Document:

EX-10.1

 Exhibit 10.1 

OMNIBUS AGREEMENT 

among 
 WESTLAKE
MANAGEMENT SERVICES, INC. 
 WESTLAKE CHEMICAL PARTNERS GP LLC 

WESTLAKE CHEMICAL PARTNERS LP 

WESTLAKE CHEMICAL OPCO GP LLC 

WESTLAKE CHEMICAL OPCO LP 

WPT LLC 
 WESTLAKE
LONGVIEW CORPORATION 
 WESTLAKE PETROCHEMICALS LLC 

WESTLAKE VINYLS, INC. 

WESTLAKE PVC CORPORATION 

WESTLAKE STYRENE LLC 

WESTLAKE POLYMERS LLC 

and 
 WESTLAKE VINYL
CORPORATION 

 TABLE OF CONTENTS 

 

							
	 ARTICLE I
	 	 DEFINITIONS; CONSTRUCTION
	  	 	1	  
	 Section 1.1
	 	 Definitions
	  	 	1	  
	 Section 1.2
	 	 Construction
	  	 	8	  
			
	 ARTICLE II
	 	 INDEMNIFICATION
	  	 	8	  
	 Section 2.1
	 	 Environmental Indemnification
	  	 	8	  
	 Section 2.2
	 	 Additional Indemnification
	  	 	9	  
	 Section 2.3
	 	 Consequential Damages
	  	 	11	  
	 Section 2.4
	 	 Indemnification Procedures
	  	 	11	  
			
	 ARTICLE III
	 	 SERVICES
	  	 	12	  
	 Section 3.1
	 	 Scope of Services
	  	 	12	  
	 Section 3.2
	 	 Exclusion of Services
	  	 	12	  
	 Section 3.3
	 	 Performance of Services by Affiliates or Other Persons
	  	 	12	  
	 Section 3.4
	 	 Payment Amount
	  	 	12	  
	 Section 3.5
	 	 Payment of the Payment Amount
	  	 	14	  
	 Section 3.6
	 	 Disputed Charges
	  	 	14	  
	 Section 3.7
	 	 Employees
	  	 	14	  
	 Section 3.8
	 	 Limitation of Duties and Liability
	  	 	14	  
			
	 ARTICLE IV
	 	 RIGHT OF FIRST REFUSAL
	  	 	15	  
	 Section 4.1
	 	 Westlake Right of First Refusal
	  	 	15	  
	 Section 4.2
	 	 Procedures
	  	 	15	  
			
	 ARTICLE V
	 	 REPRESENTATIONS AND WARRANTIES
	  	 	17	  
	 Section 5.1
	 	 Representations by the Westlake Parties
	  	 	17	  
	 Section 5.2
	 	 Representations by Partnership Entities
	  	 	18	  
			
	 ARTICLE VI
	 	 INSURANCE
	  	 	19	  
	 Section 6.1
	 	 Westlake Insurance
	  	 	19	  
	 Section 6.2
	 	 MLP Insurance
	  	 	21	  
	 Section 6.3
	 	 Certificates; Proof of Loss
	  	 	22	  
	 Section 6.4
	 	 Payment of Deductible Amounts
	  	 	22	  
	 Section 6.5
	 	 Contractor’s Insurance
	  	 	22	  
			
	 ARTICLE VII
	 	 CONFIDENTIAL INFORMATION
	  	 	24	  
	 Section 7.1
	 	 Information
	  	 	24	  
	 Section 7.2
	 	 Definition
	  	 	24	  
	 Section 7.3
	 	 Legal Requirement
	  	 	24	  
	 Section 7.4
	 	 Survival
	  	 	25	  
			
	 ARTICLE VIII
	 	 INTELLECTUAL PROPERTY
	  	 	25	  
	 Section 8.1
	 	 Ownership by the Westlake Entities and License to MLP
	  	 	25	  
	 Section 8.2
	 	 License to the Westlake Entities and their Affiliates
	  	 	25	  

  
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	 ARTICLE IX        
	 	 TERM; MISCELLANEOUS
	  	 	25	  
	 Section 9.1
	 	 Term
	  	 	25	  
	 Section 9.2
	 	 Choice of Law; Submission to Jurisdiction
	  	 	25	  
	 Section 9.3
	 	 Dispute Resolution
	  	 	26	  
	 Section 9.4
	 	 Notice
	  	 	27	  
	 Section 9.5
	 	 Entire Agreement
	  	 	27	  
	 Section 9.6
	 	 Amendment or Modification
	  	 	28	  
	 Section 9.7
	 	 Assignment
	  	 	28	  
	 Section 9.8
	 	 Counterparts
	  	 	28	  
	 Section 9.9
	 	 Severability
	  	 	28	  
	 Section 9.10
	 	 Further Assurances
	  	 	28	  
	 Section 9.11
	 	 No Waiver
	  	 	28	  
	 Section 9.12
	 	 Set Off
	  	 	28	  
	 Section 9.13
	 	 Rights of Third Parties
	  	 	28	  

  

			
	Schedule I	 	 Westlake Complexes

		
	Schedule II	 	 Services

  
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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 Westlake Management Services Inc., a Delaware corporation (“Westlake Services”), Westlake Chemical Partners GP LLC, a Delaware limited liability company (“GP”), Westlake Chemical Partners LP, a Delaware
limited partnership (the “MLP”), Westlake Chemical OpCo GP LLC, a Delaware limited liability company (“Operating GP”), Westlake Chemical OpCo LP, a Delaware limited partnership (“OpCo”), WPT LLC, a
Delaware limited liability company (“WPT”), Westlake Longview Corporation, a Delaware Corporation (“Westlake Longview”), Westlake Petrochemicals LLC, a Delaware limited liability company (“Westlake
Petrochemicals”), Westlake Vinyls, Inc., a Delaware corporation (“Westlake Vinyls”, and together with WPT, Westlake Longview and Westlake Petrochemicals, the “Westlake Contributors”), Westlake PVC
Corporation, a Delaware corporation (“Westlake PVC”), Westlake Styrene LLC, a Delaware limited liability company (“Westlake Styrene”), Westlake Polymers LLC, a Delaware limited liability company (“Westlake
Polymers”), and Westlake Vinyl Corporation, a Delaware corporation (“Vinyl Corporation” and together with Westlake Styrene, Westlake Polymers and the Westlake Contributors, the “Westlake Complex Parties”).
The above-named entities are sometimes referred to in this Agreement each as a “Party” and collectively as the “Parties.” 

RECITALS: 
 Certain of the
Parties have entered into the Related Agreements (as defined below), and in connection therewith, the Parties desire by their execution of this Agreement to evidence their agreement with respect to certain obligations of the Parties, as more fully
set forth herein. 
 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; CONSTRUCTION 

Section 1.1 Definitions. As used in this Agreement, the following terms shall have the respective meanings set forth below:

 “Acquisition Proposal” is defined in Section 4.2(a). 

“Administrative Personnel” means individuals who are employed by the Westlake Parties or any of their Affiliates and assist
in providing, as part of the Services, any of the administrative services referred to in Schedule II hereto. 

“Affiliate” means (i) with respect to Westlake, any other Person that directly or indirectly through one or more
intermediaries controls, is controlled by Westlake, excluding GP and any other Person that directly or indirectly through one or more intermediaries is controlled by GP; (ii) with respect to the Partnership Entities, any Person that directly or
indirectly through one or more intermediaries is controlled by GP; (iii) with respect to any other Person, any other Person that directly or indirectly through one or more intermediaries controls, is controlled by or is

  
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under common control with such first Person. As used herein, the term “control” means the possession, directly or indirectly, 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. 

“Agreement” is defined in the introduction to this Agreement. 

“Applicable Laws” means all statutes, regulations, rules, ordinances, codes, licenses, permits, orders, approvals and rules
of common law of each Governmental Authority having jurisdiction over the Parties, including Environmental Laws, all health, building, fire, safety and other codes, ordinances and requirements and all applicable standards of the National Board of
Fire Underwriters, in each case, as amended, and any judicial or administrative interpretation thereof, including any judicial or administrative order, consent, decree, judgment or settlement; in each case, as applicable to the Westlake Parties, the
Partnership Entities, the Assets or the Westlake Complexes, as the case may be. 
 “Asset Contribution Agreement” means
that certain Contribution, Conveyance and Assumption Agreement, dated as of the Closing Date, among the Westlake Contributors, GP, the MLP, Operating GP, OpCo and certain other parties, together with the additional conveyance documents and
instruments contemplated or referenced thereunder. 
 “Assets” means all assets conveyed, contributed, or otherwise
transferred by the Westlake Entities to the Partnership Entities prior to or on the Closing Date pursuant to the Asset Contribution Agreement. 

“Business” is defined in Section 3.1. 

“Business Day” means any day other than a Saturday, a Sunday or a holiday on which banking institutions in the State of Texas
are closed. 
 “Change in Law” shall mean the occurrence, after the date of this Agreement, of any of the following:
(a) the adoption or taking into effect of any law, treaty, order, policy, rule or regulation, (b) any change in any law, treaty, order, policy, rule or regulation or in the administration, interpretation or application thereof by any
Governmental Authority or (c) the making or issuance of any request, guideline or directive (whether or not having the force of law) by any Governmental Authority. 

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

“Common Units” is defined in the Partnership Agreement. 

“Confidential Information” is defined in Section 7.2. 

“Conflicts Committee” is defined in the Partnership Agreement. 

  
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 “Dedicated Personnel” means individuals, other than Administrative Personnel,
who are employed by the Westlake Parties or any of their Affiliates and provided on a full-time basis to the Partnership Group in connection with provision of the Services. 

“Default Rate” shall mean an interest rate, compounded on a monthly basis, at the rate per annum equal to the one-month term,
London Interbank Offered Rate (LIBOR rate) for U.S. dollar deposits, plus two percentage points per annum, applicable on the first Business Day prior to the due date of payment and thereafter on the first Business Day of each succeeding month;
provided, however, that the Default Rate shall never exceed the maximum rate permitted by applicable Law. 
 “Disposition
Notice” is defined in Section 4.2(a). 
 “dispute” shall have the meaning set out in
Section 9.3(a). 
 “Environmental Law” means any and all Applicable Laws pertaining to (i) pollution,
protection of the environment (including natural resources), or workplace health and safety, (ii) any Release, threatened Release or exposure of any Person or property to Hazardous Substances, or (iii) the generation, manufacture,
processing, distribution, use, treatment, storage, disposal, transport, arrangement for disposal or transport, or handling of Hazardous Substances. Without limiting the foregoing, Environmental Laws include the Comprehensive Environmental Response,
Compensation and Liability Act, 42 U.S.C. § 9601 et seq., the Resource Conservation and Recovery Act, 42 U.S.C. § 6901 et seq.; the Federal Water Pollution Control Act, 33 U.S.C. § 1251 et seq.; the Clean Air Act, 42 U.S.C. §
7401 et seq.; the Hazardous Materials Transportation Act, 49 U.S.C. § 5101 et seq.; the Toxic Substances Control Act, 15 U.S.C. §§ 2601 et seq.; the Oil Pollution Act, 33 U.S.C. § 2701 et seq.; the Emergency Planning and
Community Right-to-Know Act, 42 U.S.C. § 11001 et seq.; the Safe Drinking Water Act, 42 U.S.C. §§ 300f through 300j; the Occupational Safety and Health Act, 29 U.S.C. § 651 et seq.; and all similar Applicable Laws of any
Governmental Authority having jurisdiction over the Assets, the Westlake Complexes or their respective operations, and all amendments to such Applicable Laws and all regulations implementing any of the foregoing. 

“Environmental Liabilities” or “Environmental Liability” shall mean any liabilities, claims or causes of
action (including environmental and Toxic Tort exposure claims or causes of action), demands, losses (including diminution in value suffered by third parties), damages (including real property damages, personal property damages, and natural resource
damages), injuries (including personal injury and death), judgments, settlements, fines, penalties, sanctions, supplemental environmental projects, costs (including costs for Remediation), and expenses (including environmental or Toxic Tort
pre-trial, trial or appellate legal or litigation support work, court costs and reasonable and documented attorneys’, experts’ and consultants’ fees, charges and disbursements) of any and every kind or character, known or unknown,
fixed or contingent. 
 “ERISA” means the Employee Retirement Income Security Act of 1974, as amended. 

  
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 “ERISA Affiliate” means each entity which is or has been treated as a single
employer with the Westlake Parties and their Affiliates for purposes of Section 414 of the Code or Section 4001(a)(14) of ERISA. 

“Ethylene Sales Agreement” means the Ethylene Sales Agreement among OpCo, and certain Affiliates of Westlake dated of even
date herewith, as the same may be amended. 
 “Exchange Act” means the Securities Exchange Act of 1934, as amended. 

“Feedstock Supply Agreement” means the Feedstock Supply Agreement between Westlake Petrochemicals and OpCo dated of even date
herewith, as the same may be amended. 
 “First ROFR Acceptance Deadline” is defined in Section 4.2(a). 

“Governmental Authority” means any governmental authority, agency, department, commission, bureau, board, instrumentality,
court or quasi-governmental authority of the United States, or any state that has or obtains jurisdiction over the matter in question, or any political subdivision thereof. 

“GP” is defined in the introduction to this Agreement. 

“Hazardous Substances” means and includes any substance that, by its nature or its use, is regulated or as to which liability
might arise under any Environmental Law including each substance defined, designated or classified as a hazardous waste, solid waste, hazardous substance, hazardous material, pollutant, contaminant or toxic substance under any Environmental Law and
any petroleum, petroleum products, petroleum hydrocarbons, whether refined or unrefined, crude oil or any fractions or derivatives thereof, asbestos, radioactive materials, urea formaldehyde foam insulation, polychlorinated biphenyls, and radon gas.

 “Indemnified Party” means the Partnership Entities or the Westlake Parties and their Affiliates, as the case may be, in
their capacity as the parties entitled to indemnification in accordance with Article II. 
 “Indemnifying
Party” means either the Partnership Entities or Westlake, as the case may be, in their capacity as the parties from whom indemnification may be required in accordance with Article II. 

“Lender” means any Person providing financing with respect to the Assets. 

“Limited Partner” is defined in the Partnership Agreement. 

“Losses” is defined in Section 2.2(d). 

“MLP” is defined in the introduction to this Agreement. 

“Offer Price” is defined in Section 4.2(a). 

“OpCo” is defined in the introduction to this Agreement. 

  
 4 

 “Operating GP” is defined in the introduction to this Agreement. 

“Partnership Agreement” means the First Amended and Restated Agreement of Limited Partnership of Westlake Chemical Partners
LP, 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. No amendment or modification to the Partnership Agreement subsequent to the Closing Date
shall be given effect for the purposes of this Agreement unless consented to by each of the Parties to this Agreement. 

“Partnership Entities” means GP and each member of the Partnership Group; and “Partnership Entity” means any
of the Partnership Entities. 
 “Partnership Group” means the MLP, Operating GP, OpCo and any Subsidiary of any such
Person, treated as a single consolidated entity. 
 “Partnership Group Member” means any member of the Partnership Group.

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

“Person” means an individual or a corporation, limited liability company, partnership, joint venture, trust, unincorporated
organization, association, or Governmental Authority. 
 “Personnel Costs” means all compensation costs incurred by an
employer in connection with the employment by such employer of applicable personnel, including all payroll and benefits. 

“Pre-Closing Environmental Liabilities” means any and all Environmental Liabilities by reason of or arising out of any acts,
omissions or conditions to the extent occurring or existing before the Closing Date associated with the Westlake Complexes or the Assets that constitute or result in (i) a violation of or any non-compliance with or liability under Environmental
Laws in effect before the Closing Date that are applicable to the Westlake Complexes or the Assets, (ii) a Release or threatened Release of, or exposure to, a Hazardous Substance at, under, on or from or to the Westlake Complexes or the Assets
or arising out of operation of the Westlake Complexes or the Assets (including the Release or threatened Release of, or exposure to, Hazardous Substances on, under, or from real properties offsite the Westlake Complexes and Assets where such
Hazardous Substances were transported or disposed, or arranged to be transported or disposed as a result of or in connection with operations at the Westlake Complexes or the Assets) as to which Environmental Laws in effect before the Closing Date
impose liability or require Remediation or (iii) any actual or threatened claims, demands, causes of action, actions or proceedings by or before any Person or Governmental Authority alleging potential liability under any Environmental Laws in
effect before the Closing Date. 
 “Post-Closing Environmental Liabilities” means any and all Environmental Liabilities by
reason of or arising out of any acts, omissions or conditions to the extent occurring or existing on or after the Closing Date associated with the Assets that constitute or result in (i) a violation of or any non-compliance with or liability
under Environmental Laws in effect on or after the Closing Date that are applicable to the Assets, (ii) a Release or threatened Release of, or exposure to, a Hazardous Substance at, under, on or from or to the Assets, or arising out of

  
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operation of the Assets (including the Release or threatened Release of, or exposure to, Hazardous Substances on, under, or from real properties offsite the Assets where such Hazardous Substances
were transported or disposed, or arranged to be transported or disposed as a result of or in connection with operations at the Assets) as to which Environmental Laws in effect on or after the Closing Date impose liability or require Remediation or
(iii) any actual or threatened claims, demands, causes of action, actions or proceedings by or before any Person or Governmental Authority alleging potential liability under any Environmental Laws in effect on or after the Closing Date. 

“Proposed Transferee” is defined in Section 4.2(a). 

“Recipient” is defined in Section 7.1. 

“Related Agreements” means the Ethylene Sales Agreement, the Feedstock Supply Agreement, the Services Agreement and the Site
Lease Agreements. 
 “Release” any releasing, depositing, spilling, leaking, pumping, pouring, placing, emitting,
discarding, abandoning, emptying, discharging, migrating, injecting, escaping, leaching, dumping, or disposing. 

“Remediation” shall mean any investigation, study, assessment, evaluation, sampling, testing, monitoring, containment,
removal or removal action, disposal, closure, corrective action, remediation or remedial action (regardless of whether active or passive), natural attenuation, restoration, bioremediation, response, repair, corrective measure, cleanup, or abatement
that is required under any Environmental Law. 
 “Retained Assets” means the facilities owned by any of the Westlake
Entities that were not conveyed, contributed or otherwise transferred to the Partnership Group pursuant to the Asset Contribution Agreement. 

“ROFR Acceptance Deadline” means the First ROFR Acceptance Deadline or the Second ROFR Acceptance Deadline, as applicable.

 “Sale Assets” is defined in Section 4.2(a). 

“Second ROFR Acceptance Deadline” is defined in Section 4.2(a). 

“Seller” is defined in Section 4.2(a). 

“Services” is defined in Section 3.1. 

“Services Agreement” means the Services Agreement among OpCo and certain Affiliates of Westlake dated of even date herewith,
as the same may be amended. 
 “Share-Based Compensation” means any compensation accruing or payable under any incentive or
other compensation plan or program of an employer based upon changes in the equity value of such employer or any of its Affiliates (but excluding the MLP and its subsidiaries). 

  
 6 

 “Shared Personnel” means individuals, other than Administrative Personnel, who
are employed by the Westlake Parties or any of their Affiliates and provided on a part-time basis to the Partnership Group in connection with provision of the Services. 

“Site Lease Agreements” means the Site Lease Agreements between OpCo and certain Affiliates of Westlake dated of even date
herewith, as the same may be amended. 
 “Subsidiary” means, with respect to any Person, (a) 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, (b) a partnership (whether general or limited) in which such Person or a Subsidiary of such Person is, at the date of determination, a general
partner of such partnership, but only if such Person, directly or by one or more Subsidiaries of such Person, or a combination thereof, controls such partnership on the date of determination or (c) any other Person in which such Person, one or
more Subsidiaries of such Person, or a combination thereof, directly or indirectly, at the date of determination, has (i) a majority ownership interest or (ii) the power to elect or direct the election of a majority of the directors or
other governing body of such Person. 
 “Toxic Tort” means a claim or cause of action alleging personal injury or property
damage incurred by the plaintiff that is alleged to have been caused by exposure to, or contamination by, Hazardous Substances that have been released into the environment by or as a result of the actions or omissions of the defendant. 

“Transfer” including the correlative terms “Transferring” or “Transferred” means any direct
or indirect transfer, assignment, sale, gift, pledge, hypothecation or other encumbrance, or any other disposition (whether voluntary, involuntary or by operation of law). 

“Units” is defined in the Partnership Agreement. 

“Voting Securities” means securities of any class of a Person entitling the holders thereof to vote on a regular basis in the
election of members of the board of directors or other governing body of such Person. 
 “Westlake” means Westlake Chemical
Corporation, a Delaware corporation. 
 “Westlake Entities” means any Person controlled, directly or indirectly, by
Westlake other than the Partnership Entities; and “Westlake Entity” means any of the Westlake Entities. 

“Westlake Complexes” means the petrochemical production facilities owned by Westlake and located in Calvert City, Kentucky
and Lake Charles, Louisiana, as more particularly described on Schedule I to this Agreement, but excluding the Assets. 

“Westlake Complex Parties” is defined in the introduction to this Agreement. 

“Westlake Contributors” is defined in the introduction to this Agreement. 

  
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 “Westlake Parties” means any Westlake Entity party to this Agreement. 

“Westlake Post-Closing Environmental Liabilities” means any and all Environmental Liabilities by reason of or arising out of
any acts, omissions or conditions to the extent occurring or existing on or after the Closing Date associated with the Westlake Complexes that constitute or result in (i) a violation of or any non-compliance with or liability under
Environmental Laws in effect on or after the Closing Date that are applicable to the Westlake Complexes, (ii) a Release or threatened Release of, or exposure to, a Hazardous Substance at, under, on or from or to the Westlake Complexes, or
arising out of operation of the Westlake Complexes (including the Release or threatened Release of, or exposure to, Hazardous Substances on, under, or from real properties offsite the Westlake Complexes where such Hazardous Substances were
transported or disposed, or arranged to be transported or disposed as a result of or in connection with operations at the Westlake Complexes) as to which Environmental Laws in effect on or after the Closing Date impose liability or require
Remediation or (iii) any actual or threatened claims, demands, causes of action, actions or proceedings by or before any Person or Governmental Authority alleging potential liability under any Environmental Laws in effect on or after the
Closing Date. 
 Section 1.2 Construction. In construing this Agreement, the following principles shall be followed:
(i) no consideration shall be given to the captions of articles, sections or subsections; (ii) no consideration shall be given to the fact or presumption that one Party had a greater or lesser hand in drafting this Agreement;
(iii) the word “includes” and its syntactic variants means “includes, but is not limited to” and corresponding syntactic variant expressions; and (iv) the plural shall be deemed to include the singular,
and vice versa. 
 ARTICLE II 

INDEMNIFICATION 

Section 2.1 Environmental Indemnification. 

(a) The Westlake Contributors agree to indemnify, defend and hold harmless the Partnership Entities and their respective officers, directors
and employees from and against any and all Pre-Closing Environmental Liabilities, incurred by or asserted against Partnership Entities; provided that the Partnership Entities shall use commercially reasonable efforts to mitigate any such cost, but
failure to use such commercially reasonable efforts shall not limit the Partnership Entities’ rights to indemnification hereunder, except to the extent the Westlake Contributors are prejudiced thereby. 

(b) So long as any Related Agreement remains in effect, the Partnership Entities agree to indemnify, defend and hold harmless the Westlake
Contributors and their Affiliates, and their respective officers, directors and employees, from and against any and all Post-Closing Environmental Liabilities, incurred by or asserted against the Westlake Contributors or any of their Affiliates;
provided that the Westlake Contributors shall use commercially reasonable efforts to mitigate any such cost, but failure to use such commercially reasonable efforts shall not limit the Westlake Contributors’ rights to indemnification hereunder,
except to the extent the Partnership Entities are prejudiced thereby. 

  
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 (c) So long as any Related Agreement remains in effect, the Westlake Complex Parties agree to
indemnify, defend and hold harmless the Partnership Entities, and their respective officers, directors and employees, from and against any and all Westlake Post-Closing Environmental Liabilities, incurred by or asserted against the Partnership
Entities; provided that the Partnership Entities shall use commercially reasonable efforts to mitigate any such cost, but failure to use such commercially reasonable efforts shall not limit the Partnership Entities’ rights to indemnification
hereunder, except to the extent the Westlake Complex Parties are prejudiced thereby. 
 (d) So long as any Related Agreement remains in
effect, the Partnership Entities agree to indemnify, defend and hold harmless the Westlake Complex Parties, and their respective officers, directors and employees, from and against any and all Environmental Liabilities (other than Pre-Closing
Environmental Liabilities or Westlake Post-Closing Environmental Liabilities), incurred by or asserted against the Westlake Complex Parties; provided that the Westlake Complex Parties shall use commercially reasonable efforts to mitigate any such
cost, but failure to use such commercially reasonable efforts shall not limit the Westlake Complex Parties’ rights to indemnification hereunder, except to the extent the Partnership Entities are prejudiced thereby. 

Section 2.2 Additional Indemnification. 

(a) The Westlake Parties shall indemnify, defend, and hold harmless the Partnership Entities from and against any losses, damages,
liabilities, claims, demands, causes of action, judgments, settlements, fines, penalties, and reasonable costs and expenses (including court costs and reasonable attorneys’ and experts’ fees) of any and every kind or character, known or
unknown, fixed or contingent, suffered or incurred by the Partnership Entities by reason of or arising out of claims asserted by any third party with respect to (i) events and conditions associated with the ownership or operation of the Assets
and occurring before the Closing Date (other than those losses for which the Partnership Entities are entitled to indemnification from the Westlake Contributors under Section 2.1) to the extent that the Westlake Entities are notified in
writing of any of the foregoing within one year after the Closing Date, (ii) all currently pending legal actions or those threatened in writing against the Westlake Parties, (iii) events and conditions associated with the Retained Assets
whether occurring before or after the Closing Date, and (iv) all federal, state and local income tax liabilities attributable to the operation of the Assets prior to the Closing Date, including any such income tax liabilities of the Westlake
Entities that may result from the consummation of the formation transactions for the Partnership Entities. 
 (b) The Partnership Entities
shall indemnify, defend, and hold harmless the Westlake Entities and their Affiliates from and against any losses, damages, liabilities, claims, demands, causes of action, judgments, settlements, fines, penalties and reasonable costs and expenses
(including court costs and reasonable attorney’s and expert’s fees) of any and every kind or character, known or unknown, fixed or contingent, suffered or incurred by the Westlake Entities or their Affiliates by reason of or arising out of
claims asserted by any third party with respect to events and conditions associated with the operation of the Assets and occurring on or after the Closing Date (other than those losses for which the Partnership Entities are entitled to
indemnification from the Westlake Contributors under Section 2.1(a) or Section 2.2(a)). 

  
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 (c) The Westlake Parties shall indemnify, defend, and hold harmless the Partnership Entities from
and against any losses, damages, liabilities, claims, demands, causes of action, judgments, settlements, fines, penalties, and reasonable costs and expenses (including court costs and reasonable attorneys’ and experts’ fees) of any and
every kind or character, known or unknown, fixed or contingent, suffered or incurred by the Partnership Entities by reason of or arising out of any employee benefit plan sponsored or contributed to by the Westlake Parties or their ERISA Affiliates
(other than the Partnership Entities and any other Person that directly or indirectly through one or more intermediaries is controlled by a Partnership Entity), including, but not limited to, any liability of the Westlake Parties and such ERISA
Affiliates under Title IV of ERISA and any claims by current or former employees of such entities for post-retirement medical benefits, but excluding any such loss, damage, liability, claim, demand, cause of action, judgment, settlement, fine,
penalty or cost and expense that is reimbursable by a Partnership Entity to the Westlake Parties under the Services Agreement. Notwithstanding the foregoing, the indemnity provided in the preceding sentence shall cease to apply with respect to a
Partnership Entity on the date such Partnership Entity ceases to be an ERISA Affiliate except with respect to any matter covered by such indemnity that arose prior to such date. 

(d) The Partnership Entities shall indemnify, reimburse, defend and hold harmless the Westlake Parties and their Affiliates and their
respective successors and permitted assigns, together with their respective employees, officers, members, managers, directors, agents and representatives, from and against all losses, costs, damages, injuries, taxes, penalties, interests, expenses,
obligations, claims and liabilities (joint or severable) of any kind or nature whatsoever (collectively “Losses”) that are incurred by such Indemnified Parties in connection with, relating to or arising out of (i) the breach by
such Partnership Entity of any term or condition of this Agreement, or (ii) the performance of any Services hereunder; provided, however, that the Partnership Entities shall not be obligated to indemnify, reimburse, defend or hold harmless any
Indemnified Party for any Losses incurred, by such Indemnified Party in connection with, relating to or arising out of (i) a breach by such Indemnified Party of this Agreement, (ii) the gross negligence, willful misconduct, bad faith or
reckless disregard of such Indemnified Party with respect to the Services hereunder or (iii) fraudulent or dishonest acts of such Indemnified Party. 

(e) The Westlake Parties shall indemnify, reimburse, defend and hold harmless the Partnership Entities and their Affiliates and their
respective successors and permitted assigns, together with their respective employees, officers, members, managers, directors, agents and representatives, from and against all losses, costs, damages, injuries, taxes, penalties, interests, expenses,
obligations, claims and liabilities (joint or severable) of any kind or nature whatsoever (collectively “Losses”) that are incurred by such Indemnified Parties in connection with, relating to or arising out of (i) the breach by
such Westlake Party of any term or condition of this Agreement, or (ii) the performance of any Services hereunder; provided, however, that the Westlake Parties shall not be obligated to indemnify, reimburse, defend or hold harmless any
Indemnified Party for any Losses incurred, by such Indemnified Party in connection with, relating to or arising out of (i) a breach by such Indemnified Party of this Agreement, (ii) the gross negligence, willful misconduct, bad faith or
reckless disregard of such Indemnified Party with respect to the Services hereunder or (iii) fraudulent or dishonest acts of such Indemnified Party. 

  
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 Section 2.3 Consequential Damages. NOTWITHSTANDING ANY PROVISION OF THIS
AGREEMENT, IN NO EVENT SHALL ANY PARTY BE LIABLE TO ANY OTHER PARTY OR INDEMNIFIED PARTY WITH RESPECT TO ANY CLAIM ARISING OUT OF OR RELATING TO THIS AGREEMENT FOR ANY LOST OR PROSPECTIVE PROFITS OR ANY OTHER SPECIAL, CONSEQUENTIAL,
INCIDENTAL, OR INDIRECT LOSSES OR DAMAGES FROM ITS PERFORMANCE UNDER THIS AGREEMENT OR FOR ANY FAILURE OR PERFORMANCE HEREUNDER OR RELATED HERETO, WHETHER ARISING OUT OF BREACH OF CONTRACT, NEGLIGENCE, TORT, STRICT LIABILITY, OR OTHERWISE,
EXCEPT FOR ANY SUCH DAMAGES RECOVERED BY ANY THIRD PARTY AGAINST ANY PARTY IN RESPECT OF WHICH SUCH PARTY WOULD OTHERWISE BE ENTITLED TO INDEMNIFICATION PURSUANT TO THIS ARTICLE II, PROVIDED THAT NO PARTY SHALL BE ENTITLED TO INDEMNIFICATION FOR ANY
DAMAGES THAT ARE CONTRARY TO APPLICABLE LAW. 
 Section 2.4 Indemnification Procedures. 

(a) The Indemnified Party agrees that promptly after it becomes aware of facts giving rise to a claim for indemnification under this
Article II, it will provide notice thereof in writing to the Indemnifying Party, specifying the nature of and specific basis for such claim. The Indemnified Party shall also provide supporting information indicating the facts and
circumstances relating to the claim, copies of all correspondence with third parties, Governmental Authorities or other individuals relating to the claim, and other relevant information reasonably requested by the Indemnifying Party. 

(b) The Indemnifying Party shall have the right to control all aspects of the response to or defense of (and any counterclaims with respect
to) any claims brought against the Indemnified Party that are covered by the indemnification under this Article II, including correspondence and negotiation with Governmental Authorities, the selection of counsel and other consultants,
determination of the scope of and approach to any investigation or remediation, determination of whether to appeal any decision of any court, determination of whether to enter into any voluntary agreement with any Governmental Authority, 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 of the Indemnified Party (with the concurrence of the Conflicts Committee in the case of the Partnership
Entities) 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 under this Article II, including the prompt furnishing to the Indemnifying Party of any
correspondence or other notice relating thereto that the Indemnified Party may receive, permitting the name 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 

  
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Indemnified Party pursuant to this Section 2.4. 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 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) In determining the amount of
any loss, cost, damage or expense for which the Indemnified Party is entitled to indemnification under this Agreement, the gross amount of the indemnification will be reduced by (i) any insurance proceeds realized by the Indemnified Party, and
such correlative insurance benefit shall be net of any incremental insurance premiums that become due and payable by the Indemnified Party as a result of such claim and (ii) all amounts recovered by the Indemnified Party under contractual
indemnities from third Persons. 
 ARTICLE III 

SERVICES 

Section 3.1 Scope of Services. The Westlake Parties agree to provide, and agree to cause their respective Affiliates to
provide, on behalf of the GP for the Partnership Entities’ benefit, the selling, general and administrative services necessary to run the business of the Partnership Entities (the “Business”), which services may include,
without limitation, those services set forth in Schedule II to this Agreement (collectively, the “Services”). 

Section 3.2 Exclusion of Services. At any time, either GP or the Westlake Parties may temporarily or permanently exclude
any particular service from the scope of Services upon 180 days’ notice. 
 Section 3.3 Performance of Services by
Affiliates or Other Persons. The Parties hereby agree that in discharging its obligations hereunder, the Westlake Parties may engage any of their Affiliates or other Persons to perform the Services (or any part of the Services) on their behalf
and that the performance of the Services (or any part of the Services) by any such Affiliate or Person shall be treated as if the Westlake Parties performed such Services. No such delegation by the Westlake Parties to Affiliates or other Persons
shall relieve the Westlake Parties of their obligations hereunder. 
 Section 3.4 Payment Amount. GP shall pay, or cause
to be paid, to the Westlake Parties the amount of any direct or indirect expenses incurred by the Westlake Parties or their Affiliates in connection with the provision of Services by the Westlake Parties or their Affiliates (the “Payment
Amount”), in accordance with the following: 
 (a) Dedicated Personnel. The Payment Amount will include all Personnel Costs
of Dedicated Personnel as determined by the Westlake Parties on a commercially reasonable basis. 

  
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 (b) Shared Personnel and Administrative Personnel. The Payment Amount will include a pro
rata share of all Personnel Costs of Shared Personnel and Administrative Personnel, as determined by the Westlake Parties on a commercially reasonable basis. 

(c) Administrative Costs. The Payment Amount will include following: 

(i) Office Costs. A pro rata share of all office costs (including, without limitation, all costs relating to office
leases, equipment leases, supplies, property taxes and utilities) for all locations of Administrative Personnel, as determined by the Westlake Parties on a commercially reasonable basis, based on the allocation methodology determined by the Westlake
Parties, as reasonably acceptable to the Partnership Group and in accordance with United States generally accepted accounting principles; 

(ii) Insurance. Insurance premiums will be direct charged to the applicable insured to the extent possible, and
otherwise will be allocated on a commercially reasonable basis determined by the Westlake Parties, based on the allocation methodology determined by the Westlake Parties, as reasonably acceptable to the Partnership Group and in accordance with
United States generally accepted accounting principles; 
 (iii) Outside Services. Services provided by outside
vendors (including audit services, legal services and other services) will first be direct charged where applicable; provided, however that the Payment Amount will include a pro rata share of charges for all services that are provided by outside
vendors and not direct charged, as determined by the Westlake Parties on a commercially reasonable basis, based on the allocation methodology determined by the Westlake Parties, as reasonably acceptable to the Partnership Group and in accordance
with United States generally accepted accounting principles; 
 (iv) Other SGA Costs. A pro rata share of all other
sales, general and administrative costs relating to the Partnership Entities, as determined by the Westlake Parties on a commercially reasonable basis, based on the allocation methodology determined by the Westlake Parties, as reasonably acceptable
to the Partnership Group and in accordance with United States generally accepted accounting principles; and 
 (v)
Depreciation and Amortization. A pro rata share of depreciation and amortization relating to all locations of Administrative Personnel, as determined by the Westlake Parties on a commercially reasonable basis, following recognition of such
depreciation or amortization as an expense on the books and records of the Westlake Parties or their Affiliates. 
 (d) Other Costs.
Bank charges, interest expense and any other costs as reasonably incurred by the Westlake Parties or their Affiliates in the provision of Services will be direct charged to the Partnership Entities. For the avoidance of doubt, any of the foregoing
costs and expenses described in Section 3.4 that are direct charged to any Party will not be included in the Payment Amount. 

  
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 Section 3.5 Payment of the Payment Amount. The Westlake Parties shall submit
monthly invoices to GP for the Services on or before the 20th day of each month, which invoices shall be due and payable not later than the 5th
day following receipt of such invoice. If the due date for payment is not a Business Day, then the due date for payment shall be the immediately succeeding Business Day. GP shall pay, or cause the Partnership Group to pay, to the Westlake Parties in
immediately available funds, the full Payment Amount due under Section 3.4. Past due amounts shall bear interest at the Default Rate. If GP fails to make payment of any amount of any monthly invoice, other than any amount thereof that is
disputed in accordance with Section 3.6 below, on or before the later of (a) the 60th Day after such payment is due and (b) the 30th Day after notice by the Westlake Parties of such non-payment, the Westlake Parties shall have the
right to suspend the provision of the Services hereunder until such payment is made. 
 Section 3.6 Disputed Charges. GP
MAY, WITHIN 90 DAYS AFTER RECEIPT OF A CHARGE FROM THE WESTLAKE PARTIES, TAKE WRITTEN EXCEPTION TO SUCH CHARGE, ON THE GROUND THAT THE SAME WAS NOT A REASONABLE COST INCURRED BY THE WESTLAKE PARTIES OR THEIR AFFILIATES IN CONNECTION WITH THE
SERVICES. GP SHALL NEVERTHELESS PAY OR CAUSE THE PARTNERSHIP ENTITIES TO PAY IN FULL WHEN DUE THE FULL PAYMENT AMOUNT OWED TO THE WESTLAKE PARTIES. SUCH PAYMENT SHALL NOT BE DEEMED A WAIVER OF THE RIGHT OF A PARTNERSHIP ENTITY TO RECOUP ANY
CONTESTED PORTION OF ANY AMOUNT SO PAID. HOWEVER, IF THE AMOUNT AS TO WHICH SUCH WRITTEN EXCEPTION IS TAKEN, OR ANY PART THEREOF, IS ULTIMATELY DETERMINED NOT TO BE A REASONABLE COST INCURRED BY THE WESTLAKE PARTIES OR THEIR AFFILIATES IN CONNECTION
WITH THEIR PROVISION OF THE SERVICES HEREUNDER, SUCH AMOUNT OR PORTION THEREOF (AS THE CASE MAY BE) SHALL BE REFUNDED BY THE WESTLAKE PARTIES TO THE PARTNERSHIP ENTITIES TOGETHER WITH INTEREST THEREON AT THE DEFAULT RATE FOR THE PERIOD FROM THE DATE
OF PAYMENT BY THE PARTNERSHIP ENTITIES TO THE DATE OF REFUND BY THE WESTLAKE PARTIES. 
 Section 3.7 Employees. The
Partnership Entities shall not be obligated to pay directly to Dedicated Personnel or Shared Personnel any compensation, salaries, wages, bonuses, benefits, social security taxes, workers’ compensation insurance, retirement and insurance
benefits, training or other expenses. 
 Section 3.8 Limitation of Duties and Liability. The relationship of the Westlake
Parties to the Partnership Entities pursuant to this Article III is as an independent contractor and nothing in this Agreement shall be construed to impose on the Westlake Parties, or on any of their Affiliates, or on any of their
respective successors and permitted assigns, or on their respective employees, officers, members, managers, directors, agents and representatives, any express or implied fiduciary duty. The Westlake Parties and their Affiliates and their respective
successors and permitted assigns, together with their respective employees, officers, members, managers, directors, agents and representatives, shall not be liable for, and the Partnership Entities shall not take, or permit to be taken, any action
against any of such Persons to hold such Persons liable for (a) any error of judgment or mistake of law by such Persons or for any Loss suffered by such Persons in connection with the performance of any Services under this Agreement, except for
a liability or loss resulting from gross negligence, willful misconduct, bad 

  
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faith or reckless disregard in the performance by such Persons of the Services, or (b) any fraudulent or dishonest acts by the Partnership Entities. In no event, whether based on contract,
indemnity, warranty, tort (including negligence), strict liability or otherwise, shall the Westlake Parties or their Affiliates, their respective successors and permitted assigns, or their respective employees, officers, members, managers,
directors, agents and representatives, be liable for loss of profits or revenue or special, incidental, exemplary, punitive or consequential damages. 

ARTICLE IV 
 RIGHT
OF FIRST REFUSAL 
 Section 4.1 Westlake Right of First Refusal. 

(a) The Partnership Entities hereby grant to Westlake a right of first refusal on any proposed Transfer (other than a grant of a security
interest to a bona fide third-party Lender or a Transfer to another Partnership Entity; provided that such Partnership Entity shall remain bound by this Section 4.1) of (i) equity interests in OpCo or (ii) both the Assets that
serve the Westlake Entities’ other facilities and any other assets that the Partnership Group may acquire from the Westlake Entities, excluding sales or other dispositions of inventory, accounts receivable, spare parts and other assets in the
ordinary course of business, and sales or other dispositions of assets as part of normal retirements or replacements. The Parties acknowledge and agree that nothing in this Section 4.1 shall prevent or restrict the Transfer of the
capital stock of, equity ownership interests or other securities in the GP or the MLP. 
 (b) The Parties acknowledge that all potential
Transfers of Assets pursuant to this Section 4.1 are subject to obtaining any and all required written consents of Governmental Authorities. 

(c) Westlake shall have the right, in its sole discretion, to assign its rights under this Section 4.1 to any Affiliate of
Westlake. 
 Section 4.2 Procedures. 

(a) If a Partnership Entity proposes to Transfer either the equity interests in OpCo or any of the Assets with respect to which a right of
first refusal has been granted pursuant to this Article IV to any Person pursuant to a bona fide third-party offer (an “Acquisition Proposal”), then the Partnership Entity bound by such right of first refusal
(“Seller”) shall promptly give written notice (a “Disposition Notice”) thereof to Westlake. The Disposition Notice shall set forth the following information in respect of the proposed Transfer: the name and address
of the prospective acquiror (the “Proposed Transferee”), the assets subject to the Acquisition Proposal (the “Sale Assets”), the purchase price offered by such Proposed Transferee (the “Offer
Price”), reasonable detail concerning any non-cash portion of the proposed consideration, if any, to allow Westlake to reasonably determine the fair market value of such non-cash consideration, Seller’s estimate of the fair market
value of any non-cash consideration and all other material terms and conditions of the Acquisition Proposal that are then known to Seller. To the extent the Proposed Transferee’s offer consists of consideration other than cash (or in addition
to cash) the Offer Price shall be deemed equal to the amount of any such cash plus the fair market value of such non-cash consideration. In the event Seller and 

  
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Westlake agree as to the fair market value of any non-cash consideration, Westlake will provide written notice of its decision regarding the exercise of its right of first refusal to purchase the
Sale Assets within 30 days of its receipt of the Disposition Notice (the “First ROFR Acceptance Deadline”). Failure to provide such notice within such 30-day period shall be deemed to constitute a decision not to purchase the Sale
Assets. In the event (i) Westlake’s determination of the fair market value of any non-cash consideration described in the Disposition Notice (to be determined by Westlake within 30 days of receipt of such Disposition Notice) is less than
the fair market value of such consideration as determined by Seller in the Disposition Notice and (ii) Westlake and Seller are unable to mutually agree upon the fair market value of such non-cash consideration within 30 days after Westlake
notifies Seller of its determination thereof, Seller and Westlake shall engage a mutually agreed upon valuation firm to determine the fair market value of the non-cash consideration. Such valuation firm shall be instructed to notify Westlake and
Seller of its decision within 30 days after all material information is submitted thereto, which decision shall be final. The fees of the valuation firm will be split equally between Seller and Westlake. Westlake will provide written notice of its
decision regarding the exercise of its right of first refusal to purchase the Sale Assets to Seller within 30 days after the valuation firm has submitted its determination (the “Second ROFR Acceptance Deadline”). Failure to provide
such notice within such 30-day period shall be deemed to constitute a decision by Westlake not to purchase the Sale Assets. If Westlake fails to exercise a right during any applicable period set forth in this Section 4.2(a), Westlake
shall be deemed to have waived its rights with respect to such proposed disposition of the Sale Assets, but not with respect to any future offer of assets. 

(b) If Westlake chooses to exercise its right of first refusal to purchase the Sale Assets under Section 4.2(a), Westlake and
Seller shall enter into a purchase and sale agreement for the Sale Assets, which shall include the following terms: 
 (i)
Westlake will agree to deliver cash for the Offer Price (unless Westlake and Seller agree that consideration will be paid by means of non-cash consideration); 

(ii) Seller will represent that it has good and indefeasible title to the Sale Assets, subject to all recorded matters and all
physical conditions in existence on the closing date for the purchase of the Sale Assets, plus any other such matters as Westlake may approve, which approval will not be unreasonably withheld. If Westlake desires to obtain any title insurance with
respect to the Sale Assets, the full cost and expense of obtaining the same (including the cost of title examination, document duplication and policy premium) shall be borne by Westlake; 

(iii) Seller will grant to Westlake the right, exercisable at Westlake’s risk and expense, to make such surveys, tests
and inspections of the Sale Assets as Westlake may deem desirable, so long as such surveys, tests or inspections do not damage the Sale Assets or interfere with the activities of Seller and its Affiliates thereon and so long as Westlake has
furnished Seller with evidence that adequate liability insurance is in full force and effect; 

  
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 (iv) Westlake will have the right to terminate its obligation to purchase the
Sale Assets under this Article IV if the results of any searches, surveys, tests or inspections conducted pursuant to Section 4.2(b)(ii) or (iii) above are, in the reasonable opinion of Westlake, unsatisfactory;

 (v) the closing date for the purchase of the Sale Assets shall occur no later than 120 days following receipt by Seller
of written notice by Westlake of its intention to exercise its option to purchase the Sale Assets pursuant to Section 4.2(a); 

(vi) Seller shall execute, have acknowledged and deliver to Westlake a special warranty deed, assignment of easement, or
comparable document, as appropriate, in the applicable jurisdiction, on the closing date for the purchase of the Sale Assets constituting real property interests, conveying the Sale Assets to Westlake free and clear of all encumbrances created by
Seller and its Affiliates other than those set forth in Section 4.2(b)(ii) above; 
 (vii) the sale of any Sale
Assets shall be made on substantially the same terms and conditions as the Acquisition Proposal, unless otherwise agreed by Seller and Westlake or otherwise provided herein; and 

(viii) neither Seller nor Westlake shall have any obligation to sell or buy the Sale Assets if any of the material consents
referred to in Section 4.1(c) have not been obtained. 
 (c) Seller and Westlake shall cooperate in good faith in obtaining all
necessary governmental and other third Person approvals, waivers and consents required for the closing. Any such closing shall be delayed, to the extent required, until the third Business Day following the expiration of any required waiting periods
under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended. 
 (d) If the Transfer to the Proposed Transferee is not
consummated in accordance with the terms of the Acquisition Proposal within the later of (A) 180 days after the later of the applicable ROFR Acceptance Deadline, and (B) 10 days after the satisfaction of all governmental approval or filing
requirements, if any, the Acquisition Proposal shall be deemed to lapse, and Seller may not Transfer any of the Sale Assets described in the Disposition Notice without complying again with the provisions of this Article IV. 

ARTICLE V 

REPRESENTATIONS AND WARRANTIES 

Section 5.1 Representations by the Westlake Parties. Each of the Westlake Parties represents and warrants to the
Partnership Entities that: 
 (a) Such Westlake Party is duly organized, validly existing and in good standing under the laws of the State
of Delaware, and has all requisite power and authority to own and lease the properties and assets it currently owns and leases, including the Retained Assets, and to conduct its activities as such activities are currently conducted and as
contemplated by this Agreement. 

  
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 (b) Such Westlake Party has all requisite power, authority and capacity to execute, deliver and
perform this Agreement and to consummate the transactions contemplated hereby. The execution, delivery and performance of this Agreement and the consummation of the transactions contemplated hereby by such Westlake Party have been duly and validly
authorized by all necessary action on the part of such Westlake Party, and this Agreement has been duly and validly executed and delivered by such Westlake Party, and is the valid and binding obligation of such Westlake Party, enforceable against
such Westlake Party in accordance with its terms, subject to applicable laws of bankruptcy, insolvency and similar laws affecting creditors’ rights and remedies generally. 

(c) The execution, delivery and performance by such Westlake Party of this Agreement does not and will not (i) conflict with or violate
any provision of such Westlake Party’s organizational documents; (ii) violate any provision of any Applicable Laws; (iii) conflict with, violate, result in a breach of, constitute a default under (without regard to requirements of
notice, lapse of time, or elections of other Persons, or any combination thereof) or accelerate or permit the acceleration of the performance required by, any contracts or other instruments to which such Westlake Party is a party or by which either
such Westlake Party or the Retained Assets is bound or affected which would cause a material adverse impact on the Partnership Entities; or (iv) require any consent, approval, or authorization of, or filing of any certificate, notice,
application, report, or other document with, any Governmental Authority or other Person that has not been obtained or the failure to obtain which would cause a material adverse impact on the Partnership Entities. 

Section 5.2 Representations by Partnership Entities. Each of the Partnership Entities represents and warrants to the
Westlake Parties that: 
 (a) Such Partnership Entity is duly organized, validly existing and in good standing under the laws of the state
of its organization, and, as of the Closing Date, has all requisite power and authority to own and lease the properties and assets it currently owns and leases, including the Assets, and to conduct its activities as such activities are currently
conducted and as contemplated by this Agreement. 
 (b) Such Partnership Entity has all requisite power, authority and capacity to execute,
deliver and perform this Agreement and to consummate the transactions contemplated hereby. The execution, delivery and performance of this Agreement and the consummation of the transactions contemplated hereby by such Partnership Entity have been
duly and validly authorized by all necessary action on the part of such Partnership Entity, and this Agreement has been duly and validly executed and delivered by such Partnership Entity, and is the valid and binding obligation of such Partnership
Entity, enforceable against such Partnership Entity in accordance with its terms, subject to applicable laws of bankruptcy, insolvency and similar laws affecting creditors’ rights and remedies generally. 

(c) The execution, delivery and performance by such Partnership Entity of this Agreement do not and will not (i) conflict with or violate
any provision of such Partnership Entity’s organizational documents; (ii) violate any provision of any Applicable Laws; (iii) conflict with, violate, result in a breach of, constitute a default under (without regard to requirements of
notice, lapse of time, or elections of other Persons, or any combination thereof) 

  
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or accelerate or permit the acceleration of the performance required by, any contracts or other instruments to which such Partnership Entity is a party or by which either such Partnership Entity
or its Assets are bound or affected, which would cause a material adverse impact on the Westlake Entities; or (iv) require any consent, approval, or authorization of, or filing of any certificate, notice, application, report, or other document
with, any Governmental Authority or other Person that has not been obtained or the failure to obtain which would cause a material adverse impact on the Westlake Entities. 

ARTICLE VI 

INSURANCE 

Section 6.1 Westlake Insurance. 

(a) Subject to the GP’s reasonable approval and the last sentence of this Section 6.1(a), the Westlake Entities shall obtain
and maintain the insurance described in Section 6.1(b) during any period in which one or more of the Related Agreements is in effect. The Westlake Entities shall procure and maintain such insurance under individual or blanket policies
and include the Partnership Entities as additional insureds under all liability policies except for workers compensation insurance. If at any time the insurer (or prospective insurer) under the property insurance referenced in
Section 6.1(b)(vi) will not permit the Partnership Entities to remain named insureds under such policy, then the Westlake Entities shall notify the MLP thereof as soon as reasonably practicable (but in any event no later than 30 days
prior to the date that the Partnership Entities cease to be named insureds) and the MLP shall be responsible for obtaining and maintaining the property insurance described in such Section 6.1(b)(vi) covering the Partnership
Entities’ real and personal property and time element loss caused by direct damage to covered property. 
 (b) The minimum insurance to
be obtained and maintained by the Westlake Entities is set forth below: 
 (i) Statutory Workers Compensation Insurance in
compliance with Applicable Law covering all employees at the Westlake Complexes; 
 (ii) Employer’s Liability
Insurance, in a minimum amount per accident determined by the Westlake Parties on a commercially reasonable basis; 
 (iii)
Commercial General Liability Insurance, covering bodily injury and property damage to third parties and covering liability for damage to property of third parties. Such policy or combination of policies shall provide per occurrence and annual
aggregate limits determined by the Westlake Parties on a commercially reasonable basis and shall include contractual liability coverage. Policy form may be either occurrence or claims-made; 

(iv) Automobile Liability Insurance with limits per accident determined by the Westlake Parties on a commercially reasonable
basis and covering any auto; 

  
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 (v) Excess/Umbrella Liability Insurance written on an occurrence or integrated
occurrences basis and providing coverage limits in excess of the primary limits of the insurance described in clauses (ii), (iii) and (iv) above; the limits of such excess/umbrella coverage shall be determined by the Westlake Parties on a
commercially reasonable basis; 
 (vi) Property Insurance, on an “All Risks” of physical loss or damage to all of
the Partnership Entities’ and the Westlake Entities’ real and personal property (including the Assets and the Westlake Complexes) and time element loss in which the MLP and the Westlake Entities have an insurable interest; such coverage
shall name the Partnership Entities as named insureds and meet the requirements of any Lender; and 
 (vii) Environmental
Insurance having limits of liability of an amount per pollution condition and an aggregate amount for all pollution conditions, each as determined by Westlake on a commercially reasonable basis, which provide reasonably obtainable coverage for
bodily injury, property damage, or remediation costs to the Partnership Entities’ and the Westlake Entities’ property or to third parties, relating to pollution conditions, including Releases, Hazardous Substances or Remediations; such
coverage shall name the Partnership Entities as named insureds. 
 Except for workers’ compensation insurance and that insurance described above as to
which the Partnership Entities are required to be named as named insureds, the insurance described in this Section 6.1(b) shall include the Partnership Entities as additional insureds as to the operations and activities of the Assets and
the Westlake Complexes. It is further agreed that such insurance shall be primary with regard to the aforementioned additional insured status. 

(c) All policies, binders or interim insurance contracts with respect to insurance maintained by the Westlake Entities pursuant to
Section 6.1(b) and with respect to insurance maintained by the MLP pursuant to Section 6.2 shall: 

(i) be placed with reputable, creditworthy insurance companies of nationally recognized standing and reasonably acceptable to
the MLP, the Westlake Entities and (if applicable) Lenders and that are licensed or authorized to do business in the State of Texas; 

(ii) state that it is primary, or is excess only with respect to the specific primary policy provided by the same Party for
such coverage, and not excess or contributing as with respect to any other insurance (or self-insurance) available to any other Person or Lender insured thereunder and that all provisions thereof, except the limits of liability, shall operate in the
same manner as if there were a separate policy covering each insured under each such policy; 
 (iii) provide that there
will be no recourse against any additional insured for the payment of premiums or commissions (if such policies provide for the payment thereof) or additional premiums or assessments, it being understood that such are obligations of the named
insured providing such insurance pursuant to this Agreement; 

  
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 (iv) waive any right of subrogation of the insurers thereunder against the MLP,
Lender and the members, partners, officers and directors and employees of each of them with respect to insurance described in Section 6.1(b), waive any right of subrogation of the insurers thereunder against the Westlake Entities and
their Affiliates and the members, partners, officers, directors and employees of each of them with respect to insurance described in Section 6.2, and waive any right of the insurers to any set-off or counterclaim or any other deduction,
whether by attachment or otherwise, with respect to any liability of any such Person insured under such policy; 
 (v) with
respect to the interests of the additional named insureds, provide that such insurance shall not be invalidated by any action or inaction of the additional named insureds and shall insure the additional named insureds regardless of any breach or
violation of any warranty, declaration or condition contained in such insurance by the primary named insured; and 
 (vi)
provide that it may not be canceled or materially changed without giving the MLP 30 days prior written notification thereof with respect to insurance described in Section 6.1(b), and without giving the Westlake Entities 30 days prior
written notification thereof with respect to insurance described in Section 6.2. 
 (d) Reference is made to the fact that the
Westlake Entities periodically review the availability, terms and cost of property and liability insurance coverages with respect to the Westlake Complexes and other properties and operations of the Westlake Entities and their Affiliates. During the
term of this Agreement, the Westlake Entities agree to conduct such review no less frequently than once each fiscal year. On or about the completion of each such review, the Westlake Entities will notify the MLP of the results of such review. The
Westlake Entities and the MLP shall thereafter reasonably cooperate in determining the limits, deductibles, self-insured retention amounts and other material terms that will apply to the renewal or replacement insurance coverages to be acquired by
the Westlake Entities and as to which the MLP will be a named insured or additional insured consistent with the provisions of this Section 6.1; and in each case the determination to be made in accordance with the preceding provisions of
this sentence shall take into account the terms and cost of the available insurance coverages. Notwithstanding anything to the contrary, until such time as the MLP is responsible for acquiring a particular insurance coverage pursuant to the last
sentence of Section 6.1(a), the Westlake Entities shall have the right to acquire such insurance coverage even if the Westlake Entities and the MLP have failed to reach a mutual determination on the limits, deductibles or other terms of
such coverage. 
 Section 6.2(a) MLP Insurance. MLP shall obtain and maintain (or cause to be obtained and maintained) at
its expense the minimum insurance described below under individual or blanket policies: 
 (i) In the event any of the
Partnership Entities has any employees, such Partnership Entity will obtain and maintain at all times statutory Workers’ Compensation Insurance in compliance with Applicable Law; and 

  
 21 

 (ii) During any period when the last sentence of Section 6.1(a) is
applicable, the property insurance referenced in such sentence. 
 (b) Reference is made to the fact that the MLP will periodically review
the availability, terms and cost of property and liability insurance coverages with respect to the Assets. During the term of this Agreement, the MLP agrees to conduct such review no less frequently than once each fiscal year of the MLP. On or about
the completion of each such review, the MLP will notify the Westlake Entities of the results of such review. The Westlake Entities and the MLP shall thereafter reasonably cooperate in determining the limits, deductibles, self-insured retention
amounts and other material terms that will apply to the renewal or replacement insurance coverages to be acquired by the MLP consistent with the provisions of this Section 6.2; and in each case the determination to be made in accordance
with the preceding provisions of this sentence shall take into account the terms and cost of the available insurance coverages. Notwithstanding anything to the contrary, the MLP shall have the right to acquire such insurance coverage even if the MLP
and the Westlake Entities have failed to reach a mutual determination on the limits, deductibles or other terms of such coverage. 

Section 6.3 Certificates; Proof of Loss. On or before the required date for the insurance to be provided hereunder, each
Party shall furnish certificates of insurance to the other Party evidencing the insurance required of such Party pursuant to this Agreement. The Party maintaining each insurance hereunder shall make all proofs of loss under each such policy and
shall take all other action reasonably required to ensure collection from insurers for any loss under any such policy, except that the MLP may require the Westlake Entities to provide such proof of loss and take such other action on behalf of the
MLP in the case of the insurance maintained by the MLP pursuant to Section 6.2. 
 Section 6.4 Payment of
Deductible Amounts. Notwithstanding which Party shall have obtained, or have been responsible for obtaining, insurance under Section 6.1 or 6.2(i), the Person making the claim under any liability insurance shall bear any
deductible or self-insured retention amount applicable to such claim; provided that if any other Person insured under such liability insurance is also liable with respect to the occurrence giving rise to such claim, then the Person making the claim
and such other Persons shall each bear its pro rata share of such deductible or self-insured retention amount based on the allocation of liability among them; and (b) the Person making the claim under any property insurance shall bear any
deductible or self-insured retention amount applicable to such claim; provided, if the occurrence giving rise to such claim also results in damage to or loss of property owned by any other Person insured under such property insurance, then the
Person making the claim and such other Persons shall bear its pro rata share of such deductible or self-insured retention amount based on the damage and loss suffered by such Person as compared to the aggregate damage and loss suffered by all such
Persons. 
 Section 6.5 Contractor’s Insurance. MLP and the Westlake Entities shall require their respective
contractors and their subcontractors performing any services or conducting any operations or taking any on site activities with respect to the Assets or Retained Assets to procure and maintain, at a minimum, the following insurance and all policies
shall include the Partnership Entities, the applicable Westlake Entity and (as applicable) Lender as additional insureds (except for workers compensation) and shall include waivers of subrogation in favor of the Partnership Entities, the applicable
Westlake Entity and Lender. Such insurance will be primary and non-contributory of any insurance carried by or maintained on behalf of the Partnership Entities, the applicable Westlake Entity or Lender. 

  
 22 

 Any contractor of the MLP or a Westlake Entity shall carry, and shall either cause its
subcontractors to carry or to provide access to, insurance for Workers’ Compensation, Employer’s Liability, project specific Commercial General Liability (including Products & Completed Operations and Sudden & Accidental
Pollution), Watercraft and Aircraft Liability (if same are used in providing services) and Automobile Liability insurance (including “any auto”), each with minimum limits determined on a commercially reasonable basis (which can be
accomplished in conjunction with an umbrella insurance policy); provided that minimum amounts of Workers’ Compensation shall be set forth in Applicable Law. 

Any contractor of the MLP or a Westlake Entity shall also carry or provide access to Pollution Liability insurance as required by
environmental laws and/or regulations. Additionally, such contractors shall provide All Risks Property insurance with limits equal to the full value of the services and associated equipment during fabrication/construction and final delivery to the
MLP or the applicable Westlake Entity. Such contractors shall supply the MLP and the applicable Westlake Entity with certificates or policies of such insurance prior to entry upon premises of the MLP and the applicable Westlake Entity. MLP and the
applicable Westlake Entity shall be named as an additional insured, except for Workers’ Compensation and Employer’s Liability, and subrogation shall be waived on all insurance. All insurance of any contractor and their subcontractors shall
be primary. 
 Any contractor of the MLP or a Westlake Entity shall waive subrogation with respect to all deductibles and no self-insured
retention shall exceed the amount determined by the Westlake Parties on a commercially reasonable basis without written approval of the MLP and the Westlake Entities. Such contractors shall cause their and their subcontractors’ insurers to
provide the MLP and the Westlake Entities with thirty (30) days’ written notice of cancellation or material change. In the event any contractor or any of its subcontractors fail to procure or maintain in force the insurance specified
herein the MLP and the Westlake Entities may secure such insurance and the cost thereof shall be borne by such contractor. The insurance required under the Standard Terms and Conditions shall not be a limitation on any contractor’s liability
under this Agreement, nor shall it be limited by any other section of this Agreement. 
 Any contractor of the MLP or a Westlake Entity
shall carry project specific Professional Liability insurance covering claims to the extent resulting from their negligent performance of services. Minimum limits shall be set on a commercially reasonable basis. Claims-made coverage is
acceptable provided the policy retroactive date is maintained prior to the date services are rendered to the MLP and the applicable Westlake Entity and continuing for a period of time equal to two (2) years from the actual completion of such
contractor’s services. 

  
 23 

 ARTICLE VII 

CONFIDENTIAL INFORMATION 

Section 7.1 Information. Each of the Partnership Entities and the Westlake Parties (the “Recipient”)
agrees that it will utilize any Confidential Information received from the other solely in connection with the performance of its obligations hereunder and the exercise by the Recipient of its rights and remedies hereunder and under Applicable Law,
and all such Confidential Information will be subject to and bound by the provisions set forth in this Article VII. Upon termination of this Agreement and the Related Agreements, the Recipient shall return or destroy all such
Confidential Information (and cease all further use and disclosure of such Confidential Information) that has been provided to it, together with all reproductions thereof in the Recipient’s possession; provided that the Recipient shall have the
right to retain copies of any such information and records that relate to its performance of any services and the exercise of its rights and remedies hereunder or under the Related Agreements and under Applicable Law, and all such copies and the
information reflected thereon shall be subject to the first sentence of this Section 7.1 and to Section 7.2. 

Section 7.2 Definition. “Confidential Information” means any information (regardless of format or medium
of exchange) that is disclosed by any disclosing Party or any Affiliate, employee or agent thereof to the Recipient or any Affiliate, employee or agent of the Recipient in connection with the performance of this Agreement or the Related Agreements
or that any disclosing Party has reason to expect will be maintained confidentially provided that Confidential Information shall not include any information that is publicly known. It is further understood that each Party may have the opportunity as
a result of proximity or close operational ties to observe or obtain Confidential Information of any other Party and agrees not to divulge or use such information other than as set forth in this Article VII. 

Section 7.3 Legal Requirement. If the Recipient is legally required (by interrogatories, discovery requests for information
or documents, subpoena, civil or criminal investigative demand or similar process) to disclose any Confidential Information, it is agreed that the Recipient prior to disclosure will use commercially reasonable efforts to provide the disclosing Party
with prompt notice of such request(s) so that the disclosing Party may seek an appropriate protective order or other appropriate remedy or waive the Recipient’s compliance with this Article VII. If such protective order or other
remedy is not obtained, or the disclosing Party grants a waiver hereunder, the Recipient required to furnish Confidential Information may furnish that portion (and only that portion) of the Confidential Information which, in the opinion of such
Party’s counsel, the Recipient is legally compelled to disclose, and the Recipient will exercise commercially reasonable efforts to obtain reliable assurance that confidential treatment will be accorded any Confidential Information so
furnished. Disclosure of Confidential Information by the Recipient shall not violate this Article VII to the extent that Recipient (or its ultimate parent) in the exercise of reasonable good faith judgment deems it necessary, pursuant to
law, regulation or stock exchange rule, to disclose such information in or in connection with filings made with the Securities Exchange Commission, any securities exchange upon which debt or equity securities of such Recipient or its parent may be
listed, to any Governmental Authority or in presentations to lenders or ratings agencies. 

  
 24 

 Section 7.4 Survival. The provisions of this Article VII shall
survive the termination of this Agreement for a period of three years following such termination. 
 ARTICLE VIII 

INTELLECTUAL PROPERTY 

Section 8.1 Ownership by the Westlake Entities and License to MLP. Any (i) inventions, whether patentable or not,
developed or invented, or (ii) copyrightable material (and the intangible rights of copyright therein) developed, by the Westlake Entities, their Affiliates or their employees in connection with the performance of the Services shall be the
property of the Westlake Entities; provided, however, that the Westlake Entities hereby grant, and agree to cause their Affiliates to grant, to the MLP an irrevocable, royalty-free, non-exclusive and non-transferable (without the prior written
consent of the applicable Westlake Entity) right and license to use such inventions or material; and further provided, however, that the MLP shall only be granted such a right and license to the extent such grant does not conflict with, or result in
a breach, default, or violation of a right or license to use such inventions or material granted to the applicable Westlake Entity by any Person other than an Affiliate of the applicable Westlake Entity. Notwithstanding the foregoing, the Westlake
Entities will and will cause their Affiliates to, use all commercially reasonable efforts to grant such right and license to the MLP. 

Section 8.2 License to the Westlake Entities and their Affiliates. MLP hereby grants, and will cause its Affiliates to
grant, to the Westlake Entities and their Affiliates an irrevocable, royalty-free, non-exclusive and non-transferable right and license to use, during the term of this Agreement, any intellectual property provided by the MLP or its Affiliates to the
Westlake Entities or their Affiliates, but only to the extent such use is necessary for the performance of the Services. The Westlake Entities agree that the Westlake Entities and their Affiliates will utilize such intellectual property solely in
connection with the performance of the Services. 
 ARTICLE IX 

TERM; MISCELLANEOUS 

Section 9.1 Term. This Agreement shall terminate upon the termination of all of the Related Agreements; provided that any
claims for indemnification made under this Agreement within any required time period under this Agreement prior to termination shall survive termination. 

Section 9.2 Choice of Law; Submission to Jurisdiction. This Agreement shall be subject to and governed by the laws of the
State of Texas, excluding any conflicts-of-law rule or principle that might refer the construction or interpretation of this Agreement to the laws of another state. Each of the Parties hereby agrees: (i) to submit to the exclusive jurisdiction
of any state or federal court sitting in Houston, Texas in any action or proceeding arising out of or relating to this Agreement or the transactions contemplated hereby, (ii) that all claims in respect of any such action or proceeding may be
heard and determined in any such court, (iii) that such Party will not bring any action or proceeding arising out of or relating to this Agreement in any other court, and (iv) that such Party waives any defense of inconvenient forum to the
maintenance of any such action or proceeding, and waives any bond, surety or other security that might be required of any other Party with respect to any such action or proceeding. 

  
 25 

 Section 9.3 Dispute Resolution. 

(a) The dispute resolution provisions set forth in this Section 9.3 shall be the final, binding and exclusive means to resolve all
disputes, controversies or claims (each, a “dispute”) arising under the Agreement, and each Party irrevocably waives any right to any trial by jury with respect to any dispute arising under this Agreement. 

(b) If a dispute arises, the following procedures shall be implemented: 

(i) Any Party may at any time invoke the dispute resolution procedures set forth in this Section 9.3 as to any
dispute by providing written notice of such action to the other Parties. 
 (ii) Notwithstanding the existence of any
dispute or the pendency of any procedures pursuant to this Section 9.3, and subject to Section 9.12, the Parties agree and undertake that all payments not in dispute shall continue to be made and that all obligations not in
dispute shall continue to be performed. 
 (iii) Within 30 days after receipt of notice of a dispute under subsection
(b)(i), representatives of the Parties shall engage in non-binding mediation, and a specific timetable and completion date for its implementation shall also be agreed upon. If the completion date therefor shall occur without the Parties having
resolved the dispute, then the Parties shall proceed under Section 9.3(b)(iv). 
 (iv) If, after satisfying the
requirement above, the dispute is not resolved, the Parties shall resolve the dispute by a binding arbitration, to be held in the State of Texas pursuant to the Federal Arbitration Act and in accordance with the then-prevailing Commercial
Arbitration Rules of the American Arbitration Association (the “AAA”). The AAA shall select one (1) arbitrator. Each Party shall bear its own expenses incurred in connection with arbitration and the fees and expenses
of the arbitrator shall be shared equally by the Parties involved in the dispute and advanced by them from time to time as required. It is the mutual intention and desire of the Parties that the arbitrator be selected as expeditiously as
possible following the submission of the dispute to arbitration. Once the arbitrator is selected and except as may otherwise be agreed in writing by the Parties involved in such dispute or as ordered by the arbitrator upon substantial
justification shown, the hearing for the dispute will be held within sixty (60) days of submission of the dispute to arbitration. The arbitrator shall render his final award within sixty (60) days, subject to extension by the
arbitrator upon substantial justification shown of extraordinary circumstances, following conclusion of the hearing and any required post-hearing briefing or other proceedings ordered by the
arbitrator. Any discovery in connection with arbitration hereunder shall be limited to information directly relevant to the controversy or claim in arbitration. The decision of the arbitrator in any such proceeding will be reasoned, final
and binding and final judgment may be entered upon such an award in any court of competent jurisdiction, but entry of such 

  
 26 

 
judgment will not be required to make such award effective. Any action against any Party ancillary to arbitration (as determined by the arbitrators), including any action for provisional or
conservatory measures or action to enforce an arbitration award or any judgment entered by any court in respect of any thereof may be brought in any federal or state court of competent jurisdiction located within the State of Texas, and the Parties
hereby irrevocably submit to the non-exclusive jurisdiction of any federal or state court located within the State of Texas over any such action. The Parties hereby irrevocably waive, to the fullest
extent permitted by Law, any objection which they may now or hereafter have to the laying of venue of any such action brought in such court or any defense of inconvenient forum for the maintenance of such action. Each of the Parties agrees that
a judgment in any such action may be enforced in other jurisdictions by suit on the judgment or in any other manner provided by law. 

Section 9.4 Notice. All notices or requests or consents provided for by, or permitted to be given pursuant to, this
Agreement must be in writing and must be given by depositing same in the United States mail, addressed to the Person to be notified, postpaid, and registered or certified with return receipt requested or by delivering such notice in person or by
facsimile or e-mail to such Party. Notice given by personal delivery or mail shall be effective upon actual receipt. Notice given by facsimile or e-mail shall be effective upon actual receipt if received during the recipient’s normal business
hours or at the beginning of the recipient’s next Business Day after receipt if not received during the recipient’s normal business hours. All notices to be sent to a Party pursuant to this Agreement shall be sent to or made at the address
set forth below such Party’s signature to this Agreement or at such other address as such Party may stipulate to the other Parties in the manner provided in this Section 9.4. 

If to the Westlake Entities: 

Westlake Chemical Corporation 

Attention: L. Benjamin Ederington 

Vice President, General Counsel and Secretary 

2801 Post Oak Blvd, Suite 600 

Houston, TX 77056 
 Fax:
713-960-8761 
 If to the Partnership Entities: 

Westlake Chemical Partners GP 

Attention: L. Benjamin Ederington 

Vice President, General Counsel and Secretary 

2801 Post Oak Blvd, Suite 600 

Houston, TX 77056 
 Fax:
713-960-8761 
 Section 9.5 Entire Agreement. This Agreement and the Related Agreements (including any exhibits hereto or
thereto) constitute the entire agreement of the Parties relating to the matters contained herein and therein, superseding all prior contracts or agreements, whether oral or written, relating to the matters contained herein and therein. 

  
 27 

 Section 9.6 Amendment or Modification. This Agreement may be amended or
modified from time to time only by the written agreement of all the Parties hereto; provided, that the MLP may not, without the prior approval of the Conflicts Committee, agree to any amendment or modification of this Agreement that, in the
reasonable judgment of the GP, will adversely affect 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. 

Section 9.7 Assignment. No Party to this Agreement may assign or otherwise transfer or delegate any of its rights or
obligations under this Agreement without the prior written consent of the other Parties hereto, and any purported transfer in violation hereof shall be null and void. This Agreement shall be binding upon, and inure the benefit of, permitted
successors and assigns. 
 Section 9.8 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. 

Section 9.9 Severability. If any provision of this Agreement shall be finally determined to be unenforceable, illegal or
unlawful, such provision shall, so long as the economic and legal substance of the transactions contemplated hereby is not affected in any materially adverse manner as to any Party, be deemed severed from this Agreement and the remainder of this
Agreement shall remain in full force and effect. 
 Section 9.10 Further Assurances. In connection with this Agreement
and all transactions contemplated by this Agreement, each signatory party hereto agrees to execute and deliver such additional documents and instruments and to perform such additional acts as may be necessary or appropriate to effectuate, carry out
and perform all of the terms, provisions and conditions of this Agreement and all such transactions. 
 Section 9.11 No
Waiver. Failure of any Party to this Agreement to require performance of any provision of this Agreement shall not affect such Party’s right to full performance thereof at any time thereafter, and the waiver by any Party to this Agreement
of a breach of any provision hereof shall not constitute a waiver of any similar breach in the future or of any other breach or nullify the effectiveness of such provision. 

Section 9.12 Set Off. Each Party has the right to set off against any amounts due to the other Party hereunder any and all
amounts that the other Party owes to the first Party under this Agreement or the Related Agreements. 
 Section 9.13 Rights
of Third Parties. The provisions of this Agreement are enforceable solely by the Parties to this Agreement, and no third party (including any Limited Partner of the MLP) shall have the right, separate and apart from the Parties to this
Agreement, to enforce any provision of this Agreement or to compel any Party to this Agreement to comply with the terms of this Agreement. 

[signatures on the following page] 

  
 28 

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

			
	WESTLAKE MANAGEMENT SERVICES, INC.
		
	By:	 	/s/ Albert Chao
	Name:	 	Albert Chao
	Title:	 	President and Secretary
	
	WESTLAKE CHEMICAL PARTNERS GP LLC
		
	By:	 	/s/ Albert Chao
	Name:	 	Albert Chao
	Title:	 	President, Chief Executive Officer and Director
	
	WESTLAKE CHEMICAL PARTNERS LP
		
	By:	 	Westlake Chemical Partners GP LLC, its general partner
		
	By:	 	/s/ Albert Chao
	Name:	 	Albert Chao
	Title:	 	President, Chief Executive Officer and Director
	
	WESTLAKE CHEMICAL OPCO GP LLC
		
	By:	 	/s/ Lawrence E. Teel
	Name:	 	Lawrence E. Teel
	Title:	 	Principal Operating Officer

 Signature Page to Omnibus Agreement 

 
			
	
	WESTLAKE CHEMICAL OPCO LP
		
	By:	 	Westlake Chemical OpCo GP LLC
		
	By:	 	/s/ Lawrence E. Teel
	Name:	 	Lawrence E. Teel
	Title:	 	Principal Operating Officer
	
	WPT LLC
		
	By:	 	Westlake Chemical Investments, Inc., its manager
		
	By:	 	/s/ Albert Chao
	Name:	 	Albert Chao
	Title:	 	President and Secretary
	
	WESTLAKE LONGVIEW CORPORATION
		
	By:	 	/s/ Albert Chao
	Name:	 	Albert Chao
	Title:	 	President
	
	WESTLAKE PETROCHEMICALS LLC
		
	By:	 	Westlake Chemical Investments, Inc., its manager
		
	By:	 	/s/ Albert Chao
	Name:	 	Albert Chao
	Title:	 	President and Secretary
	
	WESTLAKE VINYLS, INC.
		
	By:	 	/s/ Albert Chao
	Name:	 	Albert Chao
	Title:	 	President and Secretary

 Signature Page to Omnibus Agreement 

 
			
	WESTLAKE PVC CORPORATION
		
	By:	 	/s/ Albert Chao
	Name:	 	Albert Chao
	Title:	 	President and Secretary
	
	WESTLAKE STYRENE LLC
		
	By:	 	Westlake Chemical Investments, Inc., its manager
		
	By:	 	/s/ Albert Chao
	Name:	 	Albert Chao
	Title:	 	President and Secretary
	
	WESTLAKE POLYMERS LLC
		
	By:	 	Westlake Chemical Investments, Inc., its manager
		
	By:	 	/s/ Albert Chao
	Name:	 	Albert Chao
	Title:	 	President and Secretary
	
	WESTLAKE VINYL CORPORATION
		
	By:	 	/s/ Albert Chao
	Name:	 	Albert Chao
	Title:	 	President and Secretary

 Signature Page to Omnibus Agreement 

 SCHEDULE I 

WESTLAKE COMPLEXES 
 Lake
Charles Assets 
  

	 	•	 	Styrene plant at the Petro Site that was started up in 1992; it is Technip ( Badger) technology and has a capacity of 570MM lb/yr. 

  

	 	•	 	Poly 3 at the Petro Site that was started up in 1998; licensed from Ineos and has a capacity of 600MM lb/ yr of LLDPE. 

  

	 	•	 	Five lines at the Poly Site with a total capacity of 850 MM lb/yr which consist of 4 autoclave units and 1 tubular unit that all make LDPE. 

 

	 	•	 	The tankage and dock at the Lake Charles Terminal to service the Styrene plant. 

  

	 	•	 	Service groups and facilities at the Petro Site, Poly Site and off site Administration building that support all of the plants. 

Calvert City Assets 
  

	 	•	 	The Chlor Alkali plant built in 1966 and occupies approximately 40 acres. It was upgraded and expanded to 275K ECU capacity in 2001 utilizing Asahi Kasei membrane technology. The feedstocks are rock salt and
electricity. 

  

	 	•	 	The VCM unit was built in 1953 utilizing B. F. Goodrich technology. The unit occupies approximately 55 acres and has an annual production capacity of 1.3 billion pounds of VCM. The feedstocks are Chlorine, Ethylene and
Oxygen as well as supplemental Ethylene Dichloride as required. 

  

	 	•	 	The PVC unit was built in 1959 and occupies approximately 26 acres. It has a current annual production capacity of 1.4 billion pounds. The unit’s feedstock is VCM produced by the Westlake VCM unit.

  
 Schedule I –
Page 1 

 SCHEDULE II 

SERVICES 
  

	 	•	 	services from the Westlake Parties’ employees in capacities equivalent to the capacities of corporate executive officers, except that those who serve in such capacities under this Agreement shall serve on a shared,
part-time basis only, unless and to the extent agreed otherwise by the Westlake Parties; 

  

	 	•	 	administrative and professional services, including, but not limited to, legal, accounting services, audit services, human resources, insurance, tax, credit, finance, government affairs and regulatory affairs;

  

	 	•	 	management of the MLP’s property and the property of the MLP’s subsidiaries in the ordinary course of business; 

  

	 	•	 	recommendations on capital raising activities to the GP’s Board of directors, including the issuance of debt or equity interests, the entry into credit facilities and other capital market transactions;

  

	 	•	 	managing or overseeing litigation and administrative or regulatory proceedings, and establishing appropriate insurance policies for us, and providing safety and environmental advice; 

 

	 	•	 	recommending the payment of distributions; and 

  

	 	•	 	managing or providing advice for other projects, including acquisitions, as may be agreed by the Westlake Parties and GP from time to time. 

  
 Schedule II –
Page 1EX-10.2

 Exhibit 10.2 

SERVICES AND SECONDMENT AGREEMENT 

by and between 

WESTLAKE CHEMICAL OPCO LP 

and 
 WESTLAKE
MANAGEMENT SERVICES, INC. 
 and 

WESTLAKE VINYLS, INC. 

and 
 WPT LLC 

and 
 WESTLAKE
PETROCHEMICALS LLC 
 August 4, 2014 
  

 
  

 TABLE OF CONTENTS 

 

							
	 	 	 	  	PAGE	 
		 	 ARTICLE I

DEFINITIONS, CONSTRUCTION
	  			
			
	1.1	 	 Definitions
	  	 	1	  
	1.2	 	 Construction
	  	 	6	  
			
		 	 ARTICLE II

SHARED SERVICES
	  			
			
	2.1	 	 Engagement of the Westlake Parties
	  	 	6	  
	2.2	 	 Common Facilities Services
	  	 	6	  
	2.3	 	 Utility Services
	  	 	8	  
	2.4	 	 Permits
	  	 	9	  
	2.5	 	 Consultations
	  	 	10	  
	2.6	 	 Relationship of the Parties
	  	 	10	  
			
		 	 ARTICLE III

OPERATING SERVICES
	  			
			
	3.1	 	 Seconded Employees of the Westlake Parties
	  	 	10	  
	3.2	 	 Owner’s Rights
	  	 	11	  
	3.3	 	 Consultations
	  	 	11	  
	3.4	 	 Title, Documents and Data
	  	 	11	  
			
		 	 ARTICLE IV

WESTLAKE PROVIDED UTILITIES
	  			
			
	4.1	 	 Engagement of the Westlake Parties
	  	 	11	  
	4.2	 	 High Pressure Steam
	  	 	11	  
	4.3	 	 Other Steam
	  	 	12	  
	4.4	 	 Consultations
	  	 	12	  
			
		 	 ARTICLE V

OWNER PROVIDED SERVICES
	  			
			
	5.1	 	 Engagement of Owner
	  	 	12	  
	5.2	 	 Owner Provided Services
	  	 	12	  
	5.3	 	 Consultations
	  	 	13	  
	5.4	 	 Relationship of the Parties
	  	 	13	  
			
		 	 ARTICLE VI

ADDITIONAL SERVICES
	  			
			
	6.1	 	 Additional Westlake Provided Services
	  	 	13	  
	6.2	 	 Additional Seconded Employees
	  	 	13	  
	6.3	 	 Additional Westlake Provided Utilities
	  	 	13	  
	6.4	 	 Additional Owner Provided Services
	  	 	14	  

  
 i 

							
	
	ARTICLE VII
 AUTHORIZED PERSONS AND EMPLOYEES
	  
   

			
	7.1	 	 Delegation
	  	 	14	  
	7.2	 	 Personnel and Secondment
	  	 	14	  
	
	ARTICLE VIII
 BUDGETS, AUDITS AND ACCOUNTING
	  
   

			
	8.1	 	 Approved Annual Budgets
	  	 	16	  
	8.2	 	 Unbudgeted Expenditures
	  	 	16	  
	8.3	 	 Accounting, Reimbursement and Fee
	  	 	17	  
	8.4	 	 Reports
	  	 	17	  
	8.5	 	 Audit and Examination
	  	 	17	  
	
	ARTICLE IX
 STANDARD OF CARE, NEGATIVE COVENANTS, CONFIDENTIAL INFORMATION AND PROPRIETARY
INVENTIONS
	  
      

			
	9.1	 	 Standard of Care
	  	 	17	  
	9.2	 	 Negative Covenants
	  	 	18	  
	9.3	 	 Proprietary Inventions and Techniques
	  	 	18	  
	
	ARTICLE X
 PAYMENT OF COSTS
	  
   

			
	10.1	 	 Payments
	  	 	18	  
	10.2	 	 Reimbursement for Emergencies
	  	 	19	  
	
	ARTICLE XI
 TAXES
	  
   

			
	11.1	 	 Embedded Tax Amounts
	  	 	20	  
	11.2	 	 Income Taxes
	  	 	20	  
	
	ARTICLE XII
 WARRANTY/CLAIMS
	  
   

			
	12.1	 	 Warranties
	  	 	21	  
	12.2	 	 Claims
	  	 	21	  
	
	ARTICLE XIII
 TERMINATION
	  
   

			
	13.1	 	 Term
	  	 	21	  
	13.2	 	 Termination
	  	 	21	  
	13.3	 	 Self Help
	  	 	22	  
	13.4	 	 General Obligations
	  	 	22	  

  
 ii 

							
	
	ARTICLE XIV
 ACCESS TO ETHYLENE ASSETS
	  
   

	
	ARTICLE XVI
 INDEMNIFICATION
	  
   

			
	16.1	 	 By the Westlake Parties
	  	 	23	  
	16.2	 	 By Owner
	  	 	23	  
	16.3	 	 Indemnification Procedures
	  	 	23	  
	
	ARTICLE XVII
 FORCE MAJEURE
	  
   

			
	17.1	 	 Force Majeure Event
	  	 	24	  
	17.2	 	 Force Majeure Notice
	  	 	24	  
	
	ARTICLE XVIII
 OTHER PROVISIONS
	  
   

			
	18.1	 	 Assignment
	  	 	24	  
	18.2	 	 Notices
	  	 	25	  
	18.3	 	 Severability
	  	 	25	  
	18.4	 	 Entire Agreement
	  	 	26	  
	18.5	 	 Amendment or Modification
	  	 	26	  
	18.6	 	 No Waiver
	  	 	26	  
	18.7	 	 Safety Regulations
	  	 	26	  
	18.8	 	 Relationship of Parties
	  	 	26	  
	18.9	 	 Governing Law
	  	 	26	  
	18.10	 	 Dispute Resolution
	  	 	26	  
	18.11	 	 Waiver of Consequential Damages
	  	 	27	  
	18.12	 	 Further Assurances
	  	 	27	  
	18.13	 	 Set Off
	  	 	27	  
	18.14	 	 Counterparts
	  	 	27	  
	18.15	 	 Rights of Third Parties
	  	 	27	  

  
 iii 

 SCHEDULES 
  

			
	SCHEDULE 1	 	 Ethylene Assets

	SCHEDULE 2	 	 Common Facilities

	SCHEDULE 3	 	 Common Facilities Services

	SCHEDULE 4	 	 Utility Services

	SCHEDULE 5	 	 Operating Services

	SCHEDULE 6	 	 Owner Provided Services

	SCHEDULE 7	 	 Accounting Procedures

  
 iv 

 SERVICES AND SECONDMENT AGREEMENT 

THIS AGREEMENT is made effective as of August 4, 2014, by and between Westlake Chemical OpCo LP, a Delaware limited
partnership (“Owner”), and Westlake Management Services, Inc., a Delaware corporation (“WMSI”), Westlake Vinyls, Inc., a Delaware corporation (“Vinyls”), WPT LLC, a Delaware
limited liability company (“WPT”) and Westlake Petrochemicals LLC, a Delaware limited liability company (“Petrochemicals”) (collectively, the “Westlake Parties”). Owner and the
Westlake Parties are sometimes referred to herein separately as “Party” or collectively as the “Parties”. 

RECITALS 

Owner is owner of the Ethylene Assets and Westlake Chemical Corporation (“Westlake Chemical”) and the
Westlake Parties are the owners of the adjacent Westlake Facilities and the Common Facilities. The Ethylene Assets are currently connected to and have been operated on an integrated basis with the Westlake Facilities.  

In order to continue to operate the Ethylene Assets and the Westlake Facilities in an efficient manner, Owner and the Westlake Parties have
agreed to common use of the Common Facilities and Utility Services. The Westlake Parties have agreed to provide certain shared services and Seconded Employees who Owner will use in the operation and maintenance of the Ethylene Assets, and Owner has
agreed to provide certain purge gas processing services and certain other services relating to the operation of the Westlake Facilities, in accordance with the terms of this Agreement. 

Furthermore, the Parties and certain of their Affiliates have agreed to provide each other with certain utilities for use in their respective
production processes. 
 Concurrent with the execution of this Agreement, Owner and the Westlake Parties or certain of their Affiliates will
enter into the Related Agreements. 
 AGREEMENT 

NOW, THEREFORE, Owner and the Westlake Parties hereby agree as follows: 

ARTICLE I 
 DEFINITIONS,
CONSTRUCTION 
 1.1 Definitions. In this Agreement, capitalized terms used, but not otherwise defined, shall have the
respective meanings given to such terms set forth below: 
 Accounting Procedures means the terms and provisions set forth in
Schedule 7. 
 Affiliate means (i) with respect to the Westlake Parties, any other Person that directly or indirectly
through one or more intermediaries is controlled by Westlake Chemical, excluding GP and any other Person that directly or indirectly through one or more intermediaries is controlled by GP (including Owner); and (ii) with respect to Owner, GP
and any other Person that directly or indirectly through one or more intermediaries is controlled by GP. As used herein, the term “control” means the possession, directly or indirectly, 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.  

Applicable Law means all statutes, regulations, rules, ordinances, codes, licenses, permits, orders, approvals and rules of
common law of each Governmental Authority having jurisdiction over the Parties, including Environmental Laws, all health, building, fire, safety and other codes, ordinances and requirements and all applicable standards of the National Board of Fire
Underwriters, in each case, as amended, and any judicial or administrative interpretation thereof, including any judicial or administrative order, consent, decree, judgment or settlement; in each case, as applicable to Owner, the Westlake Parties,
the Ethylene Assets or the Westlake Facilities.  

  
 1 

 Agreement means this Services and Secondment Agreement, as the same may be amended.

 Approved Annual Budget shall mean the budget so labeled and already approved by Owner and the Westlake Parties for the
period commencing on the date of this Agreement and ending December 31, 2014 and the budget for any applicable succeeding Fiscal Year proposed by the Westlake Parties, subject to Section 8.1. 

Bankruptcy Proceeding means with respect to a Party or entity, such Party or entity (i) is dissolved (other than pursuant
to a consolidation, amalgamation or merger); (ii) becomes insolvent or is unable to pay its debts or fails or admits in writing its inability generally to pay its debts as they become due; (iii) makes a general assignment, arrangement or
composition with or for the benefit of its creditors; (iv) institutes a proceeding seeking a judgment of insolvency or bankruptcy or any other relief under any bankruptcy or insolvency law or other similar law affecting creditors’ rights;
(v) has instituted against it a proceeding seeking a judgment of insolvency or bankruptcy or any other relief under any bankruptcy or insolvency law or other similar law affecting creditors’ rights, or a petition is presented for its
winding up or liquidation, and any such proceeding or petition is not dismissed, discharged, stayed or restrained, in each case within 30 days thereafter; (vi) has a resolution passed for its winding-up, official management or liquidation
(other than pursuant to a consolidation, amalgamation or merger); (vii) seeks or becomes subject to the appointment of an administrator, provisional liquidator, conservator, receiver, trustee, custodian or other similar official for it or for
all or substantially all its assets; (viii) has a secured party take possession of all or substantially all its assets or has a distress, execution, attachment, sequestration or other legal process levied, enforced, or sued on or against all or
substantially all its assets and such secured party maintains possession, or any such process is not dismissed, discharged, stayed or restrained, in each case within 30 days thereafter; (ix) causes or is subject to any event with respect to it
which, under the applicable laws of any jurisdiction, has an analogous effect to any of the events specified in clauses (i) to (viii) (inclusive); or (x) takes any action in furtherance of, or indicating its consent to, approval of,
or acquiescence in, any of the foregoing acts. 
 Base Rate shall mean, interest compounded on a Monthly basis, at the rate
per annum equal to the one-month term, London Interbank Offered Rate (LIBOR rate) for U.S. dollar deposits, as published by The Wall Street Journal or if not published, then by the Financial Times of London. 

Business Day means any day other than a Saturday, a Sunday, or a holiday on which national banking associations in the State of
Texas are closed. 
 Calvert City Assets means an ethylene plant in Calvert City, Kentucky, owned by Owner and more fully
described on Schedule 1. 
 Capital Expenditures means all Expenditures that are capitalized by the Westlake Parties or
Owner, as applicable in accordance with GAAP and the relevant Party’s accounting capitalization procedures, in each case as consistently applied and as in effect from time to time. 

Claims shall have the meaning set forth in Section 15.1. 

Code means the Internal Revenue Code of 1986, as amended. 

Common Facilities means certain facilities owned by the Westlake Parties and their Affiliates in Calvert City, Kentucky and Lake
Charles, Louisiana, and described on Schedule 2, and any other facilities owned by the Westlake Parties and their Affiliates as may be required for the performance of the Shared Services. 

Common Facilities Services means those services described in Section 2.2 and Schedule 3. 

Common Units means common units representing limited partner interests in the MLP. 

  
 2 

 Conflicts Committee shall have the meaning ascribed to such term in the MLP’s
agreement of limited partnership, as amended from time to time. 
 Default Rate shall mean the Base Rate plus two percentage
points per annum, applicable on the first Business Day prior to the due date of payment and thereafter on the first Business Day of each succeeding Month; provided, however, that the Default Rate shall never exceed the maximum rate permitted by
Applicable Law. 
 Demineralized Water means demineralized water produced by the Lake Charles Assets. 

Dispute shall have the meaning set out in Section 17.10(a). 

Emergency means the events described in Section 10.2(b). 

Environmental Law or Environmental Laws means any and all Applicable Laws pertaining to (i) pollution, protection of the
environment (including natural resources), or workplace health and safety, (ii) any Release, threatened Release or exposure of any Person or property to Hazardous Substances, or (iii) the generation, manufacture, processing, distribution,
use, treatment, storage, disposal, transport, arrangement for disposal or transport, or handling of Hazardous Substances. Without limiting the foregoing, Environmental Laws include including the Comprehensive Environmental Response, Compensation and
Liability Act, 42 U.S.C. § 9601 et seq.; the Resource Conservation and Recovery Act, 42 U.S.C. § 6901 et seq.; the Federal Water Pollution Control Act, 33 U.S.C. § 1251 et seq.; the Clean Air Act, 42 U.S.C.
§ 7401 et seq.; the Hazardous Materials Transportation Act, 49 U.S.C. § 5101 et seq.; the Toxic Substances Control Act, 15 U.S.C. §§ 2601 et seq.; the Oil Pollution Act, 33 U.S.C. § 2701 et seq.; the
Emergency Planning and Community Right-to-Know Act, 42 U.S.C. § 11001 et seq.; the Safe Drinking Water Act, 42 U.S.C. §§ 300f through 300j; the Occupational Safety and Health Act, 29 U.S.C. § 651 et seq.; and all
similar Applicable Laws of any Governmental Authority having jurisdiction over the Ethylene Assets or the Westlake Facilities or their respective operations, and all amendments to such Applicable Laws and all regulations implementing any of the
foregoing. 
 Ethylene Assets means the Calvert City Assets, the Lake Charles Assets and the Ethylene Pipeline, collectively.

 Ethylene Pipeline means an ethylene pipeline from Mont Belvieu, Texas to Longview, Texas, owned by Owner. 

Ethylene Sales Agreement means the Ethylene Sales Agreement between Owner and certain Affiliates of Westlake Chemical, dated of
even date herewith, as the same may be amended. 
 Expenditure means a cost, expense or expenditure. 

Feedstock Supply Agreement means the Feedstock Supply Agreement between Owner and Petrochemicals, dated of even date herewith,
as the same may be amended. 
 Fiscal Year means each 12 month period beginning on the first day of January of a year and
ending on December 31 of the same year; provided, the first Fiscal Year hereunder shall begin on the date of this Agreement and shall end on December 31, 2014; and further provided, the last Fiscal Year shall end at the expiration or
termination of this Agreement. 
 First Approved Annual Budget shall have the meaning set forth in Section 8.1(a). 

Force Majeure Event means the following events, conditions and circumstances, and all similar events, conditions and
circumstances of the kind enumerated herein, for which a Party is rendered, wholly or substantially, unable to perform its obligations hereunder, except in each case, (i) to the extent any of the following is within the reasonable control of,
could be sufficiently alleviated by the reasonable efforts of, or is caused by the gross negligence, breach or default of, the Party claiming the Force Majeure, and provided that, the Party claiming the Force Majeure takes all reasonable efforts to
mitigate the effects of the Force Majeure and (ii) that changes in costs 

  
 3 

 
of goods and services (including amounts payable under the Related Agreements), changes in costs of regulatory or other compliance with Applicable Law, and the lack of finances do not constitute
Force Majeure: 
 (a) any act of God or the public enemy, fire, explosion, perils of the sea, flood, unusually bad weather
(including hurricanes, tornadoes and ice storms), drought, war, terrorism, national emergency, riot, sabotage or embargo, and any interruption of or delay in transportation, electrical or other utility shortage or blackout, or any inadequacy or
shortage or failure or breakdown of supply of raw materials or equipment or mechanical breakdown or other production shutdown or accident to machinery; 

(b) any Labor Difficulties from whatever cause arising and whether or not the demands of the employees involved are within the
power of the claiming Party to concede, including Labor Difficulties affecting transportation facilities, raw material supplies or services to the Westlake Facilities, Ethylene Assets or Common Facilities, which shall constitute events of Force
Majeure to the extent that such Labor Difficulties affect a Party’s ability to perform its obligations hereunder; 

(c) compliance with any order, action, direction or request of any Governmental Authority or with any Applicable Law not
brought about by any action or omission on the part of the Party claiming the Force Majeure. 
 GAAP means United States
generally accepted accounting principles as in effect from time to time. 
 Governmental Authority means any governmental
authority, agency, department, commission, bureau, board, instrumentality, court or quasi-governmental authority of any foreign nation, the United States, or any state that has or obtains jurisdiction over the matter in question, or any political
subdivision thereof. 
 GP means Westlake Chemical Partners GP LLC, the general partner of the MLP. 

High Pressure Steam means steam described in Schedule 6 under the heading “High Pressure Steam”, all within the
tolerances and in compliance with the specifications therein contained. 
 Indemnified Party shall have the meaning set forth
in Section 15.3(a). 
 Indemnifying Party shall have the meaning set forth in Section 15.3(a). 

Initial Term shall have the meaning set forth in Section 13.1. 

Labor Difficulties means strikes and lockouts, both legal and illegal, and other forms of organized actions, howsoever called,
by labor or other personnel to stop or significantly reduce or slow down work or production or to withdraw or withhold labor or services. 

Lake Charles Assets means ethylene plants “Petro 1” and “Petro 2” and the co-products storage and shipping
area in Lake Charles, Louisiana, owned by Owner and more fully described on Schedule 1. 
 Limited Partner is defined in the
Partnership Agreement. 
 MLP means Westlake Chemical Partners LP. 

Month means calendar month. 

Monthly Invoice shall have the meaning set forth in Section 10.1(a). 

Non-Discriminatory Basis means performing any Service or taking any other action without a preference or bias which unduly
favors the Westlake Facilities or any part or operation thereof over the Ethylene Assets or any part or operation thereof or vice versa. 

  
 4 

 Omnibus Agreement means the Omnibus Agreement between Owner, Westlake Chemical and
certain of its Affiliates, dated of even date herewith, as the same may be amended. 
 Operating Expenses means all
Expenditures that are treated as operating expenses in accordance with GAAP and the Westlake Parties’ accounting procedures, in each case as consistently applied and as in effect from time to time. 

Operating Services have the meaning set forth in Section 3.1. 

Owner shall have the meaning set forth in the first paragraph. 

Owner Group shall have the meaning set forth in Section 15.2. 

Owner Indemnified Parties shall have the meaning set forth in Section 15.1. 

Owner Provided Services shall have the meaning set forth in Section 5.2. 

Partnership Agreement means the First Amended and Restated Agreement of Limited Partnership of Westlake Chemical Partners LP,
dated as of August 4, 2014, to which reference is hereby made for all purposes of this Agreement. No amendment or modification to the Partnership Agreement subsequent to the date hereof shall be given effect for the purposes of this Agreement
unless consented to by each of the Parties to this Agreement. 
 Party or Parties means any of the entities
named in the first paragraph to this Agreement and any respective successors or permitted assigns in accordance with the provisions of this Agreement. 

Period of Secondment shall have the meaning set forth in Section 7.2(b). 

Permit means all permits, licenses, franchises, consents, authorizations, certifications, exemptions, variances, and approvals,
as necessary under Applicable Laws for operating the Ethylene Assets. 
 Person means any natural person, corporation, limited
liability company, partnership, joint venture, trust, unincorporated organization, association, joint stock company or Governmental Authority. 

Petrochemicals has the meaning set forth in the first paragraph. 

Purge Gas means such purge gas from the LDPE Plant, located near the Lake Charles Assets, and owned by Westlake Polymers LLC.

 Related Agreements means the Site Lease Agreements, the Omnibus Agreement, the Ethylene Sales Agreement and the Feedstock
Supply Agreement. 
 Renewal Term shall have the meaning set forth in Section 13.1. 

Seconded Employee(s) shall have the meaning set forth in Section 7.2(b). 

Services means the Operating Services, the Shared Services, the Westlake Provided Utilities and the Owner Provided Services.

 Shared Services shall have the meaning set forth in Section 2.1. 

Site Lease Agreements means, collectively, (i) the Calvert City Site Lease Agreement between Owner and Vinyls; and
(ii) the Lake Charles Site Lease Agreement between Owner, WPT and Petrochemicals, each dated of even date herewith, as the same may be amended. 

Subject Services shall have the meaning set forth in Section 13.3. 

  
 5 

 Term shall have the meaning set forth in Section 13.1. 

Utility Services has the meaning set forth in Section 2.3(a). 

Vinyls shall have the meaning set forth in the first paragraph. 

Westlake Chemical shall have the meaning set forth in the Recitals. 

Westlake Facilities means certain facilities all owned by the Westlake Chemical, the Westlake Parties and their Affiliates in
Calvert City, Kentucky and Lake Charles, Louisiana and other assets and properties near the Ethylene Assets, other than the Common Facilities. 

Westlake Group shall have the meaning set out in Section 15.1. 

Westlake Indemnified Parties shall have the meaning set forth in Section 15.2. 

Westlake Parties shall have the meaning set forth in the first paragraph. 

Westlake Provided Services means the Operating Services and the Shared Services. 

Westlake Provided Utilities shall have the meaning set forth in Section 4.1. 

WMSI shall have the meaning set forth in the first paragraph. 

WPT shall have the meaning set forth in the first paragraph. 

1.2 Construction. In construing this Agreement, the following principles shall be followed: (a) no consideration shall be
given to the captions of articles, sections or subsections; (b) no consideration shall be given to the fact or presumption that one Party had a greater or lesser hand in drafting this Agreement; (c) the word “includes” and its
syntactic variants means “includes, but is not limited to” and corresponding syntactic variant expressions; and (d) the plural shall be deemed to include the singular, and vice versa. 

ARTICLE II  
 SHARED
SERVICES 
 2.1 Engagement of the Westlake Parties. Subject to the terms of this Agreement, Owner hereby
engages the Westlake Parties to perform the Common Facilities Services (as defined below) and make available the Utility Services (as defined below) (together, the “Shared Services”). Owner hereby authorizes the Westlake
Parties to perform all acts that are necessary or appropriate in the reasonable judgment of the Westlake Parties, to perform the Shared Services and the Westlake Parties hereby accept such engagement and agree to perform all acts necessary or
appropriate in the reasonable judgment of the Westlake Parties, to perform the Shared Services, all in accordance with the terms and conditions and subject to the limitations set forth in this Agreement. 

2.2 Common Facilities Services. 

(a) The Westlake Parties hereby grant Owner full and free access to and use of the Common Facilities in accordance with the Westlake
Parties’ policies, procedures and requirements and at all times in accordance with the terms of this Agreement, as necessary or appropriate for Owner to operate the Ethylene Assets; provided that such access shall not materially and
unreasonably interfere with the operations of the Westlake Facilities; and 

  
 6 

 (b) The Westlake Parties shall have the responsibility for maintaining the Common Facilities for
use by the Westlake Facilities and the Ethylene Assets, including, but not limited to, the following services and those listed on Schedule 3: 

(i) issuing and enforcing health, safety and environmental policies, procedures and requirements and other activities relating to the Common
Facilities, and training employees of the Westlake Parties, Owner, their Affiliates or their subcontractors with respect thereto; 
 (ii)
training all employees of the Westlake Parties and their Affiliates employed in connection with the operation and maintenance of the Common Facilities; 

(iii) performing safety reviews associated with the Common Facilities in accordance with the applicable policies, procedures and requirements;

 (iv) taking such actions as they deem necessary to keep the Common Facilities in sound operating condition, including overseeing site
administration and preparing and maintaining daily operating logs and records regarding the operation and maintenance of the Common Facilities in accordance with the policies, procedures and requirements of this Agreement; 

(v) providing such information for technical evaluation of the Common Facilities as may be reasonably requested by Owner subject to the terms
and conditions of this Agreement at Owner’s sole cost and expense; 
 (vi) carrying out such periodic performance tests of the Common
Facilities as they deem necessary to operate the Common Facilities in accordance with this Agreement and recommending to Owner any remedial action that the Westlake Parties consider necessary or prudent to correct any operational deficiencies
revealed by analysis of the test results or otherwise discovered during operation of the Common Facilities, and, at Owner’s sole cost and expense, carrying out such additional tests as Owner may reasonably request (provided that such additional
tests do not materially and unreasonably interfere with the operation by the Westlake Parties of the Westlake Facilities); 
 (vii)
providing such engineering services as they deem necessary for the operation and maintenance of the Common Facilities in accordance with this Agreement; 

(viii) managing, organizing and supervising any contracted and subcontracted maintenance, repair and testing services used to carry out
scheduled inspections, periodic overhauls, scheduled and unscheduled maintenance, and any major breakdown repairs of the Common Facilities; 

(ix) advising Owner by telephone (with confirmation in writing) as soon as practicable of the occurrence of any event or the reasonable
probability of occurrence of any event (including a Force Majeure Event) that could have a material adverse effect or has had a material adverse effect on the operation and maintenance of the Common Facilities; 

(x) maintaining accounting records regarding the Common Facilities Services in accordance with this Agreement; 

(xi) promptly notifying Owner of all material defects in the Common Facilities; and 

(xii) procuring of all goods and services they deem necessary to maintain the Common Facilities; and storing all items so procured in
accordance with the same practices and procedures used by the Westlake Parties in connection with the storage of similar items for the Westlake Facilities. 

(c) Owner hereby engages the Westlake Parties to provide the services described in this Section 2.2(c), including all necessary or
desirable services in connection therewith, for the benefit of the Westlake Facilities and the Ethylene Assets: 
 (i) maintaining or
causing to be maintained all roads, easements, yards, parking areas, walkways, environmental compliance equipment and utilities located on or at the Common Facilities or necessary for access to or for the operation and maintenance of the Ethylene
Assets and the Common Facilities; 

  
 7 

 (ii) maintaining or causing to be maintained fire protection, health equipment and safety
equipment required in connection with the operation and maintenance of the Ethylene Assets and the Common Facilities; 
 (iii) providing or
causing to be provided reasonably adequate security, firefighting, wastewater treatment and emergency response services (including fire brigade, rescue and hazmat teams) for the Ethylene Assets and the Common Facilities in accordance with standards
established by Applicable Law and not less than the quality being used in the operation of the Common Facilities and the Ethylene Assets as of the date of this Agreement, and as otherwise mutually agreed upon by the Parties; 

(iv) providing or causing to be provided transportation, loading and unloading services (including tank car and barge facilities and repair
services) for use in the movement of such raw materials, process chemicals and other supplies and fuels as required in connection with the operation of the Ethylene Assets and the Common Facilities; 

(v) providing accounting and human resources services, marketing services and purchasing of such chemicals and supplies as required in
connection with the operation of the Ethylene Assets and the Common Facilities; 
 (vi) providing information technology, telephone, office
support and other technology and support services for the Ethylene Assets and the Common Facilities; 
 (vii) providing water control
management services, quality control and laboratory services required for the Ethylene Assets and the Common Facilities; 
 (viii) providing
cooling tower services and waste treatment in connection with the operation of the Ethylene Assets and the Common Facilities; and 
 (ix)
providing housekeeping services for the Ethylene Assets and the Common Facilities, including HVAC, janitorial services, weed control, and trash pickup, 

(subsections (a), (b) and (c), collectively, the “Common Facilities Services”). 

2.3 Utility Services. 

(a) The Westlake Parties are party to various contracts with utilities and other parties pursuant to which the Ethylene Assets and the
Westlake Facilities receive electricity, natural gas, nitrogen, water and other utility services described on Schedule 4 (collectively, the “Utility Services”) necessary to operate and maintain the Ethylene Assets, the
Westlake Facilities and the Common Facilities. Subject to the terms and provisions of this Agreement, the Westlake Parties shall use commercially reasonable efforts to make available to Owner electricity, natural gas, fuel gas, boiler feed water,
cooling water, potable water, steam, process steam and such other services as may be needed to operate the Ethylene Assets. The quality, standards and specifications for such Utility Services shall be suitable for the operation of the Common
Facilities and the Ethylene Assets in accordance with standards and quality being used in the operation of the Common Facilities and the Ethylene Assets as of the date of this Agreement or as may be reasonably requested by Owner based upon changed
needs. It is understood that the Utility Services are furnished by outside providers who supply services to the Westlake Facilities and that Owner shares the expense related to such services in accordance with this Agreement. The Westlake Parties
are not public utilities or common carriers and do not sell, provide or furnish utility services or utilities, and are not in the business of selling, providing or furnishing such services or utilities, but rather share the costs thereof in
accordance with this Agreement. 
 (b) Owner shall provide the Westlake Parties with timely information regarding any changes in
Owner’s requirements for Utility Services and the Westlake Parties shall consult with Owner and consider Owner’s interest on an equal footing along with the interests of the Westlake Parties concerning any negotiations with third parties
from whom the Westlake Parties obtain or propose to obtain Utility Services relating to the Common Facilities or the Ethylene Assets. 

  
 8 

 (c) The Westlake Parties shall not enter into contracts with third Persons with respect to the
provision of Utility Services to the Ethylene Assets without the prior written consent of Owner, which consent shall not be unreasonably withheld. At the request of Owner, the Westlake Parties shall use commercially reasonable efforts to
(i) add Owner as a party to the Westlake Parties’ utility contract or (ii) reach a mutually acceptable accommodation with one or more of the Westlake Parties’ utility providers whereby each Party would be able to receive utility
services on an individual basis. 
 (d) Notwithstanding anything to the contrary, in the event that the Westlake Parties’ delivery of
electricity, water or other Utility Service to Owner is challenged before a judicial, regulatory or administrative body and the Westlake Parties determine, in their sole judgment, that it is likely that such body will determine that, in connection
with such challenge, the Westlake Parties or their affected Affiliate will be subject to regulation under Applicable Law as a consequence of such delivery of electricity, water or other Utility Service (including the regulation or classification of
the Westlake Parties or such Affiliate, as the case may be, as a “utility,” “public utility,” “retail public utility,” “electric utility,” “retail electric utility,” “common carrier,”
“water and sewer utility” or similar designation), then the Westlake Parties and Owner will cooperate in an attempt to restructure the provision of such Service in a manner which will not subject the Westlake Parties to such regulation
(provided that any such restructure does not materially and unreasonably interfere with the Westlake Parties’ or Owner’s operations or cause significant net economic detriment to the Westlake Parties or Owner). If such restructuring
efforts are unsuccessful or not reasonably practicable, then the Westlake Parties shall have the right to require Owner to obtain from a third party such electricity, water or other Utility Service that would cause the Westlake Parties to be subject
to regulation as a utility, and the Westlake Parties will cooperate with Owner in connection therewith and shall grant such access rights or similar rights as may be reasonably necessary for such Utility Service to be so provided to Owner. In the
event that a challenge proceeds despite restructuring, then the Westlake Parties will provide notice to Owner of any such challenge and the Westlake Parties and Owner will cooperate to resist the challenge. The cost of resisting such challenge
pursuant to a mutually agreed upon course of action shall be paid equally by the Westlake Parties and Owner. Any penalty, fee or fine imposed on the Westlake Parties or their Affiliate, as a result of the Westlake Parties’ delivery of
electricity, water or other Utility Service to Owner shall be shared pro rata by the Westlake Parties and Owner in proportion to the consumption of the Utility Service being challenged. If such challenges and restrictions are removed, pursuant to
appeal or otherwise, so that the Westlake Parties and their Affiliates will not be subject to such regulation, Owner will resume receipt of the affected Utility Service in accordance with the terms of this Agreement. 

(e) If the Westlake Parties become aware of any planned or actual outage or involuntary reduction with respect to any of the Utility Services,
the Westlake Parties shall promptly give notice thereof to Owner and the Westlake Parties shall coordinate such outage or reduction as nearly as reasonably practicable on a Non Discriminatory Basis so as to minimize adverse impact on each
Party’s respective operations (with the standard being the equitable allocation of such Utility Services between the Westlake Facilities and the Ethylene Assets). 

2.4 Permits. 
 (a)
Subject to section 3.5 of each of the Site Lease Agreements, the Westlake Parties shall use commercially reasonable efforts to (i) obtain and maintain with respect to the Ethylene Assets, the Westlake Facilities and the Common Facilities, all
Permits for which Owner is not a necessary and indispensable party, including with respect to Environmental Law, reasonably necessary in connection with the ownership or operation thereof, and (ii) use commercially reasonable efforts to comply
with all conditions and requirements imposed by such Permits, including all sampling, testing and monitoring required by any Permit or Governmental Authority in connection with any Permit. 

(b) Owner shall cooperate in all reasonable respects with the Westlake Parties in Westlake’s obtaining and maintaining all necessary
Permits, including Owner’s signing, submitting and prosecuting all applications or submissions for Permits with respect to the Ethylene Assets for which Owner is a necessary and indispensable party and taking every other action reasonably
required of Owner to enable the Westlake Parties to perform their obligations under Section 2.4(a). Owner shall notify the Westlake Parties promptly of any written notification that 

  
 9 

 
Owner receives of any investigation, proceeding or other action commenced by any Governmental Authority relating to any such Permit or Applicable Law with respect to the Ethylene Assets. Owner
shall promptly provide the Westlake Parties with copies of any and all written notices or other communications received by Owner from any Government Authority with respect to the Ethylene Assets and, at the reasonable request of the Westlake
Parties, any other information or document that is within Owner’s possession relating to such Ethylene Asset Permits or any Westlake obligations thereunder. 

2.5 Consultations. 

(a) The Westlake Parties and Owner agree to meet for the purpose of coordinating outages or involuntary reductions in the availability of the
Common Facilities on a Non-Discriminatory Basis so as to minimize adverse impact on each Party’s respective operations (with the standard being the equitable allocation of such services between the Westlake Facilities and the Ethylene Assets).
The Westlake Parties shall provide notice of any outages or reductions in availability of Common Facilities to Owner promptly after becoming aware of any such outage or reduction. The Parties shall commit to keep each other timely informed about
planned turnarounds, shutdowns, major technical projects, capital projects, significant operational events and other major events that are relevant to the safe and efficient operation of the Ethylene Assets and the performance of Owner’s
obligations under this Agreement. 
 (b) At Owner’s request from time to time, the Westlake Parties shall consult with Owner with
respect to the performance of the Shared Services and shall provide to Owner such information as may be reasonably requested by Owner regarding the performance of the Shared Services. Without limiting the foregoing, the Westlake Parties and Owner
shall consult as frequently as reasonably necessary regarding the scope of Shared Services and particular circumstances that may require an adjustment to the scope of any such Shared Services. The Westlake Parties and Owner agree that the Ethylene
Assets will be operated to the maximum extent possible in an efficient manner with the Westlake Facilities, but in any event in a manner that permits Owner to comply with its obligations under this Agreement and the Related Agreements. 

(c) The Westlake Parties shall deliver to Owner at least (i) twelve months advance written notice of any permanent planned shutdown of
the Westlake Facilities and (ii) nine months advance written notice of any planned reconfiguration of the Westlake Facilities that is reasonably anticipated to result in the Ethylene Assets being shutdown for more than three months (excluding
planned maintenance turnarounds). The Westlake Parties represent to Owner that, as of the date of this Agreement, they are not considering a permanent shutdown of the Westlake Facilities or any changes to the Westlake Facilities that would have a
material adverse effect on the operation of the Westlake Facilities or the Ethylene Assets. 
 2.6 Relationship of the
Parties. At all times during the performance of the Shared Services hereunder, all Persons performing such Shared Services (including agents, temporary employees, independent third parties and consultants) shall be construed as being
independent from the Owner, and such Persons shall not be considered or deemed to be an employee of Owner or its Affiliates nor entitled to any employee benefits of Owner or its Affiliates as a result of this Agreement. Notwithstanding anything to
the contrary expressed or implied, this Agreement shall not constitute or create any agency, joint venture, partnership or other fiduciary relationship or any fiduciary duty or fiduciary obligation, all of the same being hereby expressly disclaimed
and waived. 
 ARTICLE III 

OPERATING SERVICES 

3.1 Seconded Employees of the Westlake Parties. Subject to the terms of this Agreement, the Westlake Parties agree
to provide Seconded Employees (as defined in Section 7.2(b)) who, in their capacity as employees of the Owner, will perform the services described on Schedule 5, except as outsourced by Owner to third party service providers (the
“Operating Services”), in order for the Owner to operate the Ethylene Assets in an efficient manner with the Westlake Facilities, and in a manner that permits Owner to comply with its obligations under the Ethylene Sales
Agreement and Feedstock Supply Agreement. The Seconded Employees will perform the Operating Services in accordance with the terms and conditions and subject to the limitations set forth in this Agreement.  

  
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 3.2 Owner’s Rights. The Seconded Employees shall be subject to the direction
and control of Owner. The Westlake Parties shall respond in a commercially reasonable manner to all instructions, notices, requests or inquiries from Owner with respect to the Seconded Employees. Decisions, acts or omissions so undertaken by the
Seconded Employees or the Westlake Parties with respect to the Seconded Employees pursuant to the direction and control of Owner shall not give rise to any breach of or default under this Agreement by the Westlake Parties or liability to the
Westlake Parties provided that the Westlake Parties otherwise act in accordance with the requirements of Section 3.1. 
 3.3
Consultations. The Westlake Parties and Owner shall consult as frequently as reasonably necessary regarding the scope of Operating Services to be performed by the Seconded Employees and particular circumstances that may
require an adjustment to the Westlake Parties’ obligation to provide the Seconded Employees, and shall keep each other timely informed about planned turnarounds, shutdowns, major technical projects, capital projects, significant operational
events and other major events that are relevant to the safe and efficient operation of the Ethylene Assets and the Westlake Facilities and the performance of the Parties’ respective obligations under this Agreement. 

3.4 Title, Documents and Data. Title to all materials, equipment, supplies, consumables, spare parts and other items purchased
or obtained by the Westlake Parties for or on behalf of the Ethylene Assets or Owner shall pass immediately to and vest in Owner free and clear of all liens or encumbrances (other than liens and security interests securing any unpaid portion of the
purchase price for the same) upon passage of title from the vendor or supplier thereof. All materials, data and documents prepared or developed by the Westlake Parties or their employees, representatives or contractors prior to or during the Term of
this Agreement for Owner in connection with the Seconded Employees’ performance of the Operating Services, including all manuals, data, designs, drawings, plans, specifications and reports, shall belong to Owner. All such materials in whatever
form, including electronic copies and databases, shall be provided promptly to Owner following any termination of this Agreement, or at such other times as Owner may reasonably direct. 

ARTICLE IV 
 WESTLAKE
PROVIDED UTILITIES 
 4.1 Engagement of the Westlake Parties. Subject to the terms of this Agreement, Owner
hereby engages the Westlake Parties to, or to cause their Affiliates to, make available the utility services described in Sections 4.2 and 4.3 (the “Westlake Provided Utilities”) and authorizes the Westlake Parties to
perform, or cause to be performed, all acts that are necessary or appropriate in the Westlake Parties’ reasonable judgment to provide the Westlake Provided Utilities. The Westlake Parties hereby accept such engagement and agree to perform, or
cause to be performed, all acts necessary or appropriate in the Westlake Parties’ reasonable judgment to provide the Westlake Provided Utilities, all in accordance with the terms and conditions and subject to the limitations set forth in this
Agreement. The Westlake Parties agree to provide, or cause to be provided, the Westlake Provided Utilities to permit the Ethylene Assets to be operated to the maximum extent possible in an efficient manner with the Westlake Facilities, but in any
event in a manner that permits Owner to comply with its obligations under the Ethylene Sales Agreement and Feedstock Supply Agreement. 

4.2 High Pressure Steam. The Westlake Parties shall, upon reasonable request by Owner make, or cause
certain of their Affiliates to, make available to Owner High Pressure Steam produced at a cost to Owner as incurred by the Westlake Parties or such Affiliates in the production of such High Pressure Steam and calculated in accordance with a formula
as agreed between the Parties, and at sufficient pressure, amounts, and of such quality, standards and specifications suitable for the operation of the Ethylene Assets, in accordance with standards and quality being used in the operation of the
Ethylene Assets as of the date of this Agreement, or as may be reasonably requested by Owner based upon changed needs. The Westlake Parties shall use commercially reasonable efforts to, or cause their Affiliates to, make available such High Pressure
Steam when requested by Owner; provided that the Westlake Parties shall not be obligated to make, or cause its Affiliates to make available High Pressure Steam hereunder if doing so would have a material adverse effect on the operations of the
Westlake Facilities. Owner shall provide reasonable notice to the Westlake Parties of the approximate date, time and quantity of each of its requirements of the High Pressure Steam. 

  
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 4.3 Other Steam. The Westlake Parties may, or may cause certain of its Affiliates
to, supply Owner with any steam (other than High Pressure Steam) produced in the operation of the Westlake Facilities, which is not required by such operation and is required for Owner’s operation, at a cost to Owner as incurred by the Westlake
Parties or such Affiliates in the production of such steam; provided that the Westlake Parties shall not be obligated to make, or cause its Affiliates to make available steam hereunder if doing so would have a material adverse effect on the
operations of the Westlake Facilities. Owner shall provide reasonable notice to the Westlake Parties of the approximate date, time and quantity of each of its requirements of such steam. 

4.4 Consultations. At Owner’s request from time to time, the Westlake Parties shall consult with Owner with respect to the
performance of the Westlake Provided Utilities and shall provide to Owner such information as may be reasonably requested by Owner regarding the performance of the Westlake Provided Utilities. Without limiting the generality of the foregoing, the
Westlake Parties and Owner shall consult as frequently as reasonably necessary regarding the scope of Westlake Provided Utilities and particular circumstances that may require an adjustment to the scope of any Westlake Provided Utilities, and shall
keep each other timely informed about planned turnarounds, shutdowns, major technical projects, capital projects, significant operational events and other major events that are relevant to the safe and efficient operation of the Ethylene Assets and
the Westlake Facilities and the performance of the Parties’ respective obligations under this Agreement. 
 ARTICLE V 

OWNER PROVIDED SERVICES 

5.1 Engagement of Owner. Subject to the terms of this Agreement, the Westlake Parties and certain of their Affiliates hereby
engage Owner to perform the Owner Provided Services (as defined below) and authorize Owner to perform all acts that are necessary or appropriate in Owner’s reasonable judgment to perform the Owner Provided Services. Owner hereby accepts such
engagement and agrees to perform all acts necessary or appropriate in Owner’s reasonable judgment to perform the Owner Provided Services, all in accordance with the terms and conditions and subject to the limitations set forth in this
Agreement. Owner agrees to provide the Owner Provided Services to permit the Westlake Facilities to be operated to the maximum extent possible in an efficient manner with the Owner Facilities, but in any event in a manner that permits the Westlake
Parties to comply with their obligations under the Ethylene Sales Agreement and Feedstock Supply Agreement. 
 5.2 Owner Provided
Services. 
 (a) High Pressure Steam. Owner shall, upon reasonable request by the Westlake Parties make available to
the Westlake Parties High Pressure Steam produced by the Ethylene Assets at a cost to the Westlake Parties as incurred by Owner in the production of such High Pressure Steam, and at sufficient pressure, amounts, and of such quality, standards and
specifications suitable for the operation of the Westlake Facilities, in accordance with standards and quality being used in the operation of the Westlake Facilities as of the date of this Agreement, or as may be reasonably requested by the Westlake
Parties based upon changed needs. Owner shall use commercially reasonable efforts to make available such High Pressure Steam when requested by the Westlake Parties; provided that Owner shall not be obligated to make available High Pressure Steam
hereunder if doing so would have a material adverse effect on the operations of the Ethylene Assets. The Westlake Parties shall provide reasonable notice to Owner of the approximate date, time and quantity of each of their requirements of High
Pressure Steam. 
 (b) Other Steam. Owner may supply the Westlake Parties with any steam (other than High Pressure Steam)
produced in the operation of the Ethylene Assets, which is not required by such operation and is required for the Westlake Parties’ operation, at a cost to the Westlake Parties as incurred by Owner in the production of such steam; provided that
Owner shall not be obligated to make available steam hereunder if doing so would have a material adverse effect on the operations of the Ethylene Assets. The Westlake Parties shall provide reasonable notice to Owner of the approximate date, time and
quantity of each of its requirements of such steam. 
 (c) Purge Gas Services. Owner shall receive for processing and
purification from the Westlake Parties or their Affiliate and return to the Westlake Parties or their Affiliates, at a cost to the Westlake Parties as set forth in Schedule 6, all of the Purge Gas. Owner shall provide such Purge Gas processing and
purification services in accordance with standards and quality being used in the Westlake Facilities as of the date of this Agreement, or as may be reasonably requested by the Westlake Parties based upon changed needs. Owner shall use commercially

  
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reasonable efforts to make available such Purge Gas purification services when requested by the Westlake Parties; provided that Owner shall not be obligated to make available the purge gas
purification services hereunder if doing so would have a material adverse effect on the operations of the Ethylene Assets. The Westlake Parties shall provide reasonable notice to Owner of the approximate date and time of their requirement for purge
gas purification services and the volume of Purge Gas for processing. 
 (d) Demineralized Water. Owner shall, upon reasonable
request by the Westlake Parties make available to the Westlake Parties or their Affiliates Demineralized Water, at a cost to the Westlake Parties as incurred by Owner in relation to such Demineralized Water, and in sufficient amounts, and of such
quality, standards and specifications suitable for the operation of the Westlake Facilities, in accordance with the standards and quality being used in the operation of the Westlake Facilities as of the date of this Agreement, or as may be
reasonably requested by the Westlake Parties based upon changed needs. Owner shall use commercially reasonable efforts to make available such Demineralized Water when requested by the Westlake Parties; provided that Owner shall not be obligated to
make available Demineralized Water hereunder if doing so would have a material adverse effect on the operations of the Ethylene Assets. The Westlake Parties shall provide reasonable notice to Owner of the approximate date, time and quantity of each
of their requirements of Demineralized Water, 
 (subsections (a), (b), (c) and (d), collectively, the “Owner Provided
Services”). 
 5.3 Consultations. At the Westlake Parties’ request from time to time, Owner
shall consult with the Westlake Parties with respect to the performance of the Owner Provided Services and shall provide to the Westlake Parties such information as may be reasonably requested by the Westlake Parties regarding the performance of the
Owner Provided Services. Without limiting the generality of the foregoing, Owner and the Westlake Parties shall consult as frequently as reasonably necessary regarding the scope of Owner Provided Services and particular circumstances that may
require an adjustment to the scope of any Owner Provided Services, and shall keep each other timely informed about planned turnarounds, shutdowns, major technical projects, capital projects, significant operational events and other major events that
are relevant to the safe and efficient operation of the Ethylene Assets and the Westlake Facilities and the performance of the Parties’ respective obligations under this Agreement. 

5.4 Relationship of the Parties. At all times during the performance of the Owner Provided Services hereunder, all Persons
performing such Owner Provided Services (including agents, temporary employees, independent third parties and consultants) shall be construed as being independent from the Westlake Parties, and such Persons shall not be considered or deemed to be an
employee of the Westlake Parties or their Affiliates nor entitled to any employee benefits of the Westlake Parties or their Affiliates as a result of this Agreement. Notwithstanding anything to the contrary expressed or implied, this Agreement shall
not constitute or create any agency, joint venture, partnership or other fiduciary relationship or any fiduciary duty or fiduciary obligation, all of the same being hereby expressly disclaimed and waived. 

ARTICLE VI 

ADDITIONAL SERVICES 
 6.1
Additional Westlake Provided Services. If, subsequent to the date hereof, additional common facilities or services are required to operate the Westlake Facilities that are not listed on Schedule 3 or Schedule 4 the Westlake Parties
shall use commercially reasonable efforts to supply such additional facilities and services on mutually agreeable pricing and other terms to be determined on a basis similar to the pricing and other terms set forth in this Agreement, whereupon such
facility or service shall be considered part of the Common Facilities Services or Utility Services, as applicable. 
 6.2 Additional
Seconded Employees. If, subsequent to the date hereof, additional common facilities or services are required to operate the Ethylene Assets that are not listed on Schedule 5, the Westlake Parties shall use commercially reasonable efforts to
provide Seconded Employees to operate such additional facilities and services on mutually agreeable pricing and other terms to be determined on a basis similar to the pricing and other terms set forth in this Agreement, whereupon such facility or
service shall be considered part of the Operating Services. 
 6.3 Additional Westlake Provided Utilities. If, subsequent to
the date hereof, additional utilities are required to operate the Ethylene Assets that are not described in Article IV, the Westlake Parties shall use 

  
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commercially reasonable efforts to supply such additional utilities on mutually agreeable pricing and other terms to be determined on a basis similar to the pricing and other terms set forth in
this Agreement, whereupon such service shall be considered part of the Westlake Provided Utilities. 
 6.4 Additional Owner Provided
Services. If, subsequent to the date hereof, additional utilities or services are required to operate the Westlake Facilities that are not described in Article V or listed on Schedule 6, Owner shall use commercially reasonable efforts to
supply such additional utilities or services on mutually agreeable pricing and other terms to be determined on a basis similar to the pricing and other terms set forth in this Agreement, whereupon such service shall be considered part of the Owner
Provided Services. 
 ARTICLE VII  

AUTHORIZED PERSONS AND EMPLOYEES 

7.1 Delegation. 

(a) Subject to Section 3.2, Owner hereby delegates full authority to the Westlake Parties to take such actions as may be necessary or
appropriate in the Westlake Parties’ reasonable judgment for the performance of the Operating Services; 
 (b) Owner hereby delegates
full authority to the Westlake Parties to take such actions as may be necessary or appropriate in the Westlake Parties’ reasonable judgment for the performance of the Shared Services; 

(c) Owner hereby delegates full authority to the Westlake Parties to take such actions as may be necessary or appropriate in the Westlake
Parties’ reasonable judgment for the provision of the Westlake Provided Utilities; and 
 (d) The Westlake Parties hereby delegate full
authority to Owner to take such actions as may be necessary or appropriate in Owner’s reasonable judgment for the performance of the Owner Provided Services, 

which delegation of authority shall include the right to further delegate such authority to others. If any of the Services are delegated to and performed by
an Affiliate of a Party or an employee of a Party or an employee of any Affiliate of a Party, Section 9.1 shall apply thereto. 
 7.2
Personnel and Secondment.  
 (a) Pursuant to Section 3.1, the Westlake Parties shall provide, or cause to
be provided, to Owner the Seconded Employees (as defined in Section 7.2(b) below) and such other Persons (including consultants and professionals, service or other organizations)) as the Westlake Parties deem necessary or appropriate in order
to perform the Operating Services in an efficient and prudent manner. Subject to the Westlake Parties’ right to be reimbursed for such expenses in accordance with the Accounting Procedures, each Westlake Party shall pay all expenses incurred by
it in connection with the retention of the Seconded Employees and such other Persons, including, but not limited to, compensation, salaries, wages and overhead and administrative expenses, charges to or incurred by such Westlake Party, and, if
applicable, social security taxes, workers compensation insurance, retirement and insurance benefits and other such expenses. Any such Seconded Employees and other Persons retained by any Westlake Party may be union or non-union employees, and the
Westlake Parties shall have the sole right to negotiate the terms and provisions of any labor or other agreements with the unions to which such employees belong. The Westlake Parties shall provide, or cause to be provided, all workers who will
perform Services. 
 (b) During the term of this Agreement, the Westlake Parties shall, from time to time, designate certain of their
employees to be seconded to Owner to perform duties at the Owner’s assets or facilities or otherwise work on behalf of Owner in accordance with and subject to the terms of this Agreement. Each such employee who the Westlake Parties second to
Owner shall, during the time that such employee is seconded to Owner under this Agreement (the “Period of Secondment”), be referred to individually herein as a “Seconded Employee” and, collectively, as the
“Seconded Employees.” 

  
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 (c) The Westlake Parties will give notice to each Seconded Employee at times and in the normal
processes by which it gives similar notices to employees or otherwise in its discretion. The notices will include that (i) each such Seconded Employee will be a joint employee of the Westlake Parties and Owner, and (ii) for any work place
injury, the Seconded Employee’s sole remedy against either the Westlake Parties or Owner will be under the workers’ compensation insurance policy or qualified self-insured program of the Westlake Parties. For the avoidance of doubt, the
Parties acknowledge that the Seconded Employees will, during the Period of Secondment, be called upon to perform services for both Owner and the Westlake Parties of the same or closely-related nature. The Westlake Parties retain the right to
terminate the secondment of any Seconded Employee for any reason at any time or to hire or discharge the Seconded Employees with respect to their employment with the Westlake Parties. Owner will have the right to terminate the secondment to it of
any Seconded Employee for any reason at any time, upon prior written notice to the Westlake Parties, but at no time will Owner have the right to terminate any Seconded Employee’s employment by the Westlake Parties. Upon the termination of the
secondment of any Seconded Employee, such Seconded Employee will cease performing services for Owner. 
 (d) In the course and scope of
performing any Seconded Employee’s job functions for Owner, the Seconded Employee will report into Owner’s management structure, and will be under the direct management, supervision, direction and control of Owner with respect to such
Seconded Employee’s performance of the Operating Services and day-to-day activities. 
 (e) Those Seconded Employees who serve as
supervisors or managers and who are called upon to oversee the work of Seconded Employees working at Owner’s assets or facilities or to provide management support on behalf of Owner are designated by Owner as supervisors to act on the behalf of
Owner in supervising the Seconded Employees pursuant to Section 7.2(d) above. Any Seconded Employee so designated will be acting on the behalf of Owner when supervising the work of the Seconded Employees or when they are otherwise providing
management or executive support on behalf of Owner. 
 (f) With respect to Owner’s operations in Texas, the Westlake Parties shall
obtain workers’ compensation coverage as defined by Texas Labor Code Section 401.011(44) on behalf of both the Westlake Parties and Owner, and Owner shall be considered an employer solely for the purposes of Texas Labor Code
Section 401.011(18) and Section 408.001. With respect to the Owner’s operations in Kentucky, the Westlake Parties shall obtain workers’ compensation coverage as defined by Kentucky Revised Statute Section 342.340 on behalf
of both the Westlake Parties and Owner, and Owner shall be considered an employer solely for the purposes of Kentucky Revised Statute Section 342.630 and Section 342.690. With respect to the Owner’s operations in Louisiana, the
Westlake Parties shall obtain workers’ compensation coverage as defined by Louisiana Revised Statute Section 23:1168 on behalf of both the Westlake Parties and Owner, and Owner shall be considered an employer solely for the purposes of
Louisiana Revised Statute Section 23:1031 and Section 23:1032. With respect to Owner Group operations performed in any jurisdiction other than Texas, Kentucky, or Louisiana, the Westlake Parties shall obtain workers’ compensation
coverage as defined and required by Law on behalf of both the Westlake Parties and Owner, provided that Owner shall be considered an employer solely for the purposes of its status as a dual, joint- or co-employer under the relevant workers’
compensation regime. For the avoidance of doubt, nothing in this Agreement has any effect on the right of a Seconded Employee to prosecute a workers’ compensation claim against Owner, the Westlake Parties, or both. 

(g) Owner and the Westlake Parties acknowledge that the services provided for under this Agreement are an integral part of and essential to
the ability of Owner to generate the goods, products, and services of Owner, and to enable Owner to fulfill its business and commercial contracts, which are the core of its business. By executing this Agreement, Owner undertakes to execute work that
is part of its trade, business, and occupation. Owner and the Westlake Parties expressly recognize Owner as the statutory employer of the Seconded Employees for workers’ compensation purposes, whether those employees be direct employees or
statutory employees of the Westlake Parties. Notwithstanding anything in this Section 7.2(g), Owner remains the joint employer, with the Westlake Parties, of the Seconded Employees when under secondment, and should any conflict be found between
this Section 7.2(g) and Section 7.2(c), Section 7.2(c) shall predominate. 
 (h) Owner shall not be a participating employer
in any benefit plan of any Westlake Party. The Westlake Parties shall remain solely responsible for all obligations and liabilities arising with respect to any benefit plans relating to any Seconded Employees and Owner shall not assume any benefit
plan or have any obligations or liabilities arising thereunder, in each case except for costs properly chargeable to Owner. 

  
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 ARTICLE VIII 

BUDGETS, AUDITS AND ACCOUNTING 

8.1 Approved Annual Budgets. 

(a) Owner and the Westlake Parties acknowledge that they have agreed upon an Approved Annual Budget consistent with the Accounting Procedures
for the period commencing on the date of this Agreement and ending December 31, 2014 (the “First Approved Annual Budget”). 

(b) The Westlake Parties shall prepare and deliver to Owner, no later than 30 days before the commencement of each Fiscal Year, a proposed
budget for the Shared Services and the Operating Services to be performed by the Westlake Parties and the Seconded Employees, respectively, during such Fiscal Year. Each such budget shall be prepared on the same basis and using the same methodology
as the First Approved Annual Budget. Such budgets shall be prepared in sufficient detail to satisfy the reasonable requirements of Owner. However, at a minimum, such budgets shall include estimates of the labor expense and expenses incurred by
employees of the Westlake Parties or their Affiliates in performing the Shared Services and the Operating Services as well as an itemized list of estimated third Person expenses to be incurred in performing the Shared Services and the Operating
Services, in each case consistent with the Accounting Procedures. If requested by Owner, the Westlake Parties shall also prepare and deliver to Owner an explanation of any specific Expenditure. The Parties shall use good faith efforts to agree upon
an Approved Annual Budget reasonably acceptable to Owner no later than 15 days prior to the commencement of the Fiscal Year for which such budget applies. Owner shall have the right to reasonably comment on and make objections to each annual budget
proposed by the Westlake Parties, to the extent such comments and objections are with respect to the failure to prepare such budget on the same basis and using the same methodology as the First Annual Approved Budget; provided that if Owner and the
Westlake Parties fail to agree on such budget, the Westlake Parties’ budget shall provisionally constitute an Annual Approved Budget. If the Parties have not reached agreement on the annual budget within 30 days after Owner’s notice of
objection thereto, then senior management representatives of the Parties shall engage in negotiations, and if the Parties have not reached agreement within 30 days after commencement of negotiations, either Party shall have the right to resolve such
dispute in a court of law pursuant to this Agreement. If any such dispute is resolved in favor of Owner, the Westlake Parties shall reimburse Owner the amount of Expenditures determined not to be chargeable to the Westlake Parties, with interest as
provided in Section 10.1(c). As to each Approved Annual Budget, no later than the 15th day preceding the commencement of the second, third and fourth quarterly periods covered by such Approved Annual Budget, the Westlake Parties will provide to
Owner adjustments to such Approved Annual Budget to reflect the estimated Expenditures to be incurred in the performance of the Shared Services and the Operating Services over the balance of the Fiscal Year covered by such Approved Annual Budget.

 (c) It is acknowledged and agreed by the Parties that the annual budgeting process, the quarterly updates to such budgets, and the
revisions of such budgets pursuant to this Article VIII to cover overages are for planning purposes, and if the actual Expenditures incurred by the Westlake Parties in the performance of the Shared Services and the Operating Services exceed such
budgeted Expenditures, the Westlake Parties shall nevertheless be entitled to reimbursement of such actual Expenditures pursuant and subject to the terms of Article X. 

8.2 Unbudgeted Expenditures. The Westlake Parties shall notify Owner as soon as practicable of any occurrences or other
circumstances which the Westlake Parties have reason to believe may (a) cause any line item in the most recently Approved Annual Budget (as updated pursuant to Section 8.1) to be exceeded by the greater of (i) twenty percent (20%); or
(ii) 1 million US dollars or (b) cause the total amount of such Approved Annual Budget to be exceeded by the greater of (i) twenty percent (20%); or (ii) 1 million US dollars. If the Westlake Parties determine that
either clause (a) or (b) will likely occur, the Westlake Parties shall in the notice advising Owner describe the circumstances thereof in writing in such detail as may reasonably be necessary to provide an informed understanding of the
situation including a description of the category or categories of Expenditures involved, the reason for such projected overage, the necessary revisions to the Approved Annual Budget to cover such overage, and such further information as Owner may
reasonably request. Owner shall have the right, acting reasonably, to comment on and make objections to such revisions; provided that if Owner and the Westlake Parties fail to agree on such revisions, the Westlake Parties’ revisions shall
remain in place, subject to Owner’s right to resolve disputes in a court of law pursuant to this Agreement. 

  
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 8.3 Accounting, Reimbursement and Fee. 

(a) The Westlake Parties shall keep a full and complete account of all Expenditures incurred by them in connection with the performance of the
Shared Services and the Operating Services in the manner set forth in the Accounting Procedures, and shall otherwise keep a full and complete account of all accounts that Owner is required to maintain (except accounts required for Owner’s
investors), or that are otherwise contemplated, under this Agreement. 
 (b) The Westlake Parties shall be reimbursed by Owner for
Expenditures and Capital Expenditures incurred by the Westlake Parties in the performance of the Shared Services and the Operating Services, in accordance with the Accounting Procedures; provided, Owner shall not be required to reimburse the
Westlake Parties for (i) Expenditures arising out of claims for non-payment of any and all contributions, withholding deductions or taxes measured by the wages, salaries or compensation paid to Persons employed by the Westlake Parties or any of
their Affiliates in connection herewith or (ii) Expenditures for which the Westlake Parties are required to provide indemnification to Owner pursuant to Section 15.1. 

8.4 Reports. The Westlake Parties shall cause to be timely prepared and delivered to Owner such reports,
forecasts, implementation plans, plans of action, studies and other information pertaining to the performance of the Shared Services and the Operating Services as Owner may reasonably request from time to time. The costs incurred by the Westlake
Parties in preparing and delivering such reports, forecasts, plans, studies and other information shall be included in the Expenditures to be reimbursed by Owner pursuant to Sections 8.3(b). 

8.5 Audit and Examination. 

(a) To the extent necessary to verify the accuracy of any statement, invoice, charge or computation made under this Agreement, each Party
shall have the right, at its cost, to interview representatives of the other Party and to examine the books and records maintained by such other Party relating to this Agreement, including support for costs charged by the Party’s third party
contractors, relating to the performance of the relevant Services, during normal business hours and upon reasonable notice to the other Party; provided that each Party has the right to redact from the records subject to examination of any
portions thereof as necessary to comply with such Party’s confidentiality obligations. Such audit must be commenced within 12 Months of receiving said statement, invoice, charge or computation made under this Agreement and will take place at a
location mutually agreeable to the Parties. All records subject to audit hereunder shall be caused to be retained for no less than two calendar years after their creation. If any such examination establishes any inaccuracy in any billing made prior
to such examination, the necessary adjustments to such billings will be made promptly without any interest charge. 
 (b) Absent fraud or
intentional concealment or misrepresentation by the relevant Party, such Party shall neither be required nor permitted to adjust any Expenditure incurred by such Party during a Fiscal Year unless a claim therefor is presented or adjustment is
initiated within the 12 Months following such Fiscal Year, and in the absence of such timely claims or adjustments, the books and records rendered by the Westlake Parties shall be conclusively established as correct. If a Party has commenced an
audit within the period referenced in Section 8.5(a) but has been unable to complete the audit within such period despite its good faith efforts to do so, then such Party may request a reasonable extension of time to complete the audit and such
request will not be unreasonably denied by the other Party. 
 ARTICLE IX 

STANDARD OF CARE, NEGATIVE COVENANTS, CONFIDENTIAL INFORMATION AND PROPRIETARY INVENTIONS 

9.1 Standard of Care. In performing the Services, the Parties shall at all times act in accordance with the following:
(a) the requirements of this Agreement, (b) prudent operating and maintenance practices of the U.S. 

  
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chemical industry; (c) all Applicable Law including environmental standards in effect from time to time, and any other applicable rules and requirements of Governmental Authorities; and
(d) good faith and reasonable commercial standards; provided, in no event shall a Party be obligated to comply with a requirement if such compliance would result in a breach by that Party of Applicable Law. In addition, the Services to be
provided hereunder shall be performed generally in a good faith effort to be cost effective, and with the same general degree of care and at the same general degree of accuracy and responsiveness as when such Party performs services for itself at
the Westlake Facilities or the Ethylene Assets, as applicable. NOTWITHSTANDING ANY CONTRARY PROVISIONS OF THIS AGREEMENT OR APPLICABLE LAW, EXCEPT IN THE CASE OF ACTUAL FRAUD, THE PARTIES AND THEIR AFFILIATES (AND THEIR RESPECTIVE OWNERS,
EMPLOYEES, AGENTS AND CONTRACTORS) SHALL NOT HAVE ANY LIABILITY TO OWNER UNDER OR WITH RESPECT TO THIS AGREEMENT (WHETHER BASED ON CONTRACT, TORT, NEGLIGENCE (WHETHER SOLE OR CONCURRENT, STRICT LIABILITY OR OTHERWISE)) FOR LOSSES SUSTAINED OR
LIABILITIES INCURRED EXCEPT PURSUANT TO SECTION 15.1.  
 9.2 Negative Covenants. A Party shall not,
without the prior written consent of the other Party, do or, to the extent the same is within its reasonable control and consistent with the other terms of this Agreement, permit to occur or to continue, any of the following: 

(a) Commit the other Party to, or enter into on behalf of such other Party, any contract or agreement except in the ordinary course of
operating the Westlake Facilities or the Ethylene Assets, as applicable, unless the Party is authorized to do so by the other Party; 
 (b)
Create or incur any lien, security interest or encumbrance upon the Westlake Facilities or the Ethylene Assets, as applicable, including without limitation any mechanics or material men’s liens or similar encumbrances arising out of claims for
work, labor or materials furnished to the Party in connection with the provision of Services by that Party hereunder; 
 (c) Purport to
sell, lease, pledge, mortgage, assign, transfer or otherwise dispose of the Westlake Facilities or the Ethylene Assets, as applicable or any of the other Party’s now owned or hereafter acquired assets, except for replaced parts and other assets
that are taken out of service and are sold or otherwise disposed of in the ordinary course of operating the Westlake Facilities or the Ethylene Assets, as applicable; or 

(d) Commit the other Party to be or to become directly or contingently responsible or liable for obligations of any other Person, by
assumption, guarantee, endorsement or otherwise. 
 9.3 Proprietary Inventions and Techniques. Owner grants to
the Westlake Parties an irrevocable, royalty-free, non-exclusive and non-assignable license to use, during the Term of this Agreement, any proprietary inventions, processes and techniques of Owner which are necessary or useful in the operation of
the Common Facilities. As a condition precedent to the effectiveness of such license to use, the Westlake Parties hereby expressly agree that they will utilize such proprietary inventions, processes and techniques solely in connection with the
performance of its duties hereunder. Upon termination of this Agreement, such license shall terminate and the Westlake Parties shall return to Owner whatever possessory interest the Westlake Parties have in all inventions, processes or techniques
that are proprietary to Owner. 
 ARTICLE X 

PAYMENT OF COSTS 
 10.1
Payments. 
 (a) Each Party shall issue to the other Party an invoice on or before the 20th day of each Month (the “Monthly Invoice”) reflecting such other Party’s allocable share of Expenditures (split between Operating Expenses and Capital Expenditures)
incurred by the Party under this Agreement in the provision of Services for the prior Month (the “Relevant Month”). 

  
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 (b) Each Party shall pay the amount of each Monthly Invoice to the other Party, other than any
amount thereof that is disputed in accordance with Section 10.1(e) below, not later than the 5th day following receipt from such other Party of the Monthly Invoice. If the due date for
payment is not a Business Day, then the due date for payment shall be the immediately succeeding Business Day. Any adjustments necessary to reconcile the resolution of a disputed amount with the amount actually paid shall be paid within five Days
following resolution of the disputed amount. Any adjustments, whether for overpayment or underpayment, for disputed amounts shall bear interest at the Base Rate from the date of overpayment or underpayment, as the case may be, until the actual date
of payment. 
 (c) In the event that any amount reflected in any statement or invoice is not paid when due, other than any amount thereof
that is disputed in accordance with Section 10.1(e) below, such unpaid amount shall bear interest from and including the day following the due date therefor up to and including the date when payment is made, at the Default Rate. 

(d) If any Party fails to make payment of any amount of any Monthly Invoice, other than any amount thereof that is disputed in accordance with
Section 10.1(e) below, on or before the later of (i) the 60th day after such payment is due an (ii) the 30th day after notice to
such Party of non-payment, the other Party shall have the right to suspend the performance of the relevant Services hereunder to such Party until such payment is made. 

(e) A Party may withhold payment of all or any portion of any amount reflected as owing by the other Party in any statement or invoice
received from the other Party to the extent that the paying Party disputes payment of such amount or such portion thereof in good faith. For the avoidance of doubt, as to any Monthly Invoice, a Party may withhold payment as to any disputed amount,
including to account for any credit such Party believes it is owed with respect to the performance or receipt of Services, or the failure thereof. In the event of such a dispute, the disputing Party shall promptly notify the other Party, stating its
reasons for disputing such amount and, to the extent available providing reasonable supporting documentation therefor. 
 (f) A Party may
dispute a Monthly Invoice, or any portion thereof, by notice to the other Party, up to one calendar year following receipt of such Monthly Invoice, provided that if a Party fails to deliver such notification within such period, it shall be
deemed to have waived the right to dispute the applicable Monthly Invoice. 
 (g) All payments pursuant to this Section 10.1 shall be
calculated in accordance with the Accounting Principles and shall exclude any costs or expenses for which a Party is required to indemnify the other Party pursuant to Section 15.1. 

(h) Monthly Invoices shall take into account any prior payments made by a Party that have not been used by the Party providing services. Each
Monthly Invoice shall include a reconciliation (split between Operating Expenses and Capital Expenditures) of the Monthly Invoice payment made by the relevant Party for the Month and such Party’s allocable share of the actual Expenditures
incurred by the Party providing the services during such Month, and any amount owing by one Party to the other Party pursuant to such reconciliation shall adjust the amount otherwise payable on that Monthly Invoice. 

(i) All payments under this Agreement shall be made in United States dollars by wire transfer in immediately available funds by deposit to the
bank account designated in writing by the Party receiving the payment. Any wire transfer charges shall be for the account of the Party making the payment. If a Party elects to change the bank or account to which payments are to be made, that Party
shall notify the other Party before the effective date of such change. 
 10.2 Reimbursement for Emergencies.

 (a) If the Westlake Parties take any action pursuant to an Emergency involving or related to the Common Facilities or the Ethylene
Assets, the Westlake Parties shall be entitled to reimbursement for Owner’s allocable share of all Expenditures reasonably incurred in taking such action (subject to Section 10.2(c)). The Westlake Parties agree to promptly notify Owner of
any such Emergency, and to provide Owner with sufficient 

  
 19 

 
explanation and justification for any action taken in response thereto and the Expenditures incurred, or expected to be incurred, in connection therewith, any further action required, and such
other details as may be required for reporting to any Governmental Authority. Owner shall reimburse the Westlake Parties for Owner’s allocable share of Expenditures reasonably incurred under this Section 10.2 upon receipt of invoices, if
applicable, sent by the Westlake Parties in the ordinary course after the Expenditures have been incurred and Owner is notified thereof. 

(b) The Westlake Parties are hereby authorized to make immediate commitments or expenditures, without prior approval, as necessary to
accomplish the following: 
 (i) prevent imminent escape of gas, liquids, chemicals or vapors from the Common Facilities and/or the Ethylene
Assets; 
 (ii) prevent imminent injury to any Person arising out of the operation of the Common Facilities and/or the Ethylene Assets; 

(iii) prevent, curtail, minimize or otherwise mitigate imminent damage to the environment or the property of Owner, the Westlake Parties or
third parties arising out of the operation of the Common Facilities and/or the Ethylene Assets or from the performance of the Services; 

(iv) prevent imminent failure or unplanned shutdown of the Common Facilities, any Utility Service or the Ethylene Assets; 

(v) restore the Common Facilities, any Utility Service and the Ethylene Assets to operating condition following an unplanned shutdown or
failure; or 
 (vi) comply with emergency orders of any Governmental Authority arising out of the operation of the Common Facilities, the
Ethylene Assets or the performance of the Services. 
 (c) Notwithstanding anything to the contrary, the Westlake Parties shall not be
entitled to reimbursement for Expenditures made in accordance with this Section 10.2 if the circumstance giving rise to the Expenditure resulted from the Westlake Parties’ gross negligence or willful misconduct. 

(d) If an Emergency or other situation requiring prompt action arises and the Westlake Parties are not reasonably responding in a prompt
fashion, Owner shall have the right to take such remedial action as it deems appropriate, at Owner’s cost, and the Westlake Parties will reimburse Owner for the Westlake Parties’ allocable share of the costs incurred by Owner in connection
with such remedial action; provided, if the circumstance giving rise to such remedial action resulted from the Westlake Parties’ gross negligence or willful misconduct, then the cost of such remedial action shall be borne and paid by the
Westlake Parties. 
 ARTICLE XI 

TAXES 
 11.1 Embedded
Tax Amounts. If any portion of any payment made by a Party hereunder is to reimburse the other Party for any federal, state or local taxes or assessments, then such other Party shall cause such taxes and assessments to be paid
prior to delinquency. 
 11.2 Income Taxes. Notwithstanding anything to the contrary, Expenditures for which a
Party is entitled to reimbursement pursuant to this Agreement shall not include taxes that are measured or based on that Party’s income or franchise taxes or similar taxes, and all such income, franchise and similar taxes shall be the
responsibility of that Party. 

  
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 ARTICLE XII WARRANTY/CLAIMS 

12.1 Warranties. 

(a) The Westlake Parties shall use commercially reasonable efforts, as agent for Owner, to secure from vendors, suppliers and subcontractors,
for Owner’s benefit, such warranties and guarantees as may reasonably be available regarding supplies, materials, equipment and services purchased for the Ethylene Assets in the performance of the Operating Services, and to enforce such
warranties and guarantees on behalf of Owner. As regards any equipment, materials, supplies or services obtained by the Westlake Parties from vendors, suppliers and subcontractors, the only warranties, if any, applicable thereto and available to
Owner shall be those offered by such vendors, suppliers and subcontractors. THE WESTLAKE PARTIES MAKE NO EXPRESS OR IMPLIED WARRANTY, GUARANTY OR REPRESENTATION, INCLUDING ANY EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR PARTICULAR PURPOSE,
SUITABILITY OR MERCHANTABILITY, REGARDING THE DESIGN OR ANY OTHER CHARACTERISTICS OF THE ETHYLENE ASSETS OR ANY SUCH EQUIPMENT, MATERIALS, SUPPLIES OR SERVICE, ALL OF WHICH ARE SPECIFICALLY DISCLAIMED AND NEGATED. 

(b) OWNER’S EXCLUSIVE REMEDIES WITH RESPECT TO EQUIPMENT, MATERIALS, SUPPLIES OR SERVICES OBTAINED BY THE WESTLAKE PARTIES FROM THIRD
PARTY VENDORS, SUPPLIERS AND SUBCONTRACTORS SHALL BE THOSE UNDER THE VENDOR, SUPPLIER AND SUBCONTRACTOR WARRANTIES REFERENCED IN SECTION 12.1(a), AND THE WESTLAKE PARTIES’ ONLY OBLIGATION, ARISING OUT OF OR IN CONNECTION WITH ANY SUCH
WARRANTY OR BREACH THEREOF, SHALL BE TO USE COMMERCIALLY REASONABLE EFFORTS TO ENFORCE SUCH WARRANTIES AND OWNER SHALL HAVE NO OTHER REMEDIES AGAINST THE WESTLAKE PARTIES WITH RESPECT TO EQUIPMENT, MATERIALS, SUPPLIES OR SERVICES OBTAINED BY THE
WESTLAKE PARTIES FROM SUCH VENDORS, SUPPLIERS AND SUBCONTRACTORS. 
 12.2 Claims. Any and all claims against Owner instituted
by anyone other than the Westlake Parties arising out of the performance of the Operating Services that are not covered by insurance shall be settled or litigated and defended by the Westlake Parties except when (a) the amount involved is
stated to be (or estimated to be, as the case may be) greater than $1,000,000 or (b) criminal sanction is sought. The settlement or defense of any claim described in clause (a) or (b) above shall be decided by Owner in its sole and
absolute discretion following consultation with the Westlake Parties. Each Party shall provide written notice to the other Party as soon as practicable of any claims instituted against Owner or the Westlake Parties in their capacity as provider of
the Operating Services (regardless of the amount or nature of the claim). 
 ARTICLE XIII 

TERMINATION 
 13.1
Term. This Agreement shall commence as of the date of this Agreement and shall continue in effect until the 12th anniversary hereof (the “Initial
Term”) or, if earlier, the date upon which this Agreement is terminated pursuant to Section 13.2. Beginning at least one] year prior to the expiration of the Initial Term, the Parties will negotiate in good faith using commercially
reasonable efforts to reach agreement upon terms for the renewal of this Agreement (a “Renewal Term”; and the Initial Term together with any Renewal Term is the “Term” of this Agreement), along with
the terms for renewal of the Related Agreements. If the Parties have not reached agreement upon terms for the renewal of this Agreement and the Related Agreements by the date that is six months prior to the expiration of this Agreement, then senior
management representatives of the Parties (including at least one representative from each Party who has not previously been directly engaged in the prior renewal negotiations) shall engage in discussions regarding such renewal; provided, however,
that neither Party shall be obligated to renew this Agreement. 
 13.2 Termination. The following provisions
shall govern the termination of this Agreement. Any termination pursuant to this Section 13.2 shall be evidenced by a notice given by the Party effectuating such termination. 

  
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 (a) Owner shall have the option to terminate this Agreement if: 

(i) the Westlake Parties materially default in the performance of their obligations under this Agreement and (1) such material default
continues for a period of 30 days after notice thereof by Owner to the Westlake Parties or (2) if the default is not reasonably susceptible of being cured within a 30 day period, the Westlake Parties fail to commence the cure of said default
within a 30 day period or thereafter fails to pursue the cure with commercially reasonable diligence; or 
 (ii) the annual fees payable by
Owner in respect of Services exceed such amount given in the Agreed Annual Budget for the relevant Fiscal Year by the greater of (i) 20 %; or (ii) 1 million US dollars, without the prior written consent of Owner; and 

(b) The Westlake Parties shall have the option to terminate this Agreement if: 

(i) Owner materially defaults in the performance of its obligations under this Agreement and (i) such material default continues for a
period of 30 days after notice thereof by the Westlake Parties to Owner or (ii) if the default is not reasonably susceptible of being cured within a 30 day period, Owner fails to commence the cure of said default within a 30 day period or
thereafter fails to pursue the cure with commercially reasonable diligence; 
 (ii) Owner becomes subject to a Bankruptcy Proceeding; 

(iii) Owner permanently shuts down the Ethylene Assets; or 

(iv) Owner has not operated the Ethylene Assets for a period of more than six consecutive months for any reason other than for
(A) construction following a casualty loss, which construction is being performed in compliance with section 7.3 of each of the Site Lease Agreements or (B) Force Majeure. 

(c) A Party shall have the option to terminate this Agreement in the case of a Force Majeure Event which is continuing for at least 12 months
after receipt by the other Party of notice pursuant to Section 16.2. 
 (d) This Agreement shall automatically terminate if the
Ethylene Sales Agreement terminates pursuant to the provisions therein. 
 13.3 Self Help. During any period
that a Party (a) is unable pursuant to Article XVI or (b) has failed to perform any Service after receipt of notice from the other Party regarding such failure, to perform any of the Services (the “Subject
Services”), the other Party shall have the right to perform or cause to be performed the Subject Services, and the first Party shall take all actions reasonably necessary to facilitate such performance of the Subject Services. 

13.4 General Obligations. As reasonably requested by a Party during the 180 day period following the termination
of this Agreement, the other Party shall provide Services pursuant to the terms of this Agreement (and for which the requesting Party shall continue to advance or reimburse Expenditures as set forth in Article X) and otherwise reasonably cooperate
with Owner, provided that Owner is not in payment default at any time during such period. 
 ARTICLE XIV 

ACCESS TO ETHYLENE ASSETS 

The Westlake Parties, their agents and contractors and the Seconded Employees shall at all times during their performance of the Westlake
Provided Services hereunder have full and free, non-exclusive access to the Ethylene Assets as necessary to perform their obligations under this Agreement, and all such Persons shall comply with all safety and other procedures from time to time
imposed by Owner or the Westlake Parties in connection with any access to or work performed on or about the Ethylene Assets or the Westlake Facilities. Owner shall reasonably cooperate with the Westlake Parties in connection with the Westlake
Parties’ performance of their obligations under 

  
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this Agreement, including (a) signing, submitting and prosecuting applications or submissions for Permits with respect to the Ethylene Assets for which Owner is a necessary and indispensable
party and taking such other action reasonably required of Owner to enable the Westlake Parties to perform their obligations under this Agreement including, obtaining and maintaining applicable Permits; (b) granting the Westlake Parties and
their representatives and agents such, non-exclusive access to the Ethylene Assets and information to the extent known by Owner about historic, current and projected operations as may be reasonably needed by the Westlake Parties in order to fulfill
their obligations under this Agreement; and (c) granting the Westlake Parties and their representatives and agents the right to undertake all sampling, testing and monitoring required by any Permit or Governmental Authority in connection with
any Permit. Owner shall notify the Westlake Parties promptly of any written notification that it receives by Owner of any investigation, proceeding or other action commenced by any Governmental Authority relating to any Ethylene Asset Permit or any
Applicable Law relating to the Ethylene Assets. Owner shall promptly provide the Westlake Parties with copies of any and all written notices or other communications received by Owner from any Governmental Authority with respect to the Ethylene
Assets and, at the reasonable request of the Westlake Parties, any other information or document that is within Owner’s possession relating to such Ethylene Assets Permits or any obligations thereunder. 

ARTICLE XV 

INDEMNIFICATION 
 15.1
By the Westlake Parties. The Westlake Parties shall indemnify, protect and defend Owner and its Affiliates and all of their officers, directors, employees and agents (the “Owner Indemnified
Parties”) against, and hold the Owner Indemnified Parties harmless from, any and against all losses (including lost profits), costs, damages, injuries, taxes, penalties, interests, expenses, obligations, claims and liabilities (joint or
severable) of any kind or nature whatsoever (collectively, “Claims”) that are incurred by such Owner Indemnified Parties in connection with, relating to or arising out of (a) the breach by any Westlake Party, the
Westlake Parties’ Affiliates, or their directors, officers, employees, agents, contractors, subcontractors or consultants (the “Westlake Group”) of any term or condition of this Agreement, or (b) the performance of
any Services hereunder; provided, however, that the Westlake Parties shall not be obligated to indemnify, reimburse, defend or hold harmless any Owner Indemnified Party for any Claims incurred by such Owner Indemnified Party in connection
with, relating to or arising out of (i) a breach by such Owner Indemnified Party of this Agreement, (ii) the gross negligence, willful misconduct, bad faith or reckless disregard of such Owner Indemnified Party with respect to the Services
hereunder or (iii) the fraudulent or dishonest acts of such Owner Indemnified Party. 
 15.2 By Owner.
Owner shall indemnify, protect and defend the Westlake Parties and their Affiliates and all of their officers, directors, employees and agents (the “Westlake Indemnified Parties”) against, and hold the Westlake Indemnified
Parties harmless from, any and against all Claims that are incurred by such Westlake Indemnified Parties in connection with, relating to or arising out of (a) the breach by Owner, Owner’s Affiliates, or its directors, officers, employees,
agents, contractors, subcontractors or consultants (the “Owner Group”) of any term or condition of this Agreement, or (b) the performance of any Services hereunder; provided, however, that Owner shall not be
obligated to indemnify, reimburse, defend or hold harmless any Westlake Indemnified Party for any Claims incurred by such Westlake Indemnified Party in connection with, relating to or arising out of (i) a breach by such Westlake Indemnified
Party of this Agreement, (ii) the gross negligence, willful misconduct, bad faith or reckless disregard of such Westlake Indemnified Party with respect to the Services hereunder or (iii) the fraudulent or dishonest acts of such Westlake
Indemnified Party. 
 15.3 Indemnification Procedures. 

(a) A Party (the “Indemnified Party”) agrees that promptly after it becomes aware of facts giving rise to a Claim
under this Article XV, it will provide notice thereof to the other Party pursuant to Section 15.1 or Section 15.2 (the “Indemnifying Party”), specifying the nature of and specific basis for such claim, copies of all
correspondence with third parties, Governmental Authorities or other individuals relating to the claim, and other relevant information reasonably requested by the Indemnifying Party. 

(b) The Indemnifying Party shall have the right to control all aspects of the response to and/or defense of (and any counterclaims with
respect to) any claims brought against the Indemnified Party that are covered by the indemnification under this Article XV, including correspondence and negotiation with Governmental Authorities, 

  
 23 

 
the selection of counsel and engineering and other consultants, determination of the scope of and approach to any investigation or remediation, determination of whether to appeal any decision of
any court, determination of whether to enter into any voluntary agreement with any Governmental Authority, 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 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 under this Article XV, including the prompt furnishing to the Indemnifying Party of any correspondence or other notice relating thereto that the Indemnified Party may receive, permitting the name 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 15.3. 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 XV; provided, however, that 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 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) In determining the amount of any loss, cost, damage or expense for which the Indemnified Party is entitled to indemnification under this
Agreement, the gross amount of the indemnification will be reduced by (i) any insurance proceeds realized by the Indemnified Party, and such correlative insurance benefit shall be net of any incremental insurance premiums that become due and
payable by the Indemnified Party as a result of such claim and (ii) all amounts recovered by the Indemnified Party under contractual indemnities from third Persons. 

ARTICLE XVI 
 FORCE
MAJEURE 
 16.1 Force Majeure Event. Subject to the following provisions of this Article XVI, a Party shall
not be in default hereunder or responsible for any loss or damage to the other Party resulting from any delay in performing or failure to perform any obligation of such Party under this Agreement (other than a Party’s failure or delay to make
advances and payments for the provision of Services performed or to be performed) to the extent such failure or delay is caused by a Force Majeure Event. For clarification purposes, a Party shall not be obligated to make advances or payments for
Services that are not performed as a result of a Force Majeure Event. 
 16.2 Force Majeure Notice. The Party
whose ability to perform is affected by a Force Majeure Event must, as a condition to its right to suspend its obligations under Section 16.1, promptly give the other Party notice setting forth the particulars of the Force Majeure Event and, to
the extent possible, the expected duration of the Force Majeure Event and the Services to be affected by the Force Majeure Event. Such notice shall also include a description of the steps taken and proposed to be taken to lessen and cure the Force
Majeure Event. The cause of the Force Majeure Event shall so far as commercially reasonable be remedied with all reasonable dispatch, except that no Party shall be obligated to resolve any Labor Difficulties other than as it shall determine to be in
its best interests. 
 ARTICLE XVII 

OTHER PROVISIONS 
 17.1
Assignment. Except as permitted pursuant to the Omnibus Agreement, neither Party may assign or otherwise transfer any of its rights or obligations under this Agreement without the prior written consent of the other
Parties hereto, and any purported assignment or transfer in violation hereof shall be null and void. This Agreement shall be binding upon, and inure the benefit of, permitted successors and assigns. 

  
 24 

 17.2 Notices. All notices or requests or consents provided for by, or permitted to
be given pursuant to, this Agreement must be in writing and must be given by depositing same in the United States mail, addressed to the Person to be notified, postpaid, and registered or certified with return receipt requested or by delivering such
notice in person or by facsimile or e-mail to such Party. Notice given by personal delivery or mail shall be effective upon actual receipt. Notice given by facsimile or e-mail shall be effective upon actual receipt if received during the
recipient’s normal business hours or at the beginning of the recipient’s next Business Day after receipt if not received during the recipient’s normal business hours. All notices to be sent to a Party pursuant to this Agreement shall
be sent to or made at the address set forth below such Party’s signature to this Agreement or at such other address as such Party may stipulate to the other Parties in the manner provided in this Section 17.2. 

Owner: 
 Westlake Chemical OpCo,
LP 
 c/o Westlake Chemical Partners LP 

2801 Post Oak Boulevard, Suite 600 

Houston, Texas 77056 
 Attention:
Lawrence Teel, Principal Operating Officer 
 Fax: 713.960.8761 

The Westlake Parties: 
 Westlake
Management Services, Inc. 
 2801 Post Oak Boulevard, Suite 600 

Houston, Texas 77056 
 Attention:
David Hansen, Senior Vice President 
 Fax: 713.960.8738 

Westlake Vinyls, Inc. 
 c/o
Westlake Chemical Corporation 
 2801 Post Oak Boulevard, Suite 600 

Houston, Texas 77056 
 Attention:
Robert Buesinger, Senior Vice President 
 Fax: 713.963.1578 

WPT LLC 
 c/o Westlake Chemical
Corporation 
 2801 Post Oak Boulevard, Suite 600 

Houston, Texas 77056 
 Attention:
Amy Moore, Manager, Olefins 
 Fax: 713.960.8761 

Westlake Petrochemicals LLC 
 c/o
Westlake Chemical Corporation 
 2801 Post Oak Boulevard, Suite 600 

Houston, Texas 77056 
 Attention:
Todd Root, Director, 
 Planning & Business Developments, Olefins 

Fax: 713.960.8761 
 17.3
Severability. If any provision of this Agreement shall be finally determined to be unenforceable, illegal or unlawful, such provision shall, so long as the economic and legal substance of the transactions contemplated hereby is not
affected in any materially adverse manner as to any Party, be deemed severed from this Agreement and the remainder of this Agreement shall remain in full force and effect. 

  
 25 

 17.4 Entire Agreement. This Agreement and the Related Agreements (including any
exhibits hereto or thereto) constitute the entire agreement of the Parties relating to the matters contained herein and therein, superseding all prior contracts or agreements, whether oral or written, relating to the matters contained herein and
therein. 
 17.5 Amendment or Modification. This Agreement may be amended or modified from time to time only by the written
agreement of all the Parties hereto; provided, that the Owner may not, without the prior approval of the Conflicts Committee, agree to any amendment or modification of this Agreement that, in the reasonable judgment of the GP, will adversely affect
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. 

17.6 No Waiver. Failure of either Owner or the Westlake Parties to require performance of any provision of this
Agreement shall not affect either Party’s right to full performance thereof at any time thereafter, and the waiver by either Owner or the Westlake Parties of a breach of any provision hereof shall not constitute a waiver of any similar breach
in the future or of any other breach or nullify the effectiveness of such provision. 
 17.7 Safety Regulations.
All employees of each Party when on the property of the other Party will conform to the rules, regulations and procedures concerning safety of such other Party. From time to time, each Party shall furnish the other Party with complete, accurate and
current copies of all such rules, regulations and procedures. 
 17.8 Relationship of Parties. This Agreement
does not create a partnership, joint venture, or relationship of trust or agency between the Parties. 
 17.9 Governing Law.
This Agreement shall be subject to and governed by the laws of the State of Texas, excluding any conflicts-of-law rule or principle that might refer the construction or interpretation of this Agreement to the laws of another state. Each of the
Parties hereby agrees: (i) to submit to the exclusive jurisdiction of any state or federal court sitting in Houston, Texas in any action or proceeding arising out of or relating to this Agreement or the transactions contemplated hereby,
(ii) that all claims in respect of any such action or proceeding may be heard and determined in any such court, (iii) that such Party will not bring any action or proceeding arising out of or relating to this Agreement in any other court,
and (iv) that such Party waives any defense of inconvenient forum to the maintenance of any such action or proceeding, and waives any bond, surety or other security that might be required of any other Party with respect to any such action or
proceeding. 
 17.10 Dispute Resolution. 

(a) The dispute resolution provisions set forth in this Section 17.10 shall be the final, binding and exclusive means to resolve all
disputes, controversies or claims (each, a “Dispute”) arising under the Agreement, and each Party irrevocably waives any right to any trial by jury with respect to any dispute arising under this Agreement. 

(b) If a dispute arises, the following procedures shall be implemented: 

(i) Any Party may at any time invoke the dispute resolution procedures set forth in this Section 17.10 as to any dispute by providing
written notice of such action to the other Parties. 
 (ii) Notwithstanding the existence of any dispute or the pendency of any procedures
pursuant to this Section 17.10, and subject to Section 17.3, the Parties agree and undertake that all payments not in dispute shall continue to be made and that all obligations not in dispute shall continue to be performed. 

(iii) Within 30 days after receipt of notice of a dispute, representatives of the Parties shall engage in non-binding mediation, and a
specific timetable and completion date for its implementation shall also be agreed upon. If the completion date therefor shall occur without the Parties having resolved the dispute, then the Parties shall proceed under subsection (b)(iv). 

  
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 (iv) If, after satisfying the requirement above, the dispute is not resolved, the Parties shall
resolve the dispute by a binding arbitration, to be held in the State of Texas pursuant to the Federal Arbitration Act and in accordance with the then-prevailing Commercial Arbitration Rules of the American Arbitration Association (the
“AAA”). The AAA shall select one (1) arbitrator. Each Party shall bear its own expenses incurred in connection with arbitration and the fees and expenses of the arbitrator shall be shared equally by the Parties
involved in the dispute and advanced by them from time to time as require. It is the mutual intention and desire of the Parties that the arbitrator be selected as expeditiously as possible following the submission of the dispute to
arbitration. Once the arbitrator is selected and except as may otherwise be agreed in writing by the Parties involved in such dispute or as ordered by the arbitrator upon substantial justification shown, the hearing for the dispute will be held
within sixty (60) days of submission of the dispute to arbitration. The arbitrator shall render his final award within sixty (60) days, subject to extension by the arbitrator upon substantial justification shown of extraordinary
circumstances, following conclusion of the hearing and any required post-hearing briefing or other proceedings ordered by the arbitrator. Any discovery in connection with arbitration hereunder shall be
limited to information directly relevant to the controversy or claim in arbitration. The decision of the arbitrator in any such proceeding will be reasoned, final and binding and final judgment may be entered upon such an award in any court of
competent jurisdiction, but entry of such judgment will not be required to make such award effective. Any action against any Party ancillary to arbitration (as determined by the arbitrators), including any action for provisional or conservatory
measures or action to enforce an arbitration award or any judgment entered by any court in respect of any thereof may be brought in any federal or state court of competent jurisdiction located within the State of Texas, and the Parties hereby
irrevocably submit to the non-exclusive jurisdiction of any federal or state court located within the State of Texas over any such action. The Parties hereby irrevocably waive, to the fullest extent
permitted by Law, any objection which they may now or hereafter have to the laying of venue of any such action brought in such court or any defense of inconvenient forum for the maintenance of such action. Each of the Parties agrees that a
judgment in any such action may be enforced in other jurisdictions by suit on the judgment or in any other manner provided by law.
 17.11
Waiver of Consequential Damages. NOTWITHSTANDING ANY OTHER PROVISION OF THIS AGREEMENT, NO PARTY SHALL BE LIABLE TO THE OTHER PARTY FOR OR IN RESPECT OF ANY CONSEQUENTIAL LOSS OR DAMAGE, SPECIAL OR PUNITIVE DAMAGES OR
LOSS OF PROFITS OR BUSINESS INTERRUPTION, SUFFERED OR INCURRED BY ANY OTHER PARTY ARISING OUT OF, IN CONNECTION WITH, OR RESULTING FROM, THIS AGREEMENT, WHETHER ANY CLAIM FOR SUCH LOSS OR DAMAGE IS BASED ON TORT (INCLUDING NEGLIGENCE), STRICT
LIABILITY, CONTRACT (INCLUDING BREACH OF OR FAILURE TO PERFORM THIS AGREEMENT OR THE BREACH OF ANY REPRESENTATION OR WARRANTY HEREUNDER, WHETHER EXPRESS OR IMPLIED) OR OTHERWISE, EXCEPT FOR ANY SUCH DAMAGES RECOVERED BY ANY THIRD PARTY AGAINST ANY
PARTY IN RESPECT OF WHICH SUCH PARTY WOULD OTHERWISE BE ENTITLED TO INDEMNIFICATION PURSUANT TO ARTICLE XV, PROVIDED THAT NO PARTY SHALL BE ENTITLED TO INDEMNIFICATION FOR ANY DAMAGES THAT ARE CONTRARY TO APPLICABLE LAW. 

17.12 Further Assurances. In connection with this Agreement and all transactions contemplated by this Agreement, each signatory
party hereto agrees to execute and deliver such additional documents and instruments and to perform such additional acts as may be necessary or appropriate to effectuate, carry out and perform all of the terms, provisions and conditions of this
Agreement and all such transactions. 
 17.13 Set Off. Each Party has the right to set off against any amounts
due to the other Party hereunder any and all amounts that the other Party owes to the first Party under this Agreement or the Related Agreements. 

17.14 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. 

17.15 Rights of Third Parties. The provisions of this Agreement are enforceable solely by the
Parties to this Agreement, and no third party (including any Limited Partner of the MLP) shall have the right, separate and apart from the Parties to this Agreement, to enforce any provision of this Agreement or to compel any Party to this Agreement
to comply with the terms of this Agreement. 

  
 27 

 [Signatures on following page] 

  
 28 

 IN WITNESS WHEREOF, the Parties have executed this Agreement as of the date first set forth
above. 
  

			
	WESTLAKE CHEMICAL OPCO LP
		
	By:	 	Westlake Chemical OpCo GP LLC, its general partner
		
	By:	 	/s/ Lawrence E. Teel
	Name:	 	Lawrence E. Teel
	Title:	 	Principal Operating Officer
	
	WESTLAKE MANAGEMENT SERVICES, INC.
		
	By:	 	/s/ Albert Chao
	Name:	 	Albert Chao
	Title:	 	President and Secretary
	
	WESTLAKE VINYLS, INC.
		
	By:	 	/s/ Albert Chao
	Name:	 	Albert Chao
	Title:	 	President and Secretary
	
	WPT LLC
		
	By:	 	Westlake Chemical Investments, Inc., its manager
		
	By:	 	/s/ Albert Chao
	Name:	 	Albert Chao
	Title:	 	President and Secretary
	
	WESTLAKE PETROCHEMICALS LLC
		
	By:	 	Westlake Chemical Investments, Inc., its manager
		
	By:	 	/s/ Albert Chao
	Name:	 	Albert Chao
	Title:	 	President and Secretary

 Signature Page to Services and Secondment Agreement 

 SCHEDULE 1 

ETHYLENE ASSETS 

PART A 
 CALVERT
CITY ASSETS 
 The ethylene plant was built in 1963 and occupies approximately 13 acres. The original unit was designed and built by C. F. Braun. The
unit was converted to ethane feedstock and expanded to an annual capacity of 630 million pounds in early 2014. 
 PART B

 LAKE CHARLES ASSETS 
  

	1.	Petro 1 was started up in 1991 and occupies 26.99 acres. It was built with KBR technology as an ethane cracker and is now being expanded with Technip technology to 1.5B lb/yr of ethylene. 

 

	2.	Petro 2 was started up in 1997 and occupies 23.43 acres. It was built by Lummus as an ethane and propane cracker. It was expanded in 2013 to 1.49B lb/yr of ethylene by Lummus and will achieve that capacity with the
start-up of the seventh furnace at the end of 2014. 

  

	3.	As part of the Petro 2 project in 1997, the co-products storage and shipping area was built. The co-products storage area occupies 7.75 acres. 

 

	4.	The Lake Charles Assets comprise 58.17 acres in total. 

  
 Schedule 1 

 SCHEDULE 2 

COMMON FACILITIES 
  

	1.	Lake Charles Common Facilities 

  

	  	The Petro Site has 320 acres and has Petro 1, Petro 2, Co-products, Styrene and Poly 3. As noted Petro 1, Petro 2 and Co-products are owned by Owner and have 58.17 acres. To the west of the Petro Site, Westlake Chemical
owns about 350 acres of land for future development. 

  

	2.	Calvert City Common Facilities: 

  

	 	i.	The Chlor Alkali plant was built in 1966 and occupies approximately 40 acres. It was upgraded and expanded to 275K ECU capacity in 2001 utilizing Asahi Kasei membrane technology. The feedstocks are rock salt and
electricity. 

  

	 	ii.	The VCM unit was built in 1953 utilizing B. F. Goodrich technology. The unit occupies approximately 55 acres and has an annual production capacity of 1.3 billion pounds of VCM. The feedstocks are Chlorine, Ethylene and
Oxygen as well as supplemental Ethylene Dichloride as required. 

  

	 	iii.	The PVC unit was built in 1959 and occupies approximately 26 acres. It has a current annual production capacity of 1.4 billion pounds. The unit’s feedstock is VCM produced by the Westlake VCM unit.

  

	3.	Common Facilities which are owned by Westlake Parties and their Affiliates that Owner may use, and will be charged through Shared Services, will include, but shall not be limited to: 

 

	 	i.	Parking lots 

  

	 	ii.	Security 

  

	 	iii.	Internal roads 

  

	 	iv.	Walk ways 

  

	 	v.	Maintenance buildings 

  

	 	vi.	Warehouses 

  

	 	vii.	Engineering buildings 

  

	 	viii.	Office buildings 

  

	 	ix.	Lay down areas 

  

	 	x.	Rail tracks and loading and unloading 

  

	 	xi.	Truck loading and unloading 

  

	 	xii.	Raw water supply system 

  

	 	xiii.	Power supply system 

  

	 	xiv.	Feedstock supply system 

  

	 	xv.	Product outlet 

  
 Schedule 2 

	 	xvi.	Co-product handling 

  

	 	xvii.	Waste water line 

  

	 	xviii.	Firewater 

  

	 	xix.	Fire equipment in emergencies 

  
 Schedule 2 

 SCHEDULE 3 

COMMON FACILITIES SERVICES 

Plant Services 
 Maintenance – direct labor
and direct supervision for routine maintenance and construction 
 Warehouse – routine supplies and critical spare parts 

Laboratory 
 Plant safety –includes safety training and
maintaining safety equipment 
 Site Security – includes manning front gate (contract) 

Emergency Response – includes fire brigade, rescue and hazmat teams 

Railroad Services – loading rack and dock services, including direct labor and direct supervision 

Wastewater Treatment – includes sewer system 
 Cooling
Tower 
 Purchasing of and arranging for feedstock, services and supplies, including risk management and insurance thereto. 

Technical Services 
 Direct Process Engineering

 Process Safety Management 
 Environmental 

Process and Quality Control 
 Project Engineering 

IT 
 Other Services 

Marketing, accounting, human resources 
 Buildings and Grounds:
HVAC, janitorial, lawn care, weed control, trash, sprinkler system, roads, fencing, lighting, medical services and uniform 
 Buildings and Grounds include
Maintenance Shop, Warehouse and associated storage buildings, Central Control Room, Main Office, Security Building, Fire House, Motor Control Centers, Boilerhouse, Chemical Storage unit 

Training 
 Miscellaneous: phones, faxes, copiers, printers, mail
services, office supplies 

  
 Schedule 3 

 SCHEDULE 4 

UTILITY SERVICES 
 Utility
Services 
 Electric Power 
 Natural Gas 

Nitrogen 
 Fuel Gas 

Steam and process steam 
 Cooling water 

Potable water 
 Boiler feed water, service and soft water 

Raw water (from Sabine Diversion) 
 Instrument/Utility air 

  
 Schedule 4 

 SCHEDULE 5 

OPERATING SERVICES 
 The services
shall include the personnel, supplies, parts and materials necessary for the provision of comprehensive Operating Services. The Westlake Parties shall provide or cause to be provided the following Operating Services in connection with the operation
and maintenance of the Ethylene Assets, all in accordance with, and subject to, the requirements of this Agreement, including the following services by the Westlake Parties: 
  

	 	1.	provide, or procure and manage, those services (including operation, maintenance, engineering and construction services) necessary for the operation of the Ethylene Assets and to maintain the Ethylene Assets in sound
operating condition and good repair; 

  

	 	2.	perform routine maintenance, preventative maintenance and capitalized repairs; 

  

	 	3.	perform corrosion and inspection services, 

  

	 	4.	submit the applications for, pursue the issuance of, and maintain in force, the environmental and all other permits necessary for the operation of the Ethylene Assets; 

 

	 	5.	prepare, sign and file, or cause to be prepared, signed and filed, all filings required to be filed by an operator of comparable manufacturing facilities with any Governmental Authority with respect to the Ethylene
Assets or the operation thereof; 

  

	 	6.	pay any existing or future ad valorem tax, and any existing or future sales tax, use tax, value added tax, environmental tax or other governmental charge or tax (other than taxes measured by income) levied or imposed on
the Westlake Parties with respect to the Operating Services and prepare, deliver and maintain the required reports, valuations and statements with respect to such charges and taxes; 

 

	 	7.	provide, or procure and manage, any raw materials, catalysts, additives, process chemicals and other supplies required for the operation of the Ethylene Assets; 

 

	 	8.	operate the Ethylene Assets for the production of ethylene and certain ethylene co-products, including, but not limited to propylene, butadiene, pygas, pyoil and hydrogen (“Products”);

  

	 	9.	use, store, handle, treat and, on Owner’s behalf and in Owner’s name, dispose of, in accordance with Applicable Law, the hazardous waste and other hazardous materials and nonhazardous waste made, used,
processed, stored or generated in the operation of the Ethylene Assets; 

  

	 	10.	maintain proper inventory control and counting procedures and read, maintain and calibrate metering devices and maintain proper records in respect of the Products and other raw materials, catalysts, process chemicals,
supplies and fuel used in the operation of the Ethylene Assets; 

  

	 	11.	transport and store Products, including through exchange transactions; 

  

	 	12.	sell and distribute the Products to third-parties; 

  

	 	13.	prepare and maintain accounting, statistical, production runs and other operational reports, special reports detailing any accident or other significant event and such other reports and records as are required by
Applicable Law or as are customarily maintained by prudent operators for facilities similar to the Ethylene Assets, including, as applicable, the following information: 

 

	 	i.	intakes and outturns of the Ethylene Assets; 

  

	 	ii.	production of Products; 

  

	 	iii.	maintenance of the Ethylene Assets, including turnarounds; 

  

	 	iv.	scheduled and unscheduled shutdowns and other events reducing available time, space or other available use of the Ethylene Assets; 

  
 Schedule 5 

	 	v.	inventory feedstock, Product and other raw materials, catalysts, additives, process chemicals and other supplies and fuel; 

  

	 	vi.	permit violations; and 

  

	 	vii.	NOVs/NODs, and environmental releases or spills requiring the preparation, maintenance or submission of reports or records under any Environmental Laws or such other policy as Owner may specify in advance in writing or
any other event materially affecting the environment, health and/or safety; 

  

	 	14.	propose such capital projects to the Ethylene Assets as it may consider necessary or useful and provide, or procure the provision of, project assistance for capital projects to the Ethylene Assets as requested by Owner,
including the development of project scope, plans, cost estimates, performance targets and other relevant information for capital projects that the Owner may reasonably request; 

 

	 	15.	provide, or procure and manage, engineering, technical services, construction and installation work to the Ethylene Assets, including for capital projects; 

 

	 	16.	prepare and maintain periodic reviews and updates of facilities procedures manuals and other documentation and of appropriate rules, regulations, procedures and manuals for the protection of the environment, health
and/or safety as required by Applicable Law and as would be customarily prepared and maintained by a prudent operator for facilities similar to the Ethylene Assets; 

 

	 	17.	take such reasonable actions as to cause the warranties and guaranties from vendors, operators and contractors required by applicable contract or design specifications to be delivered and maintained; 

 

	 	18.	maintain such quality certifications with respect to the Ethylene Assets as is necessary for the production of Products. In addition, if Owner shall require a quality certification for the Ethylene Assets to satisfy the
requirements of a customer of any end use products, the Westlake Parties shall obtain and maintain such certification provided that to do so does not place excessive administrative or other burdens on the Westlake Parties and Owner pays all
incremental costs of obtaining and maintaining such quality certification; and 

  

	 	19.	perform laboratory testing procedures for the Ethylene Assets products required for process and quality control and to maintain compliance with specifications. 

In the event that, subsequent to the date hereof, additional services are required to operate the Ethylene Assets that are not listed on this Schedule 5, the
Westlake Parties shall use commercially reasonable efforts to supply such additional services on a mutually agreeable pricing and other terms, whereupon such services shall be considered to be an Operating Service for purposes of this Agreement.

  
 Schedule 5 

 SCHEDULE 6 

OWNER PROVIDED SERVICES 
 Purge
Gas Processing 
 At the Lake Charles Assets the Poly 1/2 units send ethylene purge gas from their process to maintain the quality of the polyethylene
product. This purge gas is returned to Petro 1 or Petro 2 and reprocessed, as it is largely ethylene. 
 A reprocessing charge that covers the cost of
energy, chemicals, etc. is made. This cost is to be mutually agreed between the parties from time to time, based upon to cost of energy, chemicals, etc. pursuant to the mutual agreement of the Parties. 

High Pressure Steam 
 At the Lake Charles Assets, in
order to support the Petro 1 and Styrene plants, there is a line between them to allow the transfer of 600 psig superheated steam from one plant to the other for unit upsets and emergencies. This steam is sold at the full cost of production of
the steam, based on an agreed upon formula. 

  
 Schedule 6 

 SCHEDULE 7 

ACCOUNTING PROCEDURES 
 1.0
Statements and Billings. Each Party shall bill the other Party in accordance with Section 10.1(a) of this Agreement. If requested by a Party, the Party issuing the bill will promptly provide reasonably sufficient support for the
Expenditures anticipated to be incurred for the following Month. Bills will be summarized by appropriate classifications indicative of the nature thereof and will be accompanied by such detail and supporting documentation as the paying Party may
reasonably request. 
 2.0 Records. The Parties shall maintain accurate books and records covering all of such Parties’ performance of
the relevant Services. 
 3.0 Purchase of Materials. All material, equipment and supplies used or consumed at the Ethylene Assets will be
owned by Owner and purchased or furnished for its account. So far as is reasonably practical and consistent with efficient, safe and economical operation as determined by the Westlake Parties, only such material shall be obtained for the Ethylene
Assets as may be required for immediate or near-term use, and the accumulation of surplus stock shall be avoided. To the extent reasonably possible, the Westlake Parties shall take advantage of discounts available by early payments and pass such
benefits (or an allocable portion thereof) on to Owner. 
 4.0 Accounting Principles. 

(a) The Westlake Parties are part of an affiliated group of companies (the “Affiliated Group”) that as of the date of
this Agreement are engaged in the manufacture and marketing of chemicals, vinyls, olefins, polymers and various fabricated building products. Accounting, purchasing, and risk management (among other functions and services) as of the date of this
Agreement are managed or provided by the Westlake Parties or one of their Affiliates to the Affiliated Group. The costs and expenses incurred by the Westlake Parties or such Affiliate in managing or providing such functions and services are accrued
on the books and records of the Westlake Parties in accordance with GAAP and are allocated (where applicable) among the members of the Affiliated Group in accordance with GAAP (the “Accounting Principles”). 

(b) The costs and expenses incurred by Owner or such Affiliate in managing or providing functions and services as at the date of this
Agreement are accrued on the books and records of Owner in accordance with the Accounting Principles. 
 (c) For purposes of this Schedule,
Expenditures shall be classified as either “Owner Only Expenditures”, “Westlake Only Expenditures” or “Other Expenditures”: 

(i) “Owner Only Expenditures” shall be comprised of the Expenditures (Operating Expenses and Capital Expenditures) which are
incurred solely in respect of the Ethylene Assets, Owner or Owner’s business. Owner Only Expenditures shall include (without limitation) Taxes imposed on the Ethylene Assets or the operation thereof, the cost of employees, labor, materials,
equipment, supplies, replacement parts, license and Permit fees and fees of accountants and other professionals, in case incurred solely in respect of the Ethylene Assets, Owner or Owner’s business. 

(ii) “Westlake Only Expenditures” shall be comprised of the Expenditures (Operating Expenses and Capital Expenditures) which are
incurred solely in respect of the Westlake Facilities, the Westlake Parties or the business of the Westlake Parties. Westlake Only Expenditures shall include (without limitation) Taxes imposed on the Westlake Facilities or the operation thereof, the
cost of employees, labor, materials, equipment, supplies, replacement parts, and fees of accountants and other professionals, in case incurred solely in respect of the Westlake Facilities, the Westlake Parties or the business of the Westlake
Parties. 

  
 Schedule 7 

 (iii) “Other Expenditures” shall include all Expenditures (Operating and Capital
Expenditures) other than Owner Only Expenditures or “Westlake Only Expenditures”. 
 (d) The Parties shall apply the Accounting
Principles in determining the Expenditures and in allocating the Other Expenditures among the Parties or the other applicable members of the Affiliated Group. The Accounting Principles shall provide a mechanism for validating an Expenditure and all
allocations of an Expenditure. If a Party believes that the determination or allocation of any Expenditure is inconsistent with the Accounting Principles, then such Party shall notify the other Party in writing of the specific manner in which the
first Party regards such determination or allocation to be deficient or objectionable. The second Party shall either correct or change such determination or allocation in accordance with the notice, or, if the second Party disagrees with first
Party’s notice, disputes shall be resolved in accordance with Section 17.10 of this Agreement. Owner’s auditors and the Audit Committee of the GP may make reasonable suggestions on accounting relating to this Agreement, then the
Westlake Parties will reasonably cooperate with Owner in addressing such changes; provided, the implementation of such suggestions shall be subject to the mutual agreement of Owner and the Westlake Parties. 

(e) There shall be no duplication of charges for the same Expenditure. Likewise, no duplication of an Expenditure that has been charged to a
Party under any other agreement between the Parties may occur. 

  
 Schedule 7

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