Document:

exv10w1

 

Exhibit 10.1

ANADARKO PETROLEUM CORPORATION

Fixed Rate Note Due 2038

$                    

     ANADARKO PETROLEUM CORPORATION, a Delaware corporation (herein called the “Company”, which
term includes any successor person), for value received, hereby promises to pay to Western Gas
Partners, LP (“Western”), or registered assigns, the principal sum of                      ( $                     ) on                     ,
                     2038 (the
“Maturity Date”) , and to pay accrued but unpaid interest on the unpaid principal amount from                     ,                     
2008 through repayment, quarterly on each February 1, May 1, August 1 and November 1, at a rate per
annum equal to six percent (6%).

     Interest payable hereunder shall be computed on the basis of a year of 360 days comprised of
12 months of 30 days each.

     “Material Adverse Change” means any change occurring since December 31, 2007, in the
consolidated financial position or results of operations of the Company and its subsidiaries taken
as a whole that has had the effect of preventing the Company from carrying on its business or from
meeting its current and anticipated obligations on a timely basis; provided, however, that any
event, condition, change, occurrence or development of a state of circumstances which (a) adversely
affects the oil and gas exploration and development, gas processing and transportation or
hydrocarbon marketing industries generally, including changes in commodity prices or markets,
general market prices and legal or regulatory changes (and in each case does not disproportionately
affect the Company and its subsidiaries considered as a single enterprise as compared to similarly
situated persons), (b) arises out of general economic or industry conditions (and in each case does
not disproportionately affect the Company and its subsidiaries considered as a single enterprise as
compared to similarly situated persons), or (c) arises out of any change in generally accepted
accounting principles (which does not disproportionately affect the Company and its subsidiaries
considered as a single enterprise as compared to similarly situated persons) shall not be
considered in determining whether a Material Adverse Change has occurred.

     “Note” means this Fixed Rate Note Due 2038, dated [     ], 2008.

     “Public Indenture” means the Indenture, dated as of September 19, 2006, between the Borrower
and The Bank of New York Trust Company, N.A., as Trustee.

     “Specified Business Day” means any day that is not a Saturday or Sunday, and that is not a day
on which banking institutions are authorized or obligated by law or executive order to close in New
York, New York.

     Payment of the principal of and any such interest on this Note will be made at the office or
agency of the Company, in such coin or currency of the United States of America as at the time of
payment is legal tender for payment of public and private debts, against surrender of this Note at
the Maturity Date of the principal thereof or any early repayment as provided herein.

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     This Note is subject to redemption, in whole or in part, on any Specified Business Day at the
election of the Company upon not less than 30 days’ nor more than 60 days’ notice, at a redemption
price equal to the greater of (1) 100% of the principal amount to be redeemed (the “Redemption
Amount”) or (2) the amount determined by the quotation agent (the “Make Whole Price”) described
below under “Make Whole Calculation,” plus, in each case, accrued but unpaid interest to the
redemption date.

     In the event of redemption of this Note in part only, a new Note or Notes of like tenor for
the unredeemed portion hereof will be issued in the name of the holder hereof upon the cancellation
hereof and all references to “Note” herein shall include the plural.

Make Whole Calculation

     The quotation agent will determine the Make Whole Price by determining the sum of the present
values of the remaining scheduled payments of the principal of, and interest on, the Redemption
Amount, not including any portion of these payments of interest accrued as of the date on which the
Redemption Amount is to be redeemed, discounted to the date on which the Redemption Amount is to be
redeemed on a semi-annual basis, assuming a 360-day year consisting of twelve 30-day months, at the
adjusted treasury rate described below plus 30 basis points.

     The quotation agent will utilize the following procedures to calculate the adjusted treasury
rate. Western will appoint UBS Securities LLC (“UBS”) or its successor and two or more other
primary U.S. Government securities dealers in New York City as reference dealers and the Company
will appoint UBS or its successor to act as the Company’s quotation agent. If UBS or its successor
is no longer a primary U.S. Government securities dealer, Western will substitute another primary
U.S. Government securities dealer in its place as a reference dealer.

     The quotation agent will select a United States Treasury security which has a maturity
comparable to the remaining maturity of the Note and which would be used in accordance with
customary financial practice to price new issues of corporate debt securities with a maturity
comparable to the remaining maturity of the Note. The reference dealers will provide the quotation
agent with the bid and ask prices for that comparable United States Treasury security as of 5:00
p.m. on the third Specified Business Day before the redemption date. The calculation agent will
calculate the average of the bid and ask prices provided by each reference dealer, eliminate the
highest and the lowest average reference dealer quotations and then calculate the average of the
remaining reference dealer quotations (“the “Comparable Treasury Price”). However, if the
calculation agent obtains fewer than three reference dealer quotations, it will calculate the
average of all the reference dealer quotations and not eliminate any quotations. The adjusted
treasury rate will be the semi-annual equivalent yield to maturity of a security whose price,
expressed as a percentage of its principal amount, is equal to the comparable treasury price.

     The Company represents and warrants to Western that:

     (A) The Company (i) has been duly incorporated and is validly existing and in good standing
under the laws of the State of Delaware, and (ii) is qualified to do business as a foreign

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corporation and is in good standing in each jurisdiction of the United States in which the
ownership of its properties or the conduct of its business requires such qualification and where
the failure to so qualify would reasonably be expected to result in a Material Adverse Change.

     (B) The execution, delivery and performance by the Company of this Note have been duly
authorized by all necessary corporate action of the Company and do not and will not: (i) contravene
the terms of the articles or certificate of incorporation, or bylaws, of the Company; (ii) result
in a breach of or constitute a default under any lease, instrument, contract or other agreement to
which the Company is a party or by which it or its properties may be bound or affected that would
reasonably be expected to result in a Material Adverse Change; or (iii) violate any provision of
any law, rule, regulation, order, judgment, decree or the like binding on or affecting the Company.

     (C) This Note constitutes the legal, valid and binding obligation of the Company, enforceable
against the Company in accordance with its terms, subject to the effect of applicable bankruptcy,
insolvency or similar laws affecting creditors’ rights generally and equitable principles of
general applicability.

     (D) No authorization, consent, approval, license, exemption of, or filing or registration
with, any governmental authority or agency, or approval or consent of any other person or entity
(“Person”), is required for the due execution, delivery or performance by the Company of this Note.

     (E) To the knowledge of the Company, on the date hereof there are no actions, suits, or
proceedings pending or threatened against the Company before any governmental authority as to
which, in the opinion of the Company, there is a reasonable possibility of adverse determinations
that would reasonably be expected, individually or in the aggregate, to result in a Material
Adverse Change.

     (F) The consolidated balance sheets of the Company and its consolidated subsidiaries as of
December 31, 2005 and 2006, and the related consolidated statements of income, stockholders’ equity
and cash flows for each of the years in the three-year period ended December 31, 2006, audited by
KPMG LLP, present fairly, in all material respects, the consolidated financial position of the
Company and its consolidated subsidiaries as of December 31, 2005 and 2006, and their results of
operations, changes in stockholders’ equity and cash flows for each of the years in the three-year
period ended December 31, 2006, in conformity with GAAP applied on a consistent basis.

     (G) The Company is not an “investment company” as defined in, or subject to regulation under,
the Investment Company Act of 1940.

     (H) The Company has filed all United States Federal income tax returns and all other material
tax returns and reports required to be filed (or obtained extensions with respect thereto) and has
paid all taxes required to have been paid by it, except (i) taxes the validity of which are being
contested in good faith by appropriate proceedings, and with respect to which the Company, to the
extent required by GAAP, has set aside on its books adequate reserves or (ii) to

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the extent any failures to do so (individually or in the aggregate) would not reasonably be
expected to result in a Material Adverse Change.

     (I) No Event of Default has occurred and is continuing.

     (J) The making of the loan hereunder does not require any authorization, consent or approval
of, registration or filing with, or any other action by, any governmental authority or any other
Person (including shareholders or any class of directors, whether interested or disinterested, of
the Company or any other Person), nor is any such authorization, consent, approval, registration,
filing or other action necessary for the validity or enforceability of this Note, except such as
have been obtained or made and are in full force and effect.

     So long as any principal, interest or other amount due hereunder shall remain unpaid, the
Company agrees that:

     (1) The Company shall furnish to Western, promptly after the Company has knowledge or becomes
aware thereof, notice of (a) the occurrence of any Event of Default (as defined below); (b) the
filing or commencement of any action, suit or proceeding by or before any arbitrator or
governmental authority against or affecting the Company that if adversely determined would
reasonably be expected to result in a Material Adverse Change; and (c) any other development that
results in, or would reasonably be expected to result in, a Material Adverse Change.

     (2) The Company will comply with the provisions of Sections 1004 and 1005 of the Public
Indenture (a true and complete copy of which the Company hereby represents has been furnished to
Western), which provisions, together with related definitions, are hereby incorporated herein by
reference for the benefit of Western and shall continue in effect for purposes of this paragraph,
regardless of the termination, or any amendment or waiver of, or any consent to any deviation from
or other modification of, the Public Indenture; provided, however, that, for purposes of this
paragraph, (a) references in the Public Indenture to “the Securities” shall be deemed to refer to
the respective obligations of the Company to pay the principal of and interest of this Note, and
(b) references in the Public Indenture to “this Indenture” and to “supplemental indentures” shall
be deemed to refer to this Note and amendments or supplements to this Note, respectively.

     (3) The Company shall comply with all laws, rules, regulations and orders of any governmental
authority applicable to it or its property, except where any failures to do so, individually or in
the aggregate, would not reasonably be expected to result in a Material Adverse Change.

     (4) The Company will at all times maintain, and will cause its subsidiaries to maintain, with
financially sound and reputable insurers, insurance of the kinds and covering the risks and in the
relative proportionate amounts (including as to self-insurance) consistent with that carried by
companies engaged in the same or similar businesses and similarly situated; provided, that the
Company shall not be required to maintain insurance against risks or in amounts no longer
economically available, on a de novo or renewal basis, as applicable, to the Company and other
companies engaged in the same or similar businesses and similarly situated.

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     (5) In the event that the Company is not required to file information with the Securities and
Exchange Commission (the “SEC”) pursuant to the Securities Exchange Act of 1934, as amended (“the
Exchange Act”), the Company will provide to Western, in accordance with the rules and regulations
prescribed from time to time by the SEC, any financial information which may be required pursuant
to the Exchange Act in respect of the issuer of a security listed and registered on a national
securities exchange as may be prescribed in such rules and regulations.

     Any of the following events which shall occur shall constitute an “Event of Default”:

     (i) The Company shall fail to pay when due any amount of principal hereof;

     (ii) The Company shall fail to pay when due any interest hereon or any other amount payable
hereunder, and such failure shall continue unremedied for five (5) Specified Business Days;

     (iii) Any representation or warranty by the Company under or in connection with this Note
shall prove to have been incorrect in any material respect when made;

     (iv) The Company shall fail to perform or observe any other term, covenant or agreement
contained in this Note on its part to be performed or observed, and such failure shall remain
unremedied for a period of thirty (30) days from the date Western provides notice in writing of
such occurrence;

     (v) (a) The Company shall be dissolved, liquidated, wound up or cease its corporate existence
or cease to conduct its business in the ordinary course without the prior authorization of Western;
or (b) the Company (1) shall make a general assignment for the benefit of creditors, or shall
generally fail to pay, or admit in writing its inability to pay, its debts as they become due,
subject to applicable grace periods, if any, whether at stated maturity or otherwise; (2) shall
commence any voluntary Insolvency Proceeding; or (3) shall take any action to effectuate or
authorize any of the foregoing;

     (vi) (a) Any involuntary Insolvency Proceeding (as defined below) is commenced or filed
against the Company, or any writ, judgment, warrant of attachment, execution or similar process is
issued or levied against a substantial part of the Company’s properties and such Insolvency
Proceeding shall not be dismissed, or such writ, judgment, warrant of attachment, execution or
similar process shall not be released, vacated or fully bonded within sixty (60) days after
commencement, filing or levy; (b) the Company admits the material allegations of a petition against
it in any Insolvency Proceeding, or an order for relief (or similar order under non-U.S. law) is
ordered in any Insolvency Proceeding; or (c) the Company acquiesces in the appointment of a
receiver, trustee, custodian, conservator, liquidator, mortgagee in possession (or agent therefor),
or other similar Person for itself or a substantial portion of its property or business.

     (vii) The Company shall (a) default in the payment of principal of any indebtedness in an
aggregate principal amount in excess of $100,000,000 (other than this Note) beyond the period of
grace, if any, provided in the instrument or agreement under which such indebtedness was created as
and when the same shall become due and payable, and such default shall have

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resulted in such indebtedness being declared due and payable prior to its stated maturity, or
(b) default in the observance or performance of any other agreement or condition relating to any
such indebtedness or contained in any instrument or agreement evidencing, securing or relating
thereto, and such default shall have resulted in such indebtedness being declared due and payable
prior to its stated maturity.

     (vii) the Company shall default in the performance of any term, condition, covenant or
agreement contained in the Public Indenture and such default shall have resulted in any of the
Securities (as defined in the Public Indenture) being declared due and payable prior to the date on
which such Securities would otherwise have become due and payable.

     (viii) one or more judgments for the payment of money in an aggregate amount in excess of
$100,000,000 shall be rendered against the Company and the same shall remain undischarged for a
period of thirty (30) consecutive days during which execution shall not be effectively stayed, or
any action shall be legally taken by a judgment creditor to attach or levy upon any assets of the
Company to enforce any such judgment.

     As used herein, “Insolvency Proceeding” means (i) any case, action or proceeding before any
court or other governmental agency or authority relating to bankruptcy, reorganization, insolvency,
liquidation, receivership, dissolution, winding-up or relief of debtors, or (ii) any general
assignment for the benefit of creditors, composition, marshalling of assets for creditors, or
other, similar arrangement in respect of its creditors generally or any substantial portion of its
creditors, in each case undertaken under U.S. federal, state or foreign law, including the
Bankruptcy Code.

     As used herein, “Bankruptcy Code” means Title 11 of the United States Code entitled
“Bankruptcy,” as now and hereafter in effect, or any successor statute.

     If any Event of Default shall occur and be continuing, Western may by notice to the Company
declare the entire unpaid principal amount of this Note, all interest accrued and unpaid hereon and
all other amounts due hereunder to be forthwith due and payable, whereupon the principal hereof,
all such accrued interest and all such other amounts shall become and be forthwith due and payable,
without presentment, demand, protest or further notice of any kind, all of which are hereby
expressly waived by the Company, provided that if an event described in paragraph (iv) or (v) above
shall occur, the result which would otherwise occur only upon giving of notice by Western to the
Company as specified above shall occur automatically, without the giving of any such notice.

     The Company agrees to pay on demand all the losses, costs, and expenses (including, without
limitation, attorneys’ fees and disbursements) which Western incurs in connection with enforcement
of this Note, or the protection or preservation of Western’s rights under this Note, whether by
judicial proceedings or otherwise. Such costs and expenses include, without limitation, those
incurred in connection with any workout or refinancing, or any bankruptcy, insolvency, liquidation
or similar proceedings.

     No single or partial exercise of any power under this Note shall preclude any other or further
exercise of such power or exercise of any other power. No delay or omission on the part

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of Western in exercising any right under this Note shall operate as a waiver of such right or
any other right hereunder.

     This Note shall be binding on each of the Company and Western and their respective successors
and assigns. Neither party may assign or transfer this Note or any of its obligations hereunder
without the other party’s prior written consent.

     No provision of this Note shall alter or impair the obligation of the Company, which is
absolute and unconditional, to pay the principal of and any premium and interest on this Note at
the times, place and rate, and in the coin or currency, herein prescribed, subject to the Company’s
right to redeem all or a portion of this Note as provided herein or as otherwise agreed to by the
parties.

     The transfer of this Note is registrable with the Company, upon surrender of this Note for
registration of transfer at the office or agency of the Company, duly endorsed by, or accompanied
by a written instrument of transfer in form satisfactory to the Company duly executed by Western or
any successor holder hereof or his attorney duly authorized in writing, and thereupon one or more
new Notes of like tenor, of authorized denominations and for the same aggregate principal amount,
will be issued to the designated transferee or transferees.

     No service charge shall be made for any such registration of transfer or exchange, but the
Company may require payment of a sum sufficient to cover any tax or other governmental charge
payable in connection therewith.

     Prior to due presentment of this Note for registration of transfer, the Company may treat the
person in whose name this Note is registered as the owner hereof for all purposes, whether or not
this Note be overdue, and the Company shall not be affected by notice to the contrary.

     This Note shall be governed by and construed in accordance with the law of the State of Texas.

The remainder of this page intentionally left blank.

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     IN
WITNESS WHEREOF, the Company has caused this instrument to be duly
executed this           day of
                    ,
2008.

	 	 	 	 	 
	 	ANADARKO PETROLEUM CORPORATION

 	 
	 	By:  	 	 
	 	Name:  	  	 
	 	Title:  	  	 
	 

8exv10w2

 

Exhibit 10.2

OMNIBUS AGREEMENT

BY AND AMONG

WESTERN GAS PARTNERS, LP

WESTERN GAS HOLDINGS, LLC

AND

ANADARKO PETROLEUM CORPORATION

 

 

Table of Contents

ARTICLE I

Definitions

	 	 	 	 	 	 	 
	1.1
	 	Definitions	 	 	1	 

ARTICLE II

Indemnification

	 	 	 	 	 	 	 
	2.1
	 	Indemnification by Anadarko	 	 	5	 
	2.2
	 	Indemnification by the Partnership Entities	 	 	6	 
	2.3
	 	Limitations Regarding Indemnification	 	 	6	 
	2.4
	 	Indemnification Procedures	 	 	6	 

ARTICLE III

Reimbursement Obligations

	 	 	 	 	 	 	 
	3.1
	 	Reimbursement for Allocated General
and Administrative Expenses; Limitations on Reimbursement	 	 	8	 
	3.2
	 	Reimbursement for Publicly Traded Partnership Expenses	 	 	9	 
	3.3
	 	Reimbursement for Insurance	 	 	9	 
	3.4
	 	Reimbursement Procedures	 	 	9	 

ARTICLE IV

Miscellaneous

	 	 	 	 	 	 	 
	4.1
	 	Accuracy of Recitals	 	 	10	 
	4.2
	 	Choice of Law; Submission to Jurisdiction	 	 	10	 
	4.3
	 	Notices	 	 	10	 
	4.4
	 	Further Assurances	 	 	10	 
	4.5
	 	Agreement	 	 	10	 
	4.6
	 	Termination	 	 	10	 
	4.7
	 	Effect of Waiver or Consent	 	 	11	 
	4.8
	 	Amendment or Modification	 	 	11	 
	4.9
	 	Assignment; Third-Party Beneficiaries	 	 	11	 
	4.10
	 	Counterparts	 	 	11	 
	4.11
	 	Severability	 	 	11	 
	4.12
	 	Interpretation	 	 	11	 
	4.13
	 	Titles and Headings	 	 	12	 
	4.14
	 	Relationship of the Parties	 	 	12	 
	4.15
	 	Binding Effect	 	 	12	 
	4.16
	 	Time of the Essence	 	 	12	 
	4.17
	 	Delay or Partial Exercise Not Waiver	 	 	12	 
	4.18
	 	Withholding or Granting of Consent	 	 	12	 
	4.19
	 	Laws and Regulations	 	 	12	 
	4.20
	 	Negation of Rights of Limited Partners, Assignees and Third Parties	 	 	12	 
	4.21
	 	No Recourse Against Officers or Directors	 	 	13	 
	4.22
	 	Signatories Duly Authorized	 	 	13	 
	4.23
	 	Incorporation of Exhibits by References	 	 	13	 

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OMNIBUS AGREEMENT

     This Omnibus Agreement (“Agreement”) is entered into on, and effective as of, the Closing Date
(as defined herein), and is by and among Western Gas Partners, LP, a Delaware limited partnership
(the “Partnership”), Western Gas Holdings, LLC, a Delaware limited liability company (“General
Partner”), and Anadarko Petroleum Corporation, a Delaware corporation (“Anadarko”). The
above-named entities are sometimes referred to in this Agreement each as a “Party” and collectively
as the “Parties.”

R E C I T A L S:

     The Parties desire by their execution of this Agreement to evidence their understanding, as
more fully set forth in Article II and Article III of this Agreement, with respect to certain
indemnification and reimbursement obligations of the Parties.

     In consideration of the premises and the covenants, conditions, and agreements contained
herein, and for other good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, the Parties hereby agree as follows:

ARTICLE I

Definitions

     1.1 Definitions. (a) Capitalized terms used herein but not defined shall have the meanings
given them in the Partnership Agreement.

     (b) As used in this Agreement, the following terms shall have the respective meanings set
forth below:

     “Affiliate” means, with respect to any Person, (a) any other Person directly or indirectly
controlling, controlled by or under common control with such Person, (b) any Person owning or
controlling fifty percent (50%) or more of the voting interests of such Person, (c) any officer or
director of such Person, or (d) any Person who is the officer, director, trustee, or holder of
fifty percent (50%) or more of the voting interest of any Person described in clauses (a) through
(c). For purposes of this definition, the term “controls,” “is controlled by” or “is under common
control with” shall mean the possession, direct or indirect, of the power to direct or cause the
direction of the management and policies of a Person, whether through the ownership of voting
securities, by contract or otherwise.

     “Agreement” means this Omnibus Agreement, as it may be amended, modified or supplemented from
time to time in accordance with the terms hereof.

     “Anadarko” is defined in the preamble to this Agreement.

     “Anadarko Entities” means Anadarko and any other Person controlled by Anadarko other than the
Partnership Entities. For purposes of this definition, “control” means the possession, direct or
indirect, of the power to direct or cause the direction of the management and policies of a Person,
whether through ownership of Voting Securities, by contract or otherwise.

 

 

     “Change of Control” means, with respect to any Person (the “Applicable Person”), any of the
following events: (i) any sale, lease, exchange or other transfer (in one transaction or a series
of related transactions) of all or substantially all of the Applicable Person’s assets to any other
Person, unless immediately following such sale, lease, exchange or other transfer such assets are
owned, directly or indirectly, by the Applicable Person; (ii) the dissolution or liquidation of the
Applicable Person; (iii) the consolidation or merger of the Applicable Person with or into another
Person pursuant to a transaction in which the outstanding Voting Securities of the Applicable
Person are changed into or exchanged for cash, securities or other property, other than any such
transaction where (A) the outstanding Voting Securities of the Applicable Person are changed into
or exchanged for Voting Securities of the surviving Person or its parent and (B) the holders of the
Voting Securities of the Applicable Person immediately prior to such transaction own, directly or
indirectly, not less than a majority of the outstanding Voting Securities of the surviving Person
or its parent immediately after such transaction; and (iv) a “person” or “group” (within the
meaning of Sections 13(d) or 14(d)(2) of the Exchange Act) other than Anadarko or any Affiliate of
Anadarko becomes the “beneficial owner” (as defined in Rules 13d-3 and 13d-5 under the Exchange
Act) of more than 50% of all of the then outstanding Voting
Securities of the Applicable Person, other than in
a merger or consolidation which would not constitute a Change of Control under clause (iii) above.

     “Closing Date” means the date of the closing of the initial public offering of Common Units.

     “Covered Environmental Losses” means all Environmental Losses by reason of or arising out of
any violation, event, circumstance, action, omission or condition which occurred on or before the
Closing Date.

     “CP Index” is defined in Section 3.1(c).

     “Environmental Activity” shall mean any investigation, study, assessment, evaluation,
sampling, testing, monitoring, containment, removal, disposal, closure, corrective action,
remediation (regardless of whether active or passive), natural attenuation, restoration,
bioremediation, response, repair, corrective measure, cleanup or abatement that is required or
necessary under any applicable Environmental Law, including, without limitation, institutional or
engineering controls or participation in a governmental voluntary cleanup program to conduct
voluntary investigatory and remedial actions for the clean-up, removal or remediation of Hazardous
Substances that exceed actionable levels established pursuant to Environmental Laws, or
participation in a supplemental environmental project in partial or whole mitigation of a fine or
penalty.

     “Environmental Laws” means all federal, state, and local laws, statutes, rules, regulations,
orders, judgments, ordinances, codes, injunctions, decrees, Environmental Permits and other legally
enforceable requirements and rules of common law relating to (i) pollution or protection of the
environment or natural resources, (ii) any Release or threatened Release of, or any exposure of any
Person or property to, any Hazardous Substances or (iii) the generation, manufacture, processing,
distribution, use, treatment, storage, transport or handling of any Hazardous Substances;
including, without limitation, the federal Comprehensive Environmental Response, Compensation and
Liability Act, the Superfund Amendments and Reauthorization

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Act, the Resource Conservation and Recovery Act, the Clean Air Act, the Clean Water Act, the
Safe Drinking Water Act, the Toxic Substances Control Act, the Oil Pollution Act of 1990, the
Federal Hazardous Materials Transportation Law, the Occupational Safety and Health Act, the Marine
Mammal Protection Act, the Endangered Species Act, the National Environmental Policy Act and other
environmental conservation and protection laws, each as amended through the Closing Date.

     “Environmental Losses” means all Losses (including, without limitation, the costs and expenses
of any Environmental Activity or of any environmental or toxic tort pre-trial, trial or appellate
legal or litigation work), by reason of or arising out of:

     (i) any violation or correction of violation of any Environmental Laws;

     (ii) any Environmental Activity to address a Release of Hazardous Substances; or

     (iii) any event, omission or condition associated with ownership or operation of the
Partnership Assets (including, without limitation, the exposure to or presence of Hazardous
Substances on, under, about or migrating to or from the Partnership Assets or the exposure to or
Release of Hazardous Substances arising out of operation of the Partnership Assets at
non-Partnership Asset locations).

     “Environmental Permit” means any permit, approval, identification number, license,
registration, certification, consent, exemption, variance or other authorization required under or
issued pursuant to any applicable Environmental Law.

     “Exchange Act” means the Securities Exchange Act of 1934, as amended.

     “G&A Expenses Limit” is defined in Section 3.1(c).

     “General Partner” is defined in the preamble to this Agreement.

     “Hazardous Substance” means (i) any substance that is designated, defined or classified under
any Environmental Law as a hazardous waste, solid waste, hazardous material, pollutant, contaminant
or toxic or hazardous substance, or terms of similar meaning, or that is otherwise regulated under
any Environmental Law, including, without limitation, any hazardous substance as defined under the
Comprehensive Environmental Response, Compensation and Liability Act, as amended, (ii) oil as
defined in the Oil Pollution Act of 1990, as amended, including, without limitation, oil, gasoline,
natural gas, fuel oil, motor oil, waste oil, diesel fuel, jet fuel and other refined petroleum
hydrocarbons and petroleum products and (iii) radioactive materials, asbestos containing materials
or polychlorinated biphenyls.

     “Indemnified Party” means each Person entitled to indemnification in accordance with Article
II.

     “Indemnifying Party” means each Person from whom indemnification may be required in accordance
with Article II.

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     “Losses” means any losses, damages, liabilities, claims, demands, causes of action, judgments,
settlements, fines, penalties, sanctions, costs and expenses (including, without limitation, court
costs and reasonable attorney’s and experts’ fees) of any and every kind or character.

     “Partnership” is defined in the preamble to this Agreement.

     “Partnership Agreement” means the First Amended and Restated Agreement of Limited Partnership
of the Partnership, dated as of the Closing Date, as such agreement is in effect on the Closing
Date, to which reference is hereby made for all purposes of this Agreement. An amendment or
modification to the Partnership Agreement subsequent to the Closing Date shall be given effect for
the purposes of this Agreement only if it has received the approval of the Special Committee that
would be required, if any, pursuant to Section 4.8 hereof if such amendment or modification were an
amendment or modification of this Agreement.

     “Partnership Assets” means the gathering pipelines, compressors, treating facilities,
transportation pipelines or related equipment or assets, or portions thereof, conveyed, contributed
or otherwise transferred or intended to be conveyed, contributed or otherwise transferred to any
member of the Partnership Group, or owned by, leased by or necessary for the operation of the
business, properties or assets of any member of the Partnership Group, prior to or as of the
Closing Date.

     “Partnership Entities” means the General Partner and each member of the Partnership Group.

     “Partnership Group” means the Partnership and its Subsidiaries treated as a single
consolidated entity.

     “Partnership Group Member” means any member of the Partnership Group.

     “Party” and “Parties” are defined in the preamble to this Agreement.

     “Person” means an individual, corporation, partnership, joint venture, trust, limited
liability company, unincorporated organization or any other entity.

     “Release” means any depositing, spilling, leaking, pumping, pouring, placing, emitting,
discarding, abandoning, emptying, discharging, migrating, injecting, escaping, leaching, dumping or
disposing into the environment.

     “Services” is defined in Section 3.1(a).

     “Subsidiary” means, with respect to any Person, (i) a corporation of which more than 50% of
the voting power of shares entitled (without regard to the occurrence of any contingency) to vote
in the election of directors or other governing body of such corporation is owned, directly or
indirectly, at the date of determination, by such Person, by one or more Subsidiaries of such
Person or a combination thereof, (ii) a partnership (whether general or limited) in which more than
50% of the partnership interests (considering all of the partnership interests
of the partnership as a single class) is owned, directly or indirectly, at the date of

4

 

determination, by such Person, by one or more Subsidiaries of such Person, or a combination
thereof, or (iii) any other Person (other than a corporation or a partnership) in which such
Person, one or more Subsidiaries of such Person, or a combination thereof, directly or indirectly,
at the date of determination, has (A) at least a majority ownership interest or (B) the power to
elect or direct the election of a majority of the directors or other governing body of such Person.

     “Voting Securities” means securities of any class of a Person entitling the holders thereof to
vote in the election of, or to appoint, members of the board of directors or other similar
governing body of the Person.

ARTICLE II

Indemnification

     2.1 Indemnification by Anadarko

          (a) Environmental Indemnification. Subject to the provisions of Section 2.3 and Section 2.4,
Anadarko shall indemnify, defend and hold harmless the Partnership Entities from and against any
Covered Environmental Losses suffered or incurred by the Partnership Entities and arising from or
relating to the Partnership Assets for a period of three (3) years from the Closing Date.

          (b) Additional Indemnification. Subject to the provisions of Section 2.3 and Section 2.4,
Anadarko shall indemnify, defend and hold harmless the Partnership Entities from and against any
Losses suffered or incurred by the Partnership Entities by reason of or arising from:

	 	(i)	 	the failure of the Partnership Entities to be the owner of valid and
indefeasible easement rights, leasehold and/or fee ownership interests in and to the
lands on which are located any Partnership Assets, and such failure renders the
Partnership Entities liable to a third party or unable to use or operate the
Partnership Assets in substantially the same manner that the Partnership Assets were
used and operated by the Anadarko Entities immediately prior to the Closing Date;
	 
	 	(ii)	 	the failure of the Partnership Entities to have on the Closing Date any consent
or governmental permit necessary to allow (A) the transfer of any of the Partnership
Assets to the Partnership Group on the Closing Date or (B) the Partnership Entities to
use or operate the Partnership Assets in substantially the same manner that the
Partnership Assets were used and operated by the Anadarko Entities immediately prior to
the Closing Date;
	 
	 	(iii)	 	all federal, state and local income tax liabilities attributable to (A) the
ownership or operation of the Partnership Assets prior to the Closing Date, (B) any
income tax liabilities of the Anadarko Entities that may result from the consummation
of the formation transactions for the Partnership Entities and (C) any income tax
liabilities arising under Treasury Regulation Section 1.1502-6 and any similar
provision from state, local or foreign applicable law, by contract, as successor or
transferee or otherwise and which income tax is attributable to having been a
member of any consolidated, combined or unitary group prior to the Closing Date;

5

 

	 	(iv)	 	all liabilities, other than Covered Environmental Losses and other than
liabilities incurred in the ordinary course of business conducted in compliance with
applicable laws, that arise out of the Partnership Assets prior to the Closing Date;
and
	 
	 	(v)	 	all liabilities attributable to any assets or liabilities retained by the
Anadarko Entities;

provided, however, that, in the case of clauses (i), (ii) and (iv) above, such indemnification
obligations shall survive for three (3) years from the Closing Date; and in the case of clauses
(iii) and (v) above, such indemnification obligations shall survive until 12:01 a.m. of the first
day after the expiration of any applicable statute of limitations.

     2.2 Indemnification by the Partnership Entities. In addition to and not in limitation of the
indemnification provided under the Partnership Agreement, the Partnership Entities shall indemnify,
defend and hold harmless the Anadarko Entities from and against any Losses (excluding Environmental
Losses) suffered or incurred by the Anadarko Entities by reason of or arising out of events and
conditions associated with the operation of the Partnership Assets and occurring on or after the
Closing Date, unless in any such case indemnification would not be permitted under the Partnership
Agreement by reason of one of the provisos contained in Section 7.7 of the Partnership Agreement.

     2.3 Limitations Regarding Indemnification.

          (a) Notwithstanding anything herein to the contrary, in no event shall the Indemnifying Party
have any indemnification obligations under this Agreement for claims made as a result of additions
to or modifications of Environmental Laws promulgated after the Closing Date.

          (b) Notwithstanding anything herein to the contrary, the liability of the Indemnifying Party
for any indemnification obligations under this Agreement will be subject to reduction for (i) any
insurance proceeds realized by the Indemnified Party with respect to the indemnified party and (ii)
any amounts recovered by the Indemnified Party under contractual indemnities from third parties.
The Partnership hereby agrees to use commercially reasonable efforts to realize any applicable
insurance proceeds and amounts recoverable under such contractual indemnities.

          (c) The liability of the Indemnifying Party for any indemnification obligations under this
Agreement will be reduced by any amounts reserved or accrued for such Losses on the consolidated
balance sheet of the Partnership Entities as of September 30, 2007.

     2.4 Indemnification Procedures.

          (a) The Indemnified Party agrees that within thirty (30) days after it becomes aware of facts
giving rise to a claim for indemnification pursuant to this Article II, it will provide

6

 

notice thereof in writing to the Indemnifying Party specifying the nature of and specific
basis for such claim; provided, however, that the Indemnified Party shall not submit claims more
frequently than once a calendar quarter (or twice in the case of the last calendar quarter prior to
the expiration of the applicable indemnity coverage under this Agreement). Notwithstanding the
foregoing, the Indemnified Party’s failure to provide notice under this Section 2.4 will not
relieve the Indemnifying Party from liability hereunder with respect to such matter except in the
event and only to the extent that the Indemnifying Party is materially prejudiced by such failure
or delay.

          (b) The Indemnifying Party shall have the right to control all aspects of the defense of (and
any counterclaims with respect to) any claims brought against the Indemnified Party that are
covered by the indemnification set forth in this Article II, including, without limitation, the
selection of counsel (provided that if such claim involves Covered Environmental Losses, such
counsel shall be reasonably acceptable to the Indemnified Party), determination of whether to
appeal any decision of any court and the settling of any such matter or any issues relating
thereto; provided, however, that no such settlement shall be entered into without the consent
(which consent shall not be unreasonably withheld, conditioned or delayed) of the Indemnified Party
unless it includes a full release of the Indemnified Party from such matter or issues, as the case
may be.

          (c) The Indemnified Party agrees to cooperate fully with the Indemnifying Party with respect
to all aspects of the defense of any claims covered by the indemnification set forth in this
Article II, including, without limitation, the prompt furnishing to the Indemnifying Party of any
correspondence or other notice relating thereto that the Indemnified Party may receive, permitting
the names of the Indemnified Party to be utilized in connection with such defense, the making
available to the Indemnifying Party of any files, records or other information of the Indemnified
Party that the Indemnifying Party considers relevant to such defense and the making available to
the Indemnifying Party of any employees of the Indemnified Party; provided, however, that in
connection therewith the Indemnifying Party agrees to use reasonable efforts to minimize the impact
thereof on the operations of the Indemnified Party and further agrees to maintain the
confidentiality of all files, records and other information furnished by the Indemnified Party
pursuant to this Section 2.4, unless otherwise required by law or the listing standards of the New
York Stock Exchange. In no event shall the obligation of the Indemnified Party to cooperate with
the Indemnifying Party as set forth in the immediately preceding sentence be construed as imposing
upon the Indemnified Party an obligation to hire and pay for counsel in connection with the defense
of any claims covered by the indemnification set forth in this Article II; provided, however, that
the Indemnified Party may, at its own option, cost and expense, hire and pay for counsel in
connection with any such defense. The Indemnifying Party agrees to keep any such counsel hired by
the Indemnified Party reasonably informed as to the status of any such defense, but the
Indemnifying Party shall have the right to retain sole control over such defense.

          (d) The indemnification obligations under this Article II shall continue with respect to any
claim for indemnification pursuant to this Article II that is pending as of the end of the
applicable survival period notwithstanding the expiration of such survival period.

7

 

ARTICLE III

Reimbursement Obligations

     3.1 Reimbursement for Allocated General and Administrative Expenses; Limitations on
Reimbursement.

          (a) Anadarko hereby agrees to cause the Anadarko Entities to continue to provide the
Partnership Entities with certain general and administrative services, such as legal, accounting,
treasury, cash management, insurance, administrative and claims processing, risk management,
health, safety and environmental, information technology, human resources, credit, payroll,
internal audit, tax, marketing and midstream. These general and administrative services shall be
substantially identical in nature and quality to the services of such type previously provided by
the Anadarko Entities in connection with their management and operation of the Partnership Assets
prior to their acquisition by the Partnership Group. In the event that the Partnership Group makes
any acquisitions of assets or businesses from any of the Anadarko Entities during the first three
years following the date of this Agreement, Anadarko will cause the Anadarko Entities to similarly
provide general and administrative services that are substantially identical in nature and quality
to the services of such type previously provided by the Anadarko Entities in connection with their
management and operation of such assets or businesses prior to their acquisition by the Partnership
Group. In addition, in the event that the Partnership Group makes any acquisition of assets or
businesses from any third party during the first three years following the date of this Agreement,
Anadarko will cause the Anadarko Entities to provide general and administrative services that are
substantially identical in nature and quality to the services of such type previously provided by
the Anadarko Entities in connection with their management and operation of similar assets or
businesses.

          (b) Subject to the provisions of Section 3.1(c) below, the Partnership Group hereby agrees to
reimburse Anadarko for all expenses and expenditures that the Anadarko Entities incur or payments
they make on behalf of the Partnership Entities for these general and administrative services
provided for in Section 3.1(a).

          (c) Except to the extent modified by this Section 3.1(c), the amount for which Anadarko shall
be entitled to reimbursement from the Partnership Entities pursuant to Section 3.1(b) for general
and administrative expenses shall not exceed $6.0 million annually from the date of this Agreement
through December 31, 2009 (the “G&A Expenses Limit”). On January 1, 2009, the G&A Expenses Limit
shall be increased by the percentage increase in the Consumer Price Index — All Urban Consumers,
U.S. City Average, Not Seasonally Adjusted (the “CP Index”). In making such adjustment, the G&A
Expenses Limit shall be increased by the CP Index for the prior year period based on the most
recent information available from the U.S. Department of Labor. If
after the Closing the
Partnership Group completes any acquisition of assets or businesses or the business of the
Partnership Group otherwise expands from the date of this Agreement through December 31, 2009, then
the G&A Expenses Limit shall be appropriately increased in order to account for adjustments in the
nature and extent of the general and administrative services provided by the Anadarko Entities to
the Partnership Entities, with any such increase in the G&A Expenses Limit (i) to remain in effect
(subject to adjustment, if any, as provided in the immediately preceding sentence or for any
subsequent acquisition(s)) for the period from the completion of any such acquisition through
December 31, 2009 and (ii) to be

8

 

subject to the prior approval of the Special Committee. After December 31, 2009, the G&A
Expenses Limit will no longer apply and the General Partner will determine the amount of general
and administrative expenses that will be properly allocated to the Partnership Group in accordance
with the terms of the Partnership Agreement. The G&A Expenses Limit shall not apply to
reimbursement for publicly traded partnership expenses of the Partnership Group as provided in
Section 3.2, including those publicly traded partnership expenses incurred on or before the Closing
Date by the Anadarko Entities on behalf of the Partnership Entities.

     3.2 Reimbursement for Publicly Traded Partnership Expenses.

          (a) The Partnership Entities hereby agree to reimburse Anadarko for all expenses and
expenditures that the Anadarko Entities incur or payments that they make as a result of the
Partnership becoming a publicly traded partnership, including (but not limited to) expenses
associated with annual and quarterly reporting; tax return and Schedule K-1 preparation and
distribution expenses; Sarbanes-Oxley compliance expenses; expenses associated with listing on the
New York Stock Exchange; independent auditor fees; legal fees; investor relations expenses; and
registrar and transfer agent fees. Furthermore, the Partnership Entities agree to reimburse
Anadarko for these expenses incurred on or before the Closing Date by the Anadarko Entities on
behalf of the Partnership Entities.

          (b) The obligation of the Partnership Entities to reimburse Anadarko pursuant to this Section
3.2 shall not be subject to any monetary limitation, including the G&A Expenses Limit contained in
Section 3.1.

     3.3 Reimbursement for Insurance. The Partnership Entities hereby agree to reimburse Anadarko
for all expenses that the Anadarko Entities incur or payments that they make on behalf of the
Partnership Entities for insurance coverage with respect to the Partnership Assets.

     3.4 Reimbursement Procedures. On or before the fifth business day of each month, Anadarko
shall send an invoice to the General Partner for that amount of money associated with all expenses
or expenditures incurred or payments made by the Anadarko Entities that are to be reimbursed by the
Partnership Entities pursuant to Sections 3.1, 3.2 and 3.3 hereof. Where it is not reasonably
practicable to determine the cost of such an expense, expenditure or payment, Anadarko or the
applicable Anadarko entity may make a good faith reasonable estimate of such expense, expenditure
or payment (and provided that any such estimates, other than with respect to benefit load, are “trued up” within 10 days of the end of each quarter based
on the actual amount of the expenses, expenditures or payments in respect of which estimates were
made in the immediately preceding quarter). Subject to the parenthetical clause in the immediately preceding sentence, the Partnership
Entities shall accept any estimate or benefit load described in this paragraph, provided that such
estimate is reasonable and made in good faith. The Partnership Entities shall pay such invoice,
subject to any adjustment imposed by Section 3.1(c) hereof, within 30 days of receipt.

9

 

ARTICLE IV

Miscellaneous

     4.1 Accuracy of Recitals. The paragraphs contained in the recitals to this Agreement are
incorporated in this Agreement by this reference, and the Parties to this Agreement acknowledge the
accuracy thereof.

     4.2 Choice of Law; Submission to Jurisdiction. This Agreement shall be subject to and
governed by the laws of the State of Texas. Each Party hereby submits to the jurisdiction of the
state and federal courts in the State of Texas and to venue in Houston, Texas.

     4.3 Notices. Any notice, demand, or communication required or permitted under this Agreement
shall be in writing and delivered personally, by reputable courier, or by telecopier, and shall be
deemed to have been duly given as of the date and time reflected on the delivery receipt if
delivered personally or sent by reputable courier service, or on the automatic telecopier receipt
if sent by telecopier, addressed as follows:

Anadarko Petroleum Corporation

1201 Lake Robbins Drive

The Woodlands, Texas 77380

Attn: General Counsel

Fax: 832-636-3214

Western Gas Holdings, LLC

1201 Lake Robbins Drive

The Woodlands, Texas 77380

Attn: President

Fax: 832-636-6001

A Party may change its address for the purposes of notices hereunder by giving notice to the other
Party specifying such changed address in the manner specified in this Section 6.2.

     4.4 Further Assurances. The Parties agree to execute such additional instruments, agreements
and documents, and to take such other actions, as may be necessary to effect the purposes of this
Agreement.

     4.5 Agreement. This Agreement constitutes the entire agreement of the Parties relating to the
matters contained herein, superseding all prior contracts or agreements, whether oral or written,
relating to the matters contained herein.

     4.6 Termination. This Agreement, other than the provisions set forth in Article II hereof,
shall terminate upon a Change of Control of the General Partner or the Partnership, other than any
Change of Control of the General Partner or the Partnership that may be deemed to have occurred
pursuant to clause (iv) of the definition of Change of Control solely as a result of a Change of
Control of Anadarko. Notwithstanding any other provision of this Agreement, if the General Partner
is removed as general partner of the Partnership under circumstances where Cause does not exist and
Common Units held by the General Partner and its Affiliates are not voted in favor of such removal,
this Agreement may immediately thereupon be terminated by Anadarko.

10

 

     4.7 Effect of Waiver or Consent. No waiver or consent, express or implied, by any Party to or
of any breach or default by any Person in the performance by such Person of its obligations
hereunder shall be deemed or construed to be a consent or waiver to or of any other breach or
default in the performance by such Person of the same or any other obligations of such Person
hereunder. Failure on the part of a Party to complain of any act of any Person or to declare any
Person in default, irrespective of how long such failure continues, shall not constitute a waiver
by such Party of its rights hereunder until the applicable statute of limitations period has run.

     4.8 Amendment or Modification. This Agreement may be amended or modified from time to time
only by the written agreement of all the Parties; provided, however, that the Partnership may not,
without the prior approval of the Special Committee, agree to any amendment or modification of this
Agreement that, in the reasonable discretion of the General Partner, will have an adverse effect on
the holders of Common Units. Each such instrument shall be reduced to writing and shall be
designated on its face an “Amendment” or an “Addendum” to this Agreement.

     4.9 Assignment; Third-Party Beneficiaries. No Party shall have the right to assign its rights
or obligations under this Agreement without the prior written consent of the other Parties. Each
of the Parties hereto specifically intends that each entity comprising the Anadarko Entities and
the Partnership Entities, as applicable, whether or not a Party to this Agreement, shall be
entitled to assert rights and remedies hereunder as third-party beneficiaries hereto with respect
to those provisions of this Agreement affording a right, benefit or privilege to any such entity.

     4.10 Counterparts. This Agreement may be executed in any number of counterparts with the same
effect as if all signatory Parties had signed the same document. All counterparts shall be
construed together and shall constitute one and the same instrument.

     4.11 Severability. If any provision of this Agreement or the application thereof to any
Person or circumstance shall be held invalid or unenforceable to any extent, the remainder of this
Agreement and the application of such provision to other Persons or circumstances shall not be
affected thereby and shall be enforced to the greatest extent permitted by law.

     4.12 Interpretation. In this Agreement, unless a clear contrary intention appears: (a) the
singular includes the plural and vice versa; (b) reference to
any Person includes such Person’s successors
and assigns but, in the case of Party, only if such successors and assigns are permitted by this
Agreement, and reference to a Person in a particular capacity excludes such Person in any other
capacity; (c) reference to any gender includes each other gender; (d) reference to any agreement
(including this Agreement), document or instrument means such agreement, document, or instrument as
amended or modified and in effect from time to time in accordance with the terms thereof and, if
applicable, the terms of this Agreement; (e) reference to any Section means such Section of this
Agreement, and references in any Section or definition to any clause means such clause of such
Section or definition; (f) “hereunder,” “hereof,” “hereto” and words of similar import will be
deemed references to this Agreement as a whole and not to any particular Section or other provision
hereof or thereof; (g) “including” (and with correlative meaning “include”) means including without
limiting the generality of any description preceding

11

 

such term; and (h) relative to the determination of any period of time, “from” means “from and
including,” “to” means “to but excluding” and “through” means “through and including.”

     4.13 Titles and Headings. Section titles and headings in this Agreement are inserted for
convenience of reference only and are not intended to be a part of, or to affect the meaning or
interpretation of, this Agreement.

     4.14 Relationship of the Parties.

          (a) Nothing in this Agreement shall cause any of the Anadarko Entities or the Partnership
Entities to become members of any other partnership, joint venture, association, syndicate or other
entity. Nothing in this Agreement shall cause any Partnership Entity to be considered an Anadarko
Entity, and vice versa.

          (b) For purposes of this Agreement, no Partnership Entity shall be deemed to be an Affiliate
of the Anadarko Entities nor shall any Anadarko Entity be deemed to
be an Affiliate of the
Partnership Entities.

     4.15 Binding Effect. This Agreement will be binding upon, and will inure to the benefit of,
the Parties and their respective successors, permitted assigns and legal representatives.

     4.16 Time of the Essence. Time is of the essence in the performance of this Agreement.

     4.17 Delay or Partial Exercise Not Waiver. No failure or delay on the part of any Party to
exercise any right or remedy under this Agreement will operate as a waiver thereof; nor shall any
single or partial exercise of any right or remedy under this Agreement preclude any other or
further exercise thereof or the exercise of any other right or remedy granted hereby or any related
document. The waiver by either Party of a breach of any provisions of this Agreement will not
constitute a waiver of a similar breach in the future or of any other breach or nullify the
effectiveness of such provision.

     4.18 Withholding or Granting of Consent. Unless otherwise provided in this Agreement, each
Party may, with respect to any consent or approval that it is entitled to grant pursuant to this
Agreement, grant or withhold such consent or approval in its sole and uncontrolled discretion, with
or without cause, and subject to such conditions as it shall deem appropriate.

     4.19 Laws and Regulations. Notwithstanding any provision of this Agreement to the contrary,
no Party shall be required to take any act, or fail to take any act, under this Agreement if the
effect thereof would be to cause such Party to be in violation of any applicable law, statute, rule
or regulation.

     4.20 Negation of Rights of Limited Partners, Assignees and Third Parties. Except as set forth
in Section 4.9, the provisions of this Agreement are enforceable solely by the Parties, and no
limited partner, member, or assignee of Anadarko or the Partnership or other Person shall have the
right, separate and apart from Anadarko or the Partnership, to enforce any provision of this
Agreement or to compel any Party to comply with the terms of this Agreement.

12

 

     4.21 No Recourse Against Officers or Directors. For the avoidance of doubt, the provisions of
this Agreement shall not give rise to any right of recourse against any officer or director of any
Anadarko Entity or any Partnership Entity.

     4.22 Signatories Duly Authorized. Each of the signatories to this Agreement represents that he
is duly authorized to execute this Agreement on behalf of the Party for which he is signing, and
that such signature is sufficient to bind the Party purportedly represented.

     4.23 Incorporation of Exhibits by References. Any reference herein to any exhibit to this
Agreement will incorporate it herein, as if it were set out in full in the text of this Agreement.

[Signature page follows]

13

 

     IN WITNESS WHEREOF, the Parties have executed this Agreement on, and effective as of, the
Closing Date.

	 	 	 	 	 
	 	WESTERN GAS PARTNERS, LP

 	 
	 	By:  	WESTERN GAS HOLDINGS, LLC,
 	 
	 	 	its general partner 	 
	 	 	 
	 	By:  	
 	 
	 	 	Name:  	Robert G. Gwin 	 
	 	 	Title:  	President and Chief Executive Officer 	 
	 
	 
	 	WESTERN GAS HOLDINGS, LLC

 	 
	 	By:  	 	 
	 	 	Name:  	Robert G. Gwin 	 
	 	 	Title:  	President and Chief Executive Officer 	 
	 
	 
	 	ANADARKO PETROLEUM CORPORATION

 	 
	 	By:  	 	 
	 	 	Name:  	Robert G. Gwin 	 
	 	 	Title:  	Vice President, Finance and Treasurer 	 
	 

Signature Page to Omnibus Agreement

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