Document:

EX-10.2

 Exhibit 10.2 
 EXECUTION VERSION 
 VOTING AGREEMENT 

BY AND AMONG 
 INERGY, L.P., 
 INERGY MIDSTREAM, L.P., 

NRGM GP, LLC, 
 AND 
 INTREPID MERGER SUB, LLC 

AND 

CRESTWOOD GAS SERVICES GP LLC, 
 CRESTWOOD GAS SERVICES HOLDINGS LLC, 
 AND 

CRESTWOOD HOLDINGS LLC 
 AND 
 CRESTWOOD MIDSTREAM PARTNERS LP 

Dated as of May 5, 2013 

 VOTING AGREEMENT 

This VOTING AGREEMENT, dated as of May 5, 2013 (this “Agreement”), is entered into by and among Inergy,
L.P., a Delaware limited partnership (“NRGY”), Inergy Midstream, L.P., a Delaware limited partnership (“NRGM”), NRGM GP, LLC, a Delaware limited liability company and the general partner of NRGM
(“NRGM GP”), Intrepid Merger Sub, LLC, a Delaware limited liability company and wholly-owned subsidiary of NRGM (“Merger Sub” and, collectively with NRGY, NRGM and NRGM GP, the “Inergy
Parties”), on the one hand, and Crestwood Gas Services GP LLC, a Delaware limited liability company (“CMLP GP”), Crestwood Gas Services Holdings LLC, a Delaware limited liability company (“CW Gas
Holdings”) and Crestwood Holdings LLC, a Delaware limited liability company (“CW Holdings” and, collectively with CMLP GP and CW Gas Holdings, the “Crestwood Parties”), and Crestwood
Midstream Partners LP, a Delaware limited partnership (“CMLP”). 
 W I T N E S S E T H:

 WHEREAS, concurrently with the execution of this Agreement, the Inergy Parties, CMLP, CMLP GP, the general partner of
CMLP, and CW Holdings, are entering into an Agreement and Plan of Merger, dated as of the date hereof (as amended, supplemented, restated or otherwise modified from time to time, the “Merger Agreement”) pursuant to which,
among other things, Merger Sub will merge with and into CMLP (the “Merger”) with CMLP as the surviving entity; and 
 WHEREAS, as of the date hereof, the Crestwood Parties are the Holders of the CMLP Units set forth on Schedule A hereto (the “Existing Units” and, together with any
additional CMLP Units pursuant to Section 4.3 hereof, the “Subject Units”); and 
 WHEREAS,
in connection with the Merger Agreement, the Inergy Parties have requested that the Crestwood Parties enter into this Agreement and abide by the covenants and obligations set forth herein, and CMLP has also requested that the Crestwood Parties abide
by certain of the covenants and obligations set forth herein. 
 NOW THEREFORE, in consideration of the premises and the
respective representations, warranties, covenants, agreements and conditions contained herein, the parties hereto agree as follows: 
 ARTICLE 1 
 GENERAL 

1.1 Defined Terms. The following capitalized terms, as used in this Agreement, shall have the meanings set forth below.
Capitalized terms used but not otherwise defined herein shall have the meanings ascribed to them in the Merger Agreement. 

“Agreement” shall have the meaning set forth in the preamble. 

“CMLP” shall have the meaning set forth in the recitals. 

“CMLP Class D Units” shall mean the Class D units representing limited partner interests in CMLP issued pursuant
to the CMLP Partnership Agreement. 

  
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 “CMLP Common Units” shall mean the common units representing limited
partner interests in CMLP issued pursuant to the CMLP Partnership Agreement. 
 “CMLP GP” shall have the
meaning set forth in the preamble. 
 “CMLP Limited Partners” shall have the meaning set forth in
Section 2.1 of this Agreement. 
 “CMLP Partnership Agreement” shall mean the Second Amended
and Restated Agreement of Limited Partnership of CMLP dated as of February 19, 2008, as amended from time to time. 

“CMLP Units” shall mean the CMLP Common Units and the CMLP Class D Units. 

“Crestwood Parties” shall have the meaning set forth in the preamble. 

“CW Gas Holdings” shall have the meaning set forth in the preamble. 

“CW Holdings” shall have the meaning set forth in the preamble. 

“Exchange Act” shall mean the Securities Exchange Act of 1934, as amended, and the rules and regulations
promulgated thereunder. 
 “Existing Units” shall have the meaning set forth in the recitals.

 “Grantee” shall have the meaning set forth in Section 2.3 of this Agreement. 

“Inergy Parties” shall have the meaning set forth in the preamble. 

“Lien” shall mean any mortgage, lien, charge, restriction (including restrictions on transfer), pledge, security
interest, option, right of first offer or refusal, preemptive right, lease or sublease, claim, right of any third party, covenant, right of way, easement, encroachment or encumbrance. 

“Merger” shall have the meaning set forth in the recitals. 

“Merger Agreement” shall have the meaning set forth in the recitals. 

“Merger Sub” shall have the meaning set forth in the preamble. 

“NRGM” shall have the meaning set forth in the preamble. 

“NRGM GP” shall have the meaning set forth in the preamble. 

“NRGY” shall have the meaning set forth in the preamble. 

“Permitted Transfer” means (i) any Transfer of Subject Units by a Crestwood Party to another Crestwood Party
or any other Affiliate of a Crestwood Party that is a party hereto or that agrees in a writing reasonably satisfactory to the Inergy Parties to be bound and subject to the terms and provisions hereof to the same extent as the Crestwood Parties and
(ii) any pledge of Subject Units in connection with any credit facility now in existence or which may in the future be obtained by a Crestwood Party in connection with the transactions contemplated by the

  
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Merger Agreement, MLP GP Contribution Agreement or NRGY GP Purchase Agreement and any Transfer of such Subject Units upon the foreclosure thereof by any lender under any such credit facility.

 “Subject Units” shall have the meaning set forth in the recitals. 

“Transfer” shall mean, directly or indirectly, to sell, transfer, assign, pledge, encumber, grant a participation
in, gift-over, hypothecate or otherwise dispose of (by merger (including by conversion into securities or other consideration), by tendering into any tender or exchange offer, by liquidation, by dissolution, by dividend, by distribution, by
operation of law or otherwise), either voluntarily or involuntarily, or to enter into any contract, option or other arrangement or understanding with respect to the voting of or sale, transfer, assignment, pledge, encumbrance, grant, gift,
hypothecation or other disposition of (by merger, by tendering into any tender or exchange offer, by testamentary disposition, by interspousal disposition pursuant to domestic relations proceeding, by liquidation, by dissolution, by dividend, by
distribution, by operation of Law or otherwise). 
 ARTICLE 2 

VOTING 

2.1 Agreement to Vote Subject Units. Each of the Crestwood Parties hereby irrevocably and unconditionally agrees that, at
any meeting of the Limited Partners (as defined in the CMLP Partnership Agreement, the “CMLP Limited Partners”), however called, including any adjournment or postponement thereof, and in connection with any written consent of
the CMLP Limited Partners, it shall, to the fullest extent that such Crestwood Party’s Subject Units are entitled to vote thereon or consent thereto: 
 (a) appear at each such meeting, in person or by proxy, or otherwise cause its Subject Units to be counted as present thereat for purposes of calculating a quorum; and 

(b) vote (or cause to be voted), in person or by proxy, or deliver (or cause to be delivered) a written consent covering, all of the
Subject Units (i) in favor of the adoption of the Merger Agreement and any transactions contemplated by the Merger Agreement, submitted for the vote or written consent of the CMLP Limited Partners; (ii) against any action, agreement or
transaction that would result in a breach of any covenant, representation or warranty or any other obligation or agreement of CMLP or CMLP GP or any of their Subsidiaries contained in the Merger Agreement; and (iii) against any action,
agreement or transaction that would impede, interfere with, delay, postpone, discourage, prevent, nullify, frustrate the purposes of, be in opposition to or in competition or inconsistent with, or materially and adversely affect the Merger or any of
the transactions contemplated by the Merger Agreement. 
 2.2 No Inconsistent Agreements. Each of the Crestwood
Parties hereby represents, covenants and agrees that, except for this Agreement, it (a) has not entered into, and, during the term of this Agreement, will not enter into, any voting agreement or voting trust with respect to its Subject Units;
(b) has not granted, and shall not grant at any time while this Agreement remains in effect, a proxy, consent or power of attorney with respect to the voting of its Subject Units (except as contemplated by Section 2.1 or Section 2.3);
and (c) has not taken and, during the term of this Agreement, will not knowingly take any action that would make any representation or warranty of such Crestwood Party contained herein untrue or incorrect in any material respect or have the
effect of preventing or disabling such Crestwood Party from performing any of its obligations under this Agreement. 

  
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 2.3 Proxy. In order to secure the obligations set forth herein, during the
term of this Agreement, each of the Crestwood Parties hereby irrevocably appoints Laura Ozenberger and Michael K. Post (collectively, the “Grantees”), and each of them individually, as its proxy and attorney-in-fact (with
full power of substitution), for and in the name, place and stead of the Crestwood Parties, to vote or execute written consents with respect to the Subject Units in accordance with Section 2.1 hereof and, in the discretion of the
Grantees, with respect to any proposed postponements or adjournments of any meeting of the CMLP Limited Partners at which any of the matters described in Section 2.1 are to be considered; provided that, notwithstanding the grant of this
irrevocable proxy, the Crestwood Parties may vote in accordance with Section 2.1 and in favor of any adjournment that is not prohibited by the Merger Agreement, by proxy or otherwise. Each of these proxies is coupled with an interest and shall
be irrevocable, except upon termination of this Agreement, and each of the Crestwood Parties shall take such further action or execute such other instruments as may be reasonably necessary to effectuate the intent of such Crestwood Party’s
proxy and hereby revokes any proxy previously granted by it with respect to the Subject Units. 
 ARTICLE 3 

REPRESENTATIONS AND WARRANTIES 
 Each of the Crestwood Parties hereby represents and warrants to the Inergy Parties as follows: 
 3.1 Organization; Authorization; Validity of Agreement; Necessary Action. Each of the Crestwood Parties is a limited liability company, duly formed, validly existing and in good standing
under the Laws of the State of Delaware and has the requisite limited liability company power and authority to execute, deliver and perform its obligations hereunder and to consummate the transactions contemplated hereby, and no other actions or
proceedings on the part of any of the Crestwood Parties to authorize the execution and delivery of this Agreement, the performance by it of the obligations hereunder or the consummation of the transactions contemplated hereby are required. This
Agreement has been duly executed and delivered by each of the Crestwood Parties and, assuming the due execution and delivery of this Agreement by the Inergy Parties and CMLP, constitutes a valid and binding agreement of each of the Crestwood
Parties, enforceable against each of the Crestwood Parties by the Inergy Parties or by CMLP in accordance with its terms (except as such enforceability may be limited by applicable bankruptcy, insolvency, reorganization, moratorium, fraudulent
transfer and similar Laws of general applicability relating to or affecting creditors’ rights or by general equity principles (regardless of whether such enforceability is considered in a proceeding in equity or at law)). 

3.2 Ownership. As of the date hereof, each of the Crestwood Parties is the holder of the number of Existing Units as set
forth on Schedule A hereto. Except for shared voting power solely for SEC reporting purposes as set forth in the Schedule 13D filed by the Crestwood Parties with the SEC prior to the date hereof and except as a result of making a Permitted
Transfer or as required pursuant to Section 2.1 hereof, each of the Crestwood Parties has and will have at all times through the Closing Date sole voting power (including the right to control such vote as contemplated herein), sole power of
disposition, sole power to issue instructions with respect to the matters set forth in Article 2 hereof, and sole power to agree to all of the matters set forth in this Agreement, in each case with respect to all of such Crestwood
Party’s Subject Units. 

  
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 3.3 No Violation. Neither the execution, delivery or performance of this
Agreement by any of the Crestwood Parties nor the performance by any of the Crestwood Parties of its obligations under this Agreement will (i) result in a violation or breach of or conflict with any provisions of, or result in a default (or an
event that, with notice or lapse of time or both, would become a default) under, or result in the termination, cancellation of, or give rise to a right of purchase under, or accelerate the performance required by, or result in a right of termination
or acceleration under, or result in the creation of any Lien (except as set forth in this Agreement and pursuant to any applicable restrictions on transfer under the Exchange Act) upon any of the Subject Units or any material properties, rights or
assets, or result in being declared void, voidable, or without further binding effect, or otherwise result in a detriment to it under any of the terms, conditions or provisions of any note, bond, mortgage, indenture, deed of trust, license,
franchise, lease, contract, agreement, joint venture or other instrument or obligation of any kind to which any of the Crestwood Parties or any of their respective Subsidiaries is a party or by which any of the Crestwood Parties’ or any of
their respective Subsidiaries’ respective properties, rights or assets may be bound; (ii) violate any Orders or Laws applicable to any of the Crestwood Parties or any of its properties, rights or assets; or (iii) result in a violation
or breach of or conflict with the organizational documents of any of the Crestwood Parties. 
 3.4 Consents and
Approvals. No Order, or registration, declaration or filing with, any Governmental Entity is necessary to be obtained or made by any of the Crestwood Parties in connection with (i) the execution, delivery and performance of this
Agreement or (ii) the consummation by the Crestwood Parties of the transactions contemplated hereby, except for any reports under the Exchange Act as may be required in connection with this Agreement and the transactions contemplated hereby.

 3.5 Reliance by Inergy Parties and CMLP. Each of the Crestwood Parties understands and acknowledges that the
Inergy Parties and CMLP are entering into the Merger Agreement in reliance upon the execution and delivery of this Agreement and the representations, warranties, covenants and obligations of the Crestwood Parties contained herein. 

ARTICLE 4 

OTHER COVENANTS 
 4.1 Non-Solicitation. The Crestwood Parties shall not, and shall cause their controlled Affiliates and shall use their reasonable best efforts to cause their Representatives not to, directly
or indirectly, initiate, solicit or knowingly encourage (including by way of furnishing confidential information) any third Person to make an MLP Takeover Proposal or assist any third Person in preparing or soliciting an offer relating in any way to
an MLP Takeover Proposal; provided, however, that any Crestwood Party, including in its capacity as record or beneficial owner of any Subject Units, and any Affiliate or Representative of any of the Crestwood Parties, may take the actions described
in this Section 4.1 at any time that CMLP and CMLP GP are permitted by the terms of Section 6.5 of the Merger Agreement to take such actions. 
 4.2 Prohibition on Transfers, Other Actions. Each of the Crestwood Parties hereby agrees not to (a) Transfer any of the Subject Units, unless such Transfer is a Permitted Transfer;
(b) enter into any agreement, arrangement or understanding, or take any other action, that 

  
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violates or conflicts with or would reasonably be expected to violate or conflict with, or result in or give rise to a violation of or conflict with, such Crestwood Party’s representations,
warranties, covenants and obligations under this Agreement; or (c) take any action that could restrict or otherwise affect such Crestwood Party’s legal power, authority and right to comply with and perform its covenants and obligations
under this Agreement. Any Transfer in violation of this provision shall be null and void. 
 4.3 Changes to Subject
Units. Each of the Crestwood Parties agrees that all CMLP Units that such Crestwood Party purchases, acquires the right to vote or otherwise acquires beneficial ownership of (as defined in Rule 13d-3 under the Exchange Act) after the
execution of this Agreement shall be subject to the terms of this Agreement and shall constitute “Subject Units” for all purposes of this Agreement. In the event of a unit split, unit distribution or any change in the CMLP Units by reason
of any split-up, reverse unit split, recapitalization, combination, reclassification, exchange of units or the like, the term “Subject Units” shall be deemed to refer to and include such CMLP Units as well as all such distributions and any
securities of CMLP into which or for which any or all of such CMLP Units may be changed or exchanged or which are received in such transaction. 
 4.4 Further Assurances. From time to time, at the request of any of the Inergy Parties and without further consideration, each of the Crestwood Parties shall execute and deliver, or cause to
be executed and delivered, such instruments of endorsement, direction or authorization as may be necessary, and take all such further action as may be reasonably necessary or advisable, to consummate and make effective the transactions contemplated
by this Agreement. 
 4.5 Standstill. Other than as contemplated in the MLP GP Contribution Agreement and the
Merger Agreement and other than as a result of distributions of additional CMLP Class D Units issued in kind to the Holders of CMLP Class D Units and the holder of the CMLP Incentive Distribution Rights in accordance with the CMLP Partnership
Agreement, from and after the date hereof and prior to the MLP Unitholder Approval having been obtained, none of the Crestwood Parties, nor any of their respective controlled Affiliates, shall acquire beneficial ownership of any additional CMLP
Units. 
 ARTICLE 5 
 MISCELLANEOUS 
 5.1 Termination. This Agreement shall remain
in effect until the earliest to occur of (a) the Effective Time; (b) the termination of the Merger Agreement in accordance with its terms (including after any extension thereof); (c) the Drop Dead Date; (d) the making of any
change, by amendment, waiver (other than waivers by the Inergy Parties of any of their rights), or other modification, by any party, to any provision of the Merger Agreement that is adverse to any of the Crestwood Parties, in each case in this
clause (d) without the prior written consent of the Crestwood Parties; and (e) the mutual written agreement of each of the Crestwood Parties, CMLP and the Inergy Parties to terminate this Agreement. Upon the occurrence of any such event,
this Agreement shall automatically terminate without any notice or further action from the parties hereto and be of no further force or effect. Nothing in this Section 5.1 and no termination of this Agreement shall relieve or otherwise
limit any party of liability for any breach of this Agreement occurring prior to such termination. Notwithstanding the foregoing, the right of CMLP to enforce Article II of this Agreement shall also terminate at such time as the MLP Conflicts
Committee effects an MLP Recommendation Change. 

  
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 5.2 No Ownership Interest. Nothing contained in this Agreement shall be deemed
to vest in any of the Inergy Parties any direct or indirect ownership or incidence of ownership of or with respect to any Subject Units. All rights, ownership and economic benefit relating to the Subject Units shall remain vested in and belong to
the Crestwood Parties, and the Inergy Parties shall have no authority to direct the Crestwood Parties in the voting or disposition of any of the Subject Units, except as otherwise provided herein. 

5.3 Publicity. Each of the Crestwood Parties hereby permits the Inergy Parties and CMLP to include and disclose in the
Proxy Statement/Prospectus and in such other schedules, certificates, applications, agreements or documents as such entities reasonably determine to be necessary or appropriate in connection with the consummation of the Merger and the transactions
contemplated by the Merger Agreement, the identity of each of the Crestwood Parties, the ownership of the Subject Units by each of the Crestwood Parties and the nature of the commitments, arrangements and understandings of each the Crestwood Parties
pursuant to this Agreement. 
 5.4 Notices. Any notice, request, instruction, correspondence or other document to
be given hereunder to a party shall be in writing and delivered in person or by courier service requiring acknowledgment of receipt of delivery or mailed by U.S. registered or certified mail, postage prepaid and return receipt requested, or by
telecopier, as follows; provided, however, that copies to be delivered below shall not be required for effective notice and shall not constitute notice: 
 If to any of the Inergy Parties, to: 
 Inergy Midstream, L.P.

 2 Brush Creek Boulevard, Suite 200 

Kansas City, Missouri 64112 
 Attention: General Counsel 
 Facsimile: (816) 531-4680

 and 
 Inergy, L.P. 
 Two Brush Creek Boulevard, Suite 200 

Kansas City, Missouri 64112 
 Attention: General Counsel 
 Facsimile: (816) 531-4680

 With a copy to (which shall not constitute notice): 

Vinson & Elkins LLP 
 1001 Fannin Street, Suite 2500 
 Houston, Texas 77002 

Attention: Mike Rosenwasser and Gillian A. Hobson 

Facsimile: (713) 615-5794 

  
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 and 

Conflicts Committee of the Board of Directors 

Inergy Midstream, L.P. 
 Two Brush Creek Boulevard, Suite 200 
 Kansas City, Missouri 64112

 Attention: Randy E. Moeder, Chairman of the Conflicts Committee 

Facsimile: (405) 286-9192 
 and 
 Potter Anderson & Corroon LLP 

1313 North Market Street 
 P.O. Box 951 
 Wilmington, DE 19899-0951 

Attention: Thomas A. Mullen 
 Facsimile: (302) 778-6204 
 If to any of the Crestwood Parties, to:

 Crestwood Holdings LLC 

700 Louisiana Street, Suite 2060 
 Houston, Texas 77002 
 Attention: Robert G. Phillips 

Facsimile: 832-519-2250 
 With a copy to (which shall not constitute notice): 
 Simpson
Thacher & Bartlett LLP 
 425 Lexington Avenue 

New York, New York 10017 
 Attention: William E. Curbow 
 Facsimile: 212-455-2502 

If to CMLP, to: 
 Crestwood Midstream Partners L.P. 
 Crestwood Gas Services GP LLC

 700 Louisiana Street, Suite 2060 

Houston, Texas 77002 
 Attention: Robert G. Phillips 
 Facsimile: 832-519-2250 

With copies to (which shall not constitute notice): 

Simpson Thacher & Bartlett LLP 

425 Lexington Avenue 
 New York, New York 10017 
 Attention: William E. Curbow 

Facsimile No.: 212-455-2502 

  
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 and 

Conflicts Committee of the Board of Directors 

Crestwood Gas Services GP LLC 
 700 Louisiana Street, Suite 2060 
 Houston, Texas 77002 

Attention: Philip D. Gettig, Chairman of the Conflicts Committee 

and 
 Morris, Nichols, Arsht & Tunnell LLP 
 1201 N. Market
Street 
 Wilmington, Delaware 19801 

Attention: Louis G. Hering 
 Facsimile: (302) 425-4662 
 Notice given by personal delivery, courier service or mail shall
be effective upon actual receipt. Notice given by telecopier shall be confirmed by appropriate answer back and 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 by telecopier shall be confirmed promptly after transmission in writing by certified mail or personal delivery. Any Party
may change any address to which Notice is to be given to it by giving Notice as provided above of such change of address. 
 5.5
Interpretation. The division of this Agreement into articles, sections and other portions and the insertion of headings are for convenience of reference only and shall not affect the construction or interpretation hereof. Unless
otherwise indicated, all references to an “Article” or “Section” refer to the specified Article or Section of this Agreement. The terms “this Agreement,” “hereof,” “herein” and “hereunder”
and similar expressions refer to this Agreement and not to any particular Article, Section, or other portion hereof. Unless otherwise specifically indicated or the context otherwise requires, (a) words importing the singular shall include the
plural and vice versa and words importing any gender shall include all genders and (b) “include,” “includes” and “including” as used in this Agreement shall be deemed to be followed by the words “without
limitation.” The parties have participated jointly in the negotiation and drafting of this Agreement. In the event an ambiguity or question of intent or interpretation arises, it is the intention of the parties that this Agreement shall be
construed as if drafted jointly by the parties and no presumption or burden of proof shall arise favoring or disfavoring any Person by virtue of the authorship of any of the provisions of this Agreement. 

5.6 Entire Understanding. This Agreement (including the documents referred to or listed herein and the schedules annexed
hereto) and, solely to the extent of the defined terms referenced herein, the Merger Agreement, constitute the entire agreement between and among the parties pertaining to the subject matter hereof and supersede all prior agreements, understandings,
negotiations and discussions, whether oral or written, of the parties, and there are no representations, warranties or other agreements between or among the parties in connection with the subject matter hereof except as set forth specifically herein
or contemplated hereby. 

  
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 5.7 Successors and Assigns; No Third-Party Beneficiaries. Neither this
Agreement nor any of the rights or obligations of any party under this Agreement shall be assigned, in whole or in part (by operation of Law or otherwise), by any party without the prior written consent of the other parties hereto. Any assignment in
violation of this provision shall be null and void. Subject to the foregoing, this Agreement shall bind and inure to the benefit of the parties hereto and their respective successors and permitted assigns. Nothing in this Agreement, expressed or
implied, is intended to confer upon any Person, other than the parties hereto or their respective successors and permitted assigns, any rights, remedies, obligations or liabilities under or by reason of this Agreement. 

5.8 Counterparts. This Agreement may be executed in multiple counterparts each of which shall be deemed an original and all
of which shall constitute one instrument. Delivery of an executed signature page of this Agreement by facsimile or other customary means of electronic transmission (e.g., “pdf”) shall be effective as delivery of a manually executed
counterpart hereof. 
 5.9 Severability. If any term or other provision of this Agreement is invalid, illegal or
incapable of being enforced by any rule of applicable Law, or public policy, all other conditions and provisions of this Agreement shall nevertheless remain in full force and effect so long as the economic or legal substance of the transactions
contemplated by this Agreement are not affected in any manner materially adverse to any party. Upon such determination that any term or other provision is invalid, illegal or incapable of being enforced, the parties shall negotiate in good faith to
modify this Agreement so as to effect the original intent of the parties as closely as possible in a mutually acceptable manner in order that the transactions contemplated by this Agreement are consummated as originally contemplated to the fullest
extent possible. 
 5.10 Governing Law; Consent to Jurisdiction; Waiver of Jury Trial. 

(a) To the maximum extent permitted by applicable Laws, the provisions of this Agreement shall be governed by and construed and enforced
in accordance with the laws of the State of Delaware, without regard to principles of conflicts of law. 
 (b) Each of the
parties irrevocably and unconditionally confirms and agrees that it is and shall continue to be (i) subject to the jurisdiction of the courts of the State of Delaware and of the federal courts sitting in the State of Delaware and
(ii) subject to service of process in the State of Delaware. Each Party hereby irrevocably and unconditionally (A) consents and submits to the exclusive jurisdiction of any federal or state court located in the State of Delaware, including
the Delaware Court of Chancery in and for New Castle County for any actions, suits or proceedings arising out of or relating to this Agreement or the transactions contemplated by this Agreement (and agrees not to commence any litigation relating
thereto except in such courts); (B) waives any objection to the laying of venue of any such litigation in the Delaware Courts and agrees not to plead or claim in any Delaware Court that such litigation brought therein has been brought in any
inconvenient forum; and (C) acknowledges and agrees that any controversy which may arise under this Agreement is likely to involve complicated and difficult issues, and therefore each such party hereby irrevocably and unconditionally waives any
right such party may have to a trial by jury in respect of any litigation directly or indirectly arising or relating to this Agreement or the transactions contemplated by this Agreement. 

5.11 No Recourse. This Agreement may only be enforced against, and any claims or causes of action that may be based upon,
arise out of or relate to this Agreement, or the 

  
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negotiation, execution or performance of this Agreement may only be made against, the entities that are expressly identified as parties hereto, and no past, present or future Affiliate,
Representative, partner or stockholder of any party hereto shall have any liability for any obligations or liabilities of the parties to this Agreement or for any claim based on, in respect of, or by reason of, the transactions contemplated hereby.

 5.12 Remedies. The parties acknowledge and agree that an award of money damages would be inadequate for any
breach of this Agreement by any party and any such breach would cause the non-breaching parties irreparable harm. Accordingly, the parties agree that prior to the termination of this Agreement, in the event of any breach or threatened breach of this
Agreement by one of the parties, the parties shall also be entitled, without the requirement of posting a bond or other security, to equitable relief, including injunctive relief and specific performance. Such remedies shall not be the exclusive
remedies for any breach of this Agreement but shall be in addition to all other remedies available at law or equity to each of the parties. 
 5.13 Amendment; Waiver. This Agreement may not be amended except by an instrument in writing signed by each of the parties. The failure of a Party to exercise any right or remedy shall not
be deemed or constitute a waiver of such right or remedy in the future. No waiver of any of the provisions of this Agreement shall be deemed or shall constitute a waiver of any other provision hereof (regardless of whether similar), nor shall any
such waiver constitute a continuing waiver unless otherwise expressly provided. Only actions, waivers or consents by NRGM or NRGM GP with the prior written consent of the Buyer Special Committee shall constitute an action, waiver or consent by
either NRGM or NRGM GP as a party hereto, and the Buyer Special Committee shall be entitled to exercise all rights of the Inergy Parties under this Agreement. Only actions, waivers or consents by CMLP with the prior written consent of the MLP
Conflicts Committee shall constitute an action, waiver or consent by CMLP as a party hereto. 
 5.14 Limited Partner
Capacity. Other than with respect to its obligations under Section 4.5 hereof, CMLP GP is signing and entering into this Agreement solely in its capacity as a record owner of Subject Units, and nothing else herein shall limit or affect
in any way any actions that may be hereafter taken by CMLP GP in its capacity as a general partner of CMLP or in any other capacity (but only in such other capacity if such actions are permitted to be taken pursuant to Section 4.1) and no such
actions shall be deemed to be a breach of this Agreement. Nothing contained in this Agreement will restrict, limit, prohibit or preclude CMLP GP from exercising or discharging his or her fiduciary duties as a general partner of CMLP under applicable
law. 
 [Remainder of this page intentionally left blank] 

  
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 IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the date first
above written. 
  

			
	INERGY, L.P.
		
	By:	 	Inergy GP, LLC, its General Partner
		
	By:	 	 /s/ John J. Sherman

	Name:	 	John J. Sherman
	Title:	 	Chief Executive Officer
	
	INERGY MIDSTREAM, L.P.
	
	By: NRGM GP, LLC, its General Partner
		
	By:	 	 /s/ John J. Sherman

	Name:	 	John J. Sherman
	Title:	 	Chief Executive Officer
	
	NRGM GP, LLC
		
	By:	 	 /s/ John J. Sherman

	Name:	 	John J. Sherman
	Title:	 	 Chief Executive Officer 

	
	INTREPID MERGER SUB, LLC
		
	By:	 	 /s/ John J. Sherman

	Name:	 	John J. Sherman
	Title:	 	Chief Executive Officer

  

SIGNATURE PAGE TO VOTING AGREEMENT 

			
	CRESTWOOD GAS SERVICES GP LLC
		
	By:	 	 /s/ Robert G. Phillips

	Name:	 	 Robert G. Phillips 

	Title:	 	President
	
	CRESTWOOD GAS SERVICES HOLDINGS LLC
		
	By:	 	 /s/ Robert G. Phillips

	Name:	 	Robert G. Phillips
	Title:	 	President
	
	CRESTWOOD HOLDINGS LLC
		
	By:	 	 /s/ Robert G. Phillips

	Name:	 	Robert G. Phillips
	Title:	 	President

  

SIGNATURE PAGE TO VOTING AGREEMENT 

 
			
	CRESTWOOD MIDSTREAM PARTNERS LP
		
	By:	 	Crestwood Gas Services GP, LLC, its General Partner
		
	By:	 	 /s/ Robert G. Phillips

	Name:	 	Robert G. Phillips
	Title:	 	President

  

SIGNATURE PAGE TO VOTING AGREEMENT 

 SCHEDULE A 

Existing Units 
  

			
	 Name
	  	 Ownership

		
	 Crestwood Gas Services GP LLC
	  	137,105 Common Units
		
	 Crestwood Gas Services Holdings LLC
	  	6,190,469 Class D Units  

17,210,377 Common Units

		
	 Crestwood Holdings LLC
	  	2,333,712 Common Units

  
 SCHEDULE AEX-10.3

 Exhibit 10.3 
 EXECUTION VERSION 
 OPTION AGREEMENT 

BY AND AMONG 
 INERGY, L.P., 
 INERGY MIDSTREAM, L.P., 

NRGM GP, LLC, 
 AND 
 INTREPID MERGER SUB, LLC 

AND 

CRESTWOOD GAS SERVICES GP LLC, 
 CRESTWOOD GAS SERVICES HOLDINGS LLC, 
 AND 

CRESTWOOD HOLDINGS LLC 
 Dated as of May 5, 2013 

 OPTION AGREEMENT 

This OPTION AGREEMENT, dated as of May 5, 2013 (this “Agreement”), is entered into by and among Inergy,
L.P., a Delaware limited partnership (“NRGY”), Inergy Midstream, L.P., a Delaware limited partnership (“NRGM”), NRGM GP, LLC, a Delaware limited liability company and the general partner of NRGM
(“NRGM GP”), Intrepid Merger Sub, LLC, a Delaware limited liability company and wholly-owned subsidiary of NRGM (“Merger Sub” and, collectively with NRGY, NRGM and NRGM GP, the “Inergy
Parties”), on the one hand, and Crestwood Gas Services GP LLC, a Delaware limited liability company (“CMLP GP”), Crestwood Gas Services Holdings LLC, a Delaware limited liability company (“CW Gas
Holdings”) and Crestwood Holdings LLC, a Delaware limited liability company (“CW Holdings” and, collectively with CMLP GP and CW Gas Holdings, the “Crestwood Parties”). 

W I T N E S S E T H: 
 WHEREAS, concurrently with the execution of this Agreement, the Inergy Parties, Crestwood Midstream Partners LP, a Delaware limited partnership (“CMLP”), and CMLP GP, the general
partner of CMLP, are entering into an Agreement and Plan of Merger, dated as of the date hereof (as amended, supplemented, restated or otherwise modified from time to time, the “Merger Agreement”) pursuant to which, among
other things, Merger Sub will merge with and into CMLP (the “Merger”) with CMLP as the surviving entity; 
 WHEREAS, concurrently with the execution of this Agreement, the Inergy Parties and the Crestwood Parties are entering into a Voting Agreement, dated as of the date hereof (as amended, supplemented,
restated or otherwise modified from time to time, the “Voting Agreement”) pursuant to which, among other things, each of CW Gas Holdings and CW Holdings agrees to support the Merger and the other transactions contemplated
thereby, on the terms and subject to the conditions provided for in the Voting Agreement; 
 WHEREAS, as of the date hereof, the
Crestwood Parties are the Holders of the CMLP Units set forth on Schedule A hereto (such CMLP Units other than any such CMLP Units that are contributed to NRGY pursuant to the Follow-On Contribution Agreement, the “Subject
Units”); and 
 WHEREAS, in connection with the Merger Agreement and the Voting Agreement, the Inergy Parties have
requested that the Crestwood Parties enter into this Agreement and abide by the covenants and obligations set forth herein. 

NOW THEREFORE, in consideration of the premises and the respective representations, warranties, covenants, agreements and conditions
contained herein, the Parties hereto agree as follows: 
 ARTICLE 1 

GENERAL 

1.1 Defined Terms. The following capitalized terms, as used in this Agreement, shall have the meanings set forth below.
Capitalized terms used but not otherwise defined herein shall have the meanings ascribed to them in the Merger Agreement. 

  
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 “Agreement” shall have the meaning set forth in the preamble.

 “Assignment and Assumption Agreement” shall have the meaning set forth in
Section 2.3(a)(i). 
 “CMLP” shall have the meaning set forth in the recitals. 

“CMLP Class D Units” shall mean the Class D units representing limited partner interests in CMLP issued pursuant
to the CMLP Partnership Agreement. 
 “CMLP Common Units” shall mean the common units representing
limited partner interests in CMLP issued pursuant to the CMLP Partnership Agreement. 
 “CMLP GP” shall
have the meaning set forth in the preamble. 
 “CMLP Partnership Agreement” shall mean the Second
Amended and Restated Agreement of Limited Partnership of CMLP dated as of February 19, 2008, as amended from time to time. 

“CMLP Units” shall mean the CMLP Common Units and the CMLP Class D Units. 

“Crestwood Parties” shall have the meaning set forth in the preamble. 

“CW Gas Holdings” shall have the meaning set forth in the preamble. 

“CW Holdings” shall have the meaning set forth in the preamble. 

“Exchange Act” shall mean the Securities Exchange Act of 1934, as amended, and the rules and regulations
promulgated thereunder. 
 “Exercise Date” shall have the meaning set forth in Section 2.2.

 “Exercise Notice” shall have the meaning set forth in Section 2.2. 

“Exchange Ratio” means 1.0700. 
 “Existing Units” shall have the meaning set forth in the recitals. 
 “Follow On Contribution Agreement” means the Follow-On Contribution Agreement, dated as of the date hereof, among NRGY, NRGY General Partner, CW Gas
Holdings and CW Holdings. 
 “Inergy Parties” shall have the meaning set forth in the preamble.

 “Lien” shall mean any mortgage, lien, charge, restriction (including restrictions on transfer),
pledge, security interest, option, right of first offer or refusal, preemptive right, lease or sublease, claim, right of any third party, covenant, right of way, easement, encroachment or encumbrance. 

“Merger” shall have the meaning set forth in the recitals. 

  
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 “Merger Agreement” shall have the meaning set forth in the recitals.

 “Merger Sub” shall have the meaning set forth in the preamble. 

“New NRGM Common Units” shall have the meaning set forth in Section 2.3(b). 

“NRGM” shall have the meaning set forth in the preamble. 

“NRGM Common Units” shall mean common units representing limited partner interests in NRGM issued pursuant to the
NRGM Partnership Agreement. 
 “NRGM GP” shall have the meaning set forth in the preamble. 

“NRGM Partnership Agreement” shall mean means the First Amended and Restated Agreement of Limited Partnership of
NRGM dated as of December 21, 2011, as amended from time to time. 
 “NRGY” shall have the meaning
set forth in the preamble. 
 “Option” shall have the meaning set forth in Section 2.1.

 “Parties” means the Inergy Parties and the Crestwood Parties. 

“Permitted Transfer” shall have the meaning set forth in the Voting Agreement. 

“Record Holder” shall have the meaning set forth in the CMLP Partnership Agreement. 

“Subject Units” shall have the meaning set forth in the recitals. 

“Transfer” shall mean, directly or indirectly, to sell, transfer, assign, pledge, encumber, grant a participation
in, gift-over, hypothecate or otherwise dispose of (by merger (including by conversion into securities or other consideration), by tendering into any tender or exchange offer, by liquidation, by dissolution, by dividend, by distribution, by
operation of law or otherwise), either voluntarily or involuntarily, or to enter into any contract, option or other arrangement or understanding with respect to the voting of or sale, transfer, assignment, pledge, encumbrance, grant, gift,
hypothecation or other disposition of (by merger, by tendering into any tender or exchange offer, by testamentary disposition, by interspousal disposition pursuant to domestic relations proceeding, by liquidation, by dissolution, by dividend, by
distribution, by operation of Law or otherwise). 
 “Transfer Agent” shall have the meaning set forth in
the CMLP Partnership Agreement. 
 “Unaffiliated Financial Advisor” means a nationally recognized
investment banking firm, other than a firm that has been engaged by or on behalf of any of the Inergy Parties or Crestwood Parties or any of their respective Affiliates or any committee of any of their respective boards in connection with the Merger
Agreement, the MLP GP Contribution Agreement or the NRGY GP Purchase Agreement or any of the transactions contemplated thereby. 

“Voting Agreement” shall have the meaning set forth in the recitals. 

  
 3 

 ARTICLE 2 
 OPTION 
 2.1 Option. Each of the Crestwood Parties hereby
grants to NRGM an irrevocable option to purchase such Crestwood Party’s Subject Units in exchange for New NRGM Common Units on the terms and conditions of this Article 2 (the “Option). 

2.2 Exercise. If the General Partner Transactions have been consummated, following the termination of the Merger
Agreement in accordance with its terms either (i) pursuant to Section 8.4(b) of the Merger Agreement or (ii) pursuant to Section 8.2(c) of the Merger Agreement, but only if immediately prior to the MLP Unitholder’s Meeting
NRGM had the right to terminate the Merger Agreement pursuant to Section 8.4(c) of the Merger Agreement and the MLP Recommendation Change giving rise to such termination right was unrelated to an MLP Takeover Proposal, NRGM may exercise the
Option at any time prior to the termination of this Agreement and in its sole discretion by delivering a notice in accordance with Section 5.3 hereof to each of the Crestwood Parties (the “Exercise Notice”) (the date on
which the Option is exercised, the “Exercise Date”). 
 2.3 Transfer and Exchange. 

 (a) Within ten (10) Business Days of receipt of the Exercise Notice as determined in accordance with Section 5.3
hereof: 
  

	 	(i)	each Crestwood Party shall deliver to NRGM a duly executed counterpart of the assignment and assumption agreement in the form set forth in Exhibit A hereto (the
“Assignment and Assumption Agreement”) in respect of such Crestwood Party’s respective Subject Units; 

  

	 	(ii)	as required by Section 4.5(b) of the CMLP Partnership Agreement, each Crestwood Party shall surrender to CMLP for registration of transfer, and CMLP GP, in
its capacity as general partner of CMLP, shall cause CMLP to acknowledge such surrender and such transfer in connection therewith, every original certificate evidencing any of such Crestwood Party’s respective Subject Units;

  

	 	(iii)	as required by Section 4.5(a) of the CMLP Partnership Agreement, CMLP GP, in its capacity as general partner of CMLP, shall cause its appropriate officers
to execute and deliver to NRGM, and, if necessary, shall cause the Transfer Agent to countersign, new certificates which both (A) name NRGM as the new Holder of the Subject Units and (B) otherwise comply with all applicable provisions of
the CMLP Partnership Agreement (including Section 4.8(f) thereto); 

  

	 	(iv)	as required by Section 10.1(b) of the CMLP Partnership Agreement for a transferee to become a limited partner of CMLP, CMLP GP, in its capacity as general
partner of CMLP, shall cause (A) the transfers of the Subject Units effected in connection with NRGM’s exercise of the Option to be reflected in the books and records of CMLP and (B) NRGM to become the Record Holder of the Subject
Units; and 

  

	 	(v)	the Crestwood Parties shall execute and deliver, or cause to be executed and delivered, any such instruments, and shall take all such actions as may be necessary or
advisable (whether pursuant to the CMLP Partnership Agreement or otherwise) to consummate the Option in respect of all Subject Units and the transactions and requirements contemplated by this Article 2. 

  
 4 

 (b) NRGM agrees that, within one (1) Business Day of receipt of a duly executed
Assignment and Assumption Agreement delivered by an applicable Crestwood Party pursuant to Section 2.3(a)(i) above, NRGM shall (i) issue to each applicable Crestwood Party a number of NRGM Common Units equal to the product (rounded
down to the nearest whole number) of (A) such Crestwood Party’s Subject Units and (B) the Exchange Ratio (such NRGM Common Units described in this clause (i), the “New NRGM Common Units”); (ii) in
lieu of any fractional units which would have otherwise been issued to such applicable Crestwood Party pursuant to the preceding clause (i), pay to the applicable Crestwood Party an amount in cash (without interest rounded up to the nearest
whole cent) equal to the product of (A) such fraction and (B) the average of the closing price of NRGM Common Units on the NYSE Composite Transaction Reporting System as reported in The Wall Street Journal (but subject to correction for
typographical or other manifest errors in such reporting) over the five-day trading period ending on the third trading day immediately preceding the date of the Exercise Notice; (iii) pay to each applicable Crestwood Party an amount equal to
$0.4669 in cash per such Crestwood Party’s Subject Unit; and (iv) deliver to such applicable Crestwood Party a duly executed counterpart of the Assignment and Assumption Agreement. 

(c) Notwithstanding anything in this Agreement to the contrary, NRGM shall only be entitled to exercise the Option provided for herein if
NRGM shall have (i) received an opinion from an Unaffiliated Financial Advisor, dated the date of the Exercise Notice, to the effect that the exercise of the Option in accordance with the terms hereof is fair, from a financial point of view, to
NRGM; and (ii) delivered a copy of such opinion to the Crestwood Parties. Any delivery of any Exercise Notice without compliance with the foregoing requirement shall be null and void and no Crestwood Party shall have any obligation to comply
with Section 2.3 hereof in connection with such Exercise Notice. 
 ARTICLE 3 

REPRESENTATIONS AND WARRANTIES 
 Each of the Crestwood Parties hereby represents and warrants to the Inergy Parties as follows: 
 3.1 Organization; Authorization; Validity of Agreement; Necessary Action. Each of the Crestwood Parties is a limited liability company, duly formed, validly existing and in
good standing under the Laws of the State of Delaware and has the requisite limited liability company power and authority to execute, deliver and perform its obligations hereunder and to consummate the transactions contemplated hereby, and no other
actions or proceedings on the part of any of the Crestwood Parties to authorize the execution and delivery of this Agreement, the performance by it of the obligations hereunder or the consummation of the transactions contemplated hereby are
required. This Agreement has been duly executed and delivered by each of the Crestwood Parties and, assuming the due execution and delivery of this Agreement 

  
 5 

 
by the Inergy Parties, constitutes a valid and binding agreement of each of the Crestwood Parties, enforceable against each of the Crestwood Parties in accordance with its terms (except as such
enforceability may be limited by applicable bankruptcy, insolvency, reorganization, moratorium, fraudulent transfer and similar Laws of general applicability relating to or affecting creditors’ rights or by general equity principles (regardless
of whether such enforceability is considered in a proceeding in equity or at law)). 
 3.2 Ownership. As of the
date hereof, each of the Crestwood Parties is the holder of the number of Existing Units as set forth on Schedule A hereto. Except for shared voting or dispositive power solely for SEC reporting purposes as set forth in the Schedule 13D filed
by the Crestwood Parties with the SEC prior to the date hereof and except as a result of making a Permitted Transfer, as contemplated by the Voting Agreement or as a result of a Transfer of Subject Units in accordance with the Follow-On Contribution
Agreement, each of the Crestwood Parties has and will have at all times through the Exercise Date sole voting power, sole power of disposition, sole power to issue instructions with respect to the matters set forth in Article 2 hereof, and
sole power to agree to all of the matters set forth in this Agreement, in each case with respect to all of such Crestwood Party’s Subject Units at all times through the Exercise Date. 

3.3 No Violation. Neither the execution, delivery or performance of this Agreement by any of the Crestwood Parties nor the
performance by any of the Crestwood Parties of its obligations under this Agreement will (a) result in a violation or breach of or conflict with any provisions of, or result in a default (or an event that, with notice or lapse of time or both,
would become a default) under, or result in the termination, cancellation of, or give rise to a right of purchase under, or accelerate the performance required by, or result in a right of termination or acceleration under, or result in the creation
of any Lien (except as set forth in this Agreement and pursuant to any applicable restrictions on transfer under the Exchange Act) upon any of the Subject Units or any material properties, rights or assets, or result in being declared void,
voidable, or without further binding effect, or otherwise result in a detriment to it under any of the terms, conditions or provisions of any note, bond, mortgage, indenture, deed of trust, license, franchise, lease, contract, agreement, joint
venture or other instrument or obligation of any kind to which any of the Crestwood Parties or any of their respective Subsidiaries is a party or by which any of the Crestwood Parties’ or any of their respective Subsidiaries’ respective
properties, rights or assets may be bound; (b) violate any Orders or Laws applicable to any of the Crestwood Parties or any of its properties, rights or assets; or (c) result in a violation or breach of or conflict with the organizational
documents of any of the Crestwood Parties. 
 3.4 Consents and Approvals. No Order, or registration, declaration
or filing with, any Governmental Entity is necessary to be obtained or made by any of the Crestwood Parties in connection with (a) the execution, delivery and performance of this Agreement or (b) the consummation by the Crestwood Parties
of the transactions contemplated hereby, except for any reports under Sections 13(d) and 16 of the Exchange Act as may be required in connection with this Agreement and the transactions contemplated hereby. 

3.5 Reliance by Inergy Parties. Each of the Crestwood Parties understands and acknowledges that the Inergy Parties are
entering into the Merger Agreement in reliance upon the execution and delivery of this Agreement and the representations, warranties, covenants and obligations of the Crestwood Parties contained herein. 

  
 6 

 3.6 New NRGM Common Units Entirely for Own Account. The New NRGM Common Units
to be acquired by the Crestwood Parties pursuant to Article 2 will be acquired for investment for each respective Crestwood Party’s own account, not as a nominee or agent, and not with a view to the resale or distribution of any part
thereof. No Crestwood Party has the present intention of selling, granting any participation in, or otherwise distributing the same. No Crestwood Party presently has any contract, undertaking, agreement or arrangement with any person to sell,
transfer or grant participation to such person or to any third person, with respect to any of the New NRGM Common Units to be acquired by the Crestwood Parties pursuant to Article 2. 

3.7 Accredited Investor; Investment Experience. Each Crestwood Party is an “accredited investor” within
the meaning of Rule 501 of Regulation D promulgated by the Securities and Exchange Commission pursuant to the Securities Act. Each Crestwood Party is experienced in evaluating and investing in securities and acknowledges that it can bear the
economic risk of a complete loss of its investment in New NRGM Common Units to be acquired by the Crestwood Parties pursuant to Article 2, and has such knowledge and experience in financial and business matters that it is capable of
evaluating the merits and risks of an investment in such New NRGM Common Units. Each Crestwood Party has undertaken such investigation as it has deemed necessary to enable it to make an informed and intelligent decision with respect to the
execution, delivery and performance of this Agreement and any acquisition of New NRGM Common Units pursuant to Article 2. Each Crestwood Party has had an opportunity to ask questions and receive answers from the Inergy Parties regarding the
terms and conditions of the Option and the transactions contemplated by the Option and the business, properties, prospects and financial condition of NRGM. The foregoing two sentences do not, however, modify the representations of the Crestwood
Parties in Article 3. 
 3.8 Restricted Securities. Each Crestwood Party understands that the New NRGM
Common Units to be acquired by the Crestwood Parties pursuant to Article 2 have not been registered under the Securities Act or any state securities Laws by reason of specific exemptions under the provisions thereof, the availability of which
depend in part on the bona fide nature of the Crestwood Parties’ investment intent and upon the accuracy of the representations made in this Article 3. Each Crestwood Party understands that NRGM is relying in part upon the
representations and agreements contained in this Article 3 for the purpose of determining whether the offer, sale and issuance of the New NRGM Common Units meets the requirements for such exemptions. Each Crestwood Party understands that the
New NRGM Common Units will be characterized as “restricted securities” under the Securities Act and that under the Securities Act and applicable regulations, such New NRGM Common Units may not be sold, transferred, offered for sale,
pledged, hypothecated or otherwise disposed of except pursuant to an effective registration statement under the Securities Act or pursuant to an available exemption from the requirements of the Securities Act, and in compliance with other applicable
state and federal securities Laws. In this connection, each Crestwood Party represents that it is familiar with Rule 144 promulgated under the Securities Act, and understands the resale limitations imposed thereby and by the Securities Act. Each
Crestwood Party also acknowledges that appropriate legends will be placed on the certificates representing the New NRGM Common Units to be acquired by the Crestwood Parties pursuant to Article 2 (including as required by the NRGM Partnership
Agreement) indicating the restrictions on transfer of such New NRGM Common Units and that Buyer has no obligation to register such New NRGM Common Units, except as provided in the NRGM Partnership Agreement. 

  
 7 

 ARTICLE 4 
 OTHER COVENANTS 
 4.1 Prohibition on Transfers, Other
Actions. Each of the Crestwood Parties hereby agrees not to (a) Transfer any of the Subject Units (other than pursuant to Article 2 herein, pursuant to the Merger, pursuant to the Follow-On Contribution Agreement or pursuant to a
Permitted Transfer (as defined in the Voting Agreement)); (b) enter into any agreement, arrangement or understanding, or take any other action, that violates or conflicts with or would reasonably be expected to violate or conflict with, or
result in or give rise to a violation of or conflict with, such Crestwood Party’s representations, warranties, covenants and obligations under this Agreement (other than the Merger Agreement and the Voting Agreement); or (c) take any
action that could restrict or otherwise affect such Crestwood Party’s legal power, authority and right to comply with and perform its covenants and obligations under this Agreement. Any Transfer in violation of this Section 4.1
shall be null and void. 
 4.2 Further Assurances. From time to time, at the request of the Inergy Parties and
without further consideration, each of the Crestwood Parties shall execute and deliver, or cause to be executed and delivered, such instruments of assignment, transfer, conveyance, endorsement, direction or authorization as may be necessary, and
take all such further action as may be reasonably necessary or advisable, in each case including as required pursuant to the CMLP Partnership Agreement, to consummate and make effective the transactions contemplated by this Agreement. 

ARTICLE 5 

MISCELLANEOUS 
 5.1 Termination. This Agreement shall remain in effect until the earliest to occur of (a) the Effective Time, (b) the date that is 60 days following the valid termination of the
Merger Agreement, and (c) the mutual written agreement of each of the Crestwood Parties and the Inergy Parties to terminate this Agreement. Upon the occurrence of any such event, this Agreement shall automatically terminate without any notice
or further action from the Parties hereto and be of no further force or effect. Nothing in this Section 5.1 and no termination of this Agreement shall relieve or otherwise limit any Party of liability for any breach of this Agreement
occurring prior to such termination. 
 5.2 Publicity. Each of the Crestwood Parties hereby permits the Inergy
Parties and CMLP to include and disclose in the Proxy Statement/Prospectus and in such other schedules, certificates, applications, agreements or documents as such entities reasonably determine to be necessary or appropriate in connection with the
consummation of the Merger and the transactions contemplated by the Merger Agreement, the identity of each of the Crestwood Parties, the ownership of the Subject Units by each of the Crestwood Parties and the nature of the commitments, arrangements
and understandings of each the Crestwood Parties pursuant to this Agreement. 
 5.3 Notices. Any notice, request,
instruction, correspondence or other document to be given hereunder to a Party shall be in writing and delivered in person or by courier service requiring acknowledgment of receipt of delivery or mailed by U.S. registered or certified mail,

  
 8 

 
postage prepaid and return receipt requested, or by telecopier, as follows; provided, however, that copies to be delivered below shall not be required for effective notice and shall
not constitute notice: 
 If to any of the Inergy Parties, to: 

Inergy Midstream, L.P. 
 Two Brush Creek Boulevard, Suite 200 
 Kansas City, Missouri 64112 

Attention: General Counsel 
 Facsimile: (816) 531-4680 
 and 

Inergy, L.P. 

Two Brush Creek Boulevard, Suite 200 
 Kansas City, Missouri 64112 
 Attention: General Counsel 

Facsimile: (816) 531-4680 
 with a copy to (which copy shall not constitute Notice): 
 Vinson & Elkins LLP

 1001 Fannin, Suite 2500 
 Houston, Texas 
 Attention: Mike Rosenwasser and Gillian A. Hobson 

Facsimile: (713) 615-5794 
 and 
 Conflicts Committee of the Board of Directors 

Inergy Midstream, L.P. 
 Two Brush Creek Boulevard, Suite 200 
 Kansas City, Missouri 64112 

Attention: Randy E. Moeder, Chairman of the Conflicts Committee 
 Facsimile: (405) 286-9192 
 and 

Potter Anderson & Corroon LLP 
 1313 North Market Street 
 P.O. Box 951 

Wilmington, DE 19899-0951 
 Attention: Thomas A. Mullen 
 Facsimile: (302) 778-6204 

  
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 If to any of the Crestwood Parties, to: 

Crestwood Holdings LLC 
 700 Louisiana Street, Suite 2060 
 Houston, Texas 77002 

Attention: Robert G. Phillips 
 Facsimile: 832-519-2250 
 With a copy to (which shall not constitute notice):

 Simpson Thacher & Bartlett LLP 
 425 Lexington Avenue 
 New York, New York 10017 

Attention: William E. Curbow 
 Facsimile: (212) 455-2502 
 Notice given by personal delivery, courier service or mail shall be
effective upon actual receipt. Notice given by telecopier shall be confirmed by appropriate answer back and 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 by telecopier shall be confirmed promptly after transmission in writing by certified mail or personal delivery. Any Party
may change any address to which Notice is to be given to it by giving Notice as provided above of such change of address. 
 5.4
Interpretation. The division of this Agreement into articles, sections and other portions and the insertion of headings are for convenience of reference only and shall not affect the construction or interpretation hereof. Unless
otherwise indicated, all references to an “Article” or “Section” refer to the specified Article or Section of this Agreement. The terms “this Agreement,” “hereof,” “herein” and “hereunder”
and similar expressions refer to this Agreement and not to any particular Article, Section, or other portion hereof. Unless otherwise specifically indicated or the context otherwise requires, (a) words importing the singular shall include the
plural and vice versa and words importing any gender shall include all genders and (b) “include,” “includes” and “including” as used in this Agreement shall be deemed to be followed by the words “without
limitation.” The Parties have participated jointly in the negotiation and drafting of this Agreement. In the event an ambiguity or question of intent or interpretation arises, it is the intention of the Parties that this Agreement shall be
construed as if drafted jointly by the Parties and no presumption or burden of proof shall arise favoring or disfavoring any Person by virtue of the authorship of any of the provisions of this Agreement. 

5.5 Entire Understanding. This Agreement (including the documents referred to or listed herein and the schedules annexed
hereto), the Merger Agreement and the Voting Agreement constitute the entire agreement between and among the Parties pertaining to the subject matter hereof and supersede all prior agreements, understandings, negotiations and discussions, whether
oral or written, of the Parties, and there are no representations, warranties or other agreements between or among the Parties in connection with the subject matter hereof except as set forth specifically herein or contemplated hereby. 

5.6 Successors and Assigns; No Third-Party Beneficiaries. Neither this Agreement nor any of the rights or obligations of
any Party under this Agreement shall be assigned, in whole or in part (by operation of Law or otherwise), by any Party without the prior written consent of the other Parties hereto, except that NRGM may assign the Option without the prior written
consent of the other Parties hereto. Any assignment in violation of this provision shall 

  
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be null and void. Subject to the foregoing, this Agreement shall bind and inure to the benefit of the Parties hereto and their respective successors and permitted assigns. Nothing in this
Agreement, expressed or implied, is intended to confer upon any Person, other than the Parties hereto or their respective successors and permitted assigns, any rights, remedies, obligations or liabilities under or by reason of this Agreement.

 5.7 Counterparts. This Agreement may be executed in multiple counterparts each of which shall be deemed an
original and all of which shall constitute one instrument. Delivery of an executed signature page of this Agreement by facsimile or other customary means of electronic transmission (e.g., “pdf”) shall be effective as delivery of a manually
executed counterpart hereof. 
 5.8 Severability. If any term or other provision of this Agreement is invalid,
illegal or incapable of being enforced by any rule of applicable Law, or public policy, all other conditions and provisions of this Agreement shall nevertheless remain in full force and effect so long as the economic or legal substance of the
transactions contemplated by this Agreement are not affected in any manner materially adverse to any Party. Upon such determination that any term or other provision is invalid, illegal or incapable of being enforced, the Parties shall negotiate in
good faith to modify this Agreement so as to effect the original intent of the Parties as closely as possible in a mutually acceptable manner in order that the transactions contemplated by this Agreement are consummated as originally contemplated to
the fullest extent possible. 
 5.9 Governing Law; Consent to Jurisdiction; Waiver of Jury
Trial.  
 (a) To the maximum extent permitted by applicable Laws, the provisions of this
Agreement shall be governed by and construed and enforced in accordance with the laws of the State of Delaware, without regard to principles of conflicts of law. 
 (b) Each of the Parties irrevocably and unconditionally confirms and agrees that it is and shall continue to be (i) subject to the jurisdiction of the courts of the State of Delaware and of the
federal courts sitting in the State of Delaware and (ii) subject to service of process in the State of Delaware. Each Party hereby irrevocably and unconditionally (A) consents and submits to the exclusive jurisdiction of any federal or
state court located in the State of Delaware, including the Delaware Court of Chancery in and for New Castle County for any actions, suits or proceedings arising out of or relating to this Agreement or the transactions contemplated by this Agreement
(and agrees not to commence any litigation relating thereto except in such courts); (B) waives any objection to the laying of venue of any such litigation in the Delaware Courts and agrees not to plead or claim in any Delaware Court that such
litigation brought therein has been brought in any inconvenient forum; and (C) acknowledges and agrees that any controversy which may arise under this Agreement is likely to involve complicated and difficult issues, and therefore each such
Party hereby irrevocably and unconditionally waives any right such Party may have to a trial by jury in respect of any litigation directly or indirectly arising or relating to this Agreement or the transactions contemplated by this Agreement.

 5.10 No Recourse. This Agreement may only be enforced against, and any claims or causes of action that may be
based upon, arise out of or relate to this Agreement, or the negotiation, execution or performance of this Agreement may only be made against, the entities that are expressly identified as Parties hereto, and no past, present or future Affiliate,
Representative, partner or stockholder of any Party hereto shall have any liability for any obligations or liabilities of the Parties to this Agreement or for any claim based on, in respect of, or by reason of, the transactions contemplated hereby.

  
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 5.11 Remedies. The Parties acknowledge and agree that an award of money
damages would be inadequate for any breach of this Agreement by any Party and any such breach would cause the non-breaching Parties irreparable harm. Accordingly, the Parties agree that prior to the termination of this Agreement, in the event of any
breach or threatened breach of this Agreement by one of the Parties, the Parties shall also be entitled, without the requirement of posting a bond or other security, to equitable relief, including injunctive relief and specific performance. Such
remedies shall not be the exclusive remedies for any breach of this Agreement but shall be in addition to all other remedies available at law or equity to each of the Parties. 
 5.12 Amendment; Waiver. This Agreement may not be amended except by an instrument in writing signed by each of the Parties. The failure of a Party to exercise any right or remedy shall not
be deemed or constitute a waiver of such right or remedy in the future. No waiver of any of the provisions of this Agreement shall be deemed or shall constitute a waiver of any other provision hereof (regardless of whether similar), nor shall any
such waiver constitute a continuing waiver unless otherwise expressly provided. Only actions, waivers or consents by NRGM or NRGM GP with the prior written consent of the Buyer Special Committee shall constitute an action, waiver or consent by
either NRGM or NRGM GP as a party hereto, and the Buyer Special Committee shall be entitled to exercise all rights of the Inergy Parties under this Agreement. Only actions, waivers or consents by CMLP with the prior written consent of the MLP
Conflicts Committee shall constitute an action, waiver or consent by CMLP as a party hereto. 
 5.13 Follow-On
Contribution Agreement. For the avoidance of doubt and notwithstanding anything in this Agreement to the contrary, nothing herein shall limit the ability of the Crestwood Parties from exercising any of their rights under the Follow-On
Contribution Agreement and the Crestwood Parties shall continue to have such rights during the period contemplated by the Follow-On Contribution notwithstanding the receipt of an Exercise Notice, and no Exercise Notice shall apply with respect to
CMLP Common Units so long as such CMLP Common Units are eligible to be contributed pursuant to the Follow-On Contribution Agreement. 
 5.14 Antidilution Protections. If following the date hereof, the outstanding CMLP Common Units, CMLP Class D Units or NRGM Common Units shall be changed into a different number of units or
other securities by reason of any split, reclassification, recapitalization, combination, merger, consolidation, reorganization or other similar transaction or event, or any distribution payable in equity securities shall be declared thereon with a
record date within such period (other than distributions in kind to the Holders of CMLP Class D Units or the holders of the CMLP Incentive Distribution Rights pursuant to the CMLP Partnership Agreement), the number of New Buyer Common Units to be
issued upon exercise of the Option shall be appropriately adjusted to provide to the Crestwood Parties the same economic effect as contemplated by this Agreement prior to such event. 

[Remainder of this page intentionally left blank] 

  
 12 

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

			
	INERGY, L.P.
		
	By:	 	Inergy GP, LLC, its General Partner
		
	By:	 	 /s/ John J. Sherman

	Name:	 	John J. Sherman
	Title:	 	Chief Executive Officer
	
	INERGY MIDSTREAM, L.P.
		
	By:	 	NRGM GP, LLC, its General Partner
		
	By:	 	 /s/ John J. Sherman

	Name:	 	John J. Sherman
	Title:	 	 Chief Executive Officer

	
	NRGM GP, LLC
		
	By:	 	 /s/ John J. Sherman

	Name:	 	John J. Sherman
	Title:	 	Chief Executive Officer
	
	INTREPID MERGER SUB, LLC
		
	By:	 	 /s/ John J. Sherman

	Name:	 	John J. Sherman
	Title:	 	Chief Executive Officer

  
 Signature
Page to Option Agreement 

 
			
	
	CRESTWOOD GAS SERVICES GP LLC
		
	By:	 	 /s/ Robert G. Phillips

	Name:	 	Robert G. Phillips
	Title:	 	President
	
	CRESTWOOD GAS SERVICES HOLDINGS LLC
		
	By:	 	 /s/ Robert G. Phillips

	Name:	 	Robert G. Phillips
	Title:	 	President
	
	CRESTWOOD HOLDINGS LLC
		
	By:	 	 /s/ Robert G. Phillips

	Name:	 	Robert G. Phillips
	Title:	 	President

  
 Signature
Page to Option Agreement 

 SCHEDULE A 

Existing Units 
  

			
	 Name
	  	 Ownership

		
	Crestwood Gas Services GP LLC	  	137,105 Common Units
		
	Crestwood Gas Services Holdings LLC	  	 6,190,469 Class D Units

 
 17,210,377 Common Units

		
	Crestwood Holdings LLC	  	2,333,712 Common Units

 SCHEDULE A 

 EXHIBIT A 
 Form of Assignment and Assumption Agreement 

 ASSIGNMENT AND ASSUMPTION OF LIMITED PARTNER INTERESTS 

This ASSIGNMENT AND ASSUMPTION OF LIMITED PARTNER INTERESTS (this “Assignment”), dated as of [—], is by and between [—], a Delaware limited liability company (“Assignor”), and Inergy Midstream, L.P., a Delaware limited
partnership (“Assignee”). 
 W I T N E S S E T H: 

WHEREAS, Assignee, Assignor, [[Crestwood Gas Services GP LLC, a Delaware limited liability company][Crestwood Gas Services
Holdings LLC, a Delaware limited liability company], and [Crestwood Holdings LLC, a Delaware limited liability
company]]1, have entered into that certain Option
Agreement, dated as of May 5, 2013, as amended (the “Option Agreement”); and 
 WHEREAS,
pursuant to the terms and conditions set forth in the Option Agreement, Assignor agreed to sell, assign and transfer to the Assignee, and the Assignee agreed to acquire from Assignor, all of the limited partner interests of Crestwood Midstream
Partners LP, a Delaware limited partnership (“CMLP”), held by Assignor; 
 WHEREAS, the Assignee
has exercised the Option pursuant to Article 2 of the Option Agreement, and, in connection therewith, desires for Assignor to sell, assign and transfer the CMLP Limited Partner Interests (as such term is hereinafter defined) to Assignee as
further set forth herein; and 
 WHEREAS, capitalized terms used but not defined herein have the respective meanings
given to them in the Option Agreement. 
 NOW, THEREFORE, in consideration of the foregoing, the mutual covenants, terms
and conditions set forth herein, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, Assignor and Assignee agree as follows: 

1. Assignor hereby transfers, grants, conveys, assigns and delivers to Assignee, and Assignee hereby accepts, subject to the terms and
conditions of the CMLP Partnership Agreement, all of Assignor’s right, title and interest in limited partner interests of CMLP, including all rights under the CMLP Partnership Agreement (the “CMLP Limited Partner
Interests”), in each case free and clear of all Encumbrances other than Permitted Encumbrances, and Assignee hereby assumes all of Assignor’s liabilities, duties and obligations with respect to the CMLP Limited Partner Interests.

 2. From and after the date hereof, the Assignee shall be substituted for the Assignor as the holder of the CMLP Limited
Partner Interests and, in compliance with CMLP Partnership Agreement, the Assignee shall be subject to and be bound by all the terms and provisions of the CMLP Partnership Agreement. Notwithstanding any subsequent amendment, supplement or
restatement to the CMLP Partnership Agreement, this Assignment shall remain in full force and effect. 
  

	1 	Insert applicable non-Assignor entities which were parties to the Option Agreement. 

 3. Assignor and Assignee agree to take any further action and deliver any further
assignments, powers, instruments and other documents as may reasonably be necessary or appropriate (whether pursuant to the CMLP Partnership Agreement or otherwise) for the purpose of effecting or confirming, of record or otherwise, the transfer of
the CMLP Limited Partner Interests to Assignee from Assignor as provided herein. 
 4. The terms and provisions of this
Assignment shall be binding upon and inure to the benefit of Assignor and Assignee and their respective legal representatives, successors and assigns. No other person shall have any right, benefit, priority, or interest hereunder or as a result
hereof or have standing to require satisfaction of the provisions hereof in accordance with their terms. 
 5. This Assignment
is made in accordance with and is subject to the terms, covenants and conditions contained in the Option Agreement. The terms and conditions of the Option Agreement are incorporated herein by reference, and in the event of a conflict between the
provisions of the Option Agreement and this Assignment, the provisions of the Option Agreement shall control. Notwithstanding any other provision of this Assignment, this Assignment shall not amend, alter, modify or limit in any manner the rights
and obligations of the parties hereto under the Option Agreement. 
 6. To the maximum extent permitted by applicable Laws, the
provisions of this Assignment shall be governed by and construed and enforced in accordance with the laws of the State of Delaware, without regard to principles of conflicts of law. Each of the parties irrevocably and unconditionally confirms and
agrees that it is and shall continue to be (a) subject to the jurisdiction of the courts of the State of Delaware and of the federal courts sitting in the State of Delaware and (b) subject to service of process in the State of Delaware.
Each party hereby irrevocably and unconditionally (i) consents and submits to the exclusive jurisdiction of any federal or state court located in the State of Delaware, including the Delaware Court of Chancery in and for New Castle County for
any actions, suits or proceedings arising out of or relating to this Assignment or the transactions contemplated by this Assignment (and agrees not to commence any litigation relating thereto except in such courts); (i) waives any objection to
the laying of venue of any such litigation in the Delaware Courts and agrees not to plead or claim in any Delaware Court that such litigation brought therein has been brought in any inconvenient forum; and (i) acknowledges and agrees that any
controversy which may arise under this Assignment is likely to involve complicated and difficult issues, and therefore each such party hereby irrevocably and unconditionally waives any right such party may have to a trial by jury in respect of any
litigation directly or indirectly arising or relating to this Assignment or the transactions contemplated by this Assignment. 

7. No amendment to this Assignment shall be effective unless it shall be in writing and signed by each party hereto. 

8. This Assignment may be executed in multiple counterparts each of which shall be deemed an original and all of which shall constitute
one instrument. Delivery of an executed signature page of this Assignment by facsimile or other customary means of electronic transmission (e.g., “pdf”) shall be effective as delivery of a manually executed counterpart hereof. 

 [Remainder of page intentionally left blank. Signature page follows. ]

 IN WITNESS WHEREOF, the parties hereto have duly executed and delivered this
Assignment and Assumption of Limited Partner Interests as of the day and year first written above. 
  

							
	ASSIGNOR:	  	[—],	 		 	
		  	a Delaware limited liability company	 	
				
		  	By:	 	  
	 	
		  	Name:	 	[—]	 	
		  	Title:	 	[—]	 	
			
	ASSIGNEE:	  	 Inergy Midstream, L.P.,
 a Delaware limited partnership
	 	
				
		  	By:	 	NRGM GP, LLC, its General Partner	 	
				
		  	By:	 	  
	 	
		  	Name:	 	[—]	 	
				
		  	Title:	 	[—]	 	

  
 EXHIBIT A

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