Document:

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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

	 	 	7	 
	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 for Allocated Commitment Fee

	 	 	9	 
	3.5 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

	 	 	11	 
	4.6 Termination

	 	 	11	 
	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

	 	 	12	 
	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

	 	 	13	 
	4.20 Negation of Rights of Limited Partners, Assignees and Third Parties

	 	 	13	 
	4.21 No Recourse Against Officers or Directors

	 	 	13	 
	4.22 Signatories Duly Authorized

	 	 	13	 
	4.23 Incorporation of Exhibits by References

	 	 	13	 

 i

 

 

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 associated with the operation of
the Partnership Assets occurring on or before the Closing Date, but only to the extent such
violation, event circumstance, action, omission or condition occurs on or before the Closing Date.

     “Credit Agreement” means that certain Revolving Credit Agreement, dated as of March 4, 2008,
by and among Anadarko Petroleum Corporation, Western Gas Partners, LP, JP Morgan Chase Bank, N.A.,
The Royal Bank of Scotland, PLC, BNP Paribas, Bank of America, N.A., BMO Capital Markets Financing,
Inc., The Bank of Tokyo-Mitsubishi UFJ, LTD., and each of the Lenders named therein.

     “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.

2

 

     “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 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 of or cost to correct a 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 that results in a violation of any Environmental Law (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.

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     “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.

     “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).

4

 

     “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 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;

5

 

	 	(iii)	 	all federal, state and local income tax liabilities (A) attributable to the
ownership or operation of the Partnership Assets prior to the Closing Date, (B) of the
Anadarko Entities that may result from the consummation of the formation transactions
for the Partnership Entities, (C) of the Partnership Entities that may arise after the
Closing Date and which have been specifically assumed by Anadarko or (D) arising under
Treasury Regulation Section 1.1502-6 and any similar provision of 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;
	 
	 	(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.

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          (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 December 31, 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 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

7

 

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.

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 cash 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) Subject to the provisions of 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

8

 

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 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 3.3 or the
reimbursement of allocable commitment fees as provided in Section 3.4, including those publicly
traded partnership expenses and allocable commitment fees 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 for Allocated Commitment Fee. The Partnership Entities hereby agree to
reimburse Anadarko for their allocable portion of commitment fees that Anadarko incurs or pays
under the Credit Agreement equal to an annual amount of 0.11% of the Partnership’s committed and
available borrowing capacity thereunder.

     3.5 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 during the preceding month that
are to be reimbursed by the Partnership Entities pursuant to Sections 3.1,

9

 

3.2, 3.3 and 3.4 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 is “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.

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.

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     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.

     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.

11

 

     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 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 any 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

12

 

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.

     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:  	       /s/ Robert G. Gwin
 	 
	 	 	Name:  	Robert G. Gwin 	 
	 	 	Title:  	President and Chief Executive Officer 	 
	 
	 	 	 	 	 
	 	WESTERN GAS HOLDINGS, LLC

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

 	 
	 	By:  	/s/ James T. Hackett
 	 
	 	 	Name:  	James T. Hackett 	 
	 	 	Title:  	Chairman, President and Chief
 Executive
Officer 	 
	 

Signature Page to Omnibus Agreementexv10w4

Execution Version

SERVICES AND SECONDMENT AGREEMENT

BY AND BETWEEN

WESTERN GAS HOLDINGS, LLC

AND

ANADARKO PETROLEUM CORPORATION

 

 

TABLE OF CONTENTS

	 	 	 	 	 	 	 
	 

	 	ARTICLE I	 	 	 	 
	 

	 	SECONDMENT	 	 	 	 
	 
	 	 	 	 	 	 
	1.1

	 	Seconded Employees
	 	 	2	 
	1.2

	 	Period of Secondment
	 	 	2	 
	1.3

	 	Withdrawal, Departure or Resignation
	 	 	3	 
	1.4

	 	Termination of Secondment
	 	 	3	 
	1.5

	 	Supervision
	 	 	4	 
	1.6

	 	Seconded Employee Qualifications; Approval
	 	 	4	 
	 
	 	 	 	 	 	 
	 

	 	ARTICLE II	 	 	 	 
	 

	 	SECONDMENT SERVICES	 	 	 	 
	 
	 	 	 	 	 	 
	2.1

	 	Secondment Services
	 	 	5	 
	2.2

	 	Cancellation or Reduction of Secondment Services
	 	 	5	 
	2.3

	 	Workers’ Compensation
	 	 	5	 
	 
	 	 	 	 	 	 
	 

	 	ARTICLE III	 	 	 	 
	 

	 	SERVICES REIMBURSEMENT	 	 	 	 
	 
	 	 	 	 	 	 
	3.1

	 	Operational, Management, Reporting and Routine Maintenance Expenses
	 	 	6	 
	3.2

	 	Seconded Employees
	 	 	6	 
	 
	 	 	 	 	 	 
	 

	 	ARTICLE IV	 	 	 	 
	 

	 	ALLOCATION; RECORDS; AGENT	 	 	 	 
	 
	 	 	 	 	 	 
	4.1

	 	Allocation; Records
	 	 	8	 
	4.2

	 	Agent
	 	 	8	 
	 
	 	 	 	 	 	 
	 

	 	ARTICLE V	 	 	 	 
	 

	 	TERM	 	 	 	 
	 
	 	 	 	 	 	 
	 

	 	ARTICLE VI	 	 	 	 
	 

	 	GENERAL PROVISIONS	 	 	 	 
	 
	 	 	 	 	 	 
	6.1

	 	Accuracy of Recitals
	 	 	10	 
	6.2

	 	Choice of Law; Submission to Jurisdiction
	 	 	10	 
	6.3

	 	Notices
	 	 	10	 
	6.4

	 	Further Assurances
	 	 	11	 
	6.5

	 	Entire Agreement
	 	 	11	 
	6.6

	 	Effect of Waiver or Consent
	 	 	11	 
	6.7

	 	Amendment or Modification
	 	 	11	 
	6.8

	 	Assignment; Third-Party Beneficiaries
	 	 	11	 
	6.9

	 	Counterparts
	 	 	11	 
	6.10

	 	Severability
	 	 	11	 
	6.11

	 	Interpretation
	 	 	12	 
	6.12

	 	Titles and Headings
	 	 	12	 
	6.13

	 	Relationship of the Parties
	 	 	12	 

i

 

	 	 	 	 	 	 	 
	6.14

	 	Binding Effect
	 	 	12
	 
	6.15

	 	Time of the Essence
	 	 	13	 
	6.16

	 	Delay or Partial Exercise Not Waiver
	 	 	13	 
	6.17

	 	Withholding or Granting of Consent
	 	 	13	 
	6.18

	 	Laws and Regulations
	 	 	13	 
	6.19

	 	No Recourse Against Officers or Directors
	 	 	13	 
	6.20

	 	Signatories Duly Authorized
	 	 	13	 
	6.21

	 	Incorporation of Exhibits by References
	 	 	13	 
	6.22

	 	Dispute Resolution and Arbitration
	 	 	13	 
	6.23

	 	Continuation of Work During Dispute
	 	 	14	 
	6.24

	 	Legal Compliance
	 	 	15	 

-ii-

 

SERVICES AND SECONDMENT AGREEMENT

     This Services and Secondment Agreement (the “Agreement”), dated as of May 14, 2008 (the
“Effective Date”), is entered into between Anadarko Petroleum Corporation, a Delaware corporation
(“Anadarko”), and Western Gas Holdings, LLC, a Delaware limited liability company (“General
Partner”) and the general partner of Western Gas Partners, LP, a Delaware limited partnership (the
“Partnership”). Anadarko and the General Partner are hereinafter each referred to as a “Party” and
are collectively referred to as the “Parties.” Capitalized terms used herein but not defined shall
have the meanings given them in that certain Omnibus Agreement by and among the Partnership, the
General Partner and Anadarko, dated May 14, 2008 (the “Omnibus Agreement”).

RECITALS:

     WHEREAS, Anadarko will cause the Anadarko Entities to provide to the Partnership Group the
services necessary to operate, manage, maintain and report the operating results of the
Partnership’s assets, including gathering pipelines, compressors, treating facilities,
transportation pipelines or related equipment or assets (the “Partnership Assets”);

     WHEREAS, in connection with the provision of the services under this Agreement, Anadarko
desires to second to the General Partner certain personnel employed or contracted by the Anadarko
Entities in connection with the Partnership Assets;

     NOW THEREFORE, in consideration of the premises and the mutual covenants and agreements
contained herein, and other good and valuable consideration, the receipt and sufficiency of which
are hereby acknowledged, Anadarko and the General Partner hereby agree as follows:

 -1- 

 

     v

     SECONDMENT

I) Seconded Employees. 

     Subject to the terms of this Agreement, Anadarko agrees to cause the Anadarko Entities to
second to the General Partner, and the General Partner agrees to accept the secondment of, those
certain specifically identified individuals (each, a “Seconded Employee” and collectively, the
“Seconded Employees”) listed on Exhibit A (the “Seconded Employee Schedule”) for the
purpose of performing job functions related to the Partnership Assets (the “Secondment”). The
Seconded Employees will remain at all times employees of the Anadarko Entities but, in addition,
they will also be temporary employees of the General Partner during the Period of Secondment (as
defined below) and shall, at all times during the Period of Secondment, work under the direction,
supervision and control of the General Partner. Anadarko will retain the right to cause the
Anadarko Entities to hire or discharge the Seconded Employees but, subject to the provisions in
Section 1.2, will not have the right to cause the Anadarko Entities to terminate the Secondment to
the General Partner or otherwise exercise direction, supervision or control over the Seconded
Employees. For each Seconded Employee, the “Period of Secondment” shall be that period of time as
set forth in Section 1.2. Seconded Employees shall have no authority or apparent authority to act
on behalf of the Anadarko Entities during the Period of Secondment. The Seconded Employee Schedule
sets forth the names of the Seconded Employees seconded by the Anadarko Entities, the job functions
of the Seconded Employees and the starting date for the Period of Secondment for each Seconded
Employee. Individuals may be added or removed from the Seconded Employee Schedule from time to time
by the execution by the Parties of a completed “Addition/Removal/Change of Responsibility of
Seconded Employee” form, the form of which is attached to this Agreement as Exhibit B,
which will be fully binding on the Parties for all purposes under this Agreement. Those rights and
obligations of the Parties under this Agreement that relate to individuals that were on the
Seconded Employee Schedule but then later removed from the Seconded Employee Schedule, which rights
and obligations accrued before the removal of such individual, will survive the removal of such
individual from the Seconded Employee Schedule to the extent necessary to enforce such rights and
obligations.

II) Period of Secondment. 

     Anadarko will cause the Anadarko Entities to second to the General Partner each Seconded
Employee on the start date set forth on the Seconded Employee Schedule and continue

 -2- 

 

to second,
during the period (and only during the period) that the Seconded Employee is performing services
for the General Partner, until the earliest of:

A) the end of the term of this Agreement;

B) the end date, if any, set forth for the Seconded Employee on the Seconded
Employee Schedule (or another end date for such Seconded Employee as mutually agreed in
writing by the Parties) (the “End Date”);

C) a withdrawal, departure, resignation or termination of such Seconded Employee
under Section 1.3;

D) the date on which WGR Holdings, LLC ceases to own a majority of the issued and
outstanding voting equity of the General Partner and the General Partner has entered
into satisfactory arrangements which it determines, in good faith, will
provide it with suitable qualified and experienced full-time or seconded employees
necessary to operate, manage and maintain the Partnership Assets and

E) a termination of Secondment for such Seconded Employee under Section 1.4.

     At the end of the Period of Secondment for any Seconded Employee, such Seconded Employee will
no longer be subject to the direction of the General Partner with regard to the Seconded Employee’s
day-to-day activities.

III) Withdrawal, Departure or Resignation. 

     Anadarko will use reasonable efforts to cause the Anadarko Entities to prevent any early
withdrawal, departure or resignation of any Seconded Employee prior to the End Date for such
Seconded Employee’s Period of Secondment. If any Seconded Employee tenders his resignation to an
Anadarko Entity as an employee of such Anadarko Entity, Anadarko will promptly notify the General
Partner. During the Period of Secondment for any Seconded Employee, Anadarko will cause the
Anadarko Entities to not voluntarily withdraw or terminate any Seconded Employee except with the
written consent of the General Partner (which may be through the execution of a completed
Addition/Removal/Change of Responsibility of Seconded Employee form), such consent not to be
unreasonably withheld. Anadarko will indemnify, defend and hold harmless the General Partner and
its directors, officers and employees against any and all costs, expenses (including reasonable
attorneys’ fees), claims, demands, losses, liabilities, obligations, actions, lawsuits and other
proceedings, judgments and awards (each, a “Loss” and collectively, the “Losses”) arising out of or
in any way connected with or related to the termination of employment of any Seconded Employee by
any Anadarko Entity without the consent of THE GENERAL PARTNER, EVEN THOUGH SUCH LOSS MAY BE CAUSED
IN PART BY THE NEGLIGENCE OF ONE OR MORE OF THE PARTNERSHIP ENTITIES, except to the extent that
such Losses (i) arise solely out of or result solely from the negligence, gross negligence or
willful misconduct of any of the Partnership Entities, or (ii) arise in connection with the
termination of a Seconded Employee for cause. Upon the termination of employment, the Seconded
Employee will cease performing services for the General Partner.

IV) Termination of Secondment. 

     The General Partner will have the right to terminate the Secondment to it of any Seconded
Employee for any reason at any time. Subject to Section 1.2, Anadarko will not have the right to
cause any Anadarko Entity to terminate the Secondment to the General Partner of any Seconded
Employee. Upon the termination of any Seconded Employee’s Period of Secondment, Anadarko will be
solely liable for any costs or expenses associated with the termination of the

 -3- 

 

Secondment, except
as otherwise specifically set forth in this Agreement. Anadarko will indemnify, defend and hold
harmless the General Partner and its directors, officers and employees against all Losses arising
out of or in any way connected with or related to the termination of the Secondment of any Seconded
Employee by THE GENERAL PARTNER, EVEN THOUGH SUCH LOSS MAY BE CAUSED IN PART BY THE NEGLIGENCE OF
ONE OR MORE OF THE PARTNERSHIP ENTITIES, except to the extent that such Losses arise solely out of
or result solely from the negligence, gross negligence or willful misconduct of any of the
Partnership Entities. Upon the termination of a Secondment, the Seconded Employee will cease
performing services for the General Partner. At no time will the General Partner have the right to
terminate the employment with the Anadarko Entities of the Seconded Employees.

V) Supervision. 

     During the Period of Secondment, the General Partner shall:

A) be ultimately and fully responsible for the daily work assignments of the
Seconded Employee (and with respect to Seconded Employees that also provide services to
the Anadarko Entities in connection with its operations (“Shared Seconded Employees”),
during those times that the Shared Seconded Employees are performing services for the
General Partner hereunder), including supervision of their day-to-day work activities
and performance consistent with the purposes stated in Section 1.1 and the job
functions set forth in the Seconded Employee Schedule;

B) set the hours of work and the holidays and vacation schedules (other than with
respect to Shared Seconded Employees, as to which the General Partner and Anadarko
shall jointly determine) for the Seconded Employee and

C) have the right to determine training which will be received by the Seconded
Employee.

     In the course and scope of performing any Seconded Employee’s job functions, the Seconded
Employee will be integrated into the organization of the General Partner, will report into the
General Partner’s management structure, and will be under the direct management and supervision of
the General Partner. The General Partner shall designate one of its officers to be responsible for
the supervisory function set forth in this Section 1.5 on behalf of the General Partner.

VI) Seconded Employee Qualifications; Approval. 

     Anadarko will cause the Anadarko Entities to provide such suitably qualified and experienced
Seconded Employees as it is able to make available to the General Partner, and the General Partner
will have the right to approve or reject each such Seconded Employee.

 -4- 

 

     v

     SECONDMENT SERVICES

I) Secondment Services. 

     Anadarko shall cause the Anadarko Entities to second Seconded Employees to the General Partner
to provide the General Partner with those services necessary to operate, manage, maintain and
report the operating results of the Partnership Assets (the “Secondment Services”).

II) Cancellation or Reduction of Secondment Services. 

     The General Partner may terminate or reduce the level of any of the Secondment Services on 30
days’ prior written notice to Anadarko. In the event the General Partner terminates the Secondment
Services, the General Partner shall pay Anadarko the monthly installment for the last month (or
portion thereof) in which it received such services. Upon payment thereof, the General Partner
shall have no further payment obligations. In the event that the General Partner reduces the level
of any of the Secondment Services, the Parties will negotiate in good faith to determine an
appropriate Services Reimbursement (as defined in Section 3.1 below) for the reduced Secondment
Services.

III) Workers’ Compensation.

     At all times, Anadarko will cause the Anadarko Entities to maintain workers’ compensation
insurance (either through an insurance company or self-insured arrangement) applicable to the
Seconded Employees. Anadarko will cause the Anadarko Entities to name the General Partner as an
also insured employer under such insurance policy. Prior to being assigned any duties by the
General Partner, each Seconded Employee must sign an acknowledgement that the Seconded Employee is
an employee during the Secondment Period of both the Anadarko Entities and the General Partner and
that for any work place injury, the Seconded Employee’s sole remedy will be under such Anadarko
Entity’s workers’ compensation insurance policy. Notwithstanding the foregoing, nothing herein
shall preclude a Seconded Employee from participating in benefit programs generally available to
employees of Anadarko Entities.

 -5- 

 

     v

     SERVICES REIMBURSEMENT

I) Operational, Management, Reporting and Routine Maintenance Expenses. 

     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 incurred by the Anadarko
Entities in connection with the performance of the Secondment Services during the preceding month
(the “Services Reimbursement”). The General Partner shall pay such invoice within 30 days of
receipt.

II) Seconded Employees. 

     Among other items, the Services Reimbursement shall include all reasonable cash expenses
incurred by the Anadarko Entities for the Seconded Employees, including, but not limited to:

A) compensation, salary and wages (including payroll and withholding taxes
associated therewith);

B) 401(k) costs and any matching 401(k) contributions;

C) vacation and sick leave benefits;

D) medical and health insurance benefits;

E) disability insurance;

F) workers’ compensation insurance;

G) life insurance;

H) severance payments, if any and

I) any other employee benefit for which the Anadarko Entities incur costs.

     The costs and expenses described in (a) through (i) above are referred to as “Seconded
Employee Expenses.” For the avoidance of any doubt, the Seconded Employee Expenses shall not
include any payments made to Seconded Employees under Anadarko’s Value Creation Plan (or any
successor plan thereto) and the excess of actual bonus amounts awarded under Anadarko’s Annual
Incentive Plan (“AIP”) to any Seconded Employee over 120% of such Seconded Employee’s AIP bonus
target (collectively, “Excess Bonus Expenses”). Where it is not reasonably practicable to
determine the cost of such a cost or expense, Anadarko or the applicable Anadarko Entity may make a
good faith reasonable estimate of such cost or expense (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

 -6- 

 

quarter). Anadarko or the applicable Anadarko Entity may include
the costs and expenses described in (b) through (i) above in a percentage benefit load based upon
the amount of costs and expenses incurred in (a) above. Subject to the parenthetical clause
included in this paragraph, the General Partner shall accept any estimate or benefit load described
in this paragraph, provided that such estimate is reasonable and made in good faith.

 -7- 

 

     v

     ALLOCATION; RECORDS; AGENT

I) Allocation; Records. 

     Anadarko will use commercially reasonable efforts to maintain an allocation schedule
reflecting the direct and indirect costs of the Seconded Employee Expenses based on the Secondment
Services. The General Partner will use commercially reasonable efforts to keep and maintain
books/records reflecting hours worked and costs and expenses incurred in connection with each of
the Seconded Employees, and Anadarko will have the right from time to time upon its reasonable
request to audit such books/records maintained by the General Partner. The General Partner and its
representatives will have the right to audit the allocation schedule and such other records as the
General Partner may reasonably require in connection with its verification of the Seconded Employee
Expenses during regular business hours and on reasonable prior notice. Based on these records, the
General Partner may request adjustments under Section 3.2 above.

II) Agent. 

     Seconded Employee Expenses remain the primary legal responsibility of the General Partner as
the employer of the Seconded Employees during the Secondment Period. Anadarko agrees to act as
agent for the General Partner in paying the Seconded Employee Expenses of the employees temporarily
assigned under this Secondment Agreement. Anadarko agrees to indemnify and hold the General
Partner harmless from any and all Losses incurred by the General Partner or any of the other
Partnership Entities related to Anadarko’s failure to carry out its duties as agent for the payment
of the Seconded Employee Expenses as set forth above, except to the extent that such Losses arise
solely out of or result solely from the negligence, gross negligence or willful misconduct of any
of the Partnership Entities.

 -8- 

 

     v

     TERM

     The term of this Agreement will commence on the Effective Date and will continue for an
initial period of 10 years. Upon the expiration of the initial 10 year period, the term of this
Agreement shall automatically extend for an additional 12 month period, unless either Party
provides at least 180 days’ prior written notice to the other Party, prior to the expiration of
such initial period, that the Party wishes for this Agreement to expire at the end of the initial
10 year period. After the initial 12 month renewal period, the term of this Agreement shall
automatically extend for additional 12 month periods, unless either Party provides prior written
notice, at least 180 days prior to the expiration of the applicable 12 month period, that the Party
wishes for this Agreement to expire at the end of such 12 month period. Upon proper notice by a
Party to the other Party, in accordance with this Article 5, that the Party wishes for this
Agreement to expire on the expiration of the applicable 10 year or 12 month period, this Agreement
shall not automatically extend, but shall instead expire upon the expiration of the applicable 10
year or 12 month period and only those provisions that, by their terms, expressly survive this
Agreement shall so survive. Notwithstanding the foregoing, the General Partner may terminate this
Agreement at any time, upon 180 days prior written notice to Anadarko, and only those provisions
that, by their terms, expressly survive this Agreement shall so survive.

 -9- 

 

     v

     GENERAL PROVISIONS

I) 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.

II) 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.

III) 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.

 -10- 

 

IV) 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.

V) Entire 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.

VI) 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 (as defined in Section 6.11 below) 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.

VII) 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.

VIII) 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.

IX) 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.

X) 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.

 -11- 

 

XI) Interpretation. 

     In this Agreement, unless a clear contrary intention appears: (a) the singular includes the
plural and vice versa; (b) reference to any individual, or any partnership, corporation, limited
liability company, trust or other legal entity (“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 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.”

XII) 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.

XIII) 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) As used in this Agreement, “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. 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.

XIV) 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.

 -12- 

 

XV) Time of the Essence. 

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

XVI) 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.

XVII) 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.

XVIII) 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.

XIX) 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.

XX) 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.

XXI) 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.

XXII) Dispute Resolution and Arbitration. 

A) Should a dispute arise between the Parties, the Parties shall promptly seek to
amicably resolve any such dispute by negotiations between the Parties prior to the
initiation of binding arbitration in accordance with Section 6.22(b). The Parties
shall meet at a mutually acceptable time and place within fifteen (15) days after
written notice by any Party to any other Party seeking resolution of a dispute under
this Section 6.22(a) and thereafter as often as they reasonably determine to be
necessary or appropriate to exchange relevant information and to attempt to resolve the
dispute. All negotiations and communications pursuant to this Section 6.22(a) shall be
treated and maintained by the Parties as confidential information and shall be treated
as compromise and settlement negotiations for purposes of the Federal Rules of
Evidence. Any proposed resolution of a dispute under this Agreement must be approved on
behalf of the

 -13- 

 

Partnership by the Special Committee of the Board of Directors of the
General Partner before it is finalized. If the matter is not resolved within 30 days
after the initial meeting of the Parties, or such longer period as may be mutually
agreed upon, either Party may initiate arbitration in accordance with Section 6.22(b).

B) Any disputes hereunder, including the inability of the Parties to agree to an
adjustment to the Services Reimbursements pursuant to the provisions of Section 3.1,
must be resolved through the use of binding arbitration using three arbitrators, in
accordance with the Commercial Arbitration Rules of the American Arbitration
Association, as supplemented to the extent necessary to determine any procedural appeal
questions by the Federal Arbitration Act (Title 9 of the United States Code). If there
is any inconsistency between this
Section and the Commercial Arbitration Rules or the Federal Arbitration Act, the
terms of this Section 6.22 will control the rights and obligations of the Parties.
Arbitration must be initiated within the applicable time limits set forth in this
Agreement and not thereafter or if no time limit is given, within the time period
allowed by the applicable statute of limitations. Arbitration may be initiated by a
party (“Claimant”) serving written notice on another party (“Respondent”) that the
Claimant elects to refer a particular dispute to binding arbitration. Claimant’s
notice initiating binding arbitration must identify the arbitrator Claimant has
appointed. The Respondent shall respond to Claimant within 30 days after receipt of
Claimant’s notice, identifying the arbitrator Respondent has appointed. If the
Respondent fails for any reason to name an arbitrator within the 30-day period,
Claimant shall petition to the American Arbitration Association for appointment of
an arbitrator for Respondent’s account. The two arbitrators so chosen shall select a
third arbitrator within 30 days after the second arbitrator has been appointed. The
Claimant will pay the compensation and expenses of the arbitrator named by or for
it, and the Respondent will pay the compensation and expenses of the arbitrator
named by or for it. The costs of petitioning for the appointment of an arbitrator,
if any, shall be paid by Respondent. The Claimant and Respondent will each pay
one-half of the compensation and expenses of the third arbitrator. All arbitrators
must (a) be neutral parties with no prior relationships to any participants,
parties, attorneys or law firms involved in the proceedings, (b) have never been
officers, directors or employees of any of the Partnership Entities or Anadarko
Entities and (c) have not less than seven years experience in the energy industry.
The hearing will be conducted in Fort Worth, Texas and commence within 30 days after
the selection of the third arbitrator. The Parties and the arbitrators should
proceed diligently and in good faith in order that the award may be made as promptly
as possible. Except as provided in the Federal Arbitration Act, the decision of the
arbitrators will be binding on and non-appealable by the Parties hereto. The
arbitrators shall have no right to grant or award indirect, consequential, punitive
or exemplary damages of any kind.

XXIII) Continuation of Work During Dispute. 

     Subject to Section 2.2 hereof, notwithstanding any dispute, it shall be the responsibility of
each Party to continue to perform its obligations under this Agreement pending resolution of the
dispute.

 -14- 

 

XXIV) Legal Compliance. 

     The Parties acknowledge and agree that this Agreement, and all services provided under this
Agreement, are intended to comply with any and all laws and legal obligations and that this
Agreement should be construed and interpreted with this purpose in mind. In this regard, the
Parties specifically agree as follows:

A) The Parties will comply with all equal employment opportunity requirements and
other applicable employment laws. Where a joint or combined action is required by the
law in order to comply with an employment obligation, the parties will cooperate fully
and in good faith to comply with the applicable obligation.

B) The General Partner acknowledges and agrees that Seconded Employees may utilize
the complaint reporting and resolution process of Anadarko and agrees to
cooperate in the investigation and resolution of any complaint that may be made.

C) The Parties agree that they will adhere to the Fair Labor Standards Act of
1938, as amended, any comparable state law and any law regulating the payment of wages
or compensation. The General Partner is solely responsible for ensuring that
non-exempt Seconded Employees accurately record their hours and time worked.

[Signature page follows]

 -15- 

 

     AS WITNESS HEREOF, the Parties have caused this Agreement to be executed by their duly
authorized representatives on the date herein above mentioned.

	 	 	 	 	 	 	 
	 	 	ANADARKO PETROLEUM CORPORATION	 	 
	 
	 	 	 	 	 	 
	 

	 	By:	 	 /s/ James T. Hackett	 	 
	 

	 	Name:
	 	 

James T. Hackett
	 	 
	 

	 	Title:
	 	Chairman, President and Chief	 	 
	 

	 	 	 	Executive Officer	 	 
	 
	 	 	 	 	 	 
	 	 	WESTERN GAS HOLDINGS, LLC	 	 
	 
	 	 	 	 	 	 
	 

	 	By:
	 	/s/ Robert G. Gwin	 	 
	 

	 	 	 	 	 	 
	 

	 	Name:
	 	Robert G. Gwin	 	 
	 

	 	Title:
	 	President and Chief Executive Officer	 	 

Signature Page to Services and Secondment Agreement

 

 

EXHIBIT A TO THE

SERVICES AND SECONDMENT AGREEMENT

     This Exhibit A is attached the Services and Secondment Agreement (the “Agreement”)
dated May 14, 2008 by and between Anadarko Petroleum Corporation and Western Gas Holdings, LLC.
All defined terms used herein shall have the same meaning as set forth in the Agreement.

     All information must be filled in for this form to be valid.

SECONDED EMPLOYEE SCHEDULE

	 	 	 	 	 
	Name of Seconded Employee	 	Title and Job Function	 	Start Date
	Mickey Bosarge

	 	Non-Employee
	 	May 14, 2008
	Jason Cochran

	 	Operator II
	 	May 14, 2008
	Tadd Dunnahoe

	 	Measurement Technician V
	 	May 14, 2008
	Marion Freeman

	 	Measurement Technician V
	 	May 14, 2008
	Timothy Hedrick

	 	Operator II
	 	May 14, 2008
	Michael Henry

	 	Construction Foreman
	 	May 14, 2008
	Kelly Hutchinson

	 	Sr. Foreman
	 	May 14, 2008
	Regie Judd

	 	Staff Autom & Mass Analyst
	 	May 14, 2008
	Raymond Martin

	 	Sr. Measurement Technician
	 	May 14, 2008
	Michael McGee

	 	Operator III
	 	May 14, 2008
	Perry Neill

	 	Field Foreman
	 	May 14, 2008
	Howard Pate

	 	Non-Employee
	 	May 14, 2008
	Wesley Robinson

	 	Mechanic IV
	 	May 14, 2008
	Russell Schick

	 	Operator II
	 	May 14, 2008
	Jerry Shoemaker

	 	Field Foreman
	 	May 14, 2008
	Stacy Stansbury

	 	Welder V
	 	May 14, 2008
	Ronnie Tanner

	 	Operator III
	 	May 14, 2008
	Mark Warren

	 	Operator II
	 	May 14, 2008
	Brock Whitney

	 	Sr. Measurement Technician
	 	May 14, 2008
	Daniel Winkler

	 	Mechanic III
	 	May 14, 2008
	Jyl Baumann

	 	Field Analyst II
	 	May 14, 2008
	John Curtis

	 	Field Supv
	 	May 14, 2008
	Mark Diede

	 	Sr. Measurement Technician
	 	May 14, 2008
	Brad Engler

	 	Corrosion Technician I
	 	May 14, 2008

 

 

	 	 	 	 	 
	Name of Seconded Employee	 	Title and Job Function	 	Start Date
	Curtis Hyde

	 	Measurement Technician I
	 	May 14, 2008
	Ellory Mills

	 	Corrosion Technician IV
	 	May 14, 2008
	Robert Schmitz

	 	Area Supt
	 	May 14, 2008
	Ryan Smith

	 	Measurement Technician II
	 	May 14, 2008
	Russell Steiner

	 	Measurement Technician IV
	 	May 14, 2008
	Kerrie Strickland

	 	General Laborer II
	 	May 14, 2008
	Tracy Zimbelman

	 	Operations Specialist II
	 	May 14, 2008
	Gary Allen

	 	Sr. Field Analyst
	 	May 14, 2008
	Dennis Atkins

	 	Fieldman IV
	 	May 14, 2008
	Martin Banning

	 	Sr. Maintenance Foreman
	 	May 14, 2008
	Gary Biehm

	 	Plant Operator V
	 	May 14, 2008
	Thomas Bohannon

	 	Fieldman IV
	 	May 14, 2008
	Ronald Boone

	 	Pipeline Foreman
	 	May 14, 2008
	David Boothby

	 	Sr. Fieldman
	 	May 14, 2008
	Stacy Burrows

	 	Mechanic V
	 	May 14, 2008
	Donald Burrows

	 	Measurement Technician V
	 	May 14, 2008
	Heath Cain

	 	Fieldman III
	 	May 14, 2008
	David Conner

	 	Fieldman V
	 	May 14, 2008
	Troy Cooper

	 	Fieldman V
	 	May 14, 2008
	Lloyd Dixon

	 	Measurement Technician III
	 	May 14, 2008
	Alfred Eddy

	 	Sr. Plant Operator
	 	May 14, 2008
	Timothy Evans

	 	Field Foreman
	 	May 14, 2008
	Eugene Graves

	 	Sr. Field Analyst
	 	May 14, 2008
	Tracy Gutierrez

	 	Measurement Technician IV
	 	May 14, 2008
	James Hammerschmidt

	 	Construction Foreman
	 	May 14, 2008
	Jack Hasik

	 	Sr. Mechanic
	 	May 14, 2008
	Alan Hanna

	 	Sr. Field Analyst
	 	May 14, 2008
	Albert Hodges

	 	Area Supt
	 	May 14, 2008
	Howard Hunter

	 	Field V
	 	May 14, 2008
	Russell Jays

	 	General Laborer II
	 	May 14, 2008
	Robert Jones

	 	Sr. Measurement Technician
	 	May 14, 2008
	John Keeter

	 	Fieldman IV
	 	May 14, 2008
	Jimmy Kelley

	 	Fieldman V
	 	May 14, 2008
	Paula Koski

	 	Measurement Technician IV
	 	May 14, 2008
	John Lear

	 	Fieldman IV
	 	May 14, 2008

 

 

	 	 	 	 	 
	Name of Seconded Employee	 	Title and Job Function	 	Start Date
	Stuart Lujan

	 	Fieldman V
	 	May 14, 2008
	Larry Martin

	 	Sr. Field Analyst
	 	May 14, 2008
	Trent McCabe

	 	Fieldman III
	 	May 14, 2008
	Jerry Merwin

	 	Fieldman IV
	 	May 14, 2008
	Harry Mills

	 	Field Foreman
	 	May 14, 2008
	Jeff Mills

	 	Plant Operator V
	 	May 14, 2008
	Trenton Milton

	 	Mechanic V
	 	May 14, 2008
	Phillip Mitchell

	 	Pipeline Foreman
	 	May 14, 2008
	Dawn Nease

	 	Sr. Measurement Foreman
	 	May 14, 2008
	Michael Pond

	 	Sr. Field Analyst
	 	May 14, 2008
	Enrique Reza

	 	Fieldman III
	 	May 14, 2008
	Robert Rich

	 	Mechanic IV
	 	May 14, 2008
	Ronald Rich

	 	Mechanic III
	 	May 14, 2008
	Pat Rich

	 	Non-Employee
	 	May 14, 2008
	Jason Robertson

	 	Fieldman I
	 	May 14, 2008
	Richard Robinson

	 	Measurement Technician IV
	 	May 14, 2008
	Edward Rutledge

	 	Fieldman IV
	 	May 14, 2008
	Steven Savely

	 	Fieldman I
	 	May 14, 2008
	Tommy Silva

	 	Fieldman IV
	 	May 14, 2008
	Ronald Simmons

	 	Plant Operator V
	 	May 14, 2008
	Kathy Slaughter

	 	Fieldman IV
	 	May 14, 2008
	Greg Steizler

	 	Measurement Technician IV
	 	May 14, 2008
	Rodney Stout

	 	Sr. Measurement Technician
	 	May 14, 2008
	Jerry Stricker

	 	Fieldman V
	 	May 14, 2008
	Trevor Thompson

	 	Fieldman III
	 	May 14, 2008
	Jerry Trout

	 	Operator V
	 	May 14, 2008
	William Trujillo

	 	Measurement Technician IV
	 	May 14, 2008
	Danny Walls

	 	Mechanic IV
	 	May 14, 2008
	Jay Williams

	 	Fieldman IV
	 	May 14, 2008
	Donald Williams

	 	Sr. Mechanic
	 	May 14, 2008
	Jerry Arnold

	 	Operations Technician IV
	 	May 14, 2008
	Conard Baker

	 	Automation Foreman
	 	May 14, 2008
	Christopher Bettencourt

	 	Plant Operator III
	 	May 14, 2008
	Joshua Brittain

	 	Plant Operator III
	 	May 14, 2008
	Josh Deen

	 	Non-Employee
	 	May 14, 2008

 

 

	 	 	 	 	 
	Name of Seconded Employee	 	Title and Job Function	 	Start Date
	Simmie Douglas

	 	Operations Technician V
	 	May 14, 2008
	Donald Gill

	 	Plant Operator V
	 	May 14, 2008
	Cory Hearrell

	 	Plant Operator IV
	 	May 14, 2008
	Judy Hill

	 	Non-Employee
	 	May 14, 2008
	David Hinson

	 	Sr. Foreman
	 	May 14, 2008
	Jeffrey Karh

	 	Operations Technician V
	 	May 14, 2008
	Brian Lookabaugh

	 	Plant Operator I
	 	May 14, 2008
	Larry Martin

	 	E&I Technician IV
	 	May 14, 2008
	Mitchell McSwain

	 	Plant Foreman
	 	May 14, 2008
	Rodd Pagel

	 	Plant Operator V
	 	May 14, 2008
	Charles Pickens

	 	Operations Technician IV
	 	May 14, 2008
	Joshua Richardson

	 	Automation Tech III
	 	May 14, 2008
	Alan Rummel

	 	Measurement Technician IV
	 	May 14, 2008
	Tommy Sawyer

	 	Mechanic V
	 	May 14, 2008
	Steven Shaw

	 	Sr. Operations Technician
	 	May 14, 2008
	Michael South

	 	Plant Operator V
	 	May 14, 2008
	Ronald Warren

	 	Field Analyst II
	 	May 14, 2008
	Jared Weakley

	 	Plant Operator III
	 	May 14, 2008
	William Woodruff

	 	Field Foreman
	 	May 14, 2008
	Jonathan Bishop

	 	Mechanic III
	 	May 14, 2008
	Jonathan Bishop

	 	Mechanic III
	 	May 14, 2008
	Jim Hartley

	 	Production Supt
	 	May 14, 2008
	Jim Hartley

	 	Production Supt
	 	May 14, 2008
	Cale Jensen

	 	E&I Technician I
	 	May 14, 2008
	Cale Jensen

	 	E&I Technician I
	 	May 14, 2008
	Michael Johansen

	 	Mechanic IV
	 	May 14, 2008
	Michael Johansen

	 	Mechanic IV
	 	May 14, 2008
	Kirt Rasmussen

	 	Field Foreman
	 	May 14, 2008
	Kirt Rasmussen

	 	Field Foreman
	 	May 14, 2008
	Kevin Whitmer

	 	E&I Technician IV
	 	May 14, 2008
	Kevin Whitmer

	 	E&I Technician IV
	 	May 14, 2008
	Bobby Hess

	 	Sr. Foreman
	 	May 14, 2008
	Leroy Hutson

	 	Operator V
	 	May 14, 2008
	Jackie Pender

	 	Field Services Analyst II
	 	May 14, 2008

[Signature page follows]

 

 

	 	 	 	 	 	 	 	 	 	 	 
	ANADARKO PETROLEUM CORPORATION	 	 	 	WESTERN GAS HOLDINGS, LLC	 	 
	 
	 	 	 	 	 	 	 	 	 	 
	By:

	 	/s/ James T. Hackett
	 	 	 	By:
	 	/s/ Robert G. Gwin	 	 
	Name:

	 	 

James T. Hackett
	 	 	 	Name:
	 	 

Robert G. Gwin
	 	 
	Title:

	 	Chairman, President and Chief
	 	 	 	Title:
	 	President and Chief Executive Officer	 	 
	 

	 	Executive Officer	 	 	 	 	 	 	 	 

 

 

EXHIBIT B TO THE

SERVICES AND SECONDMENT AGREEMENT

     This Exhibit B is attached the Services and Secondment Agreement (the “Agreement”)
dated [                    ], [                    ] by and between Anadarko Petroleum Corporation and Western Gas
Holdings, LLC. All defined terms used herein shall have the same meaning as set forth in the
Agreement.

ADDITION/REMOVAL/CHANGE OF RESPONSIBILITY

OF SECONDED EMPLOYEE

     In accordance with Section 1.1 of the Secondment Agreement, the Parties hereto wish to add,
remove, or change the responsibilities of the following Seconded Employees.

     All information must be filled in for this form to be valid.

	 	 	 	 	 	 	 	 	 	 	 	 	 
	Name of Seconded	 	 	 	 	 	 	 	 	 
	Employee	 	Title and Job Function	 	 	Start Date	 	 	End Date	 
	 
	 	 	 	 	 	 	 	 	 	 	 	 

	 	 	 	 	 	 	 	 	 	 	 
	ANADARKO PETROLEUM CORPORATION	 	 	 	WESTERN GAS HOLDINGS, LLC	 	 
	 
	 	 	 	 	 	 	 	 	 	 
	By:

	 	 	 	 	 	By:	 	 	 	 
	Name:

	 	 

	 	 	 	Name:
	 	 

	 	 
	Title:

	 	 	 	 	 	Title:
	 	[President]

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