

          (c) Due Dates.  Accrued interest on Base Rate Loans shall be payable
     on each Quarterly Date commencing on June 30, 2001, and accrued interest on
     each LIBOR Loan shall be payable on the last day of the Interest Period
     therefor and, if such Interest Period is longer than three months, at
     three-month intervals following the first day of such Interest Period,
     except that interest payable at the Post-Default Rate shall be payable from
     time to time on demand and interest on any LIBOR Loan that is converted
     into a Base Rate Loan (pursuant to Section 5.04) shall be payable on the
     date of conversion (but only to the extent so converted).  Any accrued and
     unpaid interest on the Loans on the Termination Date shall be paid on such
     date.

          (d) Determination of Rates.  Promptly after the determination of any
     interest rate provided for herein or any change therein, the Administrative
     Agent shall notify the Lenders to which such interest is payable and the
     Borrower thereof.  Each determination by the Administrative Agent of an
     interest rate or fee hereunder shall, except in cases of manifest error, be
     final, conclusive and binding on the parties.

                                  ARTICLE IV

                PAYMENTS; PRO RATA TREATMENT; COMPUTATIONS; ETC.

     Section 4.01 Payments. Except to the extent otherwise provided herein, all
payments of principal, interest and other amounts to be made by the Borrower or
any Subsidiary under this Agreement, the Notes and the Letter of Credit
Agreements shall be made in Dollars, in immediately available funds, to the
Administrative Agent at such account as the Administrative Agent shall specify
by notice to the Borrower from time to time, not later than 11:00 a.m. Houston,
Texas time on the date on which such payments shall become due (each such
payment made after such time on such due date to be deemed to have been made on
the next succeeding Business Day). Such payments shall be made without (to the
fullest extent permitted by applicable law) defense, set-off or counterclaim.
Each payment received by the Administrative Agent under this Agreement or any
Note for account of a Lender shall be paid promptly to such Lender in
immediately available funds. Except as otherwise provided in the definition of
"Interest Period", if the due date of any payment under this Agreement or any
Note would otherwise fall on a day which is not a Business Day such date shall
be extended to the next succeeding Business Day and interest shall be payable
for any principal so extended for the period of such extension.  At the time of
each payment to the Administrative Agent of any

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<PAGE>

principal of or interest on any borrowing, the Borrower shall notify the
Administrative Agent of the Loans to which such payment shall apply. In the
absence of such notice the Administrative Agent may specify the Loans to which
such payment shall apply, but to the extent possible such payment or prepayment
will be applied first to the Loans comprised of Base Rate Loans.

     Section 4.02  Pro Rata Treatment.  Except to the extent otherwise provided
herein each Lender agrees that:  (i) each borrowing from the Lenders under
Section 2.01 and each continuation and conversion under Section 2.02 shall be
made from the Lenders pro rata in accordance with their Percentage Share, each
payment of fees under Section 2.04(a) shall be made for account of the Lenders
pro rata in accordance with their Percentage Share, and each termination or
reduction of the amount of the Aggregate Maximum Credit Amounts under Section
2.03(b) shall be applied to the Commitment of each Lender, pro rata according to
the amounts of its respective Commitment; (ii) each payment of principal of
Loans by the Borrower shall be made for account of the Lenders pro rata in
accordance with the respective unpaid principal amount of the Loans held by the
Lenders; and (iii) each payment of interest on Loans by the Borrower shall be
made for account of the Lenders pro rata in accordance with the amounts of
interest due and payable to the respective Lenders; and (iv) each reimbursement
by the Borrower of disbursements under Letters of Credit shall be made for
account of the Issuing Bank or, if funded by the Lenders, pro rata for the
account of the Lenders, in accordance with the amounts of reimbursement
obligations due and payable to each respective Lender.

     Section 4.03 Computations. Interest on LIBOR Loans and fees shall be
computed on the basis of a year of 360 days and actual days elapsed (including
the first day but excluding the last day) occurring in the period for which such
interest is payable, unless such calculation would exceed the Highest Lawful
Rate, in which case interest shall be calculated on the per annum basis of a
year of 365 or 366 days, as the case may be. Interest on Base Rate Loans shall
be computed on the basis of a year of 365 or 366 days, as the case may be, and
actual days elapsed (including the first day but excluding the last day)
occurring in the period for which such interest is payable.

     Section 4.04  Non-receipt of Funds by the Administrative Agent.  Unless the
Administrative Agent shall have been notified by a Lender or the Borrower prior
to the date on which such notifying party is scheduled to make payment to the
Administrative Agent (in the case of a Lender) of the proceeds of a Loan or a
payment under a Letter of Credit to be made by it hereunder or (in the case of
the Borrower) a payment to the Administrative Agent for account of one or more
of the Lenders hereunder (such payment being herein called the "Required
Payment"), which notice shall be effective upon receipt, that it does not intend
to make the Required Payment to the Administrative Agent, the Administrative
Agent may assume that the Required Payment has been made and may, in reliance
upon such assumption (but shall not be required to), make the amount thereof
available to the intended recipient(s) on such date and, if such Lender or the
Borrower (as the case may be) has not in fact made the Required Payment to the
Administrative Agent, the recipient(s) of such payment shall, on demand, repay
to the Administrative Agent the amount so made available together with interest
thereon in respect of each day during the period commencing on the date such
amount was so made available by the Administrative Agent until, but excluding,
the date the Administrative Agent recovers such amount at a rate per annum
which, for any Lender as recipient, will be equal to the Federal Funds

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<PAGE>

Rate, and for the Borrower as recipient, will be equal to the Base Rate plus the
Applicable Margin.

     Section 4.05  Set-off, Sharing of Payments, Etc.

          (a) The Borrower agrees that, in addition to (and without limitation
     of) any right of set-off, bankers' lien or counterclaim a Lender may
     otherwise have, each Lender shall have the right and be entitled (after
     consultation with the Administrative Agent), at its option, to offset
     balances held by it or by any of its Affiliates for account of the Borrower
     at any of its offices, in Dollars or in any other currency, against any
     principal of or interest on any of such Lender's Loans, or any other amount
     payable to such Lender hereunder, which is not paid when due (regardless of
     whether such balances are then due to the Borrower), in which case it shall
     promptly notify the Borrower and the Administrative Agent thereof, provided
     that such Lender's failure to give such notice shall not affect the
     validity thereof.

          (b) If any Lender shall obtain payment of any principal of or interest
     on any Loan made by it to the Borrower under this Agreement (or
     reimbursement as to any Letter of Credit) through the exercise of any right
     of set-off, banker's lien or counterclaim or similar right or otherwise,
     and, as a result of such payment, such Lender shall have received a greater
     percentage of the principal or interest (or reimbursement) then due
     hereunder by the Borrower to such Lender than the percentage received by
     any other Lenders, it shall promptly (i) notify the Administrative Agent
     and each other Lender thereof and (ii) purchase from such other Lenders
     participations in (or, if and to the extent specified by such Lender,
     direct interests in) the Loans (or participations in Letters of Credit)
     made by such other Lenders (or in interest due thereon, as the case may be)
     in such amounts, and make such other adjustments from time to time as shall
     be equitable, to the end that all the Lenders shall share the benefit of
     such excess payment (net of any expenses which may be incurred by such
     Lender in obtaining or preserving such excess payment) pro rata in
     accordance with the unpaid principal and/or interest on the Loans held by
     each of the Lenders (or reimbursements of Letters of Credit).  To such end
     all the Lenders shall make appropriate adjustments among themselves (by the
     resale of participations sold or otherwise) if such payment is rescinded or
     must otherwise be restored.  The Borrower agrees that any Lender so
     purchasing a participation (or direct interest) in the Loans made by other
     Lenders (or in interest due thereon, as the case may be) may exercise all
     rights of set-off, banker's lien, counterclaim or similar rights with
     respect to such participation as fully as if such Lender were a direct
     holder of Loans (or Letters of Credit) in the amount of such participation.
     Nothing contained herein shall require any Lender to exercise any such
     right or shall affect the right of any Lender to exercise, and retain the
     benefits of exercising, any such right with respect to any other
     indebtedness or obligation of the Borrower.  If under any applicable
     bankruptcy, insolvency or other similar law, any Lender receives a secured
     claim in lieu of a set-off to which this Section 4.05 applies, such Lender
     shall, to the extent practicable, exercise its rights in respect of such
     secured claim in a manner consistent with the rights of the Lenders
     entitled under this Section 4.05 to share the benefits of any recovery on
     such secured claim.

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<PAGE>

     Section 4.06  Taxes.

          (a) Payments Free and Clear.  Any and all payments by the Borrower
     hereunder shall be made, in accordance with Section 4.01, free and clear of
     and without deduction for any and all present or future taxes, levies,
     imposts, deductions, charges or withholdings, and all liabilities with
     respect thereto, excluding, in the case of each Lender, the Issuing Bank
     and the Administrative Agent, taxes imposed on its income, and franchise or
     similar taxes imposed on it, by (i) any jurisdiction (or political
     subdivision thereof) of which the Administrative Agent, the Issuing Bank or
     such Lender, as the case may be, is a citizen or resident or in which such
     Lender has an Applicable Lending Office, (ii) the jurisdiction (or any
     political subdivision thereof) in which the Administrative Agent, the
     Issuing Bank or such Lender is organized, or (iii) any jurisdiction (or
     political subdivision thereof) in which such Lender, the Issuing Bank or
     the Administrative Agent is presently doing business which taxes are
     imposed solely as a result of doing business in such jurisdiction (all such
     non-excluded taxes, levies, imposts, deductions, charges, withholdings and
     liabilities being hereinafter referred to as "Taxes").  If the Borrower
     shall be required by law to deduct any Taxes from or in respect of any sum
     payable hereunder to the Lenders, the Issuing Bank or the Administrative
     Agent (i) the sum payable shall be increased by the amount necessary so
     that after making all required deductions (including deductions applicable
     to additional sums payable under this Section 4.06) such Lender, the
     Issuing Bank or the Administrative Agent (as the case may be) shall receive
     an amount equal to the sum it would have received had no such deductions
     been made, (ii) the Borrower shall make such deductions and (iii) the
     Borrower shall pay the full amount deducted to the relevant taxing
     authority or other Governmental Authority in accordance with applicable
     law.

          (b) Other Taxes.  In addition, to the fullest extent permitted by
     applicable law, the Borrower agrees to pay any present or future stamp or
     documentary taxes or any other excise or property taxes, charges or similar
     levies that arise from any payment made hereunder or from the execution,
     delivery or registration of, or otherwise with respect to, this Agreement,
     any Assignment or any Security Instrument (hereinafter referred to as
     "Other Taxes").

          (C) INDEMNIFICATION.  TO THE FULLEST EXTENT PERMITTED BY APPLICABLE
     LAW, THE BORROWER WILL INDEMNIFY EACH LENDER AND THE ISSUING BANK AND THE
     ADMINISTRATIVE AGENT FOR THE FULL AMOUNT OF TAXES AND OTHER TAXES
     (INCLUDING, BUT NOT LIMITED TO, ANY TAXES OR OTHER TAXES IMPOSED BY ANY
     GOVERNMENTAL AUTHORITY ON AMOUNTS PAYABLE UNDER THIS SECTION 4.06) PAID BY
     SUCH LENDER, THE ISSUING BANK OR THE ADMINISTRATIVE AGENT (ON THEIR BEHALF
     OR ON BEHALF OF ANY LENDER), AS THE CASE MAY BE, AND ANY LIABILITY
     (INCLUDING PENALTIES, INTEREST AND EXPENSES) ARISING THEREFROM OR WITH
     RESPECT THERETO, WHETHER OR NOT SUCH TAXES OR OTHER TAXES WERE CORRECTLY OR
     LEGALLY ASSERTED UNLESS THE PAYMENT OF SUCH TAXES WAS NOT CORRECTLY OR
     LEGALLY ASSERTED AND SUCH LENDER'S PAYMENT OF SUCH TAXES OR OTHER TAXES WAS
     THE RESULT OF ITS GROSS NEGLIGENCE OR WILLFUL MISCONDUCT.  ANY PAYMENT
     PURSUANT TO SUCH INDEMNIFICATION SHALL BE MADE WITHIN 30 DAYS AFTER THE
     DATE ANY LENDER, THE ISSUING BANK OR THE ADMINISTRATIVE AGENT,

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<PAGE>

     AS THE CASE MAY BE, MAKES WRITTEN DEMAND THEREFOR. IF ANY LENDER, THE
     ISSUING BANK OR THE ADMINISTRATIVE AGENT RECEIVES A REFUND OR CREDIT IN
     RESPECT OF ANY TAXES OR OTHER TAXES FOR WHICH SUCH LENDER, ISSUING BANK OR
     THE ADMINISTRATIVE AGENT HAS RECEIVED PAYMENT FROM THE BORROWER IT SHALL
     PROMPTLY NOTIFY THE BORROWER OF SUCH REFUND OR CREDIT AND SHALL, IF NO
     DEFAULT HAS OCCURRED AND IS CONTINUING, WITHIN 30 DAYS AFTER RECEIPT OF A
     REQUEST BY THE BORROWER (OR PROMPTLY UPON RECEIPT, IF THE BORROWER HAS
     REQUESTED APPLICATION FOR SUCH REFUND OR CREDIT PURSUANT HERETO), PAY AN
     AMOUNT EQUAL TO SUCH REFUND OR CREDIT TO THE BORROWER WITHOUT INTEREST (BUT
     WITH ANY INTEREST SO REFUNDED OR CREDITED), PROVIDED THAT THE BORROWER,
     UPON THE REQUEST OF SUCH LENDER, THE ISSUING BANK OR THE ADMINISTRATIVE
     AGENT, AGREES TO RETURN SUCH REFUND OR CREDIT (PLUS PENALTIES, INTEREST OR
     OTHER CHARGES) TO SUCH LENDER OR THE ADMINISTRATIVE AGENT IN THE EVENT SUCH
     LENDER OR THE ADMINISTRATIVE AGENT IS REQUIRED TO REPAY SUCH REFUND OR
     CREDIT.

          (d)  Lender Representations.

               (i) Each Lender represents that it is either (1) a banking
     association or corporation organized under the laws of the United States of
     America or any state thereof or (2) it is entitled to complete exemption
     from United States withholding tax imposed on or with respect to any
     payments, including fees, to be made to it pursuant to this Agreement (A)
     under an applicable provision of a tax convention to which the United
     States of America is a party or (B) because it is acting through a branch,
     agency or office in the United States of America and any payment to be
     received by it hereunder is effectively connected with a trade or business
     in the United States of America.  Each Lender that is not a banking
     association or corporation organized under the laws of the United States of
     America or any state thereof agrees to provide to the Borrower and the
     Administrative Agent on the Closing Date, or on the date of its delivery of
     the Assignment pursuant to which it becomes a Lender, and at such other
     times as required by United States law or as the Borrower or the
     Administrative Agent shall reasonably request, two accurate and complete
     original signed copies of either (A) Internal Revenue Service Form W-8ECI
     (or successor form) certifying that all payments to be made to it hereunder
     will be effectively connected to a United States trade or business (the
     "Form W-8ECI Certification") or (B) Internal Revenue Service Form W-8BEN
     (or successor form) certifying that it is entitled to the benefit of a
     provision of a tax convention to which the United States of America is a
     party which completely exempts from United States withholding tax all
     payments to be made to it hereunder (the "Form W-8BEN Certification").  In
     addition, each Lender agrees that if it previously filed a Form W-8ECI
     Certification, it will deliver to the Borrower and the Administrative Agent
     a new Form W-8ECI Certification prior to the first payment date occurring
     in each of its subsequent taxable years; and if it previously filed a Form
     W-8BEN Certification, it will deliver to the Borrower and the
     Administrative Agent a new certification prior to the first payment date
     falling in the third year following the previous filing of such
     certification.  Each Lender also agrees to deliver to the Borrower and the
     Administrative Agent such other or supplemental forms as may at any time be
     required as a result of changes in applicable law or regulation in order to
     confirm or maintain in effect its entitlement to exemption

                                       31
<PAGE>

     from United States withholding tax on any payments hereunder, provided that
     the circumstances of such Lender at the relevant time and applicable laws
     permit it to do so. If a Lender determines, as a result of any change in
     either (i) a Governmental Requirement or (ii) its circumstances, that it is
     unable to submit any form or certificate that it is obligated to submit
     pursuant to this Section 4.06, or that it is required to withdraw or cancel
     any such form or certificate previously submitted, it shall promptly notify
     the Borrower and the Administrative Agent of such fact. If a Lender is
     organized under the laws of a jurisdiction outside the United States of
     America, unless the Borrower and the Administrative Agent have received a
     Form W-8BEN Certification or Form W-8ECI Certification satisfactory to them
     indicating that all payments to be made to such Lender hereunder are not
     subject to United States withholding tax, the Borrower shall withhold taxes
     from such payments at the applicable statutory rate. Each Lender agrees to
     indemnify and hold harmless the Borrower or Administrative Agent, as
     applicable, from any United States taxes, penalties, interest and other
     expenses, costs and losses incurred or payable by (i) the Administrative
     Agent as a result of such Lender's failure to submit any form or
     certificate that it is required to provide pursuant to this Section 4.06 or
     (ii) the Borrower or the Administrative Agent as a result of their reliance
     on any such form or certificate which such Lender has provided to them
     pursuant to this Section 4.06.

               (ii) For any period with respect to which a Lender has failed to
     provide the Borrower with the form required pursuant to this Section 4.06,
     if any, (other than if such failure is due to a change in a Governmental
     Requirement occurring subsequent to the date on which a form originally was
     required to be provided), such Lender shall not be entitled to
     indemnification under Section 4.06 with respect to taxes imposed by the
     United States which taxes would not have been imposed but for such failure
     to provide such forms; provided, however, that if a Lender, which is
     otherwise exempt from or subject to a reduced rate of withholding tax,
     becomes subject to taxes because of its failure to deliver a form required
     hereunder, the Borrower shall take such steps as such Lender shall
     reasonably request to assist such Lender to recover such taxes.

               (iii)  Any Lender claiming any additional amounts payable
     pursuant to this Section 4.06 shall use reasonable efforts (consistent with
     legal and regulatory restrictions) to file any certificate or document
     requested by the Borrower or the Administrative Agent or to change the
     jurisdiction of its Applicable Lending Office or to contest any tax imposed
     if the making of such a filing or change or contesting such tax would avoid
     the need for or reduce the amount of any such additional amounts that may
     thereafter accrue and would not, in the sole determination of such Lender,
     be otherwise disadvantageous to such Lender.

     Section 4.07 Disposition of Proceeds. The Mortgage contains an assignment
by the Borrower unto and in favor of the Administrative Agent for the benefit of
the Lenders of all production and all proceeds attributable thereto which may be
produced from or allocated to the Mortgaged Property, and the Mortgage further
provides in general for the application of such proceeds to the satisfaction of
the Obligations and other indebtedness, liabilities and obligations described
therein and secured thereby. Notwithstanding the assignment contained in the
Mortgage, until the occurrence of an Event of Default, the Lenders agree that
they will neither notify the purchaser or purchasers of such production nor take
any other action to cause such

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<PAGE>

proceeds to be remitted to the Lenders, but the Lenders will instead permit such
proceeds to be paid to the Borrower.

                                   ARTICLE V

                     CAPITAL ADEQUACY AND ADDITIONAL COSTS

Section 5.01  Additional Costs.

          (a) LIBOR Regulations, etc.  The Borrower shall pay directly to each
     Lender from time to time such amounts as such Lender may determine to be
     necessary to compensate such Lender for any costs which it determines are
     attributable to its making or maintaining of any LIBOR Loans or issuing or
     participating in Letters of Credit hereunder or its obligation to make any
     LIBOR Loans or issue or participate in any Letters of Credit hereunder, or
     any reduction in any amount receivable by such Lender hereunder in respect
     of any of such LIBOR Loans, Letters of Credit or such obligation (such
     increases in costs and reductions in amounts receivable being herein called
     "Additional Costs"), resulting from any Regulatory Change which: (i)
     changes the basis of taxation of any amounts payable to such Lender under
     this Agreement or any Note in respect of any of such LIBOR Loans or Letters
     of Credit (other than taxes imposed on the overall net income of such
     Lender or of its Applicable Lending Office for any of such LIBOR Loans by
     the jurisdiction in which such Lender has its principal office or
     Applicable Lending Office); or (ii) imposes or modifies any reserve,
     special deposit, minimum capital, capital ratio or similar requirements
     relating to any extensions of credit or other assets of, or any deposits
     with or other liabilities of such Lender, or the Commitment or Loans of
     such Lender or the London interbank market; or (iii) imposes any other
     condition affecting this Agreement or any Note (or any of such extensions
     of credit or liabilities) or such Lender's Commitment or Loans.  Each
     Lender will notify the Administrative Agent and the Borrower of any event
     occurring after the Closing Date which will entitle such Lender to
     compensation pursuant to this Section 5.01(a) as promptly as practicable
     after it obtains knowledge thereof and determines to request such
     compensation, and will designate a different Applicable Lending Office for
     the Loans of such Lender affected by such event if such designation will
     avoid the need for, or reduce the amount of, such compensation and will
     not, in the sole opinion of such Lender, be disadvantageous to such Lender,
     provided that such Lender shall have no obligation to so designate an
     Applicable Lending Office located in the United States.  If any Lender
     requests compensation from the Borrower under this Section 5.01(a), the
     Borrower may, by notice to such Lender, suspend the obligation of such
     Lender to make additional Loans of the Type with respect to which such
     compensation is requested until the Regulatory Change giving rise to such
     request ceases to be in effect (in which case the provisions of Section
     5.04 shall be applicable).

          (b) Regulatory Change. Without limiting the effect of the provisions
     of Section 5.01(a), in the event that at any time (by reason of any
     Regulatory Change or any other circumstances arising after the Closing Date
     affecting (A) any Lender, (B) the London interbank market or (C) such
     Lender's position in such market), the LIBOR Rate, as determined in good
     faith by such Lender, will not adequately and fairly reflect the cost

                                       33
<PAGE>

     to such Lender of funding its LIBOR Loans, then, if such Lender so elects,
     by notice to the Borrower and the Administrative Agent, the obligation of
     such Lender to make additional LIBOR Loans shall be suspended until such
     Regulatory Change or other circumstances ceases to be in effect (in which
     case the provisions of Section 5.04 shall be applicable).

          (c) Capital Adequacy.  Without limiting the effect of the foregoing
     provisions of this Section 5.01 (but without duplication), the Borrower
     shall pay directly to any Lender from time to time on request such amounts
     as such Lender may reasonably determine to be necessary to compensate such
     Lender or its parent or holding company for any costs which it determines
     are attributable to the maintenance by such Lender or its parent or holding
     company (or any Applicable Lending Office), pursuant to any Governmental
     Requirement following any Regulatory Change, of capital in respect of its
     Commitment, its Note, or its Loans or any interest held by it in any Letter
     of Credit, such compensation to include, without limitation, an amount
     equal to any reduction of the rate of return on assets or equity of such
     Lender or its parent or holding company (or any Applicable Lending Office)
     to a level below that which such Lender or its parent or holding company
     (or any Applicable Lending Office) could have achieved but for such
     Governmental Requirement.  Such Lender will notify the Borrower that it is
     entitled to compensation pursuant to this Section 5.01(c) as promptly as
     practicable after it determines to request such compensation.

          (d) Compensation Procedure.  Any Lender notifying the Borrower of the
     incurrence of Additional Costs under this Section 5.01 shall in such notice
     to the Borrower and the Administrative Agent set forth in reasonable detail
     the basis and amount of its request for compensation.  Determinations and
     allocations by each Lender for purposes of this Section 5.01 of the effect
     of any Regulatory Change pursuant to Section 5.01(a) or (b), or of the
     effect of capital maintained pursuant to Section 5.01(c), on its costs or
     rate of return of maintaining Loans or its obligation to make Loans or
     issue Letters of Credit, or on amounts receivable by it in respect of Loans
     or Letters of Credit, and of the amounts required to compensate such Lender
     under this Section 5.01, shall be conclusive and binding for all purposes,
     provided that such determinations and allocations are made on a reasonable
     basis.  Any request for additional compensation under this Section 5.01
     shall be paid by the Borrower within thirty (30) days of the receipt by the
     Borrower of the notice described in this Section 5.01(d)(c).

     Section 5.02 Limitation on LIBOR Loans. Anything herein to the contrary
notwithstanding, if, on or prior to the determination of any LIBOR Rate for any
Interest Period:

               (i) the Administrative Agent determines (which determination
     shall be conclusive, absent manifest error) that quotations of interest
     rates for the relevant deposits referred to in the definition of "LIBOR
     Rate" in Section 1.02 are not being provided in the relevant amounts or for
     the relevant maturities for purposes of determining rates of interest for
     LIBOR Loans as provided herein; or

               (ii) the Administrative Agent determines (which determination
     shall be conclusive, absent manifest error) that the relevant rates of
     interest referred to in the definition of "LIBOR Rate" in Section 1.02 upon
     the basis of which the rate of interest

                                       34
<PAGE>

     for LIBOR Loans for such Interest Period is to be determined are not
     sufficient to adequately cover the cost to the Lenders of making or
     maintaining LIBOR Loans;

then the Administrative Agent shall give the Borrower prompt notice thereof, and
so long as such condition remains in effect, the Lenders shall be under no
obligation to make additional LIBOR Loans.

     Section 5.03 Illegality. Notwithstanding any other provision of this
Agreement, in the event that it becomes unlawful for any Lender or its
Applicable Lending Office to honor its obligation to make or maintain LIBOR
Loans hereunder, then such Lender shall promptly notify the Borrower thereof and
such Lender's obligation to make LIBOR Loans shall be suspended until such time
as such Lender may again make and maintain LIBOR Loans (in which case the
provisions of Section 5.04 shall be applicable).

     Section 5.04 Base Rate Loans Pursuant to Sections 5.01, 5.02 and 5.03. If
the obligation of any Lender to make LIBOR Loans shall be suspended pursuant to
Sections 5.01, 5.02 or 5.03 ("Affected Loans"), all Affected Loans which would
otherwise be made by such Lender shall be made instead as Base Rate Loans (and,
if an event referred to in Section 5.01(b) or Section 5.03 has occurred and such
Lender so requests by notice to the Borrower, all Affected Loans of such Lender
then outstanding shall be automatically converted into Base Rate Loans on the
date specified by such Lender in such notice) and, to the extent that Affected
Loans are so made as (or converted into) Base Rate Loans, all payments of
principal which would otherwise be applied to such Lender's Affected Loans shall
be applied instead to its Base Rate Loans.

     Section 5.05 Compensation. The Borrower shall pay to each Lender within
thirty (30) days of receipt of written request of such Lender (which request
shall set forth, in reasonable detail, the basis for requesting such amounts and
which shall be conclusive and binding for all purposes provided that such
determinations are made on a reasonable basis), such amount or amounts as shall
compensate it for any loss, cost, expense or liability which such Lender
determines are attributable to:

               (i) any payment, prepayment or conversion of a LIBOR Loan
     properly made by such Lender or the Borrower for any reason (including,
     without limitation, the acceleration of the Loans pursuant to Section
     10.01) on a date other than the last day of the Interest Period for such
     Loan; or

               (ii) any failure by the Borrower for any reason (including but
     not limited to, the failure of any of the conditions precedent specified in
     Article VI to be satisfied) to borrow, continue or convert a LIBOR Loan
     from such Lender on the date for such borrowing, continuation or conversion
     specified in the relevant notice given pursuant to Section 2.02(c).

Without limiting the effect of the preceding sentence, such compensation shall
include an amount equal to the excess, if any, of (i) the amount of interest
which would have accrued on the principal amount so paid, prepaid or converted
or not borrowed for the period from the date of such payment, prepayment or
conversion or failure to borrow to the last day of the Interest Period for such
Loan (or, in the case of a failure to borrow, the Interest Period for such Loan
which would have commenced on the date specified for such borrowing) at the
applicable rate of

                                       35
<PAGE>

interest for such Loan provided for herein over (ii) the interest component of
the amount such Lender would have bid in the London interbank market for Dollar
deposits of leading banks in amounts comparable to such principal amount and
with maturities comparable to such period (as reasonably determined by such
Lender).

     Section 5.06  Replacement Lenders.

          (a) If any Lender has notified the Borrower and the Agent of its
     incurring Additional Costs under Section 5.01 or has required the Borrower
     to make payments for Taxes under Section 4.06, then the Borrower may,
     unless such Lender has notified the Borrower and the Agent that the
     circumstances giving rise to such notice no longer apply, terminate, in
     whole but not in part, the Commitment of any Lender (other than the Agent)
     (the "Terminated Lender") at any time upon five (5) Business Days' prior
     written notice to the Terminated Lender and the Agent (such notice referred
     to herein as a "Notice of Termination").

          (b) In order to effect the termination of the Commitment of the
     Terminated Lender, the Borrower shall: (i) obtain an agreement with one or
     more Lenders to increase their Commitment or Commitments and/or (ii)
     request any one or more other banking institutions to become parties to
     this Agreement in place and instead of such Terminated Lender and agree to
     accept a Commitment or Commitments; provided, however, that such one or
     more other banking institutions are reasonably acceptable to the Agent and
     become parties by executing an Assignment (the Lenders or other banking
     institutions that agree to accept in whole or in part the Commitment of the
     Terminated Lender being referred to herein as the "Replacement Lenders"),
     such that the aggregate increased and/or accepted Commitments of the
     Replacement Lenders under clauses (i) and (ii) above equal the Commitment
     of the Terminated Lender.

          (c) The Notice of Termination shall include the name of the Terminated
     Lender, the date the termination will occur (the "Lender Termination
     Date"), and the Replacement Lender or Replacement Lenders to which the
     Terminated Lender will assign its Commitment and, if there will be more
     than one Replacement Lender, the portion of the Terminated Lender's
     Commitment to be assigned to each Replacement Lender.

          (d) On the Lender Termination Date, (i) the Terminated Lender shall by
     execution and delivery of an Assignment assign its Commitment to the
     Replacement Lender or Replacement Lenders (pro rata, if there is more than
     one Replacement Lender, in proportion to the portion of the Terminated
     Lender's Commitment to be assigned to each Replacement Lender) indicated in
     the Notice of Termination and shall assign to the Replacement Lender or
     Replacement Lenders each of its Loans (if any) then outstanding and
     participation interests in Letters of Credit (if any) then outstanding pro
     rata as aforesaid), (ii) the Terminated Lender shall endorse its Note,
     payable without recourse, representation or warranty to the order of the
     Replacement Lender or Replacement Lenders (pro rata as aforesaid), (iii)
     the Replacement Lender or Replacement Lenders shall purchase the Note held
     by the Terminated Lender (pro rata as aforesaid) at a price equal to the
     unpaid principal amount thereof plus interest and facility and other fees
     accrued and unpaid to the Lender Termination Date, and (iv) the Replacement
     Lender or

                                       36
<PAGE>

     Replacement Lenders will thereupon (pro rata as aforesaid) succeed to and
     be substituted in all respects for the Terminated Lender with like effect
     as if becoming a Lender pursuant to the terms of Section 12.06(b), and the
     Terminated Lender will have the rights and benefits of an assignor under
     Section 12.06(b). To the extent not in conflict, the terms of Section
     12.06(b) shall supplement the provisions of this Section 5.06(d). For each
     assignment made under this Section 5.06, the Replacement Lender shall pay
     to the Agent the processing fee provided for in Section 12.06(b). The
     Borrower will be responsible for the payment of any breakage costs
     associated with termination and Replacement Lenders, as set forth in
     Section 5.05.

                                  ARTICLE VI

                              CONDITIONS PRECEDENT

     Section 6.01  Initial Funding.

          The obligation of the Lenders to make the Initial Funding is subject
     to the receipt by the Administrative Agent and the Lenders of all fees
     payable pursuant to Section 2.04 on or before the Closing Date and the
     receipt by the Administrative Agent of the following documents (in
     sufficient original counterparts, other than the Notes, for each Lender)
     and satisfaction of the other conditions provided in this Section 6.01,
     each of which shall be reasonably satisfactory to the Administrative Agent
     in form and substance:

          (a) A certificate of the Secretary or an Assistant Secretary of the
     Borrower setting forth (i) resolutions of its board of directors with
     respect to the authorization of the Borrower to execute and deliver the
     Loan Documents to which it is a party and to enter into the transactions
     contemplated in those documents, (ii) the officers of the Borrower (y) who
     are authorized to sign the Loan Documents to which the Borrower is a party
     and (z) who will, until replaced by another officer or officers duly
     authorized for that purpose, act as its representative for the purposes of
     signing documents and giving notices and other communications in connection
     with this Agreement and the transactions contemplated hereby, (iii)
     specimen signatures of the authorized officers, and (iv) the articles or
     certificate of incorporation and bylaws of the Borrower, certified as being
     true and complete.  The Administrative Agent and the Lenders may
     conclusively rely on such certificate until the Administrative Agent
     receives notice in writing from the Borrower to the contrary.

          (b) Certificates of the appropriate state agencies with respect to the
     existence, qualification and good standing of the Borrower.

          (c) A compliance certificate which shall be substantially in the form
     of Exhibit C, duly and properly executed by a Responsible Officer and dated
     as of the date of the Initial Funding.

          (d) The Notes, duly completed and executed.

                                       37
<PAGE>

          (e) The Security Instruments, including those described on Exhibit D,
     duly completed and executed in sufficient number of counterparts for
     recording, if necessary.

          (f) An opinion of Jackson Walker L.L.P., counsel to the Borrower, in
     form and substance satisfactory to the Administrative Agent, as to such
     matters incident to the transactions herein contemplated as the
     Administrative Agent may reasonably request.

          (g) A certificate of insurance coverage of the Borrower evidencing
     that the Borrower is carrying insurance in accordance with Section 7.19.

          (h) Title information as the Administrative Agent may require, in form
     and substance reasonably satisfactory to the Administrative Agent, setting
     forth the status of title to at least 90% of the value of the Oil and Gas
     Properties included in the Initial Reserve Report.

          (i) The Security Instruments and related financing statements covering
     the Mortgaged Property shall have been properly filed and recorded in the
     appropriate offices to establish and perfect the Liens and security
     interests created thereby.

          (j) The Administrative Agent shall have been furnished with
     appropriate UCC search certificates reflecting no prior Liens.

          (k) The Administrative Agent shall have completed and be satisfied
     with the results of due diligence relating to Engineering Reports,
     environmental reports, financial statements, balancing agreement positions,
     bonding requirements, joint interest billings and Hedging Agreements, as
     each relates to the Borrower and its Oil and Gas Properties.

          (l) A monthly cash flow forecast, in form and substance reasonably
     satisfactory to the Administrative Agent, through September 30, 2001
     regarding capital expenditures, working capital payments and payments made
     in connection with Hedging Agreements.

          (m) All Debt owed or owing to The Chase Manhattan Bank and Aquila
     Energy Capital Corporation, their Affiliates, successors or assigns, with
     the exception of the liability of the Borrower under the related Letter of
     Credit Agreement with The Chase Manhattan Bank and the Letter of Credit
     listed in Schedule 9.01, shall have been paid in full and all funding
     commitments from such parties shall have been terminated.

          (n) Such other documents as the Administrative Agent or any Lender or
     special counsel to the Administrative Agent may reasonably request.

          (o) The transactions relating to the Aquila Buy-Back and the Closing
     Hedging Agreements shall have been completed and all documents to be
     entered into in connection therewith shall have been executed and
     delivered.

     Section 6.02  Initial and Subsequent Loans and Letters of Credit.  The
obligation of the Lenders to make Loans to the Borrower upon the occasion of
each borrowing hereunder and to issue, renew, extend or reissue Letters of
Credit for the account of the Borrower (including the

                                       38
<PAGE>

Initial Funding) is subject to the further conditions precedent that, as of the
date of such Loans and after giving effect thereto:

          (a)  no Default shall exist;

          (b) no Material Adverse Effect shall have occurred; and

          (c) the representations and warranties made by the Borrower in Article
     VII and in the Security Instruments shall be true on and as of the date of
     the making of such Loans or issuance, renewal, extension or reissuance of a
     Letter of Credit with the same force and effect as if made on and as of
     such date and following such new borrowing, except to the extent such
     representations and warranties are expressly limited to an earlier date or
     the Majority Lenders may expressly consent in writing to the contrary.

     Each request for a borrowing or issuance, renewal, extension or reissuance
of a Letter of Credit by the Borrower hereunder shall constitute a certification
by the Borrower to the effect set forth in Section 6.02(c) (both as of the date
of such notice and, unless the Borrower otherwise notifies the Administrative
Agent prior to the date of and immediately following such borrowing or issuance,
renewal, extension or resistance of a Letter of Credit as of the date thereof).

     Section 6.03 Conditions Precedent for the Benefit of Lenders. All
conditions precedent to the obligations of the Lenders to make any Loan are
imposed hereby solely for the benefit of the Lenders, and no other Person may
require satisfaction of any such condition precedent or be entitled to assume
that the Lenders will refuse to make any Loan in the absence of strict
compliance with such conditions precedent.

     Section 6.04 No Waiver. No waiver of any condition precedent shall preclude
the Administrative Agent or the Lenders from requiring such condition to be met
prior to making any subsequent Loan or preclude the Lenders from thereafter
declaring that the failure of the Borrower to satisfy such condition precedent
constitutes a Default.

                                  ARTICLE VII

                         REPRESENTATIONS AND WARRANTIES

          The Borrower represents and warrants to the Administrative Agent and
     the Lenders that (each representation and warranty herein is given as of
     the Closing Date and shall be deemed repeated and reaffirmed on the dates
     of each borrowing and issuance, renewal, extension or resistance of a
     Letter of Credit as provided in Section 6.02):

     Section 7.01 Corporate Existence. The Borrower and each of its
Subsidiaries: (i) is a corporation duly organized, legally existing and in good
standing under the laws of the jurisdiction of its incorporation; (ii) has all
requisite corporate power, and has all material governmental licenses,
authorizations, consents and approvals necessary to own its assets and carry on
its business as now being or as proposed to be conducted; and (iii) is qualified
to do business in all jurisdictions in which the nature of the business
conducted by it makes such qualification necessary and where failure so to
qualify would have a Material Adverse Effect.

                                       39
<PAGE>

     Section 7.02 Financial Condition. The audited consolidated balance sheet of
the Borrower and its Consolidated Subsidiaries as at each of December 31, 1997,
December 31, 1998, December 31, 1999 and December 31, 2000 and the related
consolidated statement of income, stockholders' equity and cash flow of the
Borrower and its Consolidated Subsidiaries for the fiscal year ended on each of
said dates, with the opinion thereon of KPMG L.L.P. heretofore furnished to each
of the Lenders are complete and correct and fairly present the consolidated
financial condition of the Borrower and its Consolidated Subsidiaries as at said
dates and the results of its operations for such fiscal years, all in accordance
with GAAP, as applied on a consistent basis. Neither the Borrower nor any
Subsidiary has on the Closing Date any material Debt, contingent liabilities,
liabilities for taxes, unusual forward or long-term commitments or unrealized or
anticipated losses from any unfavorable commitments, except as referred to or
reflected or provided for in the Financial Statements or in Schedule 7.02. Since
December 31, 2000, there has been no change or event having a Material Adverse
Effect. Since the date of the most recent Financial Statements, neither the
business nor the Properties of the Borrower or any Subsidiary have been
materially and adversely affected as a result of any fire, explosion,
earthquake, flood, drought, windstorm, accident, strike or other labor
disturbance, embargo, requisition or taking of Property or cancellation of
contracts, permits or concessions by any Governmental Authority, riot,
activities of armed forces or acts of God or of any public enemy.

     Section 7.03 Litigation. Except as disclosed to the Lenders in Schedule
7.03 hereto, at the Closing Date there is no litigation, legal, administrative
or arbitrage proceeding, investigation or other action of any nature pending or,
to the knowledge of the Borrower, threatened against or affecting the Borrower
or any Subsidiary which involves the possibility of any judgment or liability
against the Borrower or any Subsidiary not fully covered by insurance (except
for normal deductibles) and which would have a Material Adverse Effect.

     Section 7.04 No Breach. Neither the execution and delivery of the Loan
Documents, nor compliance with the terms and provisions hereof will conflict
with or result in a breach of, or require any consent which has not been
obtained as of the Closing Date under, the respective charter or by-laws of the
Borrower or any Subsidiary, or any Governmental Requirement or any agreement or
instrument to which the Borrower or any Subsidiary is a party or by which it is
bound or to which it or its Properties are subject, or constitute a default
under any such agreement or instrument, or result in the creation or imposition
of any Lien upon any of the revenues or assets of the Borrower or any Subsidiary
pursuant to the terms of any such agreement or instrument other than the Liens
created by any of the Loan Documents.

     Section 7.05 Authority. The Borrower has all necessary corporate power and
authority to execute, deliver and perform its obligations under the Loan
Documents to which it is a party; and the execution, delivery and performance by
the Borrower of the Loan Documents to which it is a party have been duly
authorized by all necessary corporate action on its part; and the Loan Documents
to which it is a party constitute the legal, valid and binding obligations of
the Borrower, enforceable in accordance with their terms.

     Section 7.06 Approvals. No authorizations, approvals or consents of, and no
filings or registrations with, any Governmental Authority are necessary for the
execution, delivery or performance by the Borrower of the Loan Documents to
which is a party or for the validity or enforceability thereof, except for the
routine recording and filing of certain of the Security Instruments.

                                       40
<PAGE>

     Section 7.07 Use of Loans. The proceeds of the Loans shall be used to
retire existing Debt of the Borrower and for the acquisition and development by
the Borrower of its Oil and Gas Properties and working capital in connection
therewith. The Borrower is not engaged principally, or as one of its important
activities, in the business of extending credit for the purpose, whether
immediate, incidental or ultimate, of buying or carrying margin stock (within
the meaning of Regulation T, U or X of the Board of Governors of the Federal
Reserve System) and no part of the proceeds of any Loan hereunder will be used
to buy or carry any margin stock.

     Section 7.08 ERISA.

          (a) The Borrower, each Subsidiary and each ERISA Affiliate have
     complied in all material respects with ERISA and, where applicable, the
     Code regarding each Plan.

          (b) Each Plan is, and has been, maintained in substantial compliance
     with ERISA and, where applicable, the Code.

          (c) No act, omission or transaction has occurred which could result in
     imposition on the Borrower, any Subsidiary or any ERISA Affiliate (whether
     directly or indirectly) of (i) either a civil penalty assessed pursuant to
     section 502(c), (i) or (l) of ERISA or a tax imposed pursuant to Chapter 43
     of Subtitle D of the Code or (ii) breach of fiduciary duty liability
     damages under section 409 of ERISA.

          (d) No Plan (other than a defined contribution plan) or any trust
     created under any such Plan has been terminated since September 2, 1974.
     No liability to the PBGC (other than for the payment of current premiums
     which are not past due) by the Borrower, any Subsidiary or any ERISA
     Affiliate has been or is expected by the Borrower, any Subsidiary or any
     ERISA Affiliate to be incurred with respect to any Plan.  No ERISA Event
     with respect to any Plan has occurred.

          (e) Full payment when due has been made of all amounts which the
     Borrower, any Subsidiary or any ERISA Affiliate is required under the terms
     of each Plan or applicable law to have paid as contributions to such Plan,
     and no accumulated funding deficiency (as defined in section 302 of ERISA
     and section 412 of the Code), whether or not waived, exists with respect to
     any Plan.

          (f) The actuarial present value of the benefit liabilities under each
     Plan which is subject to Title IV of ERISA does not, as of the end of the
     Borrower's most recently ended fiscal year, exceed the current value of the
     assets (computed on a plan termination basis in accordance with Title IV of
     ERISA) of such Plan allocable to such benefit liabilities.  The term
     "actuarial present value of the benefit liabilities" shall have the meaning
     specified in section 4041 of ERISA.

          (g) None of the Borrower, any Subsidiary or any ERISA Affiliate
     sponsors, maintains, or contributes to an employee welfare benefit plan, as
     defined in section 3(1) of ERISA, including, without limitation, any such
     plan maintained to provide benefits to former employees of such entities,
     that may not be terminated by the Borrower, a Subsidiary or any ERISA
     Affiliate in its sole discretion at any time without any material
     liability.

                                       41
<PAGE>

          (h) None of the Borrower, any Subsidiary or any ERISA Affiliate
     sponsors, maintains or contributes to, or has at any time in the preceding
     six calendar years, sponsored, maintained or contributed to, any
     Multiemployer Plan.

          (i) None of the Borrower, any Subsidiary or any ERISA Affiliate is
     required to provide security under section 401(a)(29) of the Code due to a
     Plan amendment that results in an increase in current liability for the
     Plan.

     Section 7.09 Taxes. Except as set out in Schedule 7.09, each of the
Borrower and its Subsidiaries has filed all United States federal income tax
returns and all other tax returns which are required to be filed (giving effect
to any timely filed extensions) by them and have paid all material taxes due
pursuant to such returns or pursuant to any assessment received by the Borrower
or any Subsidiary. The charges, accruals and reserves on the books of the
Borrower and its Subsidiaries in respect of taxes and other governmental charges
are, in the opinion of the Borrower, adequate. No tax lien has been filed and,
to the knowledge of the Borrower, no claim is being asserted with respect to any
such tax, fee or other charge.

     Section 7.10 Titles, etc.

          (a) Except as set out in Schedule 7.10, each of the Borrower and its
     Subsidiaries has good and indefeasible title to its material (individually
     or in the aggregate) Properties comprising real or immovable property and
     good and marketable title to its material (individually or in the
     aggregate) Properties comprising personal or moveable property, free and
     clear of all Liens, except Liens permitted by Section 9.02. Except as set
     forth in Schedule 7.10, after giving full effect to the Excepted Liens, the
     Borrower owns the net interests in production attributable to the
     Hydrocarbon Interests reflected in the most recently delivered Reserve
     Report and the ownership of such Properties shall not in any material
     respect obligate the Borrower to bear the costs and expenses relating to
     the maintenance, development and operations of each such Property in an
     amount in excess of the working interest of each Property set forth in the
     most recently delivered Reserve Report.  All information contained in the
     most recently delivered Reserve Report is true and correct in all material
     respects as of the date thereof.

          (b) All leases and agreements necessary for the conduct of the
     business of the Borrower and its Subsidiaries are valid and subsisting, in
     full force and effect and there exists no default or event or circumstance
     which with the giving of notice or the passage of time or both would give
     rise to a default under any such lease or leases, which would affect in any
     material respect the conduct of the business of the Borrower and its
     Subsidiaries.

          (c) The rights, Properties and other assets presently owned, leased or
     licensed by the Borrower and its Subsidiaries including, without
     limitation, all easements and rights of way, include all rights, Properties
     and other assets necessary to permit the Borrower and its Subsidiaries to
     conduct their business in all material respects in the same manner as its
     business has been conducted prior to the Closing Date.

                                       42
<PAGE>

          (d) All of the assets and Properties of the Borrower and its
     Subsidiaries which are reasonably necessary for the operation of its
     business are in good working condition and are maintained in accordance
     with prudent business standards.

          (e) The Borrower is approved by the Minerals Management Service to own
     interests in and serve as operator of United States federal offshore Oil
     and Gas Properties.

     Section 7.11 No Material Misstatements. No written information, statement,
exhibit, certificate, document or report furnished to the Administrative Agent
and the Lenders (or any of them) by the Borrower or any Subsidiary in connection
with the negotiation of this Agreement contained any material misstatement of
fact or omitted to state a material fact or any fact necessary to make the
statement contained therein not materially misleading in the light of the
circumstances in which made and with respect to the Borrower and its
Subsidiaries taken as a whole. There is no fact peculiar to the Borrower or any
Subsidiary which has a Material Adverse Effect or in the future is reasonably
likely to have (so far as the Borrower can now foresee) a Material Adverse
Effect and which has not been set forth in this Agreement or the other
documents, certificates and statements furnished to the Administrative Agent by
or on behalf of the Borrower or any Subsidiary prior to, or on, the Closing Date
in connection with the transactions contemplated hereby.

     Section 7.12 Investment Company Act. Neither the Borrower nor any
Subsidiary is an "investment company" or a company "controlled" by an
"investment company," within the meaning of the Investment Company Act of 1940,
as amended.

     Section 7.13 Public Utility Holding Company Act. Neither the Borrower nor
any Subsidiary is a "holding company," or a "subsidiary company" of a "holding
company," or an "affiliate" of a "holding company" or of a "subsidiary company"
of a "holding company," or a "public utility" within the meaning of the Public
Utility Holding Company Act of 1935, as amended.

     Section 7.14 Subsidiaries. Except as set forth on Schedule 7.14, the
Borrower has no Subsidiaries. Except for ATP (UK), none of the Subsidiaries own
any Property or any interest in any Property of any material value.

     Section 7.15 Location of Business and Offices. The Borrower's principal
place of business and chief executive offices are located at the address stated
on the signature page of this Agreement. The principal place of business and
chief executive office of each Subsidiary are located at the addresses stated on
Schedule 7.14.

     Section 7.16 Defaults. Neither the Borrower nor any Subsidiary is in
default nor has any event or circumstance occurred which, but for the expiration
of any applicable grace period or the giving of notice, or both, would
constitute a default under any material agreement or instrument to which the
Borrower or any Subsidiary is a party or by which the Borrower or any Subsidiary
is bound which default would have a Material Adverse Effect. No Default
hereunder has occurred and is continuing.

                                       43
<PAGE>

     Section 7.17 Environmental Matters. Except (i) as provided in Schedule 7.17
or (ii) as would not have a Material Adverse Effect (or with respect to (c), (d)
and (e) below, where the failure to take such actions would not have a Material
Adverse Effect):

          (a) Neither any Property of the Borrower or any Subsidiary nor the
     operations conducted thereon violate any order or requirement of any court
     or Governmental Authority or any Environmental Laws;

          (b) Without limitation of clause (a) above, no Property of the
     Borrower or any Subsidiary nor the operations currently conducted thereon
     or, to the best knowledge of the Borrower, by any prior owner or operator
     of such Property or operation, are in violation of or subject to any
     existing, pending or threatened action, suit, investigation, inquiry or
     proceeding by or before any court or Governmental Authority or to any
     remedial obligations under Environmental Laws;

          (c) All notices, permits, licenses or similar authorizations, if any,
     required to be obtained or filed in connection with the operation or use of
     any and all Property of the Borrower and each Subsidiary, including without
     limitation past or present treatment, storage, disposal or release of a
     hazardous substance or solid waste into the environment, have been duly
     obtained or filed, and the Borrower and each Subsidiary are in compliance
     with the terms and conditions of all such notices, permits, licenses and
     similar authorizations;

          (d) All hazardous substances, solid waste, and oil and gas exploration
     and production wastes, if any, generated at any and all Property of the
     Borrower or any Subsidiary have in the past been transported, treated and
     disposed of in accordance with Environmental Laws and so as not to pose an
     imminent and substantial endangerment to public health or welfare or the
     environment, and, to the best knowledge of the Borrower, all such transport
     carriers and treatment and disposal facilities have been and are operating
     in compliance with Environmental Laws and so as not to pose an imminent and
     substantial endangerment to public health or welfare or the environment,
     and are not the subject of any existing, pending or threatened action,
     investigation or inquiry by any Governmental Authority in connection with
     any Environmental Laws;

          (e) The Borrower has taken all steps reasonably necessary to determine
     and has determined that no hazardous substances, solid waste, or oil and
     gas exploration and production wastes, have been disposed of or otherwise
     released and there has been no threatened release of any hazardous
     substances on or to any Property of the Borrower or any Subsidiary except
     in compliance with Environmental Laws and so as not to pose an imminent and
     substantial endangerment to public health or welfare or the environment;

          (f) To the extent applicable, all Property of the Borrower and each
     Subsidiary currently satisfies all design, operation, and equipment
     requirements imposed by the OPA or scheduled as of the Closing Date to be
     imposed by OPA during the term of this Agreement, and the Borrower does not
     have any reason to believe that such Property, to the extent subject to
     OPA, will not be able to maintain compliance with the OPA requirements
     during the term of this Agreement; and

                                       44
<PAGE>

          (g) Neither the Borrower nor any Subsidiary has any known contingent
     liability in connection with any release or threatened release of any oil,
     hazardous substance or solid waste into the environment.

     Section 7.18 Compliance with the Law. Neither the Borrower nor any
Subsidiary has violated any Governmental Requirement or failed to obtain any
license, permit, franchise or other governmental authorization necessary for the
ownership of any of its Properties or the conduct of its business, which
violation or failure would have (in the event such violation or failure were
asserted by any Person through appropriate action) a Material Adverse Effect.
Except for such acts or failures to act as would not have a Material Adverse
Effect, the Oil and Gas Properties (and properties unitized therewith) have been
maintained, operated and developed in a good and workmanlike manner and in
conformity with all applicable laws and all rules, regulations and orders of all
duly constituted authorities having jurisdiction and in conformity with the
provisions of all leases, subleases or other contracts comprising a part of the
Hydrocarbon Interests and other contracts and agreements forming a part of the
Oil and Gas Properties; specifically in this connection, (i) after the Closing
Date, no Oil and Gas Property is subject to having allowable production reduced
below the full and regular allowable (including the maximum permissible
tolerance) because of any overproduction (whether or not the same was
permissible at the time) prior to the Closing Date and (ii) none of the wells
comprising a part of the Oil and Gas Properties (or properties unitized
therewith) are deviated from the vertical more than the maximum permitted by
applicable laws, regulations, rules and orders, and such wells are, in fact,
bottomed under and are producing from, and the well bores are wholly within, the
Oil and Gas Properties (or in the case of wells located on properties unitized
therewith, such unitized properties).

     Section 7.19 Insurance. Schedule 7.19 attached hereto contains an accurate
and complete description of all material policies of fire, liability, workmen's
compensation and other forms of insurance owned or held by the Borrower and each
Subsidiary. All such policies are in full force and effect, all premiums with
respect thereto covering all periods up to and including the date of the closing
have been paid, and no notice of cancellation or termination has been received
with respect to any such policy. Such policies are sufficient for compliance
with all requirements of law and of all agreements to which the Borrower or any
Subsidiary is a party; are valid, outstanding and enforceable policies; provide
adequate insurance coverage in at least such amounts and against at least such
risks (but including in any event public liability) as are usually insured
against in the same general area by companies engaged in the same or a similar
business for the assets and operations of the Borrower and each Subsidiary; will
remain in full force and effect through the respective dates set forth in
Schedule 7.19 without the payment of additional premiums; and will not in any
way be affected by, or terminate or lapse by reason of, the transactions
contemplated by this Agreement.  Schedule 7.19 identifies all material risks, if
any, which the Borrower and its Subsidiaries and their respective Board of
Directors or officers have designated as being self insured.  Neither the
Borrower nor any Subsidiary has been refused any insurance with respect to its
assets or operations, nor has its coverage been limited below usual and
customary policy limits, by an insurance carrier to which it has applied for any
such insurance or with which it has carried insurance during the last three
years.

     Section 7.20 Hedging Agreements. Schedule 7.20 sets forth, as of the
Closing Date, a true and complete list of all Hedging Agreements (including
commodity price swap agreements,

                                       45
<PAGE>

forward agreements or contracts of sale which provide for prepayment for
deferred shipment or delivery of oil, gas or other commodities) of th e Borrower
and each Subsidiary, the material terms thereof (including the type, term,
effective date, termination date and notional amounts or volumes), the net mark
to market value thereof, all credit support agreements relating thereto
(including any margin required or supplied), and the counter party to each such
agreement.

     Section 7.21 Restriction on Liens. Neither the Borrower nor any of its
Subsidiaries is a party to any agreement or arrangement (other than this
Agreement and the Security Instruments), or subject to any order, judgment, writ
or decree, which either restricts or purports to restrict its ability to grant
Liens to secure the Obligations against their respective assets or Properties.

     Section 7.22 Material Agreements. Set forth on Schedule 7.22 hereto is a
complete and correct list of all material agreements, leases, indentures,
purchase agreements, obligations in respect of letters of credit, guarantees,
joint venture agreements, and other instruments in effect or to be in effect as
of the Closing Date (other than Hedging Agreements) providing for, evidencing,
securing or otherwise relating to any Debt of the Borrower or any of its
Subsidiaries, and all obligations of the Borrower or any of its Subsidiaries to
issuers of surety or appeal bonds issued for account of the Borrower or any such
Subsidiary, and such list correctly sets forth the names of the debtor or lessee
and creditor or lessor with respect to the Debt or lease obligations outstanding
or to be outstanding and the Property subject to any Lien securing such Debt or
lease obligation. Also set forth on Schedule 7.22 hereto is a complete and
correct list of all material agreements and other instruments of the Borrower
and its Subsidiaries relating to the purchase, transportation by pipeline, gas
processing, marketing, sale and supply of natural gas and other Hydrocarbons.
The Borrower has heretofore delivered to the Administrative Agent and the
Lenders a complete and correct copy of all such material credit agreements,
indentures, purchase agreements, contracts, letters of credit, guarantees, joint
venture agreements, or other instruments, including any modifications or
supplements thereto, as in effect on the Closing Date.

     Section 7.23 Gas Imbalances. Except as set forth on Schedule 7.23 or on the
most recent certificate delivered pursuant to Section 8.07(c), on a net basis
there are no gas imbalances, take or pay or other prepayments with respect to
the Borrower's Oil and Gas Properties which would require the Borrower to
deliver, in the aggregate, two percent (2%) or more of the monthly production of
Hydrocarbons produced from the Borrower's Oil and Gas Properties at some future
time without then or thereafter receiving full payment therefor.

                                 ARTICLE VIII

                             AFFIRMATIVE COVENANTS

          The Borrower covenants and agrees that, so long as any of the
     Commitments are in effect and until payment in full of all Loans hereunder,
     all interest thereon and all other amounts payable by the Borrower
     hereunder:

     Section 8.01 Reporting Requirements. The Borrower shall deliver, or shall
cause to be delivered, to the Administrative Agent with sufficient copies of
each for the Lenders:

                                       46
<PAGE>

          (a) Annual Financial Statements.  As soon as available and in any
     event within 95 days after the end of each fiscal year of the Borrower, the
     audited consolidated and unaudited consolidating statements of income,
     stockholders' equity, changes in financial position and cash flows of the
     Borrower and its Consolidated Subsidiaries for such fiscal year, and the
     related consolidated and consolidating balance sheets of the Borrower and
     its Consolidated Subsidiaries as at the end of such fiscal year, and
     setting forth in each case in comparative form the corresponding figures
     for the preceding fiscal year, and accompanied by the related opinion of
     independent public accountants of recognized national standing reasonably
     acceptable to the Administrative Agent, which opinion shall state that said
     financial statements fairly present the consolidated financial condition
     and results of operations of the Borrower and its Consolidated Subsidiaries
     as at the end of, and for, such fiscal year and that such financial
     statements have been prepared in accordance with GAAP, except for such
     changes in such principles with which the independent public accountants
     shall have concurred and such opinion shall not contain a "going concern"
     or like qualification or exception, and a certificate of such accountants
     stating that, in making the examination necessary for their opinion, they
     verified compliance by the Borrower, as of the end of the relevant fiscal
     year, with Sections 9.13, 9.14 and 9.15.

          (b) Quarterly Financial Statements.  As soon as available and in any
     event within 50 days after the end of each of the first three fiscal
     quarterly periods of each fiscal year of the Borrower, consolidated and
     consolidating statements of income, stockholders' equity, changes in
     financial position and cash flows of the Borrower and its Consolidated
     Subsidiaries for such period and for the period from the beginning of the
     respective fiscal year to the end of such period, and the related
     consolidated and consolidating balance sheets as at the end of such period,
     and setting forth in each case in comparative form the corresponding
     figures for the corresponding period in the preceding fiscal year,
     accompanied by the certificate of a Responsible Officer, which certificate
     shall state that said financial statements fairly present the consolidated
     and consolidating financial condition and results of operations of the
     Borrower and its Consolidated Subsidiaries in accordance with GAAP, as at
     the end of, and for, such period (subject to normal year-end audit
     adjustments).

          (c) Notice of Default, Etc.  Promptly after the Borrower knows that
     any Default or any Material Adverse Effect has occurred, a notice of such
     Default or Material Adverse Effect, describing the same in reasonable
     detail and the action the Borrower proposes to take with respect thereto.

          (d) Other Accounting Reports.  Promptly upon receipt thereof, a copy
     of each other report or letter submitted to the Borrower or any Subsidiary
     by independent accountants in connection with any annual, interim or
     special audit made by them of the books of the Borrower and its
     Subsidiaries, and a copy of any response by the Borrower or any Subsidiary
     of the Borrower, or the Board of Directors of the Borrower or any
     Subsidiary of the Borrower, to such letter or report.

          (e) SEC Filings, Etc.  Promptly upon its becoming available, each
     financial statement, report, notice or proxy statement sent by the Borrower
     to stockholders generally and each regular or periodic report and any
     registration statement, prospectus or

                                       47
<PAGE>

     written communication (other than transmittal letters) in respect thereof
     filed by the Borrower with or received by the Borrower in connection
     therewith from any securities exchange or the SEC or any successor agency.

          (f) Notices Under Other Loan Agreements.  Promptly after the
     furnishing thereof, copies of any statement, report or notice furnished to
     any Person pursuant to the terms of any indenture, loan or credit or other
     similar agreement, other than this Agreement and not otherwise required to
     be furnished to the Lenders pursuant to any other provision of this Section
     8.01.

          (g) Other Matters.  From time to time such other information regarding
     the business, affairs or financial condition of the Borrower or any
     Subsidiary (including, without limitation, any Plan or Multiemployer Plan
     and any reports or other information required to be filed under ERISA) as
     any Lender or the Administrative Agent may reasonably request.

          (h) Hedging Agreements.  As soon as available and in any event within
     ten  Business Days after the last day of each calendar quarter, a report,
     in form and substance satisfactory to the Administrative Agent, setting
     forth as of the last Business Day of such calendar quarter a true and
     complete list of all Hedging Agreements (including commodity price swap
     agreements, forward agreements or contracts of sale which provide for
     prepayment for deferred shipment or delivery of oil, gas or other
     commodities) of the Borrower and each Subsidiary, the material terms
     thereof (including the type, term, effective date, termination date and
     notional amounts or volumes), the net mark to market value therefor, any
     new credit support agreements relating thereto not listed on Schedule 7.22,
     any margin required or supplied under any credit support document, and the
     counter party to each such agreement.

          (i) Cash Flow Forecast.  Concurrently with the delivery of each
     Reserve Report, a report, in form and substance reasonably satisfactory to
     the Administrative Agent, forecasting for the immediately succeeding six
     month period the capital expenditures, payments made in connection with
     Hedging Agreements and working capital payments of the Borrower and its
     Consolidated Subsidiaries.

The Borrower will furnish to the Administrative Agent, at the time it furnishes
each set of financial statements pursuant to paragraph (a) or (b) above, a
certificate substantially in the form of Exhibit C  executed by a Responsible
Officer (i) certifying as to the matters set forth therein and stating that no
Default has occurred and is continuing (or, if any Default has occurred and is
continuing, describing the same in reasonable detail), and (ii) setting forth in
reasonable detail the computations necessary to determine whether the Borrower
is in compliance with Sections 9.13, 9.14 and 9.15 as of the end of the
respective fiscal quarter or fiscal year.

     Section 8.02 Litigation. The Borrower shall promptly give to the
Administrative Agent notice of: (i) all legal or arbitrage proceedings, and of
all proceedings before any Governmental Authority affecting the Borrower or any
Subsidiary, except proceedings which, if adversely determined, would not have a
Material Adverse Effect, and (ii) of any litigation or proceeding against or
adversely affecting the Borrower or any Subsidiary in which the amount involved
is not covered in full by insurance (subject to normal and customary deductibles
and for which the

                                       48
<PAGE>

insurer has not assumed the defense), or in which injunctive or similar relief
is sought. The Borrower will, and will cause each of its Subsidiaries to,
promptly notify the Administrative Agent and each of the Lenders of any claim,
judgment, Lien or other encumbrance (other than an Excepted Lien) affecting any
Property of the Borrower or any Subsidiary if the value of the claim, judgment,
Lien, or other encumbrance affecting such Property shall exceed $100,000.

     Section 8.03 Maintenance, Etc.

          (a) Generally.  The Borrower shall and shall cause each Subsidiary to:
     preserve and maintain its corporate existence and all of its material
     rights, privileges and franchises; keep books of record and account in
     which full, true and correct entries will be made of all dealings or
     transactions in relation to its business and activities; comply with all
     Governmental Requirements if failure to comply with such requirements will
     have a Material Adverse Effect; pay and discharge all taxes, assessments
     and governmental charges or levies imposed on it or on its income or
     profits or on any of its Property prior to the date on which penalties
     attach thereto, except for any such tax, assessment, charge or levy the
     payment of which is being contested in good faith and by proper proceedings
     and against which adequate reserves are being maintained; upon reasonable
     notice, permit representatives of the Administrative Agent or any Lender,
     during normal business hours, to examine, copy and make extracts from its
     books and records, to inspect its Properties, and to discuss its business
     and affairs with its officers, all to the extent reasonably requested by
     such Lender or the Administrative Agent (as the case may be); and keep, or
     cause to be kept, insured by financially sound and reputable insurers all
     Property of a character usually insured by Persons engaged in the same or
     similar business similarly situated against loss or damage of the kinds and
     in the amounts customarily insured against by such Persons and carry such
     other insurance as is usually carried by such Persons including, without
     limitation, environmental risk insurance to the extent reasonably
     available.  The Borrower shall promptly obtain endorsements to such
     insurance policies naming "BNP Paribas, as Administrative Agent for the
     Beneficiaries" as joint loss payee and containing provisions that such
     policies will not be canceled without 30 days prior written notice having
     been given by the insurance company to the Administrative Agent.

          (b) Proof of Insurance.  Contemporaneously with the delivery of the
     financial statements required by Section 8.01(a) to be delivered for each
     year, the Borrower will furnish or cause to be furnished to the
     Administrative Agent and the Lenders a certificate of insurance coverage
     from the insurer in form and substance satisfactory to the Administrative
     Agent and, if requested, will furnish the Administrative Agent and the
     Lenders copies of the applicable policies.

          (c) Oil and Gas Properties.  The Borrower will and will cause each
     Subsidiary to, at its own expense, do or cause to be done all things
     reasonably necessary to preserve and keep in good repair, working order and
     efficiency all Mortgaged Properties and all of its other material Oil and
     Gas Properties and other material Properties, including, without
     limitation, all material equipment, machinery and facilities, and from time
     to time will make all the reasonably necessary repairs, renewals and
     replacements so that at all times the state and condition of all Mortgaged
     Properties and all of its other material Oil and Gas Properties and other
     material Properties will be fully preserved and maintained,

                                       49
<PAGE>

     except to the extent a portion of such Properties is no longer capable of
     producing Hydrocarbons in economically reasonable amounts. The Borrower
     will and will cause each Subsidiary to promptly: (i) pay and discharge, or
     make reasonable and customary efforts to cause to be paid and discharged,
     all delay rentals, royalties, expenses and indebtedness accruing under the
     leases or other agreements affecting or pertaining to the Mortgaged
     Properties and all of its other material Oil and Gas Properties, (ii)
     perform or make reasonable and customary efforts to cause to be performed,
     in accordance with industry standards, the obligations required by each and
     all of the assignments, deeds, leases, sub-leases, contracts and agreements
     affecting its interests in its Oil and Gas Properties and other material
     Properties and (iii) do all other things necessary to keep unimpaired,
     except for Liens described in Section 9.02, its rights with respect to the
     Mortgaged Properties and all of its other material Oil and Gas Properties
     and other material Properties and prevent any forfeiture thereof or a
     default thereunder, except to the extent a portion of such Properties is no
     longer capable of producing Hydrocarbons in economically reasonable amounts
     and except for dispositions excluded by definition from Transfers. The
     Borrower will and will cause each Subsidiary to operate the Mortgaged
     Properties and all of its other material Oil and Gas Properties and other
     material Properties or cause or make reasonable and customary efforts to
     cause such Oil and Gas Properties and other material Properties to be
     operated in a careful and efficient manner in accordance with the practices
     of the industry and in compliance with all applicable contracts and
     agreements and in compliance in all material respects with all Governmental
     Requirements.

     Section 8.04 Environmental Matters.

          (a) Establishment of Procedures.  The Borrower will and will cause
     each Subsidiary to establish and implement such procedures as may be
     reasonably necessary to continuously determine and assure that any failure
     of the following does not have a Material Adverse Effect: (i) all Property
     of the Borrower and its Subsidiaries and the operations conducted thereon
     and other activities of the Borrower and its Subsidiaries are in compliance
     with and do not violate the requirements of any Environmental Laws, (ii) no
     oil, hazardous substances or solid wastes are disposed of or otherwise
     released on or to any Property owned by any such party except in compliance
     with Environmental Laws, (iii) no hazardous substance will be released on
     or to any such Property in a quantity equal to or exceeding that quantity
     which requires reporting pursuant to Section 103 of CERCLA, and (iv) no
     oil, oil and gas exploration and production wastes or hazardous substance
     is released on or to any such Property so as to pose an imminent and
     substantial endangerment to public health or welfare or the environment.

          (b) Notice of Action.  The Borrower will promptly notify the
     Administrative Agent and the Lenders in writing of any threatened action,
     investigation or inquiry by any Governmental Authority of which the
     Borrower has knowledge in connection with any Environmental Laws, excluding
     routine testing and corrective action.

          (c) Future Acquisitions.  The Borrower will and will cause each
     Subsidiary to provide environmental audits and tests, as reasonably
     requested by the Administrative Agent, in connection with any future
     acquisitions of Oil and Gas Properties or other material Properties.

                                       50
<PAGE>

     Section 8.05 Further Assurances. The Borrower will and will cause each
Subsidiary to cure promptly any defects in the creation and issuance of the
Notes and the execution and delivery of the Security Instruments and this
Agreement. The Borrower at its expense will and will cause each Subsidiary to
promptly execute and deliver to the Administrative Agent upon request all such
other documents, agreements and instruments to comply with or accomplish the
covenants and agreements of the Borrower or any Subsidiary, as the case may be,
in the Security Instruments and this Agreement, or to further evidence and more
fully describe the collateral intended as security for the Notes, or to correct
any omissions in the Security Instruments, or to state more fully the security
obligations set out herein or in any of the Security Instruments, or to perfect,
protect or preserve any Liens created pursuant to any of the Security
Instruments, or to make any recordings, to file any notices or obtain any
consents, all as may be necessary or appropriate in connection therewith.

     Section 8.06 Performance of Obligations. The Borrower will pay the Notes
according to the reading, tenor and effect thereof; and the Borrower will and
will cause each Subsidiary to do and perform every act and discharge all of the
obligations to be performed and discharged by them under the Security
Instruments and this Agreement, at the time or times and in the manner
specified.

     Section 8.07 Engineering Reports.

          (a) Not less than 60 days prior to each Scheduled Redetermination Date
     (other than the scheduled redetermination date to occur on or around July
     31, 2001), commencing with the Scheduled Redetermination Date to occur on
     or around October 1, 2001, the Borrower shall furnish to the Administrative
     Agent and the Lenders a Reserve Report.  Not less than 30 days prior to the
     Scheduled Redetermination Date to occur on or around July 31, 2001, the
     Borrower shall furnish to the Administrative Agent and the Lenders a
     Reserve Report dated as of July 1, 2001.  The January 1 Reserve Report of
     each year shall be prepared by Ryder Scott Company, S.A. Holditch &
     Associates, Inc., or other certified independent petroleum engineers or
     other independent petroleum consultant(s) reasonably acceptable to the
     Administrative Agent and the July 1 Reserve Report of each year and the
     Reserve Report for the July 31, 2001 redetermination shall be prepared by
     or under the supervision of the chief engineer of the Borrower who shall
     certify such Reserve Report to be true and accurate and to have been
     prepared in accordance with the procedures used in the immediately
     proceeding January 1 Reserve Report.

          (b) In the event of an unscheduled redetermination, the Borrower shall
     furnish to the Administrative Agent and the Lenders a Reserve Report
     prepared by or under the supervision of the chief engineer of the Borrower
     who shall certify such Reserve Report to be true and accurate and to have
     been prepared in accordance with the procedures used in the immediately
     preceding Reserve Report.  For any unscheduled redetermination requested by
     the Lenders or the Borrower pursuant to Section 2.08(d)), the Borrower
     shall provide such Reserve Report with an "as of" date as required by the
     Lenders as soon as possible, but in any event no later than 45 days
     following the receipt of the request by the Administrative Agent.

                                       51
<PAGE>

          (c) With the delivery of each Reserve Report, the Borrower shall
     provide to the Administrative Agent and the Lenders, a certificate from a
     Responsible Officer certifying that, to the best of his knowledge and in
     all material respects: (i) the information contained in the Reserve Report
     and any other information delivered in connection therewith is true and
     correct, (ii) the Borrower owns good and defensible title to the Oil and
     Gas Properties evaluated in such Reserve Report and such Properties are
     free of all Liens except for Liens permitted by Section 9.02, (iii) except
     as set forth on an exhibit to the certificate, on a net basis there are no
     gas imbalances, take or pay or other prepayments with respect to its Oil
     and Gas Properties evaluated in such Reserve Report which would require the
     Borrower to deliver Hydrocarbons produced from such Oil and Gas Properties
     at some future time without then or thereafter receiving full payment
     therefor, (iv) none of its Oil and Gas Properties have been sold since the
     date of the last Borrowing Base determination except as set forth on an
     exhibit to the certificate, which certificate shall list all of its Oil and
     Gas Properties sold and in such detail as reasonably required by the
     Majority Lenders, (v) attached to the certificate is a list of its Oil and
     Gas Properties added to and deleted from the immediately prior Reserve
     Report and a list showing any change in working interest or net revenue
     interest in its Oil and Gas Properties occurring and the reason for such
     change, (vi) attached to the certificate is a list of all Persons
     disbursing proceeds to the Borrower from its Oil and Gas Properties and
     (vii) except as set forth on a schedule attached to the certificate all of
     the Oil and Gas Properties evaluated by such Reserve Report are Mortgaged
     Property.

          (d) As soon as available and in any event within 30 days after the end
     of each calendar month, the Borrower shall furnish to the Administrative
     Agent production reports by lease for the Mortgaged Properties and its
     other material Oil and Gas Properties, which reports shall include
     quantities or volume of production which have accrued to the Borrower's
     accounts in such period, and such other information with respect thereto as
     the Administrative Agent may reasonably require.

     Section 8.08 Title Information.

          (a) Delivery.  On or before the delivery to the Administrative Agent
     and the Lenders of each Reserve Report required by Section 8.07(a), the
     Borrower will deliver title information in form and substance acceptable to
     the Administrative Agent covering enough of the Oil and Gas Properties
     evaluated by such Reserve Report that were not included in the immediately
     preceding Reserve Report, so that the Administrative Agent shall have
     received together with title information previously delivered to the
     Administrative Agent, satisfactory title information on at least ninety
     percent (90%) of the value of the Oil and Gas Properties evaluated by such
     Reserve Report.

          (b) Cure of Title Defects.  The Borrower shall cure any title defects
     or exceptions which are not Excepted Liens raised by such information, or
     substitute acceptable Mortgaged Properties with no title defects or
     exceptions except for Excepted Liens covering Mortgaged Properties of an
     equivalent value, within 45 days after a request by the Administrative
     Agent or the Lenders to cure such defects or exceptions.

          (c) Failure to Cure Title Defects.  If the Borrower is unable to cure
     any title defect requested by the Administrative Agent or the Lenders to be
     cured within the

                                       52
<PAGE>

     45 day period or the Borrower does not comply with the requirements to
     provide acceptable title information covering ninety percent (90%) of the
     value of the Oil and Gas Properties evaluated in the most recent Reserve
     Report, such default shall not be a Default or an Event of Default, but
     instead the Administrative Agent and the Lenders shall have the right to
     exercise the following remedy in their sole discretion from time to time,
     and any failure to so exercise this remedy at any time shall not be a
     waiver as to future exercise of the remedy by the Administrative Agent or
     the Lenders. To the extent that the Administrative Agent or the Lenders are
     not satisfied with title to any Mortgaged Property after the time period in
     Section 8.08(b) has elapsed, such unacceptable Mortgaged Property shall not
     count towards the ninety percent (90%) requirement, and the Administrative
     Agent may send a notice to the Borrower and the Lenders that the then
     outstanding Borrowing Base shall be reduced by an amount as determined by
     all of the Lenders to cause the Borrower to be in compliance with the
     requirement to provide acceptable title information on ninety percent (90%)
     of the value of the Oil and Gas Properties. This new Borrowing Base shall
     become effective immediately after receipt of such notice.

     Section 8.09 Collateral.

          (a) Collateral.  The Obligations shall be secured by a perfected first
     priority Lien (subject only to Liens permitted under Section 9.02 entitled
     to priority under applicable law or under Section 9.02) granted to the
     Administrative Agent for the benefit of the Beneficiaries in (i) the Oil
     and Gas Properties of the Borrower, whether now owned or hereafter
     acquired, pursuant to the terms of Security Instruments, and which compose
     at least ninety percent (90%) of the value of the Oil and Gas Properties
     described in the most recent Reserve Report, (ii) all of the accounts
     receivable, inventory, equipment, contract rights, general intangibles and
     other personal property of the Borrower (but expressly excluding office
     furniture, office fixtures and office equipment, other than seismic
     workstations) pursuant to terms of Security Instruments, (iii) the Oil and
     Gas Properties of ATP (UK), whether now owned or hereafter acquired,
     pursuant to the terms of Security Instruments and (iv) sixty-five percent
     (65%) of the stock of ATP (UK).

          (b) Lien in Acquired Oil and Gas Properties.  Should the Borrower or
     ATP (UK) acquire any additional Oil and Gas Properties or additional
     interests in its existing Oil and Gas Properties, the Borrower or APT (UK)
     will grant to the Administrative Agent as security for the Obligations a
     first-priority Lien (subject only to Excepted Liens and other liens
     permitted pursuant to Section 9.02) on the Borrower's or ATP (UK)'s, as
     applicable, interest in any Oil and Gas Properties not already subject to a
     Lien of the Security Instruments, which Lien will be created and perfected
     by and in accordance with the provisions of mortgages, deeds of trust,
     security agreements and financing statements, or other Security
     Instruments, all in form and substance satisfactory to the Administrative
     Agent in its sole discretion and in sufficient executed (and acknowledged
     where necessary or appropriate) counterparts for recording purposes.  In
     connection with any such creation of a Lien against future-acquired Oil and
     Gas Properties, should the Borrower so request and without constituting an
     unscheduled redetermination of the Borrowing Base pursuant to Section
     2.08(d), the Administrative Agent and the Lenders

                                       53
<PAGE>

     shall redetermine the Borrowing Base and the Monthly Reduction Amount, on
     the basis of information regarding such acquired Oil and Gas Properties and
     any other information reasonably requested by the Administrative Agent, but
     without obligation on the part of the Borrower to provide a Reserve Report.
     Upon each such request for such a Borrowing Base redetermination, the
     Borrower shall pay an engineering fee to the Administrative Agent, for its
     own account, of $10,000.

          (c) Title Information.  Concurrently with the granting of the Lien or
     other action referred to in Section 8.07(a) above, the Borrower will
     provide to the Administrative Agent title information in form and substance
     reasonably satisfactory to the Administrative Agent with respect to the
     Borrower's interests in such Oil and Gas Properties.

          (d) Legal Opinions.  Also, promptly after the filing of any new
     Security Instrument in any state, upon the reasonable request of the
     Administrative Agent, the Borrower will provide to the Administrative Agent
     an opinion addressed to the Administrative Agent for the benefit of the
     Lenders in form and substance reasonably satisfactory to the Administrative
     Agent from counsel acceptable to Administrative Agent, stating that the
     Security Instrument is valid, binding and enforceable in accordance with
     its terms in legally sufficient form for such jurisdiction, and the means
     by which such Security Instrument will perfect the Lien created thereby.

     Section 8.10  ERISA Information and Compliance.  The Borrower will promptly
furnish and will cause the Subsidiaries and any ERISA Affiliate to promptly
furnish to the Administrative Agent with sufficient copies to the Lenders (i)
promptly after the filing thereof with the United States Secretary of Labor, the
Internal Revenue Service or the PBGC, copies of each annual and other report
with respect to each Plan or any trust created thereunder, (ii) immediately upon
becoming aware of the occurrence of any ERISA Event or of any "prohibited
transaction," as described in section 406 of ERISA or in section 4975 of the
Code, in connection with any Plan or any trust created thereunder, a written
notice signed by a Responsible Officer specifying the nature thereof, what
action the Borrower, the Subsidiary or the ERISA Affiliate is taking or proposes
to take with respect thereto, and, when known, any action taken or proposed by
the Internal Revenue Service, the Department of Labor or the PBGC with respect
thereto, and (iii) immediately upon receipt thereof, copies of any notice of the
PBGC's intention to terminate or to have a trustee appointed to administer any
Plan.  With respect to each Plan (other than a Multiemployer Plan), the Borrower
will, and will cause each Subsidiary and ERISA Affiliate to, (i) satisfy in full
and in a timely manner, without incurring any late payment or underpayment
charge or penalty and without giving rise to any lien, all of the contribution
and funding requirements of section 412 of the Code (determined without regard
to subsections (d), (e), (f) and (k) thereof) and of section 302 of ERISA
(determined without regard to sections 303, 304 and 306 of ERISA), and (ii) pay,
or cause to be paid, to the PBGC in a timely manner, without incurring any late
payment or underpayment charge or penalty, all premiums required pursuant to
sections 4006 and 4007 of ERISA.

     Section 8.11  Post-Closing Matters.

          (a) Promptly after the Closing Date, but in any event within 45 days
     after the Closing Date, the Borrower shall have caused ATP (UK) to have (i)
     executed and

                                       54
<PAGE>

     delivered in favor of the Administration Agent fixed and floating charges
     on all of the Oil and Gas Properties of ATP (UK) located in the North Sea
     to secure the Obligations, (ii) taken all action necessary to obtain all
     necessary consents and approvals from all necessary Persons and
     Governmental Authorities and to duly register such fixed and floating
     charges, (iii) obtained and delivered certificates of the appropriate
     Governmental Authorities with respect to the existence, qualification and
     good standing (or the functional equivalent under English law) of ATP (UK),
     and (iv) caused to be delivered an opinion from counsel to ATP (UK), in
     form and substance satisfactory to the Administrative Agent, as to such
     matters incident to the transactions herein contemplated relating to ATP
     (UK) as the Administrative Agent may reasonably request.

          (b) Concurrent with delivery of the fixed and floating charges
     described in Section 18.11(a), the Borrower shall cause ATP (UK) to execute
     and deliver a certificate of the Secretary or an Assistant Secretary of ATP
     (UK) setting forth (i) resolutions of its board of directors with respect
     to the authorization of ATP (UK) to execute and deliver the Loan Documents
     to which it is a party and to enter into the transactions contemplated in
     those documents, (ii) the officers of ATP (UK) (y) who are authorized to
     sign the Loan Documents to which ATP (UK) is a party and (z) who will,
     until replaced by another officer or officers duly authorized for that
     purpose, act as its representative for the purposes of signing documents
     and giving notices and other communications in connection with this
     Agreement and the transactions contemplated hereby, (iii) specimen
     signatures of the authorized officers, and (iv) the memorandum and articles
     of association, the certificate of incorporation, certificate of
     incorporation on change of name and bylaws of ATP (UK), certified as being
     true and complete.  The Administrative Agent and the Lenders may
     conclusively rely on such certificate until they receive notice in writing
     from ATP (UK) to the contrary.

                                  ARTICLE IX

                               NEGATIVE COVENANTS

     The Borrower covenants and agrees that, so long as any of the Commitments
are in effect and until payment in full of Loans hereunder, all interest thereon
and all other amounts payable by the Borrower hereunder, without the prior
written consent of the Majority Lenders:

     Section 9.01 Debt. Neither the Borrower nor any Subsidiary will incur,
create, assume or permit to exist any Debt, except:

          (a) the Notes or other Obligations or any guaranty of or suretyship
     arrangement for the Notes or other Obligations;

          (b) Debt of the Borrower existing on the Closing Date which is
     disclosed in Schedule 9.01, and any renewals or extensions (but not
     increases) thereof;

          (c) accounts payable (for the deferred purchase price of Property or
     services) from time to time incurred in the ordinary course of business
     which, if greater than 90

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<PAGE>

     days past the invoice or billing date, are being contested in good faith by
     appropriate proceedings if reserves adequate under GAAP shall have been
     established therefor;

          (d) Debt under capital leases (as required to be reported on the
     financial statements of the Borrower pursuant to GAAP) not to exceed
     $100,000.

          (e) Debt associated with bonds or surety obligations required by
     Governmental Requirements in connection with the operation of the Oil and
     Gas Properties;

          (f)  The Senior Unsecured Debt;

          (g) Debt of the Borrower under Hedging Agreements with the
     Administrative Agent or other counterparties, as approved by the Majority
     Lenders (such approval not to be unreasonably withheld), entered into as a
     part of its normal business operations as a risk management strategy and/or
     hedge against changes resulting from market conditions related to the
     Borrower's operations; provided, however, such Hedging Agreement shall not
     obligate the Borrower to any margin call requirements; and

          (h) Debt consisting of sureties or bonds provided to any Governmental
     Authority or other Person and assuring payment of contingent liabilities of
     the Borrower or ATP (UK) with respect to plugging, facility removal and
     abandonment of its Oil and Gas Properties.

     Section 9.02 Liens. Neither the Borrower nor any Subsidiary will create,
incur, assume or permit to exist any Lien on any of its Properties (now owned or
hereafter acquired), except:

          (a) Liens securing the payment of any Obligations;

          (b)  Excepted Liens;

          (c) Liens securing leases allowed under Section 9.01(d), but only on
     the Property under lease;

          (d) Liens disclosed on Schedule 9.02; and

          (e) Liens on cash or securities of the Borrower securing the Debt
     described in Section 9.01(e).

     Section 9.03 Investments, Loans and Advances. Neither the Borrower nor any
Subsidiary will make or permit to remain outstanding any loans or advances to or
investments in any Person, except that the foregoing restriction shall not apply
to:

          (a) investments, loans or advances reflected in the Financial
     Statements or which are disclosed to the Lenders in Schedule 9.03;

          (b) accounts receivable arising in the ordinary course of business;

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<PAGE>

          (c) direct obligations of the United States or any agency thereof, or
     obligations guaranteed by the United States or any agency thereof, in each
     case maturing within one year from the date of creation thereof;

          (d) commercial paper maturing within one year from the date of
     creation thereof rated in the highest grade by Standard & Poor's
     Corporation or Moody's Investors Service, Inc.;

          (e) deposits maturing within one year from the date of creation
     thereof with, including certificates of deposit issued by, any Lender or
     any office located in the United States of any other bank or trust company
     which is organized under the laws of the United States or any state
     thereof, has capital, surplus and undivided profits aggregating at least
     $500,000,000 (as of the date of such Lender's or bank or trust company's
     most recent financial reports) and has a short term deposit rating of no
     lower than A2 or P2, as such rating is set forth from time to time, by
     Standard & Poor's Corporation or Moody's Investors Service, Inc.,
     respectively;

          (f) deposits in money market funds investing exclusively in
     investments described in Section 9.03(c), 9.03(d) or 9.03(e);

          (g) investments, loans or advances made by the Borrower in or to ATP
     (UK) as reflected on Schedule 9.03 and additional investments, loans or
     advances made by the Borrower in or to ATP (UK), not to exceed at any one
     time outstanding in the aggregate the amount of any notes issued by ATP
     (UK) payable to the order of the Borrower and collaterally assigned to, and
     held in the possession of, the Administrative Agent;

          (h) other investments, loans or advances not to exceed $250,000 in the
     aggregate at any time; and

          (i) investments by the Borrower in direct ownership interests in
     additional Oil and Gas Properties and gas gathering systems related
     thereto.

     Section 9.04 Dividends, Distributions and Redemptions. The Borrower will
not declare or pay any dividend, purchase, redeem (except for redemption of
stock options held by employees, as provided in the 1998 and 2000 stock option
plans of the Borrower; provided, however, from and after the Closing Date, the
amount of stock so redeemed and held by the Company shall not exceed at any one
time in the aggregate more than the number of shares that when multiplied by the
then current price of the stock exceeds $500,000) or otherwise acquire for value
any of its stock now or hereafter outstanding, return any capital to its
stockholders or make any distribution of its assets to its stockholders.

     Section 9.05 Sales and Leasebacks. Neither the Borrower nor any Subsidiary
will enter into any arrangement, directly or indirectly, with any Person whereby
the Borrower or any Subsidiary shall sell or transfer any of its material
Property, whether now owned or hereafter acquired, and whereby the Borrower or
any Subsidiary shall then or thereafter rent or lease as lessee such Property or
any part thereof or other Property which the Borrower or any Subsidiary intends
to use for substantially the same purpose or purposes as the Property sold or
transferred.

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<PAGE>

     Section 9.06 Nature of Business. Neither the Borrower nor any Subsidiary
will allow any material change to be made in the character of its business as an
independent oil and gas exploration and production company, nor will the
Borrower or any Subsidiary operate or carry on business in any jurisdiction
other than the United States, including the Gulf of Mexico, or the United
Kingdom North Sea.

     Section 9.07 Limitation on Leases. Neither the Borrower nor any Subsidiary
will create, incur, assume or permit to exist any obligation for the payment of
rent or hire of Property of any kind whatsoever (real or personal including
capital leases, but excluding leases of Hydrocarbon Interests), under leases or
lease agreements which would cause the aggregate amount of all payments made by
the Borrower and its Subsidiaries pursuant to all such leases or lease
agreements to exceed $250,000 in any period of twelve consecutive calendar
months during the life of such leases.

     Section 9.08 Mergers, Etc. Neither the Borrower nor any Subsidiary will
merge into or with or consolidate with any other Person, or sell, lease or
otherwise dispose of (whether in one transaction or in a series of transactions)
all or substantially all of its Property or assets to any other Person, except
that the foregoing restriction shall not apply to the merger of any Subsidiary
into the Borrower or another Subsidiary.

     Section 9.09 Proceeds of Notes; Letters of Credit. The Borrower will not
permit the proceeds of the Notes or Letters of Credit to be used for any purpose
other than those permitted by Section 7.07. Neither the Borrower nor any Person
acting on behalf of the Borrower has taken or will take any action which might
cause any of the Loan Documents to violate Regulation T, U or X or any other
regulation of the Board of Governors of the Federal Reserve System or to violate
Section 7 of the Securities Exchange Act of 1934 or any rule or regulation
thereunder, in each case as now in effect or as the same may hereinafter be in
effect.

     Section 9.10 ERISA Compliance. The Borrower will not at any time:

          (a) Engage in, or permit any Subsidiary or ERISA Affiliate to engage
     in, any transaction in connection with which the Borrower, any Subsidiary
     or any ERISA Affiliate could be subjected to either a civil penalty
     assessed pursuant to section 502(c), (i) or (l) of ERISA or a tax imposed
     by Chapter 43 of Subtitle D of the Code;

          (b) Terminate, or permit any Subsidiary or ERISA Affiliate to
     terminate, any Plan in a manner, or take any other action with respect to
     any Plan, which could result in any liability to the Borrower, any
     Subsidiary or any ERISA Affiliate to the PBGC;

          (c) Fail to make, or permit any Subsidiary or ERISA Affiliate to fail
     to make, full payment when due of all amounts which, under the provisions
     of any Plan, agreement relating thereto or applicable law, the Borrower, a
     Subsidiary or any ERISA Affiliate is required to pay as contributions
     thereto;

          (d) Permit to exist, or allow any Subsidiary or ERISA Affiliate to
     permit to exist, any accumulated funding deficiency within the meaning of
     Section 302 of ERISA or section 412 of the Code, whether or not waived,
     with respect to any Plan;

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<PAGE>

          (e) Permit, or allow any Subsidiary or ERISA Affiliate to permit, the
     actuarial present value of the benefit liabilities under any Plan
     maintained by the Borrower, any Subsidiary or any ERISA Affiliate which is
     regulated under Title IV of ERISA to exceed the current value of the assets
     (computed on a plan termination basis in accordance with Title IV of ERISA)
     of such Plan allocable to such benefit liabilities.  The term "actuarial
     present value of the benefit liabilities" shall have the meaning specified
     in section 4041 of ERISA;

          (f) Contribute to or assume an obligation to contribute to, or permit
     any Subsidiary or ERISA Affiliate to contribute to or assume an obligation
     to contribute to, any Multiemployer Plan;

          (g) Acquire, or permit any Subsidiary or ERISA Affiliate to acquire,
     an interest in any Person that causes such Person to become an ERISA
     Affiliate with respect to the Borrower, any Subsidiary or any ERISA
     Affiliate if such Person sponsors, maintains or contributes to, or at any
     time in the six-year period preceding such acquisition has sponsored,
     maintained, or contributed to, (1) any Multiemployer Plan, or (2) any other
     Plan that is subject to Title IV of ERISA under which the actuarial present
     value of the benefit liabilities under such Plan exceeds the current value
     of the assets (computed on a plan termination basis in accordance with
     Title IV of ERISA) of such Plan allocable to such benefit liabilities;

          (h) Incur, or permit any Subsidiary or ERISA Affiliate to incur, a
     liability to or on account of a Plan under sections 515, 4062, 4063, 4064,
     4201 or 4204 of ERISA;

          (i) Contribute to or assume an obligation to contribute to, or permit
     any Subsidiary or ERISA Affiliate to contribute to or assume an obligation
     to contribute to, any employee welfare benefit plan, as defined in section
     3(1) of ERISA, including, without limitation, any such plan maintained to
     provide benefits to former employees of such entities, that may not be
     terminated by such entities in their sole discretion at any time without
     any material liability; or

          (j) Amend or permit any Subsidiary or ERISA Affiliate to amend, a Plan
     resulting in an increase in current liability such that the Borrower, any
     Subsidiary or any ERISA Affiliate is required to provide security to such
     Plan under section 401(a)(29) of the Code.

     Section 9.11 Sale or Discount of Receivables. Neither the Borrower nor any
Subsidiary will discount or sell (with or without recourse) any of its notes
receivable or accounts receivable.

     Section 9.12 Capital Expenditures. The Borrower will not make any
expenditures for fixed or capital assets not directly associated with the
drilling and development of Oil and Gas Properties if, after giving effect
thereto, the aggregate of all such expenditures would exceed $250,000 during any
fiscal year.

     Section 9.13 Current Ratio. The Borrower will not permit its ratio of (i)
consolidated current assets to (ii) consolidated current liabilities (excluding
current maturities of the Notes) to be less than 1.0 to 1.0 at the end of any
fiscal quarter of the Borrower.

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<PAGE>

     Section 9.14 Debt Coverage Ratio. The Borrower will not permit its Debt
Ratio as of the end of any fiscal quarter of the Borrower (calculated quarterly
at the end of each fiscal quarter) to be less than 3.0 to 1.0. For purposes of
the calculations in this Section 9.14 to be made prior to the first fiscal
quarter of 2002, EBITDA shall be determined by multiplying the sum of EBITDA for
each of the fiscal quarters actually elapsed from and including the first fiscal
quarter of 2001 through and including the fourth fiscal quarter of 2001 by a
fraction, the numerator of which is 4 and the denominator of which is the number
of such actually elapsed fiscal quarters.

     Section 9.15 Interest Coverage Ratio. The Borrower will not permit its
Interest Coverage Ratio as of the end of any fiscal quarter of the Borrower
(calculated quarterly at the end of each fiscal quarter) to be less than 3.0 to
1.0.

     Section 9.16 Sale of Oil and Gas Properties. The Borrower will not, and
will not permit any Subsidiary to, Transfer any Mortgaged Property or other
material Oil and Gas Property or any interest in any Mortgaged Property or other
material Oil and Gas Property.

     Section 9.17 Environmental Matters. Neither the Borrower nor any Subsidiary
will cause or permit any of its Property to be in violation of, or do anything
or permit anything to be done which will subject any such Property to any
remedial obligations under any Environmental Laws, assuming disclosure to the
applicable Governmental Authority of all relevant facts, conditions and
circumstances, if any, pertaining to such Property where such violations or
remedial obligations would have a Material Adverse Effect.

     Section 9.18 Transactions with Affiliates. Neither the Borrower nor any
Subsidiary will enter into any transaction, including, without limitation, any
purchase, sale, lease or exchange of Property or the rendering of any service,
with any Affiliate unless such transactions are otherwise permitted under this
Agreement, are in the ordinary course of its business and are upon fair and
reasonable terms no less favorable to it than it would obtain in a comparable
arm's length transaction with a Person not an Affiliate.

     Section 9.19 Subsidiaries. Except as permitted by Section 9.03, the
Borrower shall not, and shall not permit any Subsidiary to, create any
additional Subsidiaries. The Borrower shall not and shall not permit any
Subsidiary to sell or to issue any stock or ownership interest of a Subsidiary,
except to the Borrower or another Subsidiary and except in compliance with
Section 9.03.

     Section 9.20 Negative Pledge Agreements. Neither the Borrower nor any
Subsidiary will create, incur, assume or permit to exist any contract, agreement
or understanding (other than this Agreement and the Security Instruments) which
in any way prohibits or restricts the granting, conveying, creation or
imposition of any Lien on any of its Property to secure the Obligations or
restricts any Subsidiary from paying dividends to the Borrower, or which
requires the consent of or notice to other Persons in connection therewith.

     Section 9.21 Gas Imbalances, Take-or-Pay or Other Prepayments. The Borrower
will not allow gas imbalances, take-or-pay or other prepayments with respect to
the Oil and Gas Properties of the Borrower or any Subsidiary which would require
the Borrower or any Subsidiary to deliver in the aggregate two percent (2%) or
more of their respective Hydrocarbons

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<PAGE>

produced on a monthly basis from such Oil and Gas Properties at some future time
without then or thereafter receiving full payment therefor.

     Section 9.22  Senior Unsecured Notes.

          (a) Guaranties. The obligations, liabilities and indebtedness created
     under or evidenced by the Senior Unsecured Notes and any other documents
     executed in connection therewith shall not be guaranteed (whether a
     guaranty of payment, collection or otherwise) by any Subsidiary of the
     Borrower, unless such guaranty results from a guaranty of the Obligations
     in favor of the Administrative Agent.

          (b) Payment and Modification. The Borrower shall not redeem or
     repurchase, nor shall the Borrower or any Subsidiary make any payments of
     principal on the Senior Unsecured Notes, prior to stated maturity. Further,
     the Borrower shall not amend, supplement, restate or otherwise modify, in
     any material respect, the Senior Unsecured Notes or any other document
     executed in connection therewith without the prior written consent of the
     Majority Lenders.

                                   ARTICLE X

                          EVENTS OF DEFAULT; REMEDIES

     Section 10.01 Events of Default. One or more of the following events shall
constitute an "Event of Default":

          (a) the Borrower shall default in the payment or prepayment when due
     of any principal of or interest on any Loan, or any reimbursement
     obligation for a disbursement made under any Letter of Credit, or any fees
     or other amount payable by it hereunder or under any Security Instrument;
     or

          (b) the Borrower or any Subsidiary shall default in the payment when
     due of any principal of or interest on any of its other Debt aggregating
     $250,000 or more, or any event specified in any note, agreement, indenture
     or other document evidencing or relating to any such Debt shall occur if
     the effect of such event is to cause, or (with the giving of any notice or
     the lapse of time or both) to permit the holder or holders of such Debt (or
     a trustee or agent on behalf of such holder or holders) to cause, such Debt
     to become due prior to its stated maturity; or

          (c) any representation, warranty or certification made or deemed made
     herein or in any Security Instrument by the Borrower or any Subsidiary, or
     any certificate furnished to any Lender or the Administrative Agent
     pursuant to the provisions hereof or any Security Instrument, shall prove
     to have been false or misleading in any material respect as of the time
     made or furnished; or

          (d) the Borrower shall default in the performance of any of its
     obligations under Article IX, Section 8.01(c)  or any other Article of this
     Agreement other than under Article VIII (excluding Section 8.01(c)); or the
     Borrower shall default in the performance of any of its obligations under
     Article VIII or any Security Instrument (other than the

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<PAGE>

     payment of amounts due which shall be governed by Section 10.01(a)) and
     such default shall continue unremedied for a period of 30 days after the
     earlier to occur of (i) notice thereof to the Borrower by the
     Administrative Agent or any Lender (through the Administrative Agent), or
     (ii) the Borrower otherwise becoming aware of such default; or ATP (UK)
     shall default in the performance of any of its obligations under any Loan
     Document to which it is a party (other than the payment of amounts due
     which shall be governed by 10.01(a)) and such default shall continue
     unremedied for a period of 30 days after the earlier to occur of (i) notice
     thereof to the Borrower by the Administrative Agent or any Lender (through
     the Administrative Agent), or (ii) the Borrower or ATP (UK) otherwise
     becoming aware of such default; or

          (e) the Borrower shall admit in writing its inability to, or be
     generally unable to, pay its debts as such debts become due; or

          (f) the Borrower shall (i) apply for or consent to the appointment of,
     or the taking of possession by, a receiver, custodian, trustee or
     liquidator of itself or of all or a substantial part of its property, (ii)
     make a general assignment for the benefit of its creditors, (iii) commence
     a voluntary case under the Federal Bankruptcy Code (as now or hereafter in
     effect), (iv) file a petition seeking to take advantage of any other law
     relating to bankruptcy, insolvency, reorganization, winding-up, liquidation
     or composition or readjustment of debts, (v) fail to controvert in a timely
     and appropriate manner, or acquiesce in writing to, any petition filed
     against it in an involuntary case under the United States Bankruptcy Code,
     or (vi) take any corporate action for the purpose of effecting any of the
     foregoing; or

          (g) a proceeding or case shall be commenced, without the application
     or consent of the Borrower, in any court of competent jurisdiction, seeking
     (i) its liquidation, reorganization, dissolution or winding-up, or the
     composition or readjustment of its debts, (ii) the appointment of a
     trustee, receiver, custodian, liquidator or the like of the Borrower of all
     or any substantial part of its assets, or (iii) similar relief in respect
     of the Borrower under any law relating to bankruptcy, insolvency,
     reorganization, winding-up, or composition or adjustment of debts, and any
     such proceeding or case shall continue undismissed, or an order, judgment
     or decree approving or ordering any of the foregoing shall be entered and
     continue unstayed and in effect, for a period of 60 days; or (iv) an order
     for relief against the Borrower shall be entered in an involuntary case
     under the United States Bankruptcy Code; or

          (h) a judgment or judgments for the payment of money in excess of
     $500,000 in the aggregate and not covered by insurance shall be rendered by
     a court against the Borrower or any Subsidiary and the same shall not be
     discharged (or provision shall not be made for such discharge), or a stay
     of execution thereof shall not be procured, within 30 days from the date of
     entry thereof and the Borrower or such Subsidiary shall not, within said
     period of 30 days, or such longer period during which execution of the same
     shall have been stayed, appeal therefrom and cause the execution thereof to
     be stayed during such appeal; or

          (i) the Security Instruments after delivery thereof shall for any
     reason, except to the extent permitted by the terms thereof, cease to be in
     full force and effect and valid,

                                       62
<PAGE>

     binding and enforceable in accordance with their terms, or cease to create
     a valid and perfected Lien of the priority required thereby on any of the
     collateral purported to be covered thereby, except to the extent permitted
     by the terms of this Agreement, or the Borrower shall so state in writing;
     or

          (j) an event having a Material Adverse Effect shall occur; or

          (k) the Borrower discontinues its usual business or a Change of
     Control occurs; or

          (l) ATP (UK) takes, suffers or permits to exist any of the events or
     conditions referred to in paragraphs (e), (f) or (g) or if any provision of
     any Loan Document to which it is a party shall for any reason cease to be
     valid and binding on ATP (UK) or if ATP (UK) shall so state in writing; or

          (m) the occurrence of the loss, theft, substantial damage to or
     destruction of a material portion of the collateral the subject of any
     Security Instrument not fully covered by insurance, except for deductibles
     and allowing for the depreciated value of such collateral.

     Section 10.02 Remedies.

          (a) In the case of an Event of Default other than one referred to in
     clauses (e), (f) or (g) of Section 10.01 or in clause (c) to the extent it
     relates to clauses (e), (f) or (g), the Administrative Agent, upon request
     of the Majority Lenders, shall, by notice to the Borrower, cancel the
     Commitments (in whole or part) and/or declare the principal amount then
     outstanding of, and the accrued interest on, the Loans and all other
     amounts payable by the Borrower hereunder and under the Notes (including
     without limitation the payment of cash collateral to secure the LC Exposure
     as provided in Section 2.10(b)) to be forthwith due and payable, whereupon
     such amounts shall be immediately due and payable without presentment,
     demand, protest, notice of intent to accelerate, notice of acceleration or
     other formalities of any kind, all of which are hereby expressly waived by
     the Borrower.

          (b) In the case of the occurrence of an Event of Default referred to
     in clauses (e), (f) or (g) of Section 10.01 or in clause (c) to the extent
     it relates to clauses (e), (f) or (g), the Commitments shall be
     automatically canceled and the principal amount then outstanding of, and
     the accrued interest on, the Loans and all other amounts payable by the
     Borrower hereunder and under the Notes (including without limitation the
     payment of cash collateral to secure the LC Exposure as provided in Section
     2.10(b)) shall become automatically immediately due and payable without
     presentment, demand, protest, notice of intent to accelerate, notice of
     acceleration or other formalities of any kind, all of which are hereby
     expressly waived by the Borrower.

          (c) All proceeds received after maturity of the Notes, whether by
     acceleration or otherwise shall be applied first to reimbursement of
     expenses and indemnities provided for in this Agreement and the Security
     Instruments; second to accrued interest on the Notes; third to fees; fourth
     pro rata to principal outstanding on the Notes and any other

                                       63
<PAGE>

     Obligations; fifth to serve as cash collateral to be held by the
     Administrative Agent to secure the LC Exposure; and any excess shall be
     paid to the Borrower or as otherwise required by any Governmental
     Requirement.

                                  ARTICLE XI

                            THE ADMINISTRATIVE AGENT

     Section 11.01  Appointment, Powers and Immunities.  Each Lender hereby
irrevocably appoints and authorizes the Administrative Agent to act as its agent
hereunder and  under the Security Instruments with such powers as are
specifically delegated to the Administrative Agent by the terms of this
Agreement and the Security Instruments, together with such other powers as are
reasonably incidental thereto.  The Administrative Agent (which term as used in
this sentence and in Section 11.05 and the first sentence of Section 11.06 shall
include reference to its Affiliates and its and its Affiliates' officers,
directors, employees, attorneys, accountants, experts and agents):  (i) shall
have no duties or responsibilities except those expressly set forth in the Loan
Documents, and shall not by reason of the Loan Documents be a trustee or
fiduciary for any Lender; (ii) makes no representation or warranty to any Lender
and shall not be responsible to the Lenders for any recitals, statements,
representations or warranties contained in this Agreement, or in any certificate
or other document referred to or provided for in, or received by any of them
under, this Agreement, or for the value, validity, effectiveness, genuineness,
execution, effectiveness, legality, enforceability or sufficiency of this
Agreement, any Note or any other document referred to or provided for herein or
for any failure by the Borrower or any other Person (other than the
Administrative Agent) to perform any of its obligations hereunder or thereunder
or for the existence, value, perfection or priority of any collateral security
or the financial or other condition of the Borrower, its Subsidiaries or any
other obligor or guarantor; (iii) except pursuant to Section 11.07 shall not be
required to initiate or conduct any litigation or collection proceedings
hereunder; and (iv) shall not be responsible for any action taken or omitted to
be taken by it hereunder or under any other document or instrument referred to
or provided for herein or in connection herewith including its own ordinary
negligence, except for its own gross negligence or willful misconduct.  The
Administrative Agent may employ agents, accountants, attorneys and experts and
shall not be responsible for the negligence or misconduct of any such agents,
accountants, attorneys or experts selected by it in good faith or any action
taken or omitted to be taken in good faith by it in accordance with the advice
of such agents, accountants, attorneys or experts.  The Administrative Agent may
deem and treat the payee of any Note as the holder thereof for all purposes
hereof unless and until a written notice of the assignment or transfer thereof
permitted hereunder shall have been filed with the Administrative Agent.  The
Administrative Agent is authorized to release any collateral that is permitted
to be sold or released pursuant to the terms of the Loan Documents.

     Section 11.02 Reliance by Administrative Agent. The Administrative Agent
shall be entitled to rely upon any certification, notice or other communication
(including any thereof by telephone, telex, telecopier, telegram or cable)
believed by it to be genuine and correct and to have been signed or sent by or
on behalf of the proper Person or Persons, and upon advice and statements of
legal counsel, independent accountants and other experts selected by the
Administrative Agent.

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<PAGE>

     Section 11.03 Defaults. The Administrative Agent shall not be deemed to
have knowledge of the occurrence of a Default (other than the non-payment of
principal of or interest on Loans or of fees or failure to reimburse for Letter
of Credit drawings) unless the Administrative Agent has received notice from a
Lender or the Borrower specifying such Default and stating that such notice is a
"Notice of Default." In the event that the Administrative Agent receives such a
notice of the occurrence of a Default, the Administrative Agent shall give
prompt notice thereof to the Lenders. In the event of a payment Default, the
Administrative Agent shall give each Lender prompt notice of each such payment
Default.

     Section 11.04 Rights as a Lender. With respect to its Commitments and the
Loans made by it and its participation in the issuance of Letters of Credit,
Paribas (and any successor acting as Administrative Agent) in its capacity as a
Lender hereunder shall have the same rights and powers hereunder as any other
Lender and may exercise the same as though it were not acting as the
Administrative Agent, and the term "Lender" or "Lenders" shall, unless the
context otherwise indicates, include the Administrative Agent in its individual
capacity. Paribas (and any successor acting as Administrative Agent) and its
Affiliates may (without having to account therefor to any Lender) accept
deposits from, lend money to and generally engage in any kind of banking, trust
or other business with the Borrower (and any of its Affiliates) as if it were
not acting as the Administrative Agent, and Paribas and its Affiliates may
accept fees and other consideration from the Borrower for services in connection
with this Agreement or otherwise without having to account for the same to the
Lenders.

     Section 11.05 Indemnification. The Lenders agree to indemnify the
Administrative Agent and the Issuing Bank ratably in accordance with their
Percentage Shares for the Indemnity Matters as described in section 12.03 to the
extent not indemnified or reimbursed by the Borrower under section 12.03, but
without limiting the obligations of the Borrower under said section 12.03 and
for any and all other liabilities, obligations, losses, damages, penalties,
actions, judgments, suits, costs, expenses or disbursements of any kind and
nature whatsoever which may be imposed on, incurred by or asserted against the
Administrative Agent or the Issuing Bank in any way relating to or arising out
of: (i) this Agreement, the Security Instruments or any other documents
contemplated by or referred to herein or the transactions contemplated hereby,
but excluding, unless a Default has occurred and is continuing, normal
administrative costs and expenses incident to the performance of its agency
duties hereunder or (ii) the enforcement of any of the terms of this Agreement,
any Security Instrument or of any such other documents; whether or not any of
the foregoing specified in this section 11.05 arises from the sole or concurrent
negligence of the Administrative Agent or the Issuing Bank, provided that no
Lender shall be liable for any of the foregoing to the extent they arise from
the gross negligence or willful misconduct of the Administrative Agent.

     Section 11.06 Non-Reliance on Administrative Agent and other Lenders. Each
Lender acknowledges and agrees that it has, independently and without reliance
on the Administrative Agent or any other Lender, and based on such documents and
information as it has deemed appropriate, made its own credit analysis of the
Borrower and its decision to enter into this Agreement, and that it will,
independently and without reliance upon the Administrative Agent or any other
Lender, and based on such documents and information as it shall deem appropriate
at the time, continue to make its own analysis and decisions in taking or not
taking action under this Agreement. The Administrative Agent shall not be
required to keep itself informed as to the

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performance or observance by the Borrower of this Agreement, the Notes, the
Security Instruments or any other document referred to or provided for herein or
to inspect the properties or books of the Borrower. Except for notices, reports
and other documents and information expressly required to be furnished to the
Lenders by the Administrative Agent hereunder, the Administrative Agent shall
not have any duty or responsibility to provide any Lender with any credit or
other information concerning the affairs, financial condition or business of the
Borrower (or any of its Affiliates) which may come into the possession of the
Administrative Agent or any of its Affiliates. In this regard, each Lender
acknowledges that Winstead Sechrest & Minick P.C. is acting in this transaction
as special counsel to the Administrative Agent only, except to the extent
otherwise expressly stated in any legal opinion or any Loan Document. Each
Lender will consult with its own legal counsel to the extent that it deems
necessary in connection with the Loan Documents and the matters contemplated
therein.

     Section 11.07  Action by Administrative Agent.  Except for action or other
matters expressly required of the Administrative Agent hereunder, the
Administrative Agent shall in all cases be fully justified in failing or
refusing to act hereunder unless it shall (i) receive written instructions from
the Majority Lenders (or all of the Lenders as expressly required by Section
12.04) specifying the action to be taken, and (ii) be indemnified to its
satisfaction by the Lenders against any and all liability and expenses which may
be incurred by it by reason of taking or continuing to take any such action.
The instructions of the Majority Lenders (or all of the Lenders as expressly
required by Section 12.04) and any action taken or failure to act pursuant
thereto by the Administrative Agent shall be binding on all of the Lenders.  If
a Default has occurred and is continuing, the Administrative Agent shall take
such action with respect to such Default as shall be directed by the Majority
Lenders (or all of the Lenders as required by Section 12.04) in the written
instructions (with indemnities) described in this Section 11.07, provided that,
unless and until the Administrative Agent shall have received such directions,
the Administrative Agent may (but shall not be obligated to) take such action,
or refrain from taking such action, with respect to such Default as it shall
deem advisable in the best interests of the Lenders.  In no event, however,
shall the Administrative Agent be required to take any action which exposes the
Administrative Agent to personal liability or which is contrary to this
Agreement and the Security Instruments or applicable law.

     Section 11.08 Resignation or Removal of Administrative Agent. Subject to
the appointment and acceptance of a successor Administrative Agent as provided
below, the Administrative Agent may resign at any time by giving notice thereof
to the Lenders and the Borrower, and the Administrative Agent may be removed at
any time with or without cause by the Majority Lenders. Upon any such
resignation or removal, the Majority Lenders shall have the right to appoint a
successor Administrative Agent. If no successor Administrative Agent shall have
been so appointed by the Majority Lenders and shall have accepted such
appointment within thirty (30) days after the retiring Administrative Agent's
giving of notice of resignation or the Majority Lenders' removal of the retiring
Administrative Agent, then the retiring Administrative Agent may, on behalf of
the Lenders, appoint a successor Administrative Agent. Upon the acceptance of
such appointment hereunder by a successor Administrative Agent, such successor
Administrative Agent shall thereupon succeed to and become vested with all the
rights, powers, privileges and duties of the retiring Administrative Agent, and
the retiring Administrative Agent shall be discharged from its duties and
obligations hereunder. After any retiring Administrative Agent's resignation or
removal hereunder as Administrative Agent, the

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provisions of this Article XI and Section 12.03 shall continue in effect for its
benefit in respect of any actions taken or omitted to be taken by it while it
was acting as the Administrative Agent.

                                  ARTICLE XII

                                 MISCELLANEOUS

     Section 12.01 Waiver. No failure on the part of the Administrative Agent or
any Lender to exercise and no delay in exercising, and no course of dealing with
respect to, any right, power or privilege under any of the Loan Documents shall
operate as a waiver thereof, nor shall any single or partial exercise of any
right, power or privilege under any of the Loan Documents preclude any other or
further exercise thereof or the exercise of any other right, power or privilege.
The remedies provided herein are cumulative and not exclusive of any remedies
provided by law.

     Section 12.02 Notices. All notices and other communications provided for
herein and in the other Loan Documents (including, without limitation, any
modifications of, or waivers or consents under, this Agreement or the other Loan
Documents) shall be given or made by telex, telecopy, courier or U.S. Mail or in
writing and telexed, telecopied, mailed or delivered to the intended recipient
at the "Address for Notices" specified below its name on the signature pages
hereof or in the Loan Documents or, as to any party, at such other address as
shall be designated by such party in a notice to each other party. Except as
otherwise provided in this Agreement or in the other Loan Documents, all such
communications shall be deemed to have been duly given when transmitted, if
transmitted before 1:00 p.m. local time on a Business Day (otherwise on the next
succeeding Business Day) by telex or telecopier and evidence or confirmation of
receipt is obtained, or personally delivered or, in the case of a mailed notice,
three Business Days after the date deposited in the mails, postage prepaid, in
each case given or addressed as aforesaid.

     Section 12.03 Payment of Expenses, Indemnities, etc.

          (a)  The Borrower agrees:

               (i) whether or not the transactions hereby contemplated are
     consummated, to pay all reasonable expenses of the Administrative Agent in
     the administration (both before and after the execution hereof and
     including advice of counsel as to the rights and duties of the
     Administrative Agent and the Lenders with respect thereto) of, and in
     connection with the negotiation, syndication, investigation, preparation,
     execution and delivery of, recording or filing of, preservation of rights
     under, enforcement of, and refinancing, renegotiation or restructuring of,
     the Loan Documents and any amendment, waiver or consent relating thereto
     (including, without limitation, travel, photocopy, mailing, courier,
     telephone and other similar expenses of the Administrative Agent, the cost
     of environmental audits, surveys and appraisals obtained pursuant to
     authority to do so granted herein, the reasonable fees and disbursements of
     counsel and other outside consultants for the Administrative Agent and, in
     the case of enforcement, the reasonable fees and disbursements of counsel
     for the Administrative Agent and any of the Lenders); and promptly
     reimburse the Administrative Agent for all amounts expended, advanced or
     incurred by the Administrative Agent or the Lenders to

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     satisfy any obligation of the Borrower under this Agreement or any Security
     Instrument, including without limitation, all costs and expenses of
     foreclosure;

               (II)  TO INDEMNIFY THE ADMINISTRATIVE AGENT AND EACH LENDER AND
     EACH OF THEIR AFFILIATES AND EACH OF THEIR OFFICERS, DIRECTORS, EMPLOYEES,
     REPRESENTATIVES, AGENTS, ATTORNEYS, ACCOUNTANTS AND EXPERTS ("INDEMNIFIED
     PARTIES") FROM, HOLD EACH OF THEM HARMLESS AGAINST AND PROMPTLY UPON DEMAND
     PAY OR REIMBURSE EACH OF THEM FOR, THE INDEMNITY MATTERS WHICH MAY BE
     INCURRED BY OR ASSERTED AGAINST OR INVOLVE ANY OF THEM (WHETHER OR NOT ANY
     OF THEM IS DESIGNATED A PARTY THERETO) AS A RESULT OF, ARISING OUT OF OR IN
     ANY WAY RELATED TO (I) ANY ACTUAL OR PROPOSED USE BY THE BORROWER OF THE
     PROCEEDS OF ANY OF THE LOANS OR LETTERS OF CREDIT, (II) THE EXECUTION,
     DELIVERY AND PERFORMANCE OF THE LOAN DOCUMENTS, (III) THE OPERATIONS OF THE
     BUSINESS OF THE BORROWER AND ITS SUBSIDIARIES, (IV) THE FAILURE OF THE
     BORROWER OR ANY SUBSIDIARY TO COMPLY WITH THE TERMS OF ANY SECURITY
     INSTRUMENT OR THIS AGREEMENT, OR WITH ANY GOVERNMENTAL REQUIREMENT, (V) ANY
     INACCURACY OF ANY REPRESENTATION OR ANY BREACH OF ANY WARRANTY OF THE
     BORROWER OR ATP (UK) SET FORTH IN ANY OF THE LOAN DOCUMENTS, (VI) THE
     ISSUANCE, EXECUTION AND DELIVERY OR TRANSFER OF OR PAYMENT OR FAILURE TO
     PAY UNDER ANY LETTER OF CREDIT, OR (VII) THE PAYMENT OF A DRAWING UNDER ANY
     LETTER OF CREDIT NOTWITHSTANDING THE NON-COMPLIANCE, NON-DELIVERY OR OTHER
     IMPROPER PRESENTATION OF THE MANUALLY EXECUTED DRAFT(S) AND
     CERTIFICATION(S), (VIII) ANY ASSERTION THAT THE LENDERS WERE NOT ENTITLED
     TO RECEIVE THE PROCEEDS RECEIVED PURSUANT TO THE SECURITY INSTRUMENTS OR
     (IX) ANY OTHER ASPECT OF THE LOAN DOCUMENTS, INCLUDING, WITHOUT LIMITATION,
     THE REASONABLE FEES AND DISBURSEMENTS OF COUNSEL AND ALL OTHER EXPENSES
     INCURRED IN CONNECTION WITH INVESTIGATING, DEFENDING OR PREPARING TO DEFEND
     ANY SUCH ACTION, SUIT, PROCEEDING (INCLUDING ANY INVESTIGATIONS, LITIGATION
     OR INQUIRIES) OR CLAIM AND INCLUDING ALL INDEMNITY MATTERS ARISING BY
     REASON OF THE ORDINARY NEGLIGENCE OF ANY INDEMNIFIED PARTY, BUT EXCLUDING
     ALL INDEMNITY MATTERS ARISING SOLELY BY REASON OF CLAIMS BETWEEN THE
     LENDERS OR ANY LENDER AND THE ADMINISTRATIVE AGENT OR A LENDER'S
     SHAREHOLDERS AGAINST THE ADMINISTRATIVE AGENT OR LENDER OR BY REASON OF THE
     GROSS NEGLIGENCE OR WILLFUL MISCONDUCT ON THE PART OF THE INDEMNIFIED
     PARTY; AND

               (iii)  to indemnify and hold harmless from time to time the
     Indemnified Parties from and against any and all losses, claims, cost
     recovery actions, administrative orders or proceedings, damages and
     liabilities to which any such Person may become subject (i) under any
     Environmental Law applicable to the Borrower or any Subsidiary or any of
     their Properties, including without limitation, the treatment or disposal
     of hazardous substances on any of their Properties, (ii) as a result of the
     breach or non-compliance by the Borrower or any Subsidiary with any
     Environmental Law applicable to the Borrower or any Subsidiary, (iii) due
     to past ownership by the Borrower or any Subsidiary of any of their
     Properties or past activity on any

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     of their Properties which, though lawful and fully permissible at the time,
     could result in present liability, (iv) the presence, use, release,
     storage, treatment or disposal of hazardous substances on or at any of the
     Properties owned or operated by the Borrower or any Subsidiary, or (v) any
     other environmental, health or safety condition in connection with the Loan
     Documents; provided, however, no indemnity shall be afforded under this
     section 12.03(a)(iii) in respect of any Property for any occurrence arising
     from the acts or omissions of the Administrative Agent or any Lender during
     the period after which such Person, its successors or assigns shall have
     obtained possession of such Property (whether by foreclosure or deed in
     lieu of foreclosure, as mortgagee-in-possession or otherwise).

          (b) No Indemnified Party may settle any claim to be indemnified
     without the consent of the indemnitor, such consent not to be unreasonably
     withheld; provided, that the indemnitor may not reasonably withhold consent
     to any settlement that an Indemnified Party proposes, if the indemnitor
     does not have the financial ability to pay all its obligations outstanding
     and asserted against the indemnitor at that time, including the maximum
     potential claims against the Indemnified Party to be indemnified pursuant
     to this Section 12.03.

          (c)  In the case of any indemnification hereunder, the Administrative
     Agent or Lender, as appropriate shall give notice to the Borrower of any
     such claim or demand being made against the Indemnified Party and the
     Borrower shall have the non-exclusive right to join in the defense against
     any such claim or demand provided that if the Borrower provides a defense,
     the Indemnified Party shall bear its own cost of defense unless there is a
     conflict between the Borrower and such Indemnified Party.

          (d) The foregoing indemnities shall extend to the Indemnified Parties
     notwithstanding the sole or concurrent negligence of every kind or
     character whatsoever, whether active or passive, whether an affirmative act
     or an omission, including without limitation, all types of negligent
     conduct identified in the restatement (second) of torts of one or more of
     the Indemnified Parties or by reason of strict liability imposed without
     fault on any one or more of the Indemnified Parties.  To the extent that an
     Indemnified Party is found to have committed an act of gross negligence or
     willful misconduct, this contractual obligation of indemnification shall
     continue but shall only extend to the portion of the claim that is deemed
     to have occurred by reason of events other than the gross negligence or
     willful misconduct of the Indemnified Party.

          (e) The Borrower's obligations under this Section 12.03 shall survive
     any termination of this Agreement and the payment of the Notes and shall
     continue thereafter in full force and effect.

          (f) The Borrower shall pay any amounts due under this Section 12.03
     within 30 days of the receipt by the Borrower of notice of the amount due.

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     Section 12.04 Amendments, Etc. Any provision of this Agreement or any
Security Instrument may be amended, modified or waived with the Borrower's and
the Majority Lenders' prior written consent; provided that (i) no amendment,
modification or waiver which extends the final maturity of the Loans, increases
the Aggregate Maximum Credit Amounts, modifies the Borrowing Base or Monthly
Reduction Amount, forgives the principal amount of any Obligations outstanding
under this Agreement, releases any guarantor of any Obligations or releases all
or substantially all of the collateral, reduces the interest rate applicable to
the Loans or the fees payable to the Lenders generally, affects Section 2.03(a),
this Section 12.04 or Section 12.06(a) or modifies the definition of "Majority
Lenders" shall be effective without consent of all Lenders; (ii) no amendment,
modification or waiver which increases the Maximum Credit Amount of any Lender
shall be effective without the consent of such Lender; and (iii) no amendment,
modification or waiver which modifies the rights, duties or obligations of the
Administrative Agent shall be effective without the consent of the
Administrative Agent.

     Section 12.05 Successors and Assigns. This Agreement shall be binding upon
and inure to the benefit of the parties hereto and their respective successors
and permitted assigns.

     Section 12.06 Assignments and Participations.

          (a) The Borrower may not assign its rights or obligations hereunder or
     under the Notes or any Letters of Credit without the prior consent of all
     of the Lenders and the Administrative Agent.

          (b) Any Lender may, upon the written consent of the Administrative
     Agent and, if no Event of Default has occurred and is continuing, the
     Borrower (which consent will not be unreasonably withheld), assign to one
     or more assignees all or a portion of its rights and obligations under this
     Agreement pursuant to an Assignment Agreement substantially in the form of
     Exhibit E (an "Assignment"); provided, however, that (i) any such
     assignment shall be in the amount of at least $5,000,000 or such lesser
     amount to which the Borrower has consented and (ii) the assignee or
     assignor shall pay to the Administrative Agent a processing and recordation
     fee of $5,000 for each assignment.  Any such assignment will become
     effective upon the execution and delivery to the Administrative Agent of
     the Assignment and the consent of the Administrative Agent.  Promptly after
     receipt of an executed Assignment, the Administrative Agent shall send to
     the Borrower a copy of such executed Assignment.  Upon receipt of such
     executed Assignment, the Borrower, will, at its own expense, execute and
     deliver new Notes to the assignor and/or assignee, as appropriate, in
     accordance with their respective interests as they appear.  Upon the
     effectiveness of any assignment pursuant to this Section 12.06(b), the
     assignee will become a "Lender," if not already a "Lender," for all
     purposes of this Agreement and the Security Instruments.  The assignor
     shall be relieved of its obligations hereunder to the extent of such
     assignment (and if the assigning Lender no longer holds any rights or
     obligations under this Agreement, such assigning Lender shall cease to be a
     "Lender" hereunder except that its rights under Sections 4.06, 5.01, 5.05
     and 12.03 shall not be affected).  The Administrative Agent will prepare on
     the last Business Day of each month during which an assignment has become
     effective pursuant to this Section 12.06(b), a new Annex I giving effect to
     all such assignments effected during such month, and will promptly provide
     the same to the Borrower and each of the Lenders.

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<PAGE>

          (c) Each Lender may transfer, grant or assign participations in all or
     any part of such Lender's interests hereunder pursuant to this Section
     12.06(c) to any Person, provided that: (i) such Lender shall remain a
     "Lender" for all purposes of this Agreement and the transferee of such
     participation shall not constitute a "Lender" hereunder; and (ii) no
     participant under any such participation shall have rights to approve any
     amendment to or waiver of any of the Loan Documents except to the extent
     such amendment or waiver would (x) forgive any principal owing on any
     Obligations or extend the final maturity of the Loans, (y) reduce the
     interest rate (other than as a result of waiving the applicability of any
     post-default increases in interest rates) or fees applicable to any of the
     Commitments or Loans or Letters of Credit in which such participant is
     participating, or postpone the payment of any thereof, or (z) release any
     guarantor of the Obligations or release all or substantially all of the
     collateral (except as provided in the Loan Documents) supporting any of the
     Commitments or Loans or Letters of Credit in which such participant is
     participating.  In the case of any such participation, the participant
     shall not have any rights under this Agreement or any of the Security
     Instruments (the participant's rights against the granting Lender in
     respect of such participation to be those set forth in the agreement with
     such Lender creating such participation), and all amounts payable by the
     Borrower hereunder shall be determined as if such Lender had not sold such
     participation, provided that such participant shall be entitled to receive
     through such Lender additional amounts under Article V on the same basis as
     if it were a Lender (subject to the right of the Borrower, pursuant to
     Section 5.06, to replace any such Lender seeking additional compensation
     from the Borrower) and be indemnified under Section 12.03 as if it were a
     Lender.  In addition, each agreement creating any participation must
     include an agreement by the participant to be bound by the provisions of
     Section 12.15.

          (d) The Lenders may furnish any information concerning the Borrower in
     the possession of the Lenders from time to time to assignees and
     participants (including prospective assignees and participants); provided
     that, such Persons agree to be bound by the provisions of Section 12.15.

          (e) Notwithstanding anything in this Section 12.06 to the contrary,
     any Lender may assign and pledge its Note to any Federal Reserve Bank.  No
     such assignment and/or pledge shall release the assigning and/or pledging
     Lender from its obligations hereunder.

          (f) Notwithstanding any other provisions of this Section 12.06, no
     transfer or assignment of the interests or obligations of any Lender or any
     grant of participations therein shall be permitted if such transfer,
     assignment or grant would require the Borrower to file a registration
     statement with the SEC or to qualify the Loans under the "Blue Sky" laws of
     any state.

     Section 12.07 Invalidity. In the event that any one or more of the
provisions contained in any of the Loan Documents or the Letters of Credit, the
Letter of Credit Agreements shall, for any reason, be held invalid, illegal or
unenforceable in any respect, such invalidity, illegality or unenforceability
shall not affect any other provision of the Notes, this Agreement or any other
Loan Document.

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<PAGE>

     Section 12.08 Counterparts. This Agreement may be executed in any number of
counterparts, all of which taken together shall constitute one and the same
instrument and any of the parties hereto may execute this Agreement by signing
any such counterpart.

     Section 12.09 References; Use of Word "Including". The words "herein,"
"hereof," "hereunder" and other words of similar import when used in this
Agreement refer to this Agreement as a whole, and not to any particular article,
section or subsection. Any reference herein to a Section or Article shall be
deemed to refer to the applicable Section or Article of this Agreement unless
otherwise stated herein. Any reference herein to an exhibit, schedule, or other
attachment shall be deemed to refer to the applicable exhibit, schedule, or
other attachment attached hereto unless otherwise stated herein. The word
"including", "includes" and words of similar import means "including, without
limitation".

     Section 12.10 Survival. The obligations of the parties under Section 4.06,
Article V, and Sections 11.05 and 12.03 shall survive the repayment of the Loans
and the termination of the Commitments. To the extent that any payments on the
Obligations or proceeds of any collateral are subsequently invalidated, declared
to be fraudulent or preferential, set aside or required to be repaid to a
trustee, debtor in possession, receiver or other Person under any bankruptcy
law, common law or equitable cause, then to such extent, the Obligations so
satisfied shall be revived and continue as if such payment or proceeds had not
been received and the Administrative Agent's and the Lenders' Liens, security
interests, rights, powers and remedies under this Agreement and each Security
Instrument shall continue in full force and effect. In such event, each Security
Instrument shall be automatically reinstated and the Borrower shall take such
action as may be reasonably requested by the Administrative Agent and the
Lenders to effect such reinstatement.

     Section 12.11 Captions. Captions and section headings appearing herein are
included solely for convenience of reference and are not intended to affect the
interpretation of any provision of this Agreement.

     Section 12.12 No Oral Agreements. The Loan Documents embody the entire
agreement and understanding between the parties and supersede all other
agreements and understandings between such parties relating to the subject
matter hereof and thereof. The 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.

     Section 12.13 Governing Law; Submission to Jurisdiction.

          (A)  THIS AGREEMENT AND THE NOTES SHALL BE GOVERNED BY, AND CONSTRUED
     IN ACCORDANCE WITH, THE LAWS OF THE STATE OF TEXAS, EXCEPT TO THE EXTENT
     THAT UNITED STATES FEDERAL LAW PERMITS ANY LENDER TO CHARGE INTEREST AT THE
     RATE ALLOWED BY THE LAWS OF THE STATE WHERE SUCH LENDER IS LOCATED. CH. 346
     OF THE TEXAS FINANCE CODE (WHICH REGULATES CERTAIN REVOLVING CREDIT LOAN
     ACCOUNTS AND REVOLVING TRI-PARTY ACCOUNTS) SHALL NOT APPLY TO THIS
     AGREEMENT OR THE NOTES.

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          (B)  ANY LEGAL ACTION OR PROCEEDING WITH RESPECT TO THE LOAN DOCUMENTS
     SHALL BE BROUGHT IN THE COURTS OF THE STATE OF TEXAS LOCATED IN HOUSTON,
     TEXAS OR OF THE UNITED STATES OF AMERICA FOR THE SOUTHERN DISTRICT OF
     TEXAS, HOUSTON DIVISION, AND, BY EXECUTION AND DELIVERY OF THIS AGREEMENT,
     THE BORROWER HEREBY ACCEPTS FOR ITSELF AND (TO THE EXTENT PERMITTED BY LAW)
     IN RESPECT OF ITS PROPERTY, GENERALLY AND UNCONDITIONALLY, THE JURISDICTION
     OF THE AFORESAID COURTS.  THE BORROWER HEREBY IRREVOCABLY WAIVES ANY
     OBJECTION, INCLUDING, WITHOUT LIMITATION, ANY OBJECTION TO THE LAYING OF
     VENUE OR BASED ON THE GROUNDS OF FORUM NON CONVENIENS, WHICH IT MAY NOW OR
     HEREAFTER HAVE TO THE BRINGING OF ANY SUCH ACTION OR PROCEEDING IN SUCH
     RESPECTIVE JURISDICTIONS.  THIS SUBMISSION TO JURISDICTION IS NON-EXCLUSIVE
     AND DOES NOT PRECLUDE THE ADMINISTRATIVE AGENT OR ANY LENDER FROM OBTAINING
     JURISDICTION OVER THE BORROWER IN ANY COURT OTHERWISE HAVING JURISDICTION.

          (C)  THE BORROWER HEREBY IRREVOCABLY CONSENTS TO THE SERVICE OF
     PROCESS OF ANY OF THE AFOREMENTIONED COURTS IN ANY SUCH ACTION OR
     PROCEEDING BY THE MAILING OF COPIES THEREOF BY REGISTERED OR CERTIFIED
     MAIL, POSTAGE PREPAID, TO THE BORROWER AT ITS SAID ADDRESS, SUCH SERVICE TO
     BECOME EFFECTIVE 30 DAYS AFTER SUCH MAILING.  NOTHING HEREIN SHALL AFFECT
     THE RIGHT OF THE ADMINISTRATIVE AGENT, ANY LENDER OR ANY HOLDER OF A NOTE
     TO SERVE PROCESS IN ANY OTHER MANNER PERMITTED BY LAW OR TO COMMENCE LEGAL
     PROCEEDINGS OR OTHERWISE PROCEED AGAINST THE BORROWER OR ITS PROPERTIES IN
     ANY OTHER JURISDICTION.

          (D)  THE BORROWER, THE ADMINISTRATIVE AGENT  AND EACH LENDER HEREBY
     (I) IRREVOCABLY AND UNCONDITIONALLY WAIVE, TO THE FULLEST EXTENT PERMITTED
     BY LAW, TRIAL BY JURY IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS
     AGREEMENT OR ANY LOAN DOCUMENT AND FOR ANY COUNTERCLAIM THEREIN; (II)
     IRREVOCABLY WAIVE, TO THE MAXIMUM EXTENT NOT PROHIBITED BY LAW, ANY RIGHT
     IT MAY HAVE TO CLAIM OR RECOVER IN ANY SUCH LITIGATION ANY SPECIAL,
     EXEMPLARY, PUNITIVE OR CONSEQUENTIAL DAMAGES, OR DAMAGES OTHER THAN, OR IN
     ADDITION TO, ACTUAL DAMAGES; (III) CERTIFY THAT NO PARTY HERETO NOR ANY
     REPRESENTATIVE,  AGENT OR COUNSEL FOR ANY PARTY HERETO HAS REPRESENTED,
     EXPRESSLY OR OTHERWISE, OR IMPLIED THAT SUCH PARTY WOULD NOT, IN THE EVENT
     OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVERS, AND (IV) ACKNOWLEDGE
     THAT IT HAS BEEN INDUCED TO ENTER INTO  THIS CREDIT AGREEMENT AND THE OTHER
     LOAN DOCUMENTS AND THE TRANSACTIONS CONTEMPLATED HEREBY AND THEREBY BY,
     AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS CONTAINED IN THIS
     SECTION 12.13.

     Section 12.14 Interest. It is the intention of the parties hereto that each
Lender shall conform strictly to usury laws applicable to it. Accordingly, if
the transactions contemplated hereby would be usurious as to any Lender under
laws applicable to it (including the laws of the United States of America and
the State of New York or any other jurisdiction whose laws may be mandatorily
applicable to such Lender notwithstanding the other provisions of this
Agreement), then, in that event, notwithstanding anything to the contrary in any
of the Loan

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Documents or any agreement entered into in connection with or as security for
the Notes, it is agreed as follows: (i) the aggregate of all consideration which
constitutes interest under law applicable to any Lender that is contracted for,
taken, reserved, charged or received by such Lender under any of the Loan
Documents or agreements or otherwise in connection with the Notes shall under no
circumstances exceed the maximum amount allowed by such applicable law, and any
excess shall be canceled automatically and if theretofore paid shall be credited
by such Lender on the principal amount of the Obligations (or, to the extent
that the principal amount of the Obligations shall have been or would thereby be
paid in full, refunded by such Lender to the Borrower); and (ii) in the event
that the maturity of the Notes is accelerated by reason of an election of the
holder thereof resulting from any Event of Default under this Agreement or
otherwise, or in the event of any required or permitted prepayment, then such
consideration that constitutes interest under law applicable to any Lender may
never include more than the maximum amount allowed by such applicable law, and
excess interest, if any, provided for in this Agreement or otherwise shall be
canceled automatically by such Lender as of the date of such acceleration or
prepayment and, if theretofore paid, shall be credited by such Lender on the
principal amount of the Obligations (or, to the extent that the principal amount
of the Obligations shall have been or would thereby be paid in full, refunded by
such Lender to the Borrower). All sums paid or agreed to be paid to any Lender
for the use, forbearance or detention of sums due hereunder shall, to the extent
permitted by law applicable to such Lender, be amortized, prorated, allocated
and spread throughout the full term of the Loans evidenced by the Notes until
payment in full so that the rate or amount of interest on account of any Loans
hereunder does not exceed the maximum amount allowed by such applicable law. If
at any time and from time to time (i) the amount of interest payable to any
Lender on any date shall be computed at the Highest Lawful Rate applicable to
such Lender pursuant to this Section 12.14 and (ii) in respect of any subsequent
interest computation period the amount of interest otherwise payable to such
Lender would be less than the amount of interest payable to such Lender computed
at the Highest Lawful Rate applicable to such Lender, then the amount of
interest payable to such Lender in respect of such subsequent interest
computation period shall continue to be computed at the Highest Lawful Rate
applicable to such Lender until the total amount of interest payable to such
Lender shall equal the total amount of interest which would have been payable to
such Lender if the total amount of interest had been computed without giving
effect to this Section 12.14.

     Section 12.15 Confidentiality. In the event that the Borrower provides to
the Administrative Agent or the Lenders written confidential information
belonging to the Borrower, if the Borrower shall denominate such information in
writing as "confidential", the Administrative Agent and the Lenders shall
thereafter maintain such information in confidence in accordance with the
standards of care and diligence that each utilizes in maintaining its own
confidential information. This obligation of confidence shall not apply to such
portions of the information which (i) are in the public domain, (ii) hereafter
become part of the public domain without the Administrative Agent or the Lenders
breaching their obligation of confidence to the Borrower, (iii) are previously
known by the Administrative Agent or the Lenders from some source other than the
Borrower, (iv) are hereafter developed by the Administrative Agent or the
Lenders without using the Borrower's information, (v) are hereafter obtained by
or available to the Administrative Agent or the Lenders from a third party who
owes no obligation of confidence to the Borrower with respect to such
information or through any other means other than through disclosure by the
Borrower, (vi) are disclosed with the Borrower's consent, (vii)

                                       74
<PAGE>

must be disclosed either pursuant to any Governmental Requirement or to Persons
regulating the activities of the Administrative Agent or the Lenders, or (viii)
as may be required by law or regulation or order of any Governmental Authority
in any judicial, arbitration or governmental proceeding. Further, the
Administrative Agent or a Lender may disclose any such information to any other
Lender, any independent petroleum engineers or consultants, any independent
certified public accountants, any legal counsel employed by such Person in
connection with this Agreement or any Security Instrument, including without
limitation, the enforcement or exercise of all rights and remedies thereunder,
or any assignee or participant (including prospective assignees and
participants) in the Loans; provided, however, that the Administrative Agent or
the Lenders shall receive a confidentiality agreement from the Person to whom
such information is disclosed such that said Person shall have the same
obligation to maintain the confidentiality of such information as is imposed
upon the Administrative Agent or the Lenders hereunder.  Notwithstanding
anything to the contrary provided herein, this obligation of confidence shall
cease three years from the date the information was furnished, unless the
Borrower requests in writing at least 30 days prior to the expiration of such
three year period, to maintain the confidentiality of such information for an
additional three year period.  The Borrower waives any and all other rights it
may have to confidentiality as against the Administrative Agent and the Lenders
arising by contract, agreement, statute or law except as expressly stated in
this Section 12.15.

                        [SIGNATURES BEGIN ON NEXT PAGE]

                                       75
<PAGE>

     The parties hereto have caused this Agreement to be duly executed as of the
day and year first above written.

BORROWER:                           ATP OIL & GAS CORPORATION

                                    By: /s/ T. Paul Bulmahn
                                       ---------------------------------------
                                       T. Paul Bulmahn
                                       President

                                    Address for Notices:
                                    4600 Post Oak Place
                                    Suite 200
                                    Houston, Texas 77027
                                    Telecopier No.:  (713) 622-5101
                                    Telephone No.:  (713) 622-3311
                                    Attention:  Chief Financial Officer

                                    with copy to:

                                    Jackson Walker L.L.P.
                                    1100 Louisiana, Suite 4200
                                    Houston, Texas 77002
                                    Telecopier No.:  (713) 752-4221
                                    Telephone No.:  (713) 752-4401
                                    Attention:  David G. Dunlap

                                      S-1
<PAGE>

LENDER AND AGENT:                   BNP PARIBAS, individually
                                    and as Administrative Agent

                                    By: /s/ Brian Malone
                                       --------------------------------
                                       Brian Malone
                                       Managing Director

                                    By: /s/ Betsy Jocher
                                       --------------------------------
                                       Betsy Jocher
                                       Vice President

                                    Lending Office for Base Rate Loans and
                                    LIBOR Loans:

                                    1200 Smith Street, Suite 3100
                                    Houston, Texas 77002

                                    Address for Notices:
                                    1200 Smith Street, Suite 3100
                                    Houston, Texas 77002
                                    Telecopier No.: (713) 659-6915
                                    Telephone No.: (713) 659-4811
                                    Attention:  Brian Malone

                                      S-2
<PAGE>

                                    ANNEX I

              LIST OF PERCENTAGE SHARES AND MAXIMUM CREDIT AMOUNTS

         Name of Lender         Percentage Share      Maximum Credit Amount
         --------------         ----------------      ---------------------
BNP PARIBAS                            100%                $100,000,000
          TOTAL                        100%                $100,000,000

                                   Annex I-1
<PAGE>

                                   EXHIBIT A

                                  FORM OF NOTE

$___________________,                                   ________________, 200__

     FOR VALUE RECEIVED, ATP OIL & GAS CORPORATION, a ____________ corporation
(the "Borrower") hereby promises to pay to the order of __________________ (the
"Lender"), at the Principal Office of BNP Paribas (the "Administrative Agent"),
at _______________________________, the principal sum of _____________ Dollars
($____________) (or such lesser amount as shall equal the aggregate unpaid
principal amount of the Loans made by the Lender to the Borrower under the
Credit Agreement, as hereinafter defined), in lawful money of the United States
of America and in immediately available funds, on the dates and in the principal
amounts provided in the Credit Agreement, and to pay interest on the unpaid
principal amount of each such Loan, at such office, in like money and funds, for
the period commencing on the date of such Loan until such Loan shall be paid in
full, at the rates per annum and on the dates provided in the Credit Agreement.

     The date, amount, Type, interest rate, Interest Period and maturity of each
Loan made by the Lender to the Borrower, and each payment made on account of the
principal thereof, shall be recorded by the Lender on its books and, prior to
any transfer of this Note, endorsed by the Lender on the schedules attached
hereto or any continuation thereof.

     This Note is one of the Notes referred to in the Credit Agreement dated as
of April 27, 2001 among the Borrower, the Lenders which are or become parties
thereto (including the Lender) and the Administrative Agent (as the same may be
amended or supplemented from time to time, the "Credit Agreement"), and
evidences Loans made by the Lender thereunder.  Capitalized terms used in this
Note have the respective meanings assigned to them in the Credit Agreement.

     This Note is issued pursuant to the Credit Agreement and is entitled to the
benefits provided for in the Credit Agreement and the Security Instruments.  The
Credit Agreement provides for the acceleration of the maturity of this Note upon
the occurrence of certain events, for prepayments of Loans upon the terms and
conditions specified therein and other provisions relevant to this Note.

     THIS NOTE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS
OF THE STATE OF NEW YORK.

                                    ATP OIL & GAS CORPORATION

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

                                  Exhibit A-1
<PAGE>

                                   EXHIBIT B

             FORM OF BORROWING, CONTINUATION AND CONVERSION REQUEST

                          _____________________, 200__

     ATP OIL & GAS CORPORATION, a ___________ corporation (the "Borrower"),
pursuant to the Credit Agreement dated as of April 27, 2001 among the Borrower,
BNP Paribas, as Administrative Agent for the lenders (the "Lenders") which are
or become parties thereto, and such Lenders (together with all amendments or
supplements thereto, the "Credit Agreement"), hereby makes the requests
indicated below (unless otherwise defined herein, capitalized terms are defined
in the Credit Agreement):

     1.   Loans:

     (a)  Aggregate amount of new Loans to be $______________________;

     (b)  Requested funding date is _________________, 200__;

     (c)  $_____________________ of such borrowings are to be LIBOR Loans;
          $_____________________ of such borrowings are to be Base Rate Loans;
          and

     (d)  Length of Interest Period for LIBOR Loans is:
          _________________________.

     2.   LIBOR Loan Continuation for LIBOR Loans maturing on _________________:

     (a)  Aggregate amount to be continued as LIBOR Loans is
          $____________________;

     (b)  Aggregate amount to be converted to Base Rate Loans is
          $__________________;

     (c)  Length of Interest Period for continued LIBOR Loans is
          ____________________.

     3.   Conversion of Outstanding Base Rate Loans to LIBOR Loans:

          Convert $__________________ of the outstanding Base Rate
          Loans to LIBOR Loans on ____________________ with an Interest Period
          of ______________________.

     4.   Conversion of outstanding LIBOR Loans to Base Rate Loans:

          Convert $__________________ of the outstanding LIBOR Loans
          with Interest Period maturing on  ______________________, 200_, to
          Base Rate Loans.

                                  Exhibit B-1
<PAGE>

     The undersigned certifies that he is the _____________________ of the
Borrower, and that as such he is authorized to execute this certificate on
behalf of the Borrower.  The undersigned further certifies, represents and
warrants on behalf of the Borrower that the Borrower is entitled to receive the
requested borrowing, continuation or conversion under the terms and conditions
of the Credit Agreement.

                                    ATP OIL & GAS CORPORATION

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

                                  Exhibit B-2
<PAGE>

                                   EXHIBIT C

                         FORM OF COMPLIANCE CERTIFICATE

     The undersigned hereby certifies that he is the ________________ of ATP OIL
& GAS CORPORATION, a ____________ corporation (the "Borrower") and that as such
he is authorized to execute this certificate on behalf of the Borrower.  With
reference to the Credit Agreement dated as of April 27, 2001 among the Borrower,
BNP Paribas, as Administrative Agent for the lenders (the "Lenders") which are
or become a party thereto, and such Lenders (together with all amendments or
supplements thereto being the "Credit Agreement"), the undersigned represents
and warrants as follows (each capitalized term used herein having the same
meaning given to it in the Credit Agreement unless otherwise specified):

          (a) The representations and warranties of the Borrower contained in
     Article VII of the Credit Agreement and in the Security Instruments and
     otherwise made in writing by or on behalf of the Borrower pursuant to the
     Credit Agreement and the Security Instruments were true and correct when
     made, and are repeated at and as of the time of delivery hereof and are
     true and correct at and as of the time of delivery hereof, except to the
     extent any such representations and warranties are expressly limited to an
     earlier date or the Majority Lenders have expressly consented in writing to
     the contrary.

          (b) The Borrower has performed and complied with all agreements and
     conditions contained in the Credit Agreement and in the Security
     Instruments required to be performed or complied with by it prior to or at
     the time of delivery hereof.

          (c) Neither the Borrower nor any Subsidiary has incurred any material
     liabilities, direct or contingent, since _________________, except those
     set forth in Schedule 9.01 to the Credit Agreement and except those allowed
     by the terms of the Credit Agreement or consented to by the Lenders in
     writing.

          (d) Since __________________, no change has occurred, either in any
     case or in the aggregate, in the condition, financial or otherwise, of the
     Borrower or any Subsidiary which would have a Material Adverse Effect.

          (e) There exists, and, after giving effect to the loan or loans with
     respect to which this certificate is being delivered, will exist, no
     Default under the Credit Agreement or any event or circumstance which
     constitutes, or with notice or lapse of time (or both) would constitute, an
     event of default under any loan or credit agreement, indenture, deed of
     trust, security agreement or other agreement or instrument evidencing or
     pertaining to any Debt of the Borrower or any Subsidiary, or under any
     material agreement or instrument to which the Borrower or any Subsidiary is
     a party or by which the Borrower or any Subsidiary is bound.

          (f) The financial statements furnished to the Administrative Agent
     with this certificate fairly present the consolidated financial condition
     and results

                                  Exhibit C-1
<PAGE>

     of operations of the Borrower and its Consolidated Subsidiaries as at the
     end of, and for, the [fiscal quarter] [fiscal year] ending
     _________________________ and such financial statements have been prepared
     in accordance with the accounting procedures specified in the Credit
     Agreement.

          (g) Attached hereto are the detailed computations necessary to
     determine whether the Borrower and its Consolidated Subsidiaries are in
     compliance with Sections 9.13, 9.14 and 9.15 of the Credit Agreement as of
     the end of the [fiscal quarter] [fiscal year] ending
     _________________________.

     EXECUTED AND DELIVERED this ____ day of ______________.

                                    ATP OIL & GAS CORPORATION

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

                                  Exhibit C-2
<PAGE>

                                   EXHIBIT D

                              SECURITY INSTRUMENTS

1.   Mortgage, Deed of Trust, Assignment of Production, Security Agreement and
     Financing Statement executed by the Borrower relating to its Oil and Gas
     Properties offshore of the State of Texas.

2.   Act of Mortgage, Assignment of Production, Security Agreement, Fixture
     Filing and Financing Statement executed by the Borrower relating to its Oil
     and Gas Properties offshore of the State of Louisiana.

3.   Security Agreement executed by the Borrower.

4.   Financing Statements relating to the documents described in items 1, 2 and
     3.

5.   Stock Pledge executed by the Borrower relating to 65% of the issued and
     outstanding stock of ATP (UK).

6.   Assignment Separate from Stock Certificate executed in blank by the
     Borrower relating to the foregoing stock pledge.

7.   Financing Statements relating to the foregoing stock pledge.

8.   Instrument executed by ATP (UK) granting a fixed and floating charge on its
     Oil and Gas Properties in the North Sea and any related assets.

9.   Registrations of the fixed and floating charges described in the prior
     item.

                                  Exhibit D-1
<PAGE>

                                   EXHIBIT E

                         FORM OF ASSIGNMENT AGREEMENT

     ASSIGNMENT AGREEMENT ("Agreement") dated as of ________________, 2001
between: _______________________ (the "Assignor") and _____________________ (the
"Assignee").

                                    RECITALS

     A. The Assignor is a party to the Credit Agreement dated as of April 27,
2001 (as amended and supplemented and in effect from time to time, the "Credit
Agreement") among ATP Oil & Gas Corporation, a _________________________
corporation (the "Borrower"), each of the lenders that is or becomes a party
thereto as provided in Section 12.06 of the Credit Agreement (individually,
together with its successors and assigns, a "Lender", and collectively, together
with their successors and assigns, the "Lenders"), and BNP Paribas, in its
individual capacity, ("Paribas") and as agent for the Lenders (in such capacity,
together with its successors in such capacity, the "Administrative Agent").

     B. The Assignor proposes to sell, assign and transfer to the Assignee, and
the Assignee proposes to purchase and assume from the Assignor, [all][a portion]
of the Assignor's Maximum Credit Amount, outstanding Loans and its Percentage
Share of the outstanding LC Exposure, all on the terms and conditions of this
Agreement.

     C. In consideration of the foregoing and the mutual agreements contained
herein, and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto agree as
follows:

                                   ARTICLE I

                                  Definitions.

     Section 1.01 Definitions. All capitalized terms used but not defined herein
have the respective meanings given to such terms in the Credit Agreement.

     Section 1.02 Other Definitions. As used herein, the following terms have
the following respective meanings:

          "Assigned Interest" shall mean all of Assignor's (in its capacity as a
     "Lender") rights and obligations under the Credit Agreement and the other
     Security Instruments in respect of the Commitment of the Assignor relating
     to the Assignor's Maximum Credit Amount in the principal amount equal to
     $____________________ and the principal amount of the Loans outstanding
     thereunder, currently in the amount of $_________________ (the "Loan
     Balance"), plus the interest and fees which will accrue from and after the
     Assignment Date.

          "Assignment Date" shall mean _____________________, 200__.

                                  Exhibit E-1
<PAGE>

                                   ARTICLE II

                              Sale and Assignment.

     Section 2.01 Sale and Assignment. On the terms and conditions set forth
herein, effective on and as of the Assignment Date, the Assignor hereby sells,
assigns and transfers to the Assignee, and the Assignee hereby purchases and
assumes from the Assignor, all of the right, title and interest of the Assignor
in and to, and all of the obligations of the Assignor in respect of, the
Assigned Interest. Such sale, assignment and transfer are without recourse and,
except as expressly provided in this Agreement, without representation or
warranty.

     Section 2.02 Assumption of Obligations. The Assignee agrees with the
Assignor (for the express benefit of the Assignor and the Borrower) that the
Assignee will, from and after the Assignment Date, perform all of the
obligations of the Assignor in respect of the Assigned Interest. From and after
the Assignment Date: (a) the Assignor shall be released from the Assignor's
obligations in respect of the Assigned Interest, and (b) the Assignee shall be
entitled to all of the Assignor's rights, powers and privileges under the Credit
Agreement and the other Security Instruments in respect of the Assigned
Interest.

     Section 2.03 Consent by Administrative Agent. By executing this Agreement
as provided below, in accordance with Section 12.06(b) of the Credit Agreement,
the Administrative Agent hereby acknowledges notice of the transactions
contemplated by this Agreement and consents to such transactions.

                                  ARTICLE III

                                   Payments.

     Section 3.01 Payments.  As consideration for the sale, assignment and
transfer contemplated by Section 2.01 hereof, the Assignee shall, on the
Assignment Date, assume Assignor's obligations in respect of the Assigned
Interest and pay to the Assignor an amount equal to the Loan Balance, if any.
An amount equal to all accrued and unpaid interest and fees shall be paid to the
Assignor as provided in Section 3.02 (iii) below.  Except as otherwise provided
in this Agreement, all payments hereunder shall be made in Dollars and in
immediately available funds, without setoff, deduction or counterclaim.

     Section 3.02 Allocation of Payments. The Assignor and the Assignee agree
that (i) the Assignor shall be entitled to any payments of principal with
respect to the Assigned Interest made prior to the Assignment Date, together
with any interest and fees with respect to the Assigned Interest accrued prior
to the Assignment Date, (ii) the Assignee shall be entitled to any payments of
principal with respect to the Assigned Interest made from and after the
Assignment Date, together with any and all interest and fees with respect to the
Assigned Interest accruing from and after the Assignment Date, and (iii) the
Administrative Agent is authorized and instructed to allocate payments received
by it for account of the Assignor and the Assignee as provided in the foregoing
clauses. Each party hereto agrees that it will hold any interest, fees or other
amounts that it may receive to which the other party hereto shall be entitled
pursuant to the

                                  Exhibit E-2
<PAGE>

preceding sentence for account of such other party and pay, in like money and
funds, any such amounts that it may receive to such other party promptly upon
receipt.

     Section 3.03 Delivery of Notes. Promptly following the receipt by the
Assignor of the consideration required to be paid under Section 3.01 hereof, the
Assignor shall, in the manner contemplated by Section 12.06(b) of the Credit
Agreement, (i) deliver to the Administrative Agent (or its counsel) the Note
held by the Assignor and (ii) notify the Administrative Agent to request that
the Borrower execute and deliver new Notes to the Assignor, if Assignor
continues to be a Lender, and the Assignee, dated the date of this Agreement in
respective principal amounts equal to the respective Maximum Credit Amounts of
the Assignor (if appropriate) and the Assignee after giving effect to the sale,
assignment and transfer contemplated hereby.

     Section 3.04 Further Assurances. The Assignor and the Assignee hereby agree
to execute and deliver such other instruments, and take such other actions, as
either party may reasonably request in connection with the transactions
contemplated by this Agreement.

                                   ARTICLE IV

                             Conditions Precedent.

     Section 4.01 Conditions Precedent. The effectiveness of the sale,
assignment and transfer contemplated hereby is subject to the satisfaction of
each of the following conditions precedent:

          (a) the execution and delivery of this Agreement by the Assignor and
     the Assignee;

          (b) the receipt by the Assignor of the payment required to be made by
     the Assignee under Section 3.01 hereof; and

          (c) the acknowledgment and consent by the Administrative Agent
     contemplated by Section 2.03 hereof.

                                   ARTICLE V

                        Representations and Warranties.

     Section 5.01 Representations and Warranties of the Assignor. The Assignor
represents and warrants to the Assignee as follows:

          (a) it has all requisite power and authority, and has taken all action
     necessary to execute and deliver this Agreement and to fulfill its
     obligations under, and consummate the transactions contemplated by, this
     Agreement;

          (b) the execution, delivery and compliance with the terms hereof by
     Assignor and the delivery of all instruments required to be delivered by it
     hereunder do not and will not violate any Governmental Requirement
     applicable to it;

                                  Exhibit E-3
<PAGE>

          (c) this Agreement has been duly executed and delivered by it and
     constitutes the legal, valid and binding obligation of the Assignor,
     enforceable against it in accordance with its terms;

          (d) all approvals and authorizations of, all filings with and all
     actions by any Governmental Authority necessary for the validity or
     enforceability of its obligations under this Agreement have been obtained;

          (e) the Assignor has good title to, and is the sole legal and
     beneficial owner of, the Assigned Interest, free and clear of all Liens,
     claims, participations or other charges of any nature whatsoever; and

          (f) the transactions contemplated by this Agreement are commercial
     banking transactions entered into in the ordinary course of the banking
     business of the Assignor.

     Section 5.02 Disclaimer. Except as expressly provided in Section 5.01
hereof, the Assignor does not make any representation or warranty, nor shall it
have any responsibility to the Assignee, with respect to the accuracy of any
recitals, statements, representations or warranties contained in the Credit
Agreement or in any certificate or other document referred to or provided for
in, or received by any Lender under, the Credit Agreement, or for the value,
validity, effectiveness, genuineness, execution, effectiveness, legality,
enforceability or sufficiency of the Credit Agreement, the Notes or any other
document referred to or provided for therein or for any failure by the Borrower
or any other Person (other than Assignor) to perform any of its obligations
thereunder prior or for the existence, value, perfection or priority of any
collateral security or the financial or other condition of the Borrower or the
Subsidiaries [or any other obligor or guarantor], or any other matter relating
to the Credit Agreement or any other Security Instrument or any extension of
credit thereunder.

     Section 5.03 Representations and Warranties of the Assignee. The Assignee
represents and warrants to the Assignor as follows:

          (a) it has all requisite power and authority, and has taken all action
     necessary to execute and deliver this Agreement and to fulfill its
     obligations under, and consummate the transactions contemplated by, this
     Agreement;

          (b) the execution, delivery and compliance with the terms hereof by
     Assignee and the delivery of all instruments required to be delivered by it
     hereunder do not and will not violate any Governmental Requirement
     applicable to it;

          (c) this Agreement has been duly executed and delivered by it and
     constitutes the legal, valid and binding obligation of the Assignee,
     enforceable against it in accordance with its terms;

          (d) all approvals and authorizations of, all filings with and all
     actions by any Governmental Authority necessary for the validity or
     enforceability of its obligations under this Agreement have been obtained;

                                  Exhibit E-4
<PAGE>

          (e) the Assignee has fully reviewed the terms of the Credit Agreement
     and the other Security Instruments and has independently and without
     reliance upon the Assignor, and based on such information as the Assignee
     has deemed appropriate, made its own credit analysis and decision to enter
     into this Agreement;

          (f) the Assignee hereby affirms that the representations contained in
     Section 4.06(d)(i) of the Credit Agreement are true and accurate as to it
     and, the Assignee has contemporaneously herewith delivered to the
     Administrative Agent and the Borrower such certifications as are required
     thereby to avoid the withholding taxes referred to in Section 4.06; and

          (g) the transactions contemplated by this Agreement are commercial
     banking transactions entered into in the ordinary course of the banking
     business of the Assignee.

                                   ARTICLE VI

                                 Miscellaneous.

     Section 6.01 Notices. All notices and other communications provided for
herein (including, without limitation, any modifications of, or waivers,
requests or consents under, this Agreement) shall be given or made in writing
(including, without limitation, by telex or telecopy) to the intended recipient
at its "Address for Notices" specified below its name on the signature pages
hereof or, as to either party, at such other address as shall be designated by
such party in a notice to the other party.

     Section 6.02 Amendment, Modification or Waiver. No provision of this
Agreement may be amended, modified or waived except by an instrument in writing
signed by the Assignor and the Assignee, and consented to by the Administrative
Agent.

     Section 6.03 Successors and Assigns. This Agreement shall be binding upon
and inure to the benefit of the parties hereto and their respective successors
and permitted assigns. The representations and warranties made herein by the
Assignee are also made for the benefit of the Administrative Agent and the
Borrower, and the Assignee agrees that the Administrative Agent and the Borrower
are entitled to rely upon such representations and warranties.

     Section 6.04 Assignments. Neither party hereto may assign any of its rights
or obligations hereunder except in accordance with the terms of the Credit
Agreement.

     Section 6.05 Captions. The captions and section headings appearing herein
are included solely for convenience of reference and are not intended to affect
the interpretation of any provision of this Agreement.

     Section 6.06 Counterparts. This Agreement may be executed in any number of
counterparts, each of which shall be identical and all of which, taken together,
shall constitute one and the same instrument, and each of the parties hereto may
execute this Agreement by signing any such counterpart.

                                  Exhibit E-5
<PAGE>

     Section 6.07 Governing Law. This Agreement shall be governed by, and
construed in accordance with, the law of the State of ________________.

     Section 6.08 Expenses. To the extent not paid by the Borrower pursuant to
the terms of the Credit Agreement, each party hereto shall bear its own expenses
in connection with the execution, delivery and performance of this Agreement.

     Section 6.09 Waiver of Jury Trial. EACH OF THE PARTIES HERETO HEREBY
IRREVOCABLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY LAW, ANY AND ALL RIGHT TO
TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO THIS
AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY.

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

                                    ASSIGNOR:

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

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

                                    Address for Notices:

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

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

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

                                    Telecopier No.:
                                                   -------------------
                                    Telephone No.:
                                                  --------------------
                                    Attention:
                                              ------------------------

                                    ASSIGNEE:

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

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

                                  Exhibit E-6
<PAGE>

                                    Address for Notices:

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

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

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

                                    Telecopier No.:
                                                   -------------------
                                    Telephone No.:
                                                  --------------------
                                    Attention:
                                              ------------------------

ACKNOWLEDGED AND CONSENTED TO:

------------------------------,
as Administrative Agent

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

                                  Exhibit E-7
<PAGE>

                                 SCHEDULE 7.02

                                  LIABILITIES

     None except as disclosed in the Financial Statements or on Schedules 7.20
and 7.22.

                                Schedule 7.02-1
<PAGE>

                                 SCHEDULE 7.03

                                   LITIGATION

     None

                                Schedule 7.03-1
<PAGE>

                                 SCHEDULE 7.09

                                     TAXES

     None

                                Schedule 7.09-1
<PAGE>

                                 SCHEDULE 7.10

                                  TITLES, ETC.

     None

                                Schedule 7.10-1
<PAGE>

                                 SCHEDULE 7.14

                                  SUBSIDIARIES

         ATP Oil & Gas (UK) Ltd.
         No. 1 Farnham Road
         Guildford, Surrey  GU2 4RG
         United Kingdom

         ATP Energy, Inc.
         4600 Post Oak Place
         Suite 200
         Houston, Texas 77027
         Telecopier No.:  (713) 622-5101
         Telephone No.:  (713) 622-3311

                                Schedule 7.14-1
<PAGE>

                                 SCHEDULE 7.17

                             ENVIRONMENTAL MATTERS

     None

                                Schedule 7.17-1
<PAGE>

                                 SCHEDULE 7.19

                                   INSURANCE

     See attached

                                Schedule 7.19-1
<PAGE>

                                 SCHEDULE 7.20

                               HEDGING AGREEMENTS

     See attached

                                Schedule 7.20-1
<PAGE>

                                 SCHEDULE 7.22

                              MATERIAL AGREEMENTS

          Refer to the attached Index to Exhibits to the Post-Effective
Amendment No. 1 to Form S-1 dated February 5, 2001 which are incorporated by
reference.

          Refer to the attached Index of Exhibits to the Form 10-K which are
incorporated by reference.

          Gas Marketing Agreement dated April, 1999 between Borrower and Aquila
Risk Management.

          Gas Marketing Agreement dated March 1, 1999, as amended May 24, 2000,
between the Borrower and Ashland Chemical Company.

                                Schedule 7.22-1
<PAGE>

                                 SCHEDULE 7.23

                                 GAS IMBALANCES

      None

                                Schedule 7.23-1
<PAGE>

                                 SCHEDULE 9.01

                                      DEBT

      All debt (including renewals and extensions thereof) as disclosed in the
Financial Statement as of December 31, 2000.

      Letter of credit in favor of Barclays Bank PLC, London, England issued by
The Chase Manhattan Bank in the amount of GBP 125,400.

                                Schedule 9.01-1
<PAGE>

                                 SCHEDULE 9.02

                                     LIENS

      None except as disclosed in the Financial Statements dated December 31,
2000.

                                Schedule 9.02-1
<PAGE>

                                 SCHEDULE 9.03

                        INVESTMENTS, LOANS AND ADVANCES

          1. $1,010,000 loan from ATP Energy to the Borrower.

          2. Loans from the Borrower to ATP (UK) of not more than $5,000,000 at
any one time outstanding as of the Closing Date and for a period of 30 days
thereafter.

                                Schedule 9.03-1

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