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UNDERWRITING AGREEMENT

Underwriting Agreement

UNDERWRITING AGREEMENT | Document Parties: MARKWEST ENERGY PARTNERS L P | Basin Pipeline LLC | Centrahoma Processing LLC | LEHMAN BROTHERS INC | MarkWest Blackhawk, LLC | MarkWest Energy GP, LLC | MarkWest Energy Partners, LP | MarkWest Gas Services, LLC | MarkWest Hydrocarbon, Inc | MarkWest Javelina Pipeline Company, LLC | MarkWest New Mexico, LLC | MarkWest Pipeline Company, LLC | MarkWest Texas PNG Utility, LLC | Matrex, LLC | Starfish Pipeline Company, LLC | West Shore Processing Company, LLC You are currently viewing:
This Underwriting Agreement involves

MARKWEST ENERGY PARTNERS L P | Basin Pipeline LLC | Centrahoma Processing LLC | LEHMAN BROTHERS INC | MarkWest Blackhawk, LLC | MarkWest Energy GP, LLC | MarkWest Energy Partners, LP | MarkWest Gas Services, LLC | MarkWest Hydrocarbon, Inc | MarkWest Javelina Pipeline Company, LLC | MarkWest New Mexico, LLC | MarkWest Pipeline Company, LLC | MarkWest Texas PNG Utility, LLC | Matrex, LLC | Starfish Pipeline Company, LLC | West Shore Processing Company, LLC

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Title: UNDERWRITING AGREEMENT
Governing Law: New York     Date: 4/11/2008
Industry: Natural Gas Utilities     Law Firm: Vinson Elkins;Baker Botts     Sector: Utilities

UNDERWRITING AGREEMENT, Parties: markwest energy partners l p , basin pipeline llc , centrahoma processing llc , lehman brothers inc , markwest blackhawk  llc , markwest energy gp  llc , markwest energy partners  lp , markwest gas services  llc , markwest hydrocarbon  inc , markwest javelina pipeline company  llc , markwest new mexico  llc , markwest pipeline company  llc , markwest texas png utility  llc , matrex  llc , starfish pipeline company  llc , west shore processing company  llc
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Exhibit 1.1

Execution Version

MARKWEST ENERGY PARTNERS, L.P.

5,000,000 Common Units
Representing Limited Partner Interests

UNDERWRITING AGREEMENT

April 8, 2008

LEHMAN BROTHERS INC.
MORGAN STANLEY & CO. INCORPORATED
As Representatives of the several
    Underwriters named in
Schedule 1 attached hereto,
c/o Lehman Brothers Inc.
745 Seventh Avenue
New York, New York 10019

Ladies and Gentlemen:

        MarkWest Energy Partners, L.P., a Delaware limited partnership (the " Partnership "), proposes to sell to the underwriters named in Schedule 1 (the " Underwriters ") attached to this underwriting agreement (this " Agreement ") 5,000,000 common units (the " Firm Units ") representing limited partner interests in the Partnership (" Common Units "). In addition, the Partnership proposes to grant to the Underwriters an option to purchase up to 750,000 additional Common Units on the terms set forth in Section 2 (the " Option Units "). The Firm Units and the Option Units, if purchased, are hereinafter collectively called the " Units ." This is to confirm the agreement concerning the purchase of the Units from the Partnership by the Underwriters.

        The Partnership owns all of the outstanding capital stock of MarkWest Hydrocarbon, Inc., a Delaware corporation (" MarkWest Hydrocarbon "), and a 1% limited liability company interest in MarkWest Energy GP, L.L.C., a Delaware limited liability company (" MarkWest Energy GP "). MarkWest Hydrocarbon owns a 99% limited liability company interest in MarkWest Energy GP and a 100% limited liability company interest in Mason Pipeline Limited Liability Company, a Michigan limited liability company (" Mason LLC "). The Partnership conducts its business through MarkWest Energy Operating Company, L.L.C., a Delaware limited liability company (the " Operating Company " and, together with the Partnership, the " MarkWest Parties "), MarkWest Hydrocarbon and Mason LLC. The Operating Company conducts its business through the Operating Subs (as hereinafter defined). Basin Pipeline L.L.C., a Michigan limited liability company (" Basin LLC "), Bright Star Partnership, a Texas general partnership (" Bright Star "), Centrahoma Processing LLC, a Delaware limited liability company (" Centrahoma LLC "), MarkWest Blackhawk, L.L.C., a Texas limited liability company (" Blackhawk LLC "), MarkWest Energy Appalachia, L.L.C., a Delaware limited liability company (" Appalachia LLC "), MarkWest Energy East Texas Gas Company, L.L.C., a Delaware limited liability company (" East Texas LLC "), MarkWest Gas Services, L.L.C., a Texas limited liability company (" Gas Services LLC "), MarkWest Javelina Company, L.L.C., a Texas limited liability company (" Javelina Company LLC "), MarkWest Javelina Pipeline Company, L.L.C., a Texas limited liability company (" Javelina Pipeline LLC "), MarkWest Liberty Gas Gathering, L.L.C., a Delaware limited liability company (" Liberty LLC "), MarkWest Michigan Pipeline Company, L.L.C., a Michigan limited liability company (" Michigan Pipeline LLC "), MarkWest New Mexico, L.L.C., a Texas limited liability company (" New Mexico LLC "), MarkWest Pinnacle, L.L.C., a Texas limited liability company (" Pinnacle LLC "), MarkWest Pioneer, L.L.C., a Delaware limited liability company (" Pioneer LLC "), MarkWest Pipeline Company, L.L.C., a Texas limited liability company (" Pipeline Company LLC "), MarkWest PNG Utility, L.L.C., a Texas limited liability company (" PNG Utility LLC "), MarkWest Power Tex, L.L.C., a Texas limited liability company (" Power Tex LLC "), MarkWest Texas PNG Utility, L.L.C., a Texas


 


limited liability company (" Texas PNG LLC "), MarkWest Oklahoma Gas Company, L.L.C., an Oklahoma limited liability company (" Oklahoma LLC "), Matrex, L.L.C., a Michigan limited liability company (" Matrex LLC "), Starfish Pipeline Company, L.L.C., a Delaware limited liability company (" Starfish LLC "), and West Shore Processing Company, L.L.C., a Michigan limited liability company (" West Shore LLC "), are collectively referred to as the " Operating Subs ." The Partnership, MarkWest Hydrocarbon, Mason LLC, MarkWest Energy GP, the Operating Company and the Operating Subs are collectively referred to as the " MarkWest Entities ."

        1.     Representations, Warranties and Agreements of the MarkWest Parties.     The MarkWest Parties jointly and severally represent, warrant and agree that:

  •         (a)   A registration statement on Form S-3 relating to the Units (i) has been prepared by the Partnership in conformity with the requirements of the Securities Act of 1933, as amended (the " Securities Act "), and the rules and regulations (the " Rules and Regulations ") of the Securities and Exchange Commission (the " Commission ") thereunder; (ii) has been filed with the Commission under the Securities Act; and (iii) is effective under the Securities Act. Copies of such registration statement and any amendment thereto have been delivered by the Partnership to you as the representatives of the Underwriters (the " Representatives "). As used in this Agreement:

    •         (i)    " Applicable Time " means 7:00 a.m., New York City time, on April 9, 2008, which the Underwriters have informed the Partnership and its counsel is a time prior to the first sale of the Units;

              (ii)   " Effective Date " means any date as of which any part of such registration statement relating to the Units became, or is deemed to have become, effective under the Securities Act in accordance with the Rules and Regulations;

              (iii)  " Issuer Free Writing Prospectus " means each "free writing prospectus" (as defined in Rule 405 of the Rules and Regulations) prepared by or on behalf of the Partnership or used or referred to by the Partnership in connection with the offering of the Units;

              (iv)  " Preliminary Prospectus " means any preliminary prospectus relating to the Units included in such registration statement or filed with the Commission pursuant to Rule 424(b) of the Rules and Regulations, including any preliminary prospectus supplement thereto relating to the Units;

              (v)   " Pricing Disclosure Package " means, as of the Applicable Time, the most recent Preliminary Prospectus, together with each Issuer Free Writing Prospectus filed or used by the Partnership on or before the Applicable Time, as set forth on Schedule 2 , other than a road show that is an Issuer Free Writing Prospectus under Rule 433 of the Rules and Regulations;

              (vi)  " Prospectus " means the final prospectus relating to the Units, including any prospectus supplement thereto relating to the Units, as filed with the Commission pursuant to Rule 424(b) of the Rules and Regulations; and

              (vii) " Registration Statement " means the registration statement on Form S-3 (File No. 333-138744), as amended as of the Effective Date, including any Preliminary Prospectus or the Prospectus and all exhibits to such registration statement.

    Any reference to any Preliminary Prospectus or the Prospectus shall be deemed to refer to and include any documents incorporated by reference therein pursuant to Form S-3 under the Securities Act as of the date of such Preliminary Prospectus or the Prospectus, as the case may be. Any reference to the " most recent Preliminary Prospectus " shall be deemed to refer to the latest Preliminary Prospectus included in the Registration Statement or filed pursuant to Rule 424(b) of the Rules and Regulations prior to or on the date hereof (including, for purposes hereof, any documents incorporated by reference therein prior to or on the date hereof). Any reference to any

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  • amendment or supplement to any Preliminary Prospectus or the Prospectus shall be deemed to refer to and include any document filed under the Securities Exchange Act of 1934, as amended (the " Exchange Act "), after the date of such Preliminary Prospectus or the Prospectus, as the case may be, and incorporated by reference in such Preliminary Prospectus or the Prospectus, as the case may be; and any reference to any amendment to the Registration Statement shall be deemed to include any annual report of the Partnership on Form 10-K filed with the Commission pursuant to Section 13(a) or 15(d) of the Exchange Act after the Effective Date that is incorporated by reference in the Registration Statement. The Commission has not issued any order preventing or suspending the use of any Preliminary Prospectus or the Prospectus or suspending the effectiveness of the Registration Statement, and no proceeding or examination for such purpose has been instituted or threatened by the Commission. The Commission has not notified the Partnership of any objection to the use of the form of the Registration Statement.

            (b)   The Partnership has been since the time of initial filing of the Registration Statement and continues to be a "well-known seasoned issuer" (as defined in Rule 405 of the Rules and Regulations) eligible to use Form S-3 for the offering of the Units and is not on the date hereof or on the applicable Delivery Date an "ineligible issuer" (as defined in Rule 405 of the Rules and Regulations) with respect to the offering of the Units. The Registration Statement is an "automatic shelf registration statement" (as defined in Rule 405 of the Rules and Regulations) and was filed not earlier than the date that is three years prior to the applicable Delivery Date (as defined in Section 4).

            (c)   The Registration Statement conformed and will conform in all material respects on the Effective Date and on the applicable Delivery Date, and any amendment to the Registration Statement filed after the date hereof will conform in all material respects when filed, to the requirements of the Securities Act and the Rules and Regulations. The most recent Preliminary Prospectus conformed, and the Prospectus will conform, in all material respects when filed with the Commission pursuant to Rule 424(b) and on the applicable Delivery Date to the requirements of the Securities Act and the Rules and Regulations. The documents incorporated by reference in any Preliminary Prospectus or the Prospectus conformed, and any further documents so incorporated will conform, when filed with the Commission, in all material respects to the requirements of the Exchange Act or the Securities Act, as applicable, and the rules and regulations of the Commission thereunder.

            (d)   The Registration Statement did not, as of the Effective Date, contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading; provided that no representation or warranty is made as to information contained in or omitted from the Registration Statement in reliance upon and in conformity with written information furnished to the Partnership through the Representatives by or on behalf of any Underwriter specifically for inclusion therein, which information is specified in Section 8(e).

            (e)   The Prospectus will not, as of its date and on the applicable Delivery Date, contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided that no representation or warranty is made as to information contained in or omitted from the Prospectus in reliance upon and in conformity with written information furnished to the Partnership through the Representatives by or on behalf of any Underwriter specifically for inclusion therein, which information is specified in Section 8(e).

            (f)    The documents incorporated by reference in any Preliminary Prospectus or the Prospectus did not, and any further documents filed and incorporated by reference therein will not, when filed with the Commission, contain an untrue statement of a material fact or omit to state a material

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  • fact required to be stated therein or necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading.

            (g)   The Pricing Disclosure Package did not, as of the Applicable Time, contain an untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided that no representation or warranty is made as to information contained in or omitted from the Pricing Disclosure Package in reliance upon and in conformity with written information furnished to the Partnership through the Representatives by or on behalf of any Underwriter specifically for inclusion therein, which information is specified in Section 8(e).

            (h)   Each Issuer Free Writing Prospectus (including, without limitation, any road show that is a free writing prospectus under Rule 433 of the Rules and Regulations), when considered together with the Pricing Disclosure Package as of the Applicable Time, did not contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading.

            (i)    Each Issuer Free Writing Prospectus conformed or will conform in all material respects to the requirements of the Securities Act and the Rules and Regulations on the date of first use, and the Partnership has complied with any filing requirements applicable to such Issuer Free Writing Prospectus pursuant to the Rules and Regulations. The Partnership has not made any offer relating to the Units that would constitute an Issuer Free Writing Prospectus without the prior written consent of the Representatives. The Partnership has retained in accordance with the Rules and Regulations all Issuer Free Writing Prospectuses that were not required to be filed pursuant to the Rules and Regulations. The Partnership filed the Registration Statement before using any Issuer Free Writing Prospectus and each Issuer Free Writing Prospectus was accompanied by the most recent Preliminary Prospectus satisfying the requirements of Section 10 of the Securities Act. The Partnership has taken all actions necessary so that any road show (as defined in Rule 433 of the Rules and Regulations) in connection with the offering of the Units will not be required to be filed pursuant to the Rules and Regulations.

            (j)    The Partnership has been duly formed and is validly existing in good standing as a limited partnership under the Delaware Revised Uniform Limited Partnership Act (" Delaware LP Act ") with full partnership power and authority to own or lease its properties and to conduct its business in all material respects as described in the Pricing Disclosure Package and the Prospectus. The Partnership is duly registered or qualified as a foreign limited partnership for the transaction of business under the laws of each jurisdiction in which the character of the business conducted by it or the nature or location of the properties owned or leased by it makes such registration or qualification necessary, except where the failure so to register or qualify would not, individually or in the aggregate, (i) have a material adverse effect on the business, prospects, financial condition or results of operations of the MarkWest Entities, taken as a whole (" Material Adverse Effect "), or (ii) subject the limited partners of the Partnership to any material liability or disability.

            (k)   MarkWest Hydrocarbon has been duly formed and is validly existing in good standing as a corporation under the Delaware General Corporation Law (the " DGCL "), with full corporate power and authority to own or lease its properties and to conduct its business, in each case in all material respects as described in the Pricing Disclosure Package and the Prospectus. MarkWest Hydrocarbon is duly registered or qualified as a foreign corporation for the transaction of business under the laws of each jurisdiction in which the character of the business conducted by it or the nature or location of the properties owned or leased by it makes such registration or qualification necessary, except where the failure so to register or qualify would not, individually or in the

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  • aggregate, (i) have a Material Adverse Effect or (ii) subject the limited partners of the Partnership to any material liability or disability.

            (l)    Each of MarkWest Energy GP, the Operating Company, Liberty LLC, Centrahoma LLC, Appalachia LLC, East Texas LLC, Pioneer LLC and Starfish LLC has been duly formed and is validly existing in good standing as a limited liability company under the Delaware Limited Liability Company Act (the " Delaware LLC Act "), each of Blackhawk LLC, Gas Services LLC, Javelina Company LLC, Javelina Pipeline LLC, New Mexico LLC, Pinnacle LLC, Pipeline Company LLC, PNG Utility LLC, Power Tex LLC and Texas PNG LLC has been duly formed and is validly existing and in good standing as a limited liability company under the Texas Limited Liability Company Act (the " Texas LLC Act ") or the Texas Business Organizations Code (the " TBOC "), as applicable, each of Basin LLC, Mason LLC, Michigan Pipeline LLC, Matrex LLC and West Shore LLC has been duly formed and is validly existing and in good standing as a limited liability company under the Michigan Limited Liability Company Act (the " Michigan LLC Act ") and Oklahoma LLC has been duly formed and is validly existing and in good standing as a limited liability company under the Oklahoma Limited Liability Company Act (the " Oklahoma LLC Act "), in each case with full limited liability company power and authority to own or lease its properties and to conduct its business, in each case in all material respects as described in the Pricing Disclosure Package and the Prospectus. Each of MarkWest Energy GP, the Operating Company and each of the Operating Subs set forth above is duly registered or qualified as a foreign limited liability company for the transaction of business under the laws of each jurisdiction in which the character of the business conducted by it or the nature or location of the properties owned or leased by it makes such registration or qualification necessary, except where the failure so to register or qualify would not, individually or in the aggregate, (i) have a Material Adverse Effect or (ii) subject the limited partners of the Partnership to any material liability or disability.

            (m)  Bright Star has been duly formed and is validly existing as a general partnership under the laws of the State of Texas with full partnership power and authority to own or lease its properties and to conduct its business, in each case in all material respects as described in the Pricing Disclosure Package and the Prospectus. Bright Star is duly registered or qualified as a foreign partnership for the transaction of business under the laws of each jurisdiction in which the character of the business conducted by it or the nature or location of the properties owned or leased by it makes such registration or qualification necessary, except where the failure so to register or qualify would not, individually or in the aggregate, (i) have a Material Adverse Effect or (ii) subject the limited partners of the Partnership to any material liability or disability.

            (n)   The issued and outstanding limited partner interests of the Partnership consist of 50,876,295 Common Units and 22,640,000 Class A Units, as such term is defined in the Third Amended and Restated Agreement of Limited Partnership of the Partnership (as the same has been and may be amended or restated at or prior to the applicable Delivery Date, the " Partnership Agreement "). All outstanding Common Units and Class A Units and the limited partner interests represented thereby have been duly authorized and validly issued in accordance with the Partnership Agreement and are fully paid (to the extent required under the Partnership Agreement) and nonassessable (except as such nonassessability may be affected by Section 17-607 of the Delaware LP Act and as otherwise described in the Prospectus). MarkWest Hydrocarbon owns 8,900,000 Class A Units and (ii) MarkWest Energy GP owns 13,740,000 Class A Units, in each case free and clear of all liens, encumbrances, security interests, equities, charges or claims.

            (o)   At the applicable Delivery Date, the Units to be sold by the Partnership and the limited partner interests represented thereby will be duly authorized in accordance with the Partnership Agreement and, when issued and delivered to the Underwriters against payment therefor in accordance with the terms hereof, will be validly issued, fully paid (to the extent required under

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  • the Partnership Agreement) and nonassessable (except as such nonassessability may be affected by Section 17-607 of the Delaware LP Act).

            (p)   The Partnership owns 100% of the issued and outstanding shares of capital stock of MarkWest Hydrocarbon; such shares have been duly authorized and validly issued in accordance with the certificate of incorporation and bylaws of MarkWest Hydrocarbon (as the same may be amended or restated at or prior to the applicable Delivery Date) and are fully paid and nonassessable; and the Partnership owns such shares of free and clear of all liens, encumbrances, security interests, equities, charges or claims, except as may arise under the Credit Agreement, dated as of February 20, 2008 (the " Credit Agreement "), among the Partnership, Royal Bank of Canada, as administrative and collateral agent, and the other parties named therein, or as described in the Pricing Disclosure Package and the Prospectus.

            (q)   The Partnership owns 1% of the issued and outstanding membership interests in MarkWest Energy GP and 100% of the issued and outstanding membership interests in the Operating Company; such membership interests have been duly authorized and validly issued in accordance with the limited liability company agreement of MarkWest Energy GP (as the same may be amended or restated at or prior to the applicable Delivery Date, the " MarkWest Energy GP LLC Agreement ") and the limited liability company agreement of the Operating Company (as the same may be amended or restated at or prior to the applicable Delivery Date, the " Operating Company LLC Agreement "), respectively, and are fully paid (to the extent required under the MarkWest Energy GP LLC Agreement and the Operating Company LLC Agreement, respectively) and nonassessable (except in each case as such nonassessability may be affected by Section 18-607 of the Delaware LLC Act); and the Partnership owns such membership interests free and clear of all liens, encumbrances, security interests, equities, charges or claims, except as may arise under the Credit Agreement or as described in the Pricing Disclosure Package and the Prospectus.

            (r)   MarkWest Hydrocarbon owns 99% of the issued and outstanding membership interests in MarkWest Energy GP; such membership interests have been duly authorized and validly issued in accordance with the MarkWest Energy GP LLC Agreement and are fully paid (to the extent required under the MarkWest Energy GP LLC Agreement) and nonassessable (except as such nonassessability may be affected by Section 18-607 of the Delaware LLC Act); and MarkWest Hydrocarbon owns its membership interests free and clear of all liens, encumbrances, security interests, equities, charges or claims, except as may arise under the Credit Agreement or as described in the Pricing Disclosure Package and the Prospectus.

            (s)   The Operating Company directly owns 100% of the issued and outstanding membership interests in each of the Operating Subs, except that (i) the Operating Company owns 50% of the issued and outstanding membership interests in Starfish LLC, (ii) Basin LLC owns 100% of the issued and outstanding membership interest in Matrex LLC, (iii) Oklahoma LLC owns 20% of the issued and outstanding membership interests in Centrahoma LLC and (iv) as set forth in Section 1(t), (all such Operating Subs, excluding Bright Star, which is described in Section 1(t), are referred to herein collectively as the " LLC Operating Subs "); such membership interests have been duly authorized and validly issued in accordance with the respective limited liability company agreements of the LLC Operating Subs (as the same may be amended or restated at or prior to applicable Delivery Date, the " Operating Subs LLC Agreements ") and are fully paid (to the extent required under the respective Operating Subs LLC Agreements) and nonassessable (except as such nonassessability may be affected by Section 18-607 of the Delaware LLC Act, Article 5.09 of the Texas LLC Act, Section 101.206 of the TBOC, Sections 2033 and 2035 of the Oklahoma LLC Act or Section 450.4308 of the Michigan LLC Act); and the Operating Company, Basin LLC and Oklahoma LLC own such membership interests free and clear of all liens, encumbrances, security

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  • interests, equities, charges or claims, except as may arise under the Credit Agreement or as described in the Pricing Disclosure Package and the Prospectus.

            (t)    Pinnacle LLC owns 90% of the issued and outstanding general partnership interests in Bright Star; such general partnership interests have been duly authorized and validly issued in accordance with the partnership agreement of Bright Star (as the same has been and may be amended or restated at or prior to the applicable Delivery Date, the " Bright Star Partnership Agreement "); and Pinnacle LLC owns such general partnership interests free and clear of all liens, encumbrances, security interests, equities, charges or claims, except for such liens, encumbrances, security interests, equities, charges and claims arising under the Credit Agreement or described in the Pricing Disclosure Package and the Prospectus.

            (u)   Other than (i) the Partnership's (A) ownership of the capital stock of MarkWest Hydrocarbon, (B) membership interest in MarkWest Energy GP and the Operating Company and (C) ownership of 100% of the issued and outstanding shares of capital stock in MarkWest Energy Finance Corporation, a Delaware corporation, (ii) MarkWest Hydrocarbon's membership interest in MarkWest Energy GP and ownership of 100% of the issued and outstanding membership interests in Mason LLC, (iii) the Operating Company's ownership of its membership interest in the LLC Operating Subs, as described in Section 1(s), (iv) Basin LLC's membership interest in Matrex LLC, (v) Oklahoma LLC's membership interest in Centrahoma LLC, (vi) Pinnacle LLC's ownership of the general partnership interests in Bright Star and (vii) Starfish LLC's ownership of 100% of the issued and outstanding membership interests in West Cameron Dehydration Company, LLC, a Delaware limited liability company, Stingray Pipeline Company, L.L.C., a Delaware limited liability company, and Triton Gathering, LLC, a Delaware limited liability company, none of the MarkWest Parties owns, or at the applicable Delivery Date will own, directly or indirectly, any equity or long-term debt securities of any corporation, partnership, limited liability company, joint venture, association or other entity.

            (v)   Except as may arise under the Credit Agreement or as described in the Pricing Disclosure Package and the Prospectus or in the organizational documents of the MarkWest Entities, there are no preemptive rights or other rights to subscribe for or to purchase, nor any restriction upon the voting or transfer of, any shares of capital stock of or partnership or membership interests in any of the MarkWest Entities. Neither the filing of the Registration Statement nor the offering or sale of the Units as contemplated by this Agreement gives rise to any rights for or relating to the registration of any Units or other securities of the Partnership, other than as have been waived or deemed waived. Except as described in the Pricing Disclosure Package and the Prospectus, there are no outstanding options or warrants to purchase any shares of capital stock of or partnership or member interests in any MarkWest Entity.

            (w)  The Partnership has all requisite power and authority to issue, sell and deliver the Units to be sold by it hereunder, in accordance with and upon the terms and conditions set forth in this Agreement, the Partnership Agreement and the Registration Statement, the Pricing Disclosure Package and the Prospectus. At the applicable Delivery Date, all corporate, partnership and limited liability company action, as the case may be, required to be taken by the MarkWest Entities or any of their stockholders, partners or members for the authorization, issuance, sale and delivery of the Units to be sold by the Partnership hereunder and the consummation of the transactions contemplated by this Agreement, shall have been validly taken.

            (x)   This Agreement has been duly authorized, validly executed and delivered by each of the MarkWest Parties, and constitutes the valid and legally binding agreement of each of the MarkWest Parties, enforceable against each of them in accordance with its terms; provided that the enforceability thereof may be limited by bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium and similar laws relating to or affecting creditors' rights generally and by general

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  • principles of equity (regardless of whether such enforceability is considered in a proceeding in equity or at law); provided, further, that the indemnity and contribution provisions hereunder may be limited by applicable laws, general principles of equity and public policy.

            (y)   At or before the applicable Delivery Date:

    •         (i)    The Partnership Agreement has been duly authorized, executed and delivered by MarkWest Energy GP and MarkWest Hydrocarbon, in the capacities set forth on the signature page to the Partnership Agreement, and is a valid and legally binding agreement of MarkWest Energy GP and MarkWest Hydrocarbon, enforceable against each of them in such capacities in accordance with its terms;

              (ii)   The MarkWest Energy GP LLC Agreement has been duly authorized, executed and delivered by the Partnership and MarkWest Hydrocarbon and is a valid and legally binding agreement of the Partnership and MarkWest Hydrocarbon, enforceable against each of them in accordance with its terms;

              (iii)  The Operating Company LLC Agreement has been duly authorized, executed and delivered by the Partnership and is a valid and legally binding agreement of the Partnership, enforceable against it in accordance with its terms;

              (iv)  Each of the Operating Subs LLC Agreements has been duly authorized, executed and delivered by the Operating Company or other MarkWest Entity party thereto and, assuming due and valid authorization, execution and delivery thereof by any unaffiliated parties thereto, as applicable, is a valid and legally binding agreement of the Operating Company or other MarkWest Entity, as applicable, enforceable against it in accordance with its terms; and

              (v)   The Bright Star Partnership Agreement has been duly authorized, executed and delivered by Pinnacle LLC and, assuming due and valid authorization, execution and delivery thereof by the other party thereto, is a valid and legally binding agreement of Pinnacle LLC, enforceable against it in accordance with its terms;

    provided that, with respect to each agreement described in this Section 1(y), the enforceability thereof may be limited by bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium and similar laws relating to or affecting creditors' rights generally and by general principles of equity (regardless of whether such enforceability is considered in a proceeding in equity or at law); and, provided, further, that the indemnity, contribution and exoneration provisions contained in any of such agreements may be limited by applicable laws and public policy. The Partnership Agreement, the MarkWest Energy GP LLC Agreement, the Operating Company LLC Agreement, the Operating Subs LLC Agreements and the Bright Star Partnership Agreement are herein collectively referred to as the " Operative Agreements ."

            (z)   None of the offering, issuance and sale by the Partnership of the Units to be sold by it hereunder, the execution, delivery and performance of this Agreement by the MarkWest Parties, or the consummation by the MarkWest Parties of the transactions contemplated hereby (i) conflicts or will conflict with or constitutes or will constitute a violation of the bylaws, partnership agreement, agreement of limited partnership, limited liability company agreement or other organizational documents of the MarkWest Entities, (ii) conflicts or will conflict with or constitutes or will constitute a breach or violation of, or a default (or an event which, with notice or lapse of time or both, would constitute such a default) under any indenture, mortgage, deed of trust, loan agreement, lease or other agreement or instrument to which any of the MarkWest Entities is a party or by which any of them or any of their respective properties may be bound, (iii) violates or will violate any statute, law or regulation or any order, judgment, decree or injunction of any court or governmental agency or body directed to any of the MarkWest Entities or any of their

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  • properties in a proceeding to which any of them or their property is a party or (iv) results or will result in the creation or imposition of any lien, charge or encumbrance upon any property or assets of any of the MarkWest Entities, which conflicts, breaches, violations, defaults, liens, changes or encumbrances, in the case of clauses (ii), (iii) or (iv), would, individually or in the aggregate, have a Material Adverse Effect.

            (aa)   No permit, consent, approval, authorization, order, registration, filing or qualification (" consent ") of or with any court, governmental agency or body having jurisdiction over the MarkWest Entities or any of their respective properties is required for the offering, issuance and sale by the Partnership of the Units to be sold by it hereunder in connection with the execution, delivery and performance of this Agreement by the MarkWest Parties or the consummation by the MarkWest Parties of the transactions contemplated by this Agreement, except (i) for such consents required under the Securities Act, the Exchange Act and state securities or "Blue Sky" laws, (ii) for such consents which have been, or prior to the applicable Delivery Date will be, obtained and (iii) for such consents which, if not obtained, would not, individually or in the aggregate, have a Material Adverse Effect.

            (bb)   None of the MarkWest Entities is in (i) violation of its certificate of incorporation, limited partnership, formation or organization, bylaws, partnership agreement, agreement of limited partnership, limited liability company agreement or other organizational documents, as applicable, (ii) violation of any law, statute, ordinance, administrative or governmental rule or regulation applicable to it or of any order, judgment, decree or injunction of any court or governmental agency or body having jurisdiction over it or (iii) breach, default (or an event which, with notice or lapse of time or both, would constitute such a default) or violation in the performance of any obligation, agreement or condition contained in any bond, debenture, note or any other evidence of indebtedness or in any agreement, indenture, lease or other instrument to which it is a party or by which it or any of its properties may be bound, which breach, default or violation in the case of clause (ii) or (iii) would, if continued, have a Material Adverse Effect or could materially impair the ability of any of the MarkWest Parties to perform their respective obligations under this Agreement or the ability of any of the MarkWest Entities to perform their respective obligations under any of the Operative Agreements. To the knowledge of the MarkWest Parties, no third party to any indenture, mortgage, deed of trust, loan agreement or other agreement or instrument to which any of the MarkWest Entities is a party or by which any of them is bound or to which any of their properties is subject, is in default under any such agreement, which breach, default or violation would, if continued, have a Material Adverse Effect.

            (cc)   The Units, when issued and delivered against payment therefor as provided herein, and the Class A Units will conform in all material respects to the descriptions thereof contained in the Pricing Disclosure Package and the Prospectus.

            (dd)   Deloitte & Touche LLP, which has certified certain financial statements of the Partnership and delivered its opinion with respect to certain audited financial statements and schedules included in the Registration Statement, the most recent Preliminary Prospectus and the Prospectus (or any amendment or supplement thereto), is an independent registered public accounting firm with respect to the Partnership within the meaning of the Securities Act and the Rules and Regulations.

            (ee)   At December 31, 2007, the Partnership would have had, on an actual, pro forma and pro forma as adjusted basis as indicated in the most recent Preliminary Prospectus and the Prospectus (and any amendment or supplement thereto), a capitalization as set forth therein. The historical financial statements (including the related notes and supporting schedules) included in the Registration Statement, the most recent Preliminary Prospectus and the Prospectus (and any amendment or supplement thereto) present fairly in all material respects the financial position,

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  • results of operations and cash flows of the entities purported to be shown thereby on the basis stated therein at the respective dates or for the respective periods to which they apply and have been prepared in accordance with accounting principles generally accepted in the United States consistently applied throughout the periods involved, except to the extent disclosed therein. The summary historical and pro forma financial information set forth in the most recent Preliminary Prospectus and the Prospectus (and any amendment or supplement thereto) under the caption "Summary Historical and Unaudited Pro Forma Condensed Combined Financial and Operating Data" is accurately presented in all material respects and prepared on a basis consistent with the audited and unaudited historical consolidated financial statements and pro forma financial statements, as applicable, from which it has been derived. The pro forma financial statements of the Partnership included in the Registration Statement, the most recent Preliminary Prospectus and the Prospectus (and any amendment or supplement thereto) have been prepared in all material respects in accordance with the applicable accounting requirements of Article 11 of Regulation S-X of the Commission; the assumptions used in the preparation of such pro forma financial statements are, in the opinion of the management of the Partnership, reasonable; and the pro forma adjustments reflected in such pro forma financial statements have been properly applied to the historical amounts in compilation of such pro forma financial statements.

            (ff)    The statistical and market-related data included or incorporated by reference in the most recent Preliminary Prospectus and the Prospectus are based on or derived from sources that the Partnership believes to be reliable and accurate in all material respects.

            (gg)   Except as described in the Pricing Disclosure Package and the Prospectus, no relationship, direct or indirect, exists between or among the Partnership, on the one hand, and the directors, officers, unitholders, customers or suppliers of any of the MarkWest Entities, on the other hand, that is required to be described in the Pricing Disclosure Package or the Prospectus which is not so described.

            (hh)   Except as disclosed in the Pricing Disclosure Package and the Prospectus, none of the MarkWest Entities has sustained since the date of the latest audited financial statements included in the Registration Statement, the most recent Preliminary Prospectus and the Prospectus any material loss or interference with its business from fire, explosion, flood or other calamity, whether or not covered by insurance, or from any labor dispute or court or governmental action, investigation, order or decree, otherwise than as set forth or contemplated in the Pricing Disclosure Package and the Prospectus. Except as disclosed in the Registration Statement, the Pricing Disclosure Package and the Prospectus (or any amendment or supplement thereto), subsequent to the respective dates as of which such information is given in the Registration Statement, the Pricing Disclosure Package and the Prospectus (or any amendment or supplement thereto), (i) none of the MarkWest Entities has incurred any liability or obligation, indirect, direct or contingent, or entered into any transactions, not in the ordinary course of business, that, individually or in the aggregate, is material to the MarkWest Entities, taken as a whole, (ii) there has not been any material change in the capitalization, or material increase in the short-term debt or long-term debt, of the MarkWest Entities, taken as a whole and (iii) there has not been any material adverse change, or any development involving or which may reasonably be expected to involve, individually or in the aggregate, a prospective material adverse change in or affecting the business, prospects, properties, management, condition (financial or other), partners' capital, net worth or results of operations of the MarkWest Entities, taken as a whole.

            (ii)     There are no legal or governmental proceedings pending or, to the knowledge of the MarkWest Parties, threatened against any of the MarkWest Entities, or to which any of the MarkWest Entities is a party, or to which any of their respective properties is subject, that are required to be described in the Registration Statement, the Pricing Disclosure Package or the Prospectus but are not described as required, and there are no agreements, contracts, indentures,

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  • leases or other instruments that are required to be described in the Registration Statement, the Pricing Disclosure Package or the Prospectus or to be filed as exhibits to the Registration Statement that are not described or filed as required by the Rules and Regulations.

            (jj)     The MarkWest Entities have good and indefeasible title to all real property and good title to all personal property described in the Pricing Disclosure Package and the Prospectus as owned by the MarkWest Entities, free and clear of all liens, claims, security interests, or other encumbrances, except such as (i) do not materially affect the value of such property and do not materially interfere with the use made and proposed to be made of such property by the MarkWest Entities, (ii) could not reasonably be expected to have a Material Adverse Effect or (iii) are described, and subject to the limitations contained, in the Pricing Disclosure Package and the Prospectus.

            (kk)   Each of the MarkWest Entities has such consents, easements, rights-of-way, permits or licenses from each person (collectively, " rights-of-way ") as are necessary to conduct its business in the manner described, and subject to the limitations contained, in the Pricing Disclosure Package and the Prospectus, except for (i) qualifications, reservations and encumbrances that would not have a Material Adverse Effect and (ii) such rights-of-way that, if not obtained, would not have, individually or in the aggregate, a Material Adverse Effect; other than as set forth, and subject to the limitations contained, in the Pricing Disclosure Package and the Prospectus, each of the MarkWest Entities has fulfilled and performed all its material obligations with respect to such rights-of-way and no event has occurred that allows, or after notice or lapse of time would allow, revocation or termination thereof or would result in any impairment of the rights of the holder of any such rights-of-way, except for such revocations, terminations and impairments that would not have a Material Adverse Effect; and, except as described in the Pricing Disclosure Package and the Prospectus, none of such rights-of-way contains any restriction that is materially burdensome to the MarkWest Entities, taken as a whole.

            (ll)     Each of the MarkWest Entities has, or at the applicable Delivery Date will have, such permits, consents, licenses, franchises, certificates and authorizations of governmental or regulatory authorities (" permits ") as are necessary to own its properties and to conduct its business in the manner described in the Registration Statement, the Pricing Disclosure Package and the Prospectus, subject to such qualifications as may be set forth in the Registration Statement, the Pricing Disclosure Package and the Prospectus and except for such permits that, if not obtained, would not, individually or in the aggregate, have a Material Adverse Effect and except for any permits that are of a routine or administrative nature that are expected in the reasonable judgment of management of the Partnership to be obtained, as necessary, in the ordinary course of business subsequent to the date hereof; each of the MarkWest Entities has fulfilled and performed all its material obligations with respect to such permits which are due to have been fulfilled and performed by such date in the manner described, and subject to the limitations contained, in the Registration Statement, the Pricing Disclosure Package and the Prospectus and no event has occurred which allows, or after notice or lapse of time would allow, revocation or termination thereof or results in any impairment of the rights of the holder of any such permit, except for such revocations, terminations and impairments that would not, individually or in the aggregate, have a Material Adverse Effect; and, except as described in the Registration Statement, the Pricing Disclosure Package and the Prospectus, none of such permits contains any restriction that is materially burdensome to the MarkWest Entities, taken as a whole.

            (mm)    Except as described in the Pricing Disclosure Package and the Prospectus, the Partnership (i) makes and keeps books, records and accounts, which, in reasonable detail, accurately and fairly reflect transactions and dispositions of assets and (ii) maintains effective internal control over financial reporting as defined in Rule 13a-15 under the Exchange Act and a system of internal accounting controls sufficient to provide reasonable assurances that

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  • (A) transactions are executed in accordance with management's general or specific authorization; (B) transactions are recorded as necessary to permit preparation of financial statements in conformity with accounting principles generally accepted in the United States and to maintain accountability for its assets; (C) access to assets is permitted only in accordance with management's general or specific authorization; and (D) the recorded accountability for assets is compared with existing assets at reasonable intervals and appropriate action is taken with respect to any differences.

            (nn)   (i) The Partnership has established and maintains disclosure controls and procedures (as such term is defined in Rule 13a-15 under the Exchange Act), (ii) such disclosure controls and procedures are designed to ensure that the information required to be disclosed by the Partnership in the reports it files or will file or submit under the Exchange Act, as applicable, is accumulated and communicated to management of the Partnership including its respective principal executive officers and principal financial officers, as appropriate, to allow such officers to make timely decisions regarding required disclosure and (iii) except as described in the Pricing Disclosure Package and the Prospectus, such disclosure controls and procedures are effective in all material respects to perform the functions for which they were established.

            (oo)   Since the date of the most recent balance sheet of the Partnership and its consolidated subsidiaries reviewed or audited by Deloitte & Touche LLP and the audit committee of the board of directors of MarkWest Energy GP, the Partnership has not been advised of (i) any significant deficiencies in the design or operation of internal controls that could adversely affect the Partnership's ability to record, process, summarize and report financial data, or any material weaknesses in internal controls except as described in the Pricing Disclosure Package and the Prospectus or (ii) any fraud, whether or not material, that involves management or other employees who have a significant role in the Partnership's internal controls.

            (pp)   There is and has been no failure on the part of the Partnership or any of the directors or officers of MarkWest Energy GP, in their capacities as such, to comply in all material respects with the provisions of the Sarbanes-Oxley Act of 2002 and the rules and regulations promulgated in connection therewith.

            (qq)   Each of the MarkWest Entities has filed (or has obtained extensions with respect to) all material federal, state and foreign income and franchise tax returns required to be filed through the date hereof, which returns are complete and correct in all material respects, and has timely paid all taxes shown to be due, if any, pursuant to such returns, other than those (i) which are being contested in good faith and for which adequate reserves have been established in accordance with accounting principles generally accepted in the United States or (ii) which, if not paid, would not have a Material Adverse Effect.

            (rr)    None of the MarkWest Entities is now, and after sale of the Units to be sold by the Partnership hereunder and application of the net proceeds from such sale as described in the most recent Preliminary Prospectus and the Prospectus under the caption "Use of Proceeds," none of the MarkWest Entities will be, an "investment company" or a company "controlled by" an "investment company" within the meaning of the Investment Company Act of 1940, as amended.

            (ss)    Except as described in the Pricing Disclosure Package and the Prospectus, the MarkWest Entities (i) are in compliance with any and all applicable federal, state and local laws and regulations relating to the protection of human health and safety and the environment or imposing liability or standards of conduct concerning any Hazardous Material (as hereinafter defined) (" Environmental Laws "), (ii) have received all permits required of them under applicable Environmental Laws to conduct their respective businesses, (iii) are in compliance with all terms and conditions of any such permit and (iv) do not have any liability in connection with the release into the environment of any Hazardous Materials (as defined below), except where such

12


 


  • noncompliance with Environmental Laws, failure to receive required permits, or failure to comply with the terms and conditions of such permits or liability in connection with such releases would not, individually or in the aggregate, have a Material Adverse Effect. The term " Hazardous Material " means (A) any "hazardous substance" as defined in the Comprehensive Environmental Response, Compensation and Liability Act of 1980, as amended, (B) any "hazardous waste" as defined in the Resource Conservation and Recovery Act, as amended, (C) any petroleum or petroleum product, (D) any polychlorinated biphenyl and (E) any pollutant or contaminant or hazardous, dangerous or toxic chemical, material, waste or substance regulated under or within the meaning of any other Environmental Law.

            (tt)    No labor dispute with the employees of the MarkWest Entities exists or, to the knowledge of the MarkWest Parties, is imminent or threatened that is reasonably likely to result in a Material Adverse Effect.

            (uu)   The MarkWest Entities maintain insurance covering the properties, operations, personnel and businesses of the MarkWest Entities against such losses and risks as are reasonably adequate to protect them and their businesses in a manner consistent with other businesses similarly situated. None of the MarkWest Entities has received notice from any insurer or agent of such insurer that substantial capital improvements or other expenditures will have to be made in order to continue such insurance, and all such insurance is outstanding and duly in force on the date hereof and will be outstanding and duly in force on the applicable Delivery Date.

            (vv)   Except as described in the Pricing Disclosure Package and the Prospectus, there is (i) no action, suit or proceeding before or by any court, arbitrator or governmental agency, body or official, domestic or foreign, now pending or, to the knowledge of the MarkWest Parties, threatened, to which any of the MarkWest Entities is or may be a party or to which the business or property of any of the MarkWest Entities is or may be subject, (ii) no statute, rule, regulation or order that has been enacted, adopted or issued by any governmental agency or, to the knowledge of the MarkWest Parties, proposed by any governmental agency and (iii) no injunction, restraining order or order of any nature issued by a federal or state court or foreign court of competent jurisdiction to which any of the MarkWest Entities is or may be subject, that, in the case of clauses (i), (ii) and (iii) above, is reasonably likely to (A) individually or in the aggregate have a Material Adverse Effect, (B) prevent or result in the suspension of the offering and issuance of the Units, or (C) in any manner draw into question the validity of this Agreement or any of the Operative Agreements.

            (ww)    None of the MarkWest Entities has distributed and, prior to the later to occur of (i) any Delivery Date and (ii) completion of the distribution of the Firm Units or Option Units, as the case may be, will not distribute, any prospectus (as defined under the Securities Act) in connection with the offering and sale of the Units other than any Preliminary Prospectus, the Prospectus, any Issuer Free Writing Prospectus, subject to the conditions in Section 1(i) of this Agreement, or other materials, if any, permitted by the Securities Act, including Rule 134 of the Rules and Regulations.

            (xx)   The Units have been approved for listing on the New York Stock Exchange, subject only to official notice of issuance.

            (yy)   None of the MarkWest Entities (i) has taken, and none of such persons shall take, directly or indirectly, any action designed to cause or result in, or which has constituted or which would reasonably be expected to constitute, the stabilization or manipulation of the price of the Common Units to facilitate the sale or resale of the Common Units in violation of any law, rule or regulation or (ii) since the initial filing of the Registration Statement, except as contemplated by this Agreement, (A) has sold, bid for, purchased or paid anyone any compensation for soliciting purchases of the Common Units or (B) has paid or agreed to pay to any person any compensation for soliciting another to purchase any other securities of the Partnership.

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  •         (zz)   Neither the Partnership nor any of its affiliates has, prior to the date hereof, made any offer or sale of any securities which could be "integrated" for purposes of the Securities Act or the Rules and Regulations with the offer and sale of the Units pursuant to the Registration Statement. Except as disclosed in the Pricing Disclosure Package and the Prospectus, neither the Partnership nor any of its affiliates has sold or issued any security during the six month period preceding the date of the Prospectus, including but not limited to any sales pursuant to Rule 144A or Regulation D or S under the Securities Act, other than Common Units issued pursuant to employee benefit plans, qualified unit option plans or the employee compensation plans or pursuant to outstanding options, rights or warrants as described in the Pricing Disclosure Package and the Prospectus.

            (aaa)    None of the MarkWest Parties has any subsidiaries, other than MarkWest Hydrocarbon, MarkWest Energy GP, the Operating Company, Appalachia LLC, Pinnacle LLC, Javelina Company LLC, Oklahoma LLC, East Texas LLC and Starfish LLC (collectively, the " Significant Subsidiaries "), which, individually or considered as a whole, would be deemed to be a significant subsidiary (as such term is defined in Rule 405 under the Securities Act).

        Any certificate signed by any officer of any MarkWest Party and delivered to the Representatives or to counsel for the Underwriters shall be deemed a representation and warranty by such MarkWest Party to each Underwriter as to the matters covered thereby.

        2.     Purchase of the Units by the Underwriters.     On the basis of the representations and warranties contained in, and subject to the terms and conditions of, this Agreement, the Partnership agrees to sell the Firm Units to the several Underwriters, and each of the Underwriters, severally and not jointly, agrees to purchase the number of Firm Units set forth opposite that Underwriter's name in Schedule 1 hereto.

        In addition, the Partnership grants to the Underwriters an option to purchase up to 750,000 Option Units exercisable in the event that the Underwriters sell more Common Units than the number of Firm Units in the offering and as set forth in Section 4 hereof. Each Underwriter agrees, severally and not jointly, to purchase the number of Option Units (subject to such adjustments to eliminate fractional Common Units as the Representatives may determine) that bears the same proportion to the total number of Option Units to be sold on such Delivery Date as the number of Firm Units set forth in Schedule 1 hereto opposite the name of such Underwriter (as such number may be increased pursuant to Section 9) bears to the total number of Firm Units.

        The price of both the Firm Units and any Option Units purchased by the Underwriters shall be $29.904 per Unit.

        The Partnership shall not be obligated to deliver any of the Firm Units or Option Units to be delivered on the applicable Delivery Date, except upon payment for all such Units to be purchased on such Delivery Date as provided herein.

        3.     Offering of Units by the Underwriters.     Upon authorization by the Representatives of the release of the Firm Units, the several Underwriters propose to offer the Firm Units for sale upon the terms and conditions to be set forth in the Prospectus.

        4.     Delivery of and Payment for the Units.     Delivery of and payment for the Firm Units shall be made at 10:00 A.M., New York City time, on the fourth full business day following the date of this Agreement or at such other date or place as shall be determined by agreement between the Representatives and the Partnership. This date and time are sometimes referred to as the " Initial Delivery Date ." Delivery of the Firm Units shall be made to the Representatives for the account of each Underwriter against payment by the several Underwriters through the Representatives of the aggregate purchase price of the Firm Units to or upon the order of the Partnership by wire transfer in immediately available funds to the account or accounts specified by the Partnership. Time shall be of

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the essence, and delivery at the time and place specified pursuant to this Agreement is a further condition of the obligation of each Underwriter hereunder. The Partnership shall deliver the Firm Units through the facilities of DTC unless the Representatives shall otherwise instruct.

        The option granted in Section 2 will expire 30 days after the date of this Agreement and may be exercised in whole or from time to time in part by written notice being given to the Partnership by the Representatives; provided that if such date falls on a day that is not a business day, the option granted in Section 2 will expire on the next succeeding business day. Such notice shall set forth the aggregate number of Option Units as to which the option is bei


 
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