HOUSTON EXPLORATION CO
AMENDED AND RESTATED CREDIT AGREEMENT
<DOCUMENT>
<TYPE>EX-10.1
<SEQUENCE>2
<FILENAME>h15104exv10w1.txt
<DESCRIPTION>AMENDED AND RESTATED CREDIT AGREEMENT
<TEXT>
<PAGE>

                                                                    Exhibit 10.1

                      AMENDED AND RESTATED CREDIT AGREEMENT

                            Dated as of April 1, 2004

                                      Among

                        THE HOUSTON EXPLORATION COMPANY,
                                 as the Company;

     WACHOVIA BANK, NATIONAL ASSOCIATION, Individually, as Issuing Bank and
                            as Administrative Agent;

                             THE BANK OF NOVA SCOTIA
                                       and
                              FLEET NATIONAL BANK,
                            as Co-Syndication Agents;

                                   BNP PARIBAS
                                       and
                                 COMERICA BANK,
                           as Co-Documentation Agents;

                                       and

                          THE LENDERS SIGNATORY HERETO

                                      with

                          WACHOVIA CAPITAL MARKETS, LLC
                      as Lead Arranger and Sole Bookrunner

                     $400,000,000 Revolving Credit Facility

<PAGE>

                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                                                      Page
                                                                                                                      ----
<S>                                                                                                                   <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          Terms Generally.......................................................................       15
     Section 1.04          Accounting Terms and Determinations; GAAP.............................................       16

ARTICLE II COMMITMENTS...........................................................................................       16
     Section 2.01          Loans and Letters of Credit...........................................................       16
     Section 2.02          Borrowings, Continuations, Conversions, and Issuances.................................       17
     Section 2.03          Changes of Commitments................................................................       19
     Section 2.04          Fees..................................................................................       19
     Section 2.05          Applicable Lending Offices............................................................       21
     Section 2.06          Several Obligations...................................................................       21
     Section 2.07          Notes.................................................................................       21
     Section 2.08          Prepayments...........................................................................       21
     Section 2.09          Borrowing Base........................................................................       22

ARTICLE III PAYMENTS OF PRINCIPAL AND INTEREST...................................................................       24
     Section 3.01          Repayment of Loans....................................................................       24
     Section 3.02          Interest..............................................................................       25

ARTICLE IV PAYMENTS; PRO RATA TREATMENT; COMPUTATIONS; ETC.......................................................       25
     Section 4.01          Payments..............................................................................       25
     Section 4.02          Pro Rata Treatment....................................................................       26
     Section 4.03          Computations..........................................................................       26
     Section 4.04          Non-receipt of Funds by the Administrative Agent......................................       26
     Section 4.05          Sharing of Payments, Etc..............................................................       27
     Section 4.06          Assumption of Risks...................................................................       27
     Section 4.07          Obligation to Reimburse and to Repay..................................................       28
     Section 4.08          Obligations for Letters of Credit.....................................................       29

ARTICLE V YIELD PROTECTION; ILLEGALITY; TAXES; ETC...............................................................       30
     Section 5.01          Additional Costs......................................................................       30
     Section 5.02          Limitation on Types of Loans..........................................................       32
     Section 5.03          Illegality............................................................................       32
     Section 5.04          Certain Base Rate Loans pursuant to Sections 5.01 and 5.03............................       32
     Section 5.05          Certain Compensation..................................................................       32
     Section 5.06          Taxes.................................................................................       33
     Section 5.07          Mitigation Obligations; Replacement of Lenders........................................       34

ARTICLE VI CONDITIONS PRECEDENT..................................................................................       35
     Section 6.01          Initial Loans and Letters of Credit...................................................       35
     Section 6.02          Initial and Subsequent Loans and Letters of Credit....................................       36
</TABLE>

                                      -i-

<PAGE>

<TABLE>
<S>                                                                                                                     <C>
     Section 6.03          Conditions Relating to Letters of Credit..............................................       37
     Section 6.04          Subsequent Environmental Audits--New Acquisitions.....................................       37
     Section 6.05          Guarantors............................................................................       37

ARTICLE VII REPRESENTATIONS AND WARRANTIES.......................................................................       38
     Section 7.01          Corporate Existence...................................................................       38
     Section 7.02          Financial Condition...................................................................       39
     Section 7.03          Liabilities; Litigation...............................................................       39
     Section 7.04          No Breach.............................................................................       39
     Section 7.05          Corporate Action......................................................................       39
     Section 7.06          Approvals.............................................................................       40
     Section 7.07          Use of Loans..........................................................................       40
     Section 7.08          ERISA.................................................................................       40
     Section 7.09          Taxes.................................................................................       41
     Section 7.10          Titles, etc...........................................................................       41
     Section 7.11          No Material Misstatements.............................................................       42
     Section 7.12          Investment Company Act................................................................       42
     Section 7.13          Public Utility Holding Company Act....................................................       42
     Section 7.14          Subsidiaries and Partnerships.........................................................       42
     Section 7.15          Location of Business and Offices......................................................       42
     Section 7.16          Gas Imbalances........................................................................       42
     Section 7.17          Rate Filings..........................................................................       42
     Section 7.18          Environmental Matters.................................................................       43
     Section 7.19          Defaults..............................................................................       44
     Section 7.20          Compliance with the Law...............................................................       44
     Section 7.21          Insurance.............................................................................       44
     Section 7.22          Credit Agreements.....................................................................       44
     Section 7.23          Solvency..............................................................................       44
     Section 7.24          Restriction on Liens..................................................................       44

ARTICLE VIII AFFIRMATIVE COVENANTS...............................................................................       44
     Section 8.01          Financial Statements and Other Reports................................................       45
     Section 8.02          Litigation............................................................................       47
     Section 8.03          Corporate Existence, Etc..............................................................       47
     Section 8.04          Engineering and Other Reports.........................................................       48
     Section 8.05          Further Assurances....................................................................       49
     Section 8.06          Performance of Obligations............................................................       49

ARTICLE IX NEGATIVE COVENANTS....................................................................................       49
     Section 9.01          Debt..................................................................................       49
     Section 9.02          Guaranties, Etc.......................................................................       51
     Section 9.03          Liens.................................................................................       51
     Section 9.04          Leases................................................................................       53
     Section 9.05          Investments...........................................................................       53
     Section 9.06          Dividends.............................................................................       53
     Section 9.07          Sale of Assets........................................................................       54
     Section 9.08          Stock of Subsidiaries, Etc............................................................       54
</TABLE>

                                      -ii-

<PAGE>

<TABLE>
<S>                                                                                                                     <C>
     Section 9.09          Transactions with Affiliates..........................................................       54
     Section 9.10          Mergers, Etc..........................................................................       54
     Section 9.11          Intentionally Omitted.................................................................       54
     Section 9.12          Interest Coverage Ratio...............................................................       54
     Section 9.13          Funded Debt to EBITDA.................................................................       55
     Section 9.14          Negative Pledge Agreements............................................................       55
     Section 9.15          Sale of Oil and Gas Properties........................................................       55
     Section 9.16          Environmental Matters.................................................................       55
     Section 9.17          ERISA Compliance......................................................................       56
     Section 9.18          Hedging Agreements....................................................................       57
     Section 9.19          Subsidiaries and Partnerships.........................................................       57
     Section 9.20          Proceeds of Loans.....................................................................       57

ARTICLE X EVENTS OF DEFAULT......................................................................................       57
     Section 10.01         Events of Default.....................................................................       57
     Section 10.02         Cash Collateral for Letters of Credit.................................................       60

ARTICLE XI THE AGENTS............................................................................................       60
     Section 11.01         Appointment, Powers and Immunities....................................................       60
     Section 11.02         Reliance by Administrative Agent......................................................       61
     Section 11.03         Defaults..............................................................................       61
     Section 11.04         Rights as a Lender....................................................................       61
     Section 11.05         Indemnification.......................................................................       61
     Section 11.06         Non-Reliance on Administrative Agent and other Lenders................................       62
     Section 11.07         Failure to Act........................................................................       62
     Section 11.08         Resignation or Removal of Agents......................................................       62
     Section 11.09         The Syndication Agents and Documentation Agents.......................................       63

ARTICLE XII MISCELLANEOUS........................................................................................       63
     Section 12.01         Waiver................................................................................       63
     Section 12.02         Notices...............................................................................       63
     Section 12.03         Expenses, Indemnity; Damage Waiver....................................................       64
     Section 12.04         Amendments, Etc.......................................................................       67
     Section 12.05         Successors and Assigns................................................................       68
     Section 12.06         Assignments and Participations........................................................       68
     Section 12.07         Invalidity............................................................................       71
     Section 12.08         Counterparts..........................................................................       71
     Section 12.09         References............................................................................       71
     Section 12.10         Termination of Agreement; Survival of Obligations.....................................       71
     Section 12.11         Captions..............................................................................       72
     Section 12.12         Governing Law; Submission to Jurisdiction.............................................       72
     Section 12.13         Interest..............................................................................       72
     Section 12.14         Waiver of Jury Trial..................................................................       73
     Section 12.15         Right of Setoff.......................................................................       73
     Section 12.16         Existing Credit Agreement.............................................................       73
     Section 12.17         Exculpation Provisions................................................................       74
     Section 12.18         Confidentiality.......................................................................       74
</TABLE>

                                     -iii-

<PAGE>

<TABLE>
<S>                                                                                                                     <C>
     SECTION 12.19         NO ORAL AGREEMENTS....................................................................       75
     Section 12.20         USA Patriot Act Notice................................................................       75
</TABLE>

                             EXHIBITS AND SCHEDULES

Exhibit A - Form of Letter of Credit Agreement -- Issuing Bank
Exhibit B - Form of Revolving Credit Note
Exhibit C - Form of Compliance Certificate
Exhibit D - Form of Opinion
Exhibit E - Form of Borrowing, Continuation and Conversion Request Form
Exhibit F - Form of Assignment and Assumption
Exhibit G - Form of Guaranty Agreement

Schedule 1.02(b) - Existing Letters of Credit
Schedule 2.01    - Commitments
Schedule 7.03    - Litigation and Liabilities
Schedule 7.10    - Disclosure of Liens other than Excepted Liens
Schedule 7.14    - Listing of Subsidiaries and Partnerships
Schedule 7.16    - Gas Imbalances
Schedule 7.18    - Environmental Matters
Schedule 7.21    - Insurance
Schedule 7.22    - Credit Agreements, Etc.
Schedule 9.01    - Debt not reflected in Financial Statements
Schedule 9.05    -.Permitted Investments

                                      -iv-

<PAGE>

      THIS AMENDED AND RESTATED CREDIT AGREEMENT dated as of April 1, 2004, is
among THE HOUSTON EXPLORATION COMPANY, a corporation duly organized and validly
existing under the laws of the State of Delaware (the "Company"); each of the
financial institutions that is now or hereafter becomes a signatory hereto
(together with their respective successors or assigns, individually, a "Lender"
and, collectively, the "Lenders"); WACHOVIA BANK, NATIONAL ASSOCIATION,
Individually, as Issuing Bank and as Administrative Agent for the Lenders (in
such latter capacity, together with its successors in such capacity, the
"Administrative Agent"); THE BANK OF NOVA SCOTIA and FLEET NATIONAL BANK, as
Co-Syndication Agents (in such capacity, together with their respective
successors in such capacity, collectively the "Syndication Agents"); and BNP
PARIBAS and COMERICA BANK, as Co-Documentation Agents (in such capacity,
together with their successors in such capacity, collectively the "Documentation
Agents").

                                    RECITALS

      A.    The Company, the Administrative Agent, the Syndication Agents, BNP
PARIBAS, as Documentation Agent and certain of the Lenders are party to that
certain Credit Agreement dated as of July 15, 2002 (as heretofore amended, the
"Existing Credit Agreement").

      B.    The Company, the Administrative Agent and the Lenders mutually
desire to amend and restate the Existing Credit Agreement.

      NOW, THEREFORE, in consideration of the mutual covenants and agreements
herein contained and of the loans and commitments hereinafter referred to, the
parties hereto hereby agree that the Existing Credit Agreement is hereby amended
and restated in its entirety to read herein and as follows:

                                   ARTICLE I

                       Definitions and Accounting Matters

      Section 1.01 Terms Defined Above. As used in this Amended and Restated
Credit Agreement, the terms "Administrative Agent", "Company", "Documentation
Agents", "Existing Credit Agreement", "Lender", "Lenders" and "Syndication
Agents" 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 Amended and Restated Credit Agreement in the singular
to have the same meanings when used in the plural and vice versa):

      "Additional Costs" shall have the meaning assigned to that term in Section
5.01.

      "Administrative Questionnaire" shall mean an Administrative Questionnaire
in a form supplied by the Administrative Agent, to be completed by each Lender
and maintained at the offices of the Administrative Agent.

      "Affected Loans" shall have the meaning assigned to that term in Section
5.04.

                                      -1-

<PAGE>

      "Affiliate" of any Person shall mean (i) any Person directly or indirectly
Controlled by, Controlling or under common Control with such first Person, and
(ii) any director, officer, partner or stockholder of such first Person or of
any Person referred to in clause (i) above.

      "Agents" shall mean, collectively, the Administrative Agent, the
Syndication Agents and the Documentation Agents, and "Agent" shall mean either
the Administrative Agent, the Syndication Agents or the Documentation Agents, as
the context requires.

      "Agreement" shall mean this Amended and Restated Credit Agreement, as the
same may from time to time be amended or supplemented.

      "Alternate Reserve Report" shall have the meaning provided in Subsection
8.04(c).

      "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 in such Lender's Administrative Questionnaire
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 Company
as the office by which its Loans of such type are to be made and maintained.

      "Applicable Margin" shall mean, for any day, the applicable rate per annum
set forth below under the caption "Fixed Rate Loan Applicable Margin Percentage"
or "Base Rate Loan Applicable Margin Percentage", as the case may be, based upon
the Borrowing Base Utilization applicable on such date:

<TABLE>
<CAPTION>

          BORROWING BASE                     FIXED RATE LOAN APPLICABLE            BASE RATE LOAN APPLICABLE
           UTILIZATION                            MARGIN PERCENTAGE                     MARGIN PERCENTAGE
           -----------                            -----------------                     -----------------
<S>                                          <C>                                   <C>
Less than or equal to 33%                               1.25%                                    0%

Greater than 33% but less than or                       1.50%                                    0%
equal to 66%

Greater than 66% but less than or                       1.75%                                 0.25%
equal to 90%

Greater than 90%                                        2.00%                                 0.50%
</TABLE>

      "Applicable Percentage" shall mean, with respect to any Lender, the
percentage of the aggregate Commitments represented by such Lender's Commitment.
If the Commitments have terminated or expired, the Applicable Percentages shall
be determined based upon the aggregate Commitments most recently in effect.

      "Assignment and Assumption" shall mean an assignment and assumption
entered into by a Lender and an assignee (with the consent of any party whose
consent is required by Section 12.06), and accepted by the Administrative Agent,
in the form of Exhibit F or any other form approved by the Administrative Agent.

                                      -2-

<PAGE>

      "Base Rate" shall mean, with respect to any Base Rate Loan, for any day,
the higher of (a) the Federal Funds Rate for such day plus 1/2 of 1%, or (b) 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.

      "Borrowing Base" shall mean at any time an amount equal to the amount
determined as the Borrowing Base in accordance with Section 2.09.

      "Borrowing Base Utilization" shall mean, as of any day, the fraction
expressed as a percentage, the numerator of which is the sum of the aggregate
outstanding principal amount of Loans and LC Exposure on such day, and the
denominator of which is the lesser of (i) the Borrowing Base in effect on such
day, or (ii) the aggregate amount of the Commitments on such day.

      "Business Day" shall mean any day on which commercial banks are not
authorized or required to close in the State of Texas or in the State of North
Carolina and, where such term is used in the definition of "Quarterly Dates" in
this Section 1.02 or if such day relates to a borrowing of, a payment or
prepayment of principal of or interest on, or a conversion of or into, or the
Interest Period for, a Fixed Rate Loan or a notice by the Company with respect
to any such borrowing, 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.

      "Capital Lease" shall mean any lease which has been or should be
capitalized on the books of the lessee in accordance with GAAP.

      "Change in Control" shall mean any change in ownership of the shares of
stock of (a) THEC Holdings such that a Person (or group of Persons) other than
KeySpan or any of its wholly-owned Subsidiaries acquires shares of stock of THEC
Holdings, or (b) the Company such that a Person (or group of Persons) other than
KeySpan or any of its wholly-owned Subsidiaries acquires a direct or indirect
interest in more than 50% of the voting power of the voting stock of the
Company.

      "Closing Date" shall mean April 1, 2004.

      "Code" shall mean the Internal Revenue Code of 1986, as amended.

      "Commitment" shall mean, with respect to each Lender, the obligation of
such Lender to make Loans and to acquire participations in Letters of Credit
hereunder, in an aggregate amount at any one time outstanding equal to the
amount set forth opposite such Lender's name on Schedule 2.01, as such
commitment may be (a) reduced from time to time pursuant to Section 2.03 and (b)
reduced or increased from time to time pursuant to assignments by or to such
Lender pursuant to Section 12.06. The initial amount of each Lender's Commitment
is set forth on Schedule 2.01, or in the Assignment and Assumption pursuant to
which such Lender shall have assumed its Commitment, as applicable. The initial
aggregate amount of the Lenders' Commitments is $400,000,000; provided, however,
the total Commitments of all Lenders shall

                                      -3-

<PAGE>

be subject to the Borrowing Base pursuant to the terms of this Agreement
including, without limitation, Sections 2.01(a) and (b).

      "Consolidated Funded Debt" shall mean Funded Debt of the Company and its
Subsidiaries, as determined on a consolidated basis in accordance with GAAP.

      "Consolidated Net Income" shall mean, for any period, the amount which, in
conformity with GAAP, would be set forth opposite the caption "net income or
loss" (or any like caption) on a consolidated income statement of the Company
and its Subsidiaries for such period.

      "Consolidated Total Capitalization" shall mean the sum of (a) Consolidated
Funded Debt and (b) the total capital represented by the capital stock of the
Company at such time outstanding based, in the case of stock having a par value,
upon its par value, and, in the case of stock of no par value, upon the value
stated on the books of the Company, plus the total amount of paid-in capital
surplus and earned surplus of the Company (or minus the amount of any net
deficit in the surplus account of the Company), plus the amount of any premium
on capital stock of the Company not included in surplus, minus the amount, if
any, by which capital surplus has at any time been increased as a result of a
restatement of the amount at which any assets of the Company are recorded on the
books of the Company and minus non-cash charges related to the write-down of oil
and gas reserves that have not been previously reflected in the capital accounts
of the Company.

      "Control" shall mean the possession, directly or indirectly, of the power
to direct or cause the direction of the management or policies of a Person,
whether through the ability to exercise voting power, by contract or otherwise.
"Controlling" and "Controlled" have meanings correlative thereto.

      "Debt" shall mean, for any Person, the sum of the following (without
duplication): (a) all obligations of such Person for borrowed money or evidenced
by bonds, debentures, notes or other similar instruments; (b) all obligations of
such Person (whether contingent or otherwise) in respect of letters of credit,
bankers' acceptances, surety or other bonds and similar instruments; (c) all
obligations of such Person to pay the deferred purchase price of Property or
services, except trade accounts payable (other than for borrowed money) arising
in the ordinary course of business of such Person; (d) all obligations under
Capital Leases; (e) all Debt and other obligations secured by a Lien on any
asset of such Person, whether or not such Debt is assumed by such Person; (f)
guaranties of Debt of others, endorsements (other than for collection in the
ordinary course of business) and other contingent obligations to purchase, to
provide funds for payment, to supply funds to invest in any Person, or otherwise
to assure a creditor against loss; (g) all obligations or undertakings of such
Person to maintain or cause to be maintained the financial position or covenants
of other Persons; and (h) all obligations of such Person under or in connection
with Hedging Agreements once such obligations become "debt" according to GAAP.

      "Default" shall mean the occurrence of any 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.

                                      -4-

<PAGE>

      "Drawdown Termination Date" shall mean April 1, 2008, unless the
Commitment shall be sooner terminated pursuant to Section 2.03(a) or Section
10.01, or unless extended pursuant to Section 2.01(c).

      "EBITDA" shall mean, for any period, the sum of (1) Consolidated Net
Income for such period, plus (2) all interest expense to the extent deducted
from the calculation of Consolidated Net Income, plus (3) all income taxes to
the extent deducted from the calculation of Consolidated Net Income, plus (4)
all depreciation, depletion and amortization and other non-cash charges
(including any writedowns in the carrying value of the oil and gas assets
recorded in accordance with GAAP) to the extent deducted from the calculation of
Consolidated Net Income, plus (5) all asset retirement accretion expense to the
extent deducted from the calculation of Consolidated Net Income, plus (6) stock
compensation expense to the extent deducted from the calculation of Consolidated
Net Income, minus (7) all non-cash items of income to the extent added to the
calculation of Consolidated Net Income.

      "Engineering Reports" shall have the meaning assigned to that term in
Section 2.09(c).

      "Environmental Laws" shall mean any and all Governmental Requirements
pertaining in any way to health, safety, the environment or the preservation or
reclamation of natural resources, in effect in any and all jurisdictions in
which the Company or any Subsidiary is conducting or at any time has conducted
business, or where any Property of the Company or any Subsidiary is located, or
where any hazardous substances generated by or disposed of by the Company or any
Subsidiary are located, including without limitation, the Oil Pollution Act of
1990 ("OPA"), as amended, 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 Governmental Requirements. 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, the terms "solid waste" and
"disposal" (or "disposed") have the meanings specified in RCRA and the term "oil
and gas waste" shall have the meaning specified in Section 91.1011 of the Texas
Natural Resources Code ("Section 91.1011"); provided, however, that (a) in the
event either OPA, CERCLA, RCRA or Section 91.1011 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 (b) to the extent the
laws of the state or other jurisdiction in which any Property of the Company or
any Subsidiary is located establish a meaning for "oil," "hazardous substance,"
"release," "solid waste," "disposal" or "oil and gas waste" which is broader
than that specified in either OPA, CERCLA, RCRA or Section 91.1011, such broader
meaning shall apply.

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

                                      -5-

<PAGE>

      "ERISA Affiliate" shall mean any trade or business (whether or not
incorporated) that, together with the Company, is treated as a single employer
under Section 414(b) or (c) of the Code or, solely for purposes of Section 302
of ERISA and Section 412 of the Code, is treated as a single employer under
Section 414 of the Code.

      "ERISA Event" shall mean (a) a "Reportable Event" described in section
4043 of ERISA and the regulations issued thereunder for which the notice
requirement has not been waived pursuant to regulations issued by the PBGC, (b)
the withdrawal of the Company, a 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, (c) the filing of a notice of intent to terminate a
Plan under section 4041(c) of ERISA or the treatment of a Plan amendment as a
termination under section 4041 of ERISA, (d) the institution of proceedings to
terminate a Plan by the PBGC 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 Plan.

      "Event of Default" shall have the meaning assigned to that term in Article
X.

      "Excepted Liens" shall mean: (i) Liens for taxes, assessments or other
governmental charges or levies not yet due and payable or, if due and payable,
being contested in good faith by appropriate action and for which appropriate
reserves are 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; (iii) operator's, 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 of the Company and its Subsidiaries and statutory landlord's liens in
respect of obligations none of which shall remain unpaid more than 90 days or
which are being contested in good faith by appropriate proceedings; (iv) any
Liens securing indebtedness, neither assumed nor guaranteed by the Company or
any Subsidiary nor on which the Company or any Subsidiary pays interest,
existing upon real estate or rights in or relating to real estate acquired by
the Company or any Subsidiary for substation, metering station, pump station,
storage, gathering line, transmission line, transportation line, distribution
line or right of way purposes, and any Liens reserved in leases for rent and for
compliance with the terms of the leases in the case of leasehold estates, to the
extent that any such Lien referred to in this clause (iv) does not materially
impair the use of the Property covered by such Lien for the purposes for which
such Property is held by the Company or a Subsidiary; and (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 Company or its Subsidiaries 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 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 Company or a Subsidiary.

                                      -6-

<PAGE>

      "Excluded Taxes" shall mean, with respect to the Administrative Agent, any
Lender, the Issuing Bank or any other recipient of any payment to be made by or
on account of any obligation of the Company hereunder, (a) income or franchise
taxes imposed on (or measured by) its net income by the United States of
America, or by the jurisdiction under the laws of which such recipient is
organized or in which its principal office is located or, in the case of any
Lender, in which its applicable lending office is located, (b) any branch
profits taxes imposed by the United States of America or any similar tax imposed
by any other jurisdiction in which the Company is located and (c) in the case of
a Foreign Lender (other than an assignee pursuant to a request by the Company
under Section 5.07(b)), any withholding tax that is imposed on amounts payable
to such Foreign Lender at the time such Foreign Lender becomes a party to this
Agreement (or designates a new lending office) or is attributable to such
Foreign Lender's failure to comply with Section 5.06(e), except to the extent
that such Foreign Lender (or its assignor, if any) was entitled, at the time of
designation of a new lending office (or assignment), to receive additional
amounts from the Company with respect to such withholding tax pursuant to
Section 5.06(a).

      "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 members of the Federal
Reserve System arranged by Federal funds brokers on such day, as published by
the Federal Reserve Bank of Dallas 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 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 Wachovia Bank, National Association on such day on such
transactions as determined by the Administrative Agent.

      "Financial Statements" shall mean the financial statement or statements of
the Company described or referred to in Section 7.02.

      "Fixed Base Rate" shall mean, with respect to any Fixed Rate Loan for any
Interest Period, the rate appearing on Page 3750 of the Bridge Telerate Service
(formerly Dow Jones Market Service) (or on any successor or substitute page of
such Service, or any successor to or substitute for such Service, providing rate
quotations comparable to those currently provided on such page of such Service,
as determined by the Administrative Agent from time to time for purposes of
providing quotations of interest rates applicable to dollar deposits in the
London interbank market) at approximately 11:00 a.m., London time, two Business
Days prior to the commencement of such Interest Period, as the rate for dollar
deposits with a maturity comparable to such Interest Period. In the event that
such rate is not available at such time for any reason, then the "Fixed Base
Rate" with respect to such Fixed Rate Loan for such Interest Period shall be the
rate at which dollar deposits of $5,000,000 and for a maturity comparable to
such Interest Period are offered by the principal London office of the
Administrative Agent in immediately available funds in the London interbank
market at approximately 11:00 a.m., London time, two Business Days prior to the
commencement of such Interest Period.

      "Fixed Rate" shall mean, for any Fixed Rate Loan, a rate per annum
(rounded upwards, if necessary, to the nearest 1/16th of 1%) determined by the
Administrative Agent to be equal to the

                                      -7-

<PAGE>

quotient of (i) the Fixed Base Rate for such Loan for the Interest Period
therefor, divided by (ii) one minus the Reserve Requirement for such Loan for
such Interest Period.

      "Fixed Rate Loans" shall mean any Loan when and to the extent the interest
rate therefor is determined on the basis of rates referred to in the definition
of "Fixed Base Rate".

      "Foreign Lender" shall mean any Lender that is organized under the laws of
a jurisdiction other than that in which the Company is located. For purposes of
this definition, the United States of America, each State thereof and the
District of Columbia shall be deemed to constitute a single jurisdiction.

      "Funded Debt" means (a) all Debt for money borrowed or for the purchase
price of Property, (b) trade Debt incurred in the ordinary course of business
which is not paid when due, (c) liabilities under any bond, note, security,
letter of credit (other than Letters of Credit issued for trade credit but
including Letters of Credit issued as performance guarantees), acceptance
facility, or similar agreement, (d) Capital Lease obligations, and (e) all
obligations under or in connection with Hedging Agreements once such obligations
become "debt" according to GAAP.

      "GAAP" shall mean generally accepted accounting principles in the United
States of America as in effect from time to time, applied on a basis consistent
with those used in the preparation of the Financial Statements (except for
changes concurred in by the Company's independent public accountants).

      "Governmental Authority" shall include the United States, the state,
county, parish, province, municipal and political subdivisions in which any
Property of the Company or any Subsidiary is located or which exercises
jurisdiction over any such Property, and any court, agency, department,
commission, board, bureau or instrumentality of any of them which exercises
jurisdiction over any such Property.

      "Governmental Requirement" shall mean any law, statute, code, ordinance,
order, rule, regulation, judgment, decree, injunction, franchise, permit,
certificate, license, authorization or other direction or requirement
(including, without limitation, Environmental Laws, energy regulations and
occupational, safety and health standards or controls) of any Governmental
Authority.

      "Guarantors" shall mean each Significant Subsidiary, if any, which may
execute a Guaranty Agreement after the date hereof pursuant to Section 9.19
hereof.

      "Guaranty Agreements" shall mean the guaranty agreements, if any, dated as
of the date of their respective execution, executed by each of the Guarantors
after the date hereof pursuant to Section 9.19 and being in form of Exhibit G,
as same may be amended from time to time, guaranteeing prompt payment and/or
performance of the Indebtedness.

      "Hedging Agreement" shall mean (i) any interest or currency rate swap,
rate cap, rate floor, rate collar, exchange transaction, put or call option,
forward agreement, foreign exchange or other exchange or rate protection
agreement or any option with respect to any such transaction and (ii) any cap,
floor, collar, exchange transaction, contract for sale for future delivery of
oil or gas (whether or not the subject oil or gas is to be delivered), hedging
contract, forward contract,

                                      -8-

<PAGE>

swap agreement, futures contract, call or put option or any other similar
agreement or other exchange or protection agreement relating to Hydrocarbons or
any option with respect to any such transaction (whether or not any of the
foregoing contemplates physical deliveries or only financial contracts).

      "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 other
Indebtedness under laws applicable to such Lender which are presently in effect
or, to the extent allowed by law, under 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 owned 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 reserve or residual interest of
whatever nature.

      "Hydrocarbons" shall mean oil, gas, casinghead gas, drip gasoline, natural
gasoline, condensate, distillate, liquid hydrocarbons, gaseous hydrocarbons and
all products refined therefrom and all other minerals customarily produced in
association therewith.

      "Indebtedness" shall mean (i) any and all amounts owing or to be owing by
the Company to the Administrative Agent and/or the Lenders in connection with
the Notes, any Letter of Credit or Letter of Credit Agreement, any Security
Instrument, including this Agreement, or any Hedging Agreement (to the extent of
net obligations owed in connection therewith), between the Company and the
Administrative Agent or any Lender or any Affiliate of any Lender, and (ii) all
renewals, extensions, replacements, amendments and/or rearrangements thereof.

      "Indemnified Taxes" shall mean Taxes other than Excluded Taxes.

      "Indenture" shall mean that certain Indenture dated as of June 5, 2003, by
and between the Company and The Bank of New York, as Trustee, pursuant to which
the Company issued the Senior Subordinated Notes, as the same may from time to
time be amended or supplemented and as otherwise permitted by the terms of this
Agreement including, without limitation, the provisions of Section 9.01(m).

      "Initial Funding" shall mean the funding of the initial Loans pursuant to
Section 6.01 hereof.

      "Initial Reserve Report" shall mean, collectively, the reports of
Netherland, Sewell and Associates dated as of December 31, 2003, and Miller &
Lents dated December 31, 2003, with respect to Oil and Gas Properties of the
Company, a copy of which has been delivered to the Lenders.

      "Interest Coverage Ratio" shall have the meaning assigned to that term in
Section 9.12.

                                      -9-

<PAGE>

      "Interest Period" shall mean the period commencing on the date a Loan is
made and ending, as the Company may select pursuant to Section 2.02: (a) in the
case of Base Rate Loans, on the next succeeding Quarterly Date; and (b) in the
case of Fixed Rate Loans, on the numerically corresponding day in the first,
second, third, or sixth calendar month thereafter, or such other date as the
Company and the Administrative Agent shall agree, provided that each such
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 calendar month. Notwithstanding the foregoing: (i) no Interest
Period may commence before and end after the scheduled maturity of the Notes;
(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 the next succeeding calendar month, on the next
preceding Business Day); and (iii) no Interest Period on Fixed Rate Loans shall
have a duration of less than one month.

      "Interim Redetermination" shall have the meaning assigned to that term in
Section 2.09(b).

      "Issuing Bank" shall mean Wachovia Bank, National Association, in its
capacity as the issuer of Letters of Credit hereunder or such other Lender as
may hereinafter be designated as an Issuing Bank pursuant to the terms hereof.
The Issuing Bank may, in its discretion, arrange for one or more Letters of
Credit to be issued by Affiliates of the Issuing Bank, in which case the term
"Issuing Bank" shall include any such Affiliate with respect to Letters of
Credit issued by such Affiliate.

      "KeySpan" shall mean KeySpan Corporation, a New York corporation, the
indirect parent of the Company.

      "LC Exposure" shall mean at any time the aggregate undrawn face amount of
all outstanding Letters of Credit and the aggregate of all amounts drawn under
Letters of Credit and not yet reimbursed or funded as a Loan pursuant to Section
4.07(b).

      "Letter of Credit Agreements" shall mean the written agreements between
the Company and the Issuing Bank executed or hereafter executed in connection
with the issuance by the Issuing Bank of the Letters of Credit, such agreements
to be in substantially the form attached hereto as Exhibit A, or on any other
customary form for letters of credit of comparable amount and purpose, as from
time to time agreed to by the Company and the Issuing Bank.

      "Letters of Credit" shall mean (i) the letters of credit outstanding on
the Closing Date and described on Schedule 1.02(b) hereof, together with all
renewals, replacements, extensions and substitutions thereof, (ii) the letters
of credit hereafter issued by the Issuing Bank on behalf of the Lenders pursuant
to Section 2.01(b), and (iii) 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 obligation pertaining thereto.

      "Liens" shall mean, with respect to any asset, any mortgage, lien, pledge,
charge (including, without limitation, production payments and the like payable
out of Oil and Gas Properties), security interest or encumbrance of any kind in
respect of such asset. For the

                                      -10-

<PAGE>

purposes of this Agreement, the Company and the Subsidiaries shall be deemed to
own subject to a Lien any asset which they have acquired or hold subject to the
interest of a vendor or lessor under any conditional sale agreement, Capital
Lease or other title retention agreement relating to such asset.

      "Loans" shall mean the Revolving Credit Loans.

      "Material Adverse Effect" shall mean any material and adverse effect on
(i) the assets, liabilities, financial condition, business, operations, affairs
or circumstances of the Company and its Subsidiaries on a combined basis
reflected in the Financial Statements or the facts as represented or warranted
in this Agreement or any other Security Instrument, or (ii) the ability of the
Company and its Subsidiaries on a combined basis to carry out their respective
business as at the date of this Agreement or as proposed at the date of this
Agreement to be conducted or meet their respective obligations under the Notes,
the Letters of Credit and Letter of Credit Agreements, this Agreement or the
other Security Instruments on a timely basis.

      "Material Change" shall mean a Change in Control.

      "Multiemployer Plan" shall mean a "multiemployer plan" as defined in
Section 3(37) of ERISA to which contributions have been made by the Company or
any ERISA Affiliate and which is covered by Title IV of ERISA.

      "New Borrowing Base Notice" shall have the meaning assigned to that term
in Section 2.09(d).

      "Notes" shall mean the Revolving Credit Notes.

      "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 body or agency
having jurisdiction) 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, the lands covered thereby and all oil
in tanks and all rents, issues, profits, proceeds, products, revenues and other
income from or attributable to the Hydrocarbon Interests; all tenements,
hereditaments, appurtenances and Properties in anywise appertaining, belonging,
affixed or incidental to the Hydrocarbon Interests, Properties, rights, titles,
interests and estates described or referred to above, including any and all
Property, real or personal, now owned or hereinafter acquired and situated upon,
used, held for use or useful in connection with the operating, working 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 similar 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

                                      -11-

<PAGE>

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.

      "Other Taxes" shall mean any and all present or future stamp or
documentary taxes or any other excise or property taxes, charges or similar
levies arising from any payment made hereunder or from the execution, delivery
or enforcement of, or otherwise with respect to, this Agreement and any other
Security Instrument.

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

      "Person" shall mean any natural person, corporation, company, voluntary
association, partnership, limited liability company, joint venture, trust,
unincorporated organization or government or any agency, instrumentality or
political subdivision thereof, or any other form of entity.

      "Phase I Audit" shall mean an inspection of Property and an evaluation of
operations conducted thereon of a scope and in such detail as would be conducted
by a reasonably prudent purchaser, lender, or investor in light of all relevant
facts and circumstances to identify adverse environmental conditions or
violations of Environmental Laws that would subject a past, present, or future
owner or operator of such Property to liabilities under applicable Environmental
Laws as a result of such environmental conditions and/or violations of
Environmental Laws; provided, however, that the scope and detail of the
inspection and evaluation shall be no less extensive than the minimum standards
set forth in the most recent version of ASTM Standard E 1527, as adopted by the
American Society for Testing and Materials.

      "Plan" shall mean any employee pension benefit plan (other than a
Multiemployer Plan) subject to the provisions of Title IV of ERISA or Section
412 of the Code or Section 302 of ERISA, and in respect of which the Company or
any Subsidiary is (or, if such plan were terminated, would under Section 4069 of
ERISA be deemed to be) an "employer" as defined in Section 3(5) of ERISA.

      "Post-Default Rate" shall mean, with respect to the principal of any Loan
and, to the extent permitted by law, any other amount payable by the Company
under this Agreement or any Note or any Letter of Credit Agreement that is not
paid when due (whether at stated maturity, by acceleration or otherwise), a rate
per annum during the period from and including the due date, to, but excluding
the date on which such amount is paid in full equal to 2% above the Base Rate as
in effect from time to time plus the Applicable Margin (if any) (provided that,
if the amount so in default is principal of a Fixed Rate Loan and the due date
thereof is a day other than the last day of the Interest Period therefor, the
"Post-Default Rate" for such principal shall be, for the period from and
including the due date and to but excluding the last day of the Interest Period
therefor, 2% above the interest rate for such Loan as provided in Section 3.02
hereof and, thereafter, the rate provided for above in this definition).

                                      -12-

<PAGE>

      "Prime Rate" shall mean the rate of interest per annum publicly announced
from time to time by Wachovia Bank, National Association as its prime rate in
effect at its principal office in Charlotte, North Carolina; each change in the
Prime Rate shall be effective from and including the date such change is
publicly announced as being effective. Such rate is set by Wachovia Bank,
National Association as a general reference rate of interest, taking into
account such factors as Wachovia Bank, National Association may deem
appropriate; it being understood that many of the Wachovia Bank, National
Association'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 Wachovia Bank, National Association 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 and Wachovia Bank, National Association, presently located at 301 South
College Street, Charlotte, North Carolina 28288-0608.

      "Property" shall mean any interest in any kind of property or asset,
whether real, personal or mixed, or tangible or intangible.

      "Proposed Borrowing Base" shall have the meaning assigned to that term in
Section 2.09(c).

      "Proposed Borrowing Base Notice" shall have the meaning assigned to that
term in Section 2.09(c)(ii).

      "PUHCA" shall have the meaning assigned to that term in Section 7.13.

      "Quarterly Dates" shall mean the last day of each March, June, September,
and December in each year, the first of which shall be the first such day after
the Closing Date; provided that if any such day is not a Business Day, then such
Quarterly Date shall be the next preceding Business Day.

      "Redetermination Date" shall mean, with respect to any Scheduled
Redetermination or any Interim Redetermination, the date that the redetermined
Borrowing Base related thereto becomes effective pursuant to Section 2.09(d).

      "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 date of this Agreement in United States Federal, state or foreign law
or regulations (including Regulation D) or the adoption or making after such
date of any interpretations, directives or requests applying to a class of
lenders or insurance companies (including such Lender or its Applicable Lending
Office) of or under any United States Federal, state or foreign law or
regulations (whether or not having the force of law) by any court or
governmental or monetary authority charged with the interpretation or
administration thereof.

                                      -13-

<PAGE>

      "Related Parties" shall mean, with respect to any specified Person, such
Person's Affiliates and the respective directors, officers, employees, agents
and advisors of such Person and such Person's Affiliates.

      "Required Lenders" shall mean, at any time, Lenders having at least
sixty-six and two thirds percent (66 2/3%) of the aggregate principal amount of
all outstanding Loans or, if no Loans are outstanding, of the aggregate amount
of the Commitments.

      "Required Payment" shall have the meaning assigned to that term in Section
4.04.

      "Reserve Report" shall have the meaning assigned to that term in Section
8.04(a).

      "Reserve Requirement" shall mean, for any Interest Period for any Fixed
Rate Loan, the average maximum rate at which reserves (including any marginal,
supplemental or emergency reserves) are required to be maintained during the
Interest Period for such Loan under Regulation D by member banks of the Federal
Reserve System in Dallas with deposits exceeding $1,000,000,000 against
"Eurocurrency liabilities" (as such term is used in Regulation D). Without
limiting the effect of the foregoing, the Reserve Requirement shall also 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 the Fixed Base Rate for Fixed Rate Loans is to be
determined as provided in the definition of "Fixed Base Rate" in this Section
1.02, or (ii) any category of extensions of credit or other assets which include
Fixed Rate Loans.

      "Revolving Credit Loans" shall mean the revolving credit loans as provided
for by Section 2.01(a).

      "Revolving Credit Notes" shall mean the promissory notes of the Company
provided for in Section 2.07 and being in the form of Exhibit B hereto, together
with any and all renewals, extensions for any period, increases or
rearrangements thereof.

      "Scheduled Redetermination" shall have the meaning assigned to that term
in Section 2.09(b).

      "Security Instruments" shall mean this Agreement, the Notes, the Letter of
Credit Agreements, the Guaranty Agreements, and any and all other agreements or
instruments now or hereafter executed and delivered by the Company, a Subsidiary
or any other Person (other than participation or similar agreements between any
Lender and any other bank or creditor with respect to any Indebtedness pursuant
to this Agreement) in connection with, or as security for the payment or
performance of, the Notes, any Letter of Credit or Letter of Credit Agreement,
the Guaranty Agreements, or this Agreement, as such instruments or agreements
may be amended or supplemented from time to time.

      "Senior Subordinated Notes" shall mean the 7% Senior Subordinated Notes of
the Company due 2013, issued pursuant to the Indenture, as the same may from
time to time be renewed, rearranged, modified, increased or replaced and as
otherwise permitted by the terms of this Agreement including, without
limitation, the provisions of Section 9.01(j).

                                      -14-

<PAGE>

      "Significant Subsidiary" shall mean a "significant subsidiary" as defined
in Section 1-02(w) of Regulation S-X under the Securities and Exchange Act of
1934, as amended.

      "Solvent" shall mean with respect to any Person on a particular date, the
condition that, on such date, (a) the fair value of the Property of such Person
is greater than the total amount of liabilities, including, without limitation,
contingent liabilities, of such Person, (b) the present fair salable value of
the assets of such Person is not less than the amount that will be required to
pay the probable liability of such Person on its debts as they become absolute
and matured, (c) such Person does not intend to, and does not believe that it
will, incur debts or liabilities beyond such Person's ability to pay as such
debts and liabilities mature, and (d) such Person is not engaged in business or
a transaction, and is not about to engage in business or a transaction, for
which such Person's Property would constitute an unreasonably small amount of
capital.

      "Subsidiary" shall mean any corporation, partnership, joint venture or
other entity of which at least a majority of the outstanding shares of stock or
other equity interests having by the terms thereof ordinary voting power or
economic interests to elect a majority of the board of directors or other
managers of such corporation, partnership, joint venture or other entity
(irrespective of whether or not at the time stock or other equity interests of
any other class or classes of such corporation, partnership, joint venture or
other entity 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
the Company or one or more of the Subsidiaries, or by the Company and one or
more of the Subsidiaries.

      "Taxes" shall mean any and all present or future taxes, levies, imposts,
duties, deductions, charges or withholdings imposed by any Governmental
Authority.

      "THEC Holdings" shall mean THEC Holdings Corp., a Delaware corporation.

      Section 1.03 Terms Generally. The definitions of terms herein shall apply
equally to the singular and plural forms of the terms defined. Whenever the
context may require, any pronoun shall include the corresponding masculine,
feminine and neuter forms. The words "include", "includes" and "including" shall
be deemed to be followed by the phrase "without limitation". The word "will"
shall be construed to have the same meaning and effect as the word "shall".
Unless the context requires otherwise (a) any definition of or reference to any
agreement, instrument or other document herein shall be construed as referring
to such agreement, instrument or other document as from time to time amended,
supplemented or otherwise modified (subject to any restrictions on such
amendments, supplements or modifications set forth herein), (b) any reference
herein to any Person shall be construed to include such Person's successors and
assigns, (c) the words "herein", "hereof" and "hereunder", and words of similar
import, shall be construed to refer to this Agreement in its entirety and not to
any particular provision hereof, (d) all references herein to Articles,
Sections, Annexes, Exhibits and Schedules shall be construed to refer to
Articles and Sections of, and Annexes, Exhibits and Schedules to, this Agreement
and (e) the words "asset" and "property" shall be construed to have the same
meaning and effect and to refer to any and all tangible and intangible assets
and properties, including cash, securities, accounts and contact rights.

                                      -15-

<PAGE>

      Section 1.04 Accounting Terms and Determinations; GAAP. 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 Financial Statements except for changes in which the Company's independent
certified public accountants concur and which are disclosed to Administrative
Agent on the next date on which financial statements are required to be
delivered to the Lenders pursuant to Section 8.01; provided that, unless the
Company and the Required Lenders shall otherwise agree in writing, no such
change shall modify or affect the manner in which compliance with the covenants
contained herein is computed such that all such computations shall be conducted
utilizing financial information presented consistently with prior periods.

                                   ARTICLE II

                                   Commitments

      Section 2.01 Loans and Letters of Credit. Each Lender severally agrees, on
the terms of this Agreement, to make the following Loans to the Company, and the
Issuing Bank on behalf of the Lenders agrees to issue, reissue, renew and extend
Letters of Credit for the account of the Company in accordance with the
following:

            (a)   Revolving Credit Loans - during the period from and including
the Closing Date to and including the Drawdown Termination Date, Revolving
Credit Loans 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 Revolving Credit
Loans made by all Lenders hereunder at any one time outstanding shall not
exceed, in the aggregate (A) the lesser of (1) the Borrowing Base or (2) the
aggregate Commitments, as then in effect, minus (B) the sum of (1) the LC
Exposure and (2) the utilization of performance bonds in excess of $5,000,000
pursuant to Section 9.01(g). Subject to the terms of this Agreement, during the
period from the Closing Date to and including the Drawdown Termination Date, the
Company may borrow, repay and reborrow the amount of the Commitments, as then in
effect.

Subject to the other terms and provisions of this Agreement, at the option of
the Company unless otherwise provided herein, the Loans may be Base Rate Loans
or Fixed Rate Loans (each a "type" of Loan). For purposes of this Section
2.01(a), Fixed Rate Loans having different Interest Periods, regardless of
whether they commence on the same date, shall be considered separate Loans.
Borrowings of more than one type of Loan may be outstanding at the same time;
provided that there shall not at any time be more than a total of five (5) Fixed
Rate Loans outstanding.

            (b)   Letters of Credit:

                  (i)   During the period from and including the Closing Date to
and including the Drawdown Termination Date, the Lenders agree to extend credit
to the Company at any time and from time to time by participating in the
issuance, renewal, extension or reissuance

                                      -16-

<PAGE>

of Letters of Credit pursuant to this Agreement; provided, that all such Letters
of Credit issued on or after the Closing Date shall be issued by the Issuing
Bank; and further provided, however, the aggregate amount of all Letters of
Credit at any one time outstanding shall not exceed (A) the lesser of (1)
$40,000,000, or (2) the lesser of (x) the Borrowing Base, or (y) the aggregate
Commitments, as then in effect, minus (B) the aggregate principal amount of all
Loans then outstanding.

                  (ii)  Each of the Letters of Credit issued after the Closing
Date shall (A) be issued by the Issuing Bank, (B) contain such terms and
provisions as are required by the Letter of Credit Agreement executed in
connection therewith and (to the extent not in conflict with the Letter of
Credit Agreement) those then customarily used by the Issuing Bank in letters of
credit, (C) be for the account of the Company, (D) be issued to support trade
payables and performance guarantees, and (E) expire not later than the Drawdown
Termination Date.

                  (iii) In conjunction with the issuance of a Letter of Credit,
the Company 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 Company, the Issuing Bank, the Administrative Agent and the
Lenders hereby agree that the provisions of this Agreement shall govern.

            (c)   Extensions. With the unanimous written consent of the Lenders,
which may or may not be granted in the discretion of the Lenders, the Company
may, on an annual basis, obtain one year extensions of the Drawdown Termination
Date by delivering a written request for same to the Administrative Agent not
more than four (4) months and not less than sixty (60) days prior to the
Drawdown Termination Date.

      Section 2.02 Borrowings, Continuations, Conversions, and Issuances.

            (a)   The Company shall give the Administrative Agent (which shall
promptly notify the Lenders) advance notice as hereinafter provided of each
borrowing, continuation, and conversion and each request for issuance, renewal,
extension or reissuance of a Letter of Credit hereunder which request shall be
in the form of Exhibit E hereto, which shall specify the aggregate amount of
such Loan or such Letter of Credit, the date (which shall be a Business Day) of
the Loans to be borrowed, continued or converted, or the Letters of Credit to be
issued, renewed, extended or reissued, the type of Loan to be borrowed,
continued or converted, the beneficiary and other terms of such Letter of
Credit, and in the case of Fixed Rate Loans, the duration of the Interest Period
therefor, all of which (other than the beneficiary) must not conflict with the
other terms and provisions of this Agreement.

            (b)   All Base Rate Loans (as part of the same borrowing) shall be
in aggregate amounts among all Lenders of at least $1,000,000 (or increments of
$1,000,000 in excess thereof) or the remaining unused portion of the
Commitments, or the amount disbursed under a Letter of Credit and advanced
hereunder pursuant to Section 4.07(b) hereof, if less. All Fixed Rate Loans (as
part of the same borrowing) shall be in aggregate amounts among all Lenders of
at least $1,000,000 (or increments of $1,000,000 in excess thereof).

                                      -17-

<PAGE>

            (c)   All borrowings, continuations and conversions of Loans, or
requests for issuance, renewal, extension or reissuance of Letters of Credit
shall require advance written notice from the Company to the Administrative
Agent, which in each case (other than the issuance, renewal, extension or
reissuance of Letters of Credit) shall be irrevocable and effective only upon
receipt by the Administrative Agent and shall be received by the Administrative
Agent not later than 12:00 noon Charlotte, North Carolina time on a day which is
not less than the number of Business Days prior to the date of such borrowing,
continuation or conversion specified below opposite the type of such Loans:

<TABLE>
<CAPTION>
                           Number of
      Type               Business Days
      ----               -------------
<S>                      <C>
Base Rate Loans                0
Fixed Rate Loans               3
</TABLE>

and four (4) Business Days prior to the date such Letter of Credit is to be
issued, renewed, extended or reissued.

            (d)   Not later than 2:00 p.m. Charlotte, North Carolina time on the
date specified for each borrowing hereunder, each Lender shall make available in
immediately available funds the amount of the Loan to be made by such Lender on
such date to the Administrative Agent, to an account which the Administrative
Agent shall specify for the account of the Company. The amounts so received by
the Administrative Agent shall, subject to the terms and conditions of this
Agreement, be made available to the Company by depositing the same, in
immediately available funds, in an account of the Company designated by the
Company and maintained with Wachovia Bank, National Association at the Principal
Office.

            (e)   On the date specified for the issuance, renewal or extension
of a Letter of Credit, the Issuing Bank shall issue such Letter of Credit to the
beneficiary thereof.

            (f)   Subject to the terms of this Agreement, the Company may elect
to continue all or any part of any Fixed Rate Loan beyond the expiration of the
then current Interest Period relating thereto by giving advance notice to the
Administrative Agent 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 in accordance with the terms of Section 2.02(a) and (c), the
Company shall be deemed to have elected to convert such Fixed Rate Loan to a
Base Rate Loan. All or any part of any Fixed Rate 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 the
principal amount of at least $1,000,000 (or increments of $1,000,000 in excess
thereof), and (ii) no Event of Default shall have occurred and be continuing. If
an Event of Default shall have occurred and be continuing, each Fixed Rate Loan
shall be converted to a Base Rate Loan on the last day of the Interest Period
applicable thereto.

            (g)   Subject to the terms of this Agreement:

                                      -18-

<PAGE>

                  (i)   The Company may elect to convert any Fixed Rate 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 of such election.

                  (ii)  The Company may elect to convert all or any part of a
Base Rate Loan at any time and from time to time to a Fixed Rate Loan by giving
advance notice to the Administrative Agent of such election. All or any part of
any outstanding Loan may be converted as provided herein, provided that any
conversion of any Base Rate Loan into a Fixed Rate Loan shall be (as to each
such Loan into which there is a conversion for an applicable Interest Period) in
the principal amount not less than $1,000,000. If no Event of Default shall have
occurred and be continuing, each Loan may be converted as provided in this
Section. If an Event of Default shall have occurred and be continuing, no Loan
may be converted into a Fixed Rate Loan.

      Section 2.03 Changes of Commitments.

            (a)   The Company shall have the right to terminate or to reduce the
amount of the Commitments at any time or from time to time upon not less than
three (3) Business Day's prior written 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 increment of
$5,000,000 in excess thereof) and shall be irrevocable and effective only upon
receipt by the Administrative Agent.

            (b)   The Commitments once terminated or reduced may not be
reinstated.

            (c)   The Company shall have the right, without the consent of the
Lenders but with the prior approval of the Administrative Agent, not to be
unreasonably withheld, to cause from time to time an increase in the aggregate
Commitments of the Lenders by adding to this Agreement one or more additional
Lenders or by allowing one or more Lenders to increase their respective
Commitments; provided however (i) no Event of Default shall have occurred
hereunder which is continuing, (ii) no such increase shall result in the
aggregate Commitments hereunder to exceed $450,000,000, and (iii) no Lender's
Commitment shall be increased without such Lender's consent.

      Section 2.04 Fees.

            (a)   The Company agrees to pay to the Administrative Agent, for the
account of each Lender, a commitment fee on the daily average of the amount by
which the Borrowing Base exceeds the sum of (A) the LC Exposure, plus (B) the
aggregate principal amount of all outstanding Loans, for the period from and
including the last Borrowing Base determination date to the earlier of the date
the Commitments are terminated or the date of the next effective Borrowing Base
determination date at the following rate per annum as applicable:

                                      -19-

<PAGE>

<TABLE>
<CAPTION>
              BORROWING BASE
                UTILIZATION                             COMMITMENT FEE
                -----------                             --------------
<S>                                                     <C>
Less than or equal to 33%                                    0.30%
Greater than 33% but less than or equal to 66%              0.375%
Greater than 66% but less than or equal to 90%               0.50%
Greater than 90%                                             0.50%
</TABLE>

      All such commitment fees shall be calculated on the basis of a year of 365
(or, in a leap year, 366) days for the actual number of days elapsed. The
accrued commitment fees shall be due and payable in arrears upon any reduction
or termination of the Commitments and on the last Business Day of each Quarterly
Date and on the Drawdown Termination Date, commencing on the first such date
after the Closing Date.

            (b)   The Company agrees to pay (i) to the Administrative Agent for
the account of each Lender a participation fee with respect to its
participations in Letters of Credit, which shall accrue at the same Applicable
Margin used to determine the interest rate applicable to Fixed Rate Loans on the
average daily amount of such Lender's LC Exposure (excluding any portion thereof
attributable to unreimbursed disbursements) during the period from and including
the Closing Date to but excluding the later of the date on which such Lender's
Commitment terminates and the date on which such Lender ceases to have any LC
Exposure, and (ii) to the Issuing Bank a fronting fee, which shall accrue at the
rate of 0.125% per annum on the average daily amount of the LC Exposure
(excluding any portion thereof attributable to unreimbursed disbursements)
during the period from and including the Closing Date to but excluding the later
of the date of termination of the Commitments and the date on which there ceases
to be any LC Exposure, as well as the Issuing Bank's standard fees with respect
to the issuance, reissuance, amendment, renewal or extension of any Letter of
Credit or processing of drawings thereunder. The accrued participation fees and
fronting fees shall be due and payable on each Quarterly Date, commencing on the
first such date after the Closing Date; provided that all such fees shall be
payable on the date on which the Commitments terminate and any such fees
accruing after the date on which the Commitments terminate shall be payable on
demand. Any other fees payable to the Issuing Bank pursuant to this paragraph
shall be payable within 10 days after demand. All participation fees and
fronting fees shall be computed on the basis of a year of 360 days and shall be
payable for the actual number of days elapsed (including the first day but
excluding the last day).

            (c)   The Company agrees to pay to the Administrative Agent, for its
own account, fees payable in the amounts and at the times separately agreed upon
between the Company and the Administrative Agent.

            (d)   All fees payable hereunder shall be paid on the dates due, in
immediately available funds, to the Administrative Agent (or to the Issuing
Bank, in the case of fees payable to it) for distribution, in the case of
commitment fees and participation fees, to the Lenders. Fees paid shall not be
refundable under any circumstances.

                                      -20-

<PAGE>

      Section 2.05 Applicable 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.

      Section 2.06 Several Obligations. The failure of any Lender to make any
Loan to be made by it or to provide funds for disbursements under Letters of
Credit on the date specified therefor shall not relieve any other Lender of its
obligation to make its Loan or provide such 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 such funds to be provided by such other
Lender.

      Section 2.07 Notes.

            (a)   The Revolving Credit Loans made by each Lender shall be
evidenced by a single promissory note of the Company in substantially the form
of Exhibit B hereto, dated (i) the Closing Date or (ii) the effective date of an
Assignment and Assumption pursuant to Section 12.06(b), payable to the order of
such Lender in a principal amount equal to the maximum amount of its Commitment
as originally in effect and otherwise duly completed. The date, amount, type,
interest rate and maturity date 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 and, prior to any transfer of a Note held by it, endorsed by
such Lender on the schedule attached to such Note or any continuation thereof;
provided, however, such Lender shall have no liability to the Company if it
fails to record any such information and in no event shall such failure diminish
or impair the Company's obligation to repay all amounts owing to such Lender
under such Note.

            (b)   No Lender shall be entitled to have its Note subdivided, by
exchange for promissory notes of lesser denominations or otherwise, except in
connection with a permitted assignment of all or any portion of such Lender's
Commitment, Loans and Note pursuant to Subsection 12.06(b).

      Section 2.08 Prepayments.

            (a)   The Company may prepay Loans on any Business Day upon notice
to the Administrative Agent (which shall promptly notify the Lenders), which
notice shall be given by the Company not later than 12:00 noon Charlotte, North
Carolina time three (3) Business Days' prior to the date of such prepayment,
shall specify the amount of the prepayment (which shall be not less than
$1,000,000 (or increments of $1,000,000 in excess thereof) or the remaining
balance of any Loans outstanding, if less) 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
next Quarterly Date unless the prepayment is of the remaining balance of all
Loans outstanding. Any prepayment of any Fixed Rate Loans shall be subject to
the provisions of Section 5.05 hereof.

            (b)   If at any time the sum of the outstanding aggregate principal
amount of the Loans and the LC Exposure exceeds the lesser of the then effective
Borrowing Base or the aggregate amount of the Commitments, then the Company
shall within 30 days following such

                                      -21-

<PAGE>

event, either (i) pay or prepay the amount of such excess amount for application
first, toward reduction of all amounts previously drawn under Letters of Credit,
but not yet funded as a Revolving Credit Loan pursuant to Section 4.07(b) or
reimbursed, second, if necessary, toward reduction of the outstanding principal
balance of the Notes by prepaying Base Rate Loans, if any, then outstanding, and
third, if necessary, at the election of the Company, either toward a reduction
of the outstanding principal balance of the Notes by prepaying Fixed Rate Loans,
if any, then outstanding or by paying such amount to the Administrative Agent as
cash collateral for outstanding Letters of Credit, which amount shall be held by
the Administrative Agent as cash collateral to secure the Company's obligation
to reimburse the Issuing Bank and the Lenders for drawings under the Letters of
Credit or (ii) grant or cause to be granted to the Administrative Agent a first
priority Lien (subject only to Excepted Liens) in Oil and Gas Properties of the
Company or its Subsidiaries which has not been included in the determination of
the then effective Borrowing Base having a value equal to or greater than the
amount of such deficiency. All such Liens will be created and perfected by and
in accordance with the provisions of deeds of trust, security agreements and
financing statements or other Security Instruments, all in form and substance
reasonably satisfactory to the Administrative Agent and in sufficient executed
(and acknowledged where necessary or appropriate) counterparts for recording
purposes. The Company shall also pay any amounts payable pursuant to Section
5.05 in connection with any payment or prepayment made pursuant to this Section
2.08(b).

      Section 2.09 Borrowing Base.

            (a)   Initial Borrowing Base. For the period from and including the
Closing Date to but excluding the first Redetermination Date, the amount of the
Borrowing Base shall be $375,000,000.

            (b)   Scheduled and Interim Redeterminations. Subject to Section
2.09(d), the Borrowing Base shall be redetermined (a "Scheduled
Redetermination") on April 1st and October 1st of each year, commencing October
1, 2004. In addition (i) the Company may, by notifying the Administrative Agent
thereof, and the Administrative Agent may, at the direction of the Required
Lenders, by notifying the Company thereof, one time during any 12-month period,
elect to cause, and (ii) if any refinancing of the Debt of the Company under or
in respect of the Indenture or any Senior Subordinated Note permitted by the
terms of this Agreement results in the Company receiving net proceeds in excess
of the aggregate principal amount of the Senior Subordinated Notes outstanding
on the Closing Date, the Administrative Agent shall cause, the Borrowing Base to
be redetermined between Scheduled Redeterminations (a redetermination pursuant
to clause (i) or (ii) of this Section 2.09(b), called an "Interim
Redetermination") in accordance with this Section. The Borrowing Base shall be
subject to further adjustments from time to time pursuant to Section 9.15.

            (c)   Scheduled and Interim Redetermination Procedure.

                  (i)   Each Scheduled Redetermination and each Interim
Redetermination shall be effectuated as follows: Upon receipt by the
Administrative Agent of (A) the Reserve Report and the certificate required to
be delivered by the Company to the Administrative Agent pursuant to Section
8.04, and (B) such other reports, data and supplemental information, including,
without limitation, the information provided pursuant to

                                      -22-

<PAGE>

Section 8.04(e), as may, from time to time, be reasonably requested by the
Required Lenders (the Reserve Report, such certificate and such other reports,
data and supplemental information being the "Engineering Reports"), the
Administrative Agent shall evaluate the information contained in the Engineering
Reports and shall, in good faith, propose a new Borrowing Base (the "Proposed
Borrowing Base") based upon such information and such other information
(including, without limitation, the status of title information with respect to
the Oil and Gas Properties as described in the Engineering Reports and the
existence of any other Debt) as the Administrative Agent deems appropriate and
consistent with its normal oil and gas lending criteria as it exists at the
particular time. In no event shall the Proposed Borrowing Base exceed the
aggregate Commitments.

                  (ii)  The Administrative Agent shall notify the Company and
the Lenders of the Proposed Borrowing Base (the "Proposed Borrowing Base
Notice"):

                        (A)   in the case of a Scheduled Redetermination (1) if
the Administrative Agent shall have received the Engineering Reports required to
be delivered by the Company pursuant to Section 2.09(c)(i) in a timely and
complete manner, on or before March 1 and September 1 of each year, commencing
September 1, 2004, or (2) if the Administrative Agent shall not have received
the Engineering Reports required to be delivered by the Company pursuant to
Section 2.09(c)(i) in a timely and complete manner, then promptly after the
Administrative Agent has received complete Engineering Reports from the Company
and has had a reasonable opportunity to determine the Proposed Borrowing Base in
accordance with Section 2.09(c)(i); and

                        (B)   in the case of an Interim Redetermination,
promptly, and in any event, within fifteen (15) days after the Administrative
Agent has received the required Engineering Reports.

                  (iii) Any Proposed Borrowing Base that would increase the
Borrowing Base then in effect must be approved or deemed to have been approved
by all of the Lenders as provided in this Section 2.09(c)(iii); and any Proposed
Borrowing Base that would decrease or maintain the Borrowing Base then in effect
must be approved or be deemed to have been approved by the Required Lenders as
provided in this Section 2.09(c)(iii). Upon receipt of the Proposed Borrowing
Base Notice, each Lender shall have fifteen (15) days to agree with the Proposed
Borrowing Base or disagree with the Proposed Borrowing Base by proposing an
alternate Borrowing Base. If at the end of such fifteen (15) days, any Lender
has not communicated its approval or disapproval in writing to the
Administrative Agent, such silence shall be deemed to be an approval. If, at the
end of such 15-day period, all of the Lenders, in the case of a Proposed
Borrowing Base that would increase the Borrowing Base then in effect, or the
Required Lenders, in the case of a Proposed Borrowing Base that would decrease
or maintain the Borrowing Base then in effect, have approved or deemed to have
approved, as aforesaid, then the Proposed Borrowing Base shall become the new
Borrowing Base, effective on the date specified in Section 2.09(d). If, however,
at the end of such 15-day period, all of the Lenders or the Required Lenders, as
applicable, have not approved or deemed to have approved, as aforesaid, then the
Administrative Agent shall poll the Lenders to ascertain the highest Borrowing
Base then acceptable to the Lenders for purposes of this Section 2.09 and, such
amount shall become the new Borrowing Base, effective on the date specified in
Section 2.09(d).

                                      -23-

<PAGE>

                  (iv)  If any Lender refuses to approve a Proposed Borrowing
Base pursuant to Section 2.09(c)(iii), the Company shall have the right, without
the consent of the Lenders but with the prior written consent of the
Administrative Agent, which consent shall not be unreasonably withheld, to cause
the Commitment of such dissenting Lender to be replaced pursuant to Section
5.07(b).

            (d)   Effectiveness of a Redetermined Borrowing Base. After a
redetermined Borrowing Base is approved or is deemed to have been approved by
all of the Lenders or the Required Lenders, as applicable, pursuant to Section
2.09(c)(iii), and any dissenting Lenders are replaced pursuant to Section
2.09(c)(iv) and such replacement Lenders have approved or are deemed to have
approved the redetermined Borrowing Base pursuant to Section 2.09(c)(iii), as
applicable, the Administrative Agent shall notify the Company and the Lenders of
the amount of the redetermined Borrowing Base (the "New Borrowing Base Notice"),
and such amount shall become the new Borrowing Base, effective and applicable to
the Company, the Administrative Agents, the Issuing Bank and the Lenders:

                  (i)   in the case of a Scheduled Redetermination, (1) if the
Administrative Agent shall have received the Engineering Reports required to be
delivered by the Company pursuant to Section 2.09(c)(i) in a timely and complete
manner, on the next succeeding March 1st or September 1st, as applicable, or (2)
if the Administrative Agent shall not have received the Engineering Reports
required to be delivered by the Company pursuant to Section 2.09(c)(i) in a
timely and complete manner, then on the next succeeding Business Day; and

                  (ii)  in the case of an Interim Redetermination, on the date
that is sixteen (16) days after the Lenders have received the Proposed Borrowing
Base Notice.

Such amount shall then become the Borrowing Base until the next Scheduled
Redetermination Date, the next Interim Redetermination Date or the next
adjustment to the Borrowing Base under Section 9.15, whichever occurs first.
Notwithstanding the foregoing, no Scheduled Redetermination or Interim
Redetermination shall become effective until the New Borrowing Base Notice
related thereto is received by the Company.

                                  ARTICLE III

                       Payments of Principal and Interest

      Section 3.01 Repayment of Loans. The Company hereby unconditionally
promises to pay to the Administrative Agent for the account of each Lender the
then unpaid principal amount of each Loan on or before the Drawdown Termination
Date.

                                      -24-

<PAGE>

      Section 3.02 Interest.

            (a)   The Company 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 of such Loan to but
excluding the date such Loan shall be paid in full, at the following rates per
annum:

                  (i)   if such Loan is a Base Rate Loan, 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; and

                  (ii)  if such Loan is a Fixed Rate Loan, for each Interest
Period relating thereto (excluding the last day thereof), the Fixed Rate for
such Loan plus the Applicable Margin, but in no event to exceed the Highest
Lawful Rate.

      Notwithstanding the foregoing, the Company 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 Company hereunder, under
any Note or under any other Security Instrument, which shall not be paid in full
when due (whether at stated maturity, by acceleration or otherwise), for the
period commencing on the due date thereof until the same is paid in full, but in
no event to exceed the Highest Lawful Rate.

            (b)   Accrued interest on each Base Rate Loan shall be payable
quarterly on each Quarterly Date and accrued interest on each Fixed Rate Loan
shall be payable on the last day of the Interest Period therefor and, if an
Interest Period is longer than three months or 90 days, 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 Fixed Rate 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).

            (c)   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 Company thereof.

                                   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 Company
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 Company
from time to time, not later than 11:00 a.m. Charlotte, North Carolina 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). The Company shall, at the time of making each payment under this
Agreement, any Note or any Letter of Credit Agreement, specify to the
Administrative Agent the Loans or other amounts

                                      -25-

<PAGE>

payable by the Company hereunder to which such payment is to be applied (and in
the event that it fails to so specify, or if an Event of Default has occurred
and is continuing, the Administrative Agent may distribute such payment to the
Lenders in such manner as it or the Required Lenders determine to be
appropriate, subject to Section 4.02). 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, for
account of such Lender's Applicable Lending Office for the Loan in respect of
which such payment is made. If the due date of any payment under this Agreement,
any Note or any Letter of Credit Agreement, would otherwise fall on a day which
is not a Business Day, such due 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.

      Section 4.02 Pro Rata Treatment. Except to the extent otherwise provided
herein: (a) each borrowing from the Lenders under Section 2.01 shall be made
from the Lenders, each payment of commitment fee or other fees under Section
2.04 shall be made for account of the Lenders unless otherwise provided in
Section 2.04, and each termination or reduction of the amount of the Commitments
under Section 2.03 shall be applied to the Commitments of the Lenders, pro rata
according to the amounts of their respective unused Commitments, (b) each
payment of principal of Loans by the Company 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 (c) each payment of interest on Loans by the
Company shall be made for account of the Lenders pro rata in accordance with the
amounts of interest due and payable to the respective Lenders.

      Section 4.03 Computations. Interest on Fixed Rate Loans 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 payable,
unless such calculation would result in a usurious 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) 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
payable with respect to the Prime Rate, and (b) a year of 360 days and actual
days elapsed (including the first day but excluding the last day) occurring in
the period for which payable in the case of the Federal Funds Rate, unless such
calculation would result in a usurious rate, in which case interest shall be
calculated on a per annum basis of a year of 365 or 366 days, as the case may
be.

      Section 4.04 Non-receipt of Funds by the Administrative Agent. Unless the
Administrative Agent shall have been notified by a Lender or the Company prior
to the date on which such notifying party is scheduled to make payment to the
Administrative Agent of (in the case of a Lender) the proceeds of a Loan to be
made by it hereunder or (in the case of the Company) 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 Company (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

                                      -26-

<PAGE>

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 the date the Administrative Agent recovers such
amount at a rate per annum equal to (i) the Federal Funds Rate (but not to
exceed the Highest Lawful Rate), for Required Payments required to be made by
any Lender, or (ii) the Post-Default Rate (but not to exceed the Highest Lawful
Rate), for Required Payments required to be made by the Company.

      Section 4.05 Sharing of Payments, Etc. The Company agrees that, in
addition to (and without limitation of) any right of set-off, Lenders' lien or
counterclaim a Lender may otherwise have, each Lender shall be entitled (upon
consent of the Administrative Agent), at its option, to offset balances held by
it for account of the Company 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 or under any Letter of Credit
Agreement, which is not paid when due (regardless of whether such balances are
then due to the Company), in which case such Lender shall promptly notify the
Company and the Administrative Agent thereof, provided that such Lender's
failure to give such notice shall not affect the validity thereof. If any Lender
shall obtain payment of any principal of or interest on any Loan made by it to
the Company under this Agreement or payment of any reimbursement obligation
under a Letter of Credit Agreement through the exercise of any right of set-off,
Lenders' 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 then due hereunder or under the respective Letter of
Credit Agreement, as the case may be, by the Company to such Lender than the
percentage received by any other Lenders, such Lender shall promptly rebate such
excess amount to the Administrative Agent for distribution in accordance with
the terms of Section 4.02 hereof, and the Lenders shall 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 pro rata in accordance with the unpaid
reimbursement obligation owed to each of the Lenders. To such end, all the
Lenders shall make appropriate adjustments among themselves if such payment is
rescinded or must otherwise be restored. Nothing contained herein shall require
any Lender to exercise any such right or shall affect the right of any Lender to
exercise any such right with respect to any other indebtedness or obligation of
the Company to such Lender; provided, however, with respect to the Indebtedness
or any other indebtedness owed by the Company or any Subsidiary to any Lender or
any Affiliate of a Lender, all the Lenders shall share the benefit of any
set-off pertaining to the Indebtedness or such other indebtedness pro rata in
accordance with the unpaid principal and/or interest on the Loans held by each
of the Lenders and the aforementioned other indebtedness or pro rata in
accordance with the unpaid reimbursement owed to each of the Lenders and the
aforementioned other indebtedness. 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.

      Section 4.06 Assumption of Risks. The Company assumes all risks of the
acts or omissions of beneficiaries of any of the Letters of Credit with respect
to its use of the Letters of Credit. Except in the case of gross negligence or
willful misconduct on the part of the Issuing

                                      -27-

<PAGE>

Bank or any of its employees, neither the Issuing Bank, the Issuing Bank's
correspondent banks, the Administrative Agent nor any Lender shall be
responsible: (i) for the validity or genuineness of certificates or other
documents, even if such certificates or other documents should in fact prove to
be invalid, fraudulent or forged; (ii) 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; (iii) for errors in translation or
for errors in interpretation of technical terms; or (iv) for any other
consequences arising from causes beyond the Issuing Bank's control. 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
correspondent banks; and none of the above shall affect, impair or prevent the
vesting of any of the Issuing Bank's rights or 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, subject to the provisions of Section
2.01(b)(iii). The Issuing Bank and the Issuing Bank's correspondent banks may
accept certificates or other documents that appear on their face to be in order,
without responsibility for further investigation. In furtherance and not in
limitation of the foregoing provisions, the Company agrees that any action,
inaction or omission taken or not taken by the Issuing Bank or any of the
Issuing Bank's correspondent banks in absence of gross negligence or willful
misconduct by the Issuing Bank or any of the Issuing Bank's correspondent banks
in connection with any Letter of Credit, or any related drafts, certificates,
documents or instruments, shall be binding on the Company and shall not put the
Issuing Bank or the Issuing Bank's correspondent banks or the Administrative
Agent or any Lender under any resulting liability to the Company. The Issuing
Bank agrees to use reasonable judgment in its selection of correspondent banks.

      Section 4.07 Obligation to Reimburse and to Repay.

            (a)   If any draft or claim shall be presented for payment under a
Letter of Credit, after confirming that such draft or claim complies with all
requirements of the relevant Letter of Credit, the Issuing Bank shall promptly
notify the Company of the date and the amount of the draft or claim presented
for payment and shall promptly notify the Administrative Agent and each Lender
thereof and of the Business Day on which such draft or claim is to be honored
and the ratable share of such draft or claim attributable to such Lender on the
basis of its Commitment.

            (b)   If a disbursement by the Issuing Bank is made under any Letter
of Credit and no Event of Default under this Agreement shall have occurred and
be continuing, the Company may elect to have the amount of such disbursement up
to the amount of the Commitments then available treated as a Revolving Credit
Loan to the Company as provided in Section 2.01(a) hereof, subject to the terms
and conditions set forth in this Agreement. To evidence such election, the
Company shall (promptly after receipt of notice that a Letter of Credit has been
drawn upon) give written notice of same to the Administrative Agent
contemporaneously with delivery of the notice of borrowing (in the form attached
as Exhibit E hereto). With respect to any disbursement under a Letter of Credit
for which no such election is made or after and during the continuance of an
Event of Default, the Company shall pay to the Issuing Bank promptly after
notice of any such disbursement is received by the Company in federal or other
immediately available funds, 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 hereunder or under other provisions of the Letter of Credit
Agreement), together with

                                      -28-

<PAGE>

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 (x) the Base Rate (as in effect from time to time) plus the Applicable Margin
for Base Rate Loans (but in no event to exceed the Highest Lawful Rate) for the
first Business Day following the date of such disbursement and (y) 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 second Business Day following
the date of such disbursement to and including the date of repayment in full of
such disbursed amount.

            (c)   The Company's obligation to make each such payment shall be
absolute and unconditional and shall not be subject to any defense or be
affected by any right of setoff, counterclaim or recoupment which the Company
may now or hereafter have against any beneficiary of any Letter of Credit, the
Issuing Bank, the Administrative Agent, any Lender, or any other Person for any
reason whatsoever (but, without prejudice to any other provisions hereof, any
such payment shall not waive, impair or otherwise adversely affect any claim, if
any, that the Company may have against any beneficiary of a Letter of Credit,
the Issuing Bank, the Administrative Agent, any Lender or any other Person).

            (d)   In the event of the occurrence of any Event of Default, upon
request of the Required Lenders made during the continuation of such occurrence,
an amount equal to the entire remaining obligation of the Issuing Bank under
each outstanding Letter of Credit shall be deemed to be forthwith due and owing
by the Company to the Issuing Bank as of the date of any such occurrence to be
held by the Administrative Agent as cash collateral, and the Company'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.
In addition, the Company's obligation shall not be subject to any defense or be
affected by a right of setoff, counterclaim or recoupment which the Company may
now or hereafter have against any such beneficiary, the Issuing Bank, the
Administrative Agent, any Lender, or any other Person for any reason whatsoever
(but, without prejudice to any other provisions hereof, any such payment shall
not waive, impair or otherwise adversely affect any claim, if any, that the
Company may have against any beneficiary of a Letter of Credit, the Issuing
Bank, the Administrative Agent, any Lender or any other Person). The Company
hereby grants a security interest in any such amounts held as cash collateral to
the Administrative Agent for the benefit of the Lenders as security for all
Indebtedness now or hereafter owing hereunder. In the event of any such deposit
(or prepayment of Letters of Credit pursuant to Section 2.08) by the Company 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 then due and payable under this
Agreement, any Note or the Security Instruments, to remit to the Company amounts
of such cash collateral, deposits or prepayments for which the contingent
obligations evidenced by such Letters of Credit have ceased.

      Section 4.08 Obligations for Letters of Credit.

            (a)   Immediately upon issuance of any Letter of Credit by the
Issuing Bank, each Lender shall be deemed to be a participant through the
Issuing Bank in the obligation of the Issuing Bank under such Letter of Credit.
Upon the delivery by such Lender to the Issuing Bank

                                      -29-

<PAGE>

of funds requested for a disbursement pursuant to Section 4.08(c) hereof, such
Lender shall be deemed as having purchased a participating interest in the
Company's reimbursement obligations with respect to such Letter of Credit in an
amount equal to such funds delivered to the Issuing Bank.

            (b)   Each Lender severally agrees with the Issuing Bank and the
Company that it shall be unconditionally liable, without regard to the
occurrence of any Event of Default, for its pro-rata share based upon the ratio
of its Commitment to the total Commitments of all Lenders, to reimburse on
demand, the Issuing Bank for the amount of each disbursement under a Letter of
Credit; provided, however, notwithstanding anything to the contrary contained in
this Section 4.08(b), if due to the gross negligence or willful misconduct of
the Issuing Bank a Letter of Credit is improperly issued or improperly honored,
the Lenders shall not be liable to reimburse the Issuing Bank for their pro rata
share of any disbursement under such Letter of Credit.

            (c)   The Issuing Bank shall promptly request from each Lender its
ratable share of any disbursement under any Letter of Credit that the Company
has not elected hereunder to treat as a Revolving Credit Loan pursuant to
Section 4.07, which amount shall be made available by each Lender to the Issuing
Bank at the Principal Office in immediately available funds no later than 2:00
p.m. Charlotte, North Carolina time on the date requested. If such amount due to
the Issuing Bank is made available later than 2:00 p.m. Charlotte, North
Carolina time on the date requested, then such Lender shall pay to the Issuing
Bank such amount with interest thereon in respect of each day during the period
commencing on the date such amount was requested until the date the Issuing Bank
receives such amount at a rate per annum equal to the Federal Funds Rate (but
not to exceed the Highest Lawful Rate).

                                   ARTICLE V

                    Yield Protection; Illegality; Taxes; Etc.

      Section 5.01 Additional Costs.

            (a)   The Company shall pay directly to each Lender from time to
time on demand such amounts as such Lender may reasonably determine to be
necessary to compensate it for any costs which such Lender determines are
attributable to its making or maintaining any Loans under this Agreement or its
Note or the participation in Letters of Credit, or its obligation to make any
such Loans or participate in Letters of Credit hereunder, or any reduction in
any amount receivable by such Lender hereunder in respect of any such Loans or
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 its Note in respect of any Loans
or Letters of Credit (other than taxes imposed on the overall net income of such
Lender or of its Applicable Lending Office); or (ii) imposes or modifies any
reserve, special deposit, deposit insurance or assessment, 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
(including any Loans or any deposits referred to in the definition of "Fixed
Base Rate" in Section 1.02); or (iii) imposes any other condition affecting this
Agreement or its Note (or any of such extensions of credit or liabilities). Each
Lender will notify the Company of any

                                      -30-

<PAGE>

event occurring after the date of this Agreement which will entitle such Lender
to compensation pursuant to this Section 5.01(a) as promptly as practicable
after it obtains knowledge thereof, if it determines to request such
compensation, and will set forth in reasonable detail the basis for and manner
of determining such compensation; provided, however, that the Company shall not
be required to compensate a Lender pursuant to this Section 5.01(a) for any
Additional Costs incurred more than 180 days prior to the date that such Lender
notifies the Company of the Regulatory Change giving rise to such Additional
Costs and of such Lender's intention to claim compensation therefor; provided
further, however, that if the Regulatory Change giving rise to such Additional
Costs is retroactive, then the 180-day period shall be extended to include the
period of retroactive effect thereof. If any Lender requests compensation from
the Company under this Section 5.01(a), or under Section 5.01(c), the Company
may, by notice to such Lender (with a copy to the Administrative Agent), suspend
the obligation of such Lender to make Loans of the type with respect to which
such compensation is requested.

            (b)   Without limiting the effect of the foregoing provisions of
this Section 5.01, in the event that, by reason of any Regulatory Change, any
Lender either (i) incurs Additional Costs based on or measured by the excess
above a specified level of the amount of a category of deposits or other
liabilities of such Lender which includes deposits by reference to which the
interest rate on Fixed Rate Loans is determined as provided in this Agreement or
a category of extensions of credit or other assets of such Lender which includes
Fixed Rate Loans or (ii) becomes subject to restrictions on the amount of such a
category of liabilities or assets which it may hold, then, if such Lender so
elects by notice to the Company (with a copy to the Administrative Agent), the
obligation of such Lender to make Loans of such type hereunder shall be
suspended until the earlier to occur of (y) the date such Lender is no longer
within the restrictions of such Regulatory Change or (z) the date such
Regulatory Change ceases to be in effect (in which case the provisions of
Section 5.04 shall be applicable).

            (c)   Without limiting the effect of the foregoing provisions of
this Section 5.01 (but without duplication), the Company shall pay directly to
each Lender from time to time on request such amounts as such Lender may
reasonably determine to be necessary to compensate such Lender for any increased
costs which it determines are attributable to the maintenance by it or any of
its Affiliates pursuant to any law or regulation of any jurisdiction or any
interpretation, directive or request (whether or not having the force of law and
whether in effect on the date of this Agreement or thereafter) of any court or
governmental or monetary authority of capital in respect of its Loans or Letters
of Credit hereunder or its obligation to make Loans or participate in Letters of
Credit hereunder (such compensation to include, without limitation, an amount
equal to any reduction in return on assets or equity of such Lender to a level
below that which it could have achieved but for such law, regulation,
interpretation, directive or request). Each Lender will notify the Company if it
is entitled to compensation pursuant to this Section 5.01(c) as promptly as
practicable after it obtains knowledge of the facts that entitled it to such
compensation, if it determines to request such compensation, and will set forth
in reasonable detail the basis for and manner of determining such compensation.

            (d)   Determinations and allocations by a Lender for purposes of
this Section 5.01 of the effect of any Regulatory Change pursuant to subsections
(a) or (b), or of the effect of capital maintained pursuant to subsection (c),
on its costs of making or maintaining Loans or its obligation to make Loans or
participate in Letters of Credit, or on amounts receivable by, or the

                                      -31-

<PAGE>

rate of return to, it in respect of Loans, Letters of Credit or such obligation,
and of the additional amounts required to compensate such Lender under this
Section 5.01, shall be conclusive absent manifest error, provided that such
determinations and allocations are made on a reasonable basis.

      Section 5.02 Limitation on Types of Loans. Anything herein to the contrary
notwithstanding, if:

            (a)   the Administrative Agent reasonably determines that quotations
of interest rates for the relevant deposits referred to in the definition of
"Fixed Base Rate" in Section 1.02 are not being provided in the relevant amounts
or for the relevant maturities for purposes of determining the rate of interest
for Fixed Rate Loans as provided in this Agreement; or

            (b)   the Required Lenders determine (which determination shall be
conclusive) and notify the Administrative Agent that the relevant rates of
interest referred to in the definition of "Fixed Rate" in Section 1.02 upon the
basis of which the rate of interest for Fixed Rate Loans is to be determined do
not adequately cover the cost to the Lenders of making or maintaining such
Loans;

then the Administrative Agent shall give the Company and each Lender prompt
notice thereof, and so long as such condition remains in effect, the Lenders
shall be under no obligation to make Fixed Rate Loans of such type; provided,
however, such Loans shall be made as Base Rate Loans. Notwithstanding the
foregoing, the Lenders shall maintain until the end of the Interest Period then
in effect such Fixed Rate Loans then outstanding.

      Section 5.03 Illegality. Notwithstanding any other provision in this
Agreement, in the event that it becomes unlawful, as the result of circumstances
not reasonably within the control of any Lender, for such Lender or its
Applicable Lending Office to honor its obligation to make or maintain Fixed Rate
Loans hereunder, then such Lender shall promptly notify the Company thereof
(with a copy to the Administrative Agent) and such Lender's obligation to make
or maintain Fixed Rate Loans hereunder shall be suspended until such time as
such Lender may again make and maintain such affected Loans (in which case the
provisions of Section 5.04 shall be applicable).

      Section 5.04 Certain Base Rate Loans pursuant to Sections 5.01 and 5.03.
If the obligations of any Lender to make Fixed Rate Loans ("Affected Loans")
shall be suspended pursuant to Section 5.01 or 5.03, 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 5.03 has occurred and such
Lender so requests by notice to the Company (with a copy to the Administrative
Agent), 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 Certain Compensation. The Company shall pay to the
Administrative Agent for the account of each Lender, upon the request of such
Lender through the Administrative Agent, such amount or amounts as shall be
sufficient (in the reasonable opinion

                                      -32-

<PAGE>

of such Lender) to compensate it for any loss, cost or expense which such Lender
reasonably determines is attributable to:

            (a)   any payment of a Fixed Rate Loan made by the Company on a date
other than the last day of an Interest Period for such Loan (whether by reason
of acceleration or otherwise); or

            (b)   the conversion of any Fixed Rate Loan other than on the last
day of the Interest Period applicable thereto; or

            (c)   the failure to borrow, convert, continue or prepay any Fixed
Rate Loan on the date specified in any notice delivered under Section 2.02.

      Without limiting the foregoing, such compensation shall include an amount
equal to the excess, if any, of: (i) the amount of interest which otherwise
would have accrued on the principal amount so paid or not borrowed, converted,
continued or prepaid for the period from and including the date of such payment
or failure to borrow, convert, continue or prepay to but excluding the last day
of the Interest Period for such Loan (or, in the case of a failure to borrow,
convert, continue or prepay to but excluding the last day of the Interest Period
for such Loan which would have commenced on the date specified therefor in the
relevant notice) at the applicable rate of interest for such Loan provided for
herein; over (ii) the amount of interest (as reasonably determined by such
Lender) such Lender would have bid in the London interbank market for Dollar
deposits for amounts comparable to such principal amount and maturities
comparable to such period. A determination of any Lender as to the amounts
payable pursuant to this Section 5.05 shall be prima facie evidence of the
correctness of such determination.

      Section 5.06 Taxes.

            (a)   Payments Free of Taxes. Any and all payments by or on account
of any obligation of the Company hereunder shall be made free and clear of and
without deduction for any Indemnified Taxes or Other Taxes; provided that if the
Company shall be required to deduct any Indemnified Taxes or Other Taxes from
such payments, then (i) the sum payable shall be increased as necessary so that
after making all required deductions (including deductions applicable to
additional sums payable under this Section) the Administrative Agent, Lender or
Issuing Bank (as the case may be) receives an amount equal to the sum it would
have received had no such deductions been made, (ii) the Company shall make such
deductions and (iii) the Company shall pay the full amount deducted to the
relevant Governmental Authority in accordance with applicable law.

            (b)   Payment of Other Taxes by the Company. In addition, the
Company shall pay any Other Taxes to the relevant Governmental Authority in
accordance with applicable law.

            (c)   Indemnification by the Company. The Company shall indemnify
the Administrative Agent, each Lender and the Issuing Bank, within 10 days after
written demand therefor, for the full amount of any Indemnified Taxes or Other
Taxes paid by the Administrative Agent, such Lender or the Issuing Bank, as the
case may be, on or with respect to any payment by or on account of any
obligation of the Company hereunder (including Indemnified Taxes or Other Taxes
imposed or asserted on or attributable to amounts payable under this Section)
and

                                      -33-

<PAGE>

any penalties, interest and reasonable expenses arising therefrom or with
respect thereto, whether or not such Indemnified Taxes or Other Taxes were
correctly or legally imposed or asserted by the relevant Governmental Authority.
A certificate as to the amount of such payment or liability delivered to the
Company by a Lender or the Issuing Bank, or by the Administrative Agent on its
own behalf or on behalf of a Lender or the Issuing Bank, shall be conclusive
absent manifest error.

            (d)   Evidence of Payments. As soon as practicable after any payment
of Indemnified Taxes or Other Taxes by the Company to a Governmental Authority,
the Company shall deliver to the Administrative Agent the original or a
certified copy of a receipt issued by such Governmental Authority evidencing
such payment, a copy of the return reporting such payment or other evidence of
such payment reasonably satisfactory to the Administrative Agent.

            (e)   Foreign Lenders. Any Foreign Lender that is entitled to an
exemption from or reduction of withholding tax under the law of the jurisdiction
in which the Company is located, or any treaty to which such jurisdiction is a
party, with respect to payments under this Agreement shall deliver to the
Company (with a copy to the Administrative Agent), at the time or times
prescribed by applicable law, such properly completed and executed documentation
prescribed by applicable law or reasonably requested by the Company as will
permit such payments to be made without withholding or at a reduced rate.

            (f)   Tax Refunds. If the Administrative Agent or a Lender
determines, in its sole discretion, that it has received a refund of any Taxes
or Other Taxes as to which it has been indemnified by the Company or with
respect to which the Company has paid additional amounts pursuant to this
Section 5.06, it shall pay over such refund to the Company (but only to the
extent of indemnity payments made, or additional amounts paid, by the Company
under this Section 5.06 with respect to the Taxes or Other Taxes giving rise to
such refund), net of all out-of-pocket expenses of the Administrative Agent or
such Lender and without interest (other than any interest paid by the relevant
Governmental Authority with respect to such refund); provided, that the Company,
upon the request of the Administrative Agent or such Lender, agrees to repay the
amount paid over to the Company (plus any penalties, interest or other charges
imposed by the relevant Governmental Authority) to the Administrative Agent or
such Lender in the event the Administrative Agent or such Lender is required to
repay such refund to such Governmental Authority. This Section 5.06 shall not be
construed to require the Administrative Agent or any Lender to make available
its tax returns (or any other information relating to its taxes which it deems
confidential) to the Company or any other Person.

      Section 5.07 Mitigation Obligations; Replacement of Lenders.

            (a)   Designation of Different Lending Office. If any Lender
requests compensation under Section 5.01, or if the Company is required to pay
any additional amount to any Lender or any Governmental Authority for the
account of any Lender pursuant to Section 5.06, then such Lender shall use
reasonable efforts to designate a different lending office for funding or
booking its Loans hereunder or to assign its rights and obligations hereunder to
another of its offices, branches or affiliates, if, in the judgment of such
Lender, such designation or assignment (i) would eliminate or reduce amounts
payable pursuant to Section 5.01 or Section 5.06, as the case may be, in the
future and (ii) would not subject such Lender to any

                                      -34-

<PAGE>

unreimbursed cost or expense and would not otherwise be disadvantageous to such
Lender. The Company hereby agrees to pay all reasonable costs and expenses
incurred by any Lender in connection with any such designation or assignment.

            (b)   Replacement of Lenders. If any Lender requests compensation
under Section 5.01, or if the Company is required to pay any additional amount
to any Lender or any Governmental Authority for the account of any Lender
pursuant to Section 5.06, or if any Lender defaults in its obligation to fund
Loans hereunder, or if any Lender refuses to approve a Proposed Borrowing Base
pursuant to Section 2.09(c)(iii) and as a result, the Company elects to replace
such dissenting Lender pursuant to Section 2.09(c)(iv), then the Company may, at
its sole expense and effort, upon notice to such Lender and the Administrative
Agent, require such Lender to assign and delegate, without recourse (in
accordance with and subject to the restrictions contained in Section 12.06(a)),
all its interests, rights and obligations under this Agreement to an assignee
that shall assume such obligations (which assignee may be another Lender, if a
Lender accepts such assignment); provided that (i) the Company shall have
received the prior written consent of the Administrative Agent, which consent
shall not unreasonably be withheld, (ii) such Lender shall have received payment
of an amount equal to the outstanding principal of its Loans and LC Exposure,
accrued interest thereon, accrued fees and all other amounts payable to it
hereunder, from the assignee (to the extent of such outstanding principal and
accrued interest and fees) or the Company (in the case of all other amounts) and
(iii) in the case of any such assignment resulting from a claim for compensation
under Section 5.01 or payments required to be made pursuant to Section 5.06,
such assignment will result in a reduction in such compensation or payments. A
Lender shall not be required to make any such assignment and delegation if,
prior thereto, as a result of a waiver by such Lender or otherwise, the
circumstances entitling the Company to require such assignment and delegation
cease to apply.

                                   ARTICLE VI

                              Conditions Precedent

      Section 6.01 Initial Loans and Letters of Credit.

      The obligation of the Lenders to make the initial Loans and to issue,
renew, extend or reissue Letters of Credit hereunder is subject to the receipt
by the Administrative Agent of all fees payable pursuant to Section 2.04 or
otherwise under this Agreement and the following documents and satisfaction of
the other conditions provided in this Article VI, each of which shall be
satisfactory to the Administrative Agent in form and substance:

            (a)   Certificates of the Secretary, Assistant Secretary or any Vice
President of the Company setting forth (i) resolutions of its board of directors
in form and substance satisfactory to the Administrative Agent with respect to
the authorization of the Notes, Letters of Credit and Letter of Credit
Agreements, this Agreement and the other Security Instruments provided herein,
(ii) the officers of the Company (y) who are authorized to sign this Agreement,
the Notes, Letter of Credit Agreement and the other Security Instruments and
request Letters of Credit hereunder, 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

                                      -35-

<PAGE>

notices and other communications in connection with this Agreement and the
transactions contemplated hereby, and (iii) specimen signatures of the officers
so authorized. The Administrative Agent and the Lenders may conclusively rely on
such certificate until the Administrative Agent receives notice in writing from
the Company to the contrary.

            (b)   A copy, certified as true by the Secretary, Assistant
Secretary or any Vice President of the Company of the articles or certificate of
incorporation and the bylaws of the Company.

            (c)   Certificates of the appropriate state agencies with respect to
the valid existence and good standing of the Company and the qualification of
each to do business as a foreign corporation in any jurisdiction in which the
ownership of Property or the nature of activities requires such qualification
except where the failure to so qualify would not have a Material Adverse Effect.

            (d)   A compliance certificate which shall be true and correct in
the form of Exhibit C, duly and properly executed by an executive officer of the
Company, and dated as of the date of the funding of the first Loan provided for
in Section 2.01 of this Agreement.

            (e)   This Agreement, duly completed and executed by the Company and
the Lenders.

            (f)   The Notes, duly completed and executed by the Company.

            (g)   A favorable opinion of King & Spalding LLP, counsel to the
Company, substantially in the form of Exhibit D hereto.

            (h)   Engineering Reports evaluating the value of the Company's and
each Subsidiary's producing and non-producing Oil and Gas Properties as of
December 31, 2003.

            (i)   Such other documents as the Administrative Agent or any Lender
or special counsel to the Administrative Agent may reasonably request.

            (j)   The Administrative Agent and the Lenders shall be satisfied
with all environmental issues (if any) relating to the Company's Properties.

            (k)   The Administrative Agent and the Lenders shall be satisfied
with the Company's title to its Properties.

            (l)   All Debt under the Existing Credit Agreement shall have been
paid in full and the Existing Credit Agreement and the commitments of the
lenders party thereto shall have been cancelled in writing by the parties
thereto, a copy of such written cancellation shall have been provided to the
Administrative Agent.

      Section 6.02 Initial and Subsequent Loans and Letters of Credit. The
obligation of the Lenders to make, convert or continue Loans (other than Base
Rate Loans which are made pursuant to the terms hereof solely to convert
existing Loans in the normal course on the last day of an Interest Period
therefor) to the Company upon the occasion of each borrowing hereunder

                                      -36-

<PAGE>

(including the initial borrowing) or of the Administrative Agent to issue,
renew, extend or reissue Letters of Credit is subject to the further conditions
precedent that, as of the date of such Loans, conversions or continuations or
issuance, renewal, extension or reissuance of such Letter of Credit and after
giving effect thereto: (i) no Event of Default shall have occurred and be
continuing; (ii) no condition causing a Material Adverse Effect shall have
occurred and be continuing; and (iii) the representations and warranties made by
the Company in Article VII shall be true in material respects on and as of the
date of the making, conversion or continuation of such Loans or the issuance,
renewal, extension or reissuance of such Letters of Credit with the same force
and effect as if made on and as of such date and following such new borrowing,
conversion or continuation or issuance, renewal, extension or reissuance except
as such representations and warranties specifically relate to an earlier date or
are modified to give effect to transactions expressly permitted hereby. Each
request for a borrowing, conversion or continuation and selection of an Interest
Period (other than Base Rate Loans which are made pursuant to the terms hereof
solely to convert existing Loans in the normal course on the last day of an
Interest Period therefor) or request for the issuance, renewal, extension or
reissuance of a Letter of Credit by the Company hereunder shall constitute a
certification by the Company to the effect set forth in the preceding sentence
(both as of the date of such notice and, unless the Company otherwise notifies
the Administrative Agent prior to the date of and immediately following such
borrowing, conversion or continuation, or issuance, renewal, extension or
reissuance as of the date thereof).

      Section 6.03 Conditions Relating to Letters of Credit. In addition to the
satisfaction of all other conditions precedent set forth in this Article VI, the
issuance, renewal, extension or reissuance of the Letters of Credit referred to
in Section 2.01(b) is subject to the following additional conditions precedent:

            (a)   At least two (2) Business Days prior to the date of the
issuance, renewal, extension or reissuance of each Letter of Credit, the
Administrative Agent shall have received a written request for a Letter of
Credit as described in Section 2.02.

            (b)   The Company shall have duly and validly executed and delivered
to the Issuing Bank a Letter of Credit Agreement pertaining to the Letter of
Credit.

      Section 6.04 Subsequent Environmental Audits--New Acquisitions. Prior to
each acquisition of Oil and Gas Properties or other real property interests by
the Company or any Subsidiary after the Closing Date, the Company shall have
prepared (and shall timely deliver to the Administrative Agent) a Phase I Audit
pertaining to the Property being acquired. The Phase I Audit may be prepared by
the Company, unless the value of the Oil and Gas Properties or other real
property interests being acquired is greater than $25,000,000, in which case,
the Lenders may require the Company to engage an environmental consulting or
engineering firm to conduct the Phase I Audit. Such Phase I Audit shall be
completed and received by the Administrative Agent on or before 45 days
following the date the Company begins or engages said environmental consulting
or engineering firm.

      Section 6.05 Guarantors. In the event a Guarantor shall have executed a
Guaranty Agreement pursuant to Section 9.19, the Lenders' obligation to make
subsequent Loans or to

                                      -37-

<PAGE>

issue, renew, extend or reissue Letters of Credit shall be subject to the
Administrative Agent's receipt of the following documents:

            (a)   certificates of the Secretary or Assistant Secretary of such
Guarantor setting forth:

                  (i)   resolutions of its board of directors in form and
substance reasonably satisfactory to the Administrative Agent with respect to
the authorization of the Guaranty Agreement;

                  (ii)  the officers of such Guarantor who are authorized to
sign such Guaranty Agreement and who will, until replaced by another officer or
officers duly authorized for the purpose, act as a representative for the
purposes of signing documents and giving notices and other communications in
connection with such Guaranty Agreement and the transactions contemplated
thereby; and

                  (iii) specimen signatures of the officers so authorized.

The Administrative Agent and the Lenders may conclusively rely on such
certificate until the Administrative Agent receives notice in writing from such
Guarantor to the contrary;

            (b)   a copy, certified as true by the Secretary or Assistant
Secretary, of the organizational documents of such Guarantor;

            (c)   certificates of the appropriate state agencies with respect to
the valid existence and good standing of such Guarantor and the qualification of
each to do business as a foreign corporation in any jurisdiction in which the
ownership of Property or the nature of activities requires such qualification,
except where the failure so to qualify would not have a Material Adverse Effect;

            (d)   a Guaranty Agreement duly executed by such Guarantor; and

            (e)   an opinion of counsel to such Guarantor in form and substance
reasonably acceptable to the Administrative Agent.

                                  ARTICLE VII

                         Representations and Warranties

      The Company represents and warrants to the Lenders that (each
representation and warranty herein is given as of the date of this Agreement and
shall be deemed repeated and reaffirmed on the dates provided in Section 6.02):

      Section 7.01 Corporate Existence. The Company and each Subsidiary: (a) is
a corporation duly organized, validly existing and in good standing under the
laws of the jurisdiction in which it is incorporated (b) has all requisite
corporate power and authority, 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 (c) is

                                      -38-

<PAGE>

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.

      Section 7.02 Financial Condition.

            (a)   The audited financial statements of the Company for the period
ended December 31, 2003, heretofore furnished to each of the Lenders, present
fairly, in all material respects, the financial position of the Company and its
Subsidiaries as of such date and the results of its operations and its cash
flows for the period then ended in conformity with GAAP.

            (b)   Neither the Company nor any Subsidiary have had, on the
respective dates set forth above, any material 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 such Financial Statements or the notes thereto or
otherwise provided to the Administrative Agent and the Lenders in writing. Since
the date of the most recent financial statements of the Company delivered to the
Administrative Agent and each Lender, there has been no change or event having a
Material Adverse Effect, except as otherwise disclosed to the Administrative
Agent and the Lenders in writing on or before the Closing Date.

      Section 7.03 Liabilities; Litigation. Except for liabilities incurred in
the normal course of business, neither the Company nor any Subsidiary has any
material (individually or in the aggregate) liabilities, direct or contingent,
except as disclosed or referred to in the most recent financial statements of
the Company delivered to the Administrative Agent or as disclosed to the Lenders
in Schedule 7.03 hereto. Except as disclosed in Schedule 7.03, to the best of
the Company's knowledge and belief, as of the Closing Date, there is no
litigation, legal, administrative or arbitral proceeding, investigation or other
action of any nature pending or, to the knowledge of the Company threatened
against or affecting the Company or any Subsidiary which could reasonably be
expected to result in a Material Adverse Effect.

      Section 7.04 No Breach. Except for waivers or consents obtained in writing
by the Company prior to the Closing Date, neither the execution and delivery by
the Company of this Agreement, the Notes, or the other Security Instruments, nor
compliance with the terms and provisions hereof will conflict with or result in
a breach of, or require any consent under, the respective charter or by-laws of
the Company or any Subsidiary, or any applicable law or regulation, or any
order, writ, injunction or decree of any court or governmental authority or
agency, or any agreement or instrument to which the Company or any Subsidiary is
a party or by which the Company or any Subsidiary is bound or to which the
Company or any Subsidiary is 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 Company or any Subsidiary pursuant to
the terms of any such agreement or instrument.

      Section 7.05 Corporate Action. The Company is duly authorized and
empowered to create and issue the Notes; and the Company and each Subsidiary are
duly authorized and empowered to execute, deliver and perform the Security
Instruments, including this Agreement, to which they respectively are parties;
all corporate action on the Company's part requisite for

                                      -39-

<PAGE>

the due creation and issuance of the Notes and on the Company's and each
Subsidiary's respective part for the due execution, delivery and performance of
the Security Instruments, including this Agreement, to which the Company and
each Subsidiary respectively are parties has been duly and effectively taken;
and this Agreement does, and the Notes and other Security Instruments to which
the Company and each Subsidiary respectively are parties upon their creation,
issuance, execution and delivery will, constitute valid and binding obligations
of the Company and each Subsidiary, respectively, enforceable in accordance with
their terms.

      Section 7.06 Approvals. No authorizations, approvals or consents of, and
no filings or registrations with, any governmental or regulatory authority or
agency are necessary for the execution, delivery or performance by the Company
or any Subsidiary of this Agreement, the Notes, or the Security Instruments to
which they respectively are parties or for the validity or enforceability
thereof.

      Section 7.07 Use of Loans. The proceeds of the Loans shall be used by the
Company (i) to pay in full the indebtedness of the Company under the Existing
Credit Agreement, (ii) to provide working capital for the Company and its
Subsidiaries, and (iii) for general corporate purposes, including acquisitions
of Oil and Gas Properties and related items used or useful in connection with
the Company's existing business. Neither the Company nor any Subsidiary is
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 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 Company and the Subsidiaries 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 Company or any Subsidiary (whether directly or
indirectly) of (i) either a material civil penalty assessed pursuant to
subsections (c), (i) or (l) of section 502 of ERISA or a material 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 January 1, 1997. No
liability to the PBGC (other than for the payment of current premiums which are
not past due) by the Company or any Subsidiary has been or is expected by the
Company or any Subsidiary 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 material amounts
which the Company or the Subsidiaries is required under the terms of each Plan
or applicable law to have paid as contributions to such Plan as of the date
hereof, and no accumulated funding deficiency

                                      -40-

<PAGE>

(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
Company'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)   Neither the Company nor the Subsidiaries 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
Company or a Subsidiary in its sole discretion at any time without any material
liability.

            (h)   Neither the Company nor the Subsidiaries sponsors, maintains
or contributes to, or has at any time in the six-year period preceding the date
hereof sponsored, maintained or contributed to, any Multiemployer Plan.

            (i)   Neither the Company nor the Subsidiaries 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. To the best knowledge of the Company, KeySpan has
filed all United States Federal income Tax returns and all other material Tax
returns which are required to be filed with respect to the Company and its
Subsidiaries and all Taxes due pursuant to such returns or pursuant to any
assessment with respect to the Company and its Subsidiaries have been paid,
except for such assessments which are being contested in good faith by
appropriate proceedings. The charges, accruals and reserves on the books of the
Company and/or its Subsidiaries in respect of Taxes and other governmental
charges with respect to the Company and its Subsidiaries are, in the opinion of
the Company, adequate.

      Section 7.10 Titles, etc. The Company has and upon the Initial Funding
will have good and indefeasible title to its material (individually or in the
aggregate) Properties, free and clear of all Liens except Liens permitted by
Section 9.03, and Liens disclosed to the Lenders in Schedule 7.10. After giving
full effect to the Excepted Liens and Liens disclosed to the Lenders in Schedule
7.10, upon the Initial Funding, the Company will acquire and own the net
interests in production attributable to the wells and units reflected in the
Initial Reserve Report and the ownership of such Properties shall not in any
material respect obligate the Company 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 Initial
Reserve Report. Further, upon delivery of each reserve report furnished to the
Lenders pursuant to Sections 8.04(a) or (b) the statements made in the preceding
sentence shall be true with respect to such furnished reserve reports. All
information contained in the Initial Reserve Report is true and correct in all
material respects as of the date thereof and as of the date of the Initial
Funding.

                                      -41-

<PAGE>

      Section 7.11 No Material Misstatements. No material information,
statement, exhibit, certificate, document or report furnished to the Lenders by
the Company 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.

      Section 7.12 Investment Company Act. Neither the Company 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. The Company is a
"subsidiary company" of a "holding company," within the meaning of the Public
Utility Holding Company Act of 1935, as amended ("PUHCA"), but the Company's
financing under this Agreement does not violate Rule 52 under PUHCA.

      Section 7.14 Subsidiaries and Partnerships. The Company has no
Subsidiaries and no interest in any partnerships (excluding tax partnerships)
except those shown on Schedule 7.14 hereto, which Exhibit is complete and
accurate but which may be amended from time to time as set forth in this Section
7.14. The Company owns 100% of the issued and outstanding shares of stock of
each such Subsidiary, unless otherwise disclosed on Schedule 7.14. The Company
will forward to the Administrative Agent a revised Schedule 7.14 prior to or
concurrently with the delivery of the quarterly financial statements required to
be delivered pursuant to Section 8.01(b).

      Section 7.15 Location of Business and Offices. The Company's principal
place of business and chief executive offices are located at the address stated
on the signature page of this Agreement.

      Section 7.16 Gas Imbalances. Except as set forth on Schedule 7.16, as of
December 31, 2003, there were no gas imbalances, take or pay obligations, or
other prepayments with respect to any of the Company's or Subsidiaries' Oil and
Gas Properties which would require the Company or its Subsidiaries to deliver
Hydrocarbons produced from their respective Oil and Gas Properties at some
future time without then or promptly thereafter receiving full payment therefor
which would exceed 500 m.m.c.f. in the aggregate.

      Section 7.17 Rate Filings. To the best of the Company's knowledge, neither
the Company nor any Subsidiary has violated any provisions of The Natural Gas
Act or The Natural Gas Policy Act of 1978 or any other Federal or State law or
any of the regulations thereunder (including those of the respective
Conservation Commissions and Land Offices of the various jurisdictions having
authority over the Company's and the Subsidiaries' Oil and Gas Properties) with
respect to the Company's and the Subsidiaries' Oil and Gas Properties which
violation has had a Material Adverse Effect which is continuing or which in the
future could reasonably be expected to result in a Material Adverse Effect, and
the Company and each Subsidiary has or will have made all necessary rate
filings, certificate applications, well category filings, interim collection
filings and notices, and any other filings or certifications, and has or will
have received all necessary regulatory authorizations (including without
limitation necessary authorizations, if any, with respect to any processing
arrangements conducted by it or others

                                      -42-

<PAGE>

respecting the Company's and the Subsidiaries' Oil and Gas Properties or
production therefrom) required under said laws and regulations with respect to
all of the Company's and the Subsidiaries' Oil and Gas Properties or production
therefrom so as not to have a Material Adverse Effect. To the best of the
Company's knowledge, said material rate filings, certificate applications, well
category filings, interim collection filings and notices, and other filings and
certifications contain no untrue statements of material facts nor do they omit
any statements of material facts necessary in said filings.

      Section 7.18 Environmental Matters. Except for those matters disclosed in
Schedule 7.18, or such other matters which 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 such a Material Adverse Effect):

            (a)   None of the Properties owned by the Company or its
Subsidiaries or the operations conducted thereon violate any Environmental Laws
or the order of any court or Governmental Authority with respect to
Environmental Laws;

            (b)   Without limitation of clause (a) above, none of the Properties
owned by the Company or its Subsidiaries or the operations currently conducted
thereon or by any prior owner or operator of such Property or operation, are in
violation of or subject to any existing, pending or (to the knowledge of the
Company) threatened action, suit, investigation, inquiry or proceeding by or
before any court or Governmental Authority with respect to Environmental Laws 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 Company and its Subsidiaries, 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;

            (d)   All hazardous substances, if any, generated at any and all
Property of the Company and its Subsidiaries have in the past been transported,
treated and disposed of only by carriers maintaining valid permits under RCRA
and any other Environmental Law and only at treatment, storage and disposal
facilities maintaining valid permits under RCRA and any other Environmental Law,
which carriers and facilities have been and are operating in compliance with
such permits;

            (e)   The Company and each Subsidiary have taken all reasonable
steps necessary to determine and is determining (on a continuing basis) that no
hazardous substances or hazardous waste 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 Company and its Subsidiaries except in compliance with
Environmental Laws; and

            (f)   Neither the Company nor any Subsidiary has material contingent
liability in connection with any release or threatened release of any hazardous
substance or solid waste into the environment.

                                      -43-

<PAGE>

Each of the representations and warranties in this Section 7.18 is absolute to
the extent that it relates to any Property during the period such Property has
been owned by the Company or its Subsidiaries, and is made to the best of the
Company's knowledge as to any prior periods with respect to such Property.

      Section 7.19 Defaults. Neither the Company 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 (in any respect which would have a Material Adverse Effect)
under any material agreement or other instrument to which the Company or any
Subsidiary is a party or by which the Company or any Subsidiary is bound. No
Event of Default hereunder has occurred and is continuing.

      Section 7.20 Compliance with the Law. Neither the Company 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 their respective Properties or the conduct of their
respective 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.

      Section 7.21 Insurance. The Company has, and has caused its Subsidiaries
to have (a) all insurance policies sufficient for the compliance by each of them
with all Governmental Requirements, and (b) insurance coverage in at least such
amounts and against such risks (including public liability) that are usually
insured against by companies engaged in the same or a similar business under the
same or similar circumstances for the assets and operations of the Company and
its Subsidiaries. Schedule 7.21 sets forth the material insurance policies of
the Company and its Subsidiaries which are in full force and effect as of the
Closing Date.

      Section 7.22 Credit Agreements. Schedule 7.22 is a complete and correct
list, as of the Closing Date, of each credit agreement, loan agreement,
indenture, purchase agreement, guarantee or other arrangement providing for or
otherwise relating to any Debt of the Company, the principal or face amount of
which equals or exceeds (or may equal or exceed) $100,000, and the aggregate
principal or face amount outstanding or which may become outstanding under each
such arrangement is correctly described in such Schedule 7.22.

      Section 7.23 Solvency. The Company and its Subsidiaries, taken as a whole,
and the Company and each of its material Subsidiaries are Solvent, both before
and after the execution, delivery and performance of the Security Instruments,
including this Agreement.

      Section 7.24 Restriction on Liens. Neither the Company nor any of its
Subsidiaries is a party to any material agreement or arrangement, or subject to
any order, judgment, writ or decree, which either restricts or purports to
restrict its ability to grant Liens to the Administrative Agent and the Lenders
on or in respect of their Properties to secure the Indebtedness and the Security
Instruments.

                                  ARTICLE VIII

                              Affirmative Covenants

                                      -44-

<PAGE>

      So long as any of the Notes shall remain unpaid or any Lender shall have
any Commitment under this Agreement or any Letter of Credit shall remain
outstanding, the Company agrees that:

      Section 8.01 Financial Statements and Other Reports. The Company shall
deliver, or shall cause to be delivered, to each of the Lenders:

            (a)   As soon as available and in any event within 90 days after the
end of each calendar year (except as otherwise provided in Section 6.05), the
audited balance sheet of the Company and its Subsidiaries on a consolidated
basis as at the end of such calendar year, and the related audited statements of
operations, stockholders' equity and comprehensive income and cash flows of the
Company and its Subsidiaries on a consolidated basis for such calendar year, and
commencing with respect to the calendar year ended December 31, 2003, setting
forth in each case in comparative form the corresponding figures for the
preceding calendar year, and accompanied by the related opinion of Deloitte &
Touche LLP or such other independent public accountants of recognized national
standing acceptable to the Administrative Agent (without a "going concern" or
like qualification or exception and without any qualification or exception as to
the scope of such audit) which opinion shall state that said financial
statements present fairly, in all material respects, the financial position and
results of operations and its cash flows of the Company and its Subsidiaries as
at the end of, and for, such calendar year, and a certificate of such
accountants stating that, in making the examination necessary for their opinion,
they obtained no knowledge, except as specifically stated, of any Event of
Default.

            (b)   As soon as available and in any event within 60 days after the
end of each of the first three (3) quarterly periods of each calendar year, the
unaudited balance sheet of the Company and its Subsidiaries on a consolidated
basis as at the end of such period, and the related unaudited statements of
operations, stockholders' equity and comprehensive income and cash flows of the
Company and its Subsidiaries on a consolidated basis for such period and for the
period from the beginning of the respective calendar year to the end of such
period, and commencing with respect to the quarter ending March 31, 2004,
setting forth in each case in comparative form the corresponding figures for the
corresponding period in the preceding calendar year, accompanied by the
certificate of the senior financial officer of the Company, which certificate
shall state that said financial statements present fairly, in all material
respects, the financial position and results of operations and cash flows of the
Company and its Subsidiaries in conformity with GAAP, as at the end of, and for,
such period (subject to normal year-end audit adjustments).

            (c)   The Company will promptly furnish and will cause the
Subsidiaries and any ERISA Affiliate to promptly furnish to the Administrative
Agent (1) 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 subject to Title IV of ERISA or any trust
created thereunder, (2) 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 the President or the principal
financial officer of the Company, the Subsidiary or the ERISA Affiliate, as the
case may be, specifying the nature thereof, what action the Company, the
Subsidiary or the ERISA Affiliate is taking or proposes to take with respect

                                      -45-

<PAGE>

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 (3)
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, the Company will, and will cause each Subsidiary and ERISA
Affiliate to, (1) satisfy 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 (2) 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, in each case prior the imposition of any Lien or the posting of any bond
or other security or the incurrence of a material underpayment charge or
penalty.

            (d)   Promptly after the Company knows of any occurrence
constituting an Event of Default or having a Material Adverse Effect, a notice
of such Event of Default or Material Adverse Effect, describing the same in
reasonable detail and what action if any, the Company proposes to take in
response thereto.

            (e)   Promptly upon their becoming available, one copy of each
financial statement, report, notice or proxy statement sent by the Company or
any Subsidiary to stockholders generally, and of each regular or periodic report
and any registration statement, prospectus or written communication (other than
transmittal letters) in respect thereof filed by the Company or any Subsidiary
with or received by the Company or any Subsidiary in connection therewith from,
any securities exchange or the Securities and Exchange Commission or any
successor agency; provided, however, the foregoing shall not require the Company
to provide the Lenders copies of routine business reports sent by the Company to
its parent company in the ordinary course of business.

            (f)   From time to time such other information regarding the
business, affairs or financial condition of the Company 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; provided, however, that
notwithstanding this or any other provision of this Agreement, the access of any
and all of the Lenders, their agents and representatives to any information
shall at all times be subject to such limitations as the Company may reasonably
impose with respect to information that is subject to any confidentiality
restrictions, considered by it to be proprietary or subject to attorney-client
privilege.

            (g)   Promptly after the furnishing thereof, copies of any statement
or report furnished to any Person pursuant to the terms of any indenture, loan
or credit or other similar agreement (other than documents executed in
connection with this Agreement), and not otherwise required to be furnished to
the Lenders pursuant to any other provision of this Section 8.01.

The Company will furnish to each Lender, at the time it furnishes each set of
financial statements pursuant to paragraph (a) or (b) above, a certificate of a
senior financial officer of the Company (i) to the effect that no Event of
Default has occurred and is continuing (or, if any Event of Default has occurred
and is continuing, describing the same in reasonable detail), (ii) setting

                                      -46-

<PAGE>

forth in reasonable detail the computations necessary to determine whether the
Company is in compliance with all of the terms, conditions, agreements and
covenants contained in this Agreement including, without limitation, the
covenants contained in Sections 9.12 and 9.13 as of the end of the respective
fiscal quarter or calendar year, and (iii) a listing of all Hedging Agreements
entered into by the Company or under which the Company is obligated as of the
date of such certificate, showing the name of the counterparty, type of hedge,
floor, ceiling, volume, percentage of current hedge volume, term, margin
threshold and margin held for each such Hedging Agreement.

      Section 8.02 Litigation. The Company shall promptly give to each Lender
notice of all legal or arbitral proceedings, and of all proceedings before any
Governmental Authority, affecting the Company or any Subsidiary, except
proceedings which could not reasonably be expected to result in a Material
Adverse Effect.

      Section 8.03 Corporate Existence, Etc.

            (a)   The Company shall and shall cause each Subsidiary to (i)
preserve and maintain its corporate existence and all of its material rights,
privileges and franchises, except as otherwise permitted by Section 9.10 hereof;
(ii) 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; (iii) comply with the requirements of all applicable laws, rules,
regulations and orders of governmental or regulatory authorities if failure to
comply with such requirements would have a Material Adverse Effect; (iv) 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; (v) permit
representatives of any Lender or the Administrative Agent, during normal
business hours upon reasonable prior notice, 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 (vi) keep
insured by financially sound and reputable insurers all property of a character
usually insured by corporations 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 corporations and carry such other insurance
as is usually carried by such corporations.

            (b)   The Company will at its own expense do or cause to be done and
will cause each Subsidiary to do or cause to be done all things reasonably
necessary to preserve and keep in good repair, working order and efficiency all
Properties owned by the Company and each Subsidiary including, without
limitation, all 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 the Properties owned by the Company and
each Subsidiary will be fully preserved and maintained, ordinary wear and tear
excepted. The Company will and will cause each Subsidiary to operate their
respective Properties or cause or use best efforts to cause such Properties to
be operated 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

                                      -47-

<PAGE>

Governmental Requirements, except for any non-compliance that would not result
in a Material Adverse Effect.

      Section 8.04 Engineering and Other Reports.

            (a)   As soon as available and in any event prior to September 1 of
each calendar year, commencing on or before September 1, 2004, the Company shall
furnish to the Lenders a report (the "Reserve Report") in form and substance
satisfactory to the Lenders audited by an independent petroleum consultant(s)
acceptable to the Lenders, which Reserve Report shall evaluate as of the end of
the current calendar year the Oil and Gas Property of the Company, its
Affiliates and its Subsidiaries and which shall, together with any other
information reasonably requested by the Required Lenders, set forth the proved
oil and gas reserves attributable to such Property together with a projection of
the rate of production and future net income with respect thereto as of such
date, based upon the pricing assumptions consistent with Securities and Exchange
Commission reporting requirements at the time.

            (b)   As soon as available and in any event prior to February 1 of
each calendar year, the Company shall furnish to the Lenders a production report
prepared by the Company detailing by field the oil and gas volumes produced,
product price received, and lease operating expenses by month for the interim
six month period from the preceding March through September.

            (c)   If requested by the Required Lenders, the Company shall
furnish to the Lenders, within 45 days following such request, a report (the
"Alternate Reserve Report") in form and substance satisfactory to the Lenders
which may be prepared by or under the supervision of a petroleum engineer who
shall be an employee of the Company and certified by the chief engineer of the
Company as to its truth and accuracy and shall have been reviewed by the
independent petroleum consultant referred to in Section 8.04(a) above who shall
certify such report to have been prepared using customary engineering
disciplines, which shall further evaluate the Property evaluated in the
immediately preceding Reserve Report, and which shall, together with any other
information reasonably requested by the Required Lenders, set forth the proved
oil and gas reserves attributable to such Property as of September 1 or March 1,
as applicable, of the current calendar year, together with a projection of the
rate of production and net future income with respect thereto as of such date,
based upon the pricing assumptions consistent with Securities and Exchange
Commission reporting requirements at the time.

            (d)   Concurrently with the delivery of the reports required in
Subsections (a), (b) and (c) above, the Company shall provide to the Lenders:

                  (i)   a statement reflecting any material changes in the net
revenue interest of each well or lease as reflected in the immediately preceding
report after giving effect to all encumbrances from the net revenue interests as
reflected in such report, along with an explanation as to any material
discrepancies between the two net revenue interest disclosures; and

                  (ii)  a statement reflecting (A) all Oil and Gas Properties
acquired since the date of the immediately preceding report, and (B) all Oil and
Gas Properties reflected in the

                                      -48-

<PAGE>

immediately preceding report that have been sold or otherwise disposed of since
the date of such report; and

                  (iii) a report in form and substance satisfactory to the
Lenders prepared and certified by the chief financial officer of the Company,
which report shall, together with any other information requested by the
Required Lenders, fully set forth and disclose the volume, estimated amount and
nature of any and all gas imbalances with respect to the Oil and Gas Properties
of the Company and its Subsidiaries as of the previous quarterly date.

      Section 8.05 Further Assurances. The Company will cure and will cause each
Guarantor to cure promptly any defects in the creation and issuance of the Notes
and the execution and delivery of the Security Instruments, including this
Agreement. The Company at its expense will promptly execute and deliver to the
Administrative Agent, upon request, all such other and further documents,
agreements and instruments in compliance with or accomplishment of the covenants
and agreements of the Company in the Security Instruments, including 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 more fully state 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 Company will pay the Notes
according to the reading, tenor and effect thereof; and the Company will do and
perform every act and discharge all of the obligations provided to be performed
and discharged by the Company under the Security Instruments, including this
Agreement, at the time or times and in the manner specified.

                                   ARTICLE IX

                               Negative Covenants

      So long as any of the Notes shall remain unpaid or any Lender shall have
any Commitment under this Agreement or any Letter of Credit shall remain
outstanding, the Company shall not:

      Section 9.01 Debt. Create, incur, assume or suffer to exist, or permit any
of its Subsidiaries to create, incur, assume or suffer to exist any Debt,
except:

            (a)   Debt described in Schedule 9.01, including renewals,
extensions or refinancings thereof, provided that the principal amount thereof
does not increase;

            (b)   other Debt of the Company subordinated on terms satisfactory
to the Lenders to the Company's obligations under this Agreement and the Notes,
the Letters of Credit and Letter of Credit Agreements and any other Security
Instrument in an aggregate principal amount not to exceed $25,000,000 at any one
time outstanding;

                                      -49-

<PAGE>

            (c)   Debt of the Company to any Guarantor or any other Subsidiary
which becomes a Guarantor prior to the incurrence of such Debt, and Debt of any
Guarantor or any such Subsidiary to the Company or to any other Guarantor or any
such Subsidiary;

            (d)   Debt of the Company to any Subsidiary (other than a Guarantor
or any Subsidiary which becomes a Guarantor prior to the incurrence of such
Debt) or Debt of any Subsidiary (other than a Guarantor or any Subsidiary which
becomes a Guarantor prior to the incurrence of such Debt) to the Company in an
aggregate principal amount not exceeding $5,000,000 at any one time outstanding;

            (e)   accounts payable (other than for borrowed money) to trade
creditors for goods or services incurred in the ordinary course of business and
which are not in excess of 30 days past the due date, or, if greater than 30
days past due, are being contested in good faith and by appropriate proceedings;

            (f)   Debt of the Company and any Subsidiary (other than
newly-formed single purpose entity Subsidiaries created specifically for the
purpose of investing in project finance transactions) incurred to purchase or to
finance the purchase of, fixed assets in an aggregate principal amount not
exceeding as to the Company and its Subsidiaries $25,000,000 at any time
outstanding;

            (g)   Debt of the Company incurred in the ordinary course of
business in connection with performance bonds required of operators by the
Minerals Management Service or other state or governmental agencies which the
Company is required to post in connection with its activities as operator of Oil
and Gas Properties up to the aggregate amount of $25,000,000 at any one time
outstanding; provided, however, any outstanding utilization of performance bonds
in excess of $5,000,000 shall reduce the availability on a dollar-for-dollar
revolving basis of Revolving Credit Loans pursuant to Section 2.01(a);

            (h)   Debt of the Company in respect of judgment liens excepted
under Section 9.03;

            (i)   Debt of the Company and its Subsidiaries under Capital Leases
(and any extensions or renewals thereof or substitutions therefor) which do not
in the aggregate require the Company and its Subsidiaries on a consolidated
basis to make payments (including, without limitation, rent, taxes, insurance,
maintenance and similar expense which the Company or any Subsidiary is required
to pay under the terms of any Capital Lease) in any calendar year in excess of
$10,000,000;

            (j)   Debt of the Company under or in respect of the Indenture and
the Senior Subordinated Notes issued thereunder, and all amendments,
supplements, renewals, extensions or refinancings thereof; provided, however,
that (i) the aggregate principal amount of the Senior Subordinated Notes shall
not exceed $175,000,000, provided, however, that the Company may enter into
supplements to the Indenture having the effect of increasing the aggregate
principal amount of the Senior Subordinated Notes with the prior written consent
of the Required Lenders, (ii) payment of principal of, premium, if any, interest
and other amounts owing or to be owing under, in connection with or evidenced by
the Indenture or the Senior Subordinated Notes shall

                                      -50-

<PAGE>

be subordinated to the payment of the Indebtedness on terms substantially as
those set forth therein as of the Closing Date or otherwise reasonably
satisfactory to the Administrative Agent, (iii) any amendment, supplement,
renewal, extension or refinancing of the Indenture or any Senior Subordinated
Note shall be on terms, taken as a whole, no more restrictive to the Company
than the terms of the Indenture and the Senior Subordinated Notes as they exist
on the Closing Date, provided, further, however, with respect to subclause (ii)
hereof, the Indenture and the Senior Subordinated Notes may be prepaid with net
proceeds of an equity offering, provided, further, however, if any refinancing
of the Debt of the Company under or in respect of the Indenture or any Senior
Subordinated Note permitted by the terms of this Agreement results in the
Company receiving net proceeds in excess of the aggregate principal amount of
the Senior Subordinated Notes outstanding on the Closing Date, the Borrowing
Base shall be redetermined in accordance with Section 2.09;

            (k)   Debt of the Company in connection with the Letters of Credit
listed on Schedule 1.02(b); and

            (l)   the Notes or other Indebtedness or any guaranty of or
suretyship arrangement for the Notes or other Indebtedness.

      Section 9.02 Guaranties, Etc. Assume, guarantee, endorse or otherwise be
or become directly or contingently responsible or liable, or permit any of its
Subsidiaries to assume, guarantee, endorse or otherwise be or become directly or
indirectly responsible or liable (including, but not limited to, an agreement to
purchase any obligation, stock, assets, goods or services or to supply or
advance any funds, asset, goods or services, or an agreement to maintain or
cause such Person to maintain a minimum working capital or net worth or
otherwise to assure the creditors of any Person against loss) for the
obligations of any Person (except for Debt of the Company to the Administrative
Agent and/or the Lenders), except for guaranties by endorsement of negotiable
instruments for deposit or collection or similar transactions in the ordinary
course of business and guaranties of obligations of Subsidiaries that are
permitted to be incurred by the Subsidiaries under this Agreement.

      Section 9.03 Liens. Create, incur, assume or suffer to exist, or permit
any of its Subsidiaries to create, incur, assume or suffer to exist, any Lien,
upon or with respect to any of its properties, now owned or hereafter acquired,
except:

            (a)   Liens in favor of the Administrative Agent on behalf of the
Lenders securing the Indebtedness hereunder;

            (b)   Excepted Liens;

            (c)   Liens, deposits or pledges to secure the performance of bids,
tenders, contracts (other than contracts for the payment of money), leases
(permitted under the terms of this Agreement), public or statutory obligations,
surety, stay, appeal, indemnity, performance or other similar bonds, or other
similar obligations arising in the ordinary course of business;

            (d)   Judgment and other similar Liens arising in connection with
court proceedings; provided that (i) the execution or other enforcement of such
Liens is effectively stayed (ii) the claims secured thereby are being actively
contested in good faith and by

                                      -51-

<PAGE>

appropriate proceedings and (iii) such liens do not otherwise constitute an
Event of Default under Section 10.01(h);

            (e)   Liens covering real or personal property in existence at the
time of acquisition thereof by the Company or any Subsidiary after the Closing
Date, provided, that no such Lien covers, or is extended to cover, any other
property owned by the Company or any such Subsidiary after the Closing Date;

            (f)   Landowner's royalties, overriding royalties and other royalty
interests incurred in the ordinary course of business which, in the aggregate,
do not materially detract from the value of the Property burdened thereby or
interfere with the ordinary course of the business of the Company;

            (g)   Liens in existence on the Closing Date which are listed on
Schedule 7.10, provided, that no such Lien permitted by this clause (g) is
spread to cover any additional Property after the Closing Date and that the
amount of Debt secured thereby is not increased;

provided, however, that the Company may create, assume or suffer to exist any
Lien on the proved reserves or the probable reserves included in the Borrowing
Base of the type specified in clauses (b) through (e) and clause (g) above,
provided, that the Debt secured by such Liens shall not exceed $1,000,000 in the
aggregate at any one time outstanding;

            (h)   purchase money Liens on any Property hereafter acquired or the
assumption of or taking subject to any Lien on Property existing at the time of
such acquisition, or a Lien incurred in connection with any conditional sale or
other title retention agreement or a Capital Lease; provided that:

                  (i)   any Property subject to any of the foregoing is acquired
by the Company or any such Subsidiary in the ordinary course of its business and
the Lien on any such Property is created or assumed, or such Property is taken
subject to the Lien, contemporaneously with such acquisition or within 90 days
thereafter;

                  (ii)  the obligation secured by any such Lien shall not exceed
66-2/3% of the lesser of cost or fair market value as of the time of acquisition
of the Property covered thereby to the Company or such Subsidiary acquiring the
same;

                  (iii) each such Lien shall attach to no Property of the
Company or any Subsidiary other than the Property so acquired and fixed
improvements thereon;

                  (iv)  the principal amount of Debt secured by all such Liens
shall not exceed $25,000,000 at any time outstanding in the aggregate; and

                  (v)   the obligations secured by such Lien are permitted by
the provisions of Section 9.01(f); and

            (i)   Liens securing Capital Leases allowed under Section 9.01(i),
but only on the Property under lease.

                                      -52-

<PAGE>

      Section 9.04 Leases. Create, incur, assume or suffer to exist, or permit
any of its Subsidiaries to create, incur, assume or suffer to exist, any
obligation as lessee for the rental or hire of any real or personal property,
except the following and any extensions or renewals thereof or substitutions
therefor: (a) leases existing on the date of this Agreement; (b) operating
leases which do not in the aggregate require the Company and its Subsidiaries on
a consolidated basis to make payments (including, without limitation, rent,
taxes, insurance, maintenance and similar expense which the Company or any
Subsidiary is required to pay under the terms of any operating lease) in any
calendar year in excess of $10,000,000; (c) leases between the Company and any
Subsidiary or between any Subsidiaries and (d) oil and gas leases entered into
in the ordinary course of business.

      Section 9.05 Investments. Make, or permit any of its Subsidiaries to make,
any loan or advance to any Person or purchase or otherwise acquire, or permit
any such Subsidiary to purchase or otherwise acquire, any capital stock, assets,
obligations or other securities of, make any capital contribution to, or
otherwise invest in, or acquire any interest in, any Person, except: (a) direct
obligations of the United States of America or any agency thereof with
maturities of one year or less from the date of acquisition; (b) commercial
paper of a domestic issuer rated at least "A-2" by Standard & Poor's Ratings
Group, a division of The McGraw-Hill Companies, Inc. or "P-2" by Moody's
Investors Service, Inc. with maturities of one year or less from the date of
issuance; (c) certificates of deposit with maturities of one year or less from
the date of acquisition issued by any Lender or any commercial bank operating
within the United States of America having capital and surplus in excess of
$50,000,000; (d) short term deposits in money market funds investing
substantially in investments described in Sections 9.05(a), 9.05(b) or 9.05(c)
and the fund has an investment grade rating by Standard & Poor's Ratings Group,
a division of The McGraw-Hill Companies, Inc. or Moody's Investors Service, Inc.
or is listed on Schedule 9.05 (or comparable funds to those listed on Schedule
9.05); (e) for stock, obligations or securities received in settlement of debts
(created in the ordinary course of business) owing to the Company or any such
Subsidiary; (f) loans and advances to any Guarantor; (g) loans and advances to
employees in the ordinary course of business not to exceed $50,000 in the
aggregate at any one time outstanding; and (h) financing for interests in
Properties assigned or conveyed by the Company to executives of the Company
pursuant to employment agreements existing on the date hereof between such
executives and the Company.

      Section 9.06 Dividends. Declare or pay any dividends, purchase, redeem,
retire or otherwise acquire for value any of its capital stock now or hereafter
outstanding, or make any distribution of assets to its stockholders as such
whether in cash, assets or in obligations of the Company, or allocate or
otherwise set apart any sum for the payment of any dividend or distribution on,
or for the purchase, redemption or retirement of any shares of its capital
stock, or make any other distribution by reduction of capital or otherwise in
respect of any shares of its capital stock or permit any of its Subsidiaries to
purchase or otherwise acquire for value any stock of the Company or another such
Subsidiary, except that the Company may declare and pay cash dividends equal to
50% of net income over the most recent previous four quarters, if, after giving
effect to such dividend (a) no Event of Default has occurred and is continuing,
(b) no Event of Default will be caused by such action, (c) the Borrowing Base
Utilization is less than 80%, and (d) the Company has a ratio of Consolidated
Funded Debt to Consolidated Total Capitalization of less than 55%.

                                      -53-

<PAGE>

      Section 9.07 Sale of Assets. Without the prior written consent of all of
the Lenders, sell, lease, assign, transfer or otherwise dispose of, or permit
any of its Subsidiaries to sell, lease, assign, transfer or otherwise dispose
of, any of its now owned or hereafter acquired assets (including, without
limitation, shares of stock and indebtedness of such Subsidiaries, receivables
and leasehold interests); except: (a) for Oil and Gas Properties pursuant to
Section 9.15, (b) for inventory disposed of in the ordinary course of business;
(c) the sale or other disposition of assets no longer used or useful in the
conduct of its business; (d) that any such Subsidiary may sell, lease, assign,
or otherwise transfer its assets to the Company or any other Subsidiary; and (e)
any sale, lease, assignment, transfer or other disposition of Properties
pursuant to employment agreements with executives of the Company.

      Section 9.08 Stock of Subsidiaries, Etc. Sell or otherwise dispose of any
shares of capital stock of any of its Subsidiaries, except in connection with a
transaction permitted under Section 9.10, or permit any such Subsidiary to issue
any additional shares of its capital stock, except (a) directors' qualifying
shares, and (b) shares of its capital stock issued to the Company or another
Subsidiary.

      Section 9.09 Transactions with Affiliates. Enter into any transaction,
including, without limitation, the purchase, sale or exchange of Property or the
rendering of any service, with any Affiliate or permit any of its Subsidiaries
to enter into any transaction, including, without limitation, the purchase, sale
or exchange of property or the rendering of any service, with any Affiliate,
except (a) in the ordinary course of and pursuant to the reasonable requirements
of the Company's or such Subsidiary's business and upon fair and reasonable
terms no less favorable to the Company or such Subsidiary than would obtain in a
comparable arm's length transaction with a Person not an Affiliate, and (b) for
the sale, lease, assignment, transfer or other disposition of Properties
pursuant to employment agreements existing on the date hereof with executives of
the Company.

      Section 9.10 Mergers, Etc. Merge or consolidate with, or sell, assign,
lease or otherwise dispose of (whether in one transaction or in a series of
transactions) all or substantially all of its assets (whether now owned or
hereafter acquired) to, any Person, or acquire all or substantially all of the
assets or the business of any Person (or enter into any agreement to do any of
the foregoing), or permit any of its Subsidiaries to do so except that: (a) any
such Subsidiary may merge into or transfer assets to the Company; (b) any
Subsidiary may merge into or consolidate with or transfer assets to any other
Subsidiary; (c) the Company may merge or consolidate with another Person so long
as the Company is the surviving entity following such action and (d) no Default
or Event of Default exists after giving effect thereto.

      Section 9.11 Intentionally Omitted.

      Section 9.12 Interest Coverage Ratio. The Company will not permit its
Interest Coverage Ratio (calculated as of the last day of each fiscal quarter
for the then most recent four fiscal quarters of the Company) to be less than
3.00 to 1.00. For the purposes of this Section 9.12, "Interest Coverage Ratio"
shall mean the ratio of (i) EBITDA for the four fiscal quarters ending on the
last day of the most recent fiscal quarter of the Company to (ii) cash interest
payments made during such four fiscal quarters of the Company and its
Subsidiaries.

                                      -54-

<PAGE>

      Section 9.13 Funded Debt to EBITDA. At any time permit the ratio of
Consolidated Funded Debt to EBITDA to be greater than 3.50 to 1.00.

      Section 9.14 Negative Pledge Agreements. The Company will not create,
incur, assume or suffer to exist, or permit any Subsidiary to create, incur,
assume or suffer to exist, any contract, agreement or understanding (other than
this Agreement, the Security Instruments, the provisions of Section 4.7 of the
Indenture, and any contract or agreement evidencing an Excepted Lien, but only
with respect to the Property covered by such Excepted Lien) which in any way
prohibits or restricts the granting, conveying, creation or imposition of any
Lien on any Property of the Company or any Subsidiary, or which requires the
consent of or notice to other Persons in connection therewith, except customary
consents to assignment provisions contained in any instrument to which the
Company or a Subsidiary is a party, and in any conveyance thereof in the
Company's or any Subsidiaries' chain of title.

      Section 9.15 Sale of Oil and Gas Properties. The Company will not, nor
permit any Subsidiary or Affiliate to sell, assign, transfer or convey any
interest in any Oil and Gas Properties, except as follows:

            (a)   Hydrocarbons sold in the ordinary course of business as and
when produced;

            (b)   Routine farm-outs of non-proven acreage;

            (c)   Sales of Properties, provided the sales of all such Properties
permitted under this clause since the date of the last Scheduled Redetermination
of the Borrowing Base do not have a market value in excess of $25,000,000 in the
aggregate; and

            (d)   In addition to sales permitted above, sales of Properties
included in the Borrowing Base, provided simultaneously with any such sale the
Borrowing Base is reduced by amounts agreed to at the time by the Required
Lenders.

      Section 9.16 Environmental Matters. Except as disclosed in Schedule 7.18,
neither the Company 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, and the Company will promptly notify the Administrative Agent in
writing of any existing, pending or threatened (of which the Company has
knowledge) action or investigation by any Governmental Authority in connection
with any Environmental Laws, except for any such violations or remedial
obligations (individually or in the aggregate) which would not have a Material
Adverse Effect. The Company will establish and implement such procedures as may
be necessary to continuously determine and assure that (i) no solid wastes are
disposed of on any Property owned by the Company or any Subsidiary in quantities
or locations that would require remedial action under any Environmental Laws,
(ii) 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, (iii) no 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

                                      -55-

<PAGE>

the environment; (iv) all hazardous substances and solid wastes generated by the
Company or any Subsidiary or on any Property of the Company or any Subsidiary
will be transported only by carriers maintaining valid permits under RCRA and
treated, stored, and disposed of only by facilities operating in compliance with
RCRA, and (v) the Company, each Subsidiary and their respective Property and
operations will be maintained and operated in compliance with all permits,
licenses, and similar authorizations required pursuant to any Environmental
Laws, except for any non-compliance with clauses (i) through (v) of this Section
that would not have a Material Adverse Effect. The Company covenants and agrees
to keep or cause all of its and its Subsidiaries' Property to be kept free of
any hazardous waste or contaminants to the extent required by applicable
Environmental Laws, and either to remove the same (or if removal is prohibited
by law, to take whatever action is required by law) promptly upon discovery at
its sole expense or to take other appropriate response to the extent required by
applicable Environmental Laws.

      Section 9.17 ERISA Compliance. The Company and the Subsidiaries will not
at any time:

            (a)   engage in any transaction in connection with which the Company
or a Subsidiary could reasonably be expected to be subjected to either a
material civil penalty assessed pursuant to subsections (c), (i) or (l) of
section 502 of ERISA or a material tax imposed by Chapter 43 of Subtitle D of
the Code.

            (b)   terminate any Plan in a manner, or take any other action with
respect to any Plan, which could result in any material liability of the Company
or a Subsidiary to the PBGC.

            (c)   fail to make full payment when due of all amounts which, under
the provisions of any Plan, agreement relating thereto or applicable law, the
Company or a Subsidiary is required to pay as contributions thereto prior to the
imposition of any Lien or the posting of any bond or other security or the
incurrence of a material underpayment charge or penalty.

            (d)   permit to exist any material 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.

            (e)   permit the actuarial present value of the benefit liabilities
under any Plan maintained by the Company or a Subsidiary which is regulated
under Title IV of ERISA to exceed by more than $1.00 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 any
Multiemployer Plan.

            (g)   acquire an interest in any Person that causes such Person to
become an ERISA Affiliate with respect to the Company or a Subsidiary if such
Person sponsors, maintains

                                      -56-

<PAGE>

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 Plan that is subject to Title IV of ERISA under which the
actuarial present value of the benefit liabilities under such Plan exceeds by
more than $1.00 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 a material liability to or on account of a Plan or a
Multiemployer Plan under sections 515, 4062, 4063, 4064, 4201 or 4204 of ERISA.

            (i)   contribute to or assume an obligation to contribute to any
employee welfare benefit plan, as defined in section 3(1) of ERISA, that may not
be terminated by such entities in their sole discretion at any time without any
material liability.

            (j)   amend a Plan resulting in an increase in current liability
such that the Company or a Subsidiary is required to provide security to such
Plan under section 401(a)(29) of the Code.

      Section 9.18 Hedging Agreements. The Company will not enter into or become
obligated under, or permit any of its Subsidiaries to enter into or become
obligated under, any Hedging Agreement except for such agreements which in the
aggregate do not cover a volume of oil and gas (on a barrel of oil equivalent
basis) for any calendar year equal to more than 85% (on a barrel of oil
equivalent basis) of the projected production of oil and gas for such period
from the Oil and Gas Properties included in the Borrowing Base. For purposes of
this Section 9.18 only, put options, call options and functionally similar
instruments pursuant to which the Company's financial exposure is limited to the
initial premium or purchase price paid shall not be deemed to be Hedging
Agreements.

      Section 9.19 Subsidiaries and Partnerships. The Company shall not create
any additional Subsidiaries or partnerships or permit any Subsidiary to do so
without prior written notice to the Administrative Agent and the Lenders. In
every such case, each new Significant Subsidiary shall forthwith execute and
deliver a Guaranty Agreement in favor of the Administrative Agent.

      Section 9.20 Proceeds of Loans. The Company will not permit the proceeds
of the Loans to be used for any purpose other than those permitted by Section
7.07.

                                   ARTICLE X

                                Events of Default

      Section 10.01 Events of Default. If one or more of the following events
("Events of Default") shall occur and be continuing:

            (a)   (i) The Company shall default in the payment when due of any
principal of any Loan or of any reimbursement obligation for disbursement made
under any Letter of Credit or other amount payable by it hereunder, or (ii) the
Company shall default in the payment of any accrued interest on any Loan or on
any reimbursement obligation for disbursement made under any Letter of Credit or
other amount payable by it hereunder, or any fees due and payable

                                      -57-

<PAGE>

hereunder and such default in subclause (ii) shall continue unremedied for three
(3) Business Days after such occurrence; or

            (b)   The Company or any Subsidiary shall default in the payment
when due of any principal of or interest on any of its other Debt in an amount
aggregating $2,500,000, unless, in the case of trade creditors, such default is
being contested in good faith; or any non-monetary default specified in any
note, agreement, indenture or other document evidencing or relating to any other
Debt in an amount aggregating $2,500,000 of the Company or any Subsidiary shall
occur if the effect of such event is 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 other Security Instrument by the Company or any
Subsidiary, or any certificate furnished to any Lender or the Administrative
Agent pursuant to the provisions hereof or any other Security Instrument, shall
prove to have been false or misleading as of the time made or furnished in any
material respect; or

            (d)   The Company shall default in the performance of any of its
other obligations in this Agreement or under any Security Instrument, and such
default shall continue unremedied for a period of 30 days after notice thereof
to the Company by the Administrative Agent or any Lender (through the
Administrative Agent); provided, however, that the grace period referred to in
this Section 10.01(d) shall not apply (i) to the obligations of the Company to
promptly pay principal, interest and fees or (ii) to any of its obligations
under Article IX, except for its obligations under Sections 9.12 and 9.13 of
Article IX as to which Sections 9.12 and 9.13 such 30-day grace period shall
apply; or

            (e)   The Company shall admit in writing its inability to, or be
generally unable to, pay its Debts as such Debts become due; or

            (f)   The Company 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, 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
Federal 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 Company, in any court of competent jurisdiction,
seeking (i) its liquidation, reorganization, dissolution or winding-up, or the
composition or readjustment of its Debt, (ii) the appointment of a trustee,
receiver, custodian, liquidator or the like of the Company or of all or
substantially all of its assets, or (iii) similar relief in respect of the
Company under any law relating to bankruptcy, insolvency, reorganization,
winding-up, or composition or adjustment of Debt, and 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,

                                      -58-

<PAGE>

for a period of 90 days; or an order for relief against the Company shall be
entered in an involuntary case under the Federal Bankruptcy Code; or

            (h)   A final judgment or judgments for the payment of money in
excess of $2,500,000 in the aggregate shall be rendered by a court or courts
against the Company or any Subsidiary (which is not otherwise covered by
insurance) 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 Company or any 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)   An event or condition shall occur or exist with respect to any
employee pension benefit plan, as defined in Section 3(2) of ERISA (including,
without limitation, any "multiemployer plan" within the meaning assigned to such
term in Section 3(37) of ERISA), subject to Title IV of ERISA which is
sponsored, maintained or contributed to by the Company, any Subsidiary or any
ERISA Affiliate and, as a result of such event or condition, together with all
other such events and conditions, the Company, any Subsidiary or any ERISA
Affiliate shall incur, or in the opinion of the Required Lenders shall be
reasonably likely to incur, a liability to any such plan or to the PBGC (or any
combination of the foregoing) which, in the determination of the Required
Lenders, would result in a Material Adverse Effect; or

            (j)   Any Subsidiary takes, suffers or permits to exist as to such
Subsidiary any of the events or conditions referred to in Sections 10.01 (e),
(f), (g) or (h) hereof; or

            (k)   The occurrence of a Material Change without the written
consent of all of the Lenders; or

            (l)   The occurrence of any event having a Material Adverse Effect,
which remains unremedied for a period of 30 days after such occurrence; or

            (m)   The failure of the Company to satisfy any post Initial Loan
condition specified in Section 6.04 hereof on or before the deadline specified
therein, which remains unremedied for a period of 30 days after such occurrence;
or

            (n)   Any Guaranty Agreement or other Security Instrument shall at
any time after its execution and delivery and for any reason cease to be in full
force and effect or shall be declared null and void and the Guarantor thereunder
fails to execute an enforceable and effective Guaranty Agreement in replacement
thereof, or the validity or enforceability thereof shall be contested by the
Guarantor or the Guarantor shall deny it has any further liability or obligation
thereunder or shall fail to perform its obligations thereunder; or

            (o)   An "Event of Default" (as defined in the Indenture) occurs and
is continuing under the Indenture (including, without limitation, failure to pay
when due any amount owing under or in connection with the Indenture or a breach
of any other covenant or provision thereof);

                                      -59-

<PAGE>

THEREUPON: (i) in the case of an Event of Default other than one referred to in
clause (e), (f) or (g), or clause (j) to the extent it refers to clauses (e),
(f) or (g) of this Section 10.01, the Administrative Agent may and, upon request
of the Required Lenders, shall, by notice to the Company, cancel the Commitments
and/or declare the principal amount then outstanding of and the accrued interest
on the Loans and all other amounts payable by the Company hereunder and under
the Notes 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 Company; provided, however,
notwithstanding the foregoing waivers, the Administrative Agent will give the
Company one (1) Business Day's prior notice of the acceleration of Notes under
this clause (i); and (ii) in the case of the occurrence of an Event of Default
referred to in clause (e), (f) or (g), or clause (j) to the extent it refers to
clauses (e), (f) or (g), of this Section 10.01 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 Company
hereunder and under the Notes 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 Company.

      Section 10.02 Cash Collateral for Letters of Credit. Without limitation of
any right or remedy specified in Section 10.01, if any of the Indebtedness
(other than the LC Exposure) shall have become due and payable pursuant to the
immediately foregoing paragraph of Section 10.01, the Administrative Agent, upon
the request of the Required Lenders, shall, proceed to enforce remedies under
the Security Instruments. Upon realization of any of the collateral covered by
the Security Instruments, all such cash and cash proceeds shall be applied
first, to the payment of all unreimbursed fees and expenses outstanding
hereunder or under any of the other Security Instruments, then, to the amount of
outstanding balance of the Indebtedness, and then, held by the Administrative
Agent as cash collateral to secure the Company's obligation to reimburse the
Administrative Agent and the Lenders for drawings for the LC Exposure.

                                   ARTICLE XI

                                   The Agents

      Section 11.01 Appointment, Powers and Immunities. Each Lender hereby
irrevocably appoints and authorizes the Administrative Agent to act as its agent
hereunder with such powers as are specifically delegated to the Administrative
Agent by the terms of this Agreement, 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 own and its affiliates' officers,
directors, employees and agents): (a) shall have no duties or responsibilities
except those expressly set forth in this Agreement, and shall not by reason of
this Agreement be a trustee for any Lender; (b) 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, enforceability or sufficiency of this
Agreement, any Note or any other document referred to or provided for herein or
for any failure by the Company or any other Person to perform any of its
obligations hereunder or thereunder; (c) shall not be required to initiate or

                                      -60-

<PAGE>

conduct any litigation or collection proceedings hereunder; and (d) 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, even if such actions or omissions are foreseeably caused by
the ordinary negligence of the Administrative Agent, except for its own gross
negligence or willful misconduct. The Administrative Agent may employ agents and
attorneys-in-fact and shall not be responsible for the negligence or misconduct
of any such agents or attorneys-in-fact selected by it in good faith. 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 shall have been filed with the Administrative
Agent, together with the written consent of the Company to such assignment or
transfer.

      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, 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.
As to any matters not expressly provided for by this Agreement, the
Administrative Agent shall in all cases be fully protected in acting, or in
refraining from acting, hereunder in accordance with instructions signed by the
Required Lenders, and such instructions of the Required Lenders and any action
taken or failure to act pursuant thereto shall be binding on all of the Lenders.

      Section 11.03 Defaults. The Administrative Agent shall not be deemed to
have knowledge of the occurrence of an Event of Default (other than the
non-payment of principal of or interest on Loans or of fees) unless the
Administrative Agent has received notice from a Lender or the Company specifying
such Event of 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 an Event of Default, the Administrative Agent shall give prompt notice
thereof to the Lenders (and shall give each Lender and the Company prompt notice
of each such non-payment). The Administrative Agent shall (subject to Section
11.07) take such action with respect to such Event of Default as shall be
directed by the Required Lenders, 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 Event of Default as it shall deem
advisable in the best interest of the Lenders.

      Section 11.04 Rights as a Lender. Each bank serving as an Agent hereunder
shall have the same rights and powers in its capacity as a Lender as any other
Lender and may exercise the same as though it were not an Agent, and such bank
and its Affiliates may accept deposits from, lend money to and generally engage
in any kind of business with the Company or any Subsidiary or other Affiliate
thereof as if it were not an Agent hereunder.

      Section 11.05 Indemnification. The Lenders agree to indemnity the
Administrative Agent (to the extent not reimbursed under Section 12.03, but
without limiting the Obligations of the Company under said Section 12.03),
ratably in accordance with the aggregate principal amount of the Loans made by
the Lenders (or, if no Loans are at the time outstanding, ratably in

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accordance with their respective Commitments), for any and all 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 in any way relating
to or arising out of this Agreement or any other documents contemplated by or
referred to herein or the transactions contemplated hereby (including, without
limitation, the costs and expenses which the Company is obligated to pay under
Section 12.03 but excluding, unless an Event of Default has occurred and is
continuing, normal administrative costs and expenses incident to the performance
of its Agency duties hereunder or the enforcement of any of the terms hereof or
of any such other documents, 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 party to be indemnified.

      Section 11.06 Non-Reliance on Administrative Agent and other Lenders. Each
Lender agrees that it has, independently and without reliance on the
Administrative Agent, any other Agent or any other Lender, and based on such
documents and information as it has deemed appropriate, made its own credit
analysis of the Company and decision to enter into this Agreement and that it
will, independently and without reliance upon the Administrative Agent, any
other 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 Agents shall
not be required to keep themselves informed as to the performance or observance
by the Company of this Agreement or any other document referred to or provided
for herein or to inspect the Properties or books of the Company. Except for
notices, reports and other documents and information expressly required to be
furnished to the Lenders by the Administrative Agent hereunder, no Agent shall
have any duty or responsibility to provide any Lender with any credit or other
information concerning the affairs, financial condition or business of the
Company (or any of its affiliates) which may come into the possession of such
Agent or any of its Affiliates. In this regard, each Lender acknowledges that
Vinson & Elkins L.L.P. 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 Security Instrument. Each other party hereto will
consult with its own legal counsel to the extent that it deems necessary in
connection with the Security Instruments and the matters contemplated therein.

      Section 11.07 Failure to Act. Except for action 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 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.

      Section 11.08 Resignation or Removal of Agents. Subject to the appointment
and acceptance of a successor Agent as provided below, any Agent may resign at
any time by giving notice thereof to the Lenders and the Company and any Agent
may be removed at any time with or without cause by the Required Lenders. Upon
any such resignation or removal, the Required Lenders, with (so long as no
Default shall have occurred and be continuing) the consent (not to be
unreasonably withheld) of the Company, shall have the right to appoint a
successor. If no successor Agent shall have been so appointed by the Required
Lenders and shall have accepted such appointment within 30 days after the
retiring Agent's giving of notice of resignation or the

                                      -62-

<PAGE>

Required Lenders' removal of the retiring Agent, then the retiring Agent may, on
behalf of the Lenders, with (so long as no Default shall have occurred and be
continuing) the consent (not to be unreasonably withheld) of the Company,
appoint a successor Agent. Upon the acceptance of any appointment as Agent
hereunder by a successor Agent, such successor Agent shall thereupon succeed to
and become vested with all the rights, powers, privileges and duties of the
retiring Agent, and the retiring Agent shall be discharged from its duties and
obligations hereunder. After any retiring Agent's resignation or removal
hereunder as Agent, the provisions of this Section 11 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 Agent.

      Section 11.09 The Syndication Agents and Documentation Agents. The
Syndication Agents and the Documentation Agents shall have no duties,
responsibilities or liabilities under this Agreement and the other Security
Instruments other than their duties, responsibilities and liabilities in their
capacity as Lenders hereunder.

                                  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 this Agreement or any Note
shall operate as a waiver thereof, nor shall any single or partial exercise of
any right, power or privilege under this Agreement or any Note 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 Security Instruments (including, without limitation, any
modifications of, or waivers or consents under, this Agreement or the other
Security Instruments) shall be given or made by telex, telecopy, telegraph,
cable or in writing and telexed, telecopied, telegraphed, cabled, mailed or
delivered to the intended recipient as follows:

            (a)   if to the Company, to it at:

                  1100 Louisiana
                  Suite 2000
                  Houston, Texas 77002

                  Telecopier No.: 713/830-6810
                  Telephone No.: 713/830-6800

            (b)   if to the Administrative Agent, to it at:

                  1001 Fannin Street
                  Houston, Texas 77002

                  Telecopier No.: 713/650-6354

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                  Telephone No.: 713/346-2704

                  Attention: Jay Chernosky

                  with a copy to:

                  Address: 1001 Fannin Street
                           Houston, Texas 77002

                           Telecopier No.: 713/650-6354
                           Telephone No.: 713/346-2727
                           Attention: Debbie Blank

            (c)   if to the Issuing Bank or any other Lender, to it at its
address (or telecopier number) set forth in its Administrative Questionnaire;

 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 Security Instruments, all such communications shall be deemed to
have been duly given when transmitted by telex or telecopier, delivered to the
telegraph or cable office or personally delivered or, in the case of a mailed
notice, upon receipt, in each case given or addressed as aforesaid.

      Section 12.03 Expenses, Indemnity; Damage Waiver.

            (a)   The Company shall pay (i) all reasonable out-of-pocket
expenses incurred by the Administrative Agent and its Affiliates, including,
without limitation, the reasonable fees, charges and disbursements of counsel
and other outside consultants for the Administrative Agent, the reasonable
travel, photocopy, mailing, courier, telephone and other similar expenses, and
the cost of environmental audits and surveys and appraisals, in connection with
the syndication of the credit facilities provided for herein, the preparation,
negotiation, execution, delivery and administration (both before and after the
execution hereof and including advice of counsel to the Administrative Agent as
to the rights and duties of the Administrative Agent and the Lenders with
respect thereto) of this Agreement and the other Security Instruments and any
amendments, modifications or waivers of or consents related to the provisions
hereof or thereof (whether or not the transactions contemplated hereby or
thereby shall be consummated), (ii) all costs, expenses, taxes, assessments and
other charges incurred by the Administrative Agent or any Lender in connection
with any filing, registration, recording or perfection of any security interest
contemplated by this Agreement or any Security Instrument or any other document
referred to therein, (iii) all reasonable out-of-pocket expenses incurred by the
Issuing Bank in connection with the issuance, amendment, renewal or extension of
any Letter of Credit or any demand for payment thereunder, (iv) all
out-of-pocket expenses reasonably incurred by the Administrative Agent, the
Issuing Bank or any Lender, including the fees, charges and disbursements of any
counsel for the Administrative Agent, the Issuing Bank or any Lender, in
connection with the enforcement or protection of its rights in connection with
this Agreement or any other Security Instruments, including its rights under
this Section, or in connection with the Loans made or Letters of Credit issued
hereunder, including, without limitation, all such out-of-

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pocket expenses incurred during any workout, restructuring or negotiations in
respect of such Loans or Letters of Credit.

            (b)   THE COMPANY SHALL INDEMNIFY THE ADMINISTRATIVE AGENT, THE
ISSUING BANK AND EACH LENDER, AND EACH RELATED PARTY OF ANY OF THE FOREGOING
PERSONS (EACH SUCH PERSON BEING CALLED AN "INDEMNITEE") AGAINST, AND HOLD EACH
INDEMNITEE HARMLESS FROM, ANY AND ALL LOSSES, CLAIMS, DAMAGES, LIABILITIES AND
RELATED EXPENSES, INCLUDING THE FEES, CHARGES AND DISBURSEMENTS OF ANY COUNSEL
FOR ANY INDEMNITEE, INCURRED BY OR ASSERTED AGAINST ANY INDEMNITEE ARISING OUT
OF, IN CONNECTION WITH, OR AS A RESULT OF:

                  (i)   THE EXECUTION OR DELIVERY OF THIS AGREEMENT OR ANY OTHER
SECURITY INSTRUMENT OR ANY AGREEMENT OR INSTRUMENT CONTEMPLATED HEREBY OR
THEREBY, THE PERFORMANCE BY THE PARTIES HERETO OR THE PARTIES TO ANY OTHER
SECURITY INSTRUMENT OF THEIR RESPECTIVE OBLIGATIONS HEREUNDER OR THEREUNDER OR
THE CONSUMMATION OF THE TRANSACTIONS CONTEMPLATED HEREBY OR BY ANY OTHER
SECURITY INSTRUMENT,

                  (ii)  THE FAILURE OF THE COMPANY OR ANY SUBSIDIARY TO COMPLY
WITH THE TERMS OF ANY SECURITY INSTRUMENT, INCLUDING THIS AGREEMENT, OR WITH ANY
GOVERNMENTAL REQUIREMENT,

                  (iii) ANY INACCURACY OF ANY REPRESENTATION OR ANY BREACH OF
ANY WARRANTY OR COVENANT OF THE COMPANY OR ANY GUARANTOR SET FORTH IN ANY OF THE
SECURITY INSTRUMENTS OR ANY INSTRUMENTS, DOCUMENTS OR CERTIFICATIONS DELIVERED
IN CONNECTION THEREWITH,

                  (iv)  ANY LOAN OR LETTER OF CREDIT OR THE USE OF THE PROCEEDS
THEREFROM, INCLUDING, WITHOUT LIMITATION, (A) ANY REFUSAL BY THE ISSUING BANK TO
HONOR A DEMAND FOR PAYMENT UNDER A LETTER OF CREDIT IF THE DOCUMENTS PRESENTED
IN CONNECTION WITH SUCH DEMAND DO NOT STRICTLY COMPLY WITH THE TERMS OF SUCH
LETTER OF CREDIT, OR (B) THE PAYMENT OF A DRAWING UNDER ANY LETTER OF CREDIT
NOTWITHSTANDING THE NON-COMPLIANCE, NON-DELIVERY OR OTHER IMPROPER PRESENTATION
OF THE DOCUMENTS PRESENTED IN CONNECTION THEREWITH,

                  (v)   ANY OTHER ASPECT OF THE SECURITY INSTRUMENT,

                  (vi)  THE OPERATIONS OF THE BUSINESS OF THE COMPANY AND ITS
SUBSIDIARIES BY THE COMPANY AND ITS SUBSIDIARIES,

                  (vii) ANY ASSERTION THAT THE LENDERS WERE NOT ENTITLED TO
RECEIVE THE PROCEEDS RECEIVED PURSUANT TO THE SECURITY INSTRUMENTS,

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<PAGE>

                  (viii) ANY ENVIRONMENTAL LAW APPLICABLE TO THE COMPANY OR ANY
SUBSIDIARY OR ANY OF THEIR PROPERTIES, INCLUDING WITHOUT LIMITATION, THE
PRESENCE, GENERATION, STORAGE, RELEASE, THREATENED RELEASE, USE, TRANSPORT,
DISPOSAL, ARRANGEMENT OF DISPOSAL OR TREATMENT OF OIL, OIL AND GAS WASTES, SOLID
WASTES OR HAZARDOUS SUBSTANCES ON ANY OF THEIR PROPERTIES,

                  (ix)  THE BREACH OR NON-COMPLIANCE BY THE COMPANY OR ANY
SUBSIDIARY WITH ANY ENVIRONMENTAL LAW APPLICABLE TO THE COMPANY OR ANY
SUBSIDIARY,

                  (x)   THE PAST OWNERSHIP BY THE COMPANY OR ANY SUBSIDIARY OF
ANY OF THEIR PROPERTIES OR PAST ACTIVITY ON ANY OF THEIR PROPERTIES WHICH,
THOUGH LAWFUL AND FULLY PERMISSIBLE AT THE TIME, COULD RESULT IN PRESENT
LIABILITY,

                  (xi)  THE PRESENCE, USE, RELEASE, STORAGE, TREATMENT,
DISPOSAL, GENERATION, THREATENED RELEASE, TRANSPORT, ARRANGEMENT FOR TRANSPORT
OR ARRANGEMENT FOR DISPOSAL OF OIL, OIL AND GAS WASTES, SOLID WASTES OR
HAZARDOUS SUBSTANCES ON OR AT ANY OF THE PROPERTIES OWNED OR OPERATED BY THE
COMPANY OR ANY SUBSIDIARY OR ANY ACTUAL OR ALLEGED PRESENCE OR RELEASE OF
HAZARDOUS MATERIALS ON OR FROM ANY PROPERTY OWNED OR OPERATED BY THE COMPANY OR
ANY OF ITS SUBSIDIARIES,

                  (xii) ANY ENVIRONMENTAL LIABILITY RELATED IN ANY WAY TO THE
COMPANY OR ANY OF ITS SUBSIDIARIES,

                  (xiii) ANY OTHER ENVIRONMENTAL, HEALTH OR SAFETY CONDITION IN
CONNECTION WITH THE SECURITY INSTRUMENT, OR

                  (xiv) ANY ACTUAL OR PROSPECTIVE CLAIM, LITIGATION,
INVESTIGATION OR PROCEEDING RELATING TO ANY OF THE FOREGOING, WHETHER BASED ON
CONTRACT, TORT OR ANY OTHER THEORY AND REGARDLESS OF WHETHER ANY INDEMNITEE IS A
PARTY THERETO.

SUCH INDEMNITY SHALL EXTEND TO EACH INDEMNITEE 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 INDEMNITEES OR BY REASON OF STRICT
LIABILITY IMPOSED WITHOUT FAULT ON ANY ONE OR MORE OF THE INDEMNITEES; PROVIDED
THAT SUCH INDEMNITY SHALL NOT, AS TO ANY INDEMNITEE, BE AVAILABLE TO THE EXTENT
THAT SUCH LOSSES, CLAIMS, DAMAGES, LIABILITIES OR RELATED EXPENSES ARE
DETERMINED BY A COURT OF COMPETENT JURISDICTION BY

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FINAL AND NONAPPEALABLE JUDGMENT TO HAVE RESULTED FROM THE GROSS NEGLIGENCE OR
WILFUL MISCONDUCT OF SUCH INDEMNITEE.

            (c)   To the extent that the Company fails to pay any amount
required to be paid by it to the Administrative Agent or the Issuing Bank under
paragraph (a) or (b) of this Section, each Lender severally agrees to pay to the
Administrative Agent or the Issuing Bank, as the case may be, such Lender's
Applicable Percentage (determined as of the time that the applicable
unreimbursed expense or indemnity payment is sought) of such unpaid amount;
provided that the unreimbursed expense or indemnified loss, claim, damage,
liability or related expense, as the case may be, was incurred by or asserted
against the Administrative Agent or the Issuing Bank in its capacity as such.

            (d)   To the extent permitted by applicable law, the Company shall
not assert, and hereby waives, any claim against any Indemnitee, on any theory
of liability, for special, indirect, consequential or punitive damages (as
opposed to direct or actual damages) arising out of, in connection with, or as a
result of, this Agreement, any other Security Instrument or any agreement or
instrument contemplated hereby or thereby, any Loan or Letter of Credit or the
use of the proceeds thereof.

            (e)   All amounts due under this Section shall be payable after
written demand therefor.

      Section 12.04 Amendments, Etc. Any provision of this Agreement or any
other Security Instruments may be amended, modified or waived with the Required
Lenders' written consent; provided that no amendment, modification or waiver
which (i) extends the maturity of the Loans shall be effective without the
written consent of each Lender directly affected thereby, (ii) releases all or
substantially all of the collateral or the obligations of the Company or any
Guarantor shall be effective without the written consent of all Lenders, (iii)
modifies or waives the payment of any principal, interest, fees or other amount
due hereunder or under the Notes or any Letter of Credit or Letter of Credit
Agreement to any Lender shall be effective without the written consent of such
Lender, (iv) modifies or reduces the total Commitments of all of the Lenders
shall be effective without the written consent of all Lenders, (v) modifies or
reduces the Commitment of any Lender shall be effective without the written
consent of such Lender, (vi) decreases the interest rate applicable to the Loans
shall be effective without the written consent of each Lender directly affected
thereby, (vii) decreases the amount of any fees due to any Lender (or the
Administrative Agent for the benefit of the Lenders) hereunder shall be
effective without the written consent of each Lender directly affected thereby,
(viii) extends the expiration date of any Letter of Credit beyond the Drawdown
Termination Date without the written consent of all Lenders, (ix) amends this
Section 12.04 without the written consent of all Lenders, (x) modifies any
provision of this Agreement requiring the vote of 100% of the Lenders shall be
effective without the written consent of all Lenders or (xi) modify the
definition of "Required Lenders", "Change in Control" or "Material Change"
without written consent of all Lenders; provided further that no such agreement
shall amend, modify or otherwise affect the rights or duties of the
Administrative Agent hereunder without the prior written consent of the
Administrative Agent. The Company's written agreement is needed for any
amendment or modification of this Agreement or any other Security Instrument.

                                      -67-

<PAGE>

      Section 12.05 Successors and Assigns. The provisions of this Agreement
shall be binding upon and inure to the benefit of the parties hereto and their
respective successors and assigns permitted hereby (including any Affiliate of
the Issuing Bank that issues any Letter of Credit), except that (i) the Company
may not assign or otherwise transfer any of its rights or obligations hereunder
without the prior written consent of each Lender (and any attempted assignment
or transfer by the Company without such consent shall be null and void) and (ii)
no Lender may assign or otherwise transfer its rights or obligations hereunder
except in accordance with Section 12.06 Nothing in this Agreement, expressed or
implied, shall be construed to confer upon any Person (other than the parties
hereto, their respective successors and assigns permitted hereby (including any
Affiliate of the Issuing Bank that issues any Letter of Credit), Participants
(to the extent provided in paragraph (b) of Section 12.06) and, to the extent
expressly contemplated hereby, the Related Parties of each of the Administrative
Agent, the Issuing Bank and the Lenders) any legal or equitable right, remedy or
claim under or by reason of this Agreement.

      Section 12.06 Assignments and Participations.

            (a)   (i) Subject to the conditions set forth in paragraph (a)(ii)
below, any Lender may assign to one or more assignees all or a portion of its
rights and obligations under this Agreement (including all or a portion of its
Commitment and the Loans at the time owing to it) with the prior written consent
(such consent not to be unreasonably withheld) of:

                        (A)   the Company, provided that no consent of the
Company shall be required for an assignment to a Lender, an Affiliate of a
Lender, an Approved Fund (as defined below) or, if an Event of Default has
occurred and is continuing, any other assignee; and

                        (B)   the Administrative Agent, provided that no consent
of the Administrative Agent shall be required for an assignment to an assignee
that is a Lender immediately prior to giving effect to such assignment.

                  (ii)  Assignments shall be subject to the following additional
conditions:

                        (A)   except in the case of an assignment to a Lender or
an Affiliate of a Lender or an assignment of the entire remaining amount of the
assigning Lender's Commitment, the amount of the Commitment of the assigning
Lender subject to each such assignment (determined as of the date the Assignment
and Assumption with respect to such assignment is delivered to the
Administrative Agent) shall not be less than $5,000,000 unless each of the
Company and the Administrative Agent otherwise consent, provided that no such
consent of the Company shall be required if an Event of Default has occurred and
is continuing;

                        (B)   each partial assignment shall be made as an
assignment of a proportionate part of all the assigning Lender's rights and
obligations under this Agreement;

                        (C)   the parties to each assignment shall execute and
deliver to the Administrative Agent an Assignment and Assumption, together with
a processing and recordation fee of $3,500;

                                      -68-

<PAGE>

                        (D)   the assignee, if it shall not be a Lender, shall
deliver to the Administrative Agent an Administrative Questionnaire; and

                        (E)   in the case of an assignment to a CLO (as defined
below), the assigning Lender shall retain the sole right to approve any
amendment, modification or waiver of any provision of this Agreement, provided
that the Assignment and Assumption between such Lender and such CLO may provide
that such Lender will not, without the consent of such CLO, agree to any
amendment, modification or waiver described in the first proviso to Section
12.04 that affects such CLO.

      For the purposes of this Section 12.06, the terms "Approved Fund" and
"CLO" have the following meanings:

      "Approved Fund" means (a) a CLO and (b) with respect to any Lender that is
a fund which invests in bank loans and similar extensions of credit, any other
fund that invests in bank loans and similar extensions of credit and is managed
by the same investment advisor as such Lender.

      "CLO" means any entity (whether a corporation, partnership, trust or
otherwise) that is engaged in making, purchasing, holding or otherwise investing
in bank loans and similar extensions of credit in the ordinary course of its
business and is administered or managed by a Lender or an Affiliate of such
Lender.

                  (iii) Subject to acceptance and recording thereof pursuant to
paragraph (a)(v) of this Section, from and after the effective date specified in
each Assignment and Assumption the assignee thereunder shall be a party hereto
and, to the extent of the interest assigned by such Assignment and Assumption,
have the rights and obligations of a Lender under this Agreement, and the
assigning Lender thereunder shall, to the extent of the interest assigned by
such Assignment and Assumption, be released from its obligations under this
Agreement (and, in the case of an Assignment and Assumption covering all of the
assigning Lender's rights and obligations under this Agreement, such Lender
shall cease to be a party hereto but shall continue to be entitled to the
benefits of Section 5.01, Section 5.03, Section 5.05, Section 5.06 and Section
12.03). Any assignment or transfer by a Lender of rights or obligations under
this Agreement that does not comply with this Section 12.06 shall be treated for
purposes of this Agreement as a sale by such Lender of a participation in such
rights and obligations in accordance with paragraph (b) of this Section.

                  (iv)  The Administrative Agent, acting for this purpose as an
agent of the Company, shall maintain at one of its offices a copy of each
Assignment and Assumption delivered to it and a register for the recordation of
the names and addresses of the Lenders, and the Commitment of, and principal
amount of the Loans and disbursements under Letters of Credit owing to, each
Lender pursuant to the terms hereof from time to time (the "Register"). The
entries in the Register shall be conclusive, and the Company, the Administrative
Agent, the Issuing Bank and the Lenders may treat each Person whose name is
recorded in the Register pursuant to the terms hereof as a Lender hereunder for
all purposes of this Agreement, notwithstanding notice to the contrary. The
Register shall be available for inspection by the

                                      -69-

<PAGE>

Company, the Issuing Bank and any Lender, at any reasonable time and from time
to time upon reasonable prior notice.

                  (v)   Upon its receipt of a duly completed Assignment and
Assumption executed by an assigning Lender and an assignee, the assignee's
completed Administrative Questionnaire (unless the assignee shall already be a
Lender hereunder), the processing and recordation fee referred to in paragraph
(a) of this Section and any written consent to such assignment required by
paragraph (a) of this Section, the Administrative Agent shall accept such
Assignment and Assumption and record the information contained therein in the
Register. No assignment shall be effective for purposes of this Agreement unless
it has been recorded in the Register as provided in this paragraph.

            (b)   (i) Any Lender may, without the consent of the Company, the
Administrative Agent or the Issuing Bank, sell participations to one or more
banks or other entities (a "Participant") in all or a portion of such Lender's
rights and obligations under this Agreement (including all or a portion of its
Commitment and the Loans owing to it); provided that (A) such Lender's
obligations under this Agreement shall remain unchanged, (B) such Lender shall
remain solely responsible to the other parties hereto for the performance of
such obligations and (C) the Company, the Administrative Agent, the Issuing Bank
and the other Lenders shall continue to deal solely and directly with such
Lender in connection with such Lender's rights and obligations under this
Agreement. Any agreement or instrument pursuant to which a Lender sells such a
participation shall provide that such Lender shall retain the sole right to
enforce this Agreement and to approve any amendment, modification or waiver of
any provision of this Agreement. In addition such agreement must provide that
the Participant be bound by the provisions of Section 12.03. Subject to
paragraph (b)(ii) of this Section, the Company agrees that each Participant
shall be entitled to the benefits of Section 5.01, Section 5.03, Section 5.05
and Section 5.06 to the same extent as if it were a Lender and had acquired its
interest by assignment pursuant to paragraph (a) of this Section. To the extent
permitted by law, each Participant also shall be entitled to the benefits of
Section 12.15 as though it were a Lender, provided such Participant agrees to be
subject to Section 4.05 as though it were a Lender.

                  (i)   A Participant shall not be entitled to receive any
greater payment under Section 5.01, Section 5.05 or Section 5.06 than the
applicable Lender would have been entitled to receive with respect to the
participation sold to such Participant. A Participant that would be a Foreign
Lender if it were a Lender shall not be entitled to the benefits of Section 5.06
unless the Company is notified of the participation sold to such Participant and
such Participant agrees, for the benefit of the Company, to comply with Section
5.06(e) as though it were a Lender.

            (c)   Any Lender may at any time pledge or assign a security
interest in all or any portion of its rights under this Agreement to secure
obligations of such Lender, including any pledge or assignment to secure
obligations to a Federal Reserve Bank, and this Section shall not apply to any
such pledge or assignment of a security interest; provided that no such pledge
or assignment of a security interest shall release a Lender from any of its
obligations hereunder or substitute any such pledgee or assignee for such Lender
as a party hereto.

                                      -70-

<PAGE>

      Section 12.07 Invalidity. In the event that any one or more of the
provisions contained in the Notes, this Agreement or in any other Security
Instrument 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 Security
Instrument.

      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. 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 Subsection shall be deemed to refer to the
applicable Section or Subsection of this Agreement unless otherwise stated
herein. Any reference herein to an exhibit or schedule shall be deemed to refer
to the applicable exhibit or schedule attached hereto unless otherwise stated
herein.

      Section 12.10 Termination of Agreement; Survival of Obligations.

            (a)   This Agreement and the Security Instruments shall terminate
and cease to be of legal force and effect upon the payment in full of the
Indebtedness and the termination of the Commitments. To the extent that any
payments on the Indebtedness or proceeds of the 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
Indebtedness so satisfied shall be revived and continue as if such payment or
proceeds had not been received by the Administrative Agent or the Lenders, and
the security interests, rights, powers and remedies of the Administrative Agent
and the Lenders under this Agreement and the Security Instruments shall continue
in full force and effect. In such event, this Agreement shall be automatically
reinstated pursuant to the terms of Subsection 12.10(b) if it shall theretofore
have been terminated.

            (b)   The grant of a security interest under the Security
Instruments and all of the Administrative Agent's and the Lenders' rights,
powers and remedies under this Agreement and under the Security Instruments
shall remain in full force and effect until the Administrative Agent has
retransferred and delivered all collateral described therein in its possession
to the Company, including without limitation all shares of stock, and executed a
written release or termination statement and reassigned to the Company without
recourse or warranty any remaining collateral, including without limitation all
shares of stock, and all rights conveyed hereby. Upon the complete payment of
the Indebtedness and the compliance by the Company with all covenants and
agreements hereof, each Lender, at the written request and expense of the
Company, will deliver to the Company the Notes marked "paid" or with such other
notation as is appropriate and will release, reassign and transfer any
collateral, including without limitation all shares of stock, to the Company or
such other Person as is appropriate and declare this Agreement and the Security
Instruments to be of no further force or effect. Notwithstanding the foregoing,
the obligations of the Company under Sections 5.01, 5.05 and 12.03 shall survive
the repayment of the Loans and the termination of the Commitments.

                                      -71-

<PAGE>

      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 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 THAT
CHAPTER 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.

            (b)   ANY LEGAL ACTION OR PROCEEDING WITH RESPECT TO THIS AGREEMENT,
THE NOTES OR THE OTHER SECURITY INSTRUMENTS MAY BE BROUGHT IN THE COURTS OF THE
STATE OF TEXAS OR OF THE UNITED STATES OF AMERICA FOR THE SOUTHERN DISTRICT OF
TEXAS, AND, BY EXECUTION AND DELIVERY OF THIS AGREEMENT, THE COMPANY 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 COMPANY 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 NONEXCLUSIVE AND DOES NOT PRECLUDE THE ADMINISTRATIVE AGENT OR
ANY LENDER FROM OBTAINING JURISDICTION OVER THE COMPANY IN ANY COURT OTHERWISE
HAVING JURISDICTION.

      Section 12.13 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 Texas 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 the
Notes, this Agreement or in any other Security Instrument or 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 the Notes, this Agreement or under any of the
other aforesaid Security Instruments 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 cancelled automatically and if
theretofore paid shall be credited by such Lender on the principal amount of the
Indebtedness (or, to the extent that the principal amount of the Indebtedness
shall have been or would thereby be paid in full, refunded by such Lender to the
Company); 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 cancelled automatically by such Lender as of the
date of

                                      -72-

<PAGE>

such acceleration or prepayment and, if theretofore paid, shall be credited by
such Lender on the principal amount of the Indebtedness (or, to the extent that
the principal amount of the Indebtedness shall have been or would thereby be
paid in full, refunded by such Lender to the Company). 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 in equal parts 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 12.13 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.

      To the extent that Section 303.001 of the Texas Finance Code is relevant
to any Lender for the purpose of determining the Highest Lawful Rate, each such
Lender hereby elects to determine the applicable rate ceiling under such Section
by the weekly rate ceiling from time to time in effect.

      Section 12.14 Waiver of Jury Trial. Each of the parties hereto waives, to
the fullest extent permitted by applicable law, any right to a trial by jury in
any action or proceeding to enforce or to defend any rights under this
Agreement, the Notes or any other Security Instrument or under any amendment,
instrument, document or agreement delivered or which may in the future be
delivered in connection herewith or therewith or arising from any relationship
existing in connection with this Agreement, the Notes or any other Security
Instrument and agrees that any such action or proceeding shall be tried before a
court and not before a jury.

      Section 12.15 Right of Setoff. If an Event of Default shall have occurred
and be continuing, each Lender and each of its Affiliates is hereby authorized
at any time and from time to time, to the fullest extent permitted by law, to
set off and apply any and all deposits (general or special, time or demand,
provisional or final) at any time held and other obligations (of whatsoever
kind, including, without limitations obligations under Hedging Agreements) at
any time owing by such Lender or Affiliate to or for the credit or the account
of the Company or any Subsidiary against any of and all the obligations of the
Company or any Subsidiary now or hereafter existing under this Agreement or any
other Security Instrument held by such Lender, irrespective of whether or not
such Lender shall have made any demand under this Agreement or any other
Security Instrument and although such obligations may be unmatured. The rights
of each Lender under this Section are in addition to other rights and remedies
(including other rights of setoff) which such Lender may have.

      Section 12.16 Existing Credit Agreement. On the date of the Initial
Funding, the loans and other Debt of the Company under the Existing Credit
Agreement shall be paid in full with

                                      -73-

<PAGE>

the proceeds of the Initial Funding; and this Agreement and the Commitments of
the Lenders hereunder shall succeed and replace the Existing Credit Agreement
and the commitments of the lenders thereunder.

      Section 12.17 Exculpation Provisions. Each of the parties hereto
specifically agrees that it has a duty to read this Agreement and the other
Security Instruments and agrees that it is charged with notice and knowledge of
the terms of this Agreement and the other Security Instruments; that it has in
fact read this Agreement and is fully informed and has full notice and knowledge
of the terms, conditions and effects of this Agreement; that it has been
represented by independent legal counsel of its choice throughout the
negotiations preceding its execution of this Agreement and the other Security
Instruments; and has received the advice of its attorney in entering into this
Agreement and the other Security Instruments; and that it recognizes that
certain of the terms of this Agreement and the other Security Instruments result
in one party assuming the liability inherent in some aspects of the transaction
and relieving the other party of its responsibility for such liability. Each
party hereto agrees and covenants that it will not contest the validity or
enforceability of any exculpatory provision of this Agreement and the other
Security Instruments on the basis that the party had no notice or knowledge of
such provision or that the provision is not "conspicuous."

      Section 12.18 Confidentiality. Each of the Agents, the Issuing Bank and
the Lenders agrees to maintain the confidentiality of the Information (as
defined below), except that Information may be disclosed (a) to its and its
Affiliates' directors, officers, employees and agents, including accountants,
legal counsel and other advisors (it being understood that the Persons to whom
such disclosure is made will be informed of the confidential nature of such
Information and instructed to keep such Information confidential), (b) to the
extent requested by any regulatory authority, (c) to the extent required by
applicable laws or regulations or by any subpoena or similar legal process, (d)
to any other party to this Agreement or any other Security Instrument, (e) in
connection with the exercise of any remedies hereunder or under any other
Security Instrument or any suit, action or proceeding relating to this Agreement
or any other Security Instrument or the enforcement of rights hereunder or
thereunder, (f) subject to an agreement containing provisions substantially the
same as those of this Section 12.18, to (i) any assignee of or Participant in,
or any prospective assignee of or Participant in, any of its rights or
obligations under this Agreement or (ii) any actual or prospective counterparty
(or its advisors) to any Hedging Agreement relating to the Company and its
obligations, (g) with the consent of the Company or (h) to the extent such
Information (i) becomes publicly available other than as a result of a breach of
this Section 12.18 or (ii) becomes available to any Agent, the Issuing Bank or
any Lender on a nonconfidential basis from a source other than the Company. For
the purposes of this Section 12.18, "Information" means all information received
from the Company or any Subsidiary relating to the Company or any Subsidiary and
their businesses, other than any such information that is available to any
Agent, the Issuing Bank or any Lender on a nonconfidential basis prior to
disclosure by the Company or a Subsidiary; provided that, in the case of
information received from the Company or any Subsidiary after the date hereof,
such information is clearly identified at the time of delivery as confidential.
Any Person required to maintain the confidentiality of Information as provided
in this Section 12.18 shall be considered to have complied with its obligation
to do so if such Person has exercised the same degree of care to maintain the
confidentiality of such Information as such Person would accord to its own
confidential information.

                                      -74-

<PAGE>

      SECTION 12.19 NO ORAL AGREEMENTS. THIS WRITTEN AGREEMENT, THE NOTES, AND
THE OTHER SECURITY INSTRUMENTS 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 AMONG THE
PARTIES.

      Section 12.20 USA Patriot Act Notice. Each Lender hereby notifies the
Company that pursuant to the requirements of the USA Patriot Act (Title III of
Pub. L. 107-56 (signed into law October 26, 2001)) (the "Act"), it is required
to obtain, verify and record information that identifies the Company, which
information includes the name and address of the Company and other information
that will allow such Lender to identify the Company in accordance with the Act.

                                      -75-

<PAGE>

      The parties hereto have caused this Agreement to be duly executed as of
the day and year first above written.

                                COMPANY:

                                THE HOUSTON EXPLORATION COMPANY

                                By: /s/ John H. Karnes
                                    -----------------------------
                                Name: John H. Karnes
                                Title: Sr. VP and Chief Financial Officer

                                LENDERS AND AGENTS:

                              WACHOVIA BANK, NATIONAL ASSOCIATION, Individually
                              as a Lender, the Issuing Bank and as
                              Administrative Agent

                             By: /s/ David Humphreys
                                 --------------------------------
                             Name: David Humphreys
                             Title: Director

                                THE  BANK OF NOVA SCOTIA, Individually as a
                                Lender and as Co-Syndication Agent

                                By: /s/ Nadine Bell
                                    -----------------------------
                                Name: Nadine Bell
                                Title: Senior Manager

                                FLEET NATIONAL BANK, Individually
                                as a Lender and as Co-Syndication Agent

                                By: /s/ Mark A. Serice
                                    -----------------------------
                                Name: Mark A. Serice
                                Title: Vice President

                                BNP PARIBAS, Individually as a Lender and as
                                Co-Documentation Agent

                                By: /s/ Betsy Jocher
                                    -----------------------------
                                Name: Betsy Jocher
                                Title: Vice President

                                By: /s/ Polly Schott
                                    -----------------------------
                                Name: Polly Schott
                                Title: Vice President

                    [Signature Page 76 to Credit Agreement]

<PAGE>

                                COMERICA BANK, Individually as a Lender and as
                                Co-Documentation Agent

                                By: /s/ H. Vadgama
                                    -----------------------------
                                Name: Huma Vadgama
                                Title: Assistant Vice President

                                THE BANK OF NEW YORK

                                By: /s/ Craig J. Anderson
                                    -----------------------------
                                Name: Craig J. Anderson
                                Title: Vice President

                                COMPASS BANK

                                By: /s/ Patrick McWilliams
                                    -----------------------------
                                Name: Patrick McWilliams
                                Title: Assistant Vice President

                                WASHINGTON MUTUAL BANK, FA

                                By: /s/ Mark Isensee
                                    -----------------------------
                                Name: Mark Isensee
                                Title: Vice President

                                UNION BANK OF CALIFORNIA, N.A.

                                By: /s/ Sean Murphy
                                    -----------------------------
                                Name: Sean Murphy
                                Title: Vice President

                                NATEXIS BANQUES POPULAIRES

                                By: /s/ Donovan C. Broussard
                                    -----------------------------
                                Name: Donovan C. Broussard
                                Title: Vice President & Manager

By:                             By: /s/ Timothy Polvado
                                    -----------------------------
                                Name: Timothy Polvado
                                Title: Vice President & Manager

                                SOUTHWEST BANK OF TEXAS, N.A.

                                By: /s/ W. Bryan Chapman
                                    -----------------------------
                                Name: W. Bryan Chapman
                                Title: Senior Vice President Energy Lending

                    [Signature Page 77 to Credit Agreement]

<PAGE>

                                WELLS FARGO BANK TEXAS, N.A.

                                By: /s/ Carlos L. Quinteros
                                    -----------------------------
                                Name: Carlos L. Quinteros
                                Title: RelationshipManager

                    [Signature Page 78 to Credit Agreement]

</TEXT>
</DOCUMENT>
