Document:

exv10w10

Exhibit 10.10

EXECUTION

GUARANTY

(PostRock Energy Corporation)

(PostRock Energy Services Corporation)

     THIS GUARANTY (this “Guaranty”), dated as of March 5, 2010, is made by PostRock Energy
Corporation, a Delaware corporation (“Post-Recombination Parent”), and PostRock Energy Services
Corporation, a Nevada corporation, f/k/a Quest Resource Corporation (“Quest Parent”;
Post-Recombination Parent and Quest Parent sometimes herein referred to individually as a
“Guarantor” and collectively as the “Guarantors”), in favor of ROYAL BANK OF CANADA, as
administrative agent for the Lenders (as defined below).

RECITALS:

     A. Pursuant to that certain Amended and Restated Credit Agreement, dated as of November 1,
2007, as amended by a First Amendment to Amended and Restated Credit Agreement dated as of November
1, 2007, Second Amendment to Amended and Restated Credit Agreement dated as of October 28, 2008 and
Third Amendment to Amended and Restated Credit Agreement dated as of December 17, 2009 (as the same
may hereafter be amended, supplemented and restated, the “Credit Agreement”), among Bluestem
Pipeline, LLC, a Delaware limited liability company (“Bluestem”), and Quest Midstream Partners,
L.P., as co-borrowers (“MLP”; Bluestem and MLP, together with their successors and assigns, each a
"Borrower” and collectively the “Borrowers”), the various financial institutions that are, or may
from time to time become, parties thereto (individually a “Lender” and collectively the “Lenders”)
and Royal Bank of Canada, as administrative agent and collateral agent (in its capacity as
administrative agent, the “Administrative Agent”), the Lenders agreed to make Credit Extensions for
the account of the Borrowers.

     B. Pursuant to Section 6.14 of the Credit Agreement, Borrowers are required to deliver to the
Administrative Agent a guaranty executed by the Post-Recombination Parent and Quest Parent.

     C. Each Guarantor has duly authorized the execution, delivery and performance of this
Guaranty.

     D. Quest Parent owns 100% of the equity of PostRock Midstream, LLC, a Delaware limited
liability company, successor by merger to MLP and MLP owns 100% of the equity of Bluestem.

     E. Post-Recombination Parent owns 100% of the equity of Quest Parent.

     F. It is in the best interests of each Guarantor to execute this Guaranty inasmuch as each
Guarantor will derive substantial direct and indirect benefits from the extensions of credit made
from time to time to or for the account of the Borrowers.

     NOW THEREFORE, for good and valuable consideration, the receipt of which is hereby
acknowledged, and in order to fulfill the requirements of the Credit Agreement, the Guarantors
agree, for the benefit of each Lender, as follows:

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ARTICLE I

DEFINITIONS

     SECTION 1.1 Certain Terms. The following capitalized terms when used in this Guaranty,
including its preamble and recitals, shall have the following meanings (such definitions to be
equally applicable to the singular and plural forms thereof):

     “Administrative Agent” is defined in Recital A.

     “Bluestem” is defined in Recital A.

     “Borrower” and “Borrowers” are defined in Recital A.

     “Commitments” means the Aggregate Revolving Commitment (as defined in the Credit Agreement).

     “Credit Agreement” is defined in Recital A.

     “Credit Extensions” means each Credit Extension (as defined in the Credit Agreement).

     “Guarantor” and “Guarantors” is defined in the preamble.

     “Guaranty” is defined in the preamble.

     “Lender” and “Lenders” are defined in the first recital.

     “Loan Documents” means the Loan Documents (as defined in the Credit Agreement).

     “MLP” is defined in Recital A.

     “Note” means each Revolving Note (as defined in the Credit Agreement).

     “Obligations” means the Obligations (as defined in the Credit Agreement).

     “Obligor” means each of the Borrowers or any other Person (other than the Administrative Agent
or any Lender) obligated under any Loan Document.

     “Post-Recombination Parent” is defined in the preamble.

     “Quest Parent” is defined in the preamble.

     “Required Lenders” means the Required Lenders (as defined in the Credit Agreement).

     “Taxes” is defined in clause (a) of Section 2. 7.

     “UCC” means the Uniform Commercial Code as in effect in the State of New York.

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     SECTION 1.2 Credit Agreement Definitions. Unless otherwise defined herein or the
context otherwise requires, capitalized terms used in this Guaranty, including its preamble and
recitals, have the meanings provided in the Credit Agreement,

     SECTION 1.3 UCC Definitions. Unless otherwise defined herein or the context otherwise
requires, terms for which meanings are provided in the UCC are used in this Guaranty, including its
preamble and recitals, with such meanings.

ARTICLE II

GUARANTY PROVISIONS

     SECTION 2.1 Guaranty. Each Guarantor hereby absolutely, unconditionally, and
irrevocably (1) guarantees the full and punctual payment when due, whether at stated maturity, by
required prepayment, declaration, acceleration, demand or otherwise, of all Obligations of the
Borrowers and each other Obligor now or hereafter existing under each of the Credit Agreement, the
Notes and each other Loan Document to which the Borrowers or such other Obligor is or may become a
party, whether for principal, interest, fees, expenses or otherwise (including all such amounts
which would become due but for the operation of the automatic stay under Section 362(a) of the
United States Bankruptcy Code, 11 U.S.C. §362(a), and the operation of Sections 502(b) and 506(b)
of the United States Bankruptcy Code, 11 U.S.C. §502(b) and §506(b)), and (2) indemnifies and holds
harmless each Lender and each holder of a Note for any and all costs and expenses (including
reasonable attorney’s fees and expenses) incurred by such Lender or such holder, as the case may
be, in enforcing any rights under this Guaranty; provided however, that each Guarantor shall be
liable under this Guaranty for the maximum amount of such liability that can be hereby incurred
without rendering this Guaranty, as it relates to such Guarantor, voidable under applicable law
relating to fraudulent conveyance or fraudulent transfer, and not for any greater amount. This
Guaranty constitutes a guaranty of payment when due and not of collection, and each Guarantor
specifically agrees that it shall not be necessary or required that any Lender or any holder of any
Note exercise any right, assert any claim or demand or enforce any remedy whatsoever against the
Borrowers or any other Obligor (or any other Person) before or as a condition to the obligations of
such Guarantor hereunder.

     SECTION 2.2 Acceleration of Guaranty. Each Guarantor agrees that, in the event of the
occurrence of any event of the type described in Section 8.01(f) of the Credit Agreement, with
respect to the Borrowers, any other Obligor or any other Guarantor, and if such event shall occur
at a time when any of the Obligations may not then be due and payable, such Guarantor will pay to
the Lenders forthwith the full amount which would be payable hereunder by such Guarantor if all
such Obligations were then due and payable.

     SECTION 2.3 Guaranty Absolute, etc. This Guaranty shall in all respects be a
continuing, absolute, unconditional and irrevocable guaranty of payment, and shall remain in full
force and effect until all Obligations (other than contingent indemnity obligations) of the
Borrowers and each other Obligor have been paid in full (or, in the case of L/C Obligations, Cash
Collateralized), all obligations of the Guarantors hereunder shall have been paid in full, all
Commitments shall have terminated and, except as provided in Section 10.01(e) of the Credit
Agreement, all Lender Hedging Agreements have terminated. No Guarantor may rescind or revoke its
obligations hereunder. Each Guarantor guarantees that the Obligations of the Borrowers and each
other Obligor will be paid strictly in accordance with the terms of the Credit Agreement and each
other Loan Document under which they arise, regardless of any law, regulation or order now or
hereafter in effect in any jurisdiction affecting any of such terms or the rights of any Lender or
any holder of any Note with respect thereto. The liability of each Guarantor under

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this Guaranty shall be absolute, unconditional and irrevocable irrespective of: (1) any lack
of validity, legality or enforceability of the Credit Agreement, any Note or any other Loan
Document; (2) the failure of any Lender or any holder of any Note (a) to assert any claim or demand
or to enforce any right or remedy against the Borrowers, any other Obligor or any other Person
(including any other guarantor) under the provisions of the Credit Agreement, any Note, any other
Loan Document or otherwise, or (b) to exercise any right or remedy against any other guarantor of,
or collateral securing, any Obligations of the Borrowers or any other Obligor; (3) any change in
the time, manner or place of payment of, or in any other term of, all or any of the Obligations of
the Borrowers or any other Obligor, or any other extension, compromise or renewal of any
Obligations of the Borrowers or any other Obligor; (4) any reduction, limitation, impairment or
termination of any Obligations of the Borrowers or any other Obligor for any reason, including any
claim of waiver, release, surrender, alteration or compromise, and shall not be subject to (and
each Guarantor hereby waives any right to or claim of) any defense or setoff, counterclaim,
recoupment or termination whatsoever by reason of the invalidity, illegality, nongenuineness,
irregularity, compromise, unenforceability of, or any other event or occurrence affecting, any
Obligations of the Borrowers, any other Obligor or otherwise; (5) any amendment to, rescission,
waiver, or other modification of, or any consent to departure from, any of the terms of the Credit
Agreement, any Note or any other Loan Document; (6) any addition, exchange, release, surrender or
non-perfection of any collateral, or any amendment to or waiver or release or addition of, or
consent to departure from, any other guaranty, held by any Lender or any holder of any Note
securing any of the Obligations of the Borrowers or any other Obligor; (7) the insolvency or
bankruptcy of, or similar event affecting, the Borrowers or any other Obligor; or (8) any other
circumstance which might otherwise constitute a defense available to, or a legal or equitable
discharge of, the Borrowers, any other Obligor, any surety or any guarantor. Each Guarantor waives
all rights and defenses which may arise with respect to any of the foregoing, and each Guarantor
waives any right to revoke this Guaranty with respect to future indebtedness.

     SECTION 2.4 Reinstatement. Each Guarantor agrees that this Guaranty shall continue to
be effective or be reinstated, as the case may be, if at any time any payment (in whole or in part)
of any of the Obligations is rescinded or must otherwise be restored by any Lender or any holder of
any Note, upon the insolvency, bankruptcy or reorganization of either Borrower, any other Obligor
or otherwise, all as though such payment had not been made.

     SECTION 2.5 Waiver, etc. The Guarantors hereby waive promptness, diligence, notice
of acceptance and any other notice with respect to any of the Obligations of the Borrowers or any
other Obligor and this Guaranty and any requirement that the Administrative Agent, any other Lender
or any holder of any Note protect, secure, perfect or insure any security interest or Lien, or any
property subject thereto, or exhaust any right or take any action against the Borrowers, any other
Obligor or any other Person (including any other guarantor) or entity or any collateral securing
the Obligations of the Borrowers or any other Obligor, as the case may be.

     SECTION 2.6 Waiver of Subrogation. Until the Obligations are paid in full, all
Commitments have terminated and all Lender Hedging Agreements have terminated (except as provided
in Section 10.01(e) of the Credit Agreement), the Guarantors shall not enforce or exercise any
claim or other rights which they may now or hereafter acquire against the Borrowers or any other
Obligor that arise from the existence, payment, performance or enforcement of any Guarantor’s
obligations under this Guaranty or any other Loan Document, including any right of subrogation,
reimbursement, exoneration, or indemnification, any right to participate in any claim or remedy of
the Lenders against the Borrowers or any other Obligor or any collateral which the Administrative
Agent now has or hereafter acquires, whether or not such claim, remedy or right arises in equity,
or under contract, statute or common law,

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including the right to take or receive from the Borrowers or any other Obligor, directly or
indirectly, in cash or other property or by set-off or in any manner, payment or security on
account of such claim or other rights. If any amount shall be paid to any Guarantor in violation of
the preceding sentence, such amount shall be deemed to have been paid to such Guarantor for the
benefit of, and held in trust for, the Lenders, and shall forthwith be paid to the Administrative
Agent for the benefit of the Lenders by the Guarantor receiving such payment to be credited and
applied upon the Obligations, whether matured or unmatured. Each Guarantor acknowledges that it
will receive direct and indirect benefits from the financing arrangements contemplated by the
Credit Agreement and that the waiver set forth in this Section is knowingly made in contemplation
of such benefits.

     SECTION 2.7 Payments Free and Clear of Taxes, etc. Each Guarantor hereby agrees
that:

     (a) All payments by such Guarantor hereunder shall be made in accordance with Section 3.01 of
the Credit Agreement free and clear of and without deduction for any and all present or future
taxes, duties, levies, imposts, deductions, assessments, fees, withholdings or similar charges, and
all liabilities with respect thereto; excluding, in the case of the Administrative Agent and each
Lender, taxes imposed on or measured by its net income (including any franchise taxes imposed on or
measured by its net income), by the jurisdiction (or any political subdivision thereof) under the
Laws of which the Administrative Agent or such Lender, as the case may be, is organized or
maintains its Lending Office (all such non-excluded taxes, duties, levies, imposts, deductions,
assessments, fees, withholdings or similar charges, and liabilities being hereinafter referred to
as “Taxes”). In the event that any withholding or deduction from any payment to be made by such
Guarantor hereunder is required in respect of any Taxes pursuant to any applicable law, rule or
regulation, then such Guarantor will (i) pay directly to the relevant authority the full amount
required to be so withheld or deducted; (ii) promptly forward to such Lender an official receipt or
other documentation satisfactory to such Lender evidencing such payment to such authority; and
(iii) pay to such Lender such additional amount or amounts as is necessary to ensure that the net
amount actually received by such Lender will equal the full amount such Lender would have received
had no such withholding or deduction been required. Moreover, if any Taxes are directly asserted
against any Lender with respect to any payment received by such Lender hereunder, such Lender may
pay such Taxes and such Guarantor will promptly pay such additional amounts (including, if incurred
as a result of such Guarantor’s or the Borrowers’ action, omission or delay, any penalties,
interest or expenses) as is necessary in order that the net amount received by such Lender after
the payment of such Taxes (including any Taxes on such additional amount) shall equal the amount
such Lender would have received had such Taxes not been asserted.

     (b) If a Guarantor fails to pay any Taxes when due to the appropriate taxing authority or
fails to remit to any Lender the required receipts or other required documentary evidence, such
Guarantor shall indemnify such Lender for any incremental Taxes, interest or penalties that may
become payable by such Lender as a result of any such failure.

     (c) Without prejudice to the survival of any other agreement of the Guarantors hereunder, the
agreements and obligations of the Guarantors contained in this Section 2.7 shall survive the
payment in full of the principal of and interest on the Revolving Loan.

     SECTION 2.8 Subordination. Each Guarantor hereby subordinates and makes inferior to
the Obligations any and all indebtedness now or at any time hereafter owed by the Borrowers or
other Obligor to such Guarantor. Each Guarantor agrees that if any Event of Default has occurred
and is continuing under the Credit Agreement, it will not permit the Borrowers to repay such
indebtedness or any part thereof and it will not accept payment from the Borrowers of such
indebtedness or any part thereof without the prior written consent of the Required Lenders. If a
Guarantor receives any such

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payment without the prior required written consent, the amount so paid shall be held in trust
for the benefit of the Lenders, shall be segregated from the other funds of such Guarantor, and
shall forthwith be paid over to the Administrative Agent to be held by the Administrative Agent as
collateral for, or then or at any time thereafter applied in whole or in part by the Administrative
Agent against, all or any portions of the Obligations, whether matured or unmatured, in such order
as the Administrative Agent shall elect.

ARTICLE III

MISCELLANEOUS PROVISIONS

     SECTION 3.1 Loan Document. This Guaranty is a Loan Document executed pursuant to the
Credit Agreement and shall (unless otherwise expressly indicated herein) be construed, administered
and applied in accordance with the terms and provisions thereof.

     SECTION 3.2 Releases. At such time as the Revolving Loan shall have been paid in full
(other than contingent indemnity obligations and, with respect to L/C Obligations, if they have
been Cash Collateralized), the Commitments have been terminated, and, subject to Section 10.01(e)
of the Credit Agreement, no Lender Hedging Agreements are outstanding, the Administrative Agent
shall, at the request and expense of the Guarantors following such termination, promptly execute
and deliver to the Guarantors such documents and instruments as the Guarantors shall reasonably
request to evidence termination and release of this Guaranty.

     SECTION 3.3 Administrative Agent and Lenders; Successors and Assigns.

     (a) The Administrative Agent is Administrative Agent for each Lender under the Credit
Agreement. All rights granted to Administrative Agent under or in connection with this Guaranty are
for each Lender’s ratable benefit. The Administrative Agent may, without the joinder of any Lender,
exercise any rights in Administrative Agent’s or Lenders’ favor under or in connection with this
Guaranty. The Administrative Agent’s and each Lender’s rights and obligations vis-a-vis each other
may be subject to one or more separate agreements between those parties. However, the Guarantors
are not required to inquire about any such agreement and are not subject to any terms of it unless
the Guarantors specifically enter into such agreement. Therefore, neither Guarantors nor any of
their successors or assigns are entitled to any benefits or provisions of any such separate
agreement nor are they entitled to rely upon or raise as a defense any party’s failure or refusal
to comply with the provisions of any such agreement.

     (b) This Guaranty benefits the Administrative Agent, the Lenders, and their respective
successors and assigns and binds each Guarantor and its successors and assigns. Upon appointment of
any successor Administrative Agent under the Credit Agreement, all of the rights of Administrative
Agent under this Guaranty automatically vest in that new Administrative Agent as successor
Administrative Agent on behalf of Lenders without any further act, deed, conveyance, or other
formality other than that appointment. The rights of the Administrative Agent and the Lenders under
this Guaranty may be transferred with any assignment of the obligations hereby guaranteed pursuant
to and in accordance with the terms of the Credit Agreement. The Credit Agreement contains
provisions governing assignments of the obligations guaranteed under this Guaranty.

     SECTION 3.4 Amendments, etc. No amendment to or waiver of any provision of this
Guaranty, nor consent to any departure by any Guarantor herefrom, shall in any event be effective
unless the same shall be in writing and signed by or on behalf of the party against whom it is
sought to be enforced and is in conformity with the requirements of Section 10.01 of the Credit
Agreement. Each such

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waiver or consent shall be effective only in the specific instance and for the specific
purpose for which given.

     SECTION 3.5 Addresses for Notices to the Guarantors. All notices and other
communications hereunder to the Guarantors shall be in writing and mailed or delivered to it,
addressed to it at the address set forth below or at such other address as shall be designated by
the Guarantor in a written notice to the Administrative Agent at the address specified in the
Credit Agreement complying as to delivery with the terms of this Section. All such notices and
other communications shall, when mailed, be effective when deposited in the mail, addressed as
aforesaid. Address for notices:

210 Park Avenue, Suite 2750

Oklahoma City, Oklahoma 73102

Attn: General Counsel

Facsimile: (405) 702-7490

Telephone: (405) 600-7704

     SECTION 3.6 No Waiver; Remedies. In addition to, and not in limitation of, Section 2.3
and Section 2.5, no failure on the part of any Lender or any holder of a Note to exercise, and no
delay in exercising, any right hereunder shall operate as a waiver thereof, nor shall any single or
partial exercise of any right hereunder preclude any other or further exercise thereof or the
exercise of any other right. The remedies herein provided are cumulative and not exclusive of any
remedies provided by law.

     SECTION 3.7 Section Captions. Section captions used in this Guaranty are for
convenience of reference only, and shall not affect the construction of this Guaranty.

     SECTION 3.8 Setoff. In addition to, and not in limitation of, any rights of any
Lender or any holder of a Note under applicable law, upon the occurrence and during the continuance
of an Event of Default under or as defined in the Credit Agreement, each Lender and each such
holder shall be entitled to exercise (for the benefit of all Lenders pursuant to Section 10.09 of
the Credit Agreement) any right of offset or banker’s lien against each and every account and other
property or interest that a Guarantor may now or hereafter have with, or which is now or hereafter
in the possession of, any such Lender, to the extent of the full amount of the Obligations.

     SECTION 3.9 Severability. Wherever possible, each provision of this Guaranty shall be
interpreted in such manner as to be effective and valid under applicable law, but if any provision
of this Guaranty shall be prohibited by or invalid under such law, such provision shall be
ineffective to the extent of such prohibition or invalidity, without invalidating the remainder of
such provision or the remaining provisions of this Guaranty.

     SECTION 3.10 Governing Law.

     (a) THIS GUARANTY SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAW OF THE STATE
OF NEW YORK APPLICABLE TO AGREEMENTS MADE AND TO BE PERFORMED ENTIRELY WITHIN SUCH STATE;
PROVIDED THAT THE ADMINISTRATIVE AGENT AND EACH LENDER SHALL RETAIN ALL RIGHTS ARISING
UNDER UNITED STATES FEDERAL LAW.

     (b) EACH GUARANTOR AGREES ANY LEGAL ACTION OR PROCEEDING WITH RESPECT TO THIS GUARANTY OR ANY
OTHER LOAN DOCUMENT MAY BE BROUGHT IN

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THE COURTS OF THE STATE OF NEW YORK SITTING IN THE BOROUGH OF NEW YORK OR OF THE UNITED STATES
FOR THE SOUTHERN DISTRICT OF NEW YORK AND APPELLATE COURTS FROM ANY THEREOF, AND BY EXECUTION AND
DELIVERY OF THIS GUARANTY, EACH GUARANTOR CONSENTS, FOR ITSELF AND IN RESPECT OF ITS PROPERTY, TO
THE NON-EXCLUSIVE JURISDICTION OF THOSE COURTS. EACH GUARANTOR (1) IRREVOCABLY WAIVES ANY
OBJECTION, INCLUDING ANY OBJECTION TO THE LAYING OF VENUE OR BASED ON THE GROUNDS OF FORUM NON
CONVENIENS, WHICH IT MAY NOW OR HEREAFTER HAVE TO THE BRINGING OF ANY ACTION OR PROCEEDING IN SUCH
JURISDICTION IN RESPECT OF ANY LOAN DOCUMENT OR OTHER DOCUMENT RELATED THERETO, AND (2) IRREVOCABLY
CONSENTS TO THE SERVICE OF PROCESS OUT OF ANY OF THE AFOREMENTIONED COURTS IN ANY SUCH ACTION OR
PROCEEDING BY THE MAILING OF COPIES THEREOF BY CERTIFIED MAIL, RETURN RECEIPT REQUESTED, POSTAGE
PREPAID, AT ITS ADDRESS FOR NOTICES DESIGNATED HEREIN. EACH GUARANTOR WAIVES PERSONAL SERVICE OF
ANY SUMMONS, COMPLAINT OR OTHER PROCESS, WHICH MAY BE MADE BY ANY OTHER MEANS PERMITTED BY THE LAW
OF SUCH STATE.

     SECTION 3.11 Waiver of Jury Trial, Etc. EACH GUARANTOR HEREBY (a) EXPRESSLY AND
IRREVOCABLY WAIVES ANY RIGHT TO TRIAL BY JURY OF ANY CLAIM, DEMAND, ACTION OR CAUSE OF ACTION
ARISING UNDER ANY LOAN DOCUMENT OR IN ANY WAY CONNECTED WITH OR RELATED OR INCIDENTAL TO THE
DEALINGS OF THE PARTIES TO THE LOAN DOCUMENTS OR ANY OF THEM WITH RESPECT TO ANY LOAN DOCUMENT, OR
THE TRANSACTIONS RELATED THERETO, IN EACH CASE WHETHER NOW EXISTING OR HEREAFTER ARISING, AND
WHETHER FOUNDED IN CONTRACT OR TORT OR OTHERWISE; AND EACH GUARANTOR HEREBY AGREES AND CONSENTS
THAT ANY SUCH CLAIM, DEMAND, ACTION OR CAUSE OF ACTION SHALL BE DECIDED BY COURT TRIAL WITHOUT A
JURY, AND THAT ADMINISTRATIVE AGENT OR ANY LENDER MAY FILE AN ORIGINAL COUNTERPART OR A COPY OF
THIS SECTION WITH ANY COURT AS WRITTEN EVIDENCE OF THE CONSENT OF EACH GUARANTOR TO THE WAIVER OF
ITS RIGHT TO TRIAL BY JURY; AND (b) EXPRESSLY AND IRREVOCABLY WAIVES, TO THE MAXIMUM EXTENT NOT
PROHIBITED BY LAW, ANY RIGHT IT MAY HAVE TO CLAIM OR RECOVER IN ANY SUCH ACTION ANY SPECIAL,
EXEMPLARY, PUNITIVE OR CONSEQUENTIAL DAMAGES, OR DAMAGES OTHER THAN, OR IN ADDITION TO, ACTUAL
DAMAGES; PROVIDED THAT THE WAIVER CONTAINED IN THIS SECTION 3.11 SHALL NOT APPLY TO THE EXTENT THAT
THE PARTY AGAINST WHOM DAMAGES ARE SOUGHT HAS ENGAGED IN GROSS NEGLIGENCE OR WILLFUL MISCONDUCT.

     SECTION 3.12 Entire Agreement. THIS GUARANTY AND THE OTHER LOAN DOCUMENTS REPRESENT
THE FINAL AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR,
CONTEMPORANEOUS, OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL
AGREEMENTS BETWEEN THE PARTIES.

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SIGNATRUES BEGIN ON NEXT PAGE.]

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     IN WITNESS WHEREOF, each Guarantor has caused this Guaranty to be duly executed and delivered
by an officer duly authorized as of the date first above written.

	 	 	 	 	 
	 	POSTROCK ENERGY CORPORATION,

a Delaware corporation,

as Guarantor

 	 
	 	By:  	/s/ David C. Lawler
 	 
	 	 	David C. Lawler 	 
	 	 	Chief Executive Officer and President 	 
	 
	 	POSTROCK ENERGY SERVICES CORPORATION,

a Nevada corporation,

as Guarantor

 	 
	 	By:  	/s/ David C. Lawler
 	 
	 	 	David C. Lawler 	 
	 	 	Chief Executive Officer and President 	 
	 

Signature Page

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Exhibit 10.11

ASSIGNMENT AND AMENDMENT AGREEMENT

          This ASSIGNMENT AND AMENDMENT AGREEMENT (this “Agreement”), by and among Quest Resource
Corporation (“QRC”), PostRock Energy Corporation (“PostRock”), and David Lawler (“Employee”),
effective as of the date of the consummation of the transactions contemplated by the Agreement and
Plan of Merger dated July 2, 2009, among PostRock, QRC, Quest Midstream Partners, L.P., QuestEnergy
Partners, L.P., Quest Midstream GP, LLC, Quest Energy GP, LLC, Quest Resource Acquisition Corp.,
Quest Energy Acquisition, LLC, and Quest Midstream Acquisition, LLC, as amended (the “Effective
Date”) (such transactions collectively, the “Recombination”), is an amendment to, and assignment
of, that certain Employment Agreement by and between QRC and Employee dated April 10, 2007 and
thereafter amended (the “Employment Agreement”).

RECITALS

          WHEREAS, QRC and Employee have previously entered into the Employment Agreement to provide for
terms and conditions of Employee’s employment by QRC;

          WHEREAS, in connection with the Recombination, QRC shall be a wholly-owned subsidiary of
PostRock and shall be renamed PostRock Energy Service Corporation;

          WHEREAS, QRC, PostRock and Employee desire that Employee should continue to be employed by
PostRock on substantially the same terms as currently provided in the Employment Agreement;

          WHEREAS, QRC, PostRock, and Employee desire to assign the Employment Agreement to PostRock and
desire to amend the Employment Agreement to reflect such assignment.

          NOW, THEREFORE, the parties hereby agree to amend and assign the Employment Agreement,
effective as of the Effective Date, as follows:

 

 

I. ASSIGNMENT

          QRC hereby assigns to PostRock, and PostRock hereby assumes, all rights, obligations and
liabilities of QRC under the Employment Agreement, and Employee acknowledges and consents to such
assignment and assumption.

II. AMENDMENTS

          1. The Recital in the Employment Agreement is hereby amended to replace the phrase “QUEST
RESOURCE CORPORATION (the ‘Company’)” with “POSTROCK ENERGY CORPORATION (the ‘Company’).”

          2. The second sentence of Section 1(a) of the Employment Agreement is hereby amended to read
as follows:

     “Employee will serve as Chief Executive Officer and President of the Company.”

          3. Section 1(b) of the Employment Agreement is hereby amended to read as follows:

     “b. Duties. Employee agrees that so long as he is employed pursuant to
this Agreement, he will: (i) to the satisfaction of the Company, devote his best
efforts and his entire business time to further properly the interests of the
Company and its subsidiaries (together, the ‘Company Group’); (ii) at all times be
subject to the direction and control of the Board of Directors of the Company with
respect to his activities on behalf of the Company Group; (iii) comply with all
rules, orders and regulations of the Company and all statutes, regulations,
interpretive rulings and other enactments to which the Company is subject; (iv)
truthfully and accurately maintain and preserve such records and make all reports as
the Company may require; and (v) fully account for all Company Group monies which he
may from time to time have custody over and deliver the same to the Company whenever
and however directed to do so.”

          4. The second and third sentences of Section 2(b) of the Employment Agreement are hereby
amended to read as follows:

“Employee’s actual bonus level will be contingent upon the achievement of
predetermined financial results and the Board’s (and/or Compensation Committee’s)
approval thereof, including approval of any components based on the Company, the
Company Group or individual performance. Employee acknowledges that actual payouts
under the plan may be more or less than Employee’s target level based on performance
as compared to Company Group, Company and Employee’s individual objectives.”

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          5. Clause (iv) of the second sentence of Section 5(b) of the Employment Agreement is hereby
amended to read as follows:

“(iv) Employee no longer being the Chief Executive Officer and President of the
Company;”

          6. QRC, PostRock and Employee hereby acknowledge and agree that none of the consummation of
the transactions in the Recombination or the actions contemplated thereby nor the assignment of the
Employment Agreement constitutes “Good Reason” under the Employment Agreement.

          7. All references to “the Company” in the second, fourth and sixth clauses of the third
sentence of Section 6(b) (which is incorrectly labeled 6(a)) of the Employment Agreement are hereby
amended to refer to “the Company Group.”

          8. Section 6 of the Employment Agreement is hereby amended by adding a new subsection (d)
thereto which shall read as follows:

     “d. Employee’s Separation from Service. For the avoidance of doubt,
termination of employment for purposes of this Agreement shall not be deemed to
have occurred until Employee has terminated employment with the Company and all
members of the Company Group, for so long as such entities are considered a single
service recipient for purposes of determining whether a ‘separation from service’
has occurred under § 409A.”

          9. The address of the Company in Section 7 of the Employment Agreement is hereby amended to
read as follows:

PostRock Energy Corporation

210 Park Avenue, Suite 2750

Oklahoma City, Oklahoma 73102

Attention: Chairman of the Board of Directors

Facsimile: (405) 488-1156

          10. All references to “the Company” in Section 8 (Company Property), Section 9 (Intellectual
Property), Section 14 (Conflicts of Interest), Section 15 (Confidentiality; Restrictive Covenants)
of the Employment Agreement are hereby amended to refer to “the Company Group.”

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          11. Section 23 of the Employment Agreement is hereby amended to be Section 25, and all
subsequent sections are renumbered and the references thereto are hereby amended accordingly, and
the Employment Agreement is hereby amended by adding the following new Section 23 and Section 24
thereto which shall read as follows:

     “23. Release. Employee shall forfeit the Severance Pay, pro rata
bonus, and reimbursement of COBRA insurance premiums described in Section 5(b) and
Section 6(a) hereof if he has not signed and returned to the Company an agreement
containing a release of claims against the Company, in a form substantially similar
to that included in Exhibit A, attached hereto and incorporated herein, within
twenty-one (21) days following the date of Employee’s termination of employment with
the Company, without subsequent revocation of the release during the seven-day
period following his execution of the release. In addition, Employee shall forfeit
all unpaid Severance Pay, pro rata bonus, and reimbursement of COBRA insurance
premiums described in the applicable of Section 5(b) or Section 6(a) immediately on
the first date the Board determines, in its sole discretion, that Employee has
violated or threatened to violate Section 15.

     24. Section 409A. It is the intent of the parties that the benefits
under this Agreement comply with or be exempt from § 409A and the Treasury
regulations and guidance issued thereunder. Accordingly, the parties intend that
the provisions of this Agreement be interpreted and operated consistent with such
requirements of § 409A in order to avoid the application of additive taxes under §
409A to the extent reasonably practicable. Notwithstanding any provision of this
Agreement to the contrary, this Agreement shall not be amended in any manner that
would cause: (i) this Agreement or any amounts or benefits payable hereunder to fail
to comply with the requirements of § 409A, to the extent applicable; or (ii) any
amounts or benefits payable hereunder that are not subject to § 409A to become
subject thereto (unless they also are in compliance therewith), and the provisions
of any purported amendment that may reasonably be expected to result in such
non-compliance shall be of no force or effect with respect to this Agreement.

     If Employee is a ‘Specified Employee’ (as defined under § 409A) as of the date
of his ‘Separation from Service’ (as defined under § 409A) as determined by the
Company, and any stock of the Company is publicly traded on an established
securities market or otherwise, the payment of any amount under this Agreement on
account of his Separation from Service that is deferred compensation subject to the
provisions of § 409A and not otherwise excluded from § 409A, shall not be paid until
the later of the first business day that is six months after the date after
Employee’s Separation from Service or the date the payment is otherwise payable
under this Agreement (the ‘Delay Period’). Upon the expiration of the Delay Period,
all payments and benefits delayed pursuant to this Section 24 (whether they would
have otherwise been payable in a single sum or in installments in the absence of
such delay) shall be paid or reimbursed to Employee in a lump sum, without interest,

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and any remaining payments due under this Agreement shall be paid or provided
in accordance with the normal payment dates specified for them herein.

     All reimbursements and in-kind benefits provided pursuant to this Agreement
shall be made in accordance with Treasury Regulation Section 1.409A-3(i)(1)(iv) such
that any reimbursements or in-kind benefits will be deemed payable at a specified
time or on a fixed schedule relative to a permissible payment event. Specifically,
(i) the amounts reimbursed and in-kind benefits provided under this Agreement, other
than with respect to medical benefits, during Employee’s taxable year may not affect
the amounts reimbursed or in-kind benefits provided in any other taxable year, (ii)
the reimbursement of an eligible expense shall be made on or before the last day of
Employee’s taxable year following the taxable year in which the expense was
incurred, and (iii) the right to reimbursement or an in-kind benefit is not subject
to liquidation or exchange for another benefit.”

     12. Except as amended and assigned above, the Employment Agreement remains in full force and
effect.

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          IN WITNESS WHEREOF, Quest Resource Corporation and PostRock Energy Corporation have caused
this Agreement to be executed by their duly authorized officers and Employee has signed this
Agreement, on March 5, 2010, but effective as of the Effective Date.

	 	 	 	 	 	 	 
	 	 	QUEST RESOURCE CORPORATION	 	 
	 
	 	 	 	 	 	 
	 

	 	By:
	 	/s/ David Lawler	 	 
	 

	 	Name:
	 	 

David Lawler
	 	 
	 

	 	Title:
	 	President and Chief Executive Officer	 	 
	 
	 	 	 	 	 	 
	 	 	POSTROCK ENERGY CORPORATION	 	 
	 
	 	 	 	 	 	 
	 

	 	By:
	 	/s/ Gary Pittman	 	 
	 

	 	 	 	 	 	 
	 

	 	Name:
	 	Gary Pittman	 	 
	 

	 	Title:
	 	Chairman of the Board	 	 
	 
	 	 	 	 	 	 
	 	 	EMPLOYEE	 	 
	 
	 	 	 	 	 	 
	 	 	/s/ David Lawler
	 	 
	 	 	 	 	 
	 	 	David Lawler	 	 

Signature page to Lawler Employment Agreement Amendment

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