Document:

exv4w2

 

Exhibit 4.2

TRANSOCEAN INC.

Officers’ Certificate

     The undersigned, Eric B. Brown and Randal P. Miller, do hereby certify that they are the duly
appointed and acting Senior Vice President, General Counsel and Corporate Secretary and Vice
President and Treasurer, respectively, of Transocean Inc., a Cayman Islands exempted company (the
“Company”). Each of the undersigned also hereby certifies, pursuant to Sections 103 and 301 of the
Indenture, dated as of April 15, 1997, as amended and supplemented by the First Supplemental
Indenture, Second Supplemental Indenture, Third Supplemental Indenture and Fourth Supplemental
Indenture thereto, dated as of April 15, 1997, May 14, 1999, May 24, 2000 and May 11, 2001,
respectively (together, the “Indenture”), between the Company and The Bank of New York Trust
Company, N.A., as successor Trustee (the “Trustee”), that:

     A. There is hereby established pursuant to resolutions duly adopted by the Board of Directors
of the Company on August 28, 2006 (a copy of such resolutions being attached hereto as Exhibit A) a
series of Securities (as that term is defined in the Indenture) to be issued under the Indenture
designated “Floating Rate Notes due 2008” (the “Notes”).

     B. The terms and form of the Notes shall be as set forth in Exhibit B and Exhibit C,
respectively.

     C. Each of the undersigned has read the provisions of Section 301 and 303 of the Indenture and
the definitions relating thereto and the resolutions adopted by the Board of Directors of the
Company referred to above. In the opinion of each of the undersigned, he has made such examination
or investigation as is necessary to enable him to express an informed opinion as to whether or not
all conditions precedent provided in the Indenture relating to the establishment, authentication
and delivery of the Notes have been complied with.

     D. In the opinion of each of the undersigned, all such conditions precedent have been complied
with.

 

     IN WITNESS WHEREOF, the undersigned have hereunto executed this Certificate as of September 5,
2006.

	 	 	 	 	 
	 

	 	 	 	 
	 

	 	Eric B. Brown
	 	 
	 

	 	Senior Vice President, General Counsel and	 	 
	 

	 	Corporate Secretary	 	 
	 
	 	 	 	 
	 
	 	 	 	 
	 

	 	 	 	 
	 

	 	Randal P. Miller	 	 
	 

	 	Vice President and Treasurer	 	 

2

 

EXHIBIT B

TRANSOCEAN INC.

Floating Rate Notes due 2008

     The title of the Securities of the series shall be “Floating Rate Notes due 2008” (the
“Notes”).

     1. The aggregate principal amount of the Notes which may be authenticated and delivered under
the Indenture is unlimited.

     2. The Company may, without the consent of the existing holders of the Notes, issue additional
Notes having the same ranking and the same interest rate, maturity and other terms as the Notes.
Any additional Notes having such similar terms, together with the Notes, will constitute a single
series of Notes under the Indenture.

     3. Interest on the Notes shall be payable to the persons in whose name the Notes are
registered at the close of business on the Regular Record Date (as defined in the Indenture) for
such interest payment.

     4. The date on which the principal of the Notes is payable, unless accelerated pursuant to the
Indenture, shall be September 5, 2008.

     5. The rate at which each of the Notes shall bear interest shall be a floating rate equal to
the three month LIBOR rate, reset quarterly, plus 20 basis points, per year. The date from which
interest shall accrue for each of the Notes shall be September 5, 2006. The Interest Payment Dates
on which interest on the Notes shall be payable are March 5, June 5, September 5 and December 5,
commencing on December 5, 2006, to the person in whose name a Note is registered at the close of
business on the February 15, May 15, August 15 and November 15, respectively, that immediately
precedes the date on which interest will be paid, subject to specified exceptions. The per annum
interest rate for the period from the issue date to the first LIBOR Rate Reset Date (as defined
below) will be equal to the three month LIBOR Rate on September 1, 2006 plus 20 basis points
(0.20%) (the “Initial Interest Rate”). Such interest rate will be reset on March 5, June 5,
September 5 and December 5 of each year, beginning on December 5, 2006 (each, a “LIBOR Rate Reset
Date”).

     If any LIBOR Rate Reset Date falls on a day that is not a business day, the LIBOR Rate Reset
Date will be postponed to the next day that is a business day, except that if that business day is
in the next succeeding calendar month, the LIBOR Rate Reset Date will be the next preceding
business day. As used herein, “business day” means any day other than a Saturday or Sunday, a day
on which banks in New York, New York are authorized or obligated by law or executive order to
remain closed or a day on which the corporate trust office of the Calculation Agent is closed for
business. The interest rate in effect on any LIBOR Rate Reset Date will be the applicable rate as
reset on that date.

B-1

 

The interest rate applicable to any other day will either be the Initial Interest Rate or the
interest rate as reset on the immediately preceding LIBOR Rate Reset Date.

     The “Three Month LIBOR Rate” means the rate determined in accordance with the following
provisions:

     (1) On the LIBOR Interest Determination Date, the Calculation Agent or its affiliate will
determine the Three Month LIBOR Rate, which will be the rate for deposits in U.S. Dollars having a
three-month maturity that appears on the Telerate Page 3750 as of approximately 11:00 a.m., London
time, on the LIBOR Interest Determination Date.

     (2) If no rate appears on Telerate Page 3750 on the LIBOR Interest Determination Date as of
approximately 11:00 a.m., London time, the Calculation Agent or its affiliate will request the
principal London offices of four major reference banks in the London Inter-Bank Market to provide
it with their offered quotations for deposits in U.S. dollars for the period of three months,
commencing on the applicable LIBOR Rate Reset Date, to prime banks in the London Inter-Bank Market
at approximately 11:00 a.m., London time, on that LIBOR Interest Determination Date and in a
principal amount that is representative for a single transaction in U.S. dollars in that market at
that time. If at least two quotations are provided, then the Three Month LIBOR Rate will be the
average (rounded, if necessary, to the nearest one hundredth (0.01) of a percent) of those
quotations. If fewer than two quotations are provided, then the Three Month LIBOR Rate will be the
average (rounded, if necessary, to the nearest one hundredth (0.01) of a percent) of the rates
quoted at approximately 11:00 a.m., New York City time, on the LIBOR Interest Determination Date by
three major banks in New York City selected by the Calculation Agent or its affiliate for loans in
U.S. Dollars to leading European banks, having a three month maturity and in a principal amount
that is representative for a single transaction in U.S. dollars in that market at that time. If
the banks selected by the Calculation Agent or its affiliate are not providing quotations in the
manner described by this paragraph, the rate for the period following the LIBOR Interest
Determination Date will be the rate in effect on that LIBOR Interest Determination Date.

     “Telerate Page 3750” means the display designated as “Telerate page 3750” on Moneyline
Telerate, Inc. (or such other page as may replace “Telerate page 3750” on such service) or such
other service displaying the offset prices, as may replace Moneyline Telerate, Inc.

     “LIBOR Interest Determination Date” means the second LIBOR Business Day preceding each LIBOR
Rate Reset Date.

     “LIBOR Business Day” means any business day on which dealings in deposits in U.S. Dollars are
transacted in the London Inter-Bank market.

     “Calculation Agent” means The Bank of New York Trust Company, N.A., or its successor appointed
by the Company, acting as calculation agent.

B-2

 

     Interest will cease to accrue on a Note upon its maturity or redemption. The Company will
calculate interest on the basis of a 360-day year composed of twelve 30-day months.

     6. The place or places where the principal of and interest on the Notes shall be payable, the
Notes may be surrendered for registration of transfer, the Notes may be surrendered for exchange
and notices may be given to the Company in respect of the Notes is at the office of the Trustee in
New York, New York and at the agency of the Trustee maintained for that purpose at the office of
the Trustee; provided that payment of interest may be made at the option of the Company by check
mailed to the address of the person entitled thereto as such address shall appear in the Security
Register (as defined in the Indenture) or by wire transfer of immediately available funds to the
accounts specified by the Holder (as defined in the Indenture) of such Notes.

     7. The Notes are redeemable, at the option of the Company, at any time after September 5, 2007
in whole or from time to time in part upon not less than 30 and not more than 60 days’ notice
mailed to each Holder of Notes at the Holder’s address appearing on the Security Register (the
“Redemption Date”) at a price equal to 100% of the principal amount thereof plus accrued and unpaid
interest up to but not including the Redemption Date (subject to the right of Holders of record on
the relevant record date to receive interest due on an interest payment date that is on or prior to
the Redemption Date).

     If less than all the Notes are to be redeemed, the Trustee will select the Notes to be
redeemed by lot, pro rata or by another method the Trustee deems fair and appropriate. The Trustee
may select for redemption Notes and portions of Notes in amounts of $1,000 or integral multiples
thereof.

     The Notes are not entitled to the benefit of any sinking fund or other mandatory redemption
provisions.

     8. Additional Amounts (as defined in the Indenture) with respect to the Notes shall be payable
in accordance with the Indenture and the provisions of this paragraph 8. The Company agrees that
any amounts to be paid by the Company hereunder with respect to any Note shall be paid without
deduction or withholding for any and all present and future withholding taxes, levies, imposts and
charges whatsoever imposed by or for the account of the Cayman Islands or any political subdivision
or taxing authority thereof or therein, or if deduction or withholding of any such taxes, levies,
imposts or charges shall at any time be required by the Cayman Islands or any such subdivision or
authority thereof or therein, the Company will (subject to compliance by the Holder of such Note
with any relevant administrative requirements) pay such additional amounts (“Tax Additional
Amounts”) in respect of principal amount, Redemption Price and interest (if any), in accordance
with the terms of the Notes and the Indenture, as specified in such Notes to which such Holder is
entitled; provided, however, that the foregoing shall not apply to:

B-3

 

     (1) any such tax, levy, impost or charge which would not be payable or due but for the fact
that (A) the Holder of a Note (or a fiduciary, settlor, beneficiary of, member or shareholder of,
such Holder, if such Holder is an estate, trust, partnership or corporation) is a domiciliary,
national or resident of, or engaging in business or maintaining a permanent establishment or being
physically present in, the Cayman Islands or such political subdivision or otherwise having some
present or former connection with the Cayman Islands other than the holding or ownership of such
Note or the collection of principal amount, Redemption Price and interest (if any), in accordance
with the terms of the Note and the Indenture, or the enforcement of such Note or (B) where
presentation is required, such Note was presented more than 30 days after the date of such payment
became due or was provided for, whichever is later;

     (2) any estate, inheritance, gift, sales, transfer, excise, personal property or similar tax,
levy, impost or charge;

     (3) any tax, levy, impost or charge which is payable otherwise than by withholding from
payment of principal amount, Redemption Price and interest (if any);

     (4) any tax, levy, impost or charge which would not have been imposed but for the failure to
comply upon the Company’s request with certification, information, documentation or other reporting
requirements concerning the nationality, residence, identity or connections with the relevant tax
authority of the Holder or beneficial owner of such Note, if such compliance is required by statute
or by regulation as a precondition to relief or exemption from such tax, levy, impost or charge; or

     (5) any combination of (1) through (4).

     nor shall any Tax Additional Amounts be paid to any Holder who is a fiduciary or partnership or
other than the sole beneficial owner of such Note to the extent that a beneficiary or settlor with
respect to such fiduciary, or a member of such partnership or a beneficial owner thereof, would not
have been entitled to the payment of such Tax Additional Amounts had such beneficiary, settlor,
member or beneficial owner been the Holder of the Note.

     9. The Notes shall be in fully registered form without coupons in denominations of $1,000 of
principal amount thereof or any integral multiple thereof.

     10. Section 403 of the Indenture shall be applicable to the Notes.

     11. The Notes will initially be issued in permanent global form, substantially in the form set
forth in Exhibit C to the Officers’ Certificate to which this Exhibit is attached (the “Global
Securities”), as a Book-Entry Security. Each Global Security shall represent such of the Notes as
shall be specified therein and shall provide that it shall represent the aggregate amount of Notes
from time to time endorsed thereon and that the aggregate amount of Notes represented thereby may
from time to time be reduced to reflect exchanges and redemptions. Any endorsement of a Note to
reflect that amount, or any increase or decrease in the amount, of Notes represented thereby shall
be made by the

B-4

 

Trustee in accordance with written instructions or such other written form of instructions as
is customary for the Depositary, from the Depositary or its nominee on behalf of any Person having
the beneficial interest in the Global Security.

     12. The Company initially appoints the Trustee to act as Paying Agent with respect to the
Notes.

B-5exv10w11

 

Exhibit
10.11

Execution Version

AMENDED AND RESTATED CREDIT AGREEMENT

Dated as of August 30, 2006

Among

CALLON PETROLEUM COMPANY

as Borrower,

UNION BANK OF CALIFORNIA, N.A.,

as Lead Arranger and Administrative Agent,

GUARANTY BANK, as Syndication Agent

NATEXIS BANQUES POPULAIRES, as Documentation Agent,

and

THE LENDERS SIGNATORY HERETO

$175,000,000 Senior Secured Credit Facility

 

 

TABLE OF CONTENTS

	 	 	 	 	 	 	 	 	 
	 	 	 	 	 	 	Page
	ARTICLE I DEFINITIONS AND ACCOUNTING MATTERS	 	 	1	 
	 

	 	Section 1.01
	 	Terms Defined Above
	 	 	1	 
	 

	 	Section 1.02
	 	Certain Defined Terms
	 	 	1	 
	 

	 	Section 1.03
	 	Accounting Terms and Determinations
	 	 	17	 
	ARTICLE II COMMITMENTS	 	 	17	 
	 

	 	Section 2.01
	 	Loans and Letters of Credit
	 	 	17	 
	 

	 	Section 2.02
	 	Borrowings, Continuations and Conversions, Letters of Credit
	 	 	18	 
	 

	 	Section 2.03
	 	Changes of Commitments
	 	 	20	 
	 

	 	Section 2.04
	 	Fees
	 	 	20	 
	 

	 	Section 2.05
	 	Several Obligations
	 	 	21	 
	 

	 	Section 2.06
	 	Notes
	 	 	21	 
	 

	 	Section 2.07
	 	Prepayments
	 	 	22	 
	 

	 	Section 2.08
	 	Borrowing Base
	 	 	23	 
	 

	 	Section 2.09
	 	Assumption of Risks
	 	 	24	 
	 

	 	Section 2.10
	 	Obligation to Reimburse and to Prepay
	 	 	25	 
	 

	 	Section 2.11
	 	Lending Offices
	 	 	27	 
	ARTICLE III PAYMENTS OF PRINCIPAL AND INTEREST	 	 	27	 
	 

	 	Section 3.01
	 	Repayment of Principal
	 	 	27	 
	 

	 	Section 3.02
	 	Payment of Interest
	 	 	27	 
	 

	 	Section 3.03
	 	Payment Waterfall
	 	 	28	 
	ARTICLE IV PAYMENTS; PRO RATA TREATMENT; COMPUTATIONS; ETC	 	 	29	 
	 

	 	Section 4.01
	 	Payments
	 	 	29	 
	 

	 	Section 4.02
	 	Pro Rata Treatment
	 	 	30	 
	 

	 	Section 4.03
	 	Computations
	 	 	30	 
	 

	 	Section 4.04
	 	Non-receipt of Funds by the Administrative Agent
	 	 	30	 
	 

	 	Section 4.05
	 	Set-off, Sharing of Payments, Etc
	 	 	31	 
	 

	 	Section 4.06
	 	Taxes
	 	 	32	 
	 

	 	Section 4.07
	 	Disposition of Proceeds
	 	 	34	 
	ARTICLE V CAPITAL ADEQUACY AND YIELD PROTECTION	 	 	35	 
	 

	 	Section 5.01
	 	Additional Costs
	 	 	35	 

-i-

 

TABLE OF CONTENTS

(continued)

	 	 	 	 	 	 	 	 	 
	 	 	 	 	 	 	Page
	 

	 	Section 5.02
	 	Limitation on LIBOR Loans
	 	 	36	 
	 

	 	Section 5.03
	 	Illegality
	 	 	37	 
	 

	 	Section 5.04
	 	Base Rate Loans Pursuant to Sections 5.01, 5.02 and 5.03
	 	 	37	 
	 

	 	Section 5.05
	 	Compensation
	 	 	37	 
	 

	 	Section 5.06
	 	Time Limit; Etc
	 	 	38	 
	 

	 	Section 5.07
	 	Replacement Lenders
	 	 	38	 
	ARTICLE VI CONDITIONS PRECEDENT	 	 	39	 
	 

	 	Section 6.01
	 	Initial Funding
	 	 	39	 
	 

	 	Section 6.02
	 	Initial and Subsequent Loans and Letters of Credit
	 	 	41	 
	 

	 	Section 6.03
	 	Conditions Precedent for the Benefit of Lenders
	 	 	41	 
	 

	 	Section 6.04
	 	No Waiver
	 	 	42	 
	ARTICLE VII REPRESENTATIONS AND WARRANTIES	 	 	42	 
	 

	 	Section 7.01
	 	Corporate Existence
	 	 	42	 
	 

	 	Section 7.02
	 	Financial Condition
	 	 	42	 
	 

	 	Section 7.03
	 	Litigation
	 	 	42	 
	 

	 	Section 7.04
	 	No Breach
	 	 	43	 
	 

	 	Section 7.05
	 	Authority
	 	 	43	 
	 

	 	Section 7.06
	 	Approvals
	 	 	43	 
	 

	 	Section 7.07
	 	Use of Loans
	 	 	43	 
	 

	 	Section 7.08
	 	ERISA
	 	 	43	 
	 

	 	Section 7.09
	 	Taxes
	 	 	44	 
	 

	 	Section 7.10
	 	Titles, Etc
	 	 	45	 
	 

	 	Section 7.11
	 	No Material Misstatements
	 	 	45	 
	 

	 	Section 7.12
	 	Investment Company Act
	 	 	46	 
	 

	 	Section 7.13
	 	[Reserved]
	 	 	46	 
	 

	 	Section 7.14
	 	Subsidiaries
	 	 	46	 
	 

	 	Section 7.15
	 	Location of Business, Offices and Inventory
	 	 	46	 
	 

	 	Section 7.16
	 	Defaults
	 	 	46	 
	 

	 	Section 7.17
	 	Environmental Matters
	 	 	46	 
	 

	 	Section 7.18
	 	Compliance with the Law
	 	 	47	 

-ii-

 

TABLE OF CONTENTS

(continued)

	 	 	 	 	 	 	 	 	 
	 	 	 	 	 	 	Page
	 

	 	Section 7.19
	 	Insurance
	 	 	48	 
	 

	 	Section 7.20
	 	Hedging Agreements
	 	 	48	 
	 

	 	Section 7.21
	 	Restriction on Liens
	 	 	48	 
	 

	 	Section 7.22
	 	Material Agreements
	 	 	48	 
	ARTICLE VIII AFFIRMATIVE COVENANTS	 	 	49	 
	 

	 	Section 8.01
	 	Reporting Requirements
	 	 	49	 
	 

	 	Section 8.02
	 	Litigation
	 	 	51	 
	 

	 	Section 8.03
	 	Maintenance, Etc
	 	 	51	 
	 

	 	Section 8.04
	 	Environmental Matters
	 	 	53	 
	 

	 	Section 8.05
	 	Further Assurances
	 	 	54	 
	 

	 	Section 8.06
	 	Performance of Obligations
	 	 	54	 
	 

	 	Section 8.07
	 	Engineering Reports
	 	 	54	 
	 

	 	Section 8.08
	 	Title Information
	 	 	55	 
	 

	 	Section 8.09
	 	Collateral
	 	 	56	 
	 

	 	Section 8.10
	 	ERISA Information and Compliance
	 	 	57	 
	 

	 	Section 8.11
	 	Inspection; Books and Records
	 	 	57	 
	ARTICLE IX NEGATIVE COVENANTS	 	 	58	 
	 

	 	Section 9.01
	 	Debt
	 	 	58	 
	 

	 	Section 9.02
	 	Liens
	 	 	59	 
	 

	 	Section 9.03
	 	Investments, Loans and Advances
	 	 	60	 
	 

	 	Section 9.04
	 	Dividends, Distributions and Redemptions
	 	 	61	 
	 

	 	Section 9.05
	 	Sales and Leasebacks
	 	 	61	 
	 

	 	Section 9.06
	 	Nature of Business
	 	 	61	 
	 

	 	Section 9.07
	 	[Intentionally omitted]
	 	 	61	 
	 

	 	Section 9.08
	 	Mergers, Etc
	 	 	61	 
	 

	 	Section 9.09
	 	Proceeds of Notes; Letters of Credit
	 	 	61	 
	 

	 	Section 9.10
	 	ERISA Compliance
	 	 	62	 
	 

	 	Section 9.11
	 	[Intentionally omitted]
	 	 	63	 
	 

	 	Section 9.12
	 	Current Ratio
	 	 	63	 
	 

	 	Section 9.13
	 	Fixed Charge Coverage Ratio
	 	 	63	 

-iii-

 

TABLE OF CONTENTS

(continued)

	 	 	 	 	 	 	 	 	 
	 	 	 	 	 	 	Page
	 

	 	Section 9.14
	 	Leverage Ratio
	 	 	63	 
	 

	 	Section 9.15
	 	Sale of Oil and Gas Properties
	 	 	64	 
	 

	 	Section 9.16
	 	Environmental Matters
	 	 	64	 
	 

	 	Section 9.17
	 	Transactions with Affiliates
	 	 	64	 
	 

	 	Section 9.18
	 	Subsidiaries
	 	 	64	 
	 

	 	Section 9.19
	 	Negative Pledge Agreements
	 	 	64	 
	 

	 	Section 9.20
	 	[Reserved]
	 	 	64	 
	 

	 	Section 9.21
	 	Subordinated Debt
	 	 	65	 
	 

	 	Section 9.22
	 	Hanover Agreements
	 	 	65	 
	 

	 	Section 9.23
	 	Permitted Medusa Transactions; Permitted Entrada Transactions
	 	 	65	 
	ARTICLE X EVENTS OF DEFAULT; REMEDIES	 	 	65	 
	 

	 	Section 10.01
	 	Events of Default
	 	 	65	 
	 

	 	Section 10.02
	 	Remedies
	 	 	67	 
	ARTICLE XI THE ADMINISTRATIVE AGENT	 	 	68	 
	 

	 	Section 11.01
	 	Appointment, Powers and Immunities
	 	 	68	 
	 

	 	Section 11.02
	 	Reliance by Administrative Agent
	 	 	68	 
	 

	 	Section 11.03
	 	Defaults
	 	 	69	 
	 

	 	Section 11.04
	 	Rights as a Lender
	 	 	69	 
	 

	 	Section 11.05
	 	Indemnification
	 	 	69	 
	 

	 	Section 11.06
	 	Non-Reliance on Administrative Agent and other Lenders
	 	 	69	 
	 

	 	Section 11.07
	 	Action by Administrative Agent
	 	 	70	 
	 

	 	Section 11.08
	 	Resignation or Removal of Administrative Agent
	 	 	70	 
	 

	 	Section 11.09
	 	Agents
	 	 	71	 
	ARTICLE XII MISCELLANEOUS	 	 	71	 
	 

	 	Section 12.01
	 	Waiver
	 	 	71	 
	 

	 	Section 12.02
	 	Notices
	 	 	71	 
	 

	 	Section 12.03
	 	Payment of Expenses, Indemnities, etc
	 	 	71	 
	 

	 	Section 12.04
	 	Amendments, Etc
	 	 	74	 
	 

	 	Section 12.05
	 	Successors and Assigns
	 	 	74	 

-iv-

 

TABLE OF CONTENTS

(continued)

	 	 	 	 	 	 	 	 	 
	 	 	 	 	 	 	Page
	 

	 	Section 12.06
	 	Assignments and Participations
	 	 	74	 
	 

	 	Section 12.07
	 	Invalidity
	 	 	76	 
	 

	 	Section 12.08
	 	Counterparts
	 	 	76	 
	 

	 	Section 12.09
	 	References; Use of Word “Including”
	 	 	76	 
	 

	 	Section 12.10
	 	Survival
	 	 	76	 
	 

	 	Section 12.11
	 	Captions
	 	 	76	 
	 

	 	Section 12.12
	 	No Oral Agreements
	 	 	77	 
	 

	 	Section 12.13
	 	Governing Law; Submission to Jurisdiction
	 	 	77	 
	 

	 	Section 12.14
	 	Interest
	 	 	78	 
	 

	 	Section 12.15
	 	Confidentiality
	 	 	79	 
	 

	 	Section 12.16
	 	Exculpation Provisions
	 	 	79	 
	 

	 	Section 12.17
	 	Hedging Agreement Substitution of Collateral
	 	 	80	 
	 

	 	Section 12.18
	 	Amendment, Restatement and Rearrangement of Prior Debt
	 	 	80	 
	 

	 	Section 12.19
	 	Obligations as Senior Indebtedness; Specified Senior Indebtedness
	 	 	80	 

-v-

 

ANNEXES, EXHIBITS AND SCHEDULES

	 	 	 
	Annex I

	 	- List of Percentage Shares and Maximum Credit Amounts
	Exhibit A

	 	- Form of Note
	Exhibit B

	 	- Form of Borrowing, Continuation and Conversion Request
	Exhibit C

	 	- Form of Compliance Certificate
	Exhibit D

	 	- List of Security Instruments
	Exhibit E

	 	- Form of Assignment Agreement
	Schedule 7.02

	 	- Liabilities
	Schedule 7.03

	 	- Litigation
	Schedule 7.09

	 	- Taxes
	Schedule 7.10

	 	- Titles, etc.
	Schedule 7.14

	 	- Subsidiaries and Partnerships
	Schedule 7.17

	 	- Environmental Matters
	Schedule 7.19

	 	- Insurance
	Schedule 7.20

	 	- Hedging Agreements
	Schedule 7.22

	 	- Material Agreements
	Schedule 7.23

	 	- Gas Imbalances
	Schedule 9.01

	 	- Debt
	Schedule 9.02

	 	- Liens
	Schedule 9.03

	 	- Investments, Loans and Advances

-vi-

 

     THIS AMENDED AND RESTATED CREDIT AGREEMENT dated as of August 30, 2006 is among CALLON
PETROLEUM COMPANY, a corporation formed under the laws of the State of Delaware (the
“Borrower”); each of the lenders that is a signatory hereto or which becomes a signatory
hereto as provided in Section 12.06 (individually, together with its successors and assigns, a
“Lender” and, collectively, the “Lenders”); GUARANTY BANK, as Syndication Agent,
NATEXIS BANQUES POPULAIRES, as Documentation Agent, and UNION BANK OF CALIFORNIA, N.A., (in its
individual capacity, “UBOC”), as administrative agent for the Lenders (in such capacity,
together with its successors in such capacity, the “Administrative Agent”) and as
documentation agent.

RECITALS

     A. The Borrower has previously requested that the Lenders provide certain loans to and
extensions of credit on behalf of the Borrower;

     B. Pursuant to such request, the Lenders agreed to make such loans and extensions of credit
subject to the terms and conditions of the Prior Credit Agreement; and

     C. The Borrower has now requested (and the Lenders have agreed) that the Prior Credit
Agreement be amended and restated in its entirety in accordance with the terms and provisions of
this Agreement.

     D. In consideration of the mutual covenants and agreements herein contained and of the loans,
extensions of credit and commitments hereinafter referred to, the parties hereto agree that the
Prior Credit Agreement is hereby amended and restated in its entirety to read as follows:

ARTICLE I

Definitions and Accounting Matters

     Section 1.01 Terms Defined Above. As used in this Agreement, the terms
“Administrative Agent,” “Borrower,” “Lender,” “Lenders” and
“UBOC” shall have the meanings indicated above.

     Section 1.02 Certain Defined Terms. As used herein, the following terms shall have
the following meanings (all terms defined in this Article I or in other provisions of this
Agreement in the singular to have equivalent meanings when used in the plural and vice versa):

     “2010 Senior Notes” shall mean the 9.75% Senior Notes due December 5, 2010, issued by
Borrower under that certain indenture dated March 15, 2004, between Borrower and American Stock
Transfer & Trust Company, as trustee, as modified, renewed, or supplemented from time to time to
the extent permitted under Sections 9.01 and 9.23 of this Agreement.

     “Additional Costs” shall have the meaning assigned such term in Section 5.01(a).

     “Affected Loans” shall have the meaning assigned such term in Section 5.04.

 

 

     “Affiliate” of any Person shall mean (i) any Person directly or indirectly controlled
by, controlling or under common control with such first Person, (ii) any director or officer of
such first Person or of any Person referred to in clause (i) above and (iii) if any Person in
clause (i) above is an individual, any member of the immediate family (including parents, spouse
and children) of such individual and any trust whose principal beneficiary is such individual or
one or more members of such immediate family and any Person who is controlled by any such member or
trust. For purposes of this definition, any Person which owns directly or indirectly 20% or more
of the securities having ordinary voting power for the election of directors or other governing
body of a corporation or 10% or more of the partnership or other ownership interests of any other
Person (other than as a limited partner of such other Person) will be deemed to “control”
(including, with its correlative meanings, “controlled by” and “under common control
with”) such corporation or other Person.

     “Agreement” shall mean this Credit Agreement, as the same may from time to time be
amended or supplemented.

     “Aggregate Commitments” at any time shall equal the amount calculated in accordance
with Section 2.03.

     “Aggregate Maximum Credit Amount” at any time shall equal the sum of the Maximum
Credit Amounts of the Lenders, as the same may be reduced pursuant to Section 2.03(b). The
Aggregate Maximum Credit Amount on the Closing Date shall be $175,000,000.

     “Applicable Lending Office” shall mean, for each Lender and for each Type of Loan, the
lending office of such Lender (or an Affiliate of such Lender) designated for such Type of Loan on
the signature pages hereof or such other offices of such Lender (or of an Affiliate of such Lender)
as such Lender may from time to time specify to the Administrative Agent and the Borrower as the
office by which its Loans of such Type are to be made and maintained.

     “Applicable Margin” shall mean the applicable per annum percentage set forth at the
appropriate intersection in the table shown below, based on the Borrowing Base Utilization as in
effect from time to time:

	 	 	 	 	 	 	 	 	 
	 	 	Applicable Margin
	Borrowing Base Utilization	 	LIBOR Loans	 	Base Rate Loans
	Less than 50%
	 	 	1.375	%	 	 	0.00	%
	Greater than or equal to 50%,
but less than 75%
	 	 	1.625	%	 	 	0.00	%
	Greater than or equal to 75%, but less
than 90%
	 	 	1.750	%	 	 	0.25	%
	Greater than or equal to 90%
	 	 	2.000	%	 	 	0.50	%

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Each change in the Applicable Margin resulting from a change in the Borrowing Base Utilization
shall take effect on the day such change in the Borrowing Base Utilization occurs.

     “Assignment” shall have the meaning assigned such term in Section 12.06(b).

     “Base Rate” shall mean, with respect to any Base Rate Loan, for any day, the higher of
(i) the Federal Funds Rate for any such day plus 1/2 of 1% or (ii) the Prime Rate for such day.
Each change in any interest rate provided for herein based upon the Base Rate resulting from a
change in the Base Rate shall take effect at the time of such change in the Base Rate.

     “Base Rate Loans” shall mean Loans that bear interest at rates based upon the Base
Rate.

     “Beneficiaries” shall mean the Administrative Agent, the Lenders, each Issuing Bank
and each Affiliate of a Lender that is a party to a Hedging Agreement with the Borrower or any
Guarantor.

     “Borrowing Base” shall mean at any time an amount equal to the amount determined in
accordance with Section 2.08.

     “Borrowing Base Deficiency” shall occur and be continuing at any time that, and relate
to the amount by which, the sum of the aggregate outstanding principal amount of the Loans, plus
the LC Exposure, exceeds the Borrowing Base.

     “Borrowing Base Properties” means those Oil and Gas Properties of Borrower and the
Guarantors elected by the Borrower to be evaluated for Borrowing Base purposes and included in the
most recent Reserve Report delivered to the Lenders under this Agreement.

     “Business Day” shall mean any day other than a day on which commercial banks are
authorized or required to close in Houston, Texas or Los Angeles, California and, where such term
is used in the definition of “Quarterly Date” or if such day relates to a borrowing or continuation
of, a payment or prepayment of principal of or interest on, or a conversion of or into, or the
Interest Period for, a LIBOR Loan or a notice by the Borrower with respect to any such borrowing or
continuation, payment, prepayment, conversion or Interest Period, any day which is also a day on
which dealings in Dollar deposits are carried out in the London interbank market.

     “Change of Control” means the occurrence of any of the following events: (i) any
Person or two or more Persons, other than the Borrower or any Affiliate of the Borrower, acting as
a group shall acquire beneficial ownership (within the meaning of Rule 13d-3 of the Securities and
Exchange Commission under the Exchange Act, and including holding proxies to vote for the election
of directors other than proxies held by the Borrower’s management or their designees to be voted in
favor of persons nominated by the Borrower’s Board of Directors) of 40% or more of the outstanding
voting securities of the Borrower, measured by voting power (including both ordinary shares and any
preferred stock or other equity securities entitling the holders thereof to vote with the holders
of common stock in elections for directors of the Borrower), (ii) the Borrower shall fail
beneficially to own, directly or indirectly, 100% of the outstanding shares of voting capital stock
of any of the Guarantors on a fully-diluted basis, or (iii) 50% or more of the directors of the
Borrower shall consist of Persons not nominated by the Borrower’s Board of

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Directors (not including as Board nominees any directors which the Board is obligated to
nominate pursuant to shareholders agreements, voting trust arrangements or similar arrangements).

     “Closing Date” shall mean the date on which all conditions precedent described in
Section 6.01 have been satisfied or waived.

     “Code” shall mean the Internal Revenue Code of 1986, as amended from time to time and
any successor statute.

     “Collateral” shall mean the Property owned by the Borrower and the Guarantors which is
subject to the Liens existing and to exist under the terms of the Security Instruments.

     “Commitment” shall mean, for any Lender, its obligation to make Loans as provided in
Section 2.01(a) and to participate in the Letters of Credit as provided in Section 2.01(b) up to
the lesser of (i) such Lender’s Maximum Credit Amount and (ii) the Lender’s Percentage Share of the
amount equal to the then effective Borrowing Base.

     “Consolidated Net Income” shall mean with respect to the Borrower and its Consolidated
Subsidiaries, for any period, the aggregate of the net income (or loss) of the Borrower and its
Consolidated Subsidiaries after allowances for taxes for such period, determined on a consolidated
basis in accordance with GAAP; provided that there shall be excluded from such net income
(to the extent otherwise included therein) the following: (i) the net income of any Person in which
the Borrower or any Consolidated Subsidiary has an interest (which interest does not cause the net
income of such other Person to be consolidated with the net income of the Borrower and its
Consolidated Subsidiaries in accordance with GAAP), except to the extent of the amount of dividends
or distributions actually paid in such period by such other Person to the Borrower or to a
Consolidated Subsidiary, as the case may be; (ii) the net income (but not loss) of any Consolidated
Subsidiary to the extent that the declaration or payment of dividends or similar distributions or
transfers or loans by that Consolidated Subsidiary is not at the time permitted by operation of the
terms of its charter or any agreement, instrument or Governmental Requirement applicable to such
Consolidated Subsidiary, or is otherwise restricted or prohibited in each case determined in
accordance with GAAP; (iii) the net income (or loss) of any Person acquired in a pooling of
interests transaction for any period prior to the date of such transaction; (iv) any extraordinary
gains or losses, including gains or losses attributable to Property sales not in the ordinary
course of business; and (v) the cumulative effect of a change in accounting principles and any
gains or losses attributable to writeups or write downs of assets.

     “Consolidated Subsidiaries” shall mean each Subsidiary of a Person (whether now
existing or hereafter created or acquired) the financial statements of which shall be (or should
have been) consolidated with the financial statements of such Person in accordance with GAAP.
Unless otherwise indicated, each reference to the term “Consolidated Subsidiary” shall mean a
Subsidiary consolidated with the Borrower.

     “CPOC” means Callon Petroleum Operating Company, a Delaware corporation.

     “Debt” shall mean, for any Person the sum of the following (without duplication): (i)
all obligations of such Person for borrowed money or evidenced by bonds, debentures, notes or

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other similar instruments (including principal, interest, fees and charges); (ii) all
obligations of such Person (whether contingent or otherwise) in respect of bankers’ acceptances,
letters of credit, surety or other bonds and similar instruments; (iii) all obligations of such
Person to pay the deferred purchase price of Property or services (other than for borrowed money);
(iv) all obligations under leases which shall have been, or should have been, in accordance with
GAAP, recorded as capital leases in respect of which such Person is liable (whether contingent or
otherwise); (v) all obligations of such Person under leases treated as operating leases under GAAP
and as a loan or financing for U.S. income tax purposes; (vi) all Debt (as described in the other
clauses of this definition) and other obligations of others secured by a Lien on any asset of such
Person, whether or not such Debt is assumed by such Person; (vii) all Debt (as described in the
other clauses of this definition) and other obligations of others guaranteed by such Person or in
which such Person otherwise assures a creditor against loss of the debtor or obligations of others;
(viii) all obligations or undertakings of such Person to maintain or cause to be maintained the
financial position or covenants of others or to purchase the Debt or Property of others; (ix)
obligations to deliver goods or services including Hydrocarbons in consideration of advance
payments, except as permitted by Section 9.20 and disclosed by Section 8.07(c); (x) obligations to
pay for goods or services whether or not such goods or services are actually received or utilized
by such Person; (xi) any capital stock of such Person in which such Person has a mandatory
obligation to redeem such stock, but excluding, in the case of the Borrower, mandatory obligations
to redeem such stock after September 15, 2004; (xii) any Debt of a Special Entity for which such
Person is liable either by agreement or because of a Governmental Requirement; (xiii) the
undischarged balance of any production payment created by such Person or for the creation of which
such Person directly or indirectly received payment; and (xiv) all obligations of such Person under
Hedging Agreements.

     “Default” shall mean an Event of Default or an event which with notice or lapse of
time or both would become an Event of Default.

     “Deficiency Payment” shall mean, in respect of any Borrowing Base Deficiency, any
payments made by the Borrower during a Deficiency Period for such Borrowing Base Deficiency equal
to either (i) in the case of each such payment the amount of the Borrowing Base Deficiency on the
first day of such Deficiency Period divided by six (6) or (ii) such other amount as the Majority
Lenders may approve, which when aggregated with the other such payments for such Deficiency Period,
are sufficient to reduce the Borrowing Base Deficiency to zero on or before the final day of such
Deficiency Period.

     “Deficiency Period” shall mean any period of time commencing on the date that the
Administrative Agent notifies the Borrower of the existence of a Borrowing Base Deficiency and
ending on the date which is six (6) months thereafter.

     “Documentation Agent” shall mean Natexis Banques Populaires.

     “Dollars” and “$” shall mean lawful money of the United States of America.

     “EBITDA” shall mean, for any period, the sum of Consolidated Net Income for such
period plus the following expenses or charges to the extent deducted from Consolidated Net

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Income in such period: interest, taxes, depreciation, depletion and amortization and any other
non cash charges or expenses.

     “Engineering Reports” shall have the meaning assigned such term in Section 2.08.

     “Entrada Assets” shall have the meaning assigned to such term in Section 8.09(a).

     “Entrada Entity” shall have the meaning assigned to such term in Section 8.09(a).

     “Entrada Field” means any and all Oil and Gas Properties on, under or related to
Garden Banks Blocks 738, 782, 826 and 827 located in the federal offshore waters of the Gulf of
Mexico.

     “Environmental Laws” shall mean any and all Governmental Requirements pertaining to
health or the environment in effect in any and all jurisdictions in which the Borrower or any
Subsidiary is conducting or at any time has conducted business, or where any Property of the
Borrower or any Subsidiary is located, including without limitation, the Oil Pollution Act of 1990
(“OPA”), the Clean Air Act, as amended, the Comprehensive Environmental, Response,
Compensation, and Liability Act of 1980 (“CERCLA”), as amended, the Federal Water Pollution
Control Act, as amended, the Occupational Safety and Health Act of 1970, as amended, the Resource
Conservation and Recovery Act of 1976 (“RCRA”), as amended, the Safe Drinking Water Act, as
amended, the Toxic Substances Control Act, as amended, the Superfund Amendments and Reauthorization
Act of 1986, as amended, the Hazardous Materials Transportation Act, as amended, and other
environmental conservation or protection laws. The term “oil” shall have the meaning specified in
OPA, the terms “hazardous substance” and “release” (or “threatened release”) have the meanings
specified in CERCLA, and the terms “solid waste” and “disposal” (or “disposed”) have the meanings
specified in RCRA; provided, however, that (i) in the event either OPA, CERCLA or
RCRA is amended so as to broaden the meaning of any term defined thereby, such broader meaning
shall apply subsequent to the effective date of such amendment and (ii) to the extent the laws of
the state in which any Property of the Borrower or any Subsidiary is located establish a meaning
for “oil,” “hazardous substance,” “release,” “solid waste” or “disposal” which is broader than that
specified in either OPA, CERCLA or RCRA, such broader meaning shall apply.

     “ERISA” shall mean the Employee Retirement Income Security Act of 1974, as amended
from time to time and any successor statute.

     “ERISA Affiliate” shall mean each trade or business (whether or not incorporated)
which together with the Borrower or any Subsidiary would be deemed to be a “single employer” within
the meaning of section 4001(b)(1) of ERISA or subsections (b), (c), (m) or (o) of section 414 of
the Code.

     “ERISA Event” shall mean (i) a “Reportable Event” described in Section 4043 of ERISA
and the regulations issued thereunder, (ii) the withdrawal of the Borrower, any Subsidiary or any
ERISA Affiliate from a Plan during a plan year in which it was a “substantial employer” as defined
in Section 4001(a)(2) of ERISA, (iii) the filing of a notice of intent to terminate a Plan or the
treatment of a Plan amendment as a termination under Section 4041 of ERISA, (iv) the institution of
proceedings to terminate a Plan by the PBGC or (v) any other event or condition

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which might constitute grounds under Section 4042 of ERISA for the termination of, or the
appointment of a trustee to administer, any Plan.

     “Event of Default” shall have the meaning assigned such term in Section 10.01.

     “Excepted Liens” shall mean: (i) Liens for taxes, assessments or other governmental
charges or levies not yet due or which are being contested in good faith by appropriate action and
for which adequate reserves have been maintained; (ii) Liens in connection with workmen’s
compensation, unemployment insurance or other social security, old age pension or public liability
obligations not yet due or which are being contested in good faith by appropriate action and for
which adequate reserves have been maintained in accordance with GAAP; (iii) operators’, vendors’,
carriers’, warehousemen’s, repairmen’s, mechanics’, workmen’s, materialmen’s, construction or other
like Liens arising by operation of law in the ordinary course of business or incident to the
exploration, development, operation and maintenance of Oil and Gas Properties or landlord’s liens,
each of which is in respect of obligations that have not been outstanding more than 90 days or
which are being contested in good faith by appropriate proceedings and for which adequate reserves
have been maintained in accordance with GAAP; (iv) any Liens reserved in leases or farmout
agreements for rent or royalties and for compliance with the terms of the farmout agreements or
leases in the case of leasehold estates, to the extent that any such Lien referred to in this
clause does not materially impair the use of the Property covered by such Lien for the purposes for
which such Property is held by the Borrower or any Subsidiary or materially impair the value of
such Property subject thereto; (v) encumbrances (other than to secure the payment of borrowed money
or the deferred purchase price of Property or services), easements, restrictions, servitudes,
permits, conditions, covenants, exceptions or reservations in any rights of way or other Property
of the Borrower or any Subsidiary for the purpose of roads, pipelines, transmission lines,
transportation lines, distribution lines for the removal of gas, oil, coal or other minerals or
timber, and other like purposes, or for the joint or common use of real estate, rights of way,
facilities and equipment, and defects, irregularities, zoning restrictions and deficiencies in
title of any rights of way or other Property which in the aggregate do not materially impair the
use of such rights of way or other Property for the purposes of which such rights of way and other
Property are held by the Borrower or any Subsidiary or materially impair the value of such Property
subject thereto; (vi) deposits of cash or securities to secure the performance of bids, trade
contracts, leases, statutory obligations and other obligations of a like nature incurred in the
ordinary course of business; and (vii) Liens permitted by the Security Instruments.

     “Existing Letters of Credit” means the letters of credit issued by the Issuing Banks
under the Prior Credit Agreement and which have not been terminated or expired and returned to the
respective Issuing Bank as of the Closing Date.

     “Existing Other Debt” shall mean the 2010 Senior Notes.

     “Federal Funds Rate” shall mean, for any day, the rate per annum (rounded upwards, if
necessary, to the nearest 1/100 of 1%) equal to the weighted average of the rates on overnight
federal funds transactions with a member of the Federal Reserve System arranged by federal funds
brokers on such day, as published by the Federal Reserve Bank of New York on the Business Day next
succeeding such day, provided that (i) if the date for which such rate is to be

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determined is not a Business Day, the Federal Funds Rate for such day shall be such rate on
such transactions on the next preceding Business Day as so published on the next succeeding
Business Day, and (ii) if such rate is not so published for any day, the Federal Funds Rate for
such day shall be the average rate charged to the Administrative Agent on such day on such
transactions as determined by the Administrative Agent.

     “Fee Letter” shall mean that certain letter agreement from UBOC to the Borrower dated
as of August 30, 2006 concerning certain fees in connection with this Agreement and any agreements
or instruments executed in connection therewith, as the same may be amended or replaced from time
to time.

     “Financial Statements” shall mean the financial statement or statements of the
Borrower and its Consolidated Subsidiaries described or referred to in Section 7.02.

     “Funded Debt” shall mean, for any Person the sum (without duplication) of all Debt of
the type described in clauses (i), (iv) and (v) of the definition thereof.

     “GAAP” shall mean generally accepted accounting principles in the United States of
America in effect from time to time.

     “Governmental Authority” shall include the country, the state, county, city and
political subdivisions in which any Person or such Person’s Property is located or which exercises
valid jurisdiction over any such Person or such Person’s Property, and any court, agency,
department, commission, board, bureau or instrumentality of any of them including monetary
authorities which exercises valid jurisdiction over any such Person or such Person’s Property.
Unless otherwise specified, all references to Governmental Authority herein shall mean a
Governmental Authority having jurisdiction over, where applicable, the Borrower, its Subsidiaries
or any of their Property or the Administrative Agent, any Lender, any Affiliate of Lender or any
Applicable Lending Office.

     “Governmental Requirement” shall mean any law, statute, code, ordinance, order,
determination, rule, regulation, judgment, decree, injunction, franchise, permit, certificate,
license, authorization or other directive or requirement (whether or not having the force of law),
including, without limitation, Environmental Laws, energy regulations and occupational, safety and
health standards or controls, of any Governmental Authority.

     “Guarantors” shall mean CPOC, Callon Offshore Production, Inc., a Mississippi
corporation, Mississippi Marketing, Inc., a Mississippi corporation, and Callon Mineral Properties,
Inc., each a “Guarantor”.

     “Guaranty Agreement” shall mean an agreement executed by each Guarantor in form and
substance satisfactory to the Administrative Agent guarantying, unconditionally, payment of the
Obligations, as the same may be amended, modified or supplemented from time to time.

     “Hanover Processing Agreement” shall mean that certain Processing Agreement dated as
of December 14, 2001 by and between CPOC and Hanover Compression Limited Partnership and an
accurate copy of which has been previously provided to the Lenders.

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     “Hanover Sales Documents” shall mean that certain Bill of Sale dated as of December
14, 2001 and that certain Engineering, Procurement, Construction and Installation (EPCI) Contract
dated as of December 14, 2001 each by and between CPOC and Hanover Compression Limited Partnership
and accurate copies of which have been previously provided to the Lenders.

     “Hedging Agreements” shall mean any commodity, interest rate or currency swap, cap,
floor, collar, forward agreement (for a term in excess of thirty days) or other exchange or
protection agreements or any option with respect to any such transaction.

     “Highest Lawful Rate” shall mean, with respect to each Lender, the maximum nonusurious
interest rate, if any, that at any time or from time to time may be contracted for, taken,
reserved, charged or received on the Notes or on other Obligations 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 or
hereafter acquired in and to oil and gas leases, oil, gas and mineral leases, or other liquid or
gaseous hydrocarbon leases, mineral fee interests, overriding royalty and royalty interests, net
profit interests and production payment interests, including any reserved or residual interests of
whatever nature.

     “Hydrocarbons” shall mean oil, gas, casinghead gas, drip gasoline, natural gasoline,
condensate, distillate, liquid hydrocarbons, gaseous hydrocarbons and all products refined or
separated therefrom.

     “Indemnified Parties” shall have the meaning assigned such term in Section
12.03(a)(ii).

     “Indemnity Matters” shall mean any and all actions, suits, proceedings (including any
investigations, litigation or inquiries), claims, demands and causes of action made or threatened
against a Person and, in connection therewith, all losses, liabilities, damages (including, without
limitation, consequential damages) or reasonable costs and expenses of any kind or nature
whatsoever incurred by such Person whether caused by the sole or concurrent negligence of such
Person seeking indemnification.

     “Initial Funding” shall mean the funding of the initial Loans or issuance of the
initial Letters of Credit upon satisfaction of the conditions set forth in Sections 6.01 and 6.02.

     “Initial Reserve Report” shall mean the report of the Borrower, dated effective as of
June 1, 2006, with respect to the Oil and Gas Properties of the Borrower as of December 31, 2005, a
copy of which has been delivered to the Administrative Agent.

     “Interest Period” shall mean, with respect to any LIBOR Loan, the period commencing on
the date such LIBOR Loan is made and ending on the numerically corresponding day in the first,
second, third or sixth calendar month thereafter, as the Borrower may select as provided in Section
2.02 (or such other period as may be requested by the Borrower and agreed to by the Majority
Lenders), except that each Interest Period which commences on the last Business Day of a calendar
month (or on any day for which there is no numerically corresponding day in the

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appropriate subsequent calendar month) shall end on the last Business Day of the appropriate
subsequent calendar month.

     Notwithstanding the foregoing: (i) no Interest Period may end after the Revolving Credit
Termination Date; (ii) each Interest Period which would otherwise end on a day which is not a
Business Day shall end on the next succeeding Business Day (or, if such next succeeding Business
Day falls in the next succeeding calendar month, on the next preceding Business Day); and (iii) no
Interest Period shall have a duration of less than one month and, if the Interest Period for any
LIBOR Loans would otherwise be for a shorter period, such Loans shall not be available hereunder.

     “Issuing Bank” shall mean UBOC or any other Lender agreed to among the Borrower, such
Lender and the Administrative Agent to issue Letters of Credit.

     “LC Commitment” at any time shall mean $20,000,000.

     “LC Exposure” at any time shall mean the difference between (i) the aggregate face
amount of all undrawn and uncancelled Letters of Credit plus the aggregate of all amounts drawn
under all Letters of Credit and not yet reimbursed, minus (ii) the aggregate amount of all
cash securing outstanding Letters of Credit pursuant to Section 2.10(b).

     “Letter of Credit Agreements” shall mean the written agreements with the Issuing Bank,
as issuing lender for any Letter of Credit, executed in connection with the issuance by the Issuing
Bank of the Letters of Credit, such agreements to be on the Issuing Bank’s customary form for
letters of credit of comparable amount and purpose as from time to time in effect or as otherwise
agreed to by the Borrower and the Issuing Bank.

     “Letters of Credit” shall mean the letters of credit issued pursuant to Section
2.01(b) and all reimbursement obligations pertaining to any such letters of credit, and “Letter of
Credit” shall mean any one of the Letters of Credit and the reimbursement obligations pertaining
thereto.

     “LIBOR” shall mean the rate of interest determined on the basis of the rate for
deposits in Dollars for a period equal to the applicable Interest Period commencing on the first
day of such Interest Period appearing on Dow Jones Market Service Page 3750 as of 11:00 a.m.
(London time) two (2) Business Days prior to the first day of the applicable Interest Period. In
the event that such rate does not appear on Dow Jones Market Service Page 3750, “LIBOR” shall be
determined by the Administrative Agent to be the rate per annum at which deposits in Dollars are
offered by leading reference banks in the London interbank market to UBOC at approximately 11:00
a.m. (London time) two Business Days prior to the first day of the applicable Interest Period for a
period equal to such Interest Period and in an amount substantially equal to the amount of the
applicable Loan.

     “LIBOR Loans” shall mean Loans the interest rates on which are determined on the basis
of rates referred to in the definition of “LIBOR Rate”.

     “LIBOR Rate” shall mean, with respect to any LIBOR Loan, a rate per annum (rounded
upwards, if necessary, to the nearest 1/100 of 1%) determined by the Administrative Agent to be

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equal to the quotient of (i) LIBOR for such Loan for the Interest Period for such Loan divided
by (ii) 1 minus the Reserve Requirement for such Loan for such Interest Period.

     “Lien” shall mean any interest in Property securing an obligation owed to, or a claim
by, a Person other than the owner of the Property, whether such interest is based on the common
law, statute or contract, and whether such obligation or claim is fixed or contingent, and
including but not limited to (i) the lien or security interest arising from a mortgage,
encumbrance, pledge, security agreement, conditional sale or trust receipt or a lease, consignment
or bailment for security purposes or (ii) production payments and the like payable out of Oil and
Gas Properties. The term “Lien” shall include reservations, exceptions, encroachments,
easements, rights of way, covenants, conditions, restrictions, leases and other title exceptions
and encumbrances affecting Property. For the purposes of this Agreement, the Borrower or any
Subsidiary shall be deemed to be the owner of any Property which it has acquired or holds subject
to a conditional sale agreement, or leases under a financing lease or other arrangement pursuant to
which title to the Property has been retained by or vested in some other Person in a transaction
intended to create a financing.

     “Loan Documents” shall mean this Agreement, the Notes, all Letters of Credit, all
Letter of Credit Agreements, the Fee Letter and the Security Instruments.

     “Loans” shall mean the loans as provided for by Section 2.01(a).

     “Majority Lenders” shall mean, at any time while no Loans or Letters of Credit are
outstanding, Lenders having at least sixty six and two thirds percent (66-2/3%) of the Aggregate
Commitments and, at any time while Loans or Letters of Credit are outstanding, Lenders holding at
least sixty six and two thirds percent (66-2/3%) of the outstanding aggregate principal amount of
the Loans and Letters of Credit (without regard to any sale by a Lender of a participation in any
Loan or Letter of Credit under Section 12.06(c)).

     “Material Adverse Effect” shall mean any set of circumstances or events that (i) has
or could reasonably be expected to have any material and adverse effect upon, or result in or
reasonably be expected to result in a material adverse change in, (A) the assets, liabilities,
prospects, financial condition, business, operations or affairs of the Borrower and its
Subsidiaries taken as a whole different from those reflected in the Financial Statements or the
financial statements most recently furnished pursuant to Section 8.01(a) or from the facts
represented or warranted in any Loan Document, or (B) the ability of the Borrower and its
Subsidiaries taken as a whole to carry out their business as at the Closing Date or as proposed as
of the Closing Date to be conducted or to duly and punctually pay and perform their obligations
under any of the Loan Documents, or (C) the validity, binding effect or enforceability of this
Agreement or any of the other Loan Documents or (ii) impairs materially or could reasonably be
expected to impair materially the ability of the Administrative Agent or any of the Lenders, to the
extent permitted, to enforce its legal remedies pursuant to the Loan Documents or otherwise
available at law or in equity.

     “Maximum Credit Amount” shall mean, as to each Lender, the amount set forth opposite
such Lender’s name on Annex I under the caption “Maximum Credit Amounts” (as the same

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may be reduced pursuant to Section 2.03(b) pro rata to each Lender based on its Percentage
Share), as modified from time to time to reflect any assignments permitted by Section 12.06(b).

     “Mortgaged Oil and Gas Property” shall mean any Borrowing Base Property that is
Collateral.

     “Multiemployer Plan” shall mean a Plan defined as such in Section 3(37) or 4001(a)(3)
of ERISA.

     “Notes” shall mean the Notes provided for by Section 2.06, together with any and all
renewals, extensions for any period, increases, rearrangements, substitutions, amendments, and/or
modifications thereof.

     “Obligations” shall mean all indebtedness, obligations and liabilities of the Borrower
to any of the Lenders, any of the Lenders’ Affiliates, any Issuing Bank or the Administrative
Agent, individually or collectively, existing on the date of this Agreement or arising thereafter,
direct or indirect, joint or several, absolute or contingent, matured or unmatured, liquidated or
unliquidated, secured or unsecured, arising or incurred under any Hedging Agreement, under this
Agreement or any of the other Loan Documents or in respect of any of the Loans made or
reimbursement obligations incurred or any of the Notes, Letters of Credit or other instruments at
any time evidencing any thereof, including interest accruing subsequent to the filing of a petition
or other action concerning bankruptcy or other similar proceedings, and all renewals, extensions,
rearrangements, amendments, refinancings, replacements and/or increases of the foregoing. The term
“Obligations” shall include, where the context refers to “Obligations” of any or all of the
Guarantors, all obligations of any or all of the Guarantors, pursuant to any and all guarantees,
guaranty agreements, and all other instruments, executed by any and all of the Guarantors, now or
in the future, guaranteeing all or any portion of the “Obligations” of the Borrower.

     “Oil and Gas Properties” shall mean Hydrocarbon Interests; the Properties now or
hereafter pooled or unitized with Hydrocarbon Interests; all presently existing or future
unitization, pooling agreements and declarations of pooled units and the units created thereby
(including without limitation all units created under orders, regulations and rules of any
Governmental Authority) which may affect all or any portion of the Hydrocarbon Interests; all
operating agreements, contracts and other agreements which relate to any of the Hydrocarbon
Interests or the production, sale, purchase, exchange or processing of Hydrocarbons from or
attributable to such Hydrocarbon Interests; all Hydrocarbons in and under and which may be produced
and saved or attributable to the Hydrocarbon Interests, including all oil in tanks, the lands
covered thereby and all rents, issues, profits, proceeds, products, revenues and other incomes from
or attributable to the Hydrocarbon Interests; all tenements, hereditaments, appurtenances and
Properties in any manner appertaining, belonging, affixed or incidental to the Hydrocarbon
Interests; and all Properties, rights, titles, interests and estates described or referred to
above, including any and all Property, real or personal, now owned or 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

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plants, plant compressors, pumps, pumping units, field gathering systems, tanks and tank
batteries, fixtures, valves, fittings, machinery and parts, engines, boilers, meters, apparatus,
equipment, appliances, tools, implements, cables, wires, towers, casing, tubing and rods, surface
leases, rights-of-way, easements and servitudes together with all additions, substitutions,
replacements, accessions and attachments to any and all of the foregoing.

     “Other Taxes” shall have the meaning assigned such term in Section 4.06(b).

     “PBGC” shall mean the Pension Benefit Guaranty Corporation or any entity succeeding to
any or all of its functions.

     “Percentage Share” shall mean the percentage of the Aggregate Commitments to be
provided by a Lender under this Agreement as indicated on Annex I hereto, as modified from
time to time to reflect any assignments permitted by Section 12.06(b).

     “Permitted Entrada Transaction” means (A) any Debt (i) incurred to finance the cost of
development of the Entrada Assets, (ii) which is non-recourse to the Borrower and its Subsidiaries,
and (iii) the provider of which shall have no recourse to any assets of the Borrower and its
Subsidiaries (other than the Entrada Assets and the capital stock or other equity interests of any
Subsidiary of Borrower substantially all of the assets of which consist of Entrada Assets) and (B)
any contribution, transfer or conveyance of all or a portion of the Entrada Assets to any Affiliate
of the Borrower (other than an Affiliate that is a Subsidiary of the Borrower that owns any
material or significant asset other than Entrada Assets or that is a Guarantor).

     “Permitted Medusa Transaction” means each of the following transactions now or
hereafter undertaken by the Borrower or any Subsidiary with respect to the development of Oil and
Gas Properties related to Mississippi Canyon Blocks 582, 538, 493, 624, 539, and 581 located in the
federal offshore waters of the Gulf of Mexico (the “Medusa Field”) in conjunction with the
other working interest owners in the Medusa Field:

     (i) the construction of the gas export line and related facilities designed to
transport natural gas production from the Medusa Field to downstream markets (the
“Medusa Gas System”); the conveyance of all or a portion thereof to a third party
(the “Medusa Gas System Owner”) upon completion thereof in consideration of the
Medusa Field working interest owners being reimbursed for all or a portion of their actual
costs incurred for construction of that portion of the Medusa Gas System so conveyed; and
the agreement of the Medusa Field working interest owners to transport all or a portion of
their future gas production from the Medusa Field for a gathering fee (which gathering fee
may vary based on actual throughput) paid to the Medusa Gas System Owner, pursuant to, among
other things, the documents and agreements listed as items 6 through 18 on Schedule 7.22, as
the same may be from time to time modified or amended;

     (ii) the construction of the oil export line and related facilities designed to
transport oil production from the Medusa Field to downstream markets (the “Medusa Oil
System”); the conveyance of all or a portion thereof to a third party (the “Medusa
Oil System Owner”) upon completion thereof in consideration of the Medusa Field working
interest owners being reimbursed for all or a portion of their actual costs incurred for

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construction of that portion of the Medusa Oil System so conveyed; and the agreement of
the Medusa Field working interest owners to transport all or a portion of their future oil
production from the Medusa Field for a transportation fee (which transportation fee may vary
based on actual throughput) paid to the Medusa Oil System Owner, pursuant to, among other
things, the documents and agreements listed as items 6 through 18 on Schedule 7.22, as the
same may be from time to time modified or amended; and

     (iii) the construction of a spar facility ( the “Medusa SPAR”) to produce and
process the Medusa field hydrocarbons; the conveyance of all or a portion thereof to an
Affiliate or a third party (the “Medusa SPAR Owner”) upon completion thereof in
consideration of the Medusa Field working interest owners being reimbursed for all or a
portion of their actual costs incurred for construction of that portion of the Medusa SPAR
so conveyed; and the agreement of the Medusa Field working interest owners to produce and
process all or a portion of their future production from the Medusa Field through the Medusa
SPAR for a tariff (which tariff may vary based on actual throughput) paid to the Medusa SPAR
Owner, pursuant to, among other things, the documents and agreements listed as items 6
through 18 on Schedule 7.22, as the same may be from time to time modified or amended.

     “Person” shall mean any individual, corporation, company, voluntary association,
partnership, joint venture, trust, unincorporated organization or government or any agency,
instrumentality or political subdivision thereof, or any other form of entity.

     “Plan” shall mean any employee pension benefit plan, as defined in Section 3(2) of
ERISA, which (i) is currently or hereafter sponsored, maintained or contributed to by the Borrower,
any Subsidiary or an ERISA Affiliate or (ii) was at any time during the preceding six calendar
years sponsored, maintained or contributed to, by the Borrower, any Subsidiary or an ERISA
Affiliate.

     “Post Default Rate” shall mean, in respect of any principal of any Loan and any past
due interest thereon or any other amount payable by the Borrower under this Agreement or any other
Loan Document, a rate per annum during the period commencing on the date of occurrence of an Event
of Default until such amount is paid in full or all Events of Default are cured or waived equal to
2% per annum above the Base Rate as in effect from time to time plus the Applicable Margin (if
any), but in no event to exceed the Highest Lawful Rate; provided however, that for a LIBOR Loan,
and any past due interest thereon, the “Post Default Rate” for such principal shall be, for
the period commencing on the date of occurrence of an Event of Default and ending on the earlier to
occur of the last day of the Interest Period therefor or the date all Events of Default are cured
or waived, 2% per annum above the interest rate for such Loan as provided in Section 3.02(a)(ii),
but in no event to exceed the Highest Lawful Rate.

     “Prime Rate” shall mean the rate of interest from time to time announced publicly by
the Administrative Agent at the Principal Office as its prime commercial lending rate. Such rate
is set by the Administrative Agent as a general reference rate of interest, taking into account
such factors as the Administrative Agent may deem appropriate, it being understood that many of the
Administrative Agent’s commercial or other loans are priced in relation to such rate, that it is
not necessarily the lowest or best rate actually charged to any customer and that the
Administrative

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Agent may make various commercial or other loans at rates of interest having no relationship
to such rate.

     “Principal Office” shall mean the principal office of the Administrative Agent,
presently located at 445 South Figueroa Street, Los Angeles, California 90071.

     “Prior Credit Agreement” shall mean that certain Credit Agreement dated as of June 14,
2004 among the Borrower, the lenders party thereto and UBOC, as a lender and administrative agent,
as amended, supplemented and modified on or before the Closing Date.

     “Prior Debt” shall mean the outstanding Debt under the Prior Credit Agreement.

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

     “Quarterly Dates” shall mean the last day of each March, June, September, and
December, in each year, the first of which shall be September 30, 2006.

     “Redetermination Date” shall mean the date that the redetermined Borrowing Base
becomes effective subject to the notice requirements specified in Section 2.08(e) both for
scheduled redeterminations and unscheduled redeterminations.

     “Regulation D” shall mean Regulation D of the Board of Governors of the Federal
Reserve System (or any successor), as the same may be amended or supplemented from time to time.

     “Regulatory Change” shall mean, with respect to any Lender, any change after the
Closing Date in any Governmental Requirement (including Regulation D) or the adoption or making
after such date of any interpretations, directives or requests applying to a class of lenders
(including such Lender or its Applicable Lending Office) of or under any Governmental Requirement
(whether or not having the force of law) by any Governmental Authority charged with the
interpretation or administration thereof.

     “Required Payment” shall have the meaning assigned such term in Section 4.04.

     “Reserve Report” shall mean a report, in form and substance satisfactory to the
Administrative Agent, setting forth, as of each January 1 or July 1 (or such other date in the
event of an unscheduled redetermination); (i) the oil and gas reserves attributable to the
Borrowing Base Properties together with a projection of the rate of production and future net
income, taxes, operating expenses and capital expenditures with respect thereto as of such date,
based upon the pricing assumptions consistent with SEC reporting requirements at the time and (ii)
such other information as the Administrative Agent may reasonably request.

     “Reserve Requirement” shall mean, for any Interest Period for any LIBOR Loan, the
average maximum rate at which reserves (including any marginal, supplemental or emergency reserves)
are required to be maintained during such Interest Period under Regulation D by member banks of the
Federal Reserve System in New York City with deposits exceeding one billion Dollars against
“Eurocurrency liabilities” (as such term is used in Regulation D).

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Without limiting the effect of the foregoing, the Reserve Requirement shall reflect any other
reserves required to be maintained by such member banks by reason of any Regulatory Change against
(i) any category of liabilities which includes deposits by reference to which LIBOR is to be
determined as provided in the definition of “LIBOR” or (ii) any category of extensions of credit or
other assets which include a LIBOR Loan.

     “Responsible Officer” shall mean, as to any Person, the Chief Executive Officer, the
President or any Vice President of such Person and, with respect to financial matters, the term
“Responsible Officer” shall include the Chief Financial Officer or the Treasurer of such Person.
Unless otherwise specified, all references to a Responsible Officer herein shall mean a Responsible
Officer of the Borrower.

     “Revolving Credit Termination Date” shall mean the earlier to occur of (i) July 31,
2010 or (ii) the date that the Commitments are sooner terminated pursuant to Sections 2.03(b) or
10.02.

     “Scheduled Redetermination Date” shall have the meaning assigned such term in Section
2.08(d).

     “SEC” shall mean the Securities and Exchange Commission or any successor Governmental
Authority.

     “Security Instruments” shall mean the agreements or instruments described or referred
to in Exhibit D, and any and all other agreements or instruments heretofore, now or hereafter
executed and delivered by the Borrower or any other Person (other than participation or similar
agreements between any Lender and any other lender or creditor with respect to any Obligations
pursuant to this Agreement) in connection with, or as security for the payment or performance of,
the Notes, this Agreement, the Prior Credit Agreement, or reimbursement obligations under the
Letters of Credit, as such agreements may be amended, supplemented or restated from time to time.

     “Special Entity” shall mean any joint venture, limited liability company or
partnership, general or limited partnership or any other type of partnership or company other than
a corporation in which a Person or one or more of its other Subsidiaries is a member, owner,
partner or joint venturer and owns, directly or indirectly, at least a majority of the equity of
such entity or controls such entity, but excluding any tax partnerships that are not classified as
partnerships under state law. For purposes of this definition, any Person which owns directly or
indirectly an equity investment in another Person which allows the first Person to manage or elect
managers who manage the normal activities of such second Person will be deemed to “control” such
second Person (e.g. a sole general partner controls a limited partnership).

     “Subordinated Debt” shall mean any Debt of the Borrower expressly subordinated to the
Obligations, on terms specifically including, without limitation, that payments on such Debt shall
be prohibited if a Default exists or would result from such payment, and other terms and conditions
and pursuant to documentation, all in form and substance satisfactory to the Majority Lenders.

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     “Subsidiary” shall mean (i) any corporation of which at least a majority of the
outstanding shares of stock having by the terms thereof ordinary voting power to elect a majority
of the board of directors of such corporation (irrespective of whether or not at the time stock of
any other class or classes of such corporation shall have or might have voting power by reason of
the happening of any contingency) is at the time directly or indirectly owned or controlled by
another Person or one or more of such Person’s Subsidiaries or by such Person and one or more of
its Subsidiaries and (ii) any Special Entity of which at least a majority of the equity interests
are owned, directly or indirectly or controlled by such Person. Unless otherwise indicated herein,
each reference to the term “Subsidiary” shall mean a Subsidiary of the Borrower.

     “Syndication Agent” shall mean Guaranty Bank.

     “Taxes” shall have the meaning assigned such term in Section 4.06(a).

     “Transfer” shall have the meaning assigned such term in Section 9.15.

     “Type” shall mean, with respect to any Loan, a Base Rate Loan or a LIBOR Loan.

     Section 1.03 Accounting Terms and Determinations. Unless otherwise specified herein,
all accounting terms used herein shall be interpreted, all determinations with respect to
accounting matters hereunder shall be made, and all financial statements and certificates and
reports as to financial matters required to be furnished to the Administrative Agent or the Lenders
hereunder shall be prepared, in accordance with GAAP, applied on a basis consistent with the
audited financial statements of the Borrower referred to in Section 7.02 (except for changes
concurred with by the Borrower’s independent public accountants).

ARTICLE II

Commitments

     Section 2.01 Loans and Letters of Credit.

     (a) Loans. Each Lender severally agrees, on the terms and conditions of this
Agreement, to make loans to the Borrower during the period from and including (i) the
Closing Date or (ii) such later date that such Lender becomes a party to this Agreement as
provided in Section 12.06(b), to and up to, but excluding, the Revolving Credit Termination
Date in an aggregate principal amount at any one time outstanding up to, but not exceeding,
the amount of such Lender’s Commitment as then in effect; provided, however,
that the aggregate principal amount of all such Loans by all Lenders hereunder at any one
time outstanding, plus the LC Exposure shall not exceed the Aggregate Commitments. Subject
to the terms of this Agreement, during the period from the Closing Date to and up to, but
excluding, the Revolving Credit Termination Date, the Borrower may borrow, repay and
reborrow the amount described in this Section 2.01(a).

     (b) Letters of Credit. During the period from and including the Closing Date
to, but excluding, the Revolving Credit Termination Date, the Issuing Bank, as issuing bank
for the Lenders, agrees to extend credit for the account of the Borrower or any Guarantor at
any time and from time to time by issuing, renewing, extending or reissuing

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Letters of Credit; provided, however, the LC Exposure at any one time
outstanding shall not exceed the lesser of (i) the LC Commitment or (ii) the Aggregate
Commitments, as then in effect, minus the aggregate principal amount of all Loans and the LC
Exposure then outstanding. The Lenders shall participate in such Letters of Credit
according to their respective Percentage Shares. Each of the Letters of Credit shall (i) be
issued by the Issuing Bank, (ii) contain such terms and provisions as are reasonably
required by the Issuing Bank, (iii) be for the account of the Borrower and (iv) expire not
later than the earlier to occur of (A) twenty-four months after the date of its issuance and
(B) ten (10) days before the Revolving Credit Termination Date.

     (c) Limitation on Types of Loans. Subject to the other terms and provisions of
this Agreement, at the option of the Borrower, the Loans may be Base Rate Loans or LIBOR
Loans; provided that, without the prior written consent of the Majority Lenders, no more
than ten (10) LIBOR Loans may be outstanding at any time.

     Section 2.02 Borrowings, Continuations and Conversions, Letters of Credit.

     (a) Borrowings. The Borrower shall give the Administrative Agent (which shall
promptly notify the Lenders) advance notice as hereinafter provided of each borrowing
hereunder, which shall specify (i) the aggregate amount of such borrowing, (ii) the Type and
(iii) the date (which shall be a Business Day) of the Loans to be borrowed, and (iv) (in the
case of LIBOR Loans) the duration of the Interest Period therefor.

     (b) Minimum Amounts. All Base Rate Loan borrowings shall be in amounts of at
least $100,000 or the remaining balance of the Aggregate Commitments, if less, or any whole
multiple of $50,000 in excess thereof, and all LIBOR Loans shall be in amounts of at least
$500,000 or any whole multiple of $100,000 in excess thereof.

     (c) Notices. All borrowings, continuations and conversions shall require
advance written notice to the Administrative Agent (which shall promptly notify the Lenders)
in the form of Exhibit B (or telephonic notice promptly confirmed by such a written
notice), which in each case shall be irrevocable, from the Borrower to be received by the
Administrative Agent not later than 10:00 a.m. Los Angeles, California time (i) on the date
of each Base Rate Loan borrowing and (ii) three Business Days prior to the date of each
LIBOR Loan borrowing, continuation or conversion. Without in any way limiting the
Borrower’s obligation to confirm in writing any telephonic notice, the Administrative Agent
may act without liability upon the basis of telephonic notice believed by the Administrative
Agent in good faith to be from the Borrower prior to receipt of written confirmation. In
each such case, the Borrower hereby waives the right to dispute the Administrative Agent’s
record of the terms of such telephonic notice except in the case of gross negligence or
willful misconduct by the Administrative Agent.

     (d) Continuation Options. Subject to the provisions made in this Section
2.02(d), the Borrower may elect to continue all or any part of any LIBOR Loan beyond the
expiration of the then current Interest Period relating thereto by giving advance notice as
provided in Section 2.02(c) to the Administrative Agent (which shall promptly notify the
Lenders) of such election, specifying the amount of such Loan to be continued and

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the Interest Period therefor. In the absence of such a timely and proper election, the
Borrower shall be deemed to have elected to convert such LIBOR Loan to a Base Rate Loan
pursuant to Section 2.02(e). All or any part of any LIBOR Loan may be continued as provided
herein, provided that (i) any continuation of any such Loan shall be (as to each Loan as
continued for an applicable Interest Period) in amounts of at least $500,000 or any whole
multiple of $100,000 in excess thereof and (ii) no Default shall have occurred and be
continuing. If a Default shall have occurred and be continuing, each LIBOR Loan shall be
converted to a Base Rate Loan on the last day of the Interest Period applicable thereto.

     (e) Conversion Options. The Borrower may elect to convert all or any part of
any LIBOR Loan on the last day of the then current Interest Period relating thereto to a
Base Rate Loan by giving advance notice to the Administrative Agent (which shall promptly
notify the Lenders) of such election. Subject to the provisions made in this Section
2.02(e), the Borrower may elect to convert all or any part of any Base Rate Loan at any time
and from time to time to a LIBOR Loan by giving advance notice as provided in Section
2.02(c) to the Administrative Agent (which shall promptly notify the Lenders) of such
election. All or any part of any outstanding Loan may be converted as provided herein,
provided that (i) any conversion of any Base Rate Loan into a LIBOR Loan shall be (as to
each such Loan into which there is a conversion for an applicable Interest Period) in
amounts of at least $500,000 or any whole multiple of $100,000 in excess thereof and (ii) no
Default shall have occurred and be continuing. If a Default shall have occurred and be
continuing, no Base Rate Loan may be converted into a LIBOR Loan.

     (f) Advances. Not later than 11:00 a.m. Los Angeles, California time on the
date specified for each borrowing hereunder, each Lender shall make available the amount of
the Loan to be made by it on such date to the Administrative Agent, to an account which the
Administrative Agent shall specify, in immediately available funds, for the account of the
Borrower. The amounts so received by the Administrative Agent shall be made available to
Borrower by depositing the same, in immediately available funds, in an account of the
Borrower, designated by the Borrower.

     (g) Letters of Credit.

          (i) The Borrower shall give the Issuing Bank (which shall promptly notify the Lenders
of such request and their Percentage Share of such Letter of Credit, with a copy to the
Administrative Agent) advance notice to be received by the Issuing Bank not later than 11:00
a.m. Los Angeles, California time not less than three (3) Business Days prior thereto of
each request for the issuance, and at least three (3) Business Days prior to the date of the
renewal or extension, of a Letter of Credit hereunder which request shall specify (i) the
amount of such Letter of Credit which shall be at least $50,000, (ii) the date (which shall
be a Business Day) such Letter of Credit is to be issued, renewed or extended, (iii) the
duration thereof, (iv) the name and address of the beneficiary thereof, (v) the type of the
Letter of Credit and (vi) such other information as the Issuing Bank may reasonably request,
all of which shall be reasonably satisfactory to the Issuing Bank. Subject to the terms and
conditions of this Agreement, on the date

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specified for the issuance, renewal or extension of a Letter of Credit, the Issuing
Bank shall issue, renew or extend such Letter of Credit to the beneficiary thereof.

          (ii) In conjunction with the issuance of each Letter of Credit, the Borrower and the
applicable Guarantor, if the account party, shall execute a Letter of Credit Agreement. In
the event of any conflict between any provision of a Letter of Credit Agreement and this
Agreement, the Borrower, the Issuing Bank, the Administrative Agent and the Lenders hereby
agree that the provisions of this Agreement shall govern.

          (iii) The Issuing Bank will send to the Borrower, the Administrative Agent and each
Lender, immediately upon issuance of any Letter of Credit, or an amendment thereto, a true
and complete copy of such Letter of Credit, or such amendment thereto.

     Section 2.03 Changes of Commitments.

     (a) The Aggregate Commitments shall at all times be equal to the lesser of (i) the
Aggregate Maximum Credit Amounts after adjustments resulting from reductions pursuant to
Section 2.03(b) or (ii) the Borrowing Base as determined from time to time.

     (b) The Borrower shall have the right to terminate or to reduce the amount of the
Aggregate Maximum Credit Amounts at any time, or from time to time, upon not less than three
(3) Business Days’ prior notice to the Administrative Agent (which shall promptly notify the
Lenders) of each such termination or reduction, which notice shall specify the effective
date thereof and the amount of any such reduction (which shall not be less than $1,000,000
or any whole multiple of $1,000,000 in excess thereof) and shall be irrevocable and
effective only upon receipt by the Administrative Agent. Each reduction in the Aggregate
Maximum Credit Amount shall apply pro rata to each Lender based on its Percentage Share.

     (c) The Aggregate Maximum Credit Amounts once terminated or reduced may not be
reinstated.

     Section 2.04 Fees.

     (a) Commitment Fee. The Borrower shall pay to the Administrative Agent for the
account of each Lender a commitment fee on the daily unused amount of the Aggregate
Commitments for the period from and including the Closing Date up to, but excluding, the
earlier of the date the Aggregate Commitments are terminated or the Revolving Credit
Termination Date at a rate per annum equal to the rate set forth at the appropriate
intersection in the table set forth below:

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	Borrowing Base Utilization	 	Rate
	Less than 90%
	 	 	0.375	%
	 
	 	 	 	 
	Greater than or equal to 90%
	 	 	0.250	%

Accrued commitment fees shall be payable quarterly in arrears on each Quarterly Date and on the
earlier of the date the Aggregate Commitments are terminated or the Revolving Credit Termination
Date.

     (b) Letter of Credit Fees.

          (i) The Borrower agrees to pay the Administrative Agent, for the account of each
Lender, commissions for issuing the Letters of Credit on the daily average outstanding of
the maximum liability of the Issuing Bank existing from time to time under such Letters of
Credit (calculated separately for each Letter of Credit) at the per annum rate equal to the
then effective Applicable Margin for LIBOR Loans, provided that each Letter of Credit shall
bear a minimum commission of $500. Each Letter of Credit shall be deemed to be outstanding
up to the full face amount of the Letter of Credit until the Issuing Bank has received the
canceled Letter of Credit or a written cancellation of the Letter of Credit from the
beneficiary of such Letter of Credit in form and substance acceptable to the Issuing Bank,
or for any reductions in the amount of the Letter of Credit (other than from a drawing),
written notification from the beneficiary of such Letter of Credit. Such commissions are
payable quarterly in arrears on each Quarterly Date and upon cancellation or expiration of
each such Letter of Credit.

          (ii) The Issuing Bank, for its own account, shall receive 0.125% of the face amount of
each Letter of Credit as an issuing fee.

          (iii) The Borrower agrees to pay concurrently with each issuance, negotiation, drawing,
or amendment of each Letter of Credit, to the Issuing Bank for the sole account of the
Issuing Bank, issuance, negotiation, drawing and amendment fees in the amounts set forth
from time to time as the Issuing Bank’s published scheduled fees for such services.

     (c) Fee Letter. The Borrower shall pay to the Administrative Agent such other
fees as are set forth in the Fee Letter on the dates and in the amounts specified therein.

     Section 2.05 Several Obligations. The failure of any Lender to make any Loan to be
made by it or to provide funds for disbursements or reimbursements under Letters of Credit on the
date specified therefor shall not relieve any other Lender of its obligation to make its Loan or
provide funds on such date, but no Lender shall be responsible for the failure of any other Lender
to make a Loan to be made by such other Lender or to provide funds to be provided by such other
Lender.

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     Section 2.06 Notes. The Loans made by each Lender shall be evidenced by a single
promissory note of the Borrower in substantially the form of Exhibit A, dated (i) the
Closing Date or (ii) the effective date of an Assignment pursuant to Section 12.06(b), payable to
the order of such Lender in a principal amount equal to its Maximum Credit Amount as originally in
effect and otherwise duly completed and such substitute Notes as required by Section 12.06(b). The
date, amount, Type, interest rate and Interest Period of each Loan made by each Lender, and all
payments made on account of the principal thereof, shall be recorded by such Lender on its books
for its Note, and, prior to any transfer may be endorsed by such Lender on the schedule attached to
such Note or any continuation thereof or on any separate record maintained by such Lender. Failure
to make any such notation or to attach a schedule shall not affect any Lender’s or the Borrower’s
rights or obligations in respect of such Loans or affect the validity of such transfer by any
Lender of its Note.

     Section 2.07 Prepayments.

     (a) Voluntary Prepayments. The Borrower may prepay the Base Rate Loans upon
not less than one (1) Business Day’s prior notice to the Administrative Agent (which shall
promptly notify the Lenders), which notice shall specify the prepayment date (which shall be
a Business Day) and the amount of the prepayment (which shall be at least $100,000 or the
remaining aggregate principal balance outstanding on the Notes) and shall be irrevocable and
effective only upon receipt by the Administrative Agent, provided that interest on the
principal prepaid, accrued to the prepayment date, shall be paid on the prepayment date.
The Borrower may prepay LIBOR Loans on the same conditions as for Base Rate Loans (except
that prior notice to the Administrative Agent shall be not less than three (3) Business Days
for LIBOR Loans) and in addition such prepayments of LIBOR Loans shall be subject to the
terms of Section 5.05 and shall be in an amount equal to all of the LIBOR Loans for the
Interest Period prepaid provided that interest on the principal prepaid accrued to the
prepayment date, shall be paid on the prepayment date.

     (b) Mandatory Prepayments.

          (i) If, after giving effect to any optional termination or reduction by the Borrower of
the Aggregate Maximum Credit Amounts pursuant to Section 2.03(b), the outstanding aggregate
principal amount of the Loans plus the LC Exposure exceeds the Aggregate Maximum Credit
Amounts, the Borrower shall (i) prepay the Loans on the date of such termination or
reduction in an aggregate principal amount equal to the excess, together with interest on
the principal amount paid accrued to the date of such prepayment and (ii) if any excess
remains after prepaying all of the Loans because of LC Exposure, pay to the Administrative
Agent on behalf of the Lenders an amount equal to the excess to be held as cash collateral
as provided in Section 2.10(b) hereof.

          (ii) Upon any redetermination of the amount of the Borrowing Base in accordance with
Section 2.08, if the redetermined Borrowing Base results in a Borrowing Base Deficiency,
then the Borrower shall within thirty (30) days of receipt of written notice thereof either:
(A) prepay the Loans (and provide cash collateral for the Letters of Credit) in an aggregate
principal amount equal to the Borrowing Base Deficiency,

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together with interest on the principal amount paid accrued to the date of such
prepayment; or (B) the Borrower shall notify the Administrative Agent (which will promptly
notify the Lenders) in writing of the Borrower’s election to initiate a Deficiency Period
during which it will eliminate such Borrowing Base Deficiency by making six (6) consecutive
monthly Deficiency Payments, the first of such payments being due and payable with the
delivery to the Administrative Agent of such notice and each of the remaining payments due
and payable on the same day of each month thereafter during the Deficiency Period; provided
however, in the event of an acceleration of the maturity of the Notes pursuant to Section
10.02 hereof, such acceleration shall also accelerate the maturity of all outstanding and
unpaid Deficiency Payments. All payments under this subsection (ii), whether a single
payment under clause (A) or monthly Deficiency Payments under clause (B), shall be applied
in the order of priority specified in Section 3.03, and any payments required by Section
3.03(a)(iii) to be held as cash collateral shall be held in accordance with Section 2.10(b).

     (c) Generally. Prepayments permitted or required under this Section 2.07 shall
be without premium or penalty, except as required under Section 5.05 for prepayment of LIBOR
Loans. Any prepayments on the Loans may be reborrowed subject to the then effective
Aggregate Commitments.

     Section 2.08 Borrowing Base.

     (a) The Borrowing Base shall be determined in accordance with Section 2.08(b) by the
Administrative Agent with the concurrence of the Lenders and is subject to redetermination
in accordance with Section 2.08(d). Upon any redetermination of the Borrowing Base, such
redetermination shall remain in effect until the next successive Redetermination Date. So
long as any of the Commitments are in effect or any LC Exposure or Loans are outstanding
hereunder, this facility shall be governed by the then effective Borrowing Base. During the
period from and after the Closing Date until the first redetermination pursuant to Section
2.08(d) or adjusted pursuant to Section 8.08(c), the amount of the Borrowing Base shall be
$75,000,000.

     (b) Upon receipt of the reports required by Section 8.07 and such other reports, data
and supplemental information as may from time to time be reasonably requested by the
Administrative Agent (the “Engineering Reports”), the Administrative Agent will
redetermine the Borrowing Base. Such redetermination will be in accordance with its normal
and customary procedures for evaluating oil and gas reserves and other related assets as
such exist at that particular time, and the Administrative Agent, in its sole discretion,
may make adjustments to the rates, volumes and prices and other assumptions set forth
therein in accordance with its normal and customary procedures for evaluating oil and gas
reserves and other related assets as such exist at that particular time. The Administrative
Agent shall propose to the Lenders a new Borrowing Base within 30 days following receipt by
the Administrative Agent and the Lenders of the Engineering Reports in a timely and complete
manner. After having received notice of such proposal by the Administrative Agent, the
Lenders shall have 14 days to agree or disagree with such proposal. Any Lenders that have
not communicated their approval or disapproval at the end of the 14 days shall be deemed to
have approved the

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Administrative Agent’s proposal of the redetermined Borrowing Base. To the extent
that within such 14 days the Administrative Agent has not received the requisite number of
approvals from the Lenders of the redetermined Borrowing Base, the requisite number of
Lenders shall, within a reasonable period of time, agree on a new Borrowing Base. Any
increase in the Borrowing Base must be approved by the Administrative Agent and all of the
Lenders and any decrease in or reaffirmation of the existing Borrowing Base must be approved
by the Majority Lenders.

     (c) The Administrative Agent may exclude any Oil and Gas Property or portion of
production therefrom or any income from any other Property from the Borrowing Base, at any
time, because title information is not reasonably satisfactory, such Property is not
Collateral or such Property is not assignable.

     (d) So long as any of the Commitments are in effect and until payment in full of all
Loans hereunder, on or around the first Business Day of each May and November, commencing
November 2006 (each being a “Scheduled Redetermination Date”), the Lenders shall
redetermine the amount of the Borrowing Base in accordance with Section 2.08(b). In
addition, (i) the Borrower may initiate a redetermination of the Borrowing Base at any other
time as it so elects by specifying in writing to the Administrative Agent (who will promptly
notify the Lenders) the date by which the Borrower will furnish to the Administrative Agent
and the Lenders a Reserve Report in accordance with Section 8.07(b) and the date by which
such redetermination is requested to occur; provided, however, that the
Borrower may initiate only one such unscheduled redetermination between Scheduled
Redetermination Dates during the first twelve (12) months after the Closing Date and
thereafter, may initiate only one such unscheduled redetermination per year and (ii) the
Majority Lenders may initiate a redetermination of the Borrowing Base at any other time as
they so elect by specifying in writing to the Borrower the date by which the Borrower is to
furnish a Reserve Report in accordance with Section 8.07(b) and the date on which such
redetermination is to occur; provided, however, that the Majority Lenders
may initiate only one such unscheduled redetermination between Scheduled Redetermination
Dates during the first twelve (12) months after the Closing Date and thereafter, may
initiate only one such unscheduled redetermination per year.

     (e) The Administrative Agent shall promptly notify in writing the Borrower and the
Lenders of the new Borrowing Base. Any redetermination of the Borrowing Base shall not be
in effect until written notice is received by the Borrower.

     Section 2.09 Assumption of Risks. The Borrower assumes all risks of the acts or
omissions of any beneficiary of any Letter of Credit or any transferee thereof with respect to its
use of such Letter of Credit. Neither the Issuing Bank (except in the case of gross negligence or
willful misconduct on the part of the Issuing Bank or any of its employees), its correspondents nor
any Lender shall be responsible for the validity, sufficiency or genuineness of certificates or
other documents or any endorsements thereon, even if such certificates or other documents should in
fact prove to be invalid, insufficient, fraudulent or forged; for errors, omissions, interruptions
or delays in transmissions or delivery of any messages by mail, telex, or otherwise, whether or not
they be in code; for errors in translation or for errors in interpretation of technical terms; the
validity or sufficiency of any instrument transferring or assigning or purporting to

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transfer or assign any Letter of Credit or the rights or benefits thereunder or proceeds
thereof, in whole or in part, which may prove to be invalid or ineffective for any reason; the
failure of any beneficiary or any transferee of any Letter of Credit to comply fully with
conditions required in order to draw upon any Letter of Credit; or for any other consequences
arising from causes beyond the Issuing Bank’s control or the control of the Issuing Bank’s
correspondents (including the Issuing Bank’s own negligence). In addition, neither the
Issuing Bank, the Administrative Agent nor any Lender shall be responsible for any error, neglect,
or default of any of the Issuing Bank’s correspondents; and none of the above shall affect, impair
or prevent the vesting of any of the Issuing Bank’s, the Administrative Agent’s or any Lender’s
rights or powers hereunder or under the Letter of Credit Agreements, all of which rights shall be
cumulative. The Issuing Bank and its correspondents may accept certificates or other documents
that appear on their face to be in order, without responsibility for further investigation of any
matter contained therein regardless of any notice or information to the contrary. In furtherance
and not in limitation of the foregoing provisions, the Borrower agrees that any action, inaction or
omission taken or not taken by the Issuing Bank or by any correspondent for the Issuing Bank in
good faith in connection with any Letter of Credit, or any related drafts, certificates, documents
or instruments, shall be binding on the Borrower and shall not put the Issuing Bank or its
correspondents under any resulting liability to the Borrower.

     Section 2.10 Obligation to Reimburse and to Prepay.

     (a) If a disbursement by the Issuing Bank is made under any Letter of Credit, the
Borrower shall pay to the Administrative Agent within two (2) Business Days after notice of
any such disbursement is received by the Borrower, the amount of each such disbursement made
by the Issuing Bank under the Letter of Credit (if such payment is not sooner effected as
may be required under this Section 2.10 or under other provisions of the Letter of Credit),
together with interest on the amount disbursed from and including the date of disbursement
until payment in full of such disbursed amount at a varying rate per annum equal to (i) the
then applicable interest rate for Base Rate Loans through the second Business Day after
notice of such disbursement is received by the Borrower and (ii) thereafter, the
Post-Default Rate for Base Rate Loans (but in no event to exceed the Highest Lawful Rate)
for the period from and including the third Business Day following the date of such
disbursement to and including the date of repayment in full of such disbursed amount. The
obligations of the Borrower under this Agreement with respect to each Letter of Credit shall
be absolute, unconditional and irrevocable and shall be paid or performed strictly in
accordance with the terms of this Agreement under all circumstances whatsoever, including,
without limitation, but only to the fullest extent permitted by applicable law, the
following circumstances: (i) any lack of validity or enforceability of this Agreement, any
Letter of Credit or any of the Security Instruments; (ii) any amendment or waiver of
(including any default), or any consent to departure from this Agreement (except to the
extent permitted by any amendment or waiver), any Letter of Credit or any of the Security
Instruments; (iii) the existence of any claim, set-off, defense or other rights which the
Borrower may have at any time against the beneficiary of any Letter of Credit or any
transferee of any Letter of Credit (or any Persons for whom any such beneficiary or any such
transferee may be acting), the Issuing Bank, the Administrative Agent, any Lender or any
other Person, whether in connection with this Agreement, any Letter of Credit, the Security
Instruments, the transactions contemplated

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hereby or any unrelated transaction; (iv) any statement, certificate, draft, notice or
any other document presented under any Letter of Credit proves to have been forged,
fraudulent, insufficient or invalid in any respect or any statement therein proves to have
been untrue or inaccurate in any respect whatsoever; (v) payment by the Issuing Bank under
any Letter of Credit against presentation of a draft or certificate which appears on its
face to comply, but does not comply, with the terms of such Letter of Credit; and (vi) any
other circumstance or happening whatsoever, whether or not similar to any of the foregoing.

Notwithstanding anything in this Agreement to the contrary, the Borrower will not be liable
for payment or performance that results from the gross negligence or willful misconduct of
the Issuing Bank, except where the Borrower or any Subsidiary actually recovers the proceeds
for itself or the Issuing Bank of any payment made by the Issuing Bank in connection with
such gross negligence or willful misconduct.

     (b) In the event of a payment or prepayment pursuant to Section 2.07(b) or the maturity
of the Notes, whether by acceleration or otherwise, an amount equal to the LC Exposure (or
the excess in the case of Section 2.07(b)) shall be deemed to be forthwith due and owing by
the Borrower to the Issuing Bank, the Administrative Agent and the Lenders as of the date of
any such occurrence; and the Borrower’s obligation to pay such amount shall be absolute and
unconditional, without regard to whether any beneficiary of any such Letter of Credit has
attempted to draw down all or a portion of such amount under the terms of a Letter of
Credit, and, to the fullest extent permitted by applicable law, shall not be subject to any
defense or be affected by a right of set-off, counterclaim or recoupment which the Borrower
may now or hereafter have against any such beneficiary, the Issuing Bank, the Administrative
Agent, the Lenders or any other Person for any reason whatsoever. Such payments shall be
held by the Issuing Bank on behalf of the Lenders as cash collateral securing the LC
Exposure in an account or accounts at the Principal Office; and the Borrower hereby grants
to and by its deposit with the Administrative Agent grants to the Administrative Agent a
security interest in such cash collateral. In the event of any such payment by the Borrower
of amounts contingently owing under outstanding Letters of Credit and in the event that
thereafter drafts or other demands for payment complying with the terms of such Letters of
Credit are not made prior to the respective expiration dates thereof, the Administrative
Agent agrees, if no Event of Default has occurred and is continuing or if no other amounts
are outstanding under this Agreement, the Notes or the Security Instruments, to remit to the
Borrower amounts for which the contingent obligations evidenced by the Letters of Credit
have ceased.

     (c) Each Lender severally and unconditionally agrees that it shall promptly reimburse
the Issuing Bank an amount equal to such Lender’s Percentage Share of any disbursement made
by the Issuing Bank under any Letter of Credit that is not reimbursed according to this
Section 2.10.

     (d) Notwithstanding anything to the contrary contained herein, if no Default exists and
subject to availability under the Aggregate Maximum Credit Amount (after reduction for LC
Exposure), to the extent the Borrower has not reimbursed the Issuing

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Bank for any drawn upon Letter of Credit within one (1) Business Day after notice of
such disbursement has been received by the Borrower, the amount of such Letter of Credit
reimbursement obligation shall automatically be funded by the Lenders as a Base Rate Loan
hereunder and used by the Lenders to pay such Letter of Credit reimbursement obligation. If
the funding of such Letter of Credit reimbursement obligation as a Base Rate Loan would
cause the aggregate amount of all Loans outstanding to exceed the Aggregate Maximum Credit
Amount (after reduction for LC Exposure), such Letter of Credit reimbursement obligation
shall not be funded as a Base Rate Loan, but instead shall accrue interest as provided in
Section 2.10(a).

     Section 2.11 Lending Offices. The Loans of each Type made by each Lender shall be
made and maintained at such Lender’s Applicable Lending Office for Loans of such Type.

ARTICLE III

Payments of Principal and Interest

     Section 3.01 Repayment of Principal.

     (a) Loans. On the Revolving Credit Termination Date the Borrower shall repay
the outstanding aggregate principal of the Loans and the Notes evidencing the Loans.

     (b) Generally. The Borrower will pay to the Administrative Agent, for the
account of each Lender, the principal payments required by this Section 3.01.

     Section 3.02 Payment of Interest.

     (a) Interest Rates. The Borrower will pay to the Administrative Agent, for the
account of each Lender, interest on the unpaid principal amount of each Loan made by such
Lender for the period commencing on the date such Loan is made to, but excluding, the date
such Loan shall be paid in full, at the following rates per annum:

          (i) if such a Loan is a Base Rate Loan, the Base Rate (as in effect from time to time)
plus the Applicable Margin, but in no event to exceed the Highest Lawful Rate; and

          (ii) if such a Loan is a LIBOR Loan, for each Interest Period relating thereto, the
LIBOR Rate for such Loan plus the Applicable Margin (as in effect from time to time), but in
no event to exceed the Highest Lawful Rate.

     (b) Post-Default Rate. Notwithstanding the foregoing, the Borrower will pay to
the Administrative Agent, for the account of each Lender interest at the applicable
Post-Default Rate on any principal of any Loan made by such Lender, and (to the fullest
extent permitted by law) on any other amount payable by the Borrower hereunder, under any
Loan Document or under any Note held by such Lender to or for account of such Lender, for
the period commencing on the date of an Event of Default until the same is paid in full or
all Events of Default are cured or waived.

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     (c) Due Dates. Accrued interest on Base Rate Loans shall be payable on each
Quarterly Date commencing on September 30, 2006, and accrued interest on each LIBOR Loan
shall be payable on the last day of the Interest Period therefor and, if such Interest
Period is longer than three months at three-month intervals following the first day of such
Interest Period, except that interest payable at the Post-Default Rate shall be payable from
time to time on demand and interest on any LIBOR Loan that is converted into a Base Rate
Loan (pursuant to Section 5.04) shall be payable on the date of conversion (but only to the
extent so converted). Any accrued and unpaid interest on the Loans on the Revolving Credit
Termination Date shall be paid on such date.

     (d) Determination of Rates. Promptly after the determination of any interest
rate provided for herein or any change therein, the Administrative Agent shall notify the
Lenders to which such interest is payable and the Borrower thereof. Each determination by
the Administrative Agent of an interest rate or fee hereunder shall, except in cases of
manifest error, be final, conclusive and binding on the parties.

     Section 3.03 Payment Waterfall. Notwithstanding any other provision in this Agreement
or any other Loan Document to the contrary:

     (a) Whenever the Borrower (or any Guarantor) pays or is required to make payments on
the Obligations, or whenever any Lender receives (and such funds were not received from the
Administrative Agent in accordance with the priorities established by this Section 3.03) or
has the right to receive funds to be applied to the Obligations (whether in bankruptcy,
pursuant to Section 4.05, or otherwise), or whenever the Administrative Agent holds proceeds
of collection or other funds to be applied to the Obligations, in each case whether before
or after maturity (and notwithstanding any bankruptcy, insolvency, or any other proceeding),
such payments shall be made and such proceeds and other funds shall be applied in the
following order of priority:

          (i) first, to reimbursements of expenses and payment of indemnities due and owing at
the time in question to the Administrative Agent or the Lenders under this Agreement and the
other Loan Documents;

          (ii) second, to accrued interest (including, without limitation, interest which may
accrue subsequent to Borrower or any Guarantor becoming subject to any state or federal
debtor-relief statute), fees, and principal then due and owing to the Lenders (whether such
principal is due and owing at maturity, due to acceleration, or due to a reduction in the
Borrowing Base, or for any reason), together with any payments then due and owing to the
Lenders or their Affiliates under Hedging Agreements permitted hereunder;

          (iii) third, to the extent expressly required at such time under Section 2.10(b), to
serve as cash collateral to be held by the Administrative Agent to secure the LC Exposure;

          (iv) fourth, to the prepayment of principal on the Loans until they are paid in full;

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          (v) fifth, to the pro rata payment of all other Obligations; and

          (vi) last, any excess shall be paid to the Borrower or as otherwise required by any
Governmental Requirement.

     (b) Payments must be made in accordance with the foregoing order of priority whether or
not the Borrower provides sufficient funds to make all payments due on the Obligations at
the time in question, but compliance with such order of priority does not relieve the
Borrower of its duty to make all payments of the Obligations whenever they become due and
any breach of such duty shall constitute an Event of Default or Default as provided in
Section 10.01.

     (c) Should any Lender receive any funds to be applied to the Obligations from any
source whatsoever (whether in bankruptcy, pursuant to Section 4.05, or otherwise) and such
funds have not been distributed to the Lenders in accordance with the provisions of this
Section 3.03, such funds shall immediately be paid to the Administrative Agent who shall
distribute such funds in accordance with the provisions of this Section 3.03. The Lenders
grant to the Administrative Agent the right to enforce, collect and receive any such payment
or distribution and to give releases or acquittances therefor, subject, however to the
express provisions contained in this Agreement permitting all or certain Lenders to direct
the Administrative Agent to act or refrain from acting; provided, however, that nothing
contained in this section shall prohibit the Lenders from suing for collections of principal
on the Notes at maturity or for collection of interest on the Notes provided that the
Administrative Agent has not already commenced such suits, and provided that the Lenders
have the right to bring such suits under the provisions of this Agreement including, without
limitation, all provisions under Section 10.02; provided that if any sums are collected by
any of the Lenders, they will be paid to the Administrative Agent for payment and
distribution in accordance with Section 3.03.

ARTICLE IV

Payments; Pro Rata Treatment; Computations; Etc.

     Section 4.01 Payments. Except to the extent otherwise provided herein, all payments
of principal, interest and other amounts to be made by the Borrower under this Agreement, the Notes
and the Letter of Credit Agreements shall be made in Dollars, in immediately available funds, to
the Administrative Agent at such account as the Administrative Agent shall specify by notice to the
Borrower from time to time, not later than 11:00 a.m. Los Angeles, California time on the date on
which such payments shall become due (each such payment made after such time on such due date to be
deemed to have been made on the next succeeding Business Day). Such payments shall be made without
(to the fullest extent permitted by applicable law) defense, set-off or counterclaim. Each payment
received by the Administrative Agent under this Agreement or any Note for account of a Lender shall
be paid promptly to such Lender in immediately available funds. Except as otherwise provided in
the definition of “Interest Period”, if the due date of any payment under this Agreement or any
Note would otherwise fall on a day which is not a Business Day such date shall be extended to the
next succeeding Business Day and interest shall be payable for any principal so extended for the
period of such extension. At the time of

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each payment to the Administrative Agent of any principal of or interest on any borrowing, the
Borrower shall notify the Administrative Agent of the Loans to which such payment shall apply. In
the absence of such notice the Administrative Agent may specify the Loans to which such payment
shall apply, but to the extent possible such payment or prepayment will be applied first to the
Loans comprised of Base Rate Loans.

     Section 4.02 Pro Rata Treatment. Except to the extent otherwise provided herein each
Lender agrees that: (i) each borrowing from the Lenders under Section 2.01 and each continuation
and conversion under Section 2.02 shall be made from the Lenders pro rata in accordance with their
Percentage Share, each payment of commitment fee under Section 2.04(a) shall be made for account of
the Lenders pro rata in accordance with their Percentage Share, and each termination or reduction
of the amount of the Aggregate Maximum Credit Amounts under Section 2.03(b) shall be applied to the
Commitment of each Lender, pro rata according to the amounts of its respective Commitment; (ii)
each payment of principal of Loans by the Borrower shall be made for account of the Lenders pro
rata in accordance with the respective unpaid principal amount of the Loans held by the Lenders;
and (iii) each payment of interest on Loans by the Borrower shall be made for account of the
Lenders pro rata in accordance with the amounts of interest due and payable to the respective
Lenders; and (iv) each reimbursement by the Borrower of disbursements under Letters of Credit shall
be made for account of the Issuing Bank or, if funded by the Lenders, pro rata for the account of
the Lenders, in accordance with the amounts of reimbursement obligations due and payable to each
respective Lender.

     Section 4.03 Computations. Interest on LIBOR Loans and fees shall be computed on the
basis of a year of 360 days and actual days elapsed (including the first day but excluding the last
day) occurring in the period for which such interest is payable, unless such calculation would
exceed the Highest Lawful Rate, in which case interest shall be calculated on the per annum basis
of a year of 365 or 366 days, as the case may be. Interest on Base Rate Loans shall be computed on
the basis of a year of 365 or 366 days, as the case may be, and actual days elapsed (including the
first day but excluding the last day) occurring in the period for which such interest is payable.

     Section 4.04 Non-receipt of Funds by the Administrative Agent. Unless the
Administrative Agent shall have been notified by a Lender or the Borrower prior to the date on
which such notifying party is scheduled to make payment to the Administrative Agent (in the case of
a Lender) of the proceeds of a Loan or a payment under a Letter of Credit to be made by it
hereunder or (in the case of the Borrower) a payment to the Administrative Agent for account of one
or more of the Lenders hereunder (such payment being herein called the “Required Payment”),
which notice shall be effective upon receipt, that it does not intend to make the Required Payment
to the Administrative Agent, the Administrative Agent may assume that the Required Payment has been
made and may, in reliance upon such assumption (but shall not be required to), make the amount
thereof available to the intended recipient(s) on such date and, if such Lender or the Borrower (as
the case may be) has not in fact made the Required Payment to the Administrative Agent, the
recipient(s) of such payment shall, on demand, repay to the Administrative Agent the amount so made
available together with interest thereon in respect of each day during the period commencing on the
date such amount was so made available by the Administrative Agent until, but excluding, the date
the Administrative Agent recovers such amount at a rate per annum which, for any Lender as
recipient, will be equal to the Federal Funds

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Rate, and for the Borrower as recipient, will be equal to the Base Rate plus the Applicable
Margin.

     Section 4.05 Set-off, Sharing of Payments, Etc.

     (a) The Borrower agrees that, in addition to (and without limitation of) any right of
set-off, bankers’ lien or counterclaim a Lender may otherwise have, each Lender shall have
the right and be entitled (after consultation with the Administrative Agent), at its option,
to offset balances held by it or by any of its Affiliates for account of the Borrower or any
Guarantor at any of its offices, in Dollars or in any other currency, against any principal
of or interest on any of such Lender’s Loans, or any other amount payable to such Lender
hereunder, which is not paid when due after the passage of any applicable grace periods
(regardless of whether such balances are then due to the Borrower), in which case it shall
promptly notify the Borrower and the Administrative Agent thereof, provided that such
Lender’s failure to give such notice shall not affect the validity thereof.

     (b) If any Lender shall obtain payment of any principal of or interest on any Loan made
by it to the Borrower under this Agreement (or reimbursement as to any Letter of Credit)
through the exercise of any right of set-off, banker’s lien or counterclaim or similar right
or otherwise, and, as a result of such payment, such Lender shall have received a greater
portion of the principal or interest (or reimbursement) then due hereunder by the Borrower
to such Lender than the portion received by any other Lenders, it shall promptly (i) notify
the Administrative Agent and each other Lender thereof and (ii) purchase from such other
Lenders participations in (or, if and to the extent specified by such Lender, direct
interests in) the Loans (or participations in Letters of Credit) made by such other Lenders
(or in interest due thereon, as the case may be) in such amounts, and make such other
adjustments from time to time as shall be equitable, to the end that all the Lenders shall
share the benefit of such excess payment (net of any expenses which may be incurred by such
Lender in obtaining or preserving such excess payment) pro rata in accordance with the
unpaid principal and/or interest on the Loans held by each of the Lenders (or reimbursements
of Letters of Credit). To such end all the Lenders shall make appropriate adjustments among
themselves (by the resale of participations sold or otherwise) if such payment is rescinded
or must otherwise be restored. The Borrower agrees that any Lender so purchasing a
participation (or direct interest) in the Loans made by other Lenders (or in interest due
thereon, as the case may be) may exercise all rights of set-off, banker’s lien, counterclaim
or similar rights with respect to such participation as fully as if such Lender were a
direct holder of Loans (or Letters of Credit) in the amount of such participation. Nothing
contained herein shall require any Lender to exercise any such right or shall affect the
right of any Lender to exercise, and retain the benefits of exercising, any such right with
respect to any other indebtedness or obligation of the Borrower. If under any applicable
bankruptcy, insolvency or other similar law, any Lender receives a secured claim in lieu of
a set off to which this Section 4.05 applies, such Lender shall, to the extent practicable,
exercise its rights in respect of such secured claim in a manner consistent with the rights
of the Lenders entitled under this Section 4.05 to share the benefits of any recovery on
such secured claim.

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     Section 4.06 Taxes.

     (a) Payments Free and Clear. Any and all payments by the Borrower hereunder
shall be made, in accordance with Section 4.01, free and clear of and without deduction for
any and all present or future taxes, levies, imposts, deductions, charges or withholdings,
and all liabilities with respect thereto, excluding, in the case of each Lender, the
Issuing Bank and the Administrative Agent, taxes imposed on its income, and franchise or
similar taxes imposed on it, by (i) any jurisdiction (or political subdivision thereof) of
which the Administrative Agent, the Issuing Bank or such Lender, as the case may be, is a
citizen or resident or in which such Lender has an Applicable Lending Office, (ii) the
jurisdiction (or any political subdivision thereof) in which the Administrative Agent, the
Issuing Bank or such Lender is organized, or (iii) any jurisdiction (or political
subdivision thereof) in which such Lender, the Issuing Bank or the Administrative Agent is
presently doing business which taxes are imposed solely as a result of doing business in
such jurisdiction (all such non-excluded taxes, levies, imposts, deductions, charges,
withholdings and liabilities being hereinafter referred to as “Taxes”). If the
Borrower shall be required by law to deduct any Taxes from or in respect of any sum payable
hereunder to the Lenders, the Issuing Bank or the Administrative Agent (i) the sum payable
shall be increased by the amount necessary so that after making all required deductions
(including deductions applicable to additional sums payable under this Section 4.06) such
Lender, the Issuing Bank or the Administrative Agent (as the case may be) shall receive an
amount equal to the sum it would have received had no such deductions been made, (ii) the
Borrower shall make such deductions and (iii) the Borrower shall pay the full amount
deducted to the relevant taxing authority or other Governmental Authority in accordance with
applicable law.

     (b) Other Taxes. In addition, to the fullest extent permitted by applicable
law, the Borrower agrees to pay any present or future stamp or documentary taxes or any
other excise or property taxes, charges or similar levies that arise from any payment made
hereunder or from the execution, delivery or registration of, or otherwise with respect to,
this Agreement or any Security Instrument (hereinafter referred to as “Other
Taxes”).

     (c) Indemnification. To the fullest extent permitted by
applicable law, the Borrower will indemnify each Lender and the Issuing Bank and the
Administrative Agent for the full amount of Taxes and Other Taxes (including, but not
limited to, any Taxes or Other Taxes imposed by any Governmental Authority on amounts
payable under this section 4.06) paid by such Lender, the Issuing Bank or the Administrative
Agent (on their behalf or on behalf of any Lender), as the case may be, and any liability
(including penalties, interest and expenses) arising therefrom or with respect thereto,
whether or not such Taxes or Other Taxes were correctly or legally asserted unless the
payment of such Taxes was not correctly or legally asserted and such Lender’s payment of
such Taxes or Other Taxes was the result of its gross negligence or willful misconduct. Any
payment pursuant to such indemnification shall be made within thirty (30) days after the
date any Lender, the Issuing Bank or the Administrative Agent, as the case may be, makes
written demand therefor. If any Lender, 

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the Issuing Bank or the Administrative Agent receives a refund or credit in respect
of any Taxes or Other Taxes for which such Lender, Issuing Bank or the Administrative Agent
has received payment from the Borrower it shall promptly notify the Borrower of such refund
or credit and shall, if no default has occurred and is continuing, within thirty (30) days
after receipt of a request by the Borrower (or promptly upon receipt, if the Borrower has
requested application for such refund or credit pursuant hereto), pay an amount equal to
such refund or credit to the Borrower without interest (but with any interest so refunded or
credited), provided that the Borrower, upon the request of such Lender, the Issuing Bank or
the Administrative Agent, agrees to return such refund or credit (plus penalties, interest
or other charges) to such Lender or the Administrative Agent in the event such Lender or the
Administrative Agent is required to repay such refund or credit.

     (d) Lender Representations.

          (i) Each Lender represents that it is either (A) not a “foreign person” as such term is
defined in U.S. Treasury Regulations Section 1.1441-1(c)(2) or (B) it is entitled to
complete exemption from United States withholding tax imposed on or with respect to any
payments, including fees, to be made to it pursuant to this Agreement (1) under an
applicable provision of a tax convention to which the United States of America is a party or
(2) because it is acting through a branch, agency or office in the United States of America
and any payment to be received by it hereunder is effectively connected with a trade or
business in the United States of America. Each Lender that is a “foreign person” as such
term is defined in U.S. Treasury Regulations Section 1.441-1(c)(2) agrees to provide to the
Borrower and the Administrative Agent on the Closing Date, or on the date of its delivery of
the Assignment pursuant to which it becomes a Lender, and at such other times as required by
United States law or as the Borrower or the Administrative Agent shall reasonably request,
two accurate and complete original signed copies of either (y) Internal Revenue Service Form
W-8ECI (or successor form) certifying that all payments to be made to it hereunder will be
effectively connected to a United States trade or business (the “Form W-8ECI
Certification”) or (z) Internal Revenue Service Form W-8BEN (or successor form)
certifying that it is entitled to the benefit of a provision of a tax convention to which
the United States of America is a party which completely exempts from United States
withholding tax all payments to be made to it hereunder (the “Form W-8BEN
Certification”). In addition, each Lender agrees that if it previously filed a Form
W-8ECI Certification, it will deliver to the Borrower and the Administrative Agent a new
Form W-8ECI Certification prior to the first payment date occurring in each of its
subsequent taxable years; and if it previously filed a Form W-8BEN Certification, it will
deliver to the Borrower and the Administrative Agent a new certification prior to the first
payment date falling in the third year following the previous filing of such certification.
Each Lender also agrees to deliver to the Borrower and the Administrative Agent such other
or supplemental forms as may at any time be required as a result of changes in applicable
law or regulation in order to confirm or maintain in effect its entitlement to exemption
from United States withholding tax on any payments hereunder, provided that the
circumstances of such

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Lender at the relevant time and applicable laws permit it to do so. If a Lender
determines, as a result of any change in either (i) a Governmental Requirement or (ii) its
circumstances, that it is unable to submit any form or certificate that it is obligated to
submit pursuant to this Section 4.06, or that it is required to withdraw or cancel any such
form or certificate previously submitted, it shall promptly notify the Borrower and the
Administrative Agent of such fact. If a Lender is organized under the laws of a
jurisdiction outside the United States of America, unless the Borrower and the
Administrative Agent have received a Form W-8BEN Certification or Form W-8ECI Certification
satisfactory to them indicating that all payments to be made to such Lender hereunder are
not subject to United States withholding tax, the Borrower shall withhold taxes from such
payments at the applicable statutory rate. Each Lender agrees to indemnify and hold
harmless the Borrower or Administrative Agent, as applicable, from any United States taxes,
penalties, interest and other expenses, costs and losses incurred or payable by (i) the
Administrative Agent as a result of such Lender’s failure to submit any form or certificate
that it is required to provide pursuant to this Section 4.06 or (ii) the Borrower or the
Administrative Agent as a result of their reliance on any such form or certificate which
such Lender has provided to them pursuant to this Section 4.06.

     (ii) For any period with respect to which a Lender has failed to provide the Borrower
with the form required pursuant to this Section 4.06, if any, (other than if such failure is
due to a change in a Governmental Requirement occurring subsequent to the date on which a
form originally was required to be provided), such Lender shall not be entitled to
indemnification under Section 4.06 with respect to taxes imposed by the United States which
taxes would not have been imposed but for such failure to provide such forms;
provided, however, that if a Lender, which is otherwise exempt from or
subject to a reduced rate of withholding tax, becomes subject to taxes because of its
failure to deliver a form required hereunder, the Borrower shall take such steps as such
Lender shall reasonably request to assist such Lender to recover such taxes.

     (iii) Any Lender claiming any additional amounts payable pursuant to this Section 4.06
shall use reasonable efforts (consistent with legal and regulatory restrictions) to file any
certificate or document requested by the Borrower or the Administrative Agent or to change
the jurisdiction of its Applicable Lending Office or to contest any tax imposed if the
making of such a filing or change or contesting such tax would avoid the need for or reduce
the amount of any such additional amounts that may thereafter accrue and would not, in the
sole determination of such Lender, be otherwise disadvantageous to such Lender.

     Section 4.07 Disposition of Proceeds. Certain of the Security Instruments contain an
assignment by the Borrower and the Guarantors, as the case may be, unto and in favor of the Agent
for the benefit of the Lenders of all Hydrocarbon production and all proceeds attributable thereto
which may be produced from or allocated to the Mortgaged Oil and Gas Properties, and further
provides in general for the application of such proceeds to the satisfaction of the Obligations and
any other obligations described therein and secured thereby. Notwithstanding the assignment
contained in such Security Instruments, until the occurrence of an Event of Default, the Lenders
agree that they will neither notify the purchaser or purchasers of such production nor take any
other action to cause such proceeds to be remitted to the Lenders, but the

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Lenders will instead permit such proceeds to be paid to the Borrower and the Guarantors, as
the case may be.

ARTICLE V

Capital Adequacy and Yield Protection

     Section 5.01 Additional Costs.

     (a) LIBOR Regulations, etc. The Borrower shall pay directly to each Lender
from time to time such amounts as such Lender may determine to be necessary to compensate
such Lender for any costs which it determines are attributable to its making or maintaining
of any LIBOR Loans or issuing or participating in Letters of Credit hereunder or its
obligation to make any LIBOR Loans or issue or participate in any Letters of Credit
hereunder, or any reduction in any amount receivable by such Lender hereunder in respect of
any of such LIBOR Loans, Letters of Credit or such obligation (such increases in costs and
reductions in amounts receivable being herein called “Additional Costs”), resulting
from any Regulatory Change which: (i) changes the basis of taxation of any amounts payable
to such Lender under this Agreement or any Note in respect of any of such LIBOR Loans or
Letters of Credit (other than taxes imposed on the overall net income of such Lender or of
its Applicable Lending Office for any of such LIBOR Loans by the jurisdiction in which such
Lender has its principal office or Applicable Lending Office); or (ii) imposes or modifies
any reserve, special deposit, minimum capital, capital ratio or similar requirements
relating to any extensions of credit or other assets of, or any deposits with or other
liabilities of such Lender, or the Commitment or Loans of such Lender or the London
interbank market; or (iii) imposes any other condition affecting this Agreement or any Note
(or any of such extensions of credit or liabilities) or such Lender’s Commitment or Loans.
Each Lender will notify the Administrative Agent and the Borrower of any event occurring
after the Closing Date which will entitle such Lender to compensation pursuant to this
Section 5.01(a) as promptly as practicable after it obtains knowledge thereof and determines
to request such compensation, and will designate a different Applicable Lending Office for
the Loans of such Lender affected by such event if such designation will avoid the need for,
or reduce the amount of, such compensation and will not, in the sole opinion of such Lender,
be disadvantageous to such Lender, provided that such Lender shall have no obligation to so
designate an Applicable Lending Office located in the United States. If any Lender requests
compensation from the Borrower under this Section 5.01(a), the Borrower may, by notice to
such Lender, suspend the obligation of such Lender to make additional Loans of the Type with
respect to which such compensation is requested until the Regulatory Change giving rise to
such request ceases to be in effect (in which case the provisions of Section 5.04 shall be
applicable).

     (b) Regulatory Change. Without limiting the effect of the provisions of Section
5.01(a), in the event that at any time (by reason of any Regulatory Change or any other
circumstances arising after the Closing Date affecting (A) any Lender, (B) the London
interbank market or (C) such Lender’s position in such market), the LIBOR Rate, as
determined in good faith by such Lender, will not adequately and fairly reflect the cost

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to such Lender of funding its LIBOR Loans, then, if such Lender so elects, by notice to
the Borrower and the Administrative Agent, the obligation of such Lender to make additional
LIBOR Loans shall be suspended until such Regulatory Change or other circumstances ceases to
be in effect (in which case the provisions of Section 5.04 shall be applicable).

     (c) Capital Adequacy. Without limiting the effect of the foregoing provisions
of this Section 5.01 (but without duplication), the Borrower shall pay directly to any
Lender from time to time on request such amounts as such Lender may reasonably determine to
be necessary to compensate such Lender or its parent or holding company for any costs which
it determines are attributable to the maintenance by such Lender or its parent or holding
company (or any Applicable Lending Office), pursuant to any Governmental Requirement
following any Regulatory Change, of capital in respect of its Commitment, its Note, or its
Loans or any interest held by it in any Letter of Credit, such compensation to include,
without limitation, an amount equal to any reduction of the rate of return on assets or
equity of such Lender or its parent or holding company (or any Applicable Lending Office) to
a level below that which such Lender or its parent or holding company (or any Applicable
Lending Office) could have achieved but for such Governmental Requirement. Such Lender will
notify the Borrower that it is entitled to compensation pursuant to this Section 5.01(c) as
promptly as practicable after it determines to request such compensation.

     (d) Compensation Procedure. Any Lender notifying the Borrower of the
incurrence of Additional Costs under this Section 5.01 shall in such notice to the Borrower
and the Administrative Agent set forth in reasonable detail the basis and amount of its
request for compensation. Determinations and allocations by each Lender for purposes of
this Section 5.01 of the effect of any Regulatory Change pursuant to Section 5.01(a) or (b),
or of the effect of capital maintained pursuant to Section 5.01(c), on its costs or rate of
return of maintaining Loans or its obligation to make Loans or issue Letters of Credit, or
on amounts receivable by it in respect of Loans or Letters of Credit, and of the amounts
required to compensate such Lender under this Section 5.01, shall be conclusive and binding
for all purposes, provided that such determinations and allocations are made on a reasonable
basis. Any request for additional compensation under this Section 5.01 shall be paid by the
Borrower within thirty (30) days of the receipt by the Borrower of the notice described in
this Section 5.01(d).

     Section 5.02 Limitation on LIBOR Loans. Anything herein to the contrary
notwithstanding, if, on or prior to the determination of any LIBOR Rate for any Interest Period:

     (a) the Administrative Agent determines (which determination shall be conclusive,
absent manifest error) that quotations of interest rates for the relevant deposits referred
to in the definition of “LIBOR Rate” in Section 1.02 are not being provided in the relevant
amounts or for the relevant maturities for purposes of determining rates of interest for
LIBOR Loans as provided herein; or

     (b) the Administrative Agent determines (which determination shall be conclusive,
absent manifest error) that the relevant rates of interest referred to in the

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definition of “LIBOR Rate” in Section 1.02 upon the basis of which the rate of interest
for LIBOR Loans for such Interest Period is to be determined are not sufficient to
adequately cover the cost to the Lenders of making or maintaining LIBOR Loans;

then the Administrative Agent shall give the Borrower prompt notice thereof, and so long as such
condition remains in effect, the Lenders shall be under no obligation to make additional LIBOR
Loans.

     Section 5.03 Illegality. Notwithstanding any other provision of this Agreement, in
the event that it becomes unlawful for any Lender or its Applicable Lending Office to honor its
obligation to make or maintain LIBOR Loans hereunder, then such Lender shall promptly notify the
Borrower thereof and such Lender’s obligation to make LIBOR Loans shall be suspended until such
time as such Lender may again make and maintain LIBOR Loans (in which case the provisions of
Section 5.04 shall be applicable).

     Section 5.04 Base Rate Loans Pursuant to Sections 5.01, 5.02 and 5.03. If the
obligation of any Lender to make LIBOR Loans shall be suspended pursuant to Sections 5.01, 5.02 or
5.03 (“Affected Loans”), all Affected Loans which would otherwise be made by such Lender
shall be made instead as Base Rate Loans (and, if an event referred to in Section 5.01(b) or
Section 5.03 has occurred and such Lender so requests by notice to the Borrower, all Affected Loans
of such Lender then outstanding shall be automatically converted into Base Rate Loans on the date
specified by such Lender in such notice) and, to the extent that Affected Loans are so made as (or
converted into) Base Rate Loans, all payments of principal which would otherwise be applied to such
Lender’s Affected Loans shall be applied instead to its Base Rate Loans.

     Section 5.05 Compensation. The Borrower shall pay to each Lender within thirty (30)
days of receipt of written request of such Lender (which request shall set forth, in reasonable
detail, the basis for requesting such amounts and which shall be conclusive and binding for all
purposes provided that such determinations are made on a reasonable basis), such amount or amounts
as shall compensate it for any loss, cost, expense or liability which such Lender determines are
attributable to:

     (a) any payment, prepayment or conversion of a LIBOR Loan properly made by such Lender
or the Borrower for any reason (including, without limitation, the acceleration of the Loans
pursuant to Section 10.01) on a date other than the last day of the Interest Period for such
Loan; or

     (b) any failure by the Borrower for any reason (including but not limited to, the
failure of any of the conditions precedent specified in Article VI to be satisfied) to
borrow, continue or convert a LIBOR Loan from such Lender on the date for such borrowing,
continuation or conversion specified in the relevant notice given pursuant to Section
2.02(c).

     Without limiting the effect of the preceding sentence, such compensation shall include an amount
equal to the excess, if any, of (i) the amount of interest which would have accrued on the
principal amount so paid, prepaid or converted or not borrowed for the period from the date of such
payment, prepayment or conversion or failure to borrow to the last day of the Interest

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Period for such Loan (or, in the case of a failure to borrow, the Interest Period for such Loan
which would have commenced on the date specified for such borrowing) at the applicable rate of
interest for such Loan provided for herein over (ii) the interest component of the amount such
Lender would have bid in the London interbank market for Dollar deposits of leading banks in
amounts comparable to such principal amount and with maturities comparable to such period (as
reasonably determined by such Lender).

     Section 5.06 Time Limit; Etc.

     (a) Time Limited. Notwithstanding anything to the contrary contained in
Sections 5.01 through 5.05, the Borrower shall not be required to reimburse or pay any costs
or expenses to any Lender as required by such sections which have accrued more than 180 days
prior to such Lender’s giving notice to the Borrower that such Lender has suffered or
incurred such costs or expenses.

     (b) Non Discriminatory Basis. None of the Lenders shall be permitted to pass
through to the Borrower costs and expenses under Sections 5.01 through 5.05 which are not
also passed through by such Lender to other customers of such Lender similarly situated when
such customer is subject to documents containing similar provisions as those contained in
such Sections.

     Section 5.07 Replacement Lenders.

     (a) Terminated Lenders. If any Lender has notified the Borrower and the
Administrative Agent of its incurring Additional Costs under Section 5.01 or has required
the Borrower to make payments for Taxes under Section 4.06 or it is unable to make LIBOR
Loans under Section 5.03, then the Borrower may, unless such Lender has notified the
Borrower and the Administrative Agent that the circumstances giving rise to such notice no
longer apply, terminate, in whole but not in part, the Commitment of any Lender (other than
the Administrative Agent) (the “Terminated Lender”) at any time upon five (5)
Business Days’ prior written notice to the Terminated Lender and the Administrative Agent
(such notice referred to herein as a “Notice of Termination”).

     (b) Replacement Lenders. In order to effect the termination of the Commitment
of the Terminated Lender, the Borrower shall: (i) obtain an agreement with one or more
Lenders to increase their Commitment and/or (ii) request any one or more other banking
institutions to become parties to this Agreement in place and instead of such Terminated
Lender and agree to accept a Commitment; provided, however, that such one or
more other banking institutions are reasonably acceptable to the Administrative Agent and
become parties by executing an Assignment (the lenders or other banking institutions that
agree to accept in whole or in part the Commitment of the Terminated Lender being referred
to herein as the “Replacement Lenders”), such that the aggregate increased and/or
accepted Commitments of the Replacement Lenders under clauses (i) and (ii) above equal the
Commitment of the Terminated Lender.

     (c) Content of Notice of Termination. The Notice of Termination shall include
the name of the Terminated Lender, the date the termination will occur (the

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“Lender Termination Date”), and the Replacement Lender or Replacement Lenders
to which the Terminated Lender will assign its Commitment and, if there will be more than
one Replacement Lender, the portion of the Terminated Lender’s Commitment to be assigned to
each Replacement Lender.

     (d) Effecting Termination. On the Lender Termination Date, (i) the Terminated
Lender shall by execution and delivery of an Assignment assign its Commitment to the
Replacement Lender or Replacement Lenders (pro rata, if there is more than one Replacement
Lender, in proportion to the portion of the Terminated Lender’s Commitment to be assigned to
each Replacement Lender) indicated in the Notice of Termination and shall assign to the
Replacement Lender or Replacement Lenders each of its Loans (if any) then outstanding and
participation interests in Letters of Credit (if any) then outstanding pro rata as
aforesaid), (ii) the Terminated Lender shall endorse its Note, payable without recourse,
representation or warranty to the order of the Replacement Lender or Replacement Lenders
(pro rata as aforesaid), (iii) the Replacement Lender or Replacement Lenders shall purchase
the Note held by the Terminated Lender (pro rata as aforesaid) at a price equal to the
unpaid principal amount thereof plus interest and facility and other fees accrued and unpaid
to the Lender Termination Date, and (iv) the Replacement Lender or Replacement Lenders will
thereupon (pro rata as aforesaid) succeed to and be substituted in all respects for the
Terminated Lender with like effect as if becoming a Lender pursuant to the terms of Section
12.06(b), and the Terminated Lender will have the rights and benefits of an assignor under
Section 12.06(b). To the extent not in conflict, the terms of Section 12.06(b) shall
supplement the provisions of this Section 5.06(d). For each assignment made under this
Section 5.06, the Replacement Lender shall pay to the Administrative Agent the processing
fee provided for in Section 12.06(b). The Borrower will be responsible for the payment of
any breakage costs associated with termination and Replacement Lenders, as set forth in
Section 5.05.

ARTICLE VI

Conditions Precedent

     Section 6.01 Conditions Precedent to Effectiveness of this Agreement. The
effectiveness of this Agreement is subject to the conditions precedent that the Administrative
Agent shall have received on or before such date all fees due and payable pursuant to Section 2.04
and the receipt by the Administrative Agent of the following documents (in sufficient original
counterparts, other than the Notes, for each Lender) and satisfaction of the other conditions
provided in this Section 6.01, each of which shall be satisfactory to the Administrative Agent in
form and substance:

     (a) A certificate of the Secretary or an Assistant Secretary of the Borrower setting
forth (i) resolutions of its board of directors with respect to the authorization of the
Borrower to execute and deliver the Loan Documents to which it is a party and to enter into
the transactions contemplated in those documents, (ii) the officers of the Borrower (y) who
are authorized to sign the Loan Documents to which Borrower is a party and (z) who will,
until replaced by another officer or officers duly authorized for

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that purpose, act as its representative for the purposes of signing documents and
giving notices and other communications in connection with this Agreement and the
transactions contemplated hereby, (iii) specimen signatures of the authorized officers, and
(iv) the articles or certificate of incorporation and bylaws of the Borrower, certified as
being true and complete. The Administrative Agent and the Lenders may conclusively rely on
such certificate until the Administrative Agent receives notice in writing from the Borrower
to the contrary.

     (b) A certificate of the Secretary or an Assistant Secretary of each of the Guarantors
(other than Callon Mineral Properties, Inc.) setting forth (i) resolutions of its board of
directors with respect to the authorization of such Guarantor to execute and deliver the
Loan Documents to which it is a party and to enter into the transactions contemplated in
those documents, (ii) the officers of such Guarantor (y) who are authorized to sign the Loan
Documents to which such Guarantor is a party and (z) who will, until replaced by another
officer or officers duly authorized for that purpose, act as its representative for the
purposes of signing documents and giving notices and other communications in connection with
this Agreement and the transactions contemplated hereby, (iii) specimen signatures of the
authorized officers, and (iv) the articles or certificate of incorporation and bylaws of
such Guarantor, certified as being true and complete. The Administrative Agent and the
Lenders may conclusively rely on such certificate until they receive notice in writing from
such Guarantor to the contrary.

     (c) Certificates of the appropriate state agencies with respect to the existence,
qualification and good standing of the Borrower and each of the Guarantors (other than
Callon Mineral Properties, Inc.).

     (d) The Notes, duly completed and executed.

     (e) The Security Instruments described on Exhibit D, duly completed and
executed in sufficient number of counterparts for recording, if necessary.

     (f) An opinion of Haynes and Boone, LLP, counsel to the Borrower and the Guarantors
(other than Callon Mineral Properties, Inc.), in form and substance satisfactory to the
Administrative Agent and its counsel, as to such matters incident to the transactions herein
contemplated as the Administrative Agent and its counsel may reasonably request. An opinion
of Simon, Peragrine, Smith & Redfearn, L.L.P., Louisiana counsel satisfactory to the
Administrative Agent and its counsel, in form and substance satisfactory to the
Administrative Agent and its counsel, as to such matters incident to the transactions herein
contemplated as the Administrative Agent and its counsel may reasonably request including,
without limitation, opinions that all mortgage taxes have been properly paid.

     (g) A certificate of insurance coverage of the Borrower evidencing that the Borrower is
carrying insurance in accordance with Section 7.19.

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     (h) Title information satisfactory to the Administrative Agent setting forth a status
of title acceptable to the Administrative Agent to at least 75% of the value of the Oil and
Gas Properties included in the Initial Reserve Report.

     (i) Appropriate UCC search certificates reflecting no prior Liens other than those
permitted pursuant to Section 9.02.

     (j) Environmental assessment reports relating to the Oil and Gas Properties of the
Borrower and the Subsidiaries as may be requested by the Administrative Agent, including
environmental audits, phase I reports or other environmental reports of any nature
whatsoever (whether prepared internally or by third party consultants); and the
Administrative Agent must be satisfied with the results of the review of such reports and
environmental condition of such Oil and Gas Properties.

     (k) Letters in lieu, in form and substance satisfactory to the Administrative Agent,
executed by the Borrower and each Subsidiary, as appropriate, to each of the purchasers of
the Hydrocarbons of the Borrower and each such Guarantor produced from the Borrower’s and
such Guarantors’ Mortgaged Oil and Gas Properties, as may be requested by the Administrative
Agent.

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

     Section 6.02 Initial and Subsequent Loans and Letters of Credit. The obligation of
the Lenders to make Loans to the Borrower upon the occasion of each borrowing hereunder and to
issue, renew, extend or reissue Letters of Credit for the account of the Borrower (including the
Initial Funding and the deemed issuance of the Existing Letters of Credit) is subject to the
further conditions precedent that, as of the date of such Loans and after giving effect thereto:

     (a) no Default shall exist;

     (b) no Material Adverse Effect shall have occurred; and

     (c) the representations and warranties made by the Borrower in Article VII and in the
Security Instruments shall be true on and as of the date of the making of such Loans or
issuance, renewal, extension or reissuance of a Letter of Credit with the same force and
effect as if made on and as of such date and following such new borrowing, except to the
extent such representations and warranties are expressly limited to an earlier date or the
Majority Lenders may expressly consent in writing to the contrary.

     Each request for a borrowing or issuance, renewal, extension or reissuance of a Letter of
Credit by the Borrower hereunder shall constitute a certification by the Borrower to the effect set
forth in Section 6.02(c) (both as of the date of such notice and, unless the Borrower otherwise
notifies the Administrative Agent prior to the date of and immediately following such borrowing or
issuance, renewal, extension or reissuance of a Letter of Credit as of the date thereof).

     Section 6.03 Conditions Precedent for the Benefit of Lenders. All conditions
precedent to the obligations of the Lenders to make any Loan or the Issuing Bank to issue, renew or
extend

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any Letter of Credit are imposed hereby solely for the benefit of the Lenders and the Issuing
Bank, and no other Person may require satisfaction of any such condition precedent or be entitled
to assume that the Lenders will refuse to make any Loan or the Issuing Bank to issue, renew or
extend any Letter of Credit in the absence of strict compliance with such conditions precedent.

     Section 6.04 No Waiver. No waiver of any condition precedent shall preclude the
Administrative Agent or the Lenders from requiring such condition to be met prior to making any
subsequent Loan or preclude the Lenders from thereafter declaring that the failure of the Borrower
to satisfy such condition precedent constitutes a Default.

ARTICLE VII

Representations and Warranties

     The Borrower represents and warrants to the Administrative Agent and the Lenders that (each
representation and warranty herein is given as of the Closing Date and shall be deemed repeated and
reaffirmed on the dates of each borrowing and issuance, renewal, extension or reissuance of a
Letter of Credit as provided in Section 6.02):

     Section 7.01 Corporate Existence. Each of the Borrower and each Guarantor: (i) is a
corporation duly organized, legally existing and in good standing under the laws of the
jurisdiction of its incorporation; (ii) has all requisite corporate power, and has all material
governmental licenses, authorizations, consents and approvals necessary to own its assets and carry
on its business as now being or as proposed to be conducted; and (iii) is qualified to do business
in all jurisdictions in which the nature of the business conducted by it makes such qualification
necessary and where failure so to qualify would have a Material Adverse Effect.

     Section 7.02 Financial Condition. The audited consolidated balance sheet of the
Borrower and its Consolidated Subsidiaries as at December 31, 2005 and the related consolidated
statement of income, stockholders’ equity and cash flow of the Borrower and its Consolidated
Subsidiaries for the fiscal year ended on said date, with the opinion thereon of Ernst & Young LLP
heretofore furnished to the Administrative Agent and the unaudited consolidated balance sheet of
the Borrower and its Consolidated Subsidiaries as at March 31, 2006 and their related consolidated
statements of income, stockholders’ equity and cash flow of the Borrower and its Consolidated
Subsidiaries for the three month period ended on such date heretofore furnished to the
Administrative Agent, are complete and correct in all material respects and fairly present the
consolidated financial condition of the Borrower and its Consolidated Subsidiaries as at said dates
and the results of its operations for the fiscal year and the three month period ending on said
dates, all in accordance with GAAP, as applied on a consistent basis (subject, in the case of the
interim financial statements, to normal year-end adjustments). Neither the Borrower nor any
Subsidiary has on the Closing Date any material Debt, contingent liabilities, liabilities for
taxes, unusual forward or long-term commitments or unrealized or anticipated losses from any
unfavorable commitments, except as referred to or reflected or provided for in the Financial
Statements or in Schedule 7.02. As of the Closing Date, since December 31, 2005, there has
been no change or event having a Material Adverse Effect.

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     Section 7.03 Litigation. Except as disclosed to the Lenders in Schedule 7.03
hereto, at the Closing Date there is no litigation, legal, administrative or arbitral proceeding,
investigation or other action of any nature pending or, to the knowledge of the Borrower threatened
against or affecting the Borrower or any Subsidiary which involves the possibility of any judgment
or liability against the Borrower or any Subsidiary not fully covered by insurance (except for
normal deductibles).

     Section 7.04 No Breach. Neither the execution and delivery of the Loan Documents, nor
compliance with the terms and provisions hereof will conflict with or result in a breach of, or
require any consent which has not been obtained as of the Closing Date under, the respective
charter or by laws of the Borrower or any Subsidiary, or any Governmental Requirement or any
agreement or instrument to which the Borrower or any Subsidiary is a party or by which it is bound
or to which it or its Properties are subject, or constitute a default under any such agreement or
instrument, or result in the creation or imposition of any Lien upon any of the revenues or assets
of the Borrower or any Subsidiary pursuant to the terms of any such agreement or instrument other
than the Liens created by the Loan Documents.

     Section 7.05 Authority. The Borrower and each Guarantor have all necessary corporate
power and authority to execute, deliver and perform its obligations under the Loan Documents to
which it is a party; and the execution, delivery and performance by the Borrower and each Guarantor
of the Loan Documents to which it is a party, have been duly authorized by all necessary corporate
action on its part; and the Loan Documents constitute the legal, valid and binding obligations of
the Borrower and each Guarantor, enforceable in accordance with their terms.

     Section 7.06 Approvals. No authorizations, approvals or consents of, and no filings
or registrations with, any Governmental Authority are necessary for the execution, delivery or
performance by the Borrower or any Guarantor of the Loan Documents or for the validity or
enforceability thereof, except for the recording and filing of the Security Instruments as required
by this Agreement.

     Section 7.07 Use of Loans. The proceeds of the Loans shall be used for (i) the
acquisition of Oil and Gas Properties, (ii) exploration and development of Oil and Gas Properties,
(iii) working capital, (iv) to refinance Debt under the Prior Credit Agreement, (v) to repurchase,
redeem or repay Existing Other Debt or Subordinated Debt to the extent otherwise permitted under
this Agreement and (vi) general corporate purposes. None of the Guarantors or the Borrower 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 T, U or X of the Board of Governors of the Federal Reserve System) and no
part of the proceeds of any Loan hereunder will be used to buy or carry any margin stock.

     Section 7.08 ERISA.

     (a) The Borrower, each Subsidiary and each ERISA Affiliate have complied in all
material respects with ERISA and, where applicable, the Code regarding each Plan.

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     (b) Each Plan is, and has been, maintained in substantial compliance with ERISA and,
where applicable, the Code.

     (c) No act, omission or transaction has occurred which could result in imposition on
the Borrower, any Subsidiary or any ERISA Affiliate (whether directly or indirectly) of (i)
either a civil penalty assessed pursuant to section 502(c), (i) or (l) of ERISA or a tax
imposed pursuant to Chapter 43 of Subtitle D of the Code or (ii) breach of fiduciary duty
liability damages under section 409 of ERISA.

     (d) No Plan (other than a defined contribution plan) or any trust created under any
such Plan has been terminated since September 2, 1974. No liability to the PBGC (other than
for the payment of current premiums which are not past due) by the Borrower, any Subsidiary
or any ERISA Affiliate has been or is expected by the Borrower, any Subsidiary or any ERISA
Affiliate to be incurred with respect to any Plan. No ERISA Event with respect to any Plan
has occurred.

     (e) Full payment when due has been made of all amounts which the Borrower, any
Subsidiary or any ERISA Affiliate is required under the terms of each Plan or applicable law
to have paid as contributions to such Plan, and no accumulated funding deficiency (as
defined in section 302 of ERISA and section 412 of the Code), whether or not waived, exists
with respect to any Plan.

     (f) The actuarial present value of the benefit liabilities under each Plan which is
subject to Title IV of ERISA does not, as of the end of the Borrower’s most recently ended
fiscal year, exceed the current value of the assets (computed on a plan termination basis in
accordance with Title IV of ERISA) of such Plan allocable to such benefit liabilities. The
term “actuarial present value of the benefit liabilities” shall have the meaning specified
in section 4041 of ERISA.

     (g) None of the Borrower, any Subsidiary or any ERISA Affiliate sponsors, maintains, or
contributes to an employee welfare benefit plan, as defined in section 3(1) of ERISA,
including, without limitation, any such plan maintained to provide benefits to former
employees of such entities, that may not be terminated by the Borrower, a Subsidiary or any
ERISA Affiliate in its sole discretion at any time without any material liability.

     (h) None of the Borrower, any Subsidiary or any ERISA Affiliate sponsors, maintains or
contributes to, or has at any time in the preceding six calendar years, sponsored,
maintained or contributed to, any Multiemployer Plan.

     (i) None of the Borrower, any Subsidiary or any ERISA Affiliate is required to provide
security under section 401(a)(29) of the Code due to a Plan amendment that result in an
increase in current liability for the Plan.

     Section 7.09 Taxes. Except as set out in Schedule 7.09, each of the Borrower
and its Subsidiaries has filed all United States Federal income tax returns and all other tax
returns which are required to be filed by them and have paid all material taxes due pursuant to
such returns or pursuant to any assessment received by the Borrower or any Subsidiary. The
charges, accruals

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and reserves on the books of the Borrower and its Subsidiaries in respect of taxes and other
governmental charges are, in the opinion of the Borrower, adequate. No tax lien has been filed
and, to the knowledge of the Borrower, no claim is being asserted with respect to any such tax, fee
or other charge.

     Section 7.10 Titles, Etc.

     (a) Except as set out in Schedule 7.10, each of the Borrower and the Guarantors
has good and defensible title to its material (individually or in the aggregate) Properties
(other than the Entrada Assets), free and clear of all Liens, except Liens permitted by
Section 9.02. Except as set forth in Schedule 7.10, after giving full effect to the
Excepted Liens, the Borrower owns at least the net interests in production attributable to
the Hydrocarbon Interests reflected in the most recently delivered Reserve Report and the
ownership of such Properties does not in any material respect obligate the Borrower to bear
the costs and expenses relating to the maintenance, development and operations of each such
Property in an amount in excess of the working interest of each Property set forth in the
most recently delivered Reserve Report without a corresponding increase in net revenue
interest for such Properties. All information contained in the most recently delivered
Reserve Report is true and correct in all material respects as of the date thereof.

     (b) All material leases and agreements necessary for the conduct of the business of the
Borrower and the Guarantors are valid and subsisting, in full force and effect and there
exists no default or event or circumstance which with the giving of notice or the passage of
time or both would give rise to a default under any such lease or agreement, which would
affect in any material respect the conduct of the business of the Borrower and the
Guarantors.

     (c) The rights, Properties and other assets presently owned, leased or licensed by the
Borrower and the Guarantors including, without limitation, all easements and rights of way,
include all rights, Properties and other assets reasonably necessary to permit the Borrower
and the Guarantors to conduct their business in all material respects in the same manner as
its business has been conducted prior to the Closing Date.

     (d) All of the assets and Properties of the Borrower and the Guarantors which are
reasonably necessary for the operation of its business are in good working condition and are
maintained in accordance with customary industry standards.

     Section 7.11 No Material Misstatements. No written information, statement, exhibit,
certificate, document or report furnished to the Administrative Agent and the Lenders (or any of
them) by the Borrower or any Subsidiary in connection with the negotiation of this Agreement
contained any material misstatement of fact or omitted to state a material fact or any fact
necessary to make the statement contained therein not materially misleading in the light of the
circumstances in which made and with respect to the Borrower and its Subsidiaries taken as a whole.
There is no fact peculiar to the Borrower or any Subsidiary which has a Material Adverse Effect or
in the future is reasonably likely to have (so far as the Borrower can now foresee) a Material
Adverse Effect and which has not been disclosed in writing to the Administrative Agent

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and the Lenders by or on behalf of the Borrower or any Subsidiary prior to, or on, the Closing
Date in connection with the transactions contemplated hereby.

     Section 7.12 Investment Company Act. Neither the Borrower nor any Subsidiary is an
“investment company” or a company “controlled” by an “investment company,” within the meaning of
the Investment Company Act of 1940, as amended.

     Section 7.13 [Reserved].

     Section 7.14 Subsidiaries. Except as set forth on Schedule 7.14, as of the
Closing Date the Borrower has no Subsidiaries.

     Section 7.15 Location of Business, Offices and Inventory. The Borrower’s principal
place of business and chief executive offices are located at the address stated on the signature
page of this Agreement. The principal place of business and chief executive office of each
Subsidiary are located at the addresses stated on Schedule 7.14. Schedule 7.14
sets forth as of the Closing Date each of the locations where the Borrower and its Subsidiaries
conducts business or maintains inventory and indicates whether the Borrower or the applicable
Subsidiary is qualified to do business in that jurisdiction.

     Section 7.16 Defaults. Neither the Borrower nor any Subsidiary is in default nor has
any event or circumstance occurred which, but for the expiration of any applicable grace period or
the giving of notice, or both, would constitute a default under any material agreement or
instrument to which the Borrower or any Subsidiary is a party or by which the Borrower or any
Subsidiary is bound which default would have a Material Adverse Effect. No Default hereunder has
occurred and is continuing.

     Section 7.17 Environmental Matters. Except (i) as provided in Schedule 7.17
or (ii) as would not have a Material Adverse Effect (or with respect to (c), (d) and (e) below,
where the failure to take such actions would not have a Material Adverse Effect):

     (a) Neither any Property of the Borrower or any Subsidiary nor the operations conducted
thereon violate any order or requirement of any court or Governmental Authority or any
Environmental Laws;

     (b) Without limitation of clause (a) above, no Property of the Borrower or any
Subsidiary nor the operations currently conducted thereon or, to the best knowledge of the
Borrower, by any prior owner or operator of such Property or operation, are in violation of
or subject to any existing, pending or threatened action, suit, investigation, inquiry or
proceeding by or before any court or Governmental Authority or to any remedial obligations
under Environmental Laws;

     (c) All notices, permits, licenses or similar authorizations, if any, required to be
obtained or filed in connection with the operation or use of any and all Property of the
Borrower and each Subsidiary, including without limitation past or present treatment,
storage, disposal or release of a hazardous substance or solid waste into the environment,
have been duly obtained or filed, and the Borrower and each Subsidiary are in

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compliance with the terms and conditions of all such notices, permits, licenses and
similar authorizations;

     (d) All hazardous substances, solid waste, and oil and gas exploration and production
wastes, if any, generated at any and all Property of the Borrower or any Subsidiary have in
the past been transported, treated and disposed of in accordance with Environmental Laws and
so as not to pose an imminent and substantial endangerment to public health or welfare or
the environment, and, to the best knowledge of the Borrower, all such transport carriers and
treatment and disposal facilities have been and are operating in compliance with
Environmental Laws and so as not to pose an imminent and substantial endangerment to public
health or welfare or the environment, and are not the subject of any existing, pending or
threatened action, investigation or inquiry by any Governmental Authority in connection with
any Environmental Laws;

     (e) The Borrower has taken all steps reasonably necessary to determine and has
determined that no hazardous substances, solid waste, or oil and gas exploration and
production wastes, have been disposed of or otherwise released and there has been no
threatened release of any hazardous substances on or to any Property of the Borrower or any
Subsidiary except in compliance with Environmental Laws and so as not to pose an imminent
and substantial endangerment to public health or welfare or the environment;

     (f) To the extent applicable, all Property of the Borrower and each Subsidiary
currently satisfies all design, operation, and equipment requirements imposed by the OPA or
scheduled as of the Closing Date to be imposed by OPA during the term of this Agreement, and
the Borrower does not have any reason to believe that such Property, to the extent subject
to OPA, will not be able to maintain compliance with the OPA requirements during the term of
this Agreement; and

     (g) Neither the Borrower nor any Subsidiary has any known contingent liability in
connection with any release or threatened release of any oil, hazardous substance or solid
waste into the environment.

     Section 7.18 Compliance with the Law. Neither the Borrower nor any Subsidiary has
violated any Governmental Requirement or failed to obtain any license, permit, franchise or other
governmental authorization necessary for the ownership of any of its Properties or the conduct of
its business, which violation or failure would have (in the event such violation or failure were
asserted by any Person through appropriate action) a Material Adverse Effect. Except for such acts
or failures to act as would not have a Material Adverse Effect, the Oil and Gas Properties (and
properties unitized therewith) have been maintained, operated and developed in a good and
workmanlike manner and in conformity with all applicable laws and all rules, regulations and orders
of all duly constituted authorities having jurisdiction and in conformity with the provisions of
all leases, subleases or other contracts comprising a part of the Hydrocarbon Interests and other
contracts and agreements forming a part of the Oil and Gas Properties; specifically in this
connection, (i) after the Closing Date, no Oil and Gas Property is subject to having allowable
production reduced below the full and regular allowable (including the maximum permissible
tolerance) because of any overproduction (whether or not the same was permissible at the time)
prior to the Closing Date and (ii) none of the wells comprising a part

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of the Oil and Gas Properties (or properties unitized therewith) are deviated from the
vertical more than the maximum permitted by applicable laws, regulations, rules and orders, and
such wells are, in fact, bottomed under and are producing from, and the well bores are wholly
within, the Oil and Gas Properties (or in the case of wells located on properties unitized
therewith, such unitized properties).

     Section 7.19 Insurance. Schedule 7.19 attached hereto contains an accurate
and complete description of all material policies of fire, liability, workmen’s compensation and
other forms of insurance owned or held by the Borrower and each Subsidiary. All such policies are
in full force and effect, all premiums with respect thereto covering all periods up to and
including the date of the closing have been paid, and no notice of cancellation or termination has
been received with respect to any such policy. Such policies are sufficient for compliance with
all requirements of law and of all material agreements to which the Borrower or any Subsidiary is a
party; are valid, outstanding and enforceable policies; provide adequate insurance coverage in at
least such amounts and against at least such risks (but including in any event public liability) as
are customarily insured against in the same general area by companies engaged in the same or a
similar business for the assets and operations of the Borrower and each Subsidiary; will remain in
full force and effect through the respective dates set forth in Schedule 7.19 without the
payment of additional premiums; and will not in any way be affected by, or terminate or lapse by
reason of, the transactions contemplated by this Agreement. Schedule 7.19 identifies all
material risks, if any, which the Borrower and its Subsidiaries and their respective Board of
Directors or officers have designated as being self insured. Neither the Borrower nor any
Subsidiary has been refused any insurance with respect to its assets or operations, nor has its
coverage been limited below usual and customary policy limits, by an insurance carrier to which it
has applied for any such insurance or with which it has carried insurance during the last three
years.

     Section 7.20 Hedging Agreements. Schedule 7.20 sets forth, as of the Closing
Date, a true and complete list of all Hedging Agreements (including commodity price swap
agreements, forward agreements (for terms in excess of thirty days) or contracts of sale which
provide for prepayment for deferred shipment or delivery of oil, gas or other commodities) of the
Borrower and each Subsidiary, the material terms thereof (including the type, term, effective date,
termination date and notional amounts or volumes), the net mark to market value thereof, all credit
support agreements relating thereto (including any margin required or supplied), and the counter
party to each such agreement.

     Section 7.21 Restriction on Liens. Neither the Borrower nor any of the Guarantors is
a party to any agreement or arrangement (other than this Agreement, the Security Instruments and
the agreements and instruments governing the Existing Other Debt), or subject to any order,
judgment, writ or decree, which either restricts or purports to restrict its ability to grant Liens
to other Persons on or in respect of their respective assets or Properties.

     Section 7.22 Material Agreements. Set forth on Schedule 7.22 hereto is a
complete and correct list of all material agreements, leases, indentures, purchase agreements,
obligations in respect of letters of credit, guarantees, joint venture agreements, and other
instruments in effect or to be in effect as of the Closing Date (other than Hedging Agreements and
agreements relating to Debt of the type described in clause (iii) in the definition of Debt or
clause (vii) in the definition of Debt to the extent relating to primary obligations of the type
described in clause (iii)

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in the definition of Debt) providing for, evidencing, securing or otherwise relating to any
Debt of the Borrower or any of its Subsidiaries, and all obligations of the Borrower or any of its
Subsidiaries to issuers of surety or appeal bonds issued for account of the Borrower or any such
Subsidiary, and such list correctly sets forth the names of the debtor or lessee and creditor or
lessor with respect to the Debt or lease obligations outstanding or to be outstanding and the
Property subject to any Lien securing such Debt or lease obligation. The Borrower has heretofore
delivered to the Administrative Agent a complete and correct copy of all such material credit
agreements, indentures, purchase agreements, contracts, letters of credit, guarantees, joint
venture agreements, or other instruments, including any modifications or supplements thereto, as in
effect on the Closing Date, which the Administrative Agent has requested.

ARTICLE VIII

Affirmative Covenants

     The Borrower covenants and agrees that, so long as any of the Commitments are in effect and
until payment in full of all Loans hereunder, all interest thereon and all other amounts payable by
the Borrower hereunder:

     Section 8.01 Reporting Requirements. The Borrower shall deliver, or shall cause to be
delivered, to the Administrative Agent with sufficient copies of each for the Lenders:

     (a) Annual Financial Statements. As soon as available and in any event within
90 days after the end of each fiscal year of the Borrower, the audited consolidated
statement of income, stockholders’ equity, changes in financial position and cash flows of
the Borrower and its Consolidated Subsidiaries for such fiscal year, and the related
consolidated balance sheet of the Borrower and its Consolidated Subsidiaries as at the end
of such fiscal year, and setting forth in each case in comparative form the corresponding
figures for the preceding fiscal year, and accompanied by the related opinion of independent
public accountants of recognized national standing reasonably acceptable to the
Administrative Agent which opinion shall state that said financial statements fairly present
the consolidated and consolidating financial condition and results of operations of the
Borrower and its Consolidated Subsidiaries as at the end of, and for, such fiscal year and
that such financial statements have been prepared in accordance with GAAP, except for such
changes in such principles with which the independent public accountants shall have
concurred and such opinion shall not contain a “going concern” or like qualification or
exception, and a certificate of such accountants stating that, in making the examination
necessary for their opinion, they obtained no knowledge, except as specifically stated, of
any Default.

     (b) Quarterly Financial Statements. As soon as available and in any event
within 45 days after the end of each of the first three fiscal quarterly periods of each
fiscal year of the Borrower, consolidated statements of income, changes in financial
position and cash flows of the Borrower and its Consolidated Subsidiaries for such period
and for the period from the beginning of the respective fiscal year to the end of such
period, and the related balance sheet as at the end of such period, and setting forth in
each case in comparative form the corresponding figures for the corresponding period in the

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preceding fiscal year, accompanied by the certificate of a Responsible Officer, which
certificate shall state that said financial statements fairly present the consolidated
financial condition and results of operations of the Borrower and its Consolidated
Subsidiaries in accordance with GAAP, as at the end of, and for, such period (subject to
normal year-end audit adjustments).

     (c) Notice of Default, Etc. Promptly after the Borrower knows that any Default
or any Material Adverse Effect has occurred, a notice of such Default or Material Adverse
Effect, describing the same in reasonable detail and the action the Borrower proposes to
take with respect thereto.

     (d) Other Accounting Reports. Promptly upon receipt thereof, a copy of each
other material report or letter submitted to the Borrower or any Subsidiary by independent
accountants in connection with any annual, interim or special audit made by them of the
books of the Borrower and its Subsidiaries, and a copy of any response by the Borrower or
any Subsidiary of the Borrower, or the Board of Directors of the Borrower or any Subsidiary
of the Borrower, to such letter or report.

     (e) SEC Filings, Etc. Promptly upon its becoming available, each financial
statement, report, notice or proxy statement sent by the Borrower to stockholders generally
and each regular or periodic report and any registration statement, prospectus or material
written communication (other than transmittal letters) in respect thereof filed by the
Borrower with or received by the Borrower in connection therewith from any securities
exchange or the SEC or any successor agency.

     (f) Notices Under Other Loan Agreements. Promptly after the furnishing
thereof, copies of any statement, report or notice furnished to any Person pursuant to the
terms of any indenture, loan or credit or other similar agreement, other than this Agreement
and not otherwise required to be furnished to the Lenders pursuant to any other provision of
this Section 8.01.

     (g) Other Matters. From time to time such other information regarding the
business, affairs or financial condition of the Borrower or any Subsidiary (including,
without limitation, any Plan or Multiemployer Plan, any reports or other information
required to be filed under ERISA), and any operating reports with respect to the operation
of Oil and Gas Properties as any Lender or the Administrative Agent may reasonably request.

     (h) Hedging Agreements. As soon as available and in any event within forty
five days after the last day of each calendar quarter, a report, in form and substance
satisfactory to the Administrative Agent, setting forth as of the last Business Day of such
calendar quarter a true and complete list of all Hedging Agreements (including commodity
price swap agreements, forward agreements with terms in excess of thirty days or contracts
of sale which provide for prepayment for deferred shipment or delivery of oil, gas or other
commodities) of the Borrower and each Subsidiary, the material terms thereof (including the
type, term, effective date, termination date and notional amounts or volumes), the net mark
to market value therefor, any new credit support agreements

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relating thereto not listed on Schedule 7.20, any margin required or supplied
under any credit support document, and the counter party to each such agreement.

     (i) Monthly Reports. As soon as available and in any event within 45 days
after the end of each month, a report in form and substance satisfactory to the
Administrative Agent prepared by the Borrower for each of its Borrowing Base Properties
detailing for such month production, revenue, expense, production taxes and price
information;

     (j) Annual Projected Budget. At the time it furnishes each set of financial
statements pursuant to paragraph (a) above, an annual operating budget for the Borrower and
its Subsidiaries in form and substance reasonably acceptable to the Administrative Agent,
which budget shall include revenues, expenses and capital expenditures (detailing the
projected capital expenditures with respect to drilling (both development and exploration),
leasehold, geological and geophysical, capitalized general and administrative expenses, and
capitalized interest) for the following fiscal year.

     (k) Sales and Leasebacks. Prompt written notice if the Borrower or any
Subsidiary enters into any arrangement permitted by Section 9.05.

     Future Subsidiaries. (i) Prompt written notice if the Borrower or any
Subsidiary forms any new Subsidiary that is not a Guarantor under this Agreement and (ii) a
quarterly summary (due on the same days that quarterly financial statements are required to
be delivered pursuant to Section 8.01(b) above) of any changes in loans, advances or
investments by the Borrower or any Guarantor in or to any Subsidiary that is not a Guarantor
under this Agreement.

The Borrower will furnish to the Administrative Agent, at the time it furnishes each set of
financial statements pursuant to paragraph (a) or (b) above, a certificate substantially in the
form of Exhibit C executed by a Responsible Officer (i) certifying as to the matters set
forth therein and stating that no Default has occurred and is continuing (or, if any Default has
occurred and is continuing, describing the same in reasonable detail), and (ii) setting forth in
reasonable detail the computations necessary to determine whether the Borrower is in compliance
with Sections 9.12, 9.13 and 9.14 as of the end of the respective fiscal quarter or fiscal year.

     Section 8.02 Litigation. The Borrower shall promptly give to the Administrative Agent
notice of: (i) all legal or arbitral proceedings, and of all proceedings before any Governmental
Authority affecting the Borrower or any Subsidiary, except proceedings which, if adversely
determined, could not reasonably be expected to have a Material Adverse Effect, and (ii) of any
litigation or proceeding against or adversely affecting in any material respect the Borrower or any
Subsidiary in which the amount involved is not covered in full by insurance (subject to normal and
customary deductibles and for which the insurer has not assumed the defense) or injunctive or
similar relief is sought. The Borrower will, and will cause each of its Subsidiaries to, promptly
notify the Administrative Agent and each of the Lenders of any claim, judgment, Lien (other than
those permitted under Section 9.02) or other encumbrance affecting any Borrowing Base Property of
the Borrower or any Subsidiary if the value of the claim, judgment, Lien, or other encumbrance
affecting such Borrowing Base Property shall exceed $500,000.

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     Section 8.03 Maintenance, Etc.

     (a) Generally. The Borrower shall and shall cause each Subsidiary to: preserve
and maintain its corporate existence and all of its material rights, privileges and
franchises; keep books of record and account in which full, true and correct entries will be
made of all dealings or transactions in relation to its business and activities; comply with
all Governmental Requirements if failure to comply with such requirements will have a
Material Adverse Effect; pay and discharge all taxes, assessments and governmental charges
or levies imposed on it or on its income or profits or on any of its Property prior to the
date on which penalties attach thereto, except for any such tax, assessment, charge or levy
the payment of which is being contested in good faith and by proper proceedings and against
which adequate reserves are being maintained; upon reasonable notice, permit representatives
of the Administrative Agent or any Lender, during normal business hours, to examine, copy
and make extracts from its books and records, to inspect its Properties, and to discuss its
business and affairs with its officers, all to the extent reasonably requested by such
Lender or the Administrative Agent (as the case may be); and keep, or cause to be kept,
insured by financially sound and reputable insurers all Property of a character usually
insured by Persons engaged in the same or similar business similarly situated against loss
or damage of the kinds and in the amounts customarily insured against by such Persons and
carry such other insurance as is usually carried by such Persons. The Borrower shall
promptly obtain endorsements to such insurance policies naming “Union Bank of California,
N.A., as Administrative Agent for the Beneficiaries” as joint loss payee and containing
provisions that such policies will not be canceled without 30 days prior written notice
having been given by the insurance company to the Administrative Agent.

     (b) Proof of Insurance. Contemporaneously with the delivery of the financial
statements required by Section 8.01(a) to be delivered for each year, the Borrower will
furnish or cause to be furnished to the Administrative Agent and the Lenders a certificate
of insurance coverage from the insurer in form and substance satisfactory to the
Administrative Agent and, if requested, will furnish the Administrative Agent and the
Lenders copies of the applicable policies.

     (c) Oil and Gas Properties. The Borrower will and will cause each Subsidiary
to, at its own expense, (i) do or cause to be done all things reasonably necessary to
preserve and keep in good repair, working order and efficiency all of its Oil and Gas
Properties and other material Properties 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 its Oil
and Gas Properties and other material Properties will be preserved and maintained in
accordance with customary industry standards, except to the extent a portion of such
Properties is no longer capable of producing Hydrocarbons in economically reasonable amounts
and (ii) maintain good and defensible title to its material (individually and in the
aggregate) Properties, free and clear of all Liens, except Liens permitted by Section 9.02.
The Borrower will and will cause each Subsidiary to promptly: (i) pay and discharge, or make
reasonable and customary efforts to cause to be paid and discharged, all delay rentals,
royalties, expenses and indebtedness accruing under the material leases or other

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agreements affecting or pertaining to its Oil and Gas Properties, (ii) perform or make
reasonable and customary efforts to cause to be performed, in accordance with customary
industry standards, the material obligations required by each and all of the material
assignments, deeds, leases, sub leases, contracts and agreements affecting its interests in
its Oil and Gas Properties and other material Properties, (iii) will and will cause each
Subsidiary to do all other things reasonably necessary to keep unimpaired, except for Liens
permitted under Section 9.02, its rights with respect to its Oil and Gas Properties and
other material Properties and prevent any material forfeiture thereof or default thereunder,
except to the extent a portion of such Properties is no longer capable of producing
Hydrocarbons in economically reasonable amounts and except for dispositions permitted by
Section 9.15. The Borrower will and will cause each Subsidiary to operate its Oil and Gas
Properties and other material Properties or cause or make reasonable and customary efforts
to cause such Oil and Gas Properties and other material Properties to be operated in a
reasonably prudent manner in accordance with the customary practices of the industry and in
compliance in all material respects with all applicable contracts and agreements and in
compliance in all material respects with all Governmental Requirements. The Borrower will
not amend, waive, or release any such contract if such amendment, waiver or release could
reasonably be expected to cause a Material Adverse Effect.

     Section 8.04 Environmental Matters.

     (a) Establishment of Procedures. The Borrower will and will cause each
Subsidiary to establish and implement such procedures as may be reasonably necessary to
continuously determine and assure that any failure of the following could not reasonably be
expected to have a Material Adverse Effect: (i) all Property of the Borrower and its
Subsidiaries and the operations conducted thereon and other activities of the Borrower and
its Subsidiaries are in compliance with and do not violate the requirements of any
Environmental Laws, (ii) no oil, hazardous substances or solid wastes are disposed of or
otherwise released on or to any Property owned by any such party except in compliance with
Environmental Laws, (iii) no hazardous substance will be released on or to any such Property
in a quantity equal to or exceeding that quantity which requires reporting pursuant to
Section 103 of CERCLA, and (iv) no oil, oil and gas exploration and production wastes or
hazardous substance is released on or to any such Property so as to pose an imminent and
substantial endangerment to public health or welfare or the environment.

     (b) Notice of Action. The Borrower will promptly notify the Administrative
Agent and the Lenders in writing of any threatened action, investigation or inquiry by any
Governmental Authority of which the Borrower has knowledge in connection with any
Environmental Laws, excluding routine testing, monitoring and corrective action.

     (c) Future Acquisitions. The Borrower will and will cause each Subsidiary to
provide environmental audits and tests as reasonably requested by the Administrative Agent
or the Lenders (or as otherwise required to be obtained by the Administrative Agent or the
Lenders by any Governmental Authority) in connection with any future acquisitions of
material Oil and Gas Properties or other material Properties.

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     Section 8.05 Further Assurances. The Borrower will 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 and this Agreement. The Borrower at its expense will and will cause
each Guarantor to promptly execute and deliver to the Administrative Agent upon request all such
other documents, agreements and instruments to comply with or accomplish the covenants and
agreements of the Borrower or any Guarantor, as the case may be, in the Security Instruments and
this Agreement, or to further evidence and more fully describe the collateral intended as security
for the Notes, or to correct any omissions in the Security Instruments, or to state more fully the
security obligations set out herein or in any of the Security Instruments, or to perfect, protect
or preserve any Liens created pursuant to any of the Security Instruments, or to make any
recordings, to file any notices or obtain any consents, all as may be necessary or appropriate in
connection therewith.

     Section 8.06 Performance of Obligations. The Borrower will pay the Notes according to
the reading, tenor and effect thereof; and the Borrower will and will cause each Subsidiary to do
and perform every act and discharge all of the obligations to be performed and discharged by them
under the Security Instruments and this Agreement, at the time or times and in the manner
specified.

     Section 8.07 Engineering Reports.

     (a) Not less than 60 days prior to each Scheduled Redetermination Date, commencing with
the Scheduled Redetermination Date to occur on or around November 1, 2006, the Borrower
shall furnish to the Administrative Agent and the Lenders a Reserve Report. The Reserve
Report for the November 1 redetermination of each year shall be for reserves attributable to
the Borrowing Base Properties as of the previous July 1, and prepared by or under the
supervision of the chief engineer of the Borrower who shall certify such Reserve Report to
be true and accurate and to have been prepared in all material respects in accordance with
the procedures (other than forecasted product prices) used in the immediately preceding
Reserve Report prepared for the prior May 1 Scheduled Redetermination Date. The May 1
Reserve Report of each year shall be for reserves attributable to the Borrowing Base
Properties as of the previous January 1, and prepared by certified independent petroleum
engineers or other independent petroleum consultant(s) acceptable to the Administrative
Agent.

     (b) In the event of an unscheduled redetermination, the Borrower shall furnish to the
Administrative Agent and the Lenders a Reserve Report prepared by or under the supervision
of the chief engineer of the Borrower who shall certify such Reserve Report to be true and
accurate and to have been prepared in all material respects in accordance with the
procedures (other than forecasted product prices) used in the immediately preceding Reserve
Report. For any unscheduled redetermination requested by the Majority Lenders or the
Borrower pursuant to Section 2.08(d)), the Borrower shall provide such Reserve Report with
an “as of” date as required by the Majority Lenders as soon as possible, but in any event no
later than 30 days following the receipt of the request by the Administrative Agent.

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     (c) With the delivery of each Reserve Report, the Borrower shall provide to the
Administrative Agent and the Lenders, a certificate from a Responsible Officer certifying
that, to the best of his knowledge and in all material respects: (i) the information
contained in the Reserve Report and any other information delivered in connection therewith
is true and correct, (ii) the Borrower owns good and defensible title to the Borrowing Base
Properties evaluated in such Reserve Report and such Properties are free of all Liens except
for Liens permitted by Section 9.02, (iii) except as set forth on an exhibit to the
certificate, on a net basis there are no gas imbalances, take or pay or other prepayments
with respect to its Borrowing Base Properties evaluated in such Reserve Report which would
require the Borrower to deliver Hydrocarbons produced from such Borrowing Base Properties at
some future time without then or thereafter receiving full payment therefor, (iv) none of
its Borrowing Base Properties listed in the immediately prior Reserve Report as having
proved reserves have been sold since the date of the last Borrowing Base determination
except as set forth on an exhibit to the certificate, which certificate shall list all of
such Borrowing Base Properties sold and in such detail as reasonably required by the
Administrative Agent, (v) attached to the certificate is a list of all Persons disbursing
proceeds to the Borrower from its Mortgaged Oil and Gas Properties and (vi) except as set
forth on a schedule attached to the certificate all of the Borrowing Base Properties
evaluated by such Reserve Report are Mortgaged Oil and Gas Properties.

     Section 8.08 Title Information.

     (a) Delivery. On or before the delivery to the Administrative Agent and the
Lenders of each Reserve Report required by Section 8.07(a), the Borrower will deliver title
information in form and substance acceptable to the Administrative Agent covering enough of
the Mortgaged Oil and Gas Properties evaluated by such Reserve Report that were not included
in the immediately preceding Reserve Report, so that the Administrative Agent shall have
received together with title information previously delivered to the Administrative Agent,
satisfactory title information on at least seventy-five percent (75%) of the value of the
Mortgaged Oil and Gas Properties evaluated by such Reserve Report.

     (b) Cure of Title Defects. The Borrower shall cure any title defects or
exceptions which are not Excepted Liens raised by such information, or substitute acceptable
Oil and Gas Properties of an equivalent value, with no title defects or exceptions except
for Excepted Liens, within 60 days after a request by the Administrative Agent or the
Lenders to cure such defects or exceptions.

     (c) Failure to Cure Title Defects. If the Borrower is unable to cure any title
defect requested by the Administrative Agent or the Lenders to be cured within the 60- day
period or the Borrower does not comply with the requirements to provide acceptable title
information covering seventy-five percent (75%) of the value of the Mortgaged Oil and Gas
Properties evaluated in the most recent Reserve Report and included in the determination of
the then current Borrowing Base, such default shall not be a Default or an Event of Default,
but instead the Administrative Agent and the Lenders shall have the right to exercise the
following remedy in their sole discretion from time to time, and any

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failure to so exercise this remedy at any time shall not be a waiver as to future
exercise of the remedy by the Administrative Agent or the Lenders. To the extent that the
Administrative Agent or the Lenders are not satisfied with title to any Mortgaged Oil and
Gas Property after the time period in Section 8.08(b) has elapsed, such unacceptable
Mortgaged Oil and Gas Property shall not count towards the seventy-five percent (75%)
requirement, and the Administrative Agent may send a notice to the Borrower and the Lenders
that the then outstanding Borrowing Base shall be reduced by an amount as determined by all
of the Lenders to cause the Borrower to be in compliance with the requirement to provide
acceptable title information on seventy-five percent (75%) of the value of the Mortgaged Oil
and Gas Properties included in the determination of the Borrowing Base. This new Borrowing
Base shall become effective immediately after receipt of such notice.

     Section 8.09 Collateral.

     (a) Collateral. The Obligations shall be secured by a perfected first priority
Lien (subject only to Liens permitted under Section 9.02 entitled to priority under
applicable law or under Section 9.02) granted to the Administrative Agent for the benefit of
the Beneficiaries in (i) the Oil and Gas Properties of the Borrower and the Guarantors,
whether now owned or hereafter acquired, pursuant to the terms of the Security Instruments
to which they are parties, and which compose at least 80% of the value of the Borrowing Base
Properties described in the most recent Reserve Report and (ii) all of the accounts
receivable, inventory, contract rights, all of the equity interests in all Subsidiaries of
the Borrower and each Guarantor organized in a state, province, or territory of the United
States of America and 65% of the equity interests in all Subsidiaries of the Borrower and
each Guarantor organized in a jurisdiction other than a state, province or territory of the
United States pursuant to the terms of the Security Instruments to which they are parties.
Notwithstanding the foregoing, (i) none of the Borrower’s or any of its Subsidiaries’
ownership interest in and to Medusa Spar, LLC shall be part of the collateral security for
the Obligations and (ii) none of the Borrower’s or any of its Subsidiaries’ ownership in and
to (A) the Entrada Field or related equipment, accounts receivable, contracts, general
intangibles or other assets (collectively, the “Entrada Assets”) or (B) any equity
interests of any Affiliate or Subsidiary of the Borrower formed in connection with any
Permitted Entrada Transaction (other than an Affiliate that is a Subsidiary of the Borrower
that owns any material or significant asset other than Entrada Assets or that is a
Guarantor) (an “Entrada Entity”) shall be collateral security for the Obligations
unless the Borrower has notified the Administrative Agent, in writing, that it has elected
to include such Entrada Assets or any other assets owned by such Entrada Entity as a portion
of the Borrowing Base.

     (b) Title Information. Subject to the provisions of Section 8.08, concurrently
with the granting of the Lien or other action referred to in Section 8.09(a) above, the
Borrower will provide to the Administrative Agent title information in form and substance
satisfactory to the Administrative Agent in its sole discretion with respect to the
Borrower’s interests in such Mortgaged Oil and Gas Properties.

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     (c) Legal Opinions. Also, promptly after the filing of any new Security
Instrument in any state, upon the reasonable request of the Administrative Agent, the
Borrower will provide to the Administrative Agent an opinion addressed to the Administrative
Agent for the benefit of the Lenders in form and substance satisfactory to the
Administrative Agent in its sole discretion from counsel acceptable to Administrative Agent,
stating that the Security Instrument is valid, binding and enforceable in accordance with
its terms in legally sufficient form for such jurisdiction, and the means by which such
Security Instrument will perfect the Lien created thereby.

     Section 8.10 ERISA Information and Compliance. The Borrower will promptly furnish and
will cause the Subsidiaries and any ERISA Affiliate to promptly furnish to the Administrative Agent
with sufficient copies to the Lenders (i) promptly after the filing thereof with the United States
Secretary of Labor, the Internal Revenue Service or the PBGC, copies of each annual and other
report with respect to each Plan or any trust created thereunder, (ii) immediately upon becoming
aware of the occurrence of any ERISA Event or of any “prohibited transaction,” as described in
section 406 of ERISA or in section 4975 of the Code, in connection with any Plan or any trust
created thereunder, a written notice signed by a Responsible Officer specifying the nature thereof,
what action the Borrower, the Subsidiary or the ERISA Affiliate is taking or proposes to take with
respect thereto, and, when known, any action taken or proposed by the Internal Revenue Service, the
Department of Labor or the PBGC with respect thereto, and (iii) immediately upon receipt thereof,
copies of any notice of the PBGC’s intention to terminate or to have a trustee appointed to
administer any Plan. With respect to each Plan (other than a Multiemployer Plan), the Borrower
will, and will cause each Subsidiary and ERISA Affiliate to, (i) satisfy in full and in a timely
manner, without incurring any late payment or underpayment charge or penalty and without giving
rise to any lien, all of the contribution and funding requirements of section 412 of the Code
(determined without regard to subsections (d), (e), (f) and (k) thereof) and of section 302 of
ERISA (determined without regard to sections 303, 304 and 306 of ERISA), and (ii) pay, or cause to
be paid, to the PBGC in a timely manner, without incurring any late payment or underpayment charge
or penalty, all premiums required pursuant to sections 4006 and 4007 of ERISA.

     Section 8.11 Inspection; Books and Records. Upon reasonable notice, the Borrower will
and will cause each Guarantor to permit the Administrative Agent and any Lender or any of their
respective agents or representatives thereof, during normal business hours and subject to the terms
of any applicable confidentiality or non-disclosure agreements to which the Borrower or such
Guarantor may be bound, to (a) examine and make copies of and abstracts from the records and books
of account of, and visit and inspect at their reasonable discretion the Properties of, the Borrower
or such Guarantor, and (b) discuss the affairs, finances and accounts of the Borrower or such
Guarantor with any of their respective officers or directors, all to the extent reasonably
requested by the Administrative Agent or such Lender, as the case may be. The Borrower will and
will cause each Guarantor to keep proper books of records and account in which full, true and
correct entries in conformity with GAAP and all Governmental Requirements in all material respects
shall be made of all dealings and transactions in relation to its business and activities.

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ARTICLE IX

Negative Covenants

     The Borrower covenants and agrees that, so long as any of the Commitments are in effect and
until payment in full of Loans hereunder, all interest thereon and all other amounts payable by the
Borrower hereunder, without the prior written consent of the Majority Lenders:

     Section 9.01 Debt. Neither the Borrower nor any Subsidiary will incur, create, assume
or permit to exist any Debt, except:

     (a) the Notes or other Obligations or any guaranty of or suretyship arrangement for the
Notes or other Obligations;

     (b) Debt of the Borrower and its Subsidiaries existing on the Closing Date which is
reflected in the Financial Statements or is disclosed in Schedule 9.01, and any
renewals or extensions (but not increases) thereof;

     (c) accounts payable (for the deferred purchase price of Property or services) from
time to time incurred in the ordinary course of business which, if greater than 120 days
past the invoice or billing date, are being contested in good faith by appropriate
proceedings, provided that reserves adequate under GAAP shall have been established
therefor;

     (d) purchase money Debt and Debt under capital leases (as required to be reported on
the financial statements of the Borrower pursuant to GAAP) in addition to any obligations
that are Debt as permitted under Section 9.05, not to exceed $5,000,000, provided, however,
that the obligations due under the Hanover Processing Agreement shall not be considered
capital lease obligations for purposes of the limitation on capital leases contained in this
Section 9.01(d);

     (e) Debt in addition to any Debt not otherwise permitted this Section 9.01 that is
unsecured and not to exceed [$5,000,000] in the aggregate outstanding at one time;

     (f) Subordinated Debt in an amount not to exceed $40,000,000 in the aggregate
outstanding at any one time, provided that such Subordinated Debt has (i) a final maturity
after September 30, 2010 and (ii) no sinking fund payments, scheduled principal payments, or
mandatory redemption obligations on or prior to September 30, 2010;

     (g) Existing Other Debt and any refinancings, renewals or extensions (but not
increases) of such Existing Other Debt, provided that any such refinancing (i) provides for
a final maturity after September 30, 2010, (ii) has no sinking fund payments, scheduled
principal payments, or mandatory redemption obligations on or prior to September 30, 2010,
and (iii) is otherwise pursuant to terms and conditions satisfactory to the Majority
Lenders, provided further that if any such refinancing is being accomplished by using the
proceeds from an issuance of preferred stock of the Borrower, then such issuance complies
with Section 9.21 hereof;

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     (h) Debt associated with bonds or surety obligations required by Governmental
Requirements in connection with the operation of the Oil and Gas Properties of the Borrower
and its Subsidiaries;

     (i) Hedging Agreements covering (A) oil and gas production of proved developed
producing Oil and Gas Properties of the Borrower or any Guarantor; provided,
however, that such Hedging Agreements related to oil or gas production shall not,
either individually or in the aggregate, cover more than ninety percent (90%) of estimated
production of oil or gas of the Borrower and the Guarantors for each individual period
covered by the Hedging Agreements and (B) fluctuations in interest rates for notional
principal amounts not to exceed at any time outstanding 80% of the Debt for borrowed money
of the Borrower and its Consolidated Subsidiaries; and

     (j) any Permitted Entrada Transaction.

     Section 9.02 Liens. Neither the Borrower nor any Subsidiary will create, incur,
assume or permit to exist any Lien on any of its Properties (now owned or hereafter acquired except
for the Additional Entrada Assets), except:

     (a) Liens securing the payment of any Obligations (provided that any Lien securing any
of the Obligations must secure all of the Obligations);

     (b) Excepted Liens;

     (c) Liens securing leases allowed under Section 9.01(d), but only on the Property under
lease;

     (d) Liens disclosed on Schedule 9.02;

     (e) Liens on cash or securities of the Borrower or any Subsidiary securing the Debt
described in Section 9.01(h) and 9.01(i); provided, however that the
aggregate amount of cash or securities which may secure Debt described in Section 9.01(i)
shall not exceed $7,500,000;

     (f) Liens on Entrada Assets or the equity interests of an Entrada Entity granted to
secure the obligations under any Permitted Entrada Transaction so long as such Entrada
Assets are not included in the Borrowing Base and no other assets of an Entrada Entity is
included in the Borrowing Base; and

     (g) other Liens securing Debt permitted under Section 9.01 not exceeding $5,000,000 in
the aggregate at any time.

     Section 9.03 Investments, Loans and Advances. Neither the Borrower nor any Guarantor
will make or permit to remain outstanding any loans or advances to or investments in any Person,
except that the foregoing restriction shall not apply to:

     (a) investments, loans or advances reflected in the Financial Statements or which are
disclosed to the Lenders in Schedule 9.03;

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     (b) accounts receivable arising in the ordinary course of business;

     (c) direct obligations of the United States or any agency thereof, or obligations
guaranteed by the United States or any agency thereof, in each case maturing within one year
from the date of creation thereof;

     (d) commercial paper maturing within one year from the date of creation thereof rated
in one of the two highest grades by Standard & Poor’s Corporation or Moody’s Investors
Service, Inc.;

     (e) deposits maturing within one year from the date of creation thereof with, including
certificates of deposit issued by, any Lender or any office located in the United States of
any other bank or trust company which is organized under the laws of the United States or
any state thereof, has capital, surplus and undivided profits aggregating at least
$500,000,000 (as of the date of such Lender’s or bank or trust company’s most recent
financial reports) and has a short term deposit rating of no lower than A2 or P2, as such
rating is set forth from time to time, by Standard & Poor’s Corporation or Moody’s Investors
Service, Inc., respectively;

     (f) deposits in money market funds investing exclusively in investments described in
Section 9.03(c), 9.03(d) or 9.03(e);

     (g) investments, loans or advances made by the Borrower in or to the Guarantors or by
any Guarantor in or to Borrower or another Guarantor;

     (h) investments by the Borrower in direct ownership interests in additional Oil and Gas
Properties and gas gathering systems related thereto, and investments, loans or advances in
connection with or related to farm out agreements, farm in agreements, joint operating
agreements, joint venture or area of mutual interest agreements, processing facilities,
seismic acquisition and evaluation, pipelines or other similar or customary arrangements
made in the ordinary course of business only insofar as they do not (i) reduce the net
revenue interest of the Borrower or any Guarantor in any Borrowing Base Property for which
value was given in the most recent Borrowing Base redetermination below the undivided net
revenue interest specified for the Borrower or such Guarantor in the most recent Reserve
Report utilized by the Administrative Agent and the Lenders in determining the then
effective Borrowing Base and/or (ii) increase the undivided working interest in any such
Borrowing Base Property without a corresponding increase in the net revenue interest
specified for the Borrower or such Guarantor in the most recent Reserve Report utilized by
the Administrative Agent and the Lenders in determining the then effective Borrowing Base;

     (i) loans or advances to employees of the Borrower and the Guarantors in the ordinary
course of business not to exceed an amount equal to $1,000,000 in the aggregate at any time
outstanding;

     (j) in addition to the contribution, transfer or conveyance of all or a portion of the
Entrada Assets to any Affiliate of the Borrower (other than an Affiliate that is a
Subsidiary of the Borrower that owns any material or significant asset other than Entrada

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Assets or that is a Guarantor), cash investments, loans or advances made by the
Borrower in or to the Entrada Entity in an aggregate amount not to exceed $10,000,000;
provided that, at the request of the Borrower, the Majority Lenders may, in their sole
discretion, increase such amount; and

     (k) other investments, loans or advances not to exceed, in the aggregate at any time
outstanding, an amount equal to $10,000,000.

     Section 9.04 Dividends, Distributions and Redemptions. The Borrower will not declare
or pay any dividend, purchase, redeem or otherwise acquire for value any of its stock now or
hereafter outstanding, return any capital to its stockholders or make any distribution of its
assets to its stockholders, except that, if no Default exists or would result therefrom, the
Borrower may (i) pay cash dividends on preferred stock issued to refinance Subordinated Debt or
Existing Other Debt pursuant to Section 9.01(g) hereof, (ii) redeem preferred stock with the
proceeds of or in connection with the issuance of equity securities, and (iii) pay stock dividends
only in common stock of the Borrower.

     Section 9.05 Sales and Leasebacks. Neither the Borrower nor any Subsidiary will enter
into any arrangement, directly or indirectly, with any Person whereby the Borrower or any
Subsidiary shall sell or transfer any of its Borrowing Base Property with respect to Borrowing Base
Property having a value, in the aggregate at any time outstanding, in excess of $5,000,000, whether
now owned or hereafter acquired, and whereby the Borrower or any Subsidiary shall then or
thereafter rent or lease as lessee such Borrowing Base Property or any part thereof or other
Borrowing Base Property which the Borrower or any Subsidiary intends to use for substantially the
same purpose or purposes as the Borrowing Base Property sold or transferred; provided,
however, that the sale of Property undertaken pursuant to the Hanover Sales Documents shall
not be deemed to be a sale and leaseback for purposes of the limitations on sales and leasebacks of
Property contained in this Section 9.05.

     Section 9.06 Nature of Business. Neither the Borrower nor any Subsidiary will allow
any material change to be made in the character of its business as an independent oil and gas
exploration and production company.

     Section 9.07 [Intentionally omitted].

     Section 9.08 Mergers, Etc. Neither the Borrower nor any Subsidiary will merge into or
with or consolidate with any other Person, or sell, lease or otherwise dispose of (whether in one
transaction or in a series of transactions) all or substantially all of its Property or assets to
any other Person, except that, provided no Default or Change of Control exists or would result
therefrom, (i) any Subsidiary may merge into, or transfer all or substantially all of its Property
or assets to, the Borrower (provided the Borrower is the surviving entity) or with any other
Guarantor and (ii) the Borrower or any Subsidiary may merge with, or transfer all or substantially
all of its Property or assets to, another Person if the Borrower or such Subsidiary is the
surviving entity. The Borrower shall provide the Administrative Agent with at least 30 days prior
written notice of any merger or consolidation permitted by this Section 9.08.

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     Section 9.09 Proceeds of Notes; Letters of Credit. The Borrower will not permit the
proceeds of the Notes or Letters of Credit to be used for any purpose other than those permitted by
Section 7.07. Neither the Borrower nor any Person acting on behalf of the Borrower has taken or
will take any action which might cause any of the Loan Documents to violate Regulation T, U or X or
any other regulation of the Board of Governors of the Federal Reserve System or to violate Section
7 of the Securities Exchange Act of 1934 or any rule or regulation thereunder, in each case as now
in effect or as the same may hereinafter be in effect.

     Section 9.10 ERISA Compliance. The Borrower will not at any time:

     (a) Engage in, or permit any Subsidiary or ERISA Affiliate to engage in, any
transaction in connection with which the Borrower, any Subsidiary or any ERISA Affiliate
could be subjected to either a civil penalty assessed pursuant to section 502(c), (i) or (l)
of ERISA or a tax imposed by Chapter 43 of Subtitle D of the Code;

     (b) Terminate, or permit any Subsidiary or ERISA Affiliate to terminate, any Plan in a
manner, or take any other action with respect to any Plan, which could result in any
material liability to the Borrower, any Subsidiary or any ERISA Affiliate to the PBGC;

     (c) Fail to make, or permit any Subsidiary or ERISA Affiliate to fail to make, full
payment when due of all amounts which, under the provisions of any Plan, agreement relating
thereto or applicable law, the Borrower, a Subsidiary or any ERISA Affiliate is required to
pay as contributions thereto;

     (d) Permit to exist, or allow any Subsidiary or ERISA Affiliate to permit to exist, any
accumulated funding deficiency within the meaning of Section 302 of ERISA or section 412 of
the Code, whether or not waived, with respect to any Plan;

     (e) Permit, or allow any Subsidiary or ERISA Affiliate to permit, the actuarial present
value of the benefit liabilities under any Plan maintained by the Borrower, any Subsidiary
or any ERISA Affiliate which is regulated under Title IV of ERISA to exceed the current
value of the assets (computed on a plan termination basis in accordance with Title IV of
ERISA) of such Plan allocable to such benefit liabilities. The term “actuarial present
value of the benefit liabilities” shall have the meaning specified in section 4041 of ERISA;

     (f) Contribute to or assume an obligation to contribute to, or permit any Subsidiary or
ERISA Affiliate to contribute to or assume an obligation to contribute to, any Multiemployer
Plan;

     (g) Acquire, or permit any Subsidiary or ERISA Affiliate to acquire, an interest in any
Person that causes such Person to become an ERISA Affiliate with respect to the Borrower,
any Subsidiary or any ERISA Affiliate if such Person sponsors, maintains or contributes to,
or at any time in the six year period preceding such acquisition has sponsored, maintained,
or contributed to, (1) any Multiemployer Plan, or (2) any other Plan that is subject to
Title IV of ERISA under which the actuarial present value of the benefit liabilities under
such Plan exceeds the current value of the assets

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(computed on a plan termination basis in accordance with Title IV of ERISA) of such
Plan allocable to such benefit liabilities;

     (h) Incur, or permit any Subsidiary or ERISA Affiliate to incur, a liability to or on
account of a Plan under sections 515, 4062, 4063, 4064, 4201 or 4204 of ERISA;

     (i) Contribute to or assume an obligation to contribute to, or permit any Subsidiary or
ERISA Affiliate to contribute to or assume an obligation to contribute to, any employee
welfare benefit plan, as defined in section 3(1) of ERISA, including, without limitation,
any such plan maintained to provide benefits to former employees of such entities, that may
not be terminated by such entities in their sole discretion at any time without any material
liability; or

     (j) Amend or permit any Subsidiary or ERISA Affiliate to amend, a Plan resulting in an
increase in current liability such that the Borrower, any Subsidiary or any ERISA Affiliate
is required to provide security to such Plan under section 401(a)(29) of the Code.

     Section 9.11 [Intentionally omitted].

     Section 9.12 Current Ratio. The Borrower will not permit its ratio of (a)
consolidated current assets, plus the amount equal to the difference between (i) the Borrowing Base
and (ii) the sum of all Loans outstanding, plus LC Exposure to (b) consolidated current liabilities
(excluding current maturities of long term debt (determined in accordance with GAAP)) to be less
than 1.0 to 1.0 at any time. For purposes of this Section 9.12, “consolidated current
assets” shall mean assets which would, in accordance with GAAP, be included as current assets
on a consolidated balance sheet of the Borrower and its Consolidated Subsidiaries and
“consolidated current liabilities” shall mean liabilities which would, in accordance with
GAAP, be included as current liabilities on a consolidated balance sheet of the Borrower and its
Consolidated Subsidiaries. Notwithstanding the foregoing, consolidated current liabilities shall
be determined excluding recognized but unrealized gains and/or losses attributable to commodity or
interest rate derivative instruments or asset retirement obligations determined under the
provisions of Financial Accounting Standards Board Statements (“FASB”) 133 or 143, as the same may
be further amended, modified or clarified by the FASB.

     Section 9.13 Fixed Charge Coverage Ratio. The Borrower will not permit its Fixed
Charge Coverage Ratio as of the end of any fiscal quarter of the Borrower (calculated quarterly at
the end of each fiscal quarter) to be less than 2.50 to 1.00. For purposes of this Section 9.13,
“Fixed Charge Coverage Ratio” shall mean the ratio of (a) EBITDA for the immediately
preceding four fiscal quarters of the Borrower and its Consolidated Subsidiaries to (b) the sum of
cash interest expense, capital lease obligations, required payments of principal on Debt
(excluding, however, any principal due upon the final maturity date for such Debt), and preferred
dividends paid in cash by the Borrower and its Consolidated Subsidiaries during such four fiscal
quarters.

     Section 9.14 Leverage Ratio. The Borrower will not permit its Leverage Ratio as of
the end of any fiscal quarter of the Borrower (calculated quarterly at the end of each fiscal
quarter)

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to be greater than 4.00 to 1.00. For the purposes of this Section 9.14, “Leverage
Ratio” shall mean the ratio of (a) Funded Debt for the Borrower and its Subsidiaries on a
Consolidated basis as of the end of such fiscal quarter to (b) EBITDA for the immediately preceding
four fiscal quarters of the Borrower and its Consolidated Subsidiaries then ended.

     Section 9.15 Sale of Oil and Gas Properties. The Borrower will not, and will not
permit any Guarantor to, sell, assign, farm-out, convey or otherwise transfer any Borrowing Base
Property or any interest in any Borrowing Base Property (a “Transfer”) except for (a) the
sale of Hydrocarbons in the ordinary course of business; (b) farmouts of undeveloped acreage and
assignments in connection with such farmouts; (c) the sale or transfer of equipment that is no
longer necessary for the business of the Borrower or such Guarantor or is contemporaneously
replaced by equipment of at least comparable value and use and (d) during any consecutive 12 month
period, sales in the ordinary course of business of Borrowing Base Properties which shall not
exceed 15% of the then current Borrowing Base; provided, however, that upon any
such Transfer of Borrowing Base Properties the Lenders may reduce the Borrowing Base by an amount
equal to 100% of the loan value of such Collateral and if a Borrowing Base Deficiency results
therefrom, the Borrower shall concurrently, with completing such Transfer, made a prepayment of the
outstanding principal amount of the Loans sufficient to eliminate such Borrowing Base Deficiency.

     Section 9.16 Environmental Matters. Neither the Borrower nor any Subsidiary will
cause or permit any of its Property to be in violation of, or do anything or permit anything to be
done which will subject any such Property to any remedial obligations under any Environmental Laws,
assuming disclosure to the applicable Governmental Authority of all relevant facts, conditions and
circumstances, if any, pertaining to such Property where such violations or remedial obligations
would have a Material Adverse Effect.

     Section 9.17 Transactions with Affiliates. Neither the Borrower nor any Subsidiary
will enter into any transaction, including, without limitation, any purchase, sale, lease or
exchange of Property or the rendering of any service, with any Affiliate (other than the Borrower
or a Guarantor) unless such transactions are otherwise permitted under this Agreement, are in the
ordinary course of its business and are upon fair and reasonable terms no less favorable to it than
it would obtain in a comparable arm’s length transaction with a Person not an Affiliate.

     Section 9.18 Subsidiaries. The Borrower shall not and shall not permit any Subsidiary
to sell or to issue any stock or ownership interest of a Subsidiary unless such sale or issuance
would be in compliance with Section 9.03 and the other terms and provisions of this Agreement.

     Section 9.19 Negative Pledge Agreements. Except for provisions in Existing Other Debt
documents, neither the Borrower nor any Guarantor will create, incur, assume or permit to exist any
contract, agreement or understanding (other than this Agreement and the Security Instruments, and
the agreements and instruments creating Liens otherwise permitted under Section 9.02 with respect
to the Property covered by such Liens only) which in any way prohibits or restricts the granting,
conveying, creation or imposition of any Lien on any of its Property or restricts any Guarantor
from paying dividends to the Borrower, or which requires the consent of or notice to other Persons
in connection therewith.

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     Section 9.20 [Reserved].

     Section 9.21 Subordinated Debt; Existing Other Debt. Neither the Borrower nor any
Guarantor shall make any voluntary prepayment in respect of any Subordinated Debt or the Existing
Other Debt, nor will they make any other payment thereon that would not be allowed under the
subordination provisions of any Subordinated Debt or the Existing Other Debt; provided that, the
Borrower and the Guarantor may prepay such Subordinated Debt or Existing Other Debt with proceeds
from an issuance of preferred stock of the Borrower; provided further that, (a) the maximum
aggregate amount of such prepayments may not exceed $75,000,000, (b) the dividend rate on such
preferred stock may not be greater than the interest rate on the Debt being repaid, and (c) such
preferred stock may not provide for mandatory redemption obligations on or prior to September 30,
2010. The Borrower will not amend, supplement or otherwise modify any instruments evidencing, or
agreements relating to or executed in connection with, any Existing Other Debt, in any manner which
would have the effect of (i) accelerating the timing or amount of any scheduled payments of
principal or interest thereon, (ii) increasing the rate of interest payable thereon or (iii)
resulting in a Material Adverse Effect.

     Section 9.22 Hanover Agreements. Without the prior written consent of the Lenders,
the Borrower will not, and will not permit any Subsidiary to, amend, supplement, restate or
otherwise modify the Hanover Processing Agreement, the Hanover Sales Documents or any other
document executed in connection therewith that could adversely affect in any material respect the
Lenders and their rights and remedies under any Loan Document.

     Section 9.23 Permitted Medusa Transactions; Permitted Entrada Transactions.
Notwithstanding anything in this Agreement or any other Loan Document to the contrary, so long as
no Default or Event of Default has occurred and is continuing at the time Borrower or any of its
Subsidiaries enters into any Permitted Medusa Transaction or Permitted Entrada Transaction, the
entering into and carrying out of such Permitted Medusa Transaction or Permitted Entrada
Transaction shall be allowed hereunder and shall not in itself constitute a breach of,
non-compliance with, or Default or Event of Default under this Agreement or any other Loan
Document.

ARTICLE X

Events of Default; Remedies

     Section 10.01 Events of Default. One or more of the following events shall constitute
an “Event of Default”:

     (a) the Borrower shall default in the payment or prepayment when due of any principal
of or interest on any Loan, or any reimbursement obligation for a disbursement made under
any Letter of Credit, or any fees or other amount payable by it hereunder or under any
Security Instrument and such default, other than a default of a payment or prepayment of
principal (which shall have no cure period), shall continue unremedied for a period of three
Business Days; or

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     (b) the Borrower or any Subsidiary shall default in the payment when due of any
principal of or interest on any of its other Debt aggregating $5,000,000 or more, or any
event specified in any note, agreement, indenture or other document evidencing or relating
to any such Debt shall occur if the effect of such event is to cause, or (with the giving of
any notice or the lapse of time or both) to permit the holder or holders of such Debt (or a
trustee or agent on behalf of such holder or holders) to cause, such Debt to become due
prior to its stated maturity; or

     (c) any representation, warranty or certification made or deemed made herein or in any
Security Instrument by the Borrower or any Subsidiary, or any certificate furnished to any
Lender or the Administrative Agent pursuant to the provisions hereof or any Security
Instrument, shall prove to have been false or misleading as of the time made or furnished in
any material respect; or

     (d) the Borrower shall default in the performance of any of its obligations under
Article IX, Section 8.01(c) or any other Article of this Agreement other than under Article
VIII (excluding Section 8.01(c)); or the Borrower shall default in the performance of any of
its obligations under Article VIII or any Security Instrument (other than the payment of
amounts due which shall be governed by Section 10.01(a)) and such default shall continue
unremedied for a period of thirty (30) days after the earlier to occur of (i) notice thereof
to the Borrower by the Administrative Agent or any Lender (through the Administrative
Agent), or (ii) the Borrower otherwise becoming aware of such default; or

     (e) the Borrower shall admit in writing its inability to, or be generally unable to,
pay its debts as such debts become due; or

     (f) the Borrower shall (i) apply for or consent to the appointment of, or the taking of
possession by, a receiver, custodian, trustee or liquidator of itself or of all or a
substantial part of its property, (ii) make a general assignment for the benefit of its
creditors, (iii) commence a voluntary case under the Federal Bankruptcy Code (as now or
hereafter in effect), (iv) file a petition seeking to take advantage of any other law
relating to bankruptcy, insolvency, reorganization, winding-up, liquidation or composition
or readjustment of debts, (v) fail to controvert in a timely and appropriate manner, or
acquiesce in writing to, any petition filed against it in an involuntary case under the
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
Borrower, in any court of competent jurisdiction, seeking (i) its liquidation,
reorganization, dissolution or winding-up, or the composition or readjustment of its debts,
(ii) the appointment of a trustee, receiver, custodian, liquidator or the like of the
Borrower of all or any substantial part of its assets, or (iii) similar relief in respect of
the Borrower under any law relating to bankruptcy, insolvency, reorganization, winding-up,
or composition or adjustment of debts, and such proceeding or case shall continue
undismissed, or an order, judgment or decree approving or ordering any of the foregoing
shall be entered and continue unstayed and in effect, for a period of 60 days; or (iv) an

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order for relief against the Borrower shall be entered in an involuntary case under the
Federal Bankruptcy Code; or

     (h) a judgment or judgments for the payment of money in excess of $5,000,000 in the
aggregate shall be rendered by a court against the Borrower or any Subsidiary and the same
shall not be discharged (or provision shall not be made for such discharge), or a stay of
execution thereof shall not be procured, within thirty (30) days from the date of entry
thereof and the Borrower or such Subsidiary shall not, within said period of 30 days, or
such longer period during which execution of the same shall have been stayed, appeal
therefrom and cause the execution thereof to be stayed during such appeal; or

     (i) the Security Instruments after delivery thereof shall for any reason, except to the
extent permitted by the terms thereof, cease to be in full force and effect and valid,
binding and enforceable in accordance with their terms, or cease to create a valid and
perfected Lien of the priority required thereby on any of the collateral purported to be
covered thereby, except to the extent permitted by the terms of this Agreement, or the
Borrower shall so state in writing; or

     (j) a Change of Control occurs; or

     (k) Any Guarantor takes, suffers or permits to exist any of the events or conditions
referred to in paragraphs (e), (f), (g) or (h) or if any provision of any guaranty agreement
related thereto shall for any reason cease to be valid and binding on such Guarantor or if
such Guarantor shall so state in writing; or

     (l) an Event of Default (as defined thereunder) shall occur under the Hanover
Processing Agreement or Hanover Sales Documents.

     Section 10.02 Remedies.

     (a) In the case of an Event of Default other than one referred to in clauses (e), (f)
or (g) of Section 10.01 or in clause (k) to the extent it relates to clauses (e), (f) or
(g), the Administrative Agent, upon request of the Majority Lenders, shall, by notice to the
Borrower, cancel the Commitments (in whole or part) and/or declare the principal amount then
outstanding of, and the accrued interest on all (but not less than all) of, the Loans and
all other amounts payable by the Borrower hereunder and under the Notes (including without
limitation the payment of cash collateral to secure the LC Exposure as provided in Section
2.10(b)) to be forthwith due and payable, whereupon such amounts shall be immediately due
and payable without presentment, demand, protest, notice of intent to accelerate, notice of
acceleration or other formalities of any kind, all of which are hereby expressly waived by
the Borrower.

     (b) In the case of the occurrence of an Event of Default referred to in clauses (e),
(f) or (g) of Section 10.01 or in clause (k) to the extent it relates to clauses (e), (f) or
(g), the Commitments shall be automatically canceled and the principal amount then
outstanding of, and the accrued interest on, the Loans and all other amounts payable by the
Borrower hereunder and under the Notes (including without limitation the payment of

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cash collateral to secure the LC Exposure as provided in Section 2.10(b)) shall become
automatically immediately due and payable without presentment, demand, protest, notice of
intent to accelerate, notice of acceleration or other formalities of any kind, all of which
are hereby expressly waived by the Borrower.

     (c) In the case of an acceleration of the Loans pursuant to the foregoing clause (a) or
(b) of this Section 10.02, or if the Borrower defaults in the full and complete payment of
all of the Loans or other Obligations due on the Revolving Credit Termination Date, then the
Administrative Agent, upon request of the Majority Lenders, shall take reasonable actions to
liquidate the Collateral.

     (d) All proceeds received after maturity of the Notes, whether by acceleration or
otherwise shall be applied as provided in Section 3.03.

ARTICLE XI

The Administrative Agent

     Section 11.01 Appointment, Powers and Immunities. Each Lender hereby irrevocably
appoints and authorizes the Administrative Agent to act as its agent hereunder and under the
Security Instruments with such powers as are specifically delegated to the Administrative Agent by
the terms of this Agreement and the Security Instruments, together with such other powers as are
reasonably incidental thereto. The Administrative Agent (which term as used in this sentence and
in Section 11.05 and the first sentence of Section 11.06 shall include reference to its Affiliates
and its and its Affiliates’ officers, directors, employees, attorneys, accountants, experts and
agents): (i) shall have no duties or responsibilities except those expressly set forth in the Loan
Documents, and shall not by reason of the Loan Documents be a trustee or fiduciary for any Lender;
(ii) makes no representation or warranty to any Lender and shall not be responsible to the Lenders
for any recitals, statements, representations or warranties contained in this Agreement, or in any
certificate or other document referred to or provided for in, or received by any of them under,
this Agreement, or for the value, validity, effectiveness, genuineness, execution, effectiveness,
legality, enforceability or sufficiency of this Agreement, any Note or any other document referred
to or provided for herein or for any failure by the Borrower or any other Person (other than the
Administrative Agent) to perform any of its obligations hereunder or thereunder or for the
existence, value, perfection or priority of any collateral security or the financial or other
condition of the Borrower, its Subsidiaries or any other obligor or guarantor; (iii) except
pursuant to Section 11.07 shall not be required to initiate or conduct any litigation or collection
proceedings hereunder; and (iv) shall not be responsible for any action taken or omitted to be
taken by it hereunder or under any other document or instrument referred to or provided for herein
or in connection herewith including its own ordinary negligence, except for its own gross
negligence or willful misconduct. The Administrative Agent may employ agents, accountants,
attorneys and experts and shall not be responsible for the negligence or misconduct of any such
agents, accountants, attorneys or experts selected by it in good faith or any action taken or
omitted to be taken in good faith by it in accordance with the advice of such agents, accountants,
attorneys or experts. The Administrative Agent may deem and treat the payee of any Note as the
holder thereof for all purposes hereof unless and until a written notice of the assignment or
transfer thereof permitted hereunder shall have been filed with the Administrative

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Agent. The Administrative Agent is authorized to release any collateral that is permitted to
be sold or released pursuant to the terms of the Loan Documents.

     Section 11.02 Reliance by Administrative Agent. The Administrative Agent shall be
entitled to rely upon any certification, notice or other communication (including any thereof by
telephone, telex, telecopier, telegram or cable) believed by it to be genuine and correct and to
have been signed or sent by or on behalf of the proper Person or Persons, and upon advice and
statements of legal counsel, independent accountants and other experts selected by the
Administrative Agent.

     Section 11.03 Defaults. The Administrative Agent shall not be deemed to have
knowledge of the occurrence of a Default (other than the non payment of principal of or interest on
Loans or of fees or failure to reimburse for Letter of Credit drawings) unless the Administrative
Agent has received notice from a Lender or the Borrower specifying such Default and stating that
such notice is a “Notice of Default.” In the event that the Administrative Agent receives such a
notice of the occurrence of a Default, the Administrative Agent shall give prompt notice thereof to
the Lenders. In the event of a payment Default, the Administrative Agent shall give each Lender
prompt notice of each such payment Default.

     Section 11.04 Rights as a Lender. With respect to its Commitments and the Loans made
by it and its participation in the issuance of Letters of Credit, UBOC (and any successor acting as
Administrative Agent) in its capacity as a Lender hereunder shall have the same rights and powers
hereunder as any other Lender and may exercise the same as though it were not acting as the
Administrative Agent, and the term “Lender” or “Lenders” shall, unless the context otherwise
indicates, include the Administrative Agent in its individual capacity. UBOC (and any successor
acting as Administrative Agent) and its Affiliates may (without having to account therefor to any
Lender) accept deposits from, lend money to and generally engage in any kind of banking, trust or
other business with the Borrower (and any of its Affiliates) as if it were not acting as the
Administrative Agent, and UBOC and its Affiliates may accept fees and other consideration from the
Borrower for services in connection with this Agreement or otherwise without having to account for
the same to the Lenders.

     Section 11.05 Indemnification. The Lenders agree to indemnify the
Administrative Agent and the Issuing Bank ratably in accordance with their Percentage Shares for
the Indemnity Matters as described in section 12.03 to the extent not indemnified or reimbursed by
the Borrower under section 12.03, but without limiting the obligations of the Borrower under said
section 12.03 and for any and all other liabilities, obligations, losses, damages, penalties,
actions, judgments, suits, costs, expenses or disbursements of any kind and nature whatsoever which
may be imposed on, incurred by or asserted against the Administrative Agent or the Issuing Bank in
any way relating to or arising out of: (i) this Agreement, the Security Instruments or any other
documents contemplated by or referred to herein or the transactions contemplated hereby, but
excluding, unless a Default has occurred and is continuing, normal administrative costs and
expenses incident to the performance of its agency duties hereunder or (ii) the enforcement of any
of the terms of this Agreement, any Security Instrument or of any such other documents; whether or
not any of 

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the foregoing specified in this section 11.05 arises from the sole or concurrent
negligence of the Administrative Agent or the Issuing Bank, provided that no Lender shall be liable
for any of the foregoing to the extent they arise from the gross negligence or willful misconduct
of the Administrative Agent.

     Section 11.06 Non-Reliance on Administrative Agent and other Lenders. Each Lender
acknowledges and agrees that it has, independently and without reliance on the Administrative Agent
or any other Lender, and based on such documents and information as it has deemed appropriate, made
its own credit analysis of the Borrower and its decision to enter into this Agreement, and that it
will, independently and without reliance upon the Administrative Agent or any other Lender, and
based on such documents and information as it shall deem appropriate at the time, continue to make
its own analysis and decisions in taking or not taking action under this Agreement. The
Administrative Agent shall not be required to keep itself informed as to the performance or
observance by the Borrower of this Agreement, the Notes, the Security Instruments or any other
document referred to or provided for herein or to inspect the properties or books of the Borrower.
Except for notices, reports and other documents and information expressly required to be furnished
to the Lenders by the Administrative Agent hereunder, the Administrative Agent shall not have any
duty or responsibility to provide any Lender with any credit or other information concerning the
affairs, financial condition or business of the Borrower (or any of its Affiliates) which may come
into the possession of the Administrative Agent or any of its Affiliates. In this regard, each
Lender acknowledges that Bracewell & Patterson, 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 Loan Document. Each Lender will consult with its own legal counsel to the
extent that it deems necessary in connection with the Loan Documents and the matters contemplated
therein.

     Section 11.07 Action by Administrative Agent. Except for action or other matters
expressly required of the Administrative Agent hereunder, the Administrative Agent shall in all
cases be fully justified in failing or refusing to act hereunder unless it shall (i) receive
written instructions from the Majority Lenders (or all of the Lenders as expressly required by
Section 12.04) specifying the action to be taken, and (ii) be indemnified to its satisfaction by
the Lenders against any and all liability and expenses which may be incurred by it by reason of
taking or continuing to take any such action. The instructions of the Majority Lenders (or all of
the Lenders as expressly required by Section 12.04) and any action taken or failure to act pursuant
thereto by the Administrative Agent shall be binding on all of the Lenders. If a Default has
occurred and is continuing, the Administrative Agent shall take such action with respect to such
Default as shall be directed by the Majority Lenders (or all of the Lenders as required by Section
12.04) in the written instructions (with indemnities) described in this Section 11.07, provided
that, unless and until the Administrative Agent shall have received such directions, the
Administrative Agent may (but shall not be obligated to) take such action, or refrain from taking
such action, with respect to such Default as it shall deem advisable in the best interests of the
Lenders. In no event, however, shall the Administrative Agent be required to take any action which
exposes the Administrative Agent to personal liability or which is contrary to this Agreement and
the Loan Documents or applicable law.

     Section 11.08 Resignation or Removal of Administrative Agent. Subject to the
appointment and acceptance of a successor Administrative Agent as provided below, the

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Administrative Agent may resign at any time by giving notice thereof to the Lenders and the
Borrower, and the Administrative Agent may be removed at any time with or without cause by the
Majority Lenders. Upon any such resignation or removal, the Majority Lenders shall have the right
to appoint a successor Administrative Agent with the consent of the Borrower (such consent not to
be unreasonably withheld). If no successor Administrative Agent shall have been so appointed by
the Majority Lenders and shall have accepted such appointment within thirty (30) days after the
retiring Administrative Agent’s giving of notice of resignation or the Majority Lenders’ removal of
the retiring Administrative Agent, then the retiring Administrative Agent may, on behalf of the
Lenders, appoint a successor Administrative Agent with the consent of the Borrower (such consent
not to be unreasonably withheld). Upon the acceptance of such appointment hereunder by a successor
Administrative Agent, such successor Administrative Agent shall thereupon succeed to and become
vested with all the rights, powers, privileges and duties of the retiring Administrative Agent, and
the retiring Administrative Agent shall be discharged from its duties and obligations hereunder.
After any retiring Administrative Agent’s resignation or removal hereunder as Administrative Agent,
the provisions of this Article XI and Section 12.03 shall continue in effect for its benefit in
respect of any actions taken or omitted to be taken by it while it was acting as the Administrative
Agent.

     Section 11.09 Agents. Neither the Syndication Agent nor the Documentation Agent shall
have any duties, obligations, or liabilities in such respective capacities; the Lenders shall have
no right to replace the Syndication Agent or the Documentation Agent if either the Syndication
Agent or the Documentation Agent is no longer a Lender, and neither the Syndication Agent nor the
Documentation Agent may assign its status as Syndication Agent or Documentation Agent to any
Person.

ARTICLE XII

Miscellaneous

     Section 12.01 Waiver. No failure on the part of the Administrative Agent or any
Lender to exercise and no delay in exercising, and no course of dealing with respect to, any right,
power or privilege under any of the Loan Documents shall operate as a waiver thereof, nor shall any
single or partial exercise of any right, power or privilege under any of the Loan Documents
preclude any other or further exercise thereof or the exercise of any other right, power or
privilege. The remedies provided herein are cumulative and not exclusive of any remedies provided
by law.

     Section 12.02 Notices. All notices and other communications provided for herein and
in the other Loan Documents (including, without limitation, any modifications of, or waivers or
consents under, this Agreement or the other Loan Documents) shall be given or made in writing by
telex, telecopy, courier or U.S. Mail and telexed, telecopied, mailed or delivered to the intended
recipient at the “Address for Notices” specified below its name on the signature pages hereof or in
the Loan Documents or, as to any party, at such other address as shall be designated by such party
in a notice to each other party. Except as otherwise provided in this Agreement or in the other
Loan Documents, all such communications shall be deemed to have been duly given when transmitted,
if transmitted before 1:00 p.m. local time on a Business Day (otherwise on the next succeeding
Business Day) by telex or telecopier and evidence or confirmation of receipt is

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obtained, or personally delivered or, in the case of a mailed notice, three (3) Business Days
after the date deposited in the mails, postage prepaid, in each case given or addressed as
aforesaid.

     Section 12.03 Payment of Expenses, Indemnities, etc.

     (a) The Borrower agrees:

          (i) whether or not the transactions hereby contemplated are consummated, to pay all
reasonable expenses of the Administrative Agent in the administration (both before and after
the execution hereof and including advice of counsel as to the rights and duties of the
Administrative Agent and the Lenders with respect thereto) of, and in connection with the
negotiation, syndication, investigation, preparation, execution and delivery of, recording
or filing of, preservation of rights under, enforcement of, and refinancing, renegotiation
or restructuring of, the Loan Documents and any amendment, waiver or consent relating
thereto (including, without limitation, travel, photocopy, mailing, courier, telephone and
other similar expenses of the Administrative Agent, the cost of environmental audits,
surveys and appraisals at reasonable intervals, the reasonable fees and disbursements of
counsel and other outside consultants for the Administrative Agent and, in the case of
enforcement, the reasonable fees and disbursements of counsel for the Administrative Agent
and any of the Lenders); and promptly reimburse the Administrative Agent for all amounts
expended, advanced or incurred by the Administrative Agent or the Lenders to satisfy any
obligation of the Borrower under this Agreement or any Security Instrument, including
without limitation, all costs and expenses of foreclosure;

          (ii) To indemnify the Administrative Agent and each Lender and each of
their Affiliates and each of their officers, directors, employees, representatives, agents,
attorneys, accountants and experts (“Indemnified Parties”) from, hold each of them
harmless against and promptly upon demand pay or reimburse each of them for, the Indemnity
Matters which may be incurred by or asserted against or involve any of them (whether or not
any of them is designated a party thereto) as a result of, arising out of or in any way
related to (i) any actual or proposed use by the Borrower of the proceeds of any of the
Loans or Letters of Credit, (ii) the execution, delivery and performance of the Loan
Documents, (iii) the operations of the business of the Borrower and its Subsidiaries, (iv)
the failure of the Borrower or any Subsidiary to comply with the terms of any Security
Instrument or this Agreement, or with any Governmental Requirement, (v) any inaccuracy of
any representation or any breach of any warranty of the Borrower or any Guarantor set forth
in any of the Loan Documents, (vi) the issuance, execution and delivery or transfer of or
payment or failure to pay under any Letter of Credit, or (vii) the payment of a drawing
under any Letter of Credit notwithstanding the non-compliance, non-delivery or other
improper presentation of the manually executed draft(s) and certification(s), (viii) any
assertion that the Lenders were not entitled to receive the proceeds received pursuant to
the Security Instruments or (ix) any other aspect of the Loan

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Documents, including, without limitation, the
reasonable fees and disbursements of counsel and all other expenses incurred in connection
with investigating, defending or preparing to defend any such action, suit, proceeding
(including any investigations, litigation or inquiries) or claim and including all Indemnity
Matters arising by reason of the ordinary negligence of any Indemnified Party, but excluding
all Indemnity Matters arising solely by reason of claims between the Lenders or any Lender
and the Administrative Agent or a Lender’s shareholders against the Administrative Agent or
Lender or by reason of the gross negligence or willful misconduct on the part of any
Indemnified Party; and

          (iii) to indemnify and hold harmless from time to time the Indemnified
Parties from and against any and all losses, claims, cost recovery actions, administrative
orders or proceedings, damages and liabilities to which any such Person may become subject
(i) under any Environmental Law applicable to the Borrower or any Subsidiary or any of their
Properties, including without limitation, the treatment or disposal of hazardous substances
on any of their Properties, (ii) as a result of the breach or non-compliance by the Borrower
or any Subsidiary with any Environmental Law applicable to the Borrower or any Subsidiary,
(iii) due to past ownership by the Borrower or any Subsidiary of any of their Properties or
past activity on any of their Properties which, though lawful and fully permissible at the
time, could result in present liability, (iv) the presence, use, release, storage, treatment
or disposal of hazardous substances on or at any of the Properties owned or operated by the
Borrower or any Subsidiary, or (v) any other environmental, health or safety condition in
connection with the Loan Documents; provided, however, no indemnity shall be
afforded under this section 12.03(a)(iii) in respect of any Property for any occurrence
arising from the acts or omissions of the Administrative Agent or any Lender during the
period after which such Person, its successors or assigns shall have obtained possession of
such Property (whether by foreclosure or deed in lieu of foreclosure, as
mortgagee-in-possession or otherwise).

     (b) No Indemnified Party may settle any claim to be indemnified without the consent of
the Borrower, such consent not to be unreasonably withheld; provided,
however, that the Borrower may not reasonably withhold consent to any settlement
that an Indemnified Party proposes, if the Borrower does not have the financial ability to
pay all its obligations outstanding and asserted against the Borrower at that time,
including the maximum potential claims against the Indemnified Party to be indemnified
pursuant to this Section 12.03.

     (c) In the case of any indemnification hereunder, the Administrative Agent or Lender,
as appropriate shall give notice to the Borrower of any such claim or demand being made
against the Indemnified Party and the Borrower shall have the non exclusive right to join in
the defense against any such claim or demand provided that if the

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Borrower provides a defense, the Indemnified Party shall bear its own cost of defense
unless there is a conflict between the Borrower and such Indemnified Party.

     (d) The foregoing indemnities shall extend to the Indemnified Parties
notwithstanding the sole or concurrent negligence of every kind or character whatsoever,
whether active or passive, whether an affirmative act or an omission, including without
limitation, all types of negligent conduct identified in the restatement (second) of torts
of one or more of the Indemnified Parties or by reason of strict liability imposed without
fault on any one or more of the Indemnified Parties. To the extent that an Indemnified
Party is found to have committed an act of gross negligence or willful misconduct, this
contractual obligation of indemnification shall continue but shall only extend to the
portion of the claim that is deemed to have occurred by reason of events other than the
gross negligence or willful misconduct of the Indemnified Party.

     (e) The Borrower’s obligations under this Section 12.03 shall survive any termination
of this Agreement and the payment of the Notes and shall continue thereafter in full force
and effect.

     (f) The Borrower shall pay any amounts due under this Section 12.03 within thirty (30)
days of the receipt by the Borrower of notice of the amount due.

     Section 12.04 Amendments, Etc. Any provision of this Agreement or any Security
Instrument may be amended, modified or waived with the Borrower’s and the Majority Lenders’ prior
written consent; provided that (i) no amendment, modification or waiver which extends the
final maturity of the Loans, increases the Aggregate Maximum Credit Amounts, increases the
Borrowing Base, forgives the principal amount of any Obligations outstanding under this Agreement,
releases any guarantor of the Obligations or releases all or substantially all of the collateral,
reduces the interest rate applicable to the Loans or the fees payable to the Lenders generally,
affects Section 2.03(a), this Section 12.04 or Section 12.06(a) or modifies the definition of
“Majority Lenders” shall be effective without consent of all Lenders; (ii) no amendment,
modification or waiver which increases the Maximum Credit Amount of any Lender shall be effective
without the consent of such Lender; and (iii) no amendment, modification or waiver which modifies
the rights, duties or obligations of the Administrative Agent shall be effective without the
consent of the Administrative Agent.

     Section 12.05 Successors and Assigns. This Agreement shall be binding upon and inure
to the benefit of the parties hereto and their respective successors and permitted assigns.

     Section 12.06 Assignments and Participations.

     (a) The Borrower may not assign its rights or obligations hereunder or under the Notes
or any Letters of Credit without the prior consent of all of the Lenders and the
Administrative Agent.

     (b) Any Lender may, upon the written consent of the Administrative Agent and, if no
Event of Default has occurred and is continuing, the Borrower (which consent

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will not be unreasonably withheld), assign to one or more assignees all or a portion of
its rights and obligations under this Agreement pursuant to an Assignment Agreement
substantially in the form of Exhibit E (an “Assignment”); provided,
however, that (i) any such assignment of a partial interest in a Note shall be in
the amount of at least $5,000,000 or such lesser amount to which the Borrower has consented;
(ii) the assignee or assignor shall pay to the Administrative Agent a processing and
recordation fee of $3,500 for each assignment and (iii) no consent of the Administrative
Agent of the Borrower shall be required for any assignment by a Lender to any Lender or any
nominee or Affiliate of any Lender. Any such assignment will become effective upon the
execution and delivery to the Administrative Agent of the Assignment and the consent of the
Administrative Agent and, if applicable, the Borrower. Promptly after receipt of an
executed Assignment, the Administrative Agent shall send to the Borrower a copy of such
executed Assignment. Upon receipt of such executed Assignment, the Borrower, will, at its
own expense, execute and deliver new Notes to the assignor and/or assignee, as appropriate,
in accordance with their respective interests as they appear. Upon the effectiveness of any
assignment pursuant to this Section 12.06(b), the assignee will become a “Lender,” if not
already a “Lender,” for all purposes of this Agreement and the Loan Documents. The assignor
shall be relieved of its obligations hereunder to the extent of such assignment (and if the
assigning Lender no longer holds any rights or obligations under this Agreement, such
assigning Lender shall cease to be a “Lender” hereunder except that its rights under
Sections 4.06, 5.01, 5.05 and 12.03 shall not be affected). The Administrative Agent will
prepare on the last Business Day of each month during which an assignment has become
effective pursuant to this Section 12.06(b), a new Annex I giving effect to all such
assignments effected during such month, and will promptly provide the same to the Borrower
and each of the Lenders.

     (c) Each Lender may transfer, grant or assign participations in all or any part of such
Lender’s interests hereunder pursuant to this Section 12.06(c) to any Person,
provided that: (i) such Lender shall remain a “Lender” for all purposes of this
Agreement and the transferee of such participation shall not constitute a “Lender”
hereunder; and (ii) no participant under any such participation shall have rights to approve
any amendment to or waiver of any of the Loan Documents except to the extent such amendment
or waiver would (x) forgive any principal owing on any Obligations or extend the final
maturity of the Loans, (y) reduce the interest rate (other than as a result of waiving the
applicability of any post-default increases in interest rates) or fees applicable to any of
the Commitments or Loans or Letters of Credit in which such participant is participating, or
postpone the payment of any thereof, or (z) release any guarantor of the Obligations or
release all or substantially all of the collateral (except as provided in the Loan
Documents) supporting any of the Commitments or Loans or Letters of Credit in which such
participant is participating. In the case of any such participation, the participant shall
not have any rights under this Agreement or any of the Security Instruments (the
participant’s rights against the granting Lender in respect of such participation to be
those set forth in the agreement with such Lender creating such participation), and all
amounts payable by the Borrower hereunder shall be determined as if such Lender had not sold
such participation, provided that such participant shall be entitled to receive
additional amounts under Article V on the same basis as if it were a Lender and be
indemnified under Section 12.03 as if it were a Lender. In addition, each agreement
creating any

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participation must include an agreement by the participant to be bound by the
provisions of Section 12.15.

     (d) The Lenders may furnish any information concerning the Borrower in the possession
of the Lenders from time to time to assignees and participants (including prospective
assignees and participants); provided that, such Persons agree to be bound by the
provisions of Section 12.15.

     (e) Notwithstanding anything in this Section 12.06 to the contrary, any Lender may
assign and pledge its Note to any Federal Reserve Bank. No such assignment and/or pledge
shall release the assigning and/or pledging Lender from its obligations hereunder.

     (f) Notwithstanding any other provisions of this Section 12.06, no transfer or
assignment of the interests or obligations of any Lender or any grant of participations
therein shall be permitted if such transfer, assignment or grant would require the Borrower
to file a registration statement with the SEC or to qualify the Loans under the “Blue Sky”
laws of any state.

     Section 12.07 Invalidity. In the event that any one or more of the provisions
contained in any of the Loan Documents the Letters of Credit, or the Letter of Credit Agreements
shall, for any reason, be held invalid, illegal or unenforceable in any respect, such invalidity,
illegality or unenforceability shall not affect any other provision of the Notes, this Agreement or
any other Loan Document.

     Section 12.08 Counterparts. This Agreement may be executed in any number of
counterparts, all of which taken together shall constitute one and the same instrument and any of
the parties hereto may execute this Agreement by signing any such counterpart.

     Section 12.09 References; Use of Word “Including”. The words “herein,” “hereof,”
“hereunder” and other words of similar import when used in this Agreement refer to this Agreement
as a whole, and not to any particular article, section or subsection. Any reference herein to a
Section or Article shall be deemed to refer to the applicable Section or Article of this Agreement
unless otherwise stated herein. Any reference herein to an exhibit, schedule, or other attachment
shall be deemed to refer to the applicable exhibit, schedule, or other attachment attached hereto
unless otherwise stated herein. The word “including”, “includes” and words of similar import means
“including, without limitation”.

     Section 12.10 Survival. The obligations of the parties under Section 4.06, Article V,
and Sections 11.05 and 12.03 shall survive the repayment of the Loans and the termination of the
Commitments. To the extent that any payments on the Obligations or proceeds of any collateral are
subsequently invalidated, declared to be fraudulent or preferential, set aside or required to be
repaid to a trustee, debtor in possession, receiver or other Person under any bankruptcy law,
common law or equitable cause, then to such extent, the Obligations so satisfied shall be revived
and continue as if such payment or proceeds had not been received and the Administrative Agent’s
and the Lenders’ Liens, security interests, rights, powers and remedies under this Agreement and
each Security Instrument shall continue in full force and effect. In such event, each Security
Instrument shall be automatically reinstated and the Borrower shall take such

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action as may be reasonably requested by the Administrative Agent and the Lenders to effect
such reinstatement.

     Section 12.11 Captions. Captions and section headings appearing herein are included
solely for convenience of reference and are not intended to affect the interpretation of any
provision of this Agreement.

     Section 12.12 No Oral Agreements. The Loan Documents embody the entire
agreement and understanding between the parties and supersede all other agreements and
understandings between such parties relating to the subject matter hereof and thereof. The Loan
Documents represent the final agreement between the parties and may not be contradicted by evidence
of prior, contemporaneous or subsequent oral agreements of the parties. There are no unwritten
oral agreements between the parties.

     Section 12.13 Governing Law; Submission to Jurisdiction.

     (a) This Agreement and the Notes shall be governed by, and construed in
accordance with, the laws of the State of Texas, except to the extent that United States
federal law permits any Lender to charge interest at the rate allowed by the laws of the
state where such Lender is located. Ch. 346 of the Texas Finance Code (which regulates
certain revolving credit loan accounts and revolving tri-party accounts) shall not apply to
this Agreement or the Notes.

     (b) Any legal action or proceeding with respect to the Loan Documents
shall 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
Borrower hereby accepts for itself and (to the extent permitted by law) in respect of its
Property, generally and unconditionally, the jurisdiction of the aforesaid courts. The
Borrower hereby irrevocably waives any objection, including, without limitation, any
objection to the laying of venue or based on the grounds of forum non conveniens, which it
may now or hereafter have to the bringing of any such action or proceeding in such
respective jurisdictions. This submission to jurisdiction is non-exclusive and does not
preclude the Administrative Agent or any Lender from obtaining jurisdiction over the
Borrower in any court otherwise having jurisdiction.

     (c) The Borrower hereby irrevocably consents to the service of process of
any of the aforementioned courts in any such action or proceeding by the mailing of copies
thereof by registered or certified mail, postage prepaid, to the Borrower at its said
address, such service to become effective thirty (30) days after such mailing. Nothing
herein shall affect the right of the Administrative Agent, any Lender or any holder of a
Note to serve process in any other manner permitted by law or to 

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commence legal proceedings or otherwise proceed against the Borrower or its
Properties in any other jurisdiction.

     (d) The Borrower, the Administrative Agent and each Lender hereby (i)
irrevocably and unconditionally waive, to the fullest extent permitted by law, trial by jury
in any legal action or proceeding relating to this Agreement or any Loan Document and for
any counterclaim therein; (ii) irrevocably waive, to the maximum extent not prohibited by
law, any right it may have to claim or recover in any such litigation any special,
exemplary, punitive or consequential damages, or damages other than, or in addition to,
actual damages; (iii) certify that no party hereto nor any representative, agent or counsel
for any party hereto has represented, expressly or otherwise, or implied that such party
would not, in the event of litigation, seek to enforce the foregoing waivers, and (iv)
acknowledge that it has been induced to enter into this Credit Agreement and the other Loan
Documents and the transactions contemplated hereby and thereby by, among other things, the
mutual waivers and certifications contained in this section 12.13.

     Section 12.14 Interest. It is the intention of the parties hereto that each Lender
shall conform strictly to usury laws applicable to it. Accordingly, if the transactions
contemplated hereby would be usurious as to any Lender under laws applicable to it (including the
laws of the United States of America and the State of 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 any of the Loan
Documents or any agreement entered into in connection with or as security for the Notes, it is
agreed as follows: (i) the aggregate of all consideration which constitutes interest under law
applicable to any Lender that is contracted for, taken, reserved, charged or received by such
Lender under any of the Loan Documents or agreements or otherwise in connection with the Notes
shall under no circumstances exceed the maximum amount allowed by such applicable law, and any
excess shall be canceled automatically and if theretofore paid shall be credited by such Lender on
the principal amount of the Obligations (or, to the extent that the principal amount of the
Obligations shall have been or would thereby be paid in full, refunded by such Lender to the
Borrower); and (ii) in the event that the maturity of the Notes is accelerated by reason of an
election of the holder thereof resulting from any Event of Default under this Agreement or
otherwise, or in the event of any required or permitted prepayment, then such consideration that
constitutes interest under law applicable to any Lender may never include more than the maximum
amount allowed by such applicable law, and excess interest, if any, provided for in this Agreement
or otherwise shall be canceled automatically by such Lender as of the date of such acceleration or
prepayment and, if theretofore paid, shall be credited by such Lender on the principal amount of
the Obligations (or, to the extent that the principal amount of the Obligations shall have been or
would thereby be paid in full, refunded by such Lender to the Borrower). All sums paid or agreed
to be paid to any Lender for the use, forbearance or detention of sums due hereunder shall, to the
extent permitted by law applicable to such Lender, be amortized, prorated, allocated and spread
throughout the full term of the Loans evidenced by the Notes until payment in full so that the rate
or amount of interest on account of any Loans hereunder does not exceed the maximum amount allowed
by such applicable law. If at any time and from time to time (i) the amount of interest payable to

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any Lender on any date shall be computed at the Highest Lawful Rate applicable to such Lender
pursuant to this Section 12.14 and (ii) in respect of any subsequent interest computation period
the amount of interest otherwise payable to such Lender would be less than the amount of interest
payable to such Lender computed at the Highest Lawful Rate applicable to such Lender, then the
amount of interest payable to such Lender in respect of such subsequent interest computation period
shall continue to be computed at the Highest Lawful Rate applicable to such Lender until the total
amount of interest payable to such Lender shall equal the total amount of interest which would have
been payable to such Lender if the total amount of interest had been computed without giving effect
to this Section 12.14. To the extent that Chapter 303 of the Texas Finance Code is relevant for
the purpose of determining the Highest Lawful Rate, such Lender elects to determine the applicable
rate ceiling under such Chapter by the weekly ceiling from time to time in effect.

     Section 12.15 Confidentiality. In the event that the Borrower or any Subsidiary
provides to the Administrative Agent or the Lenders confidential information belonging to the
Borrower or such Subsidiary, which the Borrower or any Subsidiary shall designate in writing as
“confidential”, the Administrative Agent and the Lenders shall thereafter maintain such information
in confidence in accordance with the standards of care and diligence that each utilizes in
maintaining its own confidential information. This obligation of confidence shall not apply to
such portions of the information which (i) are in the public domain, (ii) hereafter become part of
the public domain without the Administrative Agent or the Lenders breaching their obligation of
confidence to the Borrower, (iii) are previously known by the Administrative Agent or the Lenders
from some source other than the Borrower, (iv) are hereafter developed by the Administrative Agent
or the Lenders without using the Borrower’s information, (v) are hereafter obtained by or available
to the Administrative Agent or the Lenders from a third party who owes no obligation of confidence
to the Borrower with respect to such information or through any other means other than through
disclosure by the Borrower, (vi) are disclosed with the Borrower’s consent, (vii) must be disclosed
either pursuant to any Governmental Requirement or to Persons regulating the activities of the
Administrative Agent or the Lenders, or (viii) as may be required by law or regulation or order of
any Governmental Authority in any judicial, arbitration or governmental proceeding. Further, the
Administrative Agent or a Lender may disclose any such information to any other Lender, any
Affiliate of any Lender, any independent petroleum engineers or consultants, any independent
certified public accountants, any legal counsel employed by such Person in connection with this
Agreement or any Security Instrument, including without limitation, the enforcement or exercise of
all rights and remedies thereunder, or any assignee or participant (including prospective assignees
and participants) in the Loans; provided, however, that the Administrative Agent or
the Lenders shall receive a confidentiality agreement from the Person to whom such information is
disclosed such that said Person shall have the same obligation to maintain the confidentiality of
such information as is imposed upon the Administrative Agent or the Lenders hereunder.
Notwithstanding anything to the contrary provided herein, this obligation of confidence shall cease
three (3) years from the date the information was furnished, unless the Borrower requests in
writing at least thirty (30) days prior to the expiration of such three year period, to maintain
the confidentiality of such information for an additional three year period. The Borrower waives
any and all other rights it may have to confidentiality as against the Administrative Agent and the
Lenders arising by contract, agreement, statute or law except as expressly stated in this Section
12.15.

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     Section 12.16 Exculpation Provisions. Each of the parties hereto
specifically agrees that it has a duty to read this Agreement and the Security Instruments and
agrees that it is charged with notice and knowledge of the terms of this Agreement and the 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 Security Instruments; and has received the advice of its attorney in entering
into this Agreement and the Security Instruments; and that it recognizes that certain of the terms
of this Agreement and the 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 Security Instruments on the
basis that the party had no notice or knowledge of such provision or that the provision is not
“conspicuous.”

     Section 12.17 Hedging Agreement Substitution of Collateral. If the Obligations are
paid in full and this Agreement is terminated, the Administrative Agent and the Lenders shall
execute and deliver or cause to be executed and delivered such instruments of satisfaction and
reassignment as may be appropriate in order to release all liens and security interests created by
the Security Instruments, provided, however, that in lieu of paying off any such
Obligations arising under any Hedging Agreement with any Lender or Affiliate of any Lender, the
Borrower may provide substitute credit support under a standard form ISDA Credit Support Annex
acceptable to such Lender (or its Affiliate) in the form of a letter of credit or cash equivalents
in an amount equal to 110% of the then current exposure under such Hedging Agreement.

     Section 12.18 Amendment, Restatement and Rearrangement of Prior Debt. The parties
hereto agree that this Agreement amends, restates and rearranges the Prior Credit Agreement in its
entirety and that all Loans and all Existing Letters of Credit outstanding under the Prior Credit
Agreement on the Closing Date shall be and be deemed to be Loans (of the same Type and having the
same Interest Periods) made and Letters of Credit issued under this Agreement, and shall thereafter
be evidenced and governed by the terms and conditions of this Agreement.

     Section 12.19 Obligations as Senior Indebtedness; Specified Senior Indebtedness. It
is the intent of all the parties hereto that all of the Obligations arising under this Agreement
and the other Loan Documents shall constitute (and to the extent, if any, required are hereby
designated by Borrower to constitute) “Senior Indebtedness” and “Specified Senior Indebtedness” as
such terms are defined in the indentures governing the Existing Other Debt. This Agreement and the
other Loan Documents represent the “Credit Facility” or the “Senior Secured Credit Facility”, as
the case may be, as defined in the indentures governing the Existing Other Debt. Notwithstanding
the foregoing, the acknowledgment of intent contained in this Section 12.19 shall not be deemed to
modify or amend any provision of this Agreement or any of the other Loan Documents.

[SIGNATURES BEGIN ON NEXT PAGE]

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

	 	 	 	 	 	 	 
	BORROWER:	 	CALLON PETROLEUM COMPANY	 	 
	 
	 	 	 	 	 	 
	 

	 	By:	 	/s/ Rodger W. Smith, Jr.	 	 
	 

	 	 	 	 

          Rodger W. Smith, Jr.
	 	 
	 

	 	 	 	          Treasurer	 	 
	 
	 	 	 	 	 	 
	 	 	Address for Notices:	 	 
	 
	 	 	 	 	 	 
	 	 	P.O. Box 1287, Natchez, MS 39121 1287;	 	 
	 
	 	 	 	 	 	 
	 	 	or	 	 
	 
	 	 	 	 	 	 
	 	 	200 North Canal Street, Natchez, MS 39120	 	 
	 	 	Telecopier No.: 601 446 1410	 	 
	 	 	Telephone No.: 601 442 1601	 	 
	 	 	Attention: Rodger W. Smith, Treasurer	 	 

 

 

	 	 	 	 	 	 	 
	ADMINISTRATIVE AGENT
	 	 	 	 	 	 
	and LENDER:	 	UNION BANK OF CALIFORNIA, N.A., individually	 	 
	 	 	and as Administrative Agent	 	 
	 
	 	 	 	 	 	 
	 

	 	By:	 	/s/ Damien Meiburger	 	 
	 

	 	 	 	 

          Damien Meiburger
	 	 
	 

	 	 	 	          Senior Vice President	 	 

	 	 	 
	 

	 	Lending Office for Base Rate Loans and LIBOR
	 

	 	Loans:
	 
	 	 
	 

	 	1980 Saturn Street, Mail Code V01-120
	 

	 	Monterey Park, CA 91754
	 

	 	Telephone: (323) 720-2870
	 

	 	Telecopy: (323) 724-6198 and (323) 724-0042
	 

	 	Attention: Silvia Cruz, Commercial Loan
	 

	 	Operations Department

	 

	 	Email: #clo_synd @uboc.com
	 
	 	 
	 

	 	Address for Notices:
	 
	 	 
	 

	 	Energy Capital Services — Dallas Office
	 

	 	500 N. Akard, Suite 4200
	 

	 	Dallas, TX 75201
	 

	 	Telecopier No.: (214) 922 4209
	 

	 	Telephone No.: (214) 922 4200
	 

	 	Attention: Damien Meiburger
	 
	 	 
	 

	 	With copy to:
	 
	 	 
	 

	 	Energy Capital Services — Dallas Office
	 

	 	500 N. Akard, Suite 4200
	 

	 	Dallas, TX 75201
	 

	 	Telecopier No.: (214) 922 4209
	 

	 	Telephone No.: (214) 922 4200
	 

	 	Attention: Hannah Payne

 

 

	 	 	 	 	 	 	 
	LENDER:	 	GUARANTY BANK	 	 
	 
	 	 	 	 	 	 
	 

	 	By:	 	 	 	 
	 

	 	Name:
	 	 

	 	 
	 

	 	Title:
	 	 

	 	 
	 

	 	 	 	 

	 	 
	 
	 	 	 	 	 	 
	 	 	Lending Office for Base Rate Loans and LIBOR	 	 
	 	 	Loans:	 	 

	 	 	 	 	 	 	 
	 	 	 	 	 
	 
	 	 	 	 	 	 
	 	 	 	 	 
	 
	 	 	 	 	 	 
	 	 	 	 	 
	 

	 	Telecopier No.:	 	 	 	 
	 

	 	 	 	 

	 	 
	 

	 	Telephone No.:	 	 	 	 
	 

	 	 	 	 

	 	 
	 

	 	Attention:	 	 	 	 
	 

	 	 	 	 

	 	 
	 
	 	 	 	 	 	 
	 	 	Address for Notices:	 	 
	 
	 	 	 	 	 	 
	 	 	 	 	 
	 
	 	 	 	 	 	 
	 	 	 	 	 
	 
	 	 	 	 	 	 
	 	 	 	 	 
	 

	 	Telecopier No.:	 	 	 	 
	 

	 	 	 	 

	 	 
	 

	 	Telephone No.:	 	 	 	 
	 

	 	 	 	 

	 	 
	 

	 	Attention:	 	 	 	 
	 

	 	 	 	 

	 	 

 

 

	 	 	 	 	 	 	 
	LENDER:	 	NATEXIS BANQUES POPULAIRES	 	 
	 
	 	 	 	 	 	 
	 

	 	By:	 	 	 	 
	 

	 	Name:
	 	 

	 	 
	 

	 	Title:
	 	 

	 	 
	 

	 	 	 	 

	 	 
	 
	 	 	 	 	 	 
	 	 	Lending Office for Base Rate Loans and LIBOR	 	 
	 	 	Loans:	 	 

	 	 	 	 	 	 	 
	 	 	 	 	 
	 
	 	 	 	 	 	 
	 	 	 	 	 
	 
	 	 	 	 	 	 
	 	 	 	 	 
	 

	 	Telecopier No.:	 	 	 	 
	 

	 	 	 	 

	 	 
	 

	 	Telephone No.:	 	 	 	 
	 

	 	 	 	 

	 	 
	 

	 	Attention:	 	 	 	 
	 

	 	 	 	 

	 	 
	 
	 	 	 	 	 	 
	 	 	Address for Notices:	 	 
	 
	 	 	 	 	 	 
	 	 	 	 	 
	 
	 	 	 	 	 	 
	 	 	 	 	 
	 
	 	 	 	 	 	 
	 	 	 	 	 
	 

	 	Telecopier No.:	 	 	 	 
	 

	 	 	 	 

	 	 
	 

	 	Telephone No.:	 	 	 	 
	 

	 	 	 	 

	 	 
	 

	 	Attention:	 	 	 	 
	 

	 	 	 	 

	 	 

 

 

CONSENT OF GUARANTORS

     Each Guarantor hereby consents and agrees to the terms of this Agreement and agrees that each
and every guaranty executed in connection with this Agreement shall be legal, valid, and binding
obligations of each Guarantor enforceable against each Guarantor in accordance with its terms.

     WITNESS THE EXECUTION HEREOF, as of the ___th day of August, 2006.

CALLON PETROLEUM OPERATING COMPANY,

           a Delaware corporation

CALLON OFFSHORE PRODUCTION, INC.,

          a Mississippi corporation

MISSISSIPPI MARKETING, INC.,

          a Mississippi corporation

CALLON MINERAL PROPERTIES, INC.,

          a Mississippi corporation

	 	 	 	 	 	 	 
	 

	 	Each By:	 	/s/ Rodger W. Smith, Jr.	 	 
	 

	 	 	 	 

          Rodger W. Smith, Jr.
	 	 
	 

	 	 	 	          Treasurer	 	 

 

 

ANNEX I

LIST OF PERCENTAGE SHARES AND 

MAXIMUM CREDIT AMOUNTS

	 	 	 	 	 	 	 	 	 
	 	 	Percentage	 	 
	Name of Lender	 	Share	 	Maximum Credit Amount
	Union Bank of California, N.A.
	 	 	41.666666667	%	 	$	72,916,666.67	 
	Guaranty Bank
	 	 	41.666666667	%	 	$	72,916,666.67	 
	Natexis Banques Populaires
	 	 	16.666666666	%	 	$	29,166,666.66	 
	TOTAL
	 	 	100	%	 	$	175,000,000	 

 

 

EXHIBIT A

FORM OF NOTE

			
	 	 	 
	$                                                            
	 	                                        , 200___

     FOR VALUE RECEIVED, CALLON PETROLEUM COMPANY, a Delaware corporation (the “Borrower”)
hereby promises to pay to the order of                                          (the “Lender”), at
the Principal Office of Union Bank of California, N.A. (the “Administrative Agent”), at 445
South Figueroa Street, Los Angeles, California 90071, the principal sum of                      Dollars
($                    ) (or such lesser amount as shall equal the aggregate unpaid principal amount of the
Loans made by the Lender to the Borrower under the Credit Agreement, as hereinafter defined), in
lawful money of the United States of America and in immediately available funds, on the dates and
in the principal amounts provided in the Credit Agreement, and to pay interest on the unpaid
principal amount of each such Loan, at such office, in like money and funds, for the period
commencing on the date of such Loan until such Loan shall be paid in full, at the rates per annum
and on the dates provided in the Credit Agreement.

     The date, amount, Type, interest rate, Interest Period and maturity of each Loan made by the
Lender to the Borrower, and each payment made on account of the principal thereof, shall be
recorded by the Lender on its books and, prior to any transfer of this Note, endorsed by the Lender
on the schedules attached hereto or any continuation thereof.

     This Note is one of the Notes referred to in the Amended and Restated Credit Agreement dated
as of August ___, 2006 among the Borrower, the Lenders which are or become parties thereto
(including the Lender) and the Administrative Agent (as the same may be amended or supplemented
from time to time, the “Credit Agreement”), and evidences Loans made by the Lender
thereunder. Capitalized terms used in this Note have the respective meanings assigned to them in
the Credit Agreement.

     This Note is issued pursuant to the Credit Agreement and is entitled to the benefits provided
for in the Credit Agreement and the Loan Documents. The Credit Agreement provides for the
acceleration of the maturity of this Note upon the occurrence of certain events, for prepayments of
Loans upon the terms and conditions specified therein and other provisions relevant to this Note.

     This Note represents the renewal, extension and rearrangement, but not a novation, of the
indebtedness evidenced by that certain $175,000,000.00 Note dated August ___, 2004 executed by the
Borrower and payable to the order of the Lender.

     THIS NOTE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF
TEXAS.

	 	 	 	 	 
	 	CALLON PETROLEUM COMPANY

 	 
	 	By:  	 	 

	 	 	 	 	 
	 	 Name:

Title:

 	 
	 	 	 
	 	 	 
	 	 	 
	 

 

 

EXHIBIT B

FORM OF BORROWING, CONTINUATION AND CONVERSION REQUEST

                                                            , 200___

     CALLON PETROLEUM COMPANY, a Delaware corporation (the “Borrower”), pursuant to the Amended and
Restated Credit Agreement dated as of August ___, 2006 among the Borrower, UNION BANK OF CALIFORNIA,
N.A., as Administrative Agent for the lenders (the “Lenders”) which are or become parties thereto,
and such Lenders (together with all amendments or supplements thereto, the “Credit Agreement”),
hereby makes the requests indicated below (unless otherwise defined herein, capitalized terms are
defined in the Credit Agreement):

	 ̈	1.	 	Loans:
	 
	 	(a)	 	Aggregate amount of new Loans to be $                                        ;
	 
	 	(b)	 	Requested funding date is                     , 200___;
	 
	 	(c)	 	$                                         of such borrowings are to be LIBOR Loans;
	 
	 	 	 	$                                         of such borrowings are to be Base Rate Loans; and
	 
	 	(d)	 	Length of Interest Period for LIBOR Loans is:                                         .
	 
	 ̈	2.	 	LIBOR Loan Continuation for LIBOR Loans maturing on                                         :
	 
	 	(a)	 	Aggregate amount to be continued as LIBOR Loans is $                                        ;
	 
	 	(b)	 	Aggregate amount to be converted to Base Rate Loans is $                                        ;
	 
	 	(c)	 	Length of Interest Period for continued LIBOR Loans is                                         .
	 
	 ̈	3.	 	Conversion of Outstanding Base Rate Loans to LIBOR Loans:
	 
	 	 	 	Convert $                                         of the outstanding Base Rate Loans to LIBOR Loans on
                                         with an Interest Period of                                         .
	 
	 ̈	4.	 	Conversion of outstanding LIBOR Loans to Base Rate Loans:
	 
	 	 	 	Convert $                                         of the outstanding LIBOR Loans with Interest Period
maturing on                                         , 200_, to Base Rate Loans.

     The undersigned certifies that he is the                                          of the Borrower, and that as
such he is authorized to execute this certificate on behalf of the Borrower. The undersigned
further certifies, represents and warrants on behalf of the Borrower that the

 

 

Borrower is entitled to receive the requested borrowing, continuation or conversion under the
terms and conditions of the Credit Agreement.

	 	 	 	 	 	 	 
	 	 	CALLON PETROLEUM COMPANY
	 
	 	 	 	 	 	 
	 

	 	By:	 	 	 	 
	 

	 	 	 	 	 	 
	 	 	Name:
	 	 	Title:  

 

 

EXHIBIT C

FORM OF COMPLIANCE CERTIFICATE

     The undersigned hereby certifies that he is the                                          of CALLON PETROLEUM COMPANY,
a Delaware corporation (the “Borrower”) and that as such he is authorized to execute this
certificate on behalf of the Borrower. With reference to the Amended and Restated Credit Agreement
dated as of August ___, 2006 among the Borrower, UNION BANK OF CALIFORNIA, N.A., as Administrative
Agent for the lenders (the “Lenders”) which are or become a party thereto, and such Lenders
(together with all amendments or supplements thereto being the “Credit Agreement”), the
undersigned represents and warrants as follows (each capitalized term used herein having the same
meaning given to it in the Credit Agreement unless otherwise specified):

     (a) The representations and warranties of the Borrower contained in Article VII
of the Credit Agreement and in the Security Instruments and otherwise made in
writing by or on behalf of the Borrower pursuant to the Credit Agreement and the
Security Instruments were true and correct when made, and are repeated at and as of
the time of delivery hereof and are true and correct at and as of the time of
delivery hereof, except to the extent any such representations and warranties are
expressly limited to an earlier date or the Majority Lenders have expressly
consented in writing to the contrary.

     (b) The Borrower has performed and complied with all agreements and conditions
contained in the Credit Agreement and in the Security Instruments required to be
performed or complied with by it prior to or at the time of delivery hereof.

     (c) Since                                         , no change has occurred, either in any case or in
the aggregate, in the condition, financial or otherwise, of the Borrower or any
Subsidiary which would have a Material Adverse Effect.

     (d) There exists, and, after giving effect to the loan or loans with respect to
which this certificate is being delivered, will exist, no Default under the Credit
Agreement.

     (e) The financial statements furnished to the Administrative Agent with this
certificate fairly present the consolidated financial condition and results of
operations of the Borrower and its Consolidated Subsidiaries as at the end of, and
for, the [fiscal quarter] [fiscal year] ending                                                              and such
financial statements have been prepared in accordance with the accounting procedures
specified in the Credit Agreement.

     (f) Attached hereto are the detailed computations necessary to determine
whether the Borrower and its Consolidated Subsidiaries are in compliance with
Sections 9.12, 9.13, and 9.14 of the Credit Agreement as of the end of the [fiscal
quarter] [fiscal year] ending                                                             .

 

 

     EXECUTED AND DELIVERED this ___ day of                                         .

	 	 	 	 	 	 	 
	 	 	CALLON PETROLEUM COMPANY
	 
	 	 	 	 	 	 
	 

	 	By:	 	 	 	 
	 

	 	 	 	 	 	 
	 	 	Name:
	 	 	Title:  

 

 

EXHIBIT D

SECURITY INSTRUMENTS

	1.	 	Reaffirmation of Guaranties and Security Agreements executed by Borrower, Callon Petroleum
Operating Company, Callon Offshore Production, Inc., Mississippi Marketing, Inc., Callon
Mineral Properties, Inc.

	2.	 	Mortgage, Deed of Trust, Security Agreement, Fixture Filing and Financing Statement (Texas)
executed by Borrower and Callon Petroleum Operating Company, and UCC-1 Financing Statements
related thereto.

	3.	 	First Amendment to Act of Mortgage, Security Agreement, Fixture Filing and Financing
Statement (Louisiana) executed by Borrower and Callon Petroleum Operating Company, and UCC-1
Financing Statements related thereto.

 

 

EXHIBIT E

FORM OF ASSIGNMENT AGREEMENT

     ASSIGNMENT AGREEMENT (“Agreement”) dated as of                     , 200___between:
                                                             (the “Assignor”) and                                                             
(the “Assignee”).

RECITALS

     A. The Assignor is a party to the Amended and Restated Credit Agreement dated as of August ___,
2006 (as amended and supplemented and in effect from time to time, the “Credit Agreement”)
among CALLON PETROLEUM COMPANY, a Delaware corporation (the “Borrower”), each of the
lenders that is or becomes a party thereto as provided in Section 12.06 of the Credit Agreement
(individually, together with its successors and assigns, a “Lender”, and collectively,
together with their successors and assigns, the “Lenders”), and UNION BANK OF CALIFORNIA,
N.A., in its individual capacity, (“UBOC”) and as agent for the Lenders (in such capacity,
together with its successors in such capacity, the “Administrative Agent”).

     B. The Assignor proposes to sell, assign and transfer to the Assignee, and the Assignee
proposes to purchase and assume from the Assignor, [all][a portion] of the Assignor’s Maximum
Credit Amount, outstanding Loans and its Percentage Share of the outstanding LC Exposure, all on
the terms and conditions of this Agreement.

     C. In consideration of the foregoing and the mutual agreements contained herein, and for other
good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the
parties hereto agree as follows:

ARTICLE I

Definitions.

     Section 1.01 Definitions. All capitalized terms used but not defined herein have the
respective meanings given to such terms in the Credit Agreement.

     Section 1.02 Other Definitions. As used herein, the following terms have the
following respective meanings:

     “Assigned Interest” shall mean all of Assignor’s (in its capacity as a
“Lender”) rights and obligations (i) under the Credit Agreement and the
other Security Instruments in respect of the Maximum Credit Amount of the Assignor
in the principal amount equal to $                    , including, without
limitation, any obligation to participate pro rata in any LC Exposure, and any
obligation to participate pro rata in any LC Exposure and (ii) to make Loans under
the Maximum Credit Amount and any right to receive payments for the Loans
outstanding under the Maximum Credit Amount assigned hereby of equal
to$                     (the “Loan Balance”), plus the interest and fees which
will accrue from and after the Assignment Date.

 

 

     “Assignment Date” shall mean                     , 200___.

ARTICLE II

Sale and Assignment.

     Section 2.01 Sale and Assignment. On the terms and conditions set forth herein,
effective on and as of the Assignment Date, the Assignor hereby sells, assigns and transfers to the
Assignee, and the Assignee hereby purchases and assumes from the Assignor, all of the right, title
and interest of the Assignor in and to, and all of the obligations of the Assignor in respect of,
the Assigned Interest. Such sale, assignment and transfer is without recourse and, except as
expressly provided in this Agreement, without representation or warranty.

     Section 2.02 Assumption of Obligations. The Assignee agrees with the Assignor (for
the express benefit of the Assignor and the Borrower) that the Assignee will, from and after the
Assignment Date, perform all of the obligations of the Assignor in respect of the Assigned
Interest. From and after the Assignment Date: (a) the Assignor shall be released from the
Assignor’s obligations in respect of the Assigned Interest, and (b) the Assignee shall be entitled
to all of the Assignor’s rights, powers and privileges under the Credit Agreement and the other
Security Instruments in respect of the Assigned Interest.

     Section 2.03 Consent by Administrative Agent [and the Borrower]. By executing this
Agreement as provided below, in accordance with Section 12.06(b) of the Credit Agreement, the
Administrative Agent [and the Borrower] hereby acknowledge[s] notice of the transactions
contemplated by this Agreement and consents to such transactions.

ARTICLE III

Payments.

     Section 3.01 Payments. As consideration for the sale, assignment and transfer
contemplated by Section 2.01 hereof, the Assignee shall, on the Assignment Date, assume Assignor’s
obligations in respect of the Assigned Interest and pay to the Assignor an amount equal to the Loan
Balance, if any. An amount equal to all accrued and unpaid interest and fees shall be paid to the
Assignor as provided in Section 3.02 (iii) below. Except as otherwise provided in this Agreement,
all payments hereunder shall be made in Dollars and in immediately available funds, without setoff,
deduction or counterclaim.

     Section 3.02 Allocation of Payments. The Assignor and the Assignee agree that (i) the
Assignor shall be entitled to any payments of principal with respect to the Assigned Interest made
prior to the Assignment Date, together with any interest and fees with respect to the Assigned
Interest accrued prior to the Assignment Date, (ii) the Assignee shall be entitled to any payments
of principal with respect to the Assigned Interest made from and after the Assignment Date,
together with any and all interest and fees with respect to the Assigned Interest accruing from and
after the Assignment Date, and (iii) the Administrative Agent is authorized and instructed to
allocate payments received by it for account of the Assignor and the Assignee as provided in the
foregoing clauses. Each party hereto agrees that it will hold any interest, fees or
other amounts that it may receive to which the other party hereto shall be entitled pursuant
to the

 

 

preceding sentence for account of such other party and pay, in like money and funds, any
such amounts that it may receive to such other party promptly upon receipt.

     Section 3.03 Delivery of Notes. Promptly following the receipt by the Assignor of the
consideration required to be paid under Section 3.01 hereof, the Assignor shall, in the manner
contemplated by Section 12.06(b) of the Credit Agreement, (i) deliver to the Administrative Agent
(or its counsel) the Note[s] held by the Assignor and (ii) notify the Administrative Agent to
request that the Borrower execute and deliver new Notes to the Assignor, if Assignor continues to
be a Lender, and the Assignee, dated the date of this Agreement in respective principal amounts
equal to the respective [Maximum Credit Amounts][Commitments] of the Assignor (if appropriate) and
the Assignee after giving effect to the sale, assignment and transfer contemplated hereby.

     Section 3.04 Further Assurances. The Assignor and the Assignee hereby agree to
execute and deliver such other instruments, and take such other actions, as either party may
reasonably request in connection with the transactions contemplated by this Agreement.

ARTICLE IV

Conditions Precedent.

     Section 4.01 Conditions Precedent. The effectiveness of the sale, assignment and
transfer contemplated hereby is subject to the satisfaction of each of the following conditions
precedent:

     (a) the execution and delivery of this Agreement by the Assignor and the Assignee;

     (b) the receipt by the Assignor of the payment required to be made by the Assignee
under Section 3.01 hereof; and

     (c) the acknowledgment and consent by the Administrative Agent contemplated by Section
2.03 hereof.

ARTICLE V

Representations and Warranties.

     Section 5.01 Representations and Warranties of the Assignor. The Assignor represents
and warrants to the Assignee as follows:

     (a) it has all requisite power and authority, and has taken all action necessary to
execute and deliver this Agreement and to fulfill its obligations under, and consummate the
transactions contemplated by, this Agreement;

     (b) the execution, delivery and compliance with the terms hereof by Assignor and the
delivery of all instruments required to be delivered by it hereunder do not and will not
violate any Governmental Requirement applicable to it;

 

 

     (c) this Agreement has been duly executed and delivered by it and constitutes the
legal, valid and binding obligation of the Assignor, enforceable against it in accordance
with its terms;

     (d) all approvals and authorizations of, all filings with and all actions by any
Governmental Authority necessary for the validity or enforceability of its obligations under
this Agreement have been obtained;

     (e) the Assignor has good title to, and is the sole legal and beneficial owner of, the
Assigned Interest, free and clear of all Liens, claims, participations or other charges of
any nature whatsoever; and

     (f) the transactions contemplated by this Agreement are commercial banking transactions
entered into in the ordinary course of the banking business of the Assignor.

     Section 5.02 Disclaimer. Except as expressly provided in Section 5.01 hereof, the
Assignor does not make any representation or warranty, nor shall it have any responsibility to the
Assignee, with respect to the accuracy of any recitals, statements, representations or warranties
contained in the Credit Agreement or in any certificate or other document referred to or provided
for in, or received by any Lender under, the Credit Agreement, or for the value, validity,
effectiveness, genuineness, execution, effectiveness, legality, enforceability or sufficiency of
the Credit Agreement, the Notes or any other document referred to or provided for therein or for
any failure by the Borrower or any other Person (other than Assignor) to perform any of its
obligations thereunder prior or for the existence, value, perfection or priority of any collateral
security or the financial or other condition of the Borrower or the Subsidiaries [or any other
obligor or guarantor], or any other matter relating to the Credit Agreement or any other Security
Instrument or any extension of credit thereunder.

     Section 5.03 Representations and Warranties of the Assignee. The Assignee represents
and warrants to the Assignor as follows:

     (a) it has all requisite power and authority, and has taken all action necessary to
execute and deliver this Agreement and to fulfill its obligations under, and consummate the
transactions contemplated by, this Agreement;

     (b) the execution, delivery and compliance with the terms hereof by Assignee and the
delivery of all instruments required to be delivered by it hereunder do not and will not
violate any Governmental Requirement applicable to it;

     (c) this Agreement has been duly executed and delivered by it and constitutes the
legal, valid and binding obligation of the Assignee, enforceable against it in accordance
with its terms;

     (d) all approvals and authorizations of, all filings with and all actions by any
Governmental Authority necessary for the validity or enforceability of its obligations under
this Agreement have been obtained;

 

 

     (e) the Assignee has fully reviewed the terms of the Credit Agreement and the other
Security Instruments and has independently and without reliance upon the Assignor, and based
on such information as the Assignee has deemed appropriate, made its own credit analysis and
decision to enter into this Agreement;

     (f) the Assignee hereby affirms that the representations contained in Section
4.06(d)[(i)][ii)] of the Credit Agreement are true and accurate as to it [IF (ii) IS
SELECTED ADD: and, the Assignee has contemporaneously herewith delivered to the
Administrative Agent and the Borrower such certifications as are required thereby to avoid
the withholding taxes referred to in Section 4.06]; and

     (g) the transactions contemplated by this Agreement are commercial banking transactions
entered into in the ordinary course of the lending business of the Assignee.

ARTICLE VI

Miscellaneous.

     Section 6.01 Notices. All notices and other communications provided for herein
(including, without limitation, any modifications of, or waivers, requests or consents under, this
Agreement) shall be given or made in writing (including, without limitation, by telex or telecopy)
to the intended recipient at its “Address for Notices” specified below its name on the signature
pages hereof or, as to either party, at such other address as shall be designated by such party in
a notice to the other party.

     Section 6.02 Amendment, Modification or Waiver. No provision of this Agreement may be
amended, modified or waived except by an instrument in writing signed by the Assignor and the
Assignee, and consented to by the Administrative Agent.

     Section 6.03 Successors and Assigns. This Agreement shall be binding upon and inure
to the benefit of the parties hereto and their respective successors and permitted assigns. The
representations and warranties made herein by the Assignee are also made for the benefit of the
Administrative Agent and the Borrower, and the Assignee agrees that the Administrative Agent and
the Borrower are entitled to rely upon such representations and warranties.

     Section 6.04 Assignments. Neither party hereto may assign any of its rights or
obligations hereunder except in accordance with the terms of the Credit Agreement.

     Section 6.05 Captions. The captions and section headings appearing herein are
included solely for convenience of reference and are not intended to affect the interpretation of
any provision of this Agreement.

     Section 6.06 Counterparts. This Agreement may be executed in any number of
counterparts, each of which shall be identical and all of which, taken together, shall constitute
one and the same instrument, and each of the parties hereto may execute this Agreement by
signing any such counterpart.

 

 

     Section 6.07 Governing Law. This Agreement shall be governed by, and construed in
accordance with, the law of the State of Texas.

     Section 6.08 Expenses. To the extent not paid by the Borrower pursuant to the terms
of the Credit Agreement, each party hereto shall bear its own expenses in connection with the
execution, delivery and performance of this Agreement.

     Section 6.09 Waiver of Jury Trial. EACH OF THE PARTIES HERETO HEREBY IRREVOCABLY
WAIVES, TO THE FULLEST EXTENT PERMITTED BY LAW, ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL
PROCEEDING ARISING OUT OF OR RELATING TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY.

     IN WITNESS WHEREOF, the parties hereto have caused this Assignment Agreement to be executed
and delivered as of the date first above written.

	 	 	 	 	 	 	 
	 	 	ASSIGNOR:
	 
	 	 	 	 	 	 
	 

	 	By:	 	 	 	 
	 

	 	 	 	 	 	 
	 	 	Name:
	 	 	Title:
	 
	 	 	 	 	 	 
	 	 	Address for Notices:
	 
	 	 	 	 	 	 
	 	 	Telecopier No.:
	 	 	Telephone No.:
	 	 	Attention:
	 
	 	 	 	 	 	 
	 	 	ASSIGNEE:
	 
	 	 	 	 	 	 
	 

	 	By:	 	 	 	 
	 

	 	 	 	 	 	 
	 	 	Name:
	 	 	Title:
	 
	 	 	 	 	 	 
	 	 	Address for Notices:
	 
	 	 	 	 	 	 
	 	 	Telecopier No.:
	 	 	Telephone No.:
	 	 	Attention:  

 

 

	 	 	 	 	 	 	 
	ACKNOWLEDGED AND CONSENTED TO:
	 
	 	 	 	 	 	 
	 

	 	 	,	 	 	 
	 	 	 	 	 
	as Administrative Agent
	 
	 	 	 	 	 	 
	By:
	 	 	 	 	 	 
	 

	 	 	 	 	 	 
	Name:
	Title:
	 
	 	 	 	 	 	 
	[CALLON PETROLEUM COMPANY]
	 
	 	 	 	 	 	 
	By:
	 	 	 	 	 	 
	 

	 	 	 	 	 	 
	Name:
	Title:

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